JP5563224B2 - Fuel injection pump - Google Patents

Description

  The present invention relates to a technology of a fuel injection pump mounted on a diesel engine. In detail, it is related with the fuel-injection pump provided with the electromagnetic spill valve.

  Conventionally, in order to improve the combustion efficiency of a diesel engine and reduce exhaust gas emissions in a fuel injection pump, the fuel injection pressure is increased, or multiple fuel injections are performed according to the state of the engine during one combustion cycle. And changing the injection amount to further improve the combustion efficiency.

  Therefore, a fuel injection pump having an electromagnetic spill valve is used as one of fuel injection pumps for diesel engines. By supplying a predetermined amount of fuel into the fuel injection nozzle at a predetermined timing according to the operating state of the engine by opening and closing a spill valve in the fuel injection pump with fuel pressurized to a high pressure by a cam linked with the engine Precise combustion control is performed.

  However, pulsation of fuel pressure is generated in a high-pressure pipe that supplies high-pressure fuel from a fuel injection pump to a fuel injection nozzle by injecting high-pressure fuel with an electromagnetic spill valve at high speed. At this time, if the discharge valve of the fuel injection pump is closed, the pulsation of the fuel pressure is not attenuated, and the needle valve of the fuel injection nozzle may be opened again due to an unintended increase in the fuel pressure, causing secondary injection. In addition, there has been a problem that cavitation occurs due to an unintended sudden drop in fuel pressure, or combustion gas flows backward from the combustion chamber. Therefore, a technology of a fuel injection pump having an isobaric valve that opens when the fuel pressure in the high-pressure pipe is equal to or higher than a predetermined pressure after the discharge valve is closed is known. For example, as in Patent Document 1.

  However, in the configuration disclosed in the above-described patent document, the pressure pulsation in the high-pressure pipe can be suppressed by the action of the isobaric valve, but an intersection is formed in the discharge path of the fuel released from the electromagnetic spill valve. (See FIG. 4 (a) and FIG. 4 (b)), secondary injection or the like caused by pressure pulsation caused by the reflected fuel being reflected at the intersection in the discharge path cannot be reduced. There was a problem.

Japanese Patent No. 2841510

  The present invention has been made in view of the above-described problems, and fuel injection that reduces the occurrence of pressure pulsation in the discharge passage and suppresses secondary injection and the like even when the electromagnetic spill valve is controlled at complicated timing. The purpose is to provide a pump.

According to the first aspect of the present invention, the fuel pressure is increased and released by driving the pump main body, the barrel built in the pump main body to form the pressurizing chamber, and the spill valve body fixed to the barrel with a solenoid. In a fuel injection pump comprising an electromagnetic spill valve for controlling the pressure, the spill valve is disposed on one side of a spill valve hole in which a spill valve body is slidably mounted in an electromagnetic spill valve body constituting the electromagnetic spill valve. An enlarged diameter portion having an inner diameter larger than the outer diameter of the body is formed, a guide member is fitted into the enlarged diameter portion of the spill valve hole, and the spill valve body is slidably mounted in the guide member. The electromagnetic spill valve body is formed with a spill valve chamber surrounded by the guide member and the spill valve body, and the electromagnetic spill valve body is formed with two second spill oil discharge passages including oblique holes. Formed in the spill valve chamber and barrel An electromagnetic spill of the first spill oil discharge passage formed in the barrel by linearly connecting the two first spill oil discharge passages by the two second spill oil discharge passages including the oblique holes. A first stepped portion is formed at the valve side end portion, a second stepped portion is formed at the barrel side end portion of the second spill oil discharge passage formed in the spill valve body, and the first step A hollow cylindrical positioning member is fitted to the attachment portion and the second stepped portion, and the positioning member is formed in a hollow cylindrical shape, and the second spill oil discharge passage and the first spill oil discharge passage through the hollow portion. Is configured to communicate with each other.

According to a second aspect of the present invention, in the fuel injection pump according to the first aspect of the present invention, a seal member is disposed on the outer peripheral portion of the positioning member.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, since the boring process for forming the spill valve chamber can be abolished, the size of the inner diameter of the second spill oil discharge passage can be determined without being restricted by the boring process. At the same time, the second spill oil discharge passage has no branching portion. Thereby, even if the electromagnetic spill valve is controlled at a complicated timing, the occurrence of pressure pulsation in the discharge path can be reduced, and secondary injection or the like can be suppressed.

