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Hydraulic » Hydraulic Component / Hydraulic Fitting » Hydraulic Motor




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Hydraulic Motor

Hydraulic MotorA hydraulic motor transforms hydraulic energy into rotary mechanical energy applied to a resisting object by means of a shaft connected with the motor. They closely resemble hydraulic pumps in construction and size. The difference being, instead of pushing the fluid as the pump does, in a hydraulic motor the rotating elements (i.e. vanes, gears, pistons, etc.) are pushed by the oil pressure to enable the motor shaft to rotate and thus develop the necessary turning torque and continuous rotating motion.


Types of Motors:
Hydraulic motors are classified as:
1.Uni-directional, or
2.Bi-directional.

As per their construction, hydraulic motors are of:
1.Gear type
This is generally a fixed capacity imbalanced motor. The hydraulic imbalance in a gear motor is caused by gear teeth unmeshing. Meaning all teeth subjected to system pressure are hydraulically balanced except for one side of one tooth on one gear. This is the point where the torque is developed. The larger the gear tooth or higher the pressure, more is the torque produced.

2.Vane type
This is a positive displacement motor that develops an output torque at its shaft by allowing hydraulic pressure to act in the vanes that are extended. The vane motor includes: vanes, rotor, cam-ring, shaft and port plates. In vane motors the imbalance is caused by the difference in vane area exposed to hydraulic energy which is due to the eccentric position of the rotor to the housing. When pressure oil enters the inlet port, the unequal area of the vanes results in development of a torque in the motor shaft. The larger the exposed area of the vane, or higher the pressure, more is the torque that is developed. This makes the shaft rotate.

3. Piston type
In general three types of piston motors exist. These include: These are positive displacement motors that can develop an output torque at the shaft by allowing oil pressure to act on the pistons. The piston type motors include: in-line piston, axial piston and radial piston. The axial piston motors are used for medium to high pressure and moderately high power ranges whereas, radial piston motors are used for very high pressure ranges.



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