BEARINGS. COMPONENTS AND SPECIFICATIONS

Date: 2015-10-07; view: 337.

Task 3. Read and translate the following text.

Rolling-contact bearings are designed to support and locate rotating shafts or parts in machines. They transfer loads between rotating and stationary members and permit relatively free rotation with a minimum of friction. They consist of rolling elements (balls or rollers)between an outerand inner ring. Cagesare used to space the rolling elements from each other. Figure 1 illustrates the common terminology used in describing rolling-contact bearings.

The inner and outer rings of a rolling-contact bearing are normally made of SAE 52100 steel, hardened to Rockwell C 60 to 67. The rolling-element raceways are accurately ground in the rings to a very fine finish (16 min or less). Rings are available for special purposes in such materials as stainless steel, ceramics, and plastic. These materials are used in applications where corrosion is a problem.

Normally the rolling elements, balls or rollers, are made of the same material and finished like the rings. Other rolling-element materials, such as stainless steel, ceramics and plastics, are used in conjunction with various ring materials where corrosion is a factor.