In addition , since the discharge path is constituted by the two second spill oil discharge paths and the two first spill oil discharge paths, the pressure pulsation in the discharge path can be controlled even if the electromagnetic spill valve is controlled at a complicated timing. It is possible to reduce the occurrence of secondary injection and the like.

In addition , the position of the electromagnetic spill valve and the barrel is fixed via the positioning member, so that the first spill oil discharge path and the second spill oil discharge path can be fixed without being displaced, and separately for the positioning pin. No processing is required. Thereby, even if the electromagnetic spill valve is controlled at a complicated timing, the occurrence of pressure pulsation in the discharge path can be reduced, and secondary injection or the like can be suppressed.

Since it comprised like Claim 2 , the oil leak from the communication part of a 1st spill oil discharge path and a 2nd spill oil discharge path can be prevented with a cheap and simple structure. Thereby, even if the electromagnetic spill valve is controlled at a complicated timing, the occurrence of pressure pulsation in the discharge path can be reduced, and secondary injection or the like can be suppressed.

Sectional drawing which shows the fuel-injection pump which concerns on 1st embodiment. AA sectional drawing in FIG. Sectional drawing which shows the fuel-injection pump which concerns on 2nd embodiment. (A) The expanded sectional view which shows the conventional fuel injection pump. (B) BB sectional drawing in Fig.4 (a) which shows the conventional fuel injection pump.

  The fuel injection pump 1 according to the first embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the fuel injection pump 1 is connected to a low-pressure pump (feed pump) (not shown). The fuel from the low-pressure pump is pressurized by the fuel injection pump 1 and supplied to a fuel injection nozzle (not shown). It is injected into the combustion chamber. The fuel injection pump 1 mainly includes a pump body 10, an electromagnetic spill valve 20, and an equal pressure valve 30.

  The pump body 10 is a main structure constituting the fuel injection pump 1. The pump main body 10 mainly includes a pump main body 11, a barrel 12, a plunger 13, a plunger spring 14, a tappet 15, a cam (not shown), and the like.

  The pump body 11 is a main structure constituting the pump body 10. The pump main body 11 is formed in a substantially cylindrical shape, and a plunger spring chamber 11a in which a plunger spring 14 and a tappet 15 are housed on one side of the shaft center (on the side opposite to the discharge port 32a, the lower side in FIG. 1) And a barrel holding hole 11b for holding the barrel 12 on the other side of the axial center (on the discharge port 32a side) is formed to communicate with the plunger spring chamber 11a and to open the other end. The pump body 11 has a fuel supply port 11c and is connected to a low-pressure pump (not shown).

  The barrel 12 includes a plunger 13 that is slidable. The barrel 12 has a substantially cylindrical shape and is formed with an outer diameter that allows one side (the side opposite to the discharge port 32a, the lower side in FIG. 1) to be inserted into the barrel holding hole 11b without any gap, and at the other end (the side of the discharge port 32a). Has a flange. The barrel 12 is inserted into the barrel holding hole 11b and fixed to the other end of the pump body 11 with a bolt or the like via a flange. Further, the barrel 12 has a plunger hole 12a in which a plunger 13 is housed in an axial center portion formed by opening one end, and the other end face and the plunger hole 12a are communicated with each other through a fuel supply passage 12b. The end face communicates with the fuel supply port 11c through the first spill oil discharge passage 12c.

  The plunger 13 pressurizes the fuel. The plunger 13 has a substantially cylindrical shape, can be inserted into the plunger hole 12a without any gap, and has an outer diameter that is slidable. The plunger 13 has a plunger spring 14 hooked at one end (on the side opposite to the discharge port 32a, the lower side in FIG. 1), and a pressure chamber 18 is formed by the other end (discharge port 32a side) and the plunger hole 12a. To do.

  The plunger spring 14 is a compression spring that urges the plunger 13 to one side (the counter discharge port 32a side, the lower side in FIG. 1). One end of the plunger spring 14 is hooked to the plunger 13 via the plunger spring receiver 14a, and the other end is hooked to the pump body 11 via the plunger spring receiver 14b. The plunger spring 14 is configured to be biased to one side even at a position where the plunger 13 has moved to the most side.

  The tappet 15 transmits an urging force from a cam (not shown) to the plunger 13. The tappet 15 has a substantially cylindrical shape with one end (on the opposite side of the discharge port 32a, the lower side in FIG. 1) closed, can be inserted into the plunger spring chamber 11a without any gap, and has an outer diameter that is slidable. A plunger spring 14 is attached to the plunger 13. Further, the tappet 15 has a roller 15a rotatably supported at one end portion, and abuts against a cam (not shown) via the plunger 13 and the roller 15a by the biasing force of the plunger spring 14. A cam (not shown) is rotated by power from a crankshaft of a diesel engine (not shown), and reciprocates the plunger 13 via a roller 15a that is in contact with the cam (not shown).

