JPH0547912Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a pipe joint, particularly a pipe joint using a thrust ball bearing.

Conventional technology As a conventional pipe joint, for example,
As disclosed in Publication No. 75188, a tubular joint member is provided with a flange on the outer surface of one end, a thrust ball bearing is fitted into the joint member, and a hole is drilled in the top wall to allow the joint member to pass through. Insert the fitting member into the hole of the fitted thrust ball bearing,
Consisting of a cap nut that is held between the brim and the top wall, the thrust ball bearing rotatably connects a pair of races spaced apart, a plurality of balls rolling between both races, and both races. The connecting ring is formed at a cylindrical portion spanning the outer peripheral surfaces of both races so as to cover the gap between both races from the outside, and at both ends of the cylindrical portion. It is known to consist of a pair of inward flanges respectively engaged with the outer surfaces of both races.

Problems to be Solved by the Invention In the pipe joint described above, the cylindrical portion of the connecting ring covers the gap between both races from the outside, and the gap is exposed on the inner surface of the bearing. Therefore, when fitting the bearing into the joint member, there is a problem that the gap exposed on the inner surface gets caught on the end of the joint member, making it difficult to assemble the pipe joint smoothly.

Additionally, there is a gap between the outer circumferential surface of the joint member and the inner circumferential surface of the hole in the top wall of the nut, and foreign matter such as dirt and rainwater can enter the bearing through this gap, and the foreign matter can enter the gap between both races. They may invade the inside of the bearing from the inside, which may prevent the bearing from rotating smoothly.

The purpose of this invention is to provide a pipe joint that eliminates the above-mentioned problems.

Means for Solving the Problems The pipe joint according to this invention includes an annular joint member with a flange on the outer surface of one end, a thrust ball bearing fitted into the joint member, and a hole drilled in the top wall through which the joint member is inserted. , a thrust ball bearing fitted in a joint member is inserted into a hole, and a cap nut is sandwiched between a collar and a top wall, and the thrust ball bearing is connected to a pair of races spaced apart. ,
In a pipe joint that includes multiple balls that roll between both races and a connecting ring that rotatably connects both races, chamfering is applied to the corners where the outer and inner surfaces of both races intersect. A cylindrical part is formed at each end of the cylindrical part, and a connecting ring is formed at both ends of the cylindrical part and connects the two races. It is characterized by a pair of outwardly tapered retaining portions that are brought into contact with the chamfered portions, respectively.

Function In the pipe joint according to this invention, chamfered portions are formed at the angles where the outer surfaces and inner peripheral surfaces of both races intersect, and the connecting ring covers the gap between both races from the inside. The bearing consists of a cylindrical part that spans the inner peripheral surface, and a pair of outwardly tapered retaining parts formed at both ends of the cylindrical part and abutting the chamfered parts of both races. When fitting the bearing into the joint member, the gap between both races of the bearing does not get caught on the end of the joint member, and the retaining part of the connecting ring acts as a guide. Even if foreign matter tries to enter the bearing from inside the gap between both races, the cylindrical portion of the connecting ring prevents this.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

Referring to FIG. 1, the pipe joint includes a first tubular joint member 12 having a male thread 11 on the outer surface of one end;
A second annular joint member 14 having a flange 13 on the outer surface of one end, a first annular gasket 15 interposed between the end faces of both joint members 12 and 14, and a thrust fitted to the second joint member 14. ball bearing 16
Then, a hole 18 through which the second joint member 14 is inserted is made in the top wall 17, and the male screw 11 is screwed into the hole 18.
It consists of a cap nut 19 which holds the thrust ball bearing 16 between the collar 13 and the top wall 17.

The other end of the first joint member 12 is formed with a male thread 21 into which a pipe (not shown) to be connected is screwed. The other end of the second joint member is formed with a sleeve 21 into which the end of the other pipe P to be connected is fitted.

Gasket holding annular protrusions 23 and 24 having a semicircular cross section are provided on opposing end surfaces of both the joint members 12 and 14.
are formed respectively. Gasket 15 is
Made of nickel or austenitic stainless steel, silver plated if required. Further, as the material of the gasket 15, copper, aluminum alloy, or the like is appropriately employed.

As shown in detail in FIG.
is a pair of laces 31 spaced apart,
32, a ball 33 that rolls between both races 31 and 32, and a connecting ring 34 that rotatably connects both races 31 and 32. Each race 31, 32, ball 33 and connecting ring 34 are all made of stainless steel.

Ball rolling grooves 35 and 36 each having a semicircular cross section are formed on opposing surfaces of both races 31 and 32. Tapered chamfered portions 37 and 38 are formed at the corners where the outer surfaces and inner peripheral surfaces of both races 31 and 32 intersect.

