17.4.3.L
Tooth Flank Load Distribution Factor, KHb
Factors are listed in Tables 17-25 and 17-26.
If the gear and pinion are unhardened, the factors are to be reduced to
90% of the values in the table.
| Table
17-25 Tooth Flank Load Distribution Factor for Spiral Bevel Gears,
Zerol Bevel Gears and Straight Bevel Gears with Crownina. KHb
|
| Stiffness
of Shaft, Gear Box, etc. |
Both
Gears Supported On Two Sides |
One
Gear Supported on One End |
Both
Gears Supported on One End |
| Very
Stiff |
1.3 |
1.5 |
1.7 |
| Average |
1.6 |
1.85 |
2.1 |
| Somewhat
Weak |
1.75 |
2.1 |
2.5 |
|
| Table
17-26 Tooth Flank Load Distribution Factor for Straight Bevel Gear
without Crownina. KHb
|
| Stiffness
of Shaft, Gear Box, etc. |
Both
Gears Supported On Two Sides |
One
Gear Supported on One End |
Both
Gears Supported on One End |
| Very
Stiff |
1.3 |
1.5 |
1.7 |
| Average |
1.85 |
2.1 |
2.6 |
| somewhat
Weak |
2.8 |
3.3 |
3.8 |
|
|
17.4.3.M
Dynamic Load Factor, Kv
The dynamic load factor can be obtained from Table 17-24.
17.4.3.N Overload
Factor, KO
The overload factor can be computed by Equation 17-11 or found in Table
17-4.
17.4.3.O Reliability
Factor, CR
The general practice is to assume CR to be at least 1.15.
17.4.3.P Allowable
Hertz Stress, sHlim
The values of allowable Hertz stress are given in Tables 17-12
through 17-16.
17.4.4 Examples of
Bevel Gear Surface Strength Calculation
Tables 17-26A and 17-26B give the calculations
of surface strength factors of Gleason straight bevel gears. |