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T-2
SECTION 5
INTERNAL GEARS ................................................................................. T-42
5.1
Internal Gear Calculations ...................................................................................... T-42
5.2
Interference In Internal Gears ................................................................................ T-44
5.3
Internal Gear With Small Differences In Numbers Of Teeth ................................ T-46
SECTION 6
HELICAL GEARS .................................................................................... T-47
6.1
Generation Of The Helical Tooth ........................................................................... T-48
6.2
Fundamentals Of Helical Teeth .............................................................................. T-48
6.3
Equivalent Spur Gear .............................................................................................. T-50
6.4
Helical Gear Pressure Angle .................................................................................. T-51
6.5
Importance Of Normal Plane Geometry ................................................................ T-51
6.6
Helical Tooth Proportions ....................................................................................... T-51
6.7
Parallel Shaft Helical Gear Meshes ....................................................................... T-51
6.8
Helical Gear Contact Ratio ..................................................................................... T-52
6.9
Design Considerations ............................................................................................ T-52
6.9.1
Involute Interference ................................................................................ T-52
6.9.2
Normal vs. Radial Module (Pitch) ........................................................... T-52
6.10 Helical Gear Calculations ....................................................................................... T-53
6.10.1
Normal System Helical Gear ................................................................... T-53
6.10.2
Radial System Helical Gear .................................................................... T-54
6.10.3
Sunderland Double Helical Gear ............................................................ T-55
6.10.4
Helical Rack .............................................................................................. T-56
SECTION 7
SCREW GEAR OR CROSSED HELICAL GEAR MESHES ................. T-57
7.1
Features ................................................................................................................... T-57
7.1.1
Helix Angle and Hands ............................................................................ T-57
7.1.2
Module ...................................................................................................... T-57
7.1.3
Center Distance ........................................................................................ T-58
7.1.4
Velocity Ratio ........................................................................................... T-58
7.2
Screw Gear Calculations ........................................................................................ T-58
7.3
Axial Thrust Of Helical Gears ................................................................................. T-60
SECTION 8
BEVEL GEARING .................................................................................... T-60
8.1
Development And Geometry Of Bevel Gears ....................................................... T-61
8.2
Bevel Gear Tooth Proportions ................................................................................ T-62
8.3
Velocity Ratio ........................................................................................................... T-62
8.4
Forms Of Bevel Teeth ............................................................................................. T-62
8.5
Bevel Gear Calculations ......................................................................................... T-64
8.5.1
Gleason Straight Bevel Gears ................................................................. T-66
8.5.2
Standard Straight Bevel Gears ............................................................... T-68
8.5.3
Gleason Spiral Bevel Gears .................................................................... T-69
8.5.4
Gleason Zerol Spiral Bevel Gears .......................................................... T-70
