【摘要】 采用自行研制的径向轴承微载荷摩擦试验机研究了微载荷下径向含油轴承的摩擦性能,采用小波方法对试验数据进行滤波降噪.结果表明,含油轴承在稳定微载荷状态下的瞬态摩擦系数不固定,且随着润滑剂、轴承转速、径向载荷与混合润滑状态等因素而变化.在微载荷状态下,当600 r/m in、采用液晶添加剂(5CB)与46号机械油以体积比1%~2%配制的润滑剂润滑时,平均摩擦系数达到最小值;当转速从600 r/m in增至3 000 r/m in时,平均摩擦系数由小变大、再变小;瞬态摩擦系数随着载荷从0.5 N增至10.0 N呈现高-低-稳定的变化趋势.与混合润滑状态相比,充分润滑下的摩擦系数较大;当混合润滑时,在主轴转速为1 500~2 400 r/m in下的摩擦系数出现不稳定.更多还原

【Abstract】 Performance and tribological character of journal porous bearings under micro-load were studied.The test results were obtained with wavelet signal process.Results show that instantaneous friction coefficient does not keep constant even under steady exterior micro-load due to tribo-structure and manufacture error,and it varies with operation condition such as type of lubricants,rotation speed of shaft,exterior load and oil starvation state.Under micro-load state and with shaft rotation speed 600,1%~2% volume ratio of liquid crystal to 46~# machinery oil yields the lowest friction coefficient.The friction coefficient shows a parabola curve of low-high-low with the shaft rotate speed rising form 600~3 000.Instantaneous friction coefficient shows a tendency of high-low-stable with the increase of exterior load from 0.5 to 10.Compared with starved lubrication,the flood lubrication displays a higher friction coefficient.Mixed lubrication may result in unsteady state as shaft rotation speed is higher than 1 500~2 400.更多还原