JP2002205675A - Motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the center-of-gravity of a motorcycle while securing the capacity of a fuel tank in the motorcycle equipped with a V-type engine having a front cylinder and a rear cylinder. SOLUTION: In this motorcycle 10, the V-type engine 16 having a front cylinder 41 and a rear cylinder 42 is mounted to the nearly center in the longitudinal direction of a body frame 11, and a swing arm 51 with a rear wheel 19 is mounted to the rear part of the body frame 11. The fuel tank 22 is mounted to the upper part of the body frame 11. The fuel tank 22 is arranged between the rear wheel 19 and the rear cylinder 42. A longitudinal fuel supply pump 23 is built in the fuel tank 22. A seat 25 is arranged above the fuel supply pump 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the arrangement of a V-type engine, a fuel tank, a fuel supply pump and a seat in a motorcycle.

[0002]

2. Description of the Related Art As a motorcycle equipped with a V-type engine, for example, Japanese Patent No. 3093464 discloses a "fuel supply device" (hereinafter referred to as "prior art").
In this prior art, as shown in FIGS. 3 and 4 of the publication, a front cylinder 11 and a rear cylinder 11 are provided at substantially the center of the longitudinal direction of a main frame 10 (numbers quoted in the publication. The same applies hereinafter). A V-type engine E having the cylinder 11 is mounted, a rear swing arm 26 with a rear wheel 27 is mounted on the rear end of the main frame 10, and the intake chamber 13 and the fuel tank 1 are mounted on the upper part of the main frame 10. is there. Further, the conventional technology is a V-type engine E
The intake chamber 13 is disposed above the fuel tank 1, the first half of the fuel tank 1 is disposed above the intake chamber 13, and the seat 29 is disposed behind the fuel tank 1.

The fuel tank 1 includes front and rear cylinders 11,
11 is an inverted L-shaped tank when viewed from the side, comprising a horizontal tank portion that covers the top of the cylinder 11 and a hanging tank portion that extends down from the rear end of the horizontal tank portion and covers the rear upper portion of the cylinder 11. The fuel tank 1 extends to the rear end along the main frame 10. The fuel pump 4 can be built in the fuel tank 1 by inserting the fuel pump 4 from the lowermost end of the hanging tank portion. The height of the bottom of the horizontal tank portion in the fuel tank 1 is substantially the same as the height of the seat 29.

[0004]

In the above prior art, the fuel tank 1 is arranged so as to cover the front and rear cylinders 11 and 11, so that the fuel tank 1 with the built-in fuel pump 4 and filled with fuel is provided. Has a high center of gravity. As a result, the center of gravity of the entire motorcycle is raised. In order to further improve the maneuverability of the motorcycle, it is preferable to lower the center of gravity of the entire motorcycle. In addition, even if the center of gravity of the motorcycle is lowered, the fuel tank needs to have a sufficient capacity.

It is an object of the present invention to provide a technique capable of lowering the center of gravity of a motorcycle equipped with a V-type engine having a front cylinder and a rear cylinder while securing the capacity of a fuel tank. is there.

[0006]

In order to achieve the above object, a first aspect of the present invention is to mount a V-type engine having a front cylinder and a rear cylinder substantially at the center of the body frame in a longitudinal direction, and to provide a swing with a rear wheel at a rear portion of the body frame. In a motorcycle in which an arm is mounted and a fuel tank is mounted on an upper part of a body frame, the fuel tank is disposed between a rear cylinder and a rear wheel, and a vertically long fuel supply pump is built in the fuel tank. , A seat is arranged above.

[0007] A fuel tank is disposed in an empty space between the rear cylinder and the rear wheel of the V-type engine. The portion of the fuel tank that incorporates the vertically long fuel supply pump is naturally deep, and therefore has a large capacity. Furthermore, out of the fuel tank,
The seat was arranged above the part where the fuel supply pump was built. The seat is determined based on the footing performance, and is arranged at a relatively low position. The deep part of the fuel tank containing the fuel supply pump must necessarily be lower than the seat. By utilizing the empty space, a deep part of the fuel tank can be extended downward. By lowering the height of the fuel tank in this way,
The center of gravity of the fuel tank filled with fuel can be lowered by incorporating a fuel supply pump. Moreover, the capacity of the fuel tank can be secured. By lowering the center of gravity of the fuel tank, the center of gravity of the motorcycle can be lowered.

