22-08-2012, 04:20 PM
Bearings
Bearings.ppt (Size: 7.6 MB / Downloads: 670)
Rolling Contact Bearings – load is transferred through rolling elements such as balls, straight and tapered cylinders and spherical rollers.
Journal (sleeve) Bearings – load is transferred through a thin film of lubricant (oil).
Rolling Contact Bearings
Ball bearings
Deep groove (Conrad) bearing
Filling notch ball bearing or maximum capacity bearing
Angular contact bearings (AC)
Roller bearings
Cylindrical bearings
Needle bearings
Tapered bearings
Spherical bearings
Bearing Life
If a bearing is clean, properly lubricated and mounted and is operating at reasonable temp., failure is due to fatigue caused by repeated contact stresses (Hertzian stress) crack initiates below the curved surface at the location of maximum shear stress, propagates to the surface causing surface damage.
Bearing Life – defines the number of revolution or hours of operation, at constant speed, in such a way that of the bearings tested (from the same group) will complete or exceed before the first evidence of failure develops. This is known as life.
Bearings.ppt (Size: 7.6 MB / Downloads: 670)
Rolling Contact Bearings – load is transferred through rolling elements such as balls, straight and tapered cylinders and spherical rollers.
Journal (sleeve) Bearings – load is transferred through a thin film of lubricant (oil).
Rolling Contact Bearings
Ball bearings
Deep groove (Conrad) bearing
Filling notch ball bearing or maximum capacity bearing
Angular contact bearings (AC)
Roller bearings
Cylindrical bearings
Needle bearings
Tapered bearings
Spherical bearings
Bearing Life
If a bearing is clean, properly lubricated and mounted and is operating at reasonable temp., failure is due to fatigue caused by repeated contact stresses (Hertzian stress) crack initiates below the curved surface at the location of maximum shear stress, propagates to the surface causing surface damage.
Bearing Life – defines the number of revolution or hours of operation, at constant speed, in such a way that of the bearings tested (from the same group) will complete or exceed before the first evidence of failure develops. This is known as life.