JP2571496B2 - Fuel pressure control device - 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 pressure control device in which a fuel pressure regulating valve is provided at an end of a fuel distribution pipe to a fuel injection valve of a fuel injection type internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a fuel distribution pipe to a fuel injection valve of a fuel injection type internal combustion engine and a fuel pressure regulating valve have been connected as shown in FIGS. That is, a flange 33 having a connector 32 is fixed to one side of the fuel pressure regulating valve 31. When the connector 32 is inserted into the fuel passage 35 of the fuel distribution pipe 34, the flange 33 is The fuel pressure regulating valve 31 and the fuel distribution pipe 34 are connected by abutting against the side wall 36 of the fuel distribution pipe 34 and inserting a bolt 37 between the flange 33 and the side wall 36.

[0003]

As described above, the fuel pressure regulating valve 31 and the fuel distribution pipe 34 are connected by the flange 33 and the connector 32, but there is a bolt tightening process at the time of the connection, which is troublesome. In addition, since the bolts are tightened, there is a possibility that the user can easily disassemble and cause an unexpected trouble. Further, since the flange 33 and the connector 32 are attached to the fuel pressure regulating valve 31, there is a problem that it is difficult to reduce the size and weight of the fuel pressure regulating valve 31.

The present invention has been made in view of such problems, and it is an object of the present invention to connect a fuel pressure regulating valve to a fuel distribution pipe very easily and easily and to disassemble it. Another object of the present invention is to provide a fuel pressure control device that can be reduced in size and weight.

[0005]

In order to achieve the above object, a fuel pressure control device according to the present invention has a through-hole formed in a direction substantially perpendicular to a fuel passage in a fuel distribution pipe. A pressure regulating valve is provided, and a leaf spring having an annular ring engaged with a flange portion of the fuel pressure regulating valve is locked to a locking member formed on the upper surface of the distribution pipe. .

Further, the leaf spring includes a first claw extending radially upward after extending upward on the outer periphery of the annular ring, and a second claw extending radially upward after extending on the outer periphery of the annular ring. It is characterized by having.

[0007]

With the fuel pressure control device constructed as described above, with the fuel pressure control valve installed in the through hole, an annular ring is superimposed on the flange portion of the fuel pressure control valve to form a leaf spring. When rotated, the leaf spring is locked by the locking member, and the fuel pressure regulating valve and the fuel distribution pipe are easily connected. Since the fuel pressure regulating valve does not require a flange and a connector as in the conventional example, the fuel pressure regulating valve can be reduced in size and weight.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a state in which a fuel pressure regulating valve 1 is connected to a fuel distribution pipe 2. The fuel pressure regulating valve 1 has a casing 6 having a negative pressure introducing pipe 3 and a diaphragm 4 sandwiching a diaphragm 5, and a valve assembly 7 inside the return pipe 8.
Body 10 having a fuel communication hole 9 formed on the side of the body 10
It is composed of

The fuel distribution pipe 2 has a fuel passage 11 for distributing fuel to each fuel injection valve (not shown) of the fuel injection type internal combustion engine as shown in FIGS. 2 to 4, and a direction substantially perpendicular to the passage 11. And locking members 13 and 13 formed on the upper surface. The locking member 13 has an upper side surface including a horizontal portion 14, a rising portion 15 at a central portion, and a horizontal portion 16 following the same, an inclined surface 17 inclined downward from one end, a rising portion 18 at a central portion, and It consists of two projections with a lower surface consisting of a horizontal part 19 that follows.

A leaf spring 21 having an annular ring 20 engaged with the flange portion 4 of the fuel pressure regulating valve 1 comprises:
As shown in FIGS. 5 and 6, a first claw 22 extending upwardly to the outer periphery of the annular ring 20 and then extending radially, and a second claw 23 extending radially to the outer periphery of the annular ring 20 and extending upwardly And The first claw 22 and the second claw 23 are respectively arranged at two places in parallel in plan view (see FIG. 5).

