JP4123178B2 - Fuel pipe in fuel injector - Google Patents

Description

  The present invention relates to a fuel injection device that boosts the fuel in a fuel tank by a fuel pump and supplies the boosted fuel to an engine via a fuel injection valve, and in particular, a motorcycle, a buggy, an outboard motor, and a general purpose The present invention relates to a fuel pipe of a fuel injection device suitable for being mounted on a machine or the like.

Japanese Patent Application No. 2003-136720 filed by the present applicant is known as a fuel pipe of a conventional fuel injection device.
According to this, the fuel pipe has a fuel flow path formed therein and is fixedly disposed on the fixing member.
An inflow side end portion of the fuel injection valve is inserted and disposed below the fuel flow path in the direction of gravity, whereby the fuel inflow hole of the fuel injection valve is connected to and opened below the fuel flow path of the fuel pipe. .
In addition, an opening of a fuel introduction pipe connected to the fuel pump is connected and opened in the fuel flow path in the gravity direction above the fuel flow path into which the inflow side end of the fuel injection valve is inserted. An open air path that opens to the atmosphere opens in the fuel flow path located above the opening of the fuel introduction pipe in the direction of gravity.
A normally closed on-off valve that opens and closes the atmosphere opening path by manual operation is disposed in the atmosphere opening path.
When the engine is started, if the driver performs a starting operation, the fuel pump is driven in synchronization with the starting operation to increase the fuel pressure in the fuel pipe, the fuel introduction pipe, the fuel pipe, and the fuel pressure. At this time, when the on-off valve is manually operated by the driver and the atmosphere opening path is opened, the fuel that is pressurized by the fuel pump and held in the pipe is discharged from the atmosphere opening path to the atmosphere with pressure. At the same time as the fuel is discharged, the vapor accumulated in the pipe is also discharged out of the pipe.
At this time, since the atmosphere opening path opens at the uppermost position of the fuel flow path of the fuel pipe, the vapor in the pipe can be surely discharged to the outside, thereby improving the running performance immediately after the engine is hot restarted and immediately after the engine is started. .
Japanese Patent Application No. 2003-136720

According to the fuel pipe in such a conventional fuel injection device, when the on-off valve is manually operated and the atmosphere opening path is opened at the start of the engine, the fuel including the vapor is discharged around the fuel pipe and scattered. According to this, the fuel adheres to the equipment around the fuel pipe, and foreign matters are likely to adhere to the fuel, and it is necessary to increase the maintenance degree of the equipment.
In addition, the scattered fuel may adhere to the driver, and is not preferable particularly in a motorcycle. Furthermore, there is a possibility that the fuel adheres to the electric connector portion of the fuel injection valve disposed in the vicinity of the fuel pipe.

  The fuel pipe in the fuel injection device according to the present invention is made in view of the above problems, and when the engine is started, the fuel including the vapor is discharged to the outside by operating the on-off valve. By discharging the fuel to a desired fixed position, the fuel adheres to the surrounding equipment including the fuel injection valve, and the fuel adheres to the driver who operates the on-off valve. Fuel must adhere to the electrical connector of the fuel injection valve. It is a first object to provide a fuel pipe capable of suppressing the above.

In order to achieve the above object, the fuel pipe in the fuel injection device according to the present invention boosts the fuel in the fuel tank with a fuel pump and injects the boosted fuel to the engine via the fuel injection valve. In the injection device,
The fuel pipe fixedly disposed on the fixing member has a fuel flow path formed therein, and the fuel flow path is below the valve seat in the gravity direction by a valve seat formed in the fuel flow path. A fuel inflow chamber having an injection valve support hole for inserting and supporting the inflow side end portion of the fuel injection valve, and a fuel discharge chamber above the valve seat in the gravity direction;
A valve body that closes the valve seat by a first spring is disposed in the fuel inflow chamber, and the fuel discharge chamber is pressed by a second spring toward the closing direction of the valve body, and its lower end is fuel discharge An operating rod arranged opposite to the valve stem of the valve body protruding toward the room is arranged,
In the fuel inflow chamber, an opening portion of a fuel introduction pipe connected to a fuel pump is opened, and an inflow side end portion of the fuel injection valve is inserted and disposed in the injection valve support hole,
On the other hand, a drain hole is opened in the fuel discharge chamber, and the drain hole is opened at a desired position through the atmosphere side opening of the drain pipe.
When starting the engine, by pressing the operating rod against the spring force of the first spring and the second spring, the valve body is operated to open the valve seat,
The first feature is that the fuel pressurized by the fuel pump is discharged from the atmosphere side opening of the drain pipe through the fuel inflow chamber, the valve seat, and the fuel discharge chamber .

