JP2008121845A - Seal ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal ring capable of precluding galling in an assembling process by returning to an original shape certainly even after an abutment joint is pushed wide to fit the seal ring in a ring-shaped groove formed at either of two relatively moving members. <P>SOLUTION: The seal ring fitted in the ring-shaped groove formed at either of the relatively moving members has an inside circumferential surface facing radially inward, an outside circumferential surface facing radially outward, two axial side faces, and the abutment joint formed circumferentially in one place wherein an annular hole is formed on either of the inside/outside surfaces and the two side faces, and an elastic ring is fitted in the annular hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a seal ring having a joint.
The present invention also relates to a synthetic resin seal ring for preventing leakage of fluids such as oil and water from the joint, air, and other fluids.

Furthermore, the present invention relates to a seal ring made of a synthetic resin material such as PTFE, PEEK, or PPS, which is mainly used for sealing hydraulic oil in an automatic transmission such as a torque converter or a hydraulic clutch.
Here, PTFE material means polytetrafluoroethylene resin.

Conventionally, a seal ring shown in FIG. 6 is known.
This type of seal ring has the following problems.

That is, when the seal ring 200 is mounted in an annular groove provided in one of the relative motion members, the seal ring 200 is expanded using the joint 700.
However, since the seal ring is made of a synthetic resin material, the seal ring does not completely return to the original shape after being mounted in the annular groove, and the vicinity of the joint 700 is deformed outward as indicated by a broken line in FIG.
In this state, if it is inserted into the hole provided on the other side of the relative motion member, the seal ring 200 is gnawed, causing a problem of damage.
Therefore, an attempt was made to braze the seal ring 200 in the inner diameter direction to suppress the vicinity of the joint 700 from being deformed outward (Japanese Utility Model Publication No. 61-64567).
However, even with this brazing, the problem is not completely solved, and there is a problem that a special jig for brazing is required and the number of man-hours increases.

JP-A-8-135797 Japanese Utility Model Publication No. 61-64567

  The present invention makes it possible to surely return to the original shape even after the joint of the seal ring is expanded and attached to the annular groove provided on one of the relative motion members, thereby preventing the seal ring from being galled during assembly. It is to provide a seal ring that can be used.

  In the seal ring of the present invention, an annular seal ring mounted in an annular groove provided in one of the relative motion members includes an inner peripheral surface facing inward in the radial direction, an outer peripheral surface facing outward in the radial direction, and one in the axial direction. In the seal ring having the side surface and the other side surface, and a joint formed in one place in the circumferential direction, an annular hole is provided on one of the inner and outer peripheral surfaces and the both side surfaces, and the annular hole is provided in the annular hole. It was set as the structure which has arrange | positioned the elastic ring.

The present invention has the following effects.
According to the seal ring of the first aspect of the invention, it is possible to provide a seal ring that can surely return the seal ring to its original shape and can prevent the seal ring from being galvanized during assembly.
In addition, since the elastic ring has tension or tightening force, the seal ring is pressed against the mating housing even when the operating pressure does not act on the seal ring, so that leakage from between the seal ring and the mating housing is prevented. It can be minimized.

  Furthermore, according to the seal ring of the invention described in claim 2, it is possible to more reliably prevent the elastic ring (9) from dropping out of the annular hole (8).

Hereinafter, the best mode for carrying out the present invention will be described.
The best mode for carrying out the invention will be described with reference to FIGS.
1 and 2, a seal ring 2 made of a synthetic resin material such as PTFE, PEEK, or PPS is used by being mounted in an annular groove 1 provided on one of the relative motion members, and faces inward in the radial direction. It has an inner peripheral surface 3, an outer peripheral surface 4 facing outward in the radial direction, one side surface 5 and the other side surface 6 in the axial direction, and a joint 7 formed at one place in the circumferential direction.

An annular hole 8 is formed in the outer peripheral surface 4. The annular hole 8 may have any shape as long as the elastic ring 9 does not fall off, and the opening width of the hole is preferably smaller than the diameter of the elastic ring 9, and in this sense, a dovetail shape is particularly preferable.
An elastic ring 9 is mounted in the annular hole 8.
The elastic ring 9 may be any one that acts to reduce or expand the diameter of the seal ring 2 and is appropriately selected from resin, rubber, and metal materials. preferable.

FIG. 3 shows an embodiment in which the annular hole 8 is provided on the inner peripheral surface of the seal ring 2.
This embodiment is suitable for use as a piston seal.
In FIG. 4, the annular hole 8 is provided on both side surfaces 5 and 6 of the seal ring 2, and elastic rings 9 and 9 are respectively disposed.
FIG. 5 is a view showing a state in which the seal ring 2 shown in FIG. 4 is mounted in an annular groove 1 provided in one of the relative motion members.
And the annular hole 8 provided in the both side surfaces 5 and 6 is in a state of being blocked by the side surface 11 of the annular groove 1 even when the peripheral surface of the seal ring 2 is in contact with the other of the relative motion members. ing.
This effectively prevents the sealed fluid existing on the left side in the figure from leaking to the right side in the figure.

  The present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

It is a top view of the seal ring which concerns on this invention. It is AA sectional drawing of FIG. FIG. 8 is a view showing another embodiment of the seal ring according to the present invention in the same cross section as FIG. FIG. 8 is a view showing another embodiment of the seal ring according to the present invention in the same cross section as FIG. FIG. 5 is a view showing a state where the seal ring 2 shown in FIG. 4 is mounted in an annular groove 1 provided on one of the relative motion members. It is a top view of the seal ring which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Annular groove 2 ... Seal ring 3 ... Inner peripheral surface 4 ... Outer peripheral surface 5 ... One side 6 ... Other side 7 ... Joint 8 ... Annular hole 9 ... Elastic ring 11 ... side

Claims (2)

  An annular seal ring (2) mounted in an annular groove (1) provided in one of the relative motion members has an inner peripheral surface (3) facing radially inward and an outer peripheral surface (4) facing radially outward. In the seal ring (2) having one side surface (5) in the axial direction, the other side surface (6), and a joint (7) formed in one place in the circumferential direction, the inner and outer peripheral surfaces (3 ), (4) and the both side surfaces (5), (6) are provided with an annular hole (8), and an elastic ring (9) is disposed in the annular hole (8). Seal ring.   The seal ring according to claim 1, wherein the annular hole has a dovetail shape.

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