Engine Oil Pump Plunge Pool Mitigates Surge Noise
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Solution Overview
Problem
Engine oil pumps generate surging noise due to rapid pressure changes during oil discharge, which is difficult to mitigate without optimizing the length of the discharge incline in accordance with pump specifications.
Innovation Solution
The engine oil pump incorporates a plunge pool with a vortex-generating design in the oil pocket, reducing pressure changes by consuming energy through vortex flux, thus minimizing surging noise without requiring optimization of the discharge incline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a discharge incline is used to prevent rapid pressure change, then surging noise is reduced, but the device complexity increases and requires continuous optimization of the inclined surface length according to pump specifications
Solution Approach 1:
The invention changes the geometric parameters of the oil pocket, specifically creating a cross-section that expands in the rotation direction of the rotors. This parameter change allows the oil pocket to gradually increase in volume as oil accumulates, preventing sudden pressure changes and surging noise without requiring a complex discharge incline structure
Solution Approach 2:
Instead of using a discharge incline to gradually reduce pressure after the sealing-forming surface, the invention inverts the approach by designing the oil pocket cross-section to expand in the rotation direction. This creates a natural pressure equalization effect that eliminates the need for the discharge incline optimization
2Productivity
If the cross-section of oil pocket is suddenly reduced by sealing-forming surface, then oil is efficiently discharged, but rapid pressure increase occurs causing surging noise
Solution Approach 1:
The invention segments the oil pocket cross-sectional area along the rotation direction, creating zones of different cross-sectional areas. The cross-section is divided into a first area (smaller) and a second area (larger), with the second area being greater than the first. This segmentation allows gradual pressure buildup while maintaining discharge efficiency
Solution Approach 2:
The expanding cross-section design acts as a beforehand cushioning mechanism. As oil accumulates in the oil pocket during rotation, the increasing cross-sectional area provides a cushioning effect that prevents sudden pressure spikes before the oil reaches the discharge portion, thereby eliminating surging noise
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 design significantly reduces surging noise by maintaining low oil pressure in the pocket, eliminating the need for discharge incline optimization and achieving a noise reduction of about 10 dB or more.
Implementation Method 1
a plunge pool with a vortex-generating design in the oil pocket, reducing pressure changes by consuming energy through vortex flux
Data Source
AI summary
An engine oil pump, may include a plunge pool formed in a pump case and preventing a rapid change in pressure of oil when the oil may be discharged through an oil discharge portion that may be a cross-section expansion section by generating vortex flux when oil, which may be pumped into an oil pocket by rotation of an inner rotor and an outer rotor, temporarily collects before being discharged after passing a cross-sectional reduction section, and reducing the pressure by consuming the energy of the oil increasing in pressure by the vortex flux.