公开(公告)号：US12241488B1

公开(公告)日：2025-03-04

申请号：US18584327

申请日：2024-02-22

Applicant: Hitachi Astemo, Ltd.

Inventor： Andrew Feldkamp

IPC: F15B15/22 ,  F16J1/00 ,  F16J9/12

Abstract: The cylinder device includes a first piston fitted in a first cylinder to be slidable, a piston rod connected to the first piston, and a stopper mechanism which operates when the first piston reaches a predetermined position on a first end portion side of one axial end of the first cylinder during an extension stroke or a compression stroke, in which the stopper mechanism includes a second cylinder provided on the first end portion side of the first cylinder and a second piston provided to be movable according to movement of the piston rod and able to fit into the second cylinder, and one end of the second piston on the first end portion side comes into contact with a rod flange part between a rod first outer diameter part of the piston rod and a rod second outer diameter part.

公开(公告)号：US20240360885A1

公开(公告)日：2024-10-31

申请号：US18139969

申请日：2023-04-27

Applicant: Hitachi Astemo, Ltd.

Inventor： Markus STEEB ,  Shivanand SANKARAN ,  Andrew Feldkamp

IPC: F16F9/348

CPC classification number: F16F9/3484 ,  F16F9/3481 ,  F16F2222/126

Abstract: This shock absorber includes a cylinder having an inner chamber; a cage body partitioning the inner chamber into first and second chambers, and includes a first passage allowing communication between the first and second chambers, a first seat part, a second passage allowing communication between the first and second chambers, and a second seat part. A first valve which is a first valve coming into contact with the first seat part to close the first passage and being separated from the first seat part to open the first passage, and in which a communication hole communicating with the second passage is formed. A second valve comes into contact with the second seat part to close the second passage and is separated from the second seat part to open the second passage. A passage adjusting disc is provided between the first valve and the cage body.