公开(公告)号：US20240218889A1

公开(公告)日：2024-07-04

申请号：US18292429

申请日：2022-04-25

Applicant: KYB Corporation

Inventor： Tatsuya ITOU ,  Nobuyuki KOBAYASHI ,  Hirotaka KOBAYASHI

IPC: F15B20/00 ,  F16J1/12

CPC classification number: F15B20/00 ,  F16J1/12

Abstract: A hydraulic cylinder includes: a cylinder tube; a piston rod; a piston member; a rod inner passage provided within the piston rod, a rod inner passage being configured such that a first opening portion opens at an outer circumferential surface of the piston rod in the cylinder tube, and such that a second opening portion opens outside the cylinder tube; and a sensor part provided outside the cylinder tube, the sensor part being configured to detect that the working fluid is guided to the rod inner passage, the piston member is connected to the piston rod in a state in which one-side end surface is in contact with an annular step portion so as to block the first opening portion of the rod inner passage, the annular step portion being provided on the outer circumferential surface of the piston rod, and the sensor part is configured to detect that the working fluid is guided to the rod inner passage from a rod side chamber and a counter rod side chamber through a gap between the step portion and the piston member.