[0008] A second aspect of the present invention is characterized in that an insertion port for inserting and attaching a fuel supply pump is provided on an upper surface of the fuel tank so that the fuel supply pump can be taken in and out from above the fuel tank. . Even if there is some fuel remaining in the fuel tank, maintenance and inspection work on the fuel supply pump can be easily performed by removing the seat and inserting and removing the fuel supply pump from the insertion port above the fuel tank. . Further, the fuel supply pump attached to the fuel tank is covered with a sheet. Therefore, the seat can also serve as a protector for protecting the upper part of the fuel supply pump.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow directions seen from the driver. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a left side view of a motorcycle according to the present invention, and shows a main part of a motorcycle 10. Motorcycle 10
A front fork 13 attached to a head pipe 12 of the body frame 11, a front wheel 14 attached to a lower portion of the front fork 13, a handle 15 connected to the front fork 13,
1 and an engine 16 mounted substantially at the center of the engine 1
6, a transmission 17 attached to the rear of the vehicle body 11, a swing arm suspension 18 attached to the rear of the body frame 11, a rear wheel 19 attached to the swing arm suspension 18, and a front attached to the upper part of the body frame 11. Part of intake box 21
A rear fuel tank 22, a fuel supply pump 23 built in the fuel tank 22, a rear cowl 24 covering the rear half of the fuel tank 22, a seat (seat cushion) 25 attached to the rear cowl 24, and a seat back 26.
And a main component.

The body frame 11 includes a head pipe 12
And a pair of left and right main frames 31, 31 extending rearward from the head pipe 12 (only one of the main frames 31, 31 is shown in this figure; the same applies hereinafter);
The left and right pivot mounting lower brackets 32, 32, lowered from the rear end, are the main components, and are substantially inverted L in side view.
It is a character-shaped frame.

The engine 16 is a V-type five-cylinder engine having a front cylinder 41 and a rear cylinder 42. The front cylinder 41 and the rear cylinder 42 are portions where a piston connected to a crankshaft (not shown) reciprocates, and has a cylinder head at an upper end. Engine 16 and transmission 17
Constitutes a power unit 43.

The swing arm type suspension device 18 is mounted on the lower bracket 32 (the rear part of the vehicle body frame 11) so that the base end of a swing arm 51 with a rear wheel can swing up and down.
Further, the swing arm 51 extends rearward, the rear wheel 19 is rotatably mounted on the rear end, the upper end of the cushion unit 52 is mounted near the base end of the swing arm 51, and the lower end of the cushion unit 52 is mounted on the lower bracket 32. Is attached via a link mechanism 53 to the lower end of the.
The link mechanism 53 includes a first link 54 having a triangular shape in a side view and a second link 55 which is elongated in the front and rear directions.

The fuel tank 22 mounted on the upper part of the main frame 31 has a long V-
It is a letter-shaped tank. More specifically, the fuel tank 22
Are the tank front half 22F ahead of the vertical line Ho passing through the V-shaped valley 22V and the tank rear half 22 behind the vertical line Ho.
And R are integrally formed. The inclination angle θ1 of the upper surface 61F of the tank front half 22F with respect to the vertical line Ho is approximately 20 °, and the upper surface 61F of the tank rear half 22R is substantially perpendicular to the vertical line Ho.
The inclination angle θ2 of R is approximately 80 °. Therefore, the V-shaped opening angle on the tank upper surfaces 61F and 61R, that is, θ1 +
θ2 is an obtuse angle of 100 °.

The tank front half 22F extends forward substantially along the main frame 31 while covering the rear cylinder 42, and partially overlaps the rear upper portion of the intake box 21. The tank rear half portion 22R extends rearward substantially along the rear wheel 19 and partially overlaps the front portion of the rear wheel 19. From the vertical line Ho to the tank first half 22F
Is L1 and the length from the vertical line Ho to the rear end of the tank rear half 22R is L2. Therefore, the total length of the fuel tank 22 is “L1 + L2”.

From the first perpendicular line Hf parallel to the vertical line Ho and in contact with the rear end of the rear cylinder 42, the rear wheel 1 parallel to the vertical line Ho and
The empty space Sp between the distance L3 and the second perpendicular line Hr that is in contact with the front end of No. 9 is relatively large. Since the intake box 21 is arranged above the engine 16, the rear wheels 1
This is because a relatively wide empty space Sp is formed between the rear cylinder 9 and the rear cylinder 42.

