Interference fit structure and method

Abstract

The invention relates to an interference fit structure and method. Specifically, the structure comprises a first cylindrical part and a second cylindrical part, wherein the first and second parts extend along central axes. The axial length of the second part is greater than the axial length of the first part, and the first part is disposed in the second part through the technology of interference fit. A part, outside of the first part, of the second part is provided with at least two grooves along the central axis, wherein each groove extends in the radial direction of the second part. The first groove is opened towards a radial inner side of the second part, and the second groove is opened towards a radial outer side of the second part. In addition, the invention also provides a related interference fit method. According to the invention, the structure and method can reduce the deformation caused in the process of interference fit.

Description

technical field [0001] The present invention relates to an interference fit structure, especially an interference fit structure applicable to electric motors; and the present invention also relates to a method for interference fitting a cylindrical second part to a cylindrical first part method. Background technique [0002] In the mechanical field, the interference fit process is widely used in the assembly process of an outer part and an inner part passing through the outer part. In particular, currently, the interference fit process is widely used in the assembly process of the power transmission system of the electric motor. For example, the interference fit process may be applied to assembling the stator of the electric motor and the cooling water jacket of the electric motor; or may be applied to assembling the rotor hub of the electric motor and the rotor of the electric motor. An interference fit process known in the art is to cool the inner part to a very low temp...

AI Technical Summary

Problems solved by technology

[0006] 1. It requires an additional machining step;

[0007] 2. In the case of assembling the stator of the motor, the winding head of the stator is likely to be damaged during the machining process of the stator-related structure;

[0008] 3. In the case of assembling the rotor of the motor, because the rotor usually has a magnet with a strong magnetic field, it is difficult for ordinary machines to adapt to the strong magnetic field environment, so it is difficult to perform machining;

[0009] 4. The above three points make the manufacturing cost of additional machining very high

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