公开(公告)号：US20220099153A1

公开(公告)日：2022-03-31

申请号：US17423330

申请日：2020-01-10

Applicant: Hitachi Astemo, Ltd.

Inventor： Osamu YUNO ,  Takao NAKADATE ,  Shunsuke MORI ,  Yu ISHIMARU

IPC: F16F9/348 ,  F16F9/46

Abstract: Provided is a shock absorber in which a check valve seated on a seat portion (second seat portion) having an annular shape is quickly opened during a reverse stroke. As a result, a working fluid in a chamber on a downstream side can be quickly introduced into a back-pressure chamber. Hence, a delay in response of a damping force, which may be caused by sticking of the check valve to a relief valve, can be suppressed.

公开(公告)号：US20240318701A1

公开(公告)日：2024-09-26

申请号：US18574518

申请日：2022-07-22

Applicant: Hitachi Astemo, Ltd.

Inventor： Masato HIGUMA ,  Atsushi KOSHIZAKA ,  Keiji KAWAHARA ,  Yu ISHIMARU

IPC: F16F9/32 ,  F16F9/19

CPC classification number: F16F9/3228 ,  F16F9/19 ,  F16F9/3271 ,  F16F9/3221 ,  F16F2222/12 ,  F16F2226/045 ,  F16F2230/0005

Abstract: A first annular groove is filled with a material of a solenoid case and a first joined portion is formed after a second annular groove is filled with the material of the solenoid case and a second joined portion is formed. This allows a load applied to a piston rod when the material of the solenoid case flows into the first annular groove to be partially received by the second joined portion, thereby contributing to reducing a reaction force received by the piston rod and thus preventing the deformation of an upper-end portion of the piston rod due to the reaction force received by the piston rod.