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).
Calculations and suggested experiments for a cross steering tube ball joint.
Identifier | ExFiles\Box 80\1\ scan0027 | |
Date | 22th April 1916 | |
2. Cross Steering Tube Ball Joint Contd. You will notice that, on LeC.540 I have calculated the stresses and pressure, on the shank, for a press-in allowance of .050. These stresses look high, but we think they may be advisable in order to so hold the sphere that it will break off at the neck rather than work loose. However it would be well to make a few experiments as follows, with a view to determining whether .025 press-in allowance is enough. A smaller allowance than this would be inadvisable, because of variations caused by error of workmanship, possible relatively rough surfaces in the hole &c. EXPERIMENTS SUGGESTED. Each Experiment Should Be Conducted At Least Twice. To Check. To find whether the sphere, as redesigned, will more readily break or work loose, and also to compare it with the existing flanged design we suggest the following experiments. Exp. 1. (a) Hand forge a rough steering lever with a deep boss as LeC.537, and strong enough not to break off itself during experiment, but sufficiently flexible to closely represent, as far as the ball is concerned, the conditions obtaining in the actual drop-forged steering lever. 2 or 3 of these levers might be made of the same material as the steering levers and similarly heat treated. (b) Ream the taper hole and press in the new sphere, one with a .025 allowance, one with a .050 allowance, always finishing the hole carefully before pressing and using the hydraulic press. (c) Fit one of the old type spheres into one of the existing strengthened steering levers, making (Contd.) R.R. A.{Mr Adams} 288 (T. 400) (S.C.) (15-2-16) C. 1546. | ||