Pair of co-operating screw rotors
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United States of America Patent
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Oct 22, 2019
Grant Date -
Aug 10, 2017
app pub date -
Jun 26, 2014
filing date -
Jun 26, 2014
priority date (Note) -
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Abstract
A pair of co-operating screw rotors including a male rotor and a female rotor. The male rotor and the female rotor have helically extending lobes and intermediate grooves configured to intermesh with one another. Each groove of the female rotor has a first flank including at least three concave sections. A first section includes or is disposed immediately adjacent the radially innermost point of the groove. A second section is shaped as a circular arc with a radius having its center located outside the pitch circle. A third section is shaped as a circular arc with a radius having its center located outside the pitch circle. The radius of the third section is greater than the radius of the second section, which is greater than the radial distance between a pitch circle of the female rotor and the radially innermost point of the groove.
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