CN110546375B - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
- Publication number
- CN110546375B CN110546375B CN201780089802.6A CN201780089802A CN110546375B CN 110546375 B CN110546375 B CN 110546375B CN 201780089802 A CN201780089802 A CN 201780089802A CN 110546375 B CN110546375 B CN 110546375B
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- China
- Prior art keywords
- turning
- fuel
- wall surface
- fuel injection
- injection valve
- Prior art date
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- 239000000446 fuel Substances 0.000 title claims abstract description 148
- 238000002347 injection Methods 0.000 title claims abstract description 95
- 239000007924 injection Substances 0.000 title claims abstract description 95
- 238000011144 upstream manufacturing Methods 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract description 12
- 238000000889 atomisation Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The fuel injection valve (1) has a turning portion (15) and a turning passage (16) inside a cavity formed at the tip end portion thereof, the turning portion (15) turns the fuel flowing into each nozzle hole (12), and the turning passage (16) introduces the fuel into the turning portion (15). The passage width (W) of the turning passages (16) is increased toward the downstream side, and two turning sections (15) are connected to both ends of the downstream end of one turning passage (16) in the passage width (W) direction at intervals from each other. With the above configuration, the fuel flows out along the first wall surface (16a) and the second wall surface (16b) of the turning passage (16) in the radial direction with the center (Z) of the valve seat opening (10b) as a base point, and is efficiently rectified, so that a uniform turning flow can be generated by the turning part (15), and atomization of the spray can be realized.
Description
Technical Field
The present invention relates to a fuel injection valve for supplying fuel to an internal combustion engine of an automobile or the like, and more particularly to a fuel injection valve for promoting atomization in spray characteristics.
Background
In recent years, in the process of strengthening the exhaust emission control of an internal combustion engine of an automobile, it has been required to atomize a fuel spray injected from a fuel injection valve. As one method of atomizing the spray, a technique of forming a swirling flow by applying a swirling force to the fuel flowing into each nozzle hole is known, and various studies are being made.
For example, in reference 1, there is disclosed a fuel injection valve including a rotation passage provided on the downstream side of an opening of a valve seat, a rotation chamber formed on the downstream side of the rotation passage and rotating fuel therein, and an injection hole provided in the bottom of the rotation chamber. In the above-described conventional example, two turning chambers are provided adjacently at the downstream side end of one turning passage, and the starting point (upstream end) of each turning chamber is located on the central axis of the turning passage.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-142323
Disclosure of Invention
Technical problem to be solved by the invention
Conventionally, an injection hole plate of a fuel injection valve is manufactured by press working suitable for mass production, electric discharge machining which relatively does not apply stress, etching, and the like, however, if a turning passage and a turning chamber are formed in the injection hole plate in accordance with the number of injection holes, in recent years, there is a tendency to form a plurality of injection holes, and complicated and highly precise machining is required, which causes a problem of increasing cost.
In patent document 1, since one rotation passage corresponds to two rotation chambers, the number of rotation passages is reduced. However, since the width of the turning passage is constant with respect to the two turning chambers and the turning chambers are provided such that the starting points (upstream ends) of the two turning chambers are located on the central axis of the turning passage, the two turning chambers and the nozzle holes approach each other, and the fuels injected from the two nozzle holes interfere with each other in a liquid film state, thereby causing a problem that atomization of the spray is deteriorated.
In view of the above problems, an object of the present invention is to provide a fuel injection valve capable of forming a swirling flow of fuel with a simple structure that is easy to process, and atomizing spray.
Technical scheme for solving technical problem
The fuel injection valve of the present invention includes a valve seat, a valve element, and an orifice plate, the valve seat having an opening portion on a downstream side, the valve element being provided slidably to open and close the valve seat, the orifice plate being fixed to a downstream-side end surface of the valve seat, the orifice plate having a plurality of orifices penetrating in a plate thickness direction, a turning portion and a turning passage being provided inside a cavity formed between the downstream-side end surface of the valve seat and an upstream-side end surface of the orifice plate, the turning portion turning fuel flowing into each of the orifices, an upstream-side end portion of the turning passage communicating with the opening portion of the valve seat and introducing the fuel into the turning portion, a passage width of the turning passage being widened toward the downstream side, and two turning portions being connected to both ends of a downstream-side end portion of one turning passage at an interval from each other.
