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).
Novel patented combinations for hydraulic shock dampers to improve car suspension.
| Identifier | ExFiles\Box 55\3\ Scan049 | |
| Date | 13th February 1926 | |
| To DA. {Bernard Day - Chassis Design} RG. {Mr Rowledge} E. {Mr Elliott - Chief Engineer} HS. {Lord Ernest Hives - Chair} BY. {R.W. Bailey - Chief Engineer} FROM R. {Sir Henry Royce} LE CANADELHenry Royce's French residence. 4235 R1/M13.2.26. c. to CJ. BJ. Wor. {Arthur Wormald - General Works Manager} MR. Claremont. HYDRAULIC SHOCK DAMPERS. X.235 X.8520 I think these should have prompt attention as they are urgently wanted on the cars to improve the suspension. They are certainly the most important feature of the car at the moment, at any rate on such rough roads as one finds in France. How will they do this? Firstly, I hope they will permit the safe use of semi-balloon tyres at about 30/35 lbs./sq.in. (possibly also lighter and modified axle would be needed in extreme cases.) Secondly, owing to constant action, gentle in one direction and vigorous in rebound, they should steady the car without making it harsh (avoiding some cases of sickness). The combinations that are novel, which we have produced should be patented. They are :- (1) Forced filling of the suction side of the cylinders by the fluid passing the spring loaded blow off valves of the pressure side. (2) Arranged for double action, controlled by spring loaded relief valves which are set for any desired equal or preferably unequal effect. (3) The use of replenishing inlet valves to each end of the cyl., with one restricted outlet (preferably on the low pressure side) at the highest point of the pressure passages, to discharge any air that may be in the system. This outlet may be fitted with non-return valve. I have telegraphed Derby as follows :- "Arrange the restricted vent belonging to the low pressure side at highest point of passage fit this with non-return ball valve". contd :- | ||