External Gear Motors - Fayat Group BOMAG BW 900-50 Service Manual

7.6

External gear motors

Outer gear motors non-reversible
7.6 External gear motors
Fig. 8 Gear motor
In their design gear motors are quite similar to gear pumps. The only difference is the slightly different axial pres-
sure 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 pres-
sure load in the outlet is limited because of the radial seal.
76 BOMAG 008 921 86