PROBLEM TO BE SOLVED: To provide a driving force transmission device capable of improving the response of a main cam and an armature at the time of clutch action, and capable of preventing the increasing size of an electromagnetic coil.;SOLUTION: The driving force transmission device 1 includes a first cam mechanism 10 which converts a rotational force from a housing 12 received by clutch action of an electromagnetic clutch 9 to a pressurizing force which is to be a clutch force of a multiple-disc clutch 8, and includes a main cam 10a which supplies a pressurizing force to the multiple-disc clutch 8 and a cam ball 10c for clutch action which is interposed between the main cam 10a and an armature 9b. It also includes a second cam mechanism 11 which contains a coil spring 27 that supplies a spring force, directed to the multiple-disc clutch 8 side, to the first cam mechanism 10 and a cam bush 28 that moves to an electromagnetic coil 9a side against the spring force of a coil spring 27 according to rotation of the main cam 10a.;COPYRIGHT: (C)2012,JPO&INPIT
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