  In addition to the first feature, the present invention has a second feature that the atmosphere side opening of the drain pipe is opened in the fuel tank.

  In addition to the first feature, the present invention has a third feature that the atmosphere side opening of the drain pipe is connected to the return fuel passage of the pressure regulator.

The present invention, in addition to the first feature, the operating rod, an electromagnetic coil, a movable iron core, a fourth feature that it has operated by an electromagnetic device D formed by the fixed iron core.

According to the present invention, in addition to the fourth feature, the electromagnetic device is energized while the engine cell motor is driven, and the operating rod is operated via the movable iron core to open the valve body. 5 features.

The present invention, in addition to the first or fourth aspect, in the non-operated state of the operating rod, and the sixth aspect of the formed retaining a gap between the operating rod and the valve body.

Furthermore, the present invention is, in addition to the first feature, in the non-operated state of the operating rod, the pressing portion outer end of the operating rod, that is positioned inwardly from the outer end of the fuel tube 7 Features.

According to the first feature of the present invention, for example, when the engine is hot restarted, the fuel pump is electrically driven and the operating rod is pressed against the spring force of the first spring and the second spring. The valve body is operated to open the valve seat so that the fuel inflow chamber and the fuel discharge chamber communicate with each other.
According to this, the vapor stagnating in the fuel introduction pipe and the fuel inflow chamber flows into the fuel discharge chamber together with the pressurized fuel, and then the fuel containing the vapor is discharged at a desired fixed position through the drain hole and the drain pipe. The
Therefore, the fuel that does not contain vapor can be continuously and stably supplied from the fuel injection valve to the engine, and the engine can be restarted with good heat.
The fuel containing the vapor can be discharged to a desired position away from the fuel pipe by the drain pipe, so that the fuel pipe and the equipment around the fuel pipe do not adhere to the fuel pipe and the surroundings of the fuel pipe. It can be kept clean for a long period of time and can suppress swelling and deterioration of parts such as rubber and resin caused by the adhesion of fuel.
In particular, the absence of fuel adhering to the electrical connector portion of the fuel injection valve attached to the fuel pipe can maintain the stability of electrical connection over a long period of time.
Furthermore by fuel containing vapor is discharged at a position away from the fuel pipe by drainage pipe, the fuel is suppressed from adhering to the driver to operate the on-off valve, as in particular motorcycle, the vicinity of the fuel pipe This is preferable in a case where the driver rides across the vehicle. Furthermore, it can be confirmed that the fuel pump is operating by confirming the discharge of the fuel from the drain pipe.
Further, even if the center of the operating rod in the pressing direction and the center of the valve body in the opening / closing direction are arranged eccentrically, the closing performance of the valve body with respect to the valve seat can always be maintained well.
The spring force of the first spring that presses the valve body toward the valve seat can be selected regardless of the spring force of the second spring that presses the operating rod and can be set to a relatively weak spring force. It is possible to reduce wear on the body valve seat and maintain a stable valve closing property over a long period of time.

According to the second aspect of the present invention, the fuel including the vapor that flows down the drain pipe with the opening / closing valve opened is returned to the fuel tank.
According to this, since fuel is not consumed unnecessarily, deterioration of fuel economy is suppressed and fuel is not evaporated in the atmosphere, which is preferable from the viewpoint of preventing air pollution.

According to the third aspect of the present invention, the fuel containing the vapor flowing down the drain pipe with the opening / closing valve opened flows into the return fuel passage of the pressure regulator, and then returns to the fuel tank.
According to this, when returning the fuel in the drain pipe to the fuel tank, since the return fuel passage of the pressure regulator is used, the length of the drain pipe can be shortened and a new fuel opening for return is provided in the fuel tank. There is no need, and a conventional fuel tank can be used as it is.

Further, according to the fourth feature of the present invention, when the engine is started, the movable iron core is operated by energizing the electromagnetic coil of the electromagnetic device, and the operation lever is moved by the operation of the movable iron core to automatically move the valve seat. It can be opened and the fuel containing vapor can be automatically discharged from the drain pipe.
On the other hand, after the engine is started, the valve seat can be automatically closed again by turning off the power to the electromagnetic coil.
According to the above, especially in a two-wheeled vehicle, the electric switching operation can be performed in a state where the driver gets on the two-wheeled vehicle, and the operability can be greatly improved.

