Method for determining assembly interference magnitude and heat preservation point of motor stator

Abstract

The invention discloses a method for determining assembly interference magnitude and heat preservation points of a hybrid motor stator, which comprises the following steps of: firstly, calculating an assembly working condition and a working condition (after temperature rise) to obtain data such as deformation of a motor shell and a gearbox shell, stress dependent variables of all parts, bonding pressure between the motor stator shells and the like; and carrying out evaluation according to judgment standards such as transmission torque, stress strain and maximum deformation to obtain an optimal value range of the motor stator assembly interference, carrying out statistical analysis and data fitting on the motor shell deformation along with the temperature change trend to obtain a heat preservation point change curve and a fitting function, and providing reference for final scheme design. The value result calculated by the method is clearer and more efficient, the product design and development period can be remarkably shortened, the development cost can be saved, and the method can be effectively used for product assembly process design.

Description

technical field [0001] The invention relates to the technical field of automobile assembly, in particular to the technology of the assembly interference amount and heat preservation point of a hybrid motor stator. Background technique [0002] At present, the stator and housing of some hybrid electric motors on the market adopt interference fit to transmit torque. Since a certain amount of interference is set between the motor stator and the motor housing, the In the process, the motor shell needs to be heated to a certain temperature point. At this time, the thermal expansion of the shell assembly surface is greater than the interference, so as to complete the assembly. This corresponding temperature is called the heat preservation point. If the definition of interference is too large, the motor housing is deformed outward by the force generated by the interference fit, resulting in a larger diameter, which often makes it difficult or impossible to fit the assembly composed...

AI Technical Summary

Problems solved by technology

[0003] The traditional interference fit is calculated based on GB / T5371-2004 "Calculation and Selection of Limit and Fit Interference Fit", but it does not consider the uneven distribution of structural stiffness, contact nonlinearity and Due to the influence of factors such as material parameters changing dynamically with temperature, the calculation results have certain deviations in guiding the practical application.

Generally speaking, the motor housing is generally not an ideal cylindrical structure, and the radial deformation varies at different positions and angles. It is impossible to calculate the accurate deformation distribution and joint surface pressure distribution results through empirical formulas.

When the interference amount is not properly selected, it will often lead to excessive deformation or small load-bearing torque, and the optimization plan needs to be adjusted repeatedly in the follow-up, which consumes a lot of cost and time to improve

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