Combined Wheel Brake Layout for Parking Brake and Redundancy
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Solution Overview
Problem
Existing electromechanical wheel brakes require complex hydraulic systems and force sensors, which are expensive and space-consuming, while purely hydraulic brakes lack a parking brake function and redundancy.
Innovation Solution
A combined wheel brake system integrating hydraulic and electromechanical braking devices, where both systems act axially in opposing directions, allowing for separate control and function separation, enabling a compact design with redundancy and enhanced braking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a purely electromechanical braking system is used, then the space requirement and system complexity are reduced, but the cost increases due to expensive force sensors and the parking brake function is lost
Solution Approach 1:
The patent combines hydraulic and electromechanical braking devices into a single wheel brake system. The hydraulic braking device provides the parking brake function while the electromechanical braking device provides service braking, merging the advantages of both systems into one integrated solution that eliminates the need for separate systems.
Solution Approach 2:
The wheel brake system is designed to perform multiple functions through its dual braking devices. The hydraulic braking device can serve both as a service brake and a parking brake, while the electromechanical braking device provides additional service braking capability, creating a multi-functional system that adapts to different braking requirements.
2Adaptability or versatility
If a hydraulic braking system is used, then the parking brake function is achieved, but the system complexity and space requirement increase
Solution Approach 1:
The patent integrates the hydraulic braking device into a compact caliper assembly with the electromechanical braking device, merging two separate braking systems into one unified structure. This integration reduces the overall space requirement and simplifies the system architecture while maintaining both parking brake and service brake functions.
Solution Approach 2:
The hydraulic braking device and electromechanical braking device are arranged in a nested configuration within the brake caliper module. The friction partner is positioned between the two braking parts, allowing both devices to share the same spatial envelope and reducing the overall footprint of the braking system.
3Measurement precision
If force sensors are added to electromechanical brakes to measure clamping force, then braking control precision is improved, but the cost and complexity increase
Solution Approach 1:
The patent introduces a transmission element as an intermediary between the electromechanical braking part and the friction partner. This transmission element enables indirect measurement of clamping force through its interaction with the friction partner, providing measurement capability without requiring direct force sensors on the braking part, thus reducing complexity while maintaining measurement precision.
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 system achieves high brake application forces, reduces complexity and cost, provides a parking brake function, and ensures redundancy without the need for a separate hydraulic system, while maintaining simplicity and efficiency.
Implementation Method 1
the hydraulic braking device can act on the hydraulic braking part and move the latter axially, thereby enabling a first axial force FH to be applied during operation
Implementation Method 2
the electromechanical braking device can act on the electromechanical braking part and move the latter axially, thereby enabling a second axial force FE to be applied during operation
Implementation Method 3
A braking unit can then be arranged on the output side, and this can comprise a brake piston with a friction lining, which can be pressed against a brake disk or, alternatively, a drum by means of a translational movement. It is thereby possible to bring about deceleration during the operation of the wheel brake.
Data Source
AI summary
A wheel brake for a motor vehicle which can be operated electromechanically and/or hydraulically. The wheel brake includes a brake caliper module having at least one electromechanically operable braking device and having at least one hydraulically operable braking device.