JPH04203358A - Distributor for internal combustion engine - Google Patents

Abstract

PURPOSE:To shorten the dimensions in the axial and radial direction by arranging an electronic circuit unit and an ignition coil around a shaft of a distributor, and arranging between a rotary disc and a ball bearing a core of the ignition coil which is provided close to the shaft. CONSTITUTION:An electronic circuit unit 5 of a rotational angle detecting device is formed approximately semicircle and fixed to a housing 2, and at the same time, an ignition coil 7 is arranged on the opposite side within the housing 2. The ignition coil 7 allows a core 72 to be arranged close to a shaft 1, and allows a high voltage tower 71 to be approximately aligned with the axial direction of the shaft 1 and to be installed at the bottom of the housing 2. A rotational angle detecting device assembly 5 is provided with a circuit board 70 in a sector-shaped or semicircle-shaped case made of synthetic resin, and there is formed a photoelectric pickup 60 in a part of the case on the circuit board 70 to obtain a two-storied structure. This constitution enables high degree of freedom of installation in the housing and downsizing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition device for an internal combustion engine, and particularly to the structure of a power distributor incorporating an electronic circuit unit and an ignition coil.

[Conventional technology]

In an electronic control system for an engine, there are rotation angle detection devices built into a power distributor that rotates in synchronization with engine rotation, as described in Branch No. 83-12635 and Japanese Patent Application No. 1-46537. This detection device has a light-emitting element and a light-receiving element facing each other, and a rotating disk with a slit is positioned between them, converting changes in brightness of light into electrical signals and outputting a predetermined signal. It is something.

[Problem to be solved by the invention]

A rotation angle detection device using a photoelectric pickup converts changes in brightness of light into electrical signals by combining a rotating disk with slits and a fixed slit that regulates the optical axis. Further, in some types of power distributors in which an ignition coil is built-in, electronic circuit units 1 to 1 are integrated with functions including a switching element in addition to a rotation angle detecting device.

In the above configuration, the electronic circuit unit has a hole that penetrates through the shaft in the power distribution device, and it is not suitable for being built into the same power distribution device together with one ignition coil, so there is a problem with increasing the size. .

The present invention provides a structure in which the electronic circuit unit and the ignition coil can be arranged in such a manner that the axial and radial dimensions can be shortened by as much as 4-.

[Means to solve the problem]

In order to achieve the above objective, an electronic circuit unit and an ignition coil are arranged around the shaft of the power distributor, and the iron core of the ignition coil is placed close to the shaft, and this iron core connects the rotating disk and ball bearing. It was designed to be located in between.

Further, in order to achieve the above object, the present invention has a rotation angle detection device assembly having a fan-shaped or semicircular shape, and a control circuit (circuit board) inside a fan-shaped or semicircular synthetic resin case. A photoelectric pickup is formed in a part of the synthetic resin case above the control circuit (circuit board), resulting in a two-story structure.

[Effect]

The electronic circuit unit has a substantially semicircular shape and is fixed to the housing, and an ignition coil is arranged on the other side of the