US 608845 A
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Patented Aug. 9, I898. R. DIESEL.
INTERNAL COMBUSTION ENGINE.
(Application filed July 15, 1895.
2 Sheets-Sheet I.
4& r /A L WITNESSES:
mvamdm Hudol 5 Diesel,
No. 608,845. PatentedAug. 9, I898.
R. DIESEL. INTERNAL COMBUSTION ENGINE.
(Application flledJuly 15, 1895.)
2- Sheets-Sheet 2v (No Model.)
UNITED. STATES RUDOLF DIESEL, OF BERLIN,
GERMANY, ASSIGNOR, BY MESNE ASSIGN- YORK.
SPECIFICATION forming art of'iLetters Patent No. 608,845, dated August-9, 1898. Applicatio med July 15,1895. Serial No. 656,059. (No model.) Patented iirSp'sin December 3,1894, No. 16,654; in France December 10, 1894, No. 243,531; in Belgium December 10, 18 94,
No.'113,139; in Luxemburg December 10, 1894,No.
2,192; in Italy February 21, 1895,13XXV, 132 i in England February 27, 1395, F0. 4,243; in Switzerland March 6, 1895,
Nos. 10,134 and 10,135; in GermanyMarch 30, 1895, No. 86,633; in Hungary November 23, 1895, No. 4,639, and v Kai-ch 20, 1897,11'0. 7,876; in Austria'January 18,1896, No. 46/203, and May 22, 1896, No. 46/2,038, and in Denmark February 12, 1896,1l'o. 393- To all whom it may concern:
Be it known that I, RUDOLF DIESEL, a sub.- ject of the King of Bavaria, and a resident of Berlin, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Internal-Combustion Engines,
in England,No. 4,243,. dated February 27,
1895; in Switzerland, Nos.'10,134 and 10,135, dated March 5, 1895; in'Luxemburg, No. 2,192, dated December 10, 1894, and Patent of Addition No. 2,265, dated March 22, 1895; in Denmark, No. 393, 'dated February 12, 1896; in Austria, No. 4 203, dated January 18, 1896, and -No. 46;2,038, dated May22, 1896; in Hungary, No. 4,539, dated November 23, 1895, and No. 7,876, dated March 20, 1897; in Italy, LXXV, 132, dated February 21, 1895,and in Spain, No. 16,654, dated December 3, 1894, and Patent of Addition N 0. 17,085, dated March 4, 1895,) of which the following is a specification.
My invention has reference to improvements in apparatus for regulating the fuelsupply'in slow-combustion motors, and inparticular to internal-combustion engines adapted for carrying outthe process described in my prior patent, No. 542,846, dated July 16, 1895, which process consists in first compressing air or a mixture of air and neutral gas or vapor to a degree producing a temperature above the igniting-point of the fuel to be consumed, then gradually introducing the fuel for combustion into the compressed air while expanding against resistance sufliciently to prevent an essential increase of temperature and pressure, then discontinuing the supplyof fuel and further expanding without transfer of heat.
. In ordinary combustiomengines the regulation ofwork done was performed either the accompanying drawings, in which-- Figures 1 and 2 are diagrams illustrating the cycle of operation." Fig. 3 is a vertical section of anengine,illustrating one form of fuel-teed, part being broken away. Figs. 4 and 5 are similar views illustrating modified forms for the feed. Fig. dis a sectional elevation illustrating another modified form for the same. Fig; 7 shows sectional views of detail parts. Figs; 8, 9, and 10 illustrate in sectional elevation the arrangement of the mechanism for operating the valve. Figs. 11,
, 12, and 13 are sectional elevations illustrating diiferent devices for-mixin the air and fuel. Similar letters and fig u res f reference des ignate corresponding parts throughout the several views of the drawings.
Referring now to Fig. 1 of the drawings, which illustrates a theoretical indicator-diagram of the engine, the curve 2 3 corresponds to the period of admission and consumption of fuel, the fuel being injected under a pressure greater than the pressure 0 2 at the point of highest compression.
