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).
Front axle braking torque damping.
| Identifier | Morton\M20.3\ img012 | |
| Date | 20th March 1924 | |
| R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. Expl. No. 9940 REF: Hs{Lord Ernest Hives - Chair}/ACL/L62. 6. 24. EXPERIMENTAL REPORT. EXPERIMENTS ON FRONT AXLE BRAKING TORQUE DAMPING. The apparatus was arranged as in attached print. The axle was not rigidly held against torsion but constrained only by the friction of the sliding plates. The frictional resistance could be adjusted by the clamping bolt. With the arrangement shown, very little resistance would be offered to vertical deflection of the axle. Experiments were carried out to observe the effect of frictional resistance to axle torsion upon jaggers. - The tension on the friction plates was adjusted until jaggers could not be obtained. The friction force at the friction plates was found to be approximately 700 lbs. and assuming that the twist of the axle was centred at the centre of the spring the frictional force would be acting at a radius of 6.75" or give a resisting torque of 4725 lbs.ins. at each side of the axle. The total axle twist under these conditions was measured and equal to 2º 18'. If the car was stopped with the brake on, the axle would remain twisted forward but with the brakes released it would resume its normal position after a short run. The tension of the plates was reduced until jaggers could be obtained. The frictional force was then approx. 450 lbs. giving a resisting movement to twist of 3040 lbs.ins. at each end of the axle. When jaggering took place under these conditions the amplitude - or total deflection of axle - was found to be 5º 30'. It was found that before contd:- | ||