JP6187563B2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

Info

Publication number
JP6187563B2
JP6187563B2 JP2015189414A JP2015189414A JP6187563B2 JP 6187563 B2 JP6187563 B2 JP 6187563B2 JP 2015189414 A JP2015189414 A JP 2015189414A JP 2015189414 A JP2015189414 A JP 2015189414A JP 6187563 B2 JP6187563 B2 JP 6187563B2
Authority
JP
Japan
Prior art keywords
movable core
bush
needle
fuel injection
formed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2015189414A
Other languages
Japanese (ja)
Other versions
JP2015232334A (en
Inventor
順 山下
順 山下
伊藤 栄次
栄次 伊藤
Original Assignee
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to JP2015189414A priority Critical patent/JP6187563B2/en
Publication of JP2015232334A publication Critical patent/JP2015232334A/en
Application granted granted Critical
Publication of JP6187563B2 publication Critical patent/JP6187563B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

  The present invention relates to a fuel injection valve that injects and supplies fuel to an internal combustion engine.

  2. Description of the Related Art Conventionally, there has been known a fuel injection valve having a configuration in which an end opposite to a nozzle hole of a needle that reciprocates in a housing is supported by an inner wall of a fixed core. For example, in the fuel injection valves described in Patent Documents 1 and 2, when the needle reciprocates, the outer wall at the end opposite to the needle hole of the needle and the inner wall of the fixed core are in sliding contact. Since the needle is a member that repeatedly contacts (seats) with the valve seat, it is generally formed of a material having relatively high hardness from the viewpoint of wear resistance, impact resistance, and the like. On the other hand, since the fixed core is formed of a magnetic material, the hardness is relatively low. Therefore, when the needle and the fixed core are repeatedly slidably contacted due to the long-term use of the fuel injection valve, the fixed core and the needle may be worn particularly on the fixed core side. When the fixed core wears, the performance of the fuel injection valve, such as fuel pressure and injection amount, changes compared to the initial use due to changes in the magnetic properties of the fixed core, changes in posture when the needle opens, and changes in sliding resistance due to wear. There is a fear.

  Moreover, in the fuel injection valves of Patent Documents 1 and 2, it is considered from the description in the drawings that the movable core is provided such that the outer wall is slidable with the inner wall of the housing. For this reason, if the movable core and the housing are repeatedly brought into sliding contact with each other over a long period of use, the sliding contact portion may be worn. The wear may change the magnetic properties of the movable core.

  As described above, when the magnetic characteristics of the fixed core or the movable core change due to long-term use, the performance of the fuel injection valve such as the fuel pressure and the injection amount may be changed or lowered compared to the initial use. In addition, in a configuration in which there are many sliding contact portions between members in the fuel injection valve, the generation of wear powder may increase.

Special table 2004-518858 gazette JP-T-2005-504218

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a fuel injection valve capable of suppressing a change in performance of the fuel injection amount due to aging of members.

The fuel injection valve according to claim 1 includes a housing, a needle, a movable core, a fixed core, a coil, a first biasing member, and a bush. The housing is formed in a cylindrical shape and has a nozzle hole formed at one end in the axial direction, a valve seat formed around the nozzle hole, and a fuel passage through which fuel flows to the nozzle hole. doing. The needle is formed in a rod shape and is provided in the housing so as to be reciprocally movable. The needle has a seal portion formed at an end portion on the valve seat side and a large diameter portion formed so as to extend in the radially outward direction. The needle opens and closes the nozzle hole when the seal portion is separated from the valve seat or seated on the valve seat. The movable core has an outer diameter larger than the outer diameter of the large diameter portion of the needle, and is formed separately from the needle. The movable core is kicked setting the seal portion side of the large diameter portion. The fixed core is formed in a cylindrical shape and is provided on the valve opening direction side of the movable core. The coil attracts the movable core together with the needle in the valve opening direction by generating a magnetic attractive force between the movable core and the fixed core by energization. The first biasing member biases the needle in the valve closing direction. The bush is formed separately from the fixed core and in a cylindrical shape, and is provided inside the fixed core. The bush has an inner projecting portion formed so as to project radially inward from the cylindrical portion and the inner wall of the cylindrical portion, and the inner wall of the inner projecting portion slides on the outer wall of the large diameter portion which is a part of the needle. The needle is supported so as to reciprocate by contact.

With the above configuration, in the present invention, the fixed core supports the end portion on the large-diameter portion side of the needle via the bush so that the needle can reciprocate within the housing. Therefore, when the needle reciprocates within the housing, the needle and the fixed core do not slide. Therefore, the fixed core is not worn as the needle reciprocates. Therefore, secular change of the fixed core due to long-term use of the fuel injection valve can be suppressed. Therefore, it can suppress that the performance of fuel injection valves, such as fuel pressure and injection quantity, changes or falls compared with the use initial stage.
In the present invention, since the bush is separate from the fixed core, it can be formed of a material different from that of the fixed core. For example, if the bush is made of a material having a higher hardness than the fixed core, it is possible to suppress wear of the bush due to sliding contact with the large diameter portion of the needle.
For example, if the bush is formed of a material having the same hardness as the needle, wear of both the bush and the needle accompanying sliding contact between the bush and the large diameter portion of the needle can be suppressed.
In the invention according to claim 2, the axial sliding contact length between the inner projecting portion and the large-diameter portion is from when the seal portion is separated from the valve seat until the movable core contacts the fixed core or bush. It is constant.
In the invention according to claim 3, when the seal portion is seated on the valve seat, the end surface on the side opposite to the injection hole of the inner protruding portion and the end surface on the side opposite to the injection hole of the large diameter portion are: At substantially the same position in the axial direction of the needle.
In the invention according to claim 4, the axial length of the inner protruding portion is shorter than the axial length of the large diameter portion.

In the invention according to claim 5, the bush is formed of a material having a hardness higher than that of the fixed core. Therefore, the wear of the bush accompanying the sliding contact with the large diameter portion of the needle can be suppressed.
In the invention according to claim 6, the bush is made of a material having the same hardness as the needle. Therefore, wear of both the bush and the needle accompanying sliding contact between the bush and the large diameter portion of the needle can be suppressed.

