Drum Brake Transverse Offset Compensation via Curved Bearing
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Solution Overview
Problem
Conventional hydraulic drum brakes are not suitable for precise closed-loop control in modern electronically controlled drivetrain/brake systems and fail to effectively handle friction lining wear, leading to transverse offset and force imbalances over the vehicle's service life.
Innovation Solution
A transverse offset compensation device is integrated into the drum brake system, featuring a joint-like bearing arrangement with curved arcuate geometry, allowing for adaptive compensation of wear-induced offsets without electrical assistance, enhancing force flow and closed-loop control efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydraulic drum brakes are used, then the brake system can be implemented with standard hydraulic actuators, but the system cannot maintain precise closed-loop control over the service life due to friction lining wear
Solution Approach 1:
The support bearing geometry is changed from a standard cylindrical shape to a specifically contoured geometry with optimized radius of curvature. This parameter change in the bearing shape allows the contact point to automatically adjust its position as the friction lining wears, maintaining the force flow alignment and enabling precise closed-loop control throughout the entire service life of the brake system.
Solution Approach 2:
The support bearing is designed with a contoured geometry that enables dynamic adaptation of the contact point position. As the friction lining thickness changes during service, the contact point automatically moves along the contoured surface, allowing the system to dynamically compensate for wear and maintain optimal force transmission without requiring active control mechanisms.
2Ease of operation
If standard spreading devices are used, then the brake shoe spreading function is achieved, but transverse offset and force imbalances develop due to friction lining wear
Solution Approach 1:
The support bearing geometry is specifically contoured with optimized radius of curvature parameters. This geometric parameter change ensures that as the friction lining wears, the contact point position shifts in a controlled manner that maintains proper force flow alignment, preventing transverse offset and force imbalances while preserving ease of operation.
Solution Approach 2:
The support bearing features an asymmetric contoured geometry rather than a symmetric cylindrical shape. This asymmetric design allows the contact point to follow a specific trajectory during wear, compensating for the asymmetric wear patterns that occur in drum brakes and maintaining brake shoe alignment precision throughout the service life.
3Ease of manufacture
If simple support bearing geometry is used, then manufacturing is easier, but wear-induced transverse offset cannot be compensated
Solution Approach 1:
The support bearing is manufactured with a specifically contoured geometry defined by optimized radius of curvature parameters. While more complex than a simple cylinder, this contoured shape can be produced using standard machining or molding processes, providing a practical balance between ease of manufacture and the ability to compensate for wear-induced transverse offset.
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 automatically compensates for wear-induced transverse offsets, improving the precision and reliability of closed-loop control in drum brake systems, reducing wear-related displacement and transverse forces, and ensuring consistent brake performance throughout the service life.
Implementation Method 1
a joint-like or movable bearing arrangement based on an articulated positive guide. For this purpose, a track guide of 2-dimensionally curved arcuate shape may be implemented
Data Source
AI summary
A drum brake for an electrical motor vehicle brake system wherein actuator means, a transmission means and a spreading device are in a force flow with movably mounted drum brake shoes that are suitable and designed to cooperate with a brake drum. The force flow, in a electromechanically actuatable drum brake such that closed-loop electrical brake control in conjunction with simple actuator control is made possible with reduced outlay over the entire wearing service life of the brake shoe. Transverse offset compensation is provided by way of, a joint-disk-type/joint-socket-type bearing geometry such that a friction lining bearing support geometry with profiling allowing mutual articulation such that transversely oriented lining displacement with respect to the a direction is at least reduced.