FreeRun Bearing Co.,Ltd-Technology-LUBRICATION

Technology

LUBRICATION

Lubrication increases bearing life in most operating environments. The positive effects of lubrication may be summarized as follows:

A lubricant film reduces friction and wear between the balls and raceways of the bearing, extending fatigue life.
Dissipates frictional heat and can provide additional cooling if lubricant is circulated.
Guards against corrosion and may help prevent foreign material from entering the bearing.
In addition to these general benefits, a good lubricant should have the following intrinsic properties:

Resists change in structure or consistency during prolonged service.
Resists excessive viscosity changes at temperature extremes.
Resists leakage, dripping or throw-off from rotating surfaces.
Compatibility with materials used in bearings, particularly seals and retainers.
Tolerate some contamination, including moisture, without loss of characteristics.
Other factors that are affected by lubricant choice include:

Noise level
Maximum operating speed
Torque
Storage time (shelf life)

LUBRICANT TYPES

Grease: Grease lubricant is comprised of a base oil carried in a thickening agent, which delays migration and evaporation of the oil, lengthening its effective operational and shelf life. Additives may also be included in the basic grease formula to improve corrosion resistance, reduce oxidation, and otherwise improve the lubricant performance. Grease lubrication is recommended unless low torque or high speed is essential to the application.

Oil: In general, oil is used as a lubricant where grease is unsuitable, for example, where low torque or high speed are considerations. Typical oils used are the same as those used as the base oils in greases. The operational life of oils is usually much less than that of equivalent greases due to evaporative losses. One exception is the perfluorinated hydrocarbon family of oils that have extremely low saturated vapor pressure (SVP), giving greatly extended life.

Standard Greases

Manufacturer	Brand name	Basic type grease	Operation temp.c	Use
Shell	Aeroshell 5	Mineral grease	-55~120	High Load Grease
Rocol	Foodlube HT2	CALCIUM Soap	-35~290	High temp.H2
				Food grade
Exxon	Beacon 325	synthetic grease	-55~120	General purpose
				grease
Exxon	Andok B(Mil-G-18709A)	Channeling petroleum grease	-30~95	Excellent high
				speed,low torque,
				light mass
Exxon	Andok C	Channeling petroleum grease	-30~120	Smooth running
				,long life
G.E.Versilube G300		Silicone gorase	-75~205	Lighe loads
				and fine
				moderate speed
Mobil28	(Mil-G-81332)	Synthetic hydrocarbon	-55~180	Wide temperature
				range,good low
				temperature torque
Chevron		Mineral grease	-30~180	High temperature
				range with good
				water resistance
Shell	Alvania2	Mineral grease	-35~120	Long life and
				wide application
Kluber	Kluberelectric	Synthetic hydrocarbon	-40~150	Conductive grease
DuPont	Krytox 240AC(mil-G-27617)	Fluorinated grease	-35~290	High temperature
				stablility with good
				lubricity properties
Shell	Dolium R	Petroleum grease	-40~150	Good corrosion
				resistance and
				water resistance
KYODO	SRL	Synthetic grease	-40~150	Low noise,low
				torque and
				special case
NIG-ACE	W	Synthetic grease	-18~150	Low noise,low
				torque and
				special case
Mobil	HP	Lithium complex	-30~110	Vibration,moderate
				speeds and good
				corrosion resistance
Tianjin Hangu	Motor No.2	Mineral grease	-30~110	wide application,
				general purpose

Standard oil

Manufacturer	Brand name	Basic type grease	Operation temp.c	Use
Anderol BV	Anderol 402	Ester	–55/+150	General purpose
				aircraft/instrument
Shell	Aeroshell oil 12	Diester	–50/+130	General purpose
				aircraft/instrument
Dow Corning	DC200/100	Silicon	–40/+204	Wide temp. high torque,
				low speed/load. Safe with
				most plastics
Du Pont)	Krytox 143AZ	Fluoro-carbon	–53/+162	Excellent high speed,
				low torque,light mass

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LUBRICATION

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