  In the invention according to claim 7, the bush is provided such that the end surface on the movable core side is located closer to the movable core than the end surface on the movable core side of the fixed core. Therefore, when the movable core is sucked in the valve opening direction by the coil, the end surface of the movable core on the bush side does not collide with the fixed core, although it collides with the bush. Therefore, it is possible to prevent the fixed core from being worn and damaged due to the collision with the movable core. Thereby, the performance change of the fuel injection quantity by the secular change of a fixed core can be suppressed. In addition, with this configuration, it is not necessary to perform special treatment such as plating for improving wear resistance and impact resistance on the end surface of the fixed core on the movable core side, so that the manufacturing cost can be reduced.

  In the invention according to claim 8, the bush is made of a material having a saturation magnetic flux density lower than that of the fixed core. When the bush is made of, for example, a nonmagnetic material, weak magnetic material, or a material having a lower saturation magnetic flux density than the fixed core, and the fixed core is made of a material having a higher saturation magnetic flux density than the bush, such as a magnetic material (ferromagnetic material) When the coil is energized, the magnetic flux is less likely to flow through the bush, so that the increase in the magnetic flux density of the movable core and the fixed core can be accelerated. Thereby, the rise of the magnetic attractive force generated between the movable core and the fixed core can be accelerated. As a result, the responsiveness when the needle is opened can be improved.

  By the way, when the movable core side end face of the bush and the bush side end face of the movable core are in contact with each other, when the movable core that is in contact with the bush is separated from the bush during operation of the fuel injection valve, the bush And a linking force is generated between the end faces of the movable core. The linking force acts to prevent the movable core from moving away from the bush. Therefore, when the linking force is large, the responsiveness when the needle is closed may be reduced. In particular, when fuel is present around the bush and the movable core, there is a concern that the linking force is increased.

  Therefore, in the invention according to claim 9, the bush has a first groove formed on the end surface on the movable core side so as to be recessed toward the side opposite to the movable core. Thereby, the contact area of a bush and a movable core can be made small. Therefore, the linking force generated between the bush and the movable core can be reduced. Therefore, the responsiveness when the needle is closed can be improved.

  By the way, when the fuel injection valve is operated, when the movable core is sucked by the coil in the valve opening direction and collides with the bush or the fixed core, a squeeze force (due to the fluid between the end surfaces) is generated between the end surfaces of the movable core and the bush and the fixed core. The resulting force). The squeeze force acts to prevent the movable core from colliding with the bush or the fixed core. Therefore, when the squeeze force is excessively large, the speed of the movable core when colliding with the bush or the fixed core becomes a predetermined value or less, and there is a possibility that the performance variation of each fuel injection valve with respect to the fuel pressure, the injection amount, etc. will increase. is there. In particular, when fuel is present around the bush, the fixed core, and the movable core, there is a concern that the squeeze force increases. Further, when the squeeze force is large, there is a risk that the robustness against the secular change of the movable core is lowered.

Therefore, in the invention described in claim 10, the movable core has a second groove formed on the end surface on the bush side so as to be recessed toward the opposite side to the bush. As a result, when the movable core is sucked in the valve opening direction by the coil and collides with the bush or the fixed core, the fluid (fuel) between the end surfaces of the movable core and the bush and the fixed core is allowed to escape to the second groove. Generation of a strong squeeze force can be suppressed. Therefore, the speed of the movable core when colliding with the bush or the fixed core can be set to a predetermined value or more. As a result, it is possible to reduce the performance variation of each fuel injection valve with respect to the fuel pressure and the injection amount. Moreover, the robustness with respect to the secular change of a movable core can be improved by suppressing generation | occurrence | production of an excessive squeeze force.
Moreover, the contact area of a movable core and a bush or a fixed core can be made small because a movable core has a 2nd groove | channel. Therefore, the linking force generated between the bush or fixed core and the movable core can be reduced. Therefore, the responsiveness when the needle is closed can be improved.

  In the invention described in claim 11, the movable core has an outer diameter smaller than the inner diameter of the housing. Therefore, in this invention, it can be set as the structure which the outer wall of a movable core does not slidably contact with the inner wall of a housing. With this configuration, wear of the outer wall of the movable core can be prevented. Thereby, the secular change of the magnetic characteristic of a movable core can be suppressed. Moreover, in this structure, since the sliding contact location of the members in a fuel injection valve can be reduced, generation | occurrence | production of abrasion powder can be suppressed.

  The invention described in claim 12 further includes a second urging member for urging the movable core together with the needle in the valve opening direction. The movable core is provided separately from the needle and is movable relative to the needle. In the present invention, the damper effect of the movable core and the needle suppresses excessive bounce of the needle when the seat portion of the needle is seated on the valve seat and when the movable core collides with the bush or the fixed core. it can.

Sectional drawing which shows the fuel injection valve by 1st Embodiment of this invention. The fragmentary sectional view which shows the principal part of the fuel injection valve by 1st Embodiment of this invention. (A) is sectional drawing which shows the bush of the fuel injection valve by 1st Embodiment of this invention, (B) is the figure which looked at (A) from the arrow B direction, (C) is by 1st Embodiment of this invention. The top view which looked at the movable core of a fuel injection valve from the arrow IIIC direction of FIG. 2, (D) is the DD sectional view taken on the line of (C). (A) is sectional drawing which shows the bush of the fuel injection valve by 2nd Embodiment of this invention, (B) is the figure which looked at (A) from the arrow B direction. (A) is a top view which shows the movable core of the fuel injection valve by 3rd Embodiment of this invention, (B) is the BB sectional drawing of (A), (C) is (A) from the arrow C direction. Viewed. The fragmentary sectional view which shows the principal part of the fuel injection valve by 4th Embodiment of this invention.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. Note that, in a plurality of embodiments, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
A fuel injection valve according to a first embodiment of the present invention is shown in FIG. The fuel injection valve 10 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 10 includes a housing 20, a needle 40, a movable core 50, a fixed core 60, a coil 70, a spring 81 as a first urging member, a spring 82 as a second urging member, a bush 90, and the like. ing.
As shown in FIG. 1, the housing 20 includes a first cylinder member 21, a second cylinder member 22, a third cylinder member 23, and an injection nozzle 30. The first cylinder member 21, the second cylinder member 22, and the third cylinder member 23 are all formed in a substantially cylindrical shape, and are coaxial in the order of the first cylinder member 21, the second cylinder member 22, and the third cylinder member 23. Arranged and connected to each other.

