Motion Guide Device Belt Interference Reduction
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Solution Overview
Problem
The existing motion guide devices experience interference between the belt members and guide grooves in the direction-changing paths, leading to excessive sliding resistance and potential mechanical issues during the circulation of rolling elements.
Innovation Solution
The guide grooves in the direction-changing paths are designed with a maximum width at the midpoint and decreasing widths towards the ends, featuring a smoothly continuous outer and inner circumferential guide surfaces to prevent interference with the belt members, ensuring smooth circulation of rolling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the guide groove width is uniform throughout the direction-changing path, then the manufacturing is simpler, but the belt member interferes with the guide groove causing excessive sliding resistance
Solution Approach 1:
The guide groove width is varied locally along its length, being wider at the midpoint of the direction-changing path and narrower at the ends. This local variation in geometry allows the belt member to pass through the curved path without interference while maintaining manufacturing feasibility.
Solution Approach 2:
The width parameter of the guide groove is changed along its length to optimize the circulation of the belt member. By increasing the groove width at the midpoint where the belt member experiences maximum curvature, the design reduces sliding resistance without requiring complete redesign of the entire groove structure.
2Ease of operation
If the guide groove width is increased at the midpoint to prevent interference, then the belt member circulates smoothly, but the manufacturing complexity increases
Solution Approach 1:
Rather than making the entire guide groove complex, only the midpoint section is widened while the end sections remain narrower. This localized geometric modification achieves smooth belt member circulation without requiring complex overall groove design.
Solution Approach 2:
The guide groove incorporates curved surfaces with specific radius of curvature at the midpoint to match the belt member's circulation path. This curvature design allows the belt member to follow the groove smoothly through the direction-changing path, reducing interference and improving circulation.
Data Source
AI summary
A motion guide device for preventing interference of belt members with guide grooves. The motion guide device includes an endless circulation path for rolling elements, and a coupling member received in the endless circulation path. The endless circulation path includes a load rolling element path, a rolling element return path, and a direction-changing path. The direction-changing path includes a guide groove for the coupling member, which has an outer circumferential guide surface and an inner circumferential guide surface. The guide groove has a maximum width at a midpoint of a path within a range of from a coupling end between the direction-changing path and the load rolling element path or the rolling element return path to a center portion of the direction-changing path, and the groove width at the coupling end and the groove width at the center portion are smaller than the maximum value of the groove width.