Sliding Scraper Attachment Structure for Linear Guide Devices
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Solution Overview
Problem
The conventional sliding scraper, molded from elastomers like rubber, tends to deform and create gaps with the guide rail due to molding shrinkage, allowing foreign substances like dust to enter the linear guide device.
Innovation Solution
An attachment structure with a square U-shape attachment plate and a sliding scraper featuring protrusion portions that abut with the attachment plate's vertical frames, ensuring close contact with the guide rail and preventing gap formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sliding scraper is formed by vulcanization molding of elastomer, then the sliding scraper can be manufactured with good elasticity and sealing performance, but the sliding scraper tends to contract and deform after demolding, creating gaps with the guide rail
Solution Approach 1:
The attachment plate applies preliminary counteracting force to the molding shrinkage of the sliding scraper. The elastic material of the sliding scraper is compressed between the attachment plate and the guide rail, creating a pre-compressed state that compensates for the contraction tendency after demolding, thereby preventing gap formation.
Solution Approach 2:
The patent changes the physical state parameters of the sliding scraper by applying continuous compressive force through the attachment plate structure. This maintains the elastic material in a compressed state, counteracting the natural relaxation and contraction that occurs after vulcanization molding.
2Device complexity
If the sliding scraper is fitted in the attachment plate without protrusion portions, then the structure is simple, but gaps form between the sliding scraper and guide rail due to molding shrinkage, allowing foreign substances to enter
Solution Approach 1:
The attachment plate is segmented with protrusion portions that independently contact the sliding scraper at multiple locations. This segmentation allows localized compression forces to be applied at specific points, ensuring uniform pressure distribution and effective gap prevention without requiring complex overall restructuring.
Solution Approach 2:
The protrusion portions of the attachment plate serve as intermediary elements between the attachment plate body and the sliding scraper. These protrusions transmit the compressive force from the attachment plate to the sliding scraper, mediating the force transmission to achieve reliable sealing while maintaining structural simplicity.
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 substances from entering the linear guide device by maintaining close contact between the sliding scraper and the guide rail, reducing sliding resistance and enhancing durability.
Implementation Method 1
The sliding scraper is formed of an elastic material such as rubber and after demolding, the vulcanization-molded sliding scraper tends to contract in the direction indicated by arrow X
Implementation Method 2
The sliding scraper is in abutment with an upper surface and opposite side portions of the guide rail and thus sealed so as to prevent foreign substances from entering the inside of the slider from a gap between the slider and the guide rail
Data Source
AI summary
A slider slidably straddling over a guide rail, an attachment plate having a square U-shape attached to an end surface of the slider and including opposite vertical frames and a horizontal frame connecting the vertical frames, and a sliding scraper fitted in a square U-shape groove of the attachment plate and including opposite vertical portions and a horizontal portion connecting the opposite vertical portions, and a groove portion that is in sliding contact with the guide rail are provided, and protrusion portions at which the vertical frames and the vertical portions are in abutment with each other are provided an open end portion of an inner side surface of each of the opposite vertical frames of the attachment plate or an end portion of an outer side surface of each of the opposite vertical portions of the sliding scraper, the end portion facing the relevant open end portion.