CN110537015B - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
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- CN110537015B CN110537015B CN201780089641.0A CN201780089641A CN110537015B CN 110537015 B CN110537015 B CN 110537015B CN 201780089641 A CN201780089641 A CN 201780089641A CN 110537015 B CN110537015 B CN 110537015B
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- Prior art keywords
- fuel
- center
- injection valve
- chamber
- injection hole
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- 239000000446 fuel Substances 0.000 title claims abstract description 169
- 238000002347 injection Methods 0.000 title claims abstract description 143
- 239000007924 injection Substances 0.000 title claims abstract description 143
- 238000000889 atomisation Methods 0.000 abstract description 13
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 230000001154 acute effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Provided is a fuel injection valve for an internal combustion engine, which can promote atomization of injected fuel. A plurality of swirl chambers (17) and branch flow paths (18) before reaching the swirl chambers (17) are provided on the upper surface of the injection hole plate (13) via a recess having a flat bottom surface. Further, a nozzle hole (14) is provided so as to be inclined with respect to the axis from the bottom surface of the swirl chamber (17) orthogonal to the axis. An inlet center (14a) of the injection hole (14) is disposed offset from a revolution center (17a) of the fuel in the revolution chamber (17), and an outlet center (14b) of the injection hole (14) is disposed near the revolution center (17 a).
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.
Background
In recent years, exhaust gas regulation of internal combustion engines of automobiles and the like has been intensified, atomization of spray fuel injected from a fuel injection valve has been demanded, and various methods for achieving atomization by a swirling flow have been discussed.
In the prior art, the following are provided: when fuel is injected in a direction inclined with respect to the central axis of the fuel injection valve, a plate-shaped member having a fuel injection hole is provided on the downstream side of a valve seat with which a valve element is in contact and separated, and the bottom surface of the rotation chamber is perpendicular to the injection direction of the fuel (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2015-16901984
Disclosure of Invention
Technical problem to be solved by the invention
The conventional fuel injection valve has the following structure: the bottom surface of the turning chamber needs to be formed to be inclined with respect to a plane perpendicular to the axis, and the difficulty of processing is high as compared with the case where the bottom surface of the turning chamber is formed to be perpendicular to the axis, and the productivity may be low.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuel injection valve which has good fuel injection characteristics and high productivity when injecting fuel in a direction inclined with respect to an axis of the fuel injection valve.
Technical scheme for solving technical problem
The fuel injection valve of the present invention includes: a fuel supply unit that supplies fuel in an axial direction of the flow path; and an orifice plate that is provided downstream of the fuel supply unit, that branches the fuel supplied from the fuel supply unit in a plurality of directions within a plane orthogonal to the axis, that guides the fuel to a rotation chamber that applies a rotational force to the fuel, and that injects the fuel from an orifice that passes through a bottom surface of the rotation chamber orthogonal to the axis and is inclined with respect to the axis, wherein, of the orifice, a center of an inlet portion into which the fuel flows is offset from a rotation center of the fuel in the rotation chamber, and a center of an outlet portion from which the fuel is injected is provided close to the rotation center.
Effects of the invention
According to the fuel injection valve of the present invention, since the bottom surface of the rotation chamber is provided so as to be orthogonal to the axis, the machining is easy, and the center of the outlet portion of the injection hole is offset so as to be close to the rotation center, the thickness of the fuel liquid film flowing down in contact with the inner peripheral surface in the vicinity of the outlet portion of the injection hole can be made uniform in the circumferential direction around the hollow portion of the rotation center of the fuel generated in the injection hole, and the spray characteristics of the fuel can be improved.
Drawings
Fig. 1 is a sectional view in the axial direction of a fuel injection valve according to embodiment 1 of the present invention.
Fig. 2 is a sectional view showing an example in which the fuel injection valve of fig. 1 is disposed in an intake port.
Fig. 3 (a) is an enlarged cross-sectional view of a downstream portion of the fuel injection valve of fig. 1, and fig. 3 (b) is a plan view of line a-a of fig. 3 (a).
