Protruded Bar Guiding Structure for Linear Transmission Friction Reduction
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Solution Overview
Problem
Conventional rolling member guiding structures in linear transmission mechanisms face issues with dimensional deviations, high frictional resistance due to large contact areas, and complex fabrication processes, leading to instability and potential blockage of the rolling member's motion.
Innovation Solution
A guiding structure with a protruded design featuring a circular or multi-edged profile is introduced to minimize contact area, using a bar structure with multiple contact points to reduce friction and stabilize the rolling member's direction, fabricated using common injection molding or bending processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recessed arcuate profile is used to guide the rolling member, then the rolling member can circulate in the linear transmission mechanism, but the contact area between the rolling member and the guiding structure is large resulting in high frictional resistance
Solution Approach 1:
The patent inverts the conventional recessed guiding structure into a protruded guiding structure. Instead of having the guiding structure recessed into the sliding block with an arcuate profile, the invention uses a protruding bar structure with circular or multi-edged profile that extends into the circulation tunnel. This inversion minimizes the contact area between the guiding structure and the rolling member, thereby reducing frictional resistance while maintaining circulation stability.
Solution Approach 2:
The patent employs a bar structure with circular or multi-edged profile (curved geometry) as the guiding element. This curved profile allows the bar to contact the rolling member at minimal points rather than along an extended arcuate surface, reducing the contact area and frictional resistance while still providing effective guidance for the rolling member's circulation.
2Force
If a protruded bar structure with circular or multi-edged profile is used to minimize contact area, then frictional resistance is reduced, but the ability to control the rolling member's direction may be compromised
Solution Approach 1:
The patent applies local quality by designing the bar structure with specific geometric profiles (circular or multi-edged) at the guiding surface that create optimal contact characteristics. The bar's profile is specifically engineered to contact the rolling member at discrete points or edges rather than along a continuous surface, providing sufficient directional control while minimizing friction. The local geometry of the bar's surface is optimized to balance guidance function with friction reduction.
3Device complexity
If an integrally formed one-piece guiding structure is used, then the structure is simple, but the injection molding process is required due to complicated structure causing strict allowable dimensional deviation
Solution Approach 1:
The patent segments the guiding structure into a separate bar component that can be independently manufactured and then assembled into the sliding block. This segmentation allows the bar to be produced using simpler processes (such as bending or standard molding) without the complex injection molding requirements of an integrally formed structure, thereby reducing dimensional deviation while maintaining structural simplicity.
4Manufacturing precision
If a two-piece or multi-piece circulation guiding structure is used, then shrinking deformation is reduced, but the coupling and precise mating of multiple parts becomes difficult
Solution Approach 1:
The patent merges the guiding function into a single bar structure component that can be manufactured as one piece using simpler processes. This merging eliminates the need to couple and precisely mate multiple semi-circular tube parts or other multi-component structures, thereby reducing assembly complexity and potential mating errors while maintaining the benefits of reduced shrinking deformation through the simplified manufacturing process.
Data Source
AI summary
A rolling member guiding structure installed in the circulation tunnel of a sliding block in a linear transmission mechanism. The guiding structure has a bar shaped part disposed along the inner wall of the circulation tunnel of the sliding block so as to form the inner cavity of the circulation tunnel into a predetermined guiding space thereby guiding the rolling members to circulate along the circulation tunnel heading to a predetermined direction. With this structure, the contact area between the rolling member and the circulation tunnel can be minimized so as to reduce the frictional resistance to the rolling member and smooth the operation of the linear transmission mechanism.