  The 1st cylinder member 21 and the 3rd cylinder member 23 are formed, for example with magnetic materials, such as ferritic stainless steel, and the magnetic stabilization process is performed. The first cylinder member 21 and the third cylinder member 23 have a relatively low hardness. On the other hand, the second cylindrical member 22 is formed of a nonmagnetic material such as austenitic stainless steel, for example. The hardness of the second cylinder member 22 is higher than the hardness of the first cylinder member 21 and the third cylinder member 23.

  The injection nozzle 30 is provided at the end of the first cylinder member 21 opposite to the second cylinder member 22. The injection nozzle 30 is made of a metal such as martensitic stainless steel. The injection nozzle 30 is subjected to a quenching process so as to have a predetermined hardness.

  The injection nozzle 30 is formed in a substantially bottomed cylindrical shape and has a bottom portion 31 and a cylindrical portion 32. The bottom portion 31 closes one end portion of the cylindrical portion 32. An injection hole 311 that connects the inner wall and the outer wall is formed in the bottom 31. An annular valve seat 312 is formed on the inner wall of the bottom 31 so as to surround the nozzle hole 311. The cylinder portion 32 is connected to the first cylinder member 21 such that the outer wall is fitted to the inner wall of the first cylinder member 21. The fitting part of the cylinder part 32 and the 1st cylinder member 21 is welded.

  The needle 40 is formed in a rod shape from a metal such as martensitic stainless steel. The needle 40 is subjected to a quenching process so as to have a predetermined hardness. The hardness of the needle 40 is set substantially equal to the hardness of the injection nozzle 30.

  The needle 40 is accommodated in the housing 20 so as to be capable of reciprocating in the axial direction. A seal portion 41 that can contact the valve seat 312 is formed at the end of the needle 40 on the injection nozzle 30 side. The needle 40 has a sliding contact portion 42 at a position away from the seal portion 41 in the axial direction by a predetermined distance. The sliding contact portion 42 is formed in a substantially cylindrical shape, and a part of the outer wall 421 is chamfered. In the sliding contact portion 42, the portion of the outer wall 421 that is not chamfered can be in sliding contact with the inner wall 321 of the cylindrical portion 32 of the injection nozzle 30. As a result, the needle 40 is guided to reciprocate at the tip of the nozzle hole 311 side.

  The needle 40 has a large-diameter portion 43 formed to extend from the end opposite to the seal portion 41 in the radially outward direction, that is, toward the inner wall 24 of the housing 20. In the present embodiment, the large diameter portion 43 is formed in a substantially annular shape. The needle 40 opens and closes the nozzle hole 311 when the seal portion 41 is separated (separated) from the valve seat 312 or seated (abutted) on the valve seat 312. Hereinafter, the direction in which the needle 40 is separated from the valve seat 312 is referred to as the valve opening direction, and the direction in which the needle 40 is seated on the valve seat 312 is referred to as the valve closing direction. The large diameter portion 43 side of the needle 40 is formed in a hollow cylindrical shape, and a hole 44 that connects the inner wall 45 and the outer wall 46 is formed.

  The movable core 50 is formed in a substantially cylindrical shape by a magnetic material such as ferritic stainless steel. The movable core 50 is subjected to a magnetic stabilization process. The hardness of the movable core 50 is relatively low and is substantially equal to the hardness of the first cylindrical member 21 and the third cylindrical member 23 of the housing 20.

The movable core 50 is provided inside the housing 20 so that the needle 40 is inserted inside. In the movable core 50, the end surface 53 on the side opposite to the seal portion 41 can abut on the end surface on the seal portion 41 side of the large diameter portion 43 of the needle 40. That is, the movable core 50 is provided separately from the needle 40 on the seal portion 41 side of the large diameter portion 43. The movable core 50 has an inner wall 51 that can slide in contact with the outer wall 46 of the needle 40. Thereby, the movable core 50 can be moved relative to the needle 40 in the axial direction. The movable core 50 is formed so that the outer diameter is smaller than the inner diameter of the housing 20, that is, the end of the first cylinder member 21 on the second cylinder member 22 side and the inner diameter of the second cylinder member 22.
Further, the end of the movable core 50 on the seal portion 41 side is formed so that the inner diameter is larger than other portions in the axial direction. Thereby, the annular level | step difference surface 54 is formed inside the movable core 50 (refer FIG. 1 and 2).

  The fixed core 60 is formed in a substantially cylindrical shape by a magnetic material such as ferritic stainless steel. The fixed core 60 is subjected to a magnetic stabilization process. The fixed core 60 has a relatively low hardness and is approximately equal to the hardness of the movable core 50. The fixed core 60 is provided so as to be fixed inside the housing 20. The fixed core 60 and the third cylinder member 23 of the housing 20 are welded. The end of the fixed core 60 on the side of the movable core 50 is formed so that the inner diameter is larger than other portions in the axial direction. As a result, an annular step surface 61 is formed inside the fixed core 60 (see FIGS. 1 and 2).

  The coil 70 is formed in a substantially cylindrical shape, and is provided so as to surround the outer side in the radial direction of the second cylindrical member 22 and the third cylindrical member 23 of the housing 20. The coil 70 generates a magnetic force when electric power is supplied (energized). When a magnetic force is generated in the coil 70, a magnetic circuit is formed in the fixed core 60, the movable core 50, the first cylindrical member 21, and the third cylindrical member 23. As a result, a magnetic attractive force is generated between the fixed core 60 and the movable core 50, and the movable core 50 is attracted to the fixed core 60. At this time, since the end surface 53 of the movable core 50 contacts the large diameter portion 43 of the needle 40, the needle 40 moves together with the movable core 50 in the fixed core 60 side, that is, in the valve opening direction. As a result, the seal portion 41 is separated from the valve seat 312 and the nozzle hole 311 is opened.

  The spring 81 is provided so that one end is in contact with the end of the needle 40 on the large diameter portion 43 side. The other end of the spring 81 is in contact with one end of the adjusting pipe 11 that is press-fitted and fixed inside the fixed core 60. The spring 81 has a force that extends in the axial direction. Thereby, the spring 81 urges the needle 40 together with the movable core 50 in the valve closing direction.

