Linear Bearing Clutch With Passive One-Way Locking
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Solution Overview
Problem
Existing linear bearing designs are either bidirectional, require motorized actuators for motion restriction, or suffer from backlash and limited thrust-loading capacity.
Innovation Solution
A purely mechanical, passive linear bearing clutch that locks in one direction without backlash, operates continuously on a smooth surface, and handles high thrust loads, using a tapered surface and contact elements with a coefficient of static friction greater than the tangent of the taper angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional linear bearings are used, then bidirectional motion is permitted, but motion restriction in one direction cannot be achieved
Solution Approach 1:
The bearing incorporates asymmetric surface geometry with a tapered surface having a specific angle range (15-45 degrees). This asymmetric design allows the bearing to permit motion in one direction while restricting motion in the opposite direction, eliminating the need for complex additional components and achieving unidirectional motion control through geometric asymmetry alone
2Ease of operation
If shaft collars are used to restrict motion, then motion control is achieved, but the collar becomes completely stationary and cannot accommodate linear motion
Solution Approach 1:
The bearing design enables dynamic functionality where the bearing can freely move along the shaft in one direction while simultaneously restricting motion in the opposite direction. This is achieved through the interaction between the tapered surface and the contact elements, allowing the bearing to adapt its motion characteristics based on the direction of applied forces
3Ease of operation
If motorized actuators are used to restrict motion, then active motion control is achieved, but the system requires electronics and increases complexity
Solution Approach 1:
The bearing utilizes self-service through its inherent asymmetric geometry and friction characteristics. The tapered surface combined with contact elements creates a self-locking mechanism that automatically restricts motion in one direction without requiring external actuators, sensors, or electronic control systems, thereby simplifying the overall system
4Ease of operation
If ratcheting mechanisms are used, then unidirectional locking is achieved, but backlash and discrete axial positioning occur
Solution Approach 1:
The bearing employs curved contact surfaces including a tapered surface and rounded contact elements. This curvature design eliminates backlash by ensuring continuous contact between surfaces, allowing for smooth motion restriction without the discrete steps or gaps characteristic of toothed ratcheting mechanisms, thereby improving positioning precision
5Device complexity
If conventional linear bearing designs are used, then simplicity is maintained, but thrust-loading capacity is limited
Solution Approach 1:
The bearing design incorporates a tapered surface geometry that converts axial thrust loads into radial contact forces. By utilizing the third dimension through the taper angle, the bearing achieves enhanced thrust-loading capacity while maintaining a simple overall structure, as the geometric transformation of force vectors provides additional load-bearing capability
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 solution provides a reliable, compact, and efficient linear bearing clutch that eliminates the need for auxiliary electronics, reduces size and weight, and is compatible with various form factors and applications.
Implementation Method 1
a coefficient of static friction between the one or more contact elements, the tapered surface, and the second surface can be greater than a tangent of the taper angle
Data Source
AI summary
A linear bearing clutch includes a first surface, a second surface, one or more contact elements, and a holding device. The first surface includes a tapered surface. The second surface includes a flat or curved surface. The holding device is configured to hold the one or more contact elements. The first surface is configured to permit motion of the one or more contact elements along a first direction of the second surface and restrict motion of the one or more contact elements in a second direction of the second surface, the second direction being opposite the first direction.