Book 3 - Bearings Flashcards
a bearing is a device for locating a ______ with maximum radial restriction and/or axial restriction, yet allowing the greatest possible ________ of rotation
a bearing is a device for locating a SHAFT with maximum radial restriction and/or axial restriction, yet allowing the greatest possible FREEDOM of rotation
bearings are made from ___ carbon steel containing nickel, ____bdenum and chromium and are carburised to provide a hard, wear resistant surface
tolerances are 0.0001” or less
bearings are made from LOW carbon steel containing nickel, MOLYbdenum and chromium and are carburised to provide a hard, wear resistant surface
tolerances are 0.0001” or less
______ bearings are used for engine applications and in equipment with rotational speeds in excess of ___ RPM
CAGED bearings are used for engine applications and in equipment with rotational speeds in excess of 100 RPM
ball bearings are divided into four main groups:
- radial
- angular contact
- thrust
- instrument precision bearings
ball bearings are divided into four main groups:
- radial
- angular contact
- thrust
- instrument precision bearings
radial bearings are the ____ common type and are found in all forms of transmission assemblies and control rod ___-fittings
balls may be in single or double rows. can be retained in a cage or ________ ball races
crowded ball races are used only where slow ________ or oscillating movement is required
radial bearings are the MOST common type and are found in all forms of transmission assemblies and control rod END-fittings
balls may be in single or double rows. can be retained in a cage or CROWDED ball races
crowded ball races are used only where slow ROTATION or oscillating movement is required
angular contact bearings accept axial and radial loads in ___ direction only, for axial loads in both directions, an ________ pair of bearings is used
angular contact bearings accept axial and radial loads in ONE direction only, for axial loads in both directions, an OPPOSED pair of bearings is used
thrust bearing
thrust bearings carry _____ loading only, and are normally used in conjunction with a roller or radial ball bearing
most suitable for carrying ______ loads at slow speeds
thrust bearing
thrust bearings carry AXIAL loading only, and are normally used in conjunction with a roller or radial ball bearing
most suitable for carrying HEAVY loads at slow speeds
roller bearings are divided into three groups:
- cylindrical
- spherical
- tapered
roller bearings are divided into three groups:
- cylindrical
- spherical
- tapered
cylindrical roller bearings are capable of carrying greater radial loads than similar sized ball bearings. light, intermittent axial loads. roller diameter and length usually equal. cylindrical roller bearings susceptible to effects of misalignment and lack of lubricant
needle roller bearings have length several times longer than diameter. used where movement is oscillatory rather than rotary. susceptible to brinelling
cylindrical roller bearings are capable of carrying greater radial loads than similar sized ball bearings. light, intermittent axial loads. roller diameter and length usually equal. cylindrical roller bearings susceptible to effects of misalignment and lack of lubricant
needle roller bearings have length several times longer than diameter. used where movement is oscillatory rather than rotary. susceptible to brinelling
tapered roller bearings accepts simultaneous radial and axial loads in ___ direction only. when axial loads are present in both directions, two tapered roller bearings are used
these are mounted back to back and adjusted against each other to obtain a working clearance. proper lubrication is essential
tapered roller bearings accepts simultaneous radial and axial loads in ONE direction only. when axial loads are present in both directions, two tapered roller bearings are used
these are mounted back to back and adjusted against each other to obtain a working clearance. proper lubrication is essential
the most common type of ball bearings used in GTE’s are the ____ or roller type
to minimise the effects of the dynamic loads transmitted from the rotating assembly to the bearing housings, _______ film type bearings are used. these have small clearances between outer race of bearings and the housing which are filled with feed oil.
this reduces the vibration level of the engines and the possibility of damage by fatigue
the most common type of ball bearings used in GTE’s are the BALL or roller type
to minimise the effects of the dynamic loads transmitted from the rotating assembly to the bearing housings, SQUEEZE film type bearings are used. these have small clearances between outer race of bearings and the housing which are filled with feed oil.
this reduces the vibration level of the engines and the possibility of damage by fatigue
bearing health monitoring is achieved through SOAP (____________ ___ _________ _________)
bearing health monitoring is achieved through SOAP (SPECTROMETRIC OIL ANALYSIS PROGRAMME)
