Patent ID: 7282173

Claim:
A track bushing producing apparatus for producing a track bushing having an inner circumferential surface defining a longitudinally-extending centrally-disposed hole with an inside diameter and an outer circumferential surface, comprising: a quenching system capable of induction heating the track bushing material from its outer circumferential surface, wherein the quenching system has an inner circumferential surface cooling system including a tubular or cylindrical body which has an outside diameter smaller than the inside diameter of the track bushing and which is disposed inside the hole of the inner circumferential surface of the track bushing, and the inner circumferential surface cooling system has a diverting member located at the upper end of the track bushing to divert a flowing direction of a cooling medium such that the cooling medium flows in a first anti-gravitational direction along an inner circumferential surface of the tubular or cylindrical body, then flows in a second gravitational direction within a space defined by the inner circumferential surface of the track bushing and an outer circumferential surface of the tubular or cylindrical body while rotating the track bushing to cool the inner circumferential surface of the track bushing by a laminar flow.