Gear shifting planet gear speed reducer for electric wheelchair

Abstract

A gear shifting planet gear speed reducer for an electric wheelchair comprises a three-stage planet gear speed reducing transmission mechanism. The axis of a third-stage speed reducing large gear and the axis of a third-stage speed reducing small gear are each provided with a spline, the third-stage speed reducing large gear and the third-stage speed reducing small gear are installed on a power output shaft provided with a spline which is of the same specification as the splines of the third-stage speed reducing large gear and the third-stage speed reducing small gear and can axially slide, the third-stage speed reducing small gear and the third-stage speed reducing large gear are each provided with an axial shifting fork, a return spring is arranged between the two shifting forks in a matched mode, and the gear shifting planet gear speed reducer is a neural gear in the in-situ state. When a high-speed gear is needed, the small gear is poked to be meshed with a second-stage large gear. When a low-speed gear is needed, the large gear is poked to be meshed with a second-stage small gear. The speed reducer achieves mechanical speed reduction of the high-speed gear and the low-speed gear, constant power output of two different gear speed ratios is achieved, the requirement of the wheelchair for low rotation speed and large torque is met, the wheelchair can adapt to a motor according to needs, the situation that a small vehicle is driven by large power is avoided, and gradeability, obstacle crossing ability and cruising ability of the wheelchair are enhanced.

Description

technical field [0001] The invention relates to a power drive device for an electric wheelchair, which is a planetary gear reducer with fast gear, slow gear and neutral gear. Background technique [0002] At present, the reducers of electric wheelchairs all have a single speed ratio output and worm gear transmission. The speed of the wheelchair and the size of the required torque are completely regulated by the output power of the motor. In this way, a series of problems arise. When the wheelchair encounters obstacles, complex road conditions, large slopes, etc., and needs to reduce the high torque, the output power of the motor with a single speed ratio decreases at the same time during the deceleration, so the high torque cannot be achieved. demand. Therefore, at present, electric wheelchairs often use high-power configurations in the selection of power motors. The efficiency of the electromechanical is low, and the energy consumption is large. In addition, the transmiss...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low electromechanical efficiency, high energy consumption, low battery life and poor obstacle-surpassing ability of current electric wheelchair drive devices, the present invention provides a gear-shiftable planetary gear reducer, which can greatly increase the unit power of electric wheelchairs. Endurance and obstacle-surmounting ability

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