公开(公告)号：US20220186807A1

公开(公告)日：2022-06-16

申请号：US17432249

申请日：2020-01-15

Applicant: HITACHI ASTEMO, LTD.

Inventor： Mikio YAMASHITA ,  Ryo SHINATA

IPC: F16F9/516 ,  F16F9/18 ,  F16F9/348 ,  F16F9/512

Abstract: A first damping force generation mechanism provided in a first passage formed in a piston to generate a damping force, and a second damping force generation mechanism provided in an annular valve seat member disposed in one of chambers and provided in a second passage in parallel with the first passage to generate a damping force, in which the second damping force generation mechanism includes a first sub-valve provided on one side of the second passage formed in the valve seat member and a second sub-valve (provided on the other side thereof, and a bottomed cylindrical cap member having an outer cylindrical part and a bottom part, and the cap member includes an inner cylindrical part into which the piston rod is able to be inserted formed on an inner circumferential side of the bottom part and houses at least a part of the second damping force generation mechanism.

公开(公告)号：US20230116767A1

公开(公告)日：2023-04-13

申请号：US17909505

申请日：2021-03-11

Applicant: Hitachi Astemo, Ltd.

Inventor： Yasuhisa OMATA ,  Hideo NAGAYAMA ,  Kosuke TOKUNAGA ,  Ryo SHINATA ,  Reiji NAKAGAWA ,  Shoichiro SOETA

IPC: B24B21/02 ,  F16F9/32

Abstract: This cylinder device of the present aspect includes: a cylinder having a bottomed tubular shape; a seal member provided at an opening of the cylinder; and a piston rod that is provided to protrude from the opening of the cylinder and slides with respect to the seal member. A sliding surface of the piston rod has a chrome-plated layer. In the sliding surface, as characteristic evaluation parameters of a plateau structure surface described in JIS B 0671-2 and ISO 13565-2, a reduced valley depth Rvk is 0.06 μm or more and less than a plating thickness, a reduced peak height Rpk is 0 μm or more and 0.04 μm or less, and a core roughness depth Rk is 0.08 μm or more and 0.16 μm or less.

公开(公告)号：US20240426364A1

公开(公告)日：2024-12-26

申请号：US18689888

申请日：2022-09-16

Applicant: HITACHI ASTEMO, LTD.

Inventor： Rinnosuke ODA ,  Hiroaki TACHIBANA ,  Shingo MIYAKE ,  Sadatomo MATSUMURA ,  Ryo SHINATA

IPC: F16F9/58

Abstract: A cylinder device includes a piston rod having one end side connected to a piston and the other end side inserted through a blocking member, and extending to the outside of a cylinder, and a cushion member provided between the piston and the blocking member and abutting the blocking member through extension of the piston rod. The cushion member has a first member, and a second member provided inside the first member in a radial direction, abutting the blocking member earlier than the first member and having a hardness smaller than that of the first member, and the first member and the second member apply a force to the blocking member in parallel.

公开(公告)号：US20220163087A1

公开(公告)日：2022-05-26

申请号：US17437459

申请日：2020-01-10

Applicant: Hitachi Astemo, Ltd.

Inventor： Mikio YAMASHITA ,  Ryo SHINATA

IPC: F16F9/348 ,  F16F9/06

Abstract: A shock absorber includes a first damping force generation mechanism provided in a first passage, and a second damping force generation mechanism provided in a second passage, in which the second damping force generation mechanism includes a first valve seat formed on a case member having a cylindrical part and a bottom part, a disc valve in which a separable part on an outer circumferential side is separably disposed on a first valve seat, and a second valve seat provided on a side of the disc valve opposite to the first valve seat and configured to support the disc valve on a radial inner side of the separable part, and the second passage includes a piston rod passage part formed by cutting out or penetrating the piston rod, and a chamber passage part which allows communication from the piston rod passage part to a case inner chamber.