Transmission with this car several functions: Change the gear ratio, wheel torque and speed to expand the scope of the changes to adapt to constantly changing driving conditions, while the engine in a favorable (higher power and lower fuel consumption) of the conditions of work;
The same direction of rotation of the engine case, a car can travel backward;
The use of neutral, interrupt power transmission to the engine to start, idle, and to facilitate the transmission shift or power output.
Transmission by the transmission speed and control institutions, when necessary, you can also install power output device. In the classification in two ways: by way of gear ratio changes and by the different ways to manipulate the points.
By way of sub-transmission ratio change:
There-stage transmission is the most widely used one. It uses a gear drive, with a number of value transmission ratio. According to different types of gear used, there is a fixed transmission axis (normal transmission) and the axis of the rotary transmission (planetary gear transmission) in two. Currently, cars and light, medium truck transmission gear ratios are usually three to five forward gears and one reverse gear, the heavy goods vehicles using the combined transmission, then there are more stalls. Number referring to the so-called forward transmission file number of stalls.
Non-stage transmission gear ratio of its value in a certain range can be infinite number of level changes, a common power type and hydraulic type (moving liquid) two. Type CVT transmission power transmission components for the DC series motor, in addition to the trolley bus applications, but in the ultra-heavy duty truck transmission systems are also widely used in the trend. Moving hydraulic CVT transmission components for the torque converter.
Integrated transmission system refers to the torque converter and transmission gear are level consisting of hydraulic mechanical transmission, the transmission ratio can be between the maximum and minimum values refer to within a few intermittent for stepless changes, the current used more often.
Way by manipulating points:
Force-operated transmission gear shift is directly manipulated by the driver shift.
Automatically-operated transmission shift its gear ratio is automatically selected and the so-called "automatic" refers to the mechanical transmission with each stall transformation is reflected in the engine load and speed of the signal system to control the actuator and the shift system achieved. The driver simply manipulating the accelerator pedal to control speed.
Semi-operated transmission, there are two types: one is commonly used in automatic control of several stalls, stall rest manipulated by the driver; the other is pre-style, with buttons that the driver selected gear in advance, in step the clutch pedal or release the accelerator pedal, turn on a magnetic device or hydraulic device to be shifting.
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