Drive power transmission comprising electromagnetic clutch

摘要

In a power transfer device composed of a bottomed cylindrical housing 20a rotatably mounted on an inner shaft 20b and a main friction clutch 20c and a pilot friction clutch 30a coaxially assembled within a cylindrical space between the housing 20a and inner shaft 20b through a cam mechanism 30b, the thickness of a shim plate 39b for adjustment of a clearance between an inner clutch plate or outer clutch plate located at one side of an electromagnetic clutch 30a used as the pilot friction clutch and an inner end surface of an end wall block 21b threaded into an opening end portion of the housing 20a is determined on a basis of a clearance L1 between one side surface of a thrust bearing 39a assembled with an input cam member 35 of the cam mechanism 30b and an inner clutch plate or outer clutch plate located at one side of the electromagnetic clutch 30a.