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).
Four-wheel brake axle control system designed to overcome 'jaggers' and improve braking characteristics.
| Identifier | Morton\M20.3\ img024 | |
| Date | 16th June 1924 | |
| B.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to K.{Mr Kilner} DA.{Bernard Day - Chassis Design} c. to EY. WOR.{Arthur Wormald - General Works Manager} Expl. No. 9940 S E C R E T FOUR WHEEL BRAKES - AXLE CONTROL. We have made use of the device which we made for a torsional damper for the front axle as shewn in our report Hs{Lord Ernest Hives - Chair}4/LG2.6.24., as a parallel radius rod control, using the rear half of the spring to form one rod. The fixed rod was slotted so that there was free movement for ordinary spring action but the slot in the rod was made so that the axle could not twist forward more than 1°. We tried with these rods on and off, and we found that they would definitely overcome jaggers. They also definitely improved the car as regards the following features which are effects likely to be apparent when braking on the front wheels :- (1) Steering affected by unequal braking. (2) Steering taking charge if brakes are applied on a corner. (3) Reduce the 'nod' effect on the passengers just as the car comes to rest, owing to the wind up in the front springs. (4) Reducing the necessity of increasing the stiffness in the front springs. The scheme we used may not be practicable owing to the increase stress on the rear half of the front springs. The arrangement might be reversed and use the spring as a tension member and a tube as a compression member by fixing the front end of the spring. Hs.{Lord Ernest Hives - Chair} | ||