Rotary expansible chamber devices – With mechanical sealing – Axially movable end wall or end wall portion
Patent
1989-05-10
1990-11-20
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
Axially movable end wall or end wall portion
F04C 218, F04C 1500
Patent
active
049715348
ABSTRACT:
A gear pump comprises two gears arranged in engagement with one another, a sealing plate arranged at one side of the gears and insignificantly movable relative to the latter, two pressure fields including a low pressure field and a high pressure field, and forming a narrowing at the side of the high pressure field such that pressure difference at the narrowing act on the sealing plate so as to lift the sealing plate from side surfaces of the gears starting from a predetermined number of revolutions of the gears which is determined by the narrowing.
REFERENCES:
patent: 2990341 (1963-07-01), Oliver
patent: 2996999 (1961-08-01), Trautman
patent: 3476055 (1969-11-01), Crowther
patent: 4344745 (1982-08-01), Herrmann
patent: 4678341 (1987-07-01), Stuckey
Cananaugh David L.
Robert & Bosch GmbH
Striker Michael J.
Vrablik John J.
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