What is the principle of hydraulic retarder for heavy trucks?

[VanEmersyn]

Heavy-duty vehicles equipped with hydraulic retarders avoid severe overheating of the braking system during prolonged braking, which occurs in vehicles without such systems. Poor temperature control can even lead to tire ignition or more serious accidents due to brake-induced high temperatures, hence trucks are fitted with water spray systems. Below is relevant information about hydraulic retarders: 1. Basic Introduction: The hydraulic retarder, also known as a hydraulic deceleration device, is used when vehicles descend long slopes. Although exhaust braking can achieve good braking effects, it has limited effectiveness for large-tonnage mining dump trucks and can cause some degree of engine damage. Therefore, mining dump trucks equipped with hydromechanical transmissions are fitted with hydraulic retarders. 2. Structure: The stator of the hydraulic retarder also serves as the retarder housing, connected to the rear of the transmission or the vehicle frame. The rotor is connected to the drive shaft via a hollow shaft, with blades cast on both the rotor and stator. During operation, pressure is applied to the oil reservoir through the control valve, allowing the working fluid to fill the working chamber between the rotor and stator.