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).
Thrust tests of a Goshawk bevel pinion thrust bearing.
| Identifier | ExFiles\Box 6\1\ 01-page001 | |
| Date | 18th February 1926 | |
| X5010 To Hs{Lord Ernest Hives - Chair} from RHC{R. H. Coverley - Production Engineer}, RHC{R. H. Coverley - Production Engineer}3/BE. 18.2.26. RE GOSHAWK BEVEL PINION THRUST BEARING We have carried out Thrust Tests on Hoffmann No.5153 Double Row Bearing which is being used on Production in place of the New Departure No.306. The construction of this Bearing is similar to New Departure but has altered and additional details such as Distance Piece between Outer Races and Improved Cages which should give more accurate assembly. The tests which have been carried out are representative of car conditions and similar to tests which New Departure No.306 Bearing was subjected. On examination after test condition of Races was found to be only fair there being distinct signs of scoring and did not compare favourably with the excellent condition of New Departure after similar tests. We observe that the Hoffmann Races are made in Journal Bearing Steel and New Departure Races are in a milder type of Chromium Steel containing .27% of Carbon which is suitable for carborizing. Judging by results it would appear that a case hardening material is more suitable for this type of Bearing. Particulars of Tests as follows:- Forward Tests Initial Float .003 Test No. | Load on Lever | Thrust Load | Revs of Rig | Time Run | Temp: of Oil | Increase in Float 1. | 166 2/3 lbs | 1,000 lbs | 2,000 r.p.m. | 20 hours | 46.C. | .0005 2. | 416 2/3 lbs | 2,500 lbs | 1,220 r.p.m. | 10 hours | 38.C. | .0005 3. | 716 2/3 lbs | 4,300 lbs | 700 r.p.m. | 10 hours | 41.C. | .001 Total Increase in Float .001 Reverse Test Initial Float .003 4. | 966 2/3 lbs | 5,800 lbs | 525 r.p.m. | 10 hours | 40.C. | .001 Total Increase in Float .001 Weights and comparitive particulars of Bearings given on attached prigts. RHC.{R. H. Coverley - Production Engineer} | ||