Further, according to the fifth aspect of the present invention, the electromagnetic coil of the electromagnetic device is energized while the cell motor is driven at the start of the engine, the valve seat is automatically opened, and the fuel including the vapor is automatically supplied from the drain pipe. Discharged.
On the other hand, when the driving of the cell motor is stopped, the energization to the electromagnetic coil is cut off and the valve seat is again held closed.
According to the above, since the valve body is operated synchronously with the cell motor, the vapor can be surely discharged every time the engine is started. Further, the driver only needs to perform the driving operation of the cell motor and does not require any special operation of the valve body, so that the operability can be improved.

Further, according to the sixth aspect of the present invention, a gap is formed between the operating rod and the valve body when the operating rod is not operated.
According to this, since the valve body and the operating rod are held in a non-contact state in the non-operating state of the operating rod, the valve body is surely pressed against the valve seat by the first spring, and the valve seat has a good occlusion. Can be held.
Further, even when the operating rod is slightly vibrated during operation of the engine, the operating rod does not press and release the valve body, and the valve seat can be stably held closed. Further, the opposed portion between the operating rod and the valve body does not collide and wear.

Furthermore, according to the seventh feature of the present invention, when the operating rod is not operated, the outer end of the pressing portion of the operating rod is positioned inward from the outer end of the fuel pipe.
According to this, in particular, an occupant riding a motorcycle does not carelessly touch the operating rod and press the operating rod. In addition, during traveling, the operating rod does not come into contact with the extraneous object, and the operating rod does not break or bend, and the operability of the operating rod can be stably maintained for a long time.

An embodiment of a fuel pipe in a fuel injection device according to the present invention will be described below with reference to FIGS.
FIG. 1 is an overall configuration diagram of a fuel injection device in which a fuel pipe of the present invention is attached to an intake pipe,
FIG. 2 is an enlarged longitudinal sectional view of a main part of the fuel pipe.
First, the overall configuration of the fuel injection device will be described.
Reference numeral 10 denotes a throttle body having an intake passage 11 formed therethrough. The intake passage 11 is a butterfly throttle valve 13 attached to a throttle valve shaft 12 rotatably supported by the throttle body 10. Is controlled to open and close.
The upstream side 11 a of the intake passage 11 of the throttle body 10 is connected to the air cleaner A, and the downstream side 11 b is connected to the engine E via the intake pipe 20.
T is a fuel tank in which fuel is stored, and the fuel in the fuel tank T is sucked into the fuel pump P through the fuel suction passage Pa and boosted, and the boosted fuel is supplied to the fuel discharge passage Pb. To the fuel introduction pipe 30.
R is a pressure regulator which is supplied from the fuel pump P and adjusts the fuel pressure flowing in the fuel introduction pipe 30 to a predetermined constant fuel pressure. The pressure regulator R is connected to the fuel introduction pipe 30 and is surplus from the pressure regulator R. A return fuel passage 31 for discharging the fuel is connected to the fuel tank T.

Accordingly, the clean air from which foreign matter has been removed by the air cleaner A flows into the intake passage 11 of the throttle body 10 and the amount thereof is controlled by the throttle valve 13 operated by the driver, and this controlled air is taken into the intake air. It is supplied to the engine E through the pipe 20.
On the other hand, the fuel in the fuel tank T is boosted by the fuel pump P and supplied into the fuel introduction pipe 30, while the fuel flowing in the fuel introduction pipe 30 is regulated to a predetermined constant fuel pressure by the pressure regulator R, Excess fuel in the pressure regulator R is returned into the fuel tank T via the return passage 31.

The fuel pipe 1 penetrates in the vertical direction and has a fuel flow path 2 formed therein. The fuel flow path 2 is opened downward with an injection valve support hole 2a. The operating rod guide plug 3 having the guide hole 3a is screwed.
The upper outer end 1 a of the fuel pipe 1 is formed by the upper end 3 b of the operating rod guide plug 3.
In addition, a valve seat 4 is formed at a substantially middle portion of the fuel flow path 2, and the valve seat 4 divides the fuel flow path 2 into a fuel discharge chamber 5 directed upward and a fuel inflow chamber 6 directed downward. .
The injection valve support hole 2 a opens into the fuel inflow chamber 6.
Reference numeral 7 denotes a valve body disposed opposite to the valve seat, and the valve body 7 is pressed against the valve seat 4 by the first spring S <b> 1 to close the valve seat 4.
The valve body 7 includes a valve rod 7a disposed in the fuel inflow chamber 6 so as to face the valve seat 4 and projecting upward from the valve body 7 into the fuel discharge chamber 5, and the first spring S1. The lower end S1a is locked to a locking step 4a formed inward of the valve seat 4, and the upper end S1b is locked to the flange 7b of the valve rod 7a.

