JPH084623A - Fuel delivery valve - Google Patents

Abstract

PURPOSE:To prevent vibration and noise from being generated by improving a connecting structure of a socket part of a fuel delivery pipe to a fuel injector for supplying fuel to an injection nozzle, decreasing man-hours required for machining and assembling, and decreasing its weight. CONSTITUTION:An annular groove 14 to which a C-shaped snap ring 15 made of elastic materials is to be attached is formed on the inner surface of a cylindrical socket 11, and a shoulder part of an injector 70 is held and fixed by the C-shaped snap ring 15. Thereby, a projecting collar part for screwing on the upper part of the cylindrical socket 11 is not required, the outer periphery of the socket 11 is made into the complete circular shape, the materials are decreased, the machining is facilitated, its own weight is deceased, and generation of vibration and noise is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for supplying fuel fed from a fuel pressure pump of a fuel injection type automobile engine to each intake passage or each cylinder of the engine through a fuel injector (injection nozzle). The present invention relates to an improvement of the fuel delivery pipe, particularly to a connection structure for fixing the fuel injector in the socket (injector housing).

[0002]

2. Description of the Related Art As an example of a fuel delivery pipe, a typical structure of a fuel delivery pipe for injecting fuel toward three cylinders on one side of a fuel injection type V-6 cylinder engine is shown in FIG. This fuel delivery pipe 60 is connected so that three cylindrical sockets 61 that receive the introduction shaft (cylindrical portion) of the fuel injector 70 (FIG. 6) communicate with each other internally through a communication pipe 62. They are arranged at regular intervals. These sockets 61 are made by cutting a forged product, and a part of the inner peripheral surface is extremely high in order to receive the O-rings 71 and 72 (Fig. 6) on the fuel injector side so that complete liquid tightness can be achieved. A burnishing process having roundness and smoothness is applied.

The cylindrical wall 63 of each socket is provided with an opening penetrating in a direction orthogonal to the central axis and at a diametrical center position or a slightly eccentric position, and the connection end of the communicating pipe 62 is fitted into this opening. It is fixed by brazing. Tube wall 63
A flange portion 65 having a bolt hole is projectingly provided on the outer left and right sides of the upper end of the cap, and a cap 66 for pressing the shoulder portion of the fuel injector 70 is fastened with a screw 67.

The fuel delivery pipe 6 shown in FIG.
0 is a type called bottom flow type, and as shown in FIG. 6, fuel is injected through the center of the socket, so it is less susceptible to the effects of vapor and the mounting height is reduced. The advantage is that

As shown in FIGS. 5 and 6, in a conventional bottom flow type fuel delivery pipe connecting structure of a fuel injector and a socket, a flange portion 65 projecting horizontally is provided above each socket 61. Since it has to be provided, a large wall thickness is required in this portion, the raw material for forging becomes large, the number of machining steps increases, and the cost rises. In addition, the weight of the entire fuel delivery pipe is increased, which not only adds extra weight to the engine, but also causes vibration and noise.

In Japanese Utility Model Laid-Open No. 62-152073, "Fixed Support Device for Fuel Injection Valve", a fuel injector is housed in a cylindrical socket and its head is pressed by a bracket. However, it is difficult to adopt the fixing method as shown in the figure, because the head of the fuel injector has a connector for wiring connection.

[0007]

SUMMARY OF THE INVENTION The main object of the present invention is to improve the connection structure between the socket portion and the fuel injector in the fuel delivery pipe.
It is to reduce the man-hours for machining and assembling fuel delivery pipes. Another object of the present invention is to
This is to reduce the weight of the fuel delivery pipe and prevent vibration and noise.

[0008]

The above-described object of the present invention is to provide a fuel delivery pipe in which a plurality of cylindrical sockets for receiving an introduction shaft of a fuel injector are arranged at predetermined intervals via a communication pipe. An annular groove for mounting a C-shaped retaining ring made of an elastic material is formed on the inner surface of the cylindrical socket, the fuel injector is inserted into the socket, then the C-shaped retaining ring is mounted, and the shoulder portion of the fuel injector is attached to This is accomplished by a fuel delivery pipe configured such that the fuel injector is secured within the socket by holding it down with a C-shaped retaining ring.

[0009]

According to this structure, the projecting flange portion for screwing, which is required in the conventional case, is not required at the upper part of the cylindrical socket, and the outer circumference of the socket becomes a perfect circle, which greatly reduces the material. , Machining becomes extremely easy. Moreover, since screwing is unnecessary, the number of assembling steps is significantly reduced. In addition, the weight is reduced, which in turn reduces the generation of vibrations and noise.

Since the C-shaped retaining ring is made of an elastic material such as spring steel or plastic, it is extremely easy to install and has the advantage that it does not fall off during use like a screw. .

