JP2003293887A - Fuel pump mounting structure in motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle wherein the contact of another member with a fuel pump is minimized even in toppling down, and cooling performance of the fuel pump is improved to reduce the generation of vapor lock. <P>SOLUTION: In this motorcycle loading a fuel injection-type engine E and a fuel tank 8 mounted on an upper part of the engine E, on a body frame 1, the fuel pump 25 receiving the fuel from the fuel tank 8, and pressure-feeding the fuel to injection valves 17f, 17r is mounted on a front face side of the engine E receiving the traveling wind. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a body frame,
An engine equipped with a fuel injection valve in the intake system and a fuel tank arranged above this engine are installed, and an exhaust pipe extending from an exhaust port opening at the front of this engine is installed to the left or right side of the engine. The present invention relates to a rational arrangement structure of a fuel pump that pressure-feeds fuel to the fuel injection valve in a motorcycle that is bent backward and arranged.

[0002]

2. Description of the Related Art Conventionally, in such motorcycles, it is already known to dispose a fuel pump for feeding fuel to a fuel injection valve below a fuel tank and behind a cylinder head of an engine (for example, Japanese Unexamined Patent Publication (Kokai) No. 2001-297711).

[0003]

In the conventional fuel pump arrangement structure as described above, the fuel pump is housed in the space surrounded by the engine and the fuel tank. Although it has the advantage of preventing the contact of objects, it has the drawback that the combustion pump tends to cause vapor lock inside due to the effect of heat emitted from the cylinder head of the engine. Further, in order to arrange the fuel pump at the rear of the cylinder head and directly below the fuel tank, at least the bottom wall of the existing fuel tank must be modified, that is, the fuel tank must be newly made, which results in an increase in cost.

The present invention has been made in view of the above circumstances, and prevents contact of other objects with the fuel pump as much as possible even when the motorcycle falls, and improves the cooling performance of the fuel pump to prevent vapor lock. An object of the present invention is to provide a fuel pump disposition structure for a motorcycle that can prevent the occurrence of the fuel and does not require modification of an existing fuel tank.

[0005]

In order to achieve the above object, the present invention mounts on a vehicle body frame an engine having a fuel injection valve in an intake system and a fuel tank arranged above the engine. However, in a motorcycle in which an exhaust pipe extending from an exhaust port that opens at the front of the engine is placed to the left or right of the engine and bent downward and rearward, the fuel in the fuel tank is received and the fuel The first feature is that a fuel pump for sending fuel under pressure to the injection valve is arranged on the front side of the engine that receives traveling wind.

According to the first feature, when the traveling wind generated by the traveling of the motorcycle hits the front surface of the engine, the fuel pump arranged on the front surface side is effectively cooled, so that the inside of the fuel pump is It is possible to prevent the occurrence of vapor lock. Moreover, since the fuel pump arranged on the front side of the engine does not project to the outside of the engine, it is possible to avoid contact with other objects even when the motorcycle falls.

By arranging the fuel pump on the front side of the engine, it is not necessary to modify the fuel tank above the engine, and the cost increase can be suppressed as much as possible.

In addition to the first feature of the present invention, a protective stay for covering the front surface of the engine is attached to the engine, and the fuel pump is housed in a pump case fixed to the protective stay in the protective region. Is the second feature.

According to the second feature, the protective stay and the pump case can strongly prevent the fuel pump from coming into contact with other objects and enhance its durability.

Further, in addition to the first or second feature, the present invention has a third feature in that an under cowl for covering the lower surface of the engine is attached to the protection stay.

According to the third feature, the protection stay for protecting the fuel pump also serves as the stay for mounting the under cowl, and the stator dedicated for mounting the under cowl is not required, which contributes to simplification of the mounting structure for the under cowl. You can

Further, in addition to any one of the first to third characteristics, the present invention brings the fuel pump to the lower side of the root of the exhaust pipe and to the left and right other sides opposite to the exhaust pipe. The fourth characteristic is that the above arrangement is made.