Reference numeral 8 denotes an operating rod disposed in the fuel discharge chamber 5. A shaft portion 8 a of the operating rod 8 is supported by the guide hole 3 a of the operating rod guide plug 3 so as to be axially movable, and a lower end 8 b of the operating rod 8 is a valve. Opposing to the upper end of the rod 7a.
The operating rod 8 is pressed toward the valve closing direction (upward in the drawing) by the second spring S2, and the lower end S2a of the second spring S2 is locked to the locking step 5a of the fuel discharge chamber 5, and the upper end S2b is locked to the lower surface of the locking step 8c of the operating rod 8.
According to the above, the operating rod 8 is pressed toward the valve closing direction (upward in the drawing) by the second spring S2, and the upward movement of the operating rod 8 is caused by the upper surface of the locking step portion 8c of the operating rod 8 being Positioning is regulated by coming into contact with the locking step 3c.
The upper stop position of the operating rod 8 is a non-operating state in which no external force is applied to the operating rod 8. In this state, the pressing portion outer end 8d of the operating rod 8 (in other words, the upper end of the operating rod 8 in the figure). ) Is located inward from the outer end 1 a of the fuel pipe 1. (In other words, the upper end of the operation rod 8 is disposed below the upper end 3b of the operation rod guide plug 3)
When the operating rod 8 is not operated, the lower end 8b of the operating rod 8 and the upper end of the valve rod 7a of the valve body 7 are arranged to face each other, and a gap c is formed between the opposed portions. Is done.

Reference numeral 9 denotes a seal member such as a lip seal disposed between the inner diameter portion of the operating rod guide plug 3 and the outer peripheral portion of the shaft portion 8a of the operating rod 8, and L denotes the outer periphery of the operating rod guide plug 3 and the fuel discharge. An O-ring for sealing disposed between the chamber 5.
According to the above, the fuel in the fuel discharge chamber 5 does not leak to the outside through the guide 3 a of the operation rod guide plug 3, and the fuel in the fuel discharge chamber 5 passes through the outer periphery of the operation rod guide plug 3 to the outside. There is no leakage.

  A drain hole 10 is opened in the fuel discharge chamber 5, and an opening 30 a of the fuel introduction pipe 30 is opened in the fuel inflow chamber 6.

The fuel pipe 1 described above can be simply summarized as follows.
The fuel pipe 1 is formed with a fuel flow path 2 in the vertical direction, a valve seat 4 is formed in the middle thereof, and the fuel flow path 2 is divided into a fuel inflow chamber 6 below the gravitational direction by the valve seat 4, A fuel discharge chamber 5 is sectioned above it.
Further, the valve body 7 is disposed facing the valve seat 4, and the valve body 7 is pressed and supported toward the valve seat 4 by the first spring S1. An operating rod 8 is disposed in the fuel discharge chamber 5. A lower end 8b of the operating rod 8 is arranged facing the upper end of the valve rod 7a, and a pressing portion outer end 8d of the operating rod 8 is arranged to open outward facing the outer end 1a of the fuel pipe 1, and further the operating rod 8 Is biased toward the valve closing direction by the second spring S2.
In addition, an injection valve support hole 2a opens downward at the lower end of the fuel inflow chamber 6 and an opening 30a of the fuel introduction pipe 30 opens.
Further, a drain hole 10 is opened in the fuel discharge chamber 5.

The fuel pipe is fixed to the intake pipe 20 and fuel piping is performed as follows.
The inflow side end portion Ja of the fuel injection valve J is inserted into the injection valve support hole 2 a of the fuel pipe 1, and according to this, the fuel inflow hole opened to the inflow side end portion Ja is in the direction of gravity in the fuel inflow hole 6. An opening is disposed below the.
Next, a flat mounting plate 32 is mounted in a groove 1b on the outer periphery of the fuel pipe 1 into which the fuel injection valve J is inserted, and a tip end portion Jb of the fuel injection valve J is formed in a guide hole 20a that allows the intake pipe 20 to be drilled. In this state, the mounting plate 32 is disposed on the fixing member 20b formed so as to protrude from the outer periphery of the intake pipe 20, and is screwed and fixed to the fixing member 20b by a fastening member 33 such as a screw.

