JP2018091298A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change a fuel injection angle with a simple constitution in a fuel injection valve.SOLUTION: An injector plate 54 having plural injection holes 56 is housed in a recess part 52 of a valve seat member 16 constituting a fuel injection valve 10, and a cap member 58 is provided nearer a tip than the injector plate 54 to cover the injector plate 54. A circular hole part 64 penetrating in a thickness direction is formed at a center part of the cap member 58, and a diameter of the hole part 64 is set on an outer side than the opposed injection holes 56 of the injector plate 54. Thereby, the fuel injected from the injection holes 56 is injected while inclined outward in the radial direction to be drawn to an inner periphery of the hole part 64, so as to widen an injection angle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel injection valve that has a valve body that moves under an energization action of a coil and injects fuel into an internal combustion engine by opening the valve body.

  2. Description of the Related Art Conventionally, a fuel injection valve that opens a valve under the excitation action of a solenoid and injects supplied fuel into an internal combustion engine is known.

  In recent years, the fuel injection angle from such a fuel injection valve to the internal combustion engine has been widened, and more efficiently mixed with air, thereby improving fuel efficiency and fuel efficiency, and linearly. There is a demand to prevent the fuel from adhering to the intake port, which is a concern when it is injected into the intake port.

  For example, in the fuel injection valve disclosed in Patent Document 1, for example, a valve body is provided movably inside a cylindrical valve body, and an actuator for moving the valve body is provided. In addition, a guide member having an inclined surface that is inclined with respect to the outlet of the nozzle hole is fixed at the tip of the valve body while an injection hole for injecting fuel is opened. When the fuel is injected from the nozzle hole, the fuel is attracted to the inclined surface of the guide portion by the Coanda effect, and flows along the inclined surface, thereby widening the injection angle.

  On the other hand, the fuel injection valve disclosed in Patent Document 2 includes an injection hole plate having an injection hole at the tip of the valve body, and a second injection hole plate stacked on the injection hole plate. The second nozzle hole plate has a through hole that faces the nozzle hole of the nozzle hole plate and is slightly larger than the outlet shape of the nozzle hole. And when fuel is injected from an injection hole, it is injected, the breadth is suppressed by the internal peripheral surface of a through-hole.

JP 2004-324558 A JP 2002-221128 A

  However, since the fuel injection valve according to Patent Document 1 is configured such that the guide surface is provided only in a part around the nozzle hole, only a part of the fuel injected from the nozzle hole can be widened. It does not widen the entire spray. Further, since it is necessary to fix the minute guide member so that the inclined surface faces the nozzle hole at the tip of the valve body, the mounting accuracy required for the guide member is high, and accordingly, the manufacturing cost and the number of manufacturing steps are reduced. There is a problem that it increases.

  On the other hand, in the fuel injection valve according to Patent Document 2, the second injection hole plate provided in the injection hole plate is configured to prevent the fuel injection angle from widening, and the penetration force through which the fuel is injected linearly is provided. It is high and it is difficult to avoid adhesion to the intake port. Further, since the through hole of the second nozzle hole plate is formed so as to correspond to each nozzle hole in the nozzle hole plate, when the design change or the like occurs on the nozzle hole plate side, It is necessary to change the nozzle hole plate.

  The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a fuel injection valve capable of easily changing the fuel injection angle with a simple configuration and enhancing versatility. And

In order to achieve the above object, the present invention provides a valve seat member having a valve seat and a valve hole penetrating through the center of the valve seat, and a valve that opens and closes the valve hole by being seated and separated from the valve seat. In a fuel injection valve having a body and a plate member having a plurality of injection holes that are attached to an end of the valve seat member and inject fuel,
The valve seat member is provided with a second plate member that covers the plate member, and the second plate member is formed with a hole portion that surrounds the outer peripheral side of the plurality of injection holes, and the hole portion is on the inner peripheral side thereof. It has a diameter that can accommodate all of the plurality of nozzle holes.

  According to the present invention, the valve seat member constituting the fuel injection valve is provided with the second plate member so as to cover the plate member having the injection hole for injecting fuel, and the hole portion of the second plate member. However, it is provided so that the outer peripheral side of the several nozzle hole in a plate member may be enclosed.

