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 report on checking component parts of a Bentley rear axle pinion drive to find the reason for cage failures.
| Identifier | ExFiles\Box 84\4\ scan0170 | |
| Date | 31th March 1937 | |
| HFR/EW. TEST REPORT NO. 749.B. REPORT ON THE CHECKING OF COMPONENT PARTS OF A BENTLEY REAR AXLE PINION DRIVE. OBJECT OF TEST: To try and find a reason for the cage failures in the front row of a 5/MDJT.30. GENERAL REMARKS: Read in conjunction with Drg.No.TR.{Capt. F. W. Turner - Finance}73. 1. The casing as received was mounted with the companion flange resting on a flat surface. Casing was revolved and readings taken by means of a clock gauge between each stud. For results see Fig.A. marked *. 2. Figures were now taken on the face of the companion flange near O.D. and near recess. See Figs. A.{Mr Adams} and B. for out of truth and convexity. 3. Out of truth of collar on pinion shaft (mounted in housing and casing) - Figs. C. and D.{John DeLooze - Company Secretary} Out of truth of roller bearing inner - fig. E.{Mr Elliott - Chief Engineer} 4. Pinion shaft, fig. F.{Mr Friese} 5. Bearing housing, Fig. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6. End Cap, fig. H.{Arthur M. Hanbury - Head Complaints} 7. 5/MDJT.30 inner, mounted on pinion. Fig. J.{Mr Johnson W.M.} 8. The thicknesses of bearing, housing, flange, D.A. and packing piece on the studs were within .0005" and thickness of small inner distance piece within .00025". 9. Aluminium Housing. Refer to fig. K.{Mr Kilner} 10. No evidence of cross tracking in either race, with or without spigot bearing in position. CONCLUSIONS: The errors in the components as described may have accumulated on the assembly and be contributory to the trouble, but individually these errors are not excessive. The actual cause of cage wear appears to be due to lack of lubricant and from an examination of the whole job it would undoubtedly improve matters if the scheme of lubrication supply were re-arranged to lead oil into the front of the bearing and out the back. Copies to: [redacted] | ||