公开(公告)号：US20200324749A1

公开(公告)日：2020-10-15

申请号：US16766988

申请日：2018-12-04

Applicant: ADVICS CO., LTD.

Inventor： Hongding LI

IPC: B60T8/40

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 22-side end surface of the base portion. When the piston has moved in the axial direction to the lid member 23-side, the protruding portion touches the piston, undergoing compressive deformation, and the base portion subsequently undergoes compressive deformation.