自由式磨料磨损现象在农业机械、工程机械、煤炭机械、建筑机械等工程领域中广泛存在，是导致这些机械与自由式磨料接触的工作部件的主要失效形式之一。

The phenomena of free abrasive wear widely occur in the working components of agricultural machines, earthmoving machines, coal-mining machines, construction machines and others.

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外球面轴承优先适用于要求设备及零部件简单的场合，例如用于农业机械、运输系统或建筑机械上。

The spherical bearing applies to request priority equipments and parts of the simple situations, such as used for agricultural machinery, transportation system or construction machinery.

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