US 12,103,612 B2
Roller unit of crawler travel unit, crawler travel unit, and work machine
Masahiko Taniguchi, Tokyo (JP); Noriyuki Kitai, Tokyo (JP); and Kazuo Maeda, Tokyo (JP)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 17/418,996
Filed by KOMATSU LTD., Tokyo (JP)
PCT Filed Apr. 8, 2020, PCT No. PCT/JP2020/015817
§ 371(c)(1), (2) Date Jun. 28, 2021,
PCT Pub. No. WO2020/217993, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-084399 (JP), filed on Apr. 25, 2019.
Prior Publication US 2022/0097784 A1, Mar. 31, 2022
Int. Cl. B62D 55/15 (2006.01); B62D 55/088 (2006.01); B62D 55/06 (2006.01)
CPC B62D 55/15 (2013.01) [B62D 55/088 (2013.01); B62D 55/06 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A roller unit of a crawler travel unit, the roller unit comprising:
a shaft having an outer circumferential surface provided with a recessed portion in which a cooling medium is accommodated;
a roller that is rotatable relative to the outer circumferential surface of the shaft;
a first sliding bearing that supports the roller to be rotatable relative to the outer circumferential surface of the shaft, and receives force in a radial direction of the shaft; and
a floating seal including a rotating-side member that is supported by the roller and a fixed-side member that slides together with the rotating-side member, wherein
in the radial direction of the shaft, the recessed portion faces: a sliding portion between the rotating-side member and the fixed-side member in the floating seal; and the first sliding bearing,
the shaft includes an intermediate flange protruding outward in the radial direction,
the roller unit further comprises a second sliding bearing that supports the roller to be rotatable relative to the intermediate flange and receives force in an axial direction of the shaft, and
the recessed portion faces the second sliding bearing in the radial direction of the shaft.