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 a supercharger system with an adjustable mounting and flexible ducting for an internal combustion engine.
| Identifier | ExFiles\Box 140\1\ scan0203 | |
| Date | 13th April 1937 | |
| 2 478,982 water pump 23 and generator 24. The generator 24 is attached to that side of the supercharger driving gear housing opposite to the supercharger's attachment to the 5 accessory shaft 22 so that the generator is in reality driven by the drive shaft of the supercharger which in turn is actuated by the accessory shaft. The supercharger, per se, comprises a 10 generally vertically disposed housing, the middle portion 25 of which will be here- after designated as the impeller shaft housing; the lower portion 26, which will be hereafter referred to as the driving 15 gear housing, and the upper part 27, which will be hereafter adverted to as the lower half of the impeller housing. A complementary cover plate or housing 28 is secured to the housing 27 by bolts and 20 cap screws 29 so as to form a suitable enclosure for the impeller of the super- charger. A boss 36 on the crankcase is recessed to receive one leg of an angle bracket 37 25 so that the top surface thereof is substan- tially flush with or slightly below the surface of the boss 36, said bracket being attached to the boss 36 by countersunk flat head screws 38. The other leg of the bracket 30 37 is drilled and tapped to receive set screws 39 which are threaded therethrough in position to have their inner protruding ends abut against the driving gear housing 26 for adjustably positioning the super- 35 charger with respect to the accessory shaft and other connections to which the supercharger is attached. Lock nuts 40 are provided on the set screws 39 for securing said screws in adjusted position 40 so that the supercharger may be replaced in such adjusted position in the event of removal for service or the like. The slightly enlarged holes through the lugs 32 on the base of the gear housing permit 45 limited adjustment by the set screws 39 before the cap screws 33 are fully set up. The top or cover plate 28 of the impeller housing is provided with a water jacket opening 123 of varying cross sectional area 50 and the point where the water jacket has the greatest cross sectional area is located adjacent to the place where the impeller pressure is the highest. Water from the internal combustion engine cooling system 55 pump 23 is supplied to the water jacket 123 by feed pipe 124. A down draft carburetor 125, as shown in Fig. 1, is mounted on top of the impeller housing so as to discharge its fuel down- 60 wardly through the central opening 126 provided in the impeller housing cover 28 so that the fuel is drawn downwardly on to the top surface of the impeller 118 from which it is thrown outwardly by the 65 impeller blades 119 into the collecting ring 127 which is formed beyond the outer peripheral edge of the impeller partly in the lower housing 27 and partly in the upper housing or cover plate 28. Water passes out of the jacket 123 70 through a pipe and hose connection 131, as shown in Fig. 3, and into a water jacket 132 formed in the fuel duct 133 which carries the fuel mixture from the supercharger to the engine intake manifold 134. 75 It has been found extremely difficult to secure a satisfactory connection be- tween the supercharger and the intake manifold by means of rigid connections. For one thing the variations due to quan- 80 tity production manufacturing methods makes it extremely difficult to have rigid connections in exact alignment and then due to vibration, such rigid connections after very short service, the ends of 85 the duct embraced by the rigid connections becoming crystallized and cracked regard- less of the metal from which they were formed. This problem was solved by providing a 90 flexible floating connection, as shown in Fig. 7. The end of the duct 133 adjacent the supercharger telescopes within the socket 135 in spaced relation thereto, and is surrounded by a rubber ring 136 which 95 is compressed in a V-shaped groove formed half in the supercharger housing and half in a ring 137 which is secured to the housing by bolts 138. The opposite end of the duct 133 like- 100 wise has a telescoping fit in spaced relation in a socket in an upstanding collar 139 (Fig. 4, formed on the manifold 134 and a rubber gasket ring 140 is compressed against the telescoped end of the duct by a 105 clamping ring 141 secured by cap screws 142. In the particular internal combustion engine shown, the timing shaft 143 extends upwardly through the middle of the fuel 110 duct 133, which duct is bifurcated to form equal passageways on each side of the streamlined island 144 formed in the middle thereof as shown clearly in Fig. 3. Water passing into the jacket 132 of the 115 fuel duct 133 passes downwardly through an opening 145 into the cylinder head water jacket 146 from which it passes to the radiator in the usual manner. The internal combustion engine is pro- 120 vided with a removable cylinder head 147 and the supercharger is so positioned with respect thereto that said cylinder head may be removed upwardly when the cross- over fuel duct 133 is removed without 125 disturbing the mounting of the super- charger except for dis-connection of an angle bracket 148 which ties the impeller housing of the supercharger to the side of the cylinder block for reducing vibration. 