JP4053048B2 - Fuel injection valve - Google Patents

Description

The present invention relates to a fuel injection valve used in a fuel supply system of an internal combustion engine , and in particular, a valve seat member having a conical valve seat and a valve hole penetrating through the central portion of the valve seat, and cooperating with the valve seat. A valve body that opens and closes the valve hole, and an injector plate that has a plurality of fuel injection holes that are arranged radially offset from the valve hole and is joined to the valve seat member. The present invention relates to an improvement in a fuel injection valve in which a diffusion chamber communicating between the valve hole and the fuel injection hole is provided between a seat member and an injector plate.

Such a fuel injection valve is already known as disclosed in Patent Document 1 below.
JP 2002-130074 A

  In recent internal combustion engines, demands for low fuel consumption and low pollution are increasing. Therefore, in order to reduce the fuel consumption of the engine and purify the exhaust gas, in the fuel injection valve, the atomization of the injected fuel and the penetrability (penetrating power) for suppressing the adhesion of the fuel to the inner wall of the intake passage are important.

  The present invention has been made in view of such circumstances, and reduces the dead volume of the fuel flow path from the valve seat to the fuel injection hole as much as possible, and suppresses the pressure loss of the fuel in the fuel flow path as much as possible. Thus, an object of the present invention is to provide the fuel injection valve that can bring about the atomization of the injected fuel and improve the penetration.

To achieve the above object, the present invention is opened and closed with a valve seat member having a valve hole penetrating a central portion of the conical valve seat and the valve seat, the valve hole in cooperation with the valve seat A pair of fuel spray holes are formed in two sets, each of which forms a valve body and a pair of fuel spray foams, and supplies the fuel spray foams toward the downstream end of the fork of the intake port of the engine. There are, it comprises an injector plate which is joined to the valve seat member, said two sets of fuel injection holes are symmetrically arranged with respect to one diametrical line of the injector plate, between the valve seat member and the injector plate in the fuel injection valve provided with a diffusion chamber which communicates between the valve hole and the fuel injection hole, between the valve seat member and the injector plate, with larger diameter than the valve hole, among all of the fuel injection hole single, ring end is opened Wherein forming a diffusion chamber, the central portion of the injector plate, while being fitted into the valve hole, induces fuel passing through the valve seat into the diffusion chamber is inverted with the valve bore, notch A fuel guide member having a pair of first cutout portions having a large area and a pair of second cutout portions having a cutout area smaller than that of the first cutout portion is provided continuously, and the first cutout portion is provided. The first feature is that the portions are arranged symmetrically with respect to the diameter line of the injector plate so as to match the pair of fuel spray foams .

In addition to the first feature, the second feature of the present invention is that the second notch is located on the diameter line and opens in opposite directions .

Furthermore, in addition to the first or second feature, the present invention is configured such that the valve hole is fitted between the first notch part and the second notch part to the inner peripheral surface of the valve hole. A third feature is that a closed portion is formed so that fuel is not allowed to flow through the portion .

Furthermore, in addition to the first to third features, the present invention provides the valve seat and the notch so that an extension of the bus bar of the conical valve seat intersects the inner surface of the notch. The arrangement is a fourth feature.

  In addition to the first to fourth features, the present invention is such that 1 <D1 / D2 ≦ 1.5, where D1 is the effective diameter of the valve seat and D2 is the diameter of the valve hole. The fifth feature is that D1 and D2 are set.

Furthermore, in addition to the first to fifth features, the present invention is such that H2 / H1 ≧ 1.5 when the height of the diffusion chamber is H1 and the thickness of the fuel guiding member is H2. The sixth feature is that the H1 and H2 are set.

The present invention, in addition to the first to the sixth aspect, the that the end face of the fuel guide member facing the valve hole was formed along the end face of the valve body facing the valve hole 7 It is characterized by.

Furthermore, in addition to the first to seventh features, the present invention is characterized in that the fuel guide member is made of a press and is joined to the injector plate by spot welding with a laser from the outer surface side of the injector plate. The eighth feature.

