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.