According to the fourth feature, heat damage from the exhaust pipe to the fuel pump can be avoided as much as possible, and vapor lock can be prevented from occurring in the fuel pump.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described based on the embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a side view of a motorcycle equipped with the fuel pump arrangement structure of the present invention, FIG. 2 is an enlarged vertical side view of a portion 2 of FIG. 1, and FIG. 3 is a view taken in the direction of arrow 3 of FIG. 2 is an enlarged view of a main part of FIG. 2 (shown in a state where the under cowl is removed), and FIG. 5 is a view taken along arrow 5 of FIG.

1 and 2, a vehicle body frame 1 of a motorcycle M has a head pipe 2 at a front end and an engine hanger 3 at an intermediate portion, and the head pipe 2 has a front wheel 4f. The supporting front fork 5 is operably connected, and the engine hanger 3 is provided with an engine E arranged immediately behind the front wheel 4f. The engine E is a V type having a pair of front and rear banks 7f and 7r. A fuel tank 8 arranged above the engine E and an occupant seat 9 connected to the rear end of the fuel tank 8 are mounted on the vehicle body frame 1.

At the rear of the engine E, the rear wheel 4r is provided at the rear end.
A rear fork 10 that supports the vehicle is pivotally supported so as to be vertically swingable, and a rear cushion 11 is interposed between the rear fork 10 and the vehicle body frame 1. The rear wheel 4r is driven by the power of the engine E transmitted via the chain transmission 12.

In the V-type engine E, the front bank 7f
Throttle bodies 16f and 16r are connected to intake pipes projecting from the rear surface of the vehicle and the front surface of the rear bank 7r,
Further, electromagnetic fuel injection valves 17f and 17r capable of injecting fuel are attached to the intake pipe.

A fuel pump 25 for pumping the fuel received from the fuel tank 8 to the fuel injection valves 17f and 17r is housed in a pump case 32 and arranged on the front side of the engine E. The fuel pump 25 is of an electric type having a driving motor built therein, and has a suction pipe 40 and a discharge pipe 41 projecting outside the pump case 32 at both upper and lower ends thereof. Fuel inside is fuel strainer 4
2. It is gravity fed through the fuel cock 43 and the fuel conduit 44. The high-pressure fuel discharged from the discharge pipe 41 is supplied to the fuel injection valves 17f and 17r of the front and rear banks 7f and 7r through the fuel supply pipe 45 and the distribution pipe 46.

Further, the fuel pump 25 has a built-in fuel pressure regulator 38 which releases the excess pressure when the discharge pressure becomes a predetermined value or more. The excess pressure fuel passes from a fuel outlet pipe 47 to a fuel return pipe 48. It is returned to the gas phase portion in the fuel tank 8.

Front bank 7f and front bank 7r
Exhaust pipe 18 connected to each exhaust port
f and 18r are respectively connected. At that time, the front exhaust pipe 18f is offset from the longitudinal center plane Y of the motorcycle M to one side, that is, to the right of the vehicle in the illustrated example, to the engine E.
It is connected to the front surface of the car, then extends forward, and then is bent toward the same side, downward, and rearward (see Fig. 3). The rear exhaust pipe 18r is arranged so as to extend rearward from the rear surface of the rear bank 7r to the left and right.

As shown in FIGS. 4 and 5, the starter motor 21 is provided on the front surface of the crankcase 20 of the engine E.
Is mounted sideways, and the oil filter 22 is mounted on the front surface of the oil pan 23.

2 and 3, the fuel pump 25 disposed on the front side of the engine E is offset from the longitudinal center plane Y of the motorcycle M on the opposite side of the front exhaust pipe 18f and at the front side. The exhaust pipe 18f is disposed at a position closer to the lower side than the root. The fuel pump 25 is housed and held in a pump case 32 elastically supported by a protection stay 26 fixed to the engine E.

