Dual Actuator Mechanical Brake with Segmented Locking
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Solution Overview
Problem
Existing mechanical braking systems face challenges in achieving fail-safety through redundancy and wear adjustment, particularly in electric motor-driven systems, where the brake gap increases due to wear, and there is a need for efficient contact pressure generation and adjustment.
Innovation Solution
A mechanical braking device with a first non-self-locking actuator and a second self-locking actuator, where the second actuator can only be adjusted by a differential force or torque, allowing for independent operation of both actuators to ensure braking functionality even if one fails, and incorporating non-linear actuation for rapid braking and wear compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single actuator is used for brake actuation, then the device complexity is reduced, but the reliability decreases due to lack of redundancy
Solution Approach 1:
The braking system is segmented into two independent actuators (first actuator with non-self-locking output and second actuator with self-locking output), each capable of independently actuating the brake. This segmentation provides redundancy while maintaining manageable complexity through modular design.
Solution Approach 2:
Different self-locking characteristics are assigned to different actuators based on their specific functions. The first actuator has non-self-locking output for rapid response service braking, while the second actuator has self-locking output for reliable parking brake holding, optimizing each component's properties for its specific role.
2Reliability
If a self-locking actuator is used for parking brake, then the reliability of brake holding is improved, but the ease of operation deteriorates due to requiring differential force for adjustment
Solution Approach 1:
The self-locking second actuator automatically maintains brake holding without requiring continuous operation or adjustment. The differential force requirement is only temporary during adjustment phases, after which the self-locking mechanism maintains the position autonomously.
Solution Approach 2:
The actuator transitions between two states: during adjustment, differential force enables movement; during holding, the self-locking mechanism maintains position without force input. This dynamic behavior optimizes both reliability during holding and operational flexibility during adjustment.
3Ease of operation
If a non-self-locking actuator is used for service brake, then the ease of operation is improved for rapid response, but the reliability deteriorates due to inability to maintain position
Solution Approach 1:
The braking function is segmented between two actuators with different characteristics. The non-self-locking first actuator handles service braking where rapid response is critical, while the self-locking second actuator handles parking brake where position maintenance is critical, allowing each to optimize for its specific function.
Solution Approach 2:
The system merges two actuators with complementary characteristics into a unified braking system. The non-self-locking first actuator provides rapid response capability, while the self-locking second actuator provides position maintenance capability, combining their advantages to achieve both fast response and reliable holding.
4Reliability
If two independent actuators are used for redundancy, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Both actuators follow the same basic design pattern with input and output sides, allowing for standardized components and simplified control logic. The consistency in design reduces complexity despite having two actuators, as they can be managed through uniform procedures and interfaces.
Data Source
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AI summary
The invention relates to a mechanical braking device (10) that can be connected to a brake part (13). Furthermore, the braking device (10) comprises at least one first actuating drive (11) that is non-self-inhibiting in at least one region and has a drive side (23) and an output side (24), and at least one second actuating drive (12) that is self-inhibiting in at least one region and has a drive side (25) and an output side (26). The aim of the invention is to provide increased reliability and more cost-effective production. To this end, the at least one first actuating drive (11) and the at least one second actuating drive (12) are interconnected such that a movement of the brake part (13) over the first drive side (23) of the first actuating drive (11) and also over the second drive side (25) of the second actuating drive (12) can be caused without generating relative movement between the second drive side (25) and the second output side (26) of the second actuating drive (12).