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T-6
SECTION 18
DESIGN OF PLASTIC GEARS ............................................................... T-194
18.1 General Considerations Of Plastic Gearing .......................................................... T-194
18.2 Properties Of Plastic Gear Materials ..................................................................... T-194
18.3 Choice Of Pressure Angles And Modules ............................................................. T-204
18.4 Strength Of Plastic Spur Gears .............................................................................. T-204
18.4.1
Bending Strength of Spur Gears ............................................................. T-205
18.4.2
Surface Strength of Plastic Spur Gears ................................................. T-206
18.4.3
Bending Strength of Plastic Bevel Gears ............................................... T-206
18.4.4
Bending Strength of Plastic Worm Gears .............................................. T-209
18.4.5
Strength of Plastic Keyway ..................................................................... T-210
18.5 Effect Of Part Shrinkage On Plastic Gear Design ................................................ T-210
18.6 Proper Use Of Plastic Gears .................................................................................. T-212
18.6.1
Backlash ................................................................................................... T-212
18.6.2
Environment and Tolerances .................................................................. T-213
18.6.3
Avoiding Stress Concentration ................................................................ T-213
18.6.4
Metal Inserts ............................................................................................. T-213
18.6.5
Attachment of Plastic Gears to Shafts ................................................... T-214
18.6.6
Lubrication ................................................................................................ T-214
18.6.7
Molded vs. Cut Plastic Gears .................................................................. T-215
18.6.8
Elimination of Gear Noise ........................................................................ T-215
18.7 Mold Construction ................................................................................................... T-216
SECTION 19
FEATURES OF TOOTH SURFACE CONTACT .................................... T-221
19.1 Surface Contact Of Spur And Helical Meshes .................................................. T-221
19.2 Surface Contact Of A Bevel Gear ............................................................................ T-221
19.2.1
The Offset Error of Shaft Alignment .................................................... T-222
19.2.2
The Shaft Angle Error of Gear Box ..................................................... T-222
19.2.3
Mounting Distance Error ....................................................................... T-222
19.3 Surface Contact Of Worm And Worm Gear ...................................................... T-223
19.3.1
Shaft Angle Error .................................................................................... T-223
19.3.2
Center Distance Error ............................................................................ T-224
19.3.3
Mounting Distance Error ....................................................................... T-224
SECTION 20
LUBRICATION OF GEARS .................................................................... T-225
20.1 Methods Of Lubrication ........................................................................................ T-225
20.1.1
Grease Lubrication ................................................................................... T-225
20.1.2
Splash Lubrication ................................................................................... T-226
20.1.3
Forced-Circulation Lubrication ................................................................ T-227
20.2 Gear Lubricants ..................................................................................................... T-227
20.2.1
Viscosity of Lubricant ............................................................................... T-227
20.2.2
Selection of Lubricant .............................................................................. T-229
SECTION 21
GEAR NOISE ........................................................................................... T-231
REFERENCES AND LITERATURE OF GENERAL INTEREST ........................................... T-232
