JP2010150976A - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
JP2010150976A
JP2010150976A JP2008328425A JP2008328425A JP2010150976A JP 2010150976 A JP2010150976 A JP 2010150976A JP 2008328425 A JP2008328425 A JP 2008328425A JP 2008328425 A JP2008328425 A JP 2008328425A JP 2010150976 A JP2010150976 A JP 2010150976A
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Prior art keywords
fuel
injection valve
outer diameter
passage unit
fuel passage
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JP2008328425A
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JP4985636B2 (en
Inventor
Yoshitomo Oguma
義智 小熊
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Denso Corp
株式会社デンソー
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Abstract

Provided is a fuel injection valve (10) that can absorb axial misalignment between a fuel supply pipe (1) and an assembly hole (4) without using a separate aligning ring as in the prior art.
A fuel injection valve is divided into a fuel passage unit, a coil unit, and a lower housing, and is aligned with a conventional fuel injection valve between the fuel passage unit and the lower housing. A contact support structure with the ring is formed.
As a result, the fuel passage unit 11 can be tilted in the lower housing 20, so that the axial misalignment between the fuel supply pipe 1 and the assembly hole 4 can be injected without using a separate aligning ring as in the prior art. It can be absorbed inside the valve 10.
[Selection] Figure 1

Description

  The present invention relates to a fuel injection valve that injects fuel supplied from a fuel supply pipe into an internal combustion engine.

  In the assembly structure of the fuel injection valve shown in Patent Document 1 below, the step portion (24) at the tip of the fuel injection valve (2) has a spherical shape centered on the axis of the fuel injection valve (2). In addition, a clearance is provided between the stepped portion (28) of the assembly hole (4) of the cylinder head (3) and the inner peripheral surface of the assembly hole (4) on the insertion side of the fuel injection valve (2). An aligning ring (12) is provided.

  The inner diameter of the receiving surface of the spherical surface (11) is spherical (11) so that the inner peripheral surface of the aligning ring (12) supports the spherical surface (11) of the step portion (24) of the fuel injection valve (2). ) Of the fuel injection valve (2) by contact with the spherical surface (11) of the stepped portion (24) of the fuel injection valve (2) and the inner peripheral conical surface of the alignment ring (12). 2) is supported and assembled to the cylinder head (3).

Thus, the axial deviation between the fuel rail (1) and the assembly hole (4) of the cylinder head (3) can be absorbed by the inclination of the fuel injection valve (2), and the O-ring (5) for performing fuel sealing, and It is possible to prevent the seal ring (8) that performs gas sealing from being compressed.
Japanese Patent No. 4034662

  However, in the assembly structure shown in the above-mentioned Patent Document 1, a centering ring (12) is required to absorb the shaft misalignment, and the fuel injection valve (2) is assembled to the cylinder head (3). In order to facilitate this, it is necessary to fit the aligning ring (12) into the fuel injection valve (2) in advance and prevent it from falling off with a retaining ring or the like, which increases the cost.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to assemble the fuel supply pipe without using a separate aligning ring as in the prior art. An object of the present invention is to provide a fuel injection valve capable of absorbing an axial deviation from a hole. In addition, the code | symbol in the parenthesis as described in a background art and the problem which said invention tends to solve is matched with the code | symbol in the said patent document.

In order to achieve the above object, the present invention employs the following technical means. That is, in the invention according to claim 1, in the fuel injection valve for injecting the fuel supplied from the fuel supply pipe (1) into the internal combustion engine,
A fuel passage is formed from a fuel inlet (16) disposed at one end in the axial direction and connected to the fuel supply pipe (1) to an injection hole (23) disposed at the other end in the axial direction to inject fuel. And a fuel passage unit containing a valve member (24) for intermittently injecting fuel from the nozzle hole (23) and core members (33, 40) for moving the valve member (24) in the axial direction ( 11), a coil (32) disposed around the outer periphery of the fuel passage unit (11) and generating a magnetic attractive force between the core members (33, 40) in the fuel passage unit (11), and a coil ( 32) a coil unit (30) having a connector part (35) for supplying power, and a magnetic field generated around the outer periphery of the fuel passage unit (11) and the coil unit (30) and generated by the coil (32). Part of magnetic circuit through which magnetic flux flows And a housing (20) which forms,
The fuel passage unit (11) is formed in such a shape that the outer diameter becomes smaller toward the nozzle hole (23) side, and from the first outer diameter portion (111) and the first outer diameter portion (111). A radius (R1) having a center on the axis between the second outer diameter portion (112) having a small outer diameter, the first outer diameter portion (111), and the second outer diameter portion (112). The shaft-side spherical shape (113) or the shaft-side truncated cone surface portion (114) is formed, and the housing (20) has the shaft-side spherical shape (113) of the fuel passage unit (11) or the shaft-side truncated cone surface portion. The hole-side frustoconical surface portions (201, 204) which are in contact with and support (114) are formed on the inner peripheral surface.

