Roller Unit Fastening Structure to Prevent Shaft-Wheel Separation
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Solution Overview
Problem
Conventional roller units require specific retainers to prevent separation of the wheel and support shaft, leading to high manufacturing costs and potential separation due to corrosion, especially at coupling points.
Innovation Solution
A roller unit design featuring a supporting shaft with multi-step flanges and a washer or fixing body that surrounds and secures the second flange, preventing separation by using coupling protrusions or a ring-shaped reinforcing member to reduce friction and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific retainer is used to prevent separation of the wheel and support shaft, then the reliability of the roller unit is improved, but the manufacturing cost increases
Solution Approach 1:
The patent integrates the fastening function directly into the support shaft by forming a deformation portion through plastic deformation of the shaft itself, eliminating the need for a separate retainer component. This merging of functions reduces part count and manufacturing cost while maintaining the reliability of preventing wheel separation.
Solution Approach 2:
The support shaft performs its own fastening function by utilizing its material properties - the deformation portion is created through plastic deformation of the shaft material itself, allowing the shaft to serve both as a structural support and as a fastening mechanism, eliminating dependency on external retainers.
2Ease of manufacture
If plastic deformation is used to couple the wheel and support shaft, then the ease of manufacture is improved, but corrosion occurs at the coupling portion leading to separation
Solution Approach 1:
The patent applies local quality by creating a deformation portion with specific geometric characteristics at a localized region of the support shaft. The deformation portion has a controlled cross-sectional area and shape that concentrates the coupling function in a specific location, allowing plastic deformation to be applied locally without compromising the overall structural integrity and corrosion resistance of the entire shaft.
Solution Approach 2:
The patent effectively creates a composite structure by combining the deformed portion (with altered material properties due to plastic deformation) with the rest of the support shaft (maintaining original material properties). This composite approach allows the deformed region to provide mechanical interlocking while the undisturbed shaft regions maintain their corrosion resistance and structural strength.
3Adaptability or versatility
If multiple separate components are used for the roller unit, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the support shaft by integrating the fastening function through the deformation portion. This reduces the total number of components while maintaining design flexibility, as the support shaft itself becomes a multi-functional element that provides both structural support and mechanical coupling.
Solution Approach 2:
The support shaft is designed as a multi-functional component that simultaneously serves as a structural support, a mounting element for the wheel, and a fastening mechanism through its deformation portion. This universal design reduces component count while maintaining the adaptability needed for various roller unit configurations.
Data Source
AI summary
A roller unit having an integrated fastening portion includes a supporting shaft fastened to a containing body or a containing main body that can slide and having first and second flanges formed in multi steps with different outer diameters, a rotating body rotatably fixed to a side of the supporting shaft, and a washer coupled to a side of the rotating body to surround and fix the second flange, thereby preventing separation of the supporting shaft and the rotating body. Therefore, it is possible to more conveniently combine the supporting shaft and the rotating body and to prevent separation of the supporting shaft and the rotating body, whereby is possible to improve various functions.