Vehicle transmission oil seal

Patent metadata

Field	Value
Publication number	US-9322477-B2
Application number	US-201113575216-A
Country	US
Kind code	B2
Filing date	Mar 4, 2011
Priority date	Mar 8, 2010
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

The present invention provides a vehicle transmission having excellent sliding properties over the entire speed range of engines from a low speed range to a high speed range. The present invention is a vehicle transmission oil seal comprising: an elastic member with a seal lip portion having at least a main lip portion, wherein the elastic member is formed of a composition containing a fluororubber and a fluororesin and has projecting portions at least on a surface of the main lip portion, the projecting portions being substantially formed of the fluororesin contained in the composition, the fluororesin is a copolymer including a polymerization unit derived from ethylene and a polymerization unit derived from tetrafluoroethylene, and the fluororubber is a polymer including a polymerization unit derived from vinylidene fluoride.

First claim

The invention claimed is:

1. A vehicle transmission oil seal comprising:
an elastic member with a seal lip portion having at least a main lip portion,
wherein the elastic member is formed of a composition containing a fluororubber and a fluororesin and has projecting portions at least on a surface of the main lip portion, the projecting portions being substantially formed of the fluororesin contained in the composition and having an average diameter of 5 to 20 μm,
the fluororesin is a copolymer including a polymerization unit derived from ethylene and a polymerization unit derived from tetrafluoroethylene and has a melting point of 120° C. to 340° C.,
the fluororubber is a polymer including a polymerization unit derived from vinylidene fluoride, and
a ratio (P IR0.5 1/P IR0.5 2) of a characteristic absorption peak (P IR0.5 1) by IR analysis derived from the fluororubber at a depth of 0.5 μm from the surface of the main lip portion to a peak (P IR0.5 2) derived from the fluororesin at the depth of 0.5 μm is smaller than a ratio (P IR1.2 1/P IR1.2 2) at a depth of 1.2 μm.

2. The vehicle transmission oil seal according to claim 1 ,
wherein the fluororubber is a copolymer including:
a polymerization unit derived from vinylidene fluoride; and
a polymerization unit derived from at least one monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, and perfluoro(alkyl vinyl ether).

3. The vehicle transmission oil seal according to claim 2 ,
wherein the composition has a mass ratio of the fluororubber to the fluororesin of 60/40 to 97/3.

4. The vehicle transmission oil seal according to claim 2 ,
wherein the projecting portions has an average height of 0.5 to 5 μm.

5. The vehicle transmission oil seal according to claim 2 ,
wherein the proportion of an area of the projecting portions on the surface of the main lip portion is not less than 10%.

6. The vehicle transmission oil seal according to claim 1 ,
wherein the composition has a mass ratio of the fluororubber to the fluororesin of 60/40 to 97/3.

7. The vehicle transmission oil seal according to claim 6 ,
wherein the projecting portions has an average height of 0.5 to 5 μm.

8. The vehicle transmission oil seal according to claim 6 ,
wherein the proportion of an area of the projecting portions on the surface of the main lip portion is not less than 10%.

9. The vehicle transmission oil seal according to claim 1 ,
wherein the projecting portions has an average height of 0.5 to 5 μm.

10. The vehicle transmission oil seal according to claim 9 ,
wherein the proportion of an area of the projecting portions on the surface of the main lip portion is not less than 10%.

11. The vehicle transmission oil seal according to claim 1 ,
wherein the proportion of an area of the projecting portions on the surface of the main lip portion is not less than 10%.

12. The vehicle transmission oil seal according to claim 1 , wherein the diameter of the projecting portions is defined in a plane parallel with the surface of the main lip portion.

Assignees

• Ogishi Hidetaka
• Mizone Tetsuya
• Takemura Kouhei
• Yanagiguchi Tomihiko
• Honda Motor Co Ltd
• Daikin Ind Ltd

Inventors

• Ogishi Hidetaka
• Mizone Tetsuya
• Takemura Kouhei
• Yanagiguchi Tomihiko

Classifications

• C09K3/1009

  Fluorinated polymers, e.g. PTFE · CPC title

• F16J15/3284 Primary

  characterised by their structure; Selection of materials · CPC title