JP2009202808A - Fuel pump arrangement structure in motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel pump arrangement structure in a motorcycle which is hardly heat-affected, and capable of realizing the low center of gravity, and enhancing the degree of versatility of the layout design. <P>SOLUTION: The fuel pump arrangement structure in the motorcycle comprises a main frame for supporting a vehicle body component such as an engine and a fuel tank, a pair of right and left center frames extending vertically behind the engine, a pair of right and left swing arms oscillating around a pivot provided on the center frames, and a cushion with its lower end being supported by a cross frame connecting the right and left swing arms, and a fuel pump is arranged outside the fuel tank. The fuel pump is arranged between a transmission of the engine and the cushion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel pump arrangement structure for a motorcycle in which a fuel pump is arranged outside a fuel tank.

A motorcycle is known in which a fuel pump is disposed outside a fuel tank. In some motorcycles, a fuel pump is disposed behind the engine in a main frame (body frame) that supports the engine (see, for example, Patent Document 1).
JP-A-2005-096504

  However, when the fuel pump is disposed in the main frame and behind the cylinder head of the engine, the fuel pump is disposed at a position close to the engine, so that it is necessary to take measures against heat. Further, since the fuel pump is relatively heavy, it is preferable to dispose the fuel pump below the vehicle body in order to achieve a low center of gravity of the vehicle body. Furthermore, since other vehicle body components are arranged in the vicinity of the engine, they must be arranged in a limited space, and the degree of freedom in layout design is low.

  The present invention has been made in view of the circumstances described above, and is a fuel pump arrangement structure for a motorcycle that is less susceptible to heat, has a lower center of gravity, and can increase the degree of freedom in layout design. The purpose is to provide.

In order to solve the above-described problems, the present invention is provided with a main frame that supports vehicle body components such as an engine and a fuel tank, a pair of left and right center frames that extend up and down behind the engine, and the center frame. An automatic 2 comprising a pair of left and right swing arms swingable about a pivot shaft, and a cushion having a lower end supported by a cross frame connecting the left and right swing arms, and a fuel pump disposed outside the fuel tank In the fuel pump arrangement structure of the wheeled vehicle, the fuel pump is arranged between the transmission of the engine and the cushion.
The fuel pump may be disposed between the pivot shaft and the cross frame.

The fuel pump may be disposed between the left and right center frames.
A fuel pump may be disposed between the left and right arms of the swing arm.

It is also possible to provide a catalyst in the middle part of the exhaust pipe extending in the longitudinal direction of the vehicle body, arrange a fuel pump on the side of the catalyst, and provide a heat shield cover between the fuel pump and the catalyst.
The heat shield cover includes a first heat shield cover that covers a part of the catalyst, and a second heat shield cover that is interposed between the catalyst or the exhaust pipe and the fuel pump and supports the fuel pump. And may be configured.
Furthermore, a support member for attaching the fuel pump to the vehicle body may be configured as the heat shield cover.

  On the other hand, the axis of the cushion and the axis of the fuel pump may be arranged substantially in parallel.

  A fuel pump arrangement structure for a motorcycle according to the present invention includes a main frame that supports vehicle body components such as an engine and a fuel tank, a pair of left and right center frames that extend up and down behind the engine, and the center A pair of left and right swing arms swingable about a pivot shaft provided on a frame, and a cushion having a lower end supported by a cross frame connecting the left and right swing arms, and a fuel pump outside the fuel tank The fuel pump arrangement structure of the motorcycle is arranged, and the fuel pump is arranged between the transmission of the engine and the cushion, so that the lower end of the cushion is supported by the cross frame. A fuel pump is placed in the empty space in front of the cushion, and it is necessary to take measures against the engine heat behind the engine. It is possible to effectively utilize the have space. In addition, since the space can be used effectively, the degree of freedom in design layout is high. Furthermore, since the fuel pump can be disposed below the vehicle body, a low center of gravity can be realized.

