Reverse-Braking Transmission for High-Torque Robotic Joints
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Solution Overview
Problem
Conventional braking methods for electromechanical equipment, such as cranes and robots, suffer from complex structures, large volumes, high cost, small braking torques, and low reliability, necessitating a more efficient and reliable braking mechanism.
Innovation Solution
A transmission device with a reverse braking function, featuring a driven shaft, a brake block, an elastic member, and a drive member, where the brake block moves between a braking and release position to prevent rotation when the drive member stops, utilizing a simple structure with a small number of parts and low friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electromagnetic brakes or worm gear pairs are used for braking, then braking function is achieved, but the structure becomes complex with large volume and high cost
Solution Approach 1:
The brake block is integrated with the driven shaft as a unified structure, eliminating the need for separate braking components. The brake block directly abuts against the housing seat to provide braking force, merging the braking function into the existing driven shaft assembly and thereby simplifying the overall structure while maintaining braking reliability
Solution Approach 2:
The elastic member automatically pushes the brake block against the housing seat when the drive member stops rotating, providing self-actuating braking without requiring external control mechanisms. This self-service braking mechanism eliminates complex control systems while ensuring reliable braking action
2Force
If conventional electromagnetic brakes are mounted on motor shaft to prevent rotation, then braking force is provided, but the volume and cost increase
Solution Approach 1:
The brake block is formed as an integrated part of the driven shaft, combining the shaft and brake components into a single structure. This integration eliminates the need for separate brake assemblies mounted on motor shafts, thereby providing sufficient braking torque while significantly reducing the overall volume of the braking system
Solution Approach 2:
The braking function is extracted from the motor shaft assembly and relocated to the driven shaft, where it operates independently. This extraction allows the braking mechanism to be sized according to actual braking requirements rather than motor shaft constraints, optimizing both torque capability and volume efficiency
3Reliability
If conventional braking mechanisms are used, then braking is achieved, but friction consumption is high
Solution Approach 1:
The brake block is designed with a localized friction surface that directly contacts the housing seat only when braking is required. This localized contact area minimizes unnecessary friction during non-braking operation while ensuring sufficient friction force during braking, thereby reducing overall energy loss while maintaining braking reliability
Solution Approach 2:
The brake block dynamically adjusts its position relative to the housing seat, being pushed against it only when the drive member stops rotating. This dynamic engagement reduces continuous friction consumption during operation while providing reliable braking force when needed, optimizing the balance between energy efficiency and braking performance
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 device achieves automatic reverse braking with large braking torque, low friction consumption, low cost, and high reliability, ensuring the driven shaft cannot transmit torque in reverse.
Implementation Method 1
an elastic member coupled to the driven shaft and the brake block and configured to press the brake block towards the braking position
Implementation Method 2
the brake block abuts against the housing seat... when the drive member stops rotating, the elastic member pushes the brake block to the braking position to prevent the driven shaft and the brake block from rotating together
Data Source
AI summary
In some aspects, a transmission device with a reverse braking function includes a housing seat having a seat hole; a driven shaft rotatably and at least partially supported in the seat hole; a brake block arranged on the driven shaft and rotatable together with the driven shaft, the brake block being movable relative to the driven shaft between a braking position where the brake block abuts against the housing seat and a release position where the brake block is separated from the housing seat; an elastic member coupled to the driven shaft and the brake block and configured to press the brake block towards the braking position; and a drive member coupled to the driven shaft.