Linear Guide Layout Combining Rolling and Sliding Bodies
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Solution Overview
Problem
Conventional linear guides for pull-out tables in transport means face issues with ease of movement, stability under asymmetric loading, and unintended displacement due to acceleration forces, leading to potential tilting and instability, especially in constrained spaces like aircraft cabins.
Innovation Solution
A linear guide design featuring a combination of rolling and sliding bodies in each running track, where rolling bodies are arranged on both sides of sliding bodies, providing initial resistance and improved stability against tilting, while maintaining ease of movement and low noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ball-mounted telescopic guides are used to ensure high level of comfort of movement, ease of movement and smooth displacement, then ease of movement is improved, but the pull-out table starts to move unintentionally under braking and acceleration forces due to very easy moveability
Solution Approach 1:
The linear guide is segmented into multiple running tracks, each containing multiple rolling bodies and sliding bodies arranged in sequence. This segmentation allows the system to distribute loads across multiple contact points, providing both smooth movement and stability under acceleration forces.
Solution Approach 2:
Different regions of the running track have different properties: rolling bodies provide low-friction movement in the displacement direction, while sliding bodies provide high-friction stability against perpendicular acceleration forces. This local differentiation of friction characteristics resolves the contradiction between ease of movement and stability.
2Reliability
If sliding guides are used to remain stably in position under horizontally acting forces due to braking and acceleration, then stability under acceleration forces is improved, but asymmetric loading causes tilting of the sliding guides resulting in the slipstick effect
Solution Approach 1:
The guide is divided into multiple running tracks with multiple sliding and rolling bodies. This segmentation prevents tilting under asymmetric loading by distributing forces across multiple contact points, eliminating the slipstick effect while maintaining stability.
Solution Approach 2:
The invention merges rolling bodies and sliding bodies within the same running track. The rolling bodies provide ease of movement, while the sliding bodies provide stability under acceleration forces. This combination resolves the contradiction between ease of operation and reliability.
3Ease of manufacture
If simple sliding guides with pull-out stops are used, then manufacturing cost is reduced, but the pull-out table does not provide a pleasant feel sensation and has higher noise
Solution Approach 1:
The linear guide uses rolling bodies (balls or rollers) that dynamically adapt to loading conditions, providing smooth movement and pleasant feel sensation. This dynamic behavior improves user experience while maintaining reasonable manufacturing costs through standardized components.
4Ease of operation
If conventional steel telescopic rails are used to ensure comfortable displacement behavior, then ease of operation is improved, but the weight increases significantly
Solution Approach 1:
The invention changes the material parameters of the rolling and sliding bodies, using plastics or elastomers instead of conventional steel. This parameter change reduces weight while maintaining comfortable displacement behavior through the inherent damping and friction characteristics of these materials.
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
The solution enhances the reliability and stability of pull-out tables by preventing unintended movement and tilting under asymmetric loading, ensuring a pleasant user experience with reduced noise and increased resistance to external vibrations.
Implementation Method 1
at least one sliding body and at least two rolling bodies are provided in each running track between two rail elements, wherein at least one respective rolling body is arranged on both sides of a sliding body in the longitudinal direction of the running track
Implementation Method 2
rolling bodies and sliding bodies in each running track, where rolling bodies are arranged on both sides of sliding bodies, providing initial resistance and improved stability
Data Source
AI summary
A linear guide (1) having at least two rail elements (2, 2′) which are movable counter to each other in the longitudinal direction, wherein each rail element (2, 2′) has running surfaces (3, 3′) which, together with running surfaces (3, 3′) of a rail element (2, 2′) moveable counter thereto, form tracks (4) for receiving rolling bodies (10) and sliding bodies (11) between the two rail elements which are moveable counter to each other, characterized in that at least one sliding body (11) and at least two rolling bodies (10) are provided in each track (4) between two rail elements (2, 2′), wherein at least one rolling body (10) is arranged in each case on both sides of a sliding body (11) in the longitudinal direction of the track (4).