JP2003090435A - Adjustable joint and method for installing o-ring therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely seal an adjustable joint with a low cost means. SOLUTION: A recessed O-ring groove 3 forming an O-ring inserting part of the adjustable joint is separated into a joint 2 including one projecting ring part 4 and a press-fitting part 5 including another projection ring part 6. The press-fitting part 5 is press-fitted in the joint 2 after installing an O-ring 7 in the joint side 2 to retain the O-ring 7. Consequently, a sure fluid seal is provided by a low cost means and sealing quality is improved by prevention of leak at a seal part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint for connecting two separate parts using an O-ring in a pipe joint for conveying a fluid, and an O-ring mounting method for the joint.

[0002]

2. Description of the Related Art A conventional universal joint by this type of die casting is, as shown in FIG. 5, an O-ring groove 3 having a concave portion sandwiched between two convex ring portions 4 and 6 at the tip of an annular outer shape portion.
Is integrally formed as shown in FIG. 6, and is formed by a mold having a parting line 15 that passes through the center of the annular shape and is divided into left and right parts.

The bottom surface of the recess of the O-ring groove 3 is
Since the parting line 15 of the mold is located in the longitudinal direction of the shaft, the burr remains. Therefore, after the molding process, the O-ring groove 3 in the recess is deburred by the post-processing cutting.

[0004]

However, in the above-mentioned conventional universal joint, it is necessary to secure the sealing surface of the O-ring 7 by deburring again after the O-ring groove 3 of the O-ring insertion portion is molded and processed. There was a problem called. Also,
To mount the O-ring 7 in the O-ring groove 3 of the recess,
The inner diameter of the O-ring 7 must be inserted over the outer diameter of the outer convex ring portion 6 that constitutes the O-ring mounting portion, and care must be taken not to damage the O-ring 7 during insertion. There was also the problem of having to work.

[0005]

According to the present invention, in order to solve the above-mentioned problems, the O-ring groove of the concave portion corresponding to the O-ring insertion portion of the universal joint has two convex ring portions.
It is configured by dividing it into one part and combining the two parts.

According to the above-mentioned invention, since the portion forming the sealing surface on the inner diameter side of the O-ring 7 when the O-ring is mounted is a simple cylindrical shape, for example, in a die casting mold, the inner diameter portion for conveying the fluid is used. Similarly, since the molding can be performed by the punching configuration in the longitudinal direction, the parting line 15 of the mold can be eliminated in the portion which becomes the sealing surface of the O-ring 7.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A universal joint according to claim 1 of the present invention is provided with an O-ring groove corresponding to a concave portion which serves as an O-ring mounting portion.
It is configured by press-fitting two component parts each having one convex ring portion to integrally configure. And O
When the ring is mounted, the side that becomes the sealing surface at the inner diameter can be molded by the punching surface during die casting, so there is no burr that was conventionally formed as a parting line at the sealing surface. Therefore, post-processing after molding can be eliminated.

In the universal joint according to claim 2 of the present invention, one of the two parts of claim 1 which is a press-fitted part is a metal draw-molded product, and a large number of meshes are formed on the bottom surface thereof. Have pores. The large number of mesh-shaped pores 13 can act as a filter for the fluid carried in the joint and the inner diameter of the joint body.

A third aspect of the present invention relates to a method for manufacturing the universal joint according to the first and second aspects. Since the recessed portion of the O-ring mounting portion of the universal joint portion is composed of two independent parts, unlike the conventional O-ring mounting manufacturing method, first, the O-ring is the recessed portion of one of the O-ring mounting portions. After the insertion to the side, by inserting a press-fitting part corresponding to the convex ring part on the outside of the O-ring mounting part, a new manufacturing process is performed so that the O-ring fits into the part corresponding to the O-ring groove of the predetermined recess for the first time. The O-ring can be attached by the method.

[0010]

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

(First Embodiment) FIG. 1 is a sectional view showing a universal joint portion according to a first embodiment of the present invention.

Next, the operation and action will be described. One convex ring portion 4 forming an O-ring groove 3 is formed in the outer shape at one end of the joint 2 in which the inner diameter portion 1 is used as a passage for conveying a fluid such as gas. Has been done. A press-fitting component 5 is press-fitted into the inner diameter portion 1 of the joint 2 at the end portion thereof, and a part of the outer shape thereof constitutes another convex ring portion 6 constituting the O-ring groove 3. . Therefore, the O-ring groove 3 is formed by the convex ring portions 4 and 6, and the O-ring 7 for sealing is attached to the O-ring groove 3.
The joint 2 fitted with the O-ring 7 is inserted into the fitting recess 10 of the joint body 9 having the second inner diameter portion 8 to be connected, and then fixed by the fixing screw 12 via the fixing metal fitting 11. It Therefore, the inner diameter portion 1 and the inner diameter portion 8 of the joint 2 and the joint body 9 are automatically communicated with each other, and the connection portion is completely sealed via the O-ring 7. Further, the fixing metal fitting 11 prevents the joint portion from coming off.

