Hydraulic Unit Pump Element Separation Point Corrosion Prevention
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Solution Overview
Problem
The existing hydraulic units for slip-controllable vehicle brake systems face corrosion issues due to the interaction of different materials and high mechanical stresses at the separation point between the pump element and the housing block, particularly at the shoulder and counter-shoulder, which act as a mechanical axial stop.
Innovation Solution
The separation point between the high-pressure and low-pressure areas of the pump element is designed with a section forming a frictional connection that faces the high-pressure area, preventing pressure medium penetration and thus isolating the axial stop from the pressure medium, which is subject to high mechanical loads and different materials, thereby preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the separation point is designed with a frictional connection section facing the low-pressure area, then the assembly is simple, but corrosion occurs at the axial stop area due to pressure medium penetration
Solution Approach 1:
The patent inverts the conventional design by orienting the frictional connection section to face the high-pressure area instead of the low-pressure area. This reversal prevents pressure medium penetration to the axial stop, eliminating corrosion while maintaining assembly simplicity through the same frictional connection mechanism.
Solution Approach 2:
The patent converts the harmful effect of high-pressure medium into a beneficial sealing mechanism. By positioning the frictional connection to face the high-pressure area, the pressure medium is prevented from reaching the axial stop, transforming what would be a corrosive environment into a protective barrier that keeps the stop area dry and corrosion-free.
2Strength
If the pump element is pressed into the pump receptacle with high press-in forces, then the frictional connection is strong, but the mechanical axial stop is subjected to high mechanical stresses
Solution Approach 1:
The patent extracts the axial stop function from the pressure-bearing interface. By positioning the frictional connection to face the high-pressure area and the axial stop to face the low-pressure area, the design separates the functions: the frictional connection handles both mechanical strength and pressure sealing, while the axial stop only provides positioning without bearing mechanical or pressure loads.
3Ease of operation
If the shoulder and counter-shoulder are exposed to pressure medium, then the pump element can be assembled, but corrosion occurs due to interaction of different materials with pressure medium as electrolyte
Solution Approach 1:
The patent introduces a functional intermediary arrangement where the frictional connection section acts as a barrier between the pressure medium and the axial stop area. This intermediary positioning prevents direct contact between the corrosive pressure medium (electrolyte) and the dissimilar material interface, eliminating galvanic corrosion while maintaining assembly functionality.
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 design effectively prevents corrosion at the axial stop area, ensuring the components remain dry and free from pressure medium, enhancing the durability and reliability of the hydraulic unit without increasing space requirements or assembly costs.
Implementation Method 1
a section which forms a frictional connection and which, according to the invention, faces the high-pressure area of the pump element
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a hydraulic unit, particularly for a slip-controllable vehicle brake system, said unit comprising a housing block (10), a pump receptacle (12) formed on the housing block (10), and a pump element (14) inserted into the pump receptacle (12). The pump element (14) forms a separating point (70) together with the housing block (10), which separating point hydraulically separates a low-pressure region (50) of the pump element (14) from a high-pressure region (56). Known separating points (70) are divided into sections, wherein a first section (72; 84) forms a force closure between the housing block (10) and the pump element (14) and a second section (74; 86) forms an axial stop (88), at which the pump element (14) mechanically abuts the housing block (10). Pressure medium, which is under high pressure, from the high-pressure region (56) of the pump element (14) can reach the section (74; 86) of the separating point (70) that forms the axial stop (88) and can cause corrosion between the housing block (10) and the pump element (14) there together with the component stresses occurring there. The invention proposes arranging the section (72; 84) of the separating point (70) forming the force closure so that it faces the high-pressure region (56) of the pump element (14). Thus, access of pressurized pressure medium to the section (74; 86) of the separating point (70) forming an axial stop (88) is prevented and corrosion is avoided.