tailieunhanh - Lubrication and Reliability Handbook 2010 Part 3

Tham khảo tài liệu 'lubrication and reliability handbook 2010 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A7 Plain bearing lubrication Table Resistance to corrosion of bearing metals Maximum operating temperature C Additive or contaminant Extreme-pressure additive Antioxidant Weak organic acids Strong mineral acids Synthetic oil Lead-base white metal 130 Good Good Moderate poor Fair Good Tin-base white metal 130 Good Good Excellent Very good Good Copper-lead without overlay 170 Good Good Poor Fair Good Lead-bronze without overlay 180 Good with good quality bronze Good Poor Moderate Good Aluminium-tin alloy 170 Good Good Good Fair Good Silver 180 Sulphur-containing additives must not be used Good Good except tor sulphur Moderate Good Phosphor-bronze 220 Depends on quality of bronze. Sulphurised additives can intensify corrosion Good Fair Fair Good Copper-lead or lead-bronze with suitable overlay 170 Good Good Good Moderate Good Note corrosion of bearing metals is a complex subject. The above offers a general guide. Special care is required with extreme-pressure lubricants if in doubt refer to bearing or lubricants supplier. 10 0 10 20 30 40 50 60 70 80 90100110 Temperature C Figure Typical viscosity temperature characteristics of mineral oils Bearing temperature Lubricant supply rate should be sufficient to restrict the temperature rise through the bearing to less than 20 C. A working estimate of the mean bearing temperature Vbarrng is given by bsaring supply 20 C Dynamic and Kinematic Viscosity Dynamic Viscosity T cP Density Kinematic Viscosity cSt Viscosity classification grades are usually expressed in terms of Kinematic Viscosities. Plain bearing lubrication A7 At moderate speeds oil holes may be substituted if l d does not exceed 1. Note the load-carrying capacity of bearings with circumferential grooves is somewhat lower than with axial grooves owing to the effect of the groove on pressure generation. Figure Oil grooves in journal bearings A8 Rolling bearing lubrication SELECTION OF THE LUBRICANT Table General guide for choosing between .

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