Spring-Loaded 4/4 Valve for Power-Off Hydraulic Shut-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic systems for open-loop control in motor vehicle transmissions require energy to achieve a safe hydraulic shut-off condition, reducing energy efficiency.
Innovation Solution
A spring-loaded 4/4 directional valve with four switching conditions, including a hydraulic shut-off condition that can be maintained without power feed, allowing for fluidic connections and disconnections between ports based on piston position, enabling energy-efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If energy is supplied to achieve hydraulic shut-off condition, then safe condition of actuator is established, but energy efficiency of hydraulic system deteriorates
Solution Approach 1:
The valve is designed to assume the safe shut-off condition automatically when no energy is supplied, inverting the conventional approach where energy is required to achieve shut-off. The spring force naturally pushes the valve slide to block fluid flow paths when the actuator is not actively controlled, providing inherent safety without continuous power consumption.
Solution Approach 2:
The valve utilizes the spring mechanism to automatically establish the safe shut-off condition without requiring external energy input. The system serves itself by using the spring's stored mechanical energy to maintain the default blocked state, eliminating the need for continuous electrical or hydraulic power to ensure safety.
2Use of energy by moving object
If spring-loaded valve with four switching conditions is used, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The valve slide is designed to provide four distinct switching conditions through its position in the valve body, allowing a single component to perform multiple functions. The same valve structure can connect or disconnect different fluid paths (first and second controlled outlets with third and fourth outlets) depending on the slide position, reducing the need for multiple separate valves or complex control mechanisms.
Solution Approach 2:
The valve body is segmented into distinct regions (first, second, third, and fourth outlets) that can be independently connected or disconnected through the valve slide's movement. This segmentation allows for precise control of fluid paths while maintaining a relatively simple overall valve structure that can achieve multiple switching states.
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 allows for energy-efficient hydraulic system operation and improved actuation of motor vehicle transmission components by eliminating the need for mechanical detents and reducing pressure peaks during direction changes, enhancing the hydraulic open-loop control.
Implementation Method 1
The valve includes a piston (VK), which can be displaceably guided in a housing (VG). A first end (VK1) of the piston (VK) can be acted upon by a force, which acts counter to a force, with which a spring (F) acts onto a second end (VK2) of the piston (VK).
Data Source
AI summary
A valve (V, V1, V2) includes a housing (VG) and a piston (VK) displaceably guided therein. A first end (VK1) of the piston (VK) can be acted upon by a force, with the aid of which the piston (VK) is displaceable against a spring (F) acting upon a second end (VK2) of the piston (VK). The valve (V, V1, V2) has four switching conditions, in which four ports (A, B, P, T) in the housing (VG) are selectively connectable to one another or blocked with respect to one another. In a first switching condition, none of the ports (A, B, P, T) are connected to one another. The spring (F) is configured in such that, in the absence of an application of force onto the first end (VK1), the piston (VK) is held in a position, which corresponds to the first switching condition of the valve (V, V1, V2).