Dual Gear Pump Coupling for Stable Phase Difference and Low Pulsation
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Solution Overview
Problem
Existing dual phase difference pumps face challenges in reducing discharge pressure pulsation due to varying phase differences between gear pump units, which affects stability and assembly efficiency, and setting zero backlash leads to unexpected loads and strength issues.
Innovation Solution
A dual phase difference pump design featuring two gear pump units coupled by a coupler that maintains a constant phase difference irrespective of the coupling phase angle, using a spline coupling structure with gears meshing without backlash, ensuring equal phase difference and reducing assembly burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the teeth of the gear portion and the teeth of the spline are not relatively aligned and working is performed separately, then manufacturing complexity is reduced, but the phase difference between gear pump units varies for each product
Solution Approach 1:
The invention changes the parameter of tooth alignment by making the teeth of the gear portion and the teeth of the spline relatively aligned and working simultaneously. This parameter change ensures that the phase difference between gear pump units remains consistent across products while maintaining ease of manufacture through the unified working process.
2Object-generated harmful factors
If backlash is set to substantially zero to reduce pressure pulsation, then pressure pulsation is reduced, but unexpected loads act on the gear teeth causing strength issues
Solution Approach 1:
The invention performs preliminary action by pre-aligning the teeth of the gear portion with the teeth of the spline before operation. This preliminary alignment ensures that when backlash is set to substantially zero for pressure pulsation reduction, the loads are evenly distributed across properly positioned teeth, preventing unexpected load concentration and maintaining gear tooth strength.
3Manufacturing precision
If the meshing position between male spline and female spline is selected to stabilize phase difference, then phase difference consistency is improved, but assembly efficiency deteriorates
Solution Approach 1:
The invention implements self-service by designing the gear portion and spline with relative alignment such that the teeth automatically align during assembly without requiring manual selection of meshing positions. This self-aligning mechanism maintains phase difference consistency while eliminating the time-consuming process of selecting meshing positions, thereby improving assembly efficiency.
4Manufacturing precision
If gears mesh without backlash and teeth are relatively aligned, then phase difference is stabilized and pressure pulsation is reduced, but assembly complexity increases
Solution Approach 1:
The invention merges the alignment function and meshing function into a unified structure where the teeth of the gear portion and the teeth of the spline are both relatively aligned and work simultaneously. This merging eliminates the need for separate alignment and meshing steps, stabilizing phase difference while avoiding increased assembly complexity through process integration.
Data Source
AI summary
A dual phase difference pump 100 that can reduce the pulsation of a discharge pressure as much as possible. The dual phase difference pump 100 includes, in series, two gear pump units 1, 2 each including a pair of gears 4, 5 configured to mesh with each other. Shafts 42 of the gear pump units 1, 2 are coupled to each other by using a coupler 6. The pair of gears 4, 5 mesh with each other without backlash. The coupler 6 is configured to couple the shafts 42 to each other at any one of a plurality of predetermined phase angles, and is configured to make a phase difference between the gear pump units 1, 2 equal irrespective of which predetermined phase angle is selected among the plurality of predetermined phase angles as a phase angle at which the shafts 42 are coupled to each other.