According to the first to third aspect of the present invention, a fuel passage path to the fuel injection hole from the valve seat, short and can be made small dead volume, thereby the pressure loss of the fuel effectively The fuel that has passed through the valve seat can be quickly injected from each fuel injection hole, resulting in atomization of the injected fuel and improved penetration, resulting in lower fuel consumption of the engine and lower pollution of the exhaust gas. Can contribute greatly. Also it is assumed the fuel passage path small dead volume is also effective to stabilize the fuel injection characteristics to changes in temperature. Further, since the fuel passage is formed by the notch provided on the outer periphery of the fuel guide member, the fuel passage can be formed easily and is easy to manufacture. In addition, the flow of fuel in the diffusion chamber can be controlled by the arrangement of the plurality of notches in the valve hole, and the direction of the injected fuel from each fuel nozzle can be freely controlled.

According to the fourth aspect of the present invention, the valve seat and the notch are arranged in a simple structure so that the extension of the bus bar of the conical valve seat intersects the inner surface of the notch. The fuel that has passed through the seat is directly collided with the inner surface of the notch of the fuel guide member, and the fuel flow is quickly and forcibly reversed to the diffusion chamber side, and the rapid fuel from the fuel injection hole is suppressed while suppressing pressure loss. This enables injection, which can contribute to atomization of injected fuel and improved penetration.

Further , according to the fifth feature of the present invention, by setting 1 <D1 / D2 ≦ 1.5, the distance between the valve seat and the fuel injection hole is shortened as much as possible, and the pressure loss of the fuel between them is effective. This can contribute to the improvement of atomization and penetration of the injected fuel.

Further, according to the sixth aspect of the present invention, by setting H2 / H1 ≧ 1.5, the main flow of the fuel that has passed through the valve seat is more reliably collided with the inner surface of the notch portion of the fuel guide member. things can, and allow quick not forcibly inverted into the diffusion chamber side of the flow of the fuel, is quickly fuel injected from the fuel injection hole, can contribute to the improvement of the atomization and penetration of the injected fuel.

Furthermore, according to the seventh feature of the present invention, since the end face of the fuel guide member facing the valve hole is formed along the end face of the valve body facing the valve hole, the dead end of the valve hole is formed by the fuel guide member. It is possible to effectively reduce the volume, to reduce the pressure loss of the passing fuel, and to further stabilize the fuel injection characteristics against temperature changes.

Furthermore, according to the eighth aspect of the present invention, the fuel guide member can be easily manufactured and can be easily welded to the injector plate while avoiding thermal deformation of the fuel guide member. The fuel inductivity of the member can be stabilized and the cost can be reduced.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a plan view showing a use state of an electromagnetic fuel injection valve according to a first embodiment of the present invention in an engine, FIG. 2 is a longitudinal sectional view of the fuel injection valve, and FIG. 3 is an enlarged view of a part 3 in FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a perspective view showing a joining state of the fuel guiding member to the injector plate in the fuel injection valve, and FIG. 6 is a fuel spray form by the injected fuel of the fuel injection valve. FIG. 7 shows a second embodiment of the present invention, a corresponding diagram with FIG. 4, FIG. 8 shows a reference example of the present invention, a corresponding diagram with FIG. 4, and FIG. 3 shows an embodiment, corresponding view of FIG. 3, FIG. 10 shows a fourth embodiment of the present invention, the corresponding view of the FIG. 3, FIG. 11 shows a fifth embodiment of the present invention, with FIG. 3 FIG.

  First, a description will be given of the first embodiment of the present invention shown in FIGS.

  In FIG. 1, a combustion chamber 53 and an intake port 50 a that opens a downstream end of the combustion chamber 53 are formed in the cylinder head 50 of the engine E. The intake port 50a is bifurcated on the downstream side and opens into the combustion chamber 53. The pair of openings is opened and closed by a pair of intake valves 52a and 52b. One side surface of the cylinder head 50 is joined to an intake manifold 51 that is connected to the upstream end of the intake port 50a. The intake manifold 51 has a bifurcated intake port 50a when the intake valves 52a and 52b are opened. The electromagnetic fuel injection valve I of the present invention for supplying a pair of fuel spray foams F1, F2 toward the downstream end is attached.