  According to the first aspect of the present invention, the fuel injection valve is divided into the fuel passage unit (11), the coil unit (30), and the housing (20), and the fuel passage unit (11) and the housing ( 20), a conventional contact support structure between the fuel injection valve and the aligning ring is formed. As a result, the fuel passage unit (11) can be tilted in the housing (20), so that the axial displacement between the fuel supply pipe and the assembly hole can be reduced without using a separate aligning ring as in the prior art. It can be absorbed inside the injection valve.

  Further, in the invention according to claim 2, in the fuel injection valve according to claim 1, the coil unit (30) is held between the fuel passage unit (11) and the housing (20), and the fuel passage unit A gap is formed between either (11) and the coil unit (30) or between the coil unit (30) and the housing (20).

  This is because the fuel passage unit (11) and the housing (20), which are rigid bodies, do not have a clear gap between the fuel passage unit (11), the coil unit (30), and the housing (20). The resin passage of the coil unit (30) is bent between them, and the fuel passage unit (11) is inclined to absorb the axial deviation. However, according to the invention described in claim 2, stress is applied to the coil unit (30) by setting a gap on the assumption that the fuel passage unit (11) is inclined due to absorption of the axis deviation. It is possible to absorb misalignment.

  According to a third aspect of the present invention, in the fuel injection valve according to the first or second aspect, the fuel passage unit is disposed at the other axial end of the hole-side truncated cone surface portion (201, 204) of the housing (20). The magnetic member (18) which connects a magnetic circuit between (11) and a housing (20) is provided, It is characterized by the above-mentioned. According to the third aspect of the present invention, since the magnetic circuit does not break even if the fuel passage unit (11) is tilted in the housing (20), the reliable operation is maintained without affecting the operation. .

  According to a fourth aspect of the present invention, in the fuel injection valve according to the third aspect, the axial end surface (203) of the housing (20) and the contact surface (181) of the magnetic member (18) are It is characterized in that spherical surfaces of the same radius (R2) having a center on the top are brought into contact with each other. According to the fourth aspect of the present invention, even if the fuel passage unit (11) is inclined in the housing (20), it slides between the spherical surfaces (181, 203) to maintain the contact state. It is possible to prevent a gap from being generated and prevent a decrease in magnetic force.

  Further, in the invention according to claim 5, in the fuel injection valve according to claim 4, the radius (R1) of the axial spherical surface shape (113) and the radius (R2) of both spherical surfaces (181, 203) are set. It is characterized by having the same central point. According to the fifth aspect of the present invention, the center point at which the fuel passage unit (11) is inclined in the housing (20) and the center point of the spherical surface (181, 203) that slides by the inclination are the same. By using the center point, the contact state between the spherical surfaces (181, 203) can be reliably maintained.

  According to a sixth aspect of the present invention, in the fuel injection valve according to any of the third to fifth aspects, the outer diameter (D1) of the magnetic member (18) is changed to the outer diameter (D2) of the housing (20). It is characterized by being larger than. According to the sixth aspect of the present invention, even if the fuel passage unit (11) is inclined in the housing (20), the end surface (203) of the housing (20) and the contact surface (181) of the magnetic member (18). Can be kept constant without reducing the contact area.

  According to a seventh aspect of the present invention, in the fuel injection valve according to any of the third to sixth aspects, the magnetic member (18) includes the first outer diameter portion (111) of the fuel passage unit (11). It is characterized by being fixed at a predetermined position. According to the sixth aspect of the present invention, the fuel injection valve that is tilted inside to absorb the axial deviation is held in a stable state by pressing the anti-sliding surface of the magnetic member (18) with the clamp member. Can be fixed. In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a front sectional view showing an outline of the structure of the fuel injection valve 10A (10) in the first embodiment of the present invention, and FIG. 2 is an exploded structural view of the fuel injection valve 10A of FIG. FIG. 3 is a front cross-sectional view showing a state in which the fuel injection valve 10A of FIG. The fuel injection valve 10A of the present embodiment is a fuel injection valve that directly injects fuel into a combustion chamber N of a cylinder of an internal combustion engine (for example, a gasoline engine) (not shown).