One end of the spring 82 is provided so as to contact the stepped surface 54 of the movable core 50. The other end of the spring 82 is in contact with an annular step surface 211 formed inside the first cylindrical member 21 of the housing 20. The spring 82 has a force extending in the axial direction. Thereby, the spring 82 urges the movable core 50 together with the needle 40 in the valve opening direction.
In the present embodiment, the urging force of the spring 81 is set larger than the urging force of the spring 82. Therefore, in a state where power is not supplied (energized) to the coil 70, the seal portion 41 of the needle 40 is in a state of being seated on the valve seat 312, that is, a valve-closed state.

  The bush 90 is formed in a cylindrical shape from a metal such as martensitic stainless steel. The bushing 90 is subjected to a quenching process so as to have a predetermined hardness. The bush 90 is harder than the fixed core 60. The hardness of the bush 90 is set substantially equal to the hardness of the needle 40. Further, the bush 90 has a saturation magnetic flux density lower than that of the fixed core 60.

  As shown in FIG. 2, the bush 90 has a cylindrical portion 91 and an inner protruding portion 92. The cylinder part 91 is formed in a cylindrical shape. The inner projecting portion 92 is formed in a cylindrical shape so as to project radially inward from the inner wall of the end portion of the cylindrical portion 91 on the movable core 50 side. Therefore, the inner diameter of the inner protruding portion 92 is smaller than the inner diameter of the cylindrical portion 91.

  The bush 90 is provided on the inner side of the fixed core 60 so that the end of the cylindrical portion 91 opposite to the movable core 50 contacts the stepped surface 61. Here, the outer wall of the cylindrical portion 91 is in close contact with the inner wall of the fixed core 60. Thereby, the bush 90 is fixed inside the fixed core 60.

An inner wall of the inner projecting portion 92, that is, a part of the inner wall of the bush 90 can be slidably contacted with an outer wall of the large-diameter portion 43 of the needle 40. Thereby, when the needle 40 reciprocates in the housing 20, the end on the large diameter portion 43 side is supported by the bush 90. That is, the bush 90 supports the needle 40 so as to be able to reciprocate when the inner wall is in sliding contact with the outer wall of the large-diameter portion 43.
Further, as described above, when the needle 40 reciprocates in the housing 20, the sliding contact portion 42 (end portion on the injection hole 311 side) is supported by the cylindrical portion 32 of the injection nozzle 30. Thus, in this embodiment, the needle 40 is supported at two locations in the axial direction (the large diameter portion 43 and the sliding contact portion 42), and reciprocates inside the housing 20.
Further, as described above, the outer diameter of the movable core 50 is formed smaller than the inner diameter of the housing 20, that is, the end of the first cylinder member 21 on the second cylinder member 22 side, and the inner diameter of the second cylinder member 22. Yes. Therefore, although the inner wall 51 is in sliding contact with the outer wall 46 of the needle 40, the movable core 50 can reciprocate inside the housing 20 without being in sliding contact with the inner wall 24 of the housing 20.

  Further, the bush 90 has an end surface 93 on the side of the movable core 50 (an end surface on the side of the movable core 50 of the cylindrical portion 91 and the inner protrusion 92) in a state where the end opposite to the movable core 50 is in contact with the step surface 61. ) Is provided on the movable core 50 side of the end surface 62 of the fixed core 60 on the movable core 50 side (see FIG. 2). Therefore, when the movable core 50 is attracted toward the fixed core 60 (in the valve opening direction) by the magnetic attraction force, the end surface 53 collides with the end surface 93 of the bush 90. Thereby, the movement of the movable core 50 in the valve opening direction is restricted. That is, the bush 90 functions as a stopper for the movable core 50.

As shown in FIGS. 3A and 3B, the bush 90 has a first groove 94 formed on the end surface 93 on the movable core 50 side so as to be recessed toward the side opposite to the movable core 50. The first groove 94 is formed in an annular shape along the circumferential direction of the end surface 93.
As shown in FIGS. 3C and 3D, the movable core 50 has a second groove 55 formed on the end surface 53 on the bush 90 side so as to be recessed toward the opposite side of the bush 90. The second groove 55 is formed by, for example, cutting or die cutting. Four second grooves 55 are formed at equal intervals in the circumferential direction so as to extend outward from the center hole (inner wall 51) of the movable core 50. In the present embodiment, the second groove 55 is formed so that the cross-sectional shape of the virtual plane parallel to the axis of the movable core 50 is a rectangular shape. Therefore, the angle formed between the wall surfaces forming the second groove 55 and the angle formed between the wall surface forming the second groove 55 and the end surface 53 are approximately 90 degrees (see FIG. 3D). The depth of the second groove 55 is set to such a depth that fluid resistance does not occur when fluid (fuel) flows through the second groove 55.

  As shown in FIG. 1, a substantially cylindrical fuel introduction pipe 12 is press-fitted and welded to the end of the third cylinder member 23 opposite to the second cylinder member 22. A filter 13 is provided inside the fuel introduction pipe 12. The filter 13 collects foreign matters in the fuel that has flowed from the introduction port 14 of the fuel introduction pipe 12.

  The radially outer sides of the fuel introduction pipe 12 and the third cylinder member 23 are molded with resin. A connector 15 is formed in the mold part. The connector 15 is insert-molded with a terminal 16 for supplying electric power to the coil 70. Further, a cylindrical holder 17 is provided outside the coil 70 in the radial direction so as to cover the coil 70.

  The fuel that has flowed from the introduction port 14 of the fuel introduction pipe 12 flows inside the fixed core 60, the adjusting pipe 11 and the needle 40, the hole 44, between the first tubular member 21 and the needle 40, and between the injection nozzle 30 and the needle 40. Between them and led to the nozzle hole 311. That is, a fuel passage 18 through which fuel flows is formed inside the housing 20. When the fuel injection valve 10 is operated, the periphery of the movable core 50 is filled with fuel.

Next, the operation of the fuel injection valve 10 will be described.
When the coil 70 is energized, the movable core 50 is attracted to the fixed core 60. As a result, the needle 40 moves to the fixed core 60 side together with the movable core 50, and the seal portion 41 is separated from the valve seat 312. Thereby, the nozzle hole 311 will be in the open state (valve open state). The fuel flowing in from the inlet 14 of the fuel introduction pipe 12 flows through the fuel passage 18 and is injected from the injection hole 311. On the other hand, when the power supply to the coil 70 is turned off, the seal portion 41 of the needle 40 is seated on the valve seat 312 and closed. Thereby, fuel injection is interrupted | blocked.

