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 detailing claims for a change-speed gearing system for motor vehicles.
| Identifier | ExFiles\Box 136\4\ scan0195 | |
| Date | 22th December 1934 | |
| 449,540 4 for facilitating the gear change might be employed. Instead of being operated by a common gear lever k the speeds could also be operated by different gear levers or by hydraulic, pneumatic, electric or other means. Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is :— 1. Change speed gearing, more particularly for motor vehicles, with means for facilitating the operation when changing speeds, characterised by the feature that the said means on movement of a control member in one speed-changing direction acts as a synchronising coupling (p₂) to bring rotary toothed members to like speeds prior to mutual engagement and on movement in another speed-changing direction, the said means acts as a synchronising brake (p₁) to bring other rotary toothed members to like speeds prior to their mutual engagement. 2. Change speed gearing with means for facilitating the operation when changing speeds as claimed in claim 1, characterised by the feature that the synchronising brake (p₁) is actuated only when changing over from the lower to the higher speed (II—III) and the synchronising coupling (p₂) preferably each time the lower speed (II) is put into operation. 3. Change speed gearing with means for facilitating the operation when changing speeds as claimed in claim 1 or 2, characterised by the feature that the synchronising brake (p₁) is actuated when changing over to a speed (III) which, according to whether it is being thrown in from a lower speed (II) or a higher speed (IV) is put into engagement by means of different coupling arrangements (h, g), and the synchronising brake (p₁) is connected with the coupling arrangement (h) which throws in the speed (III) from a lower speed (II, I, R), while, for changing over from the other or a higher speed (IV), another a change-over coupling is provided, which acts without the synchronising brake and is preferably in the form of a dog coupling (g) having dogs with bevelled end surfaces. 4. Change speed gearing with means for facilitating the operation when changing speeds as claimed in any of Claims 1 to 3, characterised by the feature that the means (p) for facilitating the gear-changing operation is non-rotatably connected to a gear member, for instance a toothed wheel (f₁) which is in constant connection with the engine coupling shaft (a), the gear member (f₂) for instance being braked by the synchronising brake (p₁) when changing up from a lower speed (II) to the higher speed (III) while, when changing down (III—II) it is synchronised with the Cardan shaft (b) by the coupling (p₂). 5. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that the change-over coupling (h) which coacts with the means (p) for facilitating the gear changing operation as claimed in any of Claims 1 to 4 alternatively couples to the Cardan shaft (b) on the one hand the gear member (f₁) which is non-rotatably connected with the means (p) for facilitating the gear changing operation and on the other hand a gear member (e₁) which is in constant connection with the gear member (f₁) through transmission gearing (f₁, e₂ : e₂, e₁). 6. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that for changing over from the highest speed, for instance a superspeed (IV) to the second highest speed, for instance the direct speed (III), and vice versa, a dog coupling (g) is provided which is provided with dogs or teeth having bevelled front surfaces and operates preferably without an intermediate position of rest, while for changing over from the second highest speed (III) to the next lower speed (II) and vice versa, a change-over coupling (h) is provided, for instance a normal dog coupling, which coacts with synchronising means as claimed in any of Claims 1 to 5. 7. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that the actuating member (k₂) actuates the means (p) for facilitating the gear changing operation as claimed in any of Claims 1 to 6 and the change-over coupling (h) coacting with the means (p) in such a manner that a greater operative pressure is produced on the means (p) for facilitating the gear changing operation than that produced on the coupling (h), an automatically disengageable coupling device (q₁, q₂, q₃) being provided which, after the actuation of the means (p) for facilitating the gear changing operation automatically disengages the arrangement (p) at a certain motion of the actuating member (k₂), so that during the further operative motion only the operative device for engaging the new speed, which is preferably moved directly by the actuating member (k₂), is actuated. 8. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that the lever (n) for actuating the means (p) for facilitating the gear-changing operation as claimed in any of Claims 1 to 7, is made fork-shaped, the T-shaped end (k'₂) of the selector bar (k₂) for actuating the lever (n) being disposed between the prongs (n₁, n₂) of the lever (n) and that in a bore of the T-shaped end of the selector bar two balls (q₁, q₂) or the like are disposed which engage in recesses (n'₁, n'₂) in the forked lever and are held apart by means of one or more springs (q₃). 9. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that the means (p) for facilitating the gear changing operation as claimed in any of Claims 1 to 8 is arranged in a separate compartment of the gear casing at the end of the latter, in such a manner that the half diameter of the synchronising coupling may be greater than the distance between the lay shaft and the main shaft. 10. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that the lever (n) for actuating the means (p) for facilitating the gear changing operation as claimed in any of Claims 1 to 9 engages by means of cheeks (o₁, o₂) in a sliding sleeve (p) in such a manner that the cheeks for actuating the synchronising brake (p₁) bear without friction and the cheeks for actuating the synchronising coupling (p₂) bear with friction, for instance with an interposed ball bearing (t). 11. Change speed gearing with means for facilitating the operation when changing speeds, having three pairs of toothed wheels in constant mesh and optionally further sliding wheels disposed between them, characterised by the feature that between two of these pairs, for instance the first two pairs (d₁, d'₁; e₁, e'₁) there is provided a change-over coupling (g) which acts without a separate synchronising device, is preferably provided with dogs having bevelled end surfaces and is preferably adapted to operate without an intermediate position of rest, and between the other two pairs (e₁, e'₁, f₁, f'₁) the change-over coupling (h) is provided which coacts with the means for facilitating the gear changing operation as claimed in any of Claims 1 to 10, comprising more particularly a synchronising coupling (p₂) and a synchronising brake (p₁), the said means being disposed externally of the pairs of wheels. 12. Change speed gearing with means for facilitating the operation when changing speeds, characterised by the feature that the change-over coupling (h) which coacts with the means for facilitating the gear changing operation as claimed in any of Claims 1 to 11 is constructed as a hollow member which is capable of sliding but not turning on the Cardan shaft, is provided at both ends with dogs and carries one or more toothed wheels which are capable of sliding but not of turning on it, for obtaining further speeds. 13. The improved change speed gearing comprising change facilitating means as claimed in any of the preceding claims, more particularly for motor vehicles, substantially as hereinbefore described with reference to the accompanying drawings. Dated this 22nd day of December, 1934. MARKS & CLERK. Leamington Spa: Printed for His Majesty's Stationery Office, by the Courier Press.—1936. | ||