Hydraulic technology has been introduced into the industrial field for more than a hundred years, with the rapid development of industry, hydraulic technology is changing with each passing day. Hydraulic technology and our daily life also has a close relationship, the street to the car, truck, bus power steering, vibration absorber, road construction of asphalt road grinding machine roller, etc., in the construction site of excavators, dump trucks, truck cranes, concrete mixing trucks, concrete pump trucks, etc., above the use of hydraulic technology. Looking at the sea, the capstan, windlass, hatchcover, deck crane and steering gear on large and small cargo ships floating in the port are also using hydraulic technology. In the factory, various lathes, boring machines, milling machines, grinding machines, processing centers, and various presses, die casting machines, injection molding machines, extruders, hollow blow molding machines for the manufacture of various plastic products, as well as steel mill rolling machines, steel casting machines, chemical plant presses, filters, emergency cutting valves, and forklifts that travel around the factory, etc., the application of hydraulic technology is everywhere.
The application of hydraulic system in daily life is also extremely extensive, and the hydraulic system also provides a lot of convenience for people's lives. The hydraulic system is divided into independent hydraulic system and combined hydraulic system according to the number and form of the actuator driven by hydraulic pump. When the hydraulic pump only supplies oil to the actuator, the independent hydraulic system is called an independent system. Combined system, a hydraulic pump to several hydraulic actuators to supply oil, called combined system Combined system can be divided into parallel system, series system, independent system and complex system. The hydraulic system is composed of ATF oil pump, pipeline and various sliding valves, and its function is to control the clutch, brake and other work according to the speed, throttle opening and other signals, so that the automatic transmission automatically timely shift.
Hydraulic system is divided into low speed and high speed, low speed when the car load is large, throttle valve opening, low speed, throttle valve output throttle oil pressure is high, speed control valve output oil pressure is low, the left side of the shift valve is greater than the right oil pressure, that is, the oil acting on the left side of the spool is greater than the left force, the spool right shift. When the spool of the shift valve is moved right, the low-speed oil circuit is gradually connected, and the oil flows into the transmission mechanism from the working chamber, so that the low-speed clutch or brake is combined, and the automatic transmission is put into low-speed gear. When the car load is small and the speed is high, the throttle valve output throttle oil pressure is low, the speed control valve output oil pressure is high, the left side of the shift valve is lower than the right side oil pressure, and the spool moves left. In the process of shifting the spool of the shift valve to the left, the high-speed oil circuit is gradually connected, and the oil flows into the transmission mechanism from the working chamber, so that the high-grade clutch or brake is combined, and the automatic transmission is put into high-speed gear.
