JP3511349B2 - Motorcycle heat shield - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield device for shielding exhaust heat of a heat exchanger in a motorcycle equipped with a water-cooled engine.

[0002]

2. Description of the Related Art In a motorcycle equipped with a water-cooled engine, a heat exchanger is arranged in front of the engine.
The hot air after heat exchange flows rearward, exposing the occupant to the hot air, or exposing the vaporizer arranged above or behind the cylinder to the hot air.

As a countermeasure against hot air in a conventional heat exchanger, Japanese Patent Publication No. 6-
The technique and the like described in Japanese Patent No. 62104 are disclosed. The technique disclosed in Japanese Examined Patent Publication No. 6-62104 includes a carburetor in the upper rear of the engine cylinder part that leans forward, a heat exchanger is arranged in an upper part in front of the down tube, and a heat shield plate is provided in the rear of the heat exchanger. Arrange.

[0004]

SUMMARY OF THE INVENTION The above-mentioned prior art is a heat shield in which the upper part of a plate-shaped heat shield plate is screwed and fixed to the cross stay between the upper parts of the front part of the vehicle body and tilted backward and downward on the cylinder head. The lower part of the plate is screwed to the vehicle body regardless of the cylinder to cover the front of the carburetor.

Therefore, the heat shield plate is focused on shielding the hot air from the arrangement and structure to the carburetor, and cannot prevent the influence of the hot air on the occupant. Also, since the heat shield plate is tilted backward and is screwed up and down at the left and right of the middle part to the frame side, the shape and structure of the heat shield plate are large due to the influence of running wind because of the large area of the heat shield plate. Not optimal. Furthermore, the structure is complicated, and the mounting structure is troublesome.
Since the heat shield plate is complicated, it is troublesome to remove the heat shield plate at the time of maintenance of the engine cylinder portion where the heat shield plate needs to be removed, and reassembly is also troublesome.

The present invention has been made to solve the above problems of the heat shield plate. The inventor of the present invention has a large engine width when an upright multi-cylinder engine in which the axis of the cylinder is oriented vertically is adopted as the engine of the motorcycle.
There is a possibility that the downward flow of hot air flowing from the heat exchanger can be prevented in the engine cylinder portion. Therefore, there is a possibility that effective hot air cutoff can be performed by preventing the hot air above the engine cylinder portion. The present invention has been made paying attention to the fact that the heat shield plate can be directly attached to the down tube and the engine cylinder portion can be used as a support member for the heat shield plate.

The object of the present invention is to arrange a multi-cylinder upright engine behind a down tube, and to arrange a heat shield plate between the upper part of the down tube and the engine cylinder part, especially the upper part of the cylinder, behind the heat exchanger. In addition, both sides of the heat shield plate are supported by the down tube, the lower part of the heat shield plate is supported by the front part of the engine cylinder, and the heat shield plate with a simple structure provides effective heat shield. The mounting structure can be simple and simple, easy to attach and detach, the maintainability of the upper part of the engine cylinder part is excellent, and the effect of hot air generated by the heat exchanger on the carburetor is reliably prevented, and (EN) Provided is a motorcycle heat shield structure capable of reliably preventing the influence of hot air.

[0008]

In order to solve the above-mentioned problems, a first aspect of the present invention is to dispose a heat exchanger in front of a pair of left and right down tubes extending downward from a head pipe at a front end of a frame, and the down tubes are provided. In a motorcycle equipped with an engine in which a plurality of cylinders that are substantially upright behind each other are arranged in parallel in the left-right direction, a heat shield plate is disposed behind the down tube, and both sides of the heat shield plate are the down tube. Mounted and supported on the upper part of the front part of the cylinder of the engine, and supported by the hot air from the heat exchanger in the engine cylinder part.
Block the downward flow, and the heat shield to block the upward flow of hot air.
It is characterized by having done. In claim 1, the engine
The lower half of the hot air from the heat exchanger is shut off in the cylinder
The upper half of the hot air can be shut off with the occupant, vaporizer, etc.
Isolate from the hot air evenly, the occupants from the heat effect of the hot air,
The vaporizer and the like can be protected. In addition, the heat shield is on both sides
On the down tube and the lower part on the front of the engine cylinder
Therefore, a support having a high supporting rigidity can be obtained.

