JP7324938B2 - Intake purification device - Google Patents

Description

The present invention relates to an intake air purification device.

2. Description of the Related Art Conventionally, there is known an intake air purifying device that includes an air cleaner box whose interior is partitioned into a dirty side and a clean side by an air cleaner element, and an intake duct that introduces outside air into the dirty side as intake air (see, for example, Patent Document 1). In a saddle type vehicle, the intake purification device has various shapes and locations depending on the type of vehicle.

WO2019/142279

By the way, the intake air purifying device sucks in the intake air from the upstream end of the intake duct, but it is difficult for the intake air to be drawn into the intake duct around the upstream end due to the influence of running wind and the effects of parts arranged around it. can be. For example, when an intake purification device is installed in a saddle-riding type vehicle, if the intake efficiency decreases, the response of the engine will be delayed especially in the low speed range of the engine, and the drivability will be impaired.
SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide an intake purifying device that facilitates intake of intake air into an intake duct and improves intake efficiency.

This specification includes all the contents of Japanese Patent Application/Japanese Patent Application No. 2020-064278 filed on March 31, 2020.
The intake purification device is an air cleaner whose interior is partitioned into dirty sides (47D, 247D, 347D, 447D) and clean sides (47C, 247C, 347C, 447C) by air cleaner elements (37, 237, 337, 437). An intake purification device comprising a box (35, 235, 335, 435) and an intake duct (38, 238, 338, 438) for introducing outside air into the dirty side (47D, 247D, 347D, 447D) as intake air, Outside the air cleaner box (35, 235, 335, 435) and upstream of the intake duct (38, 238, 338, 438), the intake air is supplied upstream of the intake duct (38, 238, 338, 438). An intake duct upstream guide member (40, 240, 340, 440) is provided to guide the duct inlet (38b, 238b, 338b, 438b) of the side end (38a, 238a, 338a, 438a), and the intake duct upstream The side guide members (40, 240, 340, 440) are composed of concavely curved duct upstream guide surfaces (52, 252, 352, 452) and the duct upstream guide surfaces (52, 252, 352, 452). a guide inlet opening (53, 253, 353, 453) that is an opening in the concave curved surface, the guide inlet opening (53, 253, 353, 453) being the duct inlet (38b, 238b, 338b, 438b).

Further, in the above configuration, the guide entrance opening (53, 253, 353, 453) may open in a direction facing the duct entrance (38b, 238b, 338b, 438b).
Further, in the above configuration, the intake purification device may be mounted on a vehicle, and the guide inlet opening (53, 253, 353, 453) may open toward the front of the vehicle.

Furthermore, in the above configuration, the guide inlet opening (53, 253, 353) is aligned with the axis (38e, 238e) of the upstream end (38a, 238a, 338a) of the intake duct (38, 238, 338). , 338e) so as to overlap the upstream end (38a, 238a, 338a) of the intake duct (38, 238, 338).
Further, in the above configuration, the intake duct upstream guide member (340, 440) has a cut portion around the guide entrance opening (353, 453) in the intake duct upstream guide member (340, 440). A notched guide entry opening (375, 475) may be provided.

Further, in the above configuration, the intake duct upstream guide member (440) may be fixed to the intake duct (438).
Further, in the above configuration, the intake duct upstream guide member (340) may be fixed to the body frame of the vehicle or an exterior component (344) of the vehicle.

The intake purification device includes an air cleaner box whose interior is partitioned into a dirty side and a clean side by an air cleaner element, and an intake duct that introduces outside air into the dirty side as intake air. On the upstream side, an intake duct upstream guide member for guiding intake air to the duct entrance at the upstream end of the intake duct is provided. a guide inlet opening that is an opening in the concave surface of the upstream guide surface, the guide inlet opening being larger than the duct inlet.
According to this configuration, the intake air enters the intake duct upstream guide member through the guide entrance opening larger than the duct entrance of the intake duct, is guided by the concavely curved duct upstream guide surface, and is guided by the duct entrance of the intake duct. flow to Therefore, the air intake duct upstream guide member facilitates the intake of air into the air intake duct, thereby improving the air intake efficiency.

Further, in the above configuration, the guide inlet opening may open in a direction facing the duct inlet.
According to this configuration, since the guide inlet opening faces the duct inlet, the intake air flowing from the guide inlet opening to the concavely curved upstream guide surface of the duct can efficiently flow to the duct inlet. .
Further, in the above configuration, the intake air purification device may be mounted on the vehicle, and the guide entrance opening may open toward the front of the vehicle.
According to this configuration, the running wind of the vehicle running ahead can be efficiently taken into the guide surface on the upstream side of the duct from the guide entrance opening that opens toward the front of the vehicle, and the intake air can efficiently flow through the intake duct. can.

Furthermore, in the configuration described above, the guide inlet opening may overlap the upstream end of the air intake duct in the axial direction of the axis of the upstream end of the air intake duct.
According to this configuration, since the guide entrance opening overlaps the upstream end of the intake duct, the flow of intake air around the upstream end can be stabilized, and the intake efficiency can be improved.
Further, in the above configuration, the intake duct upstream guide member may have a notched guide entrance opening formed by cutting out a portion surrounding the guide entrance opening in the intake duct upstream guide member.
According to this configuration, the intake air can be taken into the upstream side guide member of the intake duct from the notch guide inlet opening, and the amount of intake air can be increased.

Further, in the above configuration, the intake duct upstream guide member may be fixed to the intake duct.
According to this configuration, the assembly error of the intake duct upstream guide member to the intake duct can be reduced, and the intake duct upstream guide member can be fixed at the correct position.
Further, in the above configuration, the intake duct upstream guide member may be fixed to the body frame of the vehicle or an exterior component of the vehicle.
According to this configuration, the vehicle body frame and the exterior parts of the vehicle can support the large intake duct upstream guide member, so that the degree of freedom in the shape of the intake duct upstream guide member can be increased.

FIG. 1 is a left side view of the motorcycle according to the first embodiment of the invention. FIG. 2 is a left side view of the front portion of the motorcycle with the body cover removed. FIG. 3 is a side cross-sectional view of the front portion of the motorcycle cut at the center of the vehicle width. FIG. 4 is a perspective view of the intake air purification device as seen from the rear side. FIG. 5 is a cross-sectional view taken along line VV of FIG. FIG. 6 is a left side view of the motorcycle according to the second embodiment. 7 is a cross-sectional view taken along line VII-VII of FIG. 6. FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8. FIG. 10 is a cross-sectional view taken along the line XX of FIG. 9. FIG. FIG. 11 is a side view of the connecting pipe upstream guide member viewed from the air cleaner element side. FIG. 12 is a left side view of the motorcycle according to the third embodiment. FIG. 13 is a cross-sectional view of the motorcycle. FIG. 14 is a perspective view of the periphery of the air cleaner box viewed from above with the seat removed. FIG. 15 is a top plan view of the intake duct and the periphery of the intake duct upstream guide member. FIG. 16 is a sectional view of the motorcycle in the fourth embodiment. FIG. 17 is a perspective view of the air intake duct and the periphery of the air intake duct upstream guide member as viewed from above with the seat removed. FIG. 18 is a left side view of the motorcycle according to the fifth embodiment. 19 is a cross-sectional view taken along line XIX-XIX of FIG. 18. FIG. FIG. 20 is a left side view of the motorcycle according to the sixth embodiment. 21 is a cross-sectional view taken along line XXI-XXI of FIG. 20. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, directions such as front, rear, left, right, and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and LH indicates the left side of the vehicle body.

[First embodiment]
FIG. 1 is a left side view of a motorcycle 1 according to the first embodiment of the invention.
The motorcycle 1 has an engine 11 as a power unit supported on a body frame 10 , a front fork 12 steerably supporting a front wheel 2 steerably supported at the front end of the body frame 10 , and a swing arm supporting a rear wheel 3 . A vehicle 13 is provided on the rear side of the vehicle body frame 10 .
The motorcycle 1 is a saddle type vehicle in which a rider straddles a seat 14 , and the seat 14 is provided above the rear portion of the vehicle body frame 10 .
The motorcycle 1 includes a vehicle body cover 15 that covers the vehicle body including the vehicle body frame 10 and the engine 11 .

FIG. 2 is a left side view of the front portion of the motorcycle 1 with the body cover 15 removed.
1 and 2, the body frame 10 includes a head pipe 17 provided at the front end of the body frame 10, a pair of left and right main frames 18 extending rearward and downward from the head pipe 17, and and a connected rear frame (not shown).

The engine 11 includes a crankcase 21 that supports a crankshaft 20 that extends in the vehicle width direction, and a cylinder portion 22 that extends from the front surface of the crankcase 21 toward the front of the vehicle.
The cylinder portion 22 includes a cylinder 22a that houses a piston (not shown) that reciprocates back and forth, a cylinder head 22b that is connected to the front surface of the cylinder 22a, and a head cover 22c that covers the front surface of the cylinder head 22b.
The engine 11 is a horizontal engine in which the axis 22d of the cylinder 22a extends substantially horizontally in the longitudinal direction of the vehicle when viewed from the side of the vehicle.

The engine 11 is supported by the body frame 10 and arranged below the main frame 18 in front of the rear frame. The cylinder portion 22 extends back and forth under the main frame 18 .
An intake device 25 that supplies intake air to the engine 11 is arranged above the cylinder portion 22 .
An exhaust pipe 26 of the engine 11 extends rearward from the lower surface of the cylinder head 22b.

A steering handle 27 is provided at the upper end of the front fork 12 .
The front wheel 2 is supported by the lower ends of the front forks 12 . A front fender 28 is attached to the front fork 12 .

The swing arm 13 is supported by the vehicle body frame 10 via a pivot shaft (not shown) inserted through the front end. The rear wheel 3 is supported by the rear end of the swing arm 13 .
A rear suspension 29 is stretched between the rear portion of the swing arm 13 and the rear portion of the vehicle body.

FIG. 3 is a side cross-sectional view of the front portion of the motorcycle 1 cut at the center of the width of the vehicle.
2 and 3, the intake device 25 includes an intake purification device 30, a throttle body 31 that adjusts the flow rate of intake air, and a tubular insulator 32 that connects the throttle body 31 to an intake port on the upper surface of the cylinder head 22b. and

The intake air purification device 30 includes an air cleaner box 35, a partition wall 36 that partitions the inside of the air cleaner box 35, an air cleaner element 37 provided in the partition wall 36, an intake duct 38 that takes in the air into the air cleaner box 35, and an air cleaner box. 35 to the throttle body 31;

The air cleaner box 35 is a box-shaped member that is arranged between the left and right main frames 18 and is arranged behind the front fender 28 and above the cylinder portion 22 .
The air cleaner box 35 includes a box-shaped portion 41 in which the air cleaner element 37 is arranged, and a bulging portion 42 that bulges upward from the front portion of the box-shaped portion 41 . The inside of the box-shaped portion 41 and the inside of the bulging portion 42 communicate with each other.

