Motorized Wheel Structure Asymmetrical Coupling
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Solution Overview
Problem
Existing motorized wheel structures face high production costs, labor-intensive assembly, reduced precision in coupling, increased noise, and wear due to complex fastening methods and interference fitting, which can damage delicate components.
Innovation Solution
A motorized wheel design featuring a removably coupled motor reduction unit, fixing bracket, and motor unit with asymmetrical centering and fixing seats, and threaded holes for precise alignment and secure fastening, eliminating the need for grinding and reducing assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stator case is coupled to the fixing bracket by inserting it in an annular portion with interference fitting, then the coupling precision between motor reduction unit and motor unit is improved, but the external surface of the fixing bracket deforms requiring additional grinding operations
Solution Approach 1:
The invention divides the fixing bracket into two separate functional parts: an annular portion for interference fitting with the stator case, and a flat external surface for bearing mounting. This segmentation allows each part to perform its specific function without compromising the other, eliminating the need for post-grinding operations while maintaining high coupling precision.
Solution Approach 2:
The invention introduces a dedicated annular portion as an intermediary structure between the fixing bracket and the stator case. This annular portion specifically handles the interference fitting function, preventing deformation from affecting the external surface that requires precision for bearing installation.
2Manufacturing precision
If interference fitting is used to couple the stator case to the fixing bracket, then coupling precision is improved, but delicate components such as windings may be damaged
Solution Approach 1:
By segmenting the fixing bracket into an annular portion and a separate mounting surface, the interference fitting forces are localized to the annular portion, preventing stress transmission to delicate components like windings on the motor shaft.
Solution Approach 2:
The annular portion serves as a mediator that absorbs and isolates the interference fitting stresses, protecting the stator case and motor components from damage while still achieving precise coupling.
3Ease of operation
If a cap and threaded elements are used to secure the stator case to the fixing bracket, then assembly is simplified, but production costs and assembly time increase significantly
Solution Approach 1:
The invention extracts the fastening function from the design by making the stator case integrally coupled to the fixing bracket through interference fitting of the annular portion, eliminating the need for separate caps and threaded elements, thereby reducing assembly steps and production costs.
4Ease of operation
If the motor reduction unit and motor unit are coupled using the annular portion of the fixing bracket, then assembly is simplified, but coupling precision decreases leading to increased noise and wear
Solution Approach 1:
The invention segments the coupling function by dedicating the annular portion specifically to precision interference fitting with the stator case, while the flat external surface provides a stable mounting area for the motor reduction unit bearing, ensuring both precision and ease of assembly.
Data Source
AI summary
Motorized wheel structure includes a motor unit equipped with a stator case, a motor reduction unit operatively connected to the motor unit, and a fixing bracket for fastening the motorized wheel structure to an external device. The motorized wheel structure envisages that the motor reduction unit is equipped at one own end with a substantially circular coupling seat in which a first coupling area and a second coupling area are defined, the fixing bracket is equipped with an annular portion removably coupled in correspondence with the first coupling area of the coupling seat and the stator case is installed passing through the annular portion of the fixing bracket and is removably coupled in correspondence with the second coupling area of the coupling seat.