TWI277692B - Fuel pipe in fuel injection device - Google Patents

Abstract

The fuel pipe of the present invention is provided to discharge discharged fuel to a desired fixed position when fuel containing vapor is discharged outward by releasing an open close valve at a time of engine start. Fuel pipe 1 has a fuel flow passage 1 penetrating the fuel pipe bored therein and is separated into a fuel flow in chamber 6 and a fuel discharge chamber 5 by a vale seat 4 of the fuel flow in passage 1. A flow in side end part Ja of a fuel injection valve J opens in the fuel flow in chamber 6 and a fuel lead in pipe 30 opens, and a drain hole 10 opens in the fuel discharge chamber 5. The valve seat 4 is operated to open and close by a valve element 7 operated by an operation lever 8. At a time of release of valve seat 4 by the valve element 7, vapor remaining in the fuel flow in chamber 6 is discharged to the desired fixed position from the drain hole 10 via an opening part 34a of a drain pipe 34.

Description

1277692 IX. Description of the Invention: [Technical Field] The present invention relates to boosting a fuel in a fuel tank by a fuel pump, and then pumping the boosted fuel to a fuel injection of the engine via a fuel injection valve In particular, the present invention relates to a fuel pipe that is suitable for use in a fuel injection device mounted on a locomotive, an ATV, an outboard engine, a general purpose machine, or the like. [Prior Art] A conventional fuel injection device fuel pipe has a Japanese patent application No. 2 0 0 3 - 1 3 6 7 2 0 as applied by the applicant of the present application. In this case, the fuel pipe is attached to the fixing member. Then, the inflow side hole of the fuel injection valve is connected to the burner of the fuel pipe, and the opening of the fuel introduction pipe is connected from the fuel injection path to the upper side in the gravity direction.

The opening is oriented in the direction of gravity in the direction of the atmosphere to open the atmosphere. Then, the above-mentioned open atmosphere open circuit is closed, and then, when the engine is started, the pump is driven to open and close the fuel pressure in the fuel pipe as an on-off valve, and the atmosphere is opened and the fuel flow path is opened. The fitting end portion is inserted and fixed in the gravity direction of the fuel flow path, and an opening is formed in the fuel flow path of the fuel injection valve. An opening is formed in the fuel flow path of the fuel flow into which the inflow side end portion of the valve is inserted, and is further disposed in the fuel flow path of the fuel introduction pipe, and the opening is formed in the connection path by manual operation. The closed switch valve will be closed. When the start operation is performed by the driver, the fuel is moved to make the fuel pipe, the fuel introduction pipe, and the lift. At this time, if the driver's manual operation is opened, it is convenient to use the fuel pump to boost the pressure. 5 312XP/Invention Manual (supplement)/94-07/94] 09958

1277692 The pressure of the fuel in the piping is directed from the open air passage. When the fuel is discharged, the steam remaining in the piping is discharged for the purpose of piping. At this time, at the uppermost position of the fuel flow path of the fuel pipe, since the discharge path is in an open state, the steam in the pipe can be surely arranged, thereby improving the engine's thermal restart and the engine starting performance. (Patent Document 1) Japanese Patent Application No. 2 0 0 3 - 1 3 6 7 2 0 [Problem to be Solved by the Invention] According to the fuel pipe of the conventional fuel injection device, if the engine is manually operated The open valve is opened by opening and closing the valve, and the containing steam will be discharged and scattered around the fuel pipe. Accordingly, the fuel is placed on the machine around the fuel pipe, and the fuel is more likely to adhere to the number of times the machine is repaired. Moreover, the scattered fuel will be attached to the driver, and the locomotive is more disadvantageous. Moreover, the fuel connector portion disposed near the fuel pipe is also likely to adhere to the fuel. The fuel pipe of the fuel injection device of the present invention has been completed in view of the above, and a first object is to provide a fuel discharge by a predetermined operation when the fuel containing steam is discharged to the outside when the engine is started. At a certain position, the fuel is prevented from adhering to the peripheral machine including the valve, and the fuel is attached to the on-off valve, and the electrical connector of the fuel injection valve 312XP/invention specification (supplement)/94-07/94109958 can be suppressed. Atmospheric venting gas will also be the same as the opening of the atmosphere when the outside is started. The fuel of the gas will adhere to the foreign matter. It is necessary to open the fuel injection to the driver's body, especially for the problem of the injection valve.

