Patent ID: 8882568

Claim:
An impact absorbing mechanism of a gear train that transmits the rotational power of a driving shaft to a driven shaft, wherein the gear train includes a drive gear on the side of the driving shaft and a driven gear on the side of the driven shaft, which mesh with each other, wherein, in a rotational power transmission path between the driven gear and the driven shaft, there is provided a radial displacement member that is supported by the driven gear so as to be displaceable in a radial direction, an axial displacement member that displaces in an axial direction by the displacement of the radial displacement member in a diameter expanding direction, and an axial elastic member that performs an impact absorbing action with respect to the displacement of the axial displacement member in the axial direction, and wherein the axial displacement member is displaced in the axial direction by the rotation of the driven gear relative to the driven shaft, so that impact generated upon meshing between the drive gear and the driven gear is absorbed.