Patent ID: 6905007
Filing Date: 2005-06-14
Classification: F16D

Abstract:
1. A power transfer device comprising a bottomed cylindrical housing rotatably mounted on an inner shaft and a main friction clutch and a pilot friction clutch coaxially assembled through a cam mechanism within a cylindrical space between the housing and the inner shaft, wherein the pilot friction clutch is in the form of an electromagnetic friction clutch including a plurality of inner clutch plates assembled with an input member of the cam mechanism, a plurality of outer clutch plates assembled with an inner periphery of the housing and interposed among the inner clutch plates, wherein one of the inner clutch plates or outer clutch plates is located at one side of the pilot friction clutch, an end wall block threaded into an opening end portion of the housing and positioned in place in a condition rotatably coupled with the inner shaft for retaining the one of the inner clutch plates or outer clutch plates located at one side of the pilot friction clutch by engagement therewith at its inner end surface, an electromagnet assembled in the end wall block and an armature assembled with an internal periphery of the housing at the other side of the friction clutch to be movable in an axial direction, wherein the armature is attracted by magnetic force of the electromagnet to effect engagement of the pilot friction clutch, a thrust bearing placed between the input member of the cam mechanism and the end wall block, an adjustment member disposed between the thrust bearing and the end wall block for adjusting a clearance between the inner end surface of the end wall block and the one of the inner clutch plates or outer clutch plates located at one side of the pilot friction clutch, and wherein a thickness of the adjustment member is a function of a distance between one side surface of the thrust bearing and the inner clutch plate or outer clutch plate located at one side of the pilot friction clutch.