What is a hydraulic radial piston motor?

A hydraulic motor is part of a hydraulic drive system that uses pressurized fluid to move a cylinder and make a machine function. An electric motor, combustion engine, or some other type of generator, pressurizes hydraulic fluid through a series of valves and pipes to control the system. This fluid physically pushes either a hydraulic cylinder or motor and drives the machinery. The motor itself is the actuator that converts the fluid's pressure into torque and rotation.

Gears can be added to a hydraulic motor to change the level of torque administered to a specific operation. For example, a military vehicle that needs to travel over many different types of land will have different gears to control the amount of pressure used to push the motor. Pavement will need less hydraulic power to move the vehicle, while dirt or mud may need more.

Different types of plungers or pistons can be used in the motor. The most common type is an axial plunger. The pistons for the motor are designed to be parallel to allow for continuously adjustable sweeps to make the hydraulic motor operate more efficiently. The speed of the hydraulic motor ranges from 1200 to 1800 rpm. In order to increase the speed of the motor, radial pistons can be used. These pistons make short sweeps in the engine, allowing for increased speed. However, the maximum level of torque decreases as an effect of these short sweeps.

In a hydrostatic drive, consisting of a multi-cylinder radial piston pump and of a hydraulic motor, the starting behavior of the hydraulic motor is to be improved. The radial piston pump is designed in such a manner that at least one delivery cylinder (2A) is uncoupled from the hydraulic circuit. As a result of the pressure pulsation thus arising, the hydraulic motor is pulled out of its static friction, and the starting takes place already at a small pressure excess.