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Low-friction sliding member in transmission, and transmission oil therefor

  • US 7,318,514 B2
  • Filed: 08/19/2004
  • Issued: 01/15/2008
  • Est. Priority Date: 08/22/2003
  • Status: Active Grant
First Claim
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1. A low-friction sliding member in a transmission, the sliding member being at least one of a plurality of sliding members which are in slidable contact with each other in the presence of a transmission oil composition, the low-friction sliding member comprising:

  • a base material having a sliding section; and

    a hard carbon thin film coated at a sliding surface of the sliding section of the base material, the hard carbon thin film containing hydrogen in an amount not more than 20 atomic %,wherein the transmission oil composition comprises at least one organic oxygen-containing compound selected from the group consisting of a monohydric alcohol, a polyhydric alcohol, a carboxylic acid, an ether, a derivative of a monohydric alcohol, a derivative of a polyhydric alcohol, a derivative of a carboxylic acid, a derivative of an ether, a derivative of an ester, the organic oxygen-containing compound being contained in an amount ranging from 0.05 to 3.0% based on total amount of the transmission oil composition, andwherein the transmission comprises a continuously variable transmission.

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