JP2018178893A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve which enables pressure increase of a fuel injected from an injection hole and improvement of responsiveness during fuel injection.SOLUTION: A fuel injection valve 1 includes: a nozzle body 30 having an injection hole 32; an actuator part 60 having a solenoid coil 61 etc.; and a housing 10 provided between the nozzle body 30 and the actuator part 60. A control chamber 71 is provided at the injection hole side of the housing 10, and a control passage 94 extending from the control chamber 71 penetrates through the housing 10 in an axial direction. A control valve element 63 which opens or closes the control passage 94 is provided at the counter-injection hole side of the housing 10. The housing 10 has: an inner body 111 provided with the control passage 94; and an outer body 112 which houses the inner body 111. The inner body 111 is provided between an orifice plate 20 and a spacer plate 80.SELECTED DRAWING: Figure 1

Description

  The disclosure of this specification relates to a fuel injection valve.

  For example, Patent Document 1 discloses a fuel injection valve having a nozzle body in which the injection hole is formed, a solenoid valve, a holder, a needle, and a control chamber as a fuel injection valve that injects fuel from the injection hole. In this fuel injection valve, a holder is provided between the nozzle body and the solenoid valve, and the fuel pressure in the control chamber changes as fuel enters and leaves the control chamber, whereby the injection hole is opened and closed by the needle. . The control chamber is provided on the solenoid valve side of the nozzle body, and pressure changes in the control chamber are transmitted to the needle via control pins and pressure pins arranged in series inside the holder.

  Further, Patent Document 2 discloses a fuel injection valve in which a drive unit corresponding to a solenoid valve is provided between a nozzle body and a holder. In this fuel injection valve, together with the drive unit, the control chamber is also provided on the nozzle body side from the holder, and the pressure change in the control chamber is applied directly to the needle. Unlike the above-mentioned patent documents 1, this fuel injection valve does not have a control pin and a pressure pin.

Unexamined-Japanese-Patent No. 2003-97378 JP 2011-12669 A

  However, in Patent Document 1 described above, a long member such as a control pin or a pressure pin that transmits a pressure change in the control chamber to the needle due to the holder being provided between the control chamber and the nozzle body It will slide against. In this configuration, the fuel leaks into the gap between the holder and the elongated member, so that the fuel pressure in the control chamber is reduced, the sliding area is large, and the friction caused by the displacement of the needle is large. There is a concern that the response when opening and closing the injection hole may be reduced.

  Moreover, in the said patent document 2, the drive part is provided between the nozzle body and the holder. On the other hand, when it is assumed that the pressure of the fuel injected from the injection hole is increased, in order to displace the needle against the fuel pressure, it is necessary to enlarge the drive unit and increase the driving force. However, in order to accommodate the drive unit between the nozzle body and the holder, there is a limit to the increase in size of the drive unit, and a limit to the increase in fuel pressure occurs. In addition, it is conceivable to increase the size of the drive portion by thickening the nozzle body or holder, but in an internal combustion engine where a fuel injection valve is inserted into an insertion hole formed in a cylinder head or the like, the nozzle body or It is not realistic to make the holder thicker.

  As described above, in Patent Document 1 above, since the solenoid valve is disposed on the opposite side of the holder from the nozzle body, the solenoid valve can be enlarged without thickening the nozzle body or the holder. It is considered possible. On the other hand, there remains the problem that the responsiveness decreases when opening and closing the injection hole. On the other hand, in Patent Document 2 described above, since the drive portion is provided between the nozzle body and the holder, there is no need to lengthen the needle or to provide a control pin or the like. It is thought that the response when opening and closing the On the other hand, there remains a problem that there is a limit to increasing the size of the drive unit.

  The main object of the present disclosure is to provide a fuel injection valve that can increase the responsiveness of fuel injection while enabling the fuel injected from the injection hole to be pressurized.

In order to achieve the above object, the disclosed aspect is:
A fuel injection valve (1) for injecting fuel from an injection hole (32),
A nozzle body (30) having an injection hole;
A control room (71) where fuel enters and leaves,
An injection hole valve body (50) that moves to open and close the injection hole by changing the fuel pressure of the control chamber as fuel enters and leaves the control chamber;
An actuator portion (60) provided on the opposite side of the control chamber from the nozzle body and generating a driving force for causing the fuel to enter and leave the control chamber;
A housing (10) provided between the nozzle body and the actuator portion;
A control passage (94) for draining fuel from the control chamber;
A control valve body (63) provided on the side of the actuator unit of the housing for opening and closing the control passage;
Equipped with
The housing has an inner body (111) and an outer body (112) containing the inner body,
The control passage is a fuel injection valve that penetrates the inner body in the direction in which the control chamber and the actuator unit are aligned.

  According to this aspect, since the control chamber is provided on the opposite side of the housing to the actuator unit, the control chamber can be disposed at a position close to the injection hole valve body. In this case, since it is not necessary to adopt a configuration in which the long member for transmitting the pressure change in the control chamber to the needle slides relative to the housing, the movement response of the injection hole valve body is reduced and the opening / closing response of the injection hole It can suppress that the sex falls. Further, in this case, since the actuator portion is provided on the opposite side to the nozzle body across the housing, in the internal combustion engine, it is necessary to insert the actuator body as well as the nozzle body and the housing into the insertion hole of the cylinder head etc. Absent. For this reason, when the high pressure of the fuel injected from the injection hole is realized, it is possible to enlarge the actuator unit in accordance with the high pressure.

  In the above aspect, the fuel pressure in the control passage changes with the fuel pressure in the control chamber, whereby the driving force from the actuator unit is transmitted to the control chamber, so even if the long member is not used, Thus, the injection hole valve body can be moved. However, from the viewpoint of enhancing the responsiveness when the injection hole valve body moves in response to the drive of the actuator portion, it is necessary to enhance the responsiveness of pressure changes in the control chamber and the control passage. That is, it is necessary to minimize the volume of the control passage. Therefore, there is a method to make the control passage as thin as possible, but at the time of manufacturing the fuel injection valve, the work of forming a thin control passage in the housing is difficult and there is a limit to narrowing the long control passage. Conceivable. This is because in order to firmly connect the nozzle body and the actuator part in the fuel injection valve, the strength of the housing must be increased, and in order to form a control passage with a drilling tool such as an elongated drill blade in the high strength housing This is because there is a limit to the size and length of the drilling tool.

  On the other hand, according to the above aspect, in the housing, the inner body in which the control passage is formed is accommodated in the outer body. In this configuration, if the strength of the housing for firmly connecting the nozzle body and the actuator portion is ensured by the outer body, the strength is sufficient to facilitate the work of forming the control passage at the time of manufacturing the fuel injection valve. Lower members can be used as the inner body. For this reason, the drilling tool for forming the control passage in the inner body can be increased in freedom with respect to the fineness and length, and as a result, the control passage can be narrowed to an extent that the response of pressure change in the control passage can be optimized. can do.

  As described above, it is possible to increase the responsiveness of fuel injection while making it possible to increase the pressure of the fuel injected from the injection hole.

  Note that the claims and the reference numerals in the parentheses described in this section only indicate the correspondence with specific means described in the embodiments described later, and do not limit the technical scope of the invention. .

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the structure of the fuel supply system in 1st Embodiment. The enlarged view of the orifice plate periphery of FIG. The figure which shows the structure of an inner body. The enlarged view of a 1st body part periphery of FIG. The figure which shows the state which the position of the adjacent 2nd body part shifted in radial direction. The figure which shows the structure of the inner body in 2nd Embodiment. The figure which shows the structure of a 3rd body part. The figure which shows the structure of the fuel injection valve in 3rd Embodiment. The enlarged view of a spacer plate periphery of FIG. The figure which shows the structure of the fuel injection valve in 4th Embodiment. The enlarged view of the spacer plate periphery of FIG.

  Hereinafter, a plurality of embodiments of the present disclosure will be described based on the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other example described above can be applied to the other part of the configuration. Further, not only the combination of the configurations explicitly described in the description of the respective embodiments but also the configurations of the plurality of embodiments can be partially combined with each other even if the combination is not specified unless any trouble occurs in the combination. And the combination which is described in a plurality of embodiments and a modification, and is not specified between each other is also indicated by the following explanation.

First Embodiment
The fuel injection valve 1 shown in FIG. 1 is included in a fuel supply system 9. The fuel supply system 9 has a fuel tank 2, a fuel supply pump 3, a common rail 4, and a control device 5 in addition to the fuel injection valve 1. A fuel such as light oil is stored in the fuel tank 2, and the fuel supply pump 3 pressurizes the fuel pumped from the fuel tank 2 and feeds it to the common rail 4. A plurality of fuel injection valves 1 are connected via a fuel pipe 6 to a common rail 4 as a pressure accumulation container, and the common rail 4 temporarily stores high pressure fuel supplied from the fuel supply pump 3 and holds pressure It distributes to each fuel injection valve 1 as it is. The control device 5 is electrically connected to actuators such as the fuel supply pump 3 and the fuel injection valve 1, and the control device 5 performs operation control of these actuators.

