JPH0814396A - Seal ring - Google Patents

Abstract

PURPOSE:To prevent the sliding surface of a seal ring from being burned by interposing oil in the sliding portion of the side face of the seal ring to the extent that a sealing property is not affected and to enhance the durability of the seal ring by reducing the wear of the sliding surface of the seal ring. CONSTITUTION:A first oil groove 3 open to the inner periphery of a seal ring 1, a second oil groove 5 located in a circumferentially different position from the first oil groove 3 and open to the outer periphery of the seal ring, and a bypass oil groove 6 which communicates the end of the first oil groove 3 with the end of the second oil groove 5, are formed on the side 2 of the seal ring 1 which serves as a sliding surface. Hydraulic oil is introduced into the oil grooves 3, 6, 5, and is supplied to the sliding surface of the seal ring 1 from the oil grooves 3, 6, 5 to form an oil film of a desired thickness on the sliding surface of the seal ring 1. The hydraulic oil flowing into the first oil groove 3 is limited, by the flow resistance of the bypass oil passage 6 formed into a predetermined length, in the amount by which it leaks out via the second oil groove 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal ring which is disposed between members which rotate relative to each other such as an automatic transmission and which is used for preventing oil leakage between both members.

[0002]

2. Description of the Related Art Conventionally, for example, when hydraulic oil is supplied from a case to a hydraulic servo of a friction engagement element such as a clutch drum, hydraulic oil is supplied from an oil hole provided in a non-rotating member to an oil hole provided in a rotating member. A seal ring seals between the two members that rotate relative to each other so that the hydraulic oil does not leak to other parts when the oil flows.

FIG. 5 shows a usage state of such a seal ring.

As shown in FIG. 5, the seal ring 30
Are arranged on both sides of oil holes 16 and 17 provided at corresponding positions of the fixed-side member 13 and the rotating-side member 12, respectively, and from the oil hole 16 of the fixed-side member 13 to the oil hole 17 of the rotating-side member 12. When the hydraulic oil flows to the right side, the seal ring 30 on the right side in the figure is pressed against the right side surface 31 of the oil groove 15 by the hydraulic pressure, and the seal ring 30 on the left side in the figure is hydraulically pressed into the oil groove 1.
The hydraulic oil is prevented from flowing out from the gap between the two members 12 and 13 which are pressed against the left side surface 32 of the No. 5 and rotate relative to each other.

[0005]

However, in such a conventional seal ring 30, the side surface 33 of the seal ring 30 is the side surface 31 of the oil groove 15 due to the pressure of the hydraulic oil flowing through the oil holes 16 and 17.
Since it is pressed against 32 and comes into sliding contact with the side surfaces 31 and 32 of the oil groove 15, burning may occur due to heat generation due to sliding resistance, or drag loss (power loss) may increase.

In order to solve such a problem, as shown in FIG. 6, the radial grooves 3 are formed on the side surface 33 of the seal ring 30.
5 are provided, or as shown in FIG. 7, the seal ring 3
Although the oil reservoir 36 was provided on the side surface 33 of 0,
When the radial grooves 35 are provided, the sealing performance is deteriorated, and when the oil sump 36 is provided, the abrasion resistance is deteriorated due to sludge accumulated inside the oil sump 36.

Therefore, an object of the present invention is to provide a seal ring which can solve the above-mentioned problems of the prior art by allowing oil to intervene in the sliding portion on the side surface of the seal ring within a range where the sealing property does not matter.

[0008]

That is, according to the present invention, the fixed side member (13) and the rotating side member (12) are arranged on both sides of oil holes (16, 17) provided so as to face each other. ,
The two members (12, 13) are attached to either one of the two members (12, 13) in close contact with the side surface (19) of the oil groove (15) formed in the other of the both members (12, 13). 1
A seal ring (1) that seals between the inner side and the outer side (7) of the seal ring and extends from the inner side (7) of the seal ring toward the outer side (9) of the seal ring. First oil groove (3) and seal ring outer peripheral side (9)
A second oil groove (5) which is open to the outer peripheral side (9) of the seal ring and extends toward the inner peripheral side (7) of the seal ring, and the ends of the first oil groove (3) and the second oil groove (3). A bypass oil groove (6) having a predetermined flow path length for communicating the ends of the oil groove (5);
Is formed on the side surface (2) of the seal ring which is in close contact with the side surface (19) of the oil groove (15).

The present invention also provides, for example, as shown in FIG.
The bypass oil groove (6) is a circumferential groove extending in the circumferential direction of the seal ring side surface (2) at a substantially central portion, and the first oil groove (3) and the second oil groove (5) are mutually It is characterized by being arranged at different circumferential positions.

Further, in the present invention, as shown in FIG. 3, for example, the bypass oil groove (6) is a circumferential groove (6a) extending in the seal ring circumferential direction and a radial groove (22) extending in the seal ring radial direction. It is characterized in that it is a curved groove (21) formed by combining

In addition, the present invention is characterized in that an oil sump (23) is formed in the bypass oil groove (6) as shown in FIG. 4, for example.

