Electromechanical Brake Piston Chamber Venting Against Pressure Wear
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Solution Overview
Problem
Electromechanical brakes experience premature wear due to changes in gas pressure within the piston chamber caused by temperature changes and piston movement, which is not adequately addressed by existing designs.
Innovation Solution
Incorporation of a venting device that allows for pressure equalization between the piston chamber and the exterior environment, using a venting opening and flow passage connected to the brake carrier, optionally with a filter element to prevent contamination, and utilizing the vehicle interior or electrical power cable for ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the actuating piston is received in a gas-tight manner in the piston chamber, then protection against dirt and contaminants is improved, but pressure changes due to temperature and piston movement cause premature wear
Solution Approach 1:
A venting device is introduced as an intermediary element between the piston chamber and the exterior environment. This device includes a venting opening that allows pressure equalization while a filter element acts as a mediator to block contaminants. The filter element serves as the intermediary that simultaneously enables gas exchange and prevents dirt penetration, resolving the contradiction between sealing and venting requirements.
2Quantity of substance
If the piston chamber is sealed to prevent contaminant entry, then cleanliness is improved, but pressure changes during operation reduce reliability
Solution Approach 1:
The venting device implements local quality by creating a specialized region (venting opening with filter element) that has different properties from the rest of the sealed piston chamber. The filter element provides localized permeability to gas while maintaining impermeability to contaminants, allowing the overall system to remain sealed while permitting necessary pressure equalization in a specific localized area.
3Reliability
If a venting device is added to equalize pressure, then component wear is reduced, but device complexity increases
Solution Approach 1:
The venting function is extracted as a separate, independent component (venting device with filter element) from the main piston chamber assembly. This extraction allows the venting mechanism to be designed and implemented as a simple add-on element rather than integrating complexity into the core piston chamber structure. The filter element can be a simple replaceable component, minimizing overall system complexity while achieving the reliability benefit.
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 venting device effectively counters premature wear by equalizing pressure and preventing the ingress of dirt and moisture, thereby protecting the brake components and enhancing their longevity.
Implementation Method 1
a measure is taken to counteract premature signs of wear on components of the electromechanical brake. This is because the venting device can be used to achieve or promote ventilating or venting of the electromechanical brake for the purpose of pressure equalization between the piston chamber and the exterior
Implementation Method 2
A filter element can be assigned to the venting opening, for example in order to at least partially prevent dirt particles and/or moisture particles from penetrating into the piston chamber
Data Source
AI summary
The disclosure relates to an electromechanical brake for a motor vehicle. The electromechanical brake comprises an actuating piston which is set up to be moved translationally in a direction of a piston axis in order to actuate at least one brake shoe. The electromechanical brake also comprises a brake carrier having a gas-containing piston chamber in which the actuating piston is received such that it can be moved translationally in a direction of the piston axis. Furthermore, the electromechanical brake comprises an electric motor for driving the actuating piston. In the case of the electromechanical brake, a venting device is provided, which is set up to vent the piston chamber with respect to an exterior. The disclosure also relates to a disc brake, to a brake system, and to a motor vehicle.