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).
Gear teeth friction, pinion engagement, and potential improvements to motor armature windings.
| Identifier | ExFiles\Box 179\2\ img284 | |
| Date | 27th February 1932 | |
| -2- With regard to the other difficulty of gear teeth friction, this is a function of the armature torque on the teazer winding and we consider that if our pinion and flywheel gear ring teeth were made slightly helical the helix being at the right angle to agree with the natural resultant motion of the pinion, engagement would be improved and disengagement more rapid and certain. We have had two cases where the armature windings have lifted due, we consider, to the motor not coming out of gear fast enough when the engine has started on a cold morning (one of these cases occurred in U.S.A. this winter). The helix would only have to be very small, as above a critical angle the motor would not hold satisfactorily in engagement when turning the engine normally, 5 to 10° should be suitable as an experiment. The armature damper on these motors we have found to be very reliable and the quietening effect on engagement and disengagement is a considerable improvement over the Bosch. Hs{Lord Ernest Hives - Chair}/met. P.S. It has since occurred to us that the problem of obtaining extra longitudinal force on the teazer circuit without increasing the armature torque and therefore the gear teeth friction, could be accomplished by splitting the teazer field winding into two parts, one series and the other shunt. A strong pull would then be obtained with a small turning torque. | ||