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).
Investigation into the distortion of rear brake carrier plates on chassis 30-EX and 35-EX due to heat generated by the brakes.
| Identifier | ExFiles\Box 92\4\ scan0191 | |
| Date | 14th August 1936 | |
| X306 To from RHC.{R. H. Coverley - Production Engineer}/RH.{R. Hollingworth} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHC{R. H. Coverley - Production Engineer}/RH.{R. Hollingworth}2/AP.14.8.36. Martindale What is all this about? Rm{William Robotham - Chief Engineer} Ph.III. REAR BRAKE CARRIER PLATES. Trouble has been experienced recently on 30-EX. and 35-EX. Chassis due to distortion of the rear brake carrier plates and dust excluders, as a result of which a test has been conducted to substantiate the fact that heat generated in the brakes is causing a permanent distortion. 30-EX. Chassis received in shop after Brake Test on road, for examination of Rear Brakes. The off-side carrier plates were found to be distorted and dust excluder badly buckled (See Ex.I.50). The extremities of the inner and outer carrier plates which support the brake shoe toggle shafts and fulcrum pins have moved bodily towards the open end of the brake drum to receive a permanent set of .100". The section of the carrier plate which supports the bell crank levers has also received a permanent set in the same direction but of less degree. Toggle shaft bearings were practically seized due to mis-alignment. Dust excluder was badly buckled outwards away from the brake drum, on sections where it is not supported by the carrier plate. The brake drum has also been fouling the inside of the lip of dust excluder on several places (See. Ex.I.50) Near side brake not stripped. ----------- 35-EX. Chassis received in shop for re-lining brakes in S.5805 Ferodo using Tinnans headed solid copper rivets. The off-side carrier plates were found to be distorted .025" on that section which supports the foot brake toggle shaft in a direction towards the inside of the brake drum (See Ex.I.51.). No distortion was found on the section which supports the hand brake toggle shaft. continued. | ||