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).
Letter to a bearing company discussing test results for rear axle pinion bearings.
| Identifier | ExFiles\Box 114\2\ scan0035 | |
| Date | 11th April 1934 | |
| X3807 Exptl. Dept. HS{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}2/KW. 11th April, 1934. Messrs. Ransome & Marles Bearing Co.Ltd., Newark-on-Trent. Attention Mr. Hickling. Dear Sirs, Rear Axle Pinion Bearings. ------------------------- We thank you for your letter of the 6th inst., giving a resume of the rig tests you have carried out on our Bentley Pinion Thrust Race. As regards our road test on a 3MDJT/30 Bearing: at the end of 10,000 miles the bronze cage in the thrust half was found to be broken, but the races in excellent condition. A hard carbon deposit had formed between the cages and the inner races. The same bearing was then fitted with steel cages and ran a further 10,000 miles. The surface of the inner thrust race showed one small local failure, due presumably to the presence of foreign matter. Wear of the shoulders on the inner race was more pronounced than with bronze cages. For both tests Wakefield's E.P. oil was used. In view of our deciding to standardise a 4-MD bearing with dural cages, we should be glad to hear that one of these had completed 500 hours on your test rig. 2-MD JT/35 Bearing. The top gear loads on this bearing in our experimental 40/50 axle are 1910 lbs. thrust and 2500 lbs. journal loads. 1st gear ratio is 2.6. Perhaps you would let us know how the overload on this bearing compares with the Bentley axle. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||