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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).
Failures of the front axle control damper levers and main lever key-way during bumper testing.

Identifier  ExFiles\Box 16\4\  Scan031
Date  11th November 1928
  
To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
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}
X7520
hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}3/LG13.11.28.
FRONT AXLE CONTROL DAMPER. X7420
We have broken three or four of the levers in the front axle dampers as shewn in the attached sketch. This occurred on the bumper test.
We have also sheared the key-way of the main lever, on the shock absorber shaft.
We have never broken either of these pieces on the road but we have had one or two cases where the small lever has been found to be loose on the square when dismantled. This has only occurred on the front axle dampers.
It appears to us that one reason for the trouble we are having with these levers may be that the transmission load to the axle is now more rigid as the control damper main lever is a larger section in the original shock absorber 7 1/2" lever.
The other point in the original front axle, the velocity of the axle movement was 4.26 times the piston velocity. In the axle control damper it is 4.71 times the piston velocity. Hence the pressure velocity effect of the high pressure passage is decreased.
It appears that we may experience trouble in service if we do not strengthen the parts in question. We cannot reduce the load because of high speed wobbles.
Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
  
  


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