  2 and 3, the valve housing 2 of the fuel injection valve I includes a cylindrical valve seat member 3 having a valve seat 8 at the front end, and a coaxially liquid-tight manner at the rear end portion of the valve seat member 3. A magnetic cylinder 4 to be coupled, a nonmagnetic cylinder 6 coaxially and liquid-tightly coupled to the rear end of the magnetic cylinder 4, and a liquid crystal coaxially and liquid-tightly to the rear end of the nonmagnetic cylinder 6. The fixed core 5 is coupled to the rear end of the fixed core 5 and a fuel inlet cylinder 26 is provided coaxially.

  The valve seat member 3 includes a cylindrical guide hole 9, a conical valve seat 8 connected to the front end of the guide hole 9, and a valve hole 7 penetrating through the central portion of the valve seat 8.

  A hollow cylindrical fixed core 5 is press-fitted into the inner peripheral surface of the nonmagnetic cylindrical body 6 from the rear end side thereof, whereby the nonmagnetic cylindrical body 6 and the fixed core 5 are coaxially coupled to each other. At this time, a portion that does not fit with the fixed core 5 remains at the front end portion of the nonmagnetic cylindrical body 6, and the valve assembly V is accommodated in the valve housing 2 extending from the portion to the valve seat member 3.

The valve assembly V is connected to the valve rod portion 17 including a valve portion 16 that opens and closes with respect to the valve seat 8 and a valve rod portion 17 that supports the valve portion 16, and is connected to the valve rod portion 17. It consists of a movable core 12 that straddles the cylindrical body 6 and is inserted into them and placed on the fixed core 5 on the same axis. The valve rod portion 17 is formed to have a smaller diameter than the guide hole 9, and the journal portion 17 a that protrudes radially outward at the outer periphery thereof and is slidably supported on the inner peripheral surface of the guide hole 9. Are integrally formed. In addition, a journal portion 17 b is formed on the outer periphery of the movable core 12 so as to be slidably supported on the inner peripheral surface of the magnetic cylindrical body 4.

  The valve assembly V includes a vertical hole 19 that ends from the rear end surface of the movable core 12 before the valve portion 16, and a plurality of first horizontal holes 20 a that communicate with the outer peripheral surface of the movable core 12. A plurality of second lateral holes 20b are provided to communicate the vertical hole 19 with the outer peripheral surface of the valve rod part 17 between the journal part 17a and the valve part 16. At that time, an annular spring seat 24 facing the fixed core 5 is formed in the middle of the vertical hole 19.

The fixed core 5 is made of a ferrite-based high hardness magnetic material. On the other hand, in the movable core 12, a collar-like high-hardness stopper element 14 that embeds a later-described valve spring 22 is embedded in a suction surface opposite to the suction surface of the fixed core 5. The stopper element 14 has its outer end slightly protruded from the suction surface of the movable core 12 and is normally opposed to the suction surface of the fixed core 5 with a gap corresponding to the valve opening stroke of the valve body 18. The

  The fixed core 5 has a vertical hole 21 that communicates with the vertical hole 19 of the valve assembly V, and a fuel inlet cylinder 26 that communicates internally with the vertical hole 21 is integrally connected to the rear end of the fixed core 5. . The fuel inlet cylinder 26 includes a reduced diameter portion 26a connected to the rear end of the fixed core 5 and a subsequent enlarged diameter portion 26b, and is a pipe with a slot that is press-fitted into the vertical hole 21 from the reduced diameter portion 26a. A valve spring 22 for biasing the movable core 12 toward the valve closing side of the valve body 18 is provided between the retainer 23 and the spring seat 24. At that time, the set load of the valve spring 22 is adjusted by the depth of fitting of the retainer 23 into the vertical hole 21. A fuel filter 27 is mounted in the enlarged diameter portion 26b.