  In the present embodiment, since the first groove 94 is formed in the end surface 93 of the bush 90 on the movable core 50 side, the contact area between the movable core 50 and the bush 90 can be reduced. Therefore, the linking force generated between the bush 90 and the movable core 50 is reduced when the fuel injection valve 10 is operated (when the movable core 50 that has been in contact with the bush 90 is separated from the bush 90 by the magnetic attraction force of the coil 70). can do. Thereby, the responsiveness when the needle 40 is closed can be improved.

  In addition, since the second groove 55 is formed in the end face 53 of the movable core 50 on the bush 90 side, the movable core 50 that is attracted by the magnetic attraction force of the coil 70 collides with the bush 90 when the fuel injection valve 10 is operated. When the fuel between the end faces of the movable core 50, the bush 90, and the fixed core 60 is released to the second groove 55, excessive squeeze force can be prevented from being generated. Thereby, the speed of the movable core 50 when colliding with the bush 90 can be set to a predetermined value or more.

Further, since the second groove 55 is formed in the end surface 53 of the movable core 50 on the bush 90 side, the contact area between the movable core 50 and the bush 90 can be further reduced. Therefore, the linking force generated between the bush 90 and the movable core 50 when the fuel injection valve 10 is operated can be further reduced. Therefore, the responsiveness when the needle 40 is closed can be further improved.
Further, in the present embodiment, the movable core 50 and the needle 40 constitute a damper mechanism so that the seat portion 41 of the needle 40 is seated on the valve seat 312 and the movable core 50 collides with the bush 90. Excessive bounce of the needle 40 can be suppressed.

  As described above, in the present embodiment, the fixed core 60 supports the end portion of the needle 40 on the large diameter portion 43 side via the bush 90 so that the needle 40 can reciprocate within the housing 20. Therefore, when the needle 40 reciprocates within the housing 20, the needle 40 and the fixed core 60 do not slide. Therefore, the fixed core 60 is not worn as the needle 40 reciprocates. Therefore, the change (aging) of the magnetic characteristics of the fixed core 60 due to long-term use of the fuel injection valve 10 can be suppressed. Therefore, it can suppress that the performance of the fuel injection valve 10 such as the fuel pressure and the injection amount changes or decreases compared to the initial use.

In the present embodiment, the bush 90 is a separate body from the fixed core 60, and thus can be formed of a material different from that of the fixed core 60. In the present embodiment, the bush 90 is formed of a material having higher hardness than the fixed core 60. Therefore, wear of the bush 90 accompanying sliding contact with the large diameter portion 43 of the needle 40 can be suppressed.
In the present embodiment, the bush 90 is formed of a material having the same hardness as the needle 40. Therefore, wear of both the bush 90 and the needle 40 due to the sliding contact between the bush 90 and the large diameter portion 43 of the needle 40 can be suppressed.

  In the present embodiment, the bush 90 is provided such that the end surface 93 on the movable core 50 side is positioned closer to the movable core 50 than the end surface 53 of the fixed core 60 on the movable core 50 side. Therefore, when the movable core 50 is attracted in the valve opening direction by the coil 70, the end surface 53 on the bush 90 side of the movable core 50 does not collide with the fixed core 60 although it collides with the bush 90. Therefore, wear and damage of the fixed core 60 due to the collision with the movable core 50 can be prevented. Thereby, the secular change of the magnetic characteristic of the fixed core 60 can be suppressed. Further, in this configuration, since it is not necessary to perform special treatment such as plating for improving wear resistance and impact resistance on the end face 62 of the fixed core 60 on the movable core 50 side, the manufacturing cost can be reduced. it can.

  In the present embodiment, the bush 90 is made of martensitic stainless steel and has a lower saturation magnetic flux density than the fixed core 60 made of ferrite stainless steel. Therefore, when the coil 70 is energized, the magnetic flux is less likely to flow through the bushing 90, so that the increase in the magnetic flux density of the movable core 50 and the fixed core 60 can be accelerated. Thereby, the rise of the magnetic attractive force generated between the movable core 50 and the fixed core 60 can be accelerated. As a result, the responsiveness when the needle 40 is opened can be improved.

  Moreover, in this embodiment, the bush 90 has the 1st groove | channel 94 formed in the end surface 93 at the side of the movable core 50 so that it may be dented in the opposite side to the movable core 50. FIG. Thereby, the contact area of the bush 90 and the movable core 50 can be reduced. Therefore, the linking force generated between the bush 90 and the movable core 50 can be reduced. Therefore, the responsiveness when the needle 40 is closed can be improved.

  Moreover, in this embodiment, the movable core 50 has the 2nd groove | channel 55 formed in the end surface 53 by the side of the bush 90 so that it may dent in the opposite side to the bush 90. FIG. Thus, when the movable core 50 is attracted in the valve opening direction by the coil 70 and collides with the bush 90, the fluid (fuel) between the end surfaces of the movable core 50, the bush 90 and the fixed core 60 is released to the second groove 55. Thus, generation of excessive squeeze force can be suppressed. Therefore, the speed of the movable core 50 when colliding with the bush 90 can be set to a predetermined value or more. As a result, the performance variation of each fuel injection valve 10 with respect to the fuel pressure and the injection amount can be reduced. Moreover, the robustness with respect to the secular change of the movable core 50 can be improved by suppressing generation | occurrence | production of an excessive squeeze force.

  Further, since the movable core 50 has the second groove 55, the contact area between the movable core 50 and the bush 90 or the fixed core 60 can be reduced. Therefore, the linking force generated between the bush 90 or the fixed core 60 and the movable core 50 can be reduced. Therefore, the responsiveness when the needle 40 is closed can be improved.

  In the present embodiment, the movable core 50 is formed so that the outer diameter is smaller than the inner diameter of the housing 20. Therefore, in this embodiment, the outer wall of the movable core 50 can be configured not to be in sliding contact with the inner wall of the housing 20. With this configuration, wear of the outer wall 52 of the movable core 50 can be prevented. Thereby, the secular change of the magnetic characteristic of the movable core 50 can be suppressed. Moreover, in this structure, since the sliding contact location of the members in the fuel injection valve 10 can be reduced, generation | occurrence | production of abrasion powder can be suppressed.

