JP4097685B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle including a primary injector and a secondary injector.

  Conventionally, as a high output engine such as an engine mounted on a motorcycle for racing, there is one in which two injectors are provided in an intake passage for each cylinder so as to further increase a maximum output. These injectors are disposed in a throttle valve device connected to the cylinder head through, for example, a rubber joint, and in the vicinity of an air funnel that is connected to the upstream side of the throttle valve device and faces the air cleaner box.

  The injector attached to the throttle valve device is hereinafter referred to as a primary injector, and the injector provided near the air funnel is hereinafter referred to as a secondary injector. Most of the primary injectors inject fuel in the entire engine rotation range, but some of the primary injectors stop injection after being injected by the secondary injector. The secondary injector injects fuel when the engine rotation range is in a high rotation range or during a high load such as during rapid acceleration.

  Among these injectors, the secondary injector is provided with mounting parts such as a columnar bracket extending from the throttle valve device into the air cleaner box and three leg members extending upstream from the opening end of the air funnel. The axis line was supported so as to be substantially parallel to the center line of the intake passage in the air funnel.

  However, the conventional fuel supply device for a motorcycle engine configured as described above has a problem in the structure for supporting the secondary injector. This is because columnar brackets and leg members are used to hold the secondary injector in the so-called air.

A motorcycle according to the present invention includes a frame, an engine mounted on the frame, an intake passage having an opening end portion and extending obliquely upward rearwardly from the engine, and connected to the intake passage. An intake box having a box-shaped box body, a lid having a wall facing the opening end and closing the opening of the upper end of the box body, and the intake passage. A primary injector that injects fuel throughout the engine rotation range, and a secondary injector that is disposed on a wall facing the opening end of the intake passage in the lid of the intake box. is there.

  The secondary injector may inject fuel in a high rotation range of the engine.

  The secondary injector may inject fuel when the engine is heavily loaded.

  Hereinafter, an embodiment of a fuel supply device for a motorcycle engine according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a side view of a fuel supply apparatus according to this embodiment. FIG. 2 is an enlarged view of a main part. The figure is drawn with the upstream end portions of an air cleaner box and a throttle valve device broken. . FIG. 3 is a plan view of the fuel supply device.

  In these drawings, what is denoted by reference numeral 1 is an engine for a motorcycle according to this embodiment. The engine 1 is a water-cooled parallel four-cylinder engine and is mounted on a motorcycle body frame 3 with the cylinder 2 tilted forward. The cylinder 2 includes a cylinder body 5 projecting obliquely upward from the front side of the vehicle body from the crankcase 4, a cylinder head 6 attached to the upper end portion of the cylinder body 5, and an upper end portion of the cylinder head 6. The head cover 7 is used.

  The cylinder head 6 has an exhaust pipe (not shown) connected to the wall on the front side of the vehicle body, and an intake device 8 to be described later connected to the wall on the rear side of the vehicle body.

  As is well known in the art, the vehicle body frame 3 has a pair of left and right tank rails 9 extending rearwardly downward from a head pipe (not shown), and a fuel tank 10 (see FIG. 1). Support). The fuel tank 10 is formed with a recess 11 that opens downward in the lower part of the front side of the vehicle body. The recessed portion 11 is formed so as to bulge a part of the bottom wall of the fuel tank 10 upward, and accommodates the air cleaner box 12 of the intake device 8.

  The intake device 8 includes a throttle valve device 14 for each cylinder connected to the cylinder head 6 via a rubber joint 13, the air cleaner box 12 attached to the upstream end of the throttle valve device 14, and the like. Yes.

  The throttle valve device 14 is formed so that an internal intake passage extends obliquely linearly upward toward the rear side of the vehicle body, and includes a slide type throttle valve 14a. The throttle valve device 14 is disposed in a space formed between the pair of left and right tank rails 9.

  As shown in FIG. 2, an air funnel 21 as an opening end of an intake passage according to the present invention is attached to the upstream end of the throttle valve device 14 so as to face the air cleaner box 12 from below.

  As shown in FIGS. 1 and 2, the air cleaner box 12 includes a box-shaped box body 22 attached to the throttle valve device 14 and a lid body 23 that closes an opening at the upper end of the box body 22. Has been. Further, as shown in FIG. 3, the planar shape of the air cleaner box 12 is formed in a semicircular shape that protrudes forward. The air cleaner box 12 constitutes an intake box according to the present invention.

  The bottom of the box body 22 is attached to the throttle valve device 14 at the bottom of the vehicle body, and an intake duct 24 (see FIG. 1) that extends obliquely downward on the front side of the vehicle body is integrally formed at the end of the vehicle body. . In addition, an air cleaner element (not shown) is attached to a front portion in the box body 22 and a connection portion with the intake duct 24.

