JP3293075B2 - Lip type seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lip seal provided for sealing the periphery of a rotating shaft of a refrigerator compressor such as a cooling device.

[0002]

2. Description of the Related Art As a typical conventional example of a lip-type seal for sealing the periphery of a rotating shaft of a refrigerator compressor, as shown in FIG. 2, an lip member 10 made of an elastomer, an inward flange 21 at a front end and a caulking at a rear end are provided. The metal outer ring 20 is formed such that the portions 22 are formed by bending to the inner diameter side, and the portion excluding the caulking portion 22 is embedded in the outer diameter portion 11 of the elastomer lip member 10.
A synthetic resin lip member 30 having an outer diameter portion 31 in contact with the back surface of the outer diameter portion 11 of the elastomer lip member 10;
It is well-known that an inner ring 40 made of metal is held in contact with the caulking portion 22 and presses the back surface of the synthetic resin lip member 30. The outer peripheral surface of the outer ring 20 is covered with a crimping part 12 formed on the outer diameter part 11 of the elastomer lip member 10. An annular protrusion (not shown) is formed on the back surface of the outer diameter portion 11 of the elastomer lip member 10, and the annular protrusion is pressed against the front surface of the outer diameter portion 31 of the synthetic resin lip member 30. Thus, the airtightness between the lip members 10 and 30 is maintained.

[0003] That is, this lip-type seal is
Is press-fitted into the shaft hole 1a of the shaft seal housing 1 via the crimping portion 12 made of an elastomer while the movement in the axial direction is restricted by the step portion 1b formed in the shaft hole 1a and the retaining ring 2. The head 13a formed at the tip of the inner diameter portion 13 of the elastomeric lip member 10 that curves and extends toward the inside A of the machine, which is a sealed space, slides on the outer peripheral surface of the shaft 3 inserted into the shaft hole 1a. In-flight A
This prevents the refrigerant and refrigerating machine oil compressed by the above from leaking from the shaft circumference into the atmosphere B, which is an anti-sealed space. An inner diameter portion 32 of the synthetic resin lip member 30 that curves and extends toward the inside A of the machine supports the inner diameter portion 13 of the elastomer lip member 10 that receives the pressure of the inside A of the machine from the inner circumferential side.

[0004] In the following description, "front" means a surface facing the inside of the aircraft A, which is a sealed space, and "back" means a surface facing the atmosphere B, which is a non-sealed space.
The “front end” refers to the end on the in-machine A side, and the “rear end” refers to the end on the atmosphere B side.

[0005]

This type of lip seal has a lip member 30 made of synthetic resin and an inner ring 40 on the inner periphery of an outer ring 20 in which the lip member 10 made of elastomer is integrated.
Are successively inserted and the rear end of the outer ring 20 is swaged to assemble, and the outer diameter portion 31 of the synthetic resin lip member 30 is formed via the inner ring 40 by the formation of the swaged portion 22. Is pressed against the back surface of the outer diameter portion 11.
Therefore, of the outer diameter portion 11 of the lip member 10 made of the elastomer, the rear side portion 11 including the annular projection (not shown)
Since a is compressed in the axial direction between the inward flange 21 at the tip of the outer ring 20 and the outer diameter portion 31 of the synthetic resin lip member 30, distortion in the inner diameter direction due to the stress due to this compression (elastomer material). Movement) ε is generated, but such a stress does not occur in a portion 11 b of the outer diameter portion 11 of the lip member 10 that is closer to the front than the inward flange 21. The inner diameter portion 13 of the lip member 10 is displaced as indicated by the arrow F, and as a result, the interference of the head 13a of the lip member 10 made of the elastomer with the outer peripheral surface of the shaft 3 is reduced, which may cause leakage. .

The present invention has been made in view of the above circumstances, and a technical problem thereof is that when the rear end of an outer ring is caulked in assembling a lip-type seal, a lip member made of an elastomer is used. It is another object of the present invention to prevent a reduction in the interference of the head of the inner diameter of the elastomer lip member with respect to the shaft due to the stress generated on the rear side portion of the outer diameter portion.

[0007]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the present invention provides an elastomer lip member having an inner diameter portion extending toward the sealed space, an outer ring in which an inward flange at an end bent toward the inner diameter side is embedded in an outer diameter portion of the elastomer lip member, and an outer diameter portion is provided. A synthetic resin lip member abutting against the back surface of the outer diameter portion of the elastomer lip member and extending the inner diameter portion to the sealed space side to support the inner diameter portion of the elastomer lip member from the inner circumference side; An inner ring supported by a caulking portion at the rear end of the ring and abutting against the back surface of the synthetic resin lip member, wherein the inner rim of an inward flange of the outer ring is formed of the elastomer lip. A member which is bent so as to be unevenly distributed on the back side in the outer diameter portion of the member, and a concave portion which is located on the outer diameter side of the inner diameter edge is formed in a portion of the outer diameter portion of the elastomer lip member on the back side from the inward flange. It is.