The air cleaner box 35 includes a box-shaped air cleaner case 45 whose front surface opens forward, and a case cover 46 which closes the open portion of the front surface of the air cleaner case 45 . Case cover 46 is coupled to front edge portion 45 a of air cleaner case 45 .
The box-shaped portion 41 and the bulging portion 42 are composed of an air cleaner case 45 and a case cover 46, respectively.

The partition wall 36 closes the front open portion of the air cleaner case 45 in the box-shaped portion 41, and divides the inside of the air cleaner box 35 into a dirty side 47D on the upstream side of the air cleaner element 37 and a dirty side 47D on the downstream side of the air cleaner element 37. and a clean side 47C. The partition wall 36 is a plate-like member arranged with its plate thickness direction directed in the vehicle width front-rear direction.

The air cleaner element 37 is a filter that collects dust contained in intake air. The air cleaner element 37 is a plate-like member arranged with its plate thickness direction oriented in the vehicle width front-rear direction, and is supported by the partition wall 36 . The air cleaner element 37 has a substantially rectangular shape when viewed from the front of the vehicle. The air cleaner element 37 is disposed tilted forward with respect to the vertical direction when viewed from the side of the vehicle.
The air cleaner element 37 is positioned at the front inside the air cleaner box 35 .

The dirty side 47</b>D is a room through which intake air flows before passing through the air cleaner element 37 and is formed between the case cover 46 and the partition wall 36 . A dirty side 47</b>D is provided in the front portion of the air cleaner box 35 . The inside of the bulging portion 42 is the dirty side 47D.
The clean side 47</b>C is a chamber in which the intake air after being purified by passing through the air cleaner element 37 flows, and is formed between the partition wall 36 and the air cleaner case 45 . The clean side 47C is located behind the dirty side 47D.

The air cleaner element 37 has an element inlet surface 37a exposed to the dirty side 47D and an element outlet surface 37b opposite to the element inlet surface 37a and exposed to the clean side 47C. The element entrance surface 37a and the element exit surface 37b are flat surfaces and substantially parallel to each other.
Intake air flows into the air cleaner element 37 from the element inlet surface 37a of the dirty side 47D and flows from the element outlet surface 37b to the clean side 47C.

A bulging portion 42 of the air cleaner box 35 is positioned above the air cleaner element 37 . The air intake duct 38 extends rearward outside the air cleaner box 35 from the rear surface portion of the bulging portion 42 and communicates the dirty side 47</b>D with the space outside the air cleaner box 35 .
The intake duct 38 is arranged above the air cleaner element 37 and the clean side 47C. The intake duct 38 extends rearward above the upper surface 41 a of the box-shaped portion 41 . The air intake duct 38 extends rearwardly upward along an upper surface 41a that is inclined rearwardly upward (frontwardly downward) when viewed from the side of the vehicle.
The intake duct 38 is a tube with a substantially circular cross section. The intake duct 38 extends straight in a direction substantially perpendicular to the element inlet surface 37a.

The rear end of the intake duct 38 is an upstream end 38a of the intake duct 38 in the flow of intake air. The intake duct 38 takes in outside air as intake from a duct entrance 38b on the rear end face of the upstream end 38a.
The front end of the intake duct 38 is the downstream end 38c of the intake duct 38 in the flow of intake air. The downstream end portion 38 c is connected to the rear surface portion of the bulging portion 42 . A duct outlet 38d on the front end face of the downstream end 38c substantially faces the front wall 46a of the case cover 46 from behind and opens to the top of the dirty side 47D.

The connection pipe 39 extends from the inside of the clean side 47</b>C through the rear portion of the lower surface 41 b of the box-shaped portion 41 and extends downward outside the air cleaner box 35 to be connected to the throttle body 31 .
An opening 39a at the upstream end of the connection pipe 39 in the flow of intake air substantially faces the element outlet surface 37b from the rear and opens toward the front of the vehicle.

FIG. 4 is a perspective view of the intake air purification device 30 as seen from the rear side. FIG. 5 is a cross-sectional view taken along line VV of FIG. In FIG. 5, the vehicle body cover 15 is illustrated.
2 to 5, the intake duct upstream guide member 40 is arranged upstream of the upstream end 38a of the intake duct 38 in the flow of intake air and behind the upstream end 38a. The intake duct upstream guide member 40 is attached to the upper surface 41a of the box-shaped portion 41 and positioned above the clean side 47C.

The intake duct upstream guide member 40 includes a guide portion 50 that guides intake air toward the duct inlet 38b of the upstream end portion 38a, and an attachment portion 51 that is attached to the air cleaner box 35. As shown in FIG.

The guide part 50 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spherical body in half.
The cup-shaped inner surface of the guide portion 50 is a concave curved duct upstream guide surface 52 . A guide entrance opening 53 that is an opening in the concavely curved surface of the duct upstream guide surface 52 exposes the duct upstream guide surface 52 to the outside in the cup shape of the guide portion 50 .

A peripheral edge portion 52a of the duct upstream guide surface 52 that defines the guide entrance opening 53 is substantially circular. The guide entrance opening 53 is generally circular.
The apex 52b of the concave curved surface of the duct upstream guide surface 52 is positioned at the bottom of the inner surface of the cup-shaped guide portion 50. As shown in FIG. The inner diameter of the duct upstream guide surface 52 increases from the vertex 52b toward the guide entrance opening 53 side.

The intake duct upstream guide member 40 is arranged upright so that the guide entrance opening 53 of the guide portion 50 faces the front of the vehicle.
The attachment portion 51 protrudes outward from the outer periphery of the guide portion 50 at the lower end portion of the guide portion 50 .
The intake duct upstream guide member 40 is fixed to the upper portion of the air cleaner case 45 by a fixture 54 that is inserted through the mounting portion 51 from behind.

The intake duct upstream guide member 40 is arranged such that the guide entrance opening 53 of the guide portion 50 faces the duct entrance 38 b of the upstream end 38 a of the intake duct 38 . The guide inlet opening 53 opens toward the front side of the vehicle. More specifically, the guide inlet opening 53 is slightly inclined forward when viewed from the side of the vehicle, and opens forward and downward.
The inner diameter D1 of the guide inlet opening 53 of the guide portion 50 is larger than the inner diameter D2 of the duct inlet 38b of the intake duct 38 and the outer diameter of the upstream end 38a.

The intake duct 38 has a duct entrance 38 b entirely located inside the concave curved surface of the duct upstream guide surface 52 , and the duct entrance 38 b opens inside the duct upstream guide surface 52 . In other words, the duct inlet 38b is located on the rear side of the guide inlet opening 53 and on the bottom side of the cup shape.
A space is provided in the axial direction of the intake duct 38 between the cup-shaped bottom portion of the duct upstream guide surface 52 and the duct inlet 38b.

The cup-shaped axis 52c of the duct upstream guide surface 52 and the axis 38e of the intake duct 38 are substantially parallel and substantially overlap each other. Further, the duct entrance 38b overlaps the duct upstream guide surface 52 when viewed in the axial direction of the axis 38e. The axis 52c and the axis 38e are inclined forward and downward when viewed from the side of the vehicle. A lower portion of the duct upstream guide surface 52 and below the axis 52c of the duct upstream guide surface 52 is inclined forward and downward.
As shown in FIG. 5 , when viewed in the axial direction of the air intake duct 38 , the duct entrance 38 b of the air intake duct 38 overlaps the vertex 52 b of the duct upstream guide surface 52 .

The duct upstream guide surface 52 covers the upstream end 38a of the air intake duct 38 positioned inside the concave curved surface of the duct upstream guide surface 52 from the periphery and rear side of the upstream end 38a. That is, the guide inlet opening 53 of the duct upstream guide surface 52 overlaps the upstream end 38a from the outer peripheral side in the axial direction of the axis 38e of the upstream end 38a. The upstream end portion 38 a and the duct upstream guide surface 52 are continuous in the intake air flow direction of the intake duct 38 .
Here, the axial direction of the axis 38 e is the flow direction of intake air in the intake duct 38 .

The guide portion 50 and the intake duct 38 are arranged between the left and right main frames 18 . As viewed from the side of the vehicle, the main frame 18 overlaps the guide portion 50 and the intake duct 38 from the outside in the vehicle width direction.

The flow of intake air in the intake device 25 will be described.
Referring to FIG. 3 , outside air flows as intake air W from the guide inlet opening 53 on the front surface of the intake duct upstream guide member 40 into the concave surface of the duct upstream guide surface 52 . Intake air W flows from the guide entrance opening 53 side along the duct upstream guide surface 52 toward the apex 52b side, and then turns forward near the apex 52b to reach the duct entrance of the upstream end 38a of the intake duct 38. 38b.
Here, since the guide inlet opening 53 of the intake duct upstream guide member 40 is open to the front of the vehicle, the running wind when the motorcycle 1 travels forward flows directly into the guide inlet opening 53 . For this reason, the running wind can be efficiently taken in from the guide entrance opening 53 to the duct upstream side guide surface 52 as the intake air W.
In addition, since the inner diameter D1 of the guide inlet opening 53 of the intake duct upstream guide member 40 is larger than the inner diameter D2 of the duct inlet 38b of the intake duct 38, the intake air W is collected by the intake duct upstream guide member 40, and this collected The intake air W can be supplied to the duct inlet 38b, and the intake air W can be efficiently flown through the intake duct 38. - 特許庁

The duct inlet 38b of the air intake duct 38 is positioned inside the concave surface of the duct upstream guide surface 52, and the duct inlet 38b and the duct upstream guide surface 52 are continuous in the axial direction of the air intake duct 38. . Therefore, the intake air W guided by the duct upstream guide surface 52 can efficiently flow to the duct entrance 38b.
Furthermore, as shown in FIG. 5, when viewed in the axial direction of the air intake duct 38, the duct entrance 38b of the air intake duct 38 overlaps the vertex 52b of the duct upstream guide surface 52, so it is folded forward from the vicinity of the vertex 52b. Intake air W can be efficiently flowed to the duct entrance 38b.

