Linear Guide Ball Recirculation with Spiral Threads for Load Distribution
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Solution Overview
Problem
Conventional linear guide apparatuses suffer from reduced operational life due to concentrated ball loading and noise issues caused by differential ball speeds, which arise from the inability of balls to laterally flip and align properly during recirculation.
Innovation Solution
The design incorporates a guide rail, carriage block, recirculating tubes with odd spiral threads, and U-shaped end covers, allowing rolling balls to laterally roll at a specific angle and preventing re-alignment to a single point, thus distributing load and maintaining consistent speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional recirculating channels are used with diameter larger than ball diameter, then ball recirculation is enabled, but ball dislocation occurs causing different speeds and disturbing noise
Solution Approach 1:
The recirculating channel is designed with a specific curvature radius that is not larger than the diameter of the rolling ball, creating a curved path that forces balls to maintain consistent speed and prevents dislocation. This curved geometry ensures all balls follow the same rotational path, eliminating speed variations and the resulting noise.
2Reliability
If conventional sliding grooves are used, then linear motion guidance is achieved, but ball load concentrates at one point reducing operation life
Solution Approach 1:
The invention introduces a lateral flipping mechanism that adds a rotational dimension to ball motion. Balls not only move linearly through the sliding groove but also flip laterally to change their contact points, distributing the load across different areas of the ball surface rather than concentrating it at a single point, thereby extending operation life.
Solution Approach 2:
The system incorporates a dynamic ball flipping mechanism that actively changes ball orientation during operation. The lateral flip capability allows balls to dynamically adjust their contact points with the sliding groove, preventing static load concentration and reducing wear at any single location.
3Ease of operation
If recirculating channels with large diameter are used, then ball recirculation is enabled, but ball dislocation causes different speeds
Solution Approach 1:
The recirculating channel employs a carefully controlled curvature radius that matches the ball diameter, creating an optimal curved path. This geometric constraint ensures balls recirculate smoothly while maintaining uniform speed, preventing the dislocation that would occur in larger diameter channels.
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
This design extends the operational life of the linear guide apparatus by preventing ball deformation and reduces noise by ensuring balls move concentrically at the same speed.
Implementation Method 1
Each of the recirculating tubes comprises a plurality of spiral threads formed on an inner surface thereof, and the number of the spiral threads is odd which enables the rolling balls to have lateral roll at a specific angle when passing therethrough
Implementation Method 2
since the friction type of the linear guide apparatus is the rolling friction, the friction coefficient can be reduced to about one-fifth of the original sliding guidance
Data Source
AI summary
A linear guide apparatus may include a guide rail, a carriage block, at least two recirculating tubes, and two end covers. The carriage block has an axial sliding channel formed at a middle portion of a bottom surface thereof, and the carriage block is slidably coupled on the guide rail through the sliding channel. Each of two sides of the sliding channel has at least a sliding groove formed between the carriage block and guide rail. Each sliding groove comprises a plurality of rolling balls installed therein so as to enable the carriage block to slide forward and backward on the guide rail. Each of the sliding grooves is cooperated with a recirculating channel axially penetrating through the carriage block. Each of the recirculating tubes comprises a plurality of spiral threads to enable the rolling balls to have lateral roll at a specific angle when passing therethrough.