HUB UNIT FOR BICYCLE, ELECTRICALLY ASSISTED BICYCLE USING HUB UNIT FOR BICYCLE, AND ELECTRIC TWO-WHEELED VEHICLE USING HUB UNIT FOR BICYCLE

摘要

A device configured so that the device is compact and the drag torque of a motor is reduced. A transmission mechanism section (30), a speed reduction mechanism section (40), and a drive motor (18) are provided within a hub (10) so as to be arranged side-by-side along an axle (15). The transmission mechanism section (30) transmits the drive force of human power to a hub case (11), and the speed reduction mechanism section (40) transmits the drive force of the drive motor (18) to the hub case (11). The transmission mechanism section (30) is provided with a sun gear (30a) for a transmission, planetary gears (30b) for a transmission, and a planetary carrier (30c) for a transmission, and the planetary carrier (30c) for a transmission serves as an output member for providing an output to the hub case (11). The speed reduction mechanism section (40) is provided with a sun gear (40a) for a speed reducer, planetary gears (40b) for a speed reducer, and an outer ring gear (40d) for a speed reducer. The planetary gears (40b) for a speed reducer are meshed with the outer ring gear (40d) for a speed reducer. The planetary carrier (30c) for a transmission, the planetary carrier (30c) holding the planetary gears (40b) for a speed reducer, serves as an output member for providing an output to the hub case (11). A switching clutch (20) is provided between the outer ring gear (40d) for a speed reducer or a planetary carrier (40c) for a speed reducer and the motor housing (18b) of the drive motor (18).