The automobile transmission has several functions:
(1) Change the transmission ratio, expand the range of torque and speed of the driving wheel to adapt to the frequently changing driving conditions, and at the same time make the engine work in a favorable (higher power and lower fuel consumption) operating conditions;
(2) In the case where the direction of rotation of the engine is constant, it is the car that can drive backwards;
(3) Utilize neutral gear to interrupt power transmission so that the engine can be started and idling, and transmission shifting or power output can be facilitated.
The transmission is composed of a variable speed transmission mechanism and an operating mechanism. When required, a power output device can also be added. There are two ways to classify: according to the change of transmission ratio and the difference in the way of operation.
According to the change of transmission ratio:
Progressive transmission is currently the most widely used one. It uses a gear drive and has several fixed gear ratios. According to the different types of wheels used, there are two types of fixed-axis transmission (ordinary transmission) and axis-rotary transmission (planetary transmission). At present, the transmission ratio of a sedan and light and medium truck transmissions usually has 3-5 forward gears and one reverse gear, and there are more gears in a combined transmission for heavy goods vehicles. The so-called transmission gear refers to the number of forward gears.
The transmission ratio of the stepless transmission can be changed in infinitely many levels within a certain range of values, and there are two types of power transmission: the electric type and the hydraulic type (dynamic type). The variable-speed transmission component of the electric continuously variable transmission is a DC-series motor, which is widely used in the transmission system of a super-heavy dump truck in addition to its application on trolley buses. The driving part of the hydrostatic continuously variable transmission is a hydraulic torque converter.
An integrated transmission refers to a hydromechanical transmission consisting of a hydraulic torque converter and a gear-type stepped transmission. Its transmission ratio can be varied steplessly within a few intermittent ranges between the maximum and minimum values. More applications.
According to the operating mode to divide:
Manoeuvrable transmissions are geared directly by the driver to shift gears.
Automatic transmission transmission ratio selection and shifting are performed automatically. The so-called “automatic†means that the shift of each gear of the mechanical transmission is to control the actuator of the shifting system by means of a signal system reflecting the engine load and the vehicle speed. Realized. The driver simply manipulates the accelerator pedal to control the speed.
There are two types of semi-automatic manual transmission: one is commonly used several gears automatically operated, the rest of the gear is operated by the driver; the other is pre-selected, that is, the driver selects the gear in advance with the button, in the tread When the lower clutch pedal or the accelerator pedal is released, an electromagnetic device or hydraulic device is turned on for shifting.
(1) Change the transmission ratio, expand the range of torque and speed of the driving wheel to adapt to the frequently changing driving conditions, and at the same time make the engine work in a favorable (higher power and lower fuel consumption) operating conditions;
(2) In the case where the direction of rotation of the engine is constant, it is the car that can drive backwards;
(3) Utilize neutral gear to interrupt power transmission so that the engine can be started and idling, and transmission shifting or power output can be facilitated.
The transmission is composed of a variable speed transmission mechanism and an operating mechanism. When required, a power output device can also be added. There are two ways to classify: according to the change of transmission ratio and the difference in the way of operation.
According to the change of transmission ratio:
Progressive transmission is currently the most widely used one. It uses a gear drive and has several fixed gear ratios. According to the different types of wheels used, there are two types of fixed-axis transmission (ordinary transmission) and axis-rotary transmission (planetary transmission). At present, the transmission ratio of a sedan and light and medium truck transmissions usually has 3-5 forward gears and one reverse gear, and there are more gears in a combined transmission for heavy goods vehicles. The so-called transmission gear refers to the number of forward gears.
The transmission ratio of the stepless transmission can be changed in infinitely many levels within a certain range of values, and there are two types of power transmission: the electric type and the hydraulic type (dynamic type). The variable-speed transmission component of the electric continuously variable transmission is a DC-series motor, which is widely used in the transmission system of a super-heavy dump truck in addition to its application on trolley buses. The driving part of the hydrostatic continuously variable transmission is a hydraulic torque converter.
An integrated transmission refers to a hydromechanical transmission consisting of a hydraulic torque converter and a gear-type stepped transmission. Its transmission ratio can be varied steplessly within a few intermittent ranges between the maximum and minimum values. More applications.
According to the operating mode to divide:
Manoeuvrable transmissions are geared directly by the driver to shift gears.
Automatic transmission transmission ratio selection and shifting are performed automatically. The so-called “automatic†means that the shift of each gear of the mechanical transmission is to control the actuator of the shifting system by means of a signal system reflecting the engine load and the vehicle speed. Realized. The driver simply manipulates the accelerator pedal to control the speed.
There are two types of semi-automatic manual transmission: one is commonly used several gears automatically operated, the rest of the gear is operated by the driver; the other is pre-selected, that is, the driver selects the gear in advance with the button, in the tread When the lower clutch pedal or the accelerator pedal is released, an electromagnetic device or hydraulic device is turned on for shifting.
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