| 摘要 |
A gear mounting portion of a rotating shaft includes a shaft portion, with a D-shaped cross-section, engaged with a connecting portion of a gear having a D-shaped cross-section; the connection portion provided with a first hole portion; one flexible portion provided along the axial direction; and a retaining portion provided at a tip of the flexible portion. The retaining portion protrudes outwards with respect to the shaft portion, and the shaft portion is engaged with the connecting portion after the retaining portion has passed through a second hole portion of a hollow shaft. The flexible portion remains bent while the retaining portion passes through the second hole portion of the hollow shaft. Once the shaft portion engages with the first hole portion of the connecting portion, the flexible portion ceases to bend and engages with the gear. As a result, without damaging the rotating shaft, the gear is reliably prevented from coming free from the rotating shaft. |
| 主权项 |
1. A power transmission body mounting structure in which a power transmission body is mounted onto an end portion of a rotating shaft, the power transmission body mounting structure comprising:
a hollow shaft and a power transmission portion provided in the power transmission body, the power transmission portion disposed at a front end of the hollow shaft, the hollow shaft having an axial hole including a first hole portion with a non-circular cross-section and a second hole portion located closer to a tip of the end portion of the rotating shaft than the first hole portion is, the second hole portion having a different cross-sectional shape than the first hole portion, the different cross-sectional shape of the second hole portion extending from the power transmission portion toward a rear end of the hollow shaft to a point between the power transmission portion and the rear end, the first hole portion extending from the point to the rear end of the hollow shaft; a shaft portion, with a non-circular cross-section, provided in the rotating shaft and engaged with the first hole portion so as to rotate integrally with the power transmission body; a flexible portion provided between the shaft portion and the tip of the end portion of the rotating shaft; and a retaining portion provided at the tip of the rotating shaft, having a cross-sectional shape allowing for passage through the axial hole, protruding beyond the shaft portion in a direction perpendicular to an axial direction, and engaged with an area near an end of the axial hole, wherein when the power transmission body is mounted onto the end portion of the rotating shaft, the shaft portion engages with the first hole portion after the retaining portion completely passes through the first hole portion, and while the retaining portion is passing through the second hole portion, the flexible portion contacts with the second hole portion and bends, and once the retaining portion passes completely through the axial hole, the flexible portion ceases to bend so that the retaining portion engages with the area near the end of the axial hole. |
