COUPLING STRUCTURE OF ROTARY SHAFT

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of jolting in a radial direction and a rotation direction to a spline fit-in part between an armor shaft and an internal shaft. SOLUTION: This rotary shaft comprises an armor shaft 11 having a spline hole part 11a; an internal shaft 12 having a spline shaft part 12a axially slidable over and torque-transmittably fitted in the spline hole part 11a of the armor shaft 11; and an elastic body interposed at a spline-fit-in part between the two shafts 11 and 12 and forcing a part of the spline shaft part 12a of the internal shaft 12 into pressure contact with a part of the spline hole part 11a of the armor shaft 11. In the coupling structure of the rotary shaft, a resin elastic body 13 integrally assembled at a part of the spline shaft part 12a of the internal shaft 12 and fitted in a wedge-form manner in a part of the spline hole part 11a of the armor shaft 11 and interposed in a state to be compression- deformed in a radial direction and a rotation direction by a given amount is employed as the elastic body.