Electromechanical Drum Brake Shoe Support for Eccentricity Compensation
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Solution Overview
Problem
Existing drum brakes face challenges in compensating for out-of-roundness and eccentricity, leading to uneven wear and complex mechanical designs.
Innovation Solution
An electromechanical drum brake design featuring a support means, such as semi-annular expansion clips, that allows brake shoes to move and adjust position relative to the drum, compensating for out-of-roundness and eccentricity without complex mechanical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If brake shoes are firmly positioned by support bearing and return springs, then positioning simplicity is improved, but ability to compensate out-of-roundness and eccentricity deteriorates
Solution Approach 1:
The brake shoe positioning system transitions from a static, fixed positioning mechanism to a dynamic system where brake shoes can move axially within the drum. The brake shoes are guided by the drum surface itself through friction contact, allowing automatic adjustment to compensate for out-of-roundness and eccentricity while maintaining positioning functionality.
2Stability of the object's composition
If brake shoes are supported on pivot bearing, then consistent kinematics is improved, but mechanical complexity deteriorates
Solution Approach 1:
The pivot bearing support mechanism is completely removed from the system. Instead of using separate support bearings to maintain kinematic consistency, the invention extracts the positioning function to the drum surface itself, which guides the brake shoes through controlled friction contact, eliminating the need for additional support components.
Solution Approach 2:
The drum surface serves multiple functions: it provides the braking contact surface, guides the brake shoe movement, and compensates for out-of-roundness and eccentricity. By making the drum multi-functional, the invention eliminates the need for separate pivot bearings while maintaining kinematic consistency.
3Force
If spreading force is applied directly to brake shoes, then actuation effectiveness is improved, but wear uniformity deteriorates
Solution Approach 1:
The drum surface acts as an intermediary between the brake shoe and the support system. The brake shoes are pressed against the drum surface during actuation, and the drum surface guides their movement, ensuring that the spreading force is effectively transmitted while allowing the brake shoes to self-adjust for uniform wear.
Data Source
AI summary
An electromechanical drum brake for a motor vehicle. The electromechanical drum brake includes a drum, in which brake shoes are arranged, and an adjusting device, which is arranged between the brake shoes and driven by a drive unit and via which the brake shoes can be spread for braking. An end of each brake shoe that faces the adjusting device is supported on a support element cooperating with the adjusting device, movably in relation to the support element, wherein a spreading force of the adjusting device is transferable to the brake shoes via the support element.