Rotary Rolling Contact Bearings - University of Utah
Rotary Rolling Contact Bearings
ME EN 7960 ? Precision Machine Design Topic 10
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-1
Ball Bearing Nomenclature
Rotary ball bearings are defined through geometry and performance.
Geometry: Outside diameter Inside diameter Width
Performance: Load capacity (radial, axial, moment) Stiffness (radial, axial, moment) Runout Bearing life Allowable speed Lubrication etc.
Source: Shigley JE, Mischke CR, Mechanical Engineering Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-2
1
Ball Bearing Types (Rotary)
Source: Shigley JE, Mischke CR, Mechanical Engineering Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-3
Ball Bearings (Rotary)
Source: Juvinall RC, Marshek KM, Fundamentals Of Machine Component Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-4
2
Bearing Sizes
Source: Juvinall RC, Marshek KM, Fundamentals Of Machine Component Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-5
Bearing Seals
Source: Juvinall RC, Marshek KM, Fundamentals Of Machine Component Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-6
3
Ball Bearings ? Details
? The ball has a smaller radius than the groove
? The load capacity of a bearing is limited by the contact stresses between the rolling elements and the races
Source: Juvinall RC, Marshek KM, Fundamentals Of Machine Component Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-7
Ball Bearings - Assembly
Step 1: Move the inner race to one side of the out race Step 2: Locate the largest gap between the two races and insert the balls in the groove Step 3: Distribute the balls evenly, thereby centering the inner race with respect to the outer race Step 4: Place the separator (retainer)
Source: Juvinall RC, Marshek KM, Fundamentals Of Machine Component Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-8
4
Roller Bearings (Rotary)
a) Straight roller b) Spherical roller c) Tapered roller thrust d) Needle e) Tapered roller f) Steep-angle tapered.
Source: Shigley JE, Mischke CR, Mechanical Engineering Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-9
Roller Bearings (Rotary)
Source: Juvinall RC, Marshek KM, Fundamentals Of Machine Component Design
ME EN 7960 ? Precision Machine Design ? Rolling Contact Bearings
10-10
5
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