Pressure Control Valve Conical Geometry for Progressive Shifting
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Solution Overview
Problem
Existing pressure control valves in automatic transmissions lack the ability to provide a progressive pressure control curve, leading to suboptimal shifting comfort and torque transmission capabilities.
Innovation Solution
The pressure control valve features a truncated cone-shaped control element with a cone angle greater than the truncated cone angle, creating a varying effective control surface that interacts with the control pressure, allowing for sensitive clutch control and high torque transmission through a progressive pressure control curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional pressure control valve with a cylindrical control element is used, then the structure is simple and manufacturing is easy, but the pressure control curve is linear and shifting comfort is poor
Solution Approach 1:
The control element is designed with a conical geometry instead of a cylindrical shape, creating a curved surface that varies the effective control area as the valve opens. This curvature allows the pressure control curve to become progressive rather than linear, improving shifting comfort while maintaining a relatively simple single-piece construction.
2Power
If the control element is positioned precisely to control pressure, then pressure control function is achieved, but the relationship between control current and pressure is linear and torque transmission capability is limited
Solution Approach 1:
The conical geometry of the control element changes the effective control surface area as a function of valve opening position. This geometric parameter variation transforms the linear relationship between control current and pressure into a progressive non-linear relationship, enabling both sensitive low-pressure control and high-pressure capability for improved torque transmission.
3Reliability
If a truncated cone-shaped control element with cone angle greater than truncated cone angle is used, then a progressive pressure control curve is achieved improving clutch control, but the manufacturing precision requirements increase
Solution Approach 1:
The control element features a specific conical geometry where the full cone angle is greater than the truncated cone angle, creating different local surface characteristics. This local geometric differentiation produces the progressive pressure control curve that enhances clutch control sensitivity while the conical form remains manufacturable with standard precision capabilities.
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 enables sensitive control of clutches at low pressures and high control pressures, improving shifting comfort and torque transmission by altering the linear relationship between control current and pressure, resulting in a progressive pressure control curve.
Implementation Method 1
the control element has at least one, at least truncated, cone-like first control element region with a truncated cone angle and the orifice is composed of a through opening that passes through the orifice element and at its end oriented toward the control element, has at least one cone-like, in particular first orifice region with the cone angle
Implementation Method 2
The flow speed of the fluid is the greatest at the narrowest point, but then the passage region immediately widens out due to the differently embodied angles, which results in a slowing of the flow speed of the fluid in this region
Data Source
AI summary
The invention relates to a pressure control valve, composed of at least a valve component; situated between a control chamber and a return chamber, the valve component has an orifice, which a control element can close, partially close, or open, and the control element has at least one, at least truncated cone-like first control element region with a truncated cone angle and the orifice is formed by a through opening, which extends through the orifice element and at its end oriented toward the control element, has at least one cone-like, in particular first, orifice region with a cone angle; and the cone angle is greater than the truncated cone angle.