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).
The analysis and calculation of leaf spring plate lengths, stiffness, and stresses.
| Identifier | ExFiles\Box 43\2\ Scan201 | |
| Date | 28th September 1937 guessed | |
| - 6 - Plate Lengths. Our first trouble was that the spring when supposed to be flat actually bent thus:- We were working on the old Sheldon Co. plate lengths. Also the stiffness was much higher than calculated. We believed we had excess metal in the spring and calculated the plate lengths on the following assumptions:- (1). The bedding point of each plate with the next above was assumed to be 3/8" from the tip. This was after much verification by trial with blued leaves. (2). 2 1/4" at the middle of the spring was assumed to be clamped out of action by the axle clamp. Thus L, was taken as 19.750 instead of 21.000 L2 was taken as 21.250 instead of 22.500 (3). It was required that each leaf should make contact with the next below (point A) at such a distance from its bearing point with the next above (point B) that its maximum stress was attained at point A.{Mr Adams} [DIAGRAM DATA] W1, POINT B, POINT A Dimensions (bottom): 1.190, 1.870, 1.580, 1.580, 1.580, 1.580, 1.200, 1.200, 1.200, 1.210. Total: 19.750 Dimensions (right): .285, .250, .215, .187 The load at the eye (W1) is increased above the calculated flat load in the portion 21/19.75 by clamping to the axle. The stresses when flat can be calculated as shown above. | ||