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 required range of movement for hydraulic shock dampers on the rear axle.
| Identifier | ExFiles\Box 55\3\ Scan161 | |
| Date | 8th May 1926 | |
| X235 c. Hs. {Lord Ernest Hives - Chair} BY1/H. 8.5.26. HYDRAULIC SHOCK DAMPERS ON REAR AXLE. ------------------------------------- In order to make quite clear the need for large movements on the shock damper fitted to the rear axle, I am sending you herewith a sketch of the Hartford Shock Absorber showing axle positions:- a {Mr Adams} /- static action conditions under ordinary load. b/- the position of the shock damper when the axle rebounds to 16.075" buffer clearance. It should be noted that even this is not the final limit, as the axle is held at this particular dimension owing to the fact that the Hartford Shock Damper then becomes an axle tie.. it would appear that the axle would go even further than this as a result of being driven fast over a hog-back bridge. when fitting the Hartford Shock Damper originally, we took a great deal of care to fix the best possible range of movement, and even at that we were aware that under extreme conditions it would be possible to extend the scissors of the shock damper into a straight line, and as a matter of fact we actually did this by driving fast over a small bridge on a straight stretch of road. since then we have had one or two occasions in service when the same thing has happened in the hands of customers, so that it is quite certain we must make provision in one of two ways:- 1. Ample provision in the shock damper itself to cover any possible contingency. 2. Limit the movement of the axle. BY. {R.W. Bailey - Chief Engineer} | ||