Motion Guide Seal Design for Foreign Matter Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In motion guide devices, gaps between end seals and inner seals or side seals can occur due to processing tolerances, allowing foreign matters to enter the load ball path and impair movement accuracy by causing abrasion or damage to the rolling surfaces.
Innovation Solution
A motion guide device with extended seal portions that protrude from the fixing substrate of the second seal member, compressing against the first seal members to eliminate gaps and prevent foreign matter entry, ensuring smooth motion and preventing abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of end seals and inner seals are mounted to the moving block to prevent foreign matters from entering, then the reliability of the motion guide device is improved, but gaps may be generated between the seal members due to processing tolerances, allowing foreign matters to enter
Solution Approach 1:
The patent employs flexible seal members (end seals and inner seals) with elastic properties that can deform to fill gaps caused by processing tolerances. The seal members are made of elastomeric materials that conform to the track rail surface and mating seal members, eliminating gaps without requiring ultra-precise manufacturing. This flexible sealing approach maintains reliability while accommodating normal manufacturing variations.
Solution Approach 2:
The patent utilizes the elastic deformation parameter of the seal members to adapt to dimensional variations. By selecting materials with appropriate elastic moduli and designing seal geometries that allow controlled deformation, the system compensates for processing tolerances in the moving block and track rail, ensuring continuous contact between seal members without requiring perfect dimensional accuracy.
2Reliability
If multiple seal members are mounted to prevent foreign matter entry, then the reliability is improved, but the device complexity increases due to multiple sealing components and their installation
Solution Approach 1:
The sealing system is divided into distinct functional segments: end seals mounted on the outer surfaces of the moving block and inner seals mounted on the inner surfaces. This segmentation allows each seal type to address specific sealing needs at different locations, improving overall reliability while maintaining manageable complexity through modular design and standardized installation procedures.
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 effectively prevents foreign matters from entering the load ball path, maintaining movement accuracy and reducing abrasion on the track rail, moving block, and ball surfaces by eliminating gaps between seal members.
Implementation Method 1
a moving block is assembled to a track rail through intermediation of a large number of endlessly circulating rolling elements such as balls and rollers
Implementation Method 2
Each of the end seals includes a seal lip portion that comes into sliding contact with the surface of the track rail, and when the moving block moves along the track rail, the seal lip portion wipes the foreign matters adhering on the track rail off the surface of the track rail
Data Source
AI summary
A motion guide device including a track shaft having a rolling surface; a moving member movable along the track shaft; a first seal member in sliding contact with a surface of the track shaft to close a gap between the track shaft and the moving member; and a second seal member provided along the rolling surface of the track shaft and closes the gap between the track shaft and the moving member. The second seal member includes: a fixing substrate locked to the moving member; and a seal portion fixed to the fixing substrate along the rolling surface of the track shaft and includes a seal lip portion in sliding contact with the surface of the track shaft and an extended seal portion in close contact with the first seal member while being compressed by the first seal member when the first seal member is fixed to the moving member.