Electromobile three-gear speed changing double-engine-head driving system

Abstract

The invention discloses an electromobile three-gear speed changing double-engine-head driving system. A third-gear gear (4) is provided with a two-stage reduction driving gear (14) and meshed with two input gears (21) at the same time, each input gear (21) corresponds to one motor (22), a transmission shaft sleeve (3) is connected with an output spline housing (5), a second-gear gear (7) and a first-gear gear (6) are arranged in the middle of the transmission shaft sleeve (3) side by side in a freely-sleeved mode, and a double-pawl sliding sleeve (8) is arranged between the second-gear gear (7) and the two-stage reduction driving gear (14). According to the electromobile three-gear speed changing double-engine-head driving system, a stepping motor works when gear shifting is carried out, and the energy can be effectively saved. When the electromobile three-gear speed changing double-engine-head driving system works at a high speed, as only first-stage reduction exists, the efficiency point is higher than that of a traditional gear shifting motor, gear shifting can be rapidly conveniently and stably achieved, and large impact force caused when the gear shifting is carried out can be avoided. The weight of a whole electromobile is borne by a main shaft, the assembly difficulty is reduced, the assembly accuracy is reduced, and a motor shaft can be effectively prevented from being broken.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a three-speed variable-speed dual-head driving system on an electric vehicle. Background technique [0002] At present, the transmission mechanism of electric vehicles generally adopts two-speed transmission, and the existing shortcomings are: [0003] 1) The reduction ratio span between each gear is large, and the reduction ratio is about 2; when the reduction ratio span is too large, there will be a large impact force when shifting gears, resulting in the instantaneous maximum current, which is easy to cause damage to the control system. [0004] 2) The two-speed transmission mechanism transmits power through the shaft. The shaft must bear both torque and weight. Therefore, the installation accuracy of the shaft is quite high, and a slight deviation will cause the motor shaft to break. [0005] 3) The two-speed transmission mechanism has a three-stage dec...

AI Technical Summary

Problems solved by technology

[0003] 1) The reduction ratio span between each gear is large, and the reduction ratio is about 2; when the reduction ratio span is too large, there will be a large impact force when shifting gears, resulting in the instantaneous maximum current, which is easy to cause damage to the control system

[0004] 2) The two-speed transmission mechanism transmits power through the shaft, and the shaft must bear both torque and weight, so the installation accuracy of the shaft is quite high, and a slight deviation will cause the motor shaft to break

[0005] 3) The two-speed transmission mechanism is a three-stage deceleration regardless of the high-speed gear or the low-speed gear, and it is difficult to achieve the best efficiency point (output power divided by input power) during high-speed operation

[0006] 4) It needs to be equipped with a high-power motor, which not only increases the cost, but also increases the volume of the entire drive system, and the heat generated by the motor is large, which will affect the reliability of the system

[0007] 5) The shifting is controlled by the electromagnet, since the electromagnet will work all the time, this will inevitably cause energy waste

Images