- Bearings The product of a bearing bore diameter and the shaft speed of a ball

Question

- Bearings The product of a bearing bore diameter and the shaft speed of a ball bearing is its DN or In considering a particular bearing for an application it is important to include factors relating to: 5. 9. a) Force Value b) Torque Value c) Speed Value d) Work Value a) Speed factors b) Loading factors c) Cost factors d) All of the above should be considered 6. Most bearings prematurely fail, due to Of the various types of bearings, Spherical bearings can accommodate misalignment in the range of 0.5 degrees to 2.0 degrees, with: 10. a) Lubrication Issues b) Over load Issues c Over speed Issues d) Contamination Issues a) b) c) d) A decrease of 50% in the load carrying capacity A reduction of 20% of the expected life of the bearing No deration of life or load ratings within the misalignment range listed Cannot really accommodate this misalignment Mounted plain bearings are available in housing types or mounting types such as: 7. a) Pillow Blocks b) Flange Bearings c) Take-up Bearings d) All of the above 11. Designs to insert bearings in ball bearing pillow A very thin flat piece of metal, used to determine the amount of space or diametral clearance in a spherical bearing is a: 8. blocks may include a) Specialty materials of construction to b) a) Caliper gauge b) Sizing gauge c) Feeler gauge d) Shim gauge accommodate a wide variety of applications Capabilities to be re-lubricated Seals and a variety of retaining styles to keep out the elements and secure shaft locking All of the above c) d) Short Answer Directions: Answer the following as completely as possible. 1. What are the significant factors to be considered when selecting any type of bearing? Powar Transmission Workbook 2-9

Explanation / Answer

5)speed value

6)lubrication issues

7)all the above

8)feeler gauge

9)all the above

10)no deration of life or load ratings within the misalignment range listed.

11)all the above

Factors considered while selection of bearing :

a) bearing envelope requirements and restrictions

b) weight limitations

c) allowable wear

d) life requirement,preferably in number of cycles

e) operating temperature range

f) pre-load and clearance requirements

g) lubrication methods

h) environmental conditions

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