According to the above, the fuel pipe 1 is fixed on the intake pipe 20 via the mounting plate 32, and the fuel injection valve J is held between the fuel pipe 1 and the intake pipe 20.
On the other hand, the fuel discharge path Pb of the fuel pump P is connected to the fuel inflow chamber 6 of the fuel pipe 1 through the opening 30 a of the fuel introduction pipe 30, and the drain pipe 34 is connected to the drain hole 10 of the fuel pipe 1. Then, the opening 34a on the atmosphere side of the drain pipe 34 is opened to a suitable place.

Next, the operation will be described.
When starting the engine in a state in which the fuel in the fuel introduction pipe 30 and the fuel pipe 1 is greatly heated, for example, during a hot restart, the driver first performs a starting operation. The electric circuit such as the pump P and the spark plug is energized, the fuel pump P is driven and sucks the fuel in the fuel tank T to increase the pressure, and the boosted fuel is supplied to the fuel introduction pipe 30 and the fuel pipe 1. The fuel is supplied into the fuel inflow chamber 6 to increase the fuel pressure in the fuel pipe.
In this state, the driver presses the operating rod 8 downward against the spring force of the second spring S2, presses the valve body 7 downward against the spring force of the first spring S1, and the valve seat. Hold 4 open. The valve seat open state of the valve body 7 is shown in FIG.
According to the opening of the valve seat 4, the fuel pressurized and held in the fuel inlet pipe 30 and the fuel inflow chamber 6 of the fuel pipe 1 is immediately held in the valve seat 4, the fuel discharge chamber 5, the drain hole 10, the drain. Vapor having a lighter specific gravity than the fuel is discharged to the outside through the opening 30a of the drain pipe 30 together with the fuel flow, and is discharged to the outside through the pipe 34 and the opening 34a. 15. The vapor in the fuel inflow chamber 6 can be extracted.
Therefore, when the driver starts the engine again, the pressure is increased by the fuel pump P, and only the desired fuel without the vapor is continuously injected into the intake pipe 20 from the fuel injection valve J, thus reliably. The engine can be hot restarted.
Further, since the vapor is positively discharged to the outside after the engine is started, accurate fuel can be continuously supplied to the engine, so that stable running performance immediately after the start can be obtained.

Further, in the state where the engine is left for a long period of time (not to use the engine for a long period of time), the starting operation is performed in the same manner as during a hot restart.
According to the above, the fuel deteriorated by leaving for a long time is discharged to the outside from the opening 34a of the drain pipe 34, and new fuel can be supplied to the engine E from the fuel injection valve J. The engine can be reliably started even later.

Here, the characteristic of the fuel pipe 1 of the present invention is that the fuel flow path 2 in the fuel pipe 1 is separately formed in a fuel discharge chamber 5 sealed by a valve seat 4, and a drain hole 10 is formed in the fuel discharge chamber 5. That is, the drain pipe 34 is connected to the drain hole 10 and the opening 34a of the drain pipe 34 is opened at a desired position.
According to this, when the valve body 7 is opened by operating the operating rod 8 and the valve seat 4 is opened, the fuel including the vapor in the fuel introduction pipe 30 and the fuel inflow chamber 6 is passed through the opening of the drain pipe 34. It is possible to discharge to an appropriate place away from the operation tube 1 via 34a and there is no leakage of fuel from the periphery of the operation rod 8, and the fuel scatters around the fuel tube 1, It is possible to eliminate the contamination of the fuel pipe 1 and its surroundings, and it is possible to prevent the fuel from adhering to the parts such as rubber and resin that are arranged around the fuel pipe 1 and swelling and deterioration.
In addition, since the fuel does not scatter toward the electric connector portion of the fuel injection valve J disposed close to the fuel pipe 1, the electric connection portion can be well maintained for a long period of time.
Further, the fuel discharge chamber 5 is formed to be sealed, and the fuel traveling outward from the fuel discharge chamber 5 is discharged only to a position away from the drain pipe 34, so that the fuel adheres to the driver who operates the operating rod. This is particularly preferable for motorcycles.
Furthermore, it is possible to confirm that the fuel pump P is operating normally by performing the starting operation of the engine and opening the valve seat and confirming that the fuel flows out from the drain pipe 34. Driving confirmation can be performed very easily.

