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).
Instructions for erecting and testing a shock damper bellows control unit.
| Identifier | ExFiles\Box 16\5\ Scan168 | |
| Date | 29th November 1933 | |
| x7520 To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} c. to Sft.{Mr Swift} Hs{Lord Ernest Hives - Chair}/Les.2/KT.29.11.33. x4698 ERECTING SHOCK DAMPER BELLOWS CONTROL UNIT TO RR.SCH.469. In order to prevent straining the bellows and to prevent differences occurring in the minimum load of the damper after the bellows has been compressed, it is important that the range of movement of the bellows should not cause a permanent set in the bellows. The bellows F.85395 should be compressed to solid by hand. The released position is then taken to be the maximum extended position. The cap nut F.85398 on the alum. cover F.85390 is adjusted by means of washers F.85399/403 so that this free length cannot be exceeded. When once this cap nut is set, all alterations to the load of the damper are made by the adjustment washers F.85602 inside the bellows. TESTING EACH SHOCK DAMPER. (1) Maximum Pressure Test. Remove the valve, valve spring, bellows and the alum. cover. Fit a solid H.P. valve with a temporary alum. cover (Hs.{Lord Ernest Hives - Chair}1222). This is done so that the H.P. chamber and L.P. chamber can both be pumped up to an equal high pressure without damaging parts of the damper. The filler plug should be removed so that the oil reservoir part of the damper does not build up the same pressure. The plug F.10097 is now replaced by an adaptor enabling a pressure of 2,500 lbs/sq.in. to be exerted in the high and low pressure chambers. This is equivalent to 500 lbs. ball pin load, so should be adequate to allow for the pressure velocity effect on the top of the maximum damper load. This test should detect any faulty casing or valve chamber jointings. (2) Minimum Ball Pin Load. This should be set to 30 lbs. for both front and rear dampers. The load being obtained by the adjustment washers F.85602. (3) Maximum Ball Pin Load. With a pressure of 30 lbs/sq.in. behind the bellows the ball pin load should be approx:- Front 400 lbs. Rear 300 lbs. The pressure behind the bellows should at no time exceed 35 lbs/sq.in. Leaks can now be checked round the bellows jointings. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||