  The fuel injection valve 1 is operated by the drive current output from the controller 5. The control device 5 calculates the target injection amount based on the engine load, the engine rotation speed, etc., and calculates the injection period corresponding to the target injection amount according to the pressure of the high pressure fuel supplied to the fuel injection valve 1. Then, an energization period is calculated with the injection start delay time and the injection end delay time taken into consideration with respect to the calculated injection period, and the drive current described above is output to the fuel injection valve 1 during the energization period.

  The fuel injection valve 1 is a fuel injection device for injecting fuel into a combustion chamber of an internal combustion engine such as a diesel engine, and a head portion thereof in a state inserted into an insertion hole of a cylinder head or the like forming the combustion chamber in the internal combustion engine. It is fixed against. The fuel injection valve 1 has an injection hole 32 for injecting fuel, and in order to open and close the injection hole 32, a part of high-pressure fuel supplied from the fuel pipe 6 is used. The fuel used to open and close the injection holes 32 is returned from the fuel injection valve 1 to the fuel tank 2 through the return pipe 7 as a low pressure fuel whose pressure is lower than that of the high pressure fuel.

  The fuel injection valve 1 includes a housing 10, an orifice plate 20, a nozzle body 30, connection members 41 and 42, a needle 50, an actuator portion 60 and a spacer plate 80. The housing 10 is provided between the actuator portion 60 and the nozzle body 30 in the direction in which the axis C of the fuel injection valve 1 extends (hereinafter also referred to as the axial direction). The vertical direction in FIG. 1 is the axial direction.

  The fuel injection valve 1 has a supply passage 91 and a discharge passage 92 as fuel passages through which fuel flows. The supply passage 91 connects the fuel pipe 6 and the injection hole 32, and supplies the high pressure fuel from the fuel pipe 6 to the injection hole 32. The discharge passage 92 is connected to the return pipe 7 and discharges the fuel used to open and close the injection hole 32 to the return pipe 7. The fuel flowing through the discharge passage 92 is a low pressure fuel whose pressure is lower than that of the high pressure fuel flowing through the supply passage 91.

  The connection members 41 and 42 are cylindrical fastening members such as a retailing nut, and have female screw portions 41 a and 42 a formed on the inner peripheral surface. The first connecting member 41 connects the housing 10 and the nozzle body 30. For example, in a state where the nozzle body 30 is caught inside the first connecting member 41, the housing 10 is screwed into the inside of the first connecting member 41, whereby the housing 10 and the nozzle body 30 are connected via the first connecting member 41. It is done. In this case, the male screw portion 10 a of the housing 10 and the female screw portion 41 a of the first connecting member 41 are in a state of meshing with each other. The spacer plate 80 is provided between the housing 10 and the nozzle body 30, and is in a state of being sandwiched between the housing 10 and the nozzle body 30.

  The second connecting member 42 connects the housing 10 and the actuator unit 60. For example, the housing 10 and the actuator portion 60 are mutually engaged by the second connection member 42 by screwing the housing 10 into the inside of the second connection member 42 in a state where the actuator portion 60 is caught inside the second connection member 42. It is fixed. In this case, the male screw portion 10b of the housing 10 and the female screw portion 42a of the second connecting member 42 are in a state of meshing with each other. The orifice plate 20 is provided between the housing 10 and the actuator portion 60, and is in a state of being sandwiched between the housing 10 and the actuator portion 60.

  Inside the nozzle body 30, a needle 50 as an injection hole valve body is housed slidably. An injection hole 32 is formed at the tip of the nozzle body 30. When the seat surface 52 formed on the needle 50 is separated from the seat surface 33 as a seat formed on the nozzle body 30, the needle 50 is in an open state, and the injection hole 32 is opened to cause fuel Is injected. On the other hand, when the needle 50 is seated on the seat surface 33, the needle 50 is in the valve closing state, the injection hole 32 is closed, and the fuel injection is stopped. The center line of the needle 50 coincides with the axis C.

  The actuator unit 60 includes a solenoid coil 61, an armature 62, a control valve body 63, and a spring SP1. In the actuator unit 60, a solenoid valve is configured to include the solenoid coil 61, the armature 62, and the control valve body 63. In this solenoid valve, when the above-described drive current is caused to flow to the solenoid coil 61 to generate an electromagnetic force, the armature 62 such as the solenoid valve is attracted by the electromagnetic force, and the control valve body 63 opens. On the other hand, when the solenoid coil 61 is de-energized, the armature 62 is pushed down by the elastic force of the spring SP1, and the control valve body 63 is closed. The center line of the solenoid coil 61 coincides with the axis C.

  A cylinder 70 is provided on the injection hole 32 side of the housing 10. The cylinder 70 has a cylindrical shape and is attached to the end face of the housing 10 on the injection hole side. And the non-injection hole side end of the needle 50 is inserted in a slidable state inside the cylinder 70. In the present embodiment, the injection hole 32 is referred to as the injection hole side, and the opposite side of the injection hole 32 is referred to as the non-injection hole side.

  The control chamber 71 is included in the internal space of the cylinder 70. The control chamber 71 is a chamber surrounded by the inner peripheral surface of the cylinder 70, the injection hole end face of the housing 10, and the end face of the needle 50 opposite to the injection hole. The needle 50 is in a state where it enters into the inside of the cylinder 70, and when the injection hole 32 is opened and closed, the volume of the control chamber 71 is changed by the movement of the needle 50.

  The fuel injection valve 1 has a branch passage 93 and a control passage 94 as a fuel passage. The branch passage 93 branches from the supply passage 91 and is connected to the discharge passage 92 via the control passage 94. The control passage 94 connects the branch passage 93, the discharge passage 92, and the control chamber 71. The fuel flows through the control passage 94 with the opening and closing of the control valve body 63, whereby the fuel pressure in the control chamber 71 increases or decreases. For example, when the control valve body 63 is in the closed state, the high pressure fuel from the branch passage 93 tends to flow into the control chamber 71 via the control passage 94, so that the fuel pressure in the control chamber 71 is high. The fuel pressure in the control chamber 71 is maintained or increased. When the control valve body 63 is in the open state, the fuel flows out of the control chamber 71 to the discharge passage 92 through the control passage 94, whereby the fuel pressure in the control chamber 71 is maintained at a low level. Alternatively, the fuel pressure in the control chamber 71 is reduced.

  As shown in FIG. 2, the fuel injection valve 1 has an in-orifice 95 and an out-orifice 96. The in-orifice 95 is an inflow restricting portion that restricts the inflow of fuel from the branch passage 93 to the control passage 94, and connects the branch passage 93 and the control passage 94. The out orifice 96 is an outflow restricting portion for restricting the outflow of fuel from the control passage 94 to the exhaust passage 92, and connects the control passage 94 and the exhaust passage 92. The in-orifice 95 and the out-orifice 96 are both provided in the orifice plate 20.

  The branch passage 93 has a housing branch 93 a provided in the housing 10 and a plate branch 93 b provided in the orifice plate 20. The control passage 94 includes a housing control passage 94 a provided in the housing 10 and a plate control passage 94 b provided in the orifice plate 20. The housing 10 and the orifice plate 20 are in contact with each other, in which the housing branch passage 93a and the plate branch passage 93b communicate with each other, and the housing control passage 94a and the plate control passage 94b communicate with each other .

  The in-orifice 95 connects the plate branch 93 b and the plate control path 94 b in the orifice plate 20. The plate control path 94 b includes an in-path portion 101, an out-path portion 102 and an intermediate path portion 103. The in passage portion 101 is connected to the in orifice 95, and the out passage portion 102 is connected to the out orifice 96. The intermediate path portion 103 connects the control path 94, the in path portion 101 and the out path portion 102. The in orifice 95 is connected to the upstream end of the in passage 101, and the out orifice 96 is connected to the downstream end of the out passage 102. In this configuration, the fuel flows in the intermediate passage portion 103 and the control passage 94 in the case where the fuel flows from the branch passage 93 into the in passage 101 and the case where the fuel flows out from the out passage 102 into the discharge passage 92. Turns in the opposite direction.

  The out orifice 96 is opened upward by extending from the plate control passage 94 b toward the upper end face in the orifice plate 20, and the open end is in communication with the discharge passage 92. At the contact portion between the orifice plate 20 and the actuator portion 60, the out orifice 96 and the discharge passage 92 communicate with each other. The control valve body 63 is provided in the discharge passage 92, and moves in the axial direction with the armature 62 to open and close the upper end of the out orifice 96. In the open state in which the control valve body 63 is separated upward from the orifice plate 20 and the out orifice 96 is opened, the fuel is discharged from the control passage 94 to the discharge passage 92. On the other hand, when the control valve body 63 is in contact with the orifice plate 20 to close the out orifice 96, the discharge of fuel from the control passage 94 to the discharge passage 92 is stopped.

  In the orifice plate 20, the center lines of the out orifice 96, the out passage 102, and the middle passage 103 coincide with the axis C. The center line of the orifice plate 20 also coincides with the axis C.

  Here, the operation of the fuel injection valve 1 will be described with reference to FIGS. 1 and 2.

