公开(公告)号：US11352676B2

公开(公告)日：2022-06-07

申请号：US17289000

申请日：2020-01-23

申请人： KOMATSU LTD.

发明人： Yusuke Imadu ,  Toshiyuki Iseki ,  Takaaki Sasaki ,  Motomi Mizugai

IPC分类号： F16H57/08 ,  C21D5/00 ,  C21D1/18

摘要： A machine component, made of steel or cast iron and having a circular hole that opens in a first surface, includes a plurality of first quench-hardened regions that include the first surface and are arranged apart from each other along a first circle surrounding the hole when viewed in a plane in a direction perpendicular to the first surface, and a base region that is a region other than the first quench-hardened regions.

公开(公告)号：US10458505B2

公开(公告)日：2019-10-29

申请号：US15527638

申请日：2015-03-13

申请人： KOMATSU LTD.

发明人： Toshiyuki Iseki

IPC分类号： B22F5/00 ,  F16F9/32 ,  C23C4/06 ,  C23C4/10 ,  C22C19/03 ,  C22C19/05 ,  C22C29/02 ,  F16J7/00 ,  C23C4/129 ,  B22F3/115 ,  C22C29/06 ,  F16F9/06

摘要： The cylinder rod of a hydraulic cylinder includes a body portion having a bar shape, and a head portion arranged at a longitudinal end of the body portion. The body portion has a coating formed on its outer peripheral surface. The coating includes, in terms of area ratio in cross section, not less than 56.1% and not more than 84.4% of a chromium carbide phase, with the remainder consisting of a nickel-based alloy phase and an oxide phase. The area ratio of the chromium carbide phase may be 61.7% or more.