To provide a coupling structure having a floating member being a divided Oldham coupling itself while utilizing the merit of eccentric absorption of the Oldham coupling.

A driving shaft side coupling 53 and the floating member 55 are prevented from separating in the axial direction by a pin 63 penetrating a long hole 53a of the driving shaft side coupling 53 and a hole 55a of the floating member 55, and held slidably in the sliding direction of the floating member 55 and the shaft side coupling 53. The floating member 55 and a driven shaft side coupling 54 are separable. In this way, a coupling structure can be obtained in which the floating member 55 is the divided Oldham coupling itself while the merit of eccentric absorption of the Oldham coupling can be utilized. Engagement of the floating member 55 with one of the driving shaft side coupling 53 and the driven shaft side coupling 54 prevents separation in the axial direction, the floating member 55 and the engaged coupling are slidably held in the sliding direction, the floating member 55 and the other shaft side coupling are made separable, and a simple shaft coupling can be formed.

COPYRIGHT: (C)2010,JPO&INPIT