Wheel hub motor and electric bicycle

Abstract

The invention discloses a wheel hub motor and an electric bicycle. The wheel hub motor comprises a central shaft, a first transmission assembly and a second transmission assembly, wherein the first transmission assembly includes a stator and a rotor; the second transmission assembly includes a sun gear, a duplex planetary gear, an inner gear ring and a one-way clutch; the duplex planetary gear includes a large planetary gear and a small planetary gear; the sun gear is engaged with the large planetary gear, the large planetary gear is fixedly connected with the small planetary gear, the small planetary gear is engaged with the inner gear ring, and a bearing pedestal of the inner gear ring is fixedly connected with the one-way clutch. When a motor of the electric bicycle is electrified or started, the rotation of the inner gear ring drives the one-way clutch so as to enable the one-way clutch to be in an operating state. The motor is enabled to be large in output torque through a gear transmission device; and the wheel hub motor is enabled to achieve a high transmission ratio and be reduced in volume through an NW planetary transmission structure.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a hub motor and an electric bicycle. Background technique [0002] In recent years, electric bicycles have gradually been accepted by consumers as an environmentally friendly and energy-saving means of transportation. Whether at home or abroad, the sales of electric bicycles in the world are also increasing year by year, and the trend of electric bicycles replacing bicycles is gradually expanding. , and the electric bicycle hub motor is the core component of the electric bicycle, and its quality often determines the overall quality of the electric bicycle. [0003] At present, the hub motors of electric bicycles on the market are mainly divided into two categories, direct drive motors and traditional toothed motors; among them, the disadvantages of the direct drive motors are that they are large in size, small in output torque, difficult to climb, and easy to burn out under heavy ...

AI Technical Summary

Problems solved by technology

[0003] At present, the hub motors of electric bicycles on the market are mainly divided into two categories, direct drive motors and traditional toothed motors; among them, the disadvantages of the direct drive motors are that they are large in size, small in output torque, difficult to climb, and easy to burn out under heavy loads. Bad; although the torque of the traditional geared motor has been improved compared with the direct drive motor, the volume is still large, which affects the appearance

Moreover, in order to achieve a larger transmission ratio of the gear transmission, the existing motor generally adopts a broken shaft design. The broken shaft design refers to dividing the central shaft into three sections, which is used to make the sun gear smaller, thereby increasing the transmission ratio; but This structure will lead to the weakening of the strength of the entire mandrel; the traditional motor also uses a fixed shaft hollow outlet, that is, a through hole is opened in the middle of the fixed shaft to lead the outlet end, which will also weaken the strength of the mandrel.

Therefore, the existing wheel hub motor will greatly reduce the overall working reliability and safety of the electric bicycle

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