Effects of the invention
According to the fuel injection valve of the present invention, since the two turning portions are disposed at both ends in the passage width direction of the downstream end portion of one turning passage, the turning passage and the turning portions have simple structures and are easy to machine. Further, by increasing the passage width of the turning passage toward the downstream side, the fuel flows out along the wall surfaces on both sides of the turning passage in the radial direction with the center of the opening of the valve seat as a base point, and is further efficiently rectified. Further, since the distance between the two injection holes can be secured, the fuel does not interfere with the liquid film, and atomization of the spray is favorable.
Objects, features, aspects and effects of the present invention other than those described above will become apparent from the following detailed description of the present invention with reference to the accompanying drawings.
Drawings
Fig. 1 is a sectional view showing the overall structure of a fuel injection valve according to a first embodiment of the present invention.
Fig. 2 is a partially enlarged cross-sectional view showing a tip end portion of a fuel injection valve according to a first embodiment of the present invention.
Fig. 3 is a partial plan view showing a tip end portion of a fuel injection valve according to a first embodiment of the present invention.
Fig. 4 is a diagram illustrating a structure of a tip end portion of a fuel injection valve according to a first embodiment of the present invention.
Fig. 5 is a diagram illustrating the flow of fuel at the tip end portion of the fuel injection valve according to the first embodiment of the present invention.
Fig. 6 is a diagram illustrating a configuration of a tip end portion of a fuel injection valve according to a second embodiment of the present invention.
Fig. 7 is a diagram illustrating the flow of fuel at the tip end portion of the fuel injection valve according to the second embodiment of the present invention.
Fig. 8 is a diagram showing a modification of the tip end portion of the fuel injection valve according to the second embodiment of the present invention.
Fig. 9 is a plan view showing a tip end portion of a fuel injection valve according to a third embodiment of the present invention.
Fig. 10 is a partially enlarged cross-sectional view showing a tip end portion of a fuel injection valve according to a third embodiment of the present invention.
Fig. 11 is a plan view showing a modification of the tip end portion of the fuel injection valve according to the third embodiment of the present invention.
Fig. 12 is a plan view showing a tip end portion of a fuel injection valve according to a fourth embodiment of the present invention.
Fig. 13 is a partially enlarged cross-sectional view showing a tip end portion of a fuel injection valve according to a fourth embodiment of the present invention.
Fig. 14 is a diagram illustrating a structure of a tip end portion of a fuel injection valve in a comparative example of the present invention.
Detailed Description
Implementation mode one
Hereinafter, a fuel injection valve according to a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a sectional view showing the entire structure of a fuel injection valve according to a first embodiment, fig. 2 is a partially enlarged sectional view showing a tip end portion of the fuel injection valve according to the first embodiment, and fig. 3 is a partial plan view of a portion shown by a-a in fig. 2 as viewed from an upstream side. In the drawings, the same or corresponding portions in the drawings are denoted by the same reference numerals.
The fuel injection valve 1 includes a solenoid device 2 that generates electromagnetic force, and a valve device 7 that operates by energizing the solenoid device 2. The electromagnetic device 2 includes a housing 3 serving as a yoke portion of a magnetic circuit, a core 4 serving as a fixed core portion of the magnetic circuit, a coil 5 provided to surround the core 4, and an armature 6 serving as a movable core portion of the magnetic circuit.
The valve device 7 includes a valve element 8, a valve main body 9, and a valve seat 10. The valve main body 9 having a cylindrical shape is press-fitted into the outer diameter portion of the front end of the core 4 and then welded. A valve element 8 provided slidably and having a compression spring 14 connected to the upstream side opens and closes the valve seat 10. The valve element 8 has a ball 13 fixed by welding to the tip end of a hollow rod press-fitted and welded to the inner surface of the armature 6. The spherical body 13 has a chamfered portion 13a parallel to the central axis Z of the fuel injection valve 1.
