Inside Seal for Linear Motion Guide Units
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Solution Overview
Problem
Conventional linear motion guide units lack effective dustproof mechanisms, especially in harsh environments, as they often require costly machining and are prone to seal deformation and displacement due to frictional resistance, leading to foreign material ingress into load-carrying races.
Innovation Solution
The implementation of inside seals with thick bracing portions, tight-contact ends, and elastic members that securely fit into slots in end caps, ensuring close contact with both the end caps and guide rail surfaces to prevent foreign material ingress, even in tight spacing intervals without the need for additional machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional dustproof means (telescopic cover, bellows) are used, then foreign material protection is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent extracts the sealing function from external components (telescopic covers, bellows) and integrates it into the slider structure itself through the inside seal. The seal is mounted within the slider body, eliminating the need for separate external dustproof mechanisms while maintaining protection against foreign materials in harsh environments.
Solution Approach 2:
The inside seal is nested within the slider structure, with the seal body housed inside the slider and the lip extending outward to contact the guide rail. This nested configuration allows the sealing function to be integrated into the existing slider geometry without adding external components, reducing overall device complexity.
2Object-affected harmful factors
If inside seal structure is added between slider and guide rail, then foreign material protection is improved, but machining cost and manufacturing complexity increase
Solution Approach 1:
The inside seal is designed with pre-formed mounting features (flanges, slots, or press-fit structures) that allow installation without requiring complex machining operations on the slider or guide rail. The seal structure is prepared in advance during manufacturing, enabling simple assembly processes that avoid costly custom machining.
Solution Approach 2:
The patent provides multiple embodiments with different mounting configurations (flanged, slotted, press-fit) that can be selected based on manufacturing capabilities and spacing requirements. These parameter variations allow the same sealing function to be achieved through different manufacturing approaches, optimizing for ease of manufacture in each case.
3Volume of moving object
If thin plate seal is used, then device compactness is improved, but seal reliability deteriorates due to deformation and displacement from frictional resistance
Solution Approach 1:
The inside seal incorporates a lip made of elastomeric material at the contact surface with the guide rail, while the body can be a thin plate structure. The elastomeric lip provides friction compensation and maintains reliable sealing contact despite the thin overall profile, localizing the thick, compliant material only where needed for sealing performance.
Solution Approach 2:
The inside seal uses composite construction combining a thin plate body (for compactness) with an elastomeric lip or coating (for friction compensation and reliability). This composite structure allows the seal to maintain both compact dimensions and reliable performance by leveraging the complementary properties of different materials at different locations.
4Volume of moving object
If spacing interval between slider and guide rail is reduced, then device compactness is improved, but seal installation becomes difficult without additional machining
Solution Approach 1:
The inside seal is designed with flexible mounting options that adapt to varying spacing intervals. The elastomeric material and flexible mounting structures (flanges, slots) allow the seal to accommodate different gaps between slider and guide rail without requiring precise machining, making the seal installation process dynamic and adaptable rather than rigid.
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 solution effectively excludes foreign materials from load-carrying races, maintaining dustproof performance and preventing seal displacement during slider movement, thus enhancing the operational reliability of linear motion guide units in severe environments without increasing production costs.
Implementation Method 1
both the hooked portions and the flat major portion are made of the elastic member... the elastic member... making close contact with the lower surface of the carriage and lower surfaces of the end caps
Data Source
AI summary
An inside seal is installed to make close contact with a lower surface of a slider to exclude foreign material from circulating circuits, ensuring smooth sliding movement of the slider relative to a guide rail. The inside seal is composed of a major portion made of an elastic member and a metallic core, an elastic lip extending sidewise from a lengthwise side of the major portion to come into sliding contact with a guide rail, and hooked portions upright to fit into slots on end caps to keep in place the inside seal. Another longitudinal side has elastic edges to come into elastic abutment against the inside wall surface of the end cap.