Track Rail Design for Motion Guidance Rigidity
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Solution Overview
Problem
Conventional motion guidance apparatuses face challenges in achieving both rigidity and precision due to the diamond cross-sectional shape of track rails, which deforms under load, and rectangular shapes that result in reduced loaded contact surfaces when the contact angle is set obliquely, leading to instability and reduced precision.
Innovation Solution
A track rail design with rolling member rolling grooves on the upper and side surfaces, featuring an inclination angle between 10 and 20 degrees, ensuring that the grooves on the side surfaces are positioned outside imaginary lines drawn from the upper surface grooves, and portions near the grooves are formed with this angle to maintain rigidity and prevent ball displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the track rail has a diamond cross-sectional shape with corners protruding sideways, then the contact angle between balls and rolling member rolling grooves can be set along an oblique direction for load distribution in four directions, but the rigidity of the track rail decreases and the rail deforms under load
Solution Approach 1:
The invention introduces an asymmetric inclination angle (10-20 degrees) on the upper surface and side surfaces where the rolling grooves are formed. This asymmetric design allows the track rail to maintain a rectangular cross-section for rigidity while creating oblique contact surfaces for proper ball engagement, resolving the contradiction between load distribution capability and structural rigidity.
Solution Approach 2:
The inclination angle is applied locally only to the portions of the upper and side surfaces where the rolling grooves are formed, rather than changing the entire cross-sectional shape. This localized modification maintains the overall rectangular shape and rigidity of the track rail while providing the necessary oblique contact surfaces for ball engagement in specific regions.
2Strength
If the track rail has a rectangular cross-sectional shape, then the rigidity is improved, but the loaded contact surface area is reduced when the contact angle is set obliquely, causing balls to shift and run on the ends of the grooves
Solution Approach 1:
The inclination angle is applied locally only to the portions of the upper and side surfaces where the rolling grooves are formed, rather than changing the entire cross-sectional shape. This localized modification maintains the overall rectangular shape and rigidity of the track rail while providing the necessary oblique contact surfaces for ball engagement in specific regions.
Solution Approach 2:
The invention changes the angular parameter of the surfaces by introducing a specific inclination angle range (10-20 degrees) on the upper and side surfaces. This parameter modification optimizes the contact geometry between balls and grooves, ensuring adequate loaded contact surface area while maintaining the rectangular cross-section for rigidity.
3Adaptability or versatility
If rolling member rolling grooves are formed on upper and side surfaces with oblique contact angle, then load distribution in multiple directions is achieved, but the precision decreases due to ball displacement on groove ends
Solution Approach 1:
The invention changes the angular parameter of the surfaces by introducing a specific inclination angle range (10-20 degrees) on the upper and side surfaces. This parameter modification optimizes the contact geometry between balls and grooves, ensuring adequate loaded contact surface area while maintaining the rectangular cross-section for rigidity.
Solution Approach 2:
The invention introduces an asymmetric inclination angle (10-20 degrees) on the upper surface and side surfaces where the rolling grooves are formed. This asymmetric design allows the track rail to maintain a rectangular cross-section for rigidity while creating oblique contact surfaces for proper ball engagement, resolving the contradiction between load distribution capability and structural rigidity.
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 design enhances the rigidity and precision of motion guidance apparatuses by maintaining a stable loaded contact surface and accommodating balls effectively, allowing the apparatus to function in any orientation with equal load distribution in four directions.
Implementation Method 1
a movable block assembled to the track rail via a plurality of rolling members so that the movable block can make reciprocating motion relative to the track rail
Data Source
AI summary
Rigidity and precision of a motion guidance apparatus are increased by improving track rail shape. A track rail has at least two rolling member rolling grooves (RMRGs) on the upper surface and at least one RMRG on each side surface, the RMRGs extending in the longitudinal direction. When the RMRGs are taken along a cross-sectional plane perpendicular to the longitudinal direction of the track rail, and two imaginary lines extending vertically downward are drawn from ends of the respective grooves located on the outer sides among upper surface RMRGs, all the side surface RMRG are positioned in the rail but outside the corresponding one of the two imaginary lines, and at least portions of the upper surface and the side surfaces of the track rail, on which the RMRGs are formed, the portions being in the vicinity of the respective RMRGs, are formed with an inclination angle.