The valve seat 10 is provided in the middle of a passage through which fuel flows in the valve main body 9, and the valve seat 10 includes a seat portion 10a abutting against the ball 13 and a seat opening portion 10b, which is an opening portion located on the downstream side of the seat portion 10a, as shown in fig. 2. Further, an injection hole plate 11 is welded to a downstream end surface of the valve seat 10. The orifice plate 11 has a plurality of orifices 12 penetrating in the plate thickness direction.
Next, the operation will be described. When an operation signal is transmitted from an engine control device to a drive circuit of the fuel injection valve 1, a current is passed to the coil 5 of the fuel injection valve 1, and a magnetic flux is generated in a magnetic circuit including the armature 6, the core 4, the case 3, and the valve main body 9. Thus, when the armature 6 is operated so as to be attracted to the core 4 side and the valve element 8, which is a structure integrated with the armature 6, is separated from the seat portion 10a to form a gap, the fuel is injected from the plurality of injection holes 12 to the engine intake passage through the gap between the seat portion 10a and the ball 13 from the chamfered portion 13a of the ball 13 welded to the tip end portion of the valve element 8.
When a stop signal for operation is transmitted from the engine control device to the drive circuit of the fuel injection valve 1, the energization of the coil 5 is stopped, the magnetic flux in the magnetic circuit is reduced, and the valve element 8 and the valve seat portion 10 are closed by the compression spring 14 that presses the valve element 8 in the valve closing direction, and the fuel injection is completed. The valve body 8 slides on the armature 6 at the guide portion 6a of the valve body 9, and the upper surface 6b of the armature 6 abuts on the lower surface of the core 4 in the valve-opened state.
The structure of the tip end portion of the fuel injection valve 1 according to the first embodiment will be described in detail with reference to fig. 2 to 4. The tip end portion of the fuel injection valve 1 has a cavity formed between the downstream end surface of the valve seat 10 and the upstream end surface 11a of the injection hole plate 11. In the first embodiment, the cavity is formed by a recess provided on the upstream end surface 11a of the orifice plate 11.
As shown in fig. 3, a turning portion 15 and a turning passage 16 are provided in the hollow, the turning portion 15 turning the fuel flowing into each nozzle hole 12 to apply a turning force to the fuel, and the turning passage 16 introducing the fuel into the turning portion 15. At the bottom of the turning portion 15, an injection hole 12 for injecting fuel to the outside (engine intake passage) is opened. The upstream end of the turning passage 16 communicates with the valve seat opening 10b, and the downstream end communicates with the turning portion 15.
As shown in fig. 4, the passage width W of the turning passage 16 is increased toward the downstream side, and two turning portions 15 are connected to both ends of the downstream end portion of one turning passage 16 in the passage width W direction at intervals.
If two turning portions 15 connected to one turning passage 16 are respectively provided as the first turning portion 15a and the second turning portion 15b, the turning passage 16 has a first wall surface 16a, a second wall surface 16b, and a third wall surface 16c, wherein the first wall surface 16a is connected to the inner peripheral wall surface of the first turning portion 15a, the second wall surface 16b is connected to the inner peripheral wall surface of the second turning portion 15b, and the third wall surface 16c is connected to the inner peripheral wall surface of the first turning portion 15a and the inner peripheral wall surface of the second turning portion 15 b.
The third wall surface 16c is a wall surface provided between a point P1 on the virtual circumference of the first turning part 15a and a point P2 on the virtual circumference of the second turning part 15b, and in the first embodiment, the third wall surface 16c is curved so as to be recessed inward of the turning passage 16. The positions of P1 and P2 are not limited to those shown in fig. 4.
The first turning portion 15a and the second turning portion 15b (collectively referred to as the turning portion 15) are disposed so that a part of the inner peripheral wall surface protrudes from the first wall surface 16a and the second wall surface 16b of the turning passage 16. In the example shown in fig. 4, the center of the injection hole 12 is arranged to coincide with the center of the turning portion 15, but the center of the injection hole 12 may be arranged to be shifted from the center of the turning portion 15.
