公开(公告)号：US20180058516A1

公开(公告)日：2018-03-01

申请号：US15557491

申请日：2016-05-23

Applicant: DENSO CORPORATION

Inventor： Yousuke YAMAGAMI ,  Hirotaka MATSUMOTO ,  Motohiko UEDA ,  Masashi TOBAYAMA ,  Satoshi KAWAKAMI

IPC: F16D27/112 ,  F16D13/64 ,  C23C8/30

CPC classification number: F16D27/112 ,  C23C8/30 ,  C23C10/14 ,  C23C10/24 ,  C23C10/60 ,  F16D3/76 ,  F16D13/40 ,  F16D13/64 ,  F16D13/76 ,  F16D2200/0021 ,  F16D2200/0052 ,  F16D2250/0046 ,  F16H55/36

Abstract: A clutch includes: a rotor that has a steel material as a base material and is rotated upon receiving a rotational drive force from a drive source; and an armature that has a steel material as a base material and receives the rotational drive force from the rotor when the armature is attracted to the rotor by a magnetic force. The armature has a contact surface side region that includes a contact surface, which contacts a counterpart when the armature is attracted to the rotor. The contact surface side region has a plurality of pores opened at the contact surface and forms a nitride compound of an element of the base material through nitridization of a part of the base material while the contact surface side region is harder than an unreacted portion of the base material that is not reacted at the nitridization.