![]() The most common type of hydraulic motor available is the axial piston type. All of these variations produce higher torque with less friction loss.Īll hydraulic piston motors are available in fixed and variable volume versions. There are several variations of the gear motor, including the gerotor, differential gear motor, and roller-gerotor. ![]() Close tolerances between the gears and the housing help to control fluid leakage and increase volumetric efficiency. The fluid exits at low pressure at the opposite side of the motor. It forces the gears to rotate, and follows the path of least resistance around the periphery of the housing. Pressurized fluid enters the housing at a point where the gears mesh. One gear is connected to an output shaft and the other to an idler. Both gears have the same tooth form and are driven by the pressurized fluid. External gear motors consist of a pair of matched gears enclosed in one housing. ![]() They have a high tolerance for contamination of the hydraulic oil which is a consideration for applications in dirty environments. Gear motors are compact and provide continuous service at rated power levels with moderate efficiency. There are three types of hydraulic motors: gear, piston, and vane. Hydraulic motor driving a gearbox for Bremerhaven rolling gate, Germany. This is the system used at the Bremerhaven Fishery port lock chamber for driving the rolling gates.įig. Hydraulic motors can also be the input for a gearbox as shown in the photo in Fig. In rolling gate applications, hydraulic motors often are the driving force for a mechanical winch ( Fig. This is the case for many sector gates in the United States and multiple rolling gate applications in Europe. 11.23 shows the hydraulic motor driving the pinion gear for the LPV 149 sector gate in New Orleans. 3.151b and 11.23) in particular pinion gears. In gate drive applications, hydraulic motors are often combined with mechanical drives ( Figs. Hydraulic motors can provide extremely high torques. Hydraulic motors often are required to operate at relatively low speed and high pressure and can experience wide variations in temperature and speed in normal operation. Most hydraulic motors must operate under reversible rotation and braking conditions. Hydraulic motors can be used for direct drive applications, where sufficient torque capacity is available, or through gear reductions. Pressurized fluid from the hydraulic pump turns the motor output shaft by pushing on the gears, pistons, or vanes of the hydraulic motor. Hydraulic motors convert fluid pressure into rotary motion.
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