JP2006132437A - Mounting structure for fuel injection valve - Google Patents

Mounting structure for fuel injection valve Download PDF

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Publication number
JP2006132437A
JP2006132437A JP2004322104A JP2004322104A JP2006132437A JP 2006132437 A JP2006132437 A JP 2006132437A JP 2004322104 A JP2004322104 A JP 2004322104A JP 2004322104 A JP2004322104 A JP 2004322104A JP 2006132437 A JP2006132437 A JP 2006132437A
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Japan
Prior art keywords
injection valve
fuel injection
fuel
portion
provided
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Pending
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JP2004322104A
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Japanese (ja)
Inventor
Hiroshi Azuma
裕志 東
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Nissan Motor Co Ltd
日産自動車株式会社
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Application filed by Nissan Motor Co Ltd, 日産自動車株式会社 filed Critical Nissan Motor Co Ltd
Priority to JP2004322104A priority Critical patent/JP2006132437A/en
Publication of JP2006132437A publication Critical patent/JP2006132437A/en
Pending legal-status Critical Current

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Abstract

An injector cup provided in a fuel supply pipe and after a fuel injection valve in a state in which the fuel injection valve is inserted into a receiving hole provided in a cylinder head or an intake passage from the front end side and pressed by a fuel supply pipe from the rear end side. Suppresses eccentricity with the end.
SOLUTION: A fuel injection valve 1 having a stepped cylindrical portion whose diameter decreases toward the tip end in the axial direction, an accommodation hole 18 provided in a cylinder head 5 or an intake passage 7 of an internal combustion engine, and a stepped cylindrical portion. A ring member 20 seated coaxially with the fuel injection valve 1 on the wall surface of the accommodation hole 18 facing the shoulder portion 23 that connects the small diameter portion and the large diameter portion. The fuel injection valve 1 comes into contact with a curved surface 26 having an arcuate cross section that extends in a tapered shape toward the rear end side in the axial direction of the fuel injection valve 1 provided on the circumferential side.
[Selection] Figure 2

Description

  The present invention relates to a ring interposed between a fuel injection valve and a housing hole wall surface when the fuel injection valve is inserted into a housing hole provided in a cylinder head.

  A fuel injection valve of an internal combustion engine usually has a front end portion provided with an injection hole inserted into an injector cup provided in an intake manifold or a cylinder head, and a rear end portion provided with a fuel introduction hole is a housing hole provided in a pipe for fuel supply Connected to insert. A seal member is provided between the fuel injection valve, the accommodation hole, and the injector cup.

  The fuel supply pipe is fixed to the intake manifold or the cylinder head with the fuel injection valve pressed in the axial direction.

  In the configuration as described above, if there are variations in the dimensions of the accommodation hole, the injector cup, and the fuel injection valve, the fuel injection valve and the accommodation hole or the injector cup are in an eccentric state. In order to ensure a reliable fuel seal performance even in a state where eccentricity has occurred, it is necessary to keep the compression rate within a specified value, for example, 8 to 30%, over the entire circumference of the seal member. It is necessary to increase the linearity, leading to cost increase and workability deterioration. Further, in order to reduce the eccentricity, it is necessary to improve the processing accuracy of each part, leading to an increase in cost.

As a method for solving these problems, Patent Document 1 discloses that a sleeve that elastically contacts both the fuel injection valve and the accommodation hole is inserted between the accommodation hole and the fuel injection valve, and the fuel is injected by the elasticity of the sleeve. A technical means for suppressing eccentricity by centering the valve rear end portion in the accommodation hole is disclosed.
Special publication 2001-508520 table)

  However, the sleeve described in the cited document 1 has a shape in close contact with the conical section tapered toward the tip end side of the fuel injection valve and the housing hole wall surface facing this section. Although centered so that the axis of the injection valve coincides with the axis of the receiving hole, the eccentricity between the injector cup provided in the fuel supply pipe and the rear end of the fuel injection valve cannot be suppressed. For this reason, for example, when the pressure in the fuel supply pipe becomes high as in the case of directly injecting fuel into the combustion chamber, as described above, in order to ensure the sealing performance between the rear end of the fuel injection valve and the injector cup. Measures such as increasing the alignment of the seal member are required.

  Therefore, an object of the present invention is to suppress the eccentricity between the injector cup and the fuel injection valve rear end.

