Electric vehicle shift mechanism

Abstract

The invention discloses an electric bicycle gear shifting mechanism. A third-gear gear (4) is hollowly sheathed on the outer periphery of one end of a transmission shaft sleeve (3), a secondary speed reducing driving gear (14) is arranged on the third-gear gear (4), the other end of the transmission shaft sleeve (3) is connected with an output spline sleeve (5), a two-gear gear (7) and a one-gear gear (6) are hollowly sheathed side by side in the middle of the transmission shaft sleeve (3), a double-pallet sliding sleeve (8) is arranged between the two-gear gear (7) and the secondary speed reducing driving gear (14) and is connected with a pulling fork (16), and the pulling force (16) is driven through a gear pair by a step motor (17). The electric bicycle gear shifting mechanism has the advantages that the step motor only works during the gear shifting, energy sources can be effectively saved; during high-speed operation, only primary speed regulation is realized, so the efficiency can be higher than that of conventional gear shifting motors, in addition, the gear shifting is convenient, fast and stable, and the occurrence of greater impact force during the gear shifting can be avoided; the weight of the whole bicycle of an electric bicycle is totally born on a main shaft, the difficulty and the precision of the assembly can be reduced, and the fracture of a motor shaft can also be effectively prevented.

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. 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 regardless of...

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

Images