公开(公告)号：US20200072338A1

公开(公告)日：2020-03-05

申请号：US16493111

申请日：2017-04-10

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Shunichi TEZUKA ,  Yoshihide KIYOSAWA ,  Toshimi YAMAGISHI

IPC: F16H57/04 ,  F16H1/32 ,  F16H49/00 ,  F01D25/16 ,  F01D25/18 ,  F16C33/10

Abstract: A silk hat-type strain wave gear device has a crossed roller bearing for supporting an internal gear and an external gear so as to allow relative rotation. A first gap part between the inner and outer rings of said bearing is sealed by an oil seal and a second gap part thereof is in communication with a gear-side gap part on the outside of the external gear. A bearing seal separates the second gap part from the gear-side gap part. The bearing seal prevents excessive inflow of lubricant from the gear-side gap part into the second gap part. Excess lubricant that has flowed into the bearing can flow back from the second gap part to the gear-side gap part. Excess lubricant in the bearing is prevented from leaking through the oil seal to the outside.