Linear Guide Anti-Creep Retainer Without Raceway Groove Weakening
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Solution Overview
Problem
Existing limited-stroke linear guides face issues with reduced rigidity and load capacity due to the placement of toothed wheels and racks within the raceway grooves, which compromises the integrity of the guide rails.
Innovation Solution
The design incorporates first and second protrusions on opposite sides of the rails, which mesh with a rotatable toothed wheel to prevent creep, while maintaining the integrity of the raceway surfaces, thus enhancing the rigidity and load capacity of the guide rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the toothed wheel and rack are placed within the raceway groove to prevent retainer creep, then the anti-creep function is achieved, but the rigidity and load capacity of the guide rail are reduced
Solution Approach 1:
The patent divides the guide rail structure into two separate functional zones: the raceway groove area dedicated to rolling element movement, and the flange area with toothed grooves for anti-creep function. This segmentation allows each zone to optimize its specific function without compromising the other, resolving the contradiction between anti-creep reliability and structural strength.
Solution Approach 2:
The invention moves the toothed grooves from the two-dimensional raceway groove surface to the three-dimensional flange structure of the guide rail. By utilizing the flange dimension, the anti-creep mechanism is established outside the critical raceway area, preventing interference with the rolling element path and maintaining raceway integrity while achieving creep prevention.
2Reliability
If the toothed groove is formed in the raceway groove for engagement of the toothed wheel, then the meshing engagement is achieved, but the integrity of the raceway surface is compromised
Solution Approach 1:
The patent extracts the toothed groove feature from the raceway groove and relocates it to the flange structure. This extraction separates the meshing engagement function from the raceway surface, allowing the raceway to maintain its complete integrity and smooth continuous surface while the flange provides the toothed engagement features for creep prevention.
3Reliability
If the external rack is secured in the groove through the rack fastener, then the anti-creep mechanism is established, but the rigidity of the guide rail is reduced and vibrations occur
Solution Approach 1:
The patent merges the anti-creep mechanism directly into the guide rail structure by forming toothed grooves on the flange surface. This integration eliminates the need for separate external racks and fasteners, creating a unified structure where the guide rail itself provides both support and anti-creep functionality, thereby maintaining maximum rigidity while preventing vibrations.
4Ease of operation
If the gear and rotating shaft are exposed on the top surface of the guide rail, then the toothed wheel mechanism is accessible, but oil and dust easily get stuck causing unsmooth rotation
Solution Approach 1:
The patent nests the toothed wheel and toothed grooves within the flange structure of the guide rail, creating a semi-enclosed configuration. This nesting protects the meshing surfaces from direct exposure to external contaminants while maintaining functional accessibility, reducing the accumulation of oil and dust that would otherwise cause unsmooth rotation.
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 configuration improves the rigidity and load-bearing capacity of the guide rails by maintaining the integrity of the raceway surfaces and preventing the loosening of protrusions, while minimizing the impact of oil and dust on the toothed wheel.
Implementation Method 1
The rolling elements roll on the raceway surfaces and bear the load
Implementation Method 2
The toothed wheel meshes with the plurality of protrusions planted sequentially in the motion direction of rails to prevent the retainer from creeping on the rails
Data Source
AI summary
A linear guide includes a first rail, a second rail, and a retainer. The first rail has a first opposite side facing a second opposite side of the second rail. The first opposite side has a first raceway surface. The second opposite side has a second raceway surface. The retainer includes a plurality of rolling elements roll on the first raceway surface and the second raceway surface. A rotatable toothed wheel is pivotally connected to the retainer. A plurality of first protrusions are planted at equal intervals on the first opposite side other than the first raceway surface. A plurality of second protrusions are planted at equal intervals on the second opposite side other than the second raceway surface. The toothed wheel meshes with the first protrusions and the second protrusions to prevent the retainer from creeping on the first rail and the second rail.