JPH0424546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel supply device for supplying fuel to an internal combustion engine.

[Prior art]

Conventionally, fuel control devices such as fuel dampers and fuel pressure regulators are attached to fuel distribution pipes by screwing from the outside, and the amount of protrusion from the distribution pipe is large, which is not desirable for vibration resistance.

Furthermore, a method has been devised in which the case of the fuel control device is integrally fixed to the fuel distribution pipe together with the diaphragm, but the amount of protrusion is still large.

For example, the configuration disclosed in Japanese Patent Application Laid-Open No. 55-5429 is known, but in this configuration, the fuel control device is attached to the outside of the fuel distribution pipe, so the shape is complicated and the amount of protrusion of the fuel control device is large. Not only,
There has been a problem in that unnecessary stress is applied to the movable parts of the fuel control equipment when it is assembled to the fuel distribution pipe, making it impossible to obtain the desired performance and requiring adjustment after assembly.

It is also known to incorporate the fuel control device inside the end of the fuel distribution pipe, as shown in Japanese Utility Model Application Publication No. 55-20620, but the fixed structure disclosed in this publication is the main body of the fuel control device. Because it is designed to be directly screwed or press-fitted into the fuel distribution pipe, unnecessary stress is applied to the fuel control equipment, making it necessary to strengthen the structure of the fuel control equipment.

[Problem to be solved by the invention]

In view of the problems of the prior art as described above, the present invention aims to improve earthquake resistance by reducing the amount of protrusion of the fuel control device from the fuel distribution pipe, and to reliably and easily assemble the fuel control device to the fuel distribution pipe. This was done with the aim of preventing problems such as unnecessary stress being applied to the fuel control equipment during assembly, making it impossible to obtain the desired performance.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a fuel pump that pumps fuel from a fuel pump;
In a fuel supply system that includes a fuel distribution pipe that distributes fuel pumped from the fuel pump to each fuel injection valve, and a fuel control device that controls the fuel in this fuel distribution pipe, a movable part that operates according to the fuel is provided. a main body portion formed to protrude annularly from the outer periphery of a case of the fuel control device accommodated therein; and a stepped portion formed by enlarging the diameter of the inner end of the fuel distribution pipe into which the annular main body portion is fitted. and a fixing means for inserting the main body part between the step part and fixing the fuel control device inside the fuel distribution pipe.

[Effect]

According to the configuration of the present invention described above, since the fuel control device is assembled inside the fuel distribution pipe, the fuel control device does not protrude in the radial direction of the fuel distribution pipe, and the overall shape becomes simple.

Further, the fuel control device includes an annular main body on the outer periphery of the case, and is fixed by being inserted between the step and the fixing means. This prevents problems such as the stress for fixing affecting the internal structure of the fuel control device, especially the movable parts that operate depending on the fuel, making it impossible to obtain the desired performance.

Furthermore, since the main body is inserted between the stepped portion and the fixing means and fixed, it is easy to insert and fix from the end of the fuel distribution pipe, and the workability of assembling the fuel control device is improved.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings. In FIG. 1 showing the overall configuration, fuel is pumped from a fuel tank 1 by an electric fuel pump 2, and a fuel filter 3 is disposed between the tank 1 and the pump 2.

The pressure-fed fuel is introduced into the fuel distribution pipe 10 and distributed to each fuel injection valve 5 from here.

The fuel distribution pipe 10 has a substantially cylindrical shape, and is formed with a fuel inlet 11, a return port 12 for returning surplus fuel to the tank 1, and a fuel outlet 13 into which the fuel injection valve 5 is inserted.

A fuel damper 20 for controlling and suppressing fuel pulsation is housed and included inside the left end of the fuel distribution pipe 10.
It is fixed by a fixture, and on the other hand, a fuel pressure regulator 40 for controlling and adjusting the fuel pressure is housed and contained inside the right end portion, and is fixed by a fixture. Note that the intake pipe negative pressure V of the engine is introduced into the regulator 40.

