Double-Rail Plain Bearing Structure for Easier Precision Mounting
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Solution Overview
Problem
Existing linear plain bearings with double rails and carriages face structural complexity and high mounting efforts due to manufacturing tolerances and dimensional inaccuracies, leading to increased production costs and reduced ease of assembly.
Innovation Solution
A single-piece double rail design with one rail element forming a guide unit and another forming a supporting guide, allowing for lower parallelism demands and accommodating dimensional deviations, combined with material pairings for reduced friction and the use of plain bearing elements for low-friction sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-piece double rail design is used, then manufacturing complexity and mounting effort are reduced, but manufacturing precision and parallelism control become more difficult
Solution Approach 1:
The single-piece double rail is divided into two functional segments: one rail element forms a guide unit with one linear guide element to provide precise lateral guidance, while the other rail element forms a supporting guide with the other linear guide element to accommodate loads orthogonal to the rail plane. This segmentation allows each segment to have optimized tolerance requirements, reducing overall manufacturing complexity while maintaining precision where needed.
2Manufacturing precision
If tight manufacturing tolerances are applied to both rail elements, then guidance precision is improved, but manufacturing costs and complexity increase
Solution Approach 1:
Different tolerance levels are applied to different functional segments of the double rail. The guide unit (one rail element and its corresponding linear guide element) receives tight tolerance control to ensure precise lateral guidance, while the supporting guide (other rail element and its corresponding linear guide element) can accommodate larger tolerances since its primary function is load bearing rather than precision guidance. This local differentiation of quality requirements reduces overall manufacturing complexity while maintaining guidance precision.
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
This design simplifies manufacturing, reduces costs, and enhances assembly efficiency while maintaining low-friction and low-wear performance, allowing for reliable and easy mounting of working devices.
Implementation Method 1
a play-free or low-play sliding guiding is provided by means of the guide unit
Implementation Method 2
The supporting guide, which is formed of the second rail element and the second linear guide element, substantially makes it possible to accommodate a load in a direction running orthogonal to the rail plane
Data Source
AI summary
A linear plain bearing (1) includes a rail (2) and a carriage (3, 41) with a complementary linear guide (4) which cooperates with the rail (2). The rail (2) is formed as a single-piece double rail (5, 40) with two parallel rail elements (6, 7, 42, 43) in a rail plane (8) and the linear guide (4) of the carriage (3, 41) has two parallel linear guide elements (9, 10) fitting the double rail (5, 40). A first of the rail elements (6, 42) and a first of the linear guide elements (9) form a guide unit (11), where a play-free or low-play sliding guiding is provided by the guide unit (11), and the second rail element (7) with the second linear guide element (10) forms a supporting guide (12).