Use and modification of wearing plates on rear leaf springs.
| Identifier | ExFiles\Box 80\2\ scan0366 | |
| Date | 22th December 1920 | |
| To B.J. from Hs {Lord Ernest Hives - Chair} /TMW. X.4209 (crossed out) 8.F.C. Hs {Lord Ernest Hives - Chair} /TMW2/LG22.12.20. X.4209 REAR SPRINGS - WEARING PLATES. We beg to reply to the three points mentioned in your BJ2/H21.12.20. 1. Wearing Plates have always been fitted to the thick leaf springs whether split or solid. There are two reasons for their modification:- (a) We now fit the solid leaf spring where it used to be split and the side movement was controlled by a collar on the roller standing up in the split. (b) The plate at present fitted is narrower than the leaf itself with the result that, with the spring being of a softer material, it is wearing away at the sides and causing a knock when under side stress influence. 2. We are recommending in future that these modified wearing plates should be fitted on all springs in order to obtain the maximum hardness of surface operating on the roller. 3. We are about to fit a similar spring to that which we used before the war and although complaints were not received on test of this knocking, there is no doubt that it must develop with wear; also we have probably become more critical. We did not fit wearing plates on this type of spring previously because the second leaf so nearly overlaps the bottom one resting on the roller, that even if the spring should become so worn at this point as to break, the second leaf would rest on the roller. The hardened surface of the plate is preferable however. We are, therefore, recommending the adoption of these wearing plates for reasons of good wearing qualities and quietness. Hs {Lord Ernest Hives - Chair} /TMW. [STAMP: E.F.O. DEC 28 1920 RECEIVED.] [FOOTER (upside down): R.R. 199 (2501) (SD676 19-7-17) MP 180865] | ||
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).