As shown in FIGS. 3 to 5, the protective stay 26
Is a vertical aggregate 27 and a horizontal aggregate 28 which are made of steel pipes and are connected in a cross shape. The vertical aggregate 27 has a front bone 27a extending in the vertical direction and a rearward bend from the lower end of the front bone 27a. And a lower bone 27b extending in a lateral direction and having a substantially L-shape in a side view, and the horizontal aggregate 28 is a right bone 28a extending obliquely from the lower end of the vertical bone 27a to the right and rear of the vehicle.
And a right bone 28b that obliquely extends to the left and rear of the vehicle from the lower end of the vertical bone 27a, and the rear end of the left bone 28b is joined to the rear end of the lower bone 27b by welding. A first support bracket 30a is formed on the front bone 27a, and a second support bracket 30b is formed on the lower bone 27b. The pump case 32 is supported by these support brackets 30a and 30b via elastic members 31. And is surrounded by the protective stay 26. That is, the protection stay 2
It is housed in 6 protected areas. The pump case 32 is composed of a pair of upper and lower case halves 32a and 32b that are separably bolted together. By separating both case halves 32a and 32b, the fuel pump 25 to the pump case 32 is separated.
Can be attached and removed. A protective cover 33 covering the front surface of the upper half of the pump case 32 is welded to the front bone 27a, and a plurality of ventilation holes 34, 34 ... Are formed in the protective cover 33.

Mounting brackets 35a, 35b, 35c are provided at the respective ends of the front bone 27a, the lower bone 27b and the right bone 28a.
And the mounting bracket 3 for the front bone 27a is formed.
5a is bolted to the front of the front bank 7f, the mounting bracket 35b of the lower bone 27b is bolted to the side of the crankcase 20, and the mounting bracket 35c of the right bone 38a is to the front of the crankcase 20 together with the starter motor 21. Bolted together. Thus, the fuel pump 25 housed in the pump case 32 is arranged on the front side of the engine E as described above.

The protective stay 26 is formed with a plurality of (a pair of left and right in the illustrated example) cowl support brackets 36a and 36b. These are attached to the lower portion of the pump case 32, from the lower surface of the engine E to one of its side surfaces. An under cowl 37 covering the portion is bolted.

Next, the operation of this embodiment will be described.

While the motorcycle is traveling, the driving wind is generated by the engine E.
When it hits the front surface of the vehicle and cools it, a part of the running wind passes through the ventilation holes 34, 34, ... Of the protective cover 33 and hits the pump cover 33, and the internal fuel pump 25 is effectively passed through this pump cover 33. It can be cooled, and as a result, vapor lock can be prevented from occurring in the fuel pump. Moreover, since the fuel pump 25 arranged on the front side of the engine E does not project to the outside of the engine E, even when the motorcycle M falls, it is possible to avoid contact with other objects. Further, by disposing the fuel pump 25 on the front side of the engine E, it is not necessary to modify the fuel tank 8 above the engine E.

In particular, since the fuel pump 25 is covered by the protective stay 26 and the protective cover 33 attached to the engine E, the protective stay 26 and the protective cover 33 reliably prevent contact with other objects and ensure durability. It is possible to secure the sex.

Further, the pump case 32 for accommodating the fuel pump 25 is located below the root of the front exhaust pipe 18f on the front side of the engine E and on the vertical center plane Y of the motorcycle M.
Since it is disposed on the opposite side of the exhaust pipe 18f with the fuel cell interposed therebetween, heat damage from the front exhaust pipe 18f to the fuel pump 25 can be prevented as much as possible and its durability can be secured. Further, the pump case 32 is a vertical center plane Y of the motorcycle M.
Since the front wheel 4f is displaced to the engine E side due to a frontal collision of the motorcycle M, the front wheel 4f is prevented from coming into contact with the fuel pump 25 and the fuel pump 25 It can prevent damage.

On the other hand, the under cowl 37 has a protective stay 2
Since it is attached by using 6, it is not necessary to provide a stay for attaching the under cowl, which can contribute to simplification of the attachment structure.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the present invention can be applied to a single-cylinder or multi-cylinder engine having only a single upright bank.

