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).
Providing reverse drive and the advantages of a specific clutch type for a constant-mesh gearbox.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 106 | |
| Date | 10th August 1926 guessed | |
| - 8 - to zero and complete unclutching will be the result. But if the inner and outer members are pressed axially together by means of a spring it will be found that there is a resistance to unclutching, the magnitude of which may be regulated as desired. In practice it is always small. 6. Provision for reverse drive. In certain circumstances it is desirable to be able to interchange the driving and driven shafts, e.g., when, on going down a steep incline, the engine of a car is actually used as a brake. Provision can be made for this by using the biconoidal form of Humfrey-Sandberg clutch as in fig. 6, the two conoids belonging to the outer member being slightly telescoped so that, in the symmetrical position, neither engages, and the clutch is free in both directions. By shifting either member axially in one direction or in the other the upper or lower halves of the rollers in fig. 6 can be engaged and the drive of corresponding sense obtained. Or the two conoidal halves may be entirely separated, each being provided with its own set of rollers as in fig. 7 where, if the clutch on the inner member be pressed towards A, the inner member will drive and the outer "free-wheel" in the sense shown by the arrow, but, if the clutch on the inner member be pressed towards B, the outer member will now drive and the inner "free-wheel" in the sense shown by the arrow. 7. Advantages of this type of clutch for the particular application to a constant-mesh gearbox. This clutch has the following advantages if applied to a constant-mesh gearbox for use e.g. in a motor | ||