The turning passage 16 is arranged such that the passage width increases toward the downstream side. The angle formed by the first wall surface 16a and the second wall surface 16b of the turning passage 16 is determined by the following method. As shown in fig. 4, in the region surrounded by one turning passage 16 and the turning portion 15, a tangent T parallel to the wall surface of the turning passage 16 on the side close to each turning portion 15 is drawn with respect to the virtual circumference of each turning portion 15. That is, a tangent T1 parallel to the first wall surface 16a is drawn to the first turning portion 15a, and a tangent T2 parallel to the second wall surface 16b is drawn to the second turning portion 15 b. Thereby, two virtual turning passages 161 and 162 are drawn.
Further, the angle formed by the first wall surface 16a and the second wall surface 16b of the turning passage 16 is adjusted so that a center line L1 (or a center line L2) that bisects the space between the first wall surface 16a (or the second wall surface 16b) and the tangent T1 (or the tangent T2) of the turning passage 16 passes through the center Z of the valve seat opening 10 b. By adjusting the angle, the direction of radiation from the center Z of the valve seat opening 10b can be made to coincide with the direction of the center line L1 (or the center line L2) of the turning passage 161 (or the turning passage 162) virtually drawn, and the fuel flow shown in fig. 5 can be realized.
In fig. 5, an arrow f shows the fuel flow at the front end portion of the fuel injection valve 1. The fuel flows out along the first wall surface 16a and the second wall surface 16b of the turning passage 16 in a radial direction with the center Z of the valve seat opening 10b as a base point. As a result, the fuel flow f is efficiently rectified, and the fuel flow f does not directly flow toward the nozzle hole 12, but a uniform swirling flow is generated by the swirling portion 15.
In addition, in the first embodiment, the third curved wall surface 16c is provided between the two turning portions 15, thereby facilitating the branching of the fuel flow f toward the two turning portions 15 and reducing the dead volume. The swirling flow at the swirling portion 15 is retained inside the nozzle hole 12, and forms a thin liquid film along the inner wall of the nozzle hole 12. The thin liquid film is ejected from the nozzle hole 12, thereby forming a hollow conical spray.
Fig. 14 shows a configuration of a tip end portion of a fuel injection valve in a comparative example of the first embodiment. In this comparative example, the first turning portion 25a and the second turning portion 25b are provided at the downstream end of one turning passage 26, but the width of the turning passage 26 is wide and constant. As described above, in the case where the turning passage 26 is virtually divided into two by the central axis Z in order to efficiently rectify the fuel flow f, it is preferable that the center lines L1, L2 of the turning passages 26 extend radially from the center Z of the valve seat opening 20b, but in the comparative example shown in fig. 14, the center lines L1, L2 of the turning passages do not intersect with the center Z of the valve seat opening 20 b.
In this comparative example, the flow f does not follow the first wall surface 26a and the second wall surface 26b on both sides of the turning passage 26, and therefore, the flow is not easily rectified. Therefore, the fuel is likely to flow directly into the nozzle hole 22 without generating a swirling flow, and atomization of the spray is inhibited due to insufficient swirling force.
As described above, according to the fuel injection valve 1 of the first embodiment, since the two turning portions 15 are arranged at the both ends of the downstream end portion of the one turning passage 16 in the passage width W direction with a gap therebetween, the number of turning passages can be reduced as compared with a case where the turning passages and the turning portions are provided in a one-to-one manner. Therefore, the turning passage 16 and the turning portion 15 are configured to have a simple structure, a high degree of freedom in design, and easy machining.
Further, by widening the passage width W of the turning passage 16 toward the downstream side, the fuel flows out in the radial direction from the center Z of the valve seat opening 10b along the first wall surface 16a and the second wall surface 16b on both sides of the turning passage 16, and therefore, can be efficiently rectified. This enables the swirling portion 15 to generate a uniform swirling flow, thereby atomizing the spray ejected from the nozzle hole 12. Further, since the distance between the two injection holes 12 can be secured, the fuel does not interfere with the liquid film, and atomization of the spray is favorable.
