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).
Diagrams showing the general arrangement of the rear axle, brake, and front wheel suspension.
| Identifier | ExFiles\Box 126\3\ scan0145 | |
| Date | 20th March 1936 guessed | |
| 4 General arrangement of rear axle and brake. pinion. In this way synchronisation of speeds is obtained prior to dog-clutch engagement. The scheme is repeated on the rear end of the sliding sleeve, where dog-clutch engagement may be made with the rearmost gear, which is also in constant mesh with the layshaft gear. In this way direct drive and the third-speed ratio are obtained. First and second speeds are not provided with synchro-mesh engagement. In the centre of the sliding sleeve are two gears made separately, but spigoted and riveted together. These slide into engagement with either of two gears on the layshaft. These four gears, of course, are spur gears, whilst the four constant-mesh gears are spirals. The outer elements of the cone clutches are of steel, whilst the inner members are of phosphor bronze. The sliding member of each clutch is provided with spring retained balls, which forms a means of locating it in the splines on the shaft on which each is mounted. For the reverse, a double width pinion is slidably mounted on a pin fitted in the left-hand side of the gear-box casing. To actuate it a depending finger is arranged on one side of the box, pivoted to a side wall, the upper part being bent over so that it may be picked up by the change-gear lever. The layshaft is solid and formed integrally with the first-speed pinion, the other three gears being each attached by a Woodruff key. Both shafts run on ball journal bearings, while the spigot bearing for the third motion shaft is of the needle roller type, a lubricating hole being drilled between two teeth in the constant - mesh pinion into the spigot. A spring-controlled taper-ended pin spigots in the horseshoe-shaped member, locking it in the central position when neither dog clutch is engaged. The box itself is of aluminium formed in one with the bell housing for the clutch, while the top cover carries the spherical bearing of the centrally mounted change-gear lever. With a 4:3 rear axle ratio the overall gear ratios through the box are 4.3 : 1 top, 6.6 : 1 third, 9.8 : 1 second, and 16 : 1 first gear, while the reverse is 16.1 : 1. Rear axle. An open tubular propeller-shaft transmits the power to the rear axle. At each end is a universal joint of the double-fork type, fitted with needle roller bearings. At one end a fork forming one half of the joint is welded on to the propeller-shaft, while General arrangement of front wheel suspension. 4901 | ||