According to a second aspect, in the first aspect, the shielding
The width of the hot plate is smaller than the width of the engine in the vehicle width direction.
So that both sides of the engine project to the left and right of the heat shield.
The heat shield plate allows the hot air that has passed through the heat exchanger to
Characterized by blocking the flow toward
It is characterized by being asked. In claim 2, the heat shield plate
Means that hot air that has passed through the heat exchanger flows upwards from the engine.
, And guide the hot air downward.

According to a third aspect of the present invention, the heat shield plate according to the first or second aspect is arranged in the upper rear part of the down tube,
Both sides of the heat shield plate were engaged with locking parts provided on the rear surfaces of the left and right down tubes, and the lower part of the heat shield plate was engaged with the locking parts provided on the front part of the cylinder. Oite to claim 3, the heat shield plate is required, the minimum sufficient in size, yet down tube, attached to the cylinder side, the support is, because the relationship of engagement with each other, easy desorption, the engine This is extremely advantageous for maintenance of the upper part of the cylinder.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. FIG. 1 is a side view of a motorcycle, FIG. 2 is a plan view of the same, FIG. 3 is a side view in which a main part of an engine is broken, and FIG. 4 is a side view of a main part showing a positional relationship between a heat exchanger and a heat shield plate. FIG. 5 is a front view showing the positional relationship between the front surface of the heat shield plate and the down tube and the positional relationship with the engine, omitting details, and FIG. 6 is a rear view showing the mounting relationship of the heat shield plate to the down tube and the engine cylinder section. Fig. 7 is an exploded perspective view of the heat shield plate down tube,
And an explanatory longitudinal side view showing the mounting and support relationship to the engine cylinder portion, FIG. 8 is a side view of the front portion of the motorcycle showing the action of the heat shield plate, and FIG. 9 is the heat shield plate and heat shield by the engine cylinder portion. FIG. 10 is a plan view for explaining the operation, and FIG. 10 is an exploded perspective view showing a supporting structure of the headlamp.

In FIG. 1, reference numeral 1 denotes a motorcycle, and a frame 2 extends from a rear portion of a head tube 3 at a front end to a main pipe 4 extending rearward, and a frame extending downwardly from the head tube 3. The left and right down tubes 5 and 5 that are extended, the rear portion of the main pipe 4, and the left and right seat rails 6 that are provided so as to be connected to the rear portions of the down tubes 5 and 5 and extend rearward are provided.

The head tube 3 has front wheels 8 which are steering wheels.
A supporting front fork 7 is rotatably supported, a steering wheel 9 is used for steering, and a rear swing arm 11 supporting a rear wheel 10 is extended rearward through a cushion unit 12 at a rear portion of the down tube 5. To be provided. A headlight 13 and a meter unit 14 are arranged in front of the upper part of the head tube 3, a fuel tank 15 is laid over the main pipe 4, and a seat is arranged on the rear seat rail 6, in the embodiment. A tandem seat 16 is provided, and in FIGS. 1 and 2, reference numeral 17 denotes a rear cowl.

An engine 20 is arranged behind the left and right down tubes 5 and 5 and below the main pipe 4, as shown in FIGS. As shown in FIGS. 3 and 9, the engine 20 is an upright type in which the axis line CL of the cylinder 21 is oriented substantially in the vertical direction. In the embodiment, a 4-cylinder engine is used, and the cylinder 21 ...
Are arranged in parallel on the left and right (vehicle width direction) as shown in FIG.

As shown in detail in FIG. 3, the engine 20 includes a lower crankcase 22, four cylinders 21 provided in parallel thereabove, a cylinder head 23 above the crankcase 22, and the like.
A cylinder head cover 24, an intake port 26 opened and closed by an intake valve 25, and four carburetors 2 for each cylinder connected to the intake port 26.
7, an exhaust port 29 opened and closed by an exhaust valve 28, an exhaust pipe 30 connected to the exhaust port 29, a mission case 31 connected to the rear of the crankcase 22, and the like. The vaporizer 27 ...
It is arranged behind the cylinders 21 ... Above the mission case 31.

