JPH11303702A - Throttle body for fuel injection system for motorcycles - Google Patents

Abstract

(57) [Summary] [Object] To provide a throttle body of a fuel injection device for a two-wheeled vehicle, which has a high degree of freedom in arranging a fuel pump and has excellent workability in mounting the fuel pump. A bottomed bottom is provided on one side of a throttle body, wherein the bottom is provided in parallel with a longitudinal axis XX of the intake passage and one end of which is open toward the downstream of the intake passage. A cylindrical fuel chamber tube 5 is provided. The opening is closed by a lid member 6B formed at the upstream end of the intake pipe 6 to form the fuel chamber F. The longitudinal axis YY of the fuel pump P is accommodated and arranged in the fuel chamber F along the longitudinal axis XX of the intake passage 2.

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 supplying fuel pressurized by a fuel pump to an engine through a fuel injection valve mounted on a throttle body.
Among them, it particularly relates to a throttle body mounted on a motorcycle.

[0002]

2. Description of the Related Art A fuel injection device draws a fuel in a fuel tank, pressurizes and discharges the fuel, a fuel distribution pipe having a fuel injection valve for injecting fuel toward the engine, and a fuel injection device. A throttle body provided with a throttle valve for controlling the amount of air, an intake pipe communicating the throttle body with the engine,
Is provided. In the fuel injection device, a fuel pump is classified into an in-tank type and an in-line type depending on its arrangement. In the in-tank type, the fuel pump is housed and arranged in a fuel tank. In the case of the system, it is arranged in a fuel flow path that connects the fuel tank and the fuel distribution pipe. Here, when the in-line fuel injection device is adopted in a motorcycle,
Such a fuel pump is arranged in a space formed by a fuel tank, an engine, a mission, and the like of a motorcycle.

[0003]

Here, considering the space formed by the fuel tank, the engine, the mission, and the like, the throttle body, the intake pipe, and the fuel distribution pipe constituting the fuel injection device are located in the space. , Etc. are arranged, and the configuration is arranged in an extremely narrow space.
On the other hand, considering the fuel pump, the fuel pump also needs to be arranged in the narrow space. According to the above, the choice of the arrangement of the fuel pump is limited in a narrow space,
It is extremely difficult, and it is also extremely difficult to select an arrangement of the mounting members for fixing the fuel pump to another fixing member (for example, a fuel tank or the like) and to perform the mounting operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a fuel injection device for a motorcycle in which it is particularly difficult to secure a large space, it is possible to improve the degree of freedom of arrangement of a fuel pump and the workability of mounting the fuel pump. The purpose is to aim.

[0005]

According to the present invention, in order to achieve the above object, the fuel in a fuel tank is pressurized by a fuel pump, and the pressurized fuel is supplied to an engine via a fuel injection valve. And a throttle body having a throttle body in which an intake passage penetrates and the opening and closing of the intake passage is controlled by a throttle valve, and an intake pipe communicating the intake passage with the engine. On one side, there is provided a bottomed tubular fuel chamber tubular portion having an opening disposed parallel to the longitudinal axis of the intake passage and having one end opening toward the downstream of the intake passage. The fuel chamber is formed by closing the portion with a lid member integrally formed with a mounting flange formed at the upstream end of the intake pipe, and the longitudinal axis of the fuel pump is provided in the fuel chamber. The first feature is that the housing is arranged along the axis. To.

Further, in addition to the first feature, the present invention has a second feature in that the throttle body and the fuel chamber cylinder are integrally formed and the intake passage and the fuel chamber cylinder are formed by casting. I do.

[0007]

According to the first feature, a fuel chamber is formed on one side of the throttle body along the longitudinal axis of the intake passage and closed by a lid member of the intake pipe. The fuel pump is disposed in the fuel chamber, and the longitudinal axis of the fuel pump is disposed along the longitudinal axis of the intake passage.