Intake air W flowing into the air intake duct 38 from the duct entrance 38b flows into the upper part of the dirty side 47D from the duct exit 38d at the front end of the air intake duct 38, flows downward inside the dirty side 47D, and passes through the element entrance surface 37a to the air cleaner element. Flow into 37.
Here, an intake guide portion may be provided at a position facing the duct outlet 38d at the front end of the intake duct 38 in the dirty side 47D to guide the intake air W so as to flow downward. This air intake guide portion may be formed, for example, by forming a convex curved surface on the front wall portion 46a of the case cover 46 so as to face the duct outlet 38d.

Intake air W that has flowed into the air cleaner element 37 flows into the clean side 47C from the element outlet surface 37b, and flows into the connecting pipe 39 from the opening 39a. Intake air W of the connection pipe 39 flows through the throttle body 31 and the insulator 32 to the intake port on the upper surface of the cylinder head 22b.

As described above, according to the first embodiment to which the present invention is applied, the intake purification device 30 includes the air cleaner box 35 whose interior is divided into the dirty side 47D and the clean side 47C by the air cleaner element 37. and an air intake duct 38 for introducing outside air into the dirty side 47D as intake air. The intake duct upstream guide member 40 is provided with a concave curved duct upstream guide surface 52 and an opening in the concave curved surface of the duct upstream guide surface 52. an inlet opening 53, the guide inlet opening 53 being larger than the duct inlet 38b.
According to this configuration, the intake air enters the intake duct upstream guide member 40 through the guide entrance opening 53 larger than the duct entrance 38b of the intake duct 38, and is guided by the concavely curved duct upstream guide surface 52. It flows into the duct inlet 38b of the intake duct 38. Therefore, the air intake duct upstream guide member 40 facilitates the intake of air into the air intake duct 38, thereby improving the air intake efficiency.

Further, the guide entrance opening 53 opens in a direction facing the duct entrance 38b.
According to this configuration, since the guide inlet opening 53 opens in a direction facing the duct inlet 38b, the intake air flowing from the guide inlet opening 53 to the concavely curved duct upstream guide surface 52 is efficiently transferred to the duct inlet 38b. can flow to
The intake air purification device 30 is mounted on the motorcycle 1, and the guide inlet opening 53 opens toward the front of the vehicle.
According to this configuration, the running wind of the motorcycle 1 running forward can be efficiently taken into the duct upstream side guide surface 52 from the guide entrance opening 53 that opens toward the front of the vehicle, and the air intake duct 38 can draw air. can flow efficiently.

Further, the guide inlet opening 53 overlaps the upstream end 38a of the intake duct 38 in the axial direction of the axis 38e at the upstream end 38a of the intake duct 38 .
According to this configuration, the guide inlet opening 53 overlaps the upstream end 38a of the intake duct 38, so that the flow of intake air around the upstream end 38a can be stabilized and the intake efficiency can be improved.

The above-described first embodiment shows one mode to which the present invention is applied, and the present invention is not limited to the above-described first embodiment.
In the first embodiment, the guide member 60 is described as having a hollow hemispherical shape.
Also, the guide member may have a parabolic shape. In this case, the directivity of the intake air to the duct entrance 38b can be strengthened by the guide surface formed by the paraboloid.
Furthermore, in the first embodiment, the duct entrance 38b of the air intake duct 38 is located inside the concavely curved surface of the duct upstream guide surface 52, and the duct entrance 38b and the duct upstream guide surface 52 Although described as continuous in the axial direction of 38, the present invention is not limited to this. For example, even if the duct inlet 38b and the guide inlet opening 53 are separated from each other in the axial direction of the air intake duct 38 by positioning the duct inlet 38b on the outside (front side) of the concave curved surface of the duct upstream guide surface 52, good.
In addition, in the above-described first embodiment, the intake purification device 30 mounted on the motorcycle 1 was described as an example, but the present invention is not limited to this, and the present invention may be applied to the front wheel or the rear wheel. It can be applied to a three-wheel straddle-type vehicle with two wheels, a straddle-type vehicle with four or more wheels, and various devices with an internal combustion engine.

[Second embodiment]
A second embodiment to which the present invention is applied will be described below with reference to FIGS. 6 to 11. FIG.
The second embodiment describes a motorcycle 201 that is different from the motorcycle 1 of the first embodiment.

FIG. 6 is a left side view of motorcycle 201 in the second embodiment.
A motorcycle 201 has an engine 211 as a power unit supported on a body frame 210 , a front fork 212 supporting a front wheel 202 in a steerable manner, and a swing arm supporting a rear wheel 203 . A vehicle 213 is provided on the rear side of the vehicle body frame 210 .
The motorcycle 201 is a saddle type vehicle in which a rider straddles a seat 214 , and the seat 214 is provided above the rear portion of the body frame 210 .
The motorcycle 201 includes a pair of left and right side covers 215 that cover the vehicle body such as the vehicle body frame 210 .

The body frame 210 includes a head pipe 217 provided at the front end of the body frame 210, one main frame 218 extending rearward and downward from the head pipe 217, and a pivot frame 219 extending downward from the rear end of the main frame 218. .

The engine 211 includes a crankcase 221 supporting a crankshaft 220 extending in the vehicle width direction, and a cylinder portion 222 extending forward of the vehicle from the front surface of the crankcase 221 .
The cylinder portion 222 includes a cylinder 222a that houses a piston (not shown) that reciprocates back and forth, a cylinder head 222b that is connected to the front surface of the cylinder 222a, and a head cover 222c that covers the front surface of the cylinder head 222b.
The engine 211 is a horizontal engine in which the axis 222d of the cylinder 222a extends substantially horizontally in the vehicle front-rear direction when viewed from the side of the vehicle.

The engine 211 is supported by the body frame 210 and arranged in front of the pivot frame 219 and below the main frame 218 . The cylinder portion 222 extends back and forth under the main frame 218 .
An intake device 225 that supplies intake air to the engine 211 is arranged above the cylinder portion 222 .
An exhaust pipe 226 of the engine 211 extends rearward from the lower surface of the cylinder head 222b.

A steering handle 227 is provided at the upper end of the front fork 212 .
The front wheel 202 is supported by the lower ends of the front forks 212 . A front fender 228 is attached to the front fork 212 .

The swing arm 213 is supported by the vehicle body frame 210 via a pivot shaft 213a inserted through its front end. Rear wheel 203 is supported by the rear end of swing arm 213 .
A rear suspension 229 is spanned between the rear portion of the swing arm 213 and the rear portion of the vehicle body.
Fuel tank 223 is provided above main frame 218 and between head pipe 217 and seat 214 .

7 is a cross-sectional view taken along line VII-VII of FIG. 6. FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG.
7 and 8, the intake device 225 includes an intake purification device 230, a throttle body 231 that adjusts the flow rate of intake air, and a tubular insulator 232 that connects the throttle body 231 to an intake port on the upper surface of the cylinder head 222b. and

The intake air purifying device 230 includes an air cleaner box 235, a partition wall 236 that partitions the inside of the air cleaner box 235, an air cleaner element 237 that is provided in the partition wall 236, an intake duct 238 that takes intake air into the air cleaner box 235, and an air cleaner box. 235 to the throttle body 231;
Further, the intake air purification device 230 includes an intake duct upstream guide member 240 that guides intake air to the intake duct 238 on the upstream side of the intake duct 238, and an intake duct that guides the intake air to the air cleaner element 237 on the downstream side of the intake duct 238. A downstream guide member 265 and a connection pipe upstream guide member 270 that guides intake air to the connection pipe 239 on the upstream side of the connection pipe 239 are provided.
The intake air purification device 230 is covered from the outside by left and right side covers 215 .

The air cleaner box 235 is arranged below the main frame 218 and above the cylinder portion 222 and positioned between the main frame 218 and the cylinder portion 222 . The air cleaner box 235 is a box-shaped member extending in the vehicle width direction across the main frame 218 located in the center of the vehicle width.

The air cleaner box 235 includes a box-shaped air cleaner case 245 with one of its left and right sides (left side) open outward in the vehicle width direction, and a case cover 246 that closes the opening of the side of the air cleaner case 245 . . Case cover 246 is coupled to peripheral edge portion 245 a of the opening of air cleaner case 245 .

The partition wall 236 is a plate-like member arranged with its plate thickness direction oriented in the vehicle width direction, and partitions the inside of the air cleaner box 235 in the vehicle width direction.
The partition wall 236 partitions the inside of the air cleaner box 235 into a dirty side 247D on the upstream side of the air cleaner element 237 and a clean side 247C on the downstream side of the air cleaner element 237 .
The partition wall 236 is sandwiched between mating surfaces of the air cleaner case 245 and the case cover 246 .

The air cleaner element 237 is a filter that collects dust contained in intake air. The air cleaner element 237 is a plate-like member arranged with its plate thickness direction oriented in the vehicle width direction, and is supported by the partition wall 236 . The air cleaner element 237 has a substantially rectangular shape when viewed from the side of the vehicle.
The air cleaner element 237 and the partition wall 236 are arranged closer to one of the left and right sides (left side) in the air cleaner box 235 so that the clean side 247C has a larger capacity than the dirty side 247D.

The dirty side 247D is a room through which intake air flows before passing through the air cleaner element 237, and is formed between the case cover 246 and the partition wall 236. As shown in FIG.
The clean side 247</b>C is a chamber through which the intake air after being cleaned by passing through the air cleaner element 237 flows, and is formed between the partition wall 236 and the air cleaner case 245 .
The dirty side 247D and the clean side 247C are arranged side by side in the vehicle width direction.

The air cleaner element 237 has an element inlet surface 237a exposed on the dirty side 247D and an element outlet surface 237b opposite to the element inlet surface 237a and exposed on the clean side 247C. The element entrance surface 237a and the element exit surface 237b are flat surfaces and substantially parallel to each other.
Intake air flows into the air cleaner element 237 from the element inlet surface 237a of the dirty side 247D and flows from the element outlet surface 237b to the clean side 247C.

The air intake duct 238 extends rearward outside the air cleaner box 235 from the rear surface of the case cover 246 and communicates the dirty side 247</b>D with the space outside the air cleaner box 235 .
The intake duct 238 is a pipe having a substantially circular cross section and extends in the vehicle front-rear direction within the dirty side 247D. The intake duct 238 is arranged outside the element entrance surface 237a in the vehicle width direction within the dirty side 247D and extends in the vehicle front-rear direction substantially parallel to the element entrance surface 237a along the element entrance surface 237a.

