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).
Pages from a manual describing the 'Spontan' transmission system's components and operation.
| Identifier | ExFiles\Box 41\4\ Scan045 | |
| Date | 21th September 1931 guessed | |
| SPONTAN The driven sleeve 26 is connected to the propeller shaft and carries a flywheel shaped as a drum for the transmission brake 22. The annular space between the two sleeves contains in a roller cage 19 two sets of rollers 17, forming the inner clutch referred to on page 8. Fig. 14 shows the combined propeller shaft flywheel and brake drum with the roller cage and some rollers in place on the projecting inner sleeve. Fig. 13. Fig. 14. 20 SPONTAN Again referring to Fig. 12, 18 shows the reaction clutch rollers and 16 the outer or reaction sleeve which carries the pendulum wheel 11, and is anchored to the gear casing by means of six springs 12. The inclined working surfaces for the rollers on the inside of the outer sleeve can be seen on Fig. 15. Fig. 15, where the internal parts are arranged so as to show the pendulum wheel with its anchor springs, the sleeves and the roller cages. The outer roller cage 24 in Fig. 12 is shown separately with a few rollers in place by Fig. 16. As mentioned on page 10, reversing is effected by turning the roller cages in relation to the sleeves, thus bringing the rollers into contact with the desired set of inclined surfaces. To reverse the car the driver must pull the manœuvre pedal slightly upwards from its normal (brake-on) position. In raising the pedal he causes a springloaded pawl to engage with a ratchet wheel; then when the pedal is depressed again the ratchet wheel turns one sixth of a turn. By means of two gear wheels, visible on Fig. 15, this movement is trans- 21 | ||