公开(公告)号：US20220347787A1

公开(公告)日：2022-11-03

申请号：US17762151

申请日：2020-08-26

Applicant: Hitachi Astemo, Ltd.

Inventor： Yasuhisa OMATA

IPC: B23K20/12

Abstract: A method for manufacturing a rod includes a step of preparing a hollow first member and a second member formed so as to have a portion smaller in outer diameter than an outer diameter of the first member, a restraining step of placing a restraining member into abutment with an outer peripheral surface of the first member, a step of moving an inner peripheral surface of the first member and an outer peripheral surface of the second member closer to each other while rotating at least one of the first member or the second member, and a step of joining the first member and the second member by welding with the aid of friction by axially pressing in the first member and the second member by a predetermined amount after placing the inner peripheral surface of the first member and the outer peripheral surface of the second member into contact.

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.