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).
Pinion and flywheel gear specifications for a starting device, including questions posed to the Bijur Company.
| Identifier | ExFiles\Box 40\5\ Scan114 | |
| Date | 28th December 1922 guessed | |
| Oy2-W-1323 -2- What they fear is the pouring of quantities of oil all over the device, such as might occur with the present large oil filler. 4 - Pinion size It would perhaps be possible to add a tooth to the flywheel ring gear in order to take a 13 tooth pinion, without changing the flywheel housing. In view of the fact that the driving pinion does not spin around when the engine starts with the Bijur device, but is immediately thrown out of gear, one does not get a scream from the pinion teeth as one does with, say, the Westinghouse or Delco manual shift. We think this makes it possible to use a higher reduction ratio without excessive noise. 5 - Other details The rest of Mr. Hives' questions are answered in their letter. We asked the Bijur Company a - What slack was recommended between pinion and shaft b - Should the pinion be bushed c - What chamfer angle should be used on pinion and gear (In connection with this, they have always recommended that soft ring gears should not be initially chamfered with their device. After a time a slight chamfer is worn on the back of the teeth by the act of disengaging. On the Liberty, the teeth on the flywheel gear were not chamfered.) d - What are the torques which the device will carry, and what is the method of adjustment e - What parts wear out. That is, what parts should be stocked for service. Oy. | ||