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).
Gear generating purposes, specifications, and methods for achieving gear quietness.
| Identifier | ExFiles\Box 136\5\ scan0309 | |
| Date | 31th August 1937 | |
| - 2 - (c) cont'd.{John DeLooze - Company Secretary} for generating purposes on the reduced diameter fixed by the eccentric hub, but will be "divided" or "indexed" on its own centre to its correct number of teeth. The effect of this will be to produce an involute with a smaller curvature or "barrel" as it is often called, and will result in a reduction of face load from the pitch line to flank and tip of the tooth respectively. (d). The amount by which the eccentric hub will be reduced will be accurately specified from my office, but the design for the modified method of cutting and grinding will be produced in the Tool Department which controls the gear cutting. (e). Gear quietness. There are other methods of attaining a similar result, notably a slight change in obliquity, but this does not achieve the full result. Again where "former" grinding is used the scheme I designed for aero gears some ten years ago is applicable. BY.{R.W. Bailey - Chief Engineer} | ||