JP3872727B2 - Wiring structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiring structure that can reduce a wire harness around an engine of an automobile of an internal combustion engine.
[0002]
[Prior art]
An internal combustion engine automobile engine is equipped with many electrical components because electronic control such as fuel injection control and ignition timing control is widely performed, and these electrical components are arranged around the engine head cover. is there. A wire harness is used to electrically connect the electrical components, and the current engine is configured with a wire harness of about 100 circuits. For example, as shown in FIG. 3, the wiring harness is routed so as to surround the periphery of the engine 30, and the wiring harness 31 from the electrical component includes a grounding wire. Some are connected to a circuit or an engine control unit (ECU). Since the ECU is provided in the ECU BOX in the vehicle compartment or the engine room, the wire harness 31 routed from the electrical components such as sensors arranged around the engine to the ECU becomes long and Becomes complicated.
[0003]
As described above, the path of the wire harness 31 is very complicated, has many branches, and creates a complicated shape of the wire harness. Therefore, to prevent interference of electrical components and the like, and to prevent mutual interference between the wire harnesses 31. In addition, since an external part (wire harness interference protection material) such as a protector / corrugated tube is attached to the wire harness 31, the mass of the wire harness 31 increases.
[0004]
In addition, a clamp is used to connect the wire harness 31 to the electrical component, but since this clamp is a bolt tightening type, it can be fixed very firmly. To remove the wire harness 31 from the electrical component, Bolts must be removed individually, and workability is poor.
[0005]
[Problems to be solved by the invention]
Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a wiring structure capable of reducing the number of wire harnesses.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the wiring structure of the present invention has a case in which a case in which a coil portion of an ignition coil is housed and fixed is provided at a central portion in the width direction of the engine head cover along the longitudinal direction thereof. A mounting groove that is opened in one direction along the longitudinal direction is formed at a location including the plurality of storage holes, and a mounting portion that is slidably engaged with the mounting groove and an ECU are mounted. A resin plate integrally formed with resin, a circuit part attached to the head cover side of the mounting part, and a connector provided integrally with the circuit part and positioned below the ECU part A circuit formed of a flexible flat cable or a flexible circuit integrally formed on the resin plate. A routing body is detachably mounted on the engine head cover by slidingly engaging the mounting portion in the mounting groove from the opening side, and the mounting portion of the resin plate attaches the circuit routing body to the engine head cover. A through hole which is disposed at a position corresponding to the accommodation hole and forms a part of the accommodation hole in a state where it is mounted on the ground, and a ground circuit, a power supply circuit, and a coil circuit of the ignition coil are provided in the circuit portion. And a connecting terminal to which the coil circuit is connected is disposed so as to contact a side portion of the through hole of the mounting portion, and when the case is inserted and fixed to the accommodation hole and the through hole, connected to the coil portion provided in the case of side a and the connection terminal and the connection terminal are electrically connected, wherein the connector portion, the grounding circuit, the power supply circuit, the carp A first electrical component and a second electrical component, such as a sensor and an actuator, having an internal connector and an external connector connected to a circuit and wiring connected to the ECU, respectively, and connected to the internal connector via a wire harness The earth circuit, the power circuit, the coil circuit, and the ECU are electrically connected, and a power source is connected to the external connector via a wire harness.
[0007]
By comprising in this way, a wire harness can be decreased and wiring of a wire harness can be performed easily. That is, when the electrical components of the ground circuit, the power supply circuit, and the engine control unit are installed away from the engine member, the electrical components such as sensors disposed around the engine are connected to the electrical components. Requires a relatively long wire harness and complicates the wiring of the wire harness. Moreover, if the electrical components of the ground circuit, the power supply circuit, and the engine control unit are arranged apart from each other, the wiring harness connecting these electrical components and the outside becomes complicated. On the other hand, by providing a circuit arrangement body in the engine member so as to be detachable, a long wire harness is not required to connect the electrical component disposed around the engine and the electrical component. Can be connected. Moreover, since the circuit arrangement body includes the ground circuit, the power supply circuit, and the engine control unit, the wiring harness that connects these electrical components and the outside can be easily arranged. Therefore, the number of wire harnesses can be reduced and the wiring harness can be easily routed.
