JPH0213751Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an inspection device for inspecting the fuel injection state of a fuel injection valve for an internal combustion engine.

<Prior Art> As a conventional inspection device of this type, there is one shown in FIG.

To explain this, a rubber fuel hose 2 is connected to a fuel inlet of a fuel injection valve 1. Then, the nipple 3 of the inspection device 4, which has one end connected to a fuel supply source (not shown) and the bamboo shoot-shaped nipple 3 connected to the other end, is press-fitted into the fuel hose 2, and fuel is supplied to the fuel injection valve 1. The state of fuel injection and the state of fuel leakage from the injection valve section (see Fig. 2) are inspected, and after the inspection is completed, the nipple 3 is pulled out from the fuel hose 2 and other fuel injection valves are similarly inspected.

By the way, in such a conventional inspection device, since the tip of the nipple 3 has a bamboo shoot shape with several approximately conical slopes 3a stacked, the nipple 3 is press-fitted into the fuel hose 2. There was a problem in that when the fuel hose 2 was pulled out from the fuel hose 2, the inner surface of the fuel hose 2 was damaged by the corner 3b on the proximal end side of the slope 3a.

In addition, due to variations in the inner diameter of the fuel hose 2, the nipple 3 may come off from the fuel hose 2 due to fuel pressure during fuel supply, or dirt may easily adhere to the nipple 3. There have been various problems such as getting into the fuel hose 1 and changing the injection performance of the injection valve 1, and making it difficult to attach and detach the nipple 3 to and from the fuel hose 2.

<Purpose of the invention> The present invention was devised in view of these conventional problems, and has a simple and highly reliable structure that utilizes the elasticity of an elastic body to attach to a fuel hose. An object of the present invention is to provide an inspection device for a fuel injection valve for an internal combustion engine that solves all of the above problems.

<Structure of the invention> For this reason, the present invention provides a cylindrical guide rod that can be freely inserted into a fuel hose made of an elastic material connected to a fuel inlet of a fuel injection valve for an internal combustion engine, and the guide rod. a clamp rod that is inserted into the fuel hose so as to be freely movable in the axial direction; a flange formed at the tip of the clamp rod that protrudes from the tip opening surface of the guide rod that faces the inside of the fuel hose; and a tip surface of the guide rod. An elastic ring with a freely expandable cross-sectional shape inserted between the
The clamp rod is pulled and fixed to the guide rod in the direction of pulling it out from the fuel hose, and the elastic ring is compressed in the axial direction, so that the expanding outer peripheral surface of the elastic ring is brought into close contact with the inner peripheral surface of the fuel hose. The above-mentioned object is achieved by providing and configuring a fuel passageway that guides fuel into the fuel hose from the tip end closer to the fuel injection valve than the elastic ring through the inside of the clamp rod at least in the clamped state. It was designed to do so.

<Example> An inspection device for a fuel injection valve for an internal combustion engine according to an example shown in FIGS. 3 to 5 will be described below.

A cylindrical guide rod 1 is installed in a rubber fuel hose 11 attached to the fuel inlet of the fuel injection valve of the engine.
3 and a clamp rod 12 which is fitted into the guide rod 13 so as to be freely movable in the axial direction, there is an O-ring 1 made of an elastic body whose cross section can be freely expanded and contracted, as will be described later.
4 is inserted with a gap between it and the inner peripheral surface of the fuel hose 11.

A flange portion 12a having the same outer diameter as the guide rod 13 is formed at the tip of the clamp rod 12, and the upper end surface of the flange portion 12a and the guide rod 13
The O-ring 14 is inserted and held between the lower end surface of the holder and the lower end surface of the holder.

A presser plate 15 is fixed to the upper end of the guide rod 13 by passing through it, and a pin 16 is fixed to the upper end of the clamp rod 12 protruding from the upper end opening surface of the guide rod 13 by penetrating in the radial direction. A cam 18 attached to the end is pivotally supported.

The cam 18 has a cam surface 18a with a lower end surface shaped like an arc. When the lever 17 is rotated counterclockwise in the figure until it is parallel to the presser plate 15, the cam 18 slides into contact with the presser plate 15 and rotates. By moving pin 16
And the clamp rod 12 integrated with the pin 16 can be pulled up.

On the other hand, the clamp rod 12 has a fuel passage 19 that opens at one end on the lower end surface, extends along the axial direction inside the clamp rod 12, branches into a T-shape in the diametrical direction at an intermediate position, and communicates with the outer peripheral surface. At the same time, a circumferential groove 20 is formed in the outer peripheral surface portion of the clamp rod 12 where the upstream opening end of the fuel passage 19 is formed.