  The electromagnetic spill valve 20 controls the fuel injection of the fuel injection pump 1. The electromagnetic spill valve 20 mainly includes an electromagnetic spill valve main body 21, a spill valve body 22, a solenoid 23, a guide member 24, and the like.

  The electromagnetic spill valve body 21 is a main structure constituting the electromagnetic spill valve 20. The electromagnetic spill valve body 21 is formed in a substantially rectangular parallelepiped. In the electromagnetic spill valve main body 21, the center position of the end surface on one side (the counter discharge port 32a side, the lower side in FIG. 1) and the center position of the end surface on the other side (discharge port 32a side) are communicated with each other through the fuel supply path 21a. The electromagnetic spill valve body 21 is formed so that the spill valve hole 21b intersects the fuel supply passage 21a perpendicularly (in the horizontal direction in FIG. 1). The electromagnetic spill valve main body 21 is formed with a constant pressure valve spring chamber 21e at a position centering on the fuel supply passage 21a on the other end face. The electromagnetic spill valve main body 21 is fixed by a bolt or the like with the one side end face and the other end face of the barrel 12 in close contact with each other. The fuel supply passage 21a communicates with the fuel supply port 11c through a spill valve hole 21b, a spill valve chamber 21c, a second spill oil discharge passage 21d, and a first spill oil discharge passage 12c.

  The spill valve chamber 21c is a part of a passage that passes when the fuel is released. The spill valve chamber 21c is fitted to a spill valve body 22 while one side of the spill valve hole 21b is formed to have an inner diameter larger than the outer diameter of the spill valve body 22, and to one end of the larger diameter section. Is surrounded by a guide member 24 and a spill valve body 22 that are slidably mounted.

  As shown in FIGS. 1 and 2, the second spill oil discharge passage 21d is a part of a passage through which the fuel passes when the pressure is released. Two second spill oil discharge passages 21d are formed as shown in FIG. 2, and the spill valve chamber 21c communicates linearly with the two first spill oil discharge passages 12c. Yes.

  As shown in FIG. 1, the spill valve body 22 controls the timing of pressurizing and releasing the pressure of the fuel supply passage 21 a. The spill valve body 22 is substantially cylindrical and can be inserted into the spill valve hole 21b without any gap, and is formed to have an outer diameter that is slidable. The spill valve body 22 is housed in the electromagnetic spill valve body 21. The spill valve body 22 is fixedly provided with an armature 22a made of a magnetic material at one end, and is urged to the other side by a spill valve spring 22b. The spill valve body 22 maintains the fuel pressure in the fuel supply path 21a when moving to one side, and the fuel supply path 21a includes two spill valve chambers 21c when moving to the other side. The second spill oil discharge passage 21d and the two first spill oil discharge passages 12c communicate with the fuel supply port 11c to release the fuel pressure in the fuel supply passage 21a. Is formed smaller than the spill valve hole 21b.

  The solenoid 23 generates magnetic force. The solenoid 23 is fixed so that the suction surface faces the end surface of the electromagnetic spill valve body 21 in which the spill valve hole 21b is formed. The solenoid 23 is configured to generate a magnetic force by acquiring a signal from a control device (not shown).

  The equal pressure valve unit 30 maintains the fuel pressure after completion of fuel discharge and injection at a predetermined value. The equal pressure valve unit 30 includes an equal pressure valve main body 32, a discharge valve 33, an equal pressure valve 34, and the like. The isobaric valve portion 30 is connected to a high pressure pipe joint 35.

  The equal pressure valve body 32 is a main structure constituting the equal pressure valve portion 30. The isobaric valve body 32 is formed so that one end (on the side opposite to the discharge port 32a) of the end face is substantially the same as the other end face of the electromagnetic spill valve body 21, and an internal thread portion for fastening the high-pressure pipe joint 35 to the center position on the other side. 32b is formed. The equal pressure valve main body 32 has a discharge valve spring chamber 32c having an inner diameter larger than the inner diameter of the equal pressure valve spring chamber 21e at a position overlapping the equal pressure valve spring chamber 21e on one side end surface, and a female screw portion 32b and a discharge valve spring chamber. 32c communicates with the discharge port 32a. The isobaric valve main body 32 is fixed by a bolt or the like with the one side end face and the other side end face of the electromagnetic spill valve main body 21 being in close contact with each other.

