Factors dialog box (ISO, DIN, CSN)

The display in this window depends upon the option selected in the Method of Strength Calculation selection list in the Calculation tab of Spur Gears Component Generator.

See Engineer's Handbook for calculation formulas on factors.

Access:

Ribbon: Design tab Power Transmission panel Spur Gear and on the Calculation tab, click Factors.

OK	Click to confirm the selection and close the dialog box.
Cancel	Closes the dialog box.
User Factors	Check the box to enter values manually.

Factors of Additional Load
Application Factor K A	Application factor takes account of dynamic overloads from sources external to the gearing. Click Factors... on the context menu to open Application factor dialog box where you can select the value.
Dynamic Factor K Hv	Dynamic Factor for contact takes into account load increments due to internal dynamic effects.
Dynamic Factor K Fv	Dynamic Factor for bending takes into account load increments due to internal dynamic effects.
Face Load Factor K Hβ	Face Load Factor for contact depends among other parameters on shaft angle and shaft displacement between gear 1 and gear 2. The influence of these parameters is determined using the Kinematic diagram. It is necessary to select kinematic diagram that corresponds with designed mechanism. Click behind the edit fields to open the Kinematic diagram dialog box where you can select the value.
Face Load Factor K Fβ	Face Load Factor for bending depends among other parameters on shaft angle and shaft displacement between gear 1 and gear 2. The influence of these parameters is determined using the Kinematic diagram. It is necessary to select kinematic diagram that corresponds with designed mechanism. Click behind the edit fields to open the Kinematic diagram dialog box where you can select the value.
Transverse Load Factor K Hα	Transverse load Factor for contact takes into account uneven load distribution in the transverse direction resulting, for example from pitch deviation.
Transverse Load Factor K Fα	Transverse load Factor for bending takes into account uneven load distribution in the transverse direction resulting, for example from pitch deviation.
One-time Overloading Factor K AS	One-time Overloading Factor takes into account maximal one-time overload of gear.
Factors for Contact
Zone Factor Z H	Zone Factor accounts for the influence on the Hertzian pressure of the tooth flank curvature at the pitch point.
Contact Ratio Factor Z ε	Contact Ratio Factor accounts for the influence of the transverse contact ratio and the overlap ratio on the specific surface load of the gears.
Single Tooth Pair Contact Factor Z B	Single Tooth Pair Contact Factor converts contact stress at the pitch point to the contact stress at the inner point of single pair tooth contact on the gear.
Life Factor Z N	Life Factor takes account of a higher permissible Hertzian stress if only limited durability is demanded.
Lubricant Factor Z L	Lubricant Factor accounts for the influence of the lubricant viscosity.
Roughness Factor Z R	Roughness Factor accounts for the influence of surface roughness.
Velocity Factor Z v	Velocity Factor accounts for the influence of pitch line velocity.
Helix Angle Factor Z β	Helix Angle Factor makes allowance for the influence of the helix angle on the surface durability.
Size Factor Z X	Size Factor accounts for the influence of the tooth dimensions for the permissible contact stress.
Work Hardening Factor Z W	Work Hardening Factor accounts for the effect of meshing with a surface hardened or similarly hard mating gear.
Factors for Bending
Form Factor Y Fa	Form Factor takes into account the influence on nominal tooth-root stress, of the tooth form with load applied at the tooth tip.
Stress Correction Factor Y Sa	Stress Correction Factor takes into account the conversion of the nominal bending stress determined for application of load at the tooth tip, to the local tooth-root stress. The following are taken into account: a) the stress amplifying effect of change of section at the tooth-root; and b) that evaluation of the true stress system, at the tooth-root critical section, is more complex than the simple system evaluation presented, but the influence of the bending moment arm is neglected.
Teeth With Grinding Notches Factor Y Sag	Teeth With Grinding Notches Factor accounts for the influence of grinding notches in the fillet of a gear near the critical section. It also take into consideration the reduction in the tooth-root thickness.
Helix Angle Factor Y β	Helix Angle Factor takes into account influences of the helix angle, such as the variation of the load along the lines of contact.
Contact Ratio Factor Y ε	Contact Ratio Factor accounts for the influence of the transverse contact ratio and the overlap ratio on the specific surface load of the gears.
Alternating Load Factor Y A	Alternating Load Factor accounts for the influence of reversible load of teeth.
Production Technology Factor Y T	Production Technology Factor accounts for the influence of dedendum burnishing, and so on.
Life Factor Y N	Life Factor takes account of a higher permissible Hertzian stress if only limited durability is demanded.
Notch Sensitivity Factor Y δ	Notch Sensitivity Factor accounts for the influence of the notch sensitivity of the material.
Size Factor Y X	Size Factor accounts for the influence of the tooth dimensions on tooth bending strength.
Tooth Root Surface Factor Y R	Tooth Root Surface Factor accounts for the influence of surface roughness.