  Further, since the fuel pump is disposed between the pivot shaft and the cross frame, space can be used effectively and the degree of freedom in design layout is increased. Furthermore, since the fuel pump can be disposed below the vehicle body, a low center of gravity can be realized.

Further, since the fuel pump is disposed between the left and right center frames, the fuel pump is surrounded by the left and right center frames and the cross frame, and the fuel pump can be protected from the outside.
Similarly, by disposing the fuel pump between the left and right arms of the swing arm, the fuel pump can be protected from the outside by being surrounded by the left and right center frames and the cross frame. In addition, space can be used effectively and a low center of gravity can be realized.

  Furthermore, a catalyst is provided in the middle of the exhaust pipe extending in the longitudinal direction of the vehicle body, a fuel pump is disposed on the side of the catalyst, and a heat shield cover is provided between the fuel pump and the catalyst. It can be made hard to receive the heat influence from a catalyst. In addition, the space can be effectively utilized by allowing the catalyst and the fuel pump to coexist in the space. Furthermore, a low center of gravity can be realized by arranging the catalyst below the vehicle body.

  The heat shield cover includes a first heat shield cover that covers a part of the catalyst, and a second heat shield cover that is interposed between the catalyst or the exhaust pipe and the fuel pump and supports the fuel pump. Therefore, the space can be effectively utilized by providing the two functions of the fuel pump support member and the heat shield cover.

  Further, since the support member for attaching the fuel pump to the vehicle body side is configured as the heat shield cover, it is not necessary to provide the support member and the heat shield cover, and the number of parts can be reduced.

  On the other hand, since the axis of the cushion and the axis of the fuel pump are arranged substantially in parallel, the appearance can be improved and an optimum design layout can be realized.

  Hereinafter, a fuel pump arrangement structure of a motorcycle according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a left side view showing an off-road motorcycle 1 according to an embodiment of the present invention. The directions used in the following description are based on FIG. 1. The vertical direction of the vehicle is the vertical direction of FIG. 1, the horizontal direction of the vehicle is the depth direction of FIG. 1, and the longitudinal direction of the vehicle is the plane of FIG. Left and right direction. In FIG. 1, a side cover and a shroud covering the outer side of the vehicle body are omitted for ease of explanation.

  As shown in FIG. 1, the body frame 2 of the motorcycle 1 includes a main frame 10 that extends obliquely downward and rearward from the head pipe 3, and a head frame 3 that extends downward from the head pipe 3. A down tube 20A extending to the bottom, a pair of left and right lower pipes 20B and 20B extending rearwardly below the vehicle body, and a rear end of the main frame 10 and a rear end of the lower pipes 20B and 20B. A pair of left and right center frames 30L and 30R (the left side is 30R and the right side is 30L) are provided. The body frame 2 constitutes a cradle type frame, and an engine 4 is suspended inside the body frame 2 via an engine hanger.

  Rear frames 40, 40 extending rearward of the vehicle body are attached to the center frames 30L, 30R. The rear frame 40 includes a pair of left and right pipes 40A and 40A extending from the lower part of the center frames 30L and 30R toward the rear upper side of the vehicle body, and a pair of left and right pipes 40B and 40B extending from the upper part of the center frames 30L and 30R to the rear of the vehicle body. It consists of and. The rear ends of the pipes 40A and 40B are connected to each other, and a seat 57, a rear fender 58, and a side cover (not shown) are attached to the pipes 40A and 40B.

  A pair of left and right front forks 61 that pivotally support the front wheel 60 is provided below the head pipe 3. A top bridge 64 to which an operation handle 63 is fixed is connected to the upper side of the head pipe 3. A front fender 65 is attached to the lower side of the head pipe 3 so as to cover the upper part of the front wheel 60.

  The center frame 30 has a curved portion 30A on the lower side, and a pivot shaft 32 penetrating in the left-right direction of the vehicle body is provided in the curved portion 30A. The pivot shaft 32 supports a front end of a swing arm 71 that pivotally supports the rear wheel 70 so as to swing up and down. A drive chain 74 is wound around a sprocket 72 provided on the rear wheel 70 and a sprocket 73 provided on the output shaft 5A of the engine 4, and the driving force of the engine 4 is applied to the drive chain 74. To the rear wheel 70.