Further, a fuel inlet 21 is formed in the guide rod 13 through the outer peripheral wall at a position communicating with the circumferential groove 20 at least when the clamp rod 12 is pulled up by operating the lever 17, and a fuel supply pipe is connected to the fuel inlet 21. Connect and fix one end of 22.

Next, the operation of this inspection device will be explained.

When the lever 17 is not clamped while standing upright with respect to the presser plate 15, a gap is formed between the O-ring 14 and the fuel hose 11, so both the clamp rod 12 and the guide rod 13 are inside the fuel hose 11. It can be easily inserted into the fuel hose 11 without damaging the inner surface of the fuel hose 11.

In this state, when the lever 17 is rotated counterclockwise in the figure and brought down parallel to the presser plate 15, the clamp rod 12 is pulled up by a predetermined amount together with the pin 16 as described above. As a result, the O-ring 14 is elastically deformed by the compressive force in the axial direction, and its outer circumferential surface bulges in the diametrical direction, thereby expanding the inner circumferential surface of the fuel hose 11 while coming into close contact with it to fix the inspection device. .

In this state, fuel is supplied under pressure from the fuel supply pipe 22 to the fuel injection valve via the fuel inlet 21, the fuel passage 19, and the fuel hose 11 below the O-ring 14, thereby controlling the fuel injection state of the fuel injection valve and the injection. Inspect the state of fuel leakage from the valve part. After the inspection is completed, the clamp rod 12 is moved downward by returning the lever 17 of the inspection device to its original upright position.
By removing the external force applied to the O-ring 14, the fixation to the inner peripheral surface of the fuel hose 11 is released, and the inspection device can be easily removed from the fuel hose 11.

As described above, according to the above structure, the inspection device can be easily attached to and detached from the fuel hose 11 by simply operating the lever 17, thereby improving work efficiency.
In addition, since the O-ring 14 is used to bring the inner wall of the fuel hose 11 into rubber contact with each other, frictional resistance is large, and the inspection device can be prevented from coming off due to fuel pressure, and damage to the inner surface of the fuel hose 11 can also be prevented. .

Furthermore, if several inspection devices having such a configuration are arranged in parallel and the levers 17 connected to each guide rod 13 are fixed together so that they operate simultaneously, it is possible to inspect a plurality of fuel injection valves at once. .

<Effect of the invention> As explained above, according to the invention, the elastic ring interposed between the clamp rod and the guide rod is compressed and elastically deformed using the clamp operation mechanism, so that it can be fitted into and removed from the fuel hose. I decided to do this, so
The inspection device can be easily attached and detached, improving work efficiency, and since the fuel hose is made of an elastic material and the elastic bodies are in contact with each other, frictional resistance is large, so the inspection device does not come off during inspection due to fuel pressure. Moreover, since it is crimped only when clamping, it is possible to prevent damage to the inner wall of the fuel hose.

Furthermore, by arranging a plurality of the same devices and arranging them to operate simultaneously, it is possible to inspect a plurality of fuel injection valves at once.

[Brief explanation of the drawing]

Figure 1 is a diagram of a conventional inspection device for fuel injection valves for internal combustion engines, Figure 2 is a diagram showing the state of fuel leakage from the injection valve part of the fuel injection valve using the same inspection device, and Figure 3
The figure is a sectional view showing an embodiment of the present invention, FIG. 4 is an enlarged sectional view of section A in FIG. 3, and FIG. It is a diagram. 11...Fuel hose, 12...Clamp rod, 1
2a...Flange part, 13...Guide rod, 14...
...O-ring, 15...Press plate, 16...Pin, 1
7... Lever, 18... Cam, 19... Fuel passage, 20... Circumferential groove, 21... Fuel inlet, 22...
fuel supply pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] A cylindrical guide rod that can be freely inserted into a fuel hose made of an elastic material connected to a fuel inlet of a fuel injector for an internal combustion engine with a gap, and a shaft inside the guide rod. a clamp rod that is fitted and inserted so as to be freely movable in a direction; and a flange portion that is formed at the tip of the clamp rod that protrudes from the opening surface of the tip of the guide rod that faces inside the fuel hose, and that is fitted between the tip surface of the guide rod. The inserted elastic ring whose cross-sectional shape can be freely expanded and contracted and the clamp rod are pulled and fixed to the guide rod in the direction of pulling out from the fuel hose, and the elastic ring is expanded by compressing the elastic ring in the axial direction. a clamp operation mechanism that brings a radially outer circumferential surface into close contact with an inner circumferential surface of the fuel hose; and a fuel passage that guides fuel into the fuel hose from a tip end closer to the fuel injection valve than the elastic ring through the inside of the clamp rod in at least the clamped state. 1. An inspection device for a fuel injection valve for an internal combustion engine, characterized in that the inspection device includes the following.