  The fuel injection valve 10A is not limited to such a direct injection gasoline engine, but may be applied to a port injection gasoline engine, a diesel engine, or the like. When the fuel injection valve 10A is applied to a direct injection gasoline engine, the fuel injection valve 10A has an O-ring 5 for sealing the fuel to the fuel supply pipe 1 that supplies the fuel to the fuel injection valve 10A, as shown in FIG. And a backup ring 6 that receives the O-ring 5 and prevents the O-ring 5 from protruding.

  The fuel injection valve 10 </ b> A is assembled into the cylinder head 3 by inserting the injection-side tip of the fuel injection valve 10 </ b> A into the mounting hole 4 provided in the cylinder head 3. Thereafter, the upper surfaces of the upper housing (magnetic member) 18A (18) and the lower housing (housing) of the fuel injection valve 10A are pressed by a clamping member (not shown), thereby The injection valve 10 </ b> A is pressed and fixed downward in the mounting hole 4 of the cylinder head 3.

  As shown in FIG. 2, the fuel injection valve 10A of this embodiment is configured by sequentially inserting a coil unit 30 and a fuel passage unit 11A (11) into a lower housing 20A. The fuel passage unit 11A has a fuel passage from a fuel inlet 16 disposed at one end in the axial direction and connected to the previous fuel supply pipe 1 to an injection hole 23 disposed at the other end in the axial direction and injecting fuel. Forming. Hereinafter, in the fuel injection valve 10 </ b> A, the side on which the injection hole 23 is formed is referred to as “front end side”, and the opposite side is referred to as “base end side”.

  The cylindrical member 14 as a housing of the fuel passage unit 11A is formed in a shape having an outer diameter that becomes smaller toward the tip on the injection hole 23 side, and is largely composed of a first outer diameter portion (first outer diameter portion) 111, A second outer diameter portion (second outer diameter portion) 112 having a smaller diameter than the first outer diameter portion 111 is formed. In this embodiment, an axial spherical shape 113 having a radius R1 and having a center on the axis is formed between the first outer diameter portion 111 and the second outer diameter portion 112.

  The cylindrical member 14 is generally formed of a magnetic material, and the first outer diameter portion 111 is formed in a generally cylindrical shape in the axial direction, and the nonmagnetic cylindrical portion 13 is formed in the middle of the cylindrical shape. ing. This nonmagnetic cylinder part 13 prevents the magnetic short circuit between the magnetic cylinder parts arrange | positioned at the axial direction both sides. These cylindrical members are integrally connected by, for example, laser welding. Note that the cylindrical member 14 may be partly magnetized or non-magnetic by, for example, thermal processing after being integrally formed.

  An inlet member 15 is formed on the proximal end side of the cylindrical member 14 in the axial direction. The inlet member 15 is press-fitted on the inner peripheral side of the cylindrical member 14. A fuel inlet 16 is formed in the inlet member 15, and fuel is supplied from a fuel pump (not shown). The fuel supplied to the fuel inlet 16 flows into the cylindrical member 14 via the fuel filter 17. The fuel filter 17 removes foreign matters contained in the fuel.

  A nozzle body 21 is installed on the inner side of the distal end of the cylindrical member 14. The nozzle body 21 is formed in a cylindrical shape, and is fixed to the cylindrical member 14 by press-fitting or welding. The nozzle body 21 has a valve seat (not shown) on the inner wall surface whose inner diameter decreases as it approaches the tip. Near the tip of the nozzle body 21, an injection hole 23 that penetrates the nozzle body 21 and communicates the inner wall surface with the outer wall surface is formed.

  Inside the cylindrical member 14 is a needle (valve member referred to in the present invention) 24 for intermittently injecting fuel from the injection hole 23, and a fixed core (referred to in the present invention) for moving the needle 24 in the axial direction. A core member) 33, a movable core (core member referred to in the present invention) 40, and the like are disposed. The internal structure of the fuel passage unit 11A will be described later.

  The needle 24 is accommodated on the inner peripheral side of the cylindrical member 14 and the nozzle body 21 so as to be reciprocally movable in the axial direction. The needle 24 is disposed substantially coaxially with the nozzle body 21. The needle 24 has a shaft portion 25, a head portion 26 at an end portion on the proximal end side of the shaft portion 25, and a seal portion (not shown) on the distal end side. The seal portion can be seated on a valve seat formed on the nozzle body 21. The needle 24 forms a fuel passage through which fuel flows between the cylindrical member 14 and the nozzle body 21.