The connecting ring 34 connects both races 31 and 32 so as to cover the gap between both races 31 and 32 from the inside.
a cylindrical portion 41 extending over the inner peripheral surface of the cylindrical portion 41; and a pair of outwardly tapered cutouts formed at both ends of the cylindrical portion 41 and abutting the chamfered portions 37 and 38 of both races 31 and 32, respectively. Stop part 42,
43 and more.

Next, the operation of connecting pipes using a pipe joint will be explained. First, the thrust ball bearing 13 and the nut 19 are fitted into the second joint member 12. Next, the second
The end of the pipe P to be connected is fitted into the tube seat 22 of the joint member 12 and welded. And Fukuro Nats 19
After fitting the gasket 15 therein, the first joint member 12 is fixed with a spanner, and the cap nut 19 is rotated with a spanner to screw it into the male thread 11, so that the first coupling member 12 and the cap nut 19 are mutually connected. Tighten. As a result, the joint members 12 and 14 are drawn toward each other, and the annular protrusions 23 and 24 of the joint members 12 and 14 press the gasket 15 from both sides, so that the joint members 12 and 14 are fluid-tightly connected. ing. When the cap nut 19 is rotated, the top wall 17 of the cap nut 19 slides against the collar 13 by the thrust ball bearing 16, so the frictional resistance between the two is reduced and workability is improved. The sealing surface of the gasket 15 will not be damaged.

When fitting the thrust ball bearing 16 into the second joint member 14, the gap between both races 31 and 32 is hidden by the connection ring 34, so the end of the second joint member 14 does not get caught in the gap and the connection ring You will be guided along 21.

Furthermore, when using a pipe joint, foreign matter such as dirt or rainwater may enter the bearing through the gap between the outer surface of the second joint member 14 and the inner peripheral surface of the hole 18 in the top wall 17 of the cap nut. . Even if a foreign object tries to enter the bearing 16 from inside the gap between the races 31 and 32, the gap is blocked by the connecting ring 34.
This is not possible because the cylindrical portion 41 covers the cylindrical portion 41. In addition, since the outer surface of one race 31 is brought into close contact with the collar 13 and the outer surface of the other race 32 is brought into close contact with the top wall 17 of the cap nut, any foreign matter that has entered will not be able to pass through the outside of the bearing 16. Therefore, there is no possibility of intrusion into the bearing 16 from outside the gap between the races 31 and 32.

FIG. 3 shows a modification of the first joint member. In this modification, parts corresponding to those shown in FIG. 1 are given the same reference numerals as in FIG. 1, and their explanations will be omitted.

A collar 52 is provided on the outer surface of one end of the first joint member 51 . Further, the other end of the first joint member 51 is provided with a tube seat 53 in the same manner as the second joint member 14 . A hollow bolt 54 is fitted into the first joint member 51 so that its tip abuts against the collar 52. Hollow bolt 54 and cap nut 19
By being screwed together, both joint members 51,
14 are drawn together and connected fluid-tightly.

Effects of the invention According to this invention, when fitting the bearing into a joint member, the gap between both races of the bearing does not get caught on the end of the joint member, and the retaining portion of the connecting ring acts as a guide. This makes it possible to assemble the pipe joint smoothly, and what's more, even if a foreign object that has entered the bearing tries to enter the bearing from inside the gap between both races, it can be removed by the cylindrical part of the connecting ring. This prevents foreign objects from interfering with the smooth rotation of the bearing.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with Fig. 1 being an overall vertical sectional view, Fig. 2 being an enlarged longitudinal sectional view showing details of the main parts of the thrust ball bearing, and Fig. 3 showing a modification of the joint member. 2 is a longitudinal sectional view corresponding to FIG. 1. FIG. 12, 14...Joint member, 13...Brim, 16
... Bearing, 17 ... Nut top wall, 18 ... Hole, 1
9... Fukuro Natsutto, 31, 32... Lace, 33...
... Ball, 34 ... Connection ring, 42 ... Cylindrical portion, 37, 38 ... Chamfered portion, 42, 43 ... Removal prevention portion.

Claims (1)

[Claims for Utility Model Registration] A tubular joint member 14 having a collar 13 on the outer surface of one end, a thrust ball bearing 16 fitted into the joint member 14, and a hole 18 formed in the top wall 17 through which the joint member 14 is inserted. , the thrust ball bearing 16 fitted in the joint member 14 is inserted into the hole 18, and the cap nut 19 is held between the collar 13 and the top wall 17, so that the thrust ball bearing 16 A pair of laces 31 and 32 arranged
and a plurality of balls 33 that roll between both races 31 and 32, and a connecting ring 34 that rotatably connects both races 31 and 32. Chamfered portions 37 and 38 are formed at the corners where the outer surface and the inner circumferential surface of
a cylindrical portion 41 extending over the inner circumferential surface of the cylindrical portion 41 and both races 3 formed at both ends of the cylindrical portion 41,
A pair of outwardly tapered retaining portions 4 are brought into contact with the chamfered portions 37 and 38 of Nos. 1 and 32, respectively.
A pipe joint characterized by comprising: 2.43.