Non-carburized components of track-type machines having a metallurgically bonded coating

Patent metadata

Field	Value
Publication number	US-9623921-B2
Application number	US-201314134381-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Mar 6, 2002
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

Undercarriage assembly components of track-type machines having a metallurgically bonded wear-resistant coating and methods for forming such coated undercarriage assembly components is taught herein. The bodies of the undercarriage assembly components, formed of an iron-based alloy, have a hard metal alloy slurry disposed on a surface or into an undercut or channel and then fused to form a metallurgical bond with the iron-based alloy. 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 of the undercarriage assembly components having the wear-resistant coating corresponds to a wear surface of the component during operation of the endless track of the track-type vehicle.

First claim

What is claimed is:

1. A pin bushing joint of an endless track of a track-type machine, the pin bushing joint comprising:
a bushing including an outer surface having an outer diameter and including an inner surface having an inner diameter; and
a track pin including an outer surface,

wherein a portion of the outer surface of the track pin substantially conforms to a portion of the inner surface of the bushing to form a wear surface,
wherein one or both of the bushing and the track pin comprise non-carburized, hardened steel
wherein the wear surface has a metallurgically bonded, wear-resistant coating, the wear-resistant coating comprising a fused metal alloy comprising at least 60% by weight iron, cobalt, nickel or alloys thereof, and
wherein the wear-resistant coating has a Vickers hardness greater than 950 HV.

2. The pin bushing joint of claim 1 , wherein the bushing and the track pin are formed of a hardened medium carbon steel.

3. The pin bushing joint of claim 2 , wherein the hardened steel is induction hardened.

4. The pin bushing joint of claim 1 , wherein an outer surface of the wear-resistant coating is flush with the outer surface of the track pin, and wherein the hardness of steel beneath the coating is 55-60 HRC.

5. The pin bushing joint of claim 1 , wherein an outer surface of the wear-resistant coating is flush with the inner surface of the bushing, and wherein the hardness of steel beneath the coating is 55-60 HRC.

6. The pin bushing joint of claim 1 , wherein the wear-resistant coating has a thickness of 1.5 mm.

7. The pin bushing joint of claim 1 , wherein at least a portion of the outer surface of the bushing has a metallurgically bonded, wear-resistant coating, the wear-resistant coating comprising a fused metal alloy comprising at least 60% by weight iron, cobalt, nickel or alloys thereof.

Assignees

• Deere & Co

Inventors

• Wodrich Timothy D

Classifications

• B62D55/12

  Arrangement, location, or adaptation of driving sprockets · CPC title

• B62D55/15

  Mounting devices, e.g. bushings, axles, bearings, sealings {(with lubrication means B62D55/092)} · CPC title

• B62D55/202

  Wheel engaging parts; Wheel guides on links · CPC title

• B62D55/20

  of articulated type, e.g. chains {(with lubrication means B62D55/092)} · CPC title

• Y10T29/49885

  with coating before or during assembling · CPC title