Synchronizer-free shifting system for regulating speed of intermediate shaft of electric automobile

Abstract

The invention relates to a front-engine rear-drive automatic mechanical transmission case shifting system for a driving motor, in particular to a synchronizer-free shifting automatic mechanical transmission case for regulating the speed of an intermediate shaft based on a small quantity of gears, belonging to the technical field of automobile control. The system comprises an input shaft, an intermediate shaft, an output shaft, driving and driven gears for each gear, a splined hub, a jointing sleeve, a sensor, a speed regulating motor, a speed regulating motor transmission mechanism, a clutch operating mechanism, a shifting executing mechanism and a controller. According to the system, the rotating speed of the intermediate shaft is regulated through the speed regulating motor, so that synchronization of the jointing sleeve and a target gear during shifting is realized, a synchronizer with high material requirements is eliminated, reduction in the cost is facilitated, and the effect of compatibility among startup, accelerating performance and relatively high-speed running of a small-sized pure electric automobile is realized simultaneously.

Description

technical field [0001] The present invention proposes a synchronizer-less shifting system for electric vehicles to adjust the speed of intermediate shafts, and in particular relates to an automatic mechanical gearbox based on fewer gears for driving electric vehicles with front and rear drive motors (hereinafter AMT for short) shift system belongs to the field of electric vehicle control technology. Background technique [0002] With the increasing attention to environmental issues and the extreme shortage of petroleum energy in today's society, people have invested heavily in the research and production of new energy vehicles. Among them, electric vehicles have the advantages of zero pollution and zero fuel consumption in today's society. Society plays an increasingly important role. [0003] At present, electric vehicles have been put into use, but their structure is directly driven by a motor without a transmission. The power is directly transmitted to the drive shaft th...

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Problems solved by technology

[0003] At present, electric vehicles have been put into use, but their structure is directly driven by a motor without a transmission. The power is directly transmitted to the drive shaft through one or two stages of deceleration, which ensures the starting and climbing performance, but at the expense of high-speed driving. At the same time, since there is no gearbox, climbing or acceleration are basically directly driven by the drive motor, and the maximum torque T of the motor max and maximum speed n max High requirements, which will increase the quality, volume and cost of the motor or the whole vehicle

Or an electric vehicle equipped with a two-speed gearbox, although it satisfies the starting and climbing and high-speed performance to a certain extent, it has limitations: either start or climb at a low speed and high torque, or drive at a high speed without intermediate normal driving speeds. At the same time, the efficiency of the motor is greatly reduced when the motor is running at high speed, and the power consumption is increased; even if the second gear is set to a lower normal driving speed, it cannot meet the relatively high speed driving, which may also cause certain damage to the traffic. Impact

If there are too many gears in the gearbox, the structure will become complicated, and the volume and mass will inevitably increase

Similarly, existing electric vehicles use traditional mechanical mechanism synchronizers when shifting gears. The friction between the lock ring of the synchronizer and the conical surface of the ring gear is used to achieve synchronization to reduce the impact between the meshing teeth when shifting gears. However, the requirements for the manufacturing materials of the synchronizer are high. Higher cost and more complicated structure

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