1277692 Fuel pipe for fuel. (Means for Solving the Problem) In order to achieve the above-described characteristics, the fuel pipe of the fuel injection device of the present invention boosts the fuel in the fuel tank by the fuel pump, and then passes the fuel through the fuel injection valve to eject the fuel supplied to the engine. The utility model is characterized in that a fuel pipe is arranged inside the fuel flow path and fixed on the arrangement member, and is below the gravity direction of the fuel flow path, and enters the injection valve support hole supporting the inflow side end portion of the fuel injection valve, and the Φ widening support hole is further The fuel flow path at the upper position is divided into a closed fuel flow inflow chamber and a closed fuel discharge chamber, and the fuel introduction pipe opening portion is opened by the normally closed valve, and the inflow side end of the fuel injection valve is inserted through the through hole. In addition, a drain hole is provided in the fuel discharge chamber, and the drain hole is connected to the drain hole, and the atmosphere side opening of the drain pipe is opened at a predetermined position. The second feature of the present invention is the above-described first feature. The atmosphere side opening of the drain pipe is opened in the fuel tank. According to a third aspect of the present invention, in addition to the first aspect, the atmospheric side opening of the drain pipe is connected to a return fuel passage of the pressure regulator. According to a fourth aspect of the present invention, in the normally closed switch valve according to the first aspect, the fuel discharge gas is insulated by the second spring while the valve is closed toward the valve seat by the first spring. The operating member of the sealing member is isolated and formed by the elastic force of the first spring and the second spring, so that the valve 312XP/invention specification (supplement)/94-07/94109958, the first one has been boosted The injection device is formed in the fixed structure to form a plug-in and a spray-type switch chamber; the upper injection valve branch is at the above-mentioned drain. In addition, in addition to the passage, the above-mentioned body and the chamber 5 and the large-bar counteracting body generate 1277692 to open the valve seat. According to a fifth aspect of the present invention, in addition to the fourth aspect, the operation lever is operated by an electromagnetic device D formed of an electromagnetic coil, a movable iron core, and a fixed iron core. According to a sixth aspect of the present invention, in addition to the fifth aspect, the electromagnetic device is energized while the engine is being driven by a self-starting motor, and the operating lever is operated by the movable iron core. Open the valve body.

According to a seventh aspect of the present invention, in addition to the fourth feature described above, a gap is formed between the operating lever and the valve body in the non-operating state of the operating lever. According to an eighth aspect of the present invention, in addition to the fourth aspect, the outer end of the pressing portion of the operating lever is located further inward than the outer end of the fuel pipe in the non-operating state of the operating lever. (Effect of the Invention) According to the first feature of the present invention, for example, when the engine is thermally restarted, the fuel pump is electrically driven and the normally closed switching valve is manually operated, and the valve seat is opened, and the fuel inflow chamber is connected to the fuel discharge chamber. through. In this case, the vapor accumulated in the fuel introduction pipe and the fuel inflow chamber flows into the fuel discharge chamber together with the boosted fuel, and then the fuel containing the vapor is discharged through the drain hole and the drain pipe. position. Therefore, it is possible to continuously and stably supply the fuel containing no vapor from the fuel injection valve to perform a good heat restart of the engine. 3] 2XP/Invention Manual (Supplement)/94-07/94109958 1277692 Furthermore, since the above-mentioned steam-containing fuel can be discharged by a discharge pipe away from a predetermined position of the fuel pipe, the fuel pipe and the fuel pipe are Fuel and foreign matter are not attached to the surrounding machine, and the fuel tube can be kept clean for a long time, and the swelling and deterioration of rubber, resin, and the like derived from the adhesion of the fuel can be suppressed. In particular, the electrical connector portion of the fuel injection valve mounted on the fuel pipe does not adhere to the fuel, and the stability of the electrical connection can be maintained for a long period of time. Furthermore, by discharging the fuel containing vapor from the discharge pipe away from the fuel pipe, it is possible to suppress the fuel from adhering to the driver who controls the on-off valve, especially for a driver such as a locomotive. It is more advantageous in the vicinity of the fuel pipe. Further, the operation of the fuel pump can be confirmed by confirming the above-described fuel discharge from the drain pipe. Further, according to the second aspect of the present invention, the steam-containing fuel that opens and closes the switching valve and flows down from the drain pipe is returned to the fuel tank. According to this, because the fuel will not be wasted, it will suppress the deterioration of fuel economy, and the fuel will not be evaded in the atmosphere, which is advantageous for preventing atmospheric pollution.

Further, according to the third aspect of the present invention, the vapor-containing fuel that opens the switching valve and flows down from the drain pipe flows into the oil return passage of the pressure regulator and then returns to the fuel tank. According to this, when the fuel in the drain pipe is returned to the fuel tank, since the oil return passage of the pressure regulator is utilized, the length of the drain pipe can be shortened, and it is not necessary to pass a new refueling fuel opening in the fuel tank. The conventional fuel tank can be directly used. Furthermore, according to the fourth feature of the present invention, the on-off valve system utilizes the operating lever and the 9 312XP/invention specification (supplement)/9^07/94109958

