JP2010281296A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injector which is attached so that metal parts of a fuel injection valve do not directly contact with a cylinder head, prevents an operation sound of the fuel injection valve from being transmitted to the cylinder head, and is suppressed in the operation sound, in the fuel injection valve used for a cylinder direct injection type internal combustion engine. <P>SOLUTION: A vibration absorbing member 107 for blocking the propagation of a sound of the fuel injection valve is formed integrally with the fuel injection valve so that, when attaching the fuel injection valve for directly injecting fuel into a cylinder of the internal combustion engine to the cylinder head 101, the metal parts of the fuel injection valve do not directly contact with the cylinder head 101 and the operation sound of the fuel injection valve does not propagate to the cylinder head 101. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel injection valve used in an internal combustion engine, and more particularly to a fuel injection valve that needs to be connected to a cylinder head in order to inject fuel directly into a cylinder.

  In Japanese Patent Application Laid-Open No. 62-195542, in a multi-port type fuel injection valve that is used at a low pressure of 400 kPa or less and injects fuel into a port, rubber is used to prevent radiation of operating noise generated from the fuel injection valve. A method of covering with a soundproof cover made of metal is disclosed.

  Japanese Patent Laid-Open No. 2001-271723 discloses a method of preventing sound emission by covering a power supply terminal (plug) protruding laterally from a fuel injection valve and a coupler coupled to the plug with a soundproof cover. ing.

Japanese Patent Laid-Open No. Sho 62-195542 JP 2001-271723 A

  In the direct injection type fuel injection valve, the fuel injection valve is inserted into a mounting hole provided in the cylinder head, and the fuel injection valve and the components provided in the internal combustion engine, in particular, the cylinder head are compared directly or with metal. It is attached in contact through a member having a large elastic modulus. The fuel injection valve is connected to the fuel pipe. In addition, the fuel injection valve is connected so as to be pressed against the cylinder head via an elastic member provided therebetween. Further, in the engine operating state, the fuel injection valve is driven in a state where the fuel injection valve is pressed against the cylinder head by the fuel pressure.

  When the fuel injection valve is driven, a sound is generated corresponding to opening and closing of the valve. The generated sound causes the fuel injection valve body to vibrate in the valve body movement axis direction of the fuel injection valve. As described above, the fuel injection valve receives a force in the valve body movement axis direction and is pressed against the cylinder head. The parts forming the cylinder head and the fuel injection valve are both metal, and the sound speed is relatively close. That is, sound waves are easy to propagate. For this reason, the sound generated from the fuel injection valve easily propagates to the cylinder head. The same phenomenon is the same when the fuel injection valve and the fuel pipe contact. Here, it demonstrates centering on the subject of a contact with a cylinder head. The sound propagated to the cylinder head vibrates the cylinder head and the equipment attached thereto, resulting in engine noise. For this reason, it is desirable that the fuel injection valve and the cylinder head are attached in a state where substances having different sound velocities, such as remarkably different elastic coefficients, are used.

  As a measure against sound insulation, the fuel injection valve is generally covered with a sound insulation material such as foam rubber or foam resin. In addition to the high cost of the sound insulation material itself, a separate sound insulation material is used as the fuel. By requiring a stroke to be mounted on the injection valve, the cost is further increased.

  The present invention has been made paying attention to such a conventional problem, and an object of the present invention is to provide a fuel injection valve capable of reducing operating noise when the valve is opened and closed at low cost.

  Therefore, in the present invention, the vibration absorbing member made of resin or soft resin is sandwiched between the fuel injection valve and the cylinder head (a part provided in the internal combustion engine) so as not to be in direct contact. Further, the vibration absorbing member is configured as a part of the casing of the fuel injection valve.

  In this way, a high-cost foamed rubber member is not used, and the amount of resin used is small compared to the case where the entire fuel injection valve is covered. Moreover, the process of attaching another member after attaching the fuel injection valve to the cylinder head can be omitted. Accordingly, it is possible to easily prevent the propagation of the operation sound of the fuel injection valve at a low cost.

It is sectional drawing which shows the whole fuel-injection valve based on 1st Example of this invention. It is a figure which shows the assembly state of the fuel injection valve which concerns on this invention. It is a perspective view which shows the structure of the fuel injection valve which concerns on the 2nd Example which concerns on this invention. It is a perspective view which shows the structure of the fuel injection valve which concerns on 3rd Example based on this invention. It is a perspective view which shows the structure of the fuel injection valve which concerns on the 4th Example which concerns on this invention.

  Examples according to the present invention will be described below.

  FIG. 1 is a sectional view of a fuel injection valve according to the present invention. FIG. 2 is a view showing a state in which the fuel injection valve is inserted into the cylinder head 101 and is pressed against the cylinder head by the fuel pipe 103 via the fixing ring 102 and the fuel injection valve is fixed.

  When the fuel pressure is supplied from the fuel pipe 103, the O-ring 104 receives a force in a direction in which the O-ring 104 is pressed against the cylinder head 101 via the backup ring 105 by the fuel pressure inside the fuel pipe 103 of the fuel injection valve. Further, since the pressure due to combustion in the combustion chamber gives a force in a direction to push the fuel injection valve upward from the lower side of the cylinder head 101, the fixing ring is used to prevent the fuel injection valve from coming off the cylinder head 101. The fuel pipe 103 is fixed to the cylinder head 101 through 102. The fuel injection valve is firmly fixed in contact with the cylinder head 101 via the vibration absorbing member 107 attached to the housing 106 by the force pressed against the cylinder head 101.

