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).
Report analyzing steering friction values for different axle pivot configurations and spring load setups.
| Identifier | ExFiles\Box 67\3\ scan0033 | |
| Date | 26th January 1927 guessed | |
| -3- Contd. |-------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------| | | | | CONDITION OF AXLE. | LIMITS BETWEEN WHICH THE FRICTION IN THE STEERING WILL LIE. | | |----------------------------------------------------------------|--------------------------------------------------| | | Stationery | Normal running | | | Wt. on pivots. W. | Wt. on pivots W/2. | |-------------------------------------------------------|----------------------------------------------------------------|--------------------------------------------------| | Standard pivots. | | | | Spring loaded cross | 775 ins.lbs. | 575 ins. lbs. | | steering tube. | | | |-------------------------------------------------------|----------------------------------------------------------------|--------------------------------------------------| | Three plate friction. | | | | 825 lbs. spring load. | 520 ins.lbs. | 520 ins.lbs. | |-------------------------------------------------------|----------------------------------------------------------------|--------------------------------------------------| | Three plate friction. | | | | 600 lbs. spring load. | 650 ins.lbs. | 520 ins.lbs. | |-------------------------------------------------------|----------------------------------------------------------------|--------------------------------------------------| | Three plate friction. | 950 ins.lbs. | | | No spring load. | Stiffens up when | 475 ins.lbs. | | | shunting. Re- | | | | jected for this | | | | reason. | | |-------------------------------------------------------|----------------------------------------------------------------|--------------------------------------------------| From this it will be seen that there is not really a very large discrepancy between the results obtainable with the spring loaded cross steering tube and the shunted pivots. The fact remains, however, that the difference is quite appreciable on the road, though possibly this is due to some factor the significance of which we have missed. Our original estimate of 340 ins.lbs. about the pivot as the maximum friction required in the cross steering tube was undoubtedly on the low side but proficiency in the manufacture of the low geared worm and nut has produced free steerings. The one other difficulty that we encountered with this friction in the pivots was that unless the plates Contd. | ||