公开(公告)号：EP3611399A1

公开(公告)日：2020-02-19

申请号：EP17905051.3

申请日：2017-04-10

Applicant: Harmonic Drive Systems Inc.

Inventor： TEZUKA, Shunichi ,  KIYOSAWA, Yoshihide ,  YAMAGISHI, Toshimi

IPC: F16H1/32

Abstract: A silk hat-type strain wave gear device (1) has a crossed roller bearing (5) for supporting an internal gear (2) and an external gear (3) so as to allow relative rotation. A first gap part (54) between the inner and outer rings of said bearing is sealed by an oil seal (6) and a second gap part (55) thereof is in communication with a gear-side gap part (8) on the outside of the external gear (3). A bearing seal (9) separates the second gap part (55) from the gear-side gap part (8). The bearing seal (9) prevents excessive inflow of lubricant from the gear-side gap part (8) into the second gap part (55). Excess lubricant that has flowed into the bearing can flow back from the second gap part (55) to the gear-side gap part (8). Excess lubricant in the bearing is prevented from leaking through the oil seal (6) to the outside.