JP2015169130A - fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve improved in combustion efficiency while reducing manufacturing costs.SOLUTION: An inclined plate 20 supported by a movable core 31 through a restriction member 24 disposed on a position shifted to a sub-through hole 202 side from a center of the movable core 31, is kept into contact with a main needle 21 and a sub-needle 22. When the movable core 31 is attracted to a fixed core 33 by electromagnetic attraction force, the inclined plate 20 is inclined with the restriction member 24 as a fulcrum to be separated from the movable core 31 at a side kept into contact with the sub-needle 22. Thus the sub-needle 22 is separated from a sub-valve seat 196. When the movable core 31 is further attracted to the fixed core 33 after the inclination of the inclined plate 20 becomes constant, the main needle 21 is separated from a main valve seat 195. Thus two injection holes 193, 194 can be opened and closed with time difference by a set of the movable core 31 and the fixed core 33 operating the sub-needle 22 and a coil 35.

Description

  The present invention relates to a fuel injection valve for injecting and supplying fuel to an internal combustion engine (hereinafter referred to as “engine”).

  2. Description of the Related Art Conventionally, a fuel injection valve that controls the opening and closing of a plurality of injection holes formed in a housing and improves the combustion efficiency in a combustion chamber of an internal combustion engine is known. For example, Patent Literature 1 includes a housing having two nozzle holes, two needles accommodated in the housing so as to be reciprocally movable, and one nozzle hole and another nozzle hole at different times. Describes a fuel injection valve that opens and closes.

JP2013-124586A

  However, since the fuel injection valve described in Patent Document 1 includes two operation circuits that control the operations of the two needles, the number of parts increases and the manufacturing cost increases.

  The objective of this invention is providing the fuel injection valve which improves combustion efficiency, reducing manufacturing cost.

  The present invention is a fuel injection valve, and includes a housing, a first needle, a first spring, a second needle, a second spring, a coil, a fixed core, a movable core, and time difference actuating means. The housing has a plurality of injection holes that are formed at one end in the central axis direction and injects fuel, and a plurality of valve seats that are formed around the injection holes. The first needle is accommodated in the housing so as to be capable of reciprocating in the central axis direction of the housing, and opens and closes the first injection holes of the plurality of injection holes when separated from or in contact with the first valve seats of the plurality of valve seats. The first spring biases the first needle so as to contact the first valve seat. The second needle is accommodated in the housing so as to be able to reciprocate in the central axis direction of the housing, and when the second needle is separated or abutted against the second valve seat except the first valve seat of the plurality of valve seats, the first injection holes of the plurality of injection holes The second nozzle hole except for is opened and closed. The second spring biases the second needle so as to contact the second valve seat. The movable core is provided on the valve seat side of the fixed core fixed in the magnetic field generated by the energized coil so as to reciprocate in the central axis direction of the housing. When the coil is energized, it is attracted in the direction of the fixed core. The second needle is separated from the second valve seat. The time difference actuating means is characterized in that after the second needle is separated from the second valve seat, the first needle can be separated from the first valve seat with a time difference.

  The fuel injection valve of the present invention includes two needles that control opening and closing of different nozzle holes. The two needles open the first nozzle hole by the first needle after the second needle opens the second nozzle hole by the time difference operating means. Thus, the fuel injection valve of the present invention can control the operation of the two needles by including one operation circuit that controls the operation of the second needle. Therefore, it is possible to inject fuel so as to reduce the manufacturing cost and to open and close the plurality of nozzle holes with a time difference to improve the combustion efficiency as compared with the case where two operating circuits are provided to operate the two needles.

It is sectional drawing of the fuel injection valve by 1st Embodiment of this invention. It is principal part sectional drawing of the fuel injection valve by 1st Embodiment of this invention. It is a perspective view which shows the positional relationship of the time difference action | operation means and movable core of the fuel injection valve by 1st Embodiment of this invention. It is a schematic diagram explaining the valve opening operation | movement in the fuel injection valve by 1st Embodiment of this invention. It is a characteristic view which shows the time change of the acting force which acts on the movable core at the time of valve opening in the fuel injection valve by 1st Embodiment of this invention, and two needles. It is a characteristic view which shows the time change of the movable core at the time of valve opening in the fuel injection valve by 1st Embodiment of this invention, the displacement of two needles, and the injection rate of two injection holes. It is a mimetic diagram explaining valve closing operation in a fuel injection valve by a 1st embodiment of the present invention. It is a characteristic view which shows the time change of the movable core at the time of valve closing in the fuel injection valve by 1st Embodiment of this invention, the displacement of two needles, and the injection rate of two injection holes. It is a perspective view which shows the positional relationship of the time difference action | operation means and movable core of the fuel injection valve by 2nd Embodiment of this invention. It is a perspective view which shows the positional relationship of the time difference action | operation means and movable core of the fuel injection valve by 3rd Embodiment of this invention. It is a perspective view which shows the positional relationship of the time difference action | operation means and movable core of the fuel injection valve by 4th Embodiment of this invention. It is a perspective view which shows the positional relationship of the time difference action | operation means and movable core of the fuel injection valve by 5th Embodiment of this invention. It is principal part sectional drawing of the fuel injection valve by 6th Embodiment of this invention. It is the XIVa-XIVa sectional view taken on the line of FIG. 13, and the XIVb-XIVb sectional view. It is principal part sectional drawing of the fuel injection valve by 7th Embodiment of this invention. It is the XVIa-XVIa sectional view taken on the line of FIG. 15, and the XVIb-XVIb sectional view. It is principal part sectional drawing of the fuel injection valve by 8th Embodiment of this invention. It is sectional drawing of the fuel injection valve by 9th Embodiment of this invention. It is sectional drawing explaining the valve opening operation | movement in the fuel injection valve by 9th Embodiment of this invention. It is sectional drawing explaining the valve opening operation | movement in the fuel injection valve by 9th Embodiment of this invention, Comprising: It is sectional drawing explaining a state different from FIG. It is sectional drawing of the fuel injection valve by 10th Embodiment of this invention. It is sectional drawing explaining the valve opening operation | movement in the fuel injection valve by 10th Embodiment of this invention. It is sectional drawing explaining the valve opening operation | movement in the fuel injection valve by 10th Embodiment of this invention, Comprising: It is sectional drawing explaining a state different from FIG.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A fuel injection valve 1 according to a first embodiment of the present invention is shown in FIGS.
The fuel injection valve 1 is used, for example, in a fuel injection device of a direct injection gasoline engine (not shown), and injects and supplies gasoline as fuel to the engine. The fuel injection valve 1 includes a housing 15, a main needle 21 as a “first needle”, a main spring 27 as a “first spring”, a sub-needle 22 as a “second needle”, and a sub-needle as a “second spring”. A spring 28, a movable core 31, an inclined plate 20 as a “contact member”, a regulating member 24, a fixed core 33, a coil 35, a valve opening spring 26, and the like are provided. In FIG. 1, the main needle 21 and the sub needle 22 are separated from the main valve seat 195 as the “first valve seat” and the sub valve seat 196 as the “second valve seat” of the housing 15. The valve opening direction and the valve closing direction which is the direction in which the main needle 21 and the sub needle 22 abut on the main valve seat 195 and the sub valve seat 196 are illustrated. The inclined plate 20 and the regulating member 24 correspond to “time difference actuating means” recited in the claims.

  As shown in FIG. 1, the housing 15 includes a first cylinder member 16, a second cylinder member 17, a third cylinder member 18, and an injection nozzle 19. The first cylinder member 16, the second cylinder member 17, and the third cylinder member 18 are all formed in a substantially cylindrical shape, and are coaxial in the order of the first cylinder member 16, the second cylinder member 17, and the third cylinder member 18. And are connected to each other.

  The first cylinder member 16 and the third cylinder member 18 are subjected to a magnetic stabilization process. The first cylinder member 16 and the third cylinder member 18 have a relatively low hardness. On the other hand, the second cylinder member 17 is formed so that the hardness is higher than the hardness of the first cylinder member 16 and the third cylinder member 18.

  The injection nozzle 19 is provided at the end of the first cylinder member 16 opposite to the second cylinder member 17. The injection nozzle 19 is formed in a bottomed cylindrical shape and is welded to the first cylindrical member 16. The injection nozzle 19 is subjected to a quenching process so as to have a predetermined hardness. The injection nozzle 19 is formed of a main injection unit 191 and a sub injection unit 192. The injection nozzle 19 is connected to the first cylinder member 16 at the end opposite to the side where the main injection part 191 and the sub injection part 192 are formed.

  The main injection part 191 is a bottomed cylindrical part provided at a position shifted from the central axis C0 of the housing 15. A main injection hole 193 as a “first injection hole” that communicates the inside and the outside of the housing 15 is formed at the bottom of the main injection part 191. In the fuel injection valve 1 according to the first embodiment, the main injection hole 193 has a relatively large cross-sectional area. An annular main valve seat 195 is formed at the edge of the inner opening which is the opening on the inner side of the housing 15 of the main injection hole 193.

  The sub injection part 192 is a bottomed cylindrical part provided at a position shifted to the opposite side of the main injection part 191 with respect to the central axis of the first cylinder member 16. A sub injection hole 194 serving as a “second injection hole” that communicates the inside and the outside of the housing 15 is formed at the bottom of the sub injection part 192. In the fuel injection valve 1 according to the first embodiment, the sub injection hole 194 is formed so that the cross-sectional area is smaller than the cross-sectional area of the main injection hole 193. An annular sub-valve seat 196 is formed at the edge of the inner opening which is the opening on the inner side of the housing 15 of the sub-injection hole 194. The seat diameter of the sub valve seat 196 and the sub needle 22 is smaller than the seat diameter of the main valve seat 195 and the main needle 21.

  The main needle 21 is accommodated in the housing 15 so as to be reciprocally movable. The main needle 21 is quenched to have a predetermined hardness. The hardness of the main needle 21 is set substantially equal to the hardness of the injection nozzle 19. The main needle 21 is formed of a main shaft portion 211, a main seal portion 212, a main large diameter portion 213, and the like. The main shaft portion 211, the main seal portion 212, and the main large diameter portion 213 are integrally formed.

The main shaft portion 211 is formed in a rod shape. The main shaft portion 211 is inserted through a guide through hole 311 provided in the movable core 31 and a guide through hole 161 provided in a needle guide portion 160 provided in the first cylindrical member 16.
The main seal portion 212 is provided at the end of the main shaft portion 211 on the main valve seat 195 side. The main seal portion 212 can contact the main valve seat 195. The main needle 21 opens or closes the main injection hole 193 when the main seal portion 212 is separated from the main valve seat 195 or abuts on the main valve seat 195, and communicates or blocks the inside and the outside of the housing 15.

  The main large diameter portion 213 is provided on the opposite side of the main shaft portion 211 from the main seal portion 212. The main large diameter portion 213 is formed so that the outer diameter thereof is larger than the outer diameter of the main shaft portion 211. An end surface 216 on the main valve seat 195 side of the main large diameter portion 213 is in contact with the inclined plate 20. A main spring guide portion 214 for guiding the main spring 27 is provided on the opposite side of the main large diameter portion 213 from the main valve seat 195 side.

  The main needle 21 is supported by the inner wall of the second cylindrical member 17 via the movable core 31 while the main shaft portion 211 is supported by the needle guide portion 160. As a result, the main needle 21 reciprocates inside the housing 15 in the direction of the central axis C0.

  The sub-needle 22 is accommodated in the housing 15 so as to be able to reciprocate so as to be adjacent to the main needle 21. The sub-needle 22 is subjected to a quenching process so as to have a predetermined hardness. The hardness of the sub needle 22 is set substantially equal to the hardness of the injection nozzle 19. The sub needle 22 is formed of a sub shaft part 221, a sub seal part 222, a sub large diameter part 223, and the like. The sub shaft part 221, the sub seal part 222, and the sub large diameter part 223 are integrally formed.

