Axial fixing mechanism of motor rotor bearing

Abstract

The invention relates to an axial fixing mechanism of a motor rotor bearing. The axial fixing mechanism relates to the technical field of motor rotor bearing assembly. According to the axial fixing mechanism of the motor rotor bearing, a motor comprises a casing, a stator assembly and a rotor assembly, the axial fixing mechanism comprises a bearing pressing plate arranged on a rear end cover, theside surface of the bearing pressing plate is provided with two positioning plates used for positioning the bearing pressing plate, the side surface of the bearing pressing plate is further provided with at least three fixing plates, and the positioning plates and the fixing plates are bent in a direction away from the rotor assembly. The axial fixing mechanism of the motor rotor bearing shortensthe axial size of the motor as much as possible on the premise of satisfying the conditions that a bearing is fixed axially with one end floating and one end fixed, such that the structure is more compact and reliably, and the design of the positioning plates can enable the axial fixation of the motor rotor bearing to satisfy automatic assembly.

Description

technical field [0001] The invention relates to the technical field of motor rotor bearing assembly, in particular to an axial fixing mechanism of a motor rotor bearing. Background technique [0002] The motor rotor is the rotating part in the motor. The motor consists of two parts, the rotor and the stator, and it is a device used to realize the mutual conversion of electrical energy and mechanical energy. The motor rotor is divided into a motor rotor and a generator rotor. The rotor bearing of the motor is an important part of the motor rotor, and the installation accuracy of the rotor bearing directly affects the service life, production cost and efficiency of the motor. The maximum external dimension of the motor is finalized after the electromagnetic scheme is determined, and the axial dimension of the motor should be shortened as much as possible under the premise of ensuring a safe distance. The motor rotor assembly is assembled inside the casing and needs to be ax...

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Problems solved by technology

[0003] In the existing technology, the axial fixing method of the rotor bearing of the motor adopts the positioning of the hole with the circlip. First, because there must be an assembly gap between the circlip and the circlip groove in the axial direction when the circlip is assembled, the matching error of the stator and rotor is increased; secondly, the assembly method, after the bearing is assembled, both ends are floating, which leads to the phenomenon that the bearing runs out of the outer ring when the motor is running; again, when the circlip is used for assembly, the motor bearing chamber needs to process the corresponding circlip groove, in order to ensure the reliability of the structure, it is necessary to ensure The distance from the groove to the end face of the bearing chamber must also reserve enough assembly guide structure, which increases the axial size of the motor; finally, automatic assembly cannot be realized by using the circlip structure for assembly

In the existing technology, the axial positioning also adopts the assembly method of one end floating and one end fixed, which not only ensures the assembly, but also ensures that the linear expansion of the motor shaft due to thermal expansion and contraction can be released when the motor temperature rises high. However, the axial size of the motor in the existing assembly method is large, which increases the instability of the motor

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