KMI SLEWING BEARINGS
Glossary of abbreviations and symbols
| Bearing & gear dimensions | ||
|---|---|---|
| Symbol | Feature | Units |
| α | Pressure angle of gear teeth | ° |
| b2 | Face width of gear teeth | in |
| Bi | Size of hole in inner ring | in |
| Bo | Size of hole in outer ring | in |
| D2 | Pitch diameter of gear | in |
| di | Inside diameter of inner ring | in |
| Di | Internal diameter on outer ring | in |
| Do | Outside diameter of outer ring | in |
| do | External diameter on inner ring | in |
| Dp | Diameter of bearing raceway | in |
| dr | Internal diameter on inner ring | in |
| Dr | External diameter on outer ring | in |
| Dw | Diameter of rolling element | in |
| FD | Full depth involute spur gear (ref. ANSI B6.1-1968, R1974 or ISO 53:1998) |
– |
| FS | Fellow stub involute spur gear (ref. Machinery’s Handbook, 18th Edition) |
– |
| H | Height of overall bearing assembly | in |
| Hi | Height of inner ring | in |
| Ho | Height of outer ring | in |
| Li | Bolt circle in inner ring | in |
| Lo | Bolt circle in outer ring | in |
| m | Module of gear teeth = 25.4/Pd | mm |
| nf | Number of lubrication nipples/fittings per plane |
– |
| ni | Number of holes in inner ring | – |
| no | Number of holes in outer ring | – |
| Pd | Diametral pitch | – |
| SD | Stub involute spur gear (ref. ASA B6.1-1932) |
– |
| x2 | Addendum modification coefficient of gear teeth (“+” sign increase tooth thickness at D2 and “-” sign decreases tooth thickness at D2) |
– |
| z2 | Number of gear teeth | – |
| Bearing & gear properties | ||
|---|---|---|
| Symbol | Feature | Units |
| Crm | Moment load rating | ft-lbs |
| Fz | Maximum allowable gear tooth load | lbs |
| G | Weight of bearing assembly | lbs |
| Mw | Friction torque of bearing, installed and subjected to loads |
ft-lbs |
| Pinion dimensions | ||
|---|---|---|
| Symbol | Feature | Units |
| b1 | Face width | in |
| D1 | Pitch diameter | in |
| Di1 | Stock bore | in |
| Do1 | Outside diamter | in |
| Dr1 | Diamter of hub | in |
| L1 | Length of pinion | in |
| Pd | Diametral pitch | in |
| w | Square key size, nominal | in |
| x1 | Addendum modification coefficient | – |
| z1 | Number of teeth | – |
| Application data | ||
|---|---|---|
| Symbol | Feature | Units |
| fa | Applicaiton Service Factor | – |
| Fa | Force parallel to bearing axis of rotation | lbs |
| Fr | Force perpendicular to bearing axis of rotation | lbs |
| Mk | Tilting moment about bearing centerline | ft-lbs |
| N | Rotation speed | rpm |
| μ | Friction coefficient | – |
| Miscellaneous | ||
|---|---|---|
| Symbol | Feature | Units |
| ft | Linear unit of measurement | foot |
| ft-lbs | Units of torque or moment | foot-pounts |
| in | Linear unit of measurement | inch |
| lbs | Units of force or weight | pounds |
| mm | Linear unit of measurement (SI) | millimeter |
 |
Warning | – |
| References | |
|---|---|
| AGMA | American Gear Manufacturers Association |
| ANSI | American National Standards Institute |
| ASTM | American Society for Testing and Materials |
| DIN | Deutsches Institute für Normung |
| ISO | International Standards Organization |
| NLGI | National Lubricating Grease Institute |
| SAE | Society of Automative Engineers |