Integrated Fixing Element for Electromechanical Brake Actuator
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Solution Overview
Problem
Existing electromechanical brake actuators for motor vehicles face challenges in providing a powerful, compact, and lightweight design that ensures stable mechanical fixing of gear components to reduce volume, weight, and increase service life, while avoiding operational failures due to external damage.
Innovation Solution
A subassembly for an electromechanical brake actuator featuring a drive device with an electric motor and a gear device, where a fixing element integrates an internal-toothed wheel, reducing the number of components and securing them without direct contact with the housing, thus enhancing compactness, reliability, and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gear components are supported directly on the housing, then the construction is simplified, but the reliability decreases due to vulnerability to external damage
Solution Approach 1:
The patent introduces a carrier element as an intermediary component between the housing and the gear components (planet gears, sun gear, ring gear). This carrier element absorbs external impacts and prevents them from being transmitted directly to the gear components, thereby protecting the gear train while maintaining construction simplicity. The carrier element acts as a shock-absorbing interface that decouples the gear components from direct housing support.
2Power
If a multiple-stage planet gear is used to achieve high torque reduction, then the torque transmission capability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple gear stages (first planet gear stage, second planet gear stage, and final drive gear) into a single integrated gear train system. The carrier element serves as a common support structure for all gear components, merging the support function across multiple stages. This integration achieves high torque reduction ratios while managing complexity through unified design and common mounting structures.
3Weight of stationary object
If the number of individual parts is reduced through integration, then the weight and manufacturing cost decrease, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the gear system into modular components (planet gears, sun gear, ring gear, carrier element) that can be manufactured separately with standard precision tolerances and then assembled. This segmentation allows each component to be produced using conventional manufacturing processes without requiring ultra-precise integrated manufacturing, thereby reducing overall manufacturing complexity while maintaining acceptable weight through selective integration of critical components.
Data Source
AI summary
The invention relates to a subassembly for a brake actuator which is provided for an electromechanically operated parking brake. The subassembly comprises a drive device and gear device for generating and transmitting a torque to a brake device and a fixing element which secures the arrangement of the gear device relative to the drive device, an internal-toothed wheel of the gear device being integrated in the fixing element.