  When the box body 22 is attached to the throttle valve device 14, as shown in FIG. 2, the bottom wall 22 a of the box body 22 is overlapped with the upper end portion of the throttle valve device 14, and the air funnel is screwed to the throttle valve device 14. A structure in which the bottom wall 22a is pressed to the box body 22 side by a flange 21a provided in the box 21 is employed.

  The lid body 23 is formed in a lid shape that opens downward, and is put on the box body 22 by a locking member such as a rubber band (not shown) in a state where the lid body 23 is put on the opening at the upper end of the box body 22. Removably attached. A secondary injector 26 as an injector of the fuel supply device 25 according to the present invention is attached to an end of the lid 23 on the rear side of the vehicle body on the upper wall 23a.

  Further, as shown in FIG. 2, the lid body 23 is formed so that the opening edge portion of the lower end portion fits outside the opening edge portion of the box body 22.

  More specifically, the fitting portion between the lid body 23 and the box body 22 has a horizontal direction (a direction substantially orthogonal to a direction in which the opening is directed, and a front-rear direction and a left-right direction), and a vertical direction (the opening is One direction) and the other in the direction of the other). The box main body 22 and the lid body 23 according to this embodiment are formed of fiber reinforced plastic, so that the fitting portion is gently formed. In order to produce the box main body 22 and the lid body 23 in large quantities. When molding using a mold, the fitting part is formed, for example, so that the entire opening edge of the box body 22 has a step with a step larger than other parts and the opening width is widened, and a lid is placed inside the enlarged diameter part. A structure is adopted in which the opening edge of the body 23 is fitted over the entire area. Note that a seal member such as an O-ring can be interposed in the fitting portion.

  The fuel supply device 25 includes a primary injector 27 attached to the throttle valve device 14 for each cylinder, a secondary injector 26 for each cylinder attached to the lid body 23, and a fuel tank to these injectors 26, 27. The fuel pipe assembly 28 for supplying the fuel from the fuel tank 10 and the like. The fuel supply device 25 according to this embodiment supplies fuel by the primary injector 27 over the entire rotation range of the engine 1, and when the rotation range of the engine 1 is in a high rotation range or during a high load such as during rapid acceleration, The fuel is also supplied from the secondary injector 26.

  As shown in FIGS. 1 and 2, the primary injector 27 has one end attached to the rear wall of the vehicle body of the throttle valve device 14 and a fuel rail 29 connected to the other end. The fuel is injected downstream of the throttle valve 14a. The fuel rail 29 is fed with fuel from a fuel pipe assembly 28 described later.

  As shown in FIG. 2, the secondary injector 26 is attached to the upper wall 23 a of the lid 23 via a bracket 31, and its axis is above the air funnel 21 and the axis of the air funnel 21 (the center of the intake passage) Line). The axis of the secondary injector 26 is indicated by a one-dot chain line C in FIG. Further, the secondary injector 26 according to this embodiment is disposed at a position where a lower end portion for injecting fuel faces the inside of the air funnel 21 from above.

  As shown in FIGS. 2 and 3, the bracket 31 for attaching the secondary injector 26 to the lid body 23 includes a fuel rail 32 extending in the vehicle width direction along the rear wall 23 b of the lid body 23, and the fuel rail 32. An upper arm 33 extending forward of the vehicle body along the upper wall 23a of the lid body 23, a lower arm 34 extending obliquely downward from the fuel rail 32 to the front side of the vehicle body, and from the fuel rail 32 beside the upper arm 33 A mounting seat 35 projecting toward the front side of the vehicle body is provided.

  A fuel passage (not shown) is formed in the fuel rail 32 of the bracket 31 and a fuel pipe assembly 28 described later is connected thereto.

  The upper arm 33 and the lower arm 34 of the bracket 31 are provided for each secondary injector 26. The upper arm 33 is provided with a socket 33a attached to the upper end portion of the secondary injector 26 at the end portion on the front side of the vehicle body. A fuel passage 33b for guiding fuel from inside the fuel rail 32 is formed in the fuel inlet (not shown) of the secondary injector 26 attached to the socket 33a.

  The lower arm 34 is provided with a ring-shaped holder 34a into which the lower portion of the secondary injector 26 is fitted at the end on the front side of the vehicle body. In this embodiment, the lower arm 34 is formed integrally with the fuel rail 32, and the upper arm 33 formed separately from the lower arm 34 cooperates with the lower arm 34. The secondary injector 26 is attached with fixing bolts 33c (see FIG. 3).

  In the mounting seat 35, a flat surface 35b is formed around the screw hole 35a (see FIG. 3) to which the fixing bolt 36 is screwed. The fixing bolt 36 passes through the upper wall 23a of the lid 23 from above and is screwed into the screw hole 35a.

