公开(公告)号：US09328792B2

公开(公告)日：2016-05-03

申请号：US14605016

申请日：2015-01-26

Applicant: Showa Corporation

Inventor： Masatoshi Ohta

IPC: F16F9/00 ,  F16F9/44 ,  F16F9/34

CPC classification number: F16F9/44 ,  F16F9/3405 ,  F16F9/461

Abstract: A hydraulic shock absorber includes a damping force generation unit and a damping force adjustment unit. The damping force adjustment unit includes a push rod that changes an opening area of an oil path formed in a piston rod, an electric motor functioning as a driving source, and a feed screw mechanism that converts rotation of the electric motor into linear movement of the push rod. The feed screw mechanism includes a first slider that is screwed to an output shaft of the electric motor in an advanceable/retractable manner, a second slider is fitted movably to the first slider, and a set spring that pushes the second slider against one end of the push rod.