The sub shaft portion 221 is formed in a rod shape. The sub shaft portion 221 is inserted into a guide through hole 312 provided in the movable core 31 and a guide through hole 162 provided in the needle guide portion 160.
The seal portion 221 is provided at the end of the sub shaft portion 221 on the sub valve seat 196 side. The seal portion 221 can contact the sub valve seat 196. The sub-needle 22 opens or closes the sub-injection hole 194 when the sub-seal portion 222 is separated from the sub-valve seat 196 or abuts against the sub-valve seat 196, and communicates or blocks the inside and the outside of the housing 15.

  The sub large diameter portion 223 is provided on the side opposite to the sub seal portion 222 of the sub shaft portion 221. The sub large diameter portion 223 is formed so that the outer diameter thereof is larger than the outer diameter of the sub shaft portion 221. An end surface 226 on the sub valve seat 196 side of the sub large diameter portion 223 is in contact with the inclined plate 20. A sub spring guide portion 224 that guides the sub spring 28 is provided on the side opposite to the sub valve seat 196 side of the sub large diameter portion 223.

  The sub needle 22 is supported by the inner wall of the second cylindrical member 17 through the movable core 31 while the sub shaft portion 221 is supported by the needle guide portion 160. Thereby, the sub-needle 22 reciprocates in the direction of the central axis C0 inside the housing 15.

  The movable core 31 is formed in a substantially cylindrical shape with a magnetic material such as ferritic stainless steel, for example, and has a surface plated with chromium, for example. The movable core 31 is subjected to a magnetic stabilization process. The hardness of the movable core 31 is relatively low and is substantially equal to the hardness of the first cylindrical member 16 and the third cylindrical member 18 of the housing 15.

  The fixed core 33 is formed in a substantially cylindrical shape by a magnetic material such as ferritic stainless steel. The fixed core 33 is subjected to a magnetic stabilization process. The hardness of the fixed core 33 is substantially equal to the hardness of the movable core 31, but in order to ensure the function as a stopper of the movable core 31, for example, chrome plating is applied to the surface to ensure the necessary hardness. The fixed core 33 is welded to the third cylindrical member 18 of the housing 15 and is provided to be fixed inside the housing 15. A substantially cylindrical space is formed at the end of the fixed core 33 on the movable core 31 side. A main spring guide 331 and a sub spring guide 332 are accommodated in the space.

  The coil 35 is formed in a substantially cylindrical shape, and is provided so as to mainly surround the second cylinder member 17 and the third cylinder member 18 in the radial direction. The coil 35 generates a magnetic force when electric power is supplied. When a magnetic force is generated in the coil 35, a magnetic circuit is formed in the fixed core 33, the movable core 31, the first cylindrical member 16, and the third cylindrical member 18. Thereby, a magnetic attractive force is generated between the fixed core 33 and the movable core 31, and the movable core 31 is attracted to the fixed core 33.

  The main spring 27 is provided so that one end of the main spring 27 comes into contact with a spring contact surface 215 on the side where the main spring guide portion 214 of the main large diameter portion 213 is provided. The other end of the main spring 27 is in contact with the main spring guide 331. The main spring 27 has a biasing force that biases the main needle 21 in the direction of the main valve seat 195, that is, the valve closing direction, together with the inclined plate 20, the regulating member 24, and the movable core 31.

  The sub spring 28 is provided so that one end thereof is in contact with the spring contact surface 225 on the side where the sub spring guide portion 224 of the sub large diameter portion 223 is provided. The other end of the sub spring 28 is in contact with the sub spring guide 332. The sub spring 28 has a biasing force that biases the sub needle 22 in the direction of the sub valve seat 196, that is, the valve closing direction, together with the inclined plate 20, the regulating member 24, and the movable core 31. The biasing force that the subspring 28 has is relatively weaker than the biasing force that the main spring 27 has.

One end of the valve-opening spring 26 is provided in contact with the main valve seat 195 and the sub valve seat 196 side of the movable core 31. The other end of the valve opening spring 26 is in contact with the movable core 31 side of the needle guide portion 160. The valve opening spring 26 has a force that extends in the direction of the central axis C0. The main needle 21 and the sub needle 22 are inserted into the valve opening spring 26. Thereby, the valve opening spring 26 urges the movable core 31 in a direction opposite to the main valve seat 195 and the sub valve seat 196, that is, in the valve opening direction.
In the present embodiment, the sum of the urging force of the main spring 27 and the urging force of the sub spring 28 is set to be larger than the urging force of the valve opening spring 26. Thereby, in a state where power is not supplied to the coil 35, the main needle 21 is in contact with the main valve seat 195, and the sub needle 22 is in contact with the sub valve seat 196.

A substantially cylindrical fuel introduction pipe 12 is press-fitted and welded to the end of the third cylinder member 18 opposite to the second cylinder member 17.
The radially outer sides of the fuel introduction pipe 12 and the third cylinder member 18 are molded with resin. A connector 13 is formed in the mold part. The connector 13 is insert-molded with a terminal 131 for supplying power to the coil 35. A cylindrical holder 14 is provided outside the coil 35 in the radial direction so as to cover the coil 35.

  The fuel flowing into the housing 15 from the opening 121 of the fuel introduction pipe 12 enters the inside of the fixed core 33, the guide through holes 311 and 312 of the movable core 31, the inside of the first cylinder member, and the needle guide portion 160. It flows through the formed passage 163 and is guided into the injection nozzle 19.

  The fuel injection valve 1 according to the first embodiment is characterized in that the inclined plate 20 and the regulating member 24 are provided as “time difference actuating means” for actuating the main needle 21 and the sub needle 22 with a time difference. Here, the detailed configurations of the inclined plate 20 and the regulating member 24 will be described including the positional relationship with the movable core 31.

  FIG. 3 is a perspective view showing the positional relationship among the inclined plate 20, the regulating member 24, and the movable core 31. FIG. 3 shows a state in which the main needle 21 is disassembled in the axial direction in order to facilitate understanding of the mutual positional relationship.

  The inclined plate 20 is a disk-shaped member, and is accommodated in the accommodation space 310 provided on the fixed core 33 side of the movable core 31. The inclined plate 20 has a main through hole 201 as a “first through hole” through which the main needle 21 is inserted, and a sub through hole 202 as a “second through hole” through which the sub needle 22 is inserted. The end surface 203 as the “end surface of the contact member on the movable core side” on the movable core 31 side of the inclined plate 20 has a recess 204 as a “contact member recess” in which a part of a regulating member 24 described later is accommodated. Is formed. The recess 204 is formed closer to the sub through hole 202 than the main through hole 201. A projecting portion 205 that projects in the direction of the movable core 31 is formed at the radially outer end of the main through hole 201 of the inclined plate 20.

Two inclined surfaces 206 and 207 are formed on the end surface of the inclined plate 20 on the fixed core 33 side.
The inclined surface 206 as the “first inclined surface” is formed at the edge of the main through-hole 201 and is inclined toward the movable core 31 from the radially outer side of the inclined plate 20 toward the center. The inclined surface 206 can come into contact with the end surface 216 on the inclined plate 20 side of the main large diameter portion 213 of the main needle 21.
The inclined surface 207 as the “second inclined surface” is formed at the edge of the sub through-hole 202 and is inclined toward the movable core 31 from the center of the inclined plate 20 toward the radially outer side. The inclination of the inclined surface 207 is smaller than the inclination of the inclined surface 206. The inclined surface 207 can contact the end surface 226 on the inclined plate 20 side of the sub large diameter portion 223 of the sub needle 22.

  The regulating member 24 is a spherical member provided between the inclined plate 20 and the movable core 31. A part of the regulating member 24 is a “core depression” formed on the inner wall 313 as the “end surface on the abutting member side of the movable core” facing the end surface 203 among the inner walls forming the accommodation space 310 of the movable core 31. In the recess 314. When the regulating member 24 is accommodated in the recesses 204 and 314, the distance between the end surface 203 of the inclined plate 20 and the inner wall 313 of the movable core 31 in the vicinity of the regulating member 24 is regulated to be constant. When the inner wall 313 and the end surface 203 are in a substantially parallel state, the restricting member 24 has a distance between the end surface 203 of the inclined plate 20 and the inner wall 313 of the movable core 31 in the vicinity of the restricting member 24. And the inner wall 313 of the movable core 31 is formed to be longer than the distance.

Next, the operation of the fuel injection valve 1 according to the first embodiment will be described with reference to FIGS.
FIG. 4 is a schematic diagram showing the positional relationship between the inclined plate 20, the regulating member 24, and the movable core 31 when the fuel injection valve 1 is opened. FIG. 5 is a characteristic diagram showing temporal changes in the magnitude of the acting force acting on the movable core 31, the main needle 21, and the sub-needle 22 when the fuel injection valve 1 is opened. FIG. 6 is a characteristic diagram showing the displacement of the movable core 31, the main needle 21, and the sub needle 22 and the change over time of the injection rate of fuel injected from the main injection holes 193 and 194 when the fuel injection valve 1 is opened. . FIG. 7 is a schematic diagram showing the positional relationship between the inclined plate 20, the regulating member 24, and the movable core 31 when the fuel injection valve 1 is closed. FIG. 8 is a characteristic diagram showing temporal changes in the magnitude of the acting force acting on the movable core 31, the main needle 21, and the sub needle 22 when the fuel injection valve 1 is closed.

First, the opening time of the fuel injection valve 1 will be described with reference to FIG.
When electric power is not supplied to the coil 35, the main needle 21 and the sub needle 22 are moved to the main valve seat 195 and the sub valve 22 by the pressure of the fuel inside the injection nozzle 19 in addition to the urging force of the main spring 27 and the sub spring 28, respectively. It is in contact with the valve seat 196. The positional relationship among the main needle 21, the sub needle 22, the inclined plate 20, the regulating member 24, and the movable core 31 at this time is as shown in FIG. As shown in FIG. 4A, the distance between the end surface 203 and the inner wall 313 is kept constant by the regulating member 24 in the vicinity of the regulating member 24. On the other hand, a gap 200 is formed between the protrusion 205 and the inner wall 313. In addition, the position of the end surface 315 by the side of the main valve seat 195 and the sub valve seat 196 of the movable core 31 in Fig.4 (a) is shown with the dashed-two dotted line B1. Further, the positions of the main large diameter portion 213 of the main needle 21 and the sub large diameter portion 223 of the sub needle 22 in FIG. 4A are indicated by a two-dot chain line B2. In FIG. 4, two-dot chain lines B <b> 1 and B <b> 2 shown in FIGS. 4A to 4D indicate the height reference of each member.

  When electric power is supplied to the coil 35 and an electromagnetic attractive force is generated between the movable core 31 and the fixed core 33, the movable core 31 moves in the direction of the white arrow D1 shown in FIGS. . At this time, a constant distance is maintained by the regulating member 24 between the end surface 203 and the inner wall 313 in the vicinity of the regulating member 24 and does not change.

  On the other hand, the sum of the acting forces calculated from the product of the urging force of the main spring 27 and the fuel pressure inside the main injection unit 191 and the seat diameter in the main injection unit 191 is the urging force of the sub spring 28 and the sub injection unit. Since the sum of the acting forces calculated from the product of the fuel pressure inside 192 and the seat diameter in the sub-injection portion 192 is larger, the protruding portion 205 forming the gap 200 with the movable core 31 is It is pushed into the movable core 31 by the urging force of the main spring 27 and the fuel inside the main injection part 191. As a result, as shown in FIG. 4B, the inclined plate 20 is separated from the movable core 31 at the end on the side having the sub through-hole 202 with the portion in contact with the regulating member 24 as a fulcrum. The end portion on the side having the main through hole 201 is inclined so as to approach the movable core 31.

  Furthermore, when the movable core 31 moves in the direction of the white arrow D1, the inclination of the inclined plate 20 increases. When the inclination of the inclined plate 20 increases, the end portion on the side having the sub through hole 202 is further away from the movable core 31. As a result, as shown in FIG. 4C, the end surface 226 of the sub-needle 22 comes into contact with the inclined surface 207 of the inclined plate 20. When the end surface 226 contacts the inclined surface 207, the sub needle 22 is separated from the sub valve seat 196 according to the movement of the movable core 31, and fuel is injected from the sub injection hole 194.