A coil assembly 28 is fitted to the outer periphery of the valve housing 2 so as to correspond to the fixed core 5 and the movable core 12. The coil assembly 28 includes a bobbin 29 fitted to the outer peripheral surface from the rear end portion of the magnetic cylindrical body 4 to the fixed core 5 and a coil 30 wound around the bobbin 29. The front end of the coil housing 31 that surrounds 28 is welded to the outer peripheral surface of the magnetic cylindrical body 4, and the rear end is welded to the outer peripheral surface of the yoke 5 a that protrudes in a flange shape from the outer periphery of the rear end portion of the fixed core 5. The coil housing 31 has a cylindrical shape, and a slit 31a extending in the axial direction is formed on one side.

  A part of the magnetic cylinder 4, the coil housing 31, the coil assembly 28, the fixed core 5, and the front half of the fuel inlet cylinder 26 are embedded in a synthetic resin cylindrical mold part 32 by injection molding. At that time, the mold portion 32 is filled into the coil housing 31 through the slit 31a. A coupler 34 protruding in one side is integrally formed in the middle portion of the mold portion 32, and the coupler 34 holds a current-carrying terminal 33 connected to the coil 30.

A disc-like injector plate 10 is liquid-tightly laser welded to the front end surface of the valve seat member 3, and the diameter of the injector plate 10 and the valve seat member 3 is larger than that of the valve hole 7. A single annular diffusion chamber 39 is formed. The outer peripheral wall of the annular diffusion chamber 39 is constituted by the valve seat member 3, and the inner peripheral wall thereof is constituted by a fuel guiding member 40 that is joined to the inner surface of the injector plate 10 and fitted into the valve hole 7.

The injector plate 10 is provided with a plurality of fuel injection holes 11, 11... Whose inner ends open into the diffusion chamber 39. These fuel injection holes 11, 11... Are formed so as to be parallel to the axis Y of the valve seat member 3, as clearly shown in FIGS. 3 and 4, and on a virtual circle C 1 centering on the axis Y. Arranged. In this case, these fuel injection holes 11, 11... Are divided into two sets G 1, G 2 that are arranged symmetrically with respect to the virtual circle C 1 , and hence the one diameter line R of the injector plate 10 . In each set G1, G2, in the central portion more fuel injection holes 11 (in the illustrated example three) (A) are arranged have location equidistant, on both outer sides of the fuel injection holes 11 (A), A pair of fuel injection holes 11 (B) are arranged at a distance greater than the above interval.

As shown in FIGS. 3 to 5, the fuel guide member 40 has a basic disk shape, and is fitted to the inner peripheral surface of the valve hole 7 to partially close the valve hole 7, and pass through that part. Has a plurality of closed portions 41, 41... For preventing the fuel from flowing and a plurality of notches 42a, 42b between the closed portions 41, 41... And communicating between the valve hole 7 and the diffusion chamber 39 on the outer periphery. I have.

  If the positions of the notches 42a and 42b are determined, the positions of the closing portions 41, 41... Between them are naturally determined, so the arrangement of the notches 42a and 42b will be described.

Wherein in response to each set G1, G2 three fuel injection holes 11 (A) are aligned region of the central portion of the first notch 42a cutout area S1 is one of the large Ru is located. That is, the first notch portion 42a is disposed symmetrically with respect to the diameter line R of the injector plate 10 so as to match the pair of fuel injection foams F1, F2. A pair of second notches 42b having a small notch area S2 opening in opposite directions along the diameter line R is disposed. The fuel injection holes 11 (B) on the outer side of each set G1, G2 are arranged so as to face the closing part 41 adjacent to each second notch part 42b.

  Each notch 42a, 42b is arranged so as to circumscribe a virtual circle C2 centered on the axis of the valve seat member 3, and an extension line L of the bus bar of the conical valve seat 8 is connected to each notch 42a, It intersects with the inner surface of 42b.