The rear end of the intake duct 238 is an upstream end 238a of the intake duct 238 in the flow of intake air. The intake duct 238 takes in outside air as intake air from a duct inlet 238b on the rear end surface of the upstream end 238a.
The front end of the intake duct 238 is the downstream end 238c of the intake duct 238 in the flow of intake air. A duct outlet 238d on the front end surface of the downstream end portion 238c opens toward the front of the vehicle.
The duct outlet 238d is positioned to overlap the element inlet surface 237a from the outside in the vehicle width direction when viewed from the side of the vehicle.

The connecting pipe 239 extends outside the air cleaner box 235 through the rear surface 245b of the air cleaner case 245 from inside the clean side 247C. A connection pipe 239 extending outward from the air cleaner box 235 extends downward and inward in the vehicle width direction and is connected to the throttle body 231 below the air cleaner box 235 .

The front end of the connection pipe 239 is an upstream end 239a of the connection pipe 239 in the flow of intake air. The upstream end 239a extends in the vehicle front-rear direction within the clean side 247C. An axis 239b of the connection pipe 239 extends in the vehicle front-rear direction within the clean side 247C.
Intake air in the clean side 247C flows into the connecting pipe 239 from a connecting pipe inlet 239c on the front end face of the upstream end portion 239a. The connection pipe inlet 239c substantially faces the front surface 245c of the air cleaner case 245 from behind.

The upstream end 239a is provided in the clean side 247C on the side opposite to the element exit surface 237b in the vehicle width direction. The air cleaner element 237 is positioned on one of the left and right sides of the main frame 218 , and the connecting pipe 239 is positioned on the other left and right side of the main frame 218 .

The intake duct upstream guide member 240 is arranged upstream of the upstream end 238a of the intake duct 238 in the flow of intake air and behind the upstream end 238a. The intake duct upstream guide member 240 and the intake duct 238 are covered from the outside by the side cover 215 .
The intake duct upstream guide member 240 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spherical body in half.
The cup-shaped inner surface of the intake duct upstream guide member 240 is a concave curved duct upstream guide surface 252 . A guide inlet opening 253 that is an opening in the concave curved surface of the duct upstream guide surface 252 exposes the duct upstream guide surface 252 to the outside in the cup shape of the intake duct upstream guide member 240 .

A peripheral edge portion 252a of the duct upstream guide surface 252 that defines the guide entrance opening 253 is substantially circular. The guide entrance opening 253 is generally circular.
The apex 252b of the concave curved surface of the duct upstream guide surface 252 is located at the bottom of the cup-shaped inner surface of the intake duct upstream guide member 240. As shown in FIG. The inner diameter of the duct upstream guide surface 252 increases from the vertex 252b toward the guide entrance opening 253 side.

The intake duct upstream guide member 240 is arranged upright so that the guide entrance opening 253 faces the front of the vehicle.
The air intake duct upstream guide member 240 is oriented such that the guide entrance opening 253 faces the duct entrance 238 b of the upstream end 238 a of the air intake duct 238 . The guide entrance opening 253 opens toward the front side of the vehicle.
The inner diameter of the guide entrance opening 253 of the intake duct upstream guide member 240 is larger than the inner diameter of the duct entrance 238b of the intake duct 238 and the outer diameter of the upstream end 238a.

The intake duct 238 has a duct inlet 238b that is entirely positioned inside the concavely curved surface of the duct upstream guide surface 252, and the duct inlet 238b opens inside the duct upstream guide surface 252. As shown in FIG. In other words, the duct inlet 238b is located on the rear side of the guide inlet opening 253 and on the bottom side of the cup shape.
A space is provided in the axial direction of the intake duct 238 between the cup-shaped bottom portion of the duct upstream guide surface 252 and the duct entrance 238b.

Referring to FIG. 8, an axis 238e of intake duct 238 extends in the longitudinal direction of the vehicle. When viewed in the axial direction of the air intake duct 238 , the duct entrance 238 b of the air intake duct 238 overlaps the vertex 252 b of the duct upstream guide surface 252 .

The duct upstream guide surface 252 covers the upstream end 238a of the air intake duct 238 located inside the concave curved surface of the duct upstream guide surface 252 from the periphery and rear side of the upstream end 238a. That is, the guide inlet opening 253 of the duct upstream guide surface 252 overlaps the upstream end 238a from the outer peripheral side in the axial direction of the axis 238e of the upstream end 238a. The upstream end portion 238 a and the duct upstream guide surface 252 are continuous in the intake air flow direction of the intake duct 238 .
Here, the axial direction of the axis 238 e is the flow direction of intake air in the intake duct 238 .

The intake duct downstream guide member 265 is arranged downstream of the downstream end 238c of the intake duct 238 in the dirty side 247D and in front of the downstream end 238c.
The intake duct downstream side guide member 265 has a cup shape obtained by cutting a hollow spherical body at an outlet opening surface 265a into a hemispherical shape, and is further cut at an inlet opening surface 265b substantially orthogonal to the outlet opening surface 265a. is a cup-shaped member.

The intake duct downstream side guide member 265 is arranged with an outlet opening surface 265a, which is a cup-shaped opening surface, directed toward the element inlet surface 237a. When viewed from the side of the vehicle, the exit opening surface 265a overlaps the element entrance surface 237a.
The downstream end 238c of the air intake duct 238 is inserted into the inlet opening surface 265b of the air intake duct downstream guide member 265 from behind, and the duct outlet 238d is at least partially opened within the air intake duct downstream guide member 265. do.

The cup-shaped inner surface of the intake duct downstream guide member 265 is a guide surface 265c that guides intake air toward the element inlet surface 237a. The guide surface 265c is a recessed curved surface in which the cup-shaped inner surface is recessed in the opposite direction to the element inlet surface 237a with respect to the outlet opening surface 265a. The guide surface 265c is inclined so as to approach the element inlet surface 237a as the distance from the duct outlet 238d increases in the direction in which the intake air blows out from the duct outlet 238d.

9 is a cross-sectional view taken along line IX-IX of FIG. 8. FIG. 10 is a cross-sectional view taken along the line XX of FIG. 9. FIG. FIG. 11 is a side view of the connecting pipe upstream guide member 270 viewed from the air cleaner element 237 side.
7 and 9 to 11, the connecting pipe upstream guide member 270 is located upstream of the upstream end 239a of the connecting pipe 239 in the clean side 247C and in front of the upstream end 239a. placed.

The connecting pipe upstream guide member 270 is shaped like a hemispherical cup shape obtained by cutting a hollow spherical body at a guide opening 270a and further cutting it at an outlet opening 270b substantially orthogonal to the guide opening 270a. is a cup-shaped member. The connection pipe upstream guide member 270 has a shape obtained by bending a flat plate into a cup shape, and the connection pipe upstream guide member 270 is plate-shaped.
The connection pipe upstream side guide member 270 is arranged with the guide opening 270a, which is a cup-shaped opening surface, directed toward the element outlet surface 237b.

The cup-shaped inner surface of the connecting pipe upstream guide member 270 is a connecting pipe upstream guide surface 271 that guides the intake air toward the connecting pipe inlet 239 c of the connecting pipe 239 . The connection pipe upstream guide surface 271 is a concave curved surface in which the cup-shaped inner surface is concave in the opposite direction to the element outlet surface 237b with the guide opening 270a as a reference.
The guide opening 270a exposes the connecting pipe upstream guide surface 271 to the element exit surface 237b side.

The outlet opening 270b is an opening surface formed by cutting out a part of the cup-shaped side surface.
The outlet opening 270b is provided at the rear portion of the connecting pipe upstream guide member 270 and opens rearward in the top view of FIG.

The connection pipe upstream guide member 270 is arranged such that the guide opening 270a is separated from the element outlet surface 237b by a predetermined distance in the vehicle width direction. Further, the guide opening 270a is arranged along the element exit surface 237b, and the guide opening 270a and the element exit surface 237b are substantially parallel.
The concave bottom portion 271a of the connecting pipe upstream guide surface 271 when the guide opening 270a is used as a reference is on the side opposite to the element exit surface 237b with respect to the guide opening 270a. The bottom portion 271a is a portion of the connecting pipe upstream guide surface 271 located farthest from the element outlet surface 237b. The inner diameter of the connection pipe upstream guide surface 271 increases from the bottom 271a toward the guide opening 270a.
The bottom portion 271a is located on the cup-shaped bottom surface of the connecting pipe upstream guide member 270, and the guide opening portion 270a faces this bottom surface.

Referring to FIG. 9, a tangent line 270d located at an end portion 270c that defines the guide opening 270a in a tangent line to the connecting pipe upstream guide surface 271 of the connecting pipe upstream guide member 270 is directed to the element outlet surface 237b, It intersects the element exit face 237b. Tangent line 270d intersects element exit face 237b wherever it is located on edge 270c. That is, the tangent line 270d intersects the element outlet surface 237b over the entire circumference of the end portion 270c. At least a portion of the tangent line 270d located at the end portion 270c should be oriented toward the element outlet surface 237b.

When the connection pipe upstream guide member 270 is viewed in a direction perpendicular to the element outlet surface 237b, the guide opening 270a overlaps the element outlet surface 237b. In the second embodiment, the entire guide opening 270a overlaps the element outlet surface 237b, but at least a portion of the guide opening 270a may overlap the element outlet surface 237b.

The rear portion of the connecting pipe upstream guide member 270 is arranged outside the upstream end 239a of the connecting pipe 239 in the vehicle width direction, and covers the upstream end 239a from the side opposite to the element outlet surface 237b.
The upstream end 239a of the connecting pipe 239 enters the connecting pipe upstream guide surface 271 from the outlet opening 270b, and the connecting pipe inlet 239c of the upstream end 239a is inside the connecting pipe upstream guide surface 271. Open forward.
At least a portion of the connecting pipe inlet 239c is arranged inside the connecting pipe upstream guide surface 271 with respect to the guide opening 270a. Also, the connection pipe inlet 239c is located in the upper and lower middle portion of the connection pipe upstream guide surface 271 .

The rear part of the connecting pipe upstream guide surface 271 overlaps the upstream end 239a from the outer peripheral side in the axial direction of the connecting pipe 239, and covers the upstream end 239a from the surroundings.
That is, the connecting pipe upstream guide surface 271 and the upstream end portion 239 a of the connecting pipe 239 are continuous in the axial direction of the connecting pipe 239 .

Further, referring to FIG. 9, with respect to the distance L1 between the center 239d of the connecting pipe inlet 239c of the connecting pipe 239 and the element outlet surface 237b, the concave bottom portion 271a of the connecting pipe upstream guide surface 271 and the element outlet surface 237b is larger. That is, the connecting pipe upstream guide surface 271 is offset from the connecting pipe inlet 239c of the connecting pipe 239 on the side opposite to the element outlet surface 237b.

