公开(公告)号：US10473167B2

公开(公告)日：2019-11-12

申请号：US15878364

申请日：2018-01-23

Applicant: OGURA CLUTCH CO., LTD.

Inventor： Motoi Kato ,  Yoshihiro Kurosu ,  Yasuyuki Iizuka ,  Shun Tomaru

IPC: F16D27/112 ,  F16D13/76 ,  F16D27/00

Abstract: An electromagnetic clutch includes a field core including a coil storage groove, and a rotor including a core storage groove. The coil storage groove is formed by an inner cylindrical portion, an outer cylindrical portion, and a bottom portion. The bottom portion of the field core wholly projects to the outside of the core storage groove. The outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the outer cylindrical portion include a first transition surface and a second transition surface, respectively, on the bottom portion side. Each of the first transition surface and the second transition surface includes a tilting surface that gradually narrows the groove width of the coil storage groove along with an increase in a distance from the side of the opening of the coil storage groove.