Patent ID: 7717796
Filing Date: 2010-05-18
Classification: F16D,Y10S

Abstract:
1. A shock absorbing structure of a propeller shaft transmitting a driving force in an internal combustion engine side to a drive wheel side, comprising: a first propeller shaft positioned in the internal combustion engine side; a second propeller shaft positioned in the drive wheel side; a coupling shaft coupling the first propeller shaft and the second propeller shaft; a joint member having an inner ring portion, the joint member being spline fitted to an outer periphery of the coupling shaft so as to transmit a rotating force of the first propeller shaft to the second propeller shaft, and the inner ring portion comprising a tilted surface tilted with respect to an axial direction; and a protruding portion arranged on an outer periphery of the coupling shaft, the protruding portion comprising a first surface that faces the tilted surface of the inner ring portion, a second surface on the opposite side of the protruding portion from the first face, and a plateau between the first and second surfaces, wherein a length of the plateau is shorter than that of the first surface in the axial direction, wherein the protruding portion is engagable with the tilted surface of the inner ring portion due to a sliding motion of the joint member on the coupling shaft, and wherein an outer diameter of the protruding portion is smaller than an outer diameter of the inner ring portion such that the tilted surface of the inner ring portion is brought into contact with a corner portion of the protruding portion when an impact force is applied to the shock absorbing structure.