  Further, the notch width W1 along the inner peripheral surface of the valve hole 7 of the first notch portion 42a is set wider than the notch width W2 along the inner peripheral surface of the valve hole 7 of the second notch portion 42b. The opening area S1 of the notch 42a is set larger than the opening area S2 of the second notch 42b.

Fuel guide member 40, in order to minimize the dead volume in the valve hole 7, as much as possible deeply fitted into the valve hole 7 so as not to interfere with the front end surface of the valve body 18, also the valve body 18 and the fuel guide member The 40 opposing surfaces 16a and 40a are formed in flat surfaces parallel to each other.

  The fuel guide member 40 is manufactured by pressing a thin steel plate, and is joined to the injector plate 10 by laser spot welding from the outer surface side.

Here, when the notch width along the inner peripheral surface of the valve hole 7 of the first notch portion 42a is W1, and the notch width along the inner peripheral surface of the valve hole 7 of the second notch portion 42b is W2, Is set so that:

W1: W2≈3: 2 (1)
The opening area of the first notch 42a is S1, the opening area of the second notch 42b is S2, the opening area between the valve seat 8 and the valve body 18 is S3, and all the first and second sets of fuel injections. When the total opening area of the holes 11, 11... Is S4, the effective diameter of the valve seat 8 is D1, and the valve opening stroke of the valve body 18 is t, these are set so that the following equation is established.

(S1 + S2)>S3> S4 (2)
S3 = D1 × t (3)
Further, when the effective diameter of the valve seat 8 is D1 and the diameter of the valve hole 7 is D2, these are set so that the following equation is established.

1 <D1 / D2 ≦ 1.5 (4)
Further, when the height of the diffusion chamber 39 is H1 and the thickness of the fuel guiding member 40 is H2, these are set so that the following equation is established.

H2 / H1 ≧ 1.5 (5)
Next, the operation of the first embodiment will be described.

  When the coil 30 is demagnetized, the valve assembly V is pressed forward by the biasing force of the valve spring 22, and the valve body 18 is seated on the valve seat 8. In this state, the fuel pumped from the fuel pump (not shown) to the fuel inlet cylinder 26 passes through the pipe-like retainer 23, the vertical hole 19 of the valve assembly V, and the first and second horizontal holes 20a and 20b. 3 is put on standby and used for lubrication around the journal portions 17a and 17b of the valve assembly V.

  When the coil 30 is energized by energization, the magnetic flux generated by the coil 30 sequentially travels through the fixed core 5, the coil housing 31, the magnetic cylindrical body 4, and the movable core 12, and the movable core 12 of the valve assembly V is set to the valve spring 22 by the magnetic force. Since the valve portion 16 of the valve body 18 is separated from the valve seat 8 of the valve seat member 3 as shown in FIG. 3, the mainstream of the high-pressure fuel in the valve seat member 3 is sucked by the fixed core 5 against the load. S advances to the valve hole 7 side along the conical surface of the valve seat 8.

  By the way, a fuel guide member 40 that defines a diffusion chamber 39 having a larger diameter is fitted into the valve hole 7. The fuel guide member 40 is provided in the fuel guide member 40 and communicates between the valve hole 7 and the diffusion chamber 39. Since the extension line L of the bus bar of the conical valve seat 8 intersects the inner surfaces of the plurality of notches 42a and 42b, the fuel flowing toward the valve hole 7 along the valve seat 8 The main stream S directly collides with the inner surfaces of the notches 42a and 42b of the fuel guiding member 40, and is quickly and forcibly reversed toward the diffusion chamber 39, and is quickly injected from the fuel injection holes 11, 11. .

Fuel guide member 40, as described above, including the valve hole 7 and the diffusion chamber 39, a fuel passage path from the valve seat 8 to each fuel injection hole 11, short and be involved in a small dead volume, Thereby, the pressure loss of the fuel is effectively suppressed, and the fuel that has passed through the valve seat 8 can be quickly injected from the fuel injection holes 11, 11. Therefore, the fuel injected from the fuel injection holes 11, 11... Can be effectively atomized and good fuel spray foams F1, F2 having high penetration can be formed.