The engine 20 is mounted and supported on the down tube 5 side of the frame 2 by the mounting bosses 32 on the upper left and right of the front part of the crankcase 22, the upper left and right mounting bosses 33 and 34 on the lower part of the rear part of the transmission case 31. To be done.
The exhaust pipe 30 passes from the lower side of the engine 20 to the rear side, and is connected via the expansion chamber 37 to the left and right silencers 38 arranged on the left and right sides of the front half of the rear wheel 10.

As shown in FIG. 9, the engine 20 is a four-cylinder engine in which cylinders 21 are arranged side by side and which has a large width in the vehicle width direction, and the crankcase 22 is substantially equal to or slightly smaller than this width. The width is large, and the rear mission case 31 connected to the crankcase 22 also has substantially the same width.

As shown enlarged in FIG. 4, a heat exchanger 40 is provided in front of the upper portions of the left and right down tubes 5, 5.
The heat exchanger 40 faces the front of the head cover 24 above the cylinders 21 to 21 of the engine 20. The heat exchanger 40 is horizontally long and has a fan cover 41 for accommodating a cooling fan 42 at the rear portion thereof. As shown in FIG. 4, a stay 43 at the center of the upper portion is attached between the upper ends of the down tubes, which is not shown in the figure. And the left and right stays 44 at the bottom are attached to the front surfaces of the middle parts of the left and right down tubes 5, 5
Attach it to the frame side and support it by connecting it to the frame with screws.

The planar arrangement of the heat exchanger 40 is as shown in FIG. 9, and the width in the vehicle width direction (horizontal direction) is sufficiently smaller than the width of the engine 20. The heat exchanger 40 is arranged. A space is formed between the head cover 24 of the engine 20 and the main pipe 4, and the heat shield plate 5 is formed so as to close the space above the engine 20.
0 is disposed between the upper portions of the down tubes 5, 5 and between the front heat exchanger 40 and the rear upper surface of the engine 20.

Details of the heat shield plate 50 are as shown in FIGS. 4 to 7 and 9. The heat shield 50 is shown in a perspective view in FIG. 6 in a three-dimensional form, and has a semi-circular arc portion 51 having a widthwise intermediate portion protruding rearward, and extending portions 52, 52 extending left and right thereof. A rear wall portion 53 that hangs downward from the lower wall portion 53, and a recess portion 54 that avoids interference in the relationship with the engine 20 provided on the lower wall portion 53,
55, 55, and a front wall portion 56 erected upward from the front end portion of the semi-circular arc portion 51.

As shown in FIGS. 5 and 6, in the front wall portion 56, the distance between the upper portions of the down tubes 5 and 5 is narrowed in a substantially inverted U shape, and the distance between them is gradually reduced upward. The outer shape is substantially inverted U-shaped, and a recessed portion 57 having a width in the vehicle width direction is provided in an upper middle portion.

Upper and lower engaging holes 58 are provided in portions of the front wall portion 56 which are close to both sides, and the engaging holes 58 ... Are formed at the tips of the mating pins 60 to be engaged as shown in FIG. The head 60a is set to a shape that is lightly press-fitted and engaged. On the left and right sides of the lower end portion of the rear wall portion 53, shaft-like engagement protrusions 59, 59 having a diameter-expanded portion 59a at the middle portion in the height direction are provided so as to hang down.

The heat shield plate 50 is made of a rubber material having a strong elasticity, a resin material having a high elasticity, or the like, and all the parts are integrally formed. still,
On the left and right of the upper part of the heat shield plate 50, there are engaging holes 5 for the headed pins 60.
It is attached and supported by engaging with a light press fit through 8, and the lower portion of the heat shield plate 50 has an engaging projection 5 that hangs downward.
The heat shield plate 50 can be easily attached and detached because it is attached and supported by the engagement of the light-expanded portion 59a of the engine cylinder portion to the engagement hole 36 in the upper front portion of the engine cylinder portion.

