Automatic transmission and vehicle

Abstract

The invention provides an automatic transmission. Due to reasonable layout, the automatic transmission can be provided with six forward gears and one reverse gear by controlling two brakes and three clutches. Only the two brakes are used by directly fixing a third sun gear on a box body, and therefore, on one hand, the structure of the automatic transmission is more compact, and on the other hand, the impact of the brakes to the box body in a gear shifting process is reduced, and the loaded condition of the box body is improved. Relatively speaking, the amount of the brakes is reduced, the amount of the clutches is increased, and therefore, on one hand, the automatic transmission can be more compact by nesting layout, and on the other hand, the utilization ratio of the clutches can be increased, an idle transfer line is disconnected or shortened, furthermore, the drag torque of an idle planet row is reduced, the churning loss of a belt row is reduced, and the transmission efficiency is increased.

Description

technical field [0001] The invention relates to the field of automatic transmission, in particular to an automatic transmission and a vehicle with the automatic transmission. Background technique [0002] Automatic transmissions generally include multiple planetary gear sets, brakes and clutches, and multiple planetary gear sets, brakes and clutches are connected together in a certain way. When the torque generated by the engine enters the automatic transmission, the automatic transmission can multi- The torque entering it is changed step by step, and the changed torque is output outward. Generally speaking, the more gears an automatic transmission has, the better the car's power performance and fuel economy. However, as the number of gears increases, the number of planetary gear sets, brakes and clutches will increase, satisfying the theoretical level. The design of the ratio is even more difficult to realize. The major vehicle manufacturers and vehicle research institutes...

AI Technical Summary

Problems solved by technology

[0008] Among them, the Lepe Laijie scheme is realized by adding a row of planetary gear sets on the basis of the Lavina 4-speed automatic transmission. There is no direct gear, too many components, and a complex structure, which is not conducive to lightweight

[0009] Both the general and modern schemes are implemented with three planetary gear sets. The difference lies in the position of the clutches. They both use a combination of two clutches and three brakes to control the realization of each gear. In this automatic transmission, the number of brakes The number of clutches is more than the number of clutches. Since the brake is generally fixed on the box, the increase of the brake increases the difficulty of processing and manufacturing the automatic transmission box, increases the requirements for the strength of the box, and creates a problem for the lightweight design of the box. Difficult, further increasing the size and weight of the automatic transmission

[0010] In the modern mass production series A6MF and A6LF, one planetary gear set uses a double planetary gear structure. Compared with a single planetary gear, it is not conducive to the compactness of the structure and increases the weight and cost.

Images