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).
Experiment on a plain bearing reverse shaft for a 4-speed gearbox, comparing whitemetal and bronze bearings.
Identifier | ExFiles\Box 6\4\ 04-page058 | |
Date | 1st February 1935 | |
X5810 TO R.R. FROM AJS. SECRET. AJS/1402.2.35. COPY to GM. COPY to YNS. INDIA. 4 SPEED BOX. PLAIN BEARING REVERSE SHAFT EXPERIMENT. The print of Lec. 1998. attached hereto shews a scheme of above which we think can be made quickly as not calling for any modification to casing except drilling two oil ducts. The casing imposes certain limitations to an efficient lubrication scheme and we are pointing out to the Sorps the possible necessity of fitting some form of internal oil feeder to the drilled ducts. The bearings have been whitemetalled for the following reason:- (Particularly) (1) It was considered that a deflecting shaft would be more likely to bed on a whitemetalled bearing. (2) According to Goodman a whitemetal bearing will take 25% more load than a bronze one under the same conditions. (3) Less friction with white metal. Comparing the rear and most heavily loaded bearing with the G.2. Reverse pinion bearing which stood up to full torque for half an hour with a car speed of a little less than 10.MPH. at 10.P.M. and full torque G.S. bearing pressure is 420 lbs. per sq. in. and surface speed 300 ft per minute approximately. whereas India is 650 lbs. per sq. in. and 510 ft per minute surface speed approximately. Multiplying the pressure and surface speed in each case we get 126,000 for Goshawk bronze and steel and 330,000 for India whitemetal and steel, which is about 2½ times Goshawk. AJS. | ||