公开(公告)号：US11628815B2

公开(公告)日：2023-04-18

申请号：US16766988

申请日：2018-12-04

Applicant: ADVICS CO., LTD.

Inventor： Hongding Li

IPC: B60T8/40 ,  B60T13/14 ,  B60T13/68

Abstract: The present invention comprises: a piston provided in a cylinder hole; a lid member which closes an opening on the other side of the cylinder hole; and elastic members and which are provided between the piston and the lid member. The elastic members and comprise a first elastic member provided on the piston side of the cylinder hole, and a second elastic member provided on the lid member side of the cylinder hole. The second elastic member has a base portion provided in line with the first elastic member, and a protruding portion protruding from the piston side end surface of the base portion. When the piston has moved in the axial direction to the lid member side, the protruding portion touches the piston, undergoing compressive deformation, and the base portion subsequently undergoes compressive deformation.