Drive unit of a vehicle drive shaft

problem It is an object of the present invention is to obtain the uniform bias of a damper spring upright and the setting of the Eingreifbetrags of bevel gears in a drive unit with a cam damper mechanism, and a pair of bevel gears on an elongated shaft of an output shaft of the drive unit to facilitate. Means to Solve the Problem The drive unit in which a cam member 85 of a cam damper mechanism 8 is mutually non-rotatably provided on a bevel gear 41, one of a pair of bevel gears and rotatably provided on an extended shaft 6; a lifter member 81 is provided slidably in the axial direction and non-rotatably on the elongated shaft; a damper spring 83 is constructed such that one of their end portions is kept at a first flange portion 82 of the extended shaft 83a, the other end side 83b of the lift member toward the cam member in the axial direction biases by abuts on the lift element, and the biasing force of the bevel gear, at least one of the bevel gears, is supported; and the elongated shaft bevel gear, one of the bevel gears, and the cam damper mechanism between the first flange portion and a first bearing 75 and being received in the bevel gear 40 to be fixed together with the first bearing at a Kegelradhalterung.