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).
Tests on different pinion gear teeth designs to resolve motor engagement jamming issues.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan225 | |
| Date | 4th May 1929 | |
| To R.{Sir Henry Royce} from EFC. c. SG.{Arthur F. Sidgreaves - MD} E.{Mr Elliott - Chief Engineer} c. BY.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} S.S. MOTOR ENGAGEMENT. It will be remembered that when we tried a pinion with sharp engaging corners, rounded disengaging corners and nonbacked-off teeth, we ran into a new kind of jam, described in our EFC2/T26.1.29. It was later reported that this type of jam was cured by backed-off teeth as suggested by E.{Mr Elliott - Chief Engineer} The same modification has not entirely cured the corner jam. It should be stated that the wheel on our bench rig test has remained with teeth with sharp engaging corners rounded disengaging corners and no backing off - in the above tests and also in those described below. Since that time we have experimented with a pinion with complete rounding, and also with a pinion with teeth left completely sharp. The results of these tests have been that there is little to choose between - (1) Pinion with rounded engaging corners, rounded disengaging corners and teeth backed off. (2) Pinion with completely rounded teeth (like gear teeth) (3) Pinion with teeth left completely sharp. because in each of the above three cases, a small percentage of corner jamming occurs and no jamming of the newly observed type mentioned above. Instructions for production and for experimental cars which are intended to be like production have incorporated No.1 type. We are, however, also instructing two cases of | ||