Oil Pump Relief Valve Assembly With Separated Bypass Timing
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Solution Overview
Problem
The existing relief valve assemblies for oil pumps in vehicles experience low oil pressure during high-speed engine operation due to overlapping or continuous bypass sections, leading to insufficient oil discharge and degradation in durability and fuel efficiency.
Innovation Solution
A relief valve assembly with a separated bypass section, where the first and second bypass passages are staggered by a predetermined interval, allowing the plunger to block and open corresponding inlet and outlet passages sequentially to maintain a stable pressure and flow rate, preventing the overlap of bypass sections and ensuring sufficient oil discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first bypass section overlaps the second bypass section or the second bypass proceeds immediately after the first bypass, then the pressure relief function is improved, but the oil pressure decreases due to insufficient oil discharge
Solution Approach 1:
The patent implements periodic action by separating the bypass operation into distinct phases: a first bypass period followed by a second bypass period, with each period having specific duration and sequence. This periodic control prevents continuous bypass that would cause low oil pressure, while still achieving effective pressure relief during designated phases.
Solution Approach 2:
The patent applies preliminary action by controlling the plunger to perform the first bypass operation before the second bypass operation. This sequential arrangement ensures that oil pressure is regulated in a controlled manner, with the first bypass preparing the system state for the second bypass, preventing premature or simultaneous bypass that would reduce oil pressure.
2Stress or pressure
If the bypass passages are opened continuously to relieve pressure, then the pressure control is improved, but the flow rate decreases due to excessive bypass
Solution Approach 1:
The patent uses periodic action to alternate between pressure relief phases (bypass open) and flow maintenance phases (bypass closed). The control unit opens bypass passages only during specific time periods when pressure relief is needed, and closes them during other periods to maintain flow rate, preventing continuous bypass that would reduce productivity.
Solution Approach 2:
The patent implements dynamics by making the bypass passage configuration changeable over time through plunger movement. The system dynamically adjusts the bypass state based on operating conditions, transitioning between different bypass configurations (first bypass, second bypass, or closed) to balance pressure control and flow rate requirements.
3Speed
If the plunger moves rapidly to open bypass passages, then the response time is improved, but the oil pressure stability decreases
Solution Approach 1:
The patent applies periodic action by controlling the plunger movement to occur in scheduled phases rather than continuously or rapidly. The first bypass period and second bypass period are separated by controlled intervals, allowing the system to respond to pressure conditions in a measured, periodic manner that maintains stability while still providing timely pressure relief.
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 configuration prevents low oil pressure during high-speed engine operation, maintaining a stable flow rate and pressure, thus enhancing durability and fuel efficiency by ensuring a sufficient oil supply and reducing the impact of external variations like temperature and viscosity changes.
Implementation Method 1
a plunger (22) slidably installed in a valve housing (21) and configured to be elastically supported in a direction of blocking a flow of the oil
Data Source
AI summary
A method of operating a relief valve assembly for an oil pump includes unblocking a first bypass inlet passage and blocking a first bypass outlet passage, a second bypass inlet passage, and a second bypass outlet passage with a plunger, introducing oil to the relief valve assembly, moving the plunger in a downward direction by a first displacement to unblock the first bypass outlet passage, starting a first bypass of the oil, moving the plunger in the downward direction by a second displacement to block the first bypass inlet passage and unblock the second bypass inlet passage, terminating the first bypass of the oil, moving the plunger in the downward direction by a third displacement to unblock the second bypass outlet passage, and starting a second bypass of the oil.