  The fuel injection valve 10 </ b> A has a coil unit 30 as a part of a drive unit that drives the needle 24. The coil unit 30 includes a coil 32 wound around a spool 31 and a connector portion 35 for supplying power to the coil 32. The spool 31 is formed of a resin in a cylindrical shape, and a coil 32 is wound on the outer peripheral side. The coil 32 is connected to the terminal 36 of the connector part 35. The coil portion of the coil unit 30 is disposed around the outer periphery of the fuel passage unit 11 </ b> A, and the lower housing 20 </ b> A is disposed around the outer periphery of the coil portion of the coil unit 30.

  The lower housing 20A is a cylindrical member made of a magnetic material, and the cylindrical portion 202 forms a part of a magnetic circuit through which a magnetic flux flows by a magnetic field generated by the coil 32. In addition, a hole-side truncated cone surface portion 201 having a mortar-like slope is formed on the inner peripheral surface on the front end side of the lower housing 20A. By contacting and supporting the hole-side truncated cone surface portion 201 and the shaft-side spherical shape 113 of the fuel passage unit 11A, the misalignment between the fuel supply pipe 1 and the mounting hole 4, which is the subject of the present invention, is absorbed. Consists of structure.

  That is, as shown in FIG. 1, the mounting hole 4 of the cylinder head 3 into which the injection-side tip of the fuel injection valve 10 </ b> A is inserted has a larger inner diameter on the insertion side of the fuel injection valve 10 </ b> A. Broadly speaking, a large-diameter first inner diameter portion 3a facing the outer diameter portion of the lower housing 20A of the fuel injection valve 10A on the insertion side of the fuel injection valve 10A, and subsequently, a second outer diameter of the fuel injection valve 10A. The small-diameter second inner diameter portion 3 b facing the portion 112 is communicated with the combustion chamber N.

  For this reason, at least between the first inner diameter portion 3a and the second inner diameter portion 3b, there is a hole-side step portion 3c facing the lower housing 20A of the fuel injection valve 10A. And between the lower housing 20A and the first inner diameter portion 3a, and between the second outer diameter portion 112 and the second inner diameter portion 3b, the injection side tip of the fuel injection valve 10A can be inserted into the mounting hole 4 of the cylinder head 3. Each has a slight clearance.

  As shown in FIG. 1, a seal ring 7 made of Teflon (registered trademark, polytetrafluoroethylene) or the like is wound around the second outer diameter portion 112 of the fuel injection valve 10A. The outer diameter portion 112 is press-fitted into the second inner diameter portion 3b of the mounting hole 4 and the seal ring 7 is compressed in the radial direction, so that the combustion gas from the combustion chamber N of the cylinder is sealed. Then, the radial positioning between the fuel injection valve 10 </ b> A and the mounting hole 4 is performed by the seal ring 7.

  In this embodiment, the fuel injection valve 10A and the mounting hole 4 are positioned in the axial direction in the lower housing 20A that is disposed on the hole-side step 3c in the mounting hole 4 and serves as a centering ring, and the fuel passage unit. 11A is formed by contact with the axial spherical surface 113 (see FIG. 3). There is an appropriate clearance S1 between the outer peripheral surface of the lower housing 20A and the inner peripheral surface of the first inner diameter portion 3a of the mounting hole 4, and the lower housing 20A can be appropriately moved in the radial direction. (See FIG. 3).

  In addition, as a feature of the present embodiment, an upper housing 18A for connecting a magnetic circuit between the fuel passage unit 11A and the lower housing 20A is provided at the base end side end portion of the lower housing 20A. The upper housing 18A is a ring member made of a magnetic material.

  The upper housing 18A is fixed to a predetermined position of the first outer diameter portion 111 of the fuel passage unit 11A by press fitting or the like (see FIG. 2). Further, there is an appropriate clearance S2 between the inner peripheral surface of the lower housing 20A and the outer peripheral surface of the upper housing 18A, and the upper housing 18A can be appropriately moved in the radial direction inside the lower housing 20A. (See FIG. 1).

  Next, the fixed core 33 and the movable core 40 are disposed inside the fuel passage unit 11 </ b> A corresponding to the coil portion of the coil unit 30 with the cylindrical member 14 interposed therebetween. The fixed core 33 is formed in a cylindrical shape from a magnetic material such as iron, and is fixed to the inner peripheral side of the cylindrical member 14 by, for example, press fitting.

  The movable core 40 is installed on the inner peripheral side of the cylindrical member 14 so as to be capable of reciprocating in the axial direction. The movable core 40 is formed in a cylindrical shape with a magnetic material such as iron, and is in contact with a spring 37 that is a first elastic member via a head portion 26 of the needle 24 at an end portion on the fixed core 33 side. One end of the spring 37 is in contact with the head portion 26 of the needle 24, and the other end is in contact with the adjusting pipe 38.