Fig. 4 is an enlarged plan view of a branch flow path of the nozzle plate shown in fig. 3 (b).
Fig. 5 (a) is an enlarged view of the region a1 of fig. 4, and fig. 5 (B) is a cross-sectional view taken along line B-B of fig. 5 (a).
Fig. 6 (a) is an enlarged view showing the fuel flow of the region a1 of fig. 4, and fig. 6 (b) is a cross-sectional view taken along line C-C of fig. 6 (a).
Fig. 7 is an enlarged view of the area a2 of fig. 4.
Fig. 8 is a main part sectional view showing a fuel injection valve according to embodiment 2 of the present invention.
Fig. 9 is a plan view showing an H-shaped branched flow passage of the fuel injection valve according to embodiment 3 of the present invention.
Fig. 10 is a plan view showing an I-shaped branched flow passage of a fuel injection valve according to embodiment 4 of the present invention.
Fig. 11 is a plan view showing an X-shaped branched flow passage of the fuel injection valve according to embodiment 5 of the present invention.
Fig. 12 (a) is an enlarged plan view of a rotation chamber of a fuel injection valve of a comparative example, and fig. 12 (b) is a cross-sectional view taken along line D-D of fig. 12 (a).
Detailed Description
Hereinafter, a fuel injection valve 1 according to embodiment 1 of the present invention will be described with reference to fig. 1 to 7.
Fig. 1 is a sectional view of the fuel injection valve 1 in the axial (central axis) direction, and fig. 2 is a sectional view of the intake port 22 through which the fuel injected from the fuel injection valve 1 is atomized and diffused.
As shown in fig. 1, the fuel injection valve 1 of the present invention supplies fuel in the axial direction from a fuel supply portion 1a located at an upstream portion with respect to an injection hole plate 13 located at a downstream portion. The injection hole plate 13 is configured to branch into a plurality of fuel flow paths, and inject fuel in a plurality of directions, for example, two directions, as shown in fig. 2.
The fuel injection valve 1 will be described in more detail below.
As shown in fig. 1, a fuel injection valve 1 according to embodiment 1 of the present invention mainly includes: a solenoid device 4, a housing 5 as a yoke portion of the magnetic circuit, a core 6 as a fixed core portion of the magnetic circuit, a coil 7, an armature 8 as a movable core portion of the magnetic circuit, and a valve device 9. The valve device 9 is composed of a valve element 10, a valve body 11, and a valve seat 12. The valve main body 11 is press-fitted to the outer diameter of the core 6 and then welded, and the armature 8 is press-fitted to the valve body 10 and then welded. The orifice plate 13 is coupled to the valve seat 12. The fuel supply portion 1a is a fuel flow path before the fuel injection valve 1 reaches the orifice plate 13. A plurality of injection holes 14 (fuel injection holes) are provided in the injection hole plate 13 so as to penetrate in the plate thickness direction.
Next, the operation of the fuel injection valve 1 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 through the coil 7, and a magnetic flux is generated in a magnetic circuit formed by the armature 8, the core 6, the case 5, and the valve main body 11. When the armature 8 is attracted toward the core portion 6 by the magnetic flux and the valve element 10 integrally structured with the armature 8 is opened from the valve seat base portion to form a gap (opened state), fuel is injected into the engine intake passage through the plurality of injection holes 14 from the chamfered portion 15a of the ball 15 welded to the tip end portion of the valve element 10 through the gap between the valve seat 12 and the valve element 10.
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 current in the coil 7 is stopped, the magnetic flux in the magnetic circuit decreases, and the gap between the valve element 10 and the valve seat 12 is closed (the valve-closed state is achieved) by the compression spring 16 that presses the valve element 10 in the valve-closing direction. When the valve is closed, the fuel injection is ended.
Since the valve element 10 is integrated with the armature 8, the armature outer surface portion 8a slides on the guide portion of the valve body 11 in accordance with the opening and closing operation of the valve, and the armature upper surface portion 8b abuts on the lower surface of the core portion 6 in the valve-opened state.
