LIP SEAL FOR WATER PUMP

• US 20150354706A1
• Filed: 02/17/2014
• Published: 12/10/2015
• Est. Priority Date: 02/18/2013
• Status: Active Grant

• Current Assignee: Eagle Industry Company Limited
• Original Assignee: Eagle Industry Company Limited
• Inventors: Yamanaka, Takuya, Yoshida, Suguru, Kato, Masafumi, Murakami, Hideyuki
• Granted Patent: US 10,139,003 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08K 5/54 Silicon-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08L 15/00 Compositions of rubber derivatives C08L11/00, C08L13/00 take precedence
• CPC Class Codes: C08L 23/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 27/12 containing fluorine atoms
• CPC Class Codes: C09K 2200/0239 Oxides, hydroxides, carbonates
• CPC Class Codes: C09K 2200/0243 Silica-rich compounds, e.g. silicates, cement, glass
• CPC Class Codes: C09K 2200/0282 Carbon fibres
• CPC Class Codes: C09K 2200/0612 Butadiene-acrylonitrile rubber
• CPC Class Codes: C09K 2200/0645 obtained otherwise than by reactions involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09K 3/1006 characterised by the chemical nature of one of its constituents
• CPC Class Codes: C09K 3/1009 Fluorinated polymers, e.g. PTFE
• CPC Class Codes: F04D 29/026 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/10 Shaft sealings
• CPC Class Codes: F04D 29/106 especially adapted for liquid pumps
• CPC Class Codes: F16J 15/102 characterised by material
• CPC Class Codes: F16J 15/3204 with at least one lip
• CPC Class Codes: F16J 15/3284 : characterised by their structure; Selection of materials

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.

Claims

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 μ

m, 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 μ

m 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 rubber-like elastic material is hydrogenated nitrile rubber, EPDM, or fluororubber.

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

4. 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.

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

m.

6. 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.

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

8. 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.

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

m.

10. The lip seal for water pump according to claim 4, wherein the non-reinforcing filler is used in an amount of 5 to 70 parts by weight.

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