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).
Test procedure for a rig designed to test the efficiency of carrying trunnions in the 40/50 steering box.
| Identifier | ExFiles\Box 38\1\ Scan118 | |
| Date | 19th January 1923 | |
| X.3465. To BY & Hs.{Lord Ernest Hives - Chair} from Da.{Bernard Day - Chassis Design} c. to CJ. Wor.{Arthur Wormald - General Works Manager} Da{Bernard Day - Chassis Design}3/M19.1.23. We send herewith N.sch.1371 shewing a rig which Mr. Royce would like made to test the efficiency of a method of carrying the trunnions in the 40/50 steering box. The method consists of a solid rocking shaft with trunnions screwed in and then clamped by a biting-in-bolt. A special flat thread is used. On N.sch.1371 the diameter and length of the thread, and the thickness of the lever are as the actual pieces, but some of the other dimensions are more to suit the testing apparatus. It is intended that various loads should be tried, starting at about 1/4 ton, and gradually increasing if failure does not immediately take place. The test is of course a revolving test, the dummy lever being bolted to the face plate with the axis of the trunnion on the centre line of the lay spindle. Mr. Royce thinks that if the apparatus stands up for two hours with a load of 1/4 ton, that it should be increased at intervals of two hours until failure occurs. We estimate that .7 of a ton gives the maximum load to which this apparatus is subjected on the car, and consequently we should not expect it to stand up for very long with this load at the rapid rate of reversal which it would undergo in this test. Da.{Bernard Day - Chassis Design} | ||