Modern cars have become so complex, and automatic transmissions are so reliable that the automatic transmission performs the most popular, or even the base version korobkm gear on many models. Over 85% modern cars are equipped with different brands of automatic transmissions. All that is required from the driver – is start the engine, select and operate the gas and brake. Maybe it's not so fun, how to change gears manually, but it is much more effective if you carry heavy loads or pulling a trailer. At the same time, there is a lot of garages that serve them, so that the repair of automatic transmissions in St.

Petersburg, for example, is not a problem. Automatic transmission involves possible engine and includes the transfer, depending on various input data (frequency of rotation the crankshaft speed, throttle position, etc.) to support effective application of torque. Actions normally performed by clutch and manual transmission are performed automatically, using a torque converter, which allows small, controlled slippage between the engine and transmission car. Small hydraulic valves control the inclusion of different gear ratios on the driver's commands (throttle position), or the terms 'hard-wired' response to the current condition of the engine and speed. How does the automatic transmission. Automatic transmission transmits the torque and engine power to the drive wheels in a narrow range of engine speed. Automatic transmission allows the engine to rotate at sufficient speed to generate enough power and torque when the vehicle travels at very slow speeds.

A high speed car automatic transmission keeps the engine rotation reasonable values for it. Automatic transmission fluid is used as the medium for transmission of torque wheels. This gear oil also sends commands to the hydraulic control circuit and acts as a lubricant. Because the transmission fluid performs all three functions, the problems in the box machine can easily spread from one unit to another, making it difficult to repair automatic transmissions. Automatic transmission works on the principle that fluid can not be compressed, and that any body placed in a moving fluid also begins to move under its influence. To realize this law fluids, imagine two ventilyatoroa placed opposite each other. If the first fan is turned on, it begins to rotate the fan blades standing naprotiv.Etot principle is used in the fluid coupling and torque converter with the help of master and slave rotors instead of fans. Each automatic transmission consists of two sections. The front part is a fluid coupling or torque converter and provides an analog clutch, activated by the driver. The rear section avtomaticheskok box contains a block valves and planetary sleeve with hydraulic control, which take the place of a manual transmission. The system locks the brake pedal. For security purposes, a number of cars automatic transmission will not allow the driver to move Automatic transmission lever position 'Drive' or have a car until he presses the brake pedal. This system is usually controlled by the cable from the brake pedal to the automatic transmission or a computer and sensor box machine. On some vehicles You can hear when you click – the sound of the sensor. Very often, this feature protects and repairs of automatic transmissions.