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 use of single helical gears and the testing of ball bearings to handle end thrust.
| Identifier | ExFiles\Box 75\1\ scan0068 | |
| Date | 21th May 1914 | |
| 225a (150 H) (W.W. 315. 21-5-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0570. Wor{Arthur Wormald - General Works Manager}/Hyll/L19614. Sheet 2. present type box and should be no heavier than the ordinary spur gears. We have already proved that the single helical 12's pitch gear can be easily produced to run quietly, the silence does not seemto be effected by a change in the thickness of the oil in the gear box, the only questionable point is that of end thrust. An end thrust bearing cannot be conveniently fitted to the present box. We have run a set of these gears some thousand miles without any special provision for end thrust and have so far experienced no trouble. I think it quite likely we shall be able to use single helical gears without a special end thrust bearing, particularly if the deep grooved D.W.F. ball bearing proves to be better for end thrust than the ordinary type of ball bearing. We have some of these bearings on order but have not received them yet. I am making tests with various types of ball bearings as regards their ability to withstand end pressure and as soon as the D.W.F. bearings arrive they will be tested and compared with the standard type of bearing. | ||