JP2936014B2 - Fuel injection device for motorcycle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for a motorcycle engine.

[0002]

2. Description of the Related Art Conventionally, motorcycles are configured as follows.
Something was done.

That is, a front which is vertically elongated and whose axis is inclined backward.
A fork is steerably supported on the front end of the body frame
The front wheel is supported on the lower end of the front fork.
I have. A fuel injection valve for injecting pressurized fuel and pressurized air toward the inside of the engine cylinder supported by the body frame is provided, and the pressure of the pressurized fuel and pressurized air are respectively controlled by these pressures. A differential pressure regulator that regulates pressure is provided , and a cover body that covers the engine and the differential pressure regulator from outside the vehicle body is provided.

[0004] The above-mentioned differential pressure regulator has been conventionally used.
Shaft having a longitudinally elongated outer shape and extending in the longitudinal direction thereof.
With a diaphragm that extends in a direction substantially perpendicular to the heart
According to this differential pressure regulator,
The central part of the diaphragm is the pressurized fuel supplied to it.
The above differential pressure regulation according to the differential pressure between
And the above pressures are regulated.
(For example, Japanese Utility Model No. 1-166268)
Gazette).

[0005]

[SUMMARY OF THE INVENTION Incidentally, in order to compact particular vehicle is a motorcycle, various vehicle body components are provided in a compact, for this, the motorcycle
When the vehicle is traveling, the traveling wind heading for the differential pressure regulator may be blocked by other components, resulting in insufficient cooling of the differential pressure regulator. And like this
If the cooling air becomes insufficient and the pressure of the pressurized air in the differential pressure regulator becomes high, the characteristics of the differential pressure regulator change and the desired pressure can not be adjusted, and the desired injection operation by the fuel injection valve cannot be obtained. This causes the inconvenience.

Therefore, the traveling wind is, for example, the engine
The differential pressure above the cylinder so that it is not blocked by
Position the regulator and move it up faster than the above cylinder.
The differential pressure regulator is cooled by running wind.
Can be considered.

[0007] However, as described above,
Pressure differential from a fuel injector that injects pressurized fuel, etc.
This can cause the regulator to move farther forward,
Communicates these fuel injectors with the differential pressure regulator.
This is not preferable because the length of the piping becomes longer.

Also, when the motorcycle is running,
The above differential pressure regulator vibrates.
If the diaphragm flexes greatly due to the above vibration, this differential pressure
The regulator characteristics change and the desired pressure cannot be adjusted.
Also in this case, the desired injection operation by the fuel injection valve is performed.
There is a disadvantage that it cannot be obtained.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in focusing on the circumstances as described above, during running of the motorcycle, the differential pressure regulator
The desired pressure adjustment by the
To obtain the desired injection operation according to
Even if you do so, pressurized fuel etc. into the cylinder
The fuel injection valve that injects and the differential pressure regulator communicate with each other
The purpose is to prevent the piping to be made from becoming long .

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is characterized in that it is vertically elongated and its axial center is rearward.
Attach the front fork 8 to the front end of the body frame 2
The lower end of the front fork 8
A high-pressure fuel injection valve ( fuel injection valve) that mixes and injects pressurized fuel and pressurized air into the cylinder 25 of the engine 16 supported by the body frame 2. ) 48 to provide a vertically long outer shape and
Diaphragm extending in a direction substantially perpendicular to the axial center
And a differential pressure regulator 62 for regulating each pressure of the pressurized fuel and the pressurized air by these pressures.
Is disposed on the front side of the vehicle body frame 2 in a side view of the vehicle body.
Mounted on the body frame 2 side, provided with a cover member 85 covering the said engine 16 and the differential pressure regulator 62 from the vehicle body outer side, running wind to the cover body 85 8
In a motorcycle in which an opening 88 for introducing the 7 is formed at the front of the cover body 85 ,

The differential pressure regulator 62 is mounted on the vehicle body side view.
Above and directly above the cylinder 25 of the engine 16
It is disposed in the opening 88 at a position away from the cylinder 25 upward ,

When the differential pressure regulator 62 is
So that the axis intersects the axis of the front fork 8
The point is that the differential pressure regulator 62 is inclined forward .

[0013]

[Operation] The operation of the above configuration is as follows.

When the differential pressure regulator 62 is
Right above the cylinder 25 of the engine 16 and this cylinder
It is arranged in the opening 88 at a position away from
You.