As shown in fig. 2, the fuel injection valve 1 according to embodiment 1 of the present invention is mounted on the upstream side of a position where an intake port 22 for introducing intake air into an internal combustion engine is bifurcated. An intake valve 23 is provided on the downstream side of the bifurcated intake port 22, and the sprayed fuel 21 is injected from the plurality of injection holes 14 provided in one injection hole plate 13 to the two intake valves 23 provided separately.
Fig. 3 (a) shows an enlarged cross-sectional view of the valve seat 12 and the injection hole plate 13 of the downstream portion of the fuel injection valve of fig. 1, and fig. 3 (b) shows a plan view of the branch flow path 18 of the injection hole plate 13, which is arranged in a cross shape, along the line a-a of fig. 3 (a). The center of the valve seat opening 12b, which is the opening end of the valve seat 12, is disposed so as to be aligned with the center position of the cross-shaped branch flow path 18 of the injection hole plate 13.
Fig. 4 is an enlarged plan view of the branch flow path of the injection hole plate 13 shown in fig. 3 (b).
As shown in fig. 3 and 4, a plurality of turning chambers 17 for applying turning force to the fuel and branch flow paths 18 for introducing the fuel into the turning chambers 17 are formed in the region where the upstream end surface of the injection hole plate 13 is recessed by a predetermined depth to form a recess. The bottom surface of the turning chamber 17 and the bottom surface of the branch flow passage 18 are provided so as to be perpendicular to the central axis of the fuel injection valve 1.
The injection hole 14 is provided so as to be inclined in either one of two directions which are the injection directions of the fuel inclined with respect to the axis of the fuel injection valve 1. In a plane perpendicular to the axis, the inlet portions of the injection holes 14 are provided so as to be offset in a direction opposite to the direction of inclination from the inlet portions to the outlet portions of the injection holes 14 with respect to the center of the swirl chamber 17 (the center of rotation 17a of the fuel). In fig. 4, in the turning chamber forming portion indicated by the region a1 and the region a4, the inlet portions of the injection holes 14 are offset from the center position of turning to the right side of the paper surface and inject the fuel to the left side of the paper surface, and in the turning chamber forming portion indicated by the region a2 and the region A3, the inlet portions of the injection holes 14 are offset from the center position of turning of the fuel to the left side of the paper surface and inject the fuel to the right side of the paper surface.
That is, the offset direction of the inlet portions of two injection holes 14 out of the four injection holes 14 provided in the injection hole plate 13 is set to be parallel to the introduction direction of the fuel into the branch flow path 18 before reaching the swirl chamber 17, and the offset direction of the inlet portions of the remaining two injection holes 14 is set to be at an angle (for example, at right angles) to the introduction direction of the fuel into the branch flow path 18 before reaching the swirl chamber 17.
As shown in the enlarged view of the region a1 of fig. 4 in fig. 5 (a) and the cross-sectional view of the line B-B of fig. 5 (a) in fig. 5 (B), the inlet centers 14a of the injection holes 14 are offset from each other so that the center position of the swirl chamber 17, i.e., the center of gyration 17a, coincides with the outlet center 14B of the injection hole 14 in the injection hole 14. On the paper surface (in a plane orthogonal to the axial direction), the fuel is introduced from the branch flow path 18 into the rotation chamber 17 in the introduction direction 18a, rotates in the rotation chamber 17, and is injected in the fuel injection direction 21a opposite to the offset direction (the direction from the rotation center 17a toward the inlet center 14a of the injection hole 14) 14 c. In the example of fig. 5, the introduction direction 18a of the branch flow path 18 is orthogonal to the offset direction 14c and the fuel injection direction 21 a.
The rotation chamber 17 is cylindrical, and in this case, the center of the cylinder is defined as the center of the rotation chamber 17 (rotation center 17 a).