  Further, when the movable core 31 moves in the direction of the white arrow D1 shown in FIG. 4, the end surface 216 of the main needle 21 comes into contact with the inclined surface 206 of the inclined plate 20. When the end surface 216 comes into contact with the inclined surface 206, the main needle 21 is separated from the main valve seat 195 according to the movement of the movable core 31. Thereby, fuel is injected from the main injection hole 193.

  The change of each acting force in the movement of the main needle 21, the sub-needle 22, and the movable core 31 described based on FIG. 4 will be described based on FIG. Note that “upward” on the vertical axis of the characteristic diagram shown in FIG. 5 is the same as the direction of the white arrow D1 shown in FIG. In FIG. 5, the acting force of the movable core 31 is indicated by a dotted line L50, the acting force of the main needle 21 is indicated by a one-dot chain line L51, and the acting force of the sub needle 22 is indicated by a solid line L52.

  When power is not supplied to the coil 35, the main needle 21 is calculated from the product of the fuel pressure inside the main injection part 191 and the seat diameter in the main injection part 191 in addition to the urging force MF11 of the main spring 27. The acting force MF12 acts downward, that is, in the direction in which the main needle 21 contacts the main valve seat 195. On the other hand, in addition to the urging force MF21 of the sub-spring 28, the sub-needle 22 has an acting force MF22 calculated from the product of the fuel pressure inside the sub-injection unit 192 and the seat diameter in the sub-injection unit 192, that is, The needle 22 acts in the direction in which it contacts the sub valve seat 196. At this time, the sum of the urging force MF11 and the acting force MF12 acting on the main needle 21 is larger than the sum of the urging force MF21 and the acting force MF22 acting on the sub needle 22.

  When electric power starts to be supplied to the coil 35 (time T10 in FIG. 5), after a certain period of time, the movable core 31 faces upward by the electromagnetic attractive force between the movable core 31 and the fixed core 33, that is, the main valve seat 195. And it moves in the direction away from the sub valve seat 196 (time T11 in FIG. 5). When the movable core 31 moves in a direction away from the main valve seat 195 and the sub valve seat 196, the inclined plate 20 is inclined, and an upward acting force acts on the sub needle 22 at the same time as the movable core 31 moves upward. Further, since the main needle 21 is in contact with the end portion on the side closer to the movable core 31 due to the inclination of the inclined plate 20, an upward load acts later than the sub needle 22 (time T12 in FIG. 5).

  When the upward acting force acting on the movable core 31 is further increased, the inclination of the inclined plate 20 is further increased. Specifically, the end on the side where the regulating member 24 abuts, that is, the end on the side on which the sub-needle 22 abuts is further away from the movable core 31 and the side on which the regulating member 24 abuts. The end on the opposite side, that is, the end on the side on which the main needle 21 abuts further approaches the movable core 31. At this time, since the movable core 31 moves upward, an upward force continues to act on the main needle 21 and the sub-needle 22.

  In the middle of increasing the inclination of the inclined plate 20, the sum of the acting forces acting on the sub-needle 22 becomes upward, and the sub-injection hole 194 is opened (time T <b> 13 in FIG. 5). At this time, since the pressure of the fuel inside the injection nozzle 19 is reduced by the injection from the sub injection hole 194, the acting force due to the pressure of the fuel inside the injection nozzle 19 is reduced, and both the main needle 21 and the sub needle 22 act. The acting force changes greatly.

  When the inclination of the inclined plate 20 is further increased and the protruding portion 205 of the inclined plate 20 comes into contact with the movable core 31, the change in the inclination of the inclined plate 20 is completed (time T14 in FIG. 5). That is, the inclined plate 20 continues to incline from time T11 to time T14. When the movable core 31 moves further upward at time T <b> 14, the sum of the acting forces acting on the main needle 21 becomes upward, and the main injection hole 193 is opened.

  FIG. 6 shows the displacement of the movable core 31, the main needle 21, and the sub-needle 22 at the time of valve opening shown in FIG. 4, and the time change of the injection rate of the fuel injected from the main injection holes 193 and 194. Note that the “displacement” shown on the vertical axis of the characteristic diagram shown in FIG. 6 indicates the displacement in the direction of the white arrow D1 shown in FIG. 4 as a plus. In FIG. 6A, the displacement of the movable core 31 is indicated by a dotted line L60, the displacement of the main needle 21 is indicated by a one-dot chain line L61, and the displacement of the sub needle 22 is indicated by a solid line L62. In FIG. 6B, the injection rate of the main injection hole 193 is indicated by a one-dot chain line L66, and the injection rate of the sub injection hole 194 is indicated by a solid line L67.

  As shown in FIG. 6, when the movable core 31 starts to be displaced positively at time T20, the time between time T11 and time T12 elapses in FIG. Begins to displace. When the sub-needle 22 starts to be displaced, a displacement due to the inclination of the inclined plate 20 is added in addition to the displacement of the movable core 31, so that the displacement amount per unit time is larger than the displacement amount per unit time unit of the movable core 31. Become. Thereafter, when the change in the inclination of the inclined plate 20 is finished and the main needle 21 starts to be displaced (time T21 in FIG. 6), the main needle 21, the sub needle 22 and the movable core 31 are displaced at the same speed.

  If the main needle 21 and the sub needle 22 continue to be displaced, the sub injection hole 194 is completely opened first, and the injection rate is determined by the size of the sub injection hole 194 (after time T22 in FIG. 6). Subsequently, the main injection hole 193 is also completely opened, and the injection rate is determined by the size of the main injection hole 193 (after time T23 in FIG. 6). Thereafter, the movable core 31 moves until it contacts the fixed core 33, and the displacement of the movable core 31, the main needle 21, and the sub needle 22 becomes constant (time T24 in FIG. 6).

Next, the closing time of the fuel injection valve 1 will be described with reference to FIG.
In a state where the main needle 21 and the sub needle 22 are separated from the main valve seat 195 and the sub valve seat 196 and fuel is injected from the main injection holes 193 and 194 (see FIG. 7A), the electric power to the coil 35 is When the supply stops, the movable core 31 moves in the direction of the white arrow D2 in FIG. In addition, the position of the end surface 315 by the side of the main valve seat 195 and the sub valve seat 196 of the movable core 31 in FIG.7 (d) is shown with the dashed-two dotted line B1. Moreover, the position of the main large diameter part 213 of the main needle 21 and the sub large diameter part 223 of the subneedle 22 in FIG.7 (d) is shown with the dashed-two dotted line B2. In FIG. 7, two-dot chain lines B <b> 1 and B <b> 2 shown in FIGS. 7A to 7D indicate the height reference of each member.

  After the movable core 31 moves from the state of FIG. 7A in the direction of the white arrow D2 in FIG. 7 and becomes the state of FIG. 7B, the movable core 31 further moves in the direction of the white arrow D2 in FIG. When it moves, the inclination of the inclined plate 20 starts to become gentle. At this time, the end surface 216 of the main needle 21 is separated from the inclined surface 206 of the inclined plate 20. As a result, the main needle 21 contacts the main valve seat 195 and the main injection hole 193 is closed.

  When the movable core 31 further moves in the direction of the white arrow D2 in FIG. 7, when the inclination of the inclined plate 20 becomes further gentle, the end surface 226 of the sub-needle 22 is separated from the inclined surface 207 of the inclined plate 20 (FIG. 7 ( c)). Thereby, the sub needle 22 contacts the sub valve seat 196 and the sub injection hole 194 is closed.

  Further, when the movable core 31 moves in the direction of the white arrow D2 in FIG. 7, the protrusion 205 is separated from the inner wall 313 of the movable core 31, and the inclined plate 20 is in a horizontal state as shown in FIG. Become.

  FIG. 8 shows the displacement of the movable core 31, the main needle 21, and the sub-needle 22 at the time of closing the valve shown in FIG. 7 and the change over time in the injection rate of the fuel injected from the main injection holes 193 and 194. Note that the “displacement” shown on the vertical axis of the characteristic diagram shown in FIG. 8 indicates the displacement in the direction of the white arrow D3 shown in FIG. 7 as a plus. In FIG. 8A, the displacement of the movable core 31 is indicated by a dotted line L80, the displacement of the main needle 21 is indicated by a one-dot chain line L81, and the displacement of the sub needle 22 is indicated by a solid line L82. Further, in FIG. 8B, the injection rate of the main injection hole 193 is indicated by a one-dot chain line L86, and the injection rate of the sub injection hole 194 is indicated by a solid line L87.

As shown in FIG. 8, when the movable core 31 starts to be displaced in the minus direction at time T30, the main needle 21 and the sub-needle 22 simultaneously begin to be displaced in the minus direction. At this time, since the inclination of the inclined plate 20 is constant, the main needle 21, the sub needle 22, and the movable core 31 are displaced at the same speed. The injection rate of the main needle 21 and the sub needle 22 decreases as the displacement decreases (time T31, T32). When the displacement of the main needle 21 becomes zero at time T33, the main injection hole 193 is closed and the injection rate becomes zero.
Thereafter, the sub-needle 22 is displaced by the inclination of the inclined plate 20 in addition to the displacement of the movable core 31, so that the displacement amount per unit time is increased. At time T34, when the displacement of the movable core 31 becomes zero, the displacement of the subneedle 22 also becomes zero almost simultaneously. Thereby, the injection rate of the sub injection hole 194 becomes zero.

  In the fuel injection valve 1 according to the first embodiment, the inclined plate 20 supported by the movable core 31 via the restricting member 24 that contacts the position shifted from the center of the movable core 31 is formed on the main needle 21 and the sub needle 22. It is in contact. When the fuel injection valve 1 is opened, when the movable core 31 moves, the inclined plate 20 is inclined with the regulating member 24 as a fulcrum. Due to this inclination, the sub-needle 22 urged by the sub-spring 28 having a smaller urging force than the main spring 27 opens the sub-injection hole 194. Further, when the movable core 31 moves, the main needle 21 opens the main injection hole 193 against the urging force of the main spring 27. As described above, the fuel injection valve 1 opens the two main injection holes 193 and 194 with a time difference by the set of the movable core 31, the fixed core 33, and the coil 35 that constitute the operation circuit that operates the sub needle 22. be able to. Thus, the fuel injection valve 1 according to the first embodiment improves the combustion efficiency of the combustion chamber of the engine while reducing the manufacturing cost as compared with the case where two sets of operation circuits are provided to operate the two needles. Fuel can be injected.

  The seat diameter of the sub valve seat 196 and the sub needle 22 is smaller than the seat diameter of the main valve seat 195 and the main needle 21. As a result, the pressure of the fuel acting on the main needle 21 in the valve closing direction becomes larger than the pressure of the fuel acting on the sub needle 22 in the valve closing direction. Therefore, there can be a relatively large time difference between the valve opening time of the sub-needle 22 and the valve opening time of the main needle 21, and fuel can be injected to further improve the combustion efficiency of the combustion chamber of the engine. it can.

  Further, the inclined surfaces 206 and 207 of the inclined plate 20 are formed so as to come into contact with the end surface 216 of the main needle 21 and the end surface 226 of the sub needle 22 when the inclined plate 20 is inclined. Thus, when the main injection holes 193 and 194 are opened and closed, the main needle 21 and the sub needle 22 are surely brought into contact with the main valve seat 195 and the sub valve seat 196. Therefore, it is possible to prevent the occurrence of poor sealing in the main valve seat 195 and the sub valve seat 196.

(Second Embodiment)
Next, the fuel injection valve by 2nd Embodiment of this invention is demonstrated based on FIG. The second embodiment is different from the first embodiment in the shape of the inclined plate and the shape of the regulating member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  The fuel injection valve according to the second embodiment includes a regulating member 44 as “time difference actuating means”. FIG. 9 is a perspective view showing the positional relationship between the inclined plate 40 as the “contact member”, the regulating member 44, and the movable core 31. FIG. 9 shows a state in which the main needle 21 is disassembled in the axial direction for easy understanding of the mutual positional relationship. The inclined plate 40 and the regulating member 44 correspond to “time difference actuating means” described in the claims.