For this reason, when the motorcycle 1 is traveling,
Any one of the cylinder 25 and the differential pressure regulator 62
When the traveling wind 87 going to the direction is blocked by the other
That is avoided. Also collided with one of them
When a part of the traveling wind 87 is going to the other side, this traveling
Part of the wind 87 is supplied to the cylinder 25 and the differential pressure regulator 6.
2 to smoothly flow backward.

Therefore, the cylinder 25 and the differential pressure regulation
The motor 62 is effectively cooled by the traveling wind 87, respectively.
Moreover, the differential pressure regulator 62 passes through the opening 88.
The cooling air 87 is further effectively cooled.

Further , as described above, the true
Since the differential pressure regulator 62 is provided above,
Injects pressurized fuel and pressurized air into the cylinder 25
The differential pressure regulation from the high pressure fuel injection valve (fuel injection valve) 48
It is suppressed that the radiator 62 moves far away.

Therefore, pressurized fuel or the like is stored in the cylinder 25.
High-pressure fuel injection valve (fuel injection valve) 48 for injecting
The differential pressure regulator 62 for regulating the pressure of the fuel
The length of the piping for communication is prevented from becoming longer.
You.

Here, it is arranged on the front side of the body frame 2.
Differential pressure regulation attached to this body frame 2 side
When the motorcycle 1 is traveling, the
Let's vibrate more in the longitudinal direction of the tok 8
And the differential pressure regulator 62
Earhram also tries to bend.

Therefore, according to the present invention, a vertically elongated rearwardly inclined flow
The vehicle fork 8 to the front end of the body frame 2,
And a vertically elongated die extending in a direction substantially perpendicular to its longitudinal direction.
A differential pressure regulator 62 having an inner
It is arranged on the front side of the frame 2 and
When installed, the differential pressure regulation
The axis of the radiator 62 crosses the axis of the front fork 8.
Tilt the differential pressure regulator 62 forward.
You.

For this reason, the longitudinal length of the front fork 8
The diaphragm of the differential pressure regulator 62
Will be closer to the parallel direction,
As described above, the differential pressure regulator 62
When trying to vibrate more longitudinally,
The diaphragm of the differential pressure regulator 62 extends
Direction, that is, in the direction with a relatively large elastic modulus.
Tend to be vibrated.

Therefore, the diaphragm is caused by the vibration.
Large bending is prevented.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a motorcycle,
2 is a body frame, the body frame 2 has a head pipe 3 at its front end <br/>, single tank rail 4 extends toward the rearward and downward from the head pipe 3, of the tank rails 4 A pair of left and right seat pillar tubes 5 extend rearward and downward from the rear end.

A down tube 6 connecting the head pipe 3 and each lower end of the seat pillar tube 5 is provided. The down tube 6 has one front tube 6a extending downward from the head pipe 3, It comprises a pair of left and right rear tubes 6b, 6b connecting the lower end of the front tube 6a and the lower end of the seat pillar tube 5. Further, a stay 7 is provided between the front and rear portions of the tank rail 4 and the front tube 6a.

The head pipe 3 is vertically elongated and has an axial center.
A front fork 8 that tilts rearward is steerably supported, and a front wheel 9 is supported at the lower end of the front fork 8 .
A handle 10 is attached to the upper end of the front fork 8 . On the other hand, the seat pillar tube 5
A rear arm 12 is pivotally supported by a pivot shaft 11 on a rear arm bracket 5a attached to the lower end of the tank arm 4 so that the rear arm 12 can swing up and down. . A rear wheel 14 is supported on the swinging end of the rear arm 12.

Reference numeral 16 denotes a two-cycle engine. A power transmission device 17 is connected to the engine 16, and the engine 16 and the power transmission device 17 are supported on the vehicle body frame 2 by the pivot shaft 11 and bolts 18. ing. The output of the power transmission device 17 is connected to the chain transmission means 1.
9 to the rear wheels 14 so that the motorcycle 1 can run. A fuel tank 21 is supported by the tank rail 4 so as to straddle the tank rail 4. 22 is a sheet.

Referring mainly to FIGS. 4 and 5, the engine 1
6, a crankshaft 24 is supported in the crankcase 23. A cylinder 25 projects forward and upward from the crankcase 23, and a piston 26 is slidably fitted in the cylinder 25 along the axis of the cylinder 25. The piston 26 is linked to the crankshaft 24 by a connecting rod 28. A cylinder head 30 is provided at the protruding end of the cylinder 25.
Is screwed.