  A cross member (not shown) for connecting the center frames 30L and 30R to the left and right is provided below the bending portion 30A. The frame side bracket 33 is provided at the center in the width direction of the cross member 79. Is attached, and a stand is attached to the frame side bracket 33.

  The swing arm 71 includes a pair of left and right arms 92 a and 92 b that extend from the pivot shaft 32 in the vehicle rearward direction and straddle the rear wheel 70. The left and right arms 92a and 92b are connected by a cross frame 71a (see FIGS. 2 and 4) at the front part of the rear wheel. A support portion 71b is provided at the upper end of the cross frame 71a, and the lower portion of the rear cushion 80 is rotatably attached to the support portion 71b. Moreover, the upper part of the rear cushion 80 is provided in the upper part of the center frame 30, and is rotatably attached to the cushion support part.

  Further, a gear change pedal 34 is provided in front of the curved portion 30 </ b> A and in the vicinity of the lower side portion of the engine 4.

  The engine 4 includes a crankcase 5 (transmission), a cylinder block 6 extending substantially upward from the front portion of the crankcase 5, and a cylinder head 7 connected to the upper portion of the cylinder block 6. This is a single cylinder engine having one cylinder in the block 6. In the cylinder block 6, a piston is accommodated in the cylinder so as to be reciprocally movable. The crankcase 5 is supported by a crankshaft connected to the piston via a connecting rod and an output shaft 5A of the engine, and constitutes a power transmission mechanism between the crankshaft and the output shaft 5A. A clutch mechanism, a transmission mechanism, and the like are accommodated.

  Further, a starting motor (an engine accessory, not shown) is disposed behind the engine 4 and in front of the center frames 30L and 30R.

  The cylinder head 7 houses an intake / exhaust valve that opens and closes an intake / exhaust passage communicating with a cylinder in the cylinder block 6, and an intake port 7 </ b> A of the intake / exhaust passage is formed on the back surface of the cylinder head 7. A throttle body 8 is connected to the intake port 7A via a cone tube, and an air cleaner box 9 located below the seat 57 is connected to the throttle body 8. The cylinder head 7, the throttle body 8, and the air cleaner box 9 are arranged substantially linearly so as to improve the intake efficiency.

  An exhaust port 7 </ b> B of an intake / exhaust passage is formed in the front surface of the cylinder head 7. An exhaust pipe 50 is connected to the exhaust port 7B. The exhaust pipe 50 extends forward from the exhaust port 7B, bends to the right side of the cylinder head 7, and extends to the vehicle rear side on the right side of the vehicle (see FIG. 2 for details). An exhaust muffler 51 is connected to the extended end of the exhaust pipe 50.

  A fuel tank 56 is disposed above the cylinder head 7 and in front of the seat 57. A fuel pump 81 is connected to the fuel tank 56 via a fuel pipe 59. Note that in the motorcycle according to the present embodiment, a fuel pump 81 is disposed outside the fuel tank 56. Details of the arrangement of the fuel pump 81 will be described later.

  FIG. 2 is a diagram of the motorcycle viewed from above, and is a schematic diagram showing the mounting position of the fuel pump. In the drawing, the cylinder block 6 and the cylinder head 7, the fuel tank 56, the rear cushion 80, the air cleaner box 9, and the throttle body 8 of the engine 4 are omitted for easy explanation.

  In FIG. 2, from the rear part of the main frame 10 extending in the front-rear direction in the vehicle body width direction, two center frames 30L and 30R extending downward in a manner branching left and right, and 2 extending rearward in a manner branching left and right. The pipe 40B extends. A pipe 40A extending rearward from the left and right center frames 30L, 30R extends below the pipe 40B. Further, a swing arm 71 extends from the pivot shaft 32 in a mode of connecting the center frames 30L and 30R to the rear of the vehicle body.