Second embodiment
The structure of the tip end portion of the fuel injection valve according to the second embodiment of the present invention will be described with reference to fig. 6 and 7. The overall configuration of the fuel injection valve 1 of the second embodiment is the same as that of the first embodiment, and therefore, the explanation of each part is omitted along with fig. 1. In the first embodiment, the three wall surface 16c between the first and second turning portions 15a and 15b is curved so as to be recessed inward of the turning passage 16, but the third wall surface 16d of the fuel injection valve 1 of the second embodiment is a plane that overlaps a tangent line common to the first and second turning portions 15a and 15 b.
As shown in fig. 6, the third wall surface 16d linearly connects a point P3 on the imaginary circumference of the first turning part 15a and a point P4 on the imaginary circumference of the second turning part 15 b. Therefore, the inner peripheral wall surfaces of the first and second turnarounds 15a and 15b shown in fig. 6 are shortened by D1 and D2, as compared with the first embodiment (fig. 4). In the second embodiment, the angle formed by the first wall surface 16a and the second wall surface 16b of the turning passage 16 is determined by the same method as in the first embodiment.
The flow of fuel at the tip end portion of the fuel injection valve 1 according to the second embodiment of the present invention will be described with reference to fig. 7. The fuel stagnation portion 163 shown by hatching in fig. 7 is located between the two imaginary turning passages 161 and 162, and the fuel flow f is a stagnation region. Even if the third wall surface 16d is not curved, the fuel flow f is separated and directed to the two turning portions 15 by the fuel stagnation portion 163, and thus a turning flow is generated.
Fig. 8 shows a modification of the tip end portion of the fuel injection valve according to the second embodiment. Fig. 6 and 7 show an example in which the number of the injection holes 12 is four, but as shown in fig. 8, the number of the injection holes 12 may be eight. The number of the injection holes 12 is not limited to four and eight.
According to the second embodiment, in addition to the same effects as those of the first embodiment, the third wall surface 16d is made flat, thereby providing better workability and layout than those of the first embodiment. Therefore, the number of the injection holes can be easily increased, and the injection amount can be increased by a large amount, which is difficult to be achieved by the conventional structure.
Third embodiment
Fig. 9 is a plan view showing a tip end portion of a fuel injection valve according to a third embodiment of the present invention, fig. 10 is a partially enlarged sectional view of a portion shown by B-B in fig. 9 as viewed in the direction of an arrow, and fig. 11 is a plan view showing a modification of the tip end portion of the fuel injection valve according to the third embodiment. Since the overall configuration of the fuel injection valve 1 of the third embodiment is the same as that of the first embodiment, the explanation of each part will be omitted with reference to fig. 1.
In the third embodiment, the fuel branching block 19 for controlling the flow of the fuel is disposed inside the cylindrical cavity 18, thereby forming the turning portion 15 and the turning passage 16. In the example shown in fig. 9, four fuel branching blocks 19 are radially arranged in the cavity 18 at positions on the outer periphery side of the valve seat opening 10b with respect to the eight injection holes 12.
As shown in fig. 10, the cavity 18 is formed by a recess provided on the upstream end surface 11a of the injection hole plate 11, and the fuel branching block 19 is formed integrally with the injection hole plate 11. The fuel branching block 19 has a turning passage forming surface 19a as a wall surface of the turning passage 16 and a turning portion forming surface 19b as a wall surface of the turning portion 15. The fuel branching block 19 is symmetrical with respect to a straight line radially drawn from the center Z of the valve seat opening 10 b.
The turning passage 16 is formed by facing turning passage forming surfaces 19a of two adjacent fuel branching blocks 19. The passage width W of the turning passage 16 is increased toward the downstream side (W1 < W2), and two turning portions 15 are arranged at both ends of the downstream end of one turning passage 16 in the passage width W direction with a gap therebetween. The turn portion 15 is formed by a turn portion forming surface 19b of the fuel branching block 19 and a wall surface of the cavity 18.
