Electric wheel hub

Abstract

The invention discloses an electric wheel hub, comprising a main shaft. A wheel hub casing is arranged on the main shaft through a wheel hub casing bearing; a motor, a planet wheel reducing gear and a clutch are arranged in the wheel hub casing; the motor uses a structure with an inner stator and an external rotor; a sun gear sleeved on the main shaft is fixed on the rotor and is meshed with a planet gear which is meshed with an inner gear ring fixed on the inner wall of the wheel hub casing; meanwhile, the planet gear is arranged on a planet shaft through a planet bearing; the planet shaft is fixed on the clutch which is fixed on the main shaft; and the planet gear adopts a duplicate gear which is formed by a bull gear and a pinion which are axially integrally formed, wherein the bull gear is meshed with the sun gear and the pinion is meshed with the inner gear ring. In the invention, the pinion of the duplicate gear is meshed with the inner gear ring, so that the inside diameter of the inner gear ring is reduced, the size of the wheel hub casing is correspondingly reduced, an internal structure of the whole electric wheel hub is more compact and the external volume is smaller.

Description

technical field [0001] The invention relates to an electric wheel hub. Background technique [0002] The electric hub is the core component of an electric bicycle. It usually consists of a main shaft, a hub shell, a motor, a planetary gear reduction mechanism and a clutch. The motor mainly adopts a brushless DC motor with an inner stator and an outer rotor structure. The sun gear on the main shaft is fixed on the rotor, and the sun gear is meshed with a planetary gear. It is installed on the planetary shaft through bearings, the planetary shaft is fixed on the clutch, and the clutch is fixed on the main shaft. In addition, in the current electric hub, a speed sensor for detecting the motor speed is usually installed on the outside of the hub shell, and the speed sensor is connected to the motor controller installed outside the hub through a lead wire, so as to meet the wireless transmission control requirements of the motor. [0003] However, the disadvantages of the above...

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantages of the above-mentioned existing electric hubs are that the volume is large and the structure is not compact enough. The reason is that most of the planetary gears in the planetary gear reduction mechanism adopt a single gear with a large outer diameter. To be able to effectively engage with it, the inner diameter of the inner ring gear must be increased, and the size of the entire hub shell must also be increased accordingly, which results in a larger gap between the inner wall of the hub shell and the motor, which naturally leads to the overall The structure of the hub is not compact and the volume becomes larger

And because the current electric hub structure is not compact enough, if motor controllers, batteries and other components are added to the hub shell, it will undoubtedly make the entire hub appearance more bloated

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