Pure electric vehicle and powertrain system

Abstract

The invention provides a pure electric vehicle and a powertrain system, comprising a housing, an electric motor, a first planetary row, a transmission mechanism and a control shifting device. A firstplanetary row includes three first rotating elements, one of the three first rotating elements controls the shifting device and the housing, the output shaft of the motor is connected to control the selective operation of the shifting device so as to realize braking or rotation, and the other two of the three first rotating elements are respectively connected with the output shaft of the motor andthe input ends of the transmission mechanism one by one; The output end of the transmission mechanism is used for driving and connecting to the wheel end of the automobile. The transmission mechanismhas a two-step ratio of less than 2, so that the torque demand of the motor can be reduced and the output torque of the wheel end of the automobile can be increased, and the ride comfort of the vehicle can be ensured; moreover, the whole structure of the transmission mechanism is compact, the integration level is high, the control is simple and the cost is low.

Description

Technical field [0001] The present invention relates to the field of automobile technology, in particular to a pure electric automobile and a powertrain system. Background technique [0002] With the increasing awareness of environmental protection, the development and utilization of new energy has become more and more important and popular. As an important part of environmental protection, the automotive industry needs to design and develop new energy pure electric vehicles in accordance with the times. What comes is the change and update of the transmission system of new energy pure electric vehicles. The transmission work of the powertrain system of traditional pure electric vehicles is generally realized by a parallel-offset two-stage involute helical gear structure with a fixed speed ratio. With this structure, if a larger wheel-end torque output is required, , It is necessary to increase the torque output of the motor or increase the transmission ratio, but increasing the ...

AI Technical Summary

Problems solved by technology

The transmission work of the powertrain system of a traditional pure electric vehicle is generally realized through a parallel offset two-stage involute helical gear structure with a fixed speed ratio. With this structure, if a larger wheel end torque output is required , it is necessary to increase the torque output of the motor or increase the transmission ratio, but increasing the torque output of the motor will increase the volume of the motor, thereby increasing the cost; and increasing the transmission ratio will require the overall layout of the transmission structure of the powertrain system Higher, and the transmission structure with a fixed speed ratio makes it difficult for the powertrain system to balance acceleration and economy, and the use effect is poor

[0003] The current two-speed transmission structure scheme includes fixed shaft type and planetary gear type. Due to the large demand for speed ratio of the powertrain system, the overall layout of the fixed shaft type is difficult to meet the requirements; and the two-speed type of single planetary gear mechanism The order ratio is greater than 2, which makes it difficult to ensure the ride comfort of the vehicle

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