Patent ID: 6193820
Filing Date: 2001-02-27
Classification: B62D,C21D,F16C

Abstract:
A method for heat treatment of a bushing used in an endless track mounted to vehicles and having an outer surface and an inner surface and a thickness extending between said outer and inner surfaces, the method comprising the steps of:a) external quench hardening performed on said bushing by heating, starting from the outer surface of the bushing, through to a depth of about 7/10 to 10/10 of the thickness of said bushing and quenching with a cooling liquid;b) internal quench hardening performed on said bushing by heating, starting from the inner surface of the bushing, through to a depth of about 4/10 to 7/10 of the thickness of said bushing and quenching with a cooling liquid;c) stress relieving of said bushing performed on said bushing in which said bushing is heated, and the steps a and b being performable in different sequences.