What is the difference between a continuously variable gearbox and a normal gearbox?

Ordinary gearbox is to disengage with the clutch by foot, and then shift gears. The automatic transmission can complete the steps of changing gears automatically.

The continuously variable gearbox is relatively stable and has a relatively fast start.

The meaning of the continuously variable transmission is that there is no clear fixed gear, and the transmission can be continuously varied, so that the speed change can be faster for the car, the performance is more balanced, and the actual driving will be smoother.

The biggest advantage of CVT continuously variable gearbox is that it has good ride ride and is relatively fuel-efficient, because the principle of its steel belt transmission is not as efficient as that of gear transmission, but because it does not have the action of shifting, the power is continuous, so the power will not be interrupted when shifting, and it will naturally be more fuel-efficient. The previous CVR continuously variable transmission could not withstand a large engine torque due to material and technical problems, but with the advancement of technology, the CVT continuously variable transmission can already withstand a relatively large torque.

The meaning of continuously variable gearbox:

1. The continuously variable transmission is divided into variable inclined continuously variable transmission and CVT continuously variable transmission;

2. The continuously variable gearbox eliminates the complex and cumbersome gear combination transmission transmission, and only uses two sets of pulleys for variable speed transmission;

3. By changing the contact radius of the driving wheel and the driven wheel transmission belt for speed shifting, because the CVT can realize the continuous change of the transmission ratio, so as to obtain the best match between the drive train and the engine working conditions, improve the fuel economy and power of the vehicle, improve the driver's control convenience and the riding comfort of the occupants, so it is an ideal automobile transmission device.

Automotive CVT refers to a transmission system that can continuously obtain any transmission ratio in the transmission range. The continuously variable speed can be used to obtain the best possible match between the drive train and the engine operating conditions.

The continuously variable gearbox eliminates the need for complex and cumbersome gear combination transmission, and only uses two sets of pulleys for variable transmission. By changing the contact radius of the driving wheel and the driven wheel transmission belt for speed shifting, because the CVT can realize the continuous change of the transmission ratio, so as to obtain the best matching between the transmission and the engine working conditions, improve the fuel economy and power of the whole vehicle, improve the driver's ease of operation and the riding comfort of the occupants, and is an ideal automobile transmission device.

Continuously variable transmission is also called CVT, but many people have rarely touched the car of continuously variable transmission, so the car that causes automatic transmission is also called continuously variable transmission, in fact, the continuously variable transmission is without a clutch, and the transmission mode is not the same, the automatic transmission is driven by gears, and the continuously variable transmission is driven by two or more special steel belts, forming a direct docking with the engine crankshaft flywheel, and there is no gear limit, so when driving and stepping on the accelerator, how deep you step on the accelerator will be how fast the car will run, One foot on the accelerator to the bottom of the car can instantly drive at a speed of 6000 rpm, because the continuously variable transmission has no shift process, so the acceleration is often faster than the automatic transmission car, in addition to the automatic transmission is smaller than the automatic transmission size, light weight, acceleration without the shift process, so the fuel consumption is lower than the use of automatic transmission car. The CVT achieves fuel consumption equivalent to its own displacement with no shift backlash, no acceleration frustration, and zero power loss. And in terms of maintenance, it will save customers most of the costs, and there is no need for maintenance and repair under normal use.

Simply put, it is an automatic transmission car.

According to Bian Xiao, many friends don't know much about some car knowledge. In order to facilitate everyone to understand this knowledge, today Bian Xiao will introduce the types of CVT to you. For those who are interested in this question, you can learn about Wang You, which may be helpful to you.

CVT (Continuously Variable Transmission) technology is continuously variable transmission technology. It uses the transmission belt to transmit power with the driving wheel and driven wheel with variable working diameter, which can realize the continuous change of the transmission ratio, and then obtain the best match between the transmission system and the engine working conditions. Depending on the transmission mode, liquid transmission, electric transmission and mechanical transmission can be used.

1.Liquid transmissionLiquid transmission includes two types: one is hydraulic, the key is a variable speed transmission device composed of a pump and a motor or a valve and a pump, which meets the objective requirements and is suitable for small and medium power transmission.

The other type is hydraulic, which uses a hydraulic coupling or hydraulic torque for variable speed transmission to meet the objective requirements of high power (hundreds to thousands of kilowatts). The key features of liquid transmission are: wide speed range, shock absorption to avoid overload, high transmission efficiency, long service life, easy automation, high manufacturing accuracy, high torque output, large sliding rate, easy oil leakage when rotating.

2.Electric driveElectric transmission basically includes three types: one is electromagnetic sliding type, in which an electromagnetic slip clutch is installed in the asynchronous motor to adjust the speed by changing its excitation current, which is a relatively backward speed regulation method.

It is characterized by simple structure, low cost, convenient operation and maintenance: maximum sliding, low efficiency, serious heating, not suitable for long-term load rotation, so most of them are only used for low-power transmission. The second type is the DC motor type, and the balance section realizes speed regulation by changing the magnetic flux or armature voltage.

It is characterized by a large range of speed regulation and high precision, but the equipment is complex, the cost is high, and the maintenance is difficult. It is mostly used in the medium power range (tens to hundreds of kilowatts), which has been gradually replaced by AC motors. The third type is the AC motor type, which regulates the speed by pole change, voltage regulation, and frequency conversion.

The most practical application is frequency conversion speed regulation, that is, the use of amplitude change rod to obtain amplitude power supply, and then drive the motor to change speed. It is characterized by good speed regulation performance, large range, high efficiency, automatic adjustment, small size, and a wide power range to meet the requirements of objective conditions: the mechanical characteristics are that the torque in the deceleration stage remains unchanged, the efficiency is low at low speed, the rotation is unstable, the highest is high, and the maintenance needs professionals.

In recent years, the inverter has developed rapidly as an advanced and excellent transmission device, which has caused a necessary impact on the mechanical continuously variable speed transmission. 3.The key features of mechanical transmission are:

Stable speed, low sliding rate, reliable work, constant power mechanical characteristics, high transmission efficiency, simple structure, easy maintenance, lower than the previous year; However, the parts have high requirements for production, processing and lubrication, low bearing capacity, poor overload and impact resistance, so most of them are suitable for small and medium power transmission.

Introduction to the difference between an automotive CVT and an automatic transmission:

1. The AT gearbox has a real gear, its shift action is several points, the CVT gearbox does not have a real gear, you can change the distance anytime and anywhere, the best way to distinguish them is to evenly fuel the start acceleration;

2. Observe that the pointer of the tachometer AT gearbox has an obvious upshift action, generally speaking, the speed is increased and then lowered to regenerate high, while the CVT gearbox has been slowly increasing the speed or maintaining a speed;

3. Advantages and disadvantages of the two gearboxes AT gearbox can provide the driver with a good driving feeling, and CVT can make the car smoother and more fuel-efficient.