1277692 The valve body is isolated and formed, and in the non-operating state of the operating lever, the second spring is applied to the side of the closing valve to give an elastic force, and the valve body is held by the spring to be held on the valve seat, thereby the fuel flowing into the chamber and the fuel Emissions are kept in isolation. On the other hand, if the operating lever is pressed against the second spring force, the operating lever is more resistant to the elastic force of the first spring, so that the valve body is far away from the valve seat, thereby allowing the fuel inflow chamber to communicate with the fuel discharge chamber. Therefore, the vapor retained by the fuel flowing into the room will be discharged from the drain pipe through the valve seat φ discharge chamber and the drain hole. Further, since the operating lever is provided with the fuel discharge chamber and the atmosphere blocking member, the fuel flowing into the fuel discharge chamber will not leak to the atmosphere side around the rod. According to the above, even if the center of the pressing direction of the operating lever is arranged eccentrically with the center of the valve body, the valve seat of the valve body can always maintain the occlusion property. Furthermore, the first spring force of the valve body pressed toward the valve seat can be selected regardless of the second spring force of the operating rod, and can be set to be weak, thereby reducing the wear of the valve body to the valve seat, and can be long Maintain valve occlusion. Furthermore, according to the fifth feature of the present invention, the movable iron core can be produced by energizing the electromagnetic coil of the engine starting electromagnetic device, whereby the movable iron core can move the operating rod, and the movable rod can be moved. The valve seat is open, which can automatically discharge the vapor-containing fuel from the drain pipe. On the other hand, after the engine is started, the pole will be cut by the electromagnetic coil 312XP/invention manual (supplement)/94-07/94109958. The chamber is pressed to the side and connected to the valve seat. The fuel-tight switch is well-operated for the elastic force. When it is stable, it is vivid and automatic. Bypassing 10 1277692, the valve seat can be automatically closed again. According to the above, particularly for the locomotive, the operability can be greatly improved by performing the above-described electric switching operation while the driver is riding on the locomotive. Furthermore, according to the sixth feature of the present invention, when the engine is started, the solenoid of the electromagnetic device is energized during the driving of the starter motor, the valve seat is automatically opened, and the vapor-containing fuel is automatically removed from the drain pipe. release. Further, if the drive of the self-starting motor is stopped, the energization of the electromagnetic coil is cut off, and the valve seat is again kept in the closed state.

According to the above, since the valve body operation is performed in synchronization with the self-starting motor, the steam can be surely discharged every time the engine is started. Moreover, the driver's operation only needs to perform the driving operation of the self-starting motor, and does not require special valve body operation, thereby improving operability. Furthermore, according to the seventh feature of the present invention, in the non-operating state of the operating lever, a gap is formed between the operating lever and the valve body. Therefore, in the non-operating state of the operating lever, since the valve body and the operating lever are kept in a non-contact state, the valve body is reliably pressed against the valve seat by the first spring, and the valve seat can be maintained in good occlusion. . Further, during the operation of the engine, even if the operating lever is slightly vibrated, the operating lever will not open as the valve body, and the valve seat can be kept in a closed state. In addition, the opposing portions of the operating rod and the valve body will not collide with each other. According to the eighth aspect of the present invention, in the non-operating state of the operating lever, the outer end of the pressing portion of the operating lever is disposed at a position closer to the inner side than the outer end of the fuel pipe. In this case, especially the knight riding the locomotive accidentally touched the operation 11 312XP / invention description ® patch) /94-07/94 ] 09958

1277692 Rod, and the condition of the lever is pressed. In the course of running, the contact of the operating lever is bumped into other objects, resulting in breakage or bending of the operating lever, and the operability of the operating lever can be maintained for a long period of time. [Embodiment] Hereinafter, a fuel pipe of a fuel injection device according to the present invention will be described with reference to Figs. 1 and 2 . BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the overall configuration of a fuel injection of a fuel pipe of the present invention mounted on an intake pipe; Fig. 2 is an enlarged longitudinal sectional view showing an important portion of a fuel pipe. First, the overall structure of the fuel injection device will be described. The 0 0 system internally penetrates the throttle body (thr 〇 11 1 eb 〇 dy ) through which the intake passage 1 1 is bored; and the intake passage 1 1 rotatably supports the throttle shaft 1 2 on the valve body 10 , installed butterfly throttle 1 3 switch control. Then, the upstream side 1 1 a of the intake passage 1 1 of the throttle body 10 is connected to the air cleaner A, and the downstream side 1 1 b is connected to the fuel tank in which the fuel is stored in the T system through the intake pipe 20. The fuel in the fuel tank T is sucked into the fuel pump P by the fuel suction passage Pa and pressurized, and the passed fuel is supplied to the fuel introduction pipe 3 via the fuel discharge path P b. a fuel pressure supplied from the fuel pump P and flowing into the fuel introduction pipe, adjusted to a predetermined fuel pressure; an oil return passage 31 disposed on the fuel introduction pipe 30 and discharging excess fuel of the pressure regulator R, It is connected to the fuel tank T. 312XP/Invention Manual (Supplement)/94-07/94109958 There are cases where the shot is attached to the engine and the engine is boosted and connected. 12 1277692 Therefore, use air filter and cleaner A to remove foreign matter. The air, which will flow into the intake passage 1 of the throttle body 10, is controlled by a throttle valve 13 operated by the driver, and the controlled air is supplied to the engine E via the intake pipe 20. .

On the other hand, the fuel in the fuel tank T is boosted by the fuel pump P and supplied to the fuel introduction pipe 30, and the fuel flowing into the fuel introduction pipe 30 is regulated by the pressure regulator R to The predetermined fuel pressure is established, and the excess fuel of the pressure regulator R will return to the fuel tank T 经由 via the oil return passage 31. Inside the fuel pipe system, a fuel flow path 2 penetrating in the vertical direction is formed, and an injection valve support hole 2 a is opened downward below the fuel flow path 2, and a pilot hole 3a is screwed over the fuel flow path 2 Rod guide pin 3. The upper outer end 1a of the fuel pipe 1 is formed by the upper end 3b of the operating lever guide 3. Further, a valve seat 4 is formed slightly in the middle of the fuel flow path 2, and the valve seat 4 is divided into a fuel discharge chamber 5 that faces the fuel flow path 2 upward and a downward direction.