  The discharge valve 33 discharges fuel from the discharge port 32a. The discharge valve 33 includes a discharge valve body 33a and a discharge valve spring 33b. The discharge valve body 33a is substantially cylindrical and has an outer diameter that allows a high-pressure fuel to pass through between the discharge valve spring chamber 32c and the discharge valve body 33a. The discharge valve body 33a is built in the discharge valve spring chamber 32c. . The discharge valve body 33a has one end (on the side opposite to the discharge port 32a) seated on the other end surface of the electromagnetic spill valve body 21 and the other end surface on one side by a discharge valve spring 33b housed in the discharge valve spring chamber 32c. Is biased in the direction. Further, the discharge valve body 33a is formed with an equal pressure valve chamber 33c at the center position of one side end face, and the other end face communicates with the equal pressure valve chamber 33c through an equal pressure valve passage 33d.

  The equal pressure valve 34 opens and closes the equal pressure valve passage 33d. The equal pressure valve 34 includes an equal pressure valve body 34a and an equal pressure valve spring 34b. The isobaric valve body 34a is composed of a ball and a receiving member, and the receiving member is substantially cylindrical and has an outer diameter so that a gap through which fuel can pass is formed between the isobaric valve chamber 33c and the isobaric valve body 34a. And is installed in the isobaric valve chamber 33c. The isobaric valve body 34a seats the ball on the other side (discharge port 32a side) of the isobaric valve chamber 33c, and has an end surface on one side (the anti-discharge port 32a side, the lower side in FIG. 1) through the receiving member. It is urged | biased to the other side (discharge port 32a side) by the equal pressure valve spring 34b built in 21e.

  The high pressure pipe joint 35 supplies high pressure fuel to a fuel injection nozzle (not shown). The high-pressure pipe joint 35 is formed with a cylindrical male screw portion 35a on one side of the pipe-like member (on the discharge port 32a side). In the high-pressure pipe joint 35, the center position of the male screw part 35 a and the other side (counter discharge port 32 a side) end part are communicated with each other through a fuel supply path 35 b. The high-pressure pipe joint 35 is brought into close contact with the end surface of the male screw portion 35a and the other end surface of the constant pressure valve main body 32, and the male screw portion 35a is detachably screwed to the female screw portion 32b of the constant pressure valve main body 32.

  With such a configuration, when the fuel injection pump 1 discharges fuel, the fuel is supplied to the pressurizing chamber 18 from a low-pressure pump (not shown). The fuel is pressurized to a high pressure by the plunger 13 moving in the other direction by a cam (not shown). At this time, the solenoid 23 of the electromagnetic spill valve 20 is excited. That is, the spill valve body 22 moves to one side and maintains the fuel pressure in the fuel supply path 21a. The pressurized fuel fills the pressurizing chamber 18 and the fuel supply paths 12b and 21a. When the force applied to the discharge valve body 33a by the fuel pressure becomes larger than the urging force of the discharge valve spring 33b urging the discharge valve body 33a in one direction, the discharge valve body 33a moves in the other direction and opens. I speak. As a result, the high-pressure fuel passes through the discharge valve 33 and is discharged from the discharge port 32a to the fuel supply path 35b.

  When the fuel injection pump 1 stops discharging fuel, the solenoid 23 of the electromagnetic spill valve 20 stops exciting. That is, the spill valve body 22 moves to the other side so that the fuel supply passage 21a communicates with the fuel supply port 11c via the spill valve chamber 21c, the second spill oil discharge passage 21d, and the first spill oil discharge passage 12c. The fuel pressure in the pressure chamber 18 and the fuel supply passages 12b and 21a is released. At this time, when the second spill oil discharge passage 21d has an intersection as in the fuel injection pump 1a shown in FIGS. 4 (a) and 4 (b), the pressure is reflected by the reflection of the released fuel. Although pulsation occurs, the second spill oil discharge passage 21d of the fuel injection pump 1 in the present embodiment is formed linearly, so that the occurrence of pressure pulsation in the discharge passage is reduced. The force applied to the discharge valve body 33a by releasing the fuel pressure becomes smaller than the urging force of the discharge valve spring 33b urging the discharge valve body 33a in one direction, and the discharge valve body 33a The valve closes rapidly due to the urging force. As a result, the high-pressure fuel does not pass through the discharge valve body 33a and is discharged from the discharge port 32a to the fuel supply path 35b. At this time, pulsation is generated in the fuel pressure remaining in the fuel injection nozzle (not shown) from the fuel supply path 35b downstream of the discharge valve 33. When the force applied to the isobaric valve body 34a by the pulsation of the generated fuel pressure is greater than the biasing force of the isobaric valve spring 34b biasing the isobaric valve body 34a in the other direction, the isobaric valve body 34a is in one direction. Move and open the valve. As a result, the fuel pressure increased by the pulsation of the fuel pressure is released and reduced to a predetermined value.