  Since the spring 37 has a force that extends in the axial direction, the movable core 40 and the needle 24 are pressed by the spring 37 in the direction of seating on the valve seat. The adjusting pipe 38 is press-fitted on the inner peripheral side of the fixed core 33. Thereby, the load of the spring 37 is adjusted by adjusting the press-fitting amount of the adjusting pipe 38. When the coil 32 is not energized, the movable core 40 and the needle 24 are pressed in the valve seat direction, and the seal portion of the needle 24 is seated on the valve seat.

  The movable core 40 has a hole penetrating in the axial direction at the center in the radial direction, and the inner diameter of the hole is formed to be slightly larger than the outer diameter of the shaft 25 of the needle 24. Has been inserted. For this reason, the needle 24 is movable in the axial direction on the inner peripheral side of the hole. In the case of this embodiment, the needle 24 slides on the inner wall of the hole of the movable core 40. Thereby, the needle 24 is guided to move in the axial direction by the movable core 40.

  The outer diameter of the head 26 of the needle 24 is larger than the inner diameter of the hole. For this reason, the head portion 26 of the needle 24 rides on the proximal end side surface of the movable core 40. Thereby, the movement of the needle 24 to the valve seat side and the relative movement of the movable core 40 to the fixed core 33 side between the movable core 40 and the needle 24 are limited. Thus, the head portion 26 of the needle 24 constitutes a stopper that restricts excessive relative movement between the movable core 40 and the needle 24.

  The movable core 40 forms a plurality of fuel passages 44 in the middle in the radial direction. Thereby, the fuel that has passed through the inner peripheral side of the fixed core 33 flows into the injection hole 23 side through the fuel passage 44 formed in the movable core 40. When the movable core 40 and the cylindrical member 14 are in contact with each other, the movable core 40 is restricted from moving in the axial direction. Further, the movable core 40 is in contact with a spring 45 as a second elastic member at the end opposite to the fixed core 33.

  The spring 45 has one end in contact with the movable core 40 and the other end in contact with the cylindrical member 14. The cylindrical member 14 has a recess for receiving the spring 45 on the side opposite to the inlet member 15, that is, on the injection hole 23 side. When the end of the spring 45 enters the recess, the inclination and bending of the spring 45 on the inner peripheral side of the cylindrical member 14 are prevented.

  If the spring 45 is tilted or bent, for example, the accuracy of the pressing force decreases. By inserting the spring 45 into the recess of the cylindrical member 14 as in this embodiment, the posture of the spring 45 is kept constant. Further, it is not necessary to install another member in order to maintain the posture of the spring 45. Therefore, the pressing force by the spring 45 can be accurately maintained without causing an increase in the number of parts and an increase in processing man-hours.

  The spring 45 has a force that extends in the axial direction. Therefore, the movable core 40 is pressed against the fixed core 33 side. A force is applied to the movable core 40 from the spring 37 via the needle 24 to the valve seat side, and a force is applied from the spring 45 to the fixed core 33 side. The pressing force of the spring 37 is larger than the pressing force of the spring 45.

  For this reason, when energization to the coil 32 is stopped, the needle 24 in contact with the spring 37 moves to the nozzle hole 23 side against the pressing force of the spring 45 together with the movable core 40 in contact with the head 26. . As a result, when energization to the coil 32 is stopped, the seal portion of the needle 24 is seated on the valve seat.

  Next, the operation of the fuel injection valve 10A with the above configuration will be described. When energization of the coil 32 is stopped, no magnetic attractive force is generated between the fixed core 33 and the movable core 40. For this reason, as described above, the needle 24 moves to the distal end side by the pressing force of the spring 37.

  Thereby, the movable core 40 is separated from the fixed core 33. That is, the movable core 40 is moved to the opposite side of the fixed core 33 together with the needle 24 by the pressing force of the spring 37. As the needle 24 moves to the side opposite to the fixed core 33, the seal portion of the needle 24 is seated on the valve seat. Therefore, the fuel is not injected from the injection hole 23.

  When the coil 32 is energized, the cylindrical portion 202 of the lower housing 20A, the distal-side magnetic portion of the cylindrical member 14, the movable core 40, the fixed core 33, and the proximal-side magnetism of the cylindrical member 14 are generated by the magnetic field generated in the coil 32. Magnetic flux flows through the part to form a magnetic circuit. Thereby, a magnetic attractive force is generated between the fixed core 33 and the movable core 40.