Also it is assumed fuel passage path to the respective fuel injection holes 11 from the valve seat 8 as above small dead volume also contributes to the stabilization of the fuel injection characteristics to changes in temperature.

  By the way, the notches 42a and 42b are arranged so as to circumscribe the virtual circle C2 centered on the axis of the valve seat member 3, and therefore, the conditions for collision of fuel with the inner surfaces of the notches 42a and 42b are determined. Can be constant.

Thus, as shown in FIG. 6, the fuel that has collided with the inner surface of the first notch 42a is reflected to the diffusion chamber 39 side, and the fuel injection hole 11 (in the central portion of each set G1, G2 in the injector plate 10) Injected from A), the respective ejection directions are slightly inclined in the radial direction due to the influence of fuel reflection at the first notch 42a. On the other hand, the fuel that has collided with the inner surface of the second notch 42b is reflected to the diffusion chamber 39 side, and then is split into two by the inner peripheral surface of the diffusion chamber 39, and the fuel injection holes 11 at the outer portions of the respective groups G1 and G2 injected from (B), the direction out its injection is due to the influence of induction by the inner peripheral surface of the diffusion chamber 39, two sets G1, the fuel injection holes of the G2 11, 11 ...; the diameter line passing through the 11, 11 ... between It tilts in a direction substantially orthogonal to R. As a result, the fuel injected from the fuel injection holes 11, 11,... Of each set G1, G2 forms a pair of substantially conical fuel spray foams F1, F2, and these fuel spray foams F1, F2 are connected to the intake port 50a. Supplied toward the downstream end of the fork. Since these spray foams F1 and F2 have high penetrability, there is very little loss of fuel adhering to the inner wall of the intake port 50a of the engine E, which can greatly contribute to fuel efficiency reduction of the engine E and low pollution of exhaust gas.

  In particular, as described above, by setting (S1 + S2)> S3> S4, the diffusion chamber 39 between the valve seat 8 and the valve body 18 and each fuel injection hole 11 does not become a throttle. Therefore, the pressure loss of fuel in the diffusion chamber 39 can be effectively suppressed. Moreover, in each fuel injection hole 11, the flow velocity of the injected fuel can be effectively increased by the orifice effect, and atomization of the injected fuel can be effectively promoted.

Further, by setting W1: W2≈3: 2, the fuel flow rate in the first notch portion 42a and the second notch portion 42b is changed to the fuel injection hole 11 (A) and the outer portion at the center of each set G1, G2. The number of the fuel injection holes 11 (B) can correspond to the number of the fuel injection holes 11 (B), so that the fuel injected from the fuel injection holes 11 (A) and 11 (B) of each set G1 and G2 is equalized. The fuel spray foams F1 and F2 can be formed.

  Further, as described above, by setting 1 <D1 / D2 ≦ 1.5, the distance between the valve seat 8 and the fuel injection hole 11 is shortened as much as possible, and the pressure loss of the fuel between them is effectively suppressed. , It can contribute to atomization of injected fuel and improvement of penetration.

Further, by setting H2 / H1 ≧ 1.5 as described above, the main flow S of the fuel that has passed through the valve seat 8 can be more reliably collided with the inner surfaces of the notches 42a and 42b of the fuel guide member 40. can be, to allow quick not forcibly inverted into the diffusion chamber 39 side of the flow of the fuel, the fuel injection holes 11 is quickly fuel injection from, it can contribute to the improvement of the atomization and penetration of injected fuel .

Further, since the end surface 40a of the fuel guide member 40 fitted into the valve hole 7 and the front end surface 16a of the valve body 18 facing the valve hole 7 are flat surfaces parallel to each other, the dead volume of the valve hole 7 is set by the fuel guide member 40. Can be effectively reduced, the pressure loss of the fuel passing therethrough can be reduced, and the fuel injection characteristics against temperature change can be further stabilized.