  When the control device 5 does not perform fuel injection by the fuel injection valve 1, the drive current does not flow to the solenoid coil 61 and the armature 62 is not attracted. In this case, the biasing force by which the spring SP1 biases the control valve body 63 in the valve closing direction is greater than the pressure at which the fuel in the control passage 94 or out orifice 96 pushes the control valve body 63 in the valve opening direction. The valve body 63 is in a closed state. On the other hand, the pressure of the high pressure fuel applied to the control chamber 71 pushes the needle 50 downward, so that the needle 50 is in the valve closing state, and the fuel injection from the injection hole 32 is performed. Absent.

  On the other hand, when the control device 5 starts fuel injection by the fuel injection valve 1, a drive current is caused to flow through the solenoid coil 61 to generate an electromagnetic force for attracting the armature 62. In this case, the suction force by the electromagnetic force is larger than the biasing force of the spring SP1, and the pressure of the high-pressure fuel from the supply passage 91 is applied to the control valve body 63 via the control passage 94, so that the control valve body 63 is upward. Move to the open state. Then, the fuel is discharged from the control passage 94 to the discharge passage 92, so that the fuel pressure in the control chamber 71 decreases. This pressure becomes smaller than the pressure of the high pressure fuel in the supply passage 91, so that the needle 50 opens. Transition. Thus, fuel injection from the injection holes 32 is performed.

  Since the in-orifice 95 is provided, the amount of inflow of high pressure fuel from the supply passage 91 to the control passage 94 does not become too large when the control valve body 63 is opened. In this case, since the pressure difference between the supply passage 91 and the control chamber 71 is sufficiently large, the responsiveness when the needle 50 is opened can be enhanced.

  Then, when the control device 5 stops the fuel injection by the fuel injection valve 1, the drive current flowing to the solenoid coil 61 is stopped. In this case, as described above, when the biasing force of the spring SP1 closing the control valve body 63 is larger than the pressure of the fuel opening the control valve body 63, the control valve body 63 shifts to the valve closing state. . Then, the high pressure fuel flows from the supply passage 91 into the control passage 94, whereby the fuel pressure in the control chamber 71, which has been lowered during fuel injection, rises, and the fuel pressure in the control chamber 71 becomes sufficiently high. 50 shifts to the closed state.

  Here, since the out orifice 96 is provided, the amount of fuel flowing out from the control passage 94 to the discharge passage 92 does not become too large when the control valve body 63 is in the open state. That is, although the pressure in the control chamber 71 decreases to the extent necessary to open the needle 50, the fuel pressure in the control chamber 71 does not decrease excessively during fuel injection. Therefore, when the fuel injection from the injection hole 32 is stopped, the time required for the fuel pressure of the control chamber 71, which rises with the closing of the control valve body 63, to reach the pressure necessary for closing the needle 50 is shortened. Response, when the needle 50 is closed.

  In the fuel injection valve 1, a housing 10 is disposed between the actuator unit 60 and the control chamber 71. In this case, the actuator unit 60 and the control chamber 71 are aligned in the axial direction. This axial direction can also be referred to as the alignment direction of the actuator unit 60 and the control chamber 71. The control passage 94 passes through the housing 10 in the axial direction, and the center line of the housing control passage 94 a coincides with the axis C.

  The control passage 94 has a spacer control passage 94c axially penetrating the spacer plate 80, in addition to the housing control passage 94a and the plate control passage 94b. The supply passage 91 has a housing supply passage 91 a provided in the housing 10, a spacer supply passage 91 b provided in the spacer plate 80, and a nozzle supply passage 91 c formed by the nozzle body 30. In the contact portion between the housing 10 and the spacer plate 80, the housing control passage 94a and the spacer control passage 94c communicate with each other, and the housing supply passage 91a and the spacer supply passage 91b communicate with each other. Further, at the contact portion between the spacer plate 80 and the cylinder 70, the spacer control passage 94c and the control chamber 71 communicate with each other, and the spacer supply passage 91b and the nozzle supply passage 91c communicate with each other. The nozzle supply passage 91 c is formed by a gap between the nozzle body 30 and the needle 50 or the cylinder 70 and communicates with the injection hole 32. The branch passage 93 branches from the housing control passage 94a.

  The housing 10 has an inner body 111 and an outer body 112. Each of the bodies 111 and 112 is formed in a tubular shape as a whole, and the inner body 111 is accommodated inside the outer body 112. The inner body 111 has an elongated cylindrical shape as a whole by the housing control passage 94 a penetrating the inner body 111 in the axial direction. The outer body 112 is in the form of a long cylinder as a whole by having the accommodation holes 112a opened to the injection hole side and the counter injection hole side, respectively. In the outer body 112, a housing supply passage 91a and a branch passage 93 are formed on the outer peripheral side of the accommodation hole 112a. Each centerline of the inner body 111 and the outer body 112 coincides with the axis C.

  The orifice plate 20 and the spacer plate 80 are a pair of facing parts facing each other with the housing 10 in between, and both are fixed to the outer body 112. In this case, the orifice plate 20 may be referred to as a non-injection hole side plate, and the spacer plate 80 may be referred to as an injection hole side plate. In the housing 10, male screw parts 10a and 10b are provided on the outer peripheral surface of the outer body 112. In this case, the nozzle body 30 and the actuator portion 60 are fixed not to the inner body 111 but to the outer body 112 via the connecting members 41 and 42. Therefore, the orifice plate 20 and the spacer plate 80 are also fixed to the outer body 112 via the nozzle body 30 and the actuator unit 60. The outer body 112 is formed of a metal material, and has sufficient strength and hardness to support the plates 20 and 80, the nozzle body 30, and the actuator unit 60.

  The housing 10 has a fuel connector 113 for connecting the fuel pipe 6 to the supply passage 91. The fuel connector 113 protrudes radially outward from the outer body 112. The housing supply passage 91 a is also provided to the fuel connector 113 in addition to the outer body 112, and the fuel pipe 6 is connected to the supply passage 91 by being connected to the housing supply passage 91 a at the fuel connector 113.

  Next, the configuration of the inner body 111 will be described with reference to FIGS. 1 and 3 to 5. In FIGS. 3 and 4, the supply passage 91, the branch passage 93, the plate branch passage 93 b, the out orifice 96, and the in passage portion 101 of the orifice plate 20 are omitted.

  As shown in FIGS. 1, 3 and 4, the inner body 111 has one first body portion 121 and a plurality of second body portions 122. Each of the body parts 121 and 122 is formed of a short pillar member. The injection hole side end face and the counter injection hole side end face of the body portions 121, 121 extend in parallel to each other, and both are orthogonal to the axial direction. In the inner body 111, the first body portion 121 is disposed at the position closest to the injection hole side, and the plurality of second body portions 122 are all disposed closer to the injection hole side than the first body portion 121. . The center lines of the body portions 121 and 122 are the center lines of the inner body 111 because they coincide with each other. The first body portion 121 corresponds to an elastic body portion, and the second body portions 122 correspond to a row of body portions.

  The body portions 121 and 122 have body holes 123 as through holes penetrating the body portions 121 and 122 in the axial direction. In this case, the body portions 121 and 122 can also be referred to as cylindrical members. Further, the body portions 121 and 122 have a counterbore portion 124 communicating with the body hole 123. The center line of the body hole 123 and the center line of the counterbore 124 coincide with each other, and both of these center lines coincide with the center lines of the body portions 121 and 122. The counterbore portion 124 extends from the injection hole side end face of the body portion 121, 122 toward the opposite injection hole side, and is disposed on the injection hole side of the body hole 123 in each of the body portions 121, 122. The counterbore 124 corresponds to the expansion hole.

  The body parts 121 and 122 adjacent in the axial direction are in a state where the end face on the opposite side of the injection hole side body parts 121 and 122 and the end face on the opposite side of the injection hole side bodies 121 and 122 overlap. , Are in contact with each other. In the abutting portion, the body hole 123 of the body portion 121, 122 on the injection hole side and the counterbore portion 124 of the body portion 121, 122 on the opposite side of the injection hole communicate with each other. For example, in the first body portion 121 and the second body portion 122 adjacent to the first body portion 121, the body hole 123 of the second body portion 122 and the counterbore portion 124 of the first body portion 121 communicate with each other. doing.

  In the outer body 112, the first body portion 121 is fitted into the accommodation hole 112a, while the second body portion 122 is accommodated in the accommodation hole 112a with a gap between the first body portion 121 and the inner peripheral surface of the outer body 112. It is done. Here, the first body portion 121 has an outer diameter equal to or slightly larger than the inner diameter Da of the outer body 112 in a state where the first body portion 121 is not fitted into the receiving hole 112a, and is fitted into the receiving hole 112a. In the state, it is difficult to separate from the outer body 112.

  Here, the outer diameter D1 of the first body portion 121 is equal to the inner diameter Da of the outer body 112, while the outer diameter D2 of the second body portion 122 is smaller than the inner diameter Da of the outer body 112. In the body portions 121 and 122, the diameter D4 of the counterbore portion 124 is larger than the diameter D3 of the body hole 123. Further, in the body portions 121 and 122, the length dimension L4 of the counterbore portion 124 in the axial direction is smaller than the length dimension L3 of the body hole 123.