A front portion 271b of the connection pipe upstream guide surface 271 is curved toward the element exit surface 237b side toward the front side when viewed from above in FIG.
When the connecting pipe inlet 239c is viewed in the axial direction of the connecting pipe 239, the front portion 271b of the connecting pipe upstream guide surface 271 overlaps the connecting pipe inlet 239c from the front, and at least a portion of the connecting pipe inlet 239c is positioned upstream. cover from

When viewed in the axial direction of the connecting pipe 239, the inner diameter of the connecting pipe upstream guide surface 271 is larger than the diameter of the inner circumference of the connecting pipe inlet 239c of the connecting pipe 239, that is, the inner diameter of the connecting pipe inlet 239c.
The upstream end portion 239a is surrounded from above, from outside in the vehicle width direction, and from below by a connecting pipe upstream guide surface 271 having a diameter larger than that of the upstream end portion 239a.
Further, the connecting pipe upstream guide member 270 is a part manufactured in a separate process from that of the connecting pipe 239 . Therefore, the connection pipe 239 can be formed in a simple shape, and the connection pipe upstream guide member 270 can be easily formed to have a larger diameter than the connection pipe 239 .

The connection pipe upstream guide member 270 includes a fixing hole 272 penetrating the connection pipe upstream guide surface 271 in the vehicle width direction. The fixing hole portion 272 is provided near the bottom portion 271a.
Of the side walls of the air cleaner case 245, a side wall 245d located outside in the vehicle width direction with respect to the connecting pipe 239 has an engaging portion 273 protruding into the clean side 247C.
The connecting pipe upstream guide member 270 is fixed to the air cleaner case 245 by engaging the engaging portion 273 with the fixing hole portion 272 .
The connection pipe upstream guide member 270 also has a flange portion 274 extending downward from the outer periphery of the connection pipe upstream guide surface 271 and engages the air cleaner case 245 via the flange portion 274 .

Here, the flow of intake air in intake device 225 will be described.
7 and 8, outside air flows as intake air W from the guide entrance opening 253 on the front surface of the intake duct upstream guide member 240 into the concave curved surface of the duct upstream guide surface 252 . Intake air W flows from the guide entrance opening 253 side along the duct upstream guide surface 252 toward the vertex 252b side, and then turns forward in the vicinity of the vertex 252b to reach the duct entrance of the upstream end portion 238a of the intake duct 238. 238b.
Here, since the guide inlet opening 253 of the intake duct upstream guide member 240 opens forward of the vehicle, the running wind when the motorcycle 201 travels forward flows directly into the guide inlet opening 253 . For this reason, the running wind can be efficiently taken in from the guide entrance opening 253 to the duct upstream side guide surface 252 as the intake air W.
In addition, since the inner diameter of the guide entrance opening 253 of the intake duct upstream guide member 240 is larger than the inner diameter of the duct entrance 238b of the intake duct 238, the intake air W is collected by the intake duct upstream guide member 240, and the gathered intake air W can be supplied to the duct entrance 238b, and the intake air W can be efficiently flown through the intake duct 238.

The duct entrance 238b of the air intake duct 238 is positioned inside the concave surface of the duct upstream guide surface 252, and the duct entrance 238b and the duct upstream guide surface 252 are continuous in the axial direction of the air intake duct 238. . Therefore, the intake air W guided by the duct upstream guide surface 252 can efficiently flow to the duct inlet 238b.
Furthermore, when viewed in the axial direction of the air intake duct 238, the duct entrance 238b of the air intake duct 238 overlaps with the vertex 252b of the duct upstream guide surface 252, so that the intake air W that is turned forward from the vicinity of the vertex 252b can be efficiently passed through the duct entrance. 238b.

The intake air W that has flowed into the air intake duct 238 from the duct inlet 238b flows from the duct outlet 238d at the front end of the air intake duct 238 into the dirty side 247D.
Specifically, the intake air W flowing into the dirty side 247D from the duct outlet 238d flows along the curved surface of the guide surface 265c of the intake duct downstream side guide member 265 and changes its direction toward the element inlet surface 237a on the inner side in the vehicle width direction. , from the outlet opening face 265a toward the element inlet face 237a. Therefore, intake air W can be efficiently supplied from the intake duct 238 to the air cleaner element 237 .

7 to 10, the intake air W that has flowed into the air cleaner element 237 from the element inlet surface 237a flows into the clean side 247C from the element outlet surface 237b, is guided by the connecting pipe upstream guide member 270, and flows into the connecting pipe. 239.
Specifically, the intake air W on the clean side 247C flows into the connection pipe upstream guide surface 271 from the guide opening 270a, flows backward along the curved surface of the connection pipe upstream guide surface 271, and reaches the upstream end. It flows into the connecting pipe 239 from the connecting pipe inlet 239c of 239a.
Intake air W of the connecting pipe 239 flows through the throttle body 231 and the insulator 232 to the intake port on the upper surface of the cylinder head 222b.
Here, since the inner diameter of the guide opening 270a of the connecting pipe upstream guide member 270 is larger than the inner diameter of the connecting pipe inlet 239c of the connecting pipe 239, the intake air W is collected by the connecting pipe upstream guide surface 271, and this collected The intake air W can be supplied to the connection pipe inlet 239c, and the intake air W can efficiently flow through the connection pipe 239.

A connecting pipe inlet 239c of the connecting pipe 239 is positioned inside the concave curved surface of the connecting pipe upstream guide surface 271, and the connecting pipe upstream guide surface 271 and the connecting pipe inlet 239c are arranged in the axial direction of the connecting pipe 239. Contiguous. Therefore, the intake air W guided by the connecting pipe upstream guide surface 271 can efficiently flow to the connecting pipe inlet 239c.

As described above, according to the second embodiment to which the present invention is applied, the intake purification device 230 includes the air cleaner box 235 whose inside is divided into the dirty side 247D and the clean side 247C by the air cleaner element 237. and a connection pipe 239 through which intake air flows from the clean side 247C toward the engine 211 side. A pipe upstream guide member 270 is provided, and the connection pipe upstream guide member 270 includes a concave curved connection pipe upstream guide surface 271 and a guide opening that is an opening in the concave curved surface of the connection pipe upstream guide surface 271 . 270a, the guide opening 270a being larger than the connecting tube inlet 239c.
According to this configuration, the intake air from the clean side 247C enters the connecting pipe upstream guide member 270 through the guide opening 270a, which is larger than the connecting pipe inlet 239c of the connecting pipe 239. 271 and flows into the connecting pipe inlet 239c of the connecting pipe 239. As shown in FIG. Therefore, the connection pipe upstream side guide member 270 facilitates the intake of air into the connection pipe 239, thereby improving the intake efficiency.

The connecting pipe upstream guide surface 271 is a concave curved surface that is recessed in the opposite direction to the element outlet surface 237b, which is the intake air outlet surface of the air cleaner element 237. The bottom portion 271a is positioned opposite the element outlet surface 237b with respect to the guide opening 270a.
According to this configuration, the intake air flowing from the element outlet surface 237b of the air cleaner element 237 can be efficiently flowed to the connecting pipe inlet 239c by the connecting pipe upstream guide surface 271. As shown in FIG.
In addition, at least a portion of a tangent line 270d located at an end portion 270c on the element outlet surface 237b side of the connecting pipe upstream guide surface 271 is oriented toward the element outlet surface 237b.
According to this configuration, the intake air flowing from the element outlet surface 237b toward the connecting pipe 239 can be smoothly taken into the connecting pipe upstream side guide member 270 through the guide opening 270a, and the intake efficiency can be improved.

Further, the guide opening 270a opens toward the element exit surface 237b.
According to this configuration, the intake air flowing from the element outlet surface 237b toward the connecting pipe 239 can be smoothly taken into the connecting pipe upstream side guide member 270 through the guide opening 270a, and the intake efficiency can be improved.
Also, the guide opening 270a is oriented along the element outlet surface 237b.
According to this configuration, the intake air can be efficiently taken into the connection pipe upstream guide member 270 from the guide opening 270a.

In addition, with respect to the distance L1 between the center 239d of the connecting pipe inlet 239c and the element outlet surface 237b, the bottom portion 271a, which is the farthest portion of the connecting pipe upstream guide surface 271 from the element outlet surface 237b, and the element outlet surface 237b. The distance L2 between is greater.
According to this configuration, the intake air can be guided over a wide range by the connection pipe upstream guide surface 271, and the intake air can efficiently flow to the connection pipe inlet 239c.
Further, when the upstream end portion 239a of the connecting pipe 239 is viewed in the axial direction, the connecting pipe upstream guide surface 271 has a larger diameter than the inner circumference of the upstream end portion 239a of the connecting pipe 239, The pipe upstream guide surface 271 surrounds the connection pipe 239 from the periphery.
According to this configuration, since the connection pipe upstream guide surface 271 having a diameter larger than the inner circumference of the upstream end portion 239a of the connection pipe 239 surrounds the connection pipe 239, the connection pipe upstream guide surface 271 guides the intake air. It can efficiently flow to the connecting pipe inlet 239c.

Further, when viewed in the axial direction of the connecting pipe 239, at least a portion of the connecting pipe upstream guide surface 271 overlaps the connecting pipe inlet 239c.
According to this configuration, the intake air can be guided over a wide range by the connection pipe upstream guide surface 271, and the intake air can efficiently flow to the connection pipe inlet 239c.
Furthermore, at least part of the connecting pipe upstream guide surface 271 overlaps the upstream end portion 239a of the connecting pipe 239 in the axial direction from the outer peripheral side.
According to this configuration, it is possible to continuously flow the intake air from the connection pipe upstream guide surface 271 to the upstream end portion 239a, and to efficiently flow the intake air to the connection pipe inlet 239c.

Further, the connection pipe upstream side guide member 270 is plate-shaped.
With this configuration, the volume occupied by the connecting pipe upstream guide member 270 can be reduced, and the volume of the clean side 247C can be secured.
Further, the upstream end portion 239a is arranged inside the concave curved surface of the connection pipe upstream guide surface 271 with respect to the guide opening portion 270a.
According to this configuration, it is possible to continuously flow the intake air from the connection pipe upstream guide surface 271 to the upstream end portion 239a, and to efficiently flow the intake air to the connection pipe inlet 239c.

