Accumulator Piston Recess for Particle Separation
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Solution Overview
Problem
Pressure medium accumulators in electronically slip-controllable vehicle brake systems face issues with impurities, such as hard particles, damaging sealing and guide rings and causing system failures due to particle blockages, which existing technologies fail to address effectively without separate filter devices.
Innovation Solution
The accumulator piston features a piston head with a blind-hole-shaped recess having a tapered cross-section and a shoulder, deflecting the pressure medium flow multiple times to separate particles, preventing them from being entrained and causing damage, thus eliminating the need for separate filter devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate filter devices are added to remove particles from pressure medium, then particle separation effectiveness is improved, but device complexity and flow losses increase
Solution Approach 1:
The patent merges the particle separation function with the accumulator piston by integrating a circumferential recess with tapered cross-section directly into the piston structure. This combines two functions (accumulation and filtration) into a single component, eliminating the need for separate filter devices while maintaining particle separation effectiveness.
Solution Approach 2:
The accumulator piston is designed with multi-functionality by incorporating the tapered recess that serves dual purposes: maintaining pressure medium accumulation while simultaneously acting as a particle separator. The tapered geometry creates flow forces that remove particles without requiring additional dedicated filtration components.
2Reliability
If separate filter devices are added to remove particles from pressure medium, then particle separation effectiveness is improved, but flow rate and pressure build-up dynamics decrease due to flow losses
Solution Approach 1:
By integrating the separation function into the accumulator piston itself, the patent eliminates additional filter components that would create flow resistance. The tapered recess is positioned within the existing piston structure, allowing particles to be removed without introducing extra flow paths or restrictions that would reduce flow rate and pressure build-up dynamics.
3Reliability
If the recess cross-section is smaller at the opening than at the base, then particle separation is improved through flow deflection, but pressure loss increases
Solution Approach 1:
The recess is designed with non-uniform cross-sectional dimensions that are smaller at the opening than at the base, creating localized flow deflection zones. This tapered geometry concentrates flow forces at specific locations to maximize particle separation effectiveness while minimizing overall pressure loss by maintaining adequate flow passages elsewhere in the piston structure.
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 solution enhances the robustness of the pressure medium system by increasing flow rate and pressure build-up dynamics while reducing mechanical load and undesired eddies, achieving effective particle separation without additional costs or components.
Implementation Method 1
The pressure medium flowing through the pressure medium accumulator is deflected by a recess designed according to the disclosure on its path through the pressure medium accumulator and, owing to the flow forces effective during this, is removed of particles contained in the pressure medium.
Data Source
AI summary
An accumulator piston, in particular a piston for a pressure medium accumulator of a hydraulic unit of an electronically slip-controllable vehicle brake system, includes a cylindrical piston shaft, and a piston head covering the piston shaft. The piston head includes a circumferentially closed blind-hole-shaped recess having an opening. A cross section of the recess in a region of the opening has at least one smaller dimension than a cross section in a region of a base of the recess opposite the opening. The recess forms a mechanism configured to separate particles out from the pressure medium.