Orbital hydraulic motors are widely used in modern mechanical engineering. It is characterized by its ability to deliver high torque and smooth operation, making it suitable for a wide range of applications requiring low-speed, high-torque drives. It is worth noting that Orbital hydraulic motors are usually equipped with three oil hoses, a design that has a scientific basis and a practical purpose behind it.
The three oil lines of an Orbital hydraulic motor are the inlet, return and drain ports. Generally speaking, there are two main oil pipes in a hydraulic motor: the inlet pipe and the return pipe. The inlet pipe is responsible for sending high-pressure oil into the motor to make it move; the return pipe sends the used-up low-pressure oil back to the tank, forming a closed-loop cycle. This is the most basic hydraulic motor piping configuration. Hydraulic oil enters the motor through the inlet port and drives the rotor to rotate around the center point, thus driving the output shaft to rotate. During the rotation of the rotor, the oil is continuously switched from the high pressure zone to the low pressure zone through the flow distribution mechanism, and finally discharged from the motor through the return port, completing an operating cycle. This process ensures a continuous and stable torque output.
Unlike ordinary hydraulic motors, Orbital hydraulic motor has an extra oil pipe, which is the oil drain pipe, called pressure relief pipe and oil drain circuit. The oil drain pipe plays the following roles:
1. Drain internal oil leakage
Orbital hydraulic motor has a lot of rotating and sealing parts inside, no matter how precise the design is, there will always be a small amount of hydraulic oil leaking from the high-pressure chamber to the inside of the shell. If this oil is not drained out in time, the pressure inside the housing will get higher and higher, which will eventually lead to the oil seal being damaged or even burst. This is the first role of the drain tube - the excess oil safely discharged back to the tank, to avoid the motor “suffocation”.
2. Protecting the oil seal and extending the life of the motor
The output shaft of Orbital hydraulic motor is usually sealed with a skeleton oil seal to prevent the hydraulic oil from leaking out. If there is no drain tube, the internal pressure is too high, it is easy to break the oil seal, resulting in oil leakage, even affecting the normal operation of the motor. The oil drain tube can keep the internal pressure stable, reduce the working pressure of the oil seal and prolong its life.
3. Avoid back pressure
There is a certain back pressure on the return line of some hydraulic systems, if the drain pipe is directly connected to the return line, it may lead to increased pressure in the shell, affecting the work of the motor. For this reason, the drain line is usually connected separately to the return tank, which ensures a constant low pressure inside the motor.
The three oil lines of the Orbital hydraulic motor have their respective roles to ensure the efficient operation of the Orbital hydraulic motor.
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