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).
Design of piston pin retaining circlips for 'China' chassis.
| Identifier | ExFiles\Box 105\2\ scan0198 | |
| Date | 4th May 1929 | |
| X. 3040 R1/M4.5.29. BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to Hs.{Lord Ernest Hives - Chair} RG.{Mr Rowledge} PISTON FOR 'CHINA' CHASSIS. --------------------- We send you herewith LeC.2698 shewing the 3.25" dia. piston for 'O' series of twenties. The piston pin is retained by circlips and I have schemed that these latter shall be just plain spring rings without g fancy ends so that there will be more chance of getting them right. These clips must be circular when in position, which means that when free the radius of curvature will alter from a minimum on the horns to a maximum opposite the split. The required shape should be determined to suit the conditions of load specified on the drg. We calculate that at 4000 r.p.m. of the engine the max. stress due to the inertia of the circlip is 23,000 lbs/sq.in. in the worst position, and as we expect the set up stresses to be about 60,000 lbs/sq.in. the clip should be quite safe. Four grooves are provided so that the rings can be extracted in any position. For shop use I think a special pair of pliers could be made for removing the circlips. This is an important matter that we must spare no effort to get it as good as we know how. R.{Sir Henry Royce} | ||