  Further, by opening the opening 34a of the drain pipe 34 into the fuel tank T, the fuel discharged from the drain pipe 34 can be returned to the fuel tank T again, so that all the fuel is scattered around. Therefore, the fuel can be used effectively, and further, it is possible to prevent the atmosphere from being polluted by the evaporation of the fuel.

Further, when the opening 34a of the drain pipe 34 is opened in the return fuel passage 31 of the pressure regulator R, there is no need to provide a new fuel opening in the fuel tank T, and the conventional fuel tank T is used as it is. it can.
Furthermore, the length of the drain pipe 34 can be shortened corresponding to the length of the return fuel passage 31, and the piping layout of the drain pipe 34 can be improved.

According to the present invention, the normally-closed on-off valve that opens and closes the valve seat 4 is separately formed by the valve body 7 that faces the valve seat 4 and the operating rod 8 that applies an opening force to the valve body 7. Even if the pressing center of the valve body 7 and the pressing center of the operating rod 8 are misaligned. The obstruction | occlusion property with respect to the valve seat 4 of the valve body 7 can always be maintained favorable. Even if the operation rod 8 is inclined, for example, the valve body 7 is not adversely affected.
Further, according to the arrangement, the first spring S1 for urging the valve body 7 toward the valve seat 4 and the second spring S2 for urging the operating rod 8 toward the valve seat closing direction are arranged separately. The spring force of the first spring S1 is only required to have only the spring force necessary for the valve body 7 to close the valve seat 4, and the valve body 7 can be pressed against the valve seat 4 with an appropriate spring force. Wear of the valve body 7 and the valve seat 4 can be reduced.
In addition, by providing the operation member 8 with the seal member 9, the fuel discharge chamber 5 can be kept airtight.

Further, when the operating rod 8 is not operated, a gap c is formed between the lower end 8b of the operating rod 8 and the upper end of the valve rod 7a of the valve body 7. Even when the dimensional accuracy is poor, the operating rod 8 does not contact the valve body 7 and the valve body 7 does not open the valve seat 4 carelessly.
Further, even when the operating rod 8 slightly vibrates in the longitudinal direction during operation of the engine, the operating rod 8 abuts on the valve body 4 to repeatedly open and close to generate a hitting sound or contact with the valve body 4. Parts will not wear out.

Further, the outer end 8d of the pressing portion of the operating rod 8 is disposed inward from the upper end 3b of the operating rod guide plug 3 (in other words, the outer end 8d of the pressing portion of the operating rod 8 is located inside the outer end of the fuel pipe 1). According to this arrangement, the driver does not carelessly touch the operating rod 8 and press the operating rod 8.
Further, the operating rod 8 can be well protected without being bent or damaged by contacting the other member during traveling.
These are particularly effective in a two-wheeled vehicle in which the fuel pipe 1 is disposed directly exposed to the atmosphere.

Next, another embodiment of the fuel pipe of the present invention will be described with reference to FIG.
About the same structure part as FIG. 2, description is abbreviate | omitted using the same code | symbol.
D is an electromagnetic device for electrically operating the operating rod 8 and is formed as follows.
Reference numeral 40 denotes a coil bobbin having a cylindrical portion 40a at the center, a lower flange portion 40b extending laterally below the cylindrical portion 40a, and an upper flange portion 40c extending laterally above it.
The coil bobbin 40 is formed of a synthetic resin material that is an insulating material, and an electromagnetic coil 40d is wound around the outer periphery of the cylindrical portion 40a.
Reference numeral 41 denotes a lower magnetic pole formed by a lower magnetic pole piece 41a disposed in the lower flange portion 40b of the coil bobbin 40 and a fixed iron core 41b inserted and disposed in the cylindrical portion 40a, and is formed of a magnetic material. .
The lower magnetic pole 41 is formed with an insertion hole 41c extending vertically from the upper surface of the fixed iron core 41b to the lower surface of the lower magnetic pole piece 41a.
Reference numeral 42 denotes an upper magnetic pole piece disposed on the upper flange portion 40c of the coil bobbin 40. On the other hand, a movable iron core 43 is movably disposed in the cylindrical portion 40a of the coil bobbin 40 so as to face the fixed iron core 41b. The movable iron core 43 is made of a magnetic material. Reference numeral 44 denotes a housing which is arranged so as to surround the outer periphery of the electromagnetic coil 40d and is made of a magnetic material. The housing 44 magnetically couples the lower magnetic pole piece 41a and the upper magnetic pole piece 42, and the electromagnetic coil 40d. Is energized, the upper magnetic pole piece 42, the movable iron core 43, the fixed iron core 41b, the lower magnetic pole piece 41a, and the housing 44 form a magnetic circuit.
In this embodiment, the lower end of the housing 44 is caulked and coupled to the flange 3d of the operating rod guide plug 3, and the upper end is caulked and coupled to the non-magnetic member 45 disposed on the upper magnetic pole piece 42. .

