| 摘要 |
PROBLEM TO BE SOLVED: To provide an inscription engagement planetary gear mechanism improved in torque transmission efficiency.SOLUTION: Transmission means 60 is constituted of a first transmission face 61 and a second transmission face 63 which are formed at an outer gear 40, and a first transmitted face 62 and a second transmitted face 64 which are formed at an output shaft 50, and can abut on the transmission faces 61, 63 in a rotational direction. The transmitted faces 62, 64 are plane faces. The transmitted faces 62, 64 are formed so that extension plane faces being virtual plane faces which are extensions of the transmitted faces 62, 64 pass through an axial core AX1, and become parallel with the axial core AX1. Therefore, when the output shaft 50 rotates, a normal direction of a contact face of the transmission means 60 coincides with a direction vertical to the transmitted faces 62, 64 being the plane faces, and constantly coincides with a rotational direction of the output shaft 50 during the rotation of the outer gear 40. Accordingly, a radial component is not contained in a force acting on the output shaft 50 from the outer gear 40, and a loss at a bearing part of the output shaft 50 resulting from the radial component is not generated.SELECTED DRAWING: Figure 3 |
