Hydraulic Pump

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Hydraulic Pump
Hydraulic Pump Hydraulic Pump

Hydraulic Motor and Its Types

Hydraulic motor is a motor that converts the kinetic or potential energy of a fluid into mechanical energy. It is a mechanical actuator that converts hydraulic pressure and flow into torque and angular displacement.

It can rotate in reverse direction and act as a pump when powered by a mechanical source. Although a hydraulic motor can be interchangeable with a hydraulic pump sometimes, most often, hydraulic pumps cannot be used as hydraulic motors because they cannot be backdriven. The hydraulic drive system can be formed by hydraulic pumps, motors, and cylinders.

There are many hydraulic motor types which are the most important operating specification to consider when searching for hydraulic motors. The first one is the gear and vane motors. They can be used in simple rotating systems. 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. It uses a vane to generate mechanical energy. Pressurized fluid strikes the blades in the vane, causing it to rotate and produce output torque. While a gear motor consists of two gears, i.e. the driven gear and the idler gear. The second type is the axial piston motor which is generally used for high quality rotating drive systems. It uses an axially-mounted piston to generate mechanical energy. High pressure flow into the motor forces the piston to move in the chamber, generating output torque. The third one is the radial piston motors which are available in Crankshaft type and the Multilobe cam ring type. This motor uses pistons mounted radially about a central axis to generate energy.

Addition to the above mentioned elements, there are still many aspects to consider when searching for hydraulic motors. It includes the operating torque, operating pressure, operating temperature, operating speed, and the maximum fluid viscosity, etc. As to the operating torque, it depends directly on the pressure of the working fluid delivered to the motor. And the operating pressure is the pressure of the working fluid that is pressurized by an outside source delivered to the hydraulic motor. The operating temperature is the fluid temperature range the motor can accommodate. The operating speed is the speed at which the hydraulic motors' moving parts rotate.

Undoubtedly, hydraulic motors can be widely used in many applications such as winches and crane drives, roll mills, self-driven cranes, and excavators and so on. Therefore, it is rather necessary to take all the above mentioned aspects into consideration when you choose the hydraulic motors.

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How does an auto transmission's hydraulic pump work?

I am converting an SUV to electric motor powered. When the transmission needs to shift I can cut the power to the motor, "disengaging" it from the transmission. Additionally, the motor doesn't idle, so I have no way to keep hydraulic pressure in the transmission at a standstill. I want to remove the torque converter and power the hydraulic pump externally. Is this possible, or can I use an external pump?

The way an automobile engine with a automatic transmission works is essentially a hydrostatic hydraulic system. If you have for example, a 200 hp engine the engines output is connected to the automatic's transmission hydraulic pump. So that pump is actually consuming all the energy of that engine and the hydraulic flow is directed to the torque converter and gears to give motive power.

You could bypass the transmissions built in hydraulic pump, but it is difficult and a waste of a good pump. A better solution might be to keep the excellent efficient pump that is built into the transmission and come up with a diverter of the hydraulic flow so that when you don't need the flow it just loops around in a flow circuit.

This is similar to a power steering pump which doesn't consume power when it is on, but the moment you turn the wheel a hydraulic valve is opened and the hydraulic fluid is allowed to flow into a cylinder and turn the car wheels in the direction you point to

So if you can get a diagram of your SUV's automatic transmissions hydraulic circuitry, you can buy a hydraulic valve in between the hydraulic pump and the torque convertor. So when you don't want the transmission to add to the drag, just divert the flow away from the converter and loop it back to the pump.