According to the above, the electromagnetic device D is attached to the upper portion of the fuel pipe 1 by screwing the operating rod guide plug 3 into the upper opening 2 b of the fuel flow path 2 of the fuel pipe 1.
When the electromagnetic device D is attached to the fuel pipe 1, the small-diameter shaft portion 8e protruding further upward from the shaft portion 8a of the operating rod 8 penetrates the lower magnetic pole piece 41a and the fixed iron core 41b. The upper end of the insertion hole 41 c is disposed in contact with the lower end surface 43 a of the movable iron core 43.
The operation rod 8 is urged upward in this way due to the spring force of the second spring S2.

Next, the operation will be described.
Since the magnetic coil 40d does not form any magnetic circuit when the electromagnetic coil 40d is de-energized, the movable iron core 43 is moved to the upper position by the operating rod 8 pressed upward by the spring force of the second spring S2. Pressed.
This state is shown in FIG. 4, and a gap c is formed between the lower end 8b of the operating rod 8 and the valve rod 7a of the valve body 7, and the lower end 43a of the movable iron core 43 and the upper end 41d of the fixed iron core 41b A gap d is also formed between them.
Therefore, the valve body 7 closes and holds the valve seat 4 by the spring force of the first spring S1.

Next, when the engine is hot restarted or when the engine is started after being left for a long period of time, the electromagnetic coil 40d is energized together with the engine starting operation.
According to this, the electromagnetic coil 40d forms a magnetic circuit between the upper magnetic pole piece 42, the movable iron core 43, the fixed iron core 41b, the lower magnetic pole piece 41a, and the housing 44, and the movable iron core 43 is formed by the magnetic force generated thereby. It attracts and moves toward the fixed iron core 41b (downward in FIG. 4) against the spring force of the first spring S1 and the second spring S2.
According to the movement of the movable iron core 43, the operating rod 8 and the valve body 7 are also moved downward in synchronism with this, and the valve body 7 holds the valve seat 4 open. 30 and the vapor accumulated in the fuel inflow chamber 6 are discharged together with the fuel through the drain hole 10 and the drain pipe 34, so that the engine can be started well.

According to the second embodiment, at the time of starting the engine, the driver only has to energize the electromagnetic coil 40d of the electromagnetic device D, so that the operation rod 8 is mechanically pressed. The operability with respect to the operation rod 8 can be greatly improved.
Particularly in the case of a two-wheeled vehicle, the energization operation can be performed while the driver is in the two-wheeled vehicle.
In addition, the energization time may be performed in a short time in the initial stage of starting the engine, so that the battery power is not consumed greatly, and the battery capacity is relatively small compared to a four-wheeled vehicle. It is suitable for small motorcycles.

Further, by energizing the electromagnetic coil 40d of the electromagnetic device in synchronism with the cell motor while the cell motor is driven at the time of starting the engine, it is possible to discharge the vapor that always stays at the time of starting the engine. Thus, the startability can be further improved.
Further, if the electromagnetic coil 40d is connected in series to the electric circuit of the cell motor, the electric switch for energizing the electromagnetic coil and the operation of the electric switch can be eliminated.
When the initial and complete explosions of the engine are completed and the driving of the cell motor is released, the electromagnetic coil 40d is automatically turned off.

FIG. 5 shows still another embodiment of the fuel pipe of the present invention.
Explaining only the difference, the fuel pipe 50 includes a first fuel channel 51a formed in the vertical direction, and a second fuel channel 51b formed from the upper end of the first fuel channel 51a toward the left side. The valve seat 4 is formed in the second fuel flow path 51b, and is thereby divided into a fuel inflow chamber 6 and a fuel discharge chamber 5.
An inflow side end of the fuel injection valve J is inserted and supported in an injection valve support hole that opens below the fuel inflow chamber 6, and a fuel introduction pipe 30 is connected to the upper side of the fuel inflow chamber 6 to open.
On the other hand, a drain hole 10 is opened downward in the fuel discharge chamber 5 formed toward the left side, and a drain pipe 34 is connected to the drain hole 10, and an atmosphere side opening 34 a of the drain pipe 34 is desired. Open at a certain position.
Since the valve body and the operating rod are the same as those in the first embodiment, the same reference numerals are used.