In FIG. 2 showing an enlarged view of the left end of the fuel distribution pipe 10, the fuel damper 20 includes a substantially cylindrical main body 21, a housing 22, a case 23, a diaphragm 24, a guide 25, a coil spring 26, a spring receiver 27, etc. It consists of

A fuel passage 28 is formed in the housing 22, and a stopper 29 is fixed by welding. The housing 22 is further fixed to the main body 21 together with a gasket 30.

A case 23 is welded and fixed to the main body 21, and an air vent pipe 31 is welded and fixed to the case 23.

The diaphragm 24 is connected to the fuel chamber 14 of the distribution pipe 10.
The air chamber 32 is divided into two parts. diaphragm 24
The outer edge of the housing 22 is fixedly fixed, and the central part is fixedly fixed by a spring receiver 27 and a guide 25.

A spring 26 is provided within the air chamber 32,
The diaphragm 24 is biased to the right in the figure. The set load of the spring 26 can be arbitrarily set depending on the amount of deformation of the case 23.

The main body 21 of the fuel damper 20 is connected to the fuel distribution pipe 10
A sealing O-ring 33 is placed on the enlarged inner peripheral surface of the
The distribution pipe 10 is inserted through the diaphragm 24 at a different position from the fixed position of the diaphragm 24 by means of a ring (fixing device) 34 such as a circlip.
is fixed. A groove 15 is formed on the inner circumference of the distribution pipe 10.
A ring 34 is inserted into this groove 15. Note that the ring 34 is removable,
Therefore, the entire fuel damper is also removable from the fuel distribution pipe 10.

In FIG. 3 showing an enlarged view of the right end portion of the fuel distribution pipe 10, the fuel pressure regulator 40 includes a substantially cylindrical main body 41, a housing 42, and a case 4.
3, diaphragm 44, valve body 45, valve seat member 4
6, a coil spring 47, a spring receiver 48, etc.

A fuel passage 49 is formed in the housing 42, and a valve seat member 46 is welded and fixed to the center of the fuel passage 49. The housing 42 further includes a gasket 5.
0 and is caulked and fixed to the main body 41.

A case 43 is welded and fixed to the main body 41, and a pipe 51 is welded and fixed to the case 43 for introducing negative pressure into the intake pipe.

The diaphragm 44 is connected to the fuel chamber 14 of the distribution pipe 10.
The negative pressure chamber 52 is divided into two parts. diaphragm 44
The outer edge of the housing 42 is fixed to the housing 42, and the center part is fixed to the spring receiver 48 by a holder 53.

The valve seat member 46 has a substantially tubular flange portion, and is inserted into and connected to the fuel return port 12 of the distribution pipe 10 via a sealing O-ring 54 . This fuel return port 12 is located in the fuel chamber 1.
4, and the valve seat member 46 faces the valve body 45.

The valve body 45 is welded and fixed to a ball 55, and is rotatably supported by the ball 55 with respect to the support body 53.

A spring 47 is provided at the spring receiver 48, and this spring 47 urges the diaphragm 44 to the left in the figure. Note that the set load of the spring 47 can be arbitrarily set depending on the amount of deformation of the case 43.

The main body 41 of the fuel pressure regulator 40 has an O for sealing on the enlarged inner peripheral surface of the fuel distribution pipe 10.
It is inserted through a ring 56, housed and enclosed, and is fixed to the distribution pipe 10 at a position different from the fixed position of the diaphragm 44 by a ring (fixing device) 57 such as a circlip. A groove 16 is formed on the inner periphery of the distribution pipe 10, and a ring 57 is fitted into this groove 16. Note that the ring 57 is removable, and therefore the entire fuel pressure regulator 40 is also removable from the fuel distribution pipe 10.

In the above configuration, in the fuel damper 20, fuel pressure is always acting on the diaphragm 24, and is balanced with the set load of the spring 26.
The flow from the pump 2 and the pulsation when the injection valve 5 is activated are absorbed by the movement of the diaphragm 24.

