公开(公告)号：US20250100339A1

公开(公告)日：2025-03-27

申请号：US18730535

申请日：2023-01-05

Applicant: Hitachi Astemo, Ltd.

Inventor： Kosuke TOKUNAGA ,  Hirohito ISHII ,  Yutaka KURODA

IPC: B60G13/00

Abstract: Provided are a shock absorber and a bracket which are improved in attachment rigidity. A cylindrical portion is shaped by press-forming first and second holes in sheet material (flat plate) and then curving the sheet material into a tube, in which a bridge portion is formed between the first and second holes. The bracket is thus improved to have higher formability as compared to conventional brackets which are not provided with a bridge portion. This improves the accuracy (cylindricity, in particular) of the cylindrical portion. It is then possible to improve the shock absorber in attachment rigidity against a lateral force to the anteroposterior direction of a vehicle in a situation where the bracket is used to attach the shock absorber to the knuckle.

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.