JP2010229890A - Attachment device for ignition coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange a plurality of ignition coils near a cylinder head efficiently in a concentrated manner, sufficiently secure electrical insulation properties and stiffness for supporting a load, and facilitate attachment and detachment of wiring efficiently in an electronic distribution type ignition system for an internal combustion engine. <P>SOLUTION: An attachment device for the ignition coils includes a resin bracket assembling a plurality of ignition coils 20 into one module, and a steal plate bracket 26 forming an attachment surface of the resin bracket. The resin bracket is formed with a shelf-shaped part 25a and a base plate part 25b fastened on an attachment surface formed by the steel plate bracket. The ignition coils 20 are each incorporated such that a lower surface of the shelf-shaped part 25a is used as an attachment surface, a secondary side high voltage terminal is exposed toward an upper part of the shelf-shaped part 25a, and an insertion port of a primary side connector 23 is projected at a lower part of the shelf-shaped part 25a toward the outside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ignition coil mounting device capable of efficiently and intensively arranging a plurality of ignition coils on a cylinder head in an electronic distribution ignition system for an internal combustion engine.

  In an electronic power distribution ignition system for an internal combustion engine, an ignition coil that includes an ignition control circuit including an ignition coil and a power transistor together with an ignition coil is used as an ignition coil corresponding to each cylinder.

  Each ignition coil has a secondary high voltage terminal connected to the ignition plug of the corresponding cylinder via a high tension cord, and an ignition signal and power are input to the primary connector via a harness. In each ignition coil, the igniter controls ON / OFF of the power transistor based on the ignition signal. When the power transistor is turned on, a current (power source) is conducted to the primary coil of the ignition coil, and when the power transistor is turned off, a high voltage is generated in the secondary coil of the ignition coil to ignite the spark plug (spark). Discharge).

  Patent Document 1 relates to an ignition system that includes an ignition coil and a CDI (Capacitive Discharge Ignition) unit separately. However, as an ignition coil support device, an electrical box that houses electrical components such as a CDI unit is used as an engine. And the ignition coil is housed in a rubber part and supported by an electrical box.

Japanese Patent Laid-Open No. 07-158546

  By the way, an ignition coil that incorporates an ignition control circuit including an igniter and a power transistor together with the ignition coil has a large weight per one, and when it is collected by the number of cylinders, the weight increases and the weight increases. When assembled into a module, considerable rigidity is required to support these loads. In order to shorten the high tension cord, it is desirable to install such an ignition coil in the vicinity of the cylinder head. However, around the cylinder head, a front cover such as an intake / exhaust manifold or a valve mechanism is used. There are various pipes and it is difficult to secure installation space.

  For this reason, it is conceivable that these ignition coils are not directly assembled into one module, but are directly attached to the ignition plugs of the respective cylinders as in the case of direct ignition. However, if this happens, the cylinder head needs to be changed (remade) to assemble the ignition coil that is directly attached to the spark plug. In addition, there is a possibility that the wiring of the ignition coil that is directly attached to the spark plug one by one at the time of inspection or repair may not be able to be easily removed or attached due to the relationship with the peripheral parts of the cylinder head. .

  SUMMARY OF THE INVENTION An object of the present invention is to provide an ignition coil mounting device that can sufficiently secure electric insulation and rigidity and that can efficiently and easily attach and detach wiring while assuming such problems.

  The present invention relates to an electronic power distribution ignition system for an internal combustion engine having a plurality of ignition coils in which a housing includes an ignition control circuit including an igniter and a power transistor together with the ignition coil, and a resin for assembling the plurality of ignition coils into one module A steel plate and a steel plate bracket that forms a mounting surface of the resin bracket on the outer wall of the cylinder head, the resin bracket being fastened to a mounting surface formed by the shelf-shaped portion and the steel plate bracket Each ignition coil is formed with the lower surface of the shelf-like portion as the mounting surface, the secondary high-voltage terminal is exposed upward of the shelf-like portion, and is positioned below the shelf-like portion. The primary connector is assembled so that its insertion port protrudes outward from the shelf. To.

