Gear pump and its uses

Details Gear pump and its uses Gear pump and its uses

1993-10-25

1996-08-27

Freay, Charles

Rotary expansible chamber devices

Methods

418 83, 418141, 418179, 4182066, 384565, F01C 1900

Patent

active

055494625

ABSTRACT:
A gear pump comprises rotors disposed in roller bearings. For the delivery of very viscous polymer meltings, bearings surfaces of at least one of inner races, outer races of the bearings and bearing surfaces of roller elements are made of a steel with a high-temperature stability. Bearing takes place on material pairings consisting of one of S6-5-2 high-speed steel and silicon nitride Si.sub.3 N.sub.4. The roller bearings are either unlubricated or lubricated by a lubricant remaining in the bearing, preferably a solid-substance lubrication. A distance of supported shafts, from a gearwheel face to a supporting area of the shafts, determined by the outer contact point in the roller bearing, is smaller than twice the median diameter of the shafts therealong.

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