In order to assemble the fuel pressure control device having the above configuration, the fuel pressure regulating valve 1 is installed in the through hole 12 of the fuel distribution pipe 2 such that the fuel communication hole 9 matches the fuel passage 11. Thereafter, the annular ring 20 of the leaf spring 21 is superimposed on the flange portion 4 of the fuel pressure regulating valve 1 and the leaf spring 21 is rotated clockwise. The locking member 13 is sandwiched between the second pawl 22 and the second claw 23. Then, after passing through the inclined portion 17, the second claw 23 attempts to advance from the rising portion 18 to the horizontal portion 19. At that time, the first claw 22 passes through the horizontal portion 14 and contacts the rising portion 15. Therefore, the clockwise rotation of the leaf spring 21 cannot be further increased. In addition, even if it is attempted to rotate in the opposite direction, since the second claw 23 is in contact with the rising portion 18, the rotation of the leaf spring 21 in the opposite direction is also prevented, and as a result, the fuel pressure regulating valve 1 And the fuel distribution pipe 2 are securely assembled.

In order to remove the fuel pressure regulating valve 1 assembled in this manner, the second claw 23 must be easily removed without using a special tool that moves over the step from the rising portion 18. I can't do that.

[0013] Then, the assembled fuel pressure control device includes:
As in the conventional example, when the pressure in the fuel passage 11 becomes larger than the pressure in the chamber communicating with the negative pressure introducing pipe 3, the diaphragm 5 is raised and the fuel passage 11 is moved by the valve assembly 7.
And the return pipe 8 communicate with each other to adjust the pressure in the fuel passage 11.

FIG. 7 shows another embodiment, in which the shapes of the locking member and the leaf spring are different from those of the previous embodiment. That is, the locking member 13 has holes 24, 24 penetrating vertically, and the plate spring 2
1 has claws 25, 25 extending radially on the outer periphery of the annular ring 20 and then extending upward. Therefore, after the fuel pressure regulating valve 1 is installed in the through hole 12 of the fuel distribution pipe 2, the annular ring 20 of the leaf spring 21 is superimposed on the flange portion 4 of the fuel pressure regulating valve 1, and the leaf spring 21 is turned clockwise. The claw 25 passes through the back surface of the locking member 13,
When the tip of the claw 25 reaches the hole 24, the claw 25 enters the hole 24 and prevents the leaf spring 21 from further rotating. In this embodiment as well, the assembled fuel pressure regulating valve 1 cannot be easily removed without using a special tool for extracting the claw 25 from the hole 24.

[0015]

In the fuel pressure control device according to the present invention, the fuel pressure adjusting valve and the fuel distribution pipe are connected only by rotating the leaf spring by overlapping the annular ring on the flange portion of the fuel pressure adjusting valve. The connection is simple and easy. Since the fuel pressure regulating valve does not require a flange and a connector as in the conventional example, the fuel pressure regulating valve can be reduced in size and size.
Weight reduction becomes possible.

Further, since the connected fuel pressure control device cannot be easily disassembled, the device is safe to use.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fuel pressure control device according to the present invention.

FIG. 2 is a sectional view of a fuel distribution pipe according to the present invention.

FIG. 3 is a cross-sectional view taken along the line II in FIG. 2;

FIG. 4 is a cross-sectional view taken along a roller in FIG. 2;

FIG. 5 is a plan view of a leaf spring according to the present invention.

FIG. 6 is a sectional view taken along a line C-C of FIG. 5;

FIG. 7 is a partial sectional view of another embodiment of the fuel pressure control device according to the present invention.

FIG. 8 is a sectional view of a conventional fuel pressure control device.

FIG. 9 is a partial cross-sectional side view of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fuel pressure regulating valve 2 fuel distribution pipe 4 flange 11 fuel passage 12 through hole 13 locking member 20 annular ring 21 leaf spring 22 first claw 23 second claw 25 claw

Claims (2)

(57) [Claims] 1. A fuel pressure regulating valve installed at an end of a fuel distribution pipe to a fuel injection valve of a fuel injection type internal combustion engine,
A leaf spring having a through hole formed in a direction substantially perpendicular to a fuel passage in the distribution pipe, the fuel pressure regulating valve being installed in the through hole, and an annular ring engaging with a flange portion of the fuel pressure regulating valve. A fuel pressure control device, wherein the fuel pressure control device is locked by a locking member formed on an upper surface of the distribution pipe. 2. The leaf spring includes a first claw extending radially upward from an outer periphery of the annular ring and extending radially outward, and a second claw extending radially from the outer periphery of the annular ring and extending upwardly. The fuel pressure control device according to claim 1, wherein