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Oil lubrication
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For lubricating oils, viscosity is one of the most important properties and determines an oil’s lubri- cating efficiency. If viscosity is too low, formation of the oil film will be insufficient, and damage will occur to the load carrying surfaces of the bearing. If viscosity is too high, viscous resistance will also be great and result intemperature increases and friction loss. In general, for higher speed applicati- ons lower viscosity oil should be used; for heavier load applications, higher viscosity oil should be used. In regard to operating temperature and lubrication, the left chart shows an oil viscosity operating temperature comparison for the purpose of selecting a lubrication oil with viscosity characteristics appropriate to an application. |
Examples of Selection Lubricating Oils
|
Operating Temperature |
Speed | Light or normal Load | Heavy or Shock Load |
| -30 to 0°C | Less than limiting speed |
ISO VG 15, 22, 32 (refrigerating machine oil) |
- |
| 0 to 50°C |
Less than 50% of limiting speed 50 to 100% of limiting speed More than limiting speed |
ISO VG 32, 46, 68 (bearing oil, turbine oil) ISO VG 15, 22, 32 (bearing oil, turbine oil) ISO VG 10, 15, 22 (bearing oil) |
ISO VG 46, 68, 100 |
| 50 to 80°C |
Less than 50% of limiting speed 50 to 100% of limiting speed More than limiting speed |
ISO VG 100, 150, 220 (bearings oil) ISO VG 46, 68, 100 (bearing oil, turbine oil) ISO VG 32, 46, 68 (bearing oil, turbine oil) |
ISO VG 150, 220, 320 |
| 80 to 110°C |
Less than 50% of limiting speed 50 to 100% of limiting speed More than limiting speed |
ISO VG 320, 460 (bearing oil) ISO VG 150, 220 (bearing oil) ISO VG 68, 100 (bearing oil, turbine oil) |
ISO VG 460, 680 (bearing oil, gear oil) ISO VG 220, 320 (bearing oil) |
Note: If the operating temperature is near the high end of the temperature range listed in the left column, select high viscosity oil.
