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).
Patent specification document detailing the claims and mechanisms for a change-speed gearing system.
| Identifier | ExFiles\Box 136\4\ scan0163 | |
| Date | 6th June 1933 | |
| 6 402,924 other arrangements for gear change may be used. The pivot pin 7c for the link bars may be supported at its opposite ends and also by an intermediate part 7k. 7h is a cottar pin for holding the pivot pin 7c in place. A four speed gear box is shown but any number of speeds may be controlled by my improved pre-selective mechanism. In the modification shown in Figure 12, the cam shaft 7 acts directly upon a peg 2b on the shift fork 2 and the lever 3 also engages said peg in order to operate the shift fork. In Figure 13, both the lever 5 and the lever 3 engage a common pin or peg 2b on the shift fork. The ends of the levers 5 and 3 may be slotted for the purpose. In the Figure 14 arrangement, the cam shaft 7 engages a peg 3d on the lever 3 instead of on a separate lever 5 as in Figure 1 or on the shift fork 2 as in Figure 12. The peg 3d may be in any suitable position upon the lever or even upon an extension thereof as indicated by dotted lines at 3e. In Figure 15, the link arm 34 has an end 34a which can ride upon the pin 7c in the cam shaft, the arm being swivel connected at 35 to the lever 3. When the camshaft 7 is turned in a clockwise direction, the part 34a finally drops behind the pin 7c and is drawn to the left by such pin when the cam shaft is turned anti-clockwise. It then operates the gear shift lever 3 substantially in the manner previously described. Figure 16 shows an alternative arrangement in which the cam shaft 7 is turned anti-clockwise to neutralise the shift fork 2 and clockwise to operate the lever 3. Upon anti-clockwise movement of 7, the end 3b of the link bar 8 falls on to the step 3f of the lever 3 and so operates the lever on the clockwise movement of the cam-shaft. Instead of providing the cam grooves in the cam shaft, I may provide pegs upon the latter to engage cams in the parts previously described which have the pegs 5b, 2b or 3d thereon. In any application of my invention the camshaft 7 may be connected to the control pedal of an engine friction clutch, or equivalent, so that the camshaft and clutch can be operated by the one control. Preferably the arrangement is such that the clutch is disengaged before the cam-shaft neutralises the gears and is re-engaged before the selected gear engages. Alternatively a separate control pedal or lever, or other suitable means, may be employed to operate the camshaft. My invention may be applied to synchromesh gears or to gears combined with a free wheel or other device to obtain smoother engagement of the gears. Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is :— (1). In change speed gearing, the combination with at least one gear shift fork or its equivalent and a lever for operating the same, of means for turning said lever about its pivot to operate the fork, a pre-selector device for determining which means shall move the lever, and a part which in one direction of movement puts the fork or forks in the neutral position and in the other direction moves the pre-selected means to turn the lever and through it slide a gear shift fork. (2). In change speed gearing, a control comprising a member adapted to be turned in one direction to put all gears in neutral and in the other direction to operate a gear shift fork through a pre-selected member, and a pre-selector permitting said member to become operative and holding all other similar members inoperative. (3). In change speed gearing as claimed in claim 1 or claim 2, the arrangement wherein the part which in one direction of movement neutralises the gears and in the other direction operates a pre-selected gear, also provides a locking means to hold the gear (which has been selected) in engagement or to hold all gears in neutral. (4). A control for change speed gearing comprising at least one gear shift fork slidable axially, a lever adapted to operate said fork to engage gears, a further lever adapted to operate said fork to release or neutralise the gears, a rotary element adapted in one direction of movement to operate link bars or arms to move said first named lever and in its other direction of movement to operate said further lever to neutralise the gears and a selector element allowing a link bar or arm to move into operative position. (5). In a control for change speed gearing as claimed in claim 4, the provision in the rotary element of a cam slot adapted to co-operate with a peg upon the further lever so as (1) to lock the engaged gear, (2) to move the further lever to neutralise the gears and (3) to lock the gears in the neutral position. (6). A control for change speed gearing comprising at least one gear shift fork slidable axially, a lever adapted to engage said fork to engage gears, a rotary element adapted in one direction of movement to operate link bars or arms to move said lever and in its other direction of movement to move said gear shift fork to neutralise the gears, and a selector element allowing a link bar or arm to move into its operative position. 402,924 7 (7). A control for change speed gearing as claimed in claim 4 or 6, in which the rotary member has the link bars or arms pivotally secured to a pin excentrically disposed in the rotary member. (8). A control for change speed gearing as claimed in claim 7 in which the selector allows the selected link bar or arm to fall on to a step on the shift-fork-operating-lever to move the latter by a pushing action. (9). A control for change speed gearing as claimed in claim 4, 6, 7, or 8, in which the lever which operates the shift fork to engage a gear, has wings upon its opposite sides to be engaged by the link bars or arms under the control of the gear selector. (10). A control for change speed gearing as claimed in claim 4 or 6, in which the link bars or arms are swivel connected to the lever which operates the shift fork and engage a pin on the rotary element under the control of the gear selector. (11). The improved change-speed gear control mechanism, substantially as illustrated in the accompanying drawings and as claimed in the preceding claims, in combination with change-speed gearing of the constant mesh type or sliding gear type or with change-speed gearing using any combination of constant mesh and sliding gears. Dated this 6th day of June, 1933. MARKS & CLERK. Redhill: Printed for His Majesty's Stationery Office, by Love & Malcomson, Ltd.—1933. | ||