Linear Motion Bearing Interlock Structure
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Solution Overview
Problem
Existing linear motion bearings face challenges in efficiently distributing load and resisting longitudinal forces due to limitations in ball track design and assembly integrity, particularly in maintaining bearing balls within tracks and resisting outward forces.
Innovation Solution
The design incorporates open axial ball tracks with load and return portions, turnarounds, and hermaphroditic interlock structures on outer housing sleeves to securely hold the ball retainer structure, allowing for enhanced load distribution and resistance to longitudinal forces through a combination of bearing balls and load-bearing plates within a compact assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional closed ball tracks are used, then bearing balls are securely retained, but manufacturing complexity and tolerance requirements increase
Solution Approach 1:
The ball track is divided into two functional segments: an open load-bearing portion and a closed return portion. This segmentation allows the load-bearing area to be accessible and easier to manufacture, while the return portion maintains ball retention. The track is not fully closed, reducing manufacturing complexity while preserving reliability through strategic opening of only the necessary portion.
Solution Approach 2:
Different portions of the ball track have different structural qualities - the load-bearing portion is open to reduce complexity and improve accessibility, while the return portion remains closed to maintain ball retention. This local differentiation of structural properties allows each zone to optimize for its specific function without compromising overall system reliability.
2Strength
If multiple separate components are used for load bearing, then load distribution improves, but assembly complexity increases
Solution Approach 1:
The load-bearing plates are integrated directly with the outer housing sleeves to form a unified load-bearing structure. This merging eliminates separate assembly steps for attaching load-bearing components while maintaining the multi-component load distribution architecture. The integrated design preserves the load capacity benefits of multiple load-bearing surfaces without adding assembly complexity.
3Productivity
If hermaphroditic interlock structures are used on both sleeves, then assembly efficiency improves, but precision requirements increase
Solution Approach 1:
While both sleeves have interlock structures, they are positioned asymmetrically relative to the ball track openings. This asymmetric arrangement allows the interlock features to engage in a sequence that naturally guides alignment during assembly, reducing the precision requirements compared to symmetric interlocking. The asymmetry creates a built-in alignment mechanism that tolerates greater manufacturing variations.
Data Source
AI summary
A linear motion bearing assembly comprising a ball retainer structure having at least a portion of a plurality of open axial ball tracks formed therein. The ball tracks including an open load bearing portion, an open return portion and turnarounds interconnecting the load bearing and return portions. A plurality of bearing balls are disposed in the ball tracks. A plurality of load bearing plates are axially positioned adjacent the ball retainer structure for receiving load from the balls disposed in the load bearing portion of the ball tracks. A first outer housing sleeve is effective to hold the ball retainer structure. The first outer housing sleeve includes a first interlock structure. A second outer housing sleeve is effective to hold the ball retainer structure, the second outer housing sleeve including a second interlock structure. The first interlock structure is effective to mate with the second interlock structure.