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).
Operation and design scheme for a sequence starter unit, including a diagram.
| Identifier | WestWitteringFiles\P\July1926-September1926\ Scan116 | |
| Date | 22th September 1926 | |
| TO EFC. FROM R.{Sir Henry Royce} Copy to B.J. ORIGINAL SEQUENCE STARTER. In re-arranging this unit we have considered the following scheme which is shewn diagramatically hereunder to be good - [Diagram of a starter motor] 3-30 23/9/26 In this we probably attach the pinion to armature shaft by some form of simple spring drive. The armature acts as the solenoid for engaging the teeth which are cut slightly helical both to help engagement and disengagement. The spring being the real source of energy for disengagement. The operation of the system is as follows - (1) The teazer circuit is made and the end pull due to same is caused to overcome the out-of-gear spring and turn the motor slowly for engagement of the pinion teeth, the pull-in being helped by the slight helix of pinion teeth. (2) When the pinion is nearly fully engaged contact is made for the main switch magnet. (3) Teazer circuit broken by hold on magnet. (4) Engine is turned and when it fires and the main current falls, the out-of-gear spring operates to disengage the starter pinion, and is helped in this by the slight helix on pinion teeth. (1) | ||