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).
Considerations for engine component lubrication and design modifications.
Identifier | ExFiles\Box 138\1\ scan0087 | |
Date | 15th January 1934 | |
- 2 - E.2/HP.15.1.34. We definitely know that the pulsating pressure load is much more easy to take care of. Naturally we must proceed with caution before adopting any innovations of this nature, and make thorough tests under all conditions of service. With regard to the size of these lubrication holes I am of the opinion that taking the present hole right through the pin will not weaken the shaft any more than now as the final section will be symmetrical. We could of course reduce the diameter of this hole but our first tests should be made with present diameter. With regard to the clearance of the big end, this we think should remain unaltered as it constitutes the main feature restricting oil flow from the pin and if the big end is supplied with lubricant in the right place at the right time we feel the present clearance should be satisfactory. With regard to sludging, the reduced rate of flow occasioned by the use of two holes instead of one may be a disadvantage in finishing with more restricted passage ways formed through the sludge, but this can be watched. With regard to connecting rod lubrication, some shortening of the oil pick up groove in the big end bearing may be required to counterbalance the increased number of pressure squirts of oil picked up from the crankpin. E.{Mr Elliott - Chief Engineer} AE | ||