公开(公告)号：US20220126406A1

公开(公告)日：2022-04-28

申请号：US17434021

申请日：2020-01-15

Applicant: HITACHI ASTEMO, LTD.

Inventor： Shimpei TODA ,  Ryuichi YAMANAKA ,  Michinori NAKAYAMA ,  Daimu INOUE

IPC: B23P15/10

Abstract: A production method for a cylinder device includes a first liquid injection step of injecting a first predetermined amount of working fluid L into the inner cylinder, a first piston rod insertion step of inserting an assembly between the piston rod and the piston into the inner cylinder to dispose the piston at a predetermined position inside the inner cylinder, a second liquid injection step of injecting a second predetermined amount of the working fluid into an upper side of the piston inside the inner cylinder, and a closing step of closing the opening of the outer cylinder with the closing member.