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).
Page detailing the periodic action of spring and friction forces, likely within a braking system.
| Identifier | ExFiles\Box 30\6\ Scan173 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} -2- EXPERIMENTAL REPORT. Expl. No. 9940 REF:Hs{Lord Ernest Hives - Chair}/ACL/LG25.1.24. of the spring becomes greater than the frictional force between the drum and the shoes. Slip will take place. (3) As soon as slip takes place the co-efficient of friction will drop to a lower value and the energy stored in the deflected spring will cause it to rebound torsionally at the same time it will lose potential energy or its capacity to resist rotation of the brake shoes with the drum. This will fall until the friction force is greater than the resisting force and partial locking again takes place, the co-efficient of friction returning to its higher value. This action would be periodic. The conditions for above are :- (1) That the operating force is applied suddenly and assisted by wrapping, the drum is rapidly locked to the shoe when the spring is in the undeflected position. (2) That slip does not take place between tyre and road. (3) That the suspension is flexible. SUMMARY. (1) Sudden application of operating force causes resisting torque of spring to run up to a higher value than friction force causing slip at drum. (2) Co-efficient of friction of body sliding lower than when at rest. (3) Energy stored in deflected spring returned in form of kinetic energy. HS{Lord Ernest Hives - Chair}/ACL. | ||