  In addition, the present embodiment further includes a spring 82 that urges the movable core 50 together with the needle 40 in the valve opening direction. The movable core 50 is provided separately from the needle 40 and is movable relative to the needle 40. In the present embodiment, due to a damper effect generated on the contact surface between the movable core 50 and the needle 40 (the contact surface between the end surface 53 of the movable core 50 and the end surface of the large diameter portion 43 of the needle 40 on the seal portion 41 side). When the seat portion 41 of the needle 40 is seated on the valve seat 312 and when the movable core 50 collides with the bush 90, excessive bounce of the needle 40 can be suppressed.

(Second Embodiment)
A fuel injection valve according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the shape of the bush 90 is different from that of the first embodiment.

  4A and 4B show a fuel injection valve bush 90 according to the second embodiment. In the second embodiment, a flow groove 95 is formed in the inner projecting portion 92 of the bush 90. The four flow grooves 95 are formed at equal intervals in the circumferential direction of the inner protrusion 92 so as to connect the end face of the inner protrusion 92 opposite to the movable core 50 and the end face on the movable core 50 side.

  As described above, in this embodiment, since the flow groove 95 is formed in the bush 90, the fuel inside the fixed core 60 flows through the flow groove 95 when the fuel injection valve is operated. It extends around the end face 53, the inner wall 51 and the outer wall 52 of the movable core 50. Accordingly, the movable core 50 and each member are lubricated, and an appropriate squeeze force is generated between the movable core 50, the bush 90, and the fixed core 60, thereby allowing an impact force between the movable core 50 and the bush 90. Can be kept within the range. Therefore, wear and damage of the movable core 50 and each member due to long-term use of the fuel injection valve can be suppressed.

(Third embodiment)
A fuel injection valve according to a third embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the shape of the second groove 55 of the movable core 50 is different from that of the first embodiment.

  5A to 5C show the movable core 50 of the fuel injection valve according to the third embodiment. In the third embodiment, the second groove 55 is formed so that the cross-sectional shape of a virtual plane parallel to the axis of the movable core 50 is an inverted triangle (V-shape). Therefore, the angle formed between the wall surfaces forming the second groove 55 and the angle formed between the wall surface forming the second groove 55 and the end surface 53 are obtuse angles (see FIGS. 5B and 5C).

  As described above, in the present embodiment, the angle formed between the wall surfaces forming the second groove 55 of the movable core 50 and the angle formed between the wall surface forming the second groove 55 and the end surface 53 are obtuse angles. As a result, the generation of burrs associated with the formation of the second groove 55 can be suppressed. Therefore, variation in resistance (fluid resistance) of the fluid (fuel) flowing through the second groove 55 can be suppressed.

(Fourth embodiment)
A fuel injection valve according to a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the shape of the bush 90 is different from that of the first embodiment.

  As shown in FIG. 6, in the fourth embodiment, the bush 90 is a cylindrical outer protrusion formed so as to protrude radially outward from the outer wall of the end portion of the cylinder portion 91 opposite to the movable core 50. 96. Therefore, the outer diameter of the outer protruding portion 96 is larger than the outer diameter of the cylindrical portion 91. The end surface of the outer protrusion 96 on the movable core 50 side is formed in a tapered shape. A flow hole 97 is formed in the bush 90 so as to connect the tapered end face and the inner wall of the cylindrical portion 91. Four circulation holes 97 are formed at equal intervals in the circumferential direction of the cylindrical portion 91 so as to be inclined with respect to the axis of the cylindrical portion 91.

  The bush 90 is provided on the inner side of the fixed core 60 so that the ends of the cylindrical portion 91 and the outer protruding portion 96 opposite to the movable core 50 abut against the step surface 61. Here, the outer wall of the outer protrusion 96 is in close contact with the inner wall of the fixed core 60. Thereby, the bush 90 is fixed inside the fixed core 60. In this state, a substantially cylindrical space S is formed between the outer wall of the cylindrical portion 91 and the inner wall of the fixed core 60. The space S is connected to each circulation hole 97.

  In the present embodiment, as in the first embodiment, the bush 90 has an end surface 93 (cylinder portion 91) on the movable core 50 side in a state where the end portion on the opposite side to the movable core 50 is in contact with the step surface 61. And the end surface on the movable core 50 side of the inner projecting portion 92) is provided so as to be positioned closer to the movable core 50 than the end surface 62 of the fixed core 60 on the movable core 50 side.

  As described above, in the present embodiment, since the flow hole 97 is formed in the bush 90 and the space S is formed between the cylindrical portion 91 and the fixed core 60, the fixed core is activated during the operation of the fuel injection valve. The fuel inside 60 circulates through the circulation hole 97 and the space S and spreads around the end surface 53, the inner wall 51 and the outer wall 52 of the movable core 50. Accordingly, the movable core 50 and each member are lubricated, and an appropriate squeeze force is generated between the movable core 50, the bush 90, and the fixed core 60, thereby allowing an impact force between the movable core 50 and the bush 90. Can be kept within the range. Therefore, wear and damage of the movable core 50 and each member due to long-term use of the fuel injection valve can be suppressed.

(Other embodiments)
In the above-mentioned embodiment, the example which forms a bush and a needle with martensitic stainless steel was shown. On the other hand, in another embodiment of the present invention, the bush and the needle may be formed of a magnetic material such as a two-phase, precipitation hardened or ferritic stainless steel, or iron. Further, the bush and the needle may be formed of a nonmagnetic material such as austenitic stainless steel, aluminum, titanium, copper, or ceramic. However, since ferritic stainless steel and iron have relatively low hardness, and iron has low corrosion resistance (rust) to fuel, bushes and needles have relatively high hardness and corrosion resistance (rust). It is desirable to form with high martensite type, two phase type, precipitation hardening type or austenitic type stainless steel, titanium, ceramic or the like. Note that the bush and the needle may be formed of different materials.

  Moreover, in the above-mentioned embodiment, the example which forms a fixed core and a movable core with a ferritic stainless steel was shown. On the other hand, in another embodiment of the present invention, the fixed core and the movable core may be formed of a martensitic, two-phase or precipitation hardening stainless steel, or a magnetic material such as iron. However, although iron has a high saturation magnetic flux density but low corrosion resistance (rust), the fixed core and the movable core are made of ferritic stainless steel with high saturation magnetic flux density and high corrosion resistance (rust). It is desirable. Note that the fixed core and the movable core may be formed of different materials.

