JP2005214220A - Oil seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil seal 1, for suppressing early abrasion of a foreign matter seal 5 caused by metal powder E such as cutting powder contained in seal fluid A to elongate a service life of the seal. <P>SOLUTION: The oil seal 1 comprises: a main seal 4 slidably and closely contact with a mating member such as a shaft 3; and the foreign matter seal 5 disposed on a seal fluid A side of the main seal 4 to be slidably and closely contact with the mating member such as a shaft 3. The foreign matter seal 5 has a mounting ring 9 attached to the main seal 4, and a seal lip 10a supported by the mounting ring 9. The mounting ring 9 has magnetism for attracting the metal powder E contained in the seal fluid A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an oil seal which is a kind of sealing device.

  Conventionally, a double lip type oil having a main seal that is slidably in close contact with a mating member such as a shaft, and a foreign matter seal that is disposed on the sealing fluid side of the main seal and is also slidably in close contact with the mating member Seals are known. This oil seal is a two-stage oil seal in which foreign matter contained in a sealing fluid is sealed with a foreign matter seal, and then the sealing fluid itself is sealed with a main seal.

  However, according to this conventional oil seal, when a metal powder such as cutting powder is contained in the sealing fluid, the foreign powder seal wears early due to the metal powder being bitten by the sliding portion. Accordingly, since the metal powder reaches the main seal, there is a disadvantage that the main seal also wears out early.

  As shown in FIG. 2, as a prior art related to the present invention, an oil used in Japanese Utility Model Laid-Open No. 62-1000037 (Patent Document 1) for sealing lubricating oil to automobiles, industrial machines and the like. The seal 51 includes an oil seal 51 including a metal ring 52 having magnetism for adsorbing iron powder E and the like in the lubricating oil. The oil seal 51 includes a main seal 53. However, the present invention is different from the present invention in that it does not have a foreign matter seal.

  Further, according to the oil seal 51 shown in FIG. 2, when a large amount of iron powder E is adsorbed on the outer end face of the metal ring 52, the iron powder E cannot be held, so that a part of the iron powder E is shaft. It may fall on the peripheral surface of 54 and may approach the sliding part 55 between the main seal 53 and the shaft 54. Therefore, there is an inconvenience that the wear of the main seal 53 is accelerated by the falling and approaching iron powder E being bitten by the sliding portion.

Japanese Utility Model Publication No. 62-1000037

  In view of the above, the present invention suppresses early wear of a foreign matter seal by metal powder such as cutting powder contained in a sealing fluid in a double lip type oil seal having a main seal and a foreign matter seal. An object of the present invention is to provide an oil seal capable of extending the seal life.

  In addition to this, an object of the present invention is to provide an oil seal that can suppress the adsorbed metal powder from approaching the sliding portion of the foreign matter seal, and thus can extend the seal life.

  In order to achieve the above object, an oil seal according to claim 1 of the present invention includes a main seal that is slidably in close contact with a mating member such as a shaft, and is disposed on the sealing fluid side of the main seal. In the oil seal having a foreign matter seal slidably in contact with a mating member, the foreign matter seal has an attachment ring attached to the main seal and a seal lip supported by the attachment ring, and the attachment The ring is provided with magnetism for adsorbing the metal powder contained in the sealing fluid.

  The oil seal according to claim 2 of the present invention is the oil seal according to claim 1 described above, wherein a protruding portion protruding toward the axial sealing fluid side of the mounting ring is integrally formed on the seal lip of the foreign matter seal, The protruding portion is provided with an annular weir portion that prevents the metal powder adsorbed on the mounting ring from approaching the sliding portion between a mating member such as a shaft and the seal lip.

  As in the oil seal according to the first aspect of the present invention having the above-described configuration, when the magnetism for adsorbing the metal powder contained in the sealing fluid is imparted to the attachment ring of the foreign matter seal, It becomes possible to adsorb the powder.

