Hydraulic Control Valve for Transmission Self-Locking Relief
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Solution Overview
Problem
Existing automatic vehicle transmissions using friction plate type brakes or clutches are prone to self-locking due to simultaneous engagement, leading to safety accidents, and the addition of pressure sensors and series solenoid valves increases cost and space without being widely adopted in domestic transmissions.
Innovation Solution
A hydraulic control valve with a slidable valve cartridge and pressing mechanism that senses hydraulic pressures from two oil supply circuits, automatically relieving pressure through an oil discharge port when the total pressure exceeds a threshold, eliminating the need for pressure sensors and series solenoid valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors and series solenoid valves are added to prevent transmission self-locking, then safety is improved, but cost and occupied space increase
Solution Approach 1:
The patent merges the pressure sensing function and pressure relief function into a single hydraulic control valve. The valve body integrates a valve hole that receives both the slidable valve cartridge and pressing mechanism, combining multiple functions (pressure sensing, pressure comparison, and pressure relief) that were previously distributed across separate components (pressure sensors and solenoid valves).
Solution Approach 2:
The hydraulic control valve uses the hydraulic pressure itself to activate the pressure relief function. When the total hydraulic pressure exceeds the threshold, the slidable valve cartridge automatically slides to open the communication between the first oil supply port and oil discharge port, eliminating the need for external sensors and control systems to detect and respond to pressure conditions.
2Reliability
If pressure sensors and series solenoid valves are used to detect and relieve pressure, then transmission self-locking is prevented, but the transmission total cost increases
Solution Approach 1:
The patent extracts the pressure sensing and control functions from external electronic components (pressure sensors and solenoid valves) and relocates them into a purely hydraulic mechanism within the valve body. This eliminates the need for expensive electronic sensing and control systems while maintaining the pressure relief functionality.
Solution Approach 2:
The patent replaces expensive electronic components (pressure sensors and solenoid valves) with a simple, mechanically actuated hydraulic valve that uses basic hydraulic principles. The valve cartridge and pressing mechanism are simple mechanical components that can be manufactured at low cost using conventional hydraulic valve manufacturing processes.
3Speed
If a hydraulic control valve with slidable valve cartridge is used, then pressure relief response speed is improved, but valve structure complexity increases
Solution Approach 1:
The patent replaces electronic sensing and control systems with a purely mechanical/hydraulic system. The slidable valve cartridge responds directly to hydraulic pressure forces without requiring electronic signal processing, actuators, or control algorithms, achieving extremely fast response times typical of direct-acting hydraulic valves.
Solution Approach 2:
The patent uses hydraulic pressure itself as the actuating force for the valve cartridge. The first and second oil supply ports deliver hydraulic pressure that directly pushes the slidable valve cartridge to slide and open the pressure relief path, eliminating the need for external actuators and achieving instantaneous response to pressure changes.
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
Prevents transmission self-locking by efficiently managing hydraulic pressures, reducing costs and space, while ensuring reliable operation and fast response without additional components.
Implementation Method 1
When a total hydraulic pressure from a first oil supply circuit and a second oil supply circuit is higher than a predetermined value, the slidable valve cartridge can move towards the pressing mechanism with the total hydraulic pressure
Implementation Method 2
a pressing mechanism (131, 132) disposed at another end of the valve hole (111)... a pressing force from the pressing mechanism (131, 132)
Data Source
AI summary
Provided are a hydraulic control valve, a hydraulic control system, and a transmission. The hydraulic control valve includes a valve body, a slidable valve cartridge, and a pressing mechanism. A valve hole, a first oil supply port, a second oil supply port, and an oil discharge port are formed at the valve body, and each of the first oil supply port, the second oil supply port, and the oil discharge port is in communication with the valve hole. Both the slidable valve cartridge and the pressing mechanism are accommodated within the valve hole. The slidable valve cartridge has a small end close to an end of the valve hole and a large end abutting against the pressing mechanism. The pressing mechanism is disposed at another end of the valve hole.