System classification of automotive transmission system

- Nov 01, 2016 -

Mechanical transmission system

Mechanical transmission system has simple structure, reliable operation, widely applied in various types of vehicles. Its basic structure and working principle: the engine's power clutch 1, transmission, 3, 2, universal joint drive shaft 8, 7 of the main reducer, differential 5, axis 6 to the back of the drive wheel. And in conjunction withthe engine, car driving in different conditions. In order to meet the different requirements of the car, drive system must have an increased deceleration torque, variable speed, making the car backwards, interrupt power delivery, specific role on both sides of the differential rotation of the drive wheel.

Hydraulic transmission system

Hydraulic transmission systems use hydraulic and mechanical transmission of power. In the car, hydraulic transmission fluid transmission, namely liquid as the transmission medium, the use of liquid in the active component and cycles between the driven component in the flow of kinetic energy to transmit power. Dynamic fluid transmission fluid couplings and torque in two ways. Transmit torque hydraulic coupler only, and can not change the size of the torque, can replace clutch parts, which guarantees a smooth start and Acceleration, but can't guarantee when shifting gears in a transmission from the impact. Hydraulic torque converter in addition to the functions of hydraulic coupler full, can realize stepless variable speed applications than hydraulic Coupler is much wider. However, the output of hydraulic torque converter torque ratio with the input torque is not sufficient to meet the requirements,generally in subsequent series a-level mechanical transmission and hydro-mechanical transmission to replace the mechanical transmission clutches and transmissions. Hydro-mechanical transmission system based on resistance changes automatically in several realize stepless speed range, and stage mechanical transmissions butalso can realize the automatic or semi-automatic control, thus the driver operationgreatly simplified. But because of its complicated structure, high cost, low mechanical efficiency of the shortcomings, in addition to limousine and part other than heavy vehicles, cars and trucks rarely use.

Hydrostatic transmission system

Hydrostatic transmission system, also known as volumetric hydraulic transmissionsystem. Consists of pumps, hydraulic motors and control devices and so on. Engine mechanical energy through the pump to hydraulic energy, and then again by a hydraulic motor which is converted to mechanical energy. Diagram scenarios, onlyone motor is used to transmit power to drive axle final drive, differential, axle shaft to the drive wheels. Another programme is each of the driving wheels are mounted on a motor. The latter programme, final drive, differential and half shaft, mechanical transmission parts can be de-hydrostatic transmission, due to low mechanicalefficiency, high cost, service life and reliability is not ideal and only on some military vehicles began to use.

-Power transmission system

Electric power transmission system by the engine-driven generator 2, 3 of the rectifier and the inverter (DC and then converted to a variable frequency AC devices), and electric wheels (internal drive wheel equipped with a traction motor and gear reducer) and so on. Performance of power transmission lines with the hydrostatic type transmission system similar to, but much larger mass ratio of motor pumps and hydraulic motors, therefore only on the super heavy duty truck application.

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