Motor Friction Ring Self-Locking for Quiet Stable Braking
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Solution Overview
Problem
Existing self-locking mechanisms for motors are inconvenient to install, unstable, and noisy due to mechanical abrasions, failing to provide reliable self-locking capability and user experience.
Innovation Solution
A self-locking arrangement featuring a friction ring with a notch and limiting portions on a motor's drive shaft, allowing for enhanced friction force and deformation to achieve stable self-locking, with adjustable limiting portions for various motor types and specifications, and a design that minimizes noise and facilitates assembly and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a friction block interference-fit mounted on the output shaft is used for self-locking, then braking force is generated, but installation is inconvenient and stability is poor
Solution Approach 1:
The friction block is segmented into multiple independent friction blocks that can be independently installed and adjusted on the output shaft, converting a complex interference-fit installation into simpler, modular assembly operations
Solution Approach 2:
The friction blocks are pre-formed with specific geometric shapes and friction surfaces before installation, allowing for precise positioning and stable mounting on the output shaft without requiring complex interference-fit procedures during assembly
2Force
If a friction block driven by the output shaft and a further friction part are used for self-locking, then braking force is generated, but the mechanism is likely noisy due to mechanical abrasions
Solution Approach 1:
The patent converts the harmful mechanical abrasions between friction blocks into beneficial self-lubricating surfaces through controlled wear patterns, where the friction surfaces develop smooth, lubricated zones that reduce noise while maintaining braking effectiveness
Solution Approach 2:
The friction blocks are designed with specific material compositions and surface properties that optimize the friction coefficient and wear characteristics, changing the physical parameters of the friction surfaces to reduce mechanical abrasion noise while maintaining adequate braking force
3Reliability
If multiple friction blocks are used for self-locking, then braking stability is improved, but device complexity increases
Solution Approach 1:
Each friction block is designed as a universal component that can be positioned at multiple locations around the output shaft and serves both as a braking surface and a positioning element, eliminating the need for separate mounting mechanisms and reducing overall device complexity
Solution Approach 2:
The friction blocks are designed with symmetric geometric features and uniform friction properties that create equipotential conditions for force distribution, ensuring stable braking performance while maintaining simple, identical structures that reduce design and manufacturing complexity
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 stable and quiet self-locking mechanism that adapts to different motor types, enhances motor control precision, and reduces power loss, ensuring reliable operation and easy maintenance.
Implementation Method 1
a friction force between the drive shaft and the friction ring can drive the friction ring to rotate towards the first direction... producing a larger friction force against the drive shaft, realizing braking to the drive shaft
Implementation Method 2
the connecting element is a spring... the connecting element and the friction ring are one-piece formed
Data Source
AI summary
A self-locking arrangement for a motor and a linear actuator which relates to motors. The motor has a self-locking capability, a good stability, a low noisy during operation, and a good user experience. The self-locking arrangement includes an end cap mounted on the motor and a friction ring sleeved over a drive shaft of the motor, a notch being provided on the friction ring, a limiting portion being provided at an outer periphery of the friction ring, the end cap being fitted with the limiting portion, so that the friction ring clasps the drive shaft in a case where the drive shaft rotates along a first direction.