  In addition to this, when an annular dam portion is provided at the projecting portion integrally formed with the seal lip of the foreign matter seal as in the oil seal according to claim 2 of the present invention having the above-described configuration, By the action, it is possible to block the metal powder adsorbed on the mounting ring from approaching the sliding portion of the foreign matter seal.

  The present invention has the following effects.

  That is, in the oil seal according to claim 1 of the present invention, since the magnetism for adsorbing the metal powder contained in the sealing fluid is provided on the attachment ring of the foreign matter seal, the metal powder is attracted by the magnetism. Can be adsorbed to the attachment ring of the foreign matter seal. Therefore, it is possible to prevent the foreign matter seal from being worn at an early stage due to a large amount of metal powder being caught in the sliding portion, thereby extending the seal life of the foreign matter seal. Further, if the seal life of the foreign matter seal can be extended, the seal life of the main seal can be extended accordingly.

  In addition to this, in the oil seal according to claim 2 of the present invention, a protruding portion that protrudes closer to the axial sealing fluid side than the mounting ring is integrally formed on the seal lip of the foreign matter seal, and this mounting portion is attached to the mounting ring. Since an annular weir is provided to prevent the adsorbed metal powder from approaching the sliding part between the mating member such as the shaft and the seal lip, it is adsorbed to the mounting ring by the damming action of this weir. It is possible to block the metal powder from approaching the sliding portion of the foreign matter seal. Therefore, it is possible to prevent inconvenience that the wear of the seal is accelerated by the metal powder once adsorbed as in the conventional case.

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

  FIG. 1 shows a half cut section of an oil seal 1 according to an embodiment of the present invention. The oil seal 1 is configured as follows.

  That is, first, a main seal 4 fitted to the inner periphery of the shaft hole of the housing 2 and slidably in close contact with the peripheral surface of the shaft 3 is provided. A foreign matter seal 5 that is slidably brought into close contact with the peripheral surface is provided.

  The main seal 4 is obtained by vulcanizing and bonding a rubber-like elastic body 7 to a metal reinforcing ring 6.

  The reinforcing ring 6 is formed by integrally forming a flange portion 6b radially inward at one axial end (right end in the figure) of a cylindrical portion 6a fitted to the inner periphery of the housing 2.

  The rubber-like elastic body 7 is attached to the outer peripheral surface of the cylindrical portion 6 a of the reinforcing ring 6 and seals between the reinforcing ring 6 and the housing 2, and the inner periphery of the cylindrical portion 6 a of the reinforcing ring 6. An inner peripheral seal portion 7b that seals between the reinforcing ring 6 and a mounting ring 9 of the foreign matter seal 5 to be described later, and an inner peripheral end of the flange portion 6b of the reinforcing ring 6, and is attached to the surface 3 And a seal lip 7c that is slidably in close contact with the peripheral surface of the seal lip 7c. The seal lip 7c is provided toward the sealing fluid A, and a garter spring 8 is fitted on the outer periphery thereof. .

  The foreign matter seal 5 is obtained by vulcanizing and bonding a rubber-like elastic body 10 to a metal mounting ring 9 for adsorbing the metal powder E contained in the sealing fluid A to the former mounting ring 9. It has magnetism.

  The attachment ring 9 is integrally formed with a flange portion 9b radially inward at the other axial end (left end in the figure) of the tubular portion 9a fitted on the inner peripheral side of the tubular portion 6a in the reinforcing ring 6. As described above, the magnetism is set so that the metal powder E contained in the sealing fluid A can be adsorbed to the mounting ring 9 as described above.

  The rubber-like elastic body 10 has a seal lip 10a that is attached to the inner peripheral end portion of the flange portion 9b of the mounting ring 9 and that is slidably in close contact with the peripheral surface of the shaft 3, and this seal lip. A projecting portion 10b projecting toward the axial sealing fluid A side from the mounting ring 9 is integrally formed on the outer peripheral side of the mounting ring 9, and the metal powder E adsorbed to the mounting ring 9 is formed on the outer peripheral surface of the projecting portion 10b with An annular weir portion 10c is provided to prevent the sliding portion with the seal lip 10a from dropping or approaching. Similar to the seal lip 7c of the main seal 4, the seal lip 10a is provided toward the sealing fluid A side. The protruding portion 10b is vulcanized and bonded to the outer end surface of the flange portion 9b of the mounting ring 9, and thus protrudes toward the sealed fluid A from the outer end surface.