[0012]

The seal ring (1) of the present invention having the above-described structure has a fixed side member (1) as shown in FIG.
3) through the oil hole (16) to the oil hole (1) of the rotary member (12).
When the hydraulic oil is supplied to 7), the hydraulic oil is supplied to both members (1
It is introduced into the oil groove (15) through the gap between 2, 13),
The pressure of this hydraulic oil presses against the side surface (19) of the oil groove (15). At this time, the working oil flows into the first oil groove (3), the bypass oil groove (6) and the second oil groove (5) of the seal ring (1). As a result, the seal ring (1)
The sliding surface of the first oil groove (3), the bypass oil groove (6)
And oil is supplied from the second oil groove (5).

The hydraulic oil introduced into the first oil groove (3) is squeezed by a bypass oil groove (6) formed to have a predetermined flow path length, and is squeezed through the second oil groove (5). The amount that passes and leaks to the outside is regulated.

Further, the seal ring (1) is provided with an oil groove (15) by the pressure of the hydraulic oil introduced into the first oil groove (3), the bypass oil groove (6) and the second oil groove (5). ) Side view (19)
The contact pressure with is reduced.

The reference numerals in the above parentheses are for comparison with the drawings and do not limit the structure of the present invention.

[0016]

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

FIG. 1 is a front view of a seal ring showing an embodiment of the present invention. The seal ring 1 has a substantially rectangular cross section (see FIG. 2) and is formed in an annular shape. Then, on one of the side surfaces 2 of the seal ring 1, a first oil groove 3 and a second oil groove 5, and an end portion of the first oil groove 3 and an end portion of the second oil groove 5 are formed. A bypass oil groove 6 that communicates the parts is formed.

Of these, the first oil groove 3 opens on the seal ring inner peripheral side 7 and extends from the seal ring inner peripheral side 7 toward the seal ring outer peripheral side 9 to approximately the center of the seal ring side surface 2. There is.

Further, the second oil groove 5 is formed at a different circumferential position with respect to the first oil groove 3, is opened to the outer peripheral side 9 of the seal ring, and extends from the outer peripheral side 9 of the seal ring to the inner peripheral side of the seal ring. It extends toward the side 7 almost to the center of the seal ring side surface 2.

Further, the bypass oil groove 6 is a circumferential groove that extends in the circumferential direction at a substantially central portion of the seal ring side surface 2, and as described above, the end portion of the first oil groove 3 and the second oil groove 3. The ends of the oil grooves 5 communicate with each other.

In this embodiment, the seal ring side oil groove 10 composed of the first oil groove 3, the circumferential groove 6 and the second oil groove 5 is used.
In the above description, the embodiment in which the seal ring side surface 2 is provided at two locations in the circumferential direction is shown. However, only one seal ring side oil groove 10 may be provided, or two or more seal groove side oil grooves 10 may be provided.

Further, the groove width and groove depth of the first oil groove 3 and the second oil groove 5, the flow path (groove) length, groove width and groove depth of the circumferential groove 6 are desired. To produce a flow path resistance of Further, the circumferential groove 6 may be endlessly continuous.

As shown in FIG. 8, for example, the circumferential groove (the detour oil groove) 6 has a longer resistance to the flow of the hydraulic oil, and functions to suppress the deterioration of the sealing property. In FIG. 8, the circumferential groove 6 extends from the end of the first oil groove 3 to the end of the second oil groove 5 in a counterclockwise direction (counterclockwise direction in the figure) to a length of approximately a half circumference. It is designed to communicate with the department. Then, the first oil groove 3, the second oil groove 5, and the circumferential groove 6
A pair of seal ring side oil grooves 10 are provided on the seal ring side surface 2 as in the embodiment of FIG.

The seal ring 1 thus formed is
As shown in FIG. 2, the outer peripheral surface 11 is fitted into the rotation side member 12 and is housed in the oil groove 15 formed in the fixed side member 13. And this seal ring 1
Is a hydraulic oil introduced into the oil groove 15 through the gap between the two members 12 and 13 when the hydraulic oil is supplied from the oil hole 16 of the fixed member 13 to the oil hole 17 of the rotary member 12. By the pressure of, the seal ring side surface 2 having the seal ring side oil groove 10 is pressed against the side surface 19 of the oil groove 15, and the outer peripheral surface 11 thereof is pressed against the inner peripheral surface 20 of the rotating side member 12. .

At this time, the fixed side member 13 of the seal ring 1
The working oil is supplied from the seal ring side oil groove 10 to the sliding surface of and to form an oil film having a desired thickness.

As a result, burning of the sliding surface of the seal ring 1 is prevented, and the durability of the seal ring 1 is improved.

Further, in the seal ring 1, since the seal ring side oil groove 10 is formed so as to generate the desired flow path resistance as described above, the leakage amount of the hydraulic oil can be regulated within a range where no problem occurs. It also exerts the desired sealing function.

