Hydraulic Oil Supply Layout for Fast Check Valve Closure
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Solution Overview
Problem
In hydraulic supply devices, there is a need to quickly operate check valves to close oil passages when an electric oil pump is stopped, to prevent backflow of oil.
Innovation Solution
The hydraulic supply device includes a first oil pump, a second oil pump driven together with or in place of the first oil pump, and check valves in oil passages to manage the flow. When the second oil pump is stopped, auxiliary pressure from a third oil passage, fed by the first oil pump, is used to quickly operate the check valves and close the oil passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If check valves are used to close oil passages when the electric oil pump is stopped, then backflow of oil is prevented, but the closing speed of the check valve is insufficient
Solution Approach 1:
The patent introduces a third oil passage as an intermediary channel that supplies auxiliary pressure from the first oil pump to the check valve. This auxiliary pressure acts as a mediator to accelerate the closing action of the check valve, enabling it to close quickly when the electric oil pump stops, thus resolving the contradiction between reliable backflow prevention and fast closing speed.
2Loss of time
If the electric oil pump is stopped quickly, then system response time is improved, but oil backflow occurs due to slow check valve operation
Solution Approach 1:
The patent applies preliminary anti-action by providing auxiliary pressure through the third oil passage before the backflow can occur. When the electric oil pump stops, the auxiliary pressure from the first oil pump is already acting on the check valve to ensure rapid closing, preventing the harmful backflow effect before it can manifest.
3Speed
If check valve operation is accelerated, then backflow prevention is improved, but additional pressure control mechanisms are required
Solution Approach 1:
The system uses the first oil pump's own output to provide auxiliary pressure through the third oil passage, enabling the check valve to close quickly without requiring an external pressure source or complex control mechanism. The first oil pump serves itself by utilizing its discharged oil to assist the check valve operation.
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 enables the hydraulic supply device to quickly close oil passages when the electric oil pump is stopped, effectively preventing backflow and ensuring efficient operation.
Implementation Method 1
The oil supplied from the first oil pump and flowing into the third oil passage is used as an auxiliary pressure for operation of the second check valve when the second oil passage is closed.
Implementation Method 2
A check valve is provided in each of oil passages on a suction side and a discharge side of the electric oil pump. When the electric oil pump is stopped, the hydraulic supply device closes the oil passage by the check valve to prevent backflow of oil from the mechanical oil pump.
Data Source
AI summary
A hydraulic supply device includes: a first oil pump configured to supply oil to a supply passage; a second oil pump driven together with the first oil pump or driven when the first oil pump is stopped; a first check valve provided in a first oil passage that allows a suction side of the second oil pump to communicate with an oil source, and configured to close the first oil passage when the second oil pump is stopped; a second check valve provided in a second oil passage that allows a discharge side of the second oil pump to communicate with the supply passage, and configured to close the second oil passage when the second oil pump is stopped; and a third oil passage into which the oil supplied to the supply passage flows, wherein the oil flowing into the third oil passage is used as an auxiliary pressure for operation of the second check valve when the second oil passage is closed.