Selection of bearing pdf

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When a bearing must perform under demanding conditions, the lubricant selection becomes critical. Lubrication will affect life, torque, speed, noise, grease migration out gassing, temperature and rust prevention of the bearing. Two basic types of lubricants available are oil and grease. Applications that require extremely low torque or narrow range of torque variation are suited to use oil as a lubricant. Depending on the application, it is possible that an oil lubricant may not meet a specific requirement. Grease is an oil to which a thickener has been added.

Oil is the basic lubricant for ball bearings. Previously most lubricating oil was refined from petroleum. Today, however, synthetic oils such as diesters, silicone polymers, and fluorinated compounds have found acceptance because of improvements in properties. Grease is an oil to which a thickener has been added to prevent oil migration from the lubrication site. It is used in situations where frequent replenishment of the lubricant is undesirable or impossible. All of the oil types mentioned here can be used as grease bases to which are added metallic soaps, synthetic fillers and thickeners. The operative properties of grease depend almost wholly on the base oil.

Other factors being equal, the use of grease rather than oil results in higher starting and running torque and can limit the bearing to lower speeds. Because of the wide variety and complexity of additives, the characteristics of similar greases change considerably from one manufacturer to another. This further refinement eliminates unwanted properties, leaving only the desired chemicals chains. Additives are introduced to increase the oxidation resistance, etc.

The esters, diesters and poly-a-olefins are probably the most common synthetic lubricants. Synthetic hydrocarbons are finding a greater use in the miniature and instrument ball bearing industry because they have proved to be a superior general purpose lubricant for a variety of speeds, temperatures and environments. 3 of the value if a silicone product is used. This specialty lubricant has excellent load carrying capabilities but its inertness makes it less compatible to additives, and less corrosion resistant. Grease packing to approximately one quarter to one third of a ball bearing’s free volume is one of the most common methods of lubrication. Volumes can be controlled to a fraction of a percent for precision applications by special lubricators.

Excessive grease, however, is as detrimental to a bearing as insufficient grease. It causes shearing,heat buildup, unnecessarily high torque, and deterioration through constant churning which can ultimately result in bearing failure. Centrifuging an oil lubricated bearing removes excess oil and leaves only a very thin film on all surfaces. This method is used on very low torque bearings and can be specified by the customer for critical applications. There are many lubricants available for ball bearings. You will find a chart at in the next page that lists a variety of types, one of which should work well for most operating conditions. Developed for aircraft bearings and mechanisms.

Very quiet, widely used motor grease. OK for low speed oscillation. OK for high speed oscillation. Suitable for automotive radiator cooling fan applications and other high temperature motor bearings.

Vacuum cleaner and power tool applications. Low noise and high speed. NMB, a Minebea Group Company, is the world’s largest manufacturer of miniature precision ball bearings and a volume leader in the design and manufacturing of precision electro-mechanical components, including cooling fans, precision small motors and mechanical bearing assemblies, among others. NMB products can be found in the personal computing, networking, telecommunications, home entertainment, home electronics, automotive, medical and industrial markets. What is a Ball Bearing?

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Go to Bearings White Papers. When a bearing must perform under demanding conditions, the lubricant selection becomes critical. Lubrication will affect life, torque, speed, noise, grease migration out gassing, temperature and rust prevention of the bearing. Two basic types of lubricants available are oil and grease. Applications that require extremely low torque or narrow range of torque variation are suited to use oil as a lubricant. Depending on the application, it is possible that an oil lubricant may not meet a specific requirement. Grease is an oil to which a thickener has been added.

Oil is the basic lubricant for ball bearings. Previously most lubricating oil was refined from petroleum. Today, however, synthetic oils such as diesters, silicone polymers, and fluorinated compounds have found acceptance because of improvements in properties. Grease is an oil to which a thickener has been added to prevent oil migration from the lubrication site.