Linear Motion Guide Unit Pinion Anti-Sliding Mechanism
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Solution Overview
Problem
Conventional linear motion guide units experience position variations of the roller cage assembly due to sliding motions between guide rails, which can lead to reduced load support and compromised smooth operation, necessitating a reduction in the number of rollers to prevent sliding.
Innovation Solution
A linear motion guide unit design featuring ring-shaped pinions surrounding rollers, with pinions mounted on a cage plate and engaged with guide rails, and rack members with elastic fixing protrusions to prevent sliding while maintaining the number of rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional linear motion guide unit is used, then the structure is simple, but the roller cage assembly experiences position variation due to sliding motions between guide rails
Solution Approach 1:
The pinion is nested within the roller cage assembly, with the pinion shaft positioned inside the cage. The pinion teeth engage with rack teeth on the guide rails from the interior, allowing the anti-sliding mechanism to be integrated into the existing roller cage structure without adding external components.
Solution Approach 2:
The pinion acts as an intermediary mechanism between the roller cage assembly and the guide rails. Through the engagement of pinion teeth with rack teeth, it converts the sliding motion problem into a controlled mechanical interaction that prevents position variation while maintaining smooth operation.
2Reliability
If the number of rollers is reduced to accommodate anti-sliding mechanisms, then the device complexity is reduced, but the load support capability decreases
Solution Approach 1:
The anti-sliding function is merged with the existing roller cage assembly structure. The pinion is integrated into the cage assembly and works cooperatively with the rollers, which continue to provide load support. This combination allows both functions (load support and anti-sliding) to be achieved without reducing the number of rollers.
Solution Approach 2:
The roller cage assembly is designed to serve multiple functions simultaneously: the rollers provide load support and smooth motion, while the integrated pinion provides anti-sliding capability. This multi-functionality ensures that the same structural components perform both load-bearing and position-stabilizing roles.
3Reliability
If pinions are positioned outside the roller cage assembly, then the anti-sliding mechanism is simpler to implement, but the device complexity increases and space is consumed
Solution Approach 1:
The pinion is nested within the roller cage assembly, utilizing the internal space of the cage structure. The pinion shaft is positioned inside the cage, and the pinion teeth engage with the rack teeth on the guide rails from the interior, eliminating the need for additional external space.
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
Prevents position variations and maintains load support by allowing rollers to maintain their number, ensuring smooth operation and extended lifespan without the need for reducing the number of rollers.
Implementation Method 1
ring-shaped pinions adapted to surround the rollers... allowing for engagement with rack members to prevent sliding
Implementation Method 2
a roller cage assembly disposed between the first and second guide rails and having a plurality of rollers located between the first and second guide rails
Data Source
AI summary
A linear motion guide unit is provided, which is capable of preventing the variation in the position of a roller cage assembly caused by sliding motions of the roller cage assembly between a first guide rail and a second guide rail, without reducing the number of rollers. The linear motion guide unit includes first and second guide rails having track portions formed concavedly to have a V-shaped section on the faces opposing each other; and a roller cage assembly disposed between the first and second guide rails and having a plurality of rollers located between the first and second guide rails and ring-shaped pinions adapted to surround the rollers.