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).
Determination of interference in involute teeth.
| Identifier | ExFiles\Box 28\5\ Scan099 | |
| Date | 16th March 1918 | |
| R.R. 235a (500 T) (S.D. 408. 28-4-17.) Bm. 2/158/13. -1- 16.3.18. X.2047 DETERMINATION OF INTERFERENCE IN INVOLUTE TEETH. Referring to diagram:- P1CP2 is the maximum possible (but not practical) length of the path of contact, subject to the teeth having sufficient addendum. The portion K1CK{Mr Clark}2 intercepted between the addendum circles is the actual path of contact. The obliquity θ is shown exaggerated, so there is no interference on diagram as drawn. If we imagine θ to be reduced K1 and K2 will approach P1 and P2 respectively. Interference occurs when CK{Mr Clark}1 > CP1 (or when CK{Mr Clark}2 > CP2) because then the tips of the teeth on the lower wheel would come in contact with the teeth on the upper wheel within the circumference of the upper base circle, which would necessitate or cause undercutting. Or we may say:- Interference occurs if the point P1 falls within the addendum circle of the lower wheel, or P2 within that of the higher wheel, but interference will always occur first below the base circle of the smaller wheel. Hence interference occurs if O2 K1 > O2 P1 and the extent of the interference may be measured by the difference CK{Mr Clark}1 - CP1. Contd. | ||