  In this invention, electrical insulation is ensured by the resin bracket. Mounting rigidity is reinforced by the steel plate bracket. The steel plate bracket is an earth body, but since the substrate portion of the resin bracket acts as an insulator, sufficient electrical insulation with respect to the earth body of the high voltage portion of the coil is ensured, and the deterioration of the coil due to corona discharge and A decrease in withstand voltage can be prevented. Each ignition coil is assembled with the lower surface of the shelf portion as the mounting surface, and the secondary high voltage terminal is exposed upward of the shelf portion, and the primary coil is located below the shelf portion. Since the connector on the side protrudes toward the outside of the shelf, the connection of the high tension cord to the high voltage terminal on the secondary side (insertion) and the connection of the harness to the connector on the primary side ( Insertion) can be performed efficiently and easily.

It is explanatory drawing which looks down at the engine main body which concerns on embodiment of this invention diagonally from the side. It is explanatory drawing which similarly looks down at the engine body diagonally from the back It is explanatory drawing which similarly looks down an attachment apparatus from the side of an engine main body diagonally. It is a front view of a resin bracket. It is a side view of a resin bracket. It is a top view of a resin-made bracket. It is a perspective view of the attachment apparatus concerning another embodiment. It is a front view of an attachment device similarly. It is explanatory drawing which similarly looks at an attachment apparatus from the insertion direction of a connector. It is a bottom view of an attachment device similarly. It is explanatory drawing which similarly looks down an attachment apparatus from the side of an engine main body diagonally.

  Based on FIGS. 1-6, the example of application to the electronic power distribution type ignition system of the internal combustion engine which concerns on embodiment of this invention is demonstrated.

  1 and 2, reference numeral 10 denotes an ignition coil attachment device, which is attached to the rear end of the cylinder head 11 via a plurality of leg-like members 13 straddling the pipe 12. Reference numeral 14 denotes a partition wall defining the engine room and the vehicle compartment, and the mounting device 10 is disposed between the engine block and the partition wall (impact absorbing zone) and functions as a collision energy absorbing member.

  Each ignition coil 20 incorporates an ignition control circuit including an igniter and a power transistor together with an ignition coil in a housing (coil unit), and a secondary high-voltage terminal of a corresponding cylinder via a high tension cord 30 Connected to the spark plug, a power source from the battery and an ignition signal from the ECU (electronic control unit) are input to the primary side connector via the harness.

  In each ignition coil 20, the igniter controls ON / OFF of the power transistor based on the ignition signal. When the power transistor is turned on, a current (power source) is conducted to the primary coil of the ignition coil, and when the power transistor is turned off, a high voltage is generated in the secondary coil of the ignition coil to ignite the spark plug (spark). Discharge).

  As shown in FIGS. 3 to 6, each ignition coil 20 includes a main portion 21 that houses an ignition control circuit including an igniter and a power transistor together with the ignition coil, a cylindrical portion 22 that protrudes upward, and a main portion 21. And a primary side connector 23 that extends downward, and is disposed at the tip of the cylindrical portion 22 so that the secondary output terminal is exposed upward. Reference numeral 24 denotes a flange for attaching the ignition coil 20, and a screwing hole for fastening is formed at an end protruding from the housing.

  The mounting device 20 includes a resin bracket 25 that assembles a plurality of ignition coils 10 into one module, and a steel plate bracket 23 that forms a mounting surface of the resin bracket 25 on the outer wall of the cylinder head 11 (FIG. 3). ,reference).

  The resin bracket 25 is formed into a substantially T-shaped cross section from the shelf-like portion 25a and the substrate portion 25b fastened to the mounting surface formed by the steel plate bracket 26. The bottom surface of the shelf-like portion 25a serves as a mounting surface for each ignition coil 20, and a plurality of boss portions 27 are arranged vertically and horizontally on the top surface of the shelf-like portion 25a, and the tubular portion 22 is supported by each boss portion 27. A through hole is formed.

  Each ignition coil 20 has a cylindrical portion 22 having a secondary high voltage terminal protruding upward from the shelf 25a, and a primary connector 23 located below the shelf 25b. The insertion port is assembled so as to protrude toward the outside of the shelf-like portion 25a substantially parallel to the substrate portion 25b, and is fastened to the lower surface of the shelf-like portion 25a via the end of the flange 24, respectively.

