公开(公告)号：US20210054877A1

公开(公告)日：2021-02-25

申请号：US16979041

申请日：2019-03-08

Applicant: NSK LTD.

Inventor： Makoto ZEMBUTSU ,  Hiroaki YAMANAKA ,  Tomoyuki MIYAZAKI ,  Hiroki MAEJIMA

IPC: F16C19/36 ,  F16C33/46 ,  F16C33/10

Abstract: A holder of a tapered roller bearing is made of a resin, has a first gap between an axially inner end surface of a small-diameter-side annular part and small-diameter-side end surfaces of tapered rollers, has a second gap between an axially inner end surface of a large-diameter-side annular part and large-diameter-side end surfaces of the tapered rollers, and is provided to be capable of moving within a prescribed range along the axial direction. The surface of the axially inner end surface of the large-diameter-side annular part is rough, the large-diameter-side annular part is provided with one or more grooves which are oil-holding parts that hold the lubricating oil, and ends of the grooves are positioned to be capable of coming into contact with the tapered rollers.

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.