JP2005265078A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device preventing intrusion of foreign matter from a gap of bearing by installing a foreign matter removing member with a simple method without assembling a foreign matter removing lip on a main seal beforehand, and improving durability of the foreign matter removing member. <P>SOLUTION: When the main seal 10 is installed in an annular space formed between a shaft 11 and a housing 12 assembled relatively movably each other, the foreign matter removing member 20 made of a single member is installed. The foreign matter removing member 20 is gripped by the main seal 10 and the bearing 31 and a tip part 23 of the foreign matter removing member 20 is slidingly abutted on an inner ring 32 of the bearing 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sealing device used for a reduction gear oil seal.

  Conventionally, for example, a sealing device 101 shown in FIG. 2 is known. The sealing device 101 includes a main seal 102 and a foreign matter removing lip 111. The main seal 102 is vulcanized and bonded so as to cover a metal ring 103 having an L-shaped cross section and a cylindrical portion 103a of the metal ring 103. A fixed sealing portion 104, and a main lip 105 vulcanized and bonded to the fixed sealing portion 104 by integral molding to an inner diameter side end portion of a flange portion 103b extending in the inner diameter direction from one end of the cylindrical portion 103a of the metal ring 103; It is composed of a seal lip 107 having a sub lip 106 positioned on the anti-sealing fluid side B from the main lip 105, and an outer diameter side opposite to the lip edge of the main lip 105 is for attaching a garter spring 108. A recess 109 is provided. A cylindrical portion 112a of the reinforcing ring 112 is coupled to an inner diameter side of the metal ring cylindrical portion 103a of the main seal 102 via an inner diameter side fixed sealing portion 104a, and extends from one end of the reinforcing ring cylindrical portion 112a in the inner diameter direction. A foreign matter removal lip 111 that is vulcanized and bonded to the inner diameter side end of the reinforcing ring flange portion 112 b is provided on the sealed fluid side A from the main seal 102.

  The sealing device 101 is disposed between a housing 120 positioned on the outer diameter side of the metal ring 103 and a shaft 121 that is on the inner diameter side of the metal ring 103 and concentric with the housing 120, and Is fitted by the metal ring cylindrical portion 103a via the outer diameter side fixed sealing portion 104b, and each lip edge which is a tip portion of the main lip portion 105, the sub lip 106, and the foreign matter removing lip 111 is attached to the shaft. The garter spring 108 attached to the recess 109 formed on the outer diameter side of the lip edge of the main lip 105 follows the main lip 105 following the movement of the shaft 121 in the radial direction. Press to make.

  As a result, a lubricant such as oil or grease enclosed in the bearing is sealed by the seal lip portion 107 of the main seal 102 so that it does not leak to the anti-bearing side B, and the seal lip portion 107 is damaged by foreign matter. The foreign matter removal lip 111 prevents foreign matter that has flowed out together with the lubricant from entering the seal lip portion 107 so as not to be received.

  However, since the sealing device 101 has a configuration in which the foreign matter removal lip 111 is added to the main seal 102, the material cost for the foreign matter removal lip 111 increases, and the foreign matter removal lip 111 is assembled to the main seal 102 in advance. Therefore, there is a problem that the work process increases.

  As countermeasures, Japanese Utility Model Publication No. 39-3913, Japanese Utility Model Publication No. 37-20204, Japanese Utility Model Publication No. 31-5702 propose to provide a member having a foreign matter removing function on the bearing side. And the configuration of the present invention is different from that of the present invention.

Japanese Utility Model Publication No. 39-3917 Japanese Utility Model Publication No. 37-20204 Japanese Utility Model Publication No. 31-5702

  The present invention has been made in view of the above-mentioned problems, and it is possible to attach a foreign substance removing member by a simple method without assembling a foreign substance removing lip in advance to the main seal, and to prevent foreign substances from entering through a gap in the bearing. An object of the present invention is to provide a sealing device capable of improving the durability of the foreign matter removing member.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention seals an annular gap between two members assembled so as to be movable relative to each other, and is provided integrally with a metal ring. A main seal comprising a fixed sealing portion fitted to a member and a seal lip portion that slides with another member, and the main seal and a bearing positioned on the sealing fluid side, and the seal tip is in sliding contact with the bearing inner ring. And a foreign substance removing member.

  The present invention has the following effects.

