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).
Technical specification for a vehicle's braking system, detailing the front, rear, and servo mechanisms.
| Identifier | ExFiles\Box 120\2\ scan0327 | |
| Date | 10th June 1938 | |
| -2- RM{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}1/MH.{M. Huckerby}10.6.38. Front Brakes. Hydraulically operated by the pedal without any servo assistance. The hydraulic cylinder should be inside the brake drum and the 'Huck' type brake used, similar to SCD.148 only with our standardised brake shoe section and brake drum. Rear Foot Brake. Girling type with anti-wrapping link operated by mechanical servo only. (No change in brake unit design). Rear Hand Brake. The hand brake is coupled to the same set of rods as the foot brake (no design change). Servo. The servo will be of the same general design as B.III, the servo cams in addition acting as the equalizer between front and rear brakes. The cast iron driven disc should have formed on it an eccentric with chilled surface, bearing against a roller mounted on a lever which operates the rear brakes. The object of this is to eliminate geometry errors, several pin joints which are apt to rattle, and to enable the servo to run at double speed with the result of halving the load on the worm wheel and servo cams and giving increased natural cooling. As only one set of brakes are servo operated the loads are again halved and there should be little difficulty in making the new servo stand up under these conditions. It should be possible to balance the pedal input against the servo output load and thus have no load on the gearbox. Advantages in this scheme. Apart from considerable simplification there are several decided advantages in this scheme. (1) The direct braking (to front) is sufficiently powerful to stop the car quickly when shunting before the servo has taken up. (.III and B.III are very bad in this respect). | ||