In the third embodiment, the angle formed by the turning passage forming surfaces 19a of the two adjacent fuel branching blocks 19 is determined by the same method as in the first embodiment. That is, as shown in fig. 9, in the region surrounded by the two adjacent fuel branching blocks 19 and the inner wall of the cavity 18, a tangent T1 parallel to the turning passage forming surface 19a of one of the fuel branching blocks 19 is drawn with respect to the imaginary circumference of the turning portion 15 formed by the turning portion forming surface 19b of the one of the fuel branching blocks 19. Similarly, a tangent T2 parallel to the turning passage forming surface 19a of the other fuel branching block 19 is drawn on the imaginary circumference of the turning portion 15 formed by the turning portion forming surface 19b of the other fuel branching block 19.
The angle formed by the turning passage forming surfaces 19a of the two adjacent fuel branching blocks 19 is determined so that a center line L1 that bisects a space between the turning passage forming surface 19a of one fuel branching block 19 and the tangent T1 and a center line L2 that bisects a space between the turning passage forming surface 19a of the other fuel branching block 19 and the tangent T2 pass through the center Z of the valve seat opening 10 b.
The turning part forming surface 19b of the fuel branching block 19 shown in fig. 9 is a curved surface, but a rhombic fuel branching block 19A in which both the turning passage forming surface 19A and the turning part forming surface 19b are flat may be used as in the modification shown in fig. 11. Even the fuel branching block 19A having the simple shape described above can generate a swirling flow. Further, the shape of the cavity 18 is not limited to the cylindrical shape.
According to the third embodiment, the fuel branching blocks 19 and 19A are disposed in the cylindrical cavity 18, so that the same swirling flow as in the first and second embodiments can be obtained, and workability is better than in the case where the swirling portion 15 and the swirling passage 16 are formed in the hollow.
Embodiment IV
Fig. 12 is a plan view showing a tip end portion of a fuel injection valve according to a fourth embodiment of the present invention, and fig. 13 is a partially enlarged sectional view of a portion indicated by C-C in fig. 12 as viewed from an arrow direction. The overall configuration of the fuel injection valve 1 of the fourth embodiment is the same as that of the first embodiment, and therefore, the explanation of each part is omitted along with fig. 1. In the fourth embodiment, the fuel branching block 19 is disposed inside the cylindrical cavity 20 to form the turning portion 15 and the turning passage 16, similarly to the third embodiment.
However, the cavity 20 of the fourth embodiment is formed by a recess provided in the downstream end surface 10c of the valve seat 10. The recess is formed by cutting the downstream end surface 10c of the valve seat 10. The fuel branching block 19 is formed by pressing the injection hole plate 11 from the downstream end surface 11b so that the upstream end surface 11a protrudes. Therefore, as shown in fig. 13, the downstream-side end surface 11b of the injection hole plate 11 corresponding to the lower portion of the fuel branching block 19 has a recess. Since the other structures are the same as those of the third embodiment, the description thereof is omitted.
According to the fourth embodiment, in addition to the same effects as those of the third embodiment, since the cavity 20 and the fuel branching block 19 are formed into different members, the respective processing shapes are simple, and the workability is better than that of the third embodiment. In the present invention, the embodiments can be freely combined, or can be appropriately modified or omitted within the scope of the invention.
Description of the symbols
1a fuel injection valve; 2 an electromagnetic device; 3, a shell; 4 a core body; 5, a coil; 6 an armature; 7 a valve device; 8, a valve core; 9a valve body; 10, valve seats; 10a valve seat portion; 10b a valve seat opening part; 10c a downstream side end face; 11, a spray orifice plate; 11a upstream side end face; 11b downstream side end face; 12, spraying holes; 13 spheres; 13a chamfer; 14 a compression spring; 15a turn-around portion; 15a first turning part; 15b a second turning part; 16. 161, 162 turning passages; 16a first wall surface; 16b a second wall surface; 16c, 16d third wall surface; 18. 20 cavities; 19. 19A fuel split block; 19a turning passage forming surface; 19b a turn portion forming surface; 163 stagnation of fuel.