In a further preferred embodiment, an annular elastic ring having an outer diameter substantially equal to the outer diameter of the fuel injector is inserted into the socket before mounting the C-shaped retaining ring, and the elastic ring and the C-shaped retaining ring are inserted. The ring allows the fuel injector to be resiliently retained within the socket, eliminating gaps due to dimensional variations.

As a further embodiment, if a recess for preventing rotation of the injector is provided in the circumferential portion of the upper end of each cylindrical socket, the injector itself rotates and the connection wiring is impossible. The advantage is that the twisting force can be prevented from acting. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0013]

1 and 2 show a socket portion of a fuel delivery pipe 10 according to the present invention, which is the same as the structure shown in FIG. 5 except for the socket portion. According to the invention, the inner surface of each cylindrical socket 11 is formed with an annular groove 14 for mounting a C-shaped retaining ring 15 made of elastic material, for example made of spring steel. Injector 7
As is well known, a pair of electrode terminals 17 and a terminal cover 18 are provided on the upper part of 0.

The fuel injector 70 has the same structure as the conventional fuel injector.
It is inserted into the socket 11 with the O-rings 71 and 72 attached. If the C-shaped retaining ring 15 is installed in the cylindrical socket 11 after the fuel injector 70 is inserted, the C-shaped retaining ring 15 is retained in the annular groove 14 by its elastic force and is naturally detached from the annular groove 14. There is nothing to do. Thus, the fuel injector 70 is fixed in the cylindrical socket 11 by the C-shaped retaining ring 15.

FIG. 3 shows another embodiment of the present invention,
Before inserting the C-shaped retaining ring 15 into the cylindrical socket 11,
An annular elastic ring 21 having an outer diameter substantially equal to the outer diameter of the fuel injector 70 was inserted into the socket, and the elastic ring 21 and the C-shaped retaining ring 15 elastically retained the fuel injector 70 in the socket. Here is an example. The elastic ring 21 can be made of rubber or plastic in addition to a spring metal material.

According to this embodiment, the elastic ring 21 has the effect of eliminating the gap between the C-shaped retaining ring 15 and the annular groove 14 caused by the variation in dimensions. The elastic ring 21 can have an increased elastic holding force by forming the upper surface in contact with the C-shaped retaining ring 15 in a tapered shape or by forming a corrugated cross-sectional shape (a wave ring).

FIG. 4 shows still another embodiment of the present invention, in which a rotation preventing recess 43 for preventing rotation of the injector is formed in the circumferential portion of the upper end of each cylindrical socket 41. The terminal cover 48 is housed in the recess 43 to prevent the injector itself from rotating in the socket.

[0018]

As described above in detail, according to the present invention, the upper portion of the cylindrical socket does not need a protruding flange portion for screwing as in the conventional case, and the outer circumference of the socket is a perfect circle. The material is greatly reduced and machining becomes extremely easy. Moreover, since screwing is unnecessary, the number of assembling steps is significantly reduced. Further, the weight is reduced and the generation of vibration and noise is reduced. Since the C-shaped retaining ring is made of an elastic material, it is extremely easy to install and has the advantage that it does not come loose and fall off during use like a screw, and its technical effect is extremely remarkable. There is something.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a socket portion of a fuel delivery pipe according to the present invention.

FIG. 2 is a plan view showing a socket portion.

FIG. 3 is a vertical sectional view showing another embodiment of the present invention.

FIG. 4 is a plan view A showing another embodiment of the socket portion,
It is the longitudinal cross-sectional view B which follows the BB line.

FIG. 5 is a perspective view showing an entire conventional fuel delivery pipe.

6 is a partially cutaway vertical sectional view of the fuel delivery pipe of FIG. 5 cut along the axial direction.

[Explanation of symbols]

 10 Fuel Delivery Pipe 11, 41 Socket 14 Annular Groove 15 C-Type Retaining Ring 17 Electrode Terminal 18, 48 Terminal Cover 21 Elastic Ring 43 Detent Detent 70 Fuel Injector 71, 72 O-ring

Claims (4)

[Claims] 1. A fuel delivery pipe in which a plurality of cylindrical sockets for receiving an introduction shaft of a fuel injector are arranged at predetermined intervals via communication pipes. An annular groove for mounting the retaining ring is formed, the C-shaped retaining ring is mounted after inserting the fuel injector into the cylindrical socket, and the shoulder portion of the fuel injector is pressed by the C-shaped retaining ring. A fuel delivery pipe characterized by being fixed in the socket. 2. The fuel delivery pipe according to claim 1, wherein the C-shaped retaining ring is made of spring steel. 3. Before mounting the C-shaped retaining ring, an annular elastic ring having an outer diameter substantially equal to the outer diameter of the fuel injector is inserted into the socket, and the elastic ring and C
3. The fuel delivery pipe according to claim 1, wherein the fuel injector is elastically held in the socket by the shape retaining ring. 4. The fuel delivery pipe according to claim 1, wherein a detent hole for preventing rotation of the injector is provided in a circumferential portion of an upper end of each cylindrical socket.