The crankcase 23 has an intake port 3
3 are formed. A reed valve 34, an intake pipe 35, and an air cleaner 36 are connected to the intake port 33, and the intake pipe 35 is provided with a throttle valve 35a. Further, a space surrounded by the cylinder 25, the piston 26, and the cylinder head 30 is a combustion chamber 37, and a scavenging port 38 that communicates with the combustion chamber 37 from inside the crankcase 23 is formed in the cylinder 25. A pair of left and right spark plugs 39 facing the combustion chamber 37 is provided. Further, an exhaust port 40 is formed in the cylinder 25. An exhaust pipe 41 and a silencer 43 are connected to the exhaust port 40.

In the above case, a high tension cord from the ignition plug 39 to the power supply side may be disposed inside a copper pipe or rubber pipe to protect it.

3 to 6, a fuel injection device 46 for injecting and supplying fuel to the combustion chamber 37 is provided. The fuel injection device 46 has a high-pressure fuel injection valve 48 of an electromagnetic opening and closing type, and a fuel injection port of the high-pressure fuel injection valve 48 opens toward the combustion chamber 37. The intake pipe 3
5 is provided with a low-pressure fuel injection valve 50 of an electromagnetic opening and closing type, and the fuel injection port of this low-pressure fuel injection valve 50 is a reed valve 3.
4 is open toward the inside.

The fuel tank 21 has an inverted U-shape in a front view and has a tank body 51 straddling the tank rail 4. An injection pipe 52 is attached to the front upper portion of the tank body 51. A cap 53 for opening and closing the pipe 52 is provided.

A fuel pump 56 pressurizes and feeds the fuel from the fuel tank 21 to each of the injection valves 48 and 50.
Is provided. The fuel pump 56 is connected to the engine 16.
Thus, the fuel in the fuel tank 21 is sucked into the fuel pump 56 through the first fuel filter 58 and the supply pipe 57. On the other hand, the fuel pump 56
Is supplied to the high-pressure fuel injection valve 48 through the second fuel filter 59 and the high-pressure pipe 60.

A branch pipe 61 branching from the high-pressure pipe 60 is provided. The branch pipe 61 is connected to a differential pressure regulator 62. The differential pressure regulator 62 is connected to the low-pressure fuel injection valve 50 by a low-pressure pipe 63. I have. The low-pressure pipe 63 is connected to the injection pipe 52 of the fuel tank 21 via a regulator 64 and a return pipe 65. In this case, the return pipe 65 uses the gap between the tank rail 4 and the tank body 51 and is piped along the lower surface of the tank body 51.

An air pump 67 for supplying pressurized air to the high-pressure fuel injection valve 48 and the differential pressure regulator 62 is provided. The air pump 67 is mechanically driven by the engine 16 via a power transmission device 17.
The outside air is sucked in through the air pipe 68 and the air. The discharge port of the air pump 67 is connected to the high-pressure fuel injection valve 48 by a first pressure pipe 69, and the first pressure pipe 69 is connected to the differential pressure regulator 62 by a second pressure pipe 70. Have been.

The differential pressure regulator 62 controls the high-pressure fuel injection valve 48 by the pressure of the pressurized fuel or pressurized air sent from the fuel pump 56 or the air pump 67.
The pressure of the pressurized fuel or pressurized air to be fed into the air is adjusted. During the pressure adjustment, excess air is generated in the differential pressure regulator 62, and a discharge pipe 71 for guiding the excess air into the exhaust pipe 41 is provided.

Referring to FIGS. 3 to 6, the engine 16
Operates, the fuel pump 56 operates accordingly, and the fuel in the fuel tank 21 passes through the supply pipe 57,
The fuel is sucked into the fuel pump 56 (arrow A in FIGS. 4 and 6). The fuel discharged from the fuel pump 56 passes through the second fuel filter 59 and the high-pressure pipe 60 and is sent to the high-pressure fuel injection valve 48 (arrow B in FIGS. 4 and 6). Pressure regulator 6
2 (arrow C in FIGS. 4 and 6). In this case, the pressure of the fuel sent to the high-pressure fuel injection valve 48 is set to a high pressure by the differential pressure regulator 62.

