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).
Three problems encountered with the J.III shock damper and conical valve arrangement.
| Identifier | ExFiles\Box 179b\2\ img091 | |
| Date | 11th November 1932 | |
| R.{Sir Henry Royce} From HA/Sn.{Mr Sanderson} c. to SG.{Arthur F. Sidgreaves - MD} Nor. c. to A.{Mr Adams} Da.{Bernard Day - Chassis Design} c. to Ry. He/Rs.{Sir Henry Royce's Secretary}4/WA.{Mr Wallis}11.11.32. J.III SHOCK DAMPERS. VALVE ARRANGEMENT D.N.421.3427. V5720 The three problems encountered on this damper since fitting the conical valve with the disc head are:- (1) To silence the valve without producing so much resistance from the damping disc that it affected the load when the oil was cold. (2) To arrange the air vent at a lower level than the existing one feeding the bearings, otherwise as soon as the oil level falls the air vent lets air into the working cylinder. (3) To get satisfactory results from the Governor automatic control. (i) Indicator diagrams 1 to 6 show the best compromise obtained so far. The low pressure diagrams are affected slightly by temperature at the highest speed, the high pressure also. Diagrams 4 & 6 show the effect of the oil on the damping disc. In 4 the thick oil had not completely filled the chamber behind the disc. After heating, however, it passed the head and caused the increase in pressure velocity shown in 6. After the damper has once been run diagrams 3 & 5 become the normal ones. The shorter stroke diagrams are very satisfactory except for the slight loss of efficiency when running at the highest speeds at the highest temperatures. We have tried various schemes for overcoming the trouble, including a passage to the atmospheric chamber from each side of the nat. Diagrams 7 - 12 show the short strokes, and by comparing 3 & 11 the small | ||