德国力士乐公司为长期工作在高压环境下而设计的一种重载荷超长寿命泵，SL型号的泵是采用带静压平衡超长寿命重载轴承，与标准型号泵相比，“SL”型号泵有较长的使用寿命，泵可长期在高压状态下工作。在31.5MPa,公称转数和油液粘度36m㎡/s下软寿命为10，000h小时。此泵设有专用于冲洗轴承的U油口。泵用轴承基本额定寿命是指足够大一组的相同型号轴承中有90%在出现疲劳征兆前达到或超过的寿命。额定寿命计算的基础与ISO281一致，是Lundberg和Palmgren的疲劳理论,该理论考虑了很多因素，包括材料的疲劳极限，润滑，载荷与润滑间隙内的相互关系以及轴承的摩擦特性和载荷分布。
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