Screw rotor and method of generating tooth profile therefor

Details Screw rotor and method of generating tooth profile therefor Screw rotor and method of generating tooth profile therefor

1996-04-03

1997-12-16

Freay, Charles G.

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

418 1, 418150, 29888023, F01C 116

Patent

active

056977727

ABSTRACT:
The transverse tooth profile of a screw rotor which meshes with a companion screw rotor is defined by a tooth root circular arc, an outer circumferential circular arc, and two curves interconnecting the tooth root circular arc and the outer circumferential circular arc. One of the curves is defined by a trochoid curve generated by a point on an outer circumferential surface of the companion screw rotor. Alternatively, the curve may comprise two curve segments, and one of the two curve segments comprising a tooth tip arc which is defined as an arc having a radius of curvature equal to or smaller than the difference between a radius of curvature of the outer circumferential circular arc and a radius of a pitch circle of the tooth profile, and the other of the two curve segments comprising a curve connected to the tooth root circular arc and determined by a curve generated by the tooth tip arc of the companion screw rotor. The other curve is defined by determining a curve which defines an imaginary rack and thereafter producing a tooth profile curve generated by the imaginary rack.

REFERENCES:
patent: 2511878 (1950-06-01), Rathman
patent: 2931308 (1960-04-01), Luthi
patent: 4543048 (1985-09-01), Densch

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