  Therefore, when fuel is injected from a plurality of injection holes, the fuel is attracted to the hole side provided on the outer peripheral side of the injection holes by the Coanda effect, and the fuel is injected so as to diffuse radially outward. it can. As a result, the injection angle of the fuel injected from the nozzle hole can be reduced with a simple configuration in which the second plate member having the hole is provided on the tip of the fuel injection valve so as to cover the plate member having the nozzle hole. This makes it possible to change and inject the fuel, so that the fuel can be efficiently mixed with the air, and adhesion to the intake port can be effectively prevented. Further, even when the shape and position of the nozzle hole in the plate member are changed, the second plate member is bothered if the nozzle hole of the plate member is within the inner peripheral side of the hole of the second plate member. Since there is no need to change, it is highly versatile and suitable.

  Furthermore, by applying a turning force that turns along the circumferential direction of the plate member to the fuel that is injected from the nozzle hole, the fuel injection angle with a turning force that is small in straightness and low in penetration force is further effective. Therefore, it becomes possible to widen the angle.

  According to the present invention, the following effects can be obtained.

  That is, a second plate member is provided on a valve seat member constituting the fuel injection valve so as to cover a plate member having an injection hole for injecting fuel, and a hole portion of the second plate member is provided with a plurality of holes in the plate member. By providing so as to surround the outer peripheral side of the injection hole, for example, when fuel is injected from a plurality of injection holes, it is drawn toward the hole part side provided on the outer peripheral side of the injection hole by the Coanda effect, and the radial direction It can be sprayed to diffuse outward. As a result, at the tip of the fuel injection valve, the second plate member having the hole is provided so as to cover the plate member having the injection hole, and the injection angle of the fuel injected from the injection hole is adjusted. It becomes possible to change and inject. Moreover, since it can respond easily also by changing a 2nd plate member also with respect to plate members from which a shape, a position, etc. of an injection hole differ, it is highly versatile and suitable.

1 is an overall cross-sectional view of a fuel injection valve according to an embodiment of the present invention. It is an expanded sectional view which shows the front-end | tip vicinity of the valve seat member in the fuel injection valve of FIG. It is the front view which looked at the fuel injection valve of Drawing 1 from the valve seat member side. It is the front view which looked at the fuel injection valve by which the injector plate which concerns on a modification was used from the valve-seat member side.

  Preferred embodiments of the fuel injection valve according to the present invention will be described below and described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a fuel injection valve according to an embodiment of the present invention.

  As shown in FIG. 1, the fuel injection valve 10 includes a body 12 formed in a cylindrical shape along the axial direction, a valve housing 14 provided at the tip of the body 12, and a tip of the valve housing 14. A valve seat member 16 provided, a valve body 20 seated on a valve seat 18 of the valve seat member 16, and a resin mold portion 22 covering the outer peripheral side of the body 12 and the valve housing 14 are included.

  In the following description, the body 12 side of the fuel injection valve 10 is referred to as a base end side (arrow A direction), and the valve seat member 16 side is referred to as a distal end side (arrow B direction).

  The body 12 is made of, for example, a magnetic material, and a supply port 24 to which fuel is supplied opens on the base end side (in the direction of arrow A), and impurities and the like contained in the fuel are removed from the supply port 24. A filter member 26 for mounting is attached. The filter member 26 has a base end engaged with the base end of the body 12, and a cylindrical portion to which a mesh-like filter 28 is attached is inserted into the supply port 24.

  A fixed core portion 30 is formed on the distal end side (in the direction of arrow B) of the body 12, and a through hole 32 is formed in the interior thereof along the axial direction (in the directions of arrows A and B). The through hole 32 communicates with the supply port 24 and penetrates to the tip, and a cylindrical retainer 34 is provided therein. Further, a spring 36 is accommodated in the through hole 32 so as to abut the tip of the retainer 34.

  The valve housing 14 is formed, for example, in a cylindrical shape from a magnetic material, and a movable core 38 is provided in the inside thereof so as to be movable along the axial direction (arrows A and B directions), and at the base end side (arrow A direction). Similarly, a cylindrical spacer 40 is connected so as to be coaxial by welding or the like.

