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).
Calculation of spanner and driving torques for a clutch system considering friction.
| Identifier | ExFiles\Box 10\4\ 04-page33 | |
| Date | 10th February 1938 | |
| HE/DRY.2/AP.10.2.38 Direct Drive Clutch Assume coefficient of friction of both cones and the thread to be /u. To obtain an end load P, requires a spanner torque sufficient to overcome the friction of the outer cone and the thread. Neglecting the movement up the cone which is small and assuming the nut to have square threads- The spanner torque is - P/sin 10 * /u x 2.150 + P * /u x 1.750 = 14 P /u Case (1) The torque driving the car is that of the inner cone + that of the thread, namely - P/sin 30 * /u x 2 + P * /u * 1.750 = 5.750 P /u Case (2) The inner cone alone driving the car with a torque of 4 P /u. continued | ||