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).
The design and effects of different steering pivot geometries, including transverse and longitudinal rake.
| Identifier | ExFiles\Box 178\1\ img109 | |
| Date | 13th July 1926 guessed | |
| - 10 - The maximum transverse rake adopted in practice is about 8°. SKETCH A.{Mr Adams} TRANSVERSALLY RAKED PIVOTS. Y. DISTANCE THROUGH WHICH PIVOT IS RAISED WHEN ROADWHEEL TURNS THROUGH 90° (c) Vertical pivots. The advantage of vertical pivots is that when used with disc wheels to give centre-point steering, the radial loads on the pivot bearings are very small. The disadvantage is that it is impossible to get anything approaching centre-point with any but disc wheels. (d) Longitudinally raked pivots. This is illustrated in Sketch B. The object of this is to promote self-centering by giving a castoring effect to the steering. It will be observed that when steering on a lock, the inner side of the car is raised and the outer side lowered slightly. In practice the pivots are leaned back at the top. The angle required to give self-centering seldom exceeds 3°. If too much castoring lean is adopted, the steering will become heavy and the tendency for low speed steering wobbles be increased. If too little, general instability, and lack of self-centering must be expected. contd. | ||