The fuel flows into the chamber 6. The injection valve support hole 2a is opened in the fuel inflow chamber 6. 7 is a valve body that is disposed to face the valve seat, and the valve body 7 is pressed against the valve seat 4 by the first spring S1, and the valve seat 4 is closed. The valve body 7 is provided with a valve rod 7a disposed in the fuel inflow chamber 6 and disposed to face the wide seat 4, and protruding upward from the valve body 7 in the fuel discharge chamber 5, the first spring S1 The lower end S1 a is fastened to the engaging portion 4 a formed on the inner side of the valve seat 4 , and the upper end S 1 b is engaged with the valve rod 7 a 13 312XP / invention manual (supplement) / 94-07/94 ] The flange portion 7b of 09958 1277692. The operating rod disposed in the 8 series fuel discharge chamber 5, the shaft portion 8a of the operating rod 8 is movably supported in the guide hole 3a of the operating rod guide 3 in the axial direction, and the lower end 8b of the operating rod 8 is The opposite ends are disposed on the upper end of the valve rod 7a. The operation lever 8 is pressed toward the valve closing direction side (upward in the drawing) by the second spring S 2 , and the lower end S 2 a of the second spring S 2 is engaged with the engaging portion 5 a of the fuel discharge chamber 5, The upper end S 2 b is then snapped under the catching section 8 c of the operating lever 8. As described above, the operation lever 8 is pressed toward the side of the valve closing side Φ (upward in the drawing) by the second spring S 2 , and the upper direction moves the upper surface of the engaging portion 8 c of the operating lever 8 to abut against the operation. The engaging portion 3c of the rod guide pin 3 is positioned and regulated.

The upper stop position of the operating lever 8 is a non-operating state in which no external force is applied to the operating lever 8, and in this state, the outer end 8d of the pressing portion of the operating lever 8 (in other words, the upper end of the operating lever 8 in the drawing), It will be located further inside than the outer end 1a of the fuel pipe 1 (in other words, the upper end of the operating rod 8 is located lower than the upper end 3b of the operating rod guide 3). Further, in the non-operating state of the operating lever 8, the lower end 8b of the operating lever 8 is disposed to face the upper end of the valve stem 7a of the valve body 7, and a gap c is formed in the space between the opposing spaces. Further, reference numeral 8 denotes a sealing member such as a lip seal (1 ipsea 1 ) disposed between the inner diameter portion of the lever of the operation lever 3 and the outer peripheral portion of the shaft portion 8 a of the operation lever 8; and the L system is disposed on the operation lever guide. The seal between the outer periphery of the plug 3 and the fuel discharge chamber 5 is an O-ring. According to the above, the fuel in the fuel discharge chamber 5 is prevented from leaking to the outside via the guide hole 3a of the rod guide 3 of the operation 14 312XP/invention specification (supplement)/94-07/94] 09958 1277692, and Also, the fuel in the fuel discharge chamber 5 does not leak through the outer periphery of the operating rod guide pin 3 to the outside. Therefore, the drain hole 10 is opened in the fuel discharge chamber 5, and the opening portion 30a of the fuel introduction pipe 30 is opened in the fuel inflow chamber 6. The above-described fuel pipe 1 is again simplely arranged as follows. The fuel pipe 1 forms a fuel flow path 2 in the up and down direction, and forms a wide seat 4 at the center, and the fuel flow path 2 will be divided into a fuel inflow chamber 6 by the valve seat 4 in the lower direction of the gravity direction, and is distinguished above it. A fuel discharge chamber 5 is formed. Further, the valve body 7 is disposed adjacent to the valve seat 4, and the valve body 7 is supported by the valve seat 4 by the first spring S1. An operating lever 8 is disposed in the fuel discharge chamber 5. The lower end 8 b of the operating rod 8 is disposed adjacent to the upper end of the valve rod 7 a and the outer end 8 d of the pressing portion of the operating rod 8 is adjacent to the outer end 1 a of the fuel tube 1 and is disposed outwardly, and the operating rod 8 is utilized. 2 The spring S 2 is given an elastic force toward the valve closing direction side.

Further, an injection valve support hole 2a is opened downward at the lower end of the fuel inflow chamber 6, and an opening portion 30a of the fuel introduction pipe 30 is opened. Further, a drain hole 10 is opened in the fuel discharge chamber 5. Then, the fuel pipe system is fixed to the intake pipe 20 by the following, and the fuel pipe is executed. The inflow side end portion J a of the fuel injection valve J is inserted into the injection valve support hole 2 a of the fuel pipe 1 , and in this case, the fuel inflow hole formed in the inflow side end portion J a is disposed in the fuel inflow hole. The direction of gravity in 6 is below. Next, in the groove 1 b 15 312XP/invention specification (supplement)/94-07/9410995 8 1277692 of the outer periphery of the fuel pipe 1 into which the fuel injection valve J has been inserted, a flat mounting plate 3 2 is mounted, and the fuel is injected. The front end portion Jb of the valve J is inserted into the guide hole 20a which is bored in the intake pipe 20, and in this state, the mounting plate 3 2 is disposed on the fixing member 2 which is formed to protrude toward the outer periphery of the intake pipe 20 0 b is screwed and fixed to the fixing member 20 b by a locking member 3 3 such as a screw. According to the above, the fuel pipe 1 is fixed to the intake pipe 20 through the mounting plate 32, and the fuel injection valve J Then, the fuel pipe 1 and the intake pipe 20 are held by each other.