By varying the excess of pressure under which fuel is injected and in the meantime the length or duration of admission of fuel the combustion-curve 2 3, Fig. 1, is changed both in its form or position, as in its length 2 3, 2' 3 &c., thusproducing diagrams, such as-l 2 3 4 or 1 2 3 4', &c. In all the diagrams shown in Fig. 1 the fuel is admitted at the point 2 of highest compression. In Fig. 2 the beginning of admission is variable, as will be hereinafter explained.
Referring now to Fig. 3 for a description of an apparatus for carrying out the-regulation of the supply of fuel, the letter C designates a cylinder provided with a piston P and with an air-valve V. D is a nozzle for regulating thesupply of fuel, by meanspi'l l ichtheperiods of admission and cut-off, and consequently the length of the curve 2 3 or 2 3', &c., are determined with the use of a needlevalve n, actuated by anywell-known mechanism. 'Pulverulent solid fuel is contained, in a hopper T; provided with a rotary dis-' -tributing-valve r. L is a reservoir'which is supplied with suppressed gas through a pipe m. v.Thje gasmay be air, a combustible gas,
' or a: mixture of combustible gas and air.
i may in the usual manner regulate the supply.
The air or gas or the mixture of the same is held under a pressurefby means of a pump or other well-knownmeans) in excess-of the highest pressur in'the cylinder 0. Said rescrvoir L. is connected with the cylinder 0 by apipe S and with the hopper T bya suitable branch pipe in communication with the pipe' S.
When the valve n. is lifted to'o pen the noz zle D, the excess of pressure in the reservoir L causes the gas toflow through the pipes and the nozzle D into the cylinder C, carrying with it the pulverulent fuel discharged by the turning of the valve 'r. In this manner anlintimate mixture of gas'and fuel is obtained and injected into the cylinder and rapid and complete combustion is insured.
If the pressure in the reservoir L were fixed andeonstant, the same combustion-curve 2 3 would always result for a predetermined and fixed admission and cut-off and a predetermined or fixed highest compression in the cylinder 0; but if .under these conditions of admission and cut-off the curve of combustion is to be altered or varied then the pres:
sure :in the reservoir L must be changed. This change is elfected by means of the pressure-regulating valve R, Fig.3, the weight];
of which can be shifted by means of thefrbd valve for regulating the pressure in the res:
'ervoir L may of course be of any other construction which will answer the purpose and through the pipe m. The pressure regulation. can also be applied, as desired, to the pump feeding the tube m. This latter method would be adopted shouldfluid fuel be exclusively used, in which case the reservoir L would act as'the pressure vessel of the pump. The fuel-supply apparatus might be placed directly on the reservoir L, as the motion of the gas therein would keep the dust in sus- 1 3' 4', 3 4 &c. V effected by opening the f uel-valve a not when pension. The hopper T might also'contaiu fluid fuel.
The mixture of fuel and gas may take place inthe interior of-the cylinder or a prolongation thereof, as shown in Fig. 4. ;In this case the reservoir L contains pure compressed air, and in addition to thenozzle D for pulverulent fuel 'I provide a nozzle (Z for liquid or gaseous fuel for the purpose of intensifying combustion. In this instance the nozzle dis arranged concentric with the nozzle D, the liquid orgaseous fuel being supplied to said nozzle (1 through the lateral pipe S, while the air for combustion and the solid fuel are supplied to the nozzle D through the pipe S, leadingfrom the reservoir.
The nozzles D and d, inst-ead of being arranged concentrically, may be arranged side by side, as shown in Fig. 5, and caused to discharge into-a common combustion-chamber J, forming a prolongation of the cylinder and separated from the bore proper of the same bya perforated partition a. The regulation may be rendered still more sensitive by changing the fixed point 2 of the diagram, forinstance, to 2' or 2 Fig. 2, thus varying at the same time the height of the ordinate 0 2,.'0' 2, 0 2 &c., and the length 0 1, 0' 1,.
0 1, &c., as well-as the expansion-curve 3 4, This regulation is easily the piston is at the commencement of its return stroke, but somewhat later, in which case compression takesillace fr 1 to 2, Fig, 2, as-before; but the compress gas first expands on the return stroke from 2 to 2 or 2 2 &c.,'before the commencement of the period of combustion 2' 3', 2 3 &c.
