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).
Starter motor operation, detailing issues with armature sticking, tooth chipping, and improvements to the system.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan082 | |
| Date | 4th June 1929 | |
| -3- reduction gearing as good B.H.P. and efficiency as obtained on one of the first similar motors on the spindle. The motors on chassis are giving good power and starting torque and running nicely as regards commutation. Starter operation. __________________ Generally speaking, engagement, starting and disengagement, is taking place satisfactorily on production chassis. The sticking of motor armatures was early eliminated, though there has been a little trouble, now overcome, due to tightly meshing teeth, and also due to chips from the teeth getting into the main bearing mainly as a result of incorrect operation by testers before getting used to the new system. Hy.{Tom Haldenby - Plant Engineer} has improved the wheel material, and the teeth of the wheel have been backed off slightly to minimise corner chipping of wheel teeth at disengagement. The pinion remains as arranged some time back, i.e. sharp engaging corners, rounded disengaging corners and backed off. There is no failure of the motor to return, so that when all is O.K. the only failure is the occasional partial one of a "corner jam" which is overcome by a second push of the button. The present standard main armature return spring is the one of the long low rate type called Z, and referred to in our EFC2/AD4.6.29, but it is doubtful if this is quite the best spring for the purpose. There is sometimes | ||