  Further, since the fuel guide member 40 is made of a press and joined to the injector plate 10 by laser spot welding from the outer surface side, the fuel guide member 40 can be easily manufactured and the fuel guide member 40 is thermally deformed. This can be easily welded to the injector plate 10 to stabilize the fuel inductivity of the fuel guide member 40 and to reduce the cost.

  Next, a second embodiment of the present invention shown in FIG. 7 will be described.

  In the second embodiment, the number of fuel injection holes 11 (A) in the central portion of the fuel injection holes 11, 11,... Of each set G1, G2 of the injector plate 10 is larger than that in the first embodiment. The arrangement is substantially the same as that of the first embodiment except that the width of the cutout of the first cutout portion 42a of the fuel guiding member 40 is wider than that of the first embodiment. Therefore, in FIG. 7, parts corresponding to those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  According to the second embodiment, the number of the fuel injection holes 11 (A) at the center of each of the fuel injection holes 11, 11. Since the cutout width of the cutout portion 42a is increased, the total fuel injection amount of all the fuel injection holes 11 (A) in the central portion can be increased. Therefore, contrary to the above, in the fuel injection holes 11, 11... Of each set G 1, G 2, the number of the central fuel injection holes 11 (A) is reduced and the first cutting of the fuel guiding member 40 is performed. If the notch width of the notch portion 42a is narrowed, the total fuel injection amount of all the fuel injection holes 11 (A) in the center portion can be reduced. At this time, if the diameter of each fuel injection hole 11 is set small, atomization of the injected fuel can be promoted, and if the diameter is set large, the fuel injection amount can be increased.

Next, a reference example of the present invention shown in FIG. 8 will be described.

In this reference example , in each set of fuel injection holes 11, 11... Of the injector plate 10, a plurality of independent notches 42 a ′ are provided to the fuel corresponding to the plurality of fuel injection holes 11 (A) at the center. Except for the point provided in the guide member 40 and the cutout portion 42b 'for supplying fuel from the circumferential direction to the fuel injection hole 11 (B) on the outer side independently for each of the groups G1 and G2, the first Since the configuration is the same as that of the embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIG.

Next, a third embodiment of the present invention shown in FIG. 9 will be described.

The third embodiment is the same as the first embodiment except that the end surface 40a of the fuel guide member 40 fitted into the valve hole 7 and the front end surface 16a of the valve body 18 facing the valve hole 7 are formed in a substantially concentric spherical surface. Since the configuration is the same as that of the embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIG.

In the fourth embodiment of the present invention shown in FIG. 10, the end surface 40a of the fuel guide member 40 fitted into the valve hole 7 and the front end surface 16a of the valve body 18 facing the valve hole 7 are directed toward the injector plate 10 side. A conical surface having a small diameter and a substantially same conical angle is formed, and the other configuration is the same as that of the first embodiment. Therefore, in FIG. 10, parts corresponding to those of the first embodiment have the same reference numerals. A duplicate description is omitted.

In the fifth embodiment of the present invention shown in FIG. 11, the end surface 40a of the fuel guiding member 40 fitted in the valve hole 7, the front end surface 16a of the valve body 18 facing the valve hole 7, and the small diameter side in the fourth embodiment. Is formed in a conical surface facing in the opposite direction.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the fuel injection holes 11 of the groups G1 and G2 are arranged in the direction perpendicular to the diameter line R in response to the inclination request of the fuel spray foams F1 and F2 to be formed with respect to the axis Y of the valve seat member 3. It may be inclined with respect to the axis Y in the range of 5 to 15 °.

The top view which shows the use condition in the engine of the electromagnetic fuel injection valve which concerns on 1st Example of this invention. The longitudinal cross-sectional view of the fuel injection valve. FIG. 3 is an enlarged view of part 3 of FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. The perspective view which shows the joining state of the fuel induction member to the injector plate in the fuel injection valve. Explanatory drawing of formation of the fuel spray foam with the fuel injected from the fuel injection valve. FIG. 5 is a view corresponding to FIG. 4 showing a second embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 4 showing a reference example of the present invention. FIG. 4 is a view corresponding to FIG. 3 showing a third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 3 showing a fourth embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 3 showing a fifth embodiment of the present invention.

