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 cause of seizing of the dynamo drive pinion bush due to an oil splash lubrication issue.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan144 | |
| Date | 30th August 1928 | |
| To R: from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}/ACLl/LG30.8:28. 'SS{S. Smith}' ENGINE. X7685 / X7100 We have made further investigation of the cause of the seizing of the dynamo drive pinion bush by running the engine with the timing case cover removed and observing the course of the oil splash from the gears. We find that a stream of oil is thrown off the cam wheel and dynamo drive pinion at the outer edge of these gears only, the reason being apparently due to the direction of rotation and angle of the helix of the gears. This stream of oil completely misses the small deflector (E.77470) whose purpose is to drain the splashed oil into the small trough in the bearing housing and so conduct it to the inside of the plain bronze bush. The appended blue print is given to illustrate this. we have therefore, for the purpose of experiment, deleted this deflector and substituted a small trough-shaped deflector attached to the timing case cover and having a gentle slope to the trough in the bearing housing in the hopes that this will collect the oil thrown from the outer edge of the gears and conduct it to the required part. At the moment we have not run sufficiently long with this experimental part to state whether this satisfies the lubrication requirement of the bearing which, as we previously reported, has been made with a spiral oil groove. We have not so far experienced trouble with any contd:- | ||