VALVE LIFTER MADE FROM TITANIUM ALLOY FOR ENGINE, AND METHOD FOR MANUFACTURING SAME

摘要

PROBLEM TO BE SOLVED: To provide a lightweight high strength valve lifter made of titanium alloy having excellent sliding characteristics for an engine.;SOLUTION: The valve lifter 16 includes a cylindrical part 19 and an end wall shape part 20, and includes a valve lifter main body 21 made of titanium alloy, a first hardened layer 23 formed on an outer surface of the end wall shape part 20 to form a sliding surface sliding on a valve gear cam, and a second hardened layer 25 formed on an outer circumference surface of the cylindrical part 19 to form a sliding surface sliding in a guiding hole of an engine main body. Vickers hardness H₁ of the first hardened layer 23 is 500 HV0.1H₁≤800 HV0.1. Vickers hardness H₂ of the second hardened layer 25 is 300 HV0.1≤H₂≤500 HV0.1.;COPYRIGHT: (C)2006,JPO&NCIPI