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：US20240191768A1

公开(公告)日：2024-06-13

申请号：US18282051

申请日：2022-03-04

Applicant: Hitachi Astemo, Ltd.

Inventor： Hirohito ISHII ,  Osamu YUNO

IPC: F16F9/18 ,  F16F9/34 ,  F16F9/512

CPC classification number: F16F9/18 ,  F16F9/34 ,  F16F9/5126

Abstract: The invention is directed to provide a shock absorber in which hydraulic fluid is restrained from leaking out from a gap between a sub-check valve provided at a passage opening of an orifice passage and a disc valve. The sub-check valve (133) is biased toward the opening (126) of the orifice passage (130) using a biasing disc (135) (biasing member) of substantially equal diameter to the sub-check valve (133). This makes it possible to restrain hydraulic fluid in a first chamber (2A) from leaking out from a gap between a disc valve (121) and the sub-check valve (133) into a second chamber (2B) when piston velocity during an extension stroke is low (0.1 m/s or lower, exclusive zero), and thus obtain an intended damping force.

公开(公告)号：US20230296158A1

公开(公告)日：2023-09-21

申请号：US18023174

申请日：2021-09-13

Applicant: Hitachi Astemo, Ltd.

Inventor： Hirohito ISHII ,  Takao NAKADATE ,  Osamu YUNO ,  Yuta YAMAGUCHI

IPC: F16F9/516 ,  F16F9/348 ,  F16F9/19

CPC classification number: F16F9/516 ,  F16F9/348 ,  F16F9/19 ,  F16F2222/12 ,  F16F2232/08 ,  F16F2234/02 ,  F16F2228/066

Abstract: A shock absorber is configured in such a manner that a flow passage area of each of first orifices 169 and 189 is smallest throughout a communication passage that establishes communication between a chamber 2A or 2B on an upstream side and a chamber 2B or 2A on a downstream side, and therefore prevents a pressure in a back-pressure chamber 55 or 26 from excessively increasing. As a result, the shock absorber can prevent overshoot of a damping force due to a delay of valve opening of a main valve 53 or 23 due to a remaining pressure in the back-pressure chamber 55 or 26 when a movement of a piston 3 is switched from one direction to an opposite direction.