The fuel discharged from the differential pressure regulator 62 passes through the low-pressure pipe 63 and the low-pressure fuel injection valve 5.
0 (arrow D in FIGS. 4 and 6), and is also sent to the regulator 64 at the same time. In this case, the pressure of the fuel sent to the low-pressure fuel injection valve 50 is set to a low pressure by the regulator 64. Further, the fuel discharged from the regulator 64 is returned to the fuel tank 21 through the return pipe 65 (arrow E in FIGS. 3, 4, and 6).

On the other hand, as the engine 16 operates,
The air pump 67 also operates, and outside air is sucked into the air pump 67 through the air cleaner 36 and the air pipe 68 (arrows F in FIGS. 4 and 6). Then, the air discharged from the air pump 67 is sent to the high-pressure fuel injection valve 48 through the first pressure pipe 69 (arrow G in FIGS. 4 and 6), and at the same time, the differential pressure is passed through the second pressure pipe 70. It is sent to the regulator 62 (arrow H in FIGS. 4 and 6).
In this case, the pressure of the air sent to the high-pressure fuel injection valve 48 is set to a high pressure by the differential pressure regulator 62. Excess air generated from the differential pressure regulator 62 at the time of this pressure adjustment passes through the exhaust pipe 71 through the exhaust pipe 71.
1 (arrow I in FIGS. 4 and 6).

The low-pressure fuel injection valve 50 is operated at the time of starting the engine 16, at the time of medium speed and high load, and at the time of high speed, and the fuel fed to the low pressure fuel injection valve 50 is used as described above. Injection is performed as appropriate. Meanwhile, engine 1
At 6 medium-speed normal load, the high-pressure fuel injection valve 48 is operated, and the mixed injection is performed by the fuel and air sent to the high-pressure fuel injection valve 48 as described above.

In FIG. 4, an arm 72 protrudes from the middle of the tank rail 4 toward the lower front. The cylinder head 30 is screwed to the protruding end of the arm 72 by the bolt 18. And this gives
The cylinder head 30 is prevented from vibrating, that is, the high-pressure fuel injection valve 48 attached to the cylinder head 30 is not vibrated.

As shown in FIG. 4, the differential pressure regulator 62 has a vertically long outer shape and
It is disposed on the front side and attached to the body frame 2 side. In this case, the axis of the differential pressure regulator 62 extend in the longitudinal direction of the longitudinal described above, the differential pressure regulator 62 has an inner diaphragm extending substantially perpendicular to the axis. The differential pressure regulator 62 has such a property that when vibrated in the longitudinal direction along the axis, the diaphragm bends most, and desired characteristics cannot be secured.

Therefore, as described above, the front fork
8 is tilted backward, while the difference is
The axis of the pressure regulator 62 is
The differential pressure regulator 62 is tilted forward so as to cross the axis.
That is, the axis of the differential pressure regulator 62 is inclined with respect to the longitudinal direction of the front fork 8, which is considered to increase in vibration when the motorcycle 1 travels.
Then, with respect to the longitudinal direction of the front fork 8,
The direction in which the diaphragm of the differential pressure regulator 62 extends
The attitude of the differential pressure regulator 62 is determined so as to approach parallel .

Referring to FIGS. 1 to 5, the engine 16
Cooling device is provided. This cooling device has a radiator 79 deviated to the left side of the vehicle body, and this radiator 79 is connected to a water pump 81 by a first pipe 80. The water pump 81 is driven by the engine 16, and the cooling water discharged from the water pump 81 is sent to the cylinder 25 and the jacket in the cylinder head 30, and then sent to the radiator 79 by the second pipe 82. The water pump 81
Is to be returned to.

1 to 5, a resin front cowl 84 is provided in front of the head pipe 3.
The front cowl 84 covers the front part of the vehicle body from the front. A resin cover 85 is provided to cover the lower portion of the tank body 51, the upper portion of the cylinder 25, the fuel injection device 46, and the radiator 79 from outside. The cover 85 is formed by a pair of left and right side cowls 86, 86. It is configured.

In particular, as shown in FIG. 1, each of the side cowls 86 is inclined outward toward the front. A running wind 87 is formed between the front ends of the left and right side cowls 86, 86.
Is formed in the cover body 85 to form an opening 88.
In the vicinity of each side cowl 86 in the opening 88, a louver 8 for guiding the traveling wind 87 toward the center of the vehicle body is provided.
9 and 89 are provided, and each louver 89 is integrally formed with the corresponding side cowl 86.

