Gothic Arch Scoop Section for High-Speed Motion Guide Durability
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Solution Overview
Problem
The scoop section of motion guide devices is prone to damage during high-speed movement due to deformation and collision of balls, making it difficult for balls to enter load ball rolling paths and causing plastic deformation.
Innovation Solution
A motion guide device with a scoop section formed into a Gothic arch groove for two-point contact, featuring a contact angle between 30° and 60°, and an arc surface at the contact starting position to mitigate damage by increasing scoop section thickness and strength, and allowing smooth transition from Gothic arch to circular arc grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the moving block is moved at high speed, then productivity is improved, but the scoop section is likely to be damaged due to ball deformation and collision
Solution Approach 1:
The invention changes the geometric parameters of the scoop section by forming it into a Gothic arch groove shape with a specific contact angle (30° to 60°). This parameter change allows the scoop section to effectively guide balls at high speeds without deformation or collision damage, resolving the contradiction between high-speed operation and scoop section durability
Solution Approach 2:
The invention applies curvature by forming the scoop section into a Gothic arch groove shape with rounded surfaces. The curved geometry enables smooth ball transition and contact, preventing the ball deformation and collision that occur with sharp or flat edges, thereby maintaining reliability at high speeds
2Ease of operation
If the contact angle is increased to improve ball entry, then manufacturing complexity increases due to precise angle requirements
Solution Approach 1:
The invention specifies a contact angle range of 30° to 60° for the Gothic arch groove, optimizing ball entry smoothness while providing a practical manufacturing range. This parameter specification balances operational ease with manufacturability by defining clear geometric constraints
Solution Approach 2:
The Gothic arch groove shape with its characteristic curved geometry provides inherent guidance for ball entry. The curvature of the groove walls naturally guides balls into the correct position and orientation, reducing the need for additional complex features while ensuring smooth operation
Data Source
AI summary
A motion guide device having a novel scoop section structure whose scoop section is not likely to break even if a movement member is moved at high speed. A scoop section (22) of a movement block (12) scoops balls (13) that roll in a ball rolling groove (11a) of a raceway rail (11) and introduces them into no-load ball return paths (17, 20). The scoop section (22) is formed in a Gothic arch groove shape in which the scoop section (22) is in two-point contact with a ball (13). In a cross-section orthogonal to the advance direction of the balls (13), an angle (contact angle α) formed by a line L1 that connects a point P at which the scoop section (22) and a ball (13) are in contact and the center C of the ball (13) and a line L2 that connects the center of the ball (13) and a bottom (22a) of the Gothic arch groove-shaped scoop section (22) exceeds 30 degrees and is not more than an angle γ formed by a line L3 that connects the center C of the ball (13) rolling in the ball rolling groove (11a) of the raceway rail (11) and an edge (35) of the ball rolling groove (11a) of the raceway rail (11) and the line L2 that connects the center C of the ball (13) and the bottom of the ball rolling groove (11a).