[0008]
Further, the head cover of the engine member has a housing hole for housing the coil portion of the ignition coil, and the circuit wiring body is provided with a through hole formed as a part of the housing hole. the coil circuit of the coil portion and the electrical contact housed in provided, by providing this circuit Haisakutai in the head cover, since the coil circuit constituting a point fire coil is also provided on the circuit wiring member, The number of wire harnesses can be reduced, and the wiring harness can be easily routed.
[0009]
Furthermore, the circuit wiring body, before SL engine member, by provided engaged sliding engagement, it is possible to easily desorb the circuit wiring body from the engine member, easily removed during dismantling Can be easily recycled.
[0010]
Furthermore, the circuit wiring body, by formed by molding integrally with the resin plate and the circuit member, it is possible to contribute to weight reduction of the engine.
[0011]
Further, the circuit body, by being constituted by a flexible flat cable or a flexible circuit, can be easily produced the circuitry body.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 are diagrams showing a wiring structure of the present invention. 1 and 2, reference numeral 1 denotes a circuit arrangement, and the circuit arrangement 1 is detachably provided on an engine head cover 2 that is one of engine members of an internal combustion engine, for example, an automobile engine. In the illustrated example, the circuit routing body 1 is provided on the engine head cover 2, but any engine member may be used. For example, it may be provided on the engine body.
[0013]
The engine head cover 2 is firmly attached to the upper part of the engine body by a fastening member such as a bolt.
A plurality of, for example, four accommodation holes 4 are provided at a substantially central portion in the width direction of the engine head cover 2 at predetermined intervals along the longitudinal direction of the cover 2 to accommodate a coil portion (not shown) of the ignition coil 3. It has been. The housing hole 4 is formed in a substantially reverse convex shape with a large area on the cover opening side, and a substantially reverse convex case 5 in which, for example, a coil portion is housed and fixed is inserted and fixed in the housing hole 4. A connection terminal (not shown) connected to the coil portion is provided on the upper side portion of the case 5.
[0014]
A mounting groove 6 in which a portion including the accommodation hole 4 is cut out in a substantially concave shape is formed along the longitudinal direction at a substantially central portion of the engine head cover 2 in the width direction. 1 is detachably provided.
The circuit routing body 1 is preferably mounted in the mounting groove 6 so that it can be easily attached and detached. For example, one of the mounting grooves 6 is opened so that the circuit routing body 1 is slidably engaged. It may be.
Specifically, for example, slide grooves 8 and 8 having substantially concave cross sections extending along the longitudinal direction are formed in opposing wall portions 7 and 7 forming the mounting groove 6, respectively, and the circuit routing body 1. In addition, engagement portions 9 and 9 having a substantially convex cross section that engage with the slide grooves 8 and 8 may be provided.
[0015]
The circuit arrangement body 1 has a ground circuit, a power supply circuit, and an engine control unit (ECU), and has an internal connector 10 and an external connector 11 connected to these electrical components, and is slidably engaged with the mounting groove 6. It is preferable to configure as described above. In the circuit arrangement 1, four through holes 12 formed as a part of the accommodation hole 4 are provided in the illustrated example.
The circuit arrangement body 1 may be configured in any manner, but for example, it is preferable to form the circuit arrangement body 1 in a flat shape from the resin plate 13 that is an attachment portion and the circuit body 14.
[0016]
The resin plate 13 is integrally formed of, for example, resin from a mounting portion 15 that is slidably engaged with the mounting groove 6 and an ECU portion 17 in which the ECU 16 is mounted.
The mounting portion 15 is formed in a flat plate shape that is slightly shorter than the width of the mounting groove 6 and shorter in the longitudinal direction than the mounting groove so as to be accommodated in the mounting groove 6. Four through-holes 12 are formed in the mounting portion 6 at a predetermined interval (substantially the same interval as the accommodation hole 4) along the longitudinal direction. These through holes 12 are arranged so as to be in substantially the same positions as the respective accommodation holes 4 when the circuit arrangement body 1 is attached to the attachment groove 6.
At the center in the thickness direction of the two side portions 15 a extending along the longitudinal direction of the mounting portion 15, there is a substantially convex cross section extending along the longitudinal direction and engaging the slide groove 8. A joint portion 9 is provided. The engaging part 9 may be provided in the entire longitudinal direction of the side part, or may be provided in a part of a plurality of places with a predetermined interval.