- Of course in practice the lines of the'diagram are not so regular as shown, but about as indicated in dotted lines between 2"and 3', Fig. 2. It is also evident that the lead may be given to the fuel-valve n on the compression stroke, whereby the upper end of the compression-line 2' -2 is made steeper and the combustion-curve changed to 2 3 taking,
under circumstances, even a form like 2 m 3 This lead. of the valve may .be effected 'by changing the position of the cam actuating said valve, so that the fuel will be introduced somewhat in advance of the end of the compression stroke of the piston and the valve kept open during part of the working stroke of the piston.
It is of particular importance that the fuel entering at the mouth'should be thoroughly consumed and without the formation of soot.
For this purpose all of the above-described devices for the admission of fuel may be pro vided within the cylinder with an additional 'burner similar in construction to those used for'the same purpose for gas-burnersthat is to say, the jet is not permitted to enter in solid cylindrical form, but is subdivided into thin sheets or jets. The construction may besimilar to the Bunsen burner, which, as well known, gives a smokeless non-luminous show other forms of the same.
frame. Such burners,located within the compression-space, are shown in Figs. 6, 7, 11, 12, and 13.
Fig. 6 shows a burner which subdivides the flame into a large number of very small tongue-shaped slow-burning jets. M and M The principle of the Bunsen burner is embodied in M and M the jet leaving the lower end whileburning slowly and without discoloration. A similar efiect is produced by the use of the twyer M .The uniformity of dilfusion of the heat throughout the whole mass of air in the compression-space is further increased by the peculiararrangement of the'burnersas, for instance, in Fig. 11, where owing to the lengthening of the twyer-pipe the burneris attached at E, so that while the piston is receding from I to II the greater part of the air is com pclled to pass across the burner E. A second burner 0 may be provided.
Fig. 12 shows an arrangeiiifent for introducing the fuel laterally. Thegi'ibs R R on the left force the air on its wayffrom the chamber to the cylinder and while expanding over the burners. The ribs R R to the right may be attached to the piston, so that the motion of the latter causes considerable agitation of the air. Finally, as shown in Fig. 13, the burner itself may be made movable for the purpose of obtaining more perfect distribution of heat. In this case the burner may be attached to the piston and the fuel supplied through a hollow piston-rod.
Figs. 6, S, 9, and 10 show another way of carrying out the above-described method of regulation, the use of a special air-pump being dispensed with. In this instance the piston itself compresses the air necessary, not, however, in the usual wayby the momentum of the fly-wheel after cessation of com bustionbut during the normal process of working without interrupting combustion and as an integral part of the working process itself.
In Figs. 6 .and 8 the letter Y designates a valve through which during the regular workin g a small quantity of compressed air escapes at the end of each compressing stroke of the piston and passes by the tube b, Fig. 6, into the reservoir L. The air-pressure in the reservoir, therefore, equals the highest compression-pressure in the cylinder; butaccording to the previous description of the process an excess of pressure is required for the injection of the fuel. To obtain this result, the fuel-nozzle is not opened untilthe piston has slightly receded from the dead-point-that is to say, until the pressure in the cylinder has become somewhat lessened. As the opening of the nozzle by the governor occurs sooner or later, so the excess of pressure in the reservoir L varies. The injection ofthe fuel takes place, as previously described, S, Fig. 6, being the connecting-tube between the reservoir L and the nozzle, as in Fig. 3. The valve the motor.
Y can also be arranged to be opened at the end of the stroke by the piston itself, or it might be a self-acting relief-valve, or for it might be substituted a cock or slide-valve.
Figs. 9 and 10 show the details of the gear for positively operating the valve Y. Wis a cam-shaft provided with a number of camsI to V- Cam II works valve Y in normal working. Cam III works the f uel-valve for nozzle D, and cam IV operates the main valve V of This gear serves also in reverse order to start the motor, compressed air passing through valve Y from the reservoir L into.
the cylinder to drive the piston and then escapes through the valve V. During this very short starting period the lever H, Fig. 9, takes the dotted position 11, so that the valve Y is moved by cam I instead of cam II, the valve V by cam IV instead of cam V, while the f uelcam III is disengaged. After a few revolutions made in this manner the motor obtains its normal speed. At this moment the detent p, which retains the lever H in position, is removed. The leveris automatically pushed by spring F to the normal working position II,
carrying with it the system of cams to contiuue the normal working without interruption. As the moving of the cams has to occur at the exact moment, it can only take place when a specially-arranged notch in the hub of the cams receives the detent 1).