Explanation of symbols

E ... Engine
F1, F2 ... Fuel spray foam
G1, G2 ... set I ... fuel injection valve L ... extension of valve seat bus
R ... Diameter line 3 ... Valve seat member 7 ... Valve hole 8 ... Valve seat 10 ... Injector plate 11 ... Fuel injection hole 16a ... closure 42a · of · valve body end face 18 ... valve body 39 ... diffusion chamber 40 .... fuel guide member 40a · · · fuel guide member end surface 41 ... fuel guide member ..First notch 42 b ... Second notch
50a ... intake port

Claims (8)

Conical valve seat (8) and the center a valve seat member (3) having a valve hole (7) passing through the said valve hole in cooperation with the valve seat (8) of the valve seat (8) A valve body (18) for opening and closing (7) and a pair of fuel spray foams (F1, F2) are formed, and the fuel spray foams (F1, F2) are connected to the fork of the intake port (50a) of the engine (E). supplied towards the downstream end, have each set plurality of fuel injection holes formed in the two pairs (G1, G2) (11), the injector plate (10 which is joined to the valve seat member (3) ) it becomes and a, the two sets of fuel injection holes (11) are symmetrically arranged with respect to one diametrical line (R) of the injector plate (10), the valve seat member (3) and the injector plate ( 10) the valve hole (7) and the fuel injection hole (11) while diffusion chamber which communicates between In the fuel injection valve having a 39),
During the valve seat member (3) and the injector plate (10), with a larger diameter than the valve hole (7), the diffusion of all single, annular inner end opening of said fuel injection holes (11) Forming a chamber (39),
In the central portion of the injector plate (10), the fuel inserted into the valve hole (7 ) and passed through the valve seat (8) is reversed in the valve hole (7) to cause the diffusion chamber (39 The pair of first notches (42a) having a large notch area and a pair of second notches (42b) having a smaller notch area than the first notches (42a) are provided on the outer periphery. The provided fuel guide member (40) is connected,
The first notch (42a) is arranged symmetrically with respect to the diameter line (R) of the injector plate (10) so as to match the pair of fuel spray foams (F1, F2). Fuel injection valve. The fuel injection valve according to claim 1, wherein
The fuel injection valve, wherein the second notch (42b) is located on the diameter line (R) and opens in opposite directions . The fuel injection valve according to claim 1 or 2 ,
Between the first notch portion (42a) and the second notch portion (42b), the valve hole (7) is partially fitted into the inner peripheral surface of the valve hole (7). A fuel injection valve characterized in that a closed portion (41) is formed to close and prevent fuel from flowing through the portion . The fuel injection valve according to any one of claims 1 to 3 ,
The valve seat (8) and the notches (42a, 42b) so that the extension (L) of the bus bar of the conical valve seat (8) intersects the inner surface of the notches (42a, 42b). ) Is disposed, a fuel injection valve. The fuel injection valve according to any one of claims 1 to 4,
When the effective diameter of the valve seat (8) is D1, and the diameter of the valve hole (7) is D2,
1 <D1 / D2 ≦ 1.5
The fuel injection valve is characterized in that D1 and D2 are set so that The fuel injection valve according to any one of claims 1 to 5,
When the height of the diffusion chamber (39) is H1, and the thickness of the fuel guide member (40) is H2,
H2 / H1 ≧ 1.5
The fuel injection valve is characterized in that H1 and H2 are set so that In the fuel injection valve in any one of Claims 1-6 ,
An end face (40a) of the fuel guide member (40) facing the valve hole (7) is formed along the end face (16a) of the valve body (18) facing the valve hole (7). Fuel injection valve. The fuel injection valve according to any one of claims 1 to 7,
The fuel injection valve characterized in that the fuel guide member (40) is made of a press and is joined to the injector plate (10) by spot welding with a laser from the outer surface side of the injector plate.

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