Oval Cross-Section Duct for ABS Valve Flow Loss Reduction
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Solution Overview
Problem
Existing ABS pressure control valve arrangements experience significant flow losses due to abrupt divergions in pressure medium ducts, which hinder the fast dynamics required for pressure reduction and other functions during wheel slip conditions, and cannot be improved by enlarging flow cross sections due to spatial constraints.
Innovation Solution
The pressure medium ducts are produced together with the housing using primary forming, with an oval cross section where the major dimension is in a common plane and the minor dimension is perpendicular, allowing for optimized flow diversion and reduced flow resistance without cutting manufacturing, enabling a knee-like flow-guiding surface to minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure medium ducts are manufactured using cutting processes with vertical and horizontal bores, then the housing does not need to be re-clamped during manufacturing, but abrupt flow diversion occurs at the intersection region causing relatively large flow losses
Solution Approach 1:
The patent changes the geometric parameters of the pressure medium duct by forming it as an integrated oval cross-section duct during primary housing formation rather than using separate vertical and horizontal bores. This geometric parameter change eliminates the abrupt 90-degree intersection and enables smooth flow diversion, reducing flow losses while maintaining manufacturing simplicity through single-stage production.
Solution Approach 2:
The patent applies curvature by designing the pressure medium duct with a smooth, curved flow path instead of straight intersecting bores. The oval cross-section and curved diversion path eliminate sharp corners and abrupt direction changes, allowing pressure medium to flow smoothly around the bend without creating turbulence or eddy currents that would cause energy losses.
2Loss of energy
If the flow cross sections of pressure medium ducts are enlarged to reduce flow losses, then flow resistance decreases, but the installation width of the pressure control valve arrangement increases which is not permissible due to restricted spatial conditions
Solution Approach 1:
The patent utilizes the third dimension by orienting the oval cross-section of the pressure medium duct such that its major dimension lies in the plane of flow direction while the minor dimension extends perpendicular to this plane. This dimensional arrangement allows the duct to accommodate larger effective flow area without increasing the horizontal installation width, as the additional cross-sectional area is achieved through vertical orientation of the oval's major axis.
Solution Approach 2:
The patent employs asymmetric orientation of the oval cross-section where the major dimension is aligned with the flow direction plane and the minor dimension is perpendicular to it. This asymmetric configuration optimizes the flow path by providing larger cross-sectional area in the direction that matters for flow capacity while keeping the duct compact in the vertical direction, thus reducing flow resistance without increasing installation footprint.
3Ease of manufacture
If pressure medium ducts are formed by primary forming processes, then manufacturing integration is improved, but the cross-sectional shape must be optimized to minimize flow losses during diversion
Solution Approach 1:
The patent applies curvature by designing the pressure medium duct with a smooth, curved flow path instead of straight intersecting bores. The oval cross-section and curved diversion path eliminate sharp corners and abrupt direction changes, allowing pressure medium to flow smoothly around the bend without creating turbulence or eddy currents that would cause energy losses.
Solution Approach 2:
The patent changes the geometric parameters of the pressure medium duct by forming it as an integrated oval cross-section duct during primary housing formation rather than using separate vertical and horizontal bores. This geometric parameter change eliminates the abrupt 90-degree intersection and enables smooth flow diversion, reducing flow losses while maintaining manufacturing simplicity through single-stage production.
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 approach reduces flow resistance and enhances the dynamics of the pressure control valve arrangement, ensuring faster pressure dissipation, holding, and increasing phases without increasing the valve's dimensions, thus improving ABS system performance.
Implementation Method 1
the cross section of the pressure medium duct is of oval configuration, and the major dimension (principal axis) of the oval cross section and the central axis of the pressure medium duct are arranged in a common plane, whereas the minor dimension (secondary axis) of the oval cross section is perpendicular to the plane
Data Source
AI summary
A pressure control valve arrangement is described for controlling a fluid pressure in an ABS brake system of a vehicle such that, in the event of a tendency of individual wheels of the vehicle to lock, the brake pressure in at least one associated brake cylinder can be adaptively adjusted, including: a housing in which is formed at least one pressure-medium-conducting pressure medium duct and in which is provided a diversion of the flow of the pressure medium within the pressure medium duct from a portion of the pressure medium duct leading in one direction into a portion of the pressure medium duct leading in another direction, in which the pressure medium duct is produced together with the housing by primary forming, and in which the cross section of the pressure medium duct is oval and the major dimension of the oval cross section and the central axis of the pressure medium duct are arranged in a common plane, and the minor dimension of the oval cross section is perpendicular to the plane.