Lubrication
Lubrication
Figure A
Figure B
Nominal lubricant viscosity can be determined based on the required viscosity, νk, the steady state temperature of the roller screw using the viscosity-temperature diagram in figure B, and the operating temperature of the roller screw system. Nominal viscosity is the viscosity of the lubricant at 40°C. Viscosity classes consistent with ISO VG (DIN 51517), Part 2, are plotted in figure B. The operating temperature of the roller screw must be known or estimated to calculate the required nominal viscosity using this technique.Grease Lubrication:Grease is the most common form of lubrication for CMC roller screws, and provides an effective solution for most applications. The required viscosity in the case of grease lubrication can be calculated using the same process outlined above for oil viscosity determination. The viscosity of grease is rated with ISO VG levels just as oils and this information is typically provided by grease manufacturers. Re-greasing intervals depend on the screw arrangement, size and operating conditions.
Figure A
Figure B
Nominal lubricant viscosity can be determined based on the required viscosity, νk, the steady state temperature of the roller screw using the viscosity-temperature diagram in figure B, and the operating temperature of the roller screw system. Nominal viscosity is the viscosity of the lubricant at 40°C. Viscosity classes consistent with ISO VG (DIN 51517), Part 2, are plotted in figure B. The operating temperature of the roller screw must be known or estimated to calculate the required nominal viscosity using this technique.
Grease Lubrication:
Grease is the most common form of lubrication for CMC roller screws, and provides an effective solution for most applications. The required viscosity in the case of grease lubrication can be calculated using the same process outlined above for oil viscosity determination. The viscosity of grease is rated with ISO VG levels just as oils and this information is typically provided by grease manufacturers. Re-greasing intervals depend on the screw arrangement, size and operating conditions.