Further, according to the second embodiment to which the present invention is applied, the intake air purification device 230 includes an air cleaner box 235 whose interior is partitioned into a dirty side 247D and a clean side 247C by an air cleaner element 237, and a dirty side 247C. 247D is provided with an intake duct 238 for introducing outside air as intake air, and outside the air cleaner box 235 and upstream of the intake duct 238, an intake air is provided to guide the intake air to a duct entrance 238b at an upstream end 238a of the intake duct 238. A duct upstream guide member 240 is provided, and the intake duct upstream guide member 240 has a concave curved duct upstream guide surface 252 and a guide inlet opening 253 which is an opening in the concave curved surface of the duct upstream guide surface 252 . and the guide inlet opening 253 is larger than the duct inlet 238b.
According to this configuration, the intake air enters the intake duct upstream guide member 240 through the guide entrance opening 253 larger than the duct entrance 238b of the intake duct 238, and is guided by the concave curved duct upstream guide surface 252. It flows to the duct inlet 238b of the intake duct 238. Therefore, the air intake duct upstream guide member 240 facilitates the intake of air into the air intake duct 238, thereby improving the air intake efficiency.

Also, the guide inlet opening 253 opens in a direction facing the duct inlet 238b.
According to this configuration, since the guide entrance opening 253 opens in a direction facing the duct entrance 238b, the intake air flowing from the guide entrance opening 253 to the concavely curved duct upstream guide surface 252 is efficiently directed toward the duct entrance 238b. can flow to
The intake air purification device 230 is mounted on the motorcycle 201, and the guide entrance opening 253 opens toward the front of the vehicle.
According to this configuration, the running wind of the motorcycle 201 running forward can be efficiently taken into the duct upstream side guide surface 252 from the guide entrance opening 253 that opens toward the front of the vehicle. can flow efficiently.

Further, the guide inlet opening 253 overlaps the upstream end 238a of the intake duct 238 in the axial direction of the axis 238e of the upstream end 238a of the intake duct 238 .
According to this configuration, since the guide entrance opening 253 overlaps the upstream end 238a of the intake duct 238, the flow of intake air around the upstream end 238a can be stabilized, and the intake efficiency can be improved.

[Third embodiment]
A third embodiment to which the present invention is applied will be described below with reference to FIGS. 12 to 15. FIG.
The third embodiment describes a motorcycle 301 that is different from the motorcycle 1 of the first embodiment.

FIG. 12 is a left side view of motorcycle 301 in the third embodiment. FIG. 13 is a cross-sectional view of the motorcycle 301. FIG.
A motorcycle 301 has an engine 311 as a power unit supported on a body frame 310 , a front fork 312 supporting a front wheel 302 steerably supported at the front end of the body frame 310 , and a swing arm supporting a rear wheel 303 . A vehicle 313 is provided on the rear side of the vehicle body frame 310 .
The motorcycle 301 is a saddle type vehicle in which a rider straddles a seat 314 , and the seat 314 is provided above the rear portion of the body frame 310 .
The motorcycle 301 includes a pair of left and right side covers 315 that cover the vehicle body such as the vehicle body frame 310 .
A steering handle 327 is provided at the upper end of the front fork 312 .

The vehicle body frame 310 includes a pair of right and left seat frames 318 behind the engine 311 that extend in the front-rear direction and support the seat 314 from below.
A fuel tank 323 is provided above the engine 311 and between the front fork 312 and the seat 314 in the longitudinal direction of the vehicle.

The engine 311 includes a crankcase 321 and a cylinder portion 322 extending upward from the upper surface of the front portion of the crankcase 321 .
An intake device 325 that supplies intake air to the cylinder portion 322 of the engine 311 is arranged behind the cylinder portion 322 and below the seat 314 .
The motorcycle 301 has a rear fender 344 that covers the space between the left and right seat frames 318 from below. The rear fender 344 is a plate-shaped member that extends rearward and upward along the seat frame 318 when viewed from the side of the vehicle, and is positioned above the rear wheel 3 . Rear fender 344 is an exterior component exposed to the outside of motorcycle 301 .

The intake device 325 includes an intake air purification device 330 and a throttle body 331 connected to an intake port on the rear surface of the cylinder portion 322 .

The intake air purification device 330 includes an air cleaner box 335, a partition wall 336 that partitions the inside of the air cleaner box 335, an air cleaner element 337 that is provided in the partition wall 336, an intake duct 338 that takes in the intake air into the air cleaner box 335, and an air cleaner box. 335 to the throttle body 331, and an intake duct upstream guide member 340 for guiding intake air to the intake duct 338 on the upstream side of the intake duct 338.

The air cleaner box 335 is a box-shaped member arranged between the left and right seat frames 318 . The air cleaner box 335 is positioned above the swing arm 313 and below the seat 314 and is covered with the seat 314 from above.

The partition wall 336 partitions the inside of the air cleaner box 335 into a dirty side 347D on the upstream side of the air cleaner element 337 and a clean side 347C on the downstream side of the air cleaner element 337. As shown in FIG. The partition wall 336 is a plate-like member arranged with its plate thickness direction oriented in the longitudinal direction of the vehicle, and partitions the interior of the air cleaner box 335 in the longitudinal direction of the vehicle.

The air cleaner element 337 is a plate-like member arranged with its plate thickness direction oriented in the vehicle width front-rear direction, and is supported by the partition wall 336 . The air cleaner element 337 is disposed tilted forward with respect to the vertical direction when viewed from the side of the vehicle.

The dirty side 347D is a room through which intake air flows before passing through the air cleaner element 337, and is provided at the rear inside the air cleaner box 335. As shown in FIG.
The clean side 347</b>C is a room through which the intake air after being purified by passing through the air cleaner element 337 flows, and is provided in the front part of the air cleaner box 335 .
The air cleaner element 337 has an element entrance surface 337a exposed on the dirty side 347D and an element exit surface 337b exposed on the clean side 347C.

The air intake duct 338 extends from the rear of the air cleaner box 335 to the rear outside of the air cleaner box 335 and communicates the dirty side 347</b>D with the space outside the air cleaner box 335 .

The connection pipe 339 penetrates the front surface of the air cleaner box 335 from the inside of the clean side 347</b>C, extends forward outside the air cleaner box 335 , and is connected to the throttle body 331 .
An opening 339a at the upstream end of the connection pipe 339 in the flow of intake air substantially faces the element outlet surface 337b from the rear and opens toward the rear of the vehicle.

FIG. 14 is a perspective view of the periphery of the air cleaner box 335 viewed from above with the seat 314 removed. FIG. 15 is a plan view of the intake duct 338 and the periphery of the intake duct upstream guide member 340 viewed from above.
Referring to FIGS. 13-15, intake duct 338 extends rearwardly through the space between seat 314 and rear fender 344 . Also, the intake duct 338 is positioned between the left and right seat frames 318 .
The air intake duct 338 extends substantially straight rearwardly upward along a rear fender 344 that is inclined rearwardly upwardly when viewed from the side of the vehicle.
The intake duct 338 is a tube with a substantially circular cross section. The intake duct 338 extends straight in a direction substantially orthogonal to the element inlet surface 337a.

The rear end of the intake duct 338 is an upstream end 338a of the intake duct 338 in the flow of intake air. The intake duct 338 takes in outside air as intake air from a duct inlet 338b on the rear end surface of the upstream end 338a.
The front end of the intake duct 338 is the downstream end 338c of the intake duct 338 in the flow of intake air. A duct outlet 338d on the front end face of the downstream end 338c substantially faces the element inlet face 337a from the rear and opens to the top of the dirty side 347D.

The intake duct upstream guide member 340 is arranged upstream of the upstream end 338a of the intake duct 338 in the flow of intake air and behind the upstream end 338a. Also, the intake duct upstream guide member 340 is attached to the upper surface of the rear fender 344 .

The intake duct upstream guide member 340 includes a guide portion 350 that guides intake air toward the duct inlet 338b of the upstream end portion 338a, and an attachment portion 351 that is attached to the rear fender 344. As shown in FIG.

The guide part 350 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spherical body in half.
The cup-shaped inner surface of the guide portion 350 is a concave curved duct upstream guide surface 352 . A guide entrance opening 353 that is an opening in the concave curved surface of the duct upstream guide surface 352 exposes the duct upstream guide surface 352 to the outside in the cup shape of the guide portion 350 .

A peripheral edge portion 352a of the duct upstream guide surface 352 that defines the guide inlet opening 353 is arcuate.
The apex 352 b of the concavely curved surface of the duct upstream guide surface 352 is positioned at the bottom of the inner surface of the cup-shaped guide portion 350 . The inner diameter of the duct upstream guide surface 352 increases from the apex 352b toward the guide entrance opening 353 side.

Further, the guide portion 350 includes a notch opening 375 formed by notching a side portion of the cup shape of the guide portion 350 around the guide inlet opening 353 . The cutout opening 375 is an opening surface substantially perpendicular to the guide entrance opening 353 .

The intake duct upstream guide member 340 is arranged upright so that the guide entrance opening 353 of the guide portion 350 faces the front of the vehicle. The notch opening 375 is provided in the upper portion of the guide portion 350 and opens upward.
The attachment portion 351 protrudes rearward from the outer periphery of the guide portion 50 at the lower end portion of the guide portion 350 .
The intake duct upstream guide member 340 is fixed to the upper surface of the rear fender 344 by a fixture 354 vertically inserted into the mounting portion 351 .

The intake duct upstream guide member 340 is arranged such that the guide entrance opening 353 of the guide portion 350 faces the duct entrance 338b of the upstream end 338a of the intake duct 338 . The guide inlet opening 353 opens toward the front side of the vehicle. More specifically, the guide inlet opening 353 is slightly inclined forward when viewed from the side of the vehicle, and opens forward and downward.
The inner diameter of the guide inlet opening 353 of the guide portion 350 is larger than the inner diameter of the duct inlet 338b of the intake duct 338 and the outer diameter of the upstream end 338a.

The intake duct 338 has a duct inlet 338 b entirely located inside the concavely curved surface of the duct upstream guide surface 352 , and the duct inlet 338 b opens inside the duct upstream guide surface 352 . In other words, the duct inlet 338b is located on the rear side of the guide inlet opening 353 and on the bottom side of the cup shape.
A space is provided in the axial direction of the intake duct 338 between the cup-shaped bottom of the duct upstream guide surface 352 and the duct entrance 338b.