Therefore, from the upper part of the engine cylinder portion, the heat shield plate 5
0 can be easily attached and detached, and during engine maintenance, it is possible to avoid the difficulty of maintenance by the heat shield plate 50, and also in terms of engine maintenance, to obtain a heat shield plate with excellent maintainability. You can

An upper portion 5b, which is gradually narrowed toward the upper side of the down tubes 5 and 5 and constitutes a gate-shaped portion,
Pins 60 ... Having heads 60a respectively on the top and bottom are provided on the rear surface (the surface facing the engine) of 5b so as to project rearward. Locking holes 58 provided on the left and right of the front wall portion 56 of the upper half of the heat shield plate 50 ... Front faces the pins 60, and both sides of the heat shield plate 50 are pressed forward and locked. Hole 60 ... Pin 60 ...
Engage.

On the other hand, support boss portions 35, 35 are provided in the front portion of the upper portion of the cylinder 21 portion of the engine 20 so as to be separated from each other in the left and right directions, and the boss portions 35, 35 are provided with vertical engaging holes, respectively. Three
6,36 are drilled. The engaging projections 59, 59 hung downward from both sides of the lower end portion of the rear wall portion 53 of the heat shield plate 50,
The engaging projections 59, 59 are inserted into the engaging holes 36, 36 in a manner that they are lightly press-fitted from above, and the enlarged diameter portion 59a is caught by the upper ends of the engaging holes 36, 36 so that the engaging projections 59, 59 do not come off. The upper engaging holes 36, 36 are engaged.

FIG. 7 shows the engagement state of the heat shield plate 50 with the down tubes 5, 5 and the upper front part of the engine cylinder.
As shown in FIG. 5, a gusset 3a having a substantially triangular shape in a front view is provided between the upper portions near the upper ends of the left and right down tubes 5, 5 and between the head pipe 3 and the gusset 3a. Interference with the upper half of the heat shield plate 50 is avoided by the recessed portion 57 provided in the middle portion of the front wall portion 56 of the heat shield plate 50.

As described above, the heat shield plate 50 is provided behind the head tubes 5 and 5, behind the heat exchanger 40, and in the engine 2.
It is arranged in front of the upper part of 0. As shown in FIG. 9, the heat shield plate 50 is disposed in the rear of the upper half of the heat exchanger 40 so as to be separated in the front-rear direction with a width substantially equal to the width of the heat exchanger 40.
0 is located above the cylinder 21 of the engine 20 to the front of the cylinder head cover 24.

The upper half of the circular fan cover 42 of the heat exchanger 40 faces a space in front of the above-mentioned semi-circular arc portion 51 of the heat shield plate 50. As shown in FIG. 9, the heat shield plate 50 has a width slightly smaller than the width of the engine 20 in the vehicle width direction, and both side portions 20a, 20a of the engine 20 are
The heat shield plate 50 protrudes to the left and right by a predetermined width.

In the above, the hot air of the heat exchanger 40 is exhausted rearward by the driving of the cooling fan 42, and is exhausted rearward at a flow velocity by traveling. Since the heat shield plate 50 is disposed above the front part of the engine 20, the hot air passing through the heat exchanger 40 flows upwards of the engine 20 as indicated by the arrow shown in the operation diagram of FIG. Is blocked and is guided downward.

As the heat shield plate 50 is guided downward, the hot air collides with the front surface of the cylinder 21 portion of the engine 20 and the front surface of the crankcase 22 portion below this as shown by the arrows in FIGS.
It splits into left and right, and branches into both sides below the engine to flow. As a result, the hot air does not wrap around above the engine, and the engine cylinder portion-crankcase portion functions as a screen and branches in both directions below the engine, and the carburetor 27 is not affected by the hot air, and the occupant is of course affected. To prevent the effect of hot air on.

As described above, by mounting and supporting the heat shield plate 50 directly on the down tube or directly on the upper front surface of the engine cylinder, the heat shield plate 50 can be reliably mounted and supported by a simple mounting structure. The structure of the heat shield plate 50 need only be simple as it has a function of closing the upper part of the engine and rectifying the hot air downward and sideways.

