公开(公告)号：US20220196065A1

公开(公告)日：2022-06-23

申请号：US17441933

申请日：2020-03-19

Applicant: NSK LTD.

Inventor： Masaki CHISHIMA ,  Hiroaki YAMANAKA ,  Hiroyuki OHSHIMA

IPC: F16C19/36 ,  F16C33/36

Abstract: In a tapered roller bearing (10), the surface roughness of at least a rolling surface (13c) and a large diameter-side end surface (13b) of a tapered roller (13) is 0.02 to 0.17 μm in reduced peak height Rpk, 0.12 to 0.21 μm in core roughness depth Rk, and 0.07 to 0.43 μm in reduced valley depth Rvk and the average recessed portion area in the fine irregularities on the surface of the tapered roller (13) is 5 μm2 or less. As a result, oil film formability can be improved under dilute lubrication and a decline in lubricating oil viscosity and surface damage at a rolling contact part and an increase in friction at a sliding contact part can be suppressed at the same time.