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).
Investigation into increased initial friction in the 20 HP starter pinion unit.
| Identifier | ExFiles\Box 40\5\ Scan198 | |
| Date | 27th November 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to SY. Y3867 Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux}/LGS.11.27. 20 HP. STARTER. Y5650 INCREASED INITIAL FRICTION IN PINION UNIT. We are now investigating increased initial friction. We have found that on the present starter motor, since changing the springs, a decided improvement has been made, but if the cork washer is less in thickness than .187, there is a tendency to slip before the unit is fully engaged. The reason for this is that we get an additional friction between the steel washer and operating sleeve by the compression of the cork when fitting the end cap in position. If a thin, or a cork washer becomes undersize, this additional friction is lost. We are now trying out the schemes of LeC.2441 which incorporates this extra initial friction and as far as the tests have gone, they appear to be satisfactory. Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||