Automatic transmission and vehicle

Abstract

The invention relates to an automatic transmission which has ten forward gears and one reverse gear through reasonable arrangement of four planetary gear sets and six clutches. Through control of three clutches, power transmission under the gear can be guaranteed; on the premise that the transmission efficiency and the planet wheel rotating speed of the automatic transmission are guaranteed, a first gear ring is directly fixed to a box without using a brake; on one hand, the structure of the automatic transmission is more compact; and on the other hand, impact of the brake on the box in the gear shifting process is reduced, and the loading condition of the box is improved. Comparatively speaking, the brake is not used, the number of the clutches is increased, on one hand, the automatic transmission is more compact through the nested arrangement, and on the other hand, the using rate of the clutches can be increased, the idle shortening transmission line is disconnected, idle planetary gear set dragging torque is reduced, drag torque oil stirring losses are reduced, and the transmission efficiency is improved.

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 transmission (Automatic Transmission, AT) generally includes multiple planetary gear sets, brakes and clutches. 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 According to different working modes, the torque entering it is changed in multiple stages, and the changed torque is output outward. It can be seen from the mechanical principle that the condition for a mechanism to have definite motion is that the number of power sources of the mechanism is equal to the number of degrees of freedom of the mechanism's rotational speed. Since AT achieves different gears through the combination of different clutches / brakes, tha...

AI Technical Summary

Problems solved by technology

[0008] Whether it is the 10R80 scheme or Toyota's scheme, it is realized by using four clutches and two brakes, that is to say, there will be two brakes, and the brakes will eventually be connected to the box through connecting parts, such as friction steel teeth. The existence of the brake increases the difficulty of processing and manufacturing the box; at the same time, because the material of the box is generally aluminum alloy, the brake will cause impact on the box when it is closed, and the strength of the box is high, which will affect the strength of the box. Lightweight design creates difficulties and ultimately adds weight to the automatic transmission

Images