Rail Mounting Hole Closing Cap Alignment
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Solution Overview
Problem
The existing closing caps for rail mounting holes in linear guide devices are prone to being press-fitted inclined, leading to gaps and allowing foreign substances to enter the slider, requiring high force for press-fitting and causing early wear and accuracy issues.
Innovation Solution
A closing cap structure with a leading end portion and a positioning protrusion that allows provisional positioning within the rail mounting hole, preventing inclined press-fitting by using a tip edge portion with an outer diameter matching or slightly larger than the hole's inner diameter, enabling manual alignment and smooth press-fitting without large external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closing cap is press-fitted into the rail mounting hole to prevent foreign substance entry, then sealing performance is improved, but the closing cap becomes inclined during press-fitting causing gaps and reduced sealing effectiveness
Solution Approach 1:
The closing cap is designed with a leading end portion that is inserted into the rail mounting hole before the main body is press-fitted. This preliminary insertion action positions the closing cap coaxially with the hole, preventing inclination during subsequent press-fitting and ensuring accurate fitting without gaps.
2Strength
If high force is applied to press-fit the closing cap securely, then fitting strength is improved, but the closing cap becomes inclined and gaps form between the cap and rail mounting hole
Solution Approach 1:
The leading end portion is inserted into the rail mounting hole before applying press-fitting force. This preliminary positioning ensures the closing cap is coaxially aligned, allowing secure fitting with appropriate force without causing inclination or gaps.
Solution Approach 2:
The closing cap is divided into a leading end portion and a main body portion. The leading end portion serves as a positioning element that guides insertion and alignment, while the main body portion receives the press-fitting force. This segmentation allows force application without compromising alignment.
3Strength
If the outer diameter of the closing cap is made larger than the rail mounting hole inner diameter for secure fitting, then fitting strength is improved, but the closing cap cannot be inserted without inclination
Solution Approach 1:
The closing cap is segmented into a leading end portion with a smaller outer diameter and a main body portion with a larger outer diameter. The leading end portion's smaller diameter allows easy insertion and coaxial alignment, while the main body portion's larger diameter provides secure press-fitting strength.
Solution Approach 2:
The leading end portion is nested within the main body portion, forming a tapered or stepped structure. This nested configuration allows the smaller leading end to guide insertion into the hole first, followed by the larger main body being press-fitted securely, combining ease of insertion with strong fixation.
Data Source
AI summary
A structure for closing a track rail mounting hole is disclosed, which prevents a closing cap from being press-fitted with an inclined state into the rail mounting hole, thereby being capable of positively preventing formation of a gap between the rail mounting hole and the closing cap. The closing cap includes a fitting portion having an outer diameter larger than an inner diameter of the rail mounting hole, to be press-fitted into the rail mounting hole; and a leading end portion to be inserted into the rail mounting hole before press-fitting the fitting portion into the rail mounting hole, for provisionally positioning the closing cap with respect to the rail mounting hole.