Grease Bearing
August 19th, 2008
Grease Bearing
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Project Grease IT Bearing Oil Lubricant - Pro-Ject |  |
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US $31.42 | 14d 12h 54m |
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Clearaudio Turntable Bearing Grease | |
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US $18.06 | 13d 4h 27m |
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Garrard 301 Hammertone grease bearing turntable by Audio Grail | |
16 Bids | US $2,435.98 | 2d 18h 2m |
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HYDRAULIC PLATTER BEARING FOR GARRARD 301 TURNTABLE (OIL OR GREASE BEARING) | |
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US $119.00 | 3d 20h 42m |
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Garrard 301 Grey Hammer finish grease bearing Turntable | |
15 Bids | US $942.96 | 3d 18h 5m |
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Garrard 301 Grey Grease Bearing Turntable | |
0 Bid | US $1.57 | 4d 11h 59m |
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G70103 Thrust Bearing Grease(CT-4R) $7.1 G70103 Thrust Bearing Grease(CT-4R) is in stock and ready to ship from TrendTimes.com. Our toy stores sell G70103 Thrust Bearing Grease(CT-4R) for the best price of $7.10 and personal shoppers are standing by to assist you. |
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LPS 42870714 Thermaplex Bio Green Bearing Grease $26.59 Environmentally responsible . Excellent thermal and oxidative stability . Exceptional water resistance . Extends relubrication intervals for bearings . Green color allows easy visual inspection . Multiapplication bearing grease . Nontoxic . Outstanding extreme pressure (EP) performance . Premium performance biodegradable grease . Prolongs bearing life . Worker safe |
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LPS 42870814 Thermaplex Cs Moly Bearing Grease $24.29 Enhanced with molybdenum disulfide . Excellent adhesive and cohesive properties . Excellent oxidation stability . Extends relubrication intervals for bearings . Multiapplication bearing grease . NLGI No. 2 . Premium performance calcium sulfonate grease . Prolongs bearing life . Reduces wear from vibration . Superior water resistance . Very high load carrying capacity |
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Waterproof Grease $6.79 Bel-Ray Waterproof Grease Bel-Ray Waterproof Grease is an aluminum complex based grease with superior water resistance and load carrying capacity. It repels water and acts as an excellent seal on bearings exposed to all weather and wet conditions over a wide temperature range. Bel-Ray Waterproof Grease is an extremely stable grease compatible with all other greases, except clay base grease, making this the choice of grease for general purpose use, providing superior corrosion protection. For use in all conventional grease guns. Available in 14 oz. grease gun cartridge or a 16 oz. tub. Waterproof grease for all bearing and bushing applications Corrosion protection (even in salt water) Wear protection extends bearing life Will not melt or run For bearings and bushings |
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Please And Edelman Tomkins Grease Gun Bearing Packer 70025 $32.95 For all grease guns |
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GREASE $31.99 GREASE |
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Grease $9.99 Grease |
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West Marine Grease Gun $24.99 West Marine Grease Gun . Convenient, one-hand operation, heavy duty design for years of trouble-free use. Contains lube gun and cartridge of marine wheel bearing grease 3oz |
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7772 - Wheel Bearing Grease 14.5Oz $15.25 [6210066] UPC: 071611977784 18.67L x 11.28W x 9.95H 1.01 LB 1.21 Cubes |
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High Pressure Grease 3000 $27.75 Motorex High Pressure Grease 3000 Lithium-complex grease with outstanding high-pressure properties Stable for temperatures from -30 degrees (C) to +180 degrees (C) Disc-brake bearing grease that won’t break down under high-heat conditions Available in 850g jar |
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Sierra Premium Marine Bearing Grease (2) 3 Oz Cartridges $8.99 Sierra Premium Marine Bearing Grease (2) 3 Oz Cartridges . Package of two (2) 3 oz cartridges Specifically formulated for marine applications Premium lithium formulation for optimum corrosion protection in freshwater and saltwater applications Ideal for marine trailer wheel bearing, universal joints, and outdrive pivot joints |
