Double fuel feeding device

[Detailed Description of the Invention]

[Industrial Application] The present invention relates to the fuel injection device of many cylinder internal combustion engines, more particularly, carries out the main fuel To of the alcohol etc. which cannot carry out compressed self ignition easily, and relates to the double fuel supply system of the diesel engine using light oil excellent in compressed self ignition etc. as subfuel. [Description of the Prior Art] Alcohol etc. are used as the main fuel, and in the double fuel supply system which uses light oil etc. as subfuel, it is known that it is preferred to make these inject in layers, without mixing alcohol and light oil. That is, a little light oil is made to inject previously in order to offer charcoal, and subsequently the main fuel barrel alcohol is made to inject. Such a double fuel supply system is indicated by JP,58-206867,A. [Problem(s) to be Solved by the Invention] It consists of the feeding machine and fuel injection nozzle for feeding the distributed type fuel injection pump and the subfuel for feeding the main fuel, and makes it the feeding machine operate in the above-mentioned prior art with the pressure of the main fuel under feeding of a distributed type fuel injection pump. In order [ which mentioned the Lord and subfuel above ] to supply in layers, the feeding machine which operates with the pressure of the main fuel in the middle of being introduced into the main fuel introduction passage of another injection nozzle is made to perform introduction of the subfuel to the subfuel introduction passage of a specific injection nozzle. Therefore, subfuel is introduced into a specific fuel injection nozzle in advance of the injection timing of the nozzle, and the main fuel is injected by the nozzle when turn comes. Introduction of subfuel is performed by the pressure which does not result in the injection-valve opening pressure of a nozzle. In the prior art mentioned above, since the feeding machine of the number of cylinders and the same number was required, there was a problem which the variation in the fill volume between the cylinders based on the individual variation of a plurality of feeding machines says in When you live. [Means for Solving the Problem] A fuel injection pump which has a plurality of discharge passages by the present invention in order to feed the 1st fuel in order to solve the above-mentioned problem, A feeding machine which has a single sending-out mouth and was mechanically connected with the fuel injection pump in order to feed the 2nd fuel, In order to introduce the 1st and 2nd fuel, it becomes each from a plurality of fuel injection nozzles which have the 1st and 2nd fuel introduction passages, While each 1st fuel introduction passage of a fuel injection nozzle is connected with a discharge passage of a fuel injection pump at each, All the 2nd fuel introduction passage of a fuel injection nozzle is connected with the single sending-out mouth of a feeding machine in common, and a double fuel supply system with which a check valve which prevents further a flow which faces to a feeding machine in the 2nd fuel introduction passage of a fuel injection nozzle is arranged is provided. Feeding of the 2nd fuel is performed by pressure smaller than injection-valve opening pressure of a fuel injection nozzle, and it fills up with the 2nd fuel near the bottom of a fuel injection nozzle. If it sees about a specific injection nozzle, it will fill up with the 2nd fuel two or more times between injections of the 1st fuel, for this reason fill volume of the 2nd fuel will be equalized. [Example] In Drawing 1, the double fuel supply system by the present invention comprises one fuel injection pump 10, one feeding machine 12, and fuel injection nozzle 14 of the number of cylinders of a diesel engine, and the same number. There is the 2nd fuel tank 18 for subfuel, such as the 1st fuel tank 16 for the main fuel, such as alcohol, and light oil. The 1st fuel is supplied to fuel injection pump 10 with feed pump 20, and the 2nd fuel is supplied to feeding machine 12 with feed pump 22. Fuel injection pump 10 can be conventionally constituted as a fuel injection pump of a publicly known distributed type or a format, These feed fuel by the operation of the plunger (not shown) inserted into the cylinder, and since such a plunger is driven, there is driving shaft 24 which rotates synchronizing with an organization. Fuel injection pump 10 has high-pressure