On the other hand, the fuel discharge path Pb of the fuel pump P is transmitted through the opening portion 30a of the fuel introduction pipe 30, is connected to the fuel inflow chamber 6 of the fuel pipe 1, and is connected to the drain hole 10 of the fuel pipe 1. The drain pipe 34 is placed, and the atmosphere side opening portion 34a of the drain pipe 34 is opened to an appropriate position. Next, the effect will be described. In the case where the fuel introduction pipe 30 and the fuel in the fuel pipe 1 are heated in a state where the fuel is greatly heated, for example, when the engine is restarted, the description will be made. The driver first performs a starting operation, whereby the electric circuit such as the electric fuel pump P and the spark plug will be energized, the fuel pump P will be driven and sucked into the fuel in the fuel tank T and boosted, and the boosted fuel will be The fuel introduction pipe 30 and the fuel inflow chamber 6 in the fuel pipe 1 are supplied to increase the fuel pressure in the fuel pipe. In this state, the driver pushes the operating lever 8 against the spring force of the second spring S 2 downward, and pushes the valve body 7 downward against the elastic force of the first spring S1 to keep the valve seat 4 open. The valve seat open state of the valve body 7 is as shown in FIG. If the valve seat 4 is opened, the boosted fuel is maintained in the fuel inlet pipe 30 and the fuel pipe 1 in the fuel injection pipe 16 312XP / invention manual (supplement) / 94-07 / 94109958 1277692 material inflow chamber 6 Together, it is discharged to the outside through the valve seat 4, the fuel discharge chamber 5, the drain 孑L 1 0, the drain pipe 34, and the opening portion 34a, and the vapor having a smaller specific gravity than the fuel will flow with the fuel, together with the drain pipe When the opening portion 30 0 of the 30 is discharged to the outside, the vapor in the fuel introduction pipe 15 and the fuel inflow chamber 6 can be removed. Therefore, if the driver performs the engine start operation again, only the predetermined fuel that has been boosted by the fuel pump P and that does not have the steam is supplied from the fuel injection valve J to the intake pipe 20, and the actual fuel can be surely The engine is restarted again. After the engine is started, since the correct fuel is continuously supplied to the engine by actively discharging the steam to the outside, stable running performance can be obtained immediately after starting. Furthermore, in the state where the engine is placed for a long period of time (the engine is not used for a long period of time), the starting operation will perform the same starting operation as in the case of the hot restart.

According to the above, the fuel deteriorated by the long-term placement is discharged to the outside from the opening portion 34a of the drain pipe 34, and the new fuel can be supplied from the fuel injection valve J to the engine E, even after being placed for a long period of time. Perform a definite engine start. Here, the fuel pipe 1 of the present invention is characterized in that the fuel flow path 2 in the fuel pipe 1 is formed by the fuel discharge chamber 5 sealed by the valve seat 4, and the drain hole 10 is opened in the fuel discharge chamber 5, and The draining iL 10 is connected to the drain pipe 34, and opens the opening portion 34a of the drain pipe 34 at a predetermined position. In this case, when the valve body 7 is operated by the operation of the operating lever 8, the valve inlet 4 can be opened, and the fuel introduction pipe 30 and the fuel inflow chamber 6 can contain 17 312XP/invention specification (supplement)/94. -07/94109958 1277692 The fuel of the vapor is discharged through the opening portion 34 4 a of the drain pipe 34 from an appropriate place away from the operation pipe 1 and does not leak fuel from around the operating rod 8, so that the fuel pipe 1 can be dissipated around the fuel pipe 1 The fuel causes the fuel pipe 1 and the surrounding area to be contaminated, and the fuel, resin, and the like disposed around the fuel are restrained from adhering to the fuel, and swelling and deterioration occur. Further, since the fuel does not scatter toward the fuel injection valve J electrical connector portion disposed adjacent to the fuel pipe 1, the electrical connection period can be maintained in a good state.

