Track pin bushing having a metallurgically bonded coating

Details Track pin bushing having a metallurgically bonded coating Track pin bushing having a metallurgically bonded coating

2005-09-27

2005-09-27

Stormer, Russell D. (Department: 3617)

Wheel substitutes for land vehicles

Tracks or treads

Separate transverse connector pin between treads

C305S194000, C029S898130, C384S276000, C384S282000

Reexamination Certificate

active

06948784

ABSTRACT:
A track pin bushing for cooperating with a track pin in an endless track has a tubular body with a metallurgically bonded wear-resistant coating and a method for forming such a coated track pin bushing is taught herein. The tubular body, formed of an iron-based alloy, has an outer surface that is carburized and quenched, i.e., case-hardened, in at least a section thereof. At least a portion of the case hardened section has been removed to a depth sufficient to expose a non-carburized layer of the iron-based alloy. A hard metal alloy slurry is disposed on the non-carburized layer and forms a metallurgical bond between the non-carburized layer and the coated unfused slurry by fusing the hard metal alloy. The thickness of the unfused slurry is adjusted to be from 1.67 to 2.0 times a final thickness of the wear-resistant coating. The wear-resistant coating comprises a fused, metal alloy comprising at least 60% iron, cobalt, nickel, or alloys thereof. The portion of the outer surface with the wear-resistant coating corresponds to a contact surface adapted to engage with a drive sprocket in the endless track of the track-type vehicle.

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Patent Abstracts of Japan, vol. 2000, No. 15, Apr. 6, 2001, JP 2000 343129 A.

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