Lip seal for water pump

Patent metadata

Field	Value
Publication number	US-10139003-B2
Application number	US-201414439988-A
Country	US
Kind code	B2
Filing date	Feb 17, 2014
Priority date	Feb 18, 2013
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

Disclosed is a lip seal for water pump made of a rubber-like elastic material, fixed to a housing as a fixed side and in sliding contact with a shaft rotating relative to the housing; the lip seal having sliding surface with a surface roughness Ra (according to JIS B0601 corresponding to ISO 4287) of 1 to 30 μm, being obtained by vulcanization-molding of a rubber composition comprising 100 parts by weight of the rubber-like elastic material, 1 to 150 parts by weight of a reinforcing filler, 5 to 90 parts by weight of a non-reinforcing filler having an average particle diameter of 1 μm or more, 0.1 to 5 parts by weight of a coupling agent, 1 to 15 parts by weight of a co-crosslinking agent, and 0.5 to 10 parts by weight of an organic peroxide. The lip seal effects to prevent softening and volume swelling of the rubber-like elastic material and furthermore the generation of deposits in the rotating shaft, which are problematic for rotation torque and LLC resistance.

First claim

The invention claimed is:

1. A lip seal for water pump made of a rubber-like elastic material, fixed to a housing as a fixed side and in sliding contact with a shaft rotating relative to the housing;
the lip seal having sliding surface with a surface roughness Ra (according to JIS B0601 corresponding to ISO 4287) of 1 to 30 μm, being obtained by vulcanization-molding of a rubber composition comprising 100 parts by weight of hydrogenated nitrile rubber or EPDM, 1 to 150 parts by weight of a reinforcing filler, 5 to 90 parts by weight of a non-reinforcing filler having an average particle diameter of 1 μm or more, 0.1 to 5 parts by weight of a coupling agent, 1 to 15 parts by weight of a co-crosslinking agent, and 0.5 to 10 parts by weight of an organic peroxide.

2. The lip seal for water pump according to claim 1 , wherein the hydrogenated nitrile rubber is a hydrogenated nitrile rubber that does not have a terminal functional group.

3. The lip seal for water pump according to claim 1 , wherein the non-reinforcing filler is at least one member selected from a group consisting of aluminum silicate, magnesium silicate, calcium silicate, carbon fiber, iron oxide, titanium oxide, and diatomaceous earth.

4. The lip seal for water pump according to claim 1 , wherein the non-reinforcing filler has an average particle diameter of 1 to 40 μm.

5. The lip seal for water pump according to claim 1 , wherein the non-reinforcing filler is used in an amount of 5 to 70 parts by weight.

6. The lip seal for water pump according to claim 1 , wherein the reinforcing filler is carbon black or silica.

7. The lip seal for water pump according to claim 1 , wherein the reinforcing filler is used in an amount of 30 to 70 parts by weight.

8. The lip seal for water pump according to claim 3 , wherein the non-reinforcing filler has an average particle diameter of 1 to 40 μm.

9. The lip seal for water pump according to claim 3 , wherein the non-reinforcing filler is used in an amount of 5 to 70 parts by weight.

10. The lip seal for water pump according to claim 6 , wherein the reinforcing filler is used in an amount of 30 to 70 parts by weight.

Assignees

• Eagle Ind Co Ltd

Inventors

• Yamanaka Takuya
• Yoshida Suguru
• Kato Masafumi
• Murakami Hideyuki

Classifications

• C09K2200/0645

  obtained otherwise than by reactions involving carbon-to-carbon unsaturated bonds · CPC title

• F04D29/106

  especially adapted for liquid pumps · CPC title

• F16J15/102

  characterised by material · CPC title

• C08K5/54

  Silicon-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• C08K3/36

  Silica · CPC title