  In this embodiment, due to the outer diameter D2 of the second body portion 122 being smaller than the inner diameter Da of the outer body 112, there is a possibility that the adjacent second body portions 122 may be displaced in opposite directions in the radial direction. (See Figure 5). As described above, even if an axial deviation occurs, the counterbore such that the communication area between one body hole 123 of the second body portion 122 and the other counterbore portion 124 does not become smaller than the cross-sectional area of the body hole 123. The diameter D4 and the length dimension L4 of the portion 124 are set.

  For example, the diameter D4 of the counterbore 124 is set to satisfy the relationship of (D4-D3) / 2> D1-D2. The length dimension L4 is set to satisfy the relationship of L4> D3 / 4. When the cylindrical virtual space extending from the body hole 123 is assumed in the internal space of the counterbore 124, the outer circumferential surface of the cylindrical space is larger than the cross-sectional area of the body hole 123 in the relation of the length dimension L4. It shows that.

  As described above, since the diameter D4 and the length dimension L4 of the counterbore portion 124 are set, the adjacent second body portions 122 are displaced in the radial direction, so that the fuel in the control passage 94 It is less likely that the flow rate will decrease. Further, since the respective body holes 123 of the adjacent body portions 121 and 122 are communicated via the counterbore portion 124, even if the body portions 121 and 122 are slightly displaced in the radial direction, these body holes 123 do not It is avoided that it will be in the state which does not connect.

  Both the first body portion 121 and the second body portion 122 have lower strength and hardness than the outer body 112. In this case, the body parts 121 and 122 are relatively soft due to their higher flexibility than the outer body 112, and drilling and cutting are facilitated. The body portions 121 and 122 are made of, for example, a metal material or the like having a hardness lower than that of the outer body 112.

  Further, the strength and hardness of the first body portion 121 and the second body portion 122 are also different. Specifically, the first body portion 121 is lower in strength and hardness than the second body portion 122, and is easily elastically deformed by the application of an external force. That is, the elastic modulus of the first body portion 121 is higher than the elastic modulus of the second body portion 122. Therefore, when an external force is applied to the inner body 111, the first body portion 121 is more easily elastically deformed than the second body portion 122. The first body portion 121 is more flexible than the second body portion 122, and it is easier to perform drilling and cutting than either the outer body 112 or the second body portion 122.

  The length dimensions L1 and L2 of the body portions 121 and 122 are the sum of the length dimension L3 of the body hole 123 and the length dimension L4 of the counterbore portion 124. The respective length dimensions L2 of the plurality of second body portions 122 have the same value, and each has a length greater than the length dimension L1 of the first body portion 121.

  The inner body 111 is accommodated inside the outer body 112 in a state of being axially compressed by the orifice plate 20 and the spacer plate 80. Therefore, before the first body portion 121 is accommodated between the orifice plate 20 and the spacer plate 80, the length dimension La of the first body portion 121 is the length dimension L1 of the accommodated state. It is bigger than that. In this case, for the first body portion 121, the compression dimension ΔL reduced with the compression becomes the difference between the length dimensions La and L1.

  Assuming that the inner body 111 has n second body portions 122, the length dimension L of the inner body 111 in a state in which the inner body 111 is accommodated between the plates 20 and 80 is L1 + n × L2. . Here, the degree of compression of the second body portion 122 is much smaller than the degree of compression of the first body portion 121. For this reason, the length dimension of the inner body 111 in the state in which the inner body 111 is not accommodated between the plates 20 and 80 is the length dimension L of the accommodated state and the compression dimension ΔL of the first body portion 121. It is almost equal to the sum. The distance between the plates 20 and 80 is the same as the length L of the inner body 111.

  The first body portion 121 has a first main body portion 121 a and a first projecting portion 121 b protruding in the axial direction from the first main body portion 121 a. Each of the first main body portion 121 a and the first projecting portion 121 b is formed in a cylindrical shape, and the center line of each of the first main body portion 121 a and the first projecting portion 121 b coincides with the axis C. The first projecting portion 121 b extends from the first main body portion 121 a toward the reverse injection hole side, and the reverse injection hole side end face of the first protruding portion 121 b overlaps the injection hole side end face of the orifice plate 20. The outer diameter of the first body portion 121a is the outer diameter D1 of the first body portion 121, and the outer diameter D5 of the first projecting portion 121b is smaller than the outer diameter D1 of the first body portion 121a. For example, the outer diameter D5 is smaller than half of the outer diameter D1. In this case, the first protrusion 121b can also be referred to as a small diameter portion.

  The first main body portion 121a corresponds to an elastic main body portion, and the first projecting portion 121b corresponds to an elastic projecting portion. Further, in the inner body 111, the first main body portion 121a is adjacent to the second body portion 122, and the configuration in which the first projecting portion 121b protrudes from the first main body portion 121a is an inner protruding portion from the inner main body portion It corresponds to a configuration in which the part protrudes. In this case, the first projecting portion 121b corresponds to the inner projecting portion, and the first main body portion 121a and the second body portion 122 constitute the inner main body portion.

  The outer diameter D5 of the first protrusion 121b is larger than the diameter D6 of the injection hole side open end of the intermediate passage 103 of the orifice plate 20. For example, the outer diameter D5 is larger than the diameter D6 × 2. As a result, the outer diameter D5 of the first projecting portion 121b is too small, and the intermediate passage portion 103 protrudes outside the first projecting portion 121b, and the fuel is prevented from leaking out from the protruding portion.

  In the first body portion 121, the length dimension L6 of the first projecting portion 121b in the axial direction is smaller than the length dimension L5 of the first main portion 121a. For example, the length dimension L6 of the first protrusion 121b is smaller than 1⁄2 of the length dimension L5 of the first main portion 121a. This length relationship is satisfied for at least one of the state in which the first body portion 121 is compressed by the plates 20 and 80 and the state in which the first body portion 121 is not compressed. In any case, the length dimension L6 of the first protrusion 121b is set to a value such that the compression direction of the first protrusion 121b does not deviate from the axial direction when the first body portion 121 is compressed. .

  Further, the length dimension L6 of the first protrusion 121b is larger than the compression dimension ΔL of the first body portion 121. For example, the length dimension L6 is larger than the compression dimension ΔL × 2. The first projecting portion 121 b has a size and shape that is neither too short nor too thick, so that, when the inner body 111 is compressed by the plates 20 and 80, the first projecting portion 121 b is particularly the first inside of the first body portion 121. A configuration in which the protrusion 121 b is easily compressed is realized. When the first protrusion 121b is compressed, the end face of the first protrusion 121b opposite to the injection hole easily adheres to the end face of the orifice plate 20 at the injection hole, and the boundary between the first protrusion 121b and the orifice plate 20 It becomes difficult for fuel to leak out of the unit.

  In the housing 10, fuel leakage from various boundaries is regulated by the metal seal 126. The metal seal 126 is a leak regulating member that exerts a function of regulating fuel leakage by being sandwiched between members adjacent in the axial direction, and has flexibility and elasticity, and these members It is formed of a metal material or the like so as to be in close contact with the In the housing 10, the orifice plate 20 and the spacer plate 80 are pressed against the outer body 112, and the inner body 111 is sandwiched between the plates 20 and 80, thereby exhibiting the fuel leakage control function of the metal seal 126. . For example, the metal seal 126 is a control passage 94 between the first body portion 121 and the second body portion 122, between the second body portions 122 adjacent to each other, and between the second body portion 122 and the spacer plate 80. It is provided in an annular shape so as to surround in the circumferential direction. Further, the metal seal 126 is annularly provided so as to surround the accommodation hole 112 a in the circumferential direction between the outer body 112 and the orifice plate 20 and between the outer body 112 and the spacer plate 80.

  Next, an assembly procedure will be described as a method of manufacturing the fuel injection valve 1.

  First, with the metal seal 126 sandwiched between the outer body 112 and the spacer plate 80, the nozzle body 30 is aligned with the outer body 112, and the first connecting member 41 is used to position the outer body 112 and the nozzle body 30. And Then, from the side opposite to the nozzle body 30, the plurality of second body portions 122 are accommodated in order in the accommodation hole 112a of the outer body 112. Here, the metal seal 126 is attached to the end face of the second body portion 122, and the second body portion 122 is inserted into the inside of the outer body 112 together with the metal seal 126. In addition, since the outer diameter D2 of the second body portion 122 is smaller than the inner diameter Da of the outer body 112, the work of packing the plurality of second body portions 122 in order from the injection hole side and accommodating the inside of the outer body 112 Is getting easier.

  After the storage operation of the plurality of second body portions 122 is completed, the first body portion 121 is accommodated in the accommodation hole 112 a together with the metal seal 126. In this case, since the first body portion 121 is temporarily attached to the outer body 112 by fitting the first body portion 121 into the accommodation hole 112a, subsequent work can be facilitated. Then, with the metal seal 126 interposed between the outer body 112 and the orifice plate 20, the actuator portion 60 is aligned with the outer body 112, and the second body 42 and the actuator are formed using the second connecting member 42. Connect the part 60. By sufficiently tightening the connecting members 41 and 42, the plates 20 and 80 properly compress the body portions 121 and 122, and the fuel leakage restriction function is exhibited by the first projecting portion 121b of the first body portion 121 and the metal seal 126. It will be done.