Further, since the fuel formed by the fuel discharge chamber 5 and closed from the fuel discharge chamber 5 to the outside will be discharged only from the position away from the drain pipe 34, the driver who operates the lever will not adhere. Fuel is especially beneficial to locomotive knights. Further, by performing the starting operation of the engine and opening the valve seat, it is confirmed that the fuel pump P is normally driven by confirming the outflow of the fuel from the drain pipe 34, and thus the drive confirmation of the fuel pump can be performed extremely simply. . Further, if the opening portion 34a of the drain pipe 34 is opened in the fuel tank T, the fuel discharged from the drain pipe 34 can be returned to the fuel tank T again, so that the surroundings are completely fuel-free. In the case of scattering, the fuel can be used effectively, and by evaporating the fuel, the air can be prevented from being contaminated. Further, if the opening portion 34a of the drain pipe 34 is opened in the oil return passage 31 of the pressure regulator R, it is not necessary to provide a new fuel opening portion in the fuel tank T, and the conventional fuel can be directly used. Fuel tank T. Moreover, the length of the drain pipe 34 can be shortened to correspond to the length of the oil return passage 31, and the piping layout of the drain pipe 34 can be improved. 18 312XP/Invention Manual (Supplement)/94-07/94109958 1277692 Further, if the normally closed switching valve of the switch valve seat 4 is opened by the valve body 7 disposed adjacent to the valve seat 4, and the valve body 7 is opened. When the operating lever 8 is formed in isolation, even if the center of the pressing of the valve body 7 and the center of the pressing of the operating lever 8 are eccentrically arranged, the occlusion of the valve body 7 against the valve seat 4 can be maintained in a good state. Even if the operating lever 8 is disposed, for example, in an inclined configuration, the valve body 7 is not adversely affected. In addition, when the first spring S1 that elastically biases the valve body 4 is applied to the valve body 7, and the second spring S2 that biases the operating lever 8 toward the valve seat closing direction is disposed separately, the first spring S1 is disposed. The elastic force is sufficient as long as the valve body 7 closes the required force of the valve seat 4, so that the valve body 7 can be pressed toward the valve seat 4 according to an appropriate elastic force, and the wear of the valve body 7 and the valve seat 4 can be reduced. Further, by providing the sealing member 9 by the operating lever 8, the airtightness of the fuel discharge chamber 5 can be maintained. Further, in the non-operating state of the operating lever 8, if a gap c is formed between the lower end 8b of the operating lever 8 and the upper end of the valve stem 7a of the valve body 7, the dimensional accuracy of the operating lever 8 and the valve body 7 is poor. In the case of

The operating lever 8 abuts against the valve body 7, causing the valve body 7 to accidentally open the valve seat 4. Further, in the operation of the engine, even if the operating lever 8 is slightly vibrated in the longitudinal direction, the operating lever 8 does not abut against the valve body 4 and is repeatedly closed, or the collision sound is generated, and the contact with the valve body 4 is worn. The situation has occurred. Further, when the outer end 8d of the pressing portion of the operating lever 8 is disposed further inside than the upper end 3b of the operating lever guide pin 3 (in other words, the outer end 8d of the pressing portion of the operating lever 8 is 312XP / invention manual (supplement) /94-07/94109958 . 19 1277692 position on the inner side of the outer side of the fuel pipe 1, so that the driver does not accidentally touch the operating lever 8 and presses the operating lever The situation of 8 occurs. Further, during running, the operating lever 8 is not bent or damaged by touching other members, and the operating lever 8 can be well protected. These phenomena are particularly effective when the fuel pipe 1 is directly disposed as a locomotive exposed to the air. Next, another embodiment of the fuel pipe of the present invention will be described using Fig. 4 .

In the same configuration as in Fig. 2, the same component symbols are used and the description is omitted. The electromagnetic system in which the D system electrically manipulates the operating lever 8 is formed as follows. The 40-center has a cylindrical portion 40a, and has a flange portion 40b extending toward the side below the cylindrical portion 40a, and a coil having a flange portion 40c extending toward the side at the upper side. Winding. The coil winding 40 is formed of a synthetic resin material of an insulating material, and an electromagnetic coil 40d is wound around the outer circumference of the cylindrical portion 40a. 4 1 is a lower magnetic pole piece 4 1 a disposed at a flange portion 4 0 b of the coil winding 40, and a lower side formed by a fixed iron core 4 1 b inserted into the cylindrical portion 40 a. The magnetic pole is formed of a magnetic material. Further, the lower magnetic pole 4 1 is provided with an insertion hole 4 1 c penetrating from the upper surface of the fixed iron core 41 b toward the lower surface of the lower magnetic pole piece 4 1 a in the vertical direction. 4 2 is disposed on the upper magnetic pole piece on the flange portion 40 c above the coil winding 40, and in the cylindrical portion 40 a of the coil winding 40, opposite to the fixed iron core 4 1 b The movable iron core 43 is movably disposed, and the movable iron core 20 312XP/invention specification (supplement)/94-07/94109958 1277692 4 3 is formed of a magnetic material. The 4 4 series is a housing formed of a magnetic material in a state surrounding the outer circumference of the electromagnetic coil 40 d. The casing 44 is a member that combines the magnetic pole pieces 4 1 a of the lower side and the magnetic pole pieces 4 2 of the upper side. When the electromagnetic coil 40 d is energized, a magnetic circuit is formed by the upper pole piece 4 2, the movable core 4 3 , the fixed core 4 1 b , the lower pole piece 4 1 a , and the casing 4 4 . Furthermore, in the present embodiment, the lower end of the housing 44 is engaged with the flange portion 3d of the operating lever guide 3, and the upper end is engaged with the non-magnetic member 45 disposed on the upper pole piece 42. .