  The fuel pipe assembly 28 has a downstream end connected to a fuel rail 29 on the primary injector 27 side and a fuel rail 32 on the secondary injector 26 side via couplers 38 and 37, respectively. Is connected to a fuel outlet of a fuel pump (not shown) in the fuel tank 10. The fuel supply device 25 according to this embodiment has an excess fuel via a pipe not shown from a fuel return port 41a (see FIG. 3) of the pressure regulator 41 connected to the fuel rail 29 on the primary injector 27 side. Is configured to return the fuel to the fuel tank 10. The pressure regulator 41 is for maintaining the pressure of the fuel system at a predetermined pressure, as is well known in the art.

  The couplers 37 and 38 have a structure that can be attached and detached without using a tool, and a structure in which the fuel passage is closed when removed from the fuel pipe assembly 28 is used. As shown in FIG. 2, the coupler 37 connected to the fuel rail 32 on the secondary injector 26 side is attached from above to a fuel pipe 39 extending in the vertical direction behind the air cleaner box 12. The coupler 37 and the fuel rail 32 on the secondary injector 26 side are connected by a pipe 40 that penetrates the rear wall 23b of the lid body 23.

  According to the fuel supply device 25 of the motorcycle engine 1 configured as described above, the air funnel 21 as the opening end portion of the intake passage faces the inside of the air cleaner box 12, and the secondary injector 26 is provided in the air cleaner box 12. Since the secondary injector 26 is provided in the vicinity of the open end of the intake passage so as to be held in the air, the secondary injector 26 is supported by extending from the open end of the intake passage to the upstream side of intake air. The member to do becomes unnecessary. Since the bracket 31 for attaching the secondary injector 26 to the air cleaner box 12 may be formed so as to be positioned between the secondary injector 26 and the air cleaner box 12, the bracket 31 is smaller than conventional mounting parts. .

  Therefore, when the secondary injector 26 is held in the vicinity of the opening end portion of the intake passage, it can be performed by the bracket 31 that is lighter and smaller than the conventional one.

  Further, since the secondary injector 26 is integrally attached to the lid 23 of the air cleaner box 12 and can be removed from the engine 1 side together with the lid 23, the secondary injector attachment member is a throttle valve device as compared with the conventional case. The work to remove from 14 becomes unnecessary. In this way, the secondary injector 26 can be removed together with the lid body 23 by removing the coupler 37 of the fuel pipe assembly 28 upward so that most of the fuel supply system is attached to the vehicle body.

  Furthermore, the fuel supply device 25 according to this embodiment is used for forming the air cleaner box 12 to the minimum necessary size as compared with the conventional fuel supply device in which the secondary injector mounting parts are provided around the air funnel 21. The mounting parts are not restricted. As shown in this embodiment, when the air cleaner box 12 is inserted into the recess 11 inside the fuel tank 10, the air cleaner box 12 is compactly formed as described above, so that the fuel tank The capacity of 10 can be increased as compared with the prior art.

  In addition, since the fuel supply device 25 according to this embodiment can widely open the periphery of the air funnel 21, there is nothing to block the intake air flowing into the air funnel 21, and the intake resistance is reduced as compared with the conventional case. .

  Further, since the bracket 31 for attaching the secondary injector 26 to the air cleaner box 12 has a function of supplying fuel to the secondary injector 26 and a function of supporting the secondary injector 26, the secondary injector 26 is provided in the vicinity of the air funnel 21. Therefore, a member that only supports the secondary injector 26 becomes unnecessary.

  Therefore, the parts used for attaching the secondary injector 26 to the air cleaner box 12 can be reduced as much as possible, and the secondary injector 26 can be attached to the air cleaner box 12 in a more compact manner.

In the embodiment described above, an example in which the secondary injector 26 is attached to the air cleaner box 12 has been described. Can be installed.

  Further, in the above-described embodiment, the fuel supply device 25 in which the primary injector 27 is provided in the throttle valve device 14 and the secondary injector 26 is provided in the air cleaner box 12 is shown. The present invention can also be applied to a fuel supply device that supplies fuel over the entire rotation range.

  As described above, the conventional fuel supply device for a motorcycle engine has a problem in the structure for supporting the secondary injector. This is because columnar brackets and leg members are used to hold the secondary injector in the so-called air.

  That is, these mounting parts increase the weight of the vehicle body and increase the cost, and when the air cleaner box and the throttle valve device are removed from the vehicle body for engine maintenance, the mounting parts are removed each time. This is because the number of work steps increases.

  Furthermore, since a clearance must be provided between the mounting part and the air cleaner box to prevent them from coming into contact with each other, there is also a problem that the air cleaner box is enlarged. When the air cleaner box is inserted into the recessed portion inside the fuel tank, the capacity of the fuel tank is reduced when the air cleaner box is enlarged.