In the atomization method of the spray fuel using the swirling flow, the swirling flow is generated with the center of the swirling chamber 17 as a base point. When the swirling flow is generated, a hollow portion where no fuel exists is generated in the axial direction at the center position of the swirling chamber 17. The hollow portion of the fuel is also generated in the same direction inside the injection hole 14, and the fuel that turns around inside the injection hole 14 and becomes a liquid film is present around the hollow portion, and the sprayed fuel injected from the outlet portion of the injection hole 14 becomes a state of being atomized.
However, if the exit center 14b of the nozzle hole 14 is offset from the rotation center 17a without being overlapped with each other, the thickness of the liquid film becomes uneven in the circumferential direction of the nozzle hole 14, and atomization of the fuel is inhibited.
Here, as a comparative example of the fuel injection valve 1 of the present invention, a fuel injection valve having a structure in which the inlet center 140a of the injection hole 140 is not offset, that is, a structure in which the rotation center 17a overlaps the inlet center 140a of the injection hole 140 will be described.
Fig. 12 (a) is a plan view of a main part of a fuel injection valve shown as a comparative example, illustrating a case where an inlet center 140a of an injection hole 140 inclined with respect to an axis coincides with a rotation center 17a of a rotation chamber 17, and fig. 12 (b) shows a D-D cross-sectional view of fig. 12 (a).
As shown in (a) and (b) of fig. 12, although the inlet center 140a of the injection hole 140 coincides with the rotation center, the injection hole 140 is away from the rotation center 17a in the axial direction of the inclined injection hole 140 as it goes toward the outlet portion, and therefore, the thickness of the fuel film formed on the inner periphery of the injection hole 140 at the outlet portion of the injection hole 140 becomes uneven.
In contrast, in the fuel injection valve 1 of the present invention, as shown by the fuel flow 20 centered on the injection hole 14 in the region a1 of fig. 4 shown in fig. 6 (a), the inlet center 14a of the injection hole 14 is offset in the plane perpendicular to the axis with respect to the rotation center 17a of the rotation chamber 17 in the direction opposite to the direction of inclination from the inlet portion to the outlet portion of the injection hole 14, and the outlet center 14b of the injection hole 14 is set close to the rotation center 17a of the rotation chamber 17. As shown in fig. 6 (b), even if the inlet center 14a of the injection hole 14 is offset, the fuel 19 introduced into the swirling chamber 17 swirls around the hollow portion generated at the swirling center 17a of the swirling chamber 17, and the fuel 19 having a swirling force forms a fuel film 19a in such a manner as to swirl around the inner wall of the injection hole 14. The fuel film 19a flows downward in the injection hole 14, and becomes a state of being formed to be thin and uniform in thickness along the inner periphery of the outlet portion of the injection hole 14. By offsetting the inlet center 14a of the injection hole 14, the outlet center 14b of the injection hole 14 can be moved in a direction overlapping the hollow portion generated at the rotation center 17 a. Thus, the hollow portion does not expose the inner wall near the outlet portion of the injection hole 14, so that the fuel film 19a does not peel off at the inner wall near the outlet portion of the injection hole 14, and the atomization characteristics of the injected fuel are good.
It goes without saying that the exit center 14b of the injection hole 14 and the revolution center 17a of the revolution chamber 17 are aligned so that the film thickness of the fuel film at the exit portion can be made uniform in the best state.
Here, the offset of the inlet portion of the injection hole 14 is preferably set so that the rotation center 17a of the rotation chamber 17 is included in the range of the inlet portion of the injection hole 14, and satisfies the relationship "injection hole offset < radius of the injection hole 14 (the cross section of the injection hole 14 is circular)". When the injection hole offset is set to be larger than the above-described injection hole offset, a peeled portion where no liquid film is formed may be generated at the inlet portion of the injection hole 14, and the uniformity of the liquid film thickness at the outlet portion of the injection hole 14 may be lost.
Further, although the example in which the rotation chamber 17 is a cylindrical hollow is shown, it is not limited to the above shape. The center position of the swirling chamber 17 having a shape other than a cylinder is the center position of the swirling flow (the swirling center 17a) at which the swirling flow is generated. In the case of the revolution chamber 17 of a logarithmic spiral shape, the position of the base point of the logarithmic spiral curve is defined as the center of the revolution chamber 17. Further, in the case of a shape of the whirling chamber constituted by a curve having a plurality of curvatures, the center of the curve having the smallest curvature is defined as the center of the whirling chamber 17.