One end of the mounting portion 15 (insertion tip when inserted into the slide groove 8) is formed in an R shape so that it can be easily inserted into the slide groove 8. An ECU unit 17 is provided at the other end of the mounting unit 15.
[0017]
The ECU unit 17 is formed in a box shape with an open top, and a connection unit 18 that is electrically connected to the ECU 16 to be mounted is provided at the bottom. The upper part of the ECU unit 17 is closed by fixing the ECU cover 19 with screws, for example.
[0018]
The circuit body 14 includes a circuit portion 20 attached to the head cover 2 side of the mounting portion 15 of the resin plate 13, and a connector portion provided integrally with the circuit portion 20 and positioned below the ECU portion 17. 21 and is provided integrally with the resin plate 13.
[0019]
The circuit unit 20 is provided with a coil circuit of an ignition coil, for example, an igniter circuit, and this igniter circuit or a connecting terminal 22 connected to the igniter circuit is arranged so as to contact the side portion of the through hole 12 of the mounting unit 15. As shown in FIG. 2, when the case 5 is housed and fixed in the housing hole 4 and the through hole 12, each connection terminal and the igniter circuit or the connecting terminal 22 are electrically connected.
The circuit unit 20 is provided with electrical components such as an earth circuit and a power supply circuit. This electrical component is different from the first electrical component such as a sensor that directly grasps the state of the engine and an actuator that directly operates the engine. The first electrical component is a second electrical component that is connected by a wire harness. is there.
[0020]
The connector part 21 has an internal connector 10 and an external connector 11, and these internal and external connectors 10 and 11 are arranged in parallel so that a connector such as a wire harness is fitted and connected along the longitudinal direction of the circuit part 20. Has been placed. The internal connector 10 is a connector to which the first electrical component is connected via a wire harness or the like, and the external connector 11 is a connector to which a wire harness from the outside such as a power source is connected.
[0021]
The internal connector 10 and the external connector 11 are connected to wirings such as a printed circuit board, and these wirings are connected to the ground circuit, power supply circuit, coil circuit, and ECU 16 of the circuit unit 20, respectively.
Thus, the circuit body 14 may be configured in any manner as long as it is a flat type. Specifically, for example, the circuit body 14 is preferably configured by a flexible flat cable or a flexible circuit.
[0022]
In order to attach the circuit arrangement body 1 to the engine head cover 2, first, the ECU 16 is electrically connected to the connection portion 18 to the ECU portion 17 of the resin plate 13 formed integrally with the circuit body 14. Wear as follows. An ECU cover 19 is put on the upper part of the ECU unit 17 and the ECU cover 19 is fixed with, for example, a screw to close the upper part of the ECU unit 17.
[0023]
The circuit routing body 1 is slidably engaged with the mounting groove 6 from one end of the mounting portion 15. That is, the engaging portion 9 of the mounting portion 15 is slidably engaged with the slide groove 8 as shown in FIG.
By mounting the circuit arrangement body 1 in this way, the accommodation hole 4 of the engine head cover 2 and the through hole 12 of the resin plate 13 are in substantially the same position, so that the ignition plug 3 is placed in the accommodation hole 4 and the through hole 12. The case 5 in which the coil part is accommodated is inserted and fixed. When the case 5 is fixed, each connection terminal of the case 5 and the igniter circuit or the connecting terminal 22 of the circuit unit 14 are electrically connected.
[0024]
Then, the first electrical component such as a sensor for directly grasping the state of the engine or an actuator for directly operating the engine and the internal connector 10 of the circuit routing body 1 are connected by a wire harness. As a result, the ground circuit, the power supply circuit, the coil circuit (igniter circuit) and the ECU, which are the second electrical components provided in the circuit body 14, are electrically connected to the first electrical component.
Further, an external wire harness such as a power source is connected to the external connector 11 of the circuit arrangement body 1.
