Hollow shaft, rotor structure, motor and electric automobile

Abstract

The invention provides a hollow shaft, a rotor structure, a motor and an electric automobile. The hollow shaft comprises a shaft body, wherein the shaft body is provided with a shaft cavity with an opening in one end, and the shaft body is further provided with at least one first end oil throwing opening and at least one second end oil throwing opening; and a sleeve piece, which is arranged in theshaft cavity, and in which an oil distribution opening is formed, wherein the outer diameter of the sleeve piece is R2, the inner diameter of the shaft cavity is R1, R1 being larger than R2, and theoil distribution opening is formed between the at least one first end oil throwing opening and the at least one second end oil throwing opening. Flow distribution of oil throwing openings in the frontand rear ends is uniform, so that the cooling temperature difference of the front and rear ends of the hollow shaft is reduced; a plurality of independent oil guide structures are arranged, so that the axial flow velocity of cooling oil is increased, and the oil passing capacity of the hollow shaft is improved; the semi-closed hollow shaft sealing structure prevents the cooling oil from leaking,and meanwhile prevents pressure difference from being formed between the air pressure of the inner cavity and the outside of the oil throwing opening; and a rotor baffle plate is provided with a cooling flow channel with multiple layers of sub-flow channels, so that the cooling effect of the rotor body is improved.

Description

Technical field [0001] The invention belongs to the technical field of motors, and specifically relates to a hollow shaft, a rotor structure, a motor and an electric vehicle. Background technique [0002] The motor of an electric vehicle generates a lot of heat during low-speed and high-torque operation, which increases the temperature of the motor and seriously affects the performance and efficiency of the motor. For high-speed passenger car motors, in a very limited appearance space, it is required to achieve high-speed and high-power performance, which poses new challenges for the heat dissipation of the motor. [0003] Due to the narrow air gap between the rotor and the stator of the permanent magnet motor, the air in the air gap is difficult to flow axially, which makes it difficult to cool the rotor and will cause serious problems of heat generation. This will cause the magnetic steel material on the rotor to be exposed to long-term high temperatures. Loss of magnetism reduc...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is that the flow distribution of the oil throwing port of the hollow shaft is uneven, which affects the cooling effect, thereby providing a hollow shaft, a rotor structure, a motor and an electric vehicle

Images