The cup-shaped axis 352c of the duct upstream guide surface 52 and the axis 338e of the intake duct 338 are substantially parallel and substantially overlap each other. The axis 352c and the axis 338e are inclined forward and downward when viewed from the side of the vehicle. A lower portion of the duct upstream guide surface 352, which is below the axis 352c, is inclined forward and downward.
When viewed in the axial direction of intake duct 338 , duct entrance 338 b of intake duct 338 overlaps vertex 352 b of duct upstream guide surface 352 .

The duct upstream guide surface 352 covers the upstream end 338a of the intake duct 338 located inside the concave curved surface of the duct upstream guide surface 352 from the periphery and rear side of the upstream end 338a. That is, the guide inlet opening 353 of the duct upstream guide surface 352 overlaps the upstream end 338a of the intake duct 338 in the flow direction of the intake air from the outer peripheral side. The upstream end portion 338 a and the duct upstream guide surface 352 are continuous in the intake air flow direction of the intake duct 338 .
Here, the direction of flow of intake air in the intake duct 338 is the axial direction of the intake duct 338 .

Referring to FIGS. 13 and 14, the outside air flows as intake air W from the guide entrance opening 353 on the front surface of the intake duct upstream guide member 340 and the cutout opening 375 on the upper surface of the intake duct upstream guide surface 352 to the concave curved surface of the duct upstream guide surface 352. flows into the inside of The intake air W flows along the duct upstream guide surface 352 toward the apex 352b side, turns back near the apex 352b, and flows into the duct entrance 338b of the upstream end 338a of the intake duct 338 .

As described above, according to the third embodiment to which the present invention is applied, the intake duct upstream guide member 340 has a cutout portion around the guide inlet opening 353 in the intake duct upstream guide member 340. A cutout opening 375 is provided.
According to this configuration, the intake air can be taken into the intake duct upstream guide member 340 from the cutout opening 375, and the amount of intake air can be increased.
Also, the intake duct upstream guide member 340 is fixed to a rear fender 344 that is an exterior component of the motorcycle 301 .
According to this configuration, the rear fender 344, which is an exterior component, has relatively high rigidity and can support the large intake duct upstream guide member 340, so that the intake duct upstream guide member 340 can have a high degree of freedom in its shape.
For example, the mounting portion 351 may be extended outward in the vehicle width direction and connected to the seat frame 318 , and the intake duct upstream guide member 340 may be fixed to the vehicle body frame 310 via the mounting portion 351 . In this case, the vehicle body frame 310 has high rigidity and can support the large-sized intake duct upstream guide member 340, so the degree of freedom in the shape of the intake duct upstream guide member 340 can be increased.

[Fourth embodiment]
A fourth embodiment to which the present invention is applied will be described below with reference to FIGS. 16 and 17. FIG.
The fourth embodiment describes a motorcycle 401 that is different from the motorcycle 1 of the first embodiment.

FIG. 16 is a cross-sectional view of motorcycle 401 in the fourth embodiment.
A motorcycle 401 has an engine 411 supported by a vehicle body frame 410 , and a front fork (not shown) that steerably supports a front wheel (not shown) is steerably supported at the front end of the vehicle body frame 410 to support a rear wheel 403 . This vehicle has a swing arm (not shown) provided on the rear side of the vehicle body frame 410 .
The motorcycle 401 is a saddle-ride type vehicle in which a rider sits astride a seat 414 .

The vehicle body frame 410 includes a pair of left and right seat frames 418 behind the engine 411 that extend in the front-rear direction and support the seat 414 from below.
A fuel tank 423 is provided above the engine 411 and in front of the seat 414 .

The engine 411 includes a crankcase 421 and a cylinder portion 422 extending upward from the upper surface of the front portion of the crankcase 421 .
An intake device 425 that supplies intake air to the cylinder portion 422 is arranged behind the cylinder portion 422 and below the seat 414 .
The motorcycle 401 includes a rear fender 444 that covers the space between the left and right seat frames 418 from below.

The intake device 425 includes an intake purification device 430 and a throttle body 431 connected to an intake port on the rear surface of the cylinder portion 422 .

The intake air purification device 430 includes an air cleaner box 435, a partition wall 436 that partitions the inside of the air cleaner box 435, an air cleaner element 437 that is provided in the partition wall 436, an intake duct 438 that takes in the air into the air cleaner box 435, and an air cleaner box. 435 and a connecting pipe 439 that connects the throttle body 431 .
Further, the intake air purification device 430 includes an intake duct upstream guide member 440 that guides the intake air to the intake duct 438 on the upstream side of the intake duct 438, and an intake duct that guides the intake air to the air cleaner element 437 on the downstream side of the intake duct 438. A downstream guide member 465 and a connection pipe upstream guide member 470 that guides intake air to the connection pipe 439 on the upstream side of the connection pipe 439 are provided.

The air cleaner box 435 is a box-shaped member arranged between the left and right seat frames 418 . The air cleaner box 435 is positioned above the front of the rear wheel 403 and below the seat 414 and is covered with the seat 414 from above.

The partition wall 436 partitions the inside of the air cleaner box 435 into a dirty side 447D on the upstream side of the air cleaner element 437 and a clean side 447C on the downstream side of the air cleaner element 437. As shown in FIG. The partition wall 436 is a plate-like member arranged with its plate thickness direction oriented in the vertical direction, and partitions the inside of the air cleaner box 435 in the vertical direction.

The air cleaner element 437 is a plate-like member arranged with the plate thickness direction oriented in the vertical direction, and is supported by the partition wall 436 . The air cleaner element 437 is disposed so as to be inclined forward and downward when viewed from the side of the vehicle.

The dirty side 447D is a chamber through which intake air flows before passing through the air cleaner element 437, and is provided in the lower part inside the air cleaner box 435. As shown in FIG.
The clean side 447</b>C is a chamber through which the intake air after being purified by passing through the air cleaner element 437 flows, and is provided in the upper part of the air cleaner box 435 .
The air cleaner element 437 has an element inlet surface 437a exposed on the dirty side 447D and an element outlet surface 437b exposed on the clean side 447C.

The air intake duct 438 extends from the rear of the air cleaner box 435 to the outside of the air cleaner box 435 and communicates the dirty side 447</b>D with the space outside the air cleaner box 435 .
Air intake duct 438 extends rearward through a space between seat 414 and rear fender 444 . Also, the intake duct 438 is positioned between the left and right seat frames 418 .

The rear end of the intake duct 438 is an upstream end 438a of the intake duct 438 in the flow of intake air. The intake duct 438 takes in outside air as intake from a duct inlet 438b on the rear end surface of the upstream end 438a.
The front end of the intake duct 438 is the downstream end 438c of the intake duct 438 in the flow of intake air. The downstream end 438c extends back and forth below the element inlet surface 437a and substantially parallel to the element inlet surface 437a. Intake air flows into the dirty side 447D from the duct outlet 438d on the front end surface of the downstream end 438c.
A cup-shaped intake duct downstream guide member 465 that opens toward the element inlet surface 437a is attached to the downstream end 438c of the intake duct 438. As shown in FIG. The intake duct downstream side guide member 465 guides the intake air flowing into the dirty side 447D from the duct outlet 438d to the element inlet surface 437a.

The connection pipe 439 penetrates the front surface of the air cleaner box 435 from within the clean side 447</b>C, extends forward outside the air cleaner box 435 , and is connected to the throttle body 431 .
An upstream end 439a of the connecting pipe 439 in the flow of intake air is positioned above the element outlet surface 437b within the clean side 447C and extends back and forth substantially parallel to the element outlet surface 437b. Intake air in the clean side 447C flows into the connecting pipe 439 from the connecting pipe inlet 439c on the rear end surface of the upstream end portion 439a.

A connection pipe upstream guide member 470 is attached to the upstream end portion 439 a of the connection pipe 439 . The connection pipe upstream guide member 470 guides the intake air flowing into the clean side 447C from the element outlet surface 437b to the connection pipe inlet 439c.
The connection pipe upstream guide member 470 is shaped like a hemispherical cup shape obtained by cutting a hollow spherical body at a guide opening 470a and further cutting at an outlet opening 470b substantially orthogonal to the guide opening 470a. is a cup-shaped member.
The connection pipe upstream guide member 470 is arranged with the guide opening 470a, which is a cup-shaped opening surface, directed toward the element outlet surface 437b.
The cup-shaped inner surface of the connecting pipe upstream guide member 470 is a curved connecting pipe upstream guide surface 471 that guides the intake air toward the connecting pipe inlet 439c.
The upstream end 439a of the connecting tube 439 enters the connecting tube upstream guide surface 471 through the outlet opening 470b.
The inner diameter of the guide opening 470 a of the connecting pipe upstream guide member 470 is larger than the inner diameter of the connecting pipe inlet 439 c of the connecting pipe 439 .

FIG. 17 is a perspective view of the air intake duct 438 and the periphery of the air intake duct upstream guide member 440 viewed from above with the seat 414 removed.
16 and 17, intake duct upstream guide member 440 is arranged upstream of upstream end 438a of intake duct 438 in the flow of intake air and behind upstream end 438a. The intake duct upstream guide member 440 is attached to the outer periphery of the upstream end 438a.

The intake duct upstream guide member 440 includes a guide portion 450 that guides intake air toward the duct inlet 438b of the upstream end portion 438a of the intake duct 438, and a duct mounting portion 451 attached to the intake duct 438. As shown in FIG.

The guide part 450 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spherical body in half.
The cup-shaped inner surface of the guide portion 450 is a concave curved duct upstream guide surface 452 . A guide entrance opening 453 that is an opening in the concave curved surface of the duct upstream guide surface 452 exposes the duct upstream guide surface 452 to the outside in the cup shape of the guide portion 450 .

A peripheral edge portion 452a of the duct upstream guide surface 452 that defines the guide entrance opening 453 is arcuate.
The apex 452 b of the concavely curved surface of the duct upstream guide surface 452 is positioned at the bottom of the inner surface of the cup-shaped guide portion 450 . The inner diameter of the duct upstream guide surface 452 increases from the vertex 452b toward the guide entrance opening 453 side.
In addition, the guide portion 450 includes a cutout opening 475 formed by cutting out a portion around the guide inlet opening 453 in the guide portion 450 .

The intake duct upstream guide member 440 is arranged upright so that the guide entrance opening 453 of the guide portion 450 faces the front of the vehicle.
The cutout opening 475 includes an upper surface opening 475a formed by cutting the upper surface of the guide portion 450 and a pair of side openings 475b formed by cutting left and right side surfaces of the guide portion 450 .

