JPH04117959U - Lip type seal - Google Patents

Abstract

(57) [Summary] [Purpose] Inner diameter sliding portion 15 of PTFE lip member 15
This prevents deterioration of the rubber lip member 12 due to the accumulation of heat due to sliding in a. [Structure] Inner diameter sliding portion 12a of rubber lip member 12
extends toward the sealed space A side, and the inner diameter sliding portion 15a of the PTFE lip member 15 extends toward the anti-sealed space B side facing away from the rubber lip member 12, and both inner diameter sliding portions 12a, 15
A is separated from each other in the axial direction, thereby preventing the accumulation of sliding heat.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an improvement in a lip-type seal that seals around a rotating shaft.

0002

[Conventional technology]

Traditionally, shaft seals have been used, for example, in car cooler compressors. There is a lip type seal as shown in FIG. This lip type seal is A metal case that is tightly fitted and fixed via an O-ring 7 to a mounting portion 6a formed in the shaft hole of the metal case. 1, on the sealed space A side, the base of the outer diameter is reinforced with a metal ring 3. A lip member 2 made of wood, a lip member 4 made of PTFE on the anti-sealed space (atmosphere) B side, and A metal backup supporting the PTFE lip member 4 from the side opposite to the sealed space B. The pull 5 is held with its outer diameter portions in close contact with each other, and each lip portion The inner diameter sliding parts 2a and 4a of the members 2 and 4 are in airtight sliding contact with the outer peripheral surface of the shaft 8, creating a sealed space. Preventing the refrigerant and refrigeration oil in A from leaking into the non-sealed space B, that is, into the atmosphere. It is something.

0003

[Problem that the idea aims to solve]

However, according to the above lip type seal, the sliding portion 4a of the lip member 4 made of PTFE is the shaft under the tightening force of the rubber lip member 2 and the pressure of the sealed space A. Since it is in sliding contact with the outer circumferential surface of the rubber lip member 2, the amount of heat generated is large. Because it is sandwiched between the outer circumferential surface of the foot 12, heat tends to accumulate, resulting in overheating. easy to become. The sliding portion 4a of this PTFE lip member 4 is damaged due to overheating. as it softens (plasticizes), its durability and sealing performance are significantly impaired. Instead, the sliding portion 2a of the rubber lip member 2 generates heat due to its own sliding, as well as P The sliding part 4a of the TFE lip member 4 is affected by the heat accumulated, so its elasticity is reduced. There was a problem that the sealing performance deteriorated, causing cracks and impairing sealing performance.

0004 In view of these points, the lip type seal of the present invention has a PTFE lip member with a sliding surface. The challenge was to prevent the sealing performance of the rubber lip member from deteriorating due to dynamic heat accumulation. It is what was done.

[0005]

[Means to solve the problem]

In order to solve the above problem, this invention has a rubber on the inner periphery of the metal case on the side of the sealed space. The lip member made of wood and the lip member made of PTFE on the side opposite to the sealed space are held together. , a lip type in which the inner diameter sliding portions of both lip members are brought into airtight sliding contact with the outer peripheral surface of the shaft. In the seal, the inner diameter sliding portion of the rubber lip member extends toward the sealed space, and P The inner diameter sliding part of the TFE lip member is opposite to this rubber lip member to prevent sealing. It has a configuration that extends toward the space side.

[0006]

[Effect]

According to the above configuration, the inner diameter sliding portion of the rubber lip member extending toward the sealed space side; The inner diameter sliding portions of the PTFE lip members that extend toward the opposite side of the sealed space are mutually opposite to each other. Since the inner diameter sliding part of the PTFE lip member is separated from the rubber lip member, It is not affected by the tightening force of the lip member or the heat of the inner diameter sliding part of the rubber lip member. In addition, conversely, the inner diameter sliding part of the rubber lip member is also the inner diameter of the PTFE lip member. Since it is not easily affected by the heat of the radial sliding part, overheating may occur due to the accumulation of sliding heat. do not have.