  That is, in the sealing device of the present invention having the above-described configuration, the seal tip of the foreign matter removing member is in sliding contact with the inner ring of the bearing, so that foreign matter can be prevented from entering from the gap of the bearing, and the seal lip portion of the main seal is provided. It is possible to improve the durability of the seal lip because it is prevented from being damaged by a foreign material, and the wear resistance of the foreign material removing member can be improved because the seal tip of the foreign material removing member does not slide with the shaft.

  In addition, since the foreign matter removing member is sandwiched between the main seal and the bearing, it is attached to the annular space. Therefore, the foreign matter removing member can be attached together with the main seal in the annular space. The work of assembling the member to the main seal in advance is not required, and the work process can be made more efficient. In addition, the foreign material removing member that is connected to the metal ring of the main seal to be assembled in advance is not necessary. Can be formed of a single member, so that the material cost can be reduced.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not intended to be limited to the contents described in this embodiment unless otherwise specified.

  FIG. 1 shows a cross section of a main part of a sealing device 1 according to the present invention, which is configured as follows. The sealing device 1 includes a main seal 10 and a foreign matter removing member 20. The main seal 10 includes a metal ring 2 composed of a cylindrical portion 2a and a flange portion 2b extending in a radial direction from one end of the cylindrical portion 2a on the anti-sealing fluid side B toward the shaft 11 side. It is composed of an elastic body portion 3 made of a rubber-like elastic body that is vulcanized and bonded so as to cover it. The elastic body part 3 is located on the outer diameter side of the metal ring 2 and is in close contact with the housing 12, the main lip 5 that slides on the shaft 11 on the inner diameter side of the metal ring 2, and the main lip 5. A lip portion 7 having a sub lip 6 positioned on the anti-sealing fluid side B from the lip, and an outer diameter side opposite to the lip edge of the main lip 5 for mounting a garter spring 8 A recess 9 is formed.

  A foreign matter removing member 20 is provided at a position closer to the sealed fluid side A than the main lip 5 and between the bearing 31. The foreign matter removing member 20 is formed of a single material made of resin, the outer diameter surface 21 is in close contact with the housing 12, and the outer diameter portion 22 is sandwiched between the outer ring 33 of the bearing 31 and the fixed sealing portion 4 of the main seal 10. The seal tip 23 is in sliding contact with the inner ring 32 of the bearing 31.

  In the sealing device 1 of the present invention having the above-described configuration, the seal tip 23 of the foreign material removing member 20 is in sliding contact with the inner ring 32 of the bearing 31, thereby preventing foreign material from entering from the gap of the bearing and sealing the main seal. The lip portion can be prevented from being damaged by foreign matter, and the seal tip portion 23 of the foreign matter removing member 20 slides with the inner ring 32 of the bearing 31, so that wear of the foreign matter removing member 20 is suppressed.

  Further, since the foreign matter removing member 20 is sandwiched between the main seal 10 and the bearing 31, it is attached to the annular space. Therefore, when the main seal 10 is attached to the annular space, the foreign matter removing portion 20 can be attached. This eliminates the need to assemble the foreign matter removing member 20 to the main seal 10 in advance, and eliminates the need for the reinforcing ring of the foreign matter removing member 20 to be combined with the metal ring 2 of the main seal 10 for pre-assembly. 20 can be molded in a single piece.

  In addition, as a material of a foreign material removal member, non-vulcanized parts other than resin may be sufficient, and what combined two or more materials may be sufficient.

Partial sectional view of a sealing device according to the present invention Partial sectional view of a sealing device according to a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Metal ring 3 Elastic body part 4 Fixed sealing part 5 Main lip 6 Sub lip 7 Seal lip part 8 Garter spring 9 Recessed part 10 Main seal 11 Shaft 12 Housing 20 Foreign material removal member 21 External surface 22 Outer diameter part 23 Seal tip part 31 Bearing 32 Inner ring 33 Outer ring A Sealing fluid side B Anti-sealing fluid side

Claims (1)

  Seals an annular gap between two members that are assembled so as to be movable relative to each other, and is provided integrally with a metal ring, a fixed sealing portion that fits into one member, and a sealing lip portion that slides with another member And a foreign matter removing member sandwiched between the main seal and a bearing located on the sealing fluid side and having a seal front end slidably contacting the bearing inner ring.

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