Compact central drive type self-adaptive electric drive assembly with ultra-large load

Abstract

The invention discloses a compact central drive type self-adaptive electric drive assembly with an ultra-large load. The electric drive assembly comprises a rotating output part, a power system and aspeed-changing system. A first box body and a second box body are arranged on the two sides of the rotating output part respectively; the power system, a power input mechanism and a high-speed gear transmission mechanism are installed in the first box body and a low-speed gear transmission mechanism is installed in the second box body; a main shaft and a main transmission sleeve are arranged on the rotating output part in a communicating mode. The high-speed gear transmission mechanism includes a multi-piece friction clutch and an elastic element set. According to the technical scheme, becauseof a newly-designed central driving type structure, the assembly has the advantages of a hub motor and a side hanging type structure at the same time; the internal space of the motor is fully utilized, so that the structure is very compact, and the integration degree is high; besides, the friction structure of the multi-piece friction clutch is provided with a plurality of outer friction pieces and inner friction pieces which are arranged alternately, so that the borne torque is dispersed on the outer friction pieces and the inner friction pieces, and the sliding friction loss is greatly reduced.

Description

Technical field [0001] The invention relates to the technical field of electric drive systems, in particular to a compact central drive self-adaptive electric drive assembly with super large load. Background technique [0002] With the increasingly stringent environmental regulations, it is a general trend that new energy vehicles represented by pure electric vehicles, two-wheeled vehicles, and tricycles will replace traditional fuel vehicles. The existing two-wheeled electric vehicles generally adopt a hub motor and a side-mounted motor structure. [0003] The wheel hub motor is directly driven by a low-speed DC motor, which not only has relatively low efficiency and large 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 the control performance and safety. The side-mounted structure places the motor and the transmission system (gearbox or reducer) on the same side ...

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

[0005] Moreover, the existing friction clutches are mainly disk-type friction clutches including active friction discs and driven friction discs, which have poor wear resistance, and their sensitivity, stability and reliability will drop significantly after long-term use. The defect of short life cannot be used as a high-torque power transmission device

[0006] Moreover, the traditional electric drive assembly is composed of mutually independent power system and transmission system, not only the transmission efficiency is not high enough, but also affects the layout of the mechanism, and the volume is relatively large

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