Rolls-Royce Archives
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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).
Tests and recommendations for improving servo efficiency and brake operation consistency through various modifications.

Identifier  ExFiles\Box 16\3\  Scan070
Date  24th June 1929 guessed
  
-2-
with its efficiency restored by using 30° cams.

Curves Y.680 were the average of agood many tests and indicate that the servo operation is much more consistent when the friction linings are soaked in oil. This is confirmed on the road, the consistency of brake operation under conditions of varying temperature and atmosphere being excellent.

Tests were also carried out to see if the servo efficiency could be improved by polishing the driving pins and in a further test, ball bearings were actually fitted to the driving side of these pins. It will be seen that an appreciable gain is recorded with polished pins (curves 6 & 7) but little further increase was recorded with the ball bearings.

It would appear that the main point is to avoid corrosion on these pins. This we have occasionally run into on cars in service.

Mr. Olley has recommended ball bearing thrust cams. for servo motor. Curves 6 & 7 shew the advantage in efficiency from this modification that we have measured in our test.

This test compared dry cams with ball bearing cams. When the cams are regularly lubricated as on the present cars, the difference is less marked, infact it is almost impossible to detect any improvement on the road.

We recommend that the 20 HP. servo cams., swinging arm etc., should be lubricated from the central system as on Phantom ll. At present we have to rely on hand lubrication for these parts.

Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
  
  


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