  When the sum of the magnetic attractive force generated between the fixed core 33 and the movable core 40 and the force of the spring 45 becomes larger than the force of the spring 37, the movable core 40 moves toward the fixed core 33. At this time, the needle 24 on which the head 26 is placed on the proximal end side surface of the movable core 40 moves together with the movable core 40 toward the fixed core 33. As a result, the seal portion of the needle 24 is separated from the valve seat.

  The fuel that has flowed into the fuel injection valve 10A from the fuel inlet 16 is the fuel filter 17, the inner peripheral side of the inlet member 15, the inner peripheral side of the adjusting pipe 38, the fuel passage 44 formed in the movable core 40, and the cylindrical member. 14 flows into the valve seat via the inner peripheral side of 14 and the inner peripheral side of the nozzle body 21. The fuel that has flowed into these fuel passages flows into the nozzle hole 23 via the space between the needle 24 and the nozzle body 21 that are separated from the valve seat. Thereby, fuel is injected from the injection hole 23.

  As described above, not only the magnetic attractive force but also the force of the spring 45 is applied to the movable core 40. For this reason, when the coil 32 is energized, the movable core 40 and the needle 24 quickly move toward the fixed core 33 due to the generated magnetic attractive force. Therefore, the operation responsiveness of the needle 24 to energization of the coil 32 can be enhanced. In addition, the electromagnetic attractive force required to drive the movable core 40 and the needle 24 is reduced. Therefore, the drive unit such as the coil 32 can be downsized.

  Next, the features and effects of this embodiment will be described. First, a fuel passage unit 11A that forms a fuel passage from a fuel inlet 16 disposed at one end in the axial direction and connected to the fuel supply pipe 1 to an injection hole 23 disposed at the other end in the axial direction and injecting fuel. A coil unit 30 disposed around the outer periphery of the fuel passage unit 11A to generate a magnetic attractive force between the core members 33 and 40 in the fuel passage unit 11A, and the outer periphery of the fuel passage unit 11A and the coil unit 30 And a lower housing 20A which forms a part of a magnetic circuit which is arranged around and flows a magnetic flux by a magnetic field generated by a coil 32.

  The fuel passage unit 11A includes a first outer diameter portion 111, a second outer diameter portion 112 that is smaller than the first outer diameter portion 111 and closer to the injection hole 23, and the first outer diameter portion 111 and the second outer diameter. Between the portion 112, an axial spherical shape 113 having a radius R1 and having a center on the axis is formed. Further, the lower housing 20A is formed with a hole-side truncated cone surface portion 201 in contact with and supporting the shaft-side spherical shape 113 of the fuel passage unit 11A on the inner peripheral surface.

  According to this, the fuel injection valve 10A is divided into the fuel passage unit 11A, the coil unit 30, and the lower housing 20A, and is adjusted with the conventional fuel injection valve between the fuel passage unit 11A and the lower housing 20A. It constitutes a contact support structure with the center ring. As a result, the fuel passage unit 11A can be tilted in the lower housing 20A, so that the axial deviation between the fuel supply pipe 1 and the mounting hole 4 can be reduced without using a separate aligning ring as in the prior art. It can be absorbed inside the injection valve 10A.

  The coil unit 30 is held between the fuel passage unit 11A and the lower housing 20A, and either / both between the fuel passage unit 11A and the coil unit 30 or between the coil unit 30 and the lower housing 20A. There is a gap in the gap.

  This is because the coil unit 30 is made of resin between the rigid fuel passage unit 11A and the lower housing 20A without setting a clear gap between the fuel passage unit 11A, the coil unit 30, and the lower housing 20A. The fuel passage unit 11A is tilted due to the bending of the spool, and the shaft misalignment can be absorbed. However, according to this, it is possible to absorb the misalignment without applying stress to the coil unit 30 by setting the gap assuming that the fuel passage unit 11A is inclined by the misalignment absorption.

  In addition, an upper housing 18A for connecting a magnetic circuit between the fuel passage unit 11A and the lower housing 20A is provided at the other axial end of the hole-side truncated cone surface portion 201 of the lower housing 20A. According to this, even if the fuel passage unit 11A is inclined in the lower housing 20A, the magnetic circuit is not interrupted, so that a reliable operation is maintained without affecting the operation.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 is a front sectional view showing an outline of the structure of the fuel injection valve 10B (10) in the second embodiment of the present invention, and FIG. 5 is an exploded structural view of the fuel injection valve 10B of FIG. FIG. 6 is a front sectional view showing a state where the fuel injection valve 10B of FIG. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described.