  Thus, in the present invention, the bush, needle, fixed core, and movable core are formed of any material as shown above, regardless of the hardness, saturation magnetic flux density, corrosion resistance (rust) resistance, and the like. May be. In the first to fourth embodiments described above, the bush is formed of a material (martensitic stainless steel) having a saturation magnetic flux density lower than that of the fixed core (ferritic stainless steel). On the other hand, for example, if the bush is made of a non-magnetic material such as austenitic stainless steel, which has a lower saturation magnetic flux density than martensitic stainless steel, the magnetic flux is less likely to flow through the bush when the coil is energized. The increase in the magnetic flux density of the core 50 and the fixed core 60 can be further accelerated. Thereby, the rise of the magnetic attractive force generated between the movable core 50 and the fixed core 60 can be accelerated. As a result, the responsiveness when the needle 40 is opened can be further improved.

  In the above-described embodiment, an example in which the bush is provided so that the end surface on the movable core side is located closer to the movable core than the end surface on the movable core side of the fixed core has been described. On the other hand, in another embodiment of the present invention, the bush may be provided such that the end surface on the movable core side is located on the opposite side of the movable core from the end surface on the movable core side of the fixed core. The bush may be provided so that the end surface on the movable core side is at the same position as the end surface on the movable core side of the fixed core.

In another embodiment of the present invention, the first groove formed in the bush and the second groove formed in the movable core may have any shape and any number. Further, the bush may not have the first groove. In addition, the movable core may not have the second groove.
In another embodiment of the present invention, the number of flow grooves or flow holes formed in the bush is not limited to four, and may be any number.

Moreover, in the above-mentioned embodiment, the bush has an inner protrusion, and the example in which the large diameter portion of the needle is supported by the inner wall of the inner protrusion so as to be slidable and reciprocally movable is shown. On the other hand, in another embodiment of the present invention, the bush may have no inner projecting portion, and may support the large diameter portion of the needle so as to be slidable and reciprocally movable on the inner wall of the cylindrical portion.
In another embodiment of the present invention, the movable core may have an outer diameter that is substantially the same as the inner diameter of the housing, and may be slidably contacted with the inner wall of the housing.

In another embodiment of the present invention, the movable core and the needle may be fixed integrally (relatively impossible) or may be integrally formed of the same material. Moreover, the structure which is not provided with the 2nd biasing member may be sufficient.
Moreover, in other embodiment of this invention, the 1st cylinder member and the injection nozzle may be integrally formed with the same material.
The fuel injection valve of the present invention is not limited to a direct injection type gasoline engine, and may be applied to, for example, a port injection type gasoline engine or a diesel engine.
Thus, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 10 ... Fuel injection valve 18 ... Fuel passage 20 ... Housing 21 ... First cylinder member (housing)
22 .... Second cylinder member (housing)
23... Third cylinder member (housing)
30... Injection nozzle (housing)
311 ... Injection hole 312 ... Valve seat 40 ... Needle 41 ... Seal part 43 ... Large diameter part 50 ... Movable core 60 ... Fixed core 70 ... .... Coil 81 ... ... Spring (first biasing member)
90 ・ ・ ・ ・ Bush

Claims (14)

  1. A nozzle hole formed at one end in the axial direction, into which fuel is injected, a valve seat formed around the nozzle hole, and a cylindrical housing having a fuel passage through which fuel flows to the nozzle hole;
    A seal portion provided at an end portion on the valve seat side, and a large-diameter portion formed so as to extend in a radially outward direction; A rod-like needle that opens and closes the nozzle hole by being separated from the seat or seated on the valve seat;
    The outer diameter greater than the outer diameter of the large-diameter portion, and the needle is formed as a separate body, and the movable core to be eclipsed set the seal portion side of the large diameter portion,
    A cylindrical fixed core provided on the valve opening direction side of the movable core;
    A coil that attracts the movable core together with the needle in the valve opening direction by generating a magnetic attractive force between the movable core and the fixed core by energization;
    A first urging member for urging the needle in the valve closing direction;
    Formed separately from the fixed core, provided inside the fixed core, and having a cylindrical portion and an inner protruding portion formed so as to protrude radially inward from the inner wall of the cylindrical portion, A cylindrical bush that supports the needle so as to be capable of reciprocating by an inner wall being in sliding contact with an outer wall of the large-diameter portion that is a part of the needle;
    A fuel injection valve comprising:
  2.   The fuel injection valve according to claim 1, wherein the bush is capable of restricting movement of the movable core in a valve opening direction.
  3.   The outer diameter of the end surface of the bush on the movable core side is the same as the outer diameter of the end surface of the bush opposite to the movable core,
      3. The fuel injection valve according to claim 1, wherein an inner diameter of an end surface of the bush on the movable core side is smaller than an inner diameter of an end surface of the bush opposite to the movable core.
  4. The sliding contact length in the axial direction between the inner projecting portion and the large diameter portion is constant from when the seal portion is separated from the valve seat until the movable core contacts the fixed core or the bush. It exists, The fuel injection valve as described in any one of Claims 1-3 characterized by the above-mentioned.
  5. When the seal portion is seated on the valve seat, the end surface of the inner protruding portion opposite to the nozzle hole and the end surface of the large diameter portion opposite to the nozzle hole are defined by the needle. The fuel injection valve according to any one of claims 1 to 4, wherein the fuel injection valve is at substantially the same position in the axial direction.
  6. Wherein the axial length of the inner protrusion, the fuel injection valve according to any one of claims 1 to 5, wherein the shorter than the axial length of the large diameter portion.
  7. The fuel injection valve according to any one of claims 1 to 6 , wherein the bush is formed of a material having a hardness higher than that of the fixed core.
  8. The fuel injection valve according to any one of claims 1 to 7 , wherein the bush is formed of a material having the same hardness as the needle.
  9. The bush, the end face of the movable core side, any one of the claims 1-8, characterized in that provided that the end face of the movable core side of the fixed core located in the movable core side The fuel injection valve according to Item.
  10. The bush, the fuel injection valve according to any one of claims 1 to 9, characterized in that the saturation magnetic flux density is formed at a lower material than the fixed core.
  11. The fuel injection according to any one of claims 1 to 10 , wherein the bush has a first groove formed on an end surface on the movable core side so as to be recessed toward the opposite side of the movable core. valve.
  12. The fuel injection valve according to any one of claims 1 to 11 , wherein the movable core has a second groove formed on the end surface on the bush side so as to be recessed toward the opposite side of the bush. .
  13. The fuel injection valve according to any one of claims 1 to 12 , wherein the movable core has an outer diameter smaller than an inner diameter of the housing.
  14. A second urging member that urges the movable core together with the needle in a valve opening direction;
    The fuel injection valve according to any one of claims 1 to 13 , wherein the movable core is provided separately from the needle and is movable relative to the needle.
JP2015189414A 2015-09-28 2015-09-28 Fuel injection valve Active JP6187563B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015189414A JP6187563B2 (en) 2015-09-28 2015-09-28 Fuel injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015189414A JP6187563B2 (en) 2015-09-28 2015-09-28 Fuel injection valve

