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Technical Documents >> Technical Documents
Principle and Function of the Hydraulic Torque Converter Transmission for Sewage Suction Trucks
Release Time: 2011-11-15 9:41:20 Views: 86
The principle and function of the hydraulic torque converter transmission is to replace the traditional mechanical clutch. It is installed between the engine and the automatic transmission, capable of smoothly transferring power from the sewage suction truck's engine to the automatic transmission.
Due to the presence of the hydraulic torque converter, the automatic transmission can automatically complete all actions related to gear shifting compared to manual transmissions, freeing the driver so that they only need to focus on acceleration, deceleration, and steering – the "three elements of movement," truly simplifying driving. In comparison to manual transmissions, the hydraulic torque converter plays a role as important as the clutch.
The working method of the hydraulic torque converter is entirely different from that of the clutch. Inside the hydraulic torque converter, one side connects to the sewage suction truck's engine output shaft, which is directly linked to the pump wheel housing. On the other side of the hydraulic torque converter is a set of turbine wheels connected via an axle to the transmission system. There are no direct connecting mechanisms between the guide wheel and the turbine; both are sealed within the housing of the hydraulic torque converter, filled with viscous fluid – automotive automatic transmission fluid. When the sewage suction truck's engine runs at low speed, the entire hydraulic torque converter also rotates at a low speed. The blades on the pump wheel drive the circulation of the automotive automatic transmission fluid inside the torque converter. However, due to the low speed, the force exerted by the automatic transmission fluid on the turbine is insufficient to propel the vehicle forward, causing the vehicle to remain stationary, achieving the effect of clutch disengagement.
When the accelerator pedal is pressed, the engine RPM increases, and the pump wheel's rotational speed will increase accordingly. The flow rate of the automatic transmission fluid inside the hydraulic torque converter continues to rise, increasing the force applied to the turbine. When this force exceeds the resistance required to rotate the guide wheel, the guide wheel begins to operate, transmitting power to the transmission system and wheels, propelling the vehicle forward and ultimately achieving the goal of power transfer.
The transmission of sewage suction trucks is one of the most critical components. Due to the high operating temperature within the transmission and the precise meshing of various parts, there are high requirements for the quality and cleanliness of the transmission fluid inside the sewage suction truck's transmission. The sewage suction truck should have its transmission thoroughly cleaned every 40,000 to 50,000 km.
For the maintenance of the sewage suction truck's transmission, properly replacing the transmission fluid inside the sewage suction truck's transmission is key. The transmission fluid not only lubricates and cools but also has a primary role in transmitting torque, with a working temperature around 140°C. Most failures of sewage suction truck transmissions occur due to overheating and prolonged use without changing the transmission fluid, eventually leading to impurities.
What consequences would arise if the transmission fluid in the sewage suction truck's transmission becomes dirty? First, the sludge and carbon deposits in the dirty oil increase the wear on each friction plate and component, reducing the lifespan of each component. Second, the sludge and carbon deposits in the dirty oil cause poor oil flow through the valves and oil pipes, affecting power transmission, resulting in slow acceleration or loss of speed in the sewage suction truck's transmission. In severe cases, it can lead to no oil pressure in a particular gear, causing it to burn out. Lastly, dirty oil accelerates the aging of the sealing O-rings in each cylinder, affecting the oil pressure release in each cylinder, causing slow acceleration, loss of speed, and serious issues like friction plates slipping and burning out.
Replacing the transmission fluid in sewage suction trucks differs from changing lubricating oil. Traditional maintenance methods can replace only about half of the oil, and it cannot be thoroughly replaced, leaving nearly half of the dirty oil still in the system. Residual oil, combined with sludge and impurities, gathers in the valve body, hydraulic torque converter, and cooling lines. If not properly cleaned, it can cause internal oil line blockages in the system.
Correct maintenance of the sewage suction truck's transmission requires the use of specialized transmission maintenance equipment to completely remove old transmission fluid and other impurities, then inject new oil. If you can consistently change the oil every 40,000 to 50,000 kilometers, we welcome new and returning customers to visit our company to inspect our production capabilities and product craftsmanship. We will serve you wholeheartedly. Business QQ: 470511671 Purchase Hotline: +86 0722-3229933 Sales Department Manager Tang Bin +86 15972787777 Hubei Chengli Official Website http://www.hbdlzy.com