  A fuel injection valve mounting structure according to the present invention includes a fuel injection valve having a stepped cylindrical portion whose diameter decreases toward the tip end in the axial direction, a housing hole provided in a cylinder head or an intake passage of an internal combustion engine, and the stepped portion. A ring member seated coaxially with the fuel injection valve on the wall surface of the receiving hole facing the shoulder connecting the small diameter portion and the large diameter portion of the cylindrical portion, and the ring member on the inner peripheral side The provided fuel injector is in contact with the fuel injector at a curved surface portion having an arcuate cross section that extends in a tapered shape toward the rear end side in the axial direction of the fuel injector.

  According to the present invention, since the contact surface between the fuel injection valve and the ring is a curved surface portion having an arcuate cross section, the fuel injection valve can be inclined with respect to the accommodation hole. Therefore, for example, when the rear end side of the fuel injection valve is connected to an injector cup provided in the fuel supply pipe, even if an eccentricity occurs between the accommodation hole and the injector cup, it is used for sealing the injector cup and the fuel injection valve. The fuel injection valve is tilted by the self-centering function by the elastic force of the O-ring fitted in the vicinity of the rear end of the fuel injection valve, whereby the rear end of the fuel injection valve is located at the center of the connection portion with the injector cup, The eccentricity between the fuel injection valve rear end and the injector cup can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an engine to which the first embodiment is applied.

  5 is a cylinder head, 15 is a cylinder block.

  The cylinder block 15 is provided with a cylinder 15a, in which the piston 12 is slidably housed. A combustion chamber 13 is defined by the lower surface of the cylinder head 5, the top surface of the piston 12, and the wall surface of the cylinder 15a.

  The cylinder head 5 is provided with an intake port 7 and an exhaust port 8. The intake port 7 communicates one side surface (not shown) of the cylinder head 5 and the combustion chamber 13, and the exhaust port 8 is connected to the other side surface (not shown) and the combustion chamber. 13 to communicate with each other.

  An intake valve 9 and an exhaust valve 10 are provided in the openings 7a and 8a on the combustion chamber 13 side of the intake port 7 and the exhaust port 8, respectively. The intake valve 9 and the exhaust valve 10 are driven by a camshaft (not shown), and open and close the intake port 7 and the exhaust port 8 in response to the vertical movement of the piston 12.

  An ignition plug 11 for spark ignition of the air-fuel mixture in the combustion chamber 13 is provided in the approximate center of the ceiling surface of the combustion chamber 13.

  A housing hole 18 is provided below the intake port 7 so as to communicate with the combustion chamber 13, and the fuel injection valve 1 is inserted from the front end side. The fuel injection valve 1 is a so-called top feed type having one or a plurality of injection holes 1a at the front end and a fuel introduction hole 1b at the rear end. The injection hole 1a is a spark plug 11 from the lower side of the intake port opening 7a. Inject fuel toward The fuel introduction hole 1b is connected to a fuel tube 3 for distributing the fuel sucked up by a fuel pump from a fuel tank (not shown) to the fuel injection valves of the respective cylinders.

  Since the fuel is injected toward the vicinity of the spark plug 11, the air-fuel ratio around the spark plug 11 can be made an air-fuel ratio suitable for combustion near the stoichiometric air-fuel ratio even with a small fuel injection amount. Combustion operation can be performed.

  The fuel tube 3 is fastened to the cylinder head 5 by a bolt 4 and presses the fuel injection valve 1 as a pressing member against the cylinder head 5 via a holder 6 as a cylindrical member described later.

  In the engine configured as described above, when the piston 12 descends, the intake valve 9 opens to introduce intake air into the combustion chamber 13 (intake stroke), and the intake valve 9 closes and the piston 12 rises to compress the intake air (compression). (Stroke), fuel is injected from the fuel injection valve 1 during compression to form an air-fuel mixture in the vicinity of the spark plug 11, and this air-fuel mixture is burned by spark ignition with the spark plug 11 to push down the piston 12 (explosion stroke). ) When the piston 12 is raised again, the exhaust valve 10 is opened, and the exhaust gas after combustion is discharged from the exhaust port 8 (exhaust stroke).

  In this embodiment, the fuel injection valve 1 is provided on the lower side of the intake port 7. However, the fuel injection valve 1 is provided on the upper side of the intake port 7, that is, near the spark plug 11 on the ceiling surface of the combustion chamber 13. You may perform injection.

  Next, the shapes of the fuel injection valve 1 and the accommodation hole 18 will be described with reference to FIG. 2 which is an enlarged view of the vicinity of the fuel injection valve 1 mounting portion.

  The fuel injection valve 1 has a stepped columnar shape, and has a conical stepped portion 23 that tapers toward the distal end side at a portion inserted into the accommodation hole 18. The stepped portion 23 is seated on a damping ring 20 described later, and axial positioning is performed.