  According to the embodiment described above, since the control passage 94 penetrates the housing 10 in the axial direction, the housing 10 can be disposed between the actuator portion 60 and the control chamber 71. In this case, it is not necessary to insert the needle 50 into the housing 10. For this reason, when the needle 50 is longer than the housing 10, the friction between the needle 50 and the housing 10 when opening and closing the injection hole 32 and the weight of the needle 50 increase, and the movement response of the needle 50 decreases. Is suppressed. If the driving force of the actuator unit 60 is increased against the weight increase of the needle 50, the seat surface 52 of the needle 50 and the seat surface 33 of the nozzle body 30 tend to wear due to collision with each other. This can suppress this wear. Further, as the gap between the needle 50 and the housing 10 increases, the amount of fuel discharged from the gap to the discharge passage 92 increases, and the amount of fuel supplied from the fuel tank 2 to the fuel injection valve 1 from the fuel tank 2 Is suppressed. That is, energy saving is realized by reducing the fuel supply amount by the fuel supply pump 3.

  Since the actuator portion 60 is disposed on the side opposite to the injection hole of the housing 10, the actuator portion 60 can be disposed in a portion of the fuel injection valve 1 which is not inserted into the insertion hole of the cylinder head or the like. For this reason, regardless of the size and shape of the insertion hole of the cylinder head or the like, the actuator portion 60 can be made larger in size in accordance with the increase in fuel pressure and the like. For example, in the case where the change in the injection rate is made rectangular by increasing the degree of change in the fuel injection rate accompanying the opening and closing of the injection holes 32, the large spring SP1 is generated as the fuel supplied to the supply passage 91 is pressurized. It is necessary to In this case, in order to open the control valve body 63 against the biasing force of the spring SP1, it is necessary to make the solenoid coil 61 larger by enlarging the diameter or the like in order to increase the suction force of the solenoid valve. As a result, the volume of the solenoid valve is increased and the actuator unit 60 is enlarged.

  Moreover, the housing 10 has an inner body 111 and an outer body 112. Therefore, while the strength and hardness of the outer body 112 are increased as much as possible in order to secure the strength of the fuel injection valve 1, the strength and hardness of the inner body 111 are reduced in order to improve the processability such as forming the control passage 94. be able to. As for the outer body 112, the strength of the housing 10 is sufficiently increased by the outer body 112. Therefore, the housing 10 withstands the fuel pressure and injects high-pressure fuel even if the injected fuel is highly pressurized or ultra-highly pressurized. It can inject appropriately from the hole 32. In addition, it is possible to realize the housing 10 that can withstand the vibration and heat applied from the internal combustion engine in a state where the fuel injection valve 1 is attached to a cylinder head or the like.

  With regard to the inner body 111, since the hardness is suppressed, drilling processing when forming the control passage 94, cutting when adjusting the shape of the inner body 111, and the like can be easily performed. In this case, since it becomes possible to form the control passage 94 using a drilling tool or the like as thin as possible while suppressing an increase in the degree of difficulty of the drilling operation, the control room can be reduced by minimizing the volume of the control passage 94. The open / close response of the injection hole 32 using the pressure change of 71 can be enhanced.

  Further, by making the inner body 111 elastically deformable, the inner body 111 can be accommodated between the orifice plate 20 and the spacer plate 80 in a compressed state. In this case, it becomes difficult for the fuel to leak from the control passage 94 through the boundary between the plates 20, 80 and the inner body 111 because the inner body 111 is easily in close contact with the plates 20, 80 or the like. Therefore, it is possible to suppress that the fuel pressure in the control passage 94 is reduced and the open / close responsiveness of the injection hole 32 is reduced.

  According to the present embodiment, in the configuration in which the inner body 111 and the outer body 112 are disposed between the plates 20 and 80, the plates 20 and 80 are pressed against both of the bodies 111 and 112. Therefore, relative displacement between the inner body 111 and the outer body 112 in the axial direction can be prevented. Further, in this case, since the inner body 111 and the plates 20 and 80 are easily in close contact with each other, the fuel can be prevented from leaking from the control passage 94 through the boundary between the inner body 111 and the plates 20 and 80.

  According to the present embodiment, since the first body portion 121 of the inner body 111 is elastically deformed, the first body portion 121 easily adheres to the orifice plate 20 in a state where the plates 20 and 80 are pressed against the inner body 111. It has become. Therefore, it is possible to more reliably suppress the fuel from leaking out through the boundary between the first body portion 121 and the orifice plate 20.

  According to the present embodiment, since the first projecting portion 121b is narrowed as a part of the first body portion 121, the first projecting portion 121b is elastically deformed and easily compressed in the axial direction. Moreover, when the first projecting portion 121 b is compressed so as to be axially collapsed between the first projecting portion 121 b and the outer body 112 in the radial direction, a space capable of releasing the radially expanding meat Is secured. For this reason, it can suppress that the 1st protrusion part 121b can not be compressed to an axial direction because the outer peripheral surface of the 1st protrusion part 121b contact | abuts to the inner peripheral surface of the outer side body 112. FIG.

  According to the present embodiment, since the first body portion 121 is in close contact with the orifice plate 20 in a compressed state, the fuel in the control passage 94 leaks through the boundary portion between the first body portion 121 and the orifice plate 20. It can control that. In addition, since the first projection 121b, which is elastically deformed by being thin, is in close contact with the orifice plate 20, the end face of the first body 121 opposite to the injection hole is likely to exhibit the sealing function.

  According to this embodiment, the inner body 111 has the first body portion 121 and the second body portion 122. In this configuration, when manufacturing a plurality of fuel injection valves 1 or the like, the second body portion 122 of each fuel injection valve 1 is a common component, while the first body portion 121 is a component of each fuel injection valve 1. Can be individual parts tailored to each of the Therefore, it is not necessary to use a material or member that is easily elastically deformed for the second body portion 122 for generalization, and the selection freedom regarding the material or member that forms the second body portion 122 is enhanced. be able to. Therefore, it is possible to reduce the manufacturing cost of the fuel injection valve 1 by making the second body portion 122 more versatile, or forming the second body portion 122 of a relatively inexpensive material. In this case, the first body portion 121 can also be referred to as a volume adjustment component for adjusting and replenishing the volume of the inner body 111 where the second body portion 122 runs short.

  Moreover, since the inner body 111 has a plurality of second body portions 122, the number of second body portions 122 in the inner body 111 is increased, whereby a plurality of second body portions with respect to the first body portion 121 is obtained. The ratio of 122 can be increased. Therefore, even if the first body portion 121 is formed of a special material, the first body portion 121 can be miniaturized in order to reduce the material cost. Therefore, the manufacturing cost of the fuel injection valve 1 can be reduced.

  According to the present embodiment, since the orifice plate 20 is pressed against the inner body 111, in addition to the role of having the in-orifice 95 and the out-orifice 96 in the orifice plate 20, the orifice plate 20 also has a role of compressing the inner body 111. It can be granted. Therefore, for example, the number of parts can be reduced compared to a configuration in which a dedicated part for compressing the inner body 111 is provided between the orifice plate 20 and the inner body 111.

  According to the present embodiment, since the inner body 111 is divided into the plurality of body portions 121 and 122, the body holes 123 formed in each of the body portions 121 and 122 can be shortened. In this case, the drilling tool for drilling the body hole 123 may be as long as it can penetrate one of the body portions 121 and 122, and a drilling tool as short as possible can be used when forming the body hole 123. For this reason, it is not necessary to use a dedicated tool longer than a general drilling tool, and it is possible to suppress the drilling tool from being broken or broken during drilling. Therefore, the work load when forming the control passage 94 which is as thin as possible and has a small volume can be reduced.

  According to the present embodiment, in the body portions 121 and 122, the counterbore portion 124 is connected to the body hole 123. For this reason, even if the body portions 121 and 122 adjacent in the axial direction are displaced in the radial direction, one body hole 123 and the other spot facing portion 124 can be communicated. In addition, since the communication area is properly secured by properly setting the size and shape of the counterbore portion 124, the fuel flow rate is insufficient at the boundary portion between the adjacent body portions 121 and 122. You can avoid that.

  According to the present embodiment, the supply passage 91 is provided in the outer body 112, so that the strength of the outer body 112 can be increased in order to optimize the strength of the fuel injection valve 1, the supply that withstands the high pressure of the fuel. The passage 91 will also be realized. For example, unlike the present embodiment, in the configuration in which the supply passage 91 is provided in the inner body 111, the high pressure of the fuel in the supply passage 91 is due to the strength of the inner body 111 being lower than the strength of the outer body 112. Will be limited.

Second Embodiment
In the second embodiment, as shown in FIG. 6, the inner body 111 has a third body portion 131 in addition to the first body portion 121 and the second body portion 122. In the present embodiment, differences from the first embodiment will be mainly described.