3 is a perspective view showing the positional relationship between the fuel pump 81, the rear cushion 80, and the exhaust pipe 50. As shown in FIG. In FIG. 3, the left side of the page is the front of the vehicle. FIG. 4 is a perspective view of the positional relationship between the fuel pump 81 and the swing arm 71 as seen from the oblique rear side of the vehicle. In FIG. 4, the diagonally upper right side of the page is the front of the vehicle.
The fuel pump 81 has a substantially cylindrical outer shape, and is provided with two fuel pipes 59 a connected to the fuel tank 56 and a fuel pipe 59 b connected to the throttle body 8.

  As shown in FIG. 2, the position of the fuel pump 81 in the vehicle front-rear direction is disposed rearward of the crankcase 5 and in front of the rear cushion 80. More specifically, the fuel pump 81 is disposed on the rear side of the pivot shaft 32 and on the front side of the cross frame 71 a of the swing arm 71. As shown in FIG. 3, the axis L2 of the fuel pump 81 is disposed substantially parallel to the axis L1 of the rear cushion 80, so that no space is wasted.

  Further, the position of the fuel pump 81 in the vehicle width direction is arranged between the left and right center frames 30L and 30R as shown in FIG. More specifically, the fuel pump 81 is disposed between the left and right arms 92 a and 92 b of the swing arm 71.

  Further, the position of the fuel pump 81 in the vehicle height direction is arranged at a position substantially the same as the lower portion of the rear cushion 80 as shown in FIG.

  That is, the fuel pump 81 is disposed in a space on the front side of the rear cushion 80 formed by attaching the attachment portion at the lower part of the rear cushion 80 to the cross frame 71 a of the swing arm 71. Thereby, the space is effectively used.

  On the other hand, the exhaust pipe 50 is routed around the right side of the vehicle body as described above (see FIG. 2), and a catalyst needs to be provided in the middle of the exhaust pipe 50. The size and volume of this catalyst need to be larger than before due to recent exhaust gas regulations. In the present embodiment, as shown in FIG. 2, a catalyst 90 is provided between the pivot shaft 32 and the rear end of the cross frame 71a in the front-rear direction, which is an intermediate portion of the exhaust pipe 50 extending in the front-rear direction of the vehicle body. ing.

When the fuel pump 81 is arranged at such a position, the distance between the catalyst 90 and the fuel pump 81 described above is shortened, and there is a concern about the influence of heat on the fuel pump 81. Therefore, the catalyst 90 is provided with a first heat shield cover 91 so as to cover the substantially cylindrical outer periphery (see FIG. 2).
The exhaust pipe 50 on the front side of the catalyst 90 is provided with a cover member 93 for preventing the exhaust pipe 50 from appearing outside the vehicle.

Further, as shown in FIG. 4, a fuel pump support member 96 is attached to the outer peripheral surface of the fuel pump 81 in the circumferential direction. On the other hand, a hanger bracket 95 is attached to the cross member 94 that connects the left and right center frames 30L and 30R.
A bracket 97 is attached to the right side portion (portion where the catalyst 90 extends) of the fuel pump support member 96 so as to extend obliquely outward and forward, and between the front end of the bracket 97 and the hanger bracket 95. Is supported by a second heat shield cover 98. The second heat shield cover 98 is fixed to the front end of the bracket 97 with a bolt 82, and is fixed to the hanger bracket 95 by welding. A pump bracket 85 for attaching the fuel pump support member 96 to the vehicle body is attached to the left side portion of the fuel pump support member 96 (see FIG. 3). The pump bracket 85 connects the left and right center frames 30L and 30R. The cross member 94 is attached to a flange portion 86 (see FIG. 5) by bolts 87 (see FIG. 3). The pump bracket 85 has a function as an engine hanger. Specifically, as shown in FIG. 3, a mounting hole 88 is provided on the lower front side of the vehicle body, and the engine 4 is suspended using the mounting hole 88. That is, the engine 4 is suspended by the hanger bracket 95 and the pump bracket 85.

