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 friction losses in the E.A.C. steering box.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan46 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS{Lord Ernest Hives - Chair}/ACL/12-6-25 FRICTION LOSSES IN THE E.A.C. STEERING BOX. We have analysed the principal friction losses in the standard EAC. steering box and have obtained values for the efficiencies of the following units :- (1) The nut and screw - the nut was whitemetal lined and lubricated with Prices 'C' oil which is the lubricant used in the box. (2) The cheeses with the same lubricant as above. (3) The rocker shaft bearing. The apparatus for the above tests was so arranged that these units were subjected to exactly the same conditions of load, both in magnitude and direction, as when forming the complete unit in position on the car. The loading was equivalent to a tension in the side steering tube of approx. 250 lbs. which is the load we have registered when the car is steered closely round a right angled corner at a speed of about 20 m.p.h. The appended print shews the type of apparatus and the method adopted in carrying out these tests. A twisted movement was applied to the nut through the two cheeses and the load lifted was also carried by the cheeses which were subjected to both the torque and the resulting axial thrust in exactly the same way as when forming the complete unit in the box. It was therefore possible to obtain readings for the torque required to produce a given axial, thrust and the resistance to rotation of the cheeses in the nut. contd : | ||