fuel discharge mouth passage 26 of the number of cylinders, and the same number, in order to supply the fuel pressurized by the operation of the plunger to each fuel injection nozzle 14, and it is 2 ing. Constant-pressure type delivery valve 28 is arranged at each discharge passage 26. Each constant-pressure type delivery valve 28 is closed at the time of the end of injection while it opens the passage which goes to fuel injection nozzle 14 at the time of injection, and it keeps constant the residual pressure of fuel injection nozzle 14 after the end of injection by check valve 30 further provided in the inside. Each fuel injection nozzle 14 consists of nozzle body 34 which has nozzle 32 at the bottom, and needle valve 35 inserted into nozzle body 34. Although the upper part portion of fuel injection nozzle 14 is omitted in Drawing 1, probably, it will be clear that the spring which energizes needle valve 35 into such an upper part portion is arranged. 1st fuel introduction passage 36 for introducing the 1st fuel into nozzle body 34 is formed, and this 1st fuel introduction passage 36 can be opened for free passage to nozzle 32, when needle valve 35 is opened. This 1st fuel introduction passage 36 is connected with specific discharge passage 26 of a fuel injection pump with pipe 38, respectively. 2nd useless fuel introduction passage 40 that introduces the 2nd fuel further is formed in nozzle body 34, and this 2nd fuel introduction passage 40 is open for free passage to 1st fuel introduction passage 36 near the valve seat of needle valve 35. More particularly, 2nd fuel introduction passage 40 is formed through the central part of needle valve 35 from nozzle body 34, and the opening is radiately carried out to the annular portion of 1st fuel introduction passage 36 near the tip part of needle valve 35. Each fuel injection nozzle 14 has the same structure, and all the 2nd fuel introduction passage 40 is connected with single sending-out mouth 48 of feeding machine 12 in common. zeta, To et al., This, and each 2nd fuel introduction passage 40 -- feeding machine 1.24 -- consist of 5 by which check valve 42 which stops the going flow is arranged, and l Transmitter 12 t-:l:main part 44, and an Amsonia elliptica-like inner cavity is mostly formed in 11 main parts 44 The inner cavity portion corresponding to the level neighborhood of T forms a straight line-like passage, and the end serves as feed port 46 for the 2nd fuel, and sending-out mouth 48, respectively. Check valve 50 which permits only an inflow into feeding machine 12 of fuel is arranged in feed port 46, and the 2nd fuel is introduced via feed pump 22 from the 2nd fuel tank 18. Pipe 54 in which passage resistance was made equal when check valve 52 which permits only the outflow from feeding machine 12 of fuel to sending-out mouth 48 was arranged and sending-out mouth four days of this flower - made length and an inside diameter equal, and 56. 58 connects with all the 2nd fuel introduction passage 40 of fuel injection nozzle 14 in common. Spring room 60 is formed between feed port 46 of feeding machine 12, and four days of sending-out mouths. The end of feeding piston 64 slidably inserted in cylinder 62 corresponding [ perpendicular neighborhood of the above-mentioned T form inner cavity ] projects in spring room 60, and is 2 ing. Spring 66 is arranged in Sprout l From time to time * room 60, and feeding screw I and A 64 are energized below in Drawing 1. Tappet 68 is attached to the lower end part of feeding piston 64, and tappet 68 carries out cam 70 Otoko contact. In this example, cam 70 is what formed four projected parts corresponding to the diesel engine of a 4-cylinder. Cam 70 is attached to driving shaft 72 Samurai, and this driving shaft 72 is that which is connected with driving shaft 24 of fuel injection pump 10 up via connecting shaft 74. Driving shaft 72 of feeding machine 12 can also be connected with driving shaft 24 of fuel injection pump 10 by the mechanical connecting means of a belt or others instead of connecting shaft 74. An operation is explained, referring to Drawing 2 below. Drawings 1 and 2 shall show the example of a 4-cylinder, that injection order shall be I, III, IV, and II, and cam 70 of feeding machine 12 shall also synchronize with this timing. Cylinder [ 1st ] injection is performed with the O degrees of crank angle. This is performed by feeding the 1st fuel from fuel injection pump 10 to fuel injection nozzle 14, and when the feeding pressure of the 1st