The fuel injection valve 1 according to embodiment 1 described above has a configuration in which the inlet center 14a of the injection hole 14 is offset from the rotation center 17a in consideration of the inclination of the injection hole 14, and therefore, the thickness of the fuel that is made into a liquid film and rotates at the outlet portion of the injection hole 14 can be made uniform, and atomization of the injected fuel can be promoted. Further, the bottom surface of the swirling chamber 17 and the bottom surface of the branched flow path 18 may be formed by digging down a plane perpendicular to the center axis of the fuel injection valve 1, that is, the upper surface of the orifice plate 13 to a certain depth, and thus complicated machining is not required, and productivity is improved.
In fig. 5 and 6, the swirl chamber forming portion of the region a1 in fig. 4 is illustrated, and the fuel flow in the branched flow path 18 and the injected fuel flow are orthogonal to each other in a plane (for example, a paper plane) orthogonal to the axis, and the fuel in the swirl chamber 17 is rotated less than once.
However, as shown in the enlarged plan view of the region a2 in fig. 4 shown in fig. 7, in the turning chamber forming portion of the region a2, the fuel flow is parallel to the injected fuel flow, and the fuel in the turning chamber 17 turns substantially once. As a result, the fuel in the region a2 has a stronger swirling force than the fuel in the region a 1. That is, due to the strength of the swirling force of the fuel generated in the swirling chamber 17, the injection force of the fuel ejected from the injection holes 14 located in the region a2, the region a4 is stronger than the injection force of the fuel ejected from the injection holes 14 located in the region a1, the region A3.
In the region a1 and the region a4, or the region a2 and the region A3, in which the fuel is injected in the same direction, since the swirling force of the fuel is strong and weak, the positions of the fuel spray breakups are different, and the sprayed particles are less likely to interfere with each other, so that the effect of further promoting the atomization of the fuel in the collective spray can be obtained.
Next, a fuel injection valve 1 according to embodiment 2 of the present invention will be described with reference to fig. 8.
In embodiment 1, an example in which the linearly extending injection holes 14 are formed with the same opening size in the inclined flow path direction is shown. However, if the nozzle hole 14 is inclined with respect to the bottom surface of the swirling chamber 17, a portion in which the angle formed by the bottom surface of the swirling chamber 17 and the inner circumferential surface of the nozzle hole 14 is acute will be generated. In the portion where the angle is acute, the inner wall of the injection hole 14 is not covered with the fuel film 19a, and the fuel flow is separated, so that the fuel film 19a is not sufficiently formed along the inner peripheral surface of the injection hole 14, and the atomization characteristic of the fuel after injection may be deteriorated.
Fig. 8 is a main portion sectional view showing a fuel injection valve 1 according to embodiment 2 of the present invention, which is an enlarged sectional view of one nozzle hole 14. As shown in fig. 8, the opening size is adjusted at the inlet portion of the nozzle hole 14, and a larger opening size is adopted at the connecting portion of the bottom surface of the revolution chamber 17 and the nozzle hole 14, and the inlet portion of the nozzle hole 14 is set in a curved surface shape. That is, the diameter of the inlet portion of the nozzle hole 14 is enlarged, and a corner portion including a portion where the bottom surface of the rotation chamber 17 forms an acute angle with the inner circumferential surface of the nozzle hole 14 and a portion where the angle is an obtuse angle is removed and chamfered, thereby forming a smooth curved-surface-shaped inlet portion. This improves the fuel inflow state at the inlet portion of the injection hole 14, suppresses separation of the fuel film 19a, and enables more efficient atomization of the fuel.
Embodiment 3
Next, a fuel injection valve 1 according to embodiment 3 of the present invention will be described with reference to fig. 9 to 11.
In embodiment 1, an example is shown in which the planar shape of the branch flow path 18 provided in the orifice plate 13 is cross-shaped. However, the branched flow path 18 may have other shapes.
