Three-gear variable speed transmission mechanism of electrocar

Abstract

The invention discloses a three-gear variable speed transmission mechanism of an electrocar. A transmission sleeve (3) sleeves a spindle hollowly, a three-gear gear (4) sleeves on the periphery of one end of the transmission sleeve (3) hollowly, a two-grade driving reduction gear (14) is arranged on the three-gear gear (4), the other end of the transmission sleeve (3) is connected with an output spline sleeve (5), a two-gear gear (7) and a one-gear gear (6) sleeve a middle portion of the transmission sleeve (3) side by side hollowly, a double-pawl sliding sleeve (8) is arranged between the two-gear gear (7) and the two-grade driving reduction gear (14), and a single-pawl sliding sleeve (9) is arranged between the one-gear gear (6) and the output spline sleeve (5). When the three-gear variable speed transmission mechanism runs at a high speed, efficiency of the three-gear variable speed transmission mechanism is higher than that of other gear-shifting motors since only one reduction grade is provided, gear shifting is convenient and stable, and large impact force during gear shifting can be avoided. The spindle bears the overall weight of the electrocar, so that assembling difficulty and precision are lowered, and fracture of a motor shaft can be avoided effectively.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a three-speed 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. 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 deceleration regardl...

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

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