FIG. 10 shows a support structure for a headlight. The upper and lower bridges 71, 72 so that the head pipe 3 is vertically sandwiched.
The left and right mounting boss portions 71a, 71a, 72a, 72a of the upper and lower bridges 71, 72 hold the upper portions of the left and right members of the front fork 7, and the steering shaft 73 is provided at the center of the bottom bridge 72. The head pipe 3 is erected and installed, rotatably fitted to the head pipe 3, and the upper end screw portion 73a of the steering shaft 73 is coupled to the central portion of the top bridge 71 with a nut 74.

Left and right headlamp holding brackets 75, 75
Has a substantially triangular shape that protrudes forward when viewed from the side, and is made of a die-cast product such as an aluminum alloy.
A leg portion 75b is hung by welding or the like at the rear edge portion of a, 75a, and engaging portions 75c, 75c at the lower end portion are provided on the left and right sides of the bottom bridge 72 via the collar 76.
2a to engage the legs 75b and 75b with the bottom bridge 7
Have 2 support.

An upper mounting boss portion 75d bent inward is provided at the upper rear end portion of each plate-shaped portion 75a.
Mounting holes 7 provided with 5d on the front left and right of the top bridge 71
The screws 1a and 71a are screwed together via bolts 77. Mounting holes 78 and 79 are provided in the upper and lower ends of the plate-shaped portions 75a of the brackets 75 and 75, and the upper portion 78 of the mounting holes includes the sticker of the left and right turn signal lamps 18 from the outside. The end portions of 18a are brought into contact with each other, and the bolts are passed through the inside of the plate-shaped portion 75a to attach and support the left and right winker lamps 18.

The plate-like portion 75 of each bracket 75, 75
The bosses 13a provided on both sides of the headlight 13 are exposed to the inner side between the mounting holes 79, 79 of the front portions of the a, 75a, and the bolts 80 are screwed from the outer side between the brackets 75, 75. A lamp 13 was attached and supported.

[0037]

The present invention has the following effects due to the above configuration. According to the first aspect of the present invention, the heat exchanger is arranged in front of a pair of left and right down tubes extending downward from the head pipe at the front end of the frame, and a plurality of cylinders that are substantially upright behind the down tubes are arranged in parallel in the left and right direction. In a motorcycle having an engine arranged, a heat shield plate is arranged behind a down tube, and both sides of the heat shield plate are attached to and supported by the down tube, and a lower part thereof is on a front part of a cylinder of the engine.
Parts to the mounting and support, the heat from the heat exchanger in the engine cylinder section
Blocks the downward flow of wind and blocks the upward flow of hot air with a heat shield.
As a result, it is possible to block the downward flow of hot air from the heat exchanger in the engine cylinder section and to block the upward flow of hot air from the heat shield plate, and to block passengers, vaporizers, etc. from the hot air evenly.
It is possible to protect an occupant, a carburetor, etc. from the heat effect of hot air.

In particular, according to the present invention, the engine is a multi-cylinder engine, the cylinder is an upright type, and a shielding plate is provided on the front upper part of the cylinder so that the cylinders are aligned in the vehicle width direction. By closing the gap between the frame and the frame, it is possible to reliably prevent the hot air from exhausting through the upper part of the engine, and use the width of the engine in the vehicle width direction to use it as a screen.
We rectify the hot air as a flow to the side of the engine and to the rear,
The influence of the hot air of the heat exchanger on the carburetor and the occupant behind the engine can be prevented as much as possible.

Further, according to the present invention, the engine including the engine cylinder portions arranged in parallel in the vehicle width direction is used as a screen, so that the heat shield plate is installed between the upper portion of the engine and the frame, and is arranged along the inclination of the down tube. A simple, almost vertical structure is sufficient, the size of the heat shield plate itself is small, and a simple structure is enough. A heat shield plate with a simple structure and a high heat shield effect in combination with the engine Obtainable. In addition, shielding
Both sides of the hot plate are attached to and supported by the down tube.
Since it is mounted and supported on the upper front part of the engine cylinder part,
High rigidity can be obtained.

