Threaded Mechanical Brake for Bidirectional Rotation Locking
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Solution Overview
Problem
Existing mechanical brake systems for winches and hoists lack efficient bidirectional operation and fail to prevent unintended rotation when decoupled from power sources, posing safety risks.
Innovation Solution
A mechanical brake system comprising a central shaft, input and output brake plates, and stator plates that allow bidirectional torque transmission and automatically engage to prevent rotation when power is removed, using threaded drivers and friction discs to manage torque and frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical brake system is designed to allow bidirectional operation, then operational versatility is improved, but the risk of unintended rotation when decoupled from power sources increases
Solution Approach 1:
The brake system is segmented into multiple independent friction discs (first friction disc, second friction disc) and stator plates that can engage separately. This segmentation allows the system to provide bidirectional braking control while maintaining safety through independent engagement mechanisms for each direction of rotation.
Solution Approach 2:
The brake system incorporates self-actuating mechanisms where the friction discs and stator plates automatically engage to prevent unintended rotation when the power source is decoupled. The system uses its own structural components (threaded drivers, friction surfaces) to automatically apply braking force without requiring external intervention, thus improving reliability while maintaining versatility.
2Reliability
If stator plates are compressed between brake plates to prevent rotation, then safety is improved, but the complexity of the device increases
Solution Approach 1:
The patent merges multiple functions into the brake plates and stator plates. The brake plates serve both as structural support elements and as compression surfaces that apply braking force. The stator plates are integrated into the same assembly, eliminating the need for separate braking mechanisms and reducing overall device complexity while maintaining effective rotation prevention.
Solution Approach 2:
The brake plates and stator plates are designed with multi-functionality, serving both structural and braking functions simultaneously. These components can engage to prevent rotation in both directions of operation, providing universal safety coverage without requiring direction-specific braking mechanisms, thus reducing complexity.
3Manufacturing precision
If threaded drivers and friction discs are used to manage torque, then torque control precision is improved, but manufacturing complexity increases
Solution Approach 1:
The system uses threaded drivers with specific thread parameters (pitch, diameter, handedness) to precisely control torque transmission and braking force. By carefully selecting and standardizing these thread parameters, the system achieves high torque control precision while using conventional manufacturing processes that are not overly complex.
Solution Approach 2:
The friction discs are designed with specific local properties (friction coefficient, surface area, material composition) at the contact surfaces to optimize torque control. This localized quality enhancement focuses manufacturing precision only where needed (at the friction interfaces) rather than requiring high precision throughout the entire component, thereby reducing overall 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
Enables safe and efficient bidirectional operation of winches and hoists by ensuring controlled torque transmission and automatic engagement to prevent unintended rotation, enhancing safety and operational reliability.
Implementation Method 1
compression of the stator plate between the input brake plate and the output brake plate prevents rotation of the output brake plate
Implementation Method 2
a first friction disc located between the input brake plate and the first stator plate; a second friction disc located between the first stator plate and the second stator plate; and a third friction disc located between the second stator plate and the output brake plate
Data Source
AI summary
A brake or a clutch includes a central shaft, an output-side threaded driver, an output brake plate, an input brake plate, and an input-side threaded driver. The output-side threaded driver and the input-side threaded driver are rotationally locked to the central shaft, such as by splines. The output-side threaded driver is threaded to the output brake plate and the input-side threaded driver is threaded to the input brake plate. The output brake plate is threaded to the input brake plate in a direction opposite the threaded engagement of the drivers to the brake plates. The brake or clutch may include two stator plates and three friction discs located between the output brake plate and the input brake plate.