  In addition, the mounting part exists in the inflow path when the intake air flows into the air funnel, and the intake air is blocked by this part, so that there is a problem that the resistance when the intake air flows increases.

  The present embodiment also solves such problems, and simplifies the structure for supporting the secondary injector provided in the vicinity of the opening end of the intake passage.

  The first fuel supply device for a motorcycle engine according to the present embodiment includes an injector disposed at an opening end portion of an intake passage so that an axis thereof is substantially parallel to a center line of the intake passage. In this fuel supply apparatus, the opening end of the intake passage faces the inside of the intake box, and the injector is attached to the intake box.

  According to the first fuel supply device for a motorcycle engine, when the injector is provided in the vicinity of the opening end of the intake passage, the member that extends from the opening end of the intake passage to the upstream side of the intake and supports the injector Is no longer necessary. In addition, since the component for attaching the injector to the intake box may be formed so as to be positioned between the injector and the intake box located in the vicinity thereof, it is smaller than the conventionally used mounting parts. .

  The fuel supply device for a second motorcycle engine according to the present embodiment is a wall facing the opening end of the intake passage in the intake box in the fuel supply device for the first motorcycle engine, It is attached to a wall that can be attached to and detached from the wall through which the intake passage passes.

  According to this fuel supply device, it is not necessary to remove the injector mounting member from the throttle valve device as compared with the conventional fuel supply device.

  A fuel supply device for a third motorcycle engine according to the present embodiment is the first or second motorcycle engine fuel supply device, in which an injector is attached to an intake box via a bracket. A fuel passage for supplying fuel to the inside is formed inside.

  According to this fuel supply device, since the bracket for attaching the injector to the intake box has a function of supplying fuel to the injector and a function of supporting the injector, the injector is provided in the vicinity of the opening end of the intake passage. Therefore, a member that only supports the injector becomes unnecessary.

  As described above, according to the first fuel supply device, when the injector is provided in the vicinity of the opening end of the intake passage, the member that extends from the opening end of the intake passage to the upstream side of the intake and supports the injector Is no longer necessary. In addition, since the component for attaching the injector to the intake box may be formed so as to be positioned between the injector and the intake box located in the vicinity thereof, it is smaller than the conventionally used mounting parts. .

  Therefore, when the injector is held in the vicinity of the opening end portion of the intake passage, an increase in weight can be suppressed as much as possible, and a manufacturing cost can be reduced. Further, since the injector is integrally attached to the intake box and can be removed together with the intake box from the engine side, the number of man-hours for maintenance is reduced.

  Further, since the injector mounting part is not provided between the intake box and the opening end of the intake passage, the intake box can be formed to the minimum size without being restricted by the parts. . In addition, when the intake box is inserted into the recessed portion inside the fuel tank, the capacity of the fuel tank can be increased as compared with the conventional case.

  In addition, since the periphery of the opening end portion of the intake passage can be widely opened, there is nothing to block the intake air flowing into the opening end portion, and the intake resistance is reduced compared to the conventional case and the output of the engine is increased. be able to.

  According to the second fuel supply device, it is not necessary to remove the injector mounting member from the throttle valve device as compared with the conventional case, so that maintenance can be easily performed.

  According to the third fuel supply device, since the bracket for attaching the injector to the intake box has a function of supplying fuel to the injector and a function of supporting the injector, the injector is disposed in the vicinity of the opening end of the intake passage. Therefore, a member that only supports the injector is not necessary. Therefore, the parts used for attaching the injector to the intake box can be reduced as much as possible, and the injector can be attached to the intake box in a more compact manner.

It is a side view of the fuel supply apparatus by this embodiment. It is a figure which expands and shows the principal part. It is a top view of a fuel supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine, 12 ... Air cleaner box, 14 ... Throttle valve device, 21 ... Air funnel, 23 ... Cover body, 25 ... Fuel supply device, 26 ... Secondary injector, 29, 32 ... Fuel rail, 31 ... Bracket, 33 ... Upper part Arm, 33b ... fuel passage, 34 ... lower arm, 37, 38 ... coupler.

Claims (3)

Frame,
An engine mounted on the frame;
An intake passage having an open end and extending rearward and obliquely upward from the engine;
A box-shaped box body connected to the intake passage and disposed above the engine ; and a lid having a wall facing the opening end and closing the opening at the upper end of the box body. An intake box,
A primary injector that is disposed in the intake passage and injects fuel over the entire rotational range of the engine;
A secondary injector disposed on a wall facing the opening end of the intake passage in the lid of the intake box;
Motorcycle equipped with. The motorcycle according to claim 1,
The secondary injector is a motorcycle that injects fuel in a high rotation range of the engine. The motorcycle according to claim 1,
The secondary injector is a motorcycle that injects fuel when the engine is heavily loaded.

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