  The fuel injection valve 1 is inserted into the accommodation hole 18 from the front end side, and the sealing performance is secured by the seal member 27.

  The rear end side of the fuel injection valve 1 is inserted into an injector cup 22 provided in the fuel tube 3, and a sealing property between the inner wall surface of the injector cup 22 is secured by an O-ring 21. The injector cup 22 is provided so that the axis coincides with the axis of the accommodation hole 18 in a state where the fuel tube 3 is fixed to the cylinder head 5.

  A connector 2 for electrical connection with a control unit (not shown) is provided on the side surface of the substantially cylindrical portion 21 so as to protrude in the radial direction.

  The accommodation hole 18 has a shape along the shape of the fuel injection valve 1 except for a portion facing the step portion 23. A portion facing the step portion 23 is a plane 24 that is substantially orthogonal to the axis of the accommodation hole 18. A vibration damping ring 20 to be described later is seated on the flat surface 24 so that the stepped portion 23 and the vibration damping ring 20 come into contact with each other.

  The damping ring 20 is formed of, for example, a Mn—Cu steel-based damping alloy. Thereby, it is possible to prevent the generation of noise caused by the impact energy generated when the needle valve (not shown) that opens and closes the injection hole 1 a being seated is transmitted to the cylinder head 5.

  Here, the shape of the damping ring 20 will be described with reference to FIG. 3 which is a sectional view of the damping ring 20.

  As shown in the figure, the lower surface 25 in contact with the flat surface 24 is a flat surface and is in close contact with the flat surface 24 of the receiving hole 18. As described above, the plane 24 on which the lower surface 25 of the damping ring 20 is seated is a plane that is substantially orthogonal to the axial direction. Therefore, the axial position of the fuel injection valve 1 is determined by the depth of the plane 24 from the surface of the cylinder head 5. It depends on the thickness of the damping ring 20. Therefore, the axial position of the fuel injection valve 1 can be directly managed by managing the depth from the surface of the cylinder head 5 and the thickness of the damping ring 20.

  At least a part on the upper side of the inner wall surface of the damping ring 20 is a curved surface 26 having an arcuate cross section in which the inner diameter expands in a tapered shape as it approaches the upper surface 28, and the curved surface 26 and the stepped portion 23 come into contact with each other. That is, since the curved surface is in contact with the flat surface, the fuel injection valve 1 can be tilted with respect to the damping ring 20 while the stepped portion 23 and the curved surface 26 are in contact with each other over the entire circumference.

  Thereby, for example, as shown in FIG. 4, even when the accommodation hole 18 and the injector cup 22 are decentered due to processing variations or the like, the rear end portion is formed by the self-centering function by the elastic force of the O-ring 21. 1b comes to be located in the approximate center of the injector cup 22, and the collapse of the O-ring 21 becomes uniform.

  Therefore, it is not necessary to increase the linearity of the O-ring 21 in order to obtain a specified compression rate, and the pressure resistance of the seal portion can be increased.

  Further, even when the flat surface 24 is inclined and processed so as not to be orthogonal to the axis of the accommodation hole 18, the vibration damping ring 20 and the fuel injection valve 1 can contact over the entire circumference. Therefore, the fuel injection valve 1 can be seated stably on the damping ring 20. That is, when processing the flat surface 24, it is not necessary to request high processing accuracy.

  On the other hand, FIG. 5 shows a case where eccentricity is absorbed (alignment) by a conventional structure, for example, the method described in Patent Document 1. In FIG. 5, the alignment sleeve is omitted.

  The contact surface of the sleeve with the fuel injection valve 1 has a shape that follows the shape of the fuel injection valve as shown in FIG. For this reason, the fuel injection valve 1 cannot be tilted with respect to the axis of the accommodation hole 18, and the fuel injection valve 1 and the accommodation hole 18 are aligned so that their axes coincide with each other.

  For this reason, when the position of the injector cup 22 is shifted as shown in FIG. 5, the eccentricity between the fuel injection valve 1 and the injector cup 22 is not eliminated, and the rear end 1b is the center of the injection cup 22. Never be located in. Therefore, the O-ring 21 is not uniformly crushed, and in order to ensure sealing performance, the compression rate is kept within a specified value by increasing the linearity of the O-ring 21 or the like, and the processing accuracy is increased to prevent the occurrence of eccentricity. The cost increases because measures such as to do so must be taken.

  As described above, the processing accuracy of the flat surface 24 of the housing hole 18 and the lower surface 25 of the damping ring 20 is poor, and the damping hole 20 and the damping ring 20 are inserted into the housing hole 18 in a state where the damping ring 20 is inserted. Even when eccentricity occurs, the eccentricity can be absorbed by the inclination of the fuel injection valve 1.

