Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1993-02-25
1993-12-28
Vrablik, John J.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
384516, 384615, F04C 1816, F04C 2900, F16C 1918
Patent
active
052734137
ABSTRACT:
A screw compressor assembly, comprising a housing, a pair of rotors rotatably journaled in said housing, a bearing system supporting the rotors including a radial cylindrical roller bearing and thrust bearing means rotatably supporting the journals in the housing including a first angular contact thrust ball bearing having a predetermined contact angle in the range of between about 30.degree. and 35.degree., and a second back-up angular contact bearing having a contact angle less than said contact angle of said first thrust bearing and in the range of between about 15.degree. and 20.degree., the difference between the contact angles of the thrust bearing and backup bearing being at least between about 10.degree. and 20.degree. whereby the internal force due to centrifugal force is small and therefore the induced axial force in the bearing system is minimized.
REFERENCES:
patent: 2733967 (1956-02-01), Jones, Jr.
patent: 4227755 (1980-10-01), Lundberg
patent: 4730995 (1988-03-01), Dewhirst
patent: 5009583 (1991-04-01), Carlsson et al.
SKF USA Inc., Pumpac The MRC Bearing System M213-720, Oct. 1989.
MRC Bearing Services a division of SKF USA Inc., PumpaProgram, M200-100, Oct. 1989.
Renz Jr. Eugene E.
SKF USA Inc.
Vrablik John J.
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