Abstract: A power-assisted system is to be assembled to a derailleur-equipped bicycle for providing an auxiliary force to the bicycle. The power-assisted system includes: a microcomputer; a pedaling-rate sensor; a bicycle-speed sensor; a shift-position source; and an auxiliary-force database including data about at least a pedaling rate, a running speed, a current gear ratio and the auxiliary force, for defining a ratio between the running speed and the current gear ratio as a first comparison value, and defining the pedaling rate as a second comparison value wherein an auxiliary-force comparison table is made of levels of the auxiliary force to be output corresponding to the first and second comparison values. The microcomputer uses a determining logic circuit to determine the suitable level of the auxiliary force to be output and control the auxiliary-force providing device to output the auxiliary force in the determined level.

Abstract: A caster switching mechanism for installation in a footboard of a scooter is used to control, through a switch pivotally connected with the footboard, whether a wheel seat is rotatable relative to footboard. When the switch is located at a restricted position where the wheel seat is stopped by the switch, the wheel seat is prohibited from rotation relative to the footboard such that a wheel that is rotatably mounted to the wheel seat can roll along one direction only. When the switch is located at an unrestricted position where the switch is separated from the wheel seat, the wheel seat is rotatable relative to the footboard such that the wheel can roll along any direction corresponding to the orientation of the wheel seat.

Abstract: A bicycle battery connection system includes a battery data determination circuit, a battery data processing circuit and an adapter. The battery data determination circuit is electrically connected to one of the first-type battery having an MCU and a second-type battery without an MCU through the adapter for enabling battery data of the connected battery to be processed by the battery data processing circuit and outputted as battery status for display on a display device in front of the user and for further battery output control. Thus, either a first-type battery or a second-type battery can be used and detected for automatic matching, and therefore the battery connection system allows a bicycle to use any of different types of batteries.

Abstract: A torque detecting system for a bottom bracket axle of a power-assisted bicycle includes a torque sensor for being mounted on the bottom bracket axle of the bicycle, a wireless signal transmitter arranged stationarily relative to the bottom bracket axle, and a wireless signal receiver for being arranged at a location of a bicycle frame of the bicycle in proximity to the bottom bracket axle. The wireless signal transmitter is adapted for receiving a detected signal, which is outputted from the torque sensor, and then transmitting the detected signal to the wireless signal receiver wirelessly. In this way, the signal attenuation and the possibility of signal loss of the detected signal can be minimized during the signal transmission, such that the torque applied on the bottom bracket axle by the bicyclist can be detected precisely.

Abstract: A bicycle battery connection system includes a battery data determination circuit, a battery data processing circuit and an adapter. The battery data determination circuit is electrically connected to one of the first-type battery having an MCU and a second-type battery without an MCU through the adapter for enabling battery data of the connected battery to be processed by the battery data processing circuit and outputted as battery status for display on a display device in front of the user and for further battery output control. Thus, either a first-type battery or a second-type battery can be used and detected for automatic matching, and therefore the battery connection system allows a bicycle to use any of different types of batteries.

Abstract: A combination vehicle frame includes a base frame unit formed of a plurality of frame bars detachably connected to one another. One of the frame bars is provided with a head having intersected first through hole and second through hole. A rear wheel frame unit is detachably connected to the base frame unit remote from the head. A front wheel frame unit is selectively inserted through one of the first through hole and second through hole of the base frame unit.

Abstract: A device includes a first movable member having at least a slot on an inner wall thereof; a second movable member provided in the first movable member; a sliding sleeve, which has at least a recess, provided between the first movable member and the second movable member; and at least a rolling member received in the recess of the sliding sleeve and contacting an inner wall of the slot of the first movable member and an outer wall of the second movable member. Whereby, the second movable can not rotate relative to the first movable member and only can move relative to the first movable member.

Abstract: A combination vehicle frame includes a base frame unit formed of a plurality of frame bars detachably connected to one another. One of the frame bars is provided with a head having intersected first through hole and second through hole. A rear wheel frame unit is detachably connected to the base frame unit remote from the head. A front wheel frame unit is selectively inserted through one of the first through hole and second through hole of the base frame unit.

Abstract: A power device of the scooter comprises a motor, an elastic member, and a one-way bearing. The motor is mounted over the rear fork of the scooter footboard and is provided with a transmission shaft on which a drive wheel is mounted. The elastic member is fastened at two ends with the footboard of the scooter for forcing the drive wheel to press intimately against the rear wheel of the scooter. The one-way bearing is disposed on the transmission shaft such that the one-way bearing is received in the drive wheel for providing a one-way clutching effect, thereby enabling the drive wheel to receive the power of the motor in a predetermined manner so as to drive the rear wheel of the scooter. When the motor is stopped, the rear wheel is hauled to rotate on its own.

Abstract: A power device of the scooter comprises a motor and a unidirectional bearing. The motor is mounted in proximity of the rear wheel of the scooter and is provided with an output shaft which is connected with the axle of the rear wheel. The unidirectional bearing is disposed on the axle of the rear wheel to provide a unidirectional clutching effect enabling the rear wheel to receive the power transmission of the motor in a predetermined manner. As the motor is started, the output shaft of the motor drives the rear wheel to turn at a constant speed. As the motor is stopped, the rear wheel in motion is hauled to turn on its own.