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).
Research document summarizing tests on 'spoked' phenolic laminated gears to assess noise, resilience, and shock resistance.
| Identifier | ExFiles\Box 136\4\ scan0083 | |
| Date | 1st March 1934 | |
| Copy. Y2061 I.A.E. RESEARCH AND STANDARDISATION COMMITTEE. Research Department, No.7064 Class 336, 67. 5, Bolton Road, Chiswick, W.4. March 1934. 'Spoked' Phenolic Laminated Gears. J.A.Petho, Aut. Ind. March 3, 1934, p.280. Phenolic laminated materials produce sounds of low frequency, and tests carried out at the Continental-Diamond Fibre Co. U.S.A. show that the use of 'spoked' gears eliminates the dangers of pick-up and amplification of noise. Sound analysis of the noise generated by engine-timing gears showed the prevalence of critical speed harmonics with solid web gears, and the total absence of such peaks when using 'spoked' gears. One of the main characteristics of phenolic laminated material is its resilience and the development of the 'spoked' gear has increased this characteristic in the plane of rotation, whereby gear life has been increased by approximately 50%. Static side deflection tests carried out by supporting the rim on a rigid base, and applying axial pressure to the hub showed that the loads at which the gears fractured were 4400 and 4000 lb. respectively, for the solid and 'spoked' gears. Dynamic tests showed the superiority of the spoked gear in regard to resistance to shock. H.L. | ||