  As described above, the second heat shield cover 98 functions as a strength member that supports the fuel pump 81, and also functions to make it difficult for heat from the catalyst 90 to be transmitted to the fuel pump 81. Therefore, as shown in FIG. 4, the second heat shield cover 98 is formed longer on the upper side than the length of the bracket 97 in the height direction, and shields heat transmitted to the fuel pump 81 in a larger area. It is possible to heat.

FIG. 5 is an external perspective view of the mounting position of the second heat shield cover 98 as viewed from the oblique front side of the vehicle.
The exhaust pipe 50 (the front side of the center frame 30 is omitted in FIG. 5) is routed inward of the vehicle body from the center frame 30R on the right side of the vehicle body (see FIG. 2). The second heat shield cover 98 is disposed between the exhaust pipe 50 and the fuel pump 81 (not shown in FIG. 5). The outer surface 98a of the second heat shield cover 98 is directed toward the outside of the vehicle, that is, toward the exhaust pipe 50 or the catalyst 90.

  The fuel pump 81 includes a joint (not shown) that protrudes in the lateral direction and is attached with the fuel pipe 59b, and a joint (not shown) that protrudes in the upward direction and is attached with the two fuel pipes 59a. Yes. As a result, the fuel stored in the fuel pump 81 is sent to the throttle body 8 via the fuel pipe 59b. Further, the fuel in the fuel tank 56 is sent into the fuel pump 81 through the fuel pipe 59a. The fuel pump 81 also functions as a fuel auxiliary tank.

  According to the fuel pump arrangement structure of the motorcycle according to the embodiment of the present invention, the fuel pump 81 is disposed between the rear end portion of the crankcase 5 of the engine 4 and the rear cushion 80, and the pivot shaft 32. The fuel pump 81 is disposed in the empty space on the front side of the rear cushion 80, which is formed by supporting the lower end of the rear cushion 80 on the support portion 71b of the cross frame 71a. A space behind the engine 4 that does not require heat countermeasures for the engine 4 can be used effectively. In addition, since the space can be used effectively, the degree of freedom in design layout is high. Furthermore, since the fuel pump 81 can be disposed below the vehicle body, a low center of gravity can be realized.

  Further, since the fuel pump 81 is disposed between the left and right center frames 30L and 30R and between the left and right arms 92a of the swing arm 71, the left and right center frames 30L and 30R and the cross frame 71a Thus, the fuel pump 81 can be protected from the outside. In addition, the space can be effectively utilized, and the low center of gravity can be realized by arranging the fuel pump 81 at a low position of the vehicle body.

  Further, a catalyst 90 is provided at an intermediate portion of the exhaust pipe 50 extending in the longitudinal direction of the vehicle body, and a fuel pump 81 is disposed on the side of the catalyst 90. Since the first heat insulating cover 91 and the second heat insulating cover 98 are provided, the heat influence from the catalyst 90 or the exhaust pipe 50 can be reduced. In addition, the space can be effectively used by allowing the catalyst 90 and the fuel pump 81 to coexist in a nearby space. Furthermore, the center of gravity can be lowered by arranging the catalyst 90 whose volume has been increased by the exhaust gas regulation below the vehicle body.

  A part of the catalyst is covered with a first heat shield cover, and a second heat shield cover 98 is interposed between the catalyst 90 or the exhaust pipe 50 and the fuel pump 81, and the fuel is covered with the second heat shield cover 98. Since the pump 81 is supported, the space can be effectively utilized by providing the second heat shield cover 98 with two functions of the support member of the fuel pump 81 and the heat shield cover.

  Further, since the support member for attaching the fuel pump 81 to the vehicle body side is configured as the second heat shield cover 98, the fuel pump 81 can be supported by the second heat shield cover 98, and it is necessary to provide a support member. There is no. Therefore, the number of parts can be reduced.