[0008]

The inner edge of the inward flange of the outer ring embedded in the outer diameter portion of the elastomer lip member is bent so as to be unevenly distributed toward the synthetic resin lip member, so that the rear end of the outer ring is caulked. As a result, the rear side portion of the outer diameter portion of the elastomer lip member, which is axially compressed between the outer diameter portion of the synthetic resin lip member and the inward flange of the outer ring, moves in the inner diameter direction due to stress. Block. On the other hand, since a concave portion is formed on the back surface of the outer diameter portion of the elastomer lip member on the outer diameter side of the inner diameter edge, the compressed elastomer on the back side portion reduces this concave portion. By moving, the stress due to compression is effectively absorbed. For this reason,
When the rear end of the outer ring is caulked at the rear end, the rear side portion of the outer diameter portion of the elastomer lip member moves toward the inner diameter side, thereby preventing displacement of the inner diameter portion in the direction of reducing interference.

[0009]

FIG. 1 shows a preferred embodiment of a lip seal according to the present invention. That is, according to this embodiment, the portion other than the caulking portion 22 at the rear end is the outer peripheral crimping portion 1.
The outer ring 20 buried in the outer diameter portion 11 of the elastomer lip member 10 including the inner flange 2 has an inward flange 21 at a tip extending toward the inner diameter side.
Is bent so as to be unevenly distributed on the synthetic resin lip member 30 side in the outer diameter portion 11.
The inward flange 21 of the outer ring 20 is provided on the back surface of the back side portion 11 a of the outer diameter portion 11 of the elastomer lip member 10.
An annular concave portion 11b of an appropriate size is formed on the outer diameter side of the inner diameter edge 21a of the first hole. The configuration of the other parts is almost the same as that of the above-described lip-type seal of FIG. 2, and the description thereof is omitted.

In assembling the lip-type seal, as in the prior art, the synthetic resin lip member 30 and the inner ring 40 are sequentially inserted into the inner periphery of the outer ring 20 in which the elastomer lip member 10 is integrated. Since the rear end of the outer ring 20 is caulked, the rear side portion 11a of the outer diameter portion 11 of the elastomer lip member 10 is
And the outer diameter portion 31 of the synthetic resin lip member 30 is compressed in the axial direction, and the accompanying movement of the rear side portion 11 a toward the inner diameter side of the elastomer material is caused by the inward flange 21 of the outer ring 20. Of the inward flange 21 bent toward the lip member 30 made of synthetic resin. Since the rear side portion 11a has a concave portion 11b formed on the outer diameter side, the elastomer of the rear side portion 11a compressed in the axial direction moves so as to reduce the concave portion 11b, and the stress due to the compression is reduced. Is absorbed and mitigated. For this reason, the inner diameter portion 13 of the elastomer lip member 10 is not displaced by a stress difference between the back side and the front side, which reduces the interference of the head 13a with the outer peripheral surface of the shaft 3.

[0011]

According to the lip seal of the present invention, the rear side portion of the outer diameter portion of the elastomer lip member, which is compressed in the axial direction by caulking the rear end of the outer ring during assembly, has the inner diameter. Since it does not move so as to be pushed out in the direction, the inner diameter portion of the elastomer lip member is effectively prevented from being displaced in the direction of decreasing the interference, and excellent sealing performance can be achieved.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a use state of an embodiment of a lip-type seal according to the present invention by cutting along a plane passing through an axis.

FIG. 2 is a half sectional view showing a use state of an example of a conventional lip-type seal, cut along a plane passing through an axis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 3 Shaft 10 Elastomer lip member 11 Outer diameter part 11a Back side part 11b Depression 13 Inner diameter part 20 Outer ring 21 Inward flange 21a Inner diameter edge 22 Caulking part 30 Synthetic resin lip member 40 Inner ring

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takeshi Yamada 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Koichiro Oiyama 1212 Abe, Ochiai-cho, Takahashi-shi, Okayama Eagle (56) References JP-A-3-223571 (JP, A) JP-A-7-139633 (JP, A) JP-A-4-125363 (JP, A) JP-A-2-43562 (JP, U) Japanese Utility Model Showa 61-186868 (JP, U) Japanese Utility Model 5-30637 (JP, U) Japanese Utility Model Showa 62-124371 (JP, U) Japanese Utility Model Utility Model 2-146269 (JP, U) Kaihei 3-17473 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16J 15/32

Claims (1)

(57) [Claims] 1. An elastomer lip member having an inner diameter portion extending toward a sealed space side, an outer ring having a tip inwardly bent toward the inner diameter side embedded in an outer diameter portion of the elastomer lip member, and an outer diameter portion having an outer diameter portion. A synthetic resin lip member which is in contact with the back surface of the outer diameter portion of the elastomer lip member and whose inner diameter portion extends toward the sealed space to support the inner diameter portion of the elastomer lip member from the inner circumference side; An inner ring supported by a caulking portion at the rear end of the ring and abutting against the back surface of the synthetic resin lip member, wherein an inner diameter edge of an inward flange of the outer ring is within an outer diameter portion of the elastomer lip member. A lip mold, which is bent so as to be unevenly distributed on the back side, and a concave portion located on the outer diameter side of the inner diameter edge is formed in a portion on the back side from the inward flange of the outer diameter portion of the elastomeric lip member. sticker.