Gear Root Pocket Structure for Gear Pump Cavitation Reduction
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Solution Overview
Problem
Cavitation in gear pumps leads to wear and reduced efficiency, necessitating a solution to minimize or eliminate cavitation and increase the lifespan of gear pump components.
Innovation Solution
The introduction of root pockets into the gear teeth, increasing the gear root volume and adding trapped fluid compliance without altering the gear tooth profile, thereby enhancing the gear pump's cavitation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gear pump design is used, then the structure is simple and manufacturing is easy, but cavitation occurs leading to wear and reduced efficiency
Solution Approach 1:
The patent applies local quality by introducing root pockets only at specific locations (gear roots) rather than modifying the entire gear structure. This localized modification increases trapped fluid compliance where it is most needed for cavitation prevention, while maintaining simple gear tooth profiles and conventional manufacturing methods for the rest of the gear.
Solution Approach 2:
The gear structure is segmented by adding discrete root pockets between the gear teeth. These pockets create additional compliant chambers that are spatially separated from the main gear body, allowing independent volume expansion to absorb pressure fluctuations and reduce cavitation without affecting the overall gear integrity or requiring complex redesign.
2Reliability
If gear tooth profile is altered to increase volume, then cavitation resistance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts the volume increase function from the gear tooth profile itself and relocates it to separate root pockets. By taking out the compliance requirement from the critical tooth profile geometry and placing it in non-critical root pockets, the design achieves cavitation resistance without compromising tooth profile precision or increasing manufacturing complexity.
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 root pockets effectively reduce cavitation, minimizing wear and increasing the efficiency and lifespan of gear pumps by managing pressure differences and fluid dynamics within the gear mesh.
Implementation Method 1
Cavitation is the formation of vapor cavities (bubbles) inside of a liquid when the local pressure is decreased rapidly below the vapor pressure of the liquid. This pressure decrease forms a vapor bubble inside the liquid which typically lasts for a short time before collapsing back into a liquid.
Implementation Method 2
The root pockets provide increased gear root volume and add trapped fluid compliance. The compliance of the trapped fluid in the root pockets allows it to compress and expand, absorbing pressure fluctuations and preventing cavitation in the gear mesh.
Data Source
AI summary
A gear having volume expansion for cavitation reduction in a gear pump mesh. The gear has a gear tooth profile; a body; a plurality of involute gear teeth extending radially outward from the body and including first and second neighboring gear teeth each having a respective tip and a root, the first and second neighboring gear teeth defining a space between them; and a root pocket formed directly into the roots of the gear teeth and in the space between the gear teeth, providing an increased gear root volume and adding trapped fluid compliance while leaving unaltered the gear tooth profile. Also disclosed is a gear pump including the gear.