Crank gear structure for electrical bicycle, has crank shaft assembly that is provided between transmitter wheels in torsion-labile manner so that rotational angle difference is formed at transmitter wheels

摘要

#CMT# #/CMT# The crank gear structure (1) has an output gear (4) fixed on a crank shaft assembly for power transmission on a wheel of a bicycle (2). A first transmitter wheel is rotationally fixed on crank shaft assembly. A second transmitter wheel is spaced apart from first transmitter wheel. Rotation angle sensors are provided for detecting rotational angles of the transmitter wheels respectively. The crank shaft assembly is formed between the transmitter wheels in torsion-labile manner so that rotational angle difference is formed at transmitter wheels. #CMT# : #/CMT# Independent claims are included for the following: (1) a bicycle; and (2) a control device for electrical bicycle. #CMT#USE : #/CMT# Crank gear structure for electrical bicycle (claimed). #CMT#ADVANTAGE : #/CMT# The rotational angles of the transmitter wheels of the bicycle can be determined accurately and efficiently at low cost using the rotation angle sensors which are contactless working inductive sensors. The rotational angle difference formed at the transmitter wheels can be measured efficiently. The installation space of the rotation angle sensors in the crank gear structure of the electrical bicycle can be reduced. The sensitivity of the rotation angle sensors can be increased. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of the electrical bicycle with crank gear structure. 1 : Crank gear structure 2 : Bicycle 4 : Output gear 6 : Electromotor 7 : Battery.