  The inclined plate 40 is a disk-shaped member, and is accommodated in the accommodating space 310 provided on the movable plate 31 on the inclined plate 40 side. The inclined plate 40 has a main through hole 401 as a “first through hole” through which the main needle 21 is inserted, and a sub through hole 402 as a “second through hole” through which the sub needle 22 is inserted. The end surface 403 as the “end surface of the contact member on the movable core side” on the movable core 31 side of the inclined plate 40 has a recess 404 as a groove-shaped “contact member recess” in which a part of the regulating member 44 is accommodated. Is formed. The depression 404 is formed closer to the sub through hole 402 than the main through hole 401. A protruding portion 405 that protrudes in the direction of the movable core 31 is formed on the radially outer side of the main through hole 401 of the inclined plate 40.

  An inclined surface 406 as a “first inclined surface” is formed on the end surface opposite to the end surface 403 of the inclined plate 40. The inclined surface 406 is formed at the edge of the main through hole 401 and is inclined toward the movable core 31 from the radially outer side of the inclined plate 40 toward the center. The inclined surface 406 can contact the end surface 216 of the main large diameter portion 213 of the main needle 21 on the inclined plate 40 side.

  The restriction member 44 is a columnar member provided between the inclined plate 20 and the movable core 31. The restricting member 44 is formed of a circular bottom surface, a circular upper surface 441 provided in parallel with the bottom surface, and a side surface 442 connecting the outer periphery of the bottom surface and the outer periphery of the upper surface 441. A part of the regulating member 44 is accommodated in a recess 414 as a groove-shaped “core recess” formed in the inner wall 313 of the movable core 31. At this time, the side surface 442 comes into contact with the inner wall forming the recess 414. Further, a part of the regulating member 44 that is accommodated in the depression 414 is partly housed in a groove-like depression 404 formed on the end surface 403 of the inclined plate 20.

  When the restriction member 44 is accommodated in the depressions 404 and 414, the distance between the end surface 403 and the inner wall 313 in the vicinity of the restriction member 44 is restricted to be constant. In the restricting member 44, the distance between the end surface 403 and the inner wall 313 in the vicinity of the restricting member 44 when the restricting member 44 is accommodated in the depressions 404 and 414 is longer than the distance between the protruding portion 405 and the inner wall 313. It is formed as follows.

  In the fuel injection valve according to the second embodiment, the inclined plate 40 supported by the movable core 31 via the restricting member 44 that is in contact with the position shifted from the center of the movable core 31 toward the sub through-hole 402 side is the main needle 21 and Abutting on the sub-needle 22. Thereby, the fuel injection valve by 2nd Embodiment has the same effect as 1st Embodiment.

(Third embodiment)
Next, the fuel injection valve by 3rd Embodiment of this invention is demonstrated based on FIG. The third embodiment is different from the second embodiment in the shape of the inclined plate. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 2nd Embodiment, and description is abbreviate | omitted.

  The fuel injection valve according to the third embodiment includes an inclined plate 45 as “abutting member” and “time difference actuating means”. FIG. 10 is a perspective view showing the positional relationship between the inclined plate 45 and the movable core 31. FIG. 10 shows a state in which the main needle 21 is disassembled in the axial direction for easy understanding of the mutual positional relationship.

  The inclined plate 45 is a disk-shaped member and is accommodated in an accommodating space 310 provided on the movable plate 31 on the inclined plate 45 side. The inclined plate 45 includes a main through hole 451 through which the main needle 21 is inserted, and a sub through hole 452 as a “second through hole” through which the sub needle 22 is inserted. On the end surface 453 of the inclined plate 45 on the movable core 31 side, a restriction portion 450 as a “restriction member” and a “time difference actuating means” is formed. A protruding portion 455 that protrudes in the direction of the movable core 31 is formed on the radially outer side of the main through hole 451 of the inclined plate 45.

  An inclined surface 456 as a “first inclined surface” is formed on the end surface of the inclined plate 45 opposite to the end surface 453. The inclined surface 456 is formed at the edge of the main through hole 451 and is inclined from the radially outer side of the inclined plate 45 toward the center toward the movable core 31. The inclined surface 456 can come into contact with the end surface 216 on the inclined plate 45 side of the main large diameter portion 213 of the main needle 21.

  As shown in FIG. 10, the restricting portion 450 is formed so as to protrude in the direction of the movable core 31. The restricting portion 450 is formed so as to become thinner toward the movable core 31. A part of the restricting portion 450 is accommodated in a recess 464 as a groove-shaped “core recess” formed in the inner wall 313 of the movable core 31.

  When the restriction portion 450 is accommodated in the recess 464, the distance between the end surface 453 and the inner wall 313 in the vicinity of the restriction portion 450 is restricted to be constant. The restricting portion 450 is formed such that the distance between the end surface 453 and the inner wall 313 in the vicinity of the restricting portion 450 when the restricting portion 450 is accommodated in the recess 464 is longer than the distance between the protruding portion 455 and the inner wall 313. Has been.

  In the fuel injection valve according to the third embodiment, the inclined plate 45 that contacts the movable core 31 by the restricting portion 450 that contacts the position shifted from the center of the movable core 31 toward the sub through-hole 452 is formed on the main needle 21 and the sub needle 22. It is in contact. Thereby, the fuel injection valve by 3rd Embodiment has the same effect as 1st Embodiment.

(Fourth embodiment)
Next, the fuel injection valve by 4th Embodiment of this invention is demonstrated based on FIG. The fourth embodiment is different from the third embodiment in the shape of the inclined plate. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 3rd Embodiment, and description is abbreviate | omitted.

  The fuel injection valve according to the fourth embodiment includes an inclined plate 50 as a “contact member” and a “time difference actuating means”. In FIG. 11, the perspective view which shows the positional relationship of the inclination board 50 and the movable core 31 is shown. FIG. 11 shows a state in which the main needle 21 is disassembled in the axial direction in order to facilitate understanding of the mutual positional relationship.

  The inclined plate 50 is a disk-shaped member and is accommodated in the accommodating space 310 provided on the movable plate 31 on the inclined plate 50 side. The inclined plate 50 has a main through hole 501 as a “first through hole” through which the main needle 21 is inserted, and a sub through hole 502 as a “second through hole” through which the sub needle 22 is inserted. On the end surface 503 of the inclined plate 50 on the movable core 31 side, a restriction portion 500 as a “restriction member” and a “time difference actuating means” is formed. Unlike the inclined plate 45 of the third embodiment, the inclined plate 50 of the fourth embodiment has no protrusion protruding in the direction of the movable core 31 in the vicinity of the main through hole 501.

  The restricting portion 500 is formed so as to protrude in the direction of the movable core 31. The restricting portion 500 is formed so as to protrude in the direction of the movable core 31. The restricting portion 500 is formed so as to become thinner toward the direction of the movable core 31. A part of the restricting portion 500 is accommodated in a recess 514 as a groove-shaped “core recess” formed in the inner wall 313 of the movable core 31.

  An inclined surface 506 as a “first inclined surface” is formed on the end surface of the inclined plate 50 opposite to the end surface 503. The inclined surface 506 is formed at the edge of the main through-hole 501 and is inclined toward the movable core 31 from the radially outer side of the inclined plate 50 toward the center. The inclined surface 506 can come into contact with the end surface 216 on the inclined plate 50 side of the main large diameter portion 213 of the main needle 21.

  In the fuel injection valve according to the fourth embodiment, the inclined plate 50 that abuts the movable core 31 against the main needle 21 and the subneedle 22 by the restricting portion 500 that abuts the position shifted from the center of the movable core 31 toward the sub through-hole 502 side. It touches. Thereby, the fuel injection valve by 4th Embodiment has the same effect as 1st Embodiment.

(Fifth embodiment)
Next, a fuel injection valve according to a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment differs from the fourth embodiment in the shape of the inclined plate. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 4th Embodiment, and description is abbreviate | omitted.

  The fuel injection valve according to the fifth embodiment includes an inclined plate 55 as a “contact member” and a “time difference actuating means”. FIG. 12 is a perspective view showing the positional relationship between the inclined plate 55 and the movable core 31. FIG. 12 shows a state in which the main needle 21 is disassembled in the axial direction in order to make the positional relationship easy to understand.

  The inclined plate 55 is a disk-shaped member and is accommodated in an accommodating space 310 provided on the movable plate 31 on the inclined plate 55 side. The inclined plate 55 has a main through hole 551 as a “first through hole” through which the main needle 21 is inserted, and a sub through hole 552 as a “second through hole” through which the sub needle 22 is inserted. The movable plate 31 side of the inclined plate 55 has two inclined surfaces 553 and 554. The inclined surface 553 as the “inclined surface on the movable core side of the contact member” is formed so as to approach the movable core 31 from the end on the main through-hole 551 side toward the center of the inclined plate 55. Further, the inclined surface 554 as the “inclined surface on the movable core side of the contact member” is formed so as to approach the movable core 31 from the end portion on the sub through-hole 552 side toward the center of the inclined plate 55. The inclined surface 553 and the inclined surface 554 are connected in the vicinity of the sub through hole 552. As a result, the “regulating member” and the portion 550 as the “time difference actuating means” where the inclined surface 553 and the inclined surface 554 are connected protrude in the shape of a protrusion on the movable core 31 side. Part of the portion 550 is accommodated in a recess 564 as a groove-shaped “core recess” formed in the inner wall 313 of the movable core 31.

  An inclined surface 556 as a “first inclined surface” is formed on the end surface of the inclined plate 55 opposite to the end surface 553. The inclined surface 556 is formed at the edge of the main through hole 551 and is inclined toward the movable core 31 from the radially outer side of the inclined plate 55 toward the center. The inclined surface 556 can contact the end surface 216 of the main large diameter portion 213 of the main needle 21 on the inclined plate 55 side.

  In the fuel injection valve according to the fifth embodiment, the inclined plate 55 that contacts the movable core 31 by the portion 550 that contacts the position shifted from the center of the movable core 31 toward the sub through-hole 552 contacts the main needle 21 and the sub needle 22. It touches. Thereby, the fuel injection valve by 5th Embodiment has the same effect as 1st Embodiment.

(Sixth embodiment)
Next, a fuel injection valve according to a sixth embodiment of the present invention will be described with reference to FIGS. The sixth embodiment differs from the first embodiment in the shape of the movable core and the shape of the fixed core. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

In the fuel injection valve 6 according to the sixth embodiment, the movable core 61 has a groove-shaped movable core side accommodation space 610 at an end portion on the fixed core 63 side. The inclined plate 20 is accommodated in the movable core side accommodating space 610. The inner wall 613 that faces the end surface 203 of the inclined plate 20 among the inner walls that form the movable core side accommodation space 610 is formed with a recess 614 that accommodates the regulating member 24.
The movable core 61 has a guide through hole 611 through which the main needle 21 is inserted in the direction of the central axis C0 and a guide through hole 612 through which the sub needle 22 is inserted in the direction of the central axis C0.

  The fixed core 63 has a groove-shaped fixed core side accommodation space 630 at the end on the movable core 61 side. The fixed core side accommodation space 630 is formed to have the same size as the movable core side accommodation space 610, and the main spring 27 and the sub spring 28 are accommodated therein. One end of each of the main spring 27 and the sub spring 28 is in contact with the inner wall 631 that faces the inclined plate 20 among the inner walls that form the fixed core-side accommodation space 630.

  In the fuel injection valve 6 according to the sixth embodiment, the movable core 61 and the fixed core 63 are formed so that the areas where they can contact each other are larger than those in the first embodiment. Thereby, when electric power is supplied to the coil 35, the cross-sectional area of the magnetic circuit formed inside can be increased. Therefore, the fuel injection valve 6 according to the sixth embodiment can control the two needles with a small amount of electric power in addition to the effects of the first embodiment.

