工程机械常用的液压平衡回路，存在着悬垂负荷再提升下滑和下降冲击、振动的问题。
Several problems exist in the commonly used hydraulic balancing circuits, such as drift in re-lifting of suspended load and shock and Vibration in lowering.
调心滚子轴承承受径向负荷，双向轴向负荷及其合成负荷的能力较大的场合，适合于承受振动，冲击负荷的用途。
Spherical roller bearings are subjected to radial load, bidirectional axial load capacities and synthetic load more, suitable to withstand vibration and shock loads.
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