| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed reduction mechanism capable of achieving extension of the service life of a bearing, and a motor rotational force transmission device including the same.SOLUTION: A speed reduction transmission mechanism 5 comprises: a motor shaft 42 having an eccentric part 42a; an input member 50 rotatably supported by the outer peripheral surface of the eccentric part 42a via a ball bearing 54 and comprising an external gear having a plurality of pin insertion holes 50b arranged around the axis at equal intervals; a rotational force application member 52 engaged with the input member 50 and comprising an internal gear in which the number of teeth thereof is larger than that of the external gear; and a plurality of output members 53 receiving the rotational force applied to the input member 50 by the rotational force application member 52, outputting the rotational force to a differential case 30 as the rotational force for the same, and inserted into the plurality of pin insertion holes 50b. The input member 50 has annular projections 50e, 50f projecting in the axial direction. The circumferential surfaces of the projections 50e, 50f are formed as rolling-contact surfaces 500e, 500f which are in rolling-contact with the differential case 30. |