130 478,982 3 In the operation of this device, rotation of the engine crankshaft 149 through the medium of chain belt 150 rotates the cam shaft 151 and accessory shaft gear wheel 5 152 which is rigidly secured to the acces- sory shaft 22. Rotation of the shaft 22 causes the drive gear 48 to rotate the worm 64, thus rotating the impeller 118 which is mounted on a vertically disposed impeller 10 shaft 65. Rotation of the impeller draws fuel downwardly through the car- buretor 125, and supercharges it outwardly from the collecting duct 127 into the 15 cross-over duct 133, thence to the intake manifold 134 of the internal combustion motor. Water from the cooling system of the motor passes through the pipe 124 into 20 the water jacket 123 formed in the impeller cover plate 28 and thence through the hose connection 131 into the water jacket 132 of the cross-over duct 133 from which it discharges into the water jacket 146 25 of the cylinder head. The arrangement of the supercharger and cross-over duct 133 is such that the floor of the fuel mixture conducting passageway from the supercharger to 30 the intake manifold is on a continual decline so that liquid fuel which may con- dense on the walls of the cross-over duct can not form in puddles, but drains at all times and at all places from the floor of 35 the supercharger to the intake manifold 134. Attention is directed to Specification of co-pending Application No. 20337/36, (Serial No. 478,957), in which certain 40 parts of the mechanism herein described are also described and illustrated. Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be per- 45 formed, we declare that what we claim is :— 1. An internal combustion engine hav- ing an intake manifold located on one side thereof and a supercharger structure on 50 the other side thereof, the supercharger and the manifold being connected by a duct which extends over the cylinder head, characterised in that the supercharger structure is adjustably mounted. 55 2. An internal combustion engine com- prising an intake manifold along one side thereof, a supercharger adjustably mounted at the opposite side of the engine, a removably mounted duct extending over 60 the cylinder head of the engine connecting and providing communication between the supercharger and intake manifold, a detachable cylinder head on the internal combustion engine, the supercharger and 65 manifold being located and arranged so that the cylinder head may be removed from the engine without removing the supercharger or intake manifold. 3. A supercharger construction for an internal combustion engine according to 70 claim 1, in which the supercharger impeller housing is higher than the manifold and provided with a down-draft carburetor above it to supply combustible mixture thereto. 75 4. An internal combustion engine according to claim 1 or 2, having a sub- stantially horizontally disposed accessory shaft, the supercharger being driven by said shaft, said supercharger having a 80 substantially vertically disposed impeller shaft, driving gears between the lower end of the impeller shaft and the accessory shaft, and an impeller secured to the upper end of the impeller shaft. 85 5. An internal combustion engine according to claim 1 or 2, in which the supercharger discharges into said intake manifold through a fuel mixture passage- way, the floor of which is on a substantially 90 continual decline from the supercharger to the intake manifold. 6. An internal combustion engine according to claim 1 or 2, having a water- cooling system and in which the super- 95 charger has an impeller surrounded by a housing having a water jacket which is supplied with water from the engine- cooling system. 7. An internal combustion engine, 100 according to claim 1, in which one of the duct connections is flexible. 8. An internal combustion engine, according to claim 1, in which one end of the duct has a floating non-metallic sealed 105 connection. 9. An internal combustion engine, according to claim 1, in which one end of the duct has a telescoping fit with its adjacent member, and a flexible sealing ring is 110 interposed between said duct end and its adjoining member for sealing the connec- tion while permitting relative movement of the telescoped parts. 10. An internal combustion engine in- 115 cluding a supercharger therefor constructed arranged and adapted to operate substan- tially as hereinbefore described with re- ference to the accompanying drawings and for the purpose specified. 120 Dated this 13th day of April, 1937. For: GRAHAM-PAIGE MOTORS CORPORATION, Stevens, Langner, Parry & Rollinson, Chartered Patent Agents, 5—9, Quality Court, Chancery Lane, London, W.C.2, and at 120, East 41st Street, New York, U.S.A. Leamington Spa: Printed for His Majesty's Stationery Office, by the Courier Press.—1938. | ||