fuel becomes higher than the injection-valve opening pressure of fuel injection nozzle 14, fuel carries out discharge to an organization combustion chamber. At this time, feeding machine 12 is also feeding the 2nd fuel simultaneously. The feeding pressure of this 2nd fuel is set up lower than the injection-valve opening pressure of fuel injection nozzle 14, therefore is lower than the feeding pressure of the 1st fuel. In the 1st cylinder, when check valve 42 provided in 2nd fuel introduction passage 40 of fuel injection nozzle 14 closes, the adverse current to 1st fuel introduction passage [ 2nd ] 40 from fuel introduction passage 36 is prevented, and the 2nd fuel does not enter. Therefore, fuel injection nozzle 14 can be made to open, as mentioned above. In the remaining cylinders, the 2nd fuel is introduced into three fuel injection nozzles 14 from single sending-out mouth 48 of feeding machine 12. The 2nd fuel introduced into 2nd fuel introduction passage 40 of fuel injection nozzle 14 of each cylinder goes into 1st fuel introduction passage 36 that joins by a nozzle bottom part. Since the feeding pressure of the 2nd fuel is higher than the injection-valve opening pressure of check valve 30 of constant-pressure delivery valve 28 provided in discharge passage 26 of fuel injection pump 10 lower than nozzle injection-valve opening pressure, the 1st can carry out fuel introduction passage 36 Otoko penetration, the 2nd fuel putting back the 1st fuel. Thus, the bottom of each fuel injection nozzle 14 is filled up with U7 The and the 2nd fuel, If this fill volume is distributed once to a 3 cylinder for every restoration and sees about 1 cylinder, there will be three restoration distributed such for every injection period, Therefore, the fill volume of the 2nd fuel of each cylinder will be equalized extremely, and Harakki between cylinders of the 2nd fuel supplied every in very small quantities will be lost. At the time of the 4th restoration, it is at the time of injection of that cylinder, and at this time, it carries out like the 1st cylinder explained with the zero degree of crank angle, and injection is performed. And the 1st fuel that the 2nd good fuel of ignition nature was injected previously, and continued after that and was injected can be made to light easily at the time of this injection. Drawing 3 shows the case where cam 70 of feeding machine 12 carries out asynchronous to fuel injection pump 10, and it drives, and shows signs that the 2nd fuel was fed in the middle of injection of each cylinder of fuel injection pump 10. According to this, a total of four restoration of the 2nd fuel is performed among 720 injections from the O degrees of crank angle, for example by the 1st Feeling, and it can be made [ many ] once rather than what was explained in Drawing 2. By this, it can be filled up with the 2nd fuel at the tip of fuel injection nozzle 14 still more certainly. Drawing 4 shows the 2nd example and shows the example which can make the amount of feeding of the 2nd fuel variable by connecting feeding machine 12 with fuel injection pump 10 mechanically, and driving. Feeding machine 12 shown in Drawing 4 has driving shaft 72 connected with driving shaft 24 of fuel injection pump 10 via connecting shaft 74 like Drawing 1, and the same cam 70 as Drawing 1 is attached to this driving shaft 72. In housing 44, cylinder 82 which has feeding hole 80 is fixed, and plunger 84 is inserted into this cylinder 82. This plunger 84 is a thing of the form adopted as the plunger of a side type fuel injection pump, and that Johan part serves as hollow, and it cuts a lead to a peripheral face. Binion is attached to plunger 84 and an angle position is adjusted by control rank 86. By it, a Conservation stroke with feeding hole 80 and a lead can change, and, therefore, it can make the amount of feeding variable. Preferably, control rack 86 is controllable to make the quantity of the 2nd fuel increase at the time of low-temperature starting and high load and a high rotational. Also in this example, feeding machine 12 has single sending-out mouth 48 connected with the 2nd fuel introduction passage of all the fuel injection nozzles 14 in common. Drawing 5 shows the 3rd example of the present invention, and fuel injection pump 10 is constituted by the distributed type fuel injection valve. Distributed type fuel injection pump 10 has plunger 94 which reciprocates by cam 92 which rotates with the driving shaft which is not illustrated and rolls roller 90 top. boat 