According to the above, the electromagnetic device D is attached to the upper end of the fuel pipe 1 by screwing the operation lever guide 3 to the upper opening portion 2b of the fuel flow path 2 of the fuel pipe 1. Then, in a state where the electromagnetic device D is attached to the fuel pipe 1, the small-diameter shaft portion 8e that protrudes upward from the shaft portion 8a of the operating lever 8 passes through the lower-side magnetic pole piece 4 1 a and the fixed iron core. 4b is inserted into the insertion hole 4 1 c, and the upper end is abutted on the lower end surface 4 3 a of the movable iron core 43. Accordingly, the elastic force of the second spring S 2 is responsible for the fact that the operating lever 8 is biased upward. Second, explain its role. When the electromagnetic coil 40d is not energized, since the electromagnetic coil 40d does not form any magnetic circuit, the movable core 4 is disposed with the operating lever 8 pressed upward by the elastic force of the second spring S2. , the state of being pressed to the top position. This state is shown in Fig. 4. A gap c is formed between the lower end 8b of the operating lever 8 and the valve stem 7a of the valve body 7, and at the lower end of the movable iron core 4 3 a, 21 312XP / invention manual ( A gap d is also formed between the fixed part/94-07/94109958 1277692 and the upper end 4 1 d of the fixed iron core 4 1 b. Therefore, the valve body 7 maintains the valve seat 4 in the closed state by the elastic force of the first spring S1. ^ Secondly, when the engine is restarted during engine warm-up or when the engine is placed for a long period of time, the solenoid 40d is energized with the engine starting operation. In this case, the electromagnetic coil 40 d forms a magnetic circuit between the upper pole piece 4 2 , the movable iron core 4 3 , the fixed iron core 4 1 b , the lower pole piece 4 1 a , and the casing 4 4 . By the magnetic force generated thereby, the movable iron core 4 3 is moved toward the fixed iron core 41 b side (lower in FIG. 4 ) against the elastic force of the first φ 1 spring S1 and the second spring S 2 . According to the movement of the movable iron core 43, the operating lever 8 and the valve body 7 are also moved downward in synchronization, and the valve body 7 opens and holds the valve seat 4, so that the fuel introduction pipe 30 and the fuel inflow are as in the above embodiment. The vapor retained in the chamber 6 is discharged together with the fuel through the drain hole 10 and the drain pipe 34, and a good engine start can be performed.

According to the second embodiment, when the engine is started, the driver can perform the energization operation of the electromagnetic coil 40d of the electromagnetic device D, and thus the operating lever 8 can be operated in comparison with the mechanical pressing. The operability of the operating lever 8 is greatly improved. Especially for locomotives, the driver can perform the above-mentioned energization operation in the riding state. Further, the energization time can be performed in a short period of time at the beginning of the engine start, so that it does not consume too much battery power, and is suitable for a locomotive having a smaller battery capacity than a four-wheeled vehicle. 22 312XP/Invention Manual (Supplement)/94-07/94109958 1277692 Furthermore, the electromagnetic coil 40 d of the above electromagnetic device is energized, and when the engine is started, it is synchronized with the self-starting motor when the self-starting motor is driven. Execution can discharge the trapped steam frequently when the engine is started, which can improve the startability. Further, if the electromagnetic coil 40 d is coupled in series to the electric igniting circuit of the self-starting motor, the power switch for energizing the electromagnetic coil and the operation of the above power switch are not required. Further, when the engine starts to vibrate and the vibration is completed, the driving of the self-starting motor φ is released, and the electromagnetic coil 40 d is automatically turned off. Fig. 5 shows still another embodiment of the fuel hose of the present invention. Only for different parts. The fuel pipe 205 includes a first fuel flow path 5 1 a ' formed in the vertical direction and a second fuel flow path 5 1 b formed from the upper end of the first fuel flow path 51 a toward the left side, and the second fuel The valve seat 4 is formed in the flow path 5 1 b, thereby being divided into the fuel inflow chamber 6 and the fuel discharge chamber 5

Then, the injection valve support hole opened below the fuel inflow chamber 6 is inserted into the end portion on the inflow side of the fuel injection valve J, and the fuel introduction pipe 30 is connected to the upper end side of the fuel inflow chamber 6 and opened. On the other hand, in the fuel discharge chamber 5 formed to the left side, a drain hole 10 is opened downward, the drain hole 10 is connected to the drain pipe 34, and the atmosphere side opening portion 34a of the drain pipe 34 is opened. Established at a certain location. Further, the valve body and the operating lever are the same as in the first embodiment, and thus the same component symbols are used. According to the fuel pipe, since the fuel discharge chamber 5 and the fuel introduction pipe 30 are arranged 23 312XP / invention manual (supplement) /94-07/94109958 1277692

On the side side, the A degree 5 of the axial direction XX of the fuel injection valve J can be shortened. In particular, when the suction pipe is arranged under the seat cushion and the fuel tank as in the locomotive, the whiteness of the configuration can be improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the overall configuration of a fuel injection device equipped with a fuel pipe of the present invention. Fig. 2 is an enlarged longitudinal sectional view of an important part of the fuel pipe of the present invention. Fig. 5 is a closed state of the valve seat. Fig. 3 is Fig. 2 The valve seat of the fuel pipe is shown in an open state. FIG. 4 is an enlarged longitudinal sectional view of another embodiment of the fuel pipe of the present invention. FIG. 5 is an enlarged longitudinal section of another embodiment of the fuel pipe of the present invention. Figure 0 [Main component symbol description] 1 Fuel pipe la outside 2 lb groove 2a fuel injection valve passage hole supporting an end portion 3c section 4 snap valve seat 3] 2XP / present specification (complement member) / 94-07 / 9410995 8241277692 3 on the guide pin guide hole 3a 3b

