All gear stepless automatic transmission and speed ratio active control system

Abstract

The invention provides an all gear stepless automatic transmission and speed ratio active control system. The all gear stepless automatic transmission and speed ratio active control system is characterized in that a speed ratio active control mechanism is arranged between a torque proration differential mechanism and a planetary gear mechanism, the torque proration differential mechanism comprisestwo differential bevel gears, the two differential bevel gears are respectively connected with a gear ring and a sun gear of the planetary gear mechanism, and used as input shafts of the planetary gear mechanism, the speed ratio active control mechanism comprises a speed ratio adjustment motor, and further comprises a speed ratio adjustment driving gear and a speed ratio adjustment driven gear which are in a constant meshing state, the speed ratio adjustment driven gear is rigidly connected with one of the differential bevel gear shafts, the speed ratio adjustment driving gear is connected with a speed ratio adjustment motor, and the planetary gear mechanism is respectively meshed with the sun gear and the gear ring, and outputs power to the exterior through a planet carrier. The all gearstepless automatic transmission and speed ratio active control system is large in speed ratio variation range, has torque transmission capacity which can meet all mechanical transmission requirements, effectively realizes stepless automatic transmission in the whole speed ratio vibration range, and further can perform active control on the speed ratio.

Description

technical field [0001] The invention relates to the technical field of power transmission systems, in particular to an all-gear stepless automatic variable speed power transmission system. [0002] technical background [0003] The power transmission system (or device) is the most basic and important part of all machinery. Its function is to transmit the power from the power source (such as engine, steam turbine, water turbine or electric motor, etc.) Drive wheels of vehicles, propellers of ships, spindles / cutters of machine tools, rotary tillers, hydraulic pumps, compressors, blowers, etc.). Since the dynamic characteristics of the power source (such as the change of power, torque, etc. with the speed) are often quite different from the requirements of the working mechanism or working machinery, the power transmission device between the power source and the working mechanism or working machinery needs to have Speed ​​reduction or variable speed function, which is why transm...

AI Technical Summary

Problems solved by technology

For the mechanical stepped transmission with 4-6 gears, not only the speed ratio between each gear has a large step difference, which makes it impossible for the power source to always work in the high-efficiency area, but also the speed ratio changes in steps during the shifting process, so its power transmission The characteristics are not ideal; for the main and auxiliary transmissions with more than 6 gears, although the probability of the power source working in the high-efficiency zone increases and the speed ratio difference between each gear is reduced, not only the speed ratio step in the shifting process Problems such as changes and unsatisfactory power transmission characteristics still exist, and due to the increase in the number of gears, the shifting operation is more complicated, which puts forward higher requirements for the operator's technical level

⑵The electronically controlled mechanical stepped automatic transmission (AMT) is an improved version of the manual mechanical stepped transmission. The speed change transmission part is almost identical to the original mechanical manual stepped transmission. The original manual mechanical stepped transmission has the same disadvantages as "large speed ratio difference between each gear, step change in speed ratio during gear shifting, and unsatisfactory power transmission characteristics". operate

(3) The automatic adjustment of the diameter of the driving and driven pulleys in the belt-type continuously variable automatic transmission (CVT) and the hydraulic torque converter in the hydraulic automatic transmission (AT) have the function of continuously variable speed, but the common disadvantages of the two are : ①The variation range of the speed ratio is small, and often needs to be used in conjunction with another stepped mechanical transmission to meet the requirements of the range of speed ratio variation in various types of machinery; ②Low transmission efficiency and high energy consumption; ③Complicated structure and high manufacturing cost; ④ For CVT, there is still a very limited ability to transmit torque and the disadvantage of not being able to transmit large torque, so it is only applied to small vehicles and small equipment

Even so, since the dual-clutch automatic transmission (DCT) is also a mechanical stepped transmission, the disadvantages of "the speed ratio between each gear has a step difference, the speed ratio changes stepwise during the shifting process, and the power transmission characteristics are not ideal" still exist. Exist, but the above shortcomings are reduced to a certain extent

In addition, due to the complex structure and process of the dual-clutch automatic transmission (DCT), the manufacturing cost is high and the adaptability to the use environment is poor.

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