Parallel double-input-shaft transmission system and gear-shifting control method thereof

Abstract

The invention discloses a parallel double-input-shaft transmission system and a gear-shifting control method thereof. The system comprises a transmission input shaft I, a transmission input shaft II, a transmission output shaft, a first-gear gear set, a second-gear gear set, a third-gear gear set, a fourth-gear gear set, a joint sleeve I and a joint sleeve II. By means of the parallel double-input-shaft transmission system, three-gear switching can be achieved. According to the system, transmission space can be effectively saved, the layout is reasonable, gear shifting can be achieved under the condition that power is not stopped, gear shifting is stable and smooth, the structure is compact, and manufacturing, machining and assembling are facilitated; one-to-one meshing is adopted in all gear-shifting gear sets, shared gears are avoided, the transmission ratio is optimized, and the bearing capacity of the gears is reasonably used; by means of the gear-shifting control method, generated of power needed for maintaining travelling in the gear-shifting process can be achieved; electric energy losses are reduced, and the runtime of a vehicle is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle transmission, and in particular relates to a parallel double input shaft transmission system and a shift control method thereof. Background technique [0002] Environmental protection and energy saving are important issues facing the world in the 21st century. The Chinese government has also proposed the basic national policy of building a conservation-oriented society and the industrial development policy of encouraging the development of small-displacement energy-saving vehicles. Electric vehicles are the way to achieve this goal. One of the important means. [0003] At present, there are many pure electric drive systems in the market, mainly including: multi-speed transmission and traditional drive system with clutch; multi-speed transmission and drive system without clutch; two independent drive motors and drive shaft Fixed gear transmission; drive motor and primary reducer transmiss...

AI Technical Summary

Problems solved by technology

The traditional drive system with multi-speed transmission and clutch has better acceleration, but there is power interruption when shifting gears; multi-speed transmission and drive system without clutch have high transmission efficiency and no power interruption; the drive motor and primary reducer The transmission device can achieve stepless speed change, but the acceleration and climbing ability are poor, and the efficiency of the drive motor is not fully utilized

On the other hand, the car has different power requirements during the acceleration, low-speed and high-speed driving stages. If a single motor is used, it is difficult for the motor to work in the high-efficiency operating area all the time, which will easily cause waste of electric energy.

In particular, there are still many defects in the current transmission system, for example, the unreasonable structural design leads to the short service life of the gear bearing, the poor utilization of the load-carrying capacity of the gear, the complicated structure, and the inconvenience of manufacturing and assembly, etc.

[0004] For example, although a certain patent technology also discloses a transmission device with dual input shafts, its disadvantages are that the gear sets of each gear are shared alternately, the transmission ratio is poor, the utilization rate of the load-carrying capacity of the gears is low, and the service life of the bearings is short.

Images