In FIGS. 1, 3 and 4, each side cowl 86 has an upper air outlet 9 serving as an air passage.
1 and a lower air outlet 92 are formed. The traveling wind 87 introduced into the cover body 85 from the opening 88
A portion 87a is discharged rearward and outward from the upper air discharge port 91 and the lower air discharge port 92, and the other portion passes through the rear ends of the left and right side cowls 86 and 86 to the rear of the vehicle body, and the traveling wind 87 air-cools the cylinder 25 and the fuel injection device 46 covered by the cover body 85.

In FIG. 1, the left and right louvers 89, 8
The radiator 79 is disposed in the vicinity of the rear of the left louver 89 among the louvers 89, and is sufficiently cooled by the traveling wind 87 passing through the louver 89. On the other hand, when the differential pressure regulator 62 is viewed from the side of the vehicle body (FIG. 3), the engine
Directly above the 16 cylinders 25 and this cylinder 25
And a little above the pressure difference.
The regulator 62 is disposed in the opening 88 and near the rear of the right louver 89, and is sufficiently air-cooled by the traveling wind 87 passing through the louver 89. Further, an oil tank 93 is provided near the differential pressure regulator 62. The oil tank 93 stores lubricating oil for lubricating the internal mechanism of the engine 16.
Air-cooled with 2.

4, 7 and 8, the high-pressure fuel injection valve 48 will be described in more detail. The high-pressure fuel injection valve 48 has a casing 95 attached to the cylinder head 30 and a bracket 96 located slightly away from the casing 95.
A pair of collars 97, 97 are interposed between the casing 95 and the bracket 96, and the bracket 96 is attached to the casing 9 by bolts 98 penetrating the collars 97.
5 is detachably fixed.

A first hole 100 is formed in the casing 95 between the bolts 98 and 98 on an axis 99 parallel to the bolts 98, and the first hole 100 is formed in an injection hole of the high-pressure fuel injection valve 48. Communicating. The same axis 9
9, a second hole 101 is formed in the bracket 96, and the second hole 101 communicates with the high-pressure pipe 60.

Reference numeral 103 denotes an injection valve main body, and a fuel injection side end 104 of the injection valve main body 103 is fitted into the first hole 100 so as to be movable in the axial center 99 direction. Further, the fuel receiving side end 105 of the injection valve main body 103 is the second hole 1.
01 is movably fitted in the axial center 99 direction.

A first seal ring 106 and a second seal ring 10 are provided between the inner peripheral surfaces of the first hole 100 and the second hole 101 and the outer peripheral surfaces of the injection end 104 and the reception end 105.
7 are interposed. In addition, a third seal ring 108 is interposed between the bottom surface of the first hole 100 and the end surface of the ejection side end 104, and the lower surface of the bracket 96 and the receiving side end 10.
A fourth seal ring 109 is also interposed between the fifth seal surface and the fifth step surface.

The injection valve main body 103 is elastically supported by the casing 95 and the bracket 96 via the seal rings 106 to 109, and the fuel is supplied to the high pressure fuel injection valve by the seal rings 106 to 109. 48 is prevented from leaking.

In the above case, each of the seal rings 106 to 10
Since 9 has elasticity, vibration is prevented from being transmitted to the injection valve main body 103 from the casing 95 or the bracket 96 side, and the mounting error of the injection valve main body 103 is absorbed.

[0055]

According to the present invention , the shaft is vertically elongated and its axial center is
Steering front fork tilts to front end of body frame
Freely support the front fork at the lower end of the front wheel
Of the engine supported by the body frame
Pressurized fuel and pressurized air are mixed and injected into the cylinder.
A fuel injection valve to shoot
A duct extending in a direction substantially perpendicular to its longitudinal axis.
Each pressure of the above-mentioned pressurized fuel and pressurized air having an ear flam inside
Pressure regulation by each of these pressures.
Locator is located on the front side of the body frame when viewed from the side of the body
And attached to the body frame side,
Install a cover that covers the pressure regulator from the outside of the body.
And an opening for introducing the traveling wind into the cover
In the motorcycle formed at the front of the cover body,

When the above differential pressure regulator is
Right above the engine cylinder and from this cylinder
Arranged in the opening at a distance upward,

The axis of the differential pressure regulator when viewed from the side of the vehicle body
So that it intersects the axis of the front fork,
The pressure regulator is tilted forward, and the following effects occur.

