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).
'India' front axle brake levers fouling the axle during brake application.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan85 | |
| Date | 23th May 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs{Lord Ernest Hives - Chair}/RmL/LG23.5.25. ORIGINAL To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} EY. c. to Wor.{Arthur Wormald - General Works Manager} S E C R E T. 'INDIA' FRONT AXLE BRAKE LEVERS. X8420 X.5420 We find that on 'India' the two small operating levers on the front axle, G.51790, will become choc-a-bloc with the axle whenever the brakes are applied with any force. It is impossible to prevent this happening unless the shoes are set so that the brakes are permanently rubbing. We applied a load on the brake rope operating this lever with the car stationary, having previously adjusted the shoes so that they were just clear of the drum and no more. We found that a load of 240 lbs. on the rope was sufficient to cause this lever to foul the axle. We observed that the drum sprung approximately .025" at the shoe centre during the test. We repeated the test on an EAC. axle. We found that the movement occasioned by springing at the end of the corresponding lever on this axle was 1.1" for a 400 lb. load. This lever having a considerably greater range of movement than that of 'India' it did not foul the axle. It will be observed from the following figures that the spring due to unit load, is greater on 'India' than on the EAC. We are analysing the lost movement in the linkage to account for this. contd :- | ||