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).
Technical memorandum regarding the design of gearboxes for Bensport and Peregrine models.
| Identifier | ExFiles\Box 178\3\ img267 | |
| Date | 8th July 1932 | |
| ORIGINAL. H.{Arthur M. Hanbury - Head Complaints} FROM EDY. C. to Sc. Wor.{Arthur Wormald - General Works Manager} HS.{Lord Ernest Hives - Chair} C. to I. FR. IMC. GEARBOX. BENSPORT & PEREGRINE. RDY1/NB.8.7.32. Y4583. Y4057. We send herewith N. sch. 3490. which shows most of the Bensport gearbox. The remaining information will be sent in a few days. The shaft centres have been increased from 2.8" on existing Peregrine to 3". As Bensport and Peregrine are to have identical gearboxes excepting control, this information applies also to Peregrine. We shall be sending the necessary modifications to the Peregrine side change mechanism to suit this box very shortly. The gear ratios are: 3rd .75, 2nd .49, 1st .31, R .31. Peregrine will not need to have so large a flange as Bensport, but we are assuming for the moment that for reasons of manufacture the flanges will be identical. We would call attention to the following points on N. scheme 3490:- (1) All of the ball and roller bearings are standard except that on the 1st. motion shaft. As shewn it measures 35 X 77 X 19, which gives the same section as for the size smaller 35 X 72 X 19 medium, and consequently not less load than for the latter - i.e. 760 lbs. at 2000. The nearest standard size is 1 3/8" X 3" X 11/16" light (34.9 X 76.3 X 17.5) which is only rated at 530 lbs. at 2000. This is too low. The 80 mm. dia. of the standard 35 bore bearing leaves insufficient metal between the bearings. We do not mind what section is used approximating to what we show so long as the makers will give a rating not less than 760 lbs. at 2000., for example 1 3/8" X 3" X 3/4" might be preferred. (2) The inner race of the roller bearing on the 3rd. motion shaft is located with slight clearance by the sleeve which is a press fit of sufficient tightness to prevent rotation. There is no pin in the sleeve and the nut is of such hand that it tightens should the sleeve rotate. (1) | ||