Disc Brake Adjusting Device Clutch Control
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Solution Overview
Problem
Existing mechanically driven and mechanically acting adjustment devices for pneumatically actuated disc brakes face challenges in efficiently adjusting brake pad clearance due to high holding friction torques, leading to slow correction of spontaneously occurring reductions in clearance caused by vibrations, incorrect adjustments, and wear-related changes.
Innovation Solution
The adjustment device incorporates a mechanism with defined infeed and reverse rotation strokes, terminated by clutches, allowing for precise control of clearance adjustments and avoiding the influence of indirectly measurable component parameters like friction coefficients, featuring a gear with a switchable clutch, a splined shaft-hub connection, and ball ramp clutches for efficient torque management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high holding friction torques are used to prevent unintended brake clearance changes, then brake clearance stability is improved, but the speed of clearance correction is reduced
Solution Approach 1:
The adjusting device transitions from a static high-friction locking mechanism to a dynamic clutch-controlled mechanism. The clutch can be actively engaged or disengaged based on operational needs, allowing the system to switch between stable holding mode and rapid adjustment mode, thereby resolving the contradiction between stability and correction speed.
Solution Approach 2:
The system changes the friction parameter dynamically by using a clutch mechanism that can be engaged or disengaged. When the clutch is engaged, friction is high for stability; when disengaged, friction is low for rapid correction. This parameter change allows the system to overcome the trade-off between stability and correction speed.
2Reliability
If mechanically driven adjusting devices are used to compensate for wear, then brake pad clearance adjustment is achieved, but the correction process is slow due to friction
Solution Approach 1:
The clutch mechanism enables dynamic control of the adjustment process. During normal operation, the clutch remains engaged for stable clearance maintenance. When correction is needed, the clutch is temporarily disengaged to allow rapid adjustment, significantly reducing correction time while maintaining compensation capability.
Solution Approach 2:
The adjusting device operates in periodic cycles: the clutch is engaged for stable operation, then briefly disengaged for rapid correction when needed, and re-engaged afterward. This periodic engagement/disengagement pattern enables both reliable clearance compensation and fast correction when deviations occur.
3Adaptability or versatility
If bidirectional adjustment mechanisms are used to increase and decrease clearance, then adjustment flexibility is improved, but device complexity increases
Solution Approach 1:
The clutch-controlled mechanism provides bidirectional adjustment capability through dynamic control. By engaging or disengaging the clutch at different times during brake application, the system can achieve both clearance increase and decrease functions without requiring complex bidirectional mechanical structures, thus maintaining simplicity while achieving flexibility.
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
This solution enables precise and efficient adjustment of brake pad clearance, reducing the impact of friction torques and allowing for quick correction of clearance deviations, improving the resistance to wear and vibration effects, while maintaining a defined operating state for precise component production.
Implementation Method 1
ball ramp clutches for efficient torque management
Implementation Method 2
threaded spindle, wherein the feed stroke and the return stroke of the threaded spindle can be terminated by switching one or more clutches
Implementation Method 3
feed stroke and the return stroke of the threaded spindle can be terminated by switching one or more clutches
Data Source
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AI summary
The invention relates to an adjusting device (1) for compensating for the wear of a brake lining or multiple brake linings and/or a brake disc of a pneumatically actuatable disc brake for a vehicle. The adjusting device (1) has a mechanical actuator (3), and the mechanical actuator (3) converts a rotational movement of a brake lever (5) into a rotational movement of a shaft (10). The shaft (10) rotates at least one threaded spindle (19) which acts on one of the brake linings. The invention is characterized in that the adjusting device (1) can carry out an advancing movement and a return movement of the threaded spindle (19), and the advancing movement and the return movement of the threaded spindle (26) can be terminated by switching one or more couplings (29, 30, 32).