4 a Snap section 5 Fuel discharge chamber 5a Snap section 6 Fuel inflow chamber 7 Valve body 7a Valve rod 7b rim portion 8 Operating rod 8a Shaft portion 8b Lower end 8 c Clamping portion 8d Outer end 8 e Trail Shaft portion 9 Sealing member 10 Λ/r That is, valve body 11 Intake passage 11a Upstream side lib Downstream side 12 Flow valve shaft 13 gp Flow valve 20 Suction tube 20a Guide hole 20b Fixing member 30 Fuel introduction tube 312XP / Invention manual (supplement) /94-07/94109958 25 1277692

30a opening portion 31 oil return passage 32 mounting plate 33 locking member 34 drain pipe 34a atmospheric side opening portion 40 coil winding 40a cylindrical portion 40b lower flange portion 40c upper flange portion 40d electromagnetic coil 41 lower magnetic pole 4 1a Lower pole piece 41b Fixed iron core 41c Inserting hole 42 Upper side pole piece 43 Movable iron core 44 Housing 45 Nonmagnetic member 50 Fuel pipe 5 1a First fuel flow path 51b Second fuel flow path A Air filter c Clearance 312XP /Invention manual (supplement)/94-07/94109958 26 1277692

D Electromagnetic device d Clearance E Engine J Fuel injection valve J a Inflow side end Jb Front end L 0 Ring P Fuel pump Pa Fuel suction path Pb Fuel discharge path R Regulator SI First spring SI a Lower end Sib Upper end S2 2nd spring S2a lower end T fuel: 螬 312XP / invention manual (supplement) /94-07/94] 09958 27

Claims (1)

1277692 X. Patent Application Range: 1. A fuel pipe of a fuel injection device is a fuel injection device that boosts a fuel pump in a fuel tank and supplies the boosted fuel through a fuel injection to an engine. A fuel pipe (1) having a fuel flow path (2) and fixedly disposed on a fixed structure is inserted into a side end portion of the fuel injection pipe (2) in the gravity direction of the fuel flow path (2) J b ) spray I hole (2 a ), and at the same time, the upper position of the injection valve support hole (2 a ) is Φ (2), and the normally closed switch valve (7) is used to distinguish the closed combustion (6) with a closed fuel discharge chamber (5); opening an opening of the fuel introduction pipe (30) in the fuel inflow chamber, and inserting an inflow side end portion (Jb) of the fuel injection through the injection valve support hole (2a); Further, a drain hole (10) is formed in the fuel discharge chamber, a drain pipe (34) is connected to the drain hole, and a large portion (34a) of the drain pipe (34) is opened at a predetermined position. 2. In the fuel injection device according to the first aspect of the patent application, the atmosphere side opening portion (34 a) of the drain pipe is opened. 3. In the fuel injection device according to the first aspect of the patent application, the atmospheric side opening (34a) of the drain pipe is connected to the oil return passage (3 1 ) of the V. 4. In the fuel injection device of claim 1, the normally closed switching valve is oriented toward the fuel of the 3] 2XP/invention specification (supplement)/94·07/94109958 using the first spring (S 1 ) The injection valve, the spray (20b) side, forms the fuel flow of the f-valve into the chamber portion (30a), the injection valve (J) simultaneously opens the material tube on the gas side, and its I chute (T) material tube, 3 pressure device (R) material tube, its seat (4) 28 1277692 The valve body (7) is pressed, and the second bomb is used to isolate the fuel discharge chamber (5) from the atmosphere by a sealing structure j (8), and the operating rod (8) is used to counter the first 1 The elastic force of the spring (S 2 ) is pressed and pressed to open the valve body (7). 5. The fuel injection device of claim 4, wherein the operating lever is produced by an electromagnetic device (D) formed by an electromagnetic coil (40d) and a fixed iron core (4 1 b ). In the fuel injection device of claim 5, the electromagnetic device is driven by the engine from the starter motor, and the operating lever (8) is moved open by the movable iron core (43). 7. In the fuel injection device of claim 4, in the non-operating state of the operating lever, a gap (C) is formed between the operating levers. 8. In the fuel injection device of claim 4, in the non-operating state of the operating lever, the operating lever (the side end (8d) is located closer to the outer end (1a) of the fuel pipe (1). 3] 2XP/Invention Manual (Supplement)/94-07/94] 0995 8 Spring (S 2 ) Pressing the f ( 9 ) operating lever spring (S1 ), the second active action, the valve fuel pipe, The factory is moving iron anger (4 3 ). The fuel pipe, during which the fuel pipe of the valve body (7) is operated, the fuel pipe of (8) and the valve body (7), 8) The side of the press is outside the side position.