Normal pressure angle
| Symbol | αn |
|---|---|
| Unit | ° |
| Attribute-ID | normal pressure angle |
| Numeric ID | 1015 |
| Value Type | PMTechValue |
The normal pressure angle is the angle between the profile reference line and the line of action for a reference tool and workpiece pairing. The line of action is the tangent to the base circle. It passes through the contact points of the reference tool-workpiece mesh and the rolling point.
The normal pressure angle αn is equal to the profile angle αp of the reference profile.
Large pressure angles indicate a flat profile with a tendency toward pointed teeth and a thick tooth root. Small pressure angles lead to a thick tooth tip and a narrow tooth root.
| 1 | Profile reference line |
| 2 | Point of contact |
| C | Pitch point |
| db | Base diameter |
| αn | Normal pressure angle |
Asymmetrical gears can also be considered using the "load distribution (FEM)" calculation objective. Here, this value applies to the left flank. A different pressure angle can be specified for the right flank.