According to the second feature, the fuel chamber cylinder and the throttle body are integrally formed, and the intake passage of the throttle body and the fuel chamber cylinder are formed by casting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a throttle body of a motorcycle fuel injection device according to the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a throttle body formed with an intake passage 2 penetrating the inside toward the side. The intake passage 2 is a throttle valve attached to a throttle valve shaft 3 rotatably supported by the throttle body 1. Opening / closing control is performed at 4. At this time, the longitudinal axis XX of the intake path 2 is formed in the horizontal direction in FIG. One side of the intake passage 2 of the throttle body 1 (downward in FIG. 1)
Is integrally formed with a bottomed tubular fuel chamber tubular portion 5. The fuel chamber tube portion 5 is formed parallel to the longitudinal axis XX of the intake passage 2 and has a bottom portion 5A on the left side and an opening portion 5B on the right side. The fuel chamber cylinder 5 and the intake passage 2 of the throttle body 1 are formed along the longitudinal axis XX of the intake passage 2, and the fuel chamber cylinder 5 and the opening 5 </ b> B An opening is formed in a mounting flange 5C formed outside the portion 5, and a downstream portion 2A of the intake path 2 is opened in a mounting flange 1C of the throttle body 1.
The throttle body 1 and the fuel chamber cylinder 5 are
For example, it is formed integrally by die casting, etc.
At the time of such casting, the intake passage 2 and the fuel chamber tube 5 are formed by casting toward the mounting flange 1C of the throttle body 1 and the mounting flange 5C of the fuel chamber tube 5. Reference numeral 5D denotes a fuel inflow passage formed in the bottom 5A of the fuel chamber cylinder 5, and opens to the bottom 5A. J is a known fuel injection valve that injects and supplies fuel into the intake passage 2.

Reference numeral 6 denotes an intake pipe for connecting the throttle body 1 to an engine (not shown). At an upstream end of the intake pipe 6, a mounting flange 6A which is in contact with a mounting flange 1C of the throttle body 1 is formed. . Further, a lid member 6B is integrally formed on the mounting flange 6A downward in the drawing, and the lid member 6B is brought into contact with a mounting flange 5C of the fuel chamber tube portion 5. The intake pipe 6 and the lid member 6
B is also integrally formed by die casting or the like.

That is, when the intake pipe 6 provided with the lid member 6B and the throttle body 1 provided with the fuel chamber cylinder 5 are brought into contact with each other and fastened by bolts (not shown), the mounting flange 1C of the throttle body 1 and the intake pipe 6 Mounting flange 6
A is joined, and the mounting flange 5C of the fuel chamber tube 5 and the lid member 6B are joined. And the fuel chamber cylinder 5
The opening 5B of the fuel chamber tube 5 is closed by the lid member 6B to form a closed fuel chamber F. Reference numeral 6C denotes a fuel discharge passage formed in the lid member 6B, and R denotes an O-ring made of a rubber material for maintaining airtightness at the contact portion.

A fuel pump P is housed and disposed in the fuel chamber F. The fuel pump P is a known fuel pump having a pump section P1 and a motor section P2 as a driving section, and has a tubular shape. The longitudinal axis YY extends in the horizontal direction.
A suction path P3 protrudes and opens at the left end, and a discharge path P4 protrudes and opens at the right end. E denotes a filter provided with a filtering member E1, and a support hole E2 is formed on the right side thereof.

Next, the setting of the fuel pump P will be described. The filter E is inserted from the opening 5B of the fuel chamber cylinder 5 toward the bottom 5A, and then the fuel pump P is arranged in the fuel chamber cylinder 5. According to this, the suction passage P3 of the fuel pump P is inserted and arranged in the support hole E2 of the filter E arranged at the bottom 5A. Next, the mounting flange 6A of the intake pipe 6 is connected to the mounting flange 1C of the throttle body 1.
The cover member 6B is disposed on the mounting flange 5C of the fuel chamber tube 5, and the mounting flanges are fastened by bolts (not shown) in this state. According to the above, the opening 5B of the fuel chamber cylinder 5 is closed by the lid member 6B to form a sealed fuel chamber F. The fuel pump P is housed and arranged in the fuel chamber F, The suction path P3 is supported by the support hole E2 of the filter E, and the discharge path P4 is supported by the discharge path 6C of the lid member 6B.

According to the above set, the fuel pump P is disposed in the fuel chamber F, and the longitudinal axis YY of the fuel pump P is disposed along the longitudinal axis XX of the intake passage 2.

The fuel inflow path 5D is connected to a fuel tank (not shown), and the fuel discharge path 6C is connected to a fuel distribution pipe (not shown). Therefore, when the motor section P2 of the fuel pump P is driven to rotate the pump section P1, the fuel in the fuel tank passes through the filter section P1 and the pump section P1 via the suction passage P3.
The fuel that is sucked into the fuel tank and pressurized by the pump unit P1 is supplied to the fuel distribution pipe via the discharge path P4, and the fuel in the fuel distribution pipe is injected and supplied to the intake path 2 via the fuel injection valve J. .

