A motor rotor cooling system for an electric drive assembly

Abstract

The invention discloses a motor rotor cooling system for an electric drive assembly, comprising a pump, an oil pan, a motor rotor and a hollow input shaft of a reducer. Submerged in the oil pan, the oil outlet of the pump is sealed with the hollow input shaft of the reducer, the hollow input shaft of the reducer is inserted into the inner hole of the hollow shaft of the motor, and the hollow input shaft of the reducer and the hollow shaft of the motor are connected by a spline structure. There are oil passages inside the laminated iron core of the rotor of the motor. The hollow shaft of the motor is respectively provided with a front oil outlet and a rear oil return port which communicate with the oil passages. The front oil outlet is connected to one end of the hollow input shaft of the reducer, and the rear row The oil return port is communicated with the oil pan through the gap between the hollow rotating shaft of the motor and the hollow input shaft of the reducer, and the spline structure in turn; the invention increases the heat exchange area between the cooling liquid and the motor rotor through the built-in cooling liquid circuit, and greatly improves the cooling effect. Efficiency, efficient coolant circulation.

Description

technical field [0001] The invention relates to a cooling system for an electric drive assembly of a new energy vehicle, in particular to a motor rotor cooling system for an electric drive assembly. Background technique [0002] Under the development theme of energy conservation and environmental protection, the state has issued many support policies for new energy vehicles, and new energy vehicle technologies continue to be updated iteratively. Power is delivered more efficiently, and the cooling performance of the powertrain is more challenging. At present, the motor cooling system of the electric drive assembly is mainly aimed at the motor stator, and the thermal management of the motor rotor will become an important topic of motor cooling. The motor will generate a lot of heat under extreme conditions such as maintaining the car ramp, starting and accelerating rapidly. If the temperature control is unreasonable, it will directly affect the output power, insulation perfo...

AI Technical Summary

Problems solved by technology

This solution adopts the form of an external coolant circuit, which needs to be installed and fixed, which takes up a large space, which is not conducive to the integrated design of the electric drive assembly; The liquid heat exchange area is small and the cooling effect is insufficient

Images