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2011244280 Division 2011-11-08

Publications (2)

Publication Number Publication Date
JP2015232334A JP2015232334A (en) 2015-12-24
JP6187563B2 true JP6187563B2 (en) 2017-08-30

Family

ID=54933904

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015189414A Active JP6187563B2 (en) 2015-09-28 2015-09-28 Fuel injection valve

Country Status (1)

Country Link
JP (1) JP6187563B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019065408A1 (en) * 2017-09-29 2019-04-04 株式会社デンソー Fuel injection valve

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3408012A1 (en) * 1984-03-05 1985-09-05 Mesenich Gerhard Electromagnetic injection valve
DE4131500A1 (en) * 1991-09-21 1993-03-25 Bosch Gmbh Robert Electromagnetically operated injection valve
IT1250845B (en) * 1991-10-11 1995-04-21 Weber Srl Valve fuel metering and atomizing electromagnetic drive for a power supply device of an internal combustion engine
IT1261156B (en) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat Electromagnet controlling a metering valve for a fuel injector
JPH07208293A (en) * 1994-01-11 1995-08-08 Hitachi Automot Eng Co Ltd Electromagnetic fuel injection valve
DE4415850A1 (en) * 1994-05-05 1995-11-09 Bosch Gmbh Robert Valve needle for an electromagnetically actuated valve
JP2811053B2 (en) * 1995-06-08 1998-10-15 株式会社ケーヒン Electromagnetic fuel injection valve
JP3441295B2 (en) * 1996-05-15 2003-08-25 株式会社日立製作所 Fuel injection valve
JPH10220319A (en) * 1997-02-06 1998-08-18 Denso Corp Fuel injection valve
JP2000170619A (en) * 1998-12-09 2000-06-20 Keihin Corp Manufacture of core of electromagnetic fuel injection valve
JP2000170620A (en) * 1998-12-09 2000-06-20 Keihin Corp Assembly of magnetic material and non-magnetic material in electromagnetic fuel injection valve, and manufacture of fixed core system assembly
US7021569B1 (en) * 2000-01-26 2006-04-04 Hitachi, Ltd. Fuel injection valve
JP2001234831A (en) * 2000-02-24 2001-08-31 Hitachi Car Eng Co Ltd Fuel injection valve for internal combustion engine
JP3851122B2 (en) * 2001-07-16 2006-11-29 ボッシュ株式会社 Fuel injection valve
JP2003269288A (en) * 2002-03-15 2003-09-25 Bosch Automotive Systems Corp Fuel injector
JP3819907B2 (en) * 2004-02-27 2006-09-13 株式会社ケーヒン Electromagnetic fuel injection valve and manufacturing method thereof
JP2006090266A (en) * 2004-09-27 2006-04-06 Keihin Corp Solenoid fuel injection valve
JP4577654B2 (en) * 2005-02-10 2010-11-10 株式会社デンソー Electromagnetic drive device and fuel injection valve using the same
JP4790441B2 (en) * 2006-02-17 2011-10-12 日立オートモティブシステムズ株式会社 Electromagnetic fuel injection valve and method of assembling the same
JP4420102B2 (en) * 2007-10-30 2010-02-24 株式会社デンソー injector
JP5014090B2 (en) * 2007-11-28 2012-08-29 株式会社ケーヒン Electromagnetic fuel injection valve and manufacturing method thereof
JP4985636B2 (en) * 2008-12-24 2012-07-25 株式会社デンソー Fuel injection valve
JP5011320B2 (en) * 2009-01-30 2012-08-29 日立オートモティブシステムズ株式会社 Method for forming nozzle body of fuel injection valve
JP5152035B2 (en) * 2009-02-27 2013-02-27 株式会社デンソー Fuel injection valve
JP4935882B2 (en) * 2009-03-05 2012-05-23 株式会社デンソー Fuel injection valve
CN101539084B (en) * 2009-03-20 2010-12-29 天津大学 Common rail electronic control jet apparatus
JP2011208530A (en) * 2010-03-29 2011-10-20 Keihin Corp Electromagnetic fuel injection valve and method of manufacturing the same

Also Published As

Publication number Publication date
JP2015232334A (en) 2015-12-24

Similar Documents

Publication Publication Date Title
US10400723B2 (en) Fuel injection valve
JP4591593B2 (en) Fuel injection valve
US7571891B2 (en) Solenoid valve
JP4790441B2 (en) Electromagnetic fuel injection valve and method of assembling the same
EP2570648B1 (en) Electromagnetic fuel-injection valve
JP4935882B2 (en) Fuel injection valve
WO2014188765A1 (en) Fuel injection valve
US7753337B2 (en) Fluid injection valve
US9297471B2 (en) Solenoid valve
JP5239965B2 (en) Fuel injection valve
JP4483940B2 (en) Fuel injection valve
US8931718B2 (en) Valve assembly for an injection valve and injection valve
JP2008031853A (en) Fuel injection valve
KR20120092189A (en) Valve assembly for an injection valve and injection valve
US20130075501A1 (en) Fuel injector
EP2527637A1 (en) Injector for injecting fluid
EP1801409A1 (en) Fuel injector
DE102005031881A1 (en) Fuel injection valve
JP5814538B2 (en) Solenoid valve for injector control or pressure adjustment of fuel high pressure accumulator
JP6082467B2 (en) Injection valve
JP5627623B2 (en) Method for manufacturing a fixed magnetic circuit element
JP2012097728A (en) Fuel injection valve
JP2013104340A (en) Electromagnetic fuel injection valve
JP2010084552A (en) Solenoid type fuel injection valve
US9605634B2 (en) Fuel injection valve

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150928

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160705

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160902

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20170214

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170413

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20170704

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20170717

R151 Written notification of patent or utility model registration

Ref document number: 6187563

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151