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 tooth design, grinding processes for side shaft gears, and the use of hunting teeth.
| Identifier | ExFiles\Box 75\1\ scan0052 | |
| Date | 18th December 1912 | |
| -9- consequent variation in velocity would be to fit a very light spring drive, friction damped, operating between the driven flywheel and its shaft. The friction damping must of course be less, torsionally, than the spring drive, and the springs of the spring drive must have a fairly high rating. I do not contend that this device will automatically form the perfect involute, but only that it will generate two curves which will gear together to give a constant pitch line velocity. This point raises another question, which is, that for side shaft gears (to be formed by this rig,) should be preferably of a ratio such that the number of teeth in one gear is devisable by the number of teeth in its mate, and that the mating teeth should be marked when in the rig so that they can be assembled in a similar manner. The best gear for grinding in with this process would be those having an equal number of teeth in each wheel, in which case the teeth would also have to be marked. For gears such as those employed for obtaining the speeds where one wheel is expected to gear with the other in any position,it is necessary to chose the number of teeth so that there is a hunting tooth. In this case the grinding process will be very much slower, as an average curve has to be formed by grinding each tooth with every (upside down footer text) H.{Arthur M. Hanbury - Head Complaints} M.{Mr Moon / Mr Moore} S L. (?) (H001) VOBB J.P. (?) 18.12.12.(C) 4057 | ||