(Seventh embodiment)
Next, the fuel injection valve by 7th Embodiment of this invention is demonstrated based on FIG. The seventh embodiment is different from the sixth embodiment in that a guide member is provided on the movable core side of the fixed core. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 6th Embodiment, and description is abbreviate | omitted.

  In the fuel injection valve 7 according to the seventh embodiment, guide members 62 and 64 are provided at both ends of the fixed core side accommodation space 630 of the fixed core 63. The guide members 62 and 64 guide the main needle 21 and the sub needle 22 that reciprocate.

  In the fuel injection valve 7 according to the seventh embodiment, the main needle 21 and the sub needle 22 are guided by guide members 62 and 64. Accordingly, the main needle 21 and the sub needle 22 can be reliably operated while increasing the cross-sectional area of the magnetic circuit. Therefore, the seventh embodiment can reliably control the opening and closing of the main injection holes 193 and 194 in addition to the effects of the sixth embodiment.

(Eighth embodiment)
Next, a fuel injection valve according to an eighth embodiment of the present invention will be described with reference to FIG. The eighth embodiment differs from the first embodiment in the shape of the seal portion of the two needles. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

In the fuel injection valve 8 according to the eighth embodiment, the seal portion 662 as the “first seal portion” of the main needle 21 is formed in a hemispherical shape having a spherical surface. The outer wall of the seal portion 662 is partially chamfered so that the fuel in the injection nozzle 19 flows smoothly to the tip in the main injection portion 191.
The seal portion 672 as the “second seal portion” of the sub-needle 22 is formed in a hemispherical shape having a spherical surface. The outer wall of the seal portion 672 is partially chamfered so that the fuel in the injection nozzle 19 flows smoothly to the tip in the sub-injection portion 192.

  In the fuel injection valve 8 according to the eighth embodiment, the outer walls of the seal portions 662 and 672 of the main needle 21 and the sub-needle 22 are spherical, so that the seal portions 662 and 672 can be connected to the main valve seat 195 and the needle even if the needle is inclined. It securely contacts the sub valve seat 196. This prevents the main nozzle holes 193 and 194 from opening and closing at an unintended timing. Therefore, in the eighth embodiment, in addition to the effects of the first embodiment, it is possible to prevent the occurrence of poor sealing in the main valve seat 195 and the sub valve seat 196.

(Ninth embodiment)
Next, the fuel injection valve by 9th Embodiment of this invention is demonstrated based on FIGS. The ninth embodiment differs from the first embodiment in the configuration of the time difference actuating means.

  FIG. 18 is a sectional view of the fuel injection valve 9 according to the ninth embodiment. The fuel injection valve 9 includes a “housing” main housing 75, an intermediate member 76 as a “communication path forming member”, a fuel introduction portion 77, a main needle 71 as a “first needle”, and a main spring as a “first spring”. 73, sub housing 78 as “housing”, sub needle 72 as “second needle”, sub spring 74 as “second spring”, movable core 79, fixed core 80, lid member 81, coil 82, “control” A connecting member 83 as a “passage forming member”. The fuel injection valve 9 is a fuel injection valve that directly injects fuel into a combustion chamber of an engine (not shown). The sub-housing 78 is provided in the vicinity of an ignition plug (not shown) of the engine as compared to the main housing 75. 18 to 20, the main valve seat 754 as the “first valve seat” of the main housing 75 and the sub valve seat 784 as the “second valve seat” of the sub housing 78 to the main needle 71 and the sub A valve opening direction in which the needle 72 is separated and a valve closing direction in which the main needle 71 and the sub needle 72 abut on the main valve seat 754 and the sub valve seat 784 are illustrated.

  The main housing 75 is formed in a bottomed cylindrical shape. The main housing 75 is provided with an intermediate member 76 on the side opposite to the portion corresponding to the bottom. A main injection hole 750 as a “first injection hole” that communicates the inside and the outside of the main housing 75 is formed in a portion corresponding to the bottom of the main housing 75. In the fuel injection valve 9 according to the ninth embodiment, two main injection holes 750 are formed. An annular main valve seat 754 is formed at the edge of the inner opening that is the opening on the inner side of the main housing 75 of the main injection hole 750.

  The main housing 75 has an accommodation space in which the main needle 71 can reciprocate. When the main needle 71 is accommodated in the accommodating space, a fuel chamber 751 in which fuel injected from the main injection hole 750 into the combustion chamber is formed on the main valve seat 754 side of the main large diameter portion 713 of the main needle 71. . The main housing 75 has a fuel supply passage 753 communicating with the fuel chamber 751 in the radially outward direction of the fuel chamber 751.

  The intermediate member 76 is a metal member provided between the main housing 75 and the fuel introduction portion 77. The intermediate member 76 is a fuel supply passage 761 communicating with the fuel supply passage 753 and a “first pressure chamber” formed on the opposite side of the main large-diameter portion 713 of the main needle 71 from the main valve seat 754 side. The communication passage 762 communicates with the main pressure chamber 752. The intermediate member 76 has a first throttle channel 765 having a smaller cross-sectional area than the cross-sectional area of the communication path 762 between the communication path 762 and the main pressure chamber 752.

The fuel introduction portion 77 is provided on the side opposite to the main housing 75 in the intermediate member 76. The fuel introduction part 77 has a fuel supply passage 771 communicating with the inside of an external fuel rail (not shown) on the central axis. The fuel supply passage 771 communicates with the communication passage 762. A groove 772 communicating with the fuel supply passage 771 is provided on the end surface on the intermediate member 76 side. The groove 772 serves as a fuel supply passage that connects the fuel supply passage 761 and the fuel supply passage 771 together with the end surface of the intermediate member 76 on the fuel introduction portion 77 side when the fuel introduction portion 77 and the intermediate member 76 are assembled. The fuel introduction part 77 supplies the fuel supplied from the fuel rail to the fuel chamber 751 and the main pressure chamber 752.
The main holder 773 is provided in the radially outward direction of the end of the main housing 75 on the intermediate member 76 side of the fuel introducing portion 77, the intermediate member 76, and the main holder 773 includes the fuel introducing portion 77, the intermediate member 76, and The positions of the main housings 75 are regulated so that the central axes of the main housings 75 overlap.

  The main needle 71 is accommodated in the main housing 75 so as to be able to reciprocate. The main needle 71 is subjected to a quenching process so as to have a predetermined hardness. The hardness of the main needle 71 is set substantially equal to the hardness of the main housing 75. The main needle 71 is formed of a main shaft portion 711, a main seal portion 712, a main large diameter portion 713, and the like. The main shaft portion 711, the main seal portion 712, and the main large diameter portion 713 are integrally formed.

The main shaft portion 711 is formed in a rod shape.
The main seal portion 712 is provided at the end of the main shaft portion 711 on the main valve seat 754 side, and can contact the main valve seat 754. The main needle 71 opens and closes the main injection hole 750 when the main seal portion 712 is separated from the main valve seat 754 or comes into contact with the main valve seat 754, and communicates or blocks the fuel chamber 751 from the outside.

  The main large diameter portion 713 is provided on the opposite side of the main shaft portion 711 from the main seal portion 712. The main large diameter portion 713 is formed so that its outer diameter is larger than the outer diameter of the main shaft portion 711. A main spring 73 is in contact with the side of the main large diameter portion 713 opposite to the side where the main shaft portion 711 is joined.

  The main spring 73 is accommodated in the main pressure chamber 752. The main spring 73 is provided so that one end of the main spring 73 comes into contact with a spring contact surface 714 of a main pressure chamber forming member 715 provided on the side opposite to the side where the main shaft portion 711 of the main large diameter portion 713 is joined. The other end of the main spring 73 is in contact with a spring contact surface 764 of a main pressure chamber forming member 766 provided on the main valve seat 754 side of the intermediate member 76. The main spring 73 has a force that extends in the direction of the central axis C <b> 1 of the main housing 75. Accordingly, the main spring 73 biases the main needle 71 in the direction of the main valve seat 754, that is, in the valve closing direction.

  The main pressure chamber 752 is formed between the main needle 71 and the intermediate member 76. Specifically, the main pressure chamber 752 is provided in a radially outward direction of the spring contact surface 764 of the main pressure chamber forming member 715, the spring contact surface 714 of the main pressure chamber forming member 766, and the main spring 73. The inner wall 756 of the main pressure chamber forming member 755 is formed. In the ninth embodiment, the main pressure chamber forming member 715 is formed integrally with the main needle 71, the main pressure chamber forming member 766 is formed integrally with the intermediate member 76, and the main pressure chamber forming member 755 is integrated with the main housing 75. Is formed. 18 to 20, the main pressure chamber forming members 715, 766, and 755 are indicated by a virtual line VL1 for convenience. The volume of the main pressure chamber 752 can be changed by the reciprocating movement of the main needle 71. The main pressure chamber forming members 715, 766, and 755 correspond to “first pressure chamber forming members” recited in the claims.

  The sub housing 78 is formed in a bottomed cylindrical shape. The sub housing 78 is provided with a coil 82 and a sub holder 811 on the side opposite to the portion corresponding to the bottom. A sub injection hole 780 serving as a “second injection hole” that communicates the inside and the outside of the sub housing 78 is formed at a portion corresponding to the bottom of the sub housing 78. In the fuel injection valve 9 according to the ninth embodiment, one sub injection hole 780 is formed. The sub injection hole 780 is formed at a position where the distance to the ignition plug of the engine is shorter than the distance between the main injection hole 750 and the ignition plug. The sub injection hole 780 is formed so that the cross-sectional area is smaller than the total cross-sectional area of the main injection hole 750. An annular sub-valve seat 784 is formed at the edge of the inner opening that is the opening on the inner side of the sub-housing 78 of the sub-injection hole 780. The sub valve seat 784 is formed such that the seat diameter of the sub valve seat 784 and the sub needle 72 is smaller than the seat diameter of the main valve seat 754 and the main needle 71.

  The sub-housing 78 has an accommodating space in which the sub-needle 72 and the movable core 79 can reciprocate. A needle guide 786 for guiding the reciprocating movement of the sub needle 72 is provided on the sub valve seat 784 side of the housing space.

  The sub needle 72 is accommodated in the sub housing 78 so as to be able to reciprocate. The sub-needle 72 is subjected to a quenching process so as to have a predetermined hardness. The hardness of the sub needle 72 is set substantially equal to the hardness of the sub housing 78. The sub needle 72 is formed of a sub shaft portion 721 as a “second shaft portion”, a sub seal portion 722 as a “second seal portion”, a sub large diameter portion 723 as a “second large diameter portion”, and the like. ing. The sub shaft portion 721, the sub seal portion 722, and the sub large diameter portion 723 are integrally formed.

The sub shaft portion 721 is formed in a rod shape. The sub shaft portion 721 is inserted into a through hole 791 provided in the movable core 79 and a through hole 787 provided in the needle guide 786.
The sub seal portion 722 is provided at the end of the sub shaft portion 721 on the sub valve seat 784 side, and can contact the sub valve seat 784. The sub needle 72 opens or closes the sub injection hole 780 when the sub seal portion 722 is separated from the sub valve seat 784 or abuts on the sub valve seat 784, and communicates or blocks the inside and the outside of the sub housing 78.

  The sub large diameter portion 723 is provided on the opposite side of the sub shaft portion 721 from the sub seal portion 722. The sub large-diameter portion 723 is formed so that the outer diameter thereof is larger than the outer diameter of the sub-shaft portion 721, and is located on the side opposite to the sub-valve seat 784 side of the movable core 79. A sub spring 74 is in contact with the sub large diameter portion 723 on the side opposite to the sub valve seat 784 side.

  One end of the sub spring 74 is in contact with the sub large diameter portion 723. The other end of the sub spring 74 is in contact with the end surface of the lid member 81 on the sub valve seat 784 side. The sub spring 74 has a force that extends in the direction of the central axis C <b> 2 of the sub housing 78. Thereby, the subspring 74 urges the subneedle 72 in the direction of the subvalve seat 784, that is, the valve closing direction.

