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).
The Lucas Electrical Helix Type Starter motor for use on B.40 engines.
| Identifier | ExFiles\Box 165\7\ img035 | |
| Date | 20th January 1950 | |
| File : 2209 B. To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/RC.{R. Childs} c. Gzy. c. FJH.{Fred J. Hardy - Chief Dev. Engineer} c. Kym. c. Ev.{Ivan Evernden - coachwork} c. JRR. c. JRR/RD. c. JRR/AJP. c. Rm{William Robotham - Chief Engineer}/JD.{J. Draper - Frames} c. Rm{William Robotham - Chief Engineer}/VL.{V. Lewis / Mr Valentine} Rm{William Robotham - Chief Engineer}/RC.{R. Childs}1/FMA. 20.1.50. Lucas Electrical Helix Type Starter motor for use on B.40 engines. The Lucas Electrical Helix type starter motor has an overriding clutch, and engagement is made by sliding the pinion into mesh with the flywheel teeth by means of a solenoid operated pinion-shift lever. The pinion is locked to the clutch casing, and the driving sleeve of the clutch is splined to the armature shaft but free to move longitudinally. When not in use, it is held in the disengaged position by a spring loaded pinion-shift lever. The solenoid assembly is mounted on the side of the motor carcase; the relay switch and the starter motor main switch is mounted on the commutator end of the solenoid yoke. (See sketch (1) and section drawing of the clutch). The relay has two sets of contacts, one to excite the teaser field of the motor, and the other to energize the solenoid. On pressing the starter push button, both sets of contacts are closed; in which case, a small torque is given to the starter, and, at the same time, the plunger is drawn up the bore of the solenoid and the pinion is slid into engagement by means of the pinion-shift lever. When the plunger has moved through about half its stroke, at which time, the pinion is well in mesh with the flywheel teeth, it bears on a push rod, the end of which protrudes through a hole in the end of the solenoid yoke. The moving contact of the starter main switch is spring mounted on to this rod, on completing the stroke, the plunger firmly closes the main switch contacts thereby fully exciting the motor windings. (See sketch (1) & (2). Cont'd..... | ||