  According to such a fuel pipe, since the fuel discharge chamber 5 and the fuel introduction pipe 30 are disposed on the sides, the height of the fuel injection valve J in the longitudinal axis direction XX can be shortened. In the case where the intake pipe is disposed at the lower position of the fuel tank, the degree of freedom in arrangement can be increased.

1 is an overall configuration diagram of a fuel injection device equipped with a fuel pipe according to the present invention. It is a principal part expanded longitudinal cross-sectional view of the fuel pipe of this invention, and shows a valve-seat closed state. The valve seat open state of the fuel pipe | tube of FIG. 2 is shown. It is a principal part expanded longitudinal cross-sectional view which shows the other Example of the fuel pipe | tube of this invention. It is a principal part expanded longitudinal cross-sectional view which shows another Example of the fuel pipe | tube of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel pipe 1a Outer end 2 of fuel pipe Fuel flow path 2a Injection valve support hole 4 Valve seat 5 Fuel discharge chamber 6 Fuel inflow chamber 7 Valve element 10 Drain hole 34 Drain pipe 34a Drain pipe opening on the atmosphere side

Claims (7)

In a fuel injection device that pressurizes fuel in a fuel tank with a fuel pump and supplies the boosted fuel to an engine via a fuel injection valve.
The fuel pipe (1) fixedly arranged on the fixing member (20b) has a fuel flow path (2) formed therein and the fuel flow path is a valve seat formed in the fuel flow path (2). According to (4), the fuel inflow chamber (6) is provided with an injection valve support hole (2a) that is below the valve seat (4) in the direction of gravity and inserts and supports the inflow side end (Jb) of the fuel injection valve (J). ) And the fuel discharge chamber (5) above the valve seat (4) in the direction of gravity,
A valve body (7) for closing the valve seat (4) by the first spring (S1) is disposed in the fuel inflow chamber, and the valve body (7) is closed in the fuel discharge chamber (5). An operating rod (8) that is pressed by the second spring (S2) in the direction side and whose lower end (8b) is opposed to the valve stem (7a) of the valve body protruding into the fuel discharge chamber (5). Is placed,
An opening (30a) of a fuel introduction pipe (30) connected to the fuel pump (P) is opened in the fuel inflow chamber, and an inflow side end (of the fuel injection valve (J) is inserted into the injection valve support hole (2a). Jb) is inserted and arranged,
On the other hand, a drain hole (10) is opened in the fuel discharge chamber, and the drain hole is opened at a desired position through the atmosphere side opening (34a) of the drain pipe (34).
When the engine is started, the operating rod (8) is pressed against the spring force of the first spring (S1) and the second spring (S2), thereby operating the valve body (7) and the valve seat ( 4)
The fuel pressurized by the fuel pump (P) is discharged from the atmosphere side opening (34a) of the drain pipe (34) through the fuel inflow chamber (6), the valve seat (4), and the fuel discharge chamber (5). fuel pipe in the fuel injection apparatus characterized by the.   The fuel pipe in the fuel injection device according to claim 1, wherein an opening (34a) on the atmosphere side of the drain pipe is opened in the fuel tank (T).   The fuel pipe in a fuel injection device according to claim 1, wherein the opening (34a) on the atmosphere side of the drain pipe is connected to the return fuel passage (31) of the pressure regulator (R). The operating rod, an electromagnetic coil (40d), the movable iron core (43), the fuel in the fuel injection device according to claim 1, characterized in that it has operated by an electromagnetic device which is formed by the fixed iron core and (41b) (D) tube. The electromagnetic device is energized while the cell motor of the engine is being driven, and the valve element (7) is opened by operating the operating rod (8) through the movable iron core (43). A fuel pipe in the fuel injection device according to claim 4 . The fuel pipe in the fuel injection device according to claim 1 or 4 , wherein a gap (C) is formed and held between the operating rod (8) and the valve body (7) when the operating rod is not operated. . In non-operated state of the operating rod, claim, characterized in that the pressing portion outer end of the operating rod (8) to (8d), was positioned inward than the outer end (1a) of the fuel pipe (1) 1 A fuel pipe in the fuel injection device described.

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