Clutch Valve Differential Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Proportional pressure regulating valves used in clutches face challenges in achieving fast and safe switching off due to high pressure loss from the working port to the tank port, requiring large and expensive actuator devices to overcome low spring forces, leading to start-up jumps during vehicle release, which is unsafe for mobile working devices.
Innovation Solution
A valve design where the differential pressure between the utility port and the tank port acts on the valve piston through a control device to achieve a fully open port position with an enlarged opening cross-section, allowing for increased valve piston stroke without start-up jumps, using a control duct and a disc-shaped stop element pressurized by a compression spring to control the valve's movement beyond the actuating magnet's range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large actuating magnets with large working strokes are used to open the valve fully, then the opening cross-section is maximized for fast clutch release, but the device complexity and cost increase significantly
Solution Approach 1:
A control duct is introduced as an intermediary element that channels differential pressure to act on a control surface of the valve piston. This mediator amplifies the effect of small pressure differences to achieve large valve opening without requiring large actuating magnets
Solution Approach 2:
The invention utilizes hydraulic principles by channeling differential pressure from the fluid flow itself through a control duct to act on the valve piston. The pressure differential naturally generated during fluid flow from utility port to tank port is harnessed to control valve opening, eliminating the need for large mechanical actuators
2Device complexity
If smaller actuating magnets are used to reduce cost, then the device complexity decreases, but the valve stroke must be shortened which reduces the opening cross-section
Solution Approach 1:
The invention changes the control parameter from direct magnetic force to differential pressure acting on a control surface. By utilizing the pressure differential that naturally arises during fluid flow, the system achieves large valve opening with small actuating magnets, as the pressure parameter amplifies the control effect
3Productivity
If the valve piston stroke is increased to achieve larger opening cross-section, then the clutch release speed improves, but start-up jumps occur during vehicle release compromising safety
Solution Approach 1:
The control duct acts as an intermediary that decouples the direct relationship between actuating magnet stroke and valve opening. By channeling differential pressure to a control surface, the system achieves progressive valve opening that avoids sudden jumps while maintaining large opening cross-section
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 rapid and safe clutch disengagement with minimal actuation force, using inexpensive actuating magnets and maintaining a low-loss flow, ensuring smooth engagement without start-up jumps and allowing larger fluid amounts to be supplied to hydraulic systems.
Implementation Method 1
the differential pressure that arises during the flow through the further fluid-carrying connection between the utility port and the tank port acts on the valve piston by a control device
Implementation Method 2
a disc-shaped stop element pressurized by a compression spring to control the valve's movement beyond the actuating magnet's range
Implementation Method 3
controllable by an actuator device (14) in the form of an actuating magnet
Data Source
AI summary
A valve has a valve piston (12) guided longitudinally movably in a valve housing (10) and actuated by an operation device (14). In one valve piston position, a connection is produced between a pressure supply port (P) and a working port (A). In another valve piston position, a further fluid-conducting connection is produced between the working port (A) and a tank port (T). The pressure difference arising between the working port (A) and the tank port (T) as flow passes through the further fluid-conducting connection acts, by an actuation device (30), on the valve piston (12). The valve piston passes from a stop position (32), with the further fluid-conducting connection shut off, into a fully open opening position with an enlarged opening cross section from working port (A) to tank port (T).