球头座为向心关节轴承的外圈，由锌基合金制成。
Ball joint housing is an outer ring of radial spherical plain bearing, made of zinc base alloy.
向心关节轴承在承受载荷时，承载区各点的压应力是不等值的。
When absorbing load, various loaded points of plain radial bearing receive different compressive stresses.
该节点由向心关节轴承、销轴、铸钢件等部分组成，构造复杂，无法用常规方法确定其承载力。
This joint is composed of a RSPB, a pin shaft and steel castings, which is too complicated to be analyzed by traditional methods.
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