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根据轴承选择具有很大模糊性这一特点，运用模糊理论中的贴近度原理，把丰收系列拖拉机变速箱轴承的类型选择问题看成是一种模糊模式识别，通过确定工况对轴承“承受径向力的能力”等９个功能评价指标的具体要求，计算出各类型轴承对工况的贴近度，进而由贴近度的最大值选择出与工况最吻合的角接触球轴承。该方法还适用于其他类型的拖拉机及类似车辆。
According to the characteristics of bearing selection with great ambiguity, using the principle of closeness in fuzzy theory, the type selection of harvesting tractor gearbox bearings is regarded as a kind of fuzzy pattern recognition. By determining the working conditions, To the ability of force "and other nine functional evaluation indicators of the specific requirements, calculate the type of bearing close to the working conditions, and then close to the maximum value to choose the most consistent with the conditions of angular contact ball bearings. The method is also applicable to other types of tractors and similar vehicles.