The present invention is characterized in that a V-shaped portion of the fuel tank 22 is arranged and a large-capacity portion is arranged by effectively utilizing the wide empty space Sp.
Specifically, the height (that is, the tank depth) that swells downward from the upper surfaces 61F and 61R is equal to the height of the fuel tank 22.
The portion arranged in the empty space Sp is larger than the other portions. Further, a vertically long fuel supply pump 23 is built in the rear half portion 22R of the tank. Naturally, the fuel tank 22
This is because the vertically long fuel supply pump 23 must be built deeper to accommodate the fuel supply pump 23. The capacity is large by the depth.

As described above, since the large capacity portion of the fuel tank 22 is disposed in the empty space Sp, the empty space S between the rear wheel 19 and the rear cylinder 42 is substantially provided.
Even if it is considered that the fuel tank 22 is arranged at p, there is not much difference. Therefore, in the present invention, it is assumed that the fuel tank 22 is disposed between the rear wheel 19 and the rear cylinder 42.

Further, a seat 25 is disposed above a portion of the fuel tank 22 in which the fuel supply pump 23 is built. That is, the seat 2 is located above the fuel supply pump 23.
5 was arranged. The seat 25 is determined based on the footing performance, and is disposed at a relatively low position. The deep portion of the fuel tank 22 in which the fuel supply pump 23 is built must necessarily be lower than the seat 25.
By using the empty space Sp, the deep part of the fuel tank 22 can be extended downward.

By lowering the height of the fuel tank 22 in this manner, the center of gravity of the fuel tank 22 having a built-in fuel supply pump 23 and filled with fuel can be lowered. Moreover, the capacity of the fuel tank 22 can be secured. By lowering the center of gravity of the fuel tank 22, the center of gravity of the motorcycle 10 can be lowered. Further, the fuel tank 22
You can lower the center of gravity of the
Inertia generated during rolling traveling can be reduced. As a result, the maneuverability of the motorcycle 10 can be improved. "Motorcycle maneuverability" refers to the property of the motorcycle moving as desired by the driver due to steering and posture changes applied to the steering system by the driver. In addition, 62 is a filler port.

The motorcycle 10 further includes a body frame 1
1 and the rear cowl 24 on the upper part of the main frame 31
The rear cowl 24 covers the upper portion and the left and right sides of the rear half portion 22R of the fuel tank 22. The rear cowl 24 includes a substantially horizontal flat cover 71 that covers the upper part of the tank rear half 22R, and a flat rear plate 72 that extends upward from the rear of the horizontal cover 71.
And a side plate 73 extending downward from the left and right ends of the horizontal cover 71 is a cover member integrally formed. The horizontal cover portion 71 has the seat 25 attached to the upper surface, the rear plate portion 72 has the seat back 26 attached to the front surface, and the side plate portion 73 extends forward and downward to be detachably attached to the main frame 31. It is a thing.

FIG. 2 is a sectional view of the fuel tank, the fuel supply pump and the rear cowl according to the present invention. The fuel tank 22 has an upper open cup (recess) 64 at the lowermost end surface, and an insertion opening 66 for inserting and attaching the fuel supply pump 23 on the upper surface. Specifically, the tank rear half portion 22R forms a cup 64 by bulging a predetermined depth downward from the bottom plate 63 at the lowermost end,
Further, a concave portion 65 having a horizontal bottom is formed at a position directly above the cup 64 in the upper surface 61R, and an insertion port 66 is provided at the bottom of the concave portion 65. 68 is a baffle plate.

The fuel supply pump 23 has a flat lid (head portion) 81 detachably attached to the flange 67 of the insertion port 66 and a stay 82 extending downward from the lid 81.
A pump body 83 attached to the stay 82, and a lowermost suction strainer 84 connected to a suction port of the pump body 83.
And a vertically long pump integrally assembled. Lid 8
1 has a fuel supply port 85 and a fuel return port 86.
The fuel supply pump 23 is, for example, an electric motor driven pump or an electromagnetic plunger pump. When such a fuel supply pump 23 is inserted from the insertion port 66 and attached, the suction strainer 84 can be arranged in the cup 64.

Furthermore, the seat surface for mounting the fuel supply pump 23, that is, the flange 67, needs to be a flat surface having a certain mounting area or more.
For this reason, a flat flange 67 is arranged under the flat sheet 25 in the fuel tank 22, and the fuel supply pump 23 is attached to the flange 67. Therefore, attachment of the fuel supply pump 23 is easy.

