Hub Drive Structure With Fixed Stator for Concentric Gear Support
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Solution Overview
Problem
Existing hub drive structures for electric vehicles suffer from insufficient supporting force and poor concentricity, leading to kinetic loss, noise, and increased size and weight, which affect the stability and efficiency of the hub.
Innovation Solution
The hub drive structure fixes the stator of the motor through an internal hood to the hub shaft, ensuring a firm supporting force and improving the concentricity of the gear set, thereby enhancing the initial driving force and reducing kinetic loss and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the stator is not fixed to the hub shaft, then the structure is simpler, but the supporting force is insufficient and kinetic loss increases
Solution Approach 1:
The patent merges the stator and hub shaft into a unified structure by fixing the stator directly to the hub shaft. This combination ensures that the stator rotates together with the hub shaft, providing firm supporting force while maintaining structural integration. The merging eliminates relative motion between these components, preventing kinetic loss and improving force transmission efficiency.
2Manufacturing precision
If the gear set concentricity is poor, then the hub can be larger to accommodate high reduction ratio, but the volume and weight increase
Solution Approach 1:
The patent implements preliminary action by pre-establishing the concentricity of the gear set through precise positioning structures during assembly. The gear set is pre-aligned with the hub shaft using定位 features before final assembly, ensuring high concentricity is achieved without requiring an oversized hub. This preliminary positioning prevents jitter noise and maintains compact dimensions.
3Power
If the stator orientation is unstable, then the initial driving force is reduced, but stabilizing it increases structural complexity
Solution Approach 1:
The patent stabilizes the stator orientation by merging it with the hub shaft through direct fixation. This integration ensures that the stator maintains a fixed orientation relative to the hub shaft during rotation, maximizing the initial driving force. The merging eliminates the need for separate stabilization mechanisms, achieving stability without excessive structural complexity.
4Force
If the hub motor uses inner rotor design, then the moment of inertia is smaller, but the concentricity and supporting force are insufficient
Solution Approach 1:
The patent addresses the concentricity issue in inner rotor design by implementing preliminary positioning structures that pre-align the rotor with the hub shaft. This preliminary action ensures that the rotor maintains accurate concentricity during operation, providing sufficient supporting force while preserving the low moment of inertia advantage of the inner rotor configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively increases the initial driving force of the hub, reduces kinetic loss, improves operation stability by minimizing jitter noise, and reduces the volume of the hub through optimized gear set concentricity.
Implementation Method 1
when the motor is supplied with electrical power to operate a rotor
Data Source
AI summary
A hub drive structure includes an electric machine set, a gear set, an outer rotor input set, and a hub mounted on a hub shaft. The electric machine set includes an internal hood that is fixed through a shaft tube arm to the hub shaft, so that when a motor is supplied with electrical power to operate a rotor to drive the hub, a firm and sound supporting force is obtained to effectively increase the initial driving force of the hub and thus reduce unnecessary kinetic loss, and further, the rotor of the electric machine set and the gear set are coaxially mounted on an output sleeve of the electric machine set to effectively ensure concentricity of the gear set to thereby improve the operation stability thereof and reduce the phenomenon of jitter noise.