  The fuel injection pump 1 is a PFR type fuel injection pump having a tappet 15 in the fuel injection pump main body 10. However, the fuel injection pump 1 is not limited to this pump. The fuel injection pump 1 has a tappet 15 in the engine. The main body 10 may be a PF type fuel injection pump in which the tappet 15 is not provided.

  As described above, the fuel pressure is applied by driving the pump body 10, the barrel 12 that is built in the pump body 10 and constituting the pressurizing chamber 18, and the spill valve body 22 fixed to the barrel 12 by the solenoid 23. In the fuel injection pump 1 including the electromagnetic spill valve 20 that controls the pressure and the pressure release, the electromagnetic spill valve 20 has one side of the spill valve hole 21b in which the spill valve body 22 is slidably mounted. A guide member 24 and a spill valve body 22 that are fitted to one end of the enlarged diameter portion and spill valve body 22 is slidably mounted. A second spill oil discharge passage 21d that linearly communicates the spill valve chamber 21c formed by being surrounded with the first spill oil discharge passage 12c formed in the barrel 12 is formed. Is. By configuring in this way, the boring process for forming the spill valve chamber 21c can be abolished. Therefore, the size of the inner diameter of the second spill oil discharge passage 21d is not limited by the boring process. It can be determined and the second spill oil discharge passage 21d has no branching portion. Thereby, even if the electromagnetic spill valve 20 is controlled at a complicated timing, the occurrence of pressure pulsation in the discharge path can be reduced, and secondary injection or the like can be suppressed.

  Below, the fuel injection pump 1 which concerns on 2nd embodiment is demonstrated using FIG. Note that, in the following embodiments, the same points as those of the first embodiment described above are denoted by the same reference numerals, the detailed description thereof will be omitted, and differences will be mainly described.

  The pump body 10 is a main structure constituting the fuel injection pump 1. The pump body 10 includes a barrel 42 and the like.

  In the barrel 42, an end surface on the other side (discharge port 32a side) and a fuel supply port (not shown) are communicated with each other via a first spill oil discharge passage 42c. The barrel 42 is formed with a first stepped portion 42d at the other side (discharge port 32a side) end of the first spill oil discharge passage 42c.

  The electromagnetic spill valve 20 controls the fuel injection of the fuel injection pump 1. The electromagnetic spill valve 20 mainly includes an electromagnetic spill valve main body 51, a spill valve body 22, a solenoid 23, a guide member 24, a positioning member 25, a seal member 26, and the like.

  The electromagnetic spill valve main body 51 is a main structure constituting the electromagnetic spill valve 20. The electromagnetic spill valve main body 51 is formed in a substantially rectangular parallelepiped. In the electromagnetic spill valve main body 51, the center position of one side (counter discharge port 32a side, lower side in FIG. 3) and the center position of the other side (discharge port 32a side) end surface are communicated with each other through a fuel supply path 51a. The electromagnetic spill valve main body 51 is formed so that the spill valve hole 51b intersects the fuel supply path 51a perpendicularly (in the horizontal direction in FIG. 3). The electromagnetic spill valve main body 51 has an isobaric valve spring chamber 51e formed at a position centered on the fuel supply passage 51a on the other end face. The electromagnetic spill valve main body 51 is fixedly installed with a bolt or the like with the one end face and the other end face of the barrel 42 being in close contact with each other. The fuel supply passage 51a communicates with a fuel supply port (not shown) through a spill valve hole 51b, a spill valve chamber 51c, a second spill oil discharge passage 51d, and a first spill oil discharge passage 42c.

  The spill valve chamber 51c is a part of a passage that passes when fuel is released. The spill valve chamber 51c is fitted to an enlarged diameter portion where one side of the spill valve hole 51b is formed to have an inner diameter larger than the outer diameter of the spill valve body 22, and one end portion of the enlarged diameter portion, and the spill valve body 22 Is surrounded by a guide member 24 and a spill valve body 22 that are slidably mounted.

