Two-gear coaxial electric drive system

Abstract

The invention discloses a two-gear coaxial electric drive system which comprises a driving motor, a motor output shaft, a motor output gear, a duplicate gear large gear, a duplicate gear small gear, aclutch, a brake, a planet carrier and a differential case. The system comprises a set of duplicate gear and a set of single-row planetary mechanism. The rotating speed of a motor can be reduced through the duplicate gear, and the situation in which the high rotating speed of the high-speed motor is directly transmitted to the clutch so that early failure or unstable work of the clutch is caused is prevented. The rear planetary mechanism is connected with the brake and the clutch at the same time, and two gears can be achieved by controlling the closing of the clutch and the brake. The planetary mechanism is adopted, the speed ratio adjusting range of the first gear is large, larger torque can be output, the torque requirement of the driving motor can be reduced accordingly, the size and the weight of the driving motor can be reduced accordingly, and the purpose of reducing cost can be achieved. The system is free of power interruption during gear shifting and has excellent driving comfort.

Description

technical field [0001] The invention relates to the related field of pure electric vehicle electric drive, in particular to a two-speed coaxial electric drive system. Background technique [0002] Pure electric vehicles refer to vehicles powered by vehicle-mounted power supplies and driven by motors to drive wheels, which meet the requirements of road traffic and safety regulations. Due to their smaller impact on the environment than traditional vehicles, their prospects are widely optimistic, but the current technology is not yet Mature. At present, the existing electric vehicles on the market basically use a single-stage reducer with a fixed speed ratio. The use of a single-stage reducer can basically meet the general driving requirements. However, only a single-stage reducer cannot meet both low-speed and large torque. The requirement of higher vehicle speed often leads to the reduction of the driving force of the vehicle at low speed, and the ideal maximum speed cannot b...

AI Technical Summary

Problems solved by technology

[0002] Pure electric vehicles refer to vehicles powered by vehicle-mounted power supplies and driven by motors to drive wheels, which meet the requirements of road traffic and safety regulations. Due to their smaller impact on the environment than traditional vehicles, their prospects are widely optimistic, but the current technology is not yet Mature. At present, the existing electric vehicles on the market basically use a single-stage reducer with a fixed speed ratio. The use of a single-stage reducer can basically meet the general driving requirements. However, only a single-stage reducer cannot meet both low-speed and large torque. The requirement of higher vehicle speed often leads to the reduction of the driving force of the vehicle at low speed, and the ideal maximum speed cannot be reached. For high-performance pure electric vehicles, this problem is particularly prominent. In order to solve this problem, a larger power / torque is usually used The motor can meet the high-speed performance and acceleration performance of the vehicle at the same time. For example, one of the reasons why the existing high-performance electric vehicles use dual motors; however, the larger drive motor means that the high-efficiency area of ​​the motor may be farther away from the operating area corresponding to daily driving. Reduced vehicle economy

[0003] At present, the existing two-speed reducer on the market, due to the power interruption problem, seriously affects the driving comfort, and is not matched with the pure electric passenger car, only matched with the hybrid model and does not have high requirements for driving comfort. For pure electric commercial vehicles or buses, the dual-clutch two-speed reducer cannot directly match the high-speed motor (speed>10000r / min) due to the direct connection between the motor and the clutch.

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