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).
Technical analysis comparing worm and sector versus worm and nut steering systems in relation to shimmy and wobble suppression.
| Identifier | ExFiles\Box 29\1\ Scan113 | |
| Date | 8th October 1925 guessed | |
| contd :- -16- the reversibility increasing at the same time as the resistance to road shocks diminishes. We think it is a good idea to keep as big a multiplication as compatible with the degree of select-iveness demanded of the steering (1/10 to 1/13). (d) Steering Box. We have only experimented with the worm and sector which is the steering of our test car. Some tests made on cars with worm and nut permit us however to make the following statement. Worm and sector steering is worse for shimmy and better for road shocks on the steering wheel, than steering worm and nut. In this latter type, the surfaces of contact are greater and better lubricated which renders the steering more reversible and more sensitive to the least inequalities of the ground. The parts concerned also wear less. The whole is more elastic. The oscillating system, wheels, cross steering tube and side steering tube do not find in the box a point of support as in the case of the worm and sector. The balance of which we speak seems to act in a more disturbed fashion. We are not able to say which is, from the point of view of wobble suppression, the most preferable arrangement. Conclusions - with regard to the steering lock. (1) There is [illegible] a possibility of suppressing shimmy on certain of our modern cars such as the 12 HP: test car by the employment of bushes in the pivot axis and by judicious choice of springs. This is only a palliative because it makes the steering 15 to 20% heavier and its function is limited and certain cars such as - Chenard, Peugeot and Fiat fitted with bushes, shimmy. contd :- | ||