  The steel plate bracket 26 includes a steel plate portion 36 a (see FIG. 3) that constitutes the mounting surface of the resin bracket 25, and a leg-like member 13 that supports this on the rear end of the cylinder head 11. The steel plate portion 26 a is formed by a plurality of bent portions 29 into a cross-sectional shape in which concave surfaces and convex surfaces are alternately continued in one direction. The leg-shaped member 13 protrudes so as to straddle the pipe 12 (in the illustrated case, a pipe forming an EGR passage) near the rear end of the cylinder head 11, and the tip thereof is a concave surface (on the cylinder head 11 side) of the steel plate portion 26a. Is a convex surface). The steel plate portion 26a is preferably configured as a heat shield plate in order to protect the ignition coil from heating due to the EGR pipe.

  With such a mounting device 10, the plurality of ignition coils 20 are assembled into one module and are efficiently and intensively arranged in the vicinity of the cylinder head 11. Each ignition coil 20 is electrically insulated by the resin bracket 25. Further, the mounting rigidity of the resin bracket 25 is reinforced by the steel plate bracket 26.

  The steel plate bracket 26 serves as an earth body, but since the substrate portion 25b of the resin bracket 25 is interposed between the high voltage portion of each ignition coil 20 and the earth body, the earth body of the high voltage portion of the ignition coil 20 is provided. The electrical insulation is sufficiently ensured, and the deterioration of the coil and the withstand voltage due to the corona discharge can be prevented.

  Each ignition coil 20 is assembled with the installation space below the shelf 25a, the secondary high-voltage terminal is exposed upward from the tip of the cylindrical portion 22 protruding upward from the shelf 25a, and The primary-side connector 23 located below the shelf-like portion 25a projects its insertion port toward the outside of the shelf-like portion 25a substantially parallel to the substrate portion 25b, so that the secondary-side high-voltage terminal The high tension cord 30 can be connected (inserted from above) and the harness can be connected to the primary connector 23 (inserted from the side) efficiently and easily.

  The steel plate bracket 26 can be attached to the rear end of the cylinder head 11 without hindrance by providing a plurality of leg members 13 straddling the pipe 12. Since the steel plate bracket 26 has a cross-sectional shape in which the steel plate portion 26a has a plurality of bent portions 29, not only the rigidity is improved but also the absorbability of collision energy is improved. Further, the substrate portion 25b of the resin bracket 25 is fastened to the convex surface of the steel plate portion 26a, and the contact area with the substrate portion 25b is reduced by the concave surface of the steel plate portion 26a, so that the electrical insulation can be improved.

  4 to 6, reference numeral 35 denotes a reinforcing rib of the resin bracket 25, which is formed in a substantially triangular shape connecting the substrate and the shelf-like portion at a corner portion of a substantially T-shaped cross section. Thereby, the rigidity (vertical vibration rigidity) of the resin bracket 25 can be increased against engine vibration. In FIG. 2, reference numeral 30a denotes an insulating cap that covers the connection terminal of the high tension cord 30, and when this is fitted into the tip of the cylindrical portion 22, the connection terminal has a high voltage on the secondary side inside the insulating cap 30a. Connected to the terminal. In FIG. 4, reference numeral 36 denotes a screw fastening hole for fastening the substrate portion, and in FIG. 6, reference numeral 37 denotes a screw for fastening the ignition coil.

  As a result, the plurality of ignition coils 20 are efficiently and intensively arranged in the vicinity of the cylinder head 11, and sufficient rigidity and electrical insulation for supporting the load can be secured, and wiring can be easily detached and attached. You can do it. Moreover, about the attachment apparatus which assembles the several ignition coil 20 into one module, it arrange | positions in the impact absorption zone of a vehicle, and can improve the absorbability of collision energy.

  7 to 11 illustrate another embodiment, and the attachment device 10 is attached to the rear end of the cylinder head 11 via a plurality of leg-like members 13 straddling the pipe 12.

  The mounting device 10 includes a resin bracket 25 that assembles a plurality of ignition coils 20 (coil units) into one module, and a steel plate bracket 26 that forms a mounting surface of the resin bracket 25 on the outer wall of the cylinder head 11. Prepare.

  The resin bracket 25 is formed into a substantially T-shaped cross section from the shelf-like portion 25a and the substrate portion 26b fastened to the mounting surface formed by the steel plate bracket 26. The bottom surface of the shelf-like portion 25a serves as a mounting surface for each ignition coil 20, and a plurality of boss portions 27 are arranged vertically and horizontally on the top surface of the shelf-like portion 25a, and the tubular portion 22 is supported by each boss portion 27. A through hole is formed.