  The valve opening spring 741 is accommodated in a sub pressure chamber 782 as a “second pressure chamber” formed on the sub valve seat 784 side of the sub large diameter portion 723. One end of the valve-opening spring 741 is provided in contact with a spring contact surface 793 of a sub pressure chamber forming member 794 provided on the sub valve seat 784 side of the movable core 79. The other end of the valve opening spring 741 is in contact with a spring contact surface 785 of a sub pressure chamber forming member 789 provided in the sub housing 78. The valve-opening spring 741 has a force that extends in the direction of the central axis C <b> 2 of the sub-housing 78. As a result, the valve opening spring 741 biases the sub needle 72 away from the sub valve seat 784, that is, in the valve opening direction.

  The valve-opening spring 741 is formed so that its urging force is smaller than that of the sub-spring 74. Accordingly, when the fuel is not supplied to the inside of the sub housing 78 and the power is not supplied to the coil 82, the sub needle 72 contacts the sub valve seat 784.

The movable core 79 is formed in a substantially cylindrical shape with a magnetic material such as ferritic stainless steel, for example, and the surface is plated with, for example, chrome. The movable core 79 is subjected to a magnetic stabilization process. The movable core 79 is in contact with the end surface 724 of the sub large diameter portion 723 of the sub needle 72 on the sub valve seat 784 side. The movable core 79 reciprocates integrally with the sub-needle 72 according to the magnitude of the electromagnetic attractive force generated between the movable core 79 and the fixed core 80.
The movable core 79 has a through hole 791 through which the sub shaft portion 721 of the sub needle 72 is inserted, and a communication path 792 through which fuel in the sub pressure chamber 782 can flow to the fixed core 80 side of the movable core 79. Is formed. The communication passage 792 makes the fuel pressure on the sub-valve seat 784 side of the movable core 79 the same as the fuel pressure on the fixed core 80 side.

  The fixed core 80 is formed in a cylindrical shape from a magnetic material such as ferritic stainless steel. The fixed core 80 is subjected to a magnetic stabilization process. The hardness of the fixed core 80 is substantially equal to the hardness of the movable core 79, but in order to ensure the function as a stopper of the movable core 79, for example, chrome plating is applied to the surface to ensure the necessary hardness. The fixed core 80 is joined to the sub housing 78 and is fixed to the inside of the sub housing 78. A sub-spring 74 and a lid member 81 are accommodated in a columnar space formed substantially at the center of the fixed core 80.

  The coil 82 is formed in a substantially cylindrical shape, and is provided between the sub housing 78 and the sub holder 811. The coil 82 generates a magnetic force when electric power is supplied. When a magnetic force is generated in the coil 82, a magnetic circuit is formed in the fixed core 80, the movable core 79, the sub housing 78, and the sub holder 811. Thereby, a magnetic attractive force is generated between the fixed core 80 and the movable core 79, and the movable core 79 is attracted to the fixed core 80.

  The sub pressure chamber 782 is formed between the movable core 79 and the sub housing 78. Specifically, the sub pressure chamber 782 includes a spring contact surface 793 included in the sub pressure chamber forming member 794, a spring contact surface 785 included in the sub pressure chamber forming member 789, and a radially outward direction of the valve opening spring 741. And the inner wall 788 of the sub pressure chamber forming member 781 located at the same position. In the ninth embodiment, the sub pressure chamber forming member 794 is formed integrally with the movable core 79, and the sub pressure chamber forming members 781, 789 are formed integrally with the sub housing 78. 18 to 20, the sub pressure chamber forming members 781, 789, and 794 are indicated by a virtual line VL2 for convenience. The sub pressure chamber 782 can be changed in volume by the reciprocating movement of the movable core 79. The sub pressure chamber forming members 781, 789, and 794 correspond to “second pressure chamber forming members” recited in the claims.

  The connecting member 83 is provided between the main housing 75 and the sub housing 78. The connecting member 83 forms a control passage 831 that connects the main pressure chamber 752 and the sub pressure chamber 782. A second throttle channel 832 having a smaller cross-sectional area than the cross-sectional area of the control channel 831 is formed at a site where the control channel 831 is connected to the main pressure chamber 752.

  Next, the operation of the fuel injection valve 9 according to the ninth embodiment will be described.

When power is not supplied to the coil 82, a part of the fuel supplied from the fuel supply passage 771 is communicated with the communication passage 762, the first throttle passage 765, the main pressure chamber 752, the second throttle passage, and the control passage. 831 and supplied to the sub pressure chamber 782. Further, fuel excluding fuel supplied to the main pressure chamber 752 and the sub pressure chamber 782 is supplied to the fuel chamber 751 through the groove 772 and the fuel supply passages 761 and 753. At this time, the fuel pressures in the main pressure chamber 752, the sub pressure chamber 782, and the fuel chamber 751 are all the same.
In the main housing 75, the main needle 71 is in contact with the main valve seat 754 by a balance between the biasing force of the main spring 73 and the pressure of the fuel acting on the main needle 71. In the sub housing 78, the sub needle 72 abuts on the sub valve seat 784 by a balance between the urging force of the valve opening spring 741, the urging force of the sub spring 74, and the pressure of the fuel acting on the sub needle 72. Yes. Thereby, the main nozzle holes 750 and 780 are closed.

Here, “the pressure of the fuel acting on the main needle 71” refers to the fuel pressure in the fuel chamber 751 and the fuel pressure in the main pressure chamber 752. The acting force that the pressure of the fuel in the fuel chamber 751 acts on the main needle 71 is the fuel in the fuel chamber 751 in an area obtained by removing the seat area of the main seal portion 712 and the main valve seat 754 from the cross-sectional area of the main large diameter portion 713. And the main needle 71 acts in a direction away from the main valve seat 754. The acting force that the pressure of the fuel in the main pressure chamber 752 acts on the main needle 71 is a value obtained by multiplying the cross-sectional area of the main large diameter portion 713 by the pressure of the fuel in the main pressure chamber 752. Acts in a direction to contact the main valve seat 754.
The “pressure of fuel acting on the sub needle 72” is the pressure of fuel in the sub pressure chamber 782. The acting force that the pressure of the fuel in the sub-pressure chamber 782 acts on the sub-needle 72 is such that the fuel pressure in the sub-pressure chamber 782 is reduced to the area obtained by subtracting the cross-sectional areas of the through hole 791 and the communication passage 792 from the cross-sectional area of the movable core 79. This is a multiplied value, and acts in the direction of separating the sub needle 72 from the sub valve seat 784.

  When power is supplied to the coil 82, an electromagnetic attractive force is generated between the fixed core 80 and the movable core 79. When the movable core 79 moves in the direction of the fixed core 80 by the electromagnetic attraction force, the sub-needle 72 that is in contact with the movable core 79 at the end surface 724 moves in the direction of the white arrow D4 as shown in FIG. . When the sub needle 72 moves in the direction of the white arrow D4, the sub seal portion 722 is separated from the sub valve seat 784, and the sub injection hole 780 is opened. Thereby, the fuel in the sub housing 78 is injected from the sub injection hole 780 into the combustion chamber.

  When the fuel in the sub housing 78 is injected from the sub injection hole 780, the fuel pressure in the sub pressure chamber 782 decreases. As a result, the fuel in the main pressure chamber 752 flows into the sub pressure chamber 782 through the second throttle channel 832 and the control passage 831. At this time, since the second throttle channel 832 is provided between the main pressure chamber 752 and the sub pressure chamber 782, the fuel in the main pressure chamber 752 does not flow into the sub pressure chamber 782 abruptly.

  When the fuel in the main pressure chamber 752 flows into the sub pressure chamber 782, the pressure of the fuel in the main pressure chamber 752 decreases. At this time, since the first throttle passage 765 is provided between the main pressure chamber 752 and the fuel supply passage 771, the fuel in the fuel supply passage 771 does not flow into the main pressure chamber 752 suddenly. When the fuel pressure in the main pressure chamber 752 decreases due to the fuel flow into the sub pressure chamber 782, the balance between the biasing force of the main spring 73 and the pressure of the fuel acting on the main needle 71 is lost, and the main needle 71 As shown at 20, it moves in the direction of the white arrow D5. When the main needle 71 moves in the direction of the white arrow D5, the main seal portion 712 is separated from the main valve seat 754, and the main injection hole 750 is opened. Thus, after a certain amount of time has elapsed from the start of fuel injection from the sub injection holes 780, the fuel in the fuel chamber 751 is injected from the main injection holes 750 into the combustion chamber.

  The fuel injection valve 9 according to the ninth embodiment includes a set of a movable core 79, a fixed core 80, and a coil 82 that constitute an operation circuit that operates the sub-needle 72. When the sub needle 72 is operated by the operation circuit, the main needle 71 is operated by the pressure change in the sub pressure chamber 782. Thereby, the main injection holes 750 and 780 can be opened with a time difference between the main needle 71 and the sub needle 72. Therefore, 9th Embodiment has the same effect as 1st Embodiment.

  Further, in the fuel injection valve 9, the sub housing 78 is provided in the vicinity of the spark plug of the engine as compared with the main housing 75. As a result, fuel can be injected through the main injection holes 750 so as to diffuse throughout the combustion chamber after the fuel is injected into the vicinity of the spark plug through the sub injection holes 780 having a relatively small cross-sectional area. Therefore, fuel can be injected into the combustion chamber in consideration of the combustion efficiency in the combustion chamber, and the combustion efficiency can be further improved.

(10th Embodiment)
Next, a fuel injection valve according to a tenth embodiment of the present invention will be described with reference to FIGS. The tenth embodiment differs from the ninth embodiment in the shape of the housing that houses the main needle and the sub-needle.

  FIG. 21 is a sectional view of the fuel injection valve 10 according to the tenth embodiment. The fuel injection valve 10 includes a housing 85, an intermediate member 86, a lid member 88 as a "fixed core", a main needle 91 as a "first needle", a main spring 93 as a "first spring", and a "second needle". A sub-needle 92 as a "second spring", a sub-spring 94 as a "second spring", a coil 95, and the like. 21 to 23, the main needle 91 and the sub needle 92 are separated from the main valve seat 851 as the “first valve seat” and the sub valve seat 852 as the “second valve seat” of the housing 85. The valve opening direction, and the valve closing direction, which is the direction in which the main needle 91 and the sub needle 92 abut on the main valve seat 851 and the sub valve seat 852, are illustrated.

  The housing 85 is formed in a bottomed cylindrical shape. The housing 85 is provided with an intermediate member 86 on the side opposite to the portion corresponding to the bottom. The housing 85 is formed with two columnar accommodation spaces adjacent to each other. Of the two accommodation spaces, the main needle 91 is accommodated in one accommodation space 853 so as to be capable of reciprocating. The sub-needle 92 is accommodated in the other accommodating space 854 so as to be capable of reciprocating.

A main injection hole 855 as a “first injection hole” that connects the storage space 853 and the outside is formed at a portion corresponding to the bottom of the storage space 853. In the fuel injection valve 10 according to the tenth embodiment, two main injection holes 855 are formed. An annular main valve seat 851 is formed at the edge of the inner opening which is the opening on the inner side of the housing 85 of the main injection hole 855.
When the main needle 91 is accommodated in the accommodating space 853, a fuel chamber 841 through which fuel injected from the main injection hole 855 into the combustion chamber is formed on the main valve seat 851 side of the main large diameter portion 913 of the main needle 91. The The housing 85 has a fuel supply passage 859 that can communicate with the fuel chamber 841 in the radially outward direction of the fuel chamber 841.