  As described above, since the eccentricity can be absorbed by the inclination of the fuel injection valve 1, if the accuracy of the damping ring 20 is managed, there is no need to increase the machining accuracy of other parts, and the machining cost is correspondingly increased. The increase can be suppressed.

  Since the plane 24 on which the damping ring 20 is seated is a plane that is substantially orthogonal to the accommodation hole 18, the machining amount and the measurement amount are reduced as compared to machining the shape following the fuel injection valve 1. Cost increase can be suppressed.

  Since the damping ring 20 is formed of a damping alloy, it is possible to absorb the impact energy when the needle valve of the fuel injection valve 7 is seated, thereby generating abnormal noise due to the transmission of the impact energy. Can be prevented.

  In the present embodiment, the case of applying to a so-called in-cylinder direct injection engine in which fuel is directly injected into the combustion chamber has been described. However, fuel is injected into an intake passage (not shown) connected to the intake port 7. It is also possible to apply to a so-called in-port injection engine.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the scope of the technical idea described in the claims.

  The present invention relates to a structure of a fuel injection valve mounting portion of an internal combustion engine.

It is the schematic of the internal combustion engine to which this embodiment is applied. It is an enlarged view of a fuel injection valve attachment part. It is sectional drawing of a damping ring. It is a figure for demonstrating the alignment function of this embodiment. It is a figure for demonstrating the conventional alignment function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel injection valve 2 Connector 3 Fuel tube 4 Bolt 5 Cylinder head 6 Holder 7 Intake port 8 Exhaust port 9 Intake valve 10 Exhaust valve 11 Spark plug 12 Piston 13 Combustion chamber 18 Accommodating hole 20 Damping ring 21 O-ring 22 Injector cup 23 Stepped portion 26 Curved surface 27 Seal member

Claims (3)

  1. A fuel injection valve having a stepped cylindrical portion with a diameter that decreases toward the tip end in the axial direction;
    A receiving hole provided in a cylinder head or an intake passage of the internal combustion engine;
    A ring member seated coaxially with the fuel injection valve on the housing hole wall surface facing the shoulder connecting the small diameter portion and the large diameter portion of the stepped cylinder portion;
    The fuel injection valve mounting structure, wherein the ring member is in contact with the fuel injection valve at a curved surface portion having an arcuate cross section that extends in a tapered shape toward the rear end side in the axial direction of the fuel injection valve provided on the inner peripheral side. .
  2.   The fuel injection valve mounting structure according to claim 1, wherein the seating surface of the ring member is a plane that is substantially orthogonal to the axis of the accommodation hole.
  3.   The fuel injection valve mounting structure according to claim 1 or 2, wherein the ring member is formed of a damping alloy.
JP2004322104A 2004-11-05 2004-11-05 Mounting structure for fuel injection valve Pending JP2006132437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004322104A JP2006132437A (en) 2004-11-05 2004-11-05 Mounting structure for fuel injection valve

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Application Number Priority Date Filing Date Title
JP2004322104A JP2006132437A (en) 2004-11-05 2004-11-05 Mounting structure for fuel injection valve

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010138809A (en) * 2008-12-11 2010-06-24 Denso Corp Fuel injection valve installation structure
JP2010138810A (en) * 2008-12-11 2010-06-24 Denso Corp Fuel injection valve installation structure
JP2010150976A (en) * 2008-12-24 2010-07-08 Denso Corp Fuel injection valve
JP2010185323A (en) * 2009-02-11 2010-08-26 Denso Corp Mounting structure for fuel injection valve and washer of fuel injection valve used therefor
JP2011157939A (en) * 2010-02-03 2011-08-18 Denso Corp Mounting structure of fuel injection valve
JP2016503143A (en) * 2013-01-22 2016-02-01 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Fuel injection device having fuel guiding component, fuel injection valve, and connecting member

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010138809A (en) * 2008-12-11 2010-06-24 Denso Corp Fuel injection valve installation structure
JP2010138810A (en) * 2008-12-11 2010-06-24 Denso Corp Fuel injection valve installation structure
JP2010150976A (en) * 2008-12-24 2010-07-08 Denso Corp Fuel injection valve
JP2010185323A (en) * 2009-02-11 2010-08-26 Denso Corp Mounting structure for fuel injection valve and washer of fuel injection valve used therefor
JP2011157939A (en) * 2010-02-03 2011-08-18 Denso Corp Mounting structure of fuel injection valve
JP2016503143A (en) * 2013-01-22 2016-02-01 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Fuel injection device having fuel guiding component, fuel injection valve, and connecting member

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