Double-helical gear rotary positive displacement pump
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United States of America Patent
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Oct 11, 2016
Grant Date -
Jul 31, 2014
app pub date -
Jul 19, 2012
filing date -
Jul 19, 2011
priority date (Note) -
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Abstract
The invention relates to a double-helical gear rotary positive displacement pump including a pump housing rotatably supporting at least a driving shaft and at least a driven shaft, at least a first toothing and a second toothing being associated to the driving shaft and at least a third toothing and a fourth toothing being associated to the driven shaft. The toothings have individually a helical profile that allows their mutual herringbone meshing. Three of toothings are rigidly connected to their respective shafts. The fourth toothing, or other suitable one, is idle on the shaft and axially constrained.
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