  A sub-injection hole 856 as a “second injection hole” that connects the accommodation space 854 and the outside is formed in a portion corresponding to the bottom of the accommodation space 854. In the fuel injection valve 10 according to the tenth embodiment, one sub injection hole 856 is formed. The sub injection hole 856 is provided in the vicinity of the ignition plug as compared with the main injection hole 855 and is formed so that the cross-sectional area is smaller than the total cross-sectional area of the main injection hole 855. An annular main valve seat 852 is formed at the edge of the inner opening which is the opening on the inner side of the housing 85 of the sub injection hole 856. The sub valve seat 852 is formed such that the seat diameter of the sub valve seat 852 and the sub needle 92 is smaller than the seat diameter of the main valve seat 851 and the main needle 91. A needle guide 844 that guides the reciprocating movement of the sub needle 92 is provided on the sub valve seat 852 side of the housing space 854.

  Further, on the intermediate member 86 side of the housing 85, a first groove forming member 846 as a “communication path forming member” that forms a first groove 842 as a “communication path” communicating with the fuel supply path 859, and housing A second groove forming member 847 that forms a second groove 843 as a “control passage forming member” communicating with the space 854 is provided. The first groove 842 is a first throttle channel together with an end face 861 of a channel / pressure chamber forming member 866 as a “communication channel forming member” and a “control channel forming member” provided on the housing 85 side of the intermediate member 86. 864 is formed. The second groove 843 forms a second throttle channel 865 as a “control passage” together with the end face 861.

  The intermediate member 86 is a metal member provided between the housing 85 and the lid member 88. The intermediate member 86 has a through hole 862 and a fuel supply passage 863. The through hole 862 communicates with the accommodation space 854, and the sub needle 92 is inserted therethrough. The fuel supply passage 863 is formed at a position different from the through hole 862 and communicates with the fuel supply passage 859.

The lid member 88 is provided on the opposite side of the housing 85 in the intermediate member 86. The lid member 88 is subjected to a magnetic stabilization process. The lid member 88 has a fuel supply passage 881 that communicates with the fuel supply passage 863. The lid member 88 accommodates therein an accommodation space forming member 883 that forms an accommodation space 882 that can accommodate the sub large-diameter portion 923 and the sub spring guide portion 924 of the sub needle 92. The storage space 882 is partitioned into a sub pressure chamber 850 which is a side communicating with the storage space 854 and a side where the sub spring 94 is stored by the sub large diameter portion 923 included in the sub needle 92. A coil 95 is housed around the housing space 882 on the side where the sub spring 94 is housed.
The lid member 88 is connected to an external fuel rail (not shown). The lid member 88 supplies part of the fuel supplied by the fuel rail to the fuel chamber 960 and the like.

  The holder 90 is provided in the radially outward direction of a part of the lid member 88, the intermediate member 86, and the housing 85. The holder 90 regulates the positions of the lid member 88, the intermediate member 86, and the housing 85 so that the central axes thereof overlap each other.

  The main needle 91 is accommodated in the accommodation space 853 so as to be capable of reciprocating. The main needle 91 is quenched to have a predetermined hardness. The hardness of the main needle 91 is set substantially equal to the hardness of the housing 85. The main needle 91 is formed of a main shaft portion 911, a main seal portion 912, a main large diameter portion 913, and the like. The main shaft portion 911, the main seal portion 912, and the main large diameter portion 913 are integrally formed.

The main shaft portion 911 is formed in a rod shape.
The main seal portion 912 is provided at the end of the main shaft portion 911 on the main valve seat 851 side, and can contact the main valve seat 851. The main needle 91 opens and closes the main injection hole 855 when the main seal portion 912 is separated from the main valve seat 851 or comes into contact with the main valve seat 851 to communicate or block the fuel chamber 841 from the outside.

  The main large-diameter portion 913 is provided on the opposite side of the main shaft portion 911 from the main seal portion 912. The main large diameter portion 913 is formed so that its outer diameter is larger than the outer diameter of the main shaft portion 911. The main large diameter portion 913 is in contact with the main spring 93 on the side opposite to the main valve seat 851 side.

  The main spring 93 is accommodated in a main pressure chamber 840 as a “first pressure chamber” communicating with the first throttle channel 864 and the second throttle channel 865. The main spring 93 is provided so that one end of the main spring 93 comes into contact with a spring contact surface 915 of a main pressure chamber forming member 916 provided on the side opposite to the side where the main shaft portion 911 of the main large diameter portion 913 is joined. Yes. The other end of the main spring 93 is in contact with an end face 861 of a flow path / pressure chamber forming member 866 provided on the housing 85 side of the intermediate member 86. The main spring 93 has a force that extends in the direction of the central axis C <b> 3 of the housing 85. Accordingly, the main spring 93 biases the main needle 91 in the direction of the main valve seat 851, that is, the valve closing direction.

  The main pressure chamber 840 is formed between the main needle 91 and the intermediate member 86. Specifically, the main pressure chamber 840 is positioned in the radially outward direction of the spring contact surface 915 included in the main pressure chamber forming member 916, the end surface 861 included in the flow path / pressure chamber forming member 866, and the main spring 93. The inner wall 849 of the main pressure chamber forming member 848 is formed. In the tenth embodiment, the main pressure chamber forming member 916 is formed integrally with the main needle 91, the flow path / pressure chamber forming member 866 is formed integrally with the intermediate member 86, and the main pressure chamber forming member 848 is formed with the housing 85. It is integrally formed. 21 to 23, the main pressure chamber forming members 848 and 916 and the flow path / pressure chamber forming member 866 are indicated by a virtual line VL3 for convenience. The volume of the main pressure chamber 840 can be changed by the reciprocating movement of the main needle 91. The main pressure chamber forming members 848 and 916 and the flow path / pressure chamber forming member 866 correspond to the “first pressure chamber forming member” recited in the claims.

  The subneedle 92 is accommodated in the accommodating spaces 854 and 882 and the through hole 862 so as to be reciprocally movable. The sub-needle 92 is quenched to have a predetermined hardness. The hardness of the sub-needle 92 is set substantially equal to the hardness of the housing 85. The sub needle 92 includes a sub shaft portion 921 as a “second shaft portion”, a sub seal portion 922 as a “second seal portion”, a sub large diameter portion 923 as a “second large diameter portion”, and the like. ing. The sub shaft portion 921, the sub seal portion 922, and the sub large diameter portion 923 are integrally formed.

The sub shaft portion 921 is formed in a rod shape. The sub shaft portion 921 is inserted through a through hole 845 provided in the needle guide 844. A portion of the sub shaft portion 921 inserted through the through hole 845 is partially chamfered so that the fuel flows smoothly.
The sub seal portion 922 is provided at the end of the sub shaft portion 921 on the sub valve seat 852 side, and can contact the sub valve seat 852. The sub-needle 92 opens and closes the sub-injection hole 856 when the sub-seal portion 922 is separated from the sub-valve seat 852 or abuts against the sub-valve seat 852, and communicates or blocks the housing space 854 and the outside.

  The sub large diameter portion 923 is provided on the side opposite to the sub seal portion 922 of the sub shaft portion 921. The sub large diameter portion 923 is formed so that the outer diameter thereof is larger than the outer diameter of the sub shaft portion 921. The sub large diameter portion 923 is subjected to a magnetic stabilization process. A sub spring 94 is in contact with the sub large diameter portion 923 on the side opposite to the sub valve seat 852 side.

  The sub spring 94 is provided so that one end thereof abuts on a spring abutting surface 925 that is provided on the opposite side of the sub large diameter portion 923 from the side to be joined to the sub shaft portion 921. The other end of the subspring 94 is in contact with the inner wall of the lid member 88 that forms the accommodation space 882. The subspring 94 has a force that extends in the direction of the central axis C <b> 3 of the housing 85. Thereby, the sub spring 94 urges the sub needle 92 in the direction of the sub valve seat 852, that is, the valve closing direction.

  The coil 95 is formed in a substantially cylindrical shape. The coil 95 generates a magnetic force when electric power is supplied. When a magnetic force is generated in the coil 95, a magnetic circuit is formed between the lid member 88 and the sub needle 92. As a result, a magnetic attractive force is generated between the lid member 88 and the sub needle 92, and the sub needle 92 is attracted to the lid member 88.

  The sub pressure chamber 850 is formed between the sub needle 92 and the intermediate member 86. Specifically, the sub pressure chamber 850 includes an end surface 927 of a sub pressure chamber forming member 926 provided on the sub valve seat 852 side of the sub large diameter portion 923, and a sub pressure chamber provided on the sub spring 94 side of the intermediate member 86. The forming member 867 is formed of an end surface 868 and an inner wall 884 of a part of the accommodation space forming member 883. In the tenth embodiment, the sub pressure chamber forming member 926 is formed integrally with the sub needle 92, the sub pressure chamber forming member 867 is formed integrally with the intermediate member 86, and the sub pressure chamber forming member 883 is integrated with the lid member 88. Is formed. 21 to 23, the sub pressure chamber forming members 867, 883, and 926 are indicated by a virtual line VL4 for convenience. The volume of the sub pressure chamber 850 can be changed by the reciprocating movement of the sub needle 92. The sub pressure chamber forming members 867, 883, and 926 correspond to “second pressure chamber forming members” recited in the claims.

  Next, the operation of the fuel injection valve 10 according to the tenth embodiment will be described.

When power is not supplied to the coil 95, some of the fuel supplied from the fuel supply passages 881 and 863 is part of the first throttle channel 864, the main pressure chamber 840, the second throttle channel 865, and the sub pressure chamber 850. Etc. are supplied. Further, the fuel excluding the fuel supplied to the main pressure chamber 840 and the sub pressure chamber 850 is supplied to the fuel chamber 841 through the fuel supply passage 859. At this time, the fuel pressures in the main pressure chamber 840, the sub pressure chamber 850, and the fuel chamber 841 are all the same.
In the housing 85, the main needle 91 is in contact with the main valve seat 851 by a balance between the urging force of the main spring 93 and the pressure of fuel acting on the main needle 91. Further, the sub needle 92 is in contact with the sub valve seat 852 by a balance between the biasing force of the sub spring 94 and the pressure of the fuel acting on the sub needle 92. Thereby, the main nozzle holes 855 and 856 are closed.

Here, “the pressure of the fuel acting on the main needle 91” refers to the fuel pressure in the fuel chamber 841 and the fuel pressure in the main pressure chamber 840. The acting force that the pressure of the fuel in the fuel chamber 841 acts on the main needle 91 is the fuel in the fuel chamber 851 in an area obtained by removing the seat area of the main seal portion 912 and the main valve seat 851 from the cross-sectional area of the main large diameter portion 913. And the main needle 91 acts in a direction away from the main valve seat 851. The acting force that the pressure of the fuel in the main pressure chamber 840 acts on the main needle 91 is a value obtained by multiplying the cross-sectional area of the main large diameter portion 913 by the pressure of the fuel in the main pressure chamber 840, and Acts in a direction to contact the main valve seat 851.
The “pressure of fuel acting on the sub needle 92” is the pressure of fuel in the sub pressure chamber 850. The acting force that the pressure of the fuel in the sub pressure chamber 850 acts on the sub needle 92 is obtained by multiplying the area obtained by subtracting the cross sectional area of the sub shaft portion 921 from the cross sectional area of the sub large diameter portion 923 by the fuel pressure in the sub pressure chamber 850. The combined value acts in the direction in which the sub needle 92 is separated from the sub valve seat 852.

  When electric power is supplied to the coil 95, an electromagnetic attractive force is generated between the sub needle 92 and the lid member 88. When the sub needle 92 is moved in the direction of the white arrow D6 by the electromagnetic attraction force as shown in FIG. 22, the sub seal portion 922 is separated from the sub valve seat 852 and the sub injection hole 856 is opened. Thereby, the fuel in the accommodation space 854 is injected from the sub injection hole 856 into the combustion chamber.

  When fuel in the accommodation space 854 is injected from the sub injection hole 856, the fuel pressure in the sub pressure chamber 850 communicating with the accommodation space 854 decreases. As a result, the fuel in the main pressure chamber 840 flows into the accommodation space 854 and the sub pressure chamber 782 through the second throttle channel 865. At this time, since the second throttle channel 865 is provided between the main pressure chamber 840 and the sub pressure chamber 850, the fuel in the main pressure chamber 840 does not flow into the sub pressure chamber 850 abruptly.

