US 11,654,983 B2
Rotatable element in machine track having thrust washer stack for stepping down relative speeds
Benoit Abello, Dunlap, IL (US); Paul Palthey-Glomeau, Peoria, IL (US); Brian Loeffler, Germantown Hills, IL (US); and David Jennings Hakes, Princeville, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Deerfield, IL (US)
Filed on Jun. 10, 2019, as Appl. No. 16/436,209.
Prior Publication US 2020/0386271 A1, Dec. 10, 2020
Int. Cl. B62D 55/15 (2006.01); F16C 17/04 (2006.01); F16C 33/12 (2006.01); F16C 33/76 (2006.01); B62D 55/14 (2006.01)
CPC B62D 55/15 (2013.01) [B62D 55/14 (2013.01); F16C 17/045 (2013.01); F16C 33/122 (2013.01); F16C 33/761 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An undercarriage assembly comprising:
a roller having a bore formed therein defining a major axis;
a roller shaft extending through the bore to support the roller for rotation about the major axis;
a seal cavity extending between the roller and the roller shaft and formed in part by a first thrust surface that faces a first axial direction and is fixed relative to the roller, and a second thrust surface that faces a second axial direction opposite to the first axial direction and is fixed relative to the roller shaft;
a thrust washer stack trapped between the first thrust surface and the second thrust surface, to react thrust loads between the roller and the roller shaft, and including a first thrust washer in contact with the first thrust surface and rotatable at a first fractional speed of a speed of rotation of the roller, and a second thrust washer in contact with the second thrust surface and rotatable at a second fractional speed of rotation of the roller different from the first fractional speed of rotation; and
a dynamic seal fluidly sealing the thrust washer stack within the seal cavity.