From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Calculations for determining gear interference, with an example for an Early Falcon epicyclic gear.
| Identifier | ExFiles\Box 28\5\ Scan101 | |
| Date | 28th April 1917 | |
| -3- Contd. and C F₁ = r sin θ Therefore extent of interference = C K₁ - C F₁ = √(s²sin²θ + a(2s + a)) - (r + s) sin θ Example. Early Falcon epicyclic gear. Sun wheel and planet pinion. Nos. of teeth 51 and 24. Module 2 mm. Obliquity θ = 14½°. Pitch diameters 102 mm. and 48 mm. Addendum = module = 2mm. r = 24, s = 51, a = 2 sin θ = .2504. (a² + 2as) / (r² + 2rs{Sir Henry Royce's Secretary}) = (4 + 204) / (576 + 2448) = 208 / 3024 = .0688 sin²θ = .0627 hence interference occurs. For extent of interference C K₁ - C F₁ contd. | ||