Dual-drive two-gear automatic transmission

Abstract

The invention discloses a dual-drive two-gear automatic transmission, and belongs to the technical field of electric automobiles. The dual-drive two-gear automatic transmission is characterized by comprising a speed reduction gear set, an input gear of the speed reduction gear set is connected with two power input mechanisms at the same time, and the two power input mechanisms drive the input gear to transmit at the different speed ratios. According to the dual-drive two-gear automatic transmission, a speed reduction mechanism and the two power input mechanisms engaged with the speed reduction mechanism at the same time are arranged, through switching of the power input mechanism, an output gear of the speed reduction mechanism transmits at the different speed ratios, gear shifting and speed change of an electric automobile during driving can be achieved, the phenomenon that in the prior art, the gear shifting process can be completed through gear switching is avoided, the gear shifting process is smoother, and due to the fact that the structure is quite simple, the beneficial effect of high transmission efficiency is achieved.

Description

technical field [0001] A dual-drive two-speed automatic transmission belongs to the technical field of electric vehicles. Background technique [0002] With the increasing shortage of resources in today's society and the call of the national energy conservation and emission reduction policy, electric vehicles are accepted by more and more people as a new type of transportation. Compared with the engine (internal combustion engine) of ordinary cars, the electric motor of electric vehicles has the biggest advantage: the energy efficiency range of electric motors is much larger than that of engines, so in electric vehicles, there is no need to equip multi-gear gears in ordinary cars. The gearbox can meet the driving requirements of electric vehicles in most road conditions. Therefore, in the prior art, most electric vehicles realize the drive of the electric vehicle by the electric motor by setting a reducer between the electric motor and the wheels, and the electric vehicle T...

AI Technical Summary

Problems solved by technology

The speed of the motor is much faster than that of the engine, and there is no gearbox, so the speed of the vehicle can only be increased by increasing the speed of the motor, which greatly improves the performance requirements of the motor. At the same time, at high speed, the energy consumption Greatly improved, battery life has been weakened

Therefore, there is the problem that pure electric vehicles equipped with fixed gear ratio reducers are not economical, and the ideas of major electric vehicle manufacturers are constrained by the theory that "electric vehicles do not need transmissions". Therefore, in order to improve the battery life of electric vehicles, currently Most manufacturers are pinning their hopes on major breakthroughs in battery technology or the use of electric motors with better performance (such as higher power and higher speed). Not the optimal way, specifically: under normal circumstances, the price of battery packs will account for 35% to 40% of the total price of electric vehicles, so the use of new technologies or battery packs with larger capacities will inevitably increase the cost of electric vehicles And its own weight; and the use of motors with better performance will not only greatly increase the cost of electric vehicles, but also a major test for the transmission system of electric vehicles. Therefore, with the gradual development of electric vehicle technology in recent years , especially since 2015, the world's pure electric vehicle researchers have abandoned the concept of "pure electric vehicles do not need a gearbox, only rely on the inherent characteristics of the motor, and it is fully satisfied with the reducer", and formed a unified consensus : For pure electric vehicles, the gearbox is not a "superfluous", but "icing on the cake", and can greatly improve the performance of pure electric vehicles

[0004] Although R&D personnel are aware of the necessity of using transmissions in electric vehicles, and the transmissions in ordinary cars are relatively mature, the transmissions in ordinary cars cannot be directly transplanted to electric vehicles for use because of: (1) , It can be seen from the above that since the energy efficiency area of ​​the motor is much wider than that of the engine, the motor does not need to match multiple different gears to ensure that it works in the best state, so the gearbox on an ordinary car is directly transplanted to a pure There will be a huge overcapacity of the transmission in electric vehicles

(2) The gearbox on an ordinary car has more comprehensive functions, so the cost is relatively high, which will greatly increase the production cost of the electric car itself

(3) Due to the large number of gears and complex structure of the gearbox on an ordinary car, its own weight is relatively heavy, so it will greatly reduce the battery life of the electric car

[0006] (1) From the above, it can be seen that in electric vehicles, the two-speed gearbox can fully meet the needs of electric vehicles, but the reduction of gears means that the speed ratio difference between the two gears is large, so when shifting gears Whether it is manual shifting or automatic shifting, the frustration of shifting is particularly obvious, which seriously affects driving comfort and driving safety.

[0007] (2) At present, almost all automatic transmissions require a shifting mechanism. From the above, there will be obvious frustration when shifting between two gears, which makes pure electric vehicles Motors and gearboxes have great difficulty in logical control, which is one of the objective reasons why electric vehicles do not use gearboxes

[0010] (5) In view of the requirements for the battery life of electric vehicles, the gearboxes of electric vehicles need to have high transmission efficiency. At present, in ordinary vehicles, even the most high-end dual-clutch gearboxes can only achieve 90% transmission efficiency. %about

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