Pressure Control Valve Flow Guide with Helical Channels
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Solution Overview
Problem
Existing pressure control valves in motor vehicle automatic transmissions face challenges in achieving good valve dynamics while maintaining low leakage, with design complexity and temperature-dependent performance issues, particularly at low oil temperatures.
Innovation Solution
A pressure control valve device with a flow guide featuring helical channel areas that impart a vortex-shaped flow pattern to the fluid, reducing interference and damping fluid particles, thereby enhancing stability and response times, and eliminating the need for a separate damping device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a flow guide element is provided to dampen pressure fluctuations, then pressure stability is improved, but hydraulic resistance increases and valve dynamics deteriorate
Solution Approach 1:
The flow guide element features a curved flow path that guides hydraulic fluid from the inlet area to the outlet area in a smooth arc rather than a straight line. This curvature allows the fluid to change direction gradually, reducing turbulence and eddy formation while maintaining low flow resistance. The curved geometry achieves pressure stabilization without the adverse effects of sharp angles or abrupt flow direction changes.
2Stability of the object's composition
If damping elements are added to reduce pressure fluctuations, then pressure stability is improved, but device complexity increases
Solution Approach 1:
The flow guide element is integrated directly into the valve body structure, combining the functions of fluid guidance and pressure stabilization in a single component. This eliminates the need for separate damping elements or additional structural features, achieving pressure fluctuation reduction without increasing device complexity. The flow guide serves dual purposes: directing fluid flow and stabilizing pressure through its geometric design.
3Productivity
If the inlet geometry is enlarged to improve valve dynamics at low temperatures, then valve dynamics are improved, but leakage increases at high temperatures
Solution Approach 1:
The flow guide element's curved geometry and optimized flow path parameters enable the inlet geometry to maintain good valve dynamics across a wide temperature range without excessive leakage. By carefully designing the flow guide's curvature radius and length, the system achieves a balance where fluid viscosity changes due to temperature have minimal impact on both valve dynamics and leakage performance.
4Loss of energy
If straight flow paths are used, then flow resistance is low, but Venturi effects and pressure fluctuations occur
Solution Approach 1:
The flow guide element introduces a controlled curvature to the flow path, transforming the straight flow path into a smooth arc. This curvature prevents Venturi effects by avoiding abrupt constrictions and sharp direction changes, while the gradual flow direction changes maintain low flow resistance. The curved geometry stabilizes pressure by eliminating the turbulence and eddies that would occur with straight or angular flow paths.
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 device achieves improved valve dynamics and reduced leakage with simpler design, maintaining performance across temperature ranges and reducing production costs by minimizing flow resistance and eddy formation, while providing sharper cutoff frequency steps and better disturbance suppression.
Implementation Method 1
A flow guide device with an inflow area and an outflow area spaced apart from one another in the axial extension of the flow guide device, for defined guidance of the flow of fluid flowing from the inlet area toward the second poppet valve, is provided upstream from the second poppet valve, between the first outlet area and the second outlet area. The flow guide device is provided with a plurality of channel areas separated from one another, in such manner that a vortex-shaped flow pattern is imparted to the fluid flowing through the channel areas of the flow guide device in the direction of the second poppet valve downstream from the outflow area.
Data Source
AI summary
A pressure control valve device with at least one inlet area and first and second outlet areas which can be connected by two poppet valves. A flow guide device (21), with inflow and outflow areas (22, 23) for guiding the fluid flowing from the inlet area in a defined manner in the direction of the second poppet valve, is located upstream of the second poppet valve, between the first and second outlet areas. The fluid in the flow guide device (21) passes in the area between the inflow and outflow areas (22, 23) through a plurality of channel areas distributed around the periphery of the flow guide device (21) and separated from one another, which are shaped at least approximately helically and impart an at least approximately vortex-like flow pattern to the fluid flowing in the direction of the second poppet valve downstream of the outflow area (23).