Self-Locking Brake Gear Train Force Diversion
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Solution Overview
Problem
Existing motor vehicle brakes with self-locking devices for parking brake functions suffer from low efficiency and require powerful components with high power consumption, and the design is bulky due to the need to absorb reactive forces, which also leads to wear and space inefficiency.
Innovation Solution
The self-locking device is integrated into the gear train, and a force conducting element, such as a receptacle body, is used to divert reactive forces directly into the brake housing, allowing for a more compact design and reduced wear, with a wrap spring clutch for efficient torque transfer and blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a self-locking device is integrated into the gear train, then the brake system becomes more compact and efficient, but the reactive forces must be effectively diverted without causing wear
Solution Approach 1:
The self-locking device is extracted from the traditional positioning near the brake piston and integrated into the gear train. This relocation allows the reactive forces to be diverted through the gear train structure itself, preventing wear on critical braking components while maintaining compact dimensions.
Solution Approach 2:
The self-locking device is merged with the gear train structure, combining the locking function with the existing mechanical transmission system. This integration eliminates the need for separate force absorption structures, reducing overall system volume while managing reactive forces through the gear train's inherent structural pathways.
2Volume of moving object
If a self-locking device is positioned near the spindle-nut arrangement, then installation space is reduced, but the device must absorb full reactive forces requiring substantial size
Solution Approach 1:
The self-locking device is extracted from its traditional position near the brake piston and relocated to the gear train. This extraction allows the device to be smaller since it no longer needs to absorb full reactive forces alone, while the gear train structure provides additional force distribution pathways.
3Reliability
If a worm gear is used for self-locking, then the parking brake function is secure, but the efficiency is very low requiring powerful motors with high power consumption
Solution Approach 1:
The gear train is designed to serve multiple functions: power transmission during normal operation and self-locking during parking brake activation. By integrating the self-locking function into the existing gear train rather than using a dedicated worm gear, the system achieves reliable locking while maintaining higher overall efficiency during dynamic operation.
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
This configuration enhances the diversion of reactive forces with reduced effort and wear, enabling a more efficient and compact brake system with improved power usage and reduced component size.
Implementation Method 1
one switch element (84) assigned to the wrap spring clutch (70), which allows a transfer of torque from the motor drive (22) to the spindle (76) within a certain degree of deformation and which blocks a transfer of torque from the spindle (76) to the motor drive (22) beyond a certain degree of deformation
Data Source
AI summary
A motor vehicle brake, in particular a combined hydraulically and electromechanically actuated motor vehicle brake, comprising an actuator subassembly that includes: a brake housing, an actuation member, which is movable in relation to the brake housing, for hydraulically or electromechanically moving a brake lining, a motor-operated drive, a moving mechanism between the motor-operated drive and the movable actuation member, a gear train associated with the moving mechanism, and a separate self-locking device which is designed to block the moving mechanism as needed. The gear train includes at least two gear stages. The disclosed motor vehicle brake is characterized in that the self-locking device is arranged on the gear train in such a way that reactive forces of the self-locking device that occur during the self-locking action can be deflected into the brake housing via a force guiding member.