Orbital Motors

Hydraulic orbital motor is a motor that slow-rotating rotor drives the output through the flat key or splined shaft. The inner gear ring is fixedly connected with the housing, and the oil entering from the oil port pushes the rotor to revolve around a center point. ATO provides 50 to 395 cc/rev displacement hydraulic orbital motors for you to choose from, the maximum speed from 180 rpm to 859 rpm, working torque up to 525 Nm, working pressure 15MPa, high efficiency and economical price. Hydraulic orbit motors have a wide range of applications, mainly used in the slewing mechanism of a variety of machinery such as agriculture, fishery, light industry, lifting and transportation, mining, and construction machinery.

The structure of the hydraulic orbital motor

Hydraulic orbital motor for the end of the flow distribution, excitation compensation type, mainly by the output shaft, front cover, bearings, long linkage shaft, bearing shell, stator and rotor vice, valve disc, small linkage shaft, flow distribution disc and preload spring and other components, this hydraulic motor has a low speed, high torque characteristics.

Hydraulic motor performance decline in the cause

Hydraulic motor wear phenomenon

The hydraulic motor installed on the drilling rig was dismantled and inspected, and it was found that the friction surface of the hydraulic motor and the valve disc was severely worn, and the deepest wear reached 0.15 mm, the oil seal of the output shaft was leaking.

Output shaft oil seal leakage causes

After dismantling and testing, the axial and radial clearance of the output shaft is in line with the standard, and the mating surface of the output shaft and oil seal has no obvious wear. However, it was found that the rubber of the oil seal was aging and hardening, and the elasticity was deteriorating. After the oil seal lip is worn, the preload force and oil sealing performance decreases, and the high oil temperature accelerates the wear of the oil seal lip. In addition, due to the internal leakage of the hydraulic motor, the back pressure inside the housing is too high, which further aggravates the oil seal lip wear and oil leakage.

The reason for the wear of the flow plate

As can be seen from the hydraulic motor working principle, the distribution disk and the cycloid rotor by a small linkage shaft coupling together, while the distribution disk in the valve plate to do sliding rotation. The causes of excessive wear of the frictional side are as follows:

Just install the new hydraulic motor, due to the motor housing is not filled with hydraulic oil, so that the friction surface of the friction side lack of sufficient lubrication and cause wear. Especially at the beginning of the work with a large load, more intensified with the wear of the flow disc with the valve disc friction surface due to wear roughness, so that the friction between the impurity storage space increased, into the friction surface of the particles and the metal particles were ground down with the flow disc rotation, intensified the wear. The failure of the filter element of the hydraulic system makes the hydraulic oil mixed with particulate impurities, small particles in the process of rotating the flow disc into the friction surface, so that the friction surface abrasive wear. Due to the wear between the flow disc and valve disc, the hydraulic oil in the inlet and return oil channel between the gap and connected, under the action of high pressure, so that the hydraulic oil sealing, cleaning, heat dissipation performance decreases, the oil temperature increases, plus according to the wear.