Hydraulic Control Device Pressure Reduction Valve
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Solution Overview
Problem
Existing hydraulic control devices for motor vehicle transmissions and clutches are not optimally designed for pressure reduction, leading to inefficiencies and increased complexity and costs, particularly in dual clutch transmissions.
Innovation Solution
The design incorporates at least two hydraulic subsystems with a pressure reduction valve that acts as a mechanical or hydraulic switch, using a stepped piston and cylinder to control pressure release from a pressure accumulator when subsystem pressures fall below a minimum, allowing for efficient pressure reduction without sudden pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure accumulator is used to store pressure for hydraulic actuators, then the system can maintain pressure during pump stop, but the pressure cannot be released immediately when the pump stops
Solution Approach 1:
A pressure reduction valve is introduced as an intermediary component between the pressure accumulator and the hydraulic subsystems. This valve acts as a controlled release mechanism that can hold pressure when closed and release pressure when opened, mediating between the accumulator's pressure storage function and the system's pressure reduction requirement
Solution Approach 2:
The pressure reduction valve is designed to automatically respond to pressure conditions in the hydraulic subsystems. When pressure falls below a minimum threshold, the valve automatically opens to release pressure from the accumulator, and when pressure is sufficient, it automatically closes to maintain pressure, enabling self-regulating pressure management
2Adaptability or versatility
If separate pressure control mechanisms are provided for each hydraulic subsystem, then each subsystem can be independently controlled, but the device complexity increases
Solution Approach 1:
The pressure reduction valve is designed with multiple functions: it monitors pressure from the pressure accumulator, compares it with minimum pressure requirements from multiple hydraulic subsystems, and controls pressure release to all subsystems simultaneously. This single multi-functional component replaces what would otherwise require multiple separate control mechanisms
Solution Approach 2:
The invention combines the pressure control functions for multiple hydraulic subsystems into a single integrated pressure reduction valve. Instead of having separate control valves for each subsystem, the pressure reduction valve consolidates all pressure management functions into one component, reducing overall system complexity
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 solution reduces pressure in the accumulator efficiently, adapts well to dual clutch transmissions, and minimizes complexity and costs by ensuring pressure is released only when necessary, maintaining low oil exchange and preventing system leakage.
Implementation Method 1
a pressure accumulator (18) being provided, with the pressure stored in the pressure accumulator (18) being degradable via the pressure reduction valve (20, 21)
Implementation Method 2
The pressure from the subsystem acts via the subsystem pressure channel on ring surfaces of different sizes on the stepped piston. When pressure is applied from these subsystems, the difference in the annular surfaces causes a force on the stepped piston and thus a displacement of the stepped piston
Implementation Method 3
The stepped piston is preloaded with a spring. The stepped piston is pressed on one of its end faces by a spring into a position in which a connection or orifice is opened from the main pressure channel in the direction of the tank
Data Source
Figure 1
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AI summary
The hydraulic control device (1) has an actuator (2), a pressure accumulator (18) and a pressure reduction valve (20), where the pressure stored in the pressure accumulator is degradable by the pressure reduction valve. Two hydraulic sub-systems (22,23) are provided, where each sub-system has one actuator. The pressure reduction valve is coupled in flow connection with each of the sub-systems. The pressure stored in the pressure accumulator is degradable by the pressure reduction valve, when the sub-systems are provided below a minimum pressure.