Fig. 9 is a plan view showing the branch flow path 18 of the orifice plate 13, and shows a state in which the branch flow path 18 is provided in an H-shape. In the case where the branch flow path 18 is H-shaped, the four rotation chambers 17 are provided at equal distances from the axis such that the center position of the inlet portion of the nozzle hole 14 is offset upstream of the branch flow path 18 from the center position of the rotation chamber 17, and the offset direction is parallel to the introduction direction of the fuel in the branch flow path 18. Accordingly, most of the fuel flowing into the swirl chamber 17 flows into the nozzle hole 14 after rotating once in the swirl chamber 17, and therefore, the fuel can obtain sufficient swirling force in the swirl chamber 17. Therefore, the atomization state of the injected fuel becomes good.
Fig. 10 is a plan view showing the I-shaped branch flow path 18 of the orifice plate 13, and illustrates a state in which two rotation chambers 17 having opposite rotation directions are disposed adjacent to each other at the end of the branch flow path 18. Even in the case of the above-described branched flow path 18 having an I-shape, the branched flow path 18 is provided such that the direction in which the fuel is introduced from the branched flow path 18 into the rotation chamber 17 and the direction in which the nozzle hole 14 is inclined substantially coincide with each other in a plane perpendicular to the axis, and the offset direction of the inlet portion of the nozzle hole 14 is parallel to the direction in which the fuel is introduced into the branched flow path 18 before reaching the rotation chamber 17. Thereby, the center position of the inlet portion of the injection hole 14 is offset toward the upstream side of the fuel passage of the branch passage 18. In this case, a sufficient swirling force can be obtained in the swirling chamber 17, and atomization of the injected fuel can be promoted. In this manner, one integrated branch flow passage 18 may be provided for the two turning chambers 17.
Fig. 11 is a plan view showing an X-shaped branch flow path 18 of the orifice plate 13, and four rotation chambers 17 having equal distances from the axis are provided at the end of the X-shaped branch flow path 18 so that the center position of the inlet portion of the orifice 14 is offset by maintaining an angle with respect to the center positions of the flow path of the branch flow path 18 and the rotation chambers 17. In this way, the branch flow path 18 is configured to pass through the center of the valve seat opening 12b of the fuel supply unit 1 a. In this case, in each of the swirl chambers 17, the center position of the inlet portion of the injection hole 14 is offset in the direction opposite to the fuel injection direction in the plane orthogonal to the axis, and therefore, the liquid film can be made uniform at the outlet portion of the injection hole 14, and atomization of the injected fuel becomes better.
As shown in fig. 11, the angle at which the two branch flow paths 18 intersect before reaching the two injection holes 14 injecting the fuel in the same direction is acute. Accordingly, it can be said that the direction in which the fuel flows from the branch flow passage 18 into the swirl chamber 17 and the direction in which the nozzle hole 14 is inclined substantially coincide with each other in a plane orthogonal to the axis.
In the present invention, the embodiments can be freely combined, or can be appropriately modified or omitted within the scope of the invention.
(symbol description)
1a fuel injection valve; 1a fuel supply section; 4a solenoid device; 5, a shell; 6 a core part; 7, coils; 8 an armature; 8a armature outer surface portion; 8b armature upper face; 9a valve means; 10 a valve core; 11 a valve body; 12 valve seats; 12b a valve seat opening part; 13, a spray orifice plate; 14, spraying holes; 14a center of the entrance; 14b center of exit; 14c bias direction; 15 spheres; 15a chamfer; 16 a compression spring; 17a rotary chamber; 17a centre of gyration; 18 branch flow paths; 18a lead-in direction; 19a fuel; 19a fuel film; 20 a fuel stream; 21 spraying fuel; 21a fuel injection direction; 22 an air inlet; and 23 an intake valve.