[0033]

As described above, according to the first feature of the present invention, an engine having a fuel injection valve in an intake system and a fuel tank arranged above the engine are mounted on a vehicle body frame. In a motorcycle in which an exhaust pipe extending from an exhaust port opening at the front of the engine is placed to the left or right of the engine and bent downward and rearward, the fuel in the fuel tank is received and the fuel injection is performed. Since the fuel pump that pumps fuel to the valve is installed on the front side of the engine that receives the running wind, the fuel pump can be effectively cooled by the running wind and vapor lock in the fuel pump can be prevented. . Moreover, since the fuel pump arranged on the front side of the engine does not project outside the engine,
Even when the motorcycle falls, it is possible to avoid contact with other objects. Also, by arranging the fuel pump on the front side of the engine, it is not necessary to modify the fuel tank above the engine, and the cost increase can be suppressed as much as possible.

According to the second aspect of the present invention, the engine is provided with the protective stay covering the front surface thereof, and the fuel pump is housed in the pump case fixed to the protective stay in the protective region. The protective stay and the pump case can strongly prevent the fuel pump from coming into contact with other objects and enhance its durability.

Further, according to the third feature of the present invention, the first
In addition to the second feature, since the under cowl that covers the lower surface of the engine is attached to the protection stay, the protection stay that protects the fuel pump also serves as the under cowl mounting stay, and the stator dedicated for mounting the under cowl is used. Is unnecessary and can contribute to simplification of the mounting structure of the under cowl.

Still further according to the fourth aspect of the present invention,
In addition to any one of the first to third characteristics, the fuel pump is arranged below the root of the exhaust pipe and to the left and right other sides opposite to the exhaust pipe. It is possible to avoid heat damage to the fuel pump as much as possible and prevent vapor lock from occurring in the fuel pump.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle including a fuel pump arrangement structure of the present invention.

FIG. 2 is an enlarged vertical side view of part 2 in FIG.

FIG. 3 is a view on arrow 3 of FIG.

FIG. 4 is an enlarged view of the main part of FIG. 2 (shown with the under cowl removed).

5 is a view taken in the direction of arrow 5 in FIG.

[Explanation of symbols]

E ... Engine M: Vehicle (motorcycle) 1 ... Vehicle frame 8: Fuel tank 17f, 17r ... Fuel injection valve 18f ... Exhaust pipe 25 ... Fuel pump 26 ... Protective stay 32 ... Pump case 37 ... Anda cowl

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 37/20 F02M 37/20 K 53/00 53/00 D

Claims (4)

[Claims] 1. A vehicle body frame (1), an engine (E) having a fuel injection valve (17f, 17r) in an intake system, and a fuel tank (8) arranged above this engine (E).
A motorcycle in which an exhaust pipe (18f) extending from the front surface of the engine (E) is brought to one side of the engine (E) and is bent downward and rearward. A fuel pump (2) which receives the fuel of (8) and pressure-feeds the fuel to the fuel injection valves (17f, 17r).
A fuel pump arrangement structure for a motorcycle, characterized in that 5) is arranged on the front side of an engine (E) that receives traveling wind. 2. A fuel pump arrangement structure for a motorcycle according to claim 1, wherein the engine (E) has a protective stay (26) covering the front surface thereof.
A fuel pump arrangement structure for a motorcycle, characterized in that the fuel pump (25) is housed in a pump case (32) fixed to the protection stay (26) in the protection area. 3. The fuel pump arrangement structure for a motorcycle according to claim 1, wherein an under cowl (37) for covering a lower surface of the engine (E) is attached to the protection stay (26). , Fuel pump arrangement for motorcycles. 4. The fuel pump module for a vehicle according to claim 1, wherein the fuel pump (25) is provided below the root of the exhaust pipe (18f) and with the exhaust pipe (18f). Is a fuel pump arrangement structure for a motorcycle, characterized in that the fuel pumps are arranged close to each other on the left and right sides.