  The spacer 40 is made of, for example, a nonmagnetic material, and is connected to the valve housing 14 by being inserted into a stepped portion 42 formed on the outer peripheral surface of the fixed core portion 30 in the body 12. The outer diameters of the valve housing 14 and the spacer 40 are formed to be the same as the outer diameter of the body 12.

  On the other hand, the proximal end side of the valve seat member 16 is inserted into and fixed to the distal end of the valve housing 14.

  The movable core 38 is made of, for example, a magnetic material, and is formed on the base end side (in the direction of arrow A) and is in sliding contact with the valve housing 14, and a small diameter portion formed on the distal end side of the large diameter portion 44. 46, and a communication hole 48 is formed in the inside of the large-diameter portion 44.

  The communication hole 48 extends from the proximal end of the movable core 38 toward the distal end side (in the direction of arrow B), and extends radially outward at the small diameter portion 46 and opens to the outer peripheral surface. The base end of the communication hole 48 is engaged with one end of the spring 36 accommodated in the through hole 32 of the body 12, so that the elastic force of the spring 36 is biased against the movable core 38. And pressed in a direction away from the body 12 (arrow B direction).

  Further, the tip of the small diameter portion 46 is recessed in a conical shape toward the large diameter portion 44 side (arrow A direction), and the valve body 20 described later is connected by welding or the like.

  The movable core 38 has a predetermined interval between the proximal end of the movable core 38 and the distal end of the fixed core portion 30 in a state where the elastic force of the spring 36 is biased toward the distal end side (arrow B direction). Arranged in a state.

  The valve seat member 16 is provided on the most distal end side (in the direction of arrow B) in the fuel injection valve 10, and a valve hole 50 is formed at the center of the distal end. A concave section 52 having a circular cross section that is recessed in the direction of arrow A is formed. A disc-like injector plate (plate member) 54 is accommodated in the recess 52 and fixed by welding or the like in contact with the end surface on the valve hole 50 side.

  As shown in FIGS. 2 and 3, for example, the injector plate 54 has a plurality of (for example, four) injection holes 56 formed at positions on a predetermined circumference with respect to the center thereof. Is formed at the same time as the injector plate 54 is press-formed and penetrates in the thickness direction.

  Further, a cap member (second plate member) 58 is provided at the tip of the valve seat member 16 so as to cover the recess 52, and the cap member 58 is formed of, for example, a metal material and is accommodated in the recess 52. A base portion 60 and a holding portion 62 projecting axially and radially outward from the outer edge of the base portion 60.

  For example, the base portion 60 is formed in a flat and disk shape, abuts on the injector plate 54 in the recess 52, and a hole portion 64 that is circular and penetrates in the thickness direction is formed in the center portion thereof. The diameter of the hole 64 is set so that the plurality of injection holes 56 in the injector plate 54 are all disposed inside as shown in FIG. Specifically, the hole 64 is formed such that there is a radial distance between the inner peripheral surface thereof and the plurality of injection holes 56 arranged on a predetermined circumference.

  In other words, the hole 64 of the cap member 58 is formed so as to surround the plurality of injection holes 56 provided in the injector plate 54.

  The holding portion 62 has an outer peripheral surface slidably in contact with the inner peripheral surface of the recess 52, and a flange portion 66 extending radially outward is formed at the tip thereof. The flange portion 66 is the tip surface of the valve seat member 16. It fixes by welding etc. in the state contact | abutted to. Thereby, the cap member 58 is coaxially fixed with respect to the front-end | tip of the valve seat member 16 in the state which covered a part of injector plate 54. FIG. That is, the injector plate 54 is exposed to the outside only through the hole 64 of the cap member 58.

  Further, as shown in FIGS. 1 and 2, a conical valve seat 18 is formed in the valve seat member 16 so as to reduce the diameter toward the distal end side (arrow B direction) so as to be continuous with the valve hole 50. In addition, a guide hole 68 is formed from the valve seat 18 toward the base end side. As shown in FIG. 1, the guide hole 68 has a substantially the same diameter and opens to the proximal end side. Inside the guide hole 68 and the valve seat 18, a valve body 20 to be described later is disposed in the axial direction (arrow A, (B direction) is accommodated movably.