  Furthermore, since the axis of the rear cushion 80 and the axis of the fuel pump 81 are arranged substantially in parallel, the appearance can be improved and an optimum design layout can be realized.

While the embodiments of the present invention have been described above, various modifications and changes can be made based on the technical idea of the present invention.
For example, in the present embodiment, two heat shield covers are provided between the fuel pump 81 and the catalyst 90 or the exhaust pipe 50. However, if the heat transfer can be reliably prevented, one heat shield cover is provided. You may comprise with a thermal-insulation cover. As a result, the heat transmitted from the catalyst 90 can be shielded by the heat shield cover so that the fuel pump 81 is not affected by heat. Further, by arranging the fuel pump 81 and the catalyst 90 at substantially the same height below the vehicle body, a low center of gravity can be realized.

1 is a left side view of a motorcycle according to an embodiment of the present invention. It is the figure which looked at the motorcycle of FIG. 1 from the upper side, Comprising: It is the schematic diagram which shows the attachment position of a fuel pump. It is an external appearance perspective view which shows the positional relationship of a fuel pump and a cushion. It is an external appearance perspective view which shows the positional relationship of a fuel pump and a swing arm. It is a schematic diagram which shows the attachment position of a 2nd thermal insulation cover.

Explanation of symbols

1 Motorcycle 2 Body frame 3 Headpipe 4 Engine 5 Crankcase (transmission)
7B Exhaust port 10 Main frame 20A Down tube 20B Lower pipe 30 Center frame 30A Curved portion 32 Pivot shaft 40 Rear frame 40A, 40B Pipe 50 Exhaust pipe 51 Exhaust muffler 56 Fuel tank 59 Fuel piping 60 Front wheel 70 Rear wheel 71 Swing arm 71a Cross frame 71b Support portion 80 Rear cushion 81 Fuel pump 82 Bolt 90 Catalyst 91 First heat shield cover 92a Arm 93 Cover member 94 Cross member 95 Hanger bracket 96 Fuel pump support member 97 Bracket 98 Second heat shield cover 98a Outer surface L1, L2 Axis

Claims (8)

A main frame that supports vehicle body components such as an engine and a fuel tank, a pair of left and right center frames extending up and down behind the engine, and a pair of left and right swingable about a pivot shaft provided on the center frame A fuel pump arrangement structure for a motorcycle comprising a swing arm and a cushion having a lower end supported by a cross frame connecting the left and right swing arms, and a fuel pump arranged outside the fuel tank,
A fuel pump arrangement structure for a motorcycle, wherein the fuel pump is arranged between a transmission of the engine and the cushion.   The fuel pump arrangement structure for a motorcycle according to claim 1, wherein the fuel pump is arranged between the pivot shaft and the cross frame.   The fuel pump arrangement structure for a motorcycle according to claim 1 or 2, wherein the fuel pump is arranged between the left and right center frames.   The fuel pump arrangement structure for a motorcycle according to claim 3, wherein a fuel pump is arranged between the left and right arms of the swing arm.   A catalyst is provided in an intermediate portion of an exhaust pipe extending in the longitudinal direction of the vehicle body, a fuel pump is disposed on a side of the catalyst, and a heat shield cover is provided between the fuel pump and the catalyst. The fuel pump arrangement structure for a motorcycle according to any one of claims 1 to 4.   The heat shield cover includes: a first heat shield cover that covers a part of the catalyst; and a second heat shield cover that is interposed between the catalyst or the exhaust pipe and the fuel pump and supports the fuel pump. 6. The fuel pump arrangement structure for a motorcycle according to claim 5, wherein the fuel pump arrangement structure is configured.   The fuel pump arrangement structure for a motorcycle according to claim 5 or 6, wherein a support member for attaching the fuel pump to a vehicle body is configured as the heat shield cover.   The fuel pump arrangement structure for a motorcycle according to any one of claims 1 to 7, wherein an axis of the cushion and an axis of the fuel pump are arranged substantially parallel to each other.

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