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West Marine Refill For Heavy Duty Wheel Bearing Grease Gun Gun, 14 Oz. $11.49 West Marine Refill For Heavy Duty Wheel Bearing Grease Gun Gun, 14 Oz. . Refill for the Heavy Duty Grease Gun, model 401141 14 oz. Grease gun sold separately |
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Marine And Industrial Corrosion Control And Trailer Bearing Grease Corrosion Pro 12Oz Spray $10.94 Marine And Industrial Corrosion Control And Trailer Bearing Grease Corrosion Pro 12Oz Spray LubriMatic Marine and Industrial Corrosion Control and Trailer Bearing Grease - CORROSION PRO 12OZ SPRAY |
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Finish Line Ceramic Grease $7.99 Finish Line Ceramic Grease. Finish Line's Ceramic Grease is the bicycle industry's newest and most advanced bearing lubrication technology. Ceramically reinforced Teflon prevents surface-to-surface contact and scuffing while providing unmatched low-friction lubrication under boundary conditions. |
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Frigidaire Dryer Rear Bearing Kit 5303281153
Sale Price: $6.95  |
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KitchenAid W10112253 Worm Gear
Sale Price: $1.95 |
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Chamberlain LiftMaster Sears Craftsman 41C4220A Gear & Sprocket Assembly Kit
List Price: |
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Whirlpool Agitator Cam Repair Kit 285811 285746 3351001
Sale Price: $2.90 |
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Lubriplate 10oz Low Temp Garage Door Grease
List Price: |
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Bearing Grease - 10 oz - Special Order est. 10 Days
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Dantona 3.6V 800Mah Sony Spp-A278 Equivalent Battery Modern Design Practical Durable Compact New
List Price: |
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Gravity Roller Conveyor Curve - 45º - 32" BF, 1.9" rollers
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Masscool 8W501B1M3G Quiet For LGA775 CPU Fan Ball Copper Base Insert Dual Radial Fin Design
List Price: |
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Thermaltake CLP0564 FRIO CPU Cooler Ultimate Overclocking Thermal Structure Design
List Price: |
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Cosmos ® Cooling VGA Heatsink cooler with ball bearing fan+Cosmos Cable Tie
Sale Price: $11.99 |
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Pelican 1510-004-110 Case with Padded Dividers, Black
List Price: |
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DeoxIT® FaderLube Oiler, (NSN-6850-01-477-1566) 100% solutio
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Bones Speed Cream Skate Bearing Lubricant
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Traxxas Thrust Bearing Grease
Sale Price: $5.39 |
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Thunder Tiger One-Way Grease R30/R50/X50/R90 TTRPV0517
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Royal Purple 01312 NLGI No. 2 High Performance Multi-Purpose Synthetic Ultra Performance Grease - 14.5 oz.
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Lisle 34550 Handy Packer Bearing Packer
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Red Line 80402 Synthetic Grease
Sale Price: $11.95 |
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Park Tool PPL-2 Polylube 1000 Grease Tub (1 Lb)
List Price: |
How to Repack Grease & Adjust Wheel Bearing in Cars : How to Remove Brake Calipers on Cars
Lubricant Failure = Bearing Failure
Rolling element bearings are highly reliable components, and the vast majority of bearings will outlive the equipment on which they are installed. However, while bearings account for a relatively small percentage of all equipment breakdowns, they do fail occasionally. And when they fail, it is usually a critical event, resulting in costly repair and downtime.
When bearings fail, only a small number of failures are caused by material fatigue. Most failures are caused by a condition that usually can be prevented. Typically, the causes of bearing failure can be traced to:
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Harsh operating conditions
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Faulty storage, handling and installation
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Poor lubrication
This article focuses on bearing failures associated with lubrication problems.