The intake duct upstream guide member 440 is arranged such that the guide entrance opening 453 of the guide portion 450 faces the duct entrance 438b of the upstream end 438a of the intake duct 438 . The guide inlet opening 453 opens toward the front side of the vehicle.
The inner diameter of the guide inlet opening 453 of the guide portion 450 is larger than the inner diameter of the duct inlet 438b of the intake duct 438 and the outer diameter of the upstream end 438a.

A band member 476 is attached to the outer circumference of the upstream end 438 a of the intake duct 438 . The band member 476 is provided so as to wrap around the outer periphery of the upstream end portion 438a.
The duct attachment portion 451 of the intake duct upstream guide member 440 extends forward with respect to the guide inlet opening 453 and is fixed to the band member 476 . That is, the intake duct upstream guide member 440 is supported by the intake duct 438 via the band member 476 .

16 and 17, outside air flows as intake air W from the guide entrance opening 453 and the notch opening 475 of the intake duct upstream guide member 440 into the concave curved surface of the duct upstream guide surface 452. do. The intake air W flows along the duct upstream guide surface 452 toward the vertex 452b, then turns forward in the vicinity of the vertex 452b and flows into the duct entrance 438b of the upstream end 438a of the intake duct 438.

As described above, according to the fourth embodiment to which the present invention is applied, intake duct upstream guide member 440 is fixed to intake duct 438 .
According to this configuration, the assembly error of the intake duct upstream guide member 440 with respect to the intake duct 438 can be reduced, and the intake duct upstream guide member 440 can be fixed at the correct position.

[Fifth embodiment]
A fifth embodiment to which the present invention is applied will be described below with reference to FIGS. 18 and 19. FIG.
The fifth embodiment describes a motorcycle 501 that is different from the motorcycle 1 of the first embodiment.

FIG. 18 is a left side view of motorcycle 501 in the fifth embodiment. 19 is a cross-sectional view taken along line XIX-XIX of FIG. 18. FIG.
The motorcycle 501 is a straddle-type vehicle having an engine 511 between front wheels 502 and rear wheels 503 .
The motorcycle 501 has an air intake device 525 behind the engine 511 and below the passenger seat 514 .
Intake device 525 includes an intake purification device 530 and a throttle body 531 connected to an intake port of engine 511 .

The intake air purification device 530 includes an air cleaner box 535, a partition wall 536 that partitions the inside of the air cleaner box 535, an air cleaner element 537 that is provided in the partition wall 536, an intake duct 538 that takes intake air into the air cleaner box 535, and an air cleaner box. 535 and a connecting pipe 539 that connects the throttle body 531 .

Further, the intake air purification device 530 includes an intake duct upstream guide member 540 that guides the intake air to the intake duct 538 on the upstream side of the intake duct 538, and an intake duct that guides the intake air to the air cleaner element 537 on the downstream side of the intake duct 538. A downstream guide member 565 and a connection pipe upstream guide member 570 that guides intake air to the connection pipe 539 on the upstream side of the connection pipe 539 are provided.
The intake duct upstream guide member 540 has the same structure and function as the intake duct upstream guide member 240 of the second embodiment, and detailed description thereof will be omitted.
The intake duct downstream guide member 565 has the same structure and function as the intake duct downstream guide member 265 of the second embodiment, and detailed description thereof will be omitted.
The connection pipe upstream guide member 570 has the same structure and function as the connection pipe upstream guide member 270 of the second embodiment, and detailed description thereof will be omitted.

The partition wall 536 and the air cleaner element 537 partition the interior of the air cleaner box 535 in the vehicle width direction, and a dirty side 547D is defined on one side of the partition wall 536 in the vehicle width direction, and a dirty side 547D is defined on the other side of the partition wall 536 in the vehicle width direction. A clean side 547C is defined.
The partition wall 536 and the air cleaner element 537 are plate-like members arranged with the plate thickness direction oriented in the vehicle width direction.

The air intake duct 538 extends rearward from the rear portion of the air cleaner box 535 and communicates the dirty side 547D with the space outside the air cleaner box 535 .
The rear end of the intake duct 538 is an upstream end 538a of the intake duct 538 in the flow of intake air. An intake duct upstream guide member 540 is attached to the upstream end 538a.
The front end of the intake duct 538 is the downstream end 538c of the intake duct 538 in the flow of intake air. An intake duct downstream guide member 565 is attached to the downstream end 538c.

The connection pipe 539 extends forward through the front surface of the air cleaner box 535 from within the clean side 547</b>C and is connected to the throttle body 531 .
A rear end portion of the connection pipe 539 is an upstream end portion 539a of the connection pipe 539 in the flow of intake air. A connection pipe upstream guide member 570 is attached to the upstream end 539a.

[Sixth embodiment]
A sixth embodiment to which the present invention is applied will be described below with reference to FIGS. 20 and 21. FIG.
The sixth embodiment describes a motorcycle 601 that is different from the motorcycle 1 of the first embodiment.

FIG. 20 is a left side view of motorcycle 601 in the sixth embodiment. 21 is a cross-sectional view taken along line XXI-XXI of FIG. 20. FIG.
The motorcycle 601 is a saddle-ride type vehicle having a passenger seat 614 between front wheels 602 and rear wheels 603 .
The motorcycle 601 is a scooter-type saddle-riding vehicle provided with a unit swing engine 611 integrally including a swing arm portion 611a for swingably supporting a rear wheel 603 on the vehicle body and an engine 611b.

The intake device 625 is attached to the upper surface of the swing arm portion 611 a and swings up and down integrally with the unit swing engine 611 .
The intake device 625 includes an intake purification device 630 and a throttle body (not shown) connected to an intake port of the engine 611b.

The intake air purification device 630 includes an air cleaner box 635, a partition wall 636 that partitions the inside of the air cleaner box 635, an air cleaner element 637 that is provided in the partition wall 636, an intake duct 638 that introduces the intake air into the air cleaner box 635, and an air cleaner box. and a connecting pipe 639 that connects 635 to the throttle body.

Further, the intake air purification device 630 includes an intake duct upstream guide member 640 that guides intake air to the intake duct 638 on the upstream side of the intake duct 638, and an intake duct that guides the intake air to the air cleaner element 637 on the downstream side of the intake duct 638. A downstream guide member 665 and a connection pipe upstream guide member 670 that guides intake air to the connection pipe 639 on the upstream side of the connection pipe 639 are provided.
The intake duct upstream guide member 640 has the same structure and function as the intake duct upstream guide member 240 of the second embodiment, and detailed description thereof will be omitted.
The intake duct downstream guide member 665 has the same structure and function as the intake duct downstream guide member 265 of the second embodiment, and detailed description thereof will be omitted.
The connection pipe upstream guide member 670 has the same structure and function as the connection pipe upstream guide member 270 of the second embodiment, and detailed description thereof will be omitted.

The air cleaner box 635 is arranged outside the rear wheel 603 . A side cover 635 a is attached to the outer surface of the air cleaner box 635 .
The partition wall 636 and the air cleaner element 637 partition the inside of the air cleaner box 635 in the vehicle width direction, and the dirty side 647D is defined outside the partition wall 636 in the vehicle width direction, and the clean side is partitioned inside the partition wall 636 in the vehicle width direction. 647C is partitioned.
The partition wall 636 and the air cleaner element 637 are plate-like members arranged with the plate thickness direction oriented in the vehicle width direction.

The air intake duct 638 extends forward from the front portion of the air cleaner box 635 and communicates the dirty side 647D with the space outside the air cleaner box 635 .
The front end of the intake duct 638 is the upstream end 638a of the intake duct 638 in the flow of intake air. An intake duct upstream guide member 640 is attached to the upstream end 638a. The intake duct upstream guide member 640 is covered from the side by a side cover 635a.
The rear end of the intake duct 638 is the downstream end 638c of the intake duct 638 in the flow of intake air. An intake duct downstream guide member 665 is attached to the downstream end 638c.

The connection pipe 639 extends forward from inside the clean side 647C through the front surface of the air cleaner box 635 and is connected to the throttle body.
A rear end portion of the connection pipe 639 is an upstream end portion 639a of the connection pipe 639 in the flow of intake air. A connection pipe upstream guide member 670 is attached to the upstream end 639a.

1,201,301,401 Motorcycle (Vehicle)
30, 230, 330, 430 Intake purification device 35, 235, 335, 435 Air cleaner box 37, 237, 337, 437 Air cleaner element 38, 238, 338, 438 Intake duct 38a, 238a, 338a, 438a Upstream end (Upstream end of intake duct)
38b, 238b, 338b, 438b duct inlet 38e, 238e, 338e axis 40, 240, 340, 440 intake duct upstream guide member 47C, 247C, 347C, 447C clean side 47D, 247D, 347D, 447D dirty side 52, 252, 352, 452 Duct upstream guide surface 53, 253, 353, 453 Guide entrance opening 344 Rear fender (exterior part)
375, 475 cutout opening

Claims (7)

An intake purification device comprising an air cleaner box whose interior is partitioned into a dirty side and a clean side by an air cleaner element, and an intake duct that introduces outside air into the dirty side as intake air,
Outside the air cleaner box and upstream of the air intake duct , an air intake duct upstream guide member is provided for guiding intake air to a duct entrance at an upstream end of the air intake duct,
The intake duct upstream guide member has a concavely curved duct upstream guide surface and a guide inlet opening that is an opening in the concavely curved surface of the duct upstream guide surface ,
the guide inlet opening is larger than the duct inlet ;
The intake purification device is mounted on a vehicle,
The duct inlet opens toward the rear of the vehicle,
The guide entrance opening opens toward the front of the vehicle,
the duct entrance is located inside the concave curved surface of the duct upstream guide surface ,
The intake air purifier, wherein the guide inlet opening opens in a direction facing the duct inlet . 2. The guide entrance opening is arranged so as to overlap the upstream end of the air intake duct in the axial direction of the axis of the upstream end of the air intake duct . The intake air purification device described. 2. The intake duct upstream guide member has a notch opening formed by cutting out a portion surrounding the guide inlet opening in the intake duct upstream guide member. 2. The intake air purification device according to 2. 4. The intake air purifier according to claim 1, wherein the intake duct upstream guide member is fixed to the intake duct . 4. The intake purification device according to claim 1, wherein the intake duct upstream guide member is fixed to a vehicle body frame or an exterior component of the vehicle. 3. The intake air purifier according to claim 1, wherein the guide inlet opening is inclined forward when viewed from the side of the vehicle and opens forward and downward. 2. The intake air purifying device according to claim 1, wherein side openings are provided in left and right side surfaces of said intake duct upstream guide member so as to allow the inside of said duct upstream guide surface to communicate with the outside.

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