Linear Guide With Rolling And Sliding Bodies For Stability
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Solution Overview
Problem
Linear guides for pull-out tables in means of transport face challenges such as unintentional movement due to smooth running, sensitivity to asymmetrical loading, and difficulty in maintaining stability during braking and acceleration, as well as high production costs and complexity in assembly and repair.
Innovation Solution
A linear guide design featuring a combination of rolling and sliding bodies, where at least one sliding body is surrounded by rolling elements on both sides, providing initial resistance and stability against tilting and unintentional movement, while allowing smooth operation and easy assembly, with optional latching devices for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ball-bearing telescopic guides are used to ensure smooth running and ease of movement, then the pull-out table moves smoothly with high comfort, but the pull-out table moves unintentionally under horizontal forces during braking and acceleration, causing objects to fall
Solution Approach 1:
The linear guide dynamically adapts its friction characteristics through the combination of rolling elements for smooth movement and sliding elements that engage under load to provide stabilization during acceleration and braking, allowing the system to transition between different operational states
2Stability of the object's composition
If sliding guides are used to maintain stability during braking and acceleration due to higher static friction, then position stability is improved, but asymmetrical loading causes the sliding guides to jam, making the table difficult or impossible to move
Solution Approach 1:
The linear guide uses a composite system combining rolling elements (balls) and sliding elements (cylindrical or conical) within the same guide structure, allowing the system to leverage the advantages of both: smooth rolling movement under normal conditions and stable friction-based positioning when needed
Solution Approach 2:
The guide system is segmented into multiple functional components: rolling elements for primary movement, sliding elements for stabilization, and limiters for position control, allowing each segment to perform its specific function without interfering with others
3Ease of operation
If conventional steel telescopic rails are used to achieve comfortable travel behavior, then smooth running is improved, but the components become heavy, increasing overall weight
Solution Approach 1:
The design changes the material parameters and structural configuration of the rail elements, using optimized profiles and materials that maintain the necessary mechanical properties for smooth operation while reducing the overall mass compared to conventional steel telescopic rails
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 stability and security against unintentional movement, maintains smooth operation, and reduces the risk of jamming under asymmetrical loading, while being cost-effective and easy to assemble, with a pleasant user experience and reduced noise.
Implementation Method 1
tracks for receiving rolling elements and sliding bodies between the two rail elements that can be moved in relation to one another
Implementation Method 2
the ease of movement of the ball-bearing linear guides also represents a disadvantage for use in the special application for pull-out tables in means of transport... With very smooth-running ball-bearing linear guides, the pull-out table also moves unintentionally, so that objects placed on it, such as drinks, are not stored stably
Data Source
Figure 1~2
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Figure 4
AI summary
A linear guide (1) having at least two rail elements (2, 2') which are moveable 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).