Two-gear type electric transmission free of gear shift power interruption

Abstract

The invention relates to a two-gear type electric transmission free of gear shift power interruption. The electric transmission comprises a driving motor, a transmission gear assembly and a differential mechanism which are connected in sequence, wherein the transmission gear assembly comprises a first gear shifting element, a second gear shifting element, an input shaft, a middle shaft, an outputshaft, a first-gear driving gear, a first-gear driven gear, a second-gear driving gear, a second-gear driven gear, a main reducer driving gear and a main reducer driven gear, the input shaft is connected with the driving motor, the first-gear driving gear and the second-gear driving gear are connected with the input shaft correspondingly, the first-gear driven gear, the second-gear driven gear andthe main reducer driving gear are connected with the middle shaft correspondingly, the main reducer driven gear is connected with the differential mechanism, the first gear shifting element comprisesa left joint part, a right joint part and a synchronous part, the synchronous part is connected with the input shaft or the middle shaft, and the second gear shifting element is arranged between thesecond-gear driving gear and the input shaft or between the first-gear driven gear and the middle shaft. Compared with the prior art, the electric transmission has the advantages of no power interruption, compact structure and the like.

Description

technical field [0001] The invention relates to the technical field of transmissions, in particular to a two-speed electric transmission without shifting power interruption. Background technique [0002] At present, most pure electric transmissions are single-gear transmissions. Although the electronic control is not difficult and the vehicle drivability is good, the driving efficiency of the driving motor is easily affected under high-speed conditions, and the power demand of the motor is too large, resulting in the size and size of the motor. The cost is too high; while the shifting of the existing second-speed transmission can effectively improve the working efficiency of the driving motor and reduce the maximum power demand of the driving motor, but its shifting elements are all general double-clutch or double-sided synchronizer structures, using dual The clutch can realize power shifting without interruption during the shifting process, but the difficulty of electronic ...

AI Technical Summary

Problems solved by technology

[0002] At present, most pure electric transmissions are single-gear transmissions. Although the electronic control is not difficult and the vehicle drivability is good, the driving efficiency of the driving motor is easily affected under high-speed conditions, and the power demand of the motor is too large, resulting in the size and size of the motor. The cost is too high; while the shifting of the existing second-speed transmission can effectively improve the working efficiency of the driving motor and reduce the maximum power demand of the driving motor, but its shifting elements are all general double-clutch or double-sided synchronizer structures, using dual The clutch can realize power shifting without interruption during the shifting process, but the difficulty of electronic control and structural complexity increase. Although the difficulty of electronic control is low and the complexity of the system is reduced, the cost of the synchronizer system is also lower. It is currently a more cost-effective choice. , but there is a shift power interruption

However, whether it is a clutch system or a synchronizer system, its complexity is relatively high, its volume and cost are difficult to reduce, and the overall volume and weight of the entire transmission are relatively large

In addition, most transmission systems adopt a distributed structure, and the motor and its controller are not integrated into the transmission housing and its controller, which also results in a compact structure of the transmission.

[0003] Patent CN 105805260 A discloses a rear axle drive device for electric vehicles, which also adopts a 2-speed form, and the shift element is a synchronizer system, and the shift element is located on the intermediate shaft. Compared with the input shaft, the transmission axial size, the drive motor is not integrated into the transmission

In addition, there is a problem of power interruption during the shifting process, which affects the drivability of the vehicle

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