Linear Guide Seal with Cushioning and Nested Locking
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Solution Overview
Problem
Conventional linear guide devices face issues with dust resistance and wear resistance due to manufacturing errors leading to gaps between seal members and guide rails, and poor workability in attaching side seals, as well as vulnerability to seal member detachment under vibration.
Innovation Solution
A linear guide device with a side seal comprising a retainer plate, cover member, and seal member, where the seal base contacts alignment sections of the retainer plate, and locking sections are accommodated in concave sections to prevent deformation and detachment, ensuring integrated and detachable components for improved attachment and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal base is engaged with the case section without backlash, then the seal member is securely held, but manufacturing errors generate gaps between the lip and guide rail surface, deteriorating dust resistance or causing excessive contact force
Solution Approach 1:
The patent introduces a cushioning section in the seal base that absorbs manufacturing errors and assembly variations before they affect the lip-guide rail interface. This cushioning structure prevents gaps from forming while maintaining reliable engagement without requiring perfect manufacturing precision.
Solution Approach 2:
The patent modifies the geometric parameters of the seal base, specifically adding a cushioning section with controlled dimensions that can deform or compress to compensate for manufacturing tolerances. This parameter change allows the seal to adapt to variations while maintaining optimal contact between the lip and guide rail surface.
2Ease of manufacture
If the seal member, case section, and scraper section are separated components, then each part can be manufactured independently, but workability for attaching the side seal deteriorates due to multiple screw fastenings required
Solution Approach 1:
The patent combines the seal member, case section, and scraper section into an integrated side seal assembly where these components are pre-assembled or formed as a single unit. This merging eliminates the need for multiple screw fastenings during installation while maintaining the ability to manufacture components independently using modular design principles.
Solution Approach 2:
The integrated side seal structure serves multiple functions simultaneously: sealing, scraping, and structural support, all within a single assembly unit. This multi-functionality improves installation efficiency while maintaining manufacturing flexibility through standardized component interfaces.
3Device complexity
If only the seal outer circumference is attached to the concave groove in the end cap, then the structure is simple, but under big vibration the seal base may slide out and the seal member may fall off
Solution Approach 1:
The patent employs a nested engagement structure where the side seal assembly is inserted into and locked within the end cap's concave groove. The seal base features engagement protrusions that fit into corresponding recesses in the end cap, creating a nested configuration that prevents vibration-induced detachment while maintaining structural simplicity.
Solution Approach 2:
The patent adds engagement features in the cross-sectional direction (orthogonal to the thickness direction) to prevent lateral sliding of the seal base under vibration. This dimensional addition to the attachment structure provides multi-directional constraint without significantly increasing overall complexity.
Data Source
AI summary
A seal member is a member including a lip, a seal base, a first extension section smaller in thickness than the seal base, and a first locking section, all of which are formed to be continuous in the cross-sectional direction. A retainer plate includes a base accommodating concave section for accommodating the seal base, and a first engagement concave section for accommodating the first locking section, and controls the first locking section to prevent the seal member from falling off. The first locking section is accommodated in the first engagement concave section with gaps left in the thickness and cross-sectional directions.