PAIR OF CO-OPERATING SCREW ROTORS
First Claim
1. A pair of co-operating screw rotors, comprising:
- a male rotor having helically extending lobes and intermediate grooves; and
a female rotor having;
helically extending lobes and intermediate grooves which are configured to intermesh with the helically extending lobes and intermediate grooves of said male rotor;
a pitch radius (RFP) defining a pitch circle (CFP), each groove of the female rotor having a first flank comprising at least three concave sections, and a first section comprises the radially innermost point of said groove, a second section is shaped as a circular arc with a radius (R2) having its center located outside the pitch circle, and a third section is shaped as a circular arc with a radius (R3) having its center located outside the pitch circle, said radius (R3) of the third section being greater than said radius (R2) of the second section which is greater than the radial distance (R) between the pitch circle and said radially innermost point of said groove.
1 Assignment
0 Petitions
Accused Products
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.
7 Citations
20 Claims
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1. A pair of co-operating screw rotors, comprising:
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a male rotor having helically extending lobes and intermediate grooves; and a female rotor having; helically extending lobes and intermediate grooves which are configured to intermesh with the helically extending lobes and intermediate grooves of said male rotor; a pitch radius (RFP) defining a pitch circle (CFP), each groove of the female rotor having a first flank comprising at least three concave sections, and a first section comprises the radially innermost point of said groove, a second section is shaped as a circular arc with a radius (R2) having its center located outside the pitch circle, and a third section is shaped as a circular arc with a radius (R3) having its center located outside the pitch circle, said radius (R3) of the third section being greater than said radius (R2) of the second section which is greater than the radial distance (R) between the pitch circle and said radially innermost point of said groove. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20)
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12. The pair of co-operating screw rotors according to, wherein each lobe of the male rotor has a first lobe flank comprising a substantially convex section which is generated at least partly by said second and third sections of said female rotor.
Specification