What's the difference between stepless speed change and automatic manual transmission?

The difference between continuously variable transmission and automatic manual transmission is as follows:

First, the structure is different.

CVT and automatic manual transmission are very similar in gear shape, and both adopt direct gear. However, it is not difficult to see from the inside that their biggest difference lies in the transmission chain.

1, continuously variable transmission chain uses friction between chain and bevel gear to transmit torque, not gears. The transmission is simple in structure and small in size, so it can transmit strong power when shifting, and keep high torque while minimizing power loss, wear and noise.

2. The transmission chain of hand-to-hand integration is a gear shift mode, which is huge and the planetary gear set is complex. You can obviously feel a sense of frustration.

Second, the fuel consumption is different.

The biggest feature of continuously variable transmission is fuel saving. The continuously variable transmission abandons the hydraulic transmission device which wastes energy in the traditional automatic transmission, and adopts new technology to improve the fuel utilization rate. Continuously variable transmission has high fuel utilization ratio, saving 5% to 15% compared with traditional automatic transmission.

Third, shifting gears is different.

1, stepless speed change, no signs of gear increase or decrease can be seen from the appearance, only directional differences such as forward and backward. Continuously variable overtaking at high speed, high-speed cornering is smoother than automatic gear.

2. The manual mode of manual-automatic integration is still an automatic transmission mode under traditional conditions, but the shift direction of manual gear is changed to linear motion, and automatic motion can be realized from the direction of motion, but it is still a low-speed to high-grade shift.

Extended data:

Classification of continuously variable speed:

1, liquid driven

One is hydraulic type, which is mainly a variable speed transmission device composed of pump and motor or valve and pump, and is suitable for medium and small power transmission. Hydraulic type also includes hydrostatic type and hydro-mechanical type. The other is hydraulic type, which adopts hydraulic coupler or hydraulic torque for variable speed transmission and is suitable for high power (hundreds to thousands of kilowatts). ?

2. Electric drive

One is electromagnetic slip type, which is a reverse speed regulation method by installing an electromagnetic slip clutch in asynchronous motor to change its excitation current. The second type is DC motor type, which realizes speed regulation by changing magnetic flux or armature voltage. ? The third type is the AC model, which adjusts the speed by changing poles, regulating voltage and frequency.

3. Mechanical transmission

The main characteristics of unified mechanical transmission are: stable rotating speed, small sliding rate, reliable operation, constant power mechanical characteristics and poor impact, so it is generally suitable for medium and small power transmission, with high transmission efficiency, simple structure, convenient maintenance and relatively cheap price.

References:

Baidu encyclopedia-stepless speed change

Baidu Encyclopedia-Integration of Hands and Hands