| 摘要 |
A compact hub-embedded multi-stage transmission is provided which is implemented to achieve multi-stage shifting by using a multi-stage planetary gear set having a one stage or two or more stages and a double one-way clutch in order to impart an overrunning function during inertial travel, and at the same time, to allow rapid shifting to be made even with a small force for manipulating a shift lever by means of use of a forced shift function even in a driven travel state. Accordingly, product marketability can be maximized, and rapid shifting can be made even with a small force for manipulating a shift lever by means of use of a forced shift function even in a driven travel state, thereby considerably improving shifting accuracy. |
| 主权项 |
1. A hub-embedded multi-stage transmission, comprising:
a shaft (100) fixed to a vehicle body, a driver (200) for receiving a rotational force, and a hub shell (300) for outputting the rotational force, the driver and the hub shell being rotatably located on an outer periphery of the shaft (100); a shifting unit (400) for changing the rotational force input from the driver (200) and outputting the changed rotational force to the hub shell (300), the shifting unit (400) comprising a planetary gear set (410) composed of a sun gear, a planetary gear (412), a carrier (413) and a ring gear (414) provided within the hub shell (300), a first output clutch (420) provided as a one-way clutch between the carrier (413) and the hub shell (300), and a second output clutch (430) provided as two one-way clutches integrally formed with each other to have a certain difference in phase angle and positioned between the driver (200) and the ring gear (414) and between the ring gear (414) and the hub shell (300), respectively, whereby the rotational force of the driver (200) is transferred to the ring gear (414) or the rotational force of the ring gear (414) is transferred to the hub shell (300) depending on a difference in rotational speed; and a control unit (500) for controlling shifting of the shifting unit (400), the control unit (500) comprising a circumferential pawl control member (510) circumferentially rotatable to control a plurality of pawls located in pawl seating portions formed on an outer peripheral surface of the shaft (100) depending on manipulation of a shift lever, thereby selectively restricting the rotation of the sun gear, and an axial pawl control member (520) axially movable to control pawls provided on an inner peripheral surface of the driver (200) depending on the manipulation of the shift lever, thereby selectively transferring the rotation of the driver (200) to the carrier (413). |
