Compound power mechanism and electric bicycle
OwnerShyang-Jun Wuinventor
Life of this patent
Estimating the term…
Abstract
A compound power mechanism and an electric bicycle are provided. The compound power mechanism includes a motor casing fixed to the bicycle, a motor drive shaft coupled with a rotor, and a stator provided in the motor casing. A crank drive shaft is disposed in the motor drive shaft. Two ends of the crank drive shaft extend out of the two ends of the motor drive shaft and are coupled with pedal cranks. A freewheel is coupled to a respective end of the motor drive shaft and the crank drive shaft. A drive sprocket is located between and coupled to the two freewheels and adapted to bring a bicycle chain to turn. The drive sprocket can be driven by the motor drive shaft or by the crank drive shaft when pedaled. The size of the motor is reduced and the cost of manufacture is lowered.
Claims10
A compound power mechanism, mounted to a bicycle, the compound power mechanism comprising a motor casing, the motor casing having two shaft holes at two opposing sides thereof;
- a motor drive shaft disposed between the shaft holes at the two sides of the motor casing, the motor drive shaft having a central inner shaft hole communicating with two ends thereof;
- a stator coupled in the motor casing and a rotor coupled to the motor drive shaft;
- a crank drive shaft disposed in the inner shaft hole of the motor drive shaft, two ends of the crank drive shaft extending out of the two ends of the motor drive shaft;
- a freewheel coupled to one end of the motor drive shaft;
- another freewheel coupled to one end of the crank drive shaft;
- and a drive sprocket located between and coupled to the two freewheels, the freewheels respectively bringing the drive sprocket to turn unidirectionally so as to turn a rear wheel of the bicycle.
An electric bicycle, comprising:
- a bicycle frame, a bottom of the bicycle frame being provided with a coupling portion, the coupling portion being disposed at the junction of a rear lower fork tube and a lower tube and seat pillar post of the bicycle frame, the bicycle frame or a luggage carrier being provided with a lithium battery unit of a variable-frequency continuously variable transmission;
- and
- a motor casing fixed to the coupling portion of the bicycle frame, the motor casing having two shaft holes at two opposing sides thereof;
- a motor drive shaft disposed between the shaft holes at the two sides of the motor casing, the motor drive shaft having a central inner shaft hole communicating with two ends thereof;
- a stator coupled in the motor casing, the stator being electrically connected with the lithium battery unit of the variable-frequency continuously variable transmission, a rotor coupled to the motor drive shaft;
- a crank drive shaft disposed in the inner shaft hole of the motor drive shaft, two ends of the crank drive shaft extending out of the two ends of the motor drive shaft;
- a freewheel coupled to one end of the motor drive shaft;
- another freewheel coupled to one end of the crank drive shaft;
- and a drive sprocket located between and coupled to the two freewheels, the drive sprocket being wound with a chain, the chain being wound on a derailleur provided at a rear wheel of the bicycle.
Dependencies are inferred from the claim text.