Avoiding Lubricant Failures
Bearings fail for many reasons, but improper lubrication is at the top of the list, according to a variety of studies:
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Improper lubrication: 40 to 50 percent
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Improper mounting: 25 to 30 percent
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Other causes: approximately 20 percent
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Reaching the natural fatigue limit: less than 10 percent
Anti-friction bearings must be lubricated to prevent metal-to-metal contact between the rolling elements, raceways and retainers. In addition, lubrication protects the bearing against corrosion and wear, helps dissipate heat, helps seal out solid and liquid contamination, and reduces bearing noise. A properly lubricated bearing has the best chance of reaching its maximum service life.
As with bearings themselves, there are numerous causes for lubricant failure, including:
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Insufficient lubricant quantity or viscosity
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Deterioration due to prolonged service without replenishment
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Excessive temperatures
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Contamination with foreign matter
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Use of grease when conditions dictate the use of static or circulating oil
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Incorrect grease base for a particular application
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Over-lubricating
Rolling element bearings depend on the continuous presence of a very thin ¨C millionths of an inch ¨C elastohydrodynamic film of lubricant between rolling elements and raceways, and between the cage, rings and rolling elements. Lubricant-related failures can be avoided by selecting a grease or oil that generates a sufficient film to keep bearing elements separated. A good lubricant also provides good boundary lubrication.
Lubricant failures can be detected by the presence of discolored (blue/brown) raceways and rolling elements. Excessive wear on rolling elements, rings and cages follows, resulting in overheating and subsequent catastrophic failure.
In addition, if a bearing has insufficient lubrication, or if the lubricant has lost its lubricating properties, an oil film with sufficient load-carrying capacity cannot form. The result is metal-to-metal contact between rolling elements and raceways, leading to adhesive wear.
Adhesive wear modes include scoring, galling, seizing and scuffing. These failures result when the lubricant film is too thin to prevent the welding together of microscopic projections at the sliding interfaces between two mating parts. After the projections weld together, sliding forces tear the metal from one surface, creating minute cavities on one surface and projections on the other. These defects lead to even more damage. Although adhesive wear starts on a microscopic level, it progresses steadily once it starts.
Lubricant Selection
Lubrication obviously plays a vital role in the performance and life of a bearing. Without lubrication, bearings can be expected to fail early and possibly cause other equipment to fail. The three main concerns with bearing lubrication are:
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Specifying the right amount ¨C Rolling element bearings operate at their optimum temperature when the minimum amount of lubricant is used. The quantity of lubricant required also depends on the other functions it must perform, such as cooling and sealing.
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Specifying the right type ¨C Rolling element bearings can be lubricated with grease or oil. In special cases, solid lubricants can be used.
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Keeping the lubricant clean.
The choice of lubricant depends on conditions such as operating temperature, rotating speed, loads and the environment. Generally, oil is the best bearing lubricant, but it is not always practical because of design considerations.
Grease lubrication should be used when the bearing operates under normal speeds and temperatures. Grease has several advantages over oil, including simpler and less expensive application procedures, better adhesion, and improved protection against moisture and contaminants.
Grease selection varies with the application. Factors to consider include hardness (consistency), stability (ability to retain consistency) and water resistance (emulsification). However, grease is oil suspended in a base or carrier, and when these bases are exposed to moisture or heat, they can turn into soap or carbon ash. Therefore, it may be necessary to use synthetic additives to prevent deterioration of the base.
Overfilling may cause a rapid rise in temperature, particularly at high speeds because the rolling elements have to push the grease out of the way. This leads to churning in the grease, which produces heat. Adding more grease only worsens the problem, creating the risk of blowing out a seal.
Bearings operating at slow speeds, and those requiring corrosion protection, can have their housing completely full of grease. The length of time that a grease-lubricated bearing will operate satisfactorily without relubrication depends on bearing size, type, speed, operating temperature and the grease used.
Oil is the preferred lubricant when speed or operating conditions preclude the use of grease or where heat must be transferred from the bearing. Oil is often used to meet the operating requirements of other components such as seals and gears.
