Gear pumps are suited for multiple pump arrangements, in which
the drive shaft of pump 1 is extended to drive a second or third
pump. The shafts are connected by drivers in between. The indi-
vidual pump stages are sealed to each other, i.e. the suction ports
are separated from each other.
Fig. 87
5.1.4 Outer gear motors non-reversible
Fig. 88: Gear motor
In their design gear motors are quite similar to gear pumps. The
only difference is the slightly different axial pressure field. The
pressure fluid flowing into the gear motor works on the gears. It
generates a torque, which is then transferred by the output shaft.
External gear motors for one sense of rotation are of asymmetrical
design, i.e. high and low pressure sides are predetermined.
Reversing operation is not possible. The arising leak oil is internally
fed to the outlet. The pressure load in the outlet is limited because
of the radial seal.
Multiple gear pumps
Hydraulic system – Basic principles
BW 900-50
103
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