Pressure-Regulating Check Valve for Stable Hydraulic Mode Switching
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Solution Overview
Problem
Hydraulic pressure supply systems face abrupt changes when switching between full and half discharge modes, leading to increased system size and component count due to the need for additional components like accumulators to mitigate these changes.
Innovation Solution
A hydraulic control apparatus with an oil pump assembly, pressure regulating check valve, and directional control valve that regulates hydraulic pressure by using a spool valve and elastic portions to manage flow between discharge ports, limiting abrupt pressure changes without increasing system size or component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure regulating valve is provided in each oil passage to regulate hydraulic pressure, then abrupt pressure changes can be limited, but the number of components and system size increase
Solution Approach 1:
The patent combines the pressure regulating function with the check valve function into a single integrated component. The pressure regulating check valve integrates the valve body, spring mechanism, and check function into one unit, eliminating the need for separate pressure regulating valves in each oil passage while maintaining pressure stability during mode switching between full and half discharge operations
2Reliability
If an accumulator is provided to curb abrupt pressure change, then pressure stability is improved, but the system size and number of components increase
Solution Approach 1:
The pressure regulating check valve integrates pressure regulation functionality directly into the existing valve structure, eliminating the need for separate accumulators. The spring mechanism within the valve body provides the necessary pressure buffering and regulation, achieving pressure stability without adding external accumulator components that would increase system volume
3Productivity
If the flow rate of discharged oil is abruptly increased when switching from half discharge mode to full discharge mode, then productivity is improved, but pressure stability deteriorates
Solution Approach 1:
The pressure regulating check valve dynamically adjusts the flow characteristics during mode transitions. The spring mechanism provides progressive resistance that moderates the abrupt flow rate increase when switching from half to full discharge mode, allowing productivity improvement while maintaining pressure stability through dynamic flow regulation rather than abrupt 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
The apparatus effectively limits abrupt hydraulic pressure changes to control targets while maintaining a compact design, improving responsiveness and reducing pressure loss, thus addressing the challenges of system size and complexity.
Implementation Method 1
a first elastic portion that is housed in the interior of the spool hole between the valve body and the bottom in the predetermined direction, extends in the predetermined direction, and applies an elastic force toward the other side in the predetermined direction to the valve body
Implementation Method 2
a second elastic portion that is housed in the interior of the spool hole between the valve body and the bottom in the predetermined direction and extends in the predetermined direction... The second elastic portion applies an elastic force toward the second side in the predetermined direction to the valve body
Data Source
AI summary
A hydraulic control apparatus includes an output-side oil passage into which oil from a first oil passage and oil from a second oil passage flow, and a pressure regulating check valve regulating a hydraulic pressure in the second oil passage. The pressure regulating check valve includes first and second elastic portions housed in a spool hole between a valve body and a bottom of the spool hole. A natural length of the second elastic portion is shorter than a distance between the valve body and the bottom when the valve body closes an inflow hole. The second elastic portion applies an elastic force to the valve body in a state in which the valve body opens the inflow hole.