Hydraulic control reducer with neutral position for drive motor of electric vehicle

Abstract

The invention discloses a hydraulic control reducer with a neutral position for a drive motor of an electric vehicle, belonging to a power transmission system of an electric vehicle. The reducer and a motor are integrated into a whole, the shaft of the motor and the input shaft of the reducer are connected with each other at the front end of the motor, and a driving pinion on the input shaft of the reducer is in slip connection with the input shaft of the reducer through a spline; when the vehicle quickly moves under a non-traction working condition, the vehicle is in a two-wheel drive state, and at this time, the front axle is positioned in high gear and the rear axle is in an off-gear state; if the rear axle does not have the off-gear function, the drive motor can be subject to overspeed rotation which may cause damage to the motor. The invention has the advantage of compact structure, overcomes the defects in the quick movement of the vehicle under a non-traction condition and improves the efficiency of the transmission system of the electric vehicle.

Description

technical field [0001] The invention belongs to the power transmission system of an electric vehicle, in particular to a reducer with neutral gear hydraulic control for an electric vehicle drive motor used in the drive of the electric vehicle. Background technique [0002] In the face of increasing environmental and energy pressure, various fields have put forward high requirements for energy saving, emission reduction and low carbon, and high environmental protection standards have also been put forward for the field of ground vehicles. In this environment, electric vehicles have become the key research and development objects of the global automobile industry due to their technical advantages such as energy saving, environmental protection, and sustainable development. [0003] The powertrain of an electric vehicle is an important part of an electric vehicle. The structural design, control method, and transmission efficiency of the electric drive system all have a great i...

AI Technical Summary

Problems solved by technology

Electric vehicles are often required to be designed in such a way that the drive motor can be disconnected from the vehicle transmission system. In addition, especially for four-wheel drive vehicles with motor-driven front and rear axles, when only two-wheel drive is required, it is necessary to The drive motor of one of the axles is disconnected from the axle to improve the efficiency of the drive train of electric vehicles, especially for electric four-wheel drive traction vehicles. The rear axle) has only one single-speed ratio reducer with the same speed ratio as the low speed ratio of the front axle gearbox. In low-speed traction conditions, the front axle transmission is in the low gear state, the rear axle is in the gear state, and the vehicle is in the four-wheel drive state ; When the vehicle is in the non-traction condition and moves quickly, the vehicle is in a two-wheel drive state. At this time, the front axle is in high gear and the rear axle is in a disengaged state. If the rear axle does not have the function of disengaging, its driving motor will Overspeed rotation will occur, possibly causing damage to the motor

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