Roller follower hydraulic tappet
Roller follower axle retention
Roller rocker arm
Tappet with ceramic camface
Method of making low friction finger follower rocker arms Patent #: 4872429
ApplicationNo. 543645 filed on 06/26/1990
US Classes:123/90.5, Rotation prevention74/519, Levers74/559, Rocker arms123/90.39, Rocker123/90.51Composition, surface treatment manufacture
ExaminersPrimary: Okonsky, David A.
Assistant: Lo, Weilun
Attorney, Agent or Firm
Foreign Patent References
International ClassF01L 001/18
Foreign Application Priority Data1989-06-29 JP
AbstractA cam follower device which is incorporated in a valve driving mechanism for an engine to contact the outer peripheral surface of a cam secured to a cam shaft that rotates synchronously with a crankshaft of the engine, thereby transmitting the motion of the cam to a valve that opens and closes a suction port or an exhaust port in the enigne. A ring-shaped member which contacts the cam is formed from a ceramic material, and this ceramic ring-shaped member is rotatably supported around a steel shaft. The clearance between the inner peripheral surface of the ceramic ring-shaped member and the steel shaft is set within a specific range, thereby preventing the occurrence of problems, for example, noise, arising due to a difference in thermal expansion coefficient between the two members and thus improving the high-speed follow-up performance of the cam follower device.