JPH0741142U - Sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] A sealing device that is mounted in a mounting groove 3 formed in one member 1 of two members 1 and 2 that move relative to each other and slides with the other member 2 in the axial direction. (EN) Provided is a sealing device having a compact structure by reducing the occupied space. [Structure] The buffer ring 4, the packing 10, and the backup ring 13 are integrated into one mounting groove 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a sealing device.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 4, two mounting grooves 23 and 24 are provided in one member 21 of the two members 21 and 22 that move relative to each other, and one of the two mounting grooves 23 and 24 is mounted. There is known a sealing device in which a buffer ring 25 is incorporated in the mounting groove 23 of the above and a packing 26 and a backup ring 27 are incorporated in the other mounting groove 24.

[0003]

[Problems to be solved by the device]

 However, according to the above-mentioned conventional technique, since a predetermined space 28 has to be provided between the two mounting grooves 23, 24, the occupied space for the axial length of the sealing device is large (the gland portion is There is a problem.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised to solve the above-mentioned problems in the prior art, and in order to achieve this object, it is provided on one of the two members that move relative to each other. In a sealing device that is mounted in a mounting groove and slides with the other member, a sealing device is characterized in that a buffer ring, a packing, and a backup ring are integrally assembled in one mounting groove.

[0005]

[Action]

 If the buffer ring, packing, and backup ring are assembled together in one mounting groove, the above intervals can be eliminated even if the buffer ring, packing, and backup ring are the same size as conventional ones. In addition, the space occupied by the length of the sealing device in the axial direction can be reduced by that much.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, one of the two members 1 and 2 that move relative to each other is provided with one mounting groove 3, and this one mounting groove 3 has a high pressure on the left side of the drawing. The buffer ring 4, the U packing 10 and the backup ring 13 are incorporated in order from the side, and an adapter 15 is interposed between the buffer ring 4 and the U packing 10. The two members 1 and 2 that move relative to each other are, for example, a housing and a shaft that is inserted in a shaft hole provided in the housing so as to be movable back and forth.

The buffer ring 4 is formed by vulcanizing and adhering elastic bodies 6 and 7 made of rubber-like elastic material, which are annular, to the inner peripheral surface and the outer peripheral surface of a synthetic resin ring main body 5, respectively. Reference numerals 6 and 7 each have a substantially semicircular cross-sectional shape and are pressed against the outer peripheral surface of the other member 2 or the bottom wall 3a of the mounting groove 3 with a predetermined tightening margin. Further, in the high pressure side end surface 5a of the ring body 5, as shown in FIGS. 2 and 3, a plurality of concave groove-shaped pressure flow paths 8 extending from the inner peripheral edge 5b to the outer peripheral edge 5c are equally arranged (for example, four evenly arranged). It is provided.

The U packing 10 is formed of a rubber-like elastic material, and the pressure receiving groove 11 faces the high pressure side. The backup ring 13 is molded of synthetic resin and has a substantially rectangular cross section. The adapter 15 is formed of synthetic resin into an annular shape, and is formed into a substantially rectangular cross-sectional shape, and the low pressure side end surface 15a combined with the pressure receiving groove 11 of the U packing 10 does not damage the U packing 10 at the corners. It is molded into a substantially arcuate cross-sectional shape. Further, the adapter 15 is provided with a plurality of hole-shaped pressure communication passages 16 extending from the inner peripheral surface to the outer peripheral surface thereof at equal intervals.

The sealing device having the above-mentioned structure reduces the high pressure on the left side of the drawing in the buffer ring 4 (pressure buffering) and seals the reduced pressure in the U packing 10. More specifically, the sealing device will be described below. Operate.

That is, the buffer ring 4 is normally pressed against the high-pressure side wall 3b of the mounting groove 3 via the adapter 15 by the elastic restoring force of the U-packing 10. However, the buffer ring 4 does not contact the high-pressure side end surface 5a of the ring body 5. Since the pressure channel 8 is provided and high pressure can be introduced to the outer peripheral side thereof, both the inner peripheral side elastic body 6 and the outer peripheral side elastic body 7 exert a pressure reducing action. When the high pressure becomes significantly large, such as when an impact pressure is applied, the buffer ring 4 is pushed by this high pressure and moves to the low pressure side. However, the buffer ring 4 is supported by the U packing 10 via the adapter 15 and its posture Therefore, the elastic body 6 on the inner peripheral side and the elastic body 7 on the outer peripheral side still exert a pressure reducing action. Therefore, in any case, since the U packing 10 is decompressed and seals the reduced pressure, the U packing 10 can be sealed without leaking. Further, since the pressure acting on the U packing 10 is small, the wear of the sliding portion of the U packing 10 can be suppressed to a small level.

When the pressure to be sealed is hydraulic, between the elastic body 6 on the inner peripheral side of the buffer ring 4 and the outer peripheral surface of the other member 2, the elastic body 7 on the outer peripheral side and the bottom wall 3 a of the mounting groove 3 are provided. An oil film that reduces sliding resistance is formed between the U packing 10 and the outer peripheral surface of the other member 2. Therefore, the wear of these sliding parts can be suppressed to a small level.

Due to this, the adapter 15 opens a space between the buffer ring 4 and the U packing 10 to prevent the buffer ring 4 and the U packing 10 from directly contacting each other, so that the buffer ring 4 is depressurized. The U-packing 10 is designed to have only a sealing action, and has the same function as the wall 29 between the two mounting grooves 23 and 24 in the above-mentioned conventional technique (the presence of this adapter 15 Regarding the concern that the occupied space in the axial direction of the sealing device may be the same as the conventional one, the occupied space by the adapter 15 is the high pressure side of the buffer ring 23 in the above conventional technique. Offset by the sum of the axial width 31 of the space 30 set to 1 and the axial width 33 of the space 32 set on the high-pressure side of the U packing 26. Since there is a surplus, the interval 28 can be surely reduced.

[0014]

[Effect of device]

 The present invention has the following effects. That is, since the buffer ring, the packing, and the backup ring are integrated into one mounting groove, the occupied space for the axial length of the sealing device can be reduced as compared with the conventional one, and the axial length can be reduced. It is possible to provide a sealing device having a compact structure. Also, by reducing the required number of mounting grooves, it is possible to reduce the number of processing steps and improve the yield rate of steel materials.

[Brief description of drawings]

FIG. 1 is a half cutaway view of a sealing device according to an embodiment of the present invention.

FIG. 2 is a partial end view of buffering.

3 is a sectional view taken along line AA in FIG.

FIG. 4 is a half-cut sectional view of a sealing device according to a conventional example.

[Explanation of symbols]

 1 One member 2 Other member 3 Mounting groove 3a Bottom wall 3b Side wall 4 Buffering 5 Ring body 5a, 15a End surface 5b Inner peripheral edge 5c Outer peripheral edge 6,7 Elastic body 8 Pressure channel 10 U packing 11 Pressure receiving groove 13 Backup ring 15 Adapter 16 Pressure communication passage

Claims (1)

[Scope of utility model registration request] 1. A sealing device which is mounted in a mounting groove (3) provided in one member (1) of two members (1) and (2) that move relative to each other and slides with the other member (2). In the mounting groove (3), the buffering (4) and packing (1
0) and the backup ring (13) are assembled together.