  The second spill oil discharge passage 51d is a part of a passage through which the fuel passes when the fuel is released. The second spill oil discharge passage 51d linearly connects the spill valve chamber 51c and the second spill oil discharge passage 51d. The second spill oil discharge passage 51d has a second stepped portion 51f formed on the other side (discharge port 32a side) end.

  The positioning member 25 fixes the position of the barrel 42 and the electromagnetic spill valve main body 51. The positioning member 25 is formed in a hollow cylindrical shape, and is fixed to the first stepped portion 42d and the second stepped portion 51f without a gap, thereby fixing the positions of the barrel 42 and the electromagnetic spill valve body 51. Further, in the positioning member 25, the fuel passing through the second spill oil discharge passage 51d through the hollow portion is supplied to the first spill oil discharge passage 42c.

  The seal member 26 seals the fuel. The seal member 26 is configured by a substantially cylindrical O-ring or the like. The seal member 26 is disposed on the outer peripheral portion of the positioning member 25 and seals fuel leakage from the fitting portion between the positioning member 25 and the first stepped portion 42d and the second stepped portion 51f.

  As described above, the first spill oil discharge passage 42c is formed with the first stepped portion 42d having an inner diameter larger than the inner diameter of the first spill oil discharge passage 42c at the end on the electromagnetic spill valve 20 side. 51d is formed with a second stepped portion 51f having an inner diameter larger than the inner diameter of the second spill oil discharge passage 51d at the barrel 42 side end, and the hollow cylindrical positioning member 25 is formed by the first stepped portion 42d and the second stepped portion. The position of the barrel 42 and the electromagnetic spill valve 20 is fixed by being fitted to the attaching portion 51f. By comprising in this way, the position of the electromagnetic spill valve 20 and the barrel 42 is fixed, so that the first spill oil discharge passage 42c and the second spill oil discharge passage 51d are fixed without being displaced and separately. No processing for positioning pins is required. Thereby, even if the electromagnetic spill valve 20 is controlled at a complicated timing, the occurrence of pressure pulsation in the discharge path can be reduced, and secondary injection or the like can be suppressed.

  The positioning member 25 is characterized in that a seal member 26 is disposed on the outer peripheral portion. By comprising in this way, the oil leak from the communication part of the 1st spill oil discharge path 42c and the 2nd spill oil discharge path 51d can be prevented with a cheap and simple structure. Thereby, even if the electromagnetic spill valve 20 is controlled at a complicated timing, the occurrence of pressure pulsation in the discharge path can be reduced, and secondary injection or the like can be suppressed.

DESCRIPTION OF SYMBOLS 1 Fuel injection pump 10 Pump main-body part 12 Barrel 12c 1st spill oil discharge path 18 Pressurization chamber 20 Electromagnetic spill valve 21b Spill valve hole 21c Spill valve chamber 21d 2nd spill oil discharge path 22 Spill valve body 23 Solenoid 24 Guide member

Claims (2)

An electromagnetic spill that controls pressurization and release of fuel pressure by driving a pump main body, a barrel built in the pump main body and constituting a pressurizing chamber, and a spill valve element fixed to the barrel by a solenoid A fuel injection pump comprising a valve;
On the one side of the spill valve hole of the electromagnetic spill valve body constituting the electromagnetic spill valve, the spill valve body is slidably mounted, and an enlarged diameter portion having an inner diameter larger than the outer diameter of the spill valve body is formed,
A guide member is fitted to the enlarged portion of the spill valve hole, and the spill valve body is slidably mounted on the guide member.
In the electromagnetic spill valve body, a spill valve chamber surrounded by the guide member and the spill valve body is formed,
In the electromagnetic spill valve body, two second spill oil discharge passages composed of oblique holes are formed,
The spill valve chamber and the two first spill oil discharge passages formed in the barrel are linearly communicated by the two second spill oil discharge passages formed of the oblique holes,
Forming a first stepped portion on the electromagnetic spill valve side end of the first spill oil discharge passage formed in the barrel,
A second stepped portion is formed at the barrel side end of the second spill oil discharge passage formed in the spill valve body,
A hollow cylindrical positioning member is fitted to the first stepped portion and the second stepped portion,
The fuel injection pump according to claim 1, wherein the positioning member is formed in a hollow cylindrical shape and communicates the second spill oil discharge passage and the first spill oil discharge passage through the hollow portion . 2. The fuel injection pump according to claim 1, wherein a seal member is disposed on an outer peripheral portion of the positioning member .

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