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).
Servo drum and free wheel designs for a braking system, and progress on the 'Swallow' and 'Goshawk 11' chassis.
| Identifier | ExFiles\Box 30\6\ Scan122 | |
| Date | 19th September 1927 | |
| Contd. -3- R12/G22.1121. of the four brakes. (B2) To avoid this trouble I arranged that the servo drum should be driven from the chassis by two ratchet drives, so geared to run in opposite directions, so that whichever is going in the correct direction carries round the servo drum in the direction of putting on the brakes. This is all right and can be worked out reasonably, but there is the one fault that the free wheel will either make a noise or it will be unreliable. (B3) To avoid the noise of the free wheels one supposed they might be immersed in oil, but another way is that the pinion driving the two wheels shall be connected to its shaft by a small plate or other friction clutch put in the foot pressure. The sketch shews the general arrangement of parts. (B4) It is our intention of trying to work this scheme without the clutch mentioned in (B3) because we believe we can get the one free wheel not generally in use quite silent either by oil or friction control, or use one of the many silent forms of ratchet. I hope this will interest you, and you will let me know in what order you would like the work to proceed. We are now just on the point of being able to send Derby a design for this part of the work which concerns the front axle. Concerning the "Swallow" one might imagine that we are also well on with this, being about half way through. Owing to preliminary work done, and that done for Goshawk 11., this chassis ought not to give us much further trouble, but we never really know until one has done the work. For instance, the steering gear has worried us muchly to know what style of operation it shall take. R.{Sir Henry Royce} see original for sketch. | ||