Oil Pump Check Valve Timing to Prevent Restart Discharge Delay
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Solution Overview
Problem
Air enters the oil passage connecting the electric oil pump and the oil reservoir, leading to delays in oil discharge and reduced responsiveness of the electric oil pump when it is restarted.
Innovation Solution
An oil pressure supply device with first and second check valves in the oil passages to prevent air ingress and ensure timely oil discharge, featuring a flapper valve mechanism that closes the passages when the oil pump is stopped, with the second check valve closing earlier than the first to minimize backflow and air entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electric oil pump is stopped, then energy consumption is reduced, but air enters the oil passage causing delayed oil discharge when restarted
Solution Approach 1:
The check valve closes the oil passage before air can enter when the pump stops, preventing the harmful effect of air ingress in advance. This ensures that when the pump restarts, no air is present to cause discharge delays, thus resolving the contradiction between energy savings from stopping and maintaining quick response capability.
2Use of energy by moving object
If the electric oil pump is stopped, then energy consumption is reduced, but responsiveness deteriorates upon restart
Solution Approach 1:
By closing the oil passage with the check valve before air entry occurs, the system prevents air accumulation that would otherwise slow down pump restart response. This maintains high responsiveness while allowing the pump to stop for energy conservation.
3Speed
If check valves are added to prevent air entry, then responsiveness improves, but device complexity increases
Solution Approach 1:
The check valve automatically opens and closes based on pressure differential without external control, using the system's own operating conditions to prevent air entry. This simple passive mechanism improves responsiveness while adding minimal structural complexity.
4Reliability
If the second check valve closes earlier than the first, then air entry is prevented more effectively, but manufacturing precision requirements increase
Solution Approach 1:
The second check valve is positioned and designed to close at a different stage than the first, creating a staged sealing effect. This local differentiation in closing timing ensures reliable air prevention while using simple structural means rather than requiring high-precision synchronous control.
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 air entry and backflow, enhancing the responsiveness of the electric oil pump by ensuring prompt oil discharge and reducing the risk of discharge delays and component wear.
Implementation Method 1
a first check valve provided in the first oil passage and configured to close the first oil passage and prevent oil from moving to the oil source side when the oil pump is stopped
Implementation Method 2
a second check valve provided in the second oil passage and configured to close the second oil passage and prevent oil from moving to the oil pump side when the oil pump is stopped. When the oil pump is stopped, the second check valve closes the second oil passage earlier than the first check valve closes the first oil passage.
Data Source
AI summary
An oil pressure supply device supplies, to an oil chamber, an oil pressure generated by suctioning oil from an oil source with an oil pump. The oil pressure supply device includes a first oil passage connected to a suction side of the oil pump; a first check valve provided in the first oil passage and configured to close the first oil passage and prevent oil from moving to the oil source side when the oil pump is stopped; a second oil passage connected to a discharge side of the oil pump; and a second check valve provided in the second oil passage and configured to close the second oil passage and prevent oil from moving to the oil pump side when the oil pump is stopped. When the oil pump is stopped, the second check valve closes the second oil passage earlier than the first check valve closes the first oil passage.