[0025]
Thereby, while being able to reduce a wire harness, wiring of a wire harness can be performed easily. That is, if the electrical components of the ground circuit, power supply circuit, and engine control unit are installed away from the engine member, comparison is required to connect the first electrical components such as sensors disposed around the engine. A long wire harness is required and the wiring of the wire harness becomes complicated. Moreover, if the electrical components of the ground circuit, the power supply circuit, and the engine control unit are arranged apart from each other, the wiring harness connecting these electrical components and the outside becomes complicated. On the other hand, by providing a circuit wiring body in the engine head cover, it is possible to connect without requiring a long wire harness to connect the electrical components disposed around the engine and the electrical components. Can do. Moreover, since the circuit arrangement body includes the ground circuit, the power supply circuit, and the engine control unit, the wiring harness that connects these electrical components and the outside can be easily arranged. Therefore, the number of wire harnesses can be reduced and the wiring harness can be easily routed.
[0026]
Further, by providing the circuit arrangement body with the coil circuit that constitutes the ignition coil, the number of wire harnesses can be reduced and the wiring harness arrangement can be easily performed.
[0027]
In addition, by sliding the circuit arrangement body into the engine head cover, the circuit arrangement body can be easily detached from the engine member, so it can be easily removed during disassembly and easily recycled. Can be used.
[0028]
Moreover, since the circuit arrangement body is formed by integrally molding the resin plate and the circuit body, it is possible to contribute to weight reduction of the engine.
Moreover, a circuit body can be easily manufactured because a circuit body is comprised with the flexible flat cable or the flexible circuit.
[0029]
【The invention's effect】
In short, according to the first aspect of the invention, the number of wire harnesses can be reduced and the wiring harness can be easily routed.
[0030]
Also, since the coil circuit constituting a point fire coils are provided on the circuit wiring member, so that is easily achieved routing of the wire harness it is possible to reduce more wire harnesses.
[0031]
Furthermore, because it is easy to desorb the circuit wiring body from the engine member, it can be easily removed during disassembly, it can easily Kyosu recycling.
[0032]
Furthermore, it is possible to contribute to weight reduction of the engine.
[0033]
Further, it is possible to easily manufacture the circuitry body.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an example of a wiring structure of the present invention.
FIG. 2 is a cross-sectional view showing a state in which the circuit arrangement of the present invention is mounted on an engine head cover.
FIG. 3 is a perspective view showing a conventional wiring structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit arrangement body 2 Engine head cover 3 Ignition coil 4 Accommodating hole 10 Internal connector 11 External connector 12 Through hole 13 Resin plate 14 Circuit body 16 ECU (engine control unit)

Claims (1)

The engine head cover is provided with a plurality of receiving holes at the center in the width direction at predetermined intervals along the longitudinal direction thereof, each of which accommodates and fixes a case in which the coil portion of the ignition coil is received and fixed. A mounting groove opened on one side along the longitudinal direction is formed at a location including the hole,
A mounting plate that slides into the mounting groove and an ECU unit on which the ECU is mounted are integrally formed of a resin plate, a circuit unit that is mounted on the head cover side of the mounting unit, and the circuit unit. And a circuit arrangement formed by a flexible flat cable or a circuit body constituted by a flexible circuit, which is provided integrally with the resin plate and is provided with a connector portion located below the ECU portion, The mounting portion is detachably mounted to the engine head cover by slidingly engaging the mounting portion from the opening side with the mounting groove,
The mounting portion of the resin plate has a through hole that is disposed at a position corresponding to the storage hole in a state in which the circuit wiring body is mounted on the engine head cover, and forms a part of the storage hole.
The circuit portion is provided with a ground circuit, a power supply circuit, and a coil circuit of the ignition coil, and a connection terminal to which the coil circuit is connected is disposed so as to contact a side portion of the through hole of the mounting portion,
When the case is inserted and fixed into the accommodation hole and the through hole, wherein the connected connection terminals to the coil portion provided on the side of the case and connecting terminals are electrically connected,
The connector has an internal connector and an external connector connected to the ground circuit, the power supply circuit, the coil circuit, and the ECU, and is connected to the internal connector via a wire harness. The grounding circuit, the power supply circuit, the coil circuit, and the ECU, which are the first electrical component and the second electrical component such as a sensor and an actuator, are electrically connected, and the power supply is connected to the external connector via a wire harness. Wiring structure characterized by being made.

Images