Claims (16)
1. A fuel injection valve comprising a valve seat having an opening portion on a downstream side, a valve element provided slidably to open and close the valve seat, and an orifice plate fixed to a downstream-side end surface of the valve seat and having a plurality of injection holes penetrating in a plate thickness direction, the fuel injection valve being characterized in that,
a turning portion that turns the fuel flowing into each of the injection holes around the injection hole and a turning passage that has an upstream end portion communicating with the opening portion of the valve seat and introduces the fuel into the turning portion are provided inside a cavity formed between the downstream end surface of the valve seat and the upstream end surface of the injection hole plate,
the passage width of the turning passage is increased toward the downstream side, and two turning portions are connected to both ends of the downstream end portion of one turning passage with a gap therebetween.
2. The fuel injection valve according to claim 1,
in a case where two of the turning portions connected to one turning passage are respectively set as a first turning portion and a second turning portion, the turning passage has a first wall surface connected to an inner peripheral wall surface of the first turning portion, a second wall surface connected to an inner peripheral wall surface of the second turning portion, and a third wall surface connecting the inner peripheral wall surface of the first turning portion to the inner peripheral wall surface of the second turning portion.
3. The fuel injection valve according to claim 2,
in a region surrounded by the first turning part, the second turning part, and one of the turning passages, a tangent T1 parallel to the first wall surface is drawn with respect to an imaginary circumference of the first turning part, a tangent T2 parallel to the second wall surface is drawn with respect to an imaginary circumference of the second turning part, and an angle formed by the first wall surface and the second wall surface of the turning passage is determined such that a center line L1 bisecting the space between the first wall surface and the tangent T1 and a center line L2 bisecting the space between the second wall surface and the tangent T2 pass through the center of the opening of the valve seat.
4. The fuel injection valve according to claim 2,
a part of the inner peripheral wall surface of the first turning portion is arranged to protrude from the first wall surface, and a part of the inner peripheral wall surface of the second turning portion is arranged to protrude from the second wall surface.
5. The fuel injection valve according to claim 3,
a part of the inner peripheral wall surface of the first turning portion is arranged to protrude from the first wall surface, and a part of the inner peripheral wall surface of the second turning portion is arranged to protrude from the second wall surface.
6. The fuel injection valve according to any one of claims 2 to 5,
the third wall surface is curved so as to be recessed inward of the turning passage.
7. The fuel injection valve according to any one of claims 2 to 5,
the third wall surface is a plane that coincides with a tangent line common to the first and second rotating portions.
8. The fuel injection valve according to claim 1,
a fuel branching block that controls a flow of fuel is disposed inside the hollow, and the fuel branching block has a turning passage forming surface that is a wall surface of the turning passage and a turning portion forming surface that is a wall surface of the turning portion.
9. The fuel injection valve according to claim 8,
the cavity is cylindrical, and the plurality of fuel branching blocks are radially arranged on the outer circumferential side of the opening of the cavity with respect to the valve seat.
10. The fuel injection valve according to claim 9,
drawing a tangent T1 parallel to the turning passage forming surface of one of the fuel branching blocks with respect to an imaginary circumference of the turning part formed by the turning part forming surface of the one of the fuel branching blocks, drawing a tangent T2 parallel to the turning passage forming surface of the other of the fuel branching blocks with respect to an imaginary circumference of the turning part formed by the turning part forming surface of the other of the fuel branching blocks, and determining an angle formed by the turning passage forming surfaces of the two adjacent fuel branching blocks so that a center line L1 bisecting the turning passage forming surface of the one of the fuel branching blocks and the tangent T1 and a center line L2 bisecting the turning passage forming surface of the other of the fuel branching blocks and the tangent T2 pass through A center of the opening portion of the valve seat.
11. The fuel injection valve according to any one of claims 8 to 10,
the fuel branching block is formed integrally with the injection hole plate.
12. The fuel injection valve according to any one of claims 1 to 5, 8 to 10,
the cavity is formed by a recess provided on an upstream end surface of the orifice plate.
13. The fuel injection valve according to any one of claims 8 to 10,
the cavity is formed by a recess provided in a downstream end surface of the valve seat, and the fuel branching block is provided in the upstream end surface of the orifice plate.