Oil bath systems are suitable for low shaft speeds. To avoid frequent oil changes due to high operating temperatures, an oil circulation system can be used. At high shaft speeds, oil must penetrate the interior of the bearing to remove excess heat. An oil injection system is an effective method to ensure that oil gets to where it is needed. The speed of oil being injected must be high enough to ensure that sufficient oil penetrates the air vortex created during bearing rotation.
The frequency at which oil needs to be changed depends on the operating conditions and the oil quality. For oil bath systems, oil should be changed more often if its temperature exceeds 120 degrees Fahrenheit, or if the machine operates in an environment containing abrasives or contaminants. For circulating oil systems, oil change intervals are determined by checking oil quality to determine the presence of abrasive particles, oil oxidation and additive breakdown.
Lubricant Viscosity
Oil viscosity is just as important as oil quantity to ensure adequate lubrication. Required viscosity depends on operating temperature. Inadequate lubricant viscosity appears as a highly glazed or glossy surface. As damage progresses, the surface appears frosty and eventually spalls. This type of spalling is fine-grained compared to the more coarsely grained pattern produced by fatigue failure.
In the frosty stage, the fine slivers of metal pulled from the raceway create a ¡°nap¡± that can sometimes be felt. The frosted area will feel smooth in one direction but have a distinct roughness in the other. As metal is ¡°pulled¡± from the surface, pits appear and frosting advances to pulling.
Smearing is a form of surface damage caused when two surfaces slide and the lubricant cannot prevent adhesion of the surfaces. Minute pieces of one surface are torn away and rewelded to either surface.
Skid smearing occurs when rolling elements slide as they pass from the unloaded zone to the loaded zone. Too stiff a lubricant also causes this type of damage, which is most likely to happen in large bearings.
Smearing can occur on the roller surfaces and in the raceways of spherical and cylindrical roller bearings. It is caused by roller rotation being retarded in the unloading zone, where the rings do not drive the rollers. Consequently, their rotational speed is lower than when they are in the loaded zone. The rollers, therefore, are subjected to rapid acceleration, and the resultant sliding is so severe that it may produce smearing.
Grooving also results from inadequate lubrication. The areas subject to sliding friction, such as locating flanges and the ends of rollers in a roller bearing, are the first parts affected.
Where speeds are high, inertial forces become important, and the best lubrication is required. Inertial forces acting on the rolling elements at high speed, with sudden starting and stopping, can result in high forces between rolling elements and the cage. The forces skew the cage, and repeated force application eventfully causes the cage to crack and break.
Inadequate flow in a circulating oil system can cause failures of tapered roller bearings. The area between the guide flange and the large end of the roller is subject to sliding motion and is more difficult to lubricate than areas under rolling motion. Therefore, some of the rollers can weld themselves to the guide flange.
Leaky Seals
Even under the best operating conditions, bearing seals can leak. Typically, seal leaks can be traced to three basic causes:
- Condition and size of the shaft and housing bore
- Poor installation practices
- Contamination
When a seal leaks, the most common cause is a worn or scored shaft, most often the result of abrasion caused by contamination. The shaft should be replaced or repaired to prevent seal damage.
If the seal¡¯s main function is to exclude foreign matter, the seal lip should face toward the dirt instead of the bearing. If the lubricant is under pressure from heat buildup or other sources, the lip should face the pressure.
A leaking seal is not always an indicator of seal failure. In pillow block bearings, for example, excess grease is often purged through the seals during operation. This indicates that the seal is working properly.
About the Author
Chuang Hon Yi Axle Co.,Ltd. Chuang Hon Yi Axle Co.,Ltd. was established in Kaohsiung,Taiwan in 1989 and is one of the leading bearing companies in Taiwan.
With the increasing turnover,CHY now have a factory in Ningbo,China whose high performance NBK bearings has acquired tremendous goodwill and reputation for quality and performance. It specializes in manufacturing and international trade of a wide range of deep groove ball bearings including miniature ball bearings .The annual output of bearings has reached 90,000,000 pieces,of inner diameter 3mm~50mm.
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