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 describing the features and mechanics of the Goshawk III 4-speed gearbox with servo.
| Identifier | ExFiles\Box 6\4\ 04-page010 | |
| Date | 6th July 1924 | |
| To BY.{R.W. Bailey - Chief Engineer} From A.J.Stent. c. to R.{Sir Henry Royce} CJ. HS.{Lord Ernest Hives - Chair} K.4550 S310 STM/6.7.24. GOSHAWK III. 4-SPEED BOX WITH SERVO. K.4550 Y5510 We send herewith drawing of the above - LsC.1697 showing the internal mechanism. This includes the gearbox shafts, wheels and servo drive, change speed mechanism, and interlock. A small gate will be fitted to the change speed lever shaft casing which will locate this lever sideways. Stops for end location of the wheels are provided in the box itself. The particular features of this box are :- (1) 4 speeds. (2) Servo drive incorporated. (3) Ball and roller bearing reverse shaft. (4) Simplified slider lock of ball plunger type. (5) Simple and robust form of centreing mechanism for the change speed lever. (6) Direct operation of reverse without additional length to box or complicated eccentric reverse mechanism. The forward part of this box is very similar to the 3-speed box with side lever and without servo, sent you some time ago. A window is provided in the R.H. side of the box for assembling the 3rd. and 4th. speed slider also for locking the nut on the slider. A window is also provided on the other side of the box for locking the nut retaining the reverse wheel on its sleeve by means of the plate washer. It should be noted that this reverse wheel is located between a split ring of the piston type sprung into a groove on the sleeve at one end, and a nut clamping it against this ring at the other. We intend that the lower lever on the vertical inter lock shaft shall be pressed on tightly, and pinned. The upper lever is serrated similarly to E.7415 that is, with one blank serration to locate its position, and is easily removable after detaching a small cover. We would call your attention to the slight counter-boring which has been asked for on the long slider. The plain portion at the rear end of the 3rd. motion shaft is to be accurately ground, to enable the ground bore of large wheel and worm assembly to bed as uniformly here as on the ground or machined diameter at bottom of splines. contd:- | ||