Bearing with dynamic pressure grooves and method for manufacturing the same
Patent 5129739 Issued on July 14, 1992. Estimated Expiration Date: 
December 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3464845 Bearing element Roll-formed bushing for sliding surface bearings Method of manufacturing a dynamic pressure type slide bearing Patent #: 4875263 InventorsAssigneeApplicationNo. 807421 filed on 12/13/1991US Classes:384/292, Helical or herring bone384/300, Polytetrafluorethylene (e.g., Teflon*)384/907.1, Jewel, glass, ceramic or carbon384/909, Plastic384/911, Including fiber384/913Metallic compoundsExaminersPrimary: Footland, Lenard A.Attorney, Agent or FirmInternational ClassF16C 033/20Foreign Application Priority Data1989-08-09 JPAbstractA bearing with dynamic pressure grooves includes an outer cylinder made of a metal and a resin sheet bonded to the inner peripheral surface of the outer cylinder. The resin sheet is made of a thermoplastic resin, for example, a polytetra fluoroethylene, as a main component mixed with a wear-resistant improving material, for example, graphite or the like. The resin sheet is formed with a pattern of dynamic pressure generating grooves formed in an inner surface by plastic work. The pattern of grooves is varied depending on the types of relative movement between the outer cylinder and a shaft body, i.e., whether an axial linear movement, a rotational movement, or a spiral movement. | |
