英文原文
Stepless speed technology
Stepless speed tee 加 ology USES belt and the work of the Lord diameters driven pulley, cooperated with the power to deliver, can realize the TRANSMISSION ratio of the continuous change, and get the TRANSMISSION and engine condition the best match between. Common step-less transmission have hydraulic mech 皿 cal step-less transmission and belt type step-less transmission, the current domestic market of the vehicles already more and more. Editor this section step-less transmission and the origin of the automatic transmission
Automatic transmission is easy to operate, reduce fatigue driving, born of the gear drive system, the control method, it can be divided into the hydraulic controlled hydraulic and electric automatic transmission hydraulic automatic transmission; According to the change of the transmission way and can be divided into have levels of automatic transmission and no le
vels of automatic transmission. Ther efore, step-less transmission is actually a kind of automatic transmission, but it than common automatic transmission is much more complex, more advanced tec 血 ologies. Step-less transmission and common hydraulic automatic transmission of the biggest differences is on the structure, the latter is by hydraulic control gear 如 ve system structure, still have the gears, it can be realized in between the two block is continuously variable transmission, and is two groups plate and a belt speed of than traditional automatic transmission, simple structure, smaller. In addition, it is free to change gear ratios, so as to realize the full speed stepless speed change, make more smoothly, without the traditional transmission shift at the'"'feeling. Editor this section step-less transmission classification
To realize stepless speed, 如 ving mode can be adopted according to the liquid transmission, power transmission and mech皿cal drive three ways.
Liquid transmission
Liquid transmission is divided into two kinds: one kind is hydraulic, mainly is composed by t
he pump and motor or the valve and pump v缸 able speed of transmission device, apply to small and medium-sized power transmission. Another kind is hydraulic type, adopts hydraulic coupler or hydraulic torque of variable speed drive, used in high power(kw)To hundreds of thousands of The main characteristics of liquid transmission is: speed range, can absorb the impact and big to prevent transmission efficiency high, overload, long life, easy to realize automation: manufacturing precision demand is high, the price is more expensive, output characteristics for constant torque, sliding rate is bigger, running vulnerable to leak.
Power transmission
Power transmission basically is divided into three categories: one kind is electromagnetic sliding type, it is in the asynchronous motor installed in electromagnetic clutch, sliding by changing its exciter current to speed, this belongs to a kind of relatively backwardspeed adjustment way. The

pulleys
characteristics of simple structure, low cost, convenient operation and maintenance, sliding, low efficiency, biggest fever, not suitable for long-term serious load operation, the general used only for small power transmission. Second is the dc motor type, changes in the magnetic flux or change the armature voltage realize the speed. Its characteristic is speed range, high precision, large and complex, high cost but equipment, maintenance difficulties, are used for medium power range (dozens to hundreds of kw), has gradually been ac motor type instead. Three kinds of ac motor type is, through the change pole, pressure control and frequency conversion for the speed. The most practical application for variable frequency speed regulation, namely deserve using a horns, and then get luffing power drive motor variable speed. Its characteristic is the speed performance is good, range, high efficiency, it can automatic control, small volume, it is suitable for a wide range of power: mechanical properties in single reducing speed constant torque, low efficiency and low speed running smooth enough, the price is higher, maintenance should be professional. In recent years, frequency converter as an advanced, excellent variable speed device rapid development of machinery, step-less transmission produced a certain impact
Mechanical transmission
The main characteristic of the mechanical transmission is stable, rotate speed sliding rate, reliable, and has small constant power mechanical properties, the transmission efficiency is high, and simple structure, convenient maintenance, the price is relatively cheap; But parts processing and lubrication to demand higher bearing capacity, low resistance, resistance to 皿pact overload and poor, so general suitable for medium and small power transmission.
1, MT
The manual transmission(MT: Manual Transmission) gearset, because the number of teeth of each gear is fixed, each gear ratio is a fixed value (that is, the so-called "level"). For example, a block ratio of 3.455, the second gear is 2.056 to the five-speed 0.85, these figures are multiplied by the main reduction ratio is the total transmission ratio of the power train, 5-speed transmission 5 value (ie 5 level), so it is a step-variable transmission. The manual transmission is the most common transmission, composed of relatively AT and CVT, its structure is simple, the main axis of the input shaft, output shaft and the intermedia
te shaft, the shaft bearings, each gear, the synchronizer, the shift operating mechanism. Manual transmission failure rate is relatively low, the use of lower cost.

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