  In this embodiment, the end surface 203 on the base end side of the lower housing 20B (20) and the contact surface 181 of the upper housing 18B (18) are brought into contact with each other as spherical surfaces having the same center on the axis and the same radius R2. Yes. According to this, even if the fuel passage unit 11B is inclined in the lower housing 20B, the contact state is maintained by sliding between the spherical surfaces 181 and 203, so that a gap is not generated between the magnetic circuits, thereby reducing the magnetic force. Can be prevented.

  Further, the radius R1 of the axial spherical surface 113 of the fuel passage unit 11B and the radius R2 of both spherical surfaces 181 and 203 are the same center point. According to this, by setting the center point where the fuel passage unit 11B is inclined in the lower housing 20B and the center points of the spherical surfaces 181 and 203 which slide by the inclination as the same center point, the spherical surface 181, The contact state between 203 can be maintained.

  Further, the outer diameter D1 of the upper housing 18B is made larger than the outer diameter D2 of the lower housing 20B. According to this, even if the fuel passage unit 11B is inclined in the lower housing 20B, the contact area between the end surface 203 of the lower housing 20B and the contact surface 181 of the upper housing 18B can be kept constant (FIG. 6). reference).

  The upper housing 18B is fixed to a predetermined position of the first outer diameter portion 111 of the fuel passage unit 11B. According to this, the fuel injection valve 10B in a state of being inclined and absorbing the axial deviation can be held and fixed in a stable state by pressing the anti-sliding surface of the upper housing 18B with the clamp member (FIG. 6). reference).

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 7 is an enlarged partial sectional view showing an outline of the structure of the fuel injection valve 10C (10) in the third embodiment of the present invention. Features different from the above-described embodiment will be described. The fuel passage unit 11C (11) of the present embodiment includes a first outer diameter portion 111, a second outer diameter portion 112 that is smaller in diameter than the first outer diameter portion 111 and closer to the injection hole 23, and a first outer diameter portion 111. A shaft side truncated cone surface portion 114 is formed between the first outer diameter portion 112 and the second outer diameter portion 112.

  Further, in the lower housing 20C (20), a hole-side truncated cone surface portion 204 formed in a curved surface that is in contact with and supported by the shaft-side truncated cone surface portion 114 of the fuel passage unit 11C is formed on the inner peripheral surface. Even if the contact portion on the fuel passage unit 11C side is a tapered surface and the contact portion on the lower housing 20C side is a curved surface, or the curved surface and the spherical surface are in contact as in this embodiment, the first embodiment The same effect can be obtained.

It is front sectional drawing which shows the structure outline | summary of 10 A of fuel injection valves in 1st Embodiment of this invention. FIG. 2 is an exploded structural view of a fuel injection valve 10A of FIG. It is front sectional drawing which shows the state in which the fuel injection valve 10A of FIG. It is front sectional drawing which shows the structure outline | summary of the fuel injection valve 10B in 2nd Embodiment of this invention. FIG. 5 is an exploded structural view of the fuel injection valve 10B of FIG. It is front sectional drawing which shows the state in which the fuel injection valve 10B of FIG. 4 was attached inclining. FIG. 10 is an enlarged partial cross-sectional view showing a structural outline of a fuel injection valve 10C according to a third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel supply pipe 10 ... Fuel injection valve 11 ... Fuel passage unit 16 ... Fuel inlet 18 ... Upper housing (magnetic member)
20 ... Lower housing (housing)
23 ... Injection hole 24 ... Needle (valve member)
30 ... Coil unit 32 ... Coil 33 ... Fixed core (core member)
35 ... Connector part 40 ... Movable core (core member)
111 ... 1st outer diameter part (1st outer diameter part)
112 ... 2nd outer diameter part (2nd outer diameter part)
113: Shaft side spherical shape 114 ... Shaft side truncated cone surface portion 181 ... Contact surface, spherical surface 201 ... Hole side truncated cone surface portion 204 ... Hole side truncated cone surface portion 203 ... End surface, spherical surface D1 ... Outer diameter of upper housing (magnetic member) D2 ... Outer diameter of lower housing (housing) N ... Combustion chamber R1 ... Radius of shaft side spherical shape R2 ... Radius of spherical surfaces 181 and 203

Claims (7)