That is, as described above, the differential pressure regulator
Right above the engine cylinder and
At the opening away from the cylinder above.
You.

Therefore, when the motorcycle is running, the above serial
Head and one of the differential pressure regulator
Avoid that the running wind is blocked by the other
Is done. In addition, part of the traveling wind that collided with either one
When going to the other side, part of this traveling wind
Flow smoothly through the gap between the
Will be done.

Therefore, the cylinder and the differential pressure regulator
Is effectively cooled by the traveling wind, and
The above differential pressure regulator is more effective by the running wind passing through the opening.
Cooled effectively. For this reason, the above differential pressure regulator
This prevents the pressurized air from becoming hot,
The pressure regulator maintains the specified characteristics, and
A desired injection operation by the firing valve is obtained.

Also, as described above, right above the cylinder
Because a differential pressure regulator is installed,
Fuel injection valve that injects pressurized fuel and pressurized air toward
The differential pressure regulator is far away
Is done.

Therefore, pressurized fuel or the like is injected into the cylinder.
A fuel injection valve to be injected and a differential pressure regulator for regulating the above-mentioned pressurized fuel and the like.
The piping for communicating the regulator with each other becomes longer
That is prevented.

[0063] Here, it is arranged on the front side of the body frame.
Differential pressure regulation attached to lever body frame side
When the motorcycle is running, the front fork
Try to vibrate more in the longitudinal direction of the and
As a result, the diaphragm and flexure of the differential pressure regulator
Try to.

Therefore, as described above, the rearward tilt is vertically long.
Let the front fork be supported on the front end of the body frame,
And a vertically elongated die extending in a direction substantially perpendicular to its longitudinal direction.
The differential pressure regulator with the inner
On the front side of the vehicle
When the differential pressure regulator is
Make sure that the axis crosses the axis of the front fork
The differential pressure regulator is tilted forward.

For this reason, the longitudinal direction of the front fork
The differential pressure regulator diaphragm extends
Direction becomes closer to parallel, as described above.
The differential pressure regulator in the longitudinal direction of the front fork.
When trying to vibrate more toward
The diaphragm of the
Vibrating in the direction of relatively large elastic modulus.
It tends to be.

Therefore, the diaphragm is moved by the vibration.
Large deflection is prevented and the differential pressure regulation
The predetermined characteristics are maintained in the
Thus, a desired injection operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial plan view of what is shown in FIG.

FIG. 2 is an overall left side view of the motorcycle.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is a partially enlarged view of FIG. 2;

FIG. 5 is a partially enlarged view of FIG. 2;

FIG. 6 is an overall simplified diagram.

FIG. 7 is a partially enlarged sectional view of FIG. 4;

8 is a partial sectional view taken along line 8-8 in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 8 Front fork 9 Front wheel 16 Engine 25 Cylinder 37 Combustion chamber 46 Fuel injection device 48 High-pressure fuel injection valve (fuel injection valve) 62 Differential pressure regulator 85 Cover body 87 Running wind 88 Opening

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiharu Isaka 2500 Shinkai, Iwata-shi, Shizuoka Yamaha Motor Co., Ltd. (56) References JP-A-62-149585 (JP, A) JP-A-1-32983 ( JP, A) JP-A 1-166268 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02M 69/00 340 B62J 39/00 F02B 61/02

Claims (1)

(57) [Claims] 1. A front panel having a vertically elongated axial center inclined backward.
To the front end of the body frame so that it can be steered.
Attach the front wheel to the lower end of the front fork
A fuel injection valve for mixing and injecting pressurized fuel and pressurized air into an engine cylinder supported by a body frame is provided, and has a vertically long outer shape and extends in the longitudinal direction thereof.
With a diaphragm extending in a direction substantially perpendicular to the axis
A differential pressure regulator that regulates each pressure of the above-mentioned pressurized fuel and pressurized air by these pressures from the side of the vehicle body
On the front side of the body frame
A motorcycle that has a cover attached to the engine side and covers the engine and the differential pressure regulator from the outside of the vehicle body, and an opening for introducing running wind into the cover is formed at the front of the cover. the differential pressure regulator, when the body is viewed from the side of the engine
Just above the cylinder and away from this cylinder
By the way, it is arranged in the opening, and the axis of the differential pressure regulator is
Adjust the differential pressure so that it intersects the tok axis.
This is a fuel injection device for motorcycle engines with a tilted front .