The valve Y (shown in Fig. 7) serves three purposes: first, to start the motor with compressed air; secondly, to fill the. reservoir L during normal working, and, thirdly, to operate as a safety-valve, it being loaded by a spring Z, so that on explosion in the cylinder the gases can pass to the reservoir L and thence through the safety-valve R.
To determine the maximum pressure in the cylinder, and consequently that in the reservoir L, a hand-wheel I1 is applied, byineans of which the spring Zcan be compressed more or less either while the engine is stopped or in motion.
It is evident that by adjusting the position of the cam III on the shaft \V the time of opening of the fuel-supply valve can be variedthat is to say, by turning the cam either to the right or the left on the cam-shaft the time of admission will be made earlier or later. It is also evident that by interchanging cams a different timing of admission can be obtained.
That I claim as new is- I 1. In an internal-combustion engine, the combination of a cylinder and piston constructed and arranged to compress air to a degree producing a temperature above the igniting-point of the fuel, a supply for compressed air or gas; a fuel-supply; adistributin g-valve for fuel, a passage from the airsupply to the cylinder in communication with the fuel-distributing valve, an inletto the cylinder in communication with the air-supply and with the f uel-valve, and a cut-oil, substantially as described.
2. In an internal-combustion engine, the combination of a cylinder and piston constructed and arranged to compress air to a degree producing a temperature above the igniting-point of the fuel; a distributing-valve for fuel; a cutoff for Varying the time and duration of the supply of fuel, and a burner placed in the combustion space and constructed for slow and perfect combustion'of the gradually-introduced stream of fuel, substantially as shown and described.
3. In an internal-combustion engine, the
combination of a cylinder and piston constructed and arranged to compress air to a degree producing a temperature above the igniting-point of the fuel, a supply for compressed air or gas, a hopper, a distributingvalve for pulverulent fuel, a passage from the air-supply to the cylinder in communication with the fuel-distributing valve, an inlet-valve to the cylinder in communication with the air-supply and with the valve for pulverulent fuel, and a cut-olf for the fuelsupply, substantially as shown and described.
4. In an internal slow-combustion engine, the combination of a cylinder and piston constructed and arranged to compress air to a degree producing a temperature above .the igniting-point of the fuel, a supply for compressed air, a hopper and distributing-valve for pulverulent fuel, asupply-pipe for liquid- .fuel, a valve or valves leading to the cylinder and communicating with the pulverulentfuel-distributing valve and the liquid-fuelsupply pipe, and a cut-off for the f uel-supply, substantially as specified.
5. In an internal-combustion engine, th combination of a supply for compressed air, a feed for pulverulent fuel placed in communication with the air-supply and with the cylinder, and an auxiliary feed for liquid fuel communicating with the cylinder, substantially as specified.
6. In an internal-combustion engine, the combination of a cylinder and piston, a supply for compressed air, a distributing-valve communicating with the air-supply and with a fuel-supply for gradually introd ucing a um itary, or mixed fuel, into the combustionspace, a valve placed between the air-supply and the cylinder, and a reversinggear in cooperation with said valve for starting the mot-orwith the compressed air from the air-supduring part of the working stroke, substantially as and for the purpose specified.
8. In an internal-combustion engine, the combination of a cylinder and piston constructed to compress air or a mixture of air and neutral gasga storage-reservoir in communication withjtlie combustion-space of the cylinder, a valve 'fcontrollin g this comm unication and opening-to admit compressed air from the cylinder to the reservoir, and a fuelfeed in communication with said reservoir for the introduction of fuel to the combustionspace under the pressure of the compressed air or gas in the reservoir, substantially as dc scribed.
9. In an internal-combustion engine, the combination of a cylinder and piston con structed and arranged to compress air to a degree producing a temperature above the igniting-point of the fuel, a distributing-valve for fuel, and a cut-off for varying the time and duration of the supply of fuel by said valve, substantially as described.
In testimony that I claim the foregoing as my invention I have signed my name in presence of two witnesses.
RUDOLF DIESEL. lVitnesses:
WM. I-IAUPT, OHR. Kaiicnn.