Motorized Wheel Stator Casing Interference Fit Assembly
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Solution Overview
Problem
Current motorized wheels for machines like floor scrubbers and industrial sweepers require complex and costly assembly processes due to the need for precise fixing of metallic stator casings, which limits component reduction and adaptability to different assembly spaces.
Innovation Solution
The motorized wheel design features a stator casing inserted into a complementarily shaped annular portion of the fixing bracket via interference fitting, eliminating the need for screws and allowing for adjustable axial volume and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator casing is fixed to the bracket by means of threaded elements (screws), then the stator casing can be securely attached, but the assembly process becomes complex and time-consuming with additional components required
Solution Approach 1:
The patent merges the stator casing directly with the bracket by making the stator casing as an integral part of the bracket structure. The stator casing is formed as a continuation of the bracket's annular portion, eliminating the need for separate fastening elements like screws or threaded elements. This integration reduces component count and simplifies assembly while maintaining secure attachment through the interference fit between the stator casing's outer cylindrical surface and the bracket's annular portion.
Solution Approach 2:
The patent extracts and eliminates the threaded elements (screws, bolts, or other fastening components) from the assembly. By removing these separate fastening components, the design achieves a simpler structure that relies on the interference fit between the stator casing and bracket rather than requiring additional fastening hardware, thereby reducing both component complexity and assembly steps.
2Reliability
If the stator casing is fixed to the bracket by means of threaded elements, then secure attachment is achieved, but assembly time and labor costs increase
Solution Approach 1:
The stator casing is merged with the bracket as an integral structure, where the stator casing forms a continuous extension of the bracket's annular portion. This integration allows the stator casing to be attached to the bracket through a single interference fit operation rather than requiring multiple steps of positioning and fastening with threaded elements, significantly reducing assembly time and labor requirements while maintaining secure attachment.
Solution Approach 2:
The bracket is designed with a pre-formed annular portion that has a slightly larger diameter than the stator casing's outer cylindrical surface. This preliminary design feature enables the stator casing to be pressed into place during assembly, with the interference fit automatically providing secure attachment without requiring additional fastening operations or specialized assembly tools, thereby reducing assembly time.
3Reliability
If the stator casing is fixed to the bracket by means of threaded elements, then the connection is secure, but the axial volume cannot be easily modified to adapt to different assembly spaces
Solution Approach 1:
The stator casing is merged with the bracket as an integral structure, allowing the axial volume and curvature of the motorized wheel to be easily modified by adjusting the geometry of the bracket's annular portion and the stator casing's outer cylindrical surface. This integration provides design flexibility to adapt to different assembly spaces and curvature requirements without compromising the secure connection, as the interference fit can be maintained while varying the axial dimensions.
Solution Approach 2:
The design allows for dynamic adjustment of the axial volume and curvature by modifying the dimensions of the stator casing and bracket's annular portion. The interference fit mechanism remains effective across different dimensional configurations, enabling the motorized wheel to be adapted to various assembly spaces and curvature requirements while maintaining secure connection through the same fundamental attachment principle.
4Reliability
If the stator casing is made of metallic material with precise cylindrical geometry for magnetic flux containment, then magnetic flux containment is improved, but the stator casing cannot be deformed to be fixed directly to the bracket
Solution Approach 1:
The patent applies parameter changes by creating a controlled interference fit between the stator casing's outer cylindrical surface and the bracket's annular portion. The stator casing is designed with a slightly smaller diameter than the annular portion, creating a press-fit connection. This parameter change allows the rigid metallic stator casing to be securely attached to the bracket without requiring deformation of the stator casing itself, maintaining both magnetic flux containment and ease of manufacture.
Solution Approach 2:
The patent utilizes thermal expansion principles in the interference fit design. During assembly, the bracket's annular portion or the stator casing is heated to cause thermal expansion, allowing the stator casing to be inserted into the annular portion. Upon cooling, the material contracts, creating a tight interference fit that securely attaches the stator casing to the bracket without requiring deformation of the stator casing, thereby maintaining both magnetic flux containment and manufacturing ease.
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 solution reduces component costs and assembly time, enables better centering of rotation rate reduction means, and allows for lighter and more versatile motorized wheel designs with flexible curvature adjustments.
Implementation Method 1
said stator casing is inserted in a corresponding complementarily shaped annular portion that extends from said bracket and is fixed thereto by interference
Data Source
Figure 1
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AI summary
A motorized wheel (10), of the type comprising an electric motor (11) supported by a fixing bracket (12), adapted to support rotationally, by way of means (13) for reducing the rotation rate, an internally hollow wheel (14) that is contoured to contain at least partly said electric motor (11) and said rotation rate reduction means (13), said electric motor (11) comprising a stator casing (15), a dome (16) and a rotor which is internal to the stator casing (15), the stator casing (15) being inserted in a corresponding complementarily shaped annular portion (18) that extends from the bracket (12) and is fixed thereto by interference.