  The oil seal 1 having the above-described configuration is a two-stage oil seal that seals foreign matter contained in the sealing fluid A with the foreign matter seal 5 and then seals the sealing fluid A itself with the main seal 4. It has a feature in that it exerts the operational effects.

  That is, first, since the magnetism for adsorbing the metal powder E contained in the sealing fluid A is given to the mounting ring 9 of the foreign matter seal 5, the metal powder E can be adsorbed by the attraction action by this magnetism. It is possible. Therefore, it is possible to prevent the foreign matter seal 5 from being worn out early by biting a large amount of the metal powder E into the sliding portion between the shaft 3 and the seal lip 10a, thereby extending the seal life of the foreign matter seal 5. Can do. Further, the seal life of the main seal 4 can be extended as the seal life of the foreign matter seal 5 is extended.

  At the same time, a protruding portion 10B that protrudes closer to the axial sealing fluid A side than the mounting ring 9 of the foreign matter seal 5 is integrally formed on the outer peripheral side of the seal lip 10a of the foreign matter seal 5 and the protruding portion 10b is attached to the mounting ring 9. Since the adsorbed metal powder E is provided with an annular dam portion 10c that prevents the metal powder E from dropping and approaching the sliding portion between the shaft 3 and the seal lip 10a, the dam portion 10c prevents the metal powder E from adhering to the mounting ring 9. It is possible to block the adsorbed metal powder E from dropping and approaching the sliding portion of the foreign matter seal 5. Therefore, it is possible to prevent the wear of the seal from being accelerated by the metal powder E once adsorbed as falling and approaching as in the above-described prior art, thereby prolonging the product life of the seal. it can.

  The configuration of the oil seal 1 according to the above embodiment can be variously changed within the technical scope of the present invention. For example, in the above-described embodiment, the entire attachment ring 9 is configured to have magnetism, but the metal powder E is adsorbed by the flange portion 9b of the attachment ring 9, so that only this flange portion 9b. May be made magnetic. Further, since the metal powder E is adsorbed on the outer end surface of the flange portion 9b in the mounting ring 9, only the outer end surface of the flange portion 9b may be magnetized.

The half cut sectional view of the oil seal concerning the example of the present invention Half cut sectional view of oil seal according to conventional example

Explanation of symbols

1 Oil seal 2 Housing 3 Shaft (mating member)
4 Main seal 5 Foreign matter seal 6 Reinforcement ring 6a, 9a Tubular part 6b, 9b Flange part 7, 10 Rubber elastic body 7a Outer seal part 7b Inner seal part 7c, 10a Seal lip 8 Garter spring 9 Mounting ring 10b Projection part 10c Weir E Metal powder

Claims (2)

A main seal (4) that is slidably in close contact with a mating member such as the shaft (3) and a mating member such as the shaft (3) that is disposed on the sealing fluid (A) side of the main seal (4). In the oil seal (1) having a foreign matter seal (5) which is slidably in close contact with,
The foreign matter seal (5) has an attachment ring (9) attached to the main seal (4), and a seal lip (10a) supported by the attachment ring (9),
An oil seal characterized in that the attachment ring (9) has magnetism for adsorbing the metal powder (E) contained in the sealing fluid (A). The oil seal of claim 1.
A projecting part (10b) projecting toward the axial sealing fluid (A) side from the mounting ring (9) is integrally formed on the seal lip (10a) of the foreign matter seal (5), and the projecting part (10b) An annular weir (10c) is provided to prevent the metal powder (E) adsorbed on the mounting ring (9) from approaching the sliding portion between the mating member such as the shaft (3) and the seal lip (10a). An oil seal characterized by that.

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