  Each ignition coil 20 has a cylindrical portion 22 having a secondary high voltage terminal protruding upward from the shelf 25a, and a primary connector 23 located below the shelf 25a. The insertion port is assembled so as to protrude toward the outside of the shelf-like portion 25a as described later, and is fastened to the lower surface of the shelf-like portion 25a via the end of the flange 24, respectively.

  The resin bracket 25 is set so that the shelf-like portion 25 a has a step 40. In this case, the step portion (the portion where the step 40 is generated) is set at two locations, and the central portion of the shelf-like portion 25a in the direction parallel to the substrate portion 26b is formed in a groove shape. The mounting surface of the ignition coil 20 is divided into three parts by the two steps 40, the bottom part of the groove part in the center part is a low mounting surface, and both side parts sandwiching the central part of the groove part are set as high mounting surfaces. Is done.

  With respect to the arrangement of each ignition coil 20, in the shelf 25a, the two ignition coils 20a and 20b are fastened to the lower mounting surface near the tip away from the base plate 26b via the end of the flange 24, respectively. Each of the ignition coils 20c and 20d is fastened to the mounting surface near the board portion via the end of the flange 24.

  In each ignition coil 20, the low-order connectors 23a and the high-order connectors 23b have their insertion ports facing away from each other. Regarding the relationship between the low-order connector 23a and the high-level connector 23b, the insertion ports are mutually connected. They are directed in the same direction (see FIGS. 9 and 10).

  In addition to the effects similar to those of the above-described embodiment (see FIGS. 1 to 6), the mounting device 10 can also provide ignition coils 20a and 20b near the front end of the center of the shelf 25a and the shelf. Since there is a difference in the height position of the secondary high voltage terminal and the height position of the primary side connector 23 between the ignition coils 20b and 20c near the both side boards of 25a, the secondary side Connection of the high tension cord 30 to the high voltage terminal (insertion from above) and connection of the harness to the primary side connector 23 (insertion from the side) can be performed easily and easily. Further, the rigidity (vibration rigidity in the vertical direction) of the shelf-like portion 25a can be increased by the central portion of the groove-shaped cross section.

  7 to 11, reference numeral 26 denotes a steel plate bracket, and reference numeral 35 denotes a reinforcing rib of the resin bracket 25. The same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals.

  The present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea. For example, the number of ignition coils 20 assembled into one module by the resin bracket 25 is not limited to four. Therefore, the number of the step portions (the set portion of the step 40) of the shelf-like portion 25a is not limited. It is also conceivable to apply the mounting device according to the present invention to an ignition system for an internal combustion engine including a CDI unit (see Patent Document 1).

10 Mounting device 11 Cylinder head 12 Piping (EGR pipe)
13 Leg-shaped member 20 Ignition coil (coil unit)
DESCRIPTION OF SYMBOLS 21 Main part 22 Cylindrical part 23 Primary side connector 24 Flange 25 Resin bracket 25a Shelf-like part 25b Substrate part 26 Steel plate bracket 26a Steel plate part 29 Bending part 30 High tension cord 30a Insulation cap 40 Step

Claims (4)

  In an electronic power distribution ignition system for an internal combustion engine having a plurality of ignition coils that incorporates an ignition control circuit including an igniter and a power transistor together with the ignition coil, a resin bracket for assembling the plurality of injection coils into one module; A steel plate bracket that forms a mounting surface of the resin bracket on the outer wall of the cylinder head, and the resin bracket is formed from a shelf portion and a substrate portion fastened to the mounting surface formed by the steel plate bracket Each ignition coil has a lower side of the shelf-like portion as a mounting surface, the secondary high-voltage terminal is exposed upward of the shelf-like portion, and a primary side located below the shelf-like portion. The connector is assembled so that the connector protrudes toward the outside of the shelf. Mounting device of Tsu Deployment coil.   The ignition coil mounting apparatus according to claim 1, wherein the shelf-shaped portion includes a step for dividing the mounting surface of the injection coil into a plurality of sections.   The ignition coil attachment device according to claim 1 or 2, wherein the steel plate bracket is attached to an outer wall surface of a cylinder head rear end via a plurality of leg-like members straddling a pipe.   The said steel plate bracket is provided with the bending part which gives the cross-sectional shape in which a concave surface and a convex surface continue in one direction to the steel plate part which comprises the attachment surface of the said resin bracket. The ignition coil mounting device according to any one of the above.