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Hydraulic Motors

Hydraulic Motors

Hydraulic Motors convert hydraulic power (hydraulic fluid flow) to mechanical rotation force. Their rotation speed can be steplessly adjusted by controlling the supply flow, while their supply torque depends on the difference between the motor inlet and outlet pressures. The motors are available in gear, vane and piston types. Piston motors with variable displacement also available.

Gear Motors

They come in two types:

1-External Type: This motor is simple, compact, lightweight, inexpensive and capable of relatively high speed rotation. It has a cross-sectional structure similar to that of gear pump and requires a drain to be installed for oil seal protection.


2-Internal Type: This motor is compact and relatively not expensive and operates with high torque at low speed. It consist of an internal trochoid gear motor and differential speed reducer.



Gerotor Vs Geroler

The difference is shown in the picture below: Essentially a Geroler’ has rolls added to the lobes of the outer ring of the Orbit gear set. These rolls act as a roller bearing and reduce friction, increase mechanical efficiency and reduce wear in systems with low fluid viscosity. In addition, the Geroler type typically provides smoother performance at low speed conditions.


We Supply and Service all kinds of hydraulic Gear Motors. We use, supply and recommend Brevini and Hydreco hydraulic motors.




Vane Motors

1-Low-Speed High-Torque Vane Motor: This motor has relatively large capacity and operates with a high torque at low speed.


2-Medium-Speed Vane Motor: This motor has a structure similar to that of pressure balanced vane pump, the capacity of wich is relatavely small. It is provided with a vane lift mechanism (spring) to insure that contact between the vane and the cam ring is always maintained.


We Supply and Service all kinds of hydraulic Vane Motors. For more information please call us on 03 9460 2377

Piston Motors

Piston Motors are available in axial and radial types. Also available are fixed and variable displacement axial piston motors that operate at high, medium or low speed with a bent axis or swash plate.

1-Bent Axis Fixed Displacement Piston Motor: This motor has the same structural principles as the Bent Axis Fixed Displacement Piston Pump. Variable displacement type is also available. The motor can have a bent-axis angle of up to 40 degrees and is generally suitable for high speed operation.


2-Swash Plate Piston Motor: The high speed type of this motor is based on a structure similar to that of fixed displacement swash plate pump. The motor can provide good low speed performance at the time of the motor start.




3-Eccentric Radial Piston Motor: This motor is widely known as star shaped motor. It has several fixed cylinders perpendicularly on the output shaft in radial pattern. The flow is fed or discharged to/from the cylinders through a distributor valve connected to the shaft with a swivel joint. When a hydraulic pressure is applied to the piston, it reciprocates and pushes the eccentric cam on the shaft to produce torque. This motor is designed for low speed high torque applications.


4-Multi Stroke Radial Piston Motor: This motor has a piston placed in the direction of the radius of the shaft with a cam roller. The piston moves on the patterned cam ring to produce torque. Thi motor can offer a larger displacement capacity than that of any other hydraulic motors. It is often used in winches and crushing machines.




We Supply and Service all kinds of hydraulic Piston Motors. We use, supply and recommend Brevini and Hydreco hydraulic motors.