  1. In a fuel injection valve for injecting fuel supplied from a fuel supply pipe (1) into an internal combustion engine,
    A fuel passage from a fuel inlet (16) disposed at one end in the axial direction and connected to the fuel supply pipe (1) to a nozzle hole (23) disposed at the other end in the axial direction and for injecting fuel A valve member (24) that is formed to intermittently inject fuel from the nozzle hole (23) and a core member (33, 40) for moving the valve member (24) in the axial direction are accommodated. A fuel passage unit (11),
    A coil (32) disposed around an outer periphery of the fuel passage unit (11) for generating a magnetic attractive force between the core members (33, 40) in the fuel passage unit (11); 32) a coil unit (30) provided with a connector part (35) for supplying electric power;
    A housing (20) that is arranged around the outer periphery of the fuel passage unit (11) and the coil unit (30) and forms a part of a magnetic circuit through which a magnetic flux flows by a magnetic field generated by the coil (32);
    The fuel passage unit (11) is formed in such a shape that the outer diameter becomes smaller toward the tip on the nozzle hole (23) side, and the first outer diameter portion (111) and the first outer diameter portion ( 111) between the second outer diameter portion (112) having a smaller outer diameter and the first outer diameter portion (111) and the second outer diameter portion (112). A shaft side spherical shape (113) having a radius (R1) or a shaft side truncated cone surface part (114) is formed,
    The housing (20) is configured to contact and support the shaft-side spherical surface shape (113) or the shaft-side truncated cone surface portion (114) of the fuel passage unit (11). Is formed on the inner peripheral surface.
  2.   The coil unit (30) is held between the fuel passage unit (11) and the housing (20), and between the fuel passage unit (11) and the coil unit (30) or the coil unit. The fuel injection valve according to claim 1, wherein a gap is formed in either / both between (30) and said housing (20).
  3.   Magnetism for communicating the magnetic circuit between the fuel passage unit (11) and the housing (20) to the other axial end of the hole-side truncated cone surface portion (201, 204) of the housing (20). The fuel injection valve according to claim 1 or 2, further comprising a member (18).
  4.   The axial end surface (203) of the housing (20) and the contact surface (181) of the magnetic member (18) are brought into contact with each other with spherical surfaces having the same radius (R2) centered on the axis. The fuel injection valve according to claim 3.
  5.   The fuel according to claim 4, wherein the radius (R1) of the axial spherical surface shape (113) and the radius (R2) of the spherical surfaces (181, 203) are the same center point. Injection valve.
  6.   The fuel injection valve according to any one of claims 3 to 5, wherein an outer diameter (D1) of the magnetic member (18) is larger than an outer diameter (D2) of the housing (20). .
  7.   The said magnetic member (18) is being fixed to the predetermined position of the said 1st outer diameter part (111) of the said fuel passage unit (11), The Claim 1 thru | or 6 characterized by the above-mentioned. Fuel injection valve.
JP2008328425A 2008-12-24 2008-12-24 Fuel injection valve Active JP4985636B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015232334A (en) * 2015-09-28 2015-12-24 株式会社デンソー Fuel injection valve
JPWO2013183306A1 (en) * 2012-06-08 2016-01-28 本田技研工業株式会社 Fuel injection device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63158582U (en) * 1987-04-06 1988-10-18
JPH11132127A (en) * 1996-11-13 1999-05-18 Denso Corp Fuel injection valve and assembling method thereof
JP2006022654A (en) * 2004-07-06 2006-01-26 Mitsubishi Electric Corp Assembly structure for fuel injection valve
JP2006132437A (en) * 2004-11-05 2006-05-25 Nissan Motor Co Ltd Mounting structure for fuel injection valve
JP2007016774A (en) * 2005-06-07 2007-01-25 Denso Corp Fuel injection valve and its manufacturing method
JP2008297966A (en) * 2007-05-31 2008-12-11 Hitachi Ltd Fuel injection valve and method for adjusting stroke thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63158582U (en) * 1987-04-06 1988-10-18
JPH11132127A (en) * 1996-11-13 1999-05-18 Denso Corp Fuel injection valve and assembling method thereof
JP2006022654A (en) * 2004-07-06 2006-01-26 Mitsubishi Electric Corp Assembly structure for fuel injection valve
JP2006132437A (en) * 2004-11-05 2006-05-25 Nissan Motor Co Ltd Mounting structure for fuel injection valve
JP2007016774A (en) * 2005-06-07 2007-01-25 Denso Corp Fuel injection valve and its manufacturing method
JP2008297966A (en) * 2007-05-31 2008-12-11 Hitachi Ltd Fuel injection valve and method for adjusting stroke thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013183306A1 (en) * 2012-06-08 2016-01-28 本田技研工業株式会社 Fuel injection device
JP2015232334A (en) * 2015-09-28 2015-12-24 株式会社デンソー Fuel injection valve

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