Patent ID: 7670228

Claim:
A coupling apparatus for transmitting a rotating force of a first rotary shaft to a second rotary shaft, the second rotary shaft being arranged so as to be coaxial with the first rotary shaft, the coupling apparatus comprising: a first coupling member having a first end surface and a coupling hole, the first coupling member rotating together with the first rotary shaft inserting through the coupling hole; a second coupling member formed integrally with the second rotary shaft for rotating together with the second rotary shaft, the second coupling member having a second end surface, a cylindrical circumferential wall and a bottom surface, the second end surface having a recess so as to intergally form the circumferential wall in the second rotary shaft, the bottom surface being surrounded by the circumferential wall and inclined toward a center of the second rotary shaft in the radial direction; a damper member arranged between the first coupling member and the second coupling member in such a manner as to transmit a rotating force of the first coupling member to the second coupling member, wherein the damper member has an elasticity and defines an outer circumference, the damper member having a through hole through which the first rotary shaft is passed, the circumferential wall surrounding the outer circumference of the damper member so that the circumferential wall limits the radially outward deformation of the damper member; and a spherical body arranged between the first end surface and the bottom surface, wherein a thrust force is transmitted to the second rotary shaft from the first rotary shaft or vice versa through the spherical body.