  By adopting such a method of fixing to the cylinder head 101 via the vibration absorbing member 107, the fuel injection valve can be mounted without the fuel injection housing 106 directly contacting the cylinder head 101.

  Here, the vibration absorbing member 107 is made of the same material as the hard resin material forming the connector 118 for energizing the coil 115. Alternatively, a soft resin material including a rubber material may be used.

  The vibration absorbing member 107 is fixed to the housing 106 by adhesion or press fitting, and is formed so as not to drop off when the fuel injection valve is fixed to the cylinder head 101.

  The fuel injection valve is a device that starts and stops fuel injection by opening and closing the valve body 110. The valve body 110 slides while being guided by a rod guide 112 provided on the upstream side and a valve body guide 113 provided on the downstream side. These guide members are fixed to the nozzle holder 114.

  A driving force for opening the valve body 110 is transmitted via the contact portion 200 between the anchor 108 and the valve body 110 by a magnetic attraction force generated between the anchor 108 and the core 109 by energizing the coil 115. . The driving force for closing the valve body 110 is a force by the spring 117 biased in the compression direction by the adjuster 116. For this reason, when energization of the coil 115 is stopped, the valve body 110 moves in the valve closing direction by the urging force of the spring 117, and comes into contact with the valve seat provided on the orifice plate 111 to close the valve.

  In this way, when the fuel injection valve is opened, the anchor 108 and the valve body 110 collide with the abutting contact portion 200 of the core 109 to generate a collision sound. Further, when the valve is closed, the valve body 110 collides with the abutting contact portion 201 of the orifice plate 111 to generate a collision sound.

  As a result, it is possible to prevent the hammering sound of the anchor 108 and the core 109 and the collision sound between the valve body 110 and the orifice plate 111 that are generated when the fuel injection valve is operated from being directly transmitted to the cylinder head 101. In general, it is easy to propagate sound from a rigid (ie fast sound) object to a soft (ie slow sound) object, but it is difficult to propagate sound from a soft object to a rigid object. It is possible to prevent the operation sound of the fuel injection valve from propagating to the cylinder head 101.

  FIG. 3 shows a second embodiment.

  The coil 115 is molded with a hard resin on the outer periphery after the bobbin has been laid, but in this embodiment, the vibration absorbing member 107 of the first embodiment is integrated so as to cover the housing 106 of the fuel injection valve at this time. Mold. Further, instead of the hard resin mold 107, it may be molded with a soft resin including a rubber material.

  In this way, it is not necessary to attach the vibration absorbing member 107 without assembling in a separate process, so that the number of processes can be reduced and the cost can be further reduced.

  FIG. 4 shows a third embodiment.

  In the present embodiment, the coil 115 is molded integrally with the vibration absorbing member 107 according to the first embodiment after the bobbin is subjected to the winding and then molded with a hard resin. Further, instead of the hard resin mold 107, it may be molded with a soft resin including a rubber material. The vibration absorbing member 107 is molded so as to enter the notch 202 provided in the housing 106 and not fall off due to the anchor effect.

  In this way, it is not necessary to attach the vibration absorbing member 107 without assembling in a separate process, so that the number of processes can be reduced and the cost can be further reduced.

  FIG. 5 shows a fourth embodiment.

  The coil 115 is molded with a hard resin after the bobbin is plated, but in this embodiment, the outer periphery of the housing 106, the nozzle holder 114, and the core 109 is prevented so that the metal part is not exposed to the outer periphery of the fuel injection valve. The vibration absorbing member 107 of the first embodiment is integrally formed so as to cover the part. Further, instead of the hard resin mold 107, it may be molded with a soft resin including a rubber material.

  In this way, it is not necessary to attach the vibration absorbing member 107 without assembling in a separate process, so that the number of processes can be reduced and the cost can be further reduced.

101 Cylinder head 102 Fixed ring 103 Fuel pipe 104 O-ring 105 Backup ring 106 Housing 107 Vibration absorbing member 108 Anchor 109 Core 110 Valve body 111 Orifice plate 112 Rod guide 113 Valve body guide 114 Nozzle holder 115 Coil 116 Adjuster 117 Spring 118 Connector 200 201 Contact portion 202 Notch

Claims (5)

In a fuel injection valve that directly injects fuel into a cylinder of an internal combustion engine,
A fuel injection device characterized in that a vibration absorbing member that prevents propagation of sound from the fuel injection valve is formed integrally with the fuel injection valve so that a metal portion of the fuel injection valve does not directly contact a component provided in the internal combustion engine. valve.   2. The fuel injection valve according to claim 1, wherein the vibration absorbing member is made of a soft resin including a resin or a rubber material.   3. The fuel injection valve according to claim 1, wherein the vibration absorbing member is the same as a resin molding member of the fuel injection valve and is integrally molded.   3. The fuel injection valve according to claim 1, wherein the vibration absorbing member is press-fitted and fixed to the fuel injection valve so as to be integrated.   3. The fuel injection valve according to claim 1, wherein the vibration absorbing member is formed by double molding so as to cover the fuel injection valve.

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