According to a second aspect, in the first aspect, the shielding
The width of the hot plate is smaller than the width of the engine in the vehicle width direction.
So that both sides of the engine project to the left and right of the heat shield.
The heat shield plate allows the hot air that has passed through the heat exchanger to
Since it tried to block the flow toward,
That hot air that has passed through the heat exchanger flows above the engine
Block and guide the hot air down.

[0041] Oite to claim 3, claim 1 or claim
In 2 , the heat shield plate is disposed behind the upper portion of the down tube, and both side portions of the heat shield plate are engaged with the locking portions provided on the left and right down tube upper rear faces, and the lower portion of the heat shield plate is attached to the cylinder. Since it engaged with the locking part provided on the upper part of the front part, a heat shield plate is necessary,
The minimum size is sufficient, and since the down tube, mounting on the cylinder side, and support are in mutual engagement, they can be easily attached and detached, and they can be easily attached and detached during engine maintenance, which is extremely advantageous for maintenance. Is.

[Brief description of drawings]

[Fig. 1] Side view of a motorcycle

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view in which an essential part of the engine is cut away.

FIG. 4 is a side view of a main part showing a positional relationship between a heat exchanger and a heat shield plate.

FIG. 5 is a positional relationship between the front surface of the heat shield plate and the down tube,
Front view omitting details showing the positional relationship with the engine

FIG. 6 is an exploded perspective view of a rear surface showing a mounting relationship between the heat shield plate and the down tube and the engine cylinder portion.

FIG. 7 is an explanatory vertical sectional side view showing a mounting relationship between a heat shield plate and a down tube and an engine cylinder portion.

FIG. 8 is a side view of the front portion of the motorcycle showing the action of the heat shield plate.

FIG. 9 is a plan view for explaining a heat shield effect of a heat shield plate and an engine cylinder portion.

FIG. 10 is an exploded perspective view showing a supporting structure of a headlight.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 3 ... Head pipe, 5 ... Down tube, 20 ... Engine, 21 ... Cylinder, 40 ... Heat exchanger, 50 ... Heat shield plate.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference Japanese Unexamined Patent Publication No. 9-24253 (JP, A) Actually opened 57-182584 (JP, U) Actually opened 61-190785 (JP, U) Actually opened 63- 4793 (JP, U) Actual Kai 2-57793 (JP, U) Japanese Patent 6-62104 (JP, B2) Japanese Patent 54-65942 (JP, B1) Japanese Patent 56-25021 (JP, B1) Japanese Patent Publication Sho 63-101185 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62M 7/02 B62J 23/00 F16L 59/02

Claims (3)

(57) [Claims] 1. A heat exchanger is arranged in front of a pair of left and right down tubes extending downward from a head pipe at a front end of a frame, and a plurality of cylinders which are substantially upright behind the down tubes are arranged in parallel in the left-right direction. In a motorcycle having an engine arranged, a heat shield plate is disposed behind the down tube, and both sides of the heat shield plate are attached to and supported by the down tube, and a lower portion thereof is in front of a cylinder of the engine. Mounted and supported on the upper part of the engine, shuts down the downward flow of hot air from the heat exchanger in the engine cylinder
A heat shield device for a motorcycle, characterized in that the heat shield plate blocks the upward flow of hot air . 2. The heat shield plate is the width of the engine in the vehicle width direction.
The width is smaller than that of the heat shield plate on both sides of the engine.
So that it protrudes to the left and right, and use the heat shield to pass through the heat exchanger.
To prevent hot air from flowing above the engine.
The heat shield device for a motorcycle according to claim 1, wherein
Place 3. The heat shield plate is disposed rearward of an upper portion of the down tube, and both side portions of the heat shield plate are engaged with locking portions provided on left and right upper portions of the down tube to secure the heat shield plate. The heat shield device for a motorcycle according to claim 1 or 2 , wherein a lower portion is engaged with a locking portion provided on an upper portion of the cylinder front portion.