Transmission Flush

Fluid coupling is a device for transmitting rotation between shafts by means of the acceleration and deceleration of a hydraulic fluid such as oil.

Generally, it consists of an impeller on the input or driving shaft and a runner on the output or driven shaft. The two contain the fluid. Impeller and runner are bladed rotors, the impeller acting as a pump and the runner reacting as a turbine. The driving turbine is rotated by the prime mover, which is typically an internal combustion engine or electric motor. The impellor’s motion passes both outwards linear and rotational motion to the fluid. The fluid in the coupling can be varied to control the machine startup behavior and the amount of power transmitted during the startup of the machine.

There are many special features about the fluid coupling like delay chambers, dynamic refill, and centrifugal valves, etc. As to the delay chambers, they are usually used to provide greater relief of the drive motor during run-up. Another important characteristic of the fluid coupling is the stall speed. It is defined as the highest speed at which the pump can turn when the output turbine is locked and maximum input power is applied.

Fluid couplings have a wide range of applications. They can be used in mining, power generation, automotive, material handling, mobile equipment, the rail transportation, aviation, marine, and other transportation-related applications. For example, in automotive applications, typically, the pump is connected to the flywheel of the engine and thus is turned by the engine’s crankshaft. The turbine is connected to the input shaft of the transmission. While the transmission is in gear, as engine speed increases torque is transferred from the engine to the input shaft by the motion of the fluid, propelling the vehicle.

There are two types of devices according to the fill, i.e. fluid couplings with constant fill and fill-controlled turbo couplings. The latter is used to provide a controlled start or used when application requirements include adaptation of machine speed, and starting and stopping the driven machine with the drive motor running. As to the fill-controlled turbo couplings, it is rather important to take the fluid into consideration because it affects the fluid coupling’s transmission behavior. As a result, the fluid must in line with the coupling components.

It is obvious that the fluid couplings are available in many places. They are indispensable in many industries. It is necessary for customers to pay attention to this product.

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