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 car engine suspension and mounting to reduce vibrations.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan169 | |
| Date | 7th May 1931 | |
| HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} LHS.{Lord Herbert Scott} C. to DY.{F R Danby} HY.{Tom Haldenby - Plant Engineer} EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL CAR ENGINE SUSPENSION. EXISTING P. 2. & J.{Mr Johnson W.M.} 1. R2/M7.5.31. 87005. 85005. x634. We are just completing the design for the front central engine support, as something towards the best approved mounting. We want to keep clear of the frame near the dash but we fear this cannot be done on J.{Mr Johnson W.M.} 1., but will be a feature of converted P. 2. We are all agreed that our old torque reaction dampers as far forward as possible are of great importance, and we ought to have soft rubber (unloaded with engine weight) to tell the engine where it should be. This in P. 2. will be the front engine feet, and J.{Mr Johnson W.M.} 1. will be the existing engine feet modified for soft rubber (diabolo.) It is now agreed that engine mounting is probably all we can do to 6 cyl. engines, and with the damped diamond mounting frame jellying is thought to be not seriously worse than with 4 sandwich feet. Torque reactions are reduced, and booms are almost absent from the engine. Finally the boom period is either frame or body, not engine, but over-running vibrations, which are natural to all 6 cyl. engines, excite them at their own period, long thought to be the engine, but cannot be found as a period of the engine. Every 6 cyl. engine has - Torque reaction impulses. Piston impulses (over-running vibrations,) which will start any periodic vibration it can reach, and we have only been able to insulate these impulses from the frame in the way stated. All experience has shewn the enormous value of damping, first applied to the 6 cyl. crankshaft of our early 30HP. in 1906., and now helping us at so many points to make a good car. R.{Sir Henry Royce} | ||