Electrohydraulic Brake Actuator Membrane for Pressure Equalization
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Solution Overview
Problem
Electrohydraulic brake boosters experience significant pressure differences within the housing due to rapid component movements, leading to inefficiencies and increased energy consumption.
Innovation Solution
An elastically deformable compensating membrane is integrated into the housing to equalize pressure between regions by adjusting the effective volume in response to transmission movements, reducing pressure differences and facilitating dynamic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid axial adjustment of the master brake cylinder is achieved through transmission movement, then brake pressure response speed is improved, but pressure differences between housing regions increase
Solution Approach 1:
A compensating membrane made of elastomeric material is introduced into the housing to compensate for pressure differences. The membrane is deformable and can change its deformation state in response to pressure changes, thereby equalizing pressure between the first housing region (containing the master brake cylinder) and the second housing region (facing the second opening). This flexible membrane structure allows rapid transmission movement while maintaining pressure balance.
Solution Approach 2:
The membrane's deformation state changes in response to pressure variations within the housing. When pressure differences arise due to rapid transmission movement, the membrane deforms to adjust the effective volume of the housing regions, thereby changing the pressure parameter to maintain equilibrium between regions.
2Reliability
If the housing is sealed fluid-tightly, then braking performance is improved, but pressure equalization between regions is inhibited
Solution Approach 1:
The compensating membrane serves as a flexible sealing element that closes the second opening in a fluid-tight manner while simultaneously enabling pressure equalization. The elastomeric material allows the membrane to deform under pressure differences, creating a dual-function component that maintains both sealing integrity and pressure balance.
Solution Approach 2:
The membrane acts as an intermediary element between the two housing regions. It provides a fluid-tight closure while its deformability allows it to mediate pressure differences by changing its volume, thereby enabling pressure equalization without compromising the overall fluid-tight sealing of the housing.
3Productivity
If transmission components move rapidly within the housing, then brake pressure dynamics are improved, but pressure differences and energy consumption increase
Solution Approach 1:
The elastomeric membrane compensates for pressure differences generated during rapid transmission movement, reducing the energy required to overcome pressure imbalances. By passively equalizing pressure through deformation, the membrane reduces the overall energy consumption associated with dynamic brake pressure changes.
Solution Approach 2:
The pressure differences that arise during rapid transmission movement are converted into beneficial membrane deformation. Instead of representing pure energy loss, the pressure differences cause the membrane to deform and equalize pressure, thereby reducing the net energy consumption required for dynamic brake 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
The membrane reduces pressure differences, enhances dynamic performance, lowers actuation force requirements, and optimizes energy consumption while maintaining a fluid-tight seal.
Implementation Method 1
a compensating membrane which closes the second opening in a fluid-tight, in particular liquid-tight and preferably also gas-tight manner and which is elastically deformable in order to reduce a pressure difference between the first and the second housing region
Data Source
AI summary
An electrohydraulic actuator for a brake system. The actuator includes: a housing defining an interior space and having first and second openings; a master brake cylinder positioned in the first opening and attached to the housing so that the first opening is sealed in a fluid-tight manner; an electric motor arranged on the housing; and a transmission in the interior space and kinematically coupled to the master brake cylinder. The transmission includes a transmission intermediate part which is moveable along a longitudinal axis and subdivides the housing, into a first housing region in which the master brake cylinder is arranged, and a second housing region facing the second opening. The actuator includes a compensating membrane closing the second opening in a fluid-tight manner and elastically deformable to reduce a pressure difference between the first and second housing region when an axial displacement of the transmission intermediate part occurs.