1. Gear shifting aims at reducing fuel consumption.

2. Always use the maximum power of the engine.

3. All driving conditions have corresponding shift points.

4. Shift points can be changed at will.

Working principle:

In the CVT transmission system of automobile transmission, the traditional gear is replaced by a pair of pulleys and a steel belt. Each pulley is actually a V-shaped structure consisting of two conical disks. The engine shaft is connected with the small pulley and drives the big pulley through the steel belt. The mystery lies in this special pulley: the transmission pulley of CVT has a strange structure and is divided into two movable halves, which can be relatively close or separated.

The conical disk can be tightened or opened under the hydraulic thrust, and the width of the V-shaped groove can be adjusted by extruding the steel chain. When the conical disk moves inward and tightens, the steel chain will move out of the center of the circle (centrifugal direction) under the extrusion of the conical disk, and vice versa. In this way, the diameter of the disc driven by the steel chain increases and the transmission ratio changes.

Extended data:

Development history:

As early as 1886, the V-type rubber belt CVT was installed on the gasoline engine car produced by this company. 1958, Dr. H.Van Doorne of Dutch DAF company successfully developed a double V-shaped rubber belt CVT named Variomatic, which was installed on Narcissus cars manufactured by DAF company, and the sales volume exceeded 1 10,000 vehicles.

Since 1990s, the research and development of CVT technology has been paid more and more attention by the automobile industry, especially in mini-cars, CVT is considered as the key technology. With the rapid development of global science and technology, new electronic technology and automatic control technology are constantly being adopted in CVT.

1997 in the first half of the year, Nissan developed CVT for 2.0L cars. On this basis, Nissan developed 1998 CVT with manual shift mode for medium-sized vehicles.

1987, Subaru of Japan put the car equipped with CVT transmission on the market and achieved success. Ford and Fiat in Europe are also equipped with VDT-CVT on cars with displacement from 1. 1L to1.6L. With the development of technology, the global awareness of energy conservation and environmental protection has been enhanced by the energy crisis. Based on the experience of the first generation CVT, a CVT with better performance and greater torque capacity is developed.

Baidu encyclopedia -CVT (automobile transmission)

Baidu encyclopedia-automobile transmission