  A fuel collecting chamber 70 is formed on the proximal end side of the guide hole 68 and gradually expands with respect to the guide hole 68 and then extends with substantially the same diameter. The fuel collecting chamber 70 accommodates the small-diameter portion 46 of the movable core 38, communicates with the inside of the valve housing 14 and communicates with the communication hole 48 of the movable core 38.

  The valve body 20 is a sphere made of, for example, a metal material, and is connected to the tip of the small diameter portion 46 in the movable core 38, and has a plurality of fuel holes through which the fuel can flow through the guide hole 68. A flat portion 72 is formed. The flat portions 72 are provided so as to be spaced apart from each other at equal intervals along the circumferential direction of the valve body 20, and the valve body 20 integrally moves and opens as the movable core 38 moves along the axial direction. At this time, the fuel flows between the guide hole 68 and the flat portion 72.

  The resin mold part 22 is made of, for example, a resin material, and covers a body part 74 that covers the outer peripheral side of the body 12 and the valve housing 14, and a coupler part 78 that protrudes from the side of the body part 74 and accommodates the connection terminal 76. A coil housing 80 is provided inside the main body 74, and a coil assembly 82 is provided further inside the coil housing 80.

  The coil assembly 82 functions as a solenoid portion that is excited under energization, and has a bobbin 84 that contacts the outer peripheral surface of the fixed core portion 30 and the spacer 40, and a coil 86 that is wound around the outer peripheral side of the bobbin 84. The outer peripheral side of the coil housing 80 is surrounded by the coil housing 80, and the tip of the coil housing 80 is fixed to the outer peripheral surface of the valve housing 14.

  An annular O-ring 88 is provided at the base end of the main body 74 so as to be on the outer peripheral side of the body 12, and when an unillustrated fuel supply pipe is connected to the base end of the body 12, the O-ring Since 88 contacts the inner peripheral surface of the fuel supply pipe, leakage of high-pressure fuel is prevented.

  The coupler part 78 is formed in, for example, a rectangular cross section and protrudes obliquely upward so as to be inclined at a predetermined angle with respect to the axial direction (arrow A, B direction) of the main body part 74, and at the open end thereof One end of the connection terminal 76 is provided so as to be exposed. The other end of the connection terminal 76 extends into the coupler 78 and is electrically connected to the coil 86.

  The coupler 78 is connected to a connector (not shown) so that a control signal from a controller (not shown) is input to the connection terminal 76 and the coil 86 is energized.

  The fuel injection valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect will be described.

  First, when a control signal from a controller (not shown) is input to the connection terminal 76 of the coupler section 78, the coil 86 is energized and excited to generate magnetic flux. This magnetic flux flows around the fixed core 30, the coil housing 80, the valve housing 14 and the movable core 38, and the generated magnetic force causes the movable core 38 to move together with the valve body 20 toward the fixed core 30 (arrow A direction). As a result, the valve seat 18 is opened.

  When the valve seat 18 is thus opened, the valve 12 flows from the supply port 24 of the body 12 to the communication hole 48 of the movable core 38 through the through hole 32 and reaches the fuel collecting chamber 70 of the valve seat member 16. After flowing through the conical valve seat 18 to the valve hole 50 from between the flat portion 72 of the valve body 20 and the guide hole 68, the fuel flows through the injection hole 56 of the injector plate 54 (arrow). B direction).

  As shown in FIG. 2, the fuel injected from the injection hole 56 has a wide angle by being drawn toward the hole 64 side of the cap member 58 disposed on the distal end side by the Coanda effect, that is, radially outward. And sprayed to the outside (downward).

  Further, by stopping energization of the coil 86, the attractive force toward the fixed core portion 30 (in the direction of arrow A) with respect to the movable core 38 is extinguished, and the elastic core 38 causes the movable core 38 to be fixed to the fixed core portion. When the valve body 20 is pressed in the direction away from 30 (arrow B direction) and seats on the valve seat 18, the flow of the fuel to the valve hole 50 is interrupted and the injection stops.

