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Hydraulic gear motors are often used in mobile hydraulics and in agricultural machinery to drive conveyer belts, dispersion plates, screw conveyors or fans.
There are two different types of hydraulic gear motors. The gear motor, which is very similar in design to the external gear pump, is a high speed motor. The gerotor gear motor, also known as an epicyclic or gear ring motor, is a slow speed motor.
Gear motors and axial piston motors are high speed motors. If your operation requires a lower speed, you can reduce the output speed of the shaft by using gears. The operating pressure of gear motors is usually quite low: between 100 and 150 bar. Modern gear motors, however, are capable of operating at continuous pressures of up to 250 bar.
Key features of gear motors:
A major drawback of gear motors is that they produce a large amount of noise. Gear motors with only one direction of rotation are designed exactly the same as external gear pumps. A gear motor that can change directions of rotation has a drain case port and the axial pressure fields are different. The efficiency of gear motors is relatively low due to oil leakage.
Typical parameters are:
Unlike gear motors, the gerotor (also called epicyclic, gear ring motor, or orbit motor) has very low oil leakage. The motor can produce large torques at very slow speeds (approximately 5 rpm).
Key features of gerotor motors are:
Just like gear ring pumps, the rotor of the gerotor motor has one tooth less than the stator. Because of the difference in teeth, enclosed chambers are formed within the orbit motor.
Gerotor motors are available in two types: one has a central shaft and the other has a cardan shaft. Orbit motors with central shafts are widely used in hydraulic systems.
The orbit motor with a cardan shaft consists of cylindrical rolls in the set of gear wheels. It is only used for special applications (e.g. high pressures, very high efficiency and longer lifespan).
Typical parameters:
