Electric vehicle gear shifting mechanism

Abstract

The invention discloses an electric vehicle gear shifting mechanism. The periphery of one end of a transmission shaft sleeve (3) is sleeved with a third-gear gear (4) in a spaced manner; the third-gear gear (4) is provided with a two-stage speed reducing driving gear (14); the other end of the transmission shaft sleeve (3) is connected with an output spline sleeve (5); the middle portion of the transmission shaft sleeve (3) is sleeved with a second-gear gear (7) and a first-gear gear (6) side by side in a spaced manner; a double-pawl sliding sleeve (8) is arranged between the second-gear gear(7) and the second-stage speed reducing driving gear (14), and is connected with a shifting fork (16); and the shifting fork (16) is driven by a stepping motor (17) through a gear pair. During gear shifting of the electric vehicle gear shifting mechanism, the stepping motor can work, and energy can be effectively saved; during high-speed running of the electric vehicle gear shifting mechanism, only first-stage speed reducing is performed, and therefore the efficiency point is higher than that of a traditional gear shifting motor, gear shifting is convenient, fast and steady, and large impacting force during gear shifting can be avoided; and the weight of a whole electric vehicle is wholly borne on a main shaft, the assembling difficulty and precision are reduced, and it can also be prevented that a motor shaft is broken.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a shift transmission mechanism 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, and 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 is three-stage deceleration regardless o...

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. 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 is three-stage deceleration regardless of high-speed gear or 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) The shifting is controlled by the electromagnet, since the electromagnet will work all the time, this will inevitably cause energy waste

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