Patent ID: 7958969

Claim:
A transfer device for a vehicle, comprising: a casing; a cylindrical input shaft supported by the casing so as to rotate, a first end of the input shaft engaging with a driveshaft for driving the input shaft; an output shaft supported on an internal surface of a second end of the input shaft so as to relatively rotate and directly or indirectly engaging with the second end of the input shaft to transmit a torque to driven members, the output shaft including an oil passage formed therein in an axial direction; a lubrication fluid supply passage supplying a lubrication fluid from the casing to the oil passage formed in the axial direction in the output shaft; the lubrication fluid supply passage comprising: an inner fluid tight chamber annularly formed with an external surface of the output shaft and an internal surface of the input shaft; a first passage establishing a communication between the inner fluid tight chamber and the oil passage formed in the axial direction; a second passage extending in the axial direction for establishing a communication between the inner fluid tight chamber and an external surface of the input shaft, the second passage being parallel to the oil passage in the output shaft; and wherein the input shaft is formed with a spline on the internal surface thereof, the spline extending over a predetermined length from the first end of the input shaft, the spline engages with the drive shaft, an outer fluid tight chamber is formed within a range of the predetermined length from the first end of the input shaft so as to axially overlap with the spline, and the inner fluid tight chamber is formed outside the range of the predetermined length from the first end of the input shaft so that the inner fluid tight chamber does not axially overlapping with the spline.