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Hydraulic motors and pumps with engineered surfaces

  • US 6,895,855 B2
  • Filed: 09/16/2002
  • Issued: 05/24/2005
  • Est. Priority Date: 10/01/2001
  • Status: Expired due to Fees
First Claim
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1. A method of increasing the torque rating and machine life for a hydraulic motor or pump having both rolling and sliding contact surfaces comprising the steps of applying predetermined engineered surface treatments to both said rolling and said sliding contact surfaces in said hydraulic motor or pump, the engineered surface treatments comprising both texture modifications and tribological coatings, the texture modifications being selected from mechanical vibratory finishing, chemical-mechanical vibratory finishing, laser texturing, and mechanical dimpling and the tribological coatings being selected from the group consisting of doped amorphous carbons, undoped amorphous carbons, amorphous hydrocarbons, metal carbides, metal nitrides, metal oxides, metal dichalcogenides, and metal borides.

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