JPH11223288A - Structure of fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regularly keep a collet in a prescribed position in an engagingly locked state even when a vibration or impact is received in use by providing a sawtooth-shaped edge on an inside inclined surface and/or an outside inclined surface. SOLUTION: A sawtooth-shaped edge is formed on one or the both of inclined surfaces 12, 22, so that a collet 20 can be advanced on the insert port side of a pipe body 30 contracted in diameter to make the biting of the collet 20 perfect. The collet 20 is formed in such a manner that it can be advanced on the insert port side of the pipe body 30 but can not be returned to the deep side, the major diameter side of the inside inclined surface 12 is formed into the sawtooth-shaped edge, and the minor diameter side of the outside inclined surface 22 on the collet 20 side is formed into the sawtooth-shaped edge. According to this, the connection with the pipe body can be prevented from being loosened by the reduction in pressure of a fluid carried in a joint, and the leakage of the fluid can be prevented at a low cost without increasing the number of part items.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a pipe joint, and more particularly, to an improvement of a one-touch operation type pipe joint in which connection between a pipe joint body and a pipe body is always ensured.

[0002]

2. Description of the Related Art In recent years, a pipe joint in which a pipe joint body and a pipe body are connected by one-touch operation has been required, and Japanese Patent Publication No. 6-33844 has been proposed as an example. This is a cylindrical core member inside the pipe joint body, a collet that suppresses the outer surface of the pipe body,
An inclined surface is formed on the body side of the pipe joint with respect to the outer peripheral surface of the collet. When the pipe is inserted into the cylindrical core member, the collet has no resistance, but the direction in which the pipe is pulled out. When a force is applied, the outer surface of the collet comes into contact with the inclined surface, and the collet is engaged by the nail of the collet biting into the outer surface of the tube.

[0003] In the pipe joint of this structure, the collet and the inclined surface have a higher degree of contact if the pulling force of the pipe is stronger, and the force is the force that the claws of the collet bite into the outer surface of the pipe. To be more strongly bonded. When the tube is pulled out, the collet is pushed inward by an arbitrary means to release the nail of the collet from being inserted into the outer surface of the tube, and then the tube is pulled out.

In such a pipe joint, when the pipe joint is mounted on a machine or the like and used, extremely careless handling on the worker side or vibration or shock more than expected is applied. In this case, it may be assumed that the contact between the collet and the inclined surface is released. If the release of the contact between the two suddenly occurs during use, the fluid passing through the inside of the pipe joint may leak out. Therefore, it is necessary to have a structure in which the contact between the two is not released during use.

[0005] Japanese Utility Model Publication No. 5-69483 is a technique very similar to the above-mentioned Japanese Patent Publication No. Hei 6-33844, which has a complicated mechanism and requires the use of an elastic taper cylinder. Inevitably, cost increases, such as an increase in parts.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the contact between the inclined surface of the pipe joint body and the outer surface of the collet is perfect, and the collet is always kept in a predetermined position even when there is vibration or impact during use. The purpose of the present invention is to obtain a structure of a pipe joint that maintains a locked state.

[0007]

The present invention has the following configuration to solve the above-mentioned problems. That is, the outer peripheral inclined surface which has a claw portion which can be reduced in diameter in the pipe insertion hole of the pipe joint body and which bites into the surface of the inserted tube, and further gradually decreases in diameter toward the entrance of the pipe insertion hole. A pipe joint having a built-in collet having an inner peripheral inclined surface extending from the pipe joint body opposite to the outer peripheral inclined surface of the collet, wherein the inner peripheral inclined surface and / or the outer peripheral inclined surface has a saw blade shape. It is a structure of a pipe joint characterized by having an edge.

[0008] Usually, a tubular core member is provided in the pipe insertion hole of the pipe joint body toward the entrance and is provided for insertion of the tubular body, but the tubular core member is provided at the tip of the tubular body. In this state, it may be inserted into the tube insertion hole. Further, even if the saw blade shape is not provided on both the inclined surfaces, for example, a protrusion may be formed on one of the inner peripheral inclined surface and / or the outer peripheral inclined surface to be fitted to the saw blade-shaped edge.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described with reference to a preferred embodiment of a pipe joint. First, the overall structure of the pipe joint will be described. First, a tubular core member arranged in a pipe insertion hole will be described. When the tube is inserted and a force is applied by the pressure of the fluid or in the direction in which the tube is pulled out, the collet in contact with the outer surface of the tube moves together with the tube and the core member, whereby the outer peripheral inclined surface of the collet and the tube The inner peripheral inclined surface of the joint body side abuts, and the diameter of the collet is reduced, and the claws bite into the surface of the tubular body to prevent the tubular body from coming off.

FIG. 1 shows a general example of this pipe joint, in which a tubular core member 11 is provided inside a pipe joint body 10, and a collet 20 is disposed so as to cover the core member. The collet 20 has a diameter-reducible structure.
A slit (not shown) is formed along the line 1 on the deep side of the tube insertion hole. An uneven claw 21 is provided on the inner peripheral surface of the collet 20 and cuts into the surface of the inserted tube 30. On the other hand, the outer peripheral surface of the collet 20 is an outer peripheral inclined surface 22 having a small diameter in the direction of the insertion opening of the pipe, and the inner peripheral inclined surface 12 extending from the pipe joint body 10 is provided opposite thereto.

The tube 30 is inserted while being fitted to the core member 11, and FIG. 2 is a diagram in which the tube 30 is completely fitted to the core member 11 and reaches the deepest portion (a step portion) of the insertion hole. It is. If a high-pressure fluid is passed through the pipe joint in this state, or if the pipe 30 is to be pulled out toward the insertion port, the pipe 3
The 0 and the core member 11 move together, and the collet 20 also moves together with the insertion port. Then, the outer peripheral inclined surface 22 of the collet 20 and the inner peripheral inclined surface 12 on the side of the pipe joint body 10 come into contact with each other, and the diameter of the collet 20 is reduced, whereby the uneven claws 21 bite into the outer surface of the tubular body 30. This is to prevent the tube 30 from coming off.

However, the pipe joint is often used for a hydraulic part of a vehicle, or is installed around a pump or an engine, so that the pipe joint is always subjected to vibration. As a result, the pipe 30 may be moved to the deep side, whereby the connection of the tube 30 may be loosened and the fluid may leak.

In the present invention, the purpose is to prevent the tube 30 from coming off, and a saw blade-shaped edge is formed on one or both of the two inclined surfaces 12 and 22.
As a result, the collet 20 is reduced in diameter, that is, can be advanced only to the insertion opening side of the tube 30, whereby the collet 20 is completely bite, and the looseness of the connection of the tube 30 is eliminated. Things.

The collet 20 can be advanced only to the insertion port side of the tube 30 and does not return to the deep side. The inner peripheral inclined surface 12 has a saw blade edge on the large diameter side (deep side).
On the other hand, the outer peripheral inclined surface 22 on the collet 20 side may be formed with a saw blade-shaped edge on the small diameter side (entrance side).

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pipe joint according to the present invention. FIG. 3 is a half sectional view showing a pipe joint of the present invention, in which a sleeve 13 is provided at a pipe insertion opening of a pipe joint body 10 and an inner peripheral inclined surface 12 is formed in the sleeve 13. The inner peripheral inclined surface 12 has a saw blade-shaped edge 14 formed on the large diameter side, that is, on the deep side. In addition, sleeve 1
3 may be a crimped and fixed to the pipe joint body 10.

On the other hand, the outer peripheral inclined surface 22 of the collet 20 has a saw blade-shaped edge 23 formed at the same pitch as the edge 14 on the small diameter side, that is, on the insertion side of the tube 30. still,
Other reference numerals are the same as those described in the above-mentioned drawings, and are omitted here.

In the structure of the pipe joint of the present invention, when the outer peripheral inclined surface 22 of the collet 20 and the inner peripheral inclined surface 12 of the sleeve 13 are brought into contact with each other, as shown in FIG. Of the collet 20 cannot be moved to the deep side, and the looseness of the connection of the tubular body 30 and the like can be prevented. When the outer peripheral inclined surface 22 and the inner peripheral inclined surface 12 on the sleeve 13 side are pressed against each other, the engagement portion of the edge portions 23 and 14 becomes deeper, and the degree of diameter reduction of the collet 20 increases accordingly. The detachment of all the tubes 30 is further prevented. still,
Although not shown, the pipe joint body 10 may be directly extended instead of the sleeve 13 to form the inner peripheral inclined surface 12, as a matter of course.

FIG. 5 shows the outer peripheral inclined surface 22 of the collet 20 formed with a peripheral projection 24 which fits into the saw blade-shaped edge 14 formed on the inner peripheral inclined surface 12 of the sleeve 13. The combination is effective in preventing the tube 30 from coming off. Of course, the peripheral protrusion may be formed on the inner peripheral inclined surface 12 and may be engaged with the edge 23 on the collet 20 side.

[0019]

According to the present invention, it is possible to prevent the connection with the pipe from being loosened due to a decrease in the pressure of the fluid flowing in the joint, and to prevent the leakage of the fluid at a low cost without increasing the number of parts. And its industrial value is great.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a basic structure of a pipe joint.

FIG. 2 is a half cut-away view when a pipe is inserted into an insertion hole of a pipe joint main body.

FIG. 3 is a half sectional view showing the structure of the pipe joint of the present invention.

FIG. 4 is a half sectional view showing an engagement state between a pipe body and a pipe joint main body in the pipe joint of FIG. 3;

FIG. 5 is a half sectional view showing another structure of the pipe joint of the present invention.

[Explanation of symbols]

 10 ‥‥ fitting body, 11 ‥‥ tubular core member, 12 ‥‥ inner inclined surface on the fitting body side, 13 ‥‥ sleeve, 14 ‥‥ edge, 20 ‥‥ collet, 21 ‥‥ collet Claw, 22 ‥‥ collet outer peripheral inclined surface, 23 ‥‥ edge, 24 ‥‥ circumferential projection, 30 ‥‥ tube.

Claims (4)

[Claims] 1. A pipe joint body having a claw portion capable of being reduced in diameter and inserted into a surface of a pipe inserted into a pipe insertion hole of a pipe joint body, and further having a diameter gradually reduced toward an entrance of the pipe insertion hole. A pipe joint having a built-in collet having an outer peripheral inclined surface, and having an inner peripheral inclined surface extending from a pipe joint body in opposition to the outer peripheral inclined surface of the collet, wherein the inner peripheral inclined surface and / or the outer peripheral inclined surface are provided. A pipe joint structure having a saw blade-shaped edge. 2. The structure of the pipe joint according to claim 1, wherein a tubular core member is provided in the pipe insertion hole of the pipe joint body toward the inlet. 3. A projection formed on one of the inner peripheral inclined surface and / or the outer peripheral inclined surface to be fitted to the saw-shaped edge.
Structure of the pipe joint described in the paragraph. 4. The pipe joint structure according to claim 1, wherein the collet is a saw-shaped edge which can be advanced only to the pipe joint insertion port side.