Claims (6)
1. A fuel injection valve characterized by comprising:
a fuel supply unit that supplies fuel in an axial direction of the flow path; and
an orifice plate provided downstream of the fuel supply unit, the orifice plate branching the fuel supplied from the fuel supply unit in a plurality of directions within a plane orthogonal to an axis that is a central axis of the fuel injection valve, guiding the fuel to a turning chamber that applies turning force to the fuel, and injecting the fuel from an orifice hole that is inclined with respect to the axis and that passes through a bottom surface of the turning chamber orthogonal to the axis,
in the injection hole, a center of an inlet portion into which the fuel flows is offset from a revolution center of the fuel of the revolution chamber in a plane orthogonal to the axis toward a direction opposite to an inclination direction of the injection hole, and a center of an outlet portion from which the fuel is ejected is provided so as to be located directly below the revolution center.
2. The fuel injection valve according to claim 1,
the fuel supplied to the orifice plate is guided to the rotation chamber via a branch flow path formed by a concave portion provided on an upper surface of the orifice plate,
the bottom surface of the branch flow path and the bottom surface of the rotation chamber are formed by a single continuous flat surface.
3. The fuel injection valve according to claim 1 or 2,
the turning chambers are arranged at four different positions equidistant from the shaft,
fuel is injected from adjacent two of the turnaround chambers in the same direction so as to diverge from the orifice plate into a fork shape.
4. The fuel injection valve according to claim 1 or 2,
the inlet of the injection hole is formed in a curved surface shape.
5. The fuel injection valve according to claim 2,
the planar shape of the branch flow path of the rotation chamber is any one of a cross shape, an I shape, an H shape, and an X shape.
6. The fuel injection valve according to claim 1 or 2,
the rotation chamber has a cylindrical shape, and the center of the cylindrical shape is the rotation center of the fuel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2017/016912 WO2018198309A1 (en) | 2017-04-28 | 2017-04-28 | Fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110537015A CN110537015A (en) | 2019-12-03 |
| CN110537015B true CN110537015B (en) | 2021-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780089641.0A Expired - Fee Related CN110537015B (en) | 2017-04-28 | 2017-04-28 | Fuel injection valve |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6745986B2 (en) |
| CN (1) | CN110537015B (en) |
| WO (1) | WO2018198309A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020157823A (en) * | 2019-03-25 | 2020-10-01 | 本田技研工業株式会社 | Oil supply guide |
| JP7257525B2 (en) * | 2019-08-09 | 2023-04-13 | 日立Astemo株式会社 | fuel injector |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3808396C2 (en) * | 1988-03-12 | 1995-05-04 | Bosch Gmbh Robert | Fuel injector |
| JP2005337191A (en) * | 2004-05-31 | 2005-12-08 | Mitsubishi Electric Corp | Fuel injection valve |
| JP2012211532A (en) * | 2011-03-31 | 2012-11-01 | Hitachi Automotive Systems Ltd | Fuel injection valve |
| JP5961383B2 (en) * | 2012-01-11 | 2016-08-02 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
| JP2013185522A (en) * | 2012-03-09 | 2013-09-19 | Hitachi Automotive Systems Ltd | Fuel injection valve |
| JP2013194725A (en) * | 2012-03-23 | 2013-09-30 | Hitachi Automotive Systems Ltd | Fuel injection valve |
| JP5976065B2 (en) * | 2014-09-26 | 2016-08-23 | 三菱電機株式会社 | Fuel injection valve |
| JP2016098702A (en) * | 2014-11-20 | 2016-05-30 | 株式会社日本自動車部品総合研究所 | Fuel injection valve |
| JP6523984B2 (en) * | 2016-02-12 | 2019-06-05 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
-
2017
- 2017-04-28 JP JP2019515017A patent/JP6745986B2/en not_active Expired - Fee Related
- 2017-04-28 WO PCT/JP2017/016912 patent/WO2018198309A1/en active Application Filing
- 2017-04-28 CN CN201780089641.0A patent/CN110537015B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018198309A1 (en) | 2018-11-01 |
| JP6745986B2 (en) | 2020-08-26 |
| CN110537015A (en) | 2019-12-03 |
| JPWO2018198309A1 (en) | 2019-07-04 |
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