Coaxial self-adaptive electric drive assembly adopting central drive mode

Abstract

The invention discloses a coaxial self-adaptive electric drive assembly adopting a central drive mode. The coaxial self-adaptive electric drive assembly comprises a rotary output part, a motor and a speed-changing system. A first box body and a second box body are arranged on the two sides of the rotary output part. A main shaft and a main transmission sleeve are arranged on the rotary output partin a communicating mode, the two ends of the main shaft and the main transmission sleeve are inserted into the first box body and the second box body respectively, and the motor is installed outsidethe first box body; and a motor shaft of the motor is connected with the main shaft through a coupling assembly after being inserted into the first box body. According to the technical scheme, on thebasis of a newly-designed central driving type structure, the assembly has advantages of a hub motor and a side hanging type structure; the internal space of the motor is fully utilized, the structureis very compact, and the integration degree is high; the actual driving working condition and the motor working condition of the pure electric vehicle can be matched in a self-adaptive mode, so thatthe efficiency of the motor under the climbing and heavy load conditions is greatly improved; and with an external motor installation mode, heat dissipation of the motor is facilitated, and maintenance, overhaul and replacement of the motor are facilitated.

Description

technical field [0001] The invention relates to the technical field of electric drive systems, in particular to a coaxial self-adaptive electric drive assembly in the form of a central drive. Background technique [0002] With the increasingly stringent environmental protection regulations, it is a general trend that new energy vehicles represented by pure electric vehicles, two-wheelers, and tricycles will replace traditional fuel vehicles. Existing two-wheeled electric vehicles generally adopt hub motors and motor side-mounted structures. [0003] The hub motor is directly driven by a low-speed DC motor, which not only has relatively low efficiency and high heat generation, but also breaks the original balance of the wheel structure due to the large size and heavy weight of the motor, which will have a certain impact on handling performance and safety. The side-mounted structure puts the motor and the transmission system (gearbox or reducer) on the same side of the drivin...

AI Technical Summary

Problems solved by technology

[0003] The hub motor is directly driven by a low-speed DC motor, which not only has relatively low efficiency and high heat generation, but also breaks the original balance of the wheel structure due to the large size and heavy weight of the motor, which will have a certain impact on handling performance and safety.

The side-mounted structure puts the motor and the transmission system (gearbox or reducer) on the same side of the driving wheel. Although a high-speed motor can be used to improve mechanical efficiency, the weight of the transmission mechanism and the motor is heavy, resulting in unbalanced wheels. Good, especially for two-wheelers

[0004] Due to the limitations of its transmission structure, the existing electric vehicles are completely controlled by the driver based on experience when the driving resistance cannot be accurately known during driving. The actual driving conditions do not match, causing the motor to stall

Especially when the vehicle is under low-speed and heavy-load conditions such as starting, climbing, and headwind, the motor often needs to work at low efficiency, low speed, and high torque, which is likely to cause accidental damage to the motor and increase maintenance and replacement costs. directly affect the battery life

For models with high economic requirements such as electric logistics vehicles, the traditional variable speed transmission structure obviously cannot better meet their use requirements

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