Torque transmission device of electric power-assisted bicycle

Abstract

The invention discloses a torque transmission device of an electric power-assisted bicycle. A shell in the torque transmission device is fixed to a bicycle frame, and inner helical tooth of an inner helical gear ring and outer helical tooth of an outer helical gear ring mesh with one another and are all installed on a central shaft in a sleeving mode; a first overrunning clutch is arranged betweenthe central shaft and the inner helical gear ring, a sensing inner bowl and a sensing pressing ring are installed on the section, away from the inner helical gear ring, of the outer helical gear ringfar, and the sensing pressing ring and the outer helical gear ring are fixed together; the outer circumference of the sensing inner bowl is fixed to the shell, the sensing inner bowl is made of elastic materials, and a resistance-type thin film pressure sensor is bonded to the end face of the sensing inner bowl; one end of the sensing pressing ring presses the end face of the sensing inner bowl through a plurality of balls, and a transmission seat cover meshes with the other end of the sensing pressing ring through straight tooth; the central shaft is sleeved with the transmission seat coverthrough a seat cover bearing in a penetrating mode, a chain disc fixedly penetrates through the outer side section of the transmission seat cover in a sleeving mode, and a driven gear is installed onthe inner section of the transmission seat cover in a sleeving mode through a second overrunning clutch; and the driven gear meshes with a driving gear set on a motor for transmission.

Description

Technical field: [0001] The invention relates to a torque transmission device for an electric power-assisted bicycle. Background technique: [0002] There is an abnormal phenomenon of human-machine separation in traditional electric power-assisted bicycles. That is to say, when the motor of the vehicle is running, because its speed is higher than the pedaling speed of the human body, the pedals of the vehicle are useless. Assist in driving the vehicle. For this reason, the industry has developed a method of using the Hall induction magnetic field strength to control the output torque of the motor. The Hall is installed on the elastic member. Deformation, elastic deformation, Hall produces displacement at the same time, cancel the pedaling force, the elastic part returns to its original shape, and Hall produces reverse displacement. The displacement caused by the above causes Hall to move away from or approach the magnetic parts, and Hall obtains signals of different magnet...

AI Technical Summary

Problems solved by technology

The above-mentioned displacement makes Hall move away from or close to the magnetic parts, and Hall obtains signals of different magnetic field strengths. The control system controls the output force of the motor according to the signals, and cooperates with the pedaling force of the human body to realize a hybrid drive vehicle. The structure can realize electric power assist, but the structure is relatively complicated. Using the Hall to obtain the signal will be affected by the quality of the Hall, and this structure is easily affected by the external magnetic field to affect the induction effect of the Hall, resulting in abnormal output power of the motor.

Images