20
Voith
Turbo H + L
Hydraulic GmbH & Co. KG
25000057510-TED-ENX-04
5 Voith internal gear pumps
This section contains a description of the components and functionality of internal
gear pumps.
5.1 Design and functionality
Fig. 5.1.1: Components of internal gear pump with sickle principle
When the gears rotate in the pump the pressure fluid (as a rule hydraulic oil) is drawn
into the cavity between the pinion and internal gear. The two smoothly running gears
help to ensure excellent intake behavior.
In the radial direction, the gear chambers are sealed by gear meshing and/or the filler
piece. In the axial direction, the axial plates seal the pressure chamber with the minimal
possible gap. This design minimizes volume losses and increases efficiency. When the
gears rotate, the pinion teeth enter the gaps between the internal gear teeth and
displace the pressure fluid.
Individual pumps suck via the radial suction port on the pump housing. With two-flow
and multi-flow pumps, suction is generally possible via the suction port on the interim
housing. For low-noise operation of the pumps, the low pump flow and pressure pulsa-
tion usually help.
1 7 6 5 9 2 5 6 7 10 8 2 1 9 4a 4b 3
Internal gear pumps
Design and functionality
