Electromechanical Actuation Unit for Motor Vehicle Brake
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Solution Overview
Problem
Existing motor vehicle brake systems lack an efficient electromechanical actuation unit that can provide a parking brake function while allowing rapid actuation during service braking and occupying minimal installation space, especially in drum brake configurations.
Innovation Solution
An electromechanical actuation unit for motor vehicle brakes, featuring an electromechanical actuation device with a drive element, drive spindle, and elastic element, which enables both service braking and parking brake functions through elastic deformation, mechanical locking, and adaptive wear compensation, utilizing a coupling mechanism with self-locking threads and actuating nuts for compact and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electromechanical actuation device is designed to provide both service braking and parking brake functions, then the device complexity increases, but the installation space requirement increases and actuation speed during service braking decreases
Solution Approach 1:
The electromechanical actuation device is designed to perform both service braking and parking brake functions using a single integrated structure. The drive element with integrated drive spindle and coupling element enables the device to switch between rapid service braking actuation and elastic-deformation-based parking brake actuation, eliminating the need for separate actuation mechanisms.
Solution Approach 2:
The actuation device is segmented into functional modules: a drive element, an integrated drive spindle, and a coupling element. This segmentation allows each component to be optimized for its specific function while maintaining overall compactness, reducing total device complexity despite the dual-function requirement.
2Adaptability or versatility
If an electromechanical actuation device is designed to provide both service braking and parking brake functions, then the device complexity increases, but the installation space requirement increases
Solution Approach 1:
The drive spindle is integrated directly into the drive element, eliminating the need for separate mounting structures and reducing overall device volume. The coupling element serves dual purposes by enabling both service braking torque transmission and parking brake elastic deformation, merging multiple functions into a single compact assembly that minimizes installation space in drum brake configurations.
Solution Approach 2:
The coupling element is nested within the integrated drive spindle structure, with the elastic element positioned inside the drive element. This nested arrangement allows multiple components to occupy overlapping spatial volumes, significantly reducing the overall installation footprint while maintaining all necessary functional capabilities.
3Adaptability or versatility
If an electromechanical actuation device is designed to provide both service braking and parking brake functions, then the device complexity increases, but the actuation speed during service braking decreases
Solution Approach 1:
The coupling element is designed with dynamic characteristics that allow it to respond differently based on the actuation mode. During service braking, the coupling element rigidly transmits torque for rapid actuation. During parking brake activation, the elastic element allows controlled elastic deformation, enabling the same structure to support both high-speed service braking and sustained parking brake functions without compromising actuation speed.
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 enables rapid and reliable service braking while maintaining a permanent parking brake function, with adaptive wear compensation and a compact design suitable for drum brakes, ensuring efficient use of limited space and effective brake operation.
Implementation Method 1
the at least one elastic element being elastically deformable for a parking brake function
Implementation Method 2
The externally threaded portion on the at least one stop element can interact with an internally threaded portion on the housing of the actuation device. The thread of the externally threaded portion and the internally threaded portion can be self-locking.
Data Source
AI summary
The present disclosure relates to an electromechanical actuation unit for a motor vehicle brake comprising: at least one electromechanical actuation device for actuating at least one brake shoe of the motor vehicle brake. The electromechanical actuation device has at least drive element and at least one drive spindle, wherein the at least one drive element drives the at least one drive spindle. The electromechanical actuation device has at least one elastic element, the at least one elastic element being elastically deformable for a parking brake function.