Valve Device Flow Guide Swirl for Pressure Stability
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Solution Overview
Problem
Current proportional pressure control valves in motor vehicle transmissions are sensitive to pressure fluctuations, leading to difficulties in adjusting operation pressure and causing shift behavior issues due to inflow pressure dependence, especially at low load conditions.
Innovation Solution
A valve device with a cone poppet valve and a flow guide device that creates a swirl in the fluid flow, reducing pressure fluctuations by using a cone angle of 60°+/−10° and a narrowing inner space ratio of 1.5+/−0.1, along with a second flow guide device upstream of the first poppet valve to stabilize the fluid characteristic and reduce inflow pressure sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional proportional pressure control valves are used, then pressure control function is provided, but the valve is sensitive to pressure fluctuations causing difficulty in adjusting operation pressure
Solution Approach 1:
A flow guide device is introduced as an intermediary component between the inflow area and the poppet valve. This flow guide device shapes the fluid flow to reduce pressure fluctuations and stabilize the flow characteristics, thereby protecting the poppet valve from direct exposure to fluctuating pressure while maintaining controllable operation pressure adjustment
Solution Approach 2:
The patent modifies the flow parameters by introducing a flow guide device that changes the flow velocity distribution and pressure distribution. The flow guide device creates a more uniform flow pattern with reduced pressure fluctuations, transforming the unstable flow parameters into stable ones that enable reliable pressure control
2Productivity
If pressure control valves are used to generate required pressure, then shift elements can be engaged, but pressure fluctuations affect the lock bodies causing adjustment difficulties
Solution Approach 1:
The flow guide device serves as a mediator between the pressure control valve and the poppet valve lock bodies. It stabilizes the flow characteristics and reduces pressure fluctuations before the fluid reaches the lock bodies, thereby maintaining fast shift element engagement while improving pressure adjustment precision
Solution Approach 2:
The flow guide device provides beforehand cushioning by pre-shaping the fluid flow and reducing pressure fluctuations before they reach the poppet valve. This preventive measure cushions the lock bodies against pressure variations, ensuring stable operation during rapid shift element engagement
3Speed
If flow resistance is reduced to increase dynamic control performance, then valve response improves, but pressure fluctuations have more unrestricted effect on lock bodies
Solution Approach 1:
The flow guide device acts as an intermediary that allows high flow velocity (fast response) while simultaneously stabilizing pressure fluctuations. It guides the fluid flow in a controlled manner, maintaining the speed benefits of low flow resistance while protecting the lock bodies from destabilizing pressure variations
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 valve device achieves low leakage and improved dynamic control by minimizing the impact of pressure fluctuations, maintaining shift quality even at low control pressures and large inflow pressure dips, and ensuring consistent fluid flow characteristics.
Implementation Method 1
a flow guide device which is positioned upstream between the first and the second outflow area of the second poppet valve, which is designed in a way that it provides the fluid, which flows in the direction of the second poppet valve, with a swirl
Implementation Method 2
the closure body of the second poppet valve has a cone angle of 60°+/−10°
Data Source
AI summary
A valve device having at least one inflow area and first and second outflow areas, which are connected with one another with regard to the flow through two poppet valves. Through the first poppet valve, a fluid inflow from the inflow area to the first and second outflow areas can be adjusted and a fluid outflow, through the second poppet valve between the first and the second outflow areas can be adjusted. The second poppet valve is designed as a cone poppet valve with a cone shaped closure body. Located upstream of the second poppet valve, between the first and the second outflow area, is a flow guide device which is designed to provide the fluid, which flows in the direction of the second poppet valve, with a swirl. The closure body of the second poppet valve has a cone angle of 60°+/−10°.