Here, since the fuel damper 20 is contained within the distribution pipe 10 and is fixed to the distribution pipe 10 with a fixture, the number of parts for connection can be reduced compared to conventional connection methods, and the protruding parts can be reduced. This can improve vibration resistance and sealing performance.

Moreover, in the fuel pressure regulator 40,
The pressure in the fuel chamber 14 is constantly acting on the diaphragm 43, and when this pressure becomes higher than a predetermined value, the valve body 44 opens the valve seat 46 to release excess fuel to the tank 1 and adjust the fuel pressure.

Here, like the damper 20, the regulator 40 is also housed and included in the distribution pipe 10 and is fixed to the distribution pipe 10, so the number of parts can be reduced compared to the conventional coupling method, and the number of protruding parts can be reduced. This improves vibration resistance and sealing performance.

In addition, if the fuel control equipment is fixed with a removable fixture such as a circlip, the equipment itself can also be removed and serviced, making it easier to service and maintain, which is advantageous over conventional systems where the diaphragm is integrally installed. It is.

In addition, the main bodies 21 and 41 of the fuel control equipment fix the diaphragms 24 and 44 at the center side of the distribution pipe 10, and are fixed to a fixture at the end side, so that the fixed position of the diaphragm and the fixed position to the distribution pipe are fixed. Since the springs 26 and 47 are separated from each other, the spring force of the springs 26 and 47 does not act on the fixing positions of the main body and the distribution pipe, improving the reliability of fixing.

Note that if there is no need for attachment and detachment, the ring 2 may be omitted and the end of the fuel distribution pipe 10 may be tightened to secure the device. In this case, compared to the conventional method, there remains the advantage that the spring load is not applied to the receptacle (fixed position), so reliability is high.

〔Effect of the invention〕

As described above, according to the present invention, the fuel distribution pipe and the fuel control device can be configured compactly, and a device with excellent earthquake resistance can be provided, while unnecessary stress is not applied to the fuel control device during assembly. This has the advantage that it is possible to prevent problems that may occur when the desired performance cannot be obtained due to the mounting, and that it can be reliably fixed with simple assembly.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention;
2 and 3 are enlarged cross-sectional views showing essential parts of the fuel distribution pipe shown in FIG. 1. 1...Fuel tank, 2...Fuel pump, 5...
Fuel injection valve, 10... Fuel distribution pipe, 20, 40...
...Fuel damper, fuel pressure regulator, 21, 41...Main body, 24, 44..., which constitutes fuel control equipment.
Diaphragm, 26, 47...Coil spring, 3
4,57...Fixing tool.

Claims (1)

[Claims] 1. A fuel pump that pumps fuel from the fuel pump, a fuel distribution pipe that distributes the fuel pumped from the fuel pump to each fuel injection valve, and a fuel control that controls the fuel in the fuel distribution pipe. a fuel supply device comprising: a main body formed annularly protruding from the outer periphery of a case of the fuel control device that accommodates a movable part that operates according to fuel; and a diameter of the inner end of the fuel distribution pipe. a step portion formed by enlarging the main body portion and into which the annular main body portion is fitted; and a fixing means for inserting the main body portion between the step portion and fixing the fuel control device inside the fuel distribution pipe. A fuel supply device comprising: 2. The fuel supply device according to claim 1, wherein the fuel control device comprises a fuel damper that controls fuel pulsation. 3. The fuel supply system according to claim 1, wherein the fuel control device comprises a fuel pressure regulator that controls fuel pressure. 4. The fuel supply device according to claim 1, wherein the fixing means is a removable fixture. 5. The fuel control device includes: an annular main body; a diaphragm supported by the main body and into which fuel is introduced on one side; a case supported by the main body and covering the other side of the diaphragm; and the case. 2. The fuel supply device according to claim 1, further comprising a coil spring housed within the diaphragm and biasing the diaphragm.