Hydraulics Motor

HYDRAULIC MOTOR

WHAT IS HYDRAULIC MOTOR ? A Hydraulic motor is a mechanical actuator that converts hydraulic pressure and flow into torque and angular displacement (rotation). The hydraulic motor is the rotary counterpart of the hydraulic cylinder.

The following types of hydraulic motors are available: Gear Motor Vane Motor

Axial Plunger Motors Radial Piston Motors

A GEAR MOTOR A gear motor consists of two gears, the driven gear (attached to the output shaft by way of a key, etc) and the idler gear. High pressure oil is ported into one side of the gears, where it flows around the periphery of the gears, between the gear tips and the wall housings in which it resides, to the outlet port. The gears then mesh, not allowing the oil from the outlet side to flow back to the inlet side.

VANE MOTOR A vane motor consists of a housing with an eccentric bore, in which runs a rotor with vanes in it that slide in and out. The force differential created by the unbalanced force of the pressurized fluid on the vanes causes the rotor to spin in one direction.

AXIAL PLUNGER MOTORS For high quality rotating drive systems plunger motors are generally used. Whereas the speed of hydraulic pumps ranges from 1200 to 1800 rpm, the machinery to be driven by the motor often requires a much lower speed. This means that when an axial plunger motor (swept volume maximum 2 litres) is used, a gearbox is usually needed. For a continuously adjustable swept volume, axial piston motors are used.

RADIAL PISTON MOTORS Crankshaft type with a single cam and pistons pushing inwards. This type of motor is basically an old design but is one which has extremely high starting torque characteristics. They are available in displacements from 40cc/rev up to about 12 litres/rev but can sometimes be limited in power output. Crankshaft type Radial Piston Motors are capable of running at "creep" speeds and some can run seamlessly up to 1500 rpm whilst offering virtually constant output Torque chacteristics. This makes them still the most versatile design.

BRAKING Hydraulic motors usually have a drain connection for the internal leakage, which means that when the power unit is de-energised the hydraulic motor in the drive system will move if an external load is acting on it, such as a crane or winch with suspended load. In these cases there is always a need for a brake or a locking device.

ADVANTAGES Hydraulic motors are often tough and durable. If used properly they can be more energy efficient than other types of motors. They also often provide a strong, steady torque even at low rotational speeds.

Disadvantages Hydraulic motors often need to be precisely machined to work well, which can drive up the cost. Some also cannot rotate as fast as electric motors.

USES Hydraulic motors are used for many applications now such as winches and crane drives, wheel motors for military vehicles, self-driven cranes, and excavators. Conveyor and feeder drives, mixer and agitator drives, roll mills, drum drives for digesters, trommels and kilns, shredders for cars, tyres, cable and general garbage, drilling rigs and trench cutters.

DIFFERENTIATE BETWEEN HYD. PUMP AND HYD. MOTOR HYD. PUMP HYD. MOTOR IT COVERTS MECHANICAL ENERGY IN FLUID ENERGY IT CONVERTS FLUID ENERGY INTO MECHANICAL ENERGY TO PRODUCE TORORY MOTION AND TORQUE TO SUPPLY HIGH PRESSURE OF OIL

HYD. PUMP HYD. MOTOR GEAR PUMP, VANE PUMP, SCREW PUMP, PISTON PUMP GEAR MOTOR, VANE MOTOR, PISTON MOTOR ETC. EFFICIENCY IS MORE AS COMPARED TO MOTOR LESS AS COMPARED TO PUMP USE- CRANES, MACHINE TOOLS, EARTH MOVING EQUIPMENTS, FARM MACHINERIES. USE-WINDING, CONVERS, FEED DRIVES OF M/C TOOLS.

Questions?