High-speed cantilever type hub motor of mobile platform

Abstract

The invention discloses a high-speed cantilever type hub motor of a mobile platform. The high-speed cantilever type hub motor comprises a hub shell taking a cantilever shaft as a rotating axis, and a machine core shell, a machine core and a planetary speed reducing mechanism which are arranged in the hub shell, wherein the machine core shell is fixed at the front end of the cantilever shaft, the machine core is of a structure with an outer stator and an inner rotor, shaft teeth are arranged at the front end of a mandrel in the center of the rotor and are meshed with a planetary gear in the planetary speed reducing mechanism through helical teeth, and the planetary gear is meshed with an inner gear ring arranged on the inner wall of the hub shell. The high-speed cantilever type hub motor is characterized in that the mandrel is supported and assembled in the machine core shell by a front mandrel bearing and a rear mandrel bearing, a front shaft shoulder and a rear shaft shoulder are formed on the mandrel, the front end of the front shaft shoulder abuts against the inner wall of the front end of the machine core shell through the front mandrel bearing, the rear end of the rear shaft shoulder abuts against the rear mandrel bearing, an axial gap is reserved between the rear end of the mandrel and the inner wall of the rear end of the machine core shell, and a corrugated pad is arranged between the rear mandrel bearing and the inner wall of the rear end of the machine core shell. The high-speed cantilever type hub motor can reduce the axial force borne by the mandrel and the mandrel bearings, reduce the loss of the mandrel and the mandrel bearings, and improve the working reliability of the hub motor.

Description

technical field [0001] The invention relates to a high-speed cantilever hub motor for a mobile platform. Background technique [0002] In the prior art, the mobile platform is widely used in various fields of industry and life due to its flexible and stable movement and high steering precision. Robots perform production operations; another example is golf courses, which are usually equipped with golf carts with mobile platforms as travel mechanisms. [0003] At present, the core driving components of this mobile platform are the hub motors on both sides, and most of them are cantilever hub motors. The main structure of such a cantilever hub motor usually includes a cantilever shaft, a hub shell, a core shell, a core and a planetary reduction mechanism. The front end of the cantilever shaft fixes the movement casing, and the front end of the movement casing fixes the support again, and the two ends of the hub casing are respectively assembled on the cantilever shaft and the...

AI Technical Summary

Problems solved by technology

The meshing structure of the helical teeth will cause the core shaft to be axially displaced due to axial force, but the core shaft of the existing cantilever hub motor is designed to contact the core shaft bearing through the shoulder on it, and then to contact with the core shaft bearing. The assembly between the bearing recesses on the movement casing completes the axial limit and locking, which causes large gaps between the mandrel and the mandrel bearing, as well as between the mandrel bearing and the movement case, when the motor runs at high speed. If things go on like this, the wear of the mandrel and the mandrel bearing will be accelerated, which will cause the instability of the internal mechanism of the motor and generate noise. In severe cases, the entire motor will even be scrapped.

[0005] In particular, most of the current mobile platform hub motors are forward and reverse motors, and forward rotation and reverse rotation will further cause the spindle to be subjected to axial forces in two directions, and the magnitudes of these two axial forces are different, which is Further amplifies the force deviation on the mandrel

The result is that the extrusion force on the mandrel and the mandrel bearing on it is more frequent and larger, which makes the component wear more serious and the life is lower, which greatly reduces the working reliability and stability of this type of cantilever hub motor , so it is urgent to improve

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