Friction Ring Self-Locking Mechanism for Wear-Stable Braking
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Solution Overview
Problem
Conventional self-locking mechanisms in electric lifting columns and torsional springs experience deterioration in self-locking performance due to increased stress and wear, leading to reduced friction force and stability over time.
Innovation Solution
A self-locking mechanism featuring a friction ring with a notch and a mounting seat that applies a braking force, combined with a limiting structure using snap-fit grooves and raised edges to prevent rotation and maintain static engagement, allowing for easy assembly and replacement of worn parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead angle of worm-worm gear drive is made smaller than friction angle to achieve self-locking, then self-locking capability is improved, but the friction force decreases over time due to stress and wear, leading to deterioration of self-locking performance
Solution Approach 1:
The friction component is segmented into a replaceable friction ring and a mounting seat. The friction ring can be independently replaced when worn, allowing the mounting seat and other components to continue serving. This segmentation enables maintenance without replacing the entire self-locking mechanism, thus extending the operational duration while maintaining reliable self-locking capability throughout the service life.
2Reliability
If friction materials like POM100P are used in torsion spring seat to achieve self-locking, then self-locking performance is improved, but the friction coefficient decreases after serving a period of time, leading to deterioration of self-locking performance
Solution Approach 1:
The friction ring is designed as a disposable or easily replaceable component made of friction material. When the friction ring wears out and the friction coefficient decreases, the entire friction ring can be replaced rather than the entire mounting seat or torsion spring assembly. This approach maintains reliable self-locking performance throughout the service life by allowing periodic replacement of the consumable friction component.
3Force
If friction ring is pressed tightly against rotary body to achieve strong braking force, then stopping capability is improved, but wear and noise occur during assembly and operation
Solution Approach 1:
A limiting structure is provided that pre-establishes the correct positioning and spacing between the friction ring and rotary body during assembly. The limiting structure ensures that the friction ring is initially positioned correctly without requiring excessive pressing force, thereby preventing wear and noise during the assembly process while still allowing sufficient braking force to be generated during operation.
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 mechanism achieves stable and dynamic self-locking performance, preventing wear and noise during assembly, and allows for easy maintenance by replacing the friction ring, ensuring consistent braking force and improved durability.
Implementation Method 1
a friction ring (100) and a mounting seat (200) fixed relative to the friction ring... the mounting seat pressing the friction ring towards the notch to apply a braking force against the rotary body
Implementation Method 2
a clearance is reserved between two ends of the friction ring, i.e., the notch defined by the two ends of the friction ring allows for the inside diameter of the friction ring to vary under an external acting force
Data Source
AI summary
A self-locking mechanism, a motor, and a linear actuator, which relate to the field of self-locking mechanisms and have a stable self-locking performance. The self-locking mechanism includes a friction ring and a mounting seat fixed relative to the friction ring, a notch being provided on the friction ring, the friction ring being sleeved over a rotary body to be braked, a mounting portion for mounting the friction ring being defined on the mounting seat, the mounting seat pressing the friction ring towards the notch to apply a braking force against the rotary body.