[0007]

【Example】

FIG. 1 shows an embodiment of the lip-type seal of the present invention. Around the periphery, the base of the outer diameter on the side of the sealed space A is made of rubber material and reinforced with a metal ring 13. The lip member 12 and the back surface of the rubber lip member 12, that is, the unsealed space (large q) Metal backup ring 14 that supports the B side surface and its anti-sealed space B side PTFE lip member 15 and a metal spacer 1 on the side opposite to the sealed space B. 6 are held together with their respective outer diameter portions in close contact with each other.

[0008] The rubber lip member 12 and the PTFE lip member 15 are curved opposite to each other. The inner diameter sliding portion 12a of the rubber lip member 12 faces toward the sealed space A side. On the other hand, the inner diameter sliding portion 15a of the PTFE lip member 15 has an anti-sealing shape. It is formed to protrude toward the gap B side.

[0009] This lip type seal is installed when the case 11 is formed in the shaft hole of the housing 17. Each lip member 12, 16 inner diameter sliding parts 12a, 16a are in airtight sliding contact with the outer peripheral surface of the shaft 19. Therefore, the refrigerant and refrigeration oil in sealed space A will leak into the atmosphere in non-sealed space B. to prevent

0010 In the above configuration, the inner diameter sliding portion 12a of the rubber lip member 12 and the PTF The inner diameter sliding portion 15a of the E-made lip member 15 has a groove for sliding with the shaft 19, respectively. Although heat is generated accordingly, the rubber lip member 12 is removed from the back door from the anti-sealed space B side. Since it is supported by the coupling ring 14, the diameter reduction deformation due to the pressure in the sealed space A is prevented. In addition, the inner diameter sliding portion 15a of the PTFE lip member 15 is regulated by the rubber material lip member 15. Since it is not subject to the tightening force of the top member 12 and the pressure of the sealed space A, both inner diameter sliding parts The sliding load on 12a and 15a is small, and heat generation is suppressed. Moreover, both inner diameter sliding parts Since 12a and 15a are separated from each other in the axial direction, the PTFE lip portion The inner diameter sliding portion 15a of the member 15 is exposed to the heat of the inner diameter sliding portion 12a of the rubber lip member 12. On the contrary, the inner diameter sliding portion 12a of the rubber lip member 12 is also less affected by PT. Since the inner diameter sliding portion 15a of the FE lip member 15 is not easily affected by heat, the sliding Overheating conditions due to the accumulation of dynamic heat do not occur.

[0011]

[Effect of the idea]

As described above, according to the present invention, the inner diameter sliding part of the lip member made of rubber material and the lip member made of PTFE Since the inner diameter sliding parts of the pull member are facing away from each other in the axial direction, the PTFE ring The inner diameter sliding part of the lip member is controlled by the tightening force of the rubber lip member and the rubber lip member. The inner diameter sliding part of the rubber lip member is less affected by heat, and the inner diameter sliding part of the rubber lip member is also The inner diameter sliding part of the PTFE lip member is less affected by heat, so it reduces the heat of sliding. Overheating due to accumulation does not occur, and the internal sliding part of the rubber lip member due to this overheating is Deterioration can be prevented and excellent sealing performance can be maintained for a long period of time.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing an embodiment of the present invention.

FIG. 2 is a half-cut sectional view showing an example of a conventional structure.

[Explanation of symbols]

11 Metal case 12 Rubber lip member 12a, 15a Inner diameter sliding part 15 PTFE lip member A Sealed space B Anti-sealed space

Claims (1)

[Scope of utility model registration request] Claim 1: A lip member made of a rubber material on the side of the sealed space and a lip member made of PTFE on the side opposite to the sealed space are integrally held on the inner periphery of a metal case, and the inner diameter sliding portions of both lip members are In a lip type seal that is in airtight sliding contact with the outer peripheral surface of the shaft, the inner diameter sliding portion of the rubber lip member extends toward the sealed space, and the inner diameter sliding portion of the PTFE lip member is
A lip-type seal characterized by extending toward the side opposite to the sealed space opposite to this lip member made of a rubber material.