发明授权
- 专利标题： Hollow power transmission shaft and method of manufacturing the same
- 专利标题（中）： 空心动力传动轴及其制造方法
-
申请号： US11659135申请日： 2005-07-21
-
公开(公告)号： US08101031B2公开(公告)日： 2012-01-24
- 发明人: Katsuhiro Sakurai , Toru Nakagawa , Masamichi Shinbo , Masami Yamaguchi , Tsuneaki Hiraoka
- 申请人： Katsuhiro Sakurai , Toru Nakagawa , Masamichi Shinbo , Masami Yamaguchi , Tsuneaki Hiraoka
- 申请人地址： JP Osaka
- 专利权人： NTN Corporation
- 当前专利权人： NTN Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Wenderoth, Lind & Ponack, L.L.P.
- 优先权： JP2004-225730 20040802; JP2004-227013 20040803; JP2004-245784 20040825
- 国际申请： PCT/JP2005/013390 WO 20050721
- 国际公布： WO2006/013730 WO 20060209
- 主分类号： B21C37/16
- IPC分类号： B21C37/16 ; B21D22/28 ; C21D1/10 ; F16C3/02
摘要：
A hollow shaft material is provided with, on an outer peripheral surface side thereof, for example, a movable induction heating coil wrapped therearound. While a high-frequency current with a predetermined frequency is caused to flow through the induction heating coil, the induction heating coil is axially moved to perform induction hardening of the hollow shaft material from the outer peripheral surface side. At this moment, the frequency of the high-frequency current caused to flow through the induction heating coil is set relatively low as to the small-diameter portions, which have a relatively small thickness, and the frequency of the high-frequency current caused to flow through the induction heating coil is set relatively high as to the large-diameter portion, which has a relatively small thickness.