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).
Mr. Royce's remarks on the 'Goshawk 11' axle tube brake and rear hub.
| Identifier | ExFiles\Box 5\3\ 03-page034 | |
| Date | 8th March 1921 | |
| To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ c. to Wor.{Arthur Wormald - General Works Manager} c. to Hs.{Lord Ernest Hives - Chair} c. to BY.{R.W. Bailey - Chief Engineer} c. to EFC. X4257 E2/08.3.21. X.4257 - RE "GOSHAWK 11" AXLE TUBE BRAKE, AND REAR HUB. Referring to ch.744 would you kindly note Mr. Royce's remarks as follows:- (1) The distance pieces between the hub ball bearings should be made lighter and cheaper. It can be either (a) Solid drawn taper tube. (b) Sheet metal welded into a tube. (c) A pot, drum parallel or taper with the bottom punched out, leaving an in-looking flange for the outer bearing. (2) The body of the nut which holds the brake drum gear on to the axle tube should be made thinner. (3) Mr. Royce thinks the wire wheel hub and the permanent hub both look too thick. He thinks they should both be reduced in thickness by .025". (4) There seems to be no adequate provision for preventing the wheel coming off should the ball bearings fail. The driving constellations in the inner hub should be formed with a smaller diameter behind the wheel driver, as previously used by R.R., so that the driving shaft will hold the wheel in an emergency. (5) The small ring which has been inserted in the hub for the purpose of magnifying the shoulder locating the inner ball bearing should be cancelled. Mr. Royce considers the difference in diameter between the outer races of the ball-bearings, namely, 5 m/m, will provide a sufficiently large shoulder. (6) The diameter of the mounting for the brake gear should be reduced by 1.5" that is to say, it is practically what it was on the 'Goshawk 1' axle. This is the most important alteration, which should have the effect of considerably reducing the weight and the cost of the brake gear mounting. The sheetmetal frame work carrying the shoes will also be reduced 1½" in diameter. In effect it means that when the brakes were increased in diameter it was only necessary to lengthen the arms Contd. | ||