Method for cooling motor by using lubricating oil in two-in-one electric drive assembly

Abstract

The invention discloses a method for cooling a motor by using lubricating oil in a two-in-one electric drive assembly, which is characterized in that the lubricating oil in a planetary reducer is in contact with a shell of the motor and flows on the surface of the shell, so that the lubricating oil absorbs heat of a stator and a rotor through the shell of the motor, and the motor is cooled. According to the method, the idle supporting seat cavity of the two-in-one electric drive assembly is utilized, the front section of the motor where the rotor is located is arranged in the supporting seat cavity, the inner wall of the rear end of the supporting seat cavity and the periphery of the shell are sealed, and the output shaft of the motor and the inner wall of the shaft hole in the shell are sealed. And lubricating oil in the speed reducer cavity flows through the supporting seat cavity. The advantages are that the motor temperature rise can be effectively controlled when the motor load is suddenly increased; the total length of the two-in-one electric drive assembly is obviously shortened, and the installation space needed by the two-in-one electric drive assembly is reduced.

Description

technical field [0001] The invention relates to cooling of a motor in an electric drive assembly of construction machinery, in particular to a method for cooling a motor with lubricating oil in a two-in-one electric drive assembly, and belongs to the technical field of drive assembly of construction machinery. Background technique [0002] Construction machinery two-in-one electric drive assembly is a combination of motor and planetary reducer. [0003] The traditional two-in-one electric drive assembly installs the motor at one end of the planetary reducer, the motor body is exposed, and the outer periphery of the casing has a heat dissipation structure, that is, the motor naturally dissipates heat in the air. The effect of natural heat dissipation of the motor in the air is not only affected by the change of ambient temperature, but also by the size of the load, especially when the load suddenly increases, the motor will heat up rapidly in a short time. Although the durat...

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Problems solved by technology

Although the duration of this rapid temperature rise in a short period of time is not very long, it has a great adverse effect on the motor. First, it will cause demagnetization of the rotor to varying degrees, and repeated high temperatures for a long time will lead to power drop.

Second, it will accelerate the aging of the coil insulation material and affect the service life of the motor

However, due to the small diameter of the rotor shaft and the small diameter of the flow passage, the heat that the lubricating oil can take away is limited. When the load suddenly increases and the motor heats up rapidly in a short period of time, the cooling effect is not obvious.

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