Inside Seal for Linear Motion Guide Unit
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Solution Overview
Problem
Modern linear motion guide units face challenges in maintaining the integrity of load-carrying races against foreign materials and contaminants, especially in harsh environments, due to insufficient sealing performance and the need for compact construction, which existing solutions fail to address effectively.
Innovation Solution
A linear motion guide system with an inside seal composed of a metallic core and sealing members, featuring lugs and lips for engagement with end caps and the guide rail, ensures effective sealing by preventing foreign materials from entering the load-carrying races while allowing smooth sliding contact and easy installation, maintaining the compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dustproof means (telescopic cover, bellows) are used to protect against foreign materials, then sealing performance is improved, but device complexity and installation cost increase
Solution Approach 1:
The invention extracts the sealing function from external dustproof means (telescopic covers, bellows) and relocates it inside the slider through the inside seal. The seal member is positioned within the slider body, specifically in a recessed area, to directly prevent foreign materials from entering the circulating circuit without requiring external protective structures.
Solution Approach 2:
The inside seal is nested within the slider structure, with the seal member housed in a recessed area of the slider body. This nested configuration allows the sealing function to be integrated into the existing slider geometry, eliminating the need for separate external dustproof components while maintaining compact construction.
2Object-affected harmful factors
If telescopic covers or bellows are installed to prevent foreign material entry, then protection against contaminants is improved, but installation cost and complexity increase
Solution Approach 1:
The sealing function is extracted from expensive external dustproof means and implemented through a simpler inside seal mechanism integrated into the slider. The seal member, positioned within the slider's recessed area, provides effective protection against foreign materials without requiring costly telescopic covers or bellows installations.
3Device complexity
If the guide rail is laid bare to maintain compact construction, then device complexity is reduced, but foreign materials can enter the circulating circuit
Solution Approach 1:
The inside seal is nested within the slider structure, with the seal member housed in a recessed area that faces the guide rail. This nested configuration maintains the compact construction by keeping the sealing mechanism integrated into the slider body, while the seal member effectively prevents foreign materials from entering the circulating circuit through the recessed area.
4Reliability
If an inside seal is installed to prevent foreign material entry, then protection of load-carrying races is improved, but device complexity increases
Solution Approach 1:
The inside seal applies local quality by concentrating the sealing function in a specific recessed area of the slider body that directly faces the guide rail. Rather than implementing a complex sealing system throughout the entire slider, the seal member is strategically positioned only where foreign materials would enter the circulating circuit, providing targeted protection with minimal structural complexity.
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 materials from entering the load-carrying races, ensuring prolonged service life and smooth operation in severe environments, while being cost-effective and compact in design.
Implementation Method 1
there is provided a lip-type seal having a first lip coming into sliding engagement with a top surface of the guide rail to prevent foreign materials against creeping into the load-carrying race along the top surface of the guide rail
Data Source
AI summary
An inside seal is installed in a recess open downward in the slider to keep load-carrying races kept free of foreign materials that have already crept into the inside of the slider. The inside seal is composed of a metallic core and a sealing member that includes a joint portion secured to the core and a major portion integral with the joint portion. The joint portion has a mating surface to come into engagement with a downward surface deep inside the recess cut in a carriage while the major portion includes a first lip to come into sliding engagement with a guide rail, a second lip come into abutment against an inward sidewall of the recess, and third lip to come into abutment against the downward surface.