14. The fuel injection valve according to claim 11,
the cavity is formed by a recess provided in a downstream end surface of the valve seat, and the fuel branching block is provided in the upstream end surface of the orifice plate.
15. The fuel injection valve according to claim 13,
the downstream end surface of the orifice plate corresponding to the lower portion of the fuel branching block has a depression.
16. The fuel injection valve according to claim 14,
the downstream end surface of the orifice plate corresponding to the lower portion of the fuel branching block has a depression.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2017/016483 WO2018198216A1 (en) | 2017-04-26 | 2017-04-26 | Fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110546375A CN110546375A (en) | 2019-12-06 |
| CN110546375B true CN110546375B (en) | 2021-11-23 |
Family
ID=63920306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780089802.6A Expired - Fee Related CN110546375B (en) | 2017-04-26 | 2017-04-26 | Fuel injection valve |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6735913B2 (en) |
| CN (1) | CN110546375B (en) |
| PH (1) | PH12019502387A1 (en) |
| WO (1) | WO2018198216A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004008951A (en) * | 2002-06-07 | 2004-01-15 | Mitani Valve Co Ltd | Ejection button |
| CN1151336C (en) * | 1997-06-07 | 2004-05-26 | 罗伯特·博施有限公司 | Method for producing perforated disc for injector valve, perforated disc for injector valve and injector valve |
| CN101929410A (en) * | 2009-06-18 | 2010-12-29 | 日立汽车系统株式会社 | Fuelinjection nozzle |
| CN103206328A (en) * | 2012-01-11 | 2013-07-17 | 日立汽车系统株式会社 | Fuel injection valve |
| JP2014047665A (en) * | 2012-08-30 | 2014-03-17 | Toyota Motor Corp | Fuel injection valve |
| CN104736835A (en) * | 2012-10-23 | 2015-06-24 | 三菱电机株式会社 | Fuel injection valve |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPO080496A0 (en) * | 1996-07-03 | 1996-07-25 | Exell Trading Pty Limited | Nozzle assembly for a spray head |
| US6899290B2 (en) * | 2002-06-24 | 2005-05-31 | Delphi Technologies, Inc. | Fuel swirler plate for a fuel injector |
| US7306172B2 (en) * | 2003-10-27 | 2007-12-11 | Siemens Vdo Automotive Corporation | Fluidic flow controller orifice disc with dual-flow divider for fuel injector |
| DE102012211665A1 (en) * | 2011-08-18 | 2013-02-21 | Robert Bosch Gmbh | Valve for a flowing fluid |
-
2017
- 2017-04-26 WO PCT/JP2017/016483 patent/WO2018198216A1/en active Application Filing
- 2017-04-26 CN CN201780089802.6A patent/CN110546375B/en not_active Expired - Fee Related
- 2017-04-26 JP JP2019514938A patent/JP6735913B2/en not_active Expired - Fee Related
-
2019
- 2019-10-21 PH PH12019502387A patent/PH12019502387A1/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151336C (en) * | 1997-06-07 | 2004-05-26 | 罗伯特·博施有限公司 | Method for producing perforated disc for injector valve, perforated disc for injector valve and injector valve |
| JP2004008951A (en) * | 2002-06-07 | 2004-01-15 | Mitani Valve Co Ltd | Ejection button |
| CN101929410A (en) * | 2009-06-18 | 2010-12-29 | 日立汽车系统株式会社 | Fuelinjection nozzle |
| CN103206328A (en) * | 2012-01-11 | 2013-07-17 | 日立汽车系统株式会社 | Fuel injection valve |
| JP2014047665A (en) * | 2012-08-30 | 2014-03-17 | Toyota Motor Corp | Fuel injection valve |
| CN104736835A (en) * | 2012-10-23 | 2015-06-24 | 三菱电机株式会社 | Fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6735913B2 (en) | 2020-08-05 |
| CN110546375A (en) | 2019-12-06 |
| WO2018198216A1 (en) | 2018-11-01 |
| PH12019502387A1 (en) | 2020-07-13 |
| JPWO2018198216A1 (en) | 2019-11-07 |
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Granted publication date: 20211123 |