  The third body portion 131 is lower in strength and hardness than the second body portion 122, and is higher in flexibility and elastic modulus than the second body portion 122. Specifically, the third body portion 131 has substantially the same strength, hardness, flexibility, and elastic modulus as the first body portion 121, and is formed of the same material as the first body portion 121. On the other hand, the third body portion 131 has the same shape and size as the second body portion 122. The third body portion 131, like the first body portion 121, corresponds to an elastic body portion.

  A plurality of third body portions 131 are provided closer to the injection hole than the first body portion 121. The third body portion 131 and the second body portion 122 are alternately disposed in the axial direction so that the second body portion 122 is disposed at a position adjacent to the first body portion 121. In the present embodiment, as in the first embodiment, the first protrusion 121b corresponds to the inner protrusion, while the third body 131 is added to the first body 121a and the second body 122. It constitutes an inner main body.

  In the present embodiment, each of the second body portion 122 and the third body portion 131 has a common main body portion 134, a bulging portion 135 and a recess portion 136. The common body portion 134 is formed in a cylindrical shape, and the bulging portion 135 bulges from the end face on the injection hole side of the common body portion 134 toward the injection hole, and the recess 136 is the end face on the non-injection hole side of the common body portion 134 Is recessed toward the injection hole side. The bulging portion 135 and the recess portion 136 are both disposed at the radial center of the common main body portion 134, and the center lines of the common body portion 134, the bulging portion 135 and the recess portion 136 are the body portions 122 and 131. And the center line of the body hole 123.

  The structure of the common main-body part 134, the bulging part 135, and the recessed part 136 is demonstrated, illustrating the 3rd body part 131 shown in FIG. The second body portion 122 has the same shape and size as the third body portion 131, and thus the illustration is omitted.

  As shown in FIG. 7, the bulging portion 135 gradually narrows as it approaches the injection hole side. Specifically, the bulging portion 135 gradually becomes thinner as it approaches the tip portion, and the outer peripheral surface of the bulging portion 135 is curved so as to bulge toward the injection hole side. In this case, the bulging portion 135 has a shape in which a part of the sphere protrudes from the body portions 122 and 131 to the injection hole side. In the bulging portion 135, the body hole 123 passes through the top of the bulging portion most toward the injection hole side. The proximal end of the bulging portion 135 is thinner than the common main body portion 134. The outer diameter D12 of the base end portion of the bulging portion 135 is smaller than the outer diameter D11 of the common main body portion 134. The outer diameter D11 of the common main body portion 134 is the outer diameter of the body portions 122 and 131.

  The outer diameter D1 (not shown) of the first body portion 121 has the same value as the outer diameter D11 of the common main body portion 134. In this case, the first body portion 121 is not fitted in the accommodation hole 112 a of the outer body 112, and a gap is formed between the first body portion 121 and the outer body 112. For this reason, in the assembly process of the fuel injection valve 1, the operation of accommodating the first body portion 121 in the accommodation hole 112 a becomes easy as in the second body portion 122 and the third body portion 131.

  Further, the body portions 122 and 131 have a convex portion 138 which protrudes from the common main body portion 134 toward the injection hole side. The protrusion 138 extends along the peripheral edge of the end face of the common main body 134 on the injection hole side, and the dimension of extension from the common main body 134 is smaller than the size of the bulging portion 135. Further, the convex portion 138 is disposed at a position spaced apart radially outward from the bulging portion 135. In addition, illustration of the convex part 138 is abbreviate | omitted in FIG.

  The recessed portion 136 is gradually narrowed as it approaches the injection hole side. Specifically, the recessed portion 136 is tapered toward the injection hole side to a certain degree, and the inner peripheral surface of the recessed portion 136 is an inclined surface inclined with respect to the center line of the recessed portion 136 . Also, the internal space of the recess 136 is conical. The open end of the recess 136 is thinner than the common body portion 134. In the recess 136, the body hole 123 passes through the top recessed most toward the injection hole side. The inner diameter D13 of the open end of the recess 136 is smaller than the outer diameter D11 of the common main body portion 134. Further, the inner diameter D13 is larger than the outer diameter D12 of the proximal end portion of the bulging portion 135.

  In the inner body 111, one bulging portion 135 of the adjacent body portions 122 and 131 is in a state in which the other bulging portion 136 is inserted. For example, the bulging portion 135 of the second body portion 122 on the side opposite to the injection hole is in a state of entering into the recessed portion 136 of the third body portion 131 on the injection hole side. In this case, the axially intermediate portion of the bulging portion 135 abuts on the axially intermediate portion of the recessed portion 136, and the abutted portion has an annular shape so as to surround the control passage 94 in the circumferential direction. ing. Here, since the inner peripheral surface of the recessed portion 136 is an inclined surface, the bulging portion 135 can easily enter the back side of the recessed portion 136 by coming into contact with the inner peripheral surface of the recessed portion 136. In this case, when the bulging portion 135 enters the back side of the recessed portion 136, the center lines of the adjacent body portions 122 and 131 are easily aligned, and the body portions 122 and 131 are not easily displaced in the radial direction. Become. Therefore, the body holes 123 of the body portions 122 and 131 can be easily aligned in the axial direction.

  Here, in the internal space of the recess 136, it is a gap between the inner peripheral surface of the recess 136 and the outer peripheral surface of the bulge 135 on the back side of the contact portion where the bulge 135 abuts. A back side gap 137 is formed. The back side gap 137 communicates with the body hole 123 and forms a control passage 94 together with the body hole 123. In the present embodiment, the counterbore portion 124 is not formed in the body portions 121, 122, 131, and the control passage 94 does not include the counterbore portion 124 either.

  In terms of reducing the volume of the control passage 94, the back side gap 137 is preferably as small as possible. On the other hand, in the present embodiment, the back side clearance 137 is minimized as much as the second body portion 122 and the third body portion 131 are alternately arranged. This is because the third body portion 131 having high flexibility is deformed by the pressing of the second body portion 122 having low flexibility at the abutting portions of the body portions 122 and 131. , 131 is increased. For example, at the portion where the bulging portion 135 of the second body portion 122 gets into the recessed portion 136 of the third body portion 131, the volume of the back side gap 137 is reduced by the deformation of the recessed portion 136. Further, at the portion where the bulging portion 135 of the third body portion 131 gets into the recessed portion 136 of the second body portion 122, the bulging portion 135 is deformed and the volume of the back side gap 137 is reduced.

  In the state where one bulging portion 135 of the adjacent body portions 122 and 131 enters the other recessed portion 136, one convex portion 138 is pressed against the other end face of the non-injection hole side. There is. For this reason, even if fuel is present outside the recessed portion 136 at the boundary between adjacent body portions 122 and 131, this fuel is radially outward from between the protruding portion 138 and the common main body portion 134. Leakage is suppressed.

  In the present embodiment, in addition to the second body portion 122 and the third body portion 131, the first body portion 121 has a bulging portion 135, and the spacer plate 80 has a recess 136. In the first body portion 121, the bulging portion 135 bulges from the first main body portion 121a toward the injection hole side, and the center line of the bulging portion 135 is the body hole 123 of the first body portion 121. It corresponds to the center line. The first body portion 121 does not have the recessed portion 136, and in the first body portion 121, the first main body portion 121a is disposed between the bulging portion 135 and the first projecting portion 121b.

  In the spacer plate 80, the recess 136 is recessed from the end face of the spacer plate 80 opposite to the injection hole toward the injection hole, and the center line of the recess 136 coincides with the center line of the spacer control path 94c. There is. In this case, if the center line of the spacer control path 94c coincides with the axis C, all the body portions 121 can be obtained by the bulging portion 135 on the opposite side of the injection hole entering the recessed portion 136 on the injection hole side in each member. , 122, 131 easily align with the axis C. In the present embodiment, the center lines of all the body parts 121, 122, and 131 coincide with the axis C. For this reason, even if the control passage 94 does not have the counterbore portion 124, these body portions 121, 122, 131 are displaced in the radial direction at the boundary portions of the adjacent body portions 121, 122, 131 and the control passage It is suppressed that the cross-sectional area of 94 becomes small too much.

  In the inner body 111, a metal seal 126 is provided at a contact portion between the bulging portion 135 and the recess portion 136. Specifically, the metal seal 126 is sandwiched between the bulging portion 135 and the recess portion 136, and the degree of deformation of one of the bulging portion 135 and the recess portion 136 included in the second body portion 122 As a result, there is a portion where the bulging portion 135 and the recess portion 136 directly abut. The metal seal 126 is annularly provided so as to circumferentially surround the control passage 94.

  According to the present embodiment, the second body parts 122 having relatively low flexibility are not adjacent to each other, and the second body part 122 is a first body part 121 or a third body part having relatively high flexibility. It is adjacent to 131. In this configuration, the first body portion 121 or the third body portion 131 easily adheres to the second body portion 122. Therefore, it is possible to more reliably suppress the fuel from leaking from the control passage 94 through the boundary between the second body portion 122 and the first body portion 121 or the third body portion 131. Moreover, since the spacer plate 80 is adjacent to the third body portion 131, it is possible to more reliably suppress the fuel from leaking out from the boundary between the spacer plate 80 and the third body portion 131.

