Hydraulic Control Device Spool Valve Pressure Threshold Switching
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Solution Overview
Problem
Existing oil pressure supply systems that switch between all discharge and half discharge modes using solenoid valves are costly and have size restrictions, leading to increased manufacturing costs and larger system sizes.
Innovation Solution
A hydraulic control device with an oil pump, multiple discharge ports, and valve devices in oil passages that automatically switch between all discharge and half discharge states based on oil pressure thresholds, eliminating the need for solenoid valves by using spool valves and elastic members to control oil flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solenoid valve is used to switch between all discharge mode and half discharge mode, then the switching function is achieved, but the manufacturing cost increases and the system size becomes larger
Solution Approach 1:
The patent replaces the solenoid valve (electromagnetic actuation) with a spool valve system actuated by elastic members and differential oil pressure (mechanical/hydraulic actuation). This substitution eliminates the need for electromagnetic coils and associated control electronics, thereby reducing manufacturing cost and system size while maintaining the switching function between all discharge and half discharge modes
Solution Approach 2:
The spool valve system is designed to automatically switch between modes based on differential oil pressure without requiring external electromagnetic control signals. The elastic members and oil pressure differential self-regulate the valve position, eliminating the need for solenoid actuators and reducing both cost and complexity
2Ease of operation
If a solenoid valve is used to switch between all discharge mode and half discharge mode, then the switching function is achieved, but the arrangement flexibility is restricted
Solution Approach 1:
By replacing the solenoid valve with a compact spool valve system that uses elastic members and differential pressure for actuation, the patent achieves greater arrangement flexibility. The mechanical actuation system requires less space and can be more easily integrated into various system configurations compared to electromagnetic solenoid valves
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 solution allows for efficient switching between all discharge and half discharge states, reducing manufacturing costs and system size while stabilizing oil pressure supplied to controlled objects, minimizing sudden changes in oil flow and pressure.
Implementation Method 1
a first valve device provided in the first connection oil passage... is brought into an open state in which oil in the first connection oil passage is allowed to flow from the second output side oil passage to the first output side oil passage when a first value obtained by subtracting a value of a first output oil pressure from a value of a second output oil pressure is equal to or larger than a first threshold value
Implementation Method 2
a second valve device provided in the second connection oil passage... is brought into an open state in which the oil in the second connection oil passage is allowed to flow from the second output side oil passage to the input side oil passage when an oil pressure in the third connection oil passage is equal to or larger than a second threshold value
Data Source
AI summary
In a hydraulic control device, a first valve device is brought into an open state when a first value obtained by subtracting a value of a pressure in the first output side oil passage from a value of a pressure in the second output side oil passage is equal to or larger than a first threshold value. A second valve device is brought into an open state when an oil pressure in a third connection oil passage is equal to or larger than a second threshold value, and is brought into a closed state when the oil pressure in the third connection oil passage is smaller than the second threshold value. The first value is equal to or larger than the first threshold value and the first valve device is in the open state when the second valve device is in the closed state.