| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic clutch which is small in magnetic resistance, improved in performance as the electromagnetic clutch, suppressed in an increase of weight, and reduced in a limit on a freedom of the selection of a component accompanied by the consideration of a difference of linear expansion coefficients.SOLUTION: An electromagnetic clutch 1 comprises a cylindrical inner ring part 5 which holds a bearing 4 at its internal periphery, and a friction part 7 having a friction face 6 which extends to the radial direction from the inner ring part 5. The electromagnetic clutch also comprises an outer ring part 8 which is arranged while being coated on a periphery of the inner ring part 5, and joined to the friction part 7, and a pulley part 3 which is formed integrally with the friction part 7 or the outer ring part 8, and forms a one-side member. The electromagnetic clutch further comprises an electromagnetic coil 12 which is arranged while being sandwiched between an external periphery of the inner ring part 5 and an internal periphery of the outer ring part 8, and an armature 13 which is adsorbed to the friction part 7 by an electromagnetic force which is generated by the electromagnetic coil 12, and forms the other side member. The electromagnetic clutch further comprises a joining part 9 which is joined between the outer ring part 8 and the friction part 7 by friction welding. |