(Embodiment 2) FIG. 2 is a sectional view showing a universal joint of embodiment 2 corresponding to claim 2 of the present invention.
[Fig. 3] is a front view of a press-fitting component 5A that constitutes the joint.

The second embodiment differs from the first embodiment in that, as shown in FIG. 3, a large number of mesh-shaped pores 13 are formed on the bottom surface of the press-fitting part 5A.

The same reference numerals as those of the first embodiment have the same structure, and the description thereof will be omitted.

The operation and action of the press-fitting component 5 will be described below.
The large number of pores 13 processed into A prevent the dust mixed in the fluid conveyed through the joint 2, the inner diameter portion 2 of the joint body 9 and the second inner diameter portion 9 from flowing into the other inner diameter portion. Acts as a filter for.

(Embodiment 3) FIGS. 4A, 4B and 4C.
FIG. 6 is a cross-sectional view showing a procedure of a method for manufacturing a universal joint according to claim 1 or 2 of the present invention. The manufacturing method of the present invention is different from the manufacturing method of the conventional embodiment shown in FIG.
As shown in (a), the joint 2, the O-ring 7, and the press-fitting part 5
Alternatively, 5A is set on the same processing center line 14. Then, as shown in FIG. 4B, the O-ring 7 is first inserted to a predetermined position of the joint 2. The inner diameter of the O-ring 7 and the outer diameter of the joint 2 have a dimensional relationship that ensures a seal by the O-ring, and the inner diameter of the O-ring is temporarily enlarged to the outer shape of the convex ring portion as in the conventional case. No need to insert. After setting the O-ring 7 at a predetermined position of the joint 2, the press-fitting component 5 or 5A is press-fitted into the inner diameter portion 1 of the joint 2 as shown in FIG. When press-fitting is finished,
The O-ring 7 is manufactured in a state where it is securely mounted in the O-ring groove 3 as in the conventional case, and thereafter, as in the conventional case, it is inserted in the joint body 9 as shown in FIG. Complete.

The same reference numerals as those in the first embodiment have the same structure, and the description thereof will be omitted.

The operation and action will be described below. In the sealing method using an O-ring, the manufacturing method is one in which measures for preventing scratches on the O-ring at the time of processing and manufacturing are taken, which are the most important in terms of quality.

[0020]

As described above, the universal joint according to the first aspect of the present invention can eliminate the post-processing of the sealing surface by the O-ring and has an effect of reducing the processing cost.

Further, the universal joint according to the second aspect also has an effect that the component corresponding to the filter can be provided in the internal passage for conveying the fluid by a cheap and easy method.

Further, the universal joint according to claim 1 or 2 relating to the method of mounting the O-ring according to claim 3 has an effect of preventing fluid leakage from the seal portion due to scratches on the O-ring portion in the manufacturing process.

[Brief description of drawings]

FIG. 1 is a sectional view of a universal joint according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a universal joint according to a second embodiment of the present invention.

FIG. 3 is a front view of a press-fitting component forming the universal joint.

FIG. 4A is an exploded view showing a state before mounting an O-ring in the third embodiment of the present invention. FIG. 4B is an exploded view showing a half state after mounting the O-ring. Side sectional view showing the state

FIG. 5 is a sectional view showing a state in which a conventional universal joint is formed.

FIG. 6 is a front and side view of a conventional joint.

[Explanation of symbols]

1 Inner diameter 2 joints 3 O-ring groove 4 Convex ring part 5 Press-fit parts 6 Convex ring part 7 O-ring 8 Inner diameter 9 joint body 10 Fitting recess 13 pores

Continued front page    F-term (reference) 3H016 AD15 AE00                 3H104 JA04 JB02 JC10 JD09 KB03                       KB08 KB10 LF03 MA10                 3J040 AA01 AA13 AA15 AA17 BA02                       FA05 HA03 HA05 HA30

Claims (3)

[Claims] 1. A universal joint in which a recess formed by being sandwiched between two convex ring portions is formed in an annular outer shape portion of the joint as an O-ring insertion portion, wherein the convex ring portion on the tip side of the joint is A universal joint in which the press-fitted component is press-fitted into the inner diameter of the tip of the joint having another convex ring portion that forms the recessed portion of the O-ring insertion portion after being molded as an independent press-fitted separate component. 2. The universal joint according to claim 1, wherein the press-fitting part is a metal draw-molded product, and a large number of pores are provided in a mesh shape on the bottom surface thereof. 3. When inserting the O-ring into the recess of the O-ring insertion part, the O of the joint forming the recess of the O-ring insertion part is inserted.
The method for mounting an O-ring on a universal joint according to claim 1 or 2, which is carried out by a procedure of press-fitting a press-fitting component having an outer convex ring portion after inserting the O-ring into the ring groove.