  When the fuel in the main pressure chamber 840 flows into the sub pressure chamber 850, the fuel pressure in the main pressure chamber 840 decreases. At this time, since the first throttle channel 864 is provided between the main pressure chamber 840 and the fuel supply passage 859, the fuel in the fuel supply passage 859 does not flow into the main pressure chamber 840 abruptly. When the fuel pressure in the main pressure chamber 840 decreases due to the flow of fuel into the sub pressure chamber 850, the balance between the biasing force of the main spring 93 and the pressure of the fuel acting on the main needle 91 is lost, and the main needle 91 is As shown in FIG. 23, it moves in the direction of a white arrow D7. When the main needle 91 moves in the direction of the white arrow D7, the main seal portion 912 is separated from the main valve seat 851, and the main injection hole 855 is opened. Thus, after a certain amount of time has elapsed from the start of fuel injection from the sub injection hole 856, the fuel in the fuel chamber 841 is injected from the main injection hole 855 into the combustion chamber.

  The fuel injection valve 10 according to the tenth embodiment has one coil 95 that constitutes an operating circuit that operates the sub-needle 92. The main needle 91 is operated by the pressure change of the sub pressure chamber 850 when the sub needle 92 is operated by the operation circuit. Thereby, the main injection holes 855 and 856 can be opened with a time difference between the main needle 91 and the sub needle 92. Therefore, 10th Embodiment has the same effect as 1st Embodiment.

(Other embodiments)
(A) In the above-described embodiment, the “first needle” is a main needle that opens and closes a nozzle hole for injecting a relatively large amount of fuel, and the “second needle” is an opening and closing of a nozzle hole for injecting a relatively small amount of fuel. The sub needle was used. However. The relationship between the needle that previously opens and closes the nozzle hole and the fuel injection amount is not limited to this. The sub needle that opens the nozzle hole first may inject a large amount of fuel, and the main needle that opens the nozzle hole later may inject a small amount of fuel. At this time, the sectional area of the nozzle hole opened and closed by the sub needle may be larger than the sectional area of the nozzle hole opened and closed by the main needle.

  (A) In the above-described embodiment, the sub needle is opened and closed first by the electromagnetic attraction force by the magnetic circuit formed inside the housing, and then the main needle is opened and closed. However, the main needle need not be opened and closed. Only the sub-needle may be operated by controlling the time during which the electromagnetic attractive force is generated. In this case, the fuel is injected only from the injection hole opened and closed by the sub-needle.

  (C) In the above-described embodiment, the sub shaft portion of the sub needle is inserted into the through hole of the needle guide, and the sub needle is guided to reciprocate. However, the needle guiding method including the main needle is not limited to this. A chamfered sleeve may be provided on the shaft portion of the needle. Thereby, a gap is formed between the chamfered portion and the inner wall of the housing, and the fuel can flow smoothly.

  (D) In the second, third, fourth, and fifth embodiments, the end surface of the inclined plate on the fixed core side has an inclined surface formed at the edge of the main through hole. However, as in the first, sixth, eighth, and ninth embodiments, it may have an inclined surface formed at the edge of the sub through hole.

  (E) In the ninth and tenth embodiments, the main pressure chamber forming member forming the main pressure chamber is formed integrally with the main needle, the intermediate member, and the like. Further, the sub pressure chamber forming member forming the sub pressure chamber is formed integrally with the movable core, the lid member, and the like. However, the main pressure chamber forming member and the sub pressure chamber forming member may not be formed integrally with them.

  (F) In the ninth and tenth embodiments, the control passage communicates with the second throttle channel or is formed as the second throttle channel. However, the control passage may not have the second throttle channel.

  (G) In the ninth embodiment, the sub-housing is provided closer to the spark plug than the main housing. However, the position where the sub-housing is provided is not limited to this.

  (H) In the above-described embodiment, one or two nozzle holes are opened and closed by the main needle, and one nozzle hole is opened and closed by the sub needle. However, the number of nozzle holes is not limited to this. There may be more than two each.

  As mentioned above, this invention is not limited to such embodiment, It can implement with a various form in the range which does not deviate from the summary.

1, 6, 7, 8, 9, 10, ... fuel injection valve,
15, 85... Housing,
193, 194, 750, 780, 855, 856 ... nozzle hole,
195, 196, 754, 784, 851, 852 ... valve seats,
20, 40, 45, 50, 55... Inclined plate (time difference operating means, regulating member),
21, 71, 91 ... main needle (first needle),
22, 72, 92 ... sub needle (second needle),
24, 44 ・ ・ ・ Regulating member (time difference actuating means),
27, 73, 93 ... main spring (first spring),
28, 74, 94 ... sub-spring (second spring),
31, 79... Movable core,
33, 80 ... fixed core,
35, 82, 95 ... coils,
450, 500 ・ ・ ・ Regulator (time difference actuating means),
550... Part (time difference actuating means),
75 ・ ・ ・ Main housing (housing),
78 ・ ・ ・ Sub housing (housing),
88 ... Lid member (fixed core).

Claims (16)

A plurality of injection holes (193, 194, 750, 780, 855, 856) that are formed at one end in the central axis direction and inject fuel, and a plurality of valve seats (195, 196, formed around the injection holes) 754, 784, 851, 852) and (15, 75, 78, 85);
The first nozzle holes of the plurality of nozzle holes are accommodated in the housing so as to be able to reciprocate in the central axis direction of the housing and are separated or abutted against the first valve seats (195, 754, 851) of the plurality of valve seats. First needles (21, 71, 91) for opening and closing (193, 750, 855);
A first spring (27, 73, 93) for urging the first needle to abut against the first valve seat;
A plurality of valve seats which are accommodated in the housing so as to be reciprocally movable in the central axis direction of the housing and are separated from or abutted with second valve seats (196, 784, 852) different from the first valve seats of the plurality of valve seats. A second needle (22, 72, 92) for opening and closing a second nozzle hole (194, 780, 856) different from the first nozzle hole of the nozzle hole;
A second spring (28, 74, 94) for urging the second needle to abut against the second valve seat;
Coils (35, 82, 95) that generate magnetic fields when energized;
A fixed core (33, 80, 88) fixed in a magnetic field generated by the coil in the housing;
Provided on the valve seat side of the fixed core so as to be able to reciprocate in the direction of the central axis of the housing, and when the coil is energized, it is sucked in the direction of the fixed core and the second needle is separated from the second valve seat. Movable cores (31, 79) to be
Time difference actuating means (20, 24, 40, 44, 45, 450, 450) capable of separating the first needle from the first valve seat with a time difference after the second needle is separated from the second valve seat. 50, 500, 55, 550, 715, 755, 76, 766, 781, 789, 794, 83, 843, 846, 866, 848, 866, 867, 883, 916, 926),
A fuel injection valve (1, 6, 7, 8, 9, 10). The time difference actuating means is
It has a first through hole (201, 401, 451, 501, 551) through which the first needle is inserted and a second through hole (202, 402, 452, 502, 552) through which the second needle is inserted. The end face opposite to the first valve seat and the second valve seat is the end face (216) of the first needle on the first valve seat side and the end face of the second needle on the second valve seat side ( 226) abutting members (20, 40, 45, 50, 55),
Provided between the movable core and the contact member and in the vicinity of the second through hole as compared with the first through hole, and formed on the end surface (313) of the movable core on the contact member side. Part of at least one of the core recess (314, 414, 464, 514, 564) and the contact member recess (204, 404) formed on the end surface (203, 403) of the contact member on the movable core side. A regulating member that is accommodated and regulates the distance between the end surface on the movable core side of the abutting member and the end surface on the abutting member side of the movable core in the vicinity of the second through hole to be a predetermined distance. (24, 44, 450, 500, 550),
Have
The first spring is formed such that a biasing force is larger than a biasing force of the second spring,
When the movable core is sucked by the fixed core, the contact member is configured such that an end surface on the movable core side of the contact member and an end surface on the contact member side of the movable core in the vicinity of the second through hole. Inclining so that the portion on which the first through hole is formed is in contact with the movable core while keeping the distance between
2. The second needle is separated from the second valve seat when the portion of the contact member where the second through hole is formed is inclined so as to be separated from the movable core. The fuel injection valve as described.   The first seat diameter with which the first needle and the first valve seat abut is larger than the second seat diameter with which the second needle and the second valve seat abut. Fuel injection valve.   The fuel injection valve according to claim 2 or 3, wherein the restricting member (24) is formed in a spherical shape. The regulating member (44) is formed in a columnar shape,
The restricting member is provided on at least one of the core recess and the contact member recess so that an inner wall forming the core recess and the contact member recess and a curved side surface (442) of the restricting member contact each other. The fuel injection valve according to claim 2, wherein the portion is accommodated.   The fuel injection valve according to claim 2, wherein the restriction member is formed integrally with the contact member.   The fuel injection valve according to claim 6, wherein the restricting member is a projecting portion (550) formed by an inclined surface (553, 554) on the movable core side of the contact member.   The abutting member is inclined in the direction of the first valve seat from the radially outer side of the abutting member toward the center of the abutting member at an edge of the first through hole on the fixed core side. The fuel injection valve according to any one of claims 2 to 7, wherein an inclined surface (206, 406, 456, 506, 556) is formed.   The abutting member is inclined in the direction of the second valve seat from the center of the abutting member toward the radially outer side of the abutting member at the edge of the second through hole on the fixed core side. The fuel injection valve according to any one of claims 2 to 8, wherein an inclined surface (207) is formed.   The contact member protrudes in the direction of the first valve seat at the end portion on the side where the first through hole is formed, and a protrusion (205, 405) that contacts the movable core when the contact member is inclined. 455), The fuel injection valve according to any one of claims 2 to 9. The movable core has a groove-shaped movable core side accommodation space (610) capable of accommodating the contact member on the contact member side,
The groove-shaped fixed core side accommodation space (630) formed in the same size as the accommodation space is formed on the movable core side of the fixed core, according to any one of claims 2 to 10. The fuel injection valve as described. The first needle has a first seal portion (662) capable of contacting the first valve seat,
The second needle has a second seal portion (672) that can contact the second valve seat,
The fuel injection valve according to any one of claims 1 to 11, wherein the first seal portion and the second seal portion are formed to have a spherical surface. The second needle includes a second shaft portion (721, 921) formed in a rod shape, and a second seal that is provided on the second valve seat side of the second shaft portion and contacts or separates from the second valve seat. Portions (722, 922) and second large diameter portions (723, 923) provided on the opposite side of the seal portion of the second shaft portion and having an outer diameter larger than the outer diameter of the second shaft portion. Have
The time difference actuating means is
A fuel supply passage (771, 859) having a first throttle channel (765, 864) through which fuel injected from a first injection hole (750, 855) where the first needle (71, 91) opens and closes flows. A communication path forming member (76, 846, 866) that forms a communication path (762, 842) communicating with
A first pressure chamber forming member (715, 755, 766, 848) that communicates with the communication path and forms a first pressure chamber (752, 840) on the side opposite to the first valve seat side of the first needle. 866, 916),
A second pressure chamber forming member (781, 789, 794, 867, 883, 926) for forming a second pressure chamber (782, 850) on the second valve seat side of the second large diameter portion;
A control passage forming member (83, 843, 866) for forming a control passage (831, 865) for communicating the first pressure chamber and the second pressure chamber;
The fuel injection valve according to claim 1, wherein the fuel injection valve is formed of:   The control passage forming member communicates the first pressure chamber and the control passage, or communicates the second pressure chamber and the control passage, and is smaller than a cross-sectional area of the control passage. The fuel injection valve according to claim 13, further comprising a second throttle channel (865) having an area.   The said 2nd injection hole is formed so that the distance with the ignition plug which an internal combustion engine has becomes short compared with the distance between the said ignition plug and the said 1st injection hole. The fuel injection valve as described.   The fuel injection valve according to any one of claims 1 to 15, wherein the first injection hole has a cross-sectional area larger than a cross-sectional area of the second injection hole.

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