Product Introduction

A hydraulic coupler is a mechanical device that transmits rotational speed using a liquid medium. Its driven input shaft is connected to the original driving mechanism, while the driven output shaft is connected to the load shaft. By adjusting the pressure of the liquid medium, the rotational speed of the output shaft can be changed. In an ideal state, as the pressure approaches infinity, the output speed equals the input speed, similar to a rigid coupling. As the pressure decreases, the output speed correspondingly reduces. Continuously changing the medium pressure allows for a stepless adjustment of the output speed below the input speed. The principle of power control and speed regulation, as well as the efficiency of the hydraulic coupler, are based on its aforementioned characteristics. A hydraulic coupler is an energy-consuming mechanical speed regulation device; the deeper the speed regulation (the lower the speed), the greater the loss, especially for constant torque loads. Since the original driving input power remains constant, the loss power increases proportionally with the speed loss. For loads like fans and pumps, where the load torque varies with the square of the speed, the original driving input power decreases with the square of the speed, resulting in relatively smaller loss power. However, the output power decreases with the cube of the speed, and the speed regulation efficiency remains low. The speed regulation efficiency curve of the hydraulic coupler shows an average efficiency of around 50%. A non-rigid coupling that uses a liquid as the working medium, also known as a hydraulic coupling.

Product Actual Photos

Product Features

The pump wheel and turbine of a hydraulic coupling form a sealed working chamber that allows for the circulating flow of liquid. The pump wheel is mounted on the input shaft, while the turbine is mounted on the output shaft. As the power unit (internal combustion engine, electric motor, etc.) drives the input shaft to rotate, the liquid is ejected by the centrifugal pump wheel. This high-speed liquid, upon entering the turbine, drives it to rotate, transferring the energy obtained from the pump wheel to the output shaft. The liquid then returns to the pump wheel, creating a continuous cycle. The hydraulic coupling transmits torque by changing the momentum moment through the interaction of the liquid with the blades of the pump wheel and turbine. Its output torque is equal to the input torque minus the friction torque, thus its output torque is always less than the input torque. The input and output shafts of the hydraulic coupling are connected by the liquid, with no rigid connections between the working components. The characteristics of the hydraulic coupling include: the ability to eliminate shock and vibration; the output speed is lower than the input speed, and the speed difference between the two shafts increases with the load; good overload protection and starting performance, allowing the input shaft to continue rotating even when the load is too great and the rotation stops, preventing damage to the power unit; and when the load decreases, the speed of the output shaft increases until it approaches the speed of the input shaft. The transmission efficiency of the hydraulic coupling is equal to the ratio of the product of the output shaft speed and output torque (output power) to the product of the input shaft speed and input torque (input power). Generally, a hydraulic coupling can achieve higher efficiency when the speed ratio under normal operating conditions is above 0.95. The characteristics of the hydraulic coupling vary due to the different shapes of the working chamber and the pump wheel and turbine. If the oil in the hydraulic coupling is drained, the coupling is disengaged, serving as a clutch.