Product Introduction

A hydraulic coupling is a mechanical device that transfers rotational speed using a liquid medium. Its active input shaft end is connected to the original drive, and its passive output shaft end is connected to the load shaft end. By adjusting the pressure of the liquid medium, the speed of the output shaft can be altered. Ideally, when the pressure approaches infinity, the output speed equals the input speed, equivalent to a rigid coupling. As pressure decreases, the output speed accordingly diminishes. Continuously changing the medium pressure allows for a stepless adjustment of the output speed below the input speed. The power control and speed regulation principle, as well as the efficiency, of a hydraulic coupling are based on the aforementioned characteristics. A hydraulic coupling is a type of mechanical speed regulation device that consumes energy; the deeper the regulation (the lower the speed), the greater the loss. Particularly for constant torque loads, as the input power of the original transmission remains unchanged, the power loss increases proportionally with the speed loss. For loads such as fans and pumps, since the load torque varies with the square of the speed, the input power of the original transmission decreases at a rate proportional to the square of the speed, resulting in relatively lower power loss. However, the output power decreases at a cubic rate with speed, and the speed regulation efficiency is still very low. The speed regulation efficiency curve of a hydraulic coupling has an average efficiency of around 50%. A non-rigid coupling that operates with a liquid as the working medium, also known as a hydraulic coupling.

Product Real Photos

Product Features

The pump wheel and turbine of a hydraulic coupler form a sealed working chamber that allows for circulating fluid flow. The pump wheel is mounted on the input shaft, while the turbine is mounted on the output shaft. As the power source (such as an internal combustion engine or electric motor) rotates the input shaft, the fluid is ejected by the centrifugal pump wheel. This high-speed fluid enters the turbine, causing it to rotate and transferring the energy obtained from the pump wheel to the output shaft. The fluid then returns to the pump wheel, creating a continuous cycle. The hydraulic coupler transmits torque by changing the momentum moment through the interaction of the fluid with the blades of the pump wheel and turbine. Its output torque is equal to the input torque minus the frictional torque, thus its output torque is always less than the input torque. The input and output shafts of the hydraulic coupler are connected by the fluid, with no rigid connections between the working components. The characteristics of the hydraulic coupler include: it can eliminate shocks and vibrations; the output speed is lower than the input speed, and the speed difference between the two shafts increases with the load; it has good overload protection and starting performance; when the load is too high and the rotation stops, the input shaft can still rotate, preventing damage to the power source; as the load decreases, the output shaft speed increases until it approaches the input shaft speed. The transmission efficiency of the hydraulic coupler is equal to the ratio of the output shaft speed multiplied by the output torque (output power) to the input shaft speed multiplied by the input torque (input power). Generally, a hydraulic coupler can achieve higher efficiency when the normal operating speed ratio is above 0.95. The characteristics of the hydraulic coupler vary due to the different shapes of the working chamber and the pump wheel and turbine. If the oil in the hydraulic coupler is drained, the coupler is disengaged, acting as a clutch.