  As described above, in the present embodiment, the valve seat member 16 constituting the fuel injection valve 10 is provided with the injector plate 54 having the injection hole 56 capable of injecting fuel at the tip thereof. Further, a cap member 58 is provided on the distal end side, and a hole 64 is formed in the cap member 58 so as to surround the outside of the plurality of injection holes 56. The fuel injected from the plurality of injection holes 56 is drawn toward the hole 64 provided on the radially outer side of the injection hole 56 by the Coanda effect, and is injected to the outside so as to diffuse in the radial direction. be able to.

  As a result, the injection angle of the fuel injected from the injection hole 56 is a wide angle with a simple configuration in which a cap member 58 having a hole 64 in the center is provided on the tip of the fuel injection valve 10 so as to cover the injector plate 54. As a result, the fuel can be mixed into the air more efficiently, thereby improving fuel efficiency and fuel consumption, and attaching the fuel to the intake port. Can be prevented.

  In other words, it is possible to reduce the penetration force at which the fuel is injected linearly from the fuel injection valve.

  Further, another injector plate 54 in which the number and position of the injection holes 56 are changed can be easily handled by replacing the injector plate 54 with a new cap member 58 in which the shape and size of the hole 64 is changed. It becomes possible.

  The injector plate 54 is not limited to the one having the axially penetrating injection holes 56 as described above. For example, in the injector plate 102 of the fuel injection valve 100 shown in FIG. Are formed in the swirl portion 106 and a swirl portion 106 that opens in a tangential direction at an outer peripheral side end portion of the radial passage 104. A nozzle hole 108 is formed.

  The injector plate 102 is formed so that the inner peripheral end of the radial passage 104 faces the valve hole 50 of the valve seat member 16 when the injector plate 102 is housed in the recess 52 of the valve seat member 16.

  On the other hand, the cap member 110 provided on the distal end side of the injector plate 102 is formed such that a hole portion 112 formed in the center thereof is on the outer peripheral side of the injection hole 108.

  In the fuel injection valve 100 having the injector plate 102 and the cap member 110 described above, the fuel that has reached the fuel collecting chamber 70 of the valve seat member 16 flows into the valve hole 50, and the radial passage of the injector plate 102. After flowing radially outward from the inner peripheral side end of 104, it turns by flowing into the swirl portion 106 and is injected while turning from the injection hole 108. At this time, the fuel is attracted to the hole 112 of the cap member 110 arranged on the outer peripheral side of the injection hole 108, and is injected so that the injection angle is widened while turning.

  In this way, by using the injector plate 102 and the cap member 110 that can be injected while swirling the fuel in combination, the fuel that is imparted with the swirling force and has low rectilinearity is injected at an injection angle that more effectively widens the angle. It becomes possible to do.

DESCRIPTION OF SYMBOLS 10,100 ... Fuel injection valve 12 ... Body 14 ... Valve housing 16 ... Valve seat member 18 ... Valve seat 20 ... Valve body 50 ... Valve hole 52 ... Recessed part 54, 102 ... Injector plate 56, 108 ... Injection hole 58, 110 ... Cap member 60 ... Base portion 62 ... Holding portion 64, 112 ... Hole portion 82 ... Coil assembly 104 ... Radial passage 106 ... Swirl portion

Claims (2)

A valve seat member having a valve seat and a valve hole penetrating the center of the valve seat, a valve body that opens and closes the valve hole by being seated and separated from the valve seat, and an end portion of the valve seat member And a fuel injection valve having a plate member having a plurality of injection holes for injecting fuel.
The valve seat member is provided with a second plate member that covers the plate member, and the second plate member is formed with a hole that surrounds an outer peripheral side of the plurality of injection holes, and the hole Has a diameter that can accommodate all of the plurality of injection holes on the inner peripheral side thereof. The fuel injection valve according to claim 1, wherein
A fuel injection valve, wherein the fuel injected from the nozzle hole is given a turning force that turns along the circumferential direction of the plate member.

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