By driving the pump body 83, the fuel in the cup 64 is removed from the suction strainer 84 → the pump body 8.
The fuel can be supplied to the fuel injection system of the engine (not shown) by flowing through the route of 3 → first hose 91 → fuel supply port 85 → fuel supply pipe 92. Fuel can be rationally sucked from the lowermost part of the fuel tank 22 by the fuel supply pump 23. Excess fuel from the fuel injection system is returned to the return pipe 9
The fuel flows through the path of 3 → the fuel return port 86 → the second hose 94 and returns into the cup 64.

As described above, the seat 25 is
2 covers the fuel supply pump 23 attached to it. Therefore, the seat 25 can also serve as a protector for protecting the upper portion of the fuel supply pump 23.

FIG. 3 is an exploded view of the fuel tank, the fuel supply pump and the rear cowl according to the present invention. Since the insertion port 66 for inserting and attaching the fuel supply pump 23 is provided on the upper surface of the fuel tank 22, the fuel supply pump 23 can be taken in and out from above the fuel tank 22. Therefore, even if some fuel remains in the fuel tank, the seat 25 is removed together with the rear cowl 24, and the fuel supply pump 23 is taken in and out from the insertion port 66 above the fuel tank 22, so that the maintenance and maintenance of the fuel supply pump 23 can be performed. Inspection work can be performed easily.

[0028]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, since the fuel tank includes the vertically long fuel supply pump, the portion of the fuel tank in which the fuel supply pump is built becomes deeper, and the capacity of this portion also increases. Such a fuel tank is arranged in an empty space between a rear cylinder and a rear wheel in a V-type engine, and a seat is arranged above a portion of the fuel tank in which a fuel supply pump is built. The seat is determined by footing performance and is relatively low. The deep part of the fuel tank containing the fuel supply pump must necessarily be lower than the seat. By utilizing the empty space, a deep part of the fuel tank can be extended downward. By lowering the height of the fuel tank in this manner, the center of gravity of the fuel tank filled with fuel and having a built-in fuel supply pump can be lowered. Moreover, the capacity of the fuel tank can be secured. By lowering the center of gravity of the fuel tank, the center of gravity of the motorcycle can be lowered.
Furthermore, since the center of gravity of the fuel tank can be lowered to approach the center of weight of the vehicle, inertia generated during rolling traveling can be reduced. As a result, the maneuverability of the motorcycle can be improved.

According to a second aspect of the present invention, the fuel supply pump can be inserted and removed from above the fuel tank by providing an insertion port for inserting and attaching the fuel supply pump on the upper surface of the fuel tank. Even if some fuel remains, the seat can be removed and the fuel supply pump can be taken in and out from the insertion port above the fuel tank, so that maintenance and inspection of the fuel supply pump can be easily performed. Further, the fuel supply pump attached to the fuel tank is covered with a sheet. Therefore, the seat can also serve as a protector for protecting the upper part of the fuel supply pump.

[Brief description of the drawings]

FIG. 1 is a left side view of a motorcycle according to the present invention.

FIG. 2 is a cross-sectional view around a fuel tank, a fuel supply pump, and a rear cowl according to the present invention.

FIG. 3 is an exploded view of a fuel tank, a fuel supply pump, and a rear cowl according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 16 ... V engine, 19 ... Rear wheel, 22 ... Fuel tank, 23 ... Fuel supply pump, 25 ... Seat, 41 ... Front cylinder, 42 ... Rear cylinder, 51 ... Swing arm , 66 ... insertion port.

Claims (2)

[Claims] A motorcycle in which a V-type engine having a front cylinder and a rear cylinder is mounted substantially at the center of a body frame in a longitudinal direction, a swing arm with a rear wheel is mounted at a rear part of the body frame, and a fuel tank is mounted at an upper part of the body frame. , Wherein the fuel tank is disposed between the rear cylinder and the rear wheel, a vertically long fuel supply pump is built in the fuel tank, and a seat is disposed above the fuel supply pump. Motorcycle. 2. The fuel tank according to claim 1, wherein an insertion port for inserting and attaching the fuel supply pump is provided on an upper surface of the fuel tank so that the fuel supply pump can be taken in and out from above the fuel tank. Item 2. The motorcycle according to Item 1.