98 by which pressure room 96 is formed in the tip side of plunger 94, and this pressure room 96 extends the central part of plunger 94 -- distribution passage (discharge passage) 26 -- free passage To shake -- it is common that things have come be made. In this example, the opening of the boat 98 prolonged in the central part of plunger 94 is not carried out at the tip of plunger 94, but an opening is carried out to group 100 provided in the peripheral part near the tip. This group 100 is provided in position where the inhalation group similarly provided in the peripheral part of plunger 94 is another. The tip of plunger 94 is formed as a cylinder cavity side. On the other hand, main part 44 of feeding machine 12 is formed in the shape of [ which closes pressure room 96 ] a cap, and is screwed on the main part of fuel injection pump IO by Nut 102. Feeding piston 64a of feeding machine 12 is extended in pressure room 96 of fuel injection pump 10, and is stopped in the concave shape tip side of plunger 94. For this reason, the end of feeding piston 64a is large A state with the stage, and makes the tip concave of plunger 94 carry out press fit fixation of this stepped edge part. Plunger 94 of fuel injection pump 10 and feeding piston 64a of feeding machine 12 are mechanically connected by this. Since feeding piston 64a of feeding machine 12 can exercise in one with plunger 94 of fuel injection pump 10, It becomes unnecessary, therefore since spring room 60 is unnecessary, return spring 66 as shown in Drawing 1 can form small the compression space area at the tip of feeding piston 64a, and is efficiency about therefore comparatively little 2nd fuel (feeding is possible.). Drawing 6 shows the example in which feeding piston 64b of feeding machine 12 was screwed on at the tip of plunger 94 of fuel injection pump 10, and feed port 46 is provided in the middle of cylinder 62 of feeding machine 12, and also sending-out mouth 48 is provided at the tip of cylinder 62. According to this composition, the structure of feeding machine 12 becomes still easier. It is the same as that of the above-mentioned example to sending-out mouth 48 all the 2nd fuel introduction passage 40 of fuel injection nozzle 14 or to be connected in common. Drawing 7 shows the example which further transformed Drawing 6, and is formed by extending so that feeding piston 64c of feeding machine 12 may project the tip of plunger 94 of fuel injection pump 10 from the pressure room 96, Thus, formed feeding piston 64c is only inserted in cylinder 62 provided in feeding machine 12. About an operation, it is the same as that of the example mentioned above almost. [Effect of the Invention] A feeding machine can be operated, without affecting a feeding operation of the charge injection pump of fuel, since the feeding machine is mechanically connected with the fuel injection pump according to the present invention as explained above, Since the 2nd fuel introduction passage of all the fuel injection nozzles is connected with the single sending-out mouth of the feeding machine in common, it can be filled up with the 2nd fuel without Barranquit. The feeding machine in particular of the present invention does not operate in response to the pressure of the fuel under feeding of a fuel injection pump like conventional technology, Since it connects with the fuel injection pump mechanically, in order to operate a feeding machine, fuel pressure feeding pressure of a fuel injection pump is not consumed, therefore a fuel injection pump enables sharp injection, without falling into a temporary Storage pressure state.

[Brief Description of the Drawings]

It is a figure for Drawing 1 to illustrate the lineblock diagram of the 1st example of the present invention, and for Drawing 2 illustrate the fuel injection of the example of Drawing 1, and fuel restoration, The figure in which Drawing 3 shows the example of change of Drawing 2, the figure in which, as for the lineblock diagram of the 2nd example of the present invention and Drawing 5, Drawing 4 similarly shows the 3rd example, the figure in which Drawing 6 shows the 4th example, and Drawing 7 are figures showing the 5th example. 10 ... Fuel injection pump 12 [ 24 / 36.40 / 46 ... A feed port, 48 ... Sending-out mouth, / ... A fuel introduction passage, 42 ... Check valve / ... A driving shaft, 26 ... Discharge passage ] ... A feeding machine, 14 ... Fuel injection nozzle 64 ... feeding piston, 70 ... cam 72 ... driving shaft, 74 ... connecting shaft.