Electromechanical Drum Brake With Floating Rack Force Compensation
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Solution Overview
Problem
Existing electromechanical drum brakes require significant mechanical effort to ensure force compensation and optimal braking performance, which can lead to increased design complexity and effort.
Innovation Solution
An electromechanical drum brake design featuring a floatingly mounted rack and a coupling gear that moves freely between the brake shoes, allowing for force compensation and optimal placement of the brake shoes against the drum, thereby improving braking efficiency and reducing design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical actuation with S-Cam and wedge is used to ensure force compensation, then force balance between brake shoes is achieved, but device complexity and mechanical effort increase significantly
Solution Approach 1:
The patent replaces complex mechanical force compensation mechanisms (S-Cam, wedge) with a simplified mechanical system using a coupling gear and rack that enables automatic force balance through gear rotation, reducing the number of mechanical elements while maintaining reliability
Solution Approach 2:
The coupling gear automatically balances forces between brake shoes through its own rotation mechanism, eliminating the need for additional active control systems or complex mechanical elements to achieve force compensation
2Ease of operation
If additional mechanical elements are added to ensure low-friction displacement of actuator parts, then actuation smoothness is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical elements designed to ensure low-friction displacement with a simpler gear-based mechanism where the coupling gear rotates on the rack, providing smooth actuation through inherent mechanical advantage without additional friction-reducing components
3Stability of the object's composition
If the rack is fixed in relation to the drum, then structural stability is improved, but force compensation capability is lost
Solution Approach 1:
The patent transforms the rack from a fixed component to a dynamic element that can move longitudinally within the drum, allowing the coupling gear to rotate on the rack and automatically balance forces between brake shoes while maintaining overall structural stability
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 proposed design achieves improved braking efficiency by balancing forces between the brake shoes, reducing the mechanical effort required for actuation, and simplifying the design, which leads to a more efficient and cost-effective electromechanical drum brake system.
Implementation Method 1
the coupling gear can move freely on the rack between the brake shoes so that force differences that occur between the brake shoes can be compensated by rotating the coupling gear
Implementation Method 2
The rack can move along its longitudinal extension so that it moves between the brake shoes
Implementation Method 3
the brake shoes can be optimally placed against the drum so that they can develop their self-reinforcing properties
Data Source
AI summary
An electromechanical drum brake for a motor vehicle. The electromechanical drum brake includes a drum, in which brake shoes are disposed, and an adjusting device, which is disposed between the brake shoes and driven by a drive unit, using which the brake shoes can be spread apart for braking. The adjusting device includes a rack driven by the drive unit, is floatingly mounted between the brake shoes and is in engagement with a coupling gear that acts on a first brake shoe via a push rod connected to it. An actuating rack which acts on a second brake shoe is in engagement with the coupling gear on a side of the coupling gear opposite to the rack, and the coupling gear can move freely on the rack between the brake shoes so that force differences that occur between the brake shoes can be compensated by rotating the coupling gear.