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).
Analysis of torque and shear forces on a vehicle frame under different load conditions, illustrated with diagrams.
| Identifier | ExFiles\Box 26\1\ Scan042 | |
| Date | 19th March 1964 | |
| - 5 - Tln/CJC. 3.FL. 19.3.64 No doubt other arrangements could be devised having more attractive suspension geometry, though with the low rear end weight of a FWD car, the properties of a 0.8 x track swing arm radius might be acceptable. The absence of anti-dive is likely to be less acceptable. If the fairly conventional dimensions of a = b = 60", e1 = 20", e2 = 45" are chosen, the torque about the transverse axis, without load crossing, due to the wheel offsets would be 65W which would increase the inherent torque of 60W due to the presence of a shear W at each corner of the frame. FIGURE 6 60 W DUE TO SHEAR FORCES W ON CORNERS +65W DUE TO WHEEL OFFSETS FROM CORNERS. i.e. twist is associated with a torque of 125W about the transverse axis. If however the rear wheel loads are crossed making We negative and reversing the sign of the shears W on the rear corners of the frame, there is no twist about the transverse axis due to the corner shears and the offset couple torque is only = (45 - 20)W = 25W. FIGURE 7 Continued ............. | ||