Here, according to the present invention, the fuel chamber F is formed parallel to the longitudinal axis XX of the intake passage 2 of the throttle body 1 and the longitudinal axis of the fuel pump P is formed in the fuel chamber F. Since YY is disposed along the longitudinal axis XX of the intake passage 2, the fuel pump P can be disposed near the throttle body 1 and the fuel pump P can be disposed on the projection surface of the intake passage 2 (from above in FIG. 1). (In the plane seen from above), whereby the fuel pump P can be easily arranged in a narrow space of the motorcycle.

Further, a fuel chamber F for accommodating the fuel pump P is provided.
Is formed by the throttle body 1 and the intake pipe 6, so that the fuel chamber F can be formed without preparing a specially new member.

Further, according to the arrangement of the fuel pump P in the fuel chamber F, it is not necessary to prepare a special new mounting member for mounting the fuel pump P to another fixing member.
Further, the assemblability of the fuel pump can be improved.

The fuel pump P is disposed in the vicinity of the intake passage 2. The heat generated in the motor of the fuel pump P prevents the temperature of the intake passage 2 from decreasing. Temperature rise is suppressed. If the intake path 2 is considered, the atomization of the fuel is improved as described above, and if the fuel in the fuel chamber F is considered, generation of vapor is suppressed.

Further, since the throttle body 1 and the fuel chamber cylinder 5 are integrally formed by casting or the like and the intake passage 2 and the fuel chamber cylinder 5 are formed by casting, the manufacturing cost can be reduced. it can. Also, the opening 5 of the fuel chamber tube 5
B is closed and the lid member 6B for forming the fuel chamber F is formed integrally with the intake pipe 6, so that the parts can be shared and the assembly can be shared, and the manufacturing cost can be reduced.

[0021]

As described above, according to the present invention, one side of the throttle body is provided with an opening which is disposed parallel to the longitudinal axis of the intake passage and has one end opening toward the downstream of the intake passage. A fuel chamber tubular part having a bottomed tubular shape is provided, and the opening is closed with a lid member integrally formed with a mounting flange formed at the upstream end of the intake pipe to form a fuel chamber, By arranging the longitudinal axis of the fuel pump along the longitudinal axis of the intake passage in the fuel chamber, the fuel pump P can be easily arranged in the narrow space of the motorcycle, and the degree of freedom of the arrangement of the fuel pump is increased. It can be greatly improved. Further, formation of a fuel chamber for accommodating the fuel pump and mounting for fixing the fuel pump can be performed at extremely low cost. or,
By the heat generated in the fuel pump, the intake path can be effectively warmed, the atomization of the fuel can be improved, and the rise in the fuel temperature in the fuel chamber can be suppressed. Furthermore,
Since the throttle body and the fuel chamber cylinder are integrally formed, and the intake passage and the fuel chamber cylinder are formed by casting, the manufacturing cost can be reduced. Further, since the lid member forming the fuel chamber is formed integrally with the intake pipe, the manufacturing cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a throttle body in a fuel injection device for a motorcycle according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throttle body 2 Intake path XX Longitudinal axis of intake path 5 Fuel chamber cylinder 5B Opening of fuel chamber cylinder 6 Intake pipe 6B Cover member F Fuel chamber P Fuel pump

Claims (2)

[Claims] 1. The fuel in a fuel tank is pressurized by a fuel pump, the pressurized fuel is injected and supplied to an engine via a fuel injection valve, and an intake passage penetrates the inside of the fuel tank. In a fuel injection device for a motorcycle including a throttle body controlled to be opened and closed by a valve, and an intake pipe communicating an intake passage and an engine, a longitudinal axis X- of an intake passage 2 is provided on one side of the throttle body 1. A bottomed cylindrical fuel chamber tube portion 5 having an opening portion 5B which is arranged in parallel along X and has one end opening toward the downstream of the intake passage 2 is provided. Mounting flange 6 formed at upstream end
A fuel chamber F is formed by being closed by a lid member 6B formed integrally with A, and the longitudinal axis YY of the fuel pump P is changed to the longitudinal axis XX of the intake passage 2 in the fuel chamber. A throttle body in a motorcycle fuel injection device housed and arranged along. 2. A throttle body in a fuel injection device for a motorcycle according to claim 1, wherein said throttle body and said fuel chamber tube portion are integrally formed, and said intake passage and said fuel chamber tube portion are cast and formed.