In addition, in the seal ring 1 of this embodiment, since the hydraulic oil is introduced into the oil groove 10 on the seal ring side, the oil pressure pressed against the side surface 19 of the oil groove 15 is reduced and the sliding surface is worn. Is reduced.

FIG. 3 shows a second embodiment of the present invention.

That is, in this embodiment, the end portions of the first oil groove 3 and the second oil groove 5 are connected to each other by the bent groove 21. Of these, the bent groove 21 is a combination of a circumferential groove 6a extending in the seal ring circumferential direction and a radial groove 22 extending in the seal ring radial direction, and functions as the bypass oil groove 6 of the first embodiment. . The first in the present embodiment
The oil groove 3 and the second oil groove 5 of the first embodiment are the same as those of the first embodiment.
Are formed shorter than the oil groove 3 and the second oil groove 5.

As a result, the seal ring side oil groove 10 of this embodiment can generate a large flow resistance with a short circumferential length.

FIG. 4 shows a third embodiment of the present invention.

That is, in this embodiment, a plurality of oil sumps 23 are formed in the circumferential groove 6 of the first embodiment to increase the amount of oil stored on the sliding surface of the seal ring 1 and to improve the flow path resistance. It is a bigger one. An appropriate number of the oil sumps 23 are formed.

Although the seal ring 1 described in the above embodiment is fitted in the rotary member 12 and housed in the oil groove 15 formed in the fixed member 13, the seal ring 1 is fitted in the fixed member. Alternatively, they may be housed in an oil groove formed in the rotary member.

[0035]

As described above, according to the present invention, the first oil groove, the bypass oil groove and the second oil groove formed on the side surface of the seal ring are provided in the sliding contact portion between the side surface of the seal ring and the side surface of the oil groove. Since hydraulic oil is supplied from the groove and an oil film with a desired thickness is always formed, there is no burning on the sliding surface of the seal ring,
The durability of the seal ring is improved.

Further, according to the present invention, the first oil groove, the bypass oil groove and the second oil groove are formed on the side surface which is the seal surface of the seal ring, and the hydraulic oil is introduced into each of these oil grooves. For,
The contact pressure between the seal ring and the side surface of the oil groove is reduced, wear of the sliding surface of the seal ring is reduced, and in combination with the above effect, the durability of the seal ring can be effectively improved.

Further, according to the present invention, the bypass oil groove is formed in a predetermined length, and the flow of the hydraulic oil from the first oil groove to the second oil groove is restricted by the bypass oil groove, and each of these oil grooves is formed. Since the amount of oil leaking to the outside through the range can be regulated within a range that does not cause a problem, the above respective effects can be obtained without impairing the sealing property.

[Brief description of drawings]

FIG. 1 is a front view of a seal ring showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a side surface of the seal ring (A in FIG. 1).
-A sectional view taken along line A).

FIG. 3 is a front view of a main part of a seal ring showing a second embodiment of the present invention.

FIG. 4 is a front view of a main part of a seal ring showing a third embodiment of the present invention.

FIG. 5 is a view showing a conventional seal ring in use.

FIG. 6 is a front view of a main part of a conventional seal ring.

FIG. 7 is a front view of a main part of another conventional seal ring.

FIG. 8 is a front view of a seal ring showing an application example of the first embodiment of the present invention.

[Explanation of symbols]

 1 Seal Ring 2 Side Surface 3 First Oil Groove 5 Second Oil Groove 6 Detour Oil Groove (Circumferential Groove) 6a Circumferential Groove 7 Seal Ring Inner Circumferential Side 9 Seal Ring Outer Radial Side 12 Rotating Side Member 13 Fixed Side Member 15 Oil groove 16, 17 Oil hole 19 Side surface (oil groove) 21 Bending groove 22 Radial groove 23 Oil sump

Claims (4)

[Claims] 1. A fixed-side member and a rotating-side member are disposed on both sides of an oil hole provided so as to face each other, are attached to either one of the both members, and are formed on the other of the both members. In the seal ring that closely contacts the side surface of the formed oil groove and seals between the two members, the first oil groove that opens to the inner peripheral side of the seal ring and extends from the inner peripheral side of the seal ring toward the outer peripheral side of the seal ring And a second oil groove which is open to the outer peripheral side of the seal ring and extends from the outer peripheral side of the seal ring toward the inner peripheral side of the seal ring, and the ends of the first oil groove and the end of the second oil groove. A seal ring, characterized in that a bypass oil groove having a predetermined flow path length communicating with the bypass oil groove is formed on a side surface of the seal ring in close contact with a side surface of the oil groove. 2. The bypass oil groove is a circumferential groove extending in a circumferential direction at a substantially central portion of a side surface of a seal ring, and the first oil groove and the second oil groove are arranged at different circumferential positions. The seal ring according to claim 1, wherein the seal ring is formed. 3. The seal ring according to claim 1, wherein the bypass oil groove is a bent groove formed by combining a circumferential groove extending in the seal ring circumferential direction and a radial groove extending in the seal ring radial direction. . 4. The seal ring according to claim 2, wherein an oil sump is formed in the bypass oil groove.