| Symbol | Yd |
|---|---|
| Unit | - |
| Attribute-ID | bv2010 design factor |
| Numeric ID | 5379 |
| Value Type | PMDouble |
The design factor Yd considers the influence of reversal of the direction of rotation as well as, for shrunk-fit tooth rings, the influence of a pre-load on the load capacity of the tooth root.
| Requirement | Yd |
| Gears with occasional partial loads in the reverse direction | 0.9 |
| Idler gears | 0.7 |
| Shrunk-fit tooth rings | Calculation with specification of the shrinkage gap diameter Ds |
| In all other cases | 1.0 |
Source: Bureau Veritas (BV): Rules and Regulations for the Construction and Classification of Steel Vessels, Paris - 2014 edition