Third Embodiment
In the first embodiment, the in-orifice 95 is provided in the orifice plate 20, but in the third embodiment, the in-orifice 95 is provided in the spacer plate 80, as shown in FIGS. In the present embodiment, differences from the first embodiment will be mainly described.

  In the present embodiment, unlike the first embodiment, the fuel used for opening and closing the injection holes 32 is not supplied from the supply passage 91 to the control passage 94, and the control chamber 71 is not provided via the control passage 94. Supplied to Specifically, the branch passage 93 does not branch from the housing supply passage 91 a of the control passage 94, but branches from the spacer supply passage 91 b, and the entire branch passage 93 is provided in the spacer plate 80. . The in-orifice 95 extends from the end face of the spacer plate 80 on the injection hole side to the opposite side of the injection hole, thereby connecting the branch passage 93 and the control chamber 71.

  The operation of the fuel injection valve 1 in the present embodiment will be described. When the control valve body 63 shifts to the open state at the start of fuel injection, the fuel is discharged from the control passage 94 to the discharge passage 92 and the fuel pressure in the control chamber 71 and the control passage 94 as in the first embodiment. Decreases, and the needle 50 shifts to the open state, and fuel injection from the injection hole 32 is performed. In this case, since the volume of the control passage 94 is reduced as much as possible by making the control passage 94 as thin as possible, the fuel pressure in the control chamber 71 is easily reduced. As a result, the needle 50 opens. Response is properly maintained.

  On the other hand, when the control valve body 63 shifts to the closed state at the time of stopping the fuel injection, the high pressure fuel flows from the supply passage 91 into the control chamber 71 unlike the first embodiment, thereby lowering during fuel injection. The fuel pressure in the control chamber 71 and the control passage 94 increases. As a result, the needle 50 shifts to the valve closing state, and the fuel injection from the injection hole 32 is stopped. Even in this case, the fuel pressure in the control chamber 71 is easily increased by reducing the volume of the control passage 94 as much as possible. As a result, the responsiveness can be properly maintained when the needle 50 is closed. .

  As described above, in the present embodiment, the fuel flowing out of the control chamber 71 passes through the control passage 94, while the fuel flowing into the control chamber 71 does not pass through the control passage 94. In this configuration, the fuel injection from the injection hole 32 is performed by dividing the inner body 111 into a plurality of body portions 121 and 122 and making the control passage 94 as thin as possible. Excessive pressure drop is suppressed. For this reason, by stopping the fuel injection from the injection hole 32, the time required for the fuel pressure in the control chamber 71 and the control passage 94 to recover is shortened, and the interval to the next fuel injection can be shortened. Become.

  According to this embodiment, the orifice plate 20 is provided with the in orifice 95, and the spacer plate 80 is provided with the out orifice 96. In this case, each of the orifice plate 20 and the spacer plate 80 has a function as an orifice that restricts the flow rate of fuel, in addition to the function as a pair of opposing parts that axially compress the inner body 111. become. Therefore, the number of parts can be reduced as compared with a configuration in which a pair of dedicated parts are provided as the pair of facing parts in addition to the plates 20 and 80.

Fourth Embodiment
In the fourth embodiment, the fuel injection valve 1 has a movable plate movable to a restricted position for restricting the inflow of fuel from the supply passage 91 to the control chamber 71 and a permitted position for permitting the inflow. There is. In the present embodiment, differences from the third embodiment are mainly described.

  As shown in FIGS. 10 and 11, the movable plate 140 is accommodated in the control chamber 71 so as to be movable in the axial direction. When the movable plate 140 is in the restricted position, the movable plate 140 overlaps the injection hole side end face of the spacer plate 80 to close the in-orifice 95 of the spacer plate 80, and the fuel from the branch passage 93 to the control chamber 71. Regulate the influx of Further, when the movable plate 140 is in the permission position, the in-orifice 95 of the spacer plate 80 is opened by being away from the end face of the spacer plate 80 on the injection hole side. Allows fuel to flow to 71

  The movable plate 140 has a movable passage 141 and a movable orifice 142. The movable passage 141 extends from the injection hole side end face of the movable plate 140 toward the opposite injection hole side, and the movable orifice 142 extends from the opposite injection hole side end face of the movable plate 140 toward the injection hole side. The movable passage 141 and the movable orifice 142 are connected at an intermediate position of the movable plate 140 in the axial direction. The movable orifice 142 is disposed on the injection hole side of the spacer control passage 94c, and the spacer control passage 94c is connected to the control chamber 71 via the movable orifice 142 and the movable passage 141 even when the movable plate 140 is in the restricted position. It is in communication.

  The cross sectional area of the movable orifice 142 is equal to or less than the cross sectional area of the out orifice 96. Therefore, when the fuel flows through both the movable orifice 142 and the out orifice 96, the flow rate is likely to be defined by the cross-sectional area of the movable orifice 142. Further, the fuel injection valve 1 has a biasing member (not shown) such as a spring that biases the movable plate 140 toward the regulation position. The biasing member is provided, for example, on the injection hole side of the movable plate 140.

  The operation of the fuel injection valve 1 in the present embodiment will be described. When the control valve body 63 is shifted to the open state at the start of fuel injection with the movable plate 140 in the restricted position by the biasing force of the biasing member, the control chamber 71 to the movable passage 141, the movable orifice 142 and the control passage Fuel is discharged to the discharge passage 92 through 94. In this case, unlike the third embodiment, since the inflow of high-pressure fuel from the branch passage 93 to the control chamber 71 is restricted by the movable plate 140, the rate of decrease of the fuel pressure in the control chamber 71 is improved. As a result, the responsiveness when the needle 50 opens can be enhanced. Moreover, since the amount of fuel discharged from the control chamber 71 to the discharge passage 92 is defined by the movable orifice 142, it is possible to prevent the fuel pressure in the control chamber 71 from being excessively reduced after the needle 50 is opened. As described above, in the configuration in which the control chamber 71 and the control passage 94 communicate with each other through the movable orifice 142, the sensitivity of the control passage 94 is lowered when the pressure in the control chamber 71 decreases. Therefore, the degree of freedom can be enhanced with respect to the volume of the control passage 94 defined by the diameters D3, D4 and the length dimensions L3, L4 of the body hole 123 and the counterbore 124.

  On the other hand, when the control valve body 63 shifts to the valve closing state when fuel injection is stopped, the movable plate 140 moves to the permission position against the biasing force of the biasing member, whereby the control passage 71 is moved to the control chamber 71. High pressure fuel flows in. In this case, since the fuel pressure in the control chamber 71 is not excessively reduced, the fuel pressure in the control chamber 71 is rapidly increased. As a result, the responsiveness when the needle 50 is closed is enhanced. Then, when the fuel pressure in the control chamber 71 increases to some extent, the movable plate 140 moves to the restricted position by the biasing force of the biasing member.

(Other embodiments)
As mentioned above, although a plurality of embodiments by this indication were described, the present disclosure is not interpreted by limiting to the above-mentioned embodiment, and is applied to various embodiments and combination within the range which does not deviate from the gist of this indication. can do.

  As a first modification, in the first embodiment, the counter bore portion 124 is provided on the injection hole side of the body hole 123 in each of the first body portion 121 and the second body portion 122. May be provided on the counter injection hole side of the body hole 123. For example, in the body portions 121 and 122, the counterbore portion 124 is provided on each of the injection hole side and the counter injection hole side of the body hole 123. In this configuration, in the adjacent body portions 121 and 122, the respective counter bore portions 124 communicate with each other. For this reason, for example, the diameter D4 of the spot facing portion 124 can be made smaller than that in the configuration in which the spot facing portion 124 is provided on only one of the injection hole side and the counter injection hole side of the body hole 123.

  As a modification 2, in the said 2nd Embodiment, the bulging part 135 and the recessed part 136 should just be a shape which regulates that the body parts 121, 122, and 131 position-displace in a radial direction. For example, in the case where the bulging portion 135 is a reduced-diameter portion such as a conical shape or a pyramid shape whose outer diameter gradually decreases toward the injection hole side, the recess portion 136 has a shape in which the bulging portion 135 can enter. The inner diameter may not be gradually reduced toward the injection hole side as long as the size is large. Also in this configuration, the position of the body portion 121, 122, 131 in the direction orthogonal to the axial direction by a part of the outer peripheral surface of the bulging portion 135 abutting on the open side end portion or the inner peripheral surface of the recessed portion 136 Deviation is suppressed. Further, the bulging portion 135 may be formed by bulging the entire injection hole side end surface of the body portion 121, 122, 131.

  Further, in the case where the recessed portion 136 is a reduced diameter portion in which the inner diameter gradually decreases toward the injection hole side, the bulging portion 135 has a shape and a size that can enter the recessed portion 136. The outer diameter may not gradually decrease toward the side. Even in this configuration, when a part of the injection hole side peripheral part of the bulging part 135 or a part of the outer peripheral surface abuts on the inner peripheral surface of the recessed part 136, positional deviation of the body parts 121, 122, 131 is suppressed. Ru.

  As a third modification, in the second embodiment, the bulging portion 135 bulges toward the injection hole side, and the recess 136 is concave toward the injection hole side. However, the bulging portion 135 is opposite to the injection hole side The recess 136 may be recessed toward the opposite side of the injection hole. For example, with respect to the adjacent body portions 122 and 131, the second body portion 122 on the non-injection hole side is formed by the bulge portion 135 of the third body portion 131 on the injection hole side bulging toward the anti-injection hole side. It has entered into the inside of the dent 136 of. Even in this configuration, displacement of the body portions 121, 122, and 131 in the radial direction is suppressed.

  As a fourth modification, in the second embodiment, the second body portion 122 and the third body portion 131 may have different shapes and sizes. For example, the second body portion 122 and the third body portion 131 have different length dimensions. Even with this configuration, each of the second body portion 122 and the third body portion 131 can be generalized.

  As a fifth modification, in the second embodiment, the second body portion 122 and the third body portion 131 may not be alternately arranged. For example, the second body portions 122 may be disposed adjacent to each other, or the third body portions 131 may be disposed adjacent to each other. In addition, the third body portion 131 may be disposed at a position adjacent to the first body portion 121.

  As a sixth modification, in each of the above embodiments, the first body portion 121 is not disposed at the end of the inner body 111 opposite to the injection hole but at an intermediate position in the axial direction or at the injection hole end. It may be done. For example, in the first embodiment, the first body portion 121 is disposed at an intermediate position. In this configuration, the second body portion 122 with relatively low flexibility abuts on each of the orifice plate 20 and the spacer plate 80, but even in this case, the second body portion 121 is compressed. The body portion 122 is pressed against the plates 20, 80. For this reason, it is suppressed that a fuel leaks out from the boundary part of the 2nd body part 122 and plate 20,80. In the configuration in which the first body portion 121 is disposed at the middle position, the first protrusion 121b is also disposed at the middle position of the inner body 111 in the axial direction.

  As a seventh modification, in each of the above-described embodiments, the first body portion 121 may not have higher flexibility or elastic modulus than the second body portion 122. When this configuration is applied to the first embodiment, both the first body portion 121 and the second body portion 122 are less likely to be elastically deformed, but even in this case, body holes formed in each of the body portions 121 and 122 There is no change in being able to make 123 shorter. In addition, when the above configuration is applied to the second embodiment, even if the first body portion 121 and the second body portion 122 are less likely to be elastically deformed, the third body portion 131 is elastically deformed so that the inner body 111 is It is possible to be compressed.

  As a modified example 8, in each of the above-described embodiments, the flexibility and the elastic modulus of the plurality of body portions of the inner body 111 may be all the same. For example, in the first embodiment, the plurality of body portions of the inner body 111 are all configured as the second body portion 122. Even in this configuration, the body holes 123 formed in each of the second body portions 122 can be shortened.

  As a ninth modification, in each of the above-described embodiments, the inner body 111 may have a plurality of first body portions 121. For example, in the first and second embodiments, in addition to the end position on the side opposite to the injection hole adjacent to the orifice plate 20, the first body portion 121 is located at the end position on the injection hole side adjacent to the spacer plate 80. It is assumed to be provided. In this configuration, the first body portion 121 at the end position on the injection hole side is disposed with the first projection 121b facing the injection hole side, and the first projection 121b is in close contact with the spacer plate 80. It is in the state. Therefore, it is possible to more reliably suppress the fuel from leaking out from the boundary between the first body portion 121 and the spacer plate 80.

  As a modified example 10, in each of the above-described embodiments, the inner body 111 may have only one body portion. Even if the body portion of the inner body 111 is either the first body portion 121 or the second body portion 122, a configuration in which the hardness of the inner body 111 is lower than the hardness of the outer body 112 can be realized. Therefore, after appropriately securing the strength of the fuel injection valve 1 by the outer body 112, it is possible to select as the inner body 111 a member which is easy to process such as drilling. Here, by selecting a member having a relatively high elastic modulus as the inner body 111, the inner body 111 is compressed by the plates 20 and 80, so the boundary portion between the plates 20 and 80 and the inner body 111 causes fuel Can be prevented from leaking out.

  As a modification 11, in each of the above-described embodiments, the first body portion 121 may not have the first protrusion 121b. Even in this case, the entire first body portion 121 is compressed, whereby the adhesion between the first body portion 121 and the orifice plate 20 can be enhanced.

  As a modification 12, in each of the above-described embodiments, the supply passage 91 may not be formed in the outer body 112. For example, the supply passage 91 may be formed in the inner body 111, or may be formed by a gap between the inner body 111 and the outer body 112.

  DESCRIPTION OF SYMBOLS 1 ... fuel injection valve, 10 ... housing, 20 ... orifice plate as opposing part, 30 ... nozzle body, 32 ... injection hole, 50 ... needle as injection hole valve body, 60 ... actuator part, 63 ... control valve body, 71 ... Control chamber, 80 ... Spacer plate as opposed part, 91 ... Supply passage, 92 ... Discharge passage, 94 ... Control passage, 95 ... In-orifice as inflow restriction, 96 ... Out-orifice as outflow restriction, 111 ... Inner body, 112: Outer body, 121: First body portion as elastic body portion, 121a: First main body portion as elastic main body portion and inner main body portion, 121b: First projection as elastic projection portion and inner projection portion Part, 122 ... second body part as a row body part and the inner main body part, 123 ... body hole, 124 ... spot facing part as an expansion hole, 131 ... bullet The third body portion of the body portion and the inner body portion.

Claims (12)

A fuel injection valve (1) for injecting fuel from an injection hole (32),
A nozzle body (30) having the injection hole;
A control chamber (71) through which the fuel enters and leaves;
An injection hole valve body (50) that moves to open and close the injection hole as the fuel pressure in the control chamber changes as the fuel enters and leaves the control chamber;
An actuator portion (60) provided on the opposite side to the nozzle body across the control chamber and generating a driving force for causing the fuel to enter and exit the control chamber;
A housing (10) provided between the nozzle body and the actuator portion;
A control passage (94) for discharging the fuel from the control chamber;
A control valve body (63) provided on the side of the actuator unit of the housing for opening and closing the control passage;
Equipped with
The housing comprises an inner body (111) and an outer body (112) housing the inner body,
The fuel injection valve, wherein the control passage penetrates the inner body in a direction in which the control chamber and the actuator unit are aligned. It has a pair of opposing parts (20, 80) facing each other across the outer body and the inner body in the arranging direction,
The pair of opposing portions are pressed against the inner body and the outer body, respectively.
The fuel injection valve according to claim 1, wherein the control passage is provided in at least one of the pair of facing portions. The inner body has an elastic body portion (121, 131) that elastically deforms in the alignment direction, and the elastic body portion is accommodated between the pair of opposing portions in a state of being compressed in the alignment direction. ,
The fuel injection valve according to claim 2, wherein the control passage penetrates the elastic body portion in the alignment direction. The elastic body portion has an elastic main body (121a) and an elastic projection (121b) projecting from the elastic main body in the arranging direction,
The fuel injection valve according to claim 3, wherein the control passage penetrates each of the elastic main body and the elastic protrusion in the alignment direction.   The elastic body portion is adjacent to at least one of the pair of facing portions in the arranging direction, and is in close contact with the opposing portion in a state of being compressed in the arranging direction. Fuel injection valve. The inner body is
The elastic body portion has a lower modulus of elasticity than the elastic body portion, and has a row body portion (122) arranged in the arranging direction with respect to the elastic body portion,
The fuel injection valve according to any one of claims 3 to 5, wherein the control passage penetrates the side body portion in the side-by-side direction in addition to the elastic body portion. A discharge passage (92) for discharging fuel from the control passage;
An outflow restricting portion (96) for restricting the outflow of the fuel from the control passage to the discharge passage;
Equipped with
The fuel injection valve according to any one of claims 2 to 6, wherein the outflow restricting portion is provided on one of the pair of facing portions. A supply passage (91) for supplying fuel to the injection hole;
An inflow restricting portion (95) for restricting the inflow of fuel from the supply passage to the control passage;
Equipped with
The fuel injection valve according to claim 7, wherein the inflow restriction portion is provided in one of the pair of facing portions where the outflow restriction portion is not provided. The inner body has a plurality of body parts (121, 122, 131) provided in the alignment direction,
The fuel injection valve according to claim 1, wherein the control passage passes through each of the plurality of body portions in the alignment direction. The body part is
The body holes (123) extending in the row direction;
An expansion hole (124) which is provided so as to extend over the end face of the body portion and the body hole in the alignment direction, and is expanded than the body hole;
And have
The fuel injection valve according to claim 9, wherein the control passage includes the body hole and the expansion hole. The inner body is
An inner main body (121a, 122),
An inner projection (121b) elastically deformable in the alignment direction and projecting from the inner main body in the alignment direction;
And have
The fuel injection valve according to claim 1, wherein the control passage penetrates each of the inner main body and the inner projection in the alignment direction.   The fuel injection valve according to any one of claims 1 to 11, wherein a supply passage (91) for supplying the fuel to the injection hole and the control passage is provided in the outer body.

Images