JPH0732288U - Pipe closure structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipe closing structure capable of ensuring a sealing property even when the positioning accuracy of a caulking portion is low. [Structure] A cylindrical elastic seal layer 2 is provided between a pipe 3 and a cylindrical obstruction plug 1 fitted in the pipe 3, and an inner circumference is continuously formed over the entire circumference of the pipe 3. The caulking portion 4 bulging to the side was formed, and the elastic seal layer 2 was brought into close contact with the inner circumference of the pipe 3 and the outer circumference of the closure plug 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for closing a pipe used as a pipe in a hydraulic circuit of a vehicle.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 2, when a cylindrical block plug 12 is fitted in a pipe 11 to block an opening of the pipe 11, a ring groove 13 is formed on the outer periphery of the block plug 12. After fitting the O-ring 14 inserted into the ring groove 13 into the pipe 11, the outer periphery of the pipe 11 is swaged by roller swaging or the like, so that the O-ring 14 is attached to the pipe 11. It is sandwiched between the inner circumference and the outer circumference of the closure plug 12.

[0003]

[Problems to be solved by the device]

 In the conventional pipe closing structure described above, if the position of the closing plug 12 (correctly, the position of the O-ring 14) and the position of the caulking portion 15 are deviated, the caulking portion 15 May not contact the O-ring 14. In such a case, the sealing property between the inner circumference of the pipe 11 and the outer circumference of the blocking plug 12 cannot be sufficiently secured, and the fluid in the pipe 11 may leak to the outside.

Therefore, it is necessary to accurately position and form the caulking portion 15 with respect to the O-ring 14 of the closing plug 12, which requires a lot of man-hours for closing the pipe 11.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a pipe closing structure capable of ensuring a sealing property without increasing the positioning accuracy of a caulking portion as compared with the prior art. Especially.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a tubular elastic seal layer between a pipe and a cylindrical obstruction plug fitted in the pipe, and at the same time, covers the entire circumference of the pipe. A caulking portion that continuously bulges toward the inner peripheral side is formed, and the elastic seal layer is brought into close contact with the inner peripheral of the pipe and the outer peripheral of the blocking plug.

[0007]

[Action]

 According to the above configuration, first, the cylindrical obstruction plug is fitted in the pipe, and the cylindrical elastic seal layer is disposed between the pipe and the obstruction plug. Then, a caulking portion that continuously bulges toward the inner peripheral side is formed over the entire circumference of the pipe, and the elastic seal layer is brought into close contact with the inner peripheral of the pipe and the outer peripheral of the closure plug. This elastic sealing layer seals between the inner circumference of the pipe and the outer circumference of the plug.

Further, the tubular elastic seal layer ensures the above-mentioned sealing property while lowering the positioning accuracy of the caulking portion as compared with the case where the O-ring is used.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A is a vertical sectional view showing a closed structure of a pipe, and FIG. 1B is a lateral sectional view taken along the line AA of FIG.

In these drawings, reference numeral 1 denotes a columnar closing plug, and an outer peripheral surface of the closing plug 1 is formed with an annular groove 1 a having an arc-shaped cross section.

An elastic seal layer 2 is formed over the entire length and the entire circumference of the closure plug 1 including the annular groove 1 a. The elastic seal layer 2 may be formed by coating an elastic rubber or by inserting an elastic rubber ring body.

Reference numeral 3 denotes a pipe having the opening 1 fitted into the closing plug 1. The pipe 3 continuously bulges toward the inner peripheral side over the entire circumference of the pipe 3 and engages with the annular groove 1 a of the closing plug 1. A crimping portion 4 is formed to be fitted.

The elastic seal layer 2 is brought into close contact with the inner circumference of the pipe 3 and the outer circumference of the plug 1 by the caulking portion 4.

In the above-mentioned configuration, first, the column-shaped closing plug 1 is fitted in the pipe 3, and the tubular elastic seal layer 2 is arranged between the pipe 3 and the closing plug 1. Then, a caulking portion 4 that continuously bulges toward the inner peripheral side over the entire circumference of the pipe 3 is formed by roller caulking or the like, and the elastic seal layer 2 is formed on the inner peripheral surface of the pipe 3 and the closing plug. The inner circumference of the pipe 3 and the outer circumference of the plug 1 are sealed by closely contacting the outer circumference of the plug 1.

The tubular elastic seal layer 2 ensures the above-mentioned sealing property while lowering the positioning accuracy of the caulking portion 4 as compared with the conventional case using an O-ring.

Further, the caulking portion 4 is engaged with the annular groove 1 a of the block plug 1 to hold the block plug 1 in the opening of the pipe 3 even when fluid pressure acts on the pipe 3.

In this embodiment, the elastic seal layer 2 is provided only on the outer circumference of the closure plug 1, but only on the inner circumference of the pipe 3 or on both the outer circumference of the closure plug 1 and the inner circumference of the pipe 3. It may be provided.

In addition, when the caulking portion 4 of the pipe 3 is engaged with the annular groove 1a of the closing plug 1 to hold the closing plug 1 in the opening of the pipe 3, when the fluid pressure does not act in the pipe 3. Need not form the annular groove 1a on the outer circumference of the plug 1.

[0020]

[Effect of device]

 As described above, according to the present invention, the tubular elastic seal layer is provided between the pipe and the cylindrical obstruction plug fitted in the pipe, and the inner circumference is continuously provided over the entire circumference of the pipe. By forming a caulking portion that bulges to the peripheral side and bringing the elastic seal layer into close contact with the inner circumference of the pipe and the outer circumference of the block plug, the gap between the inner circumference of the pipe and the outer circumference of the block plug is secured. It can be really sealed.

In addition, as compared with the conventional pipe closing structure in which a ring groove is formed on the outer periphery of the closing plug by using the tubular elastic seal layer and an O-ring is assembled, the positioning accuracy of the caulking portion is improved. Although it is lowered, the sealing property can be ensured, and thus the efficiency of the pipe closing operation can be improved as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a pipe closing structure according to an embodiment of the present invention. (2) is a cross-sectional view taken along the line AA of (1).

FIG. 2 (1) is a vertical cross-sectional view showing a conventional pipe closing structure. (2) is a cross-sectional view taken along the line AA of (1).

[Explanation of symbols]

 1 Blocking plug 2 Elastic seal layer 3 Pipe 4 Crimping part

Claims (1)

[Scope of utility model registration request] 1. A tubular elastic seal layer is provided between a pipe and a cylindrical obstruction plug fitted in the pipe, and the pipe is continuously provided on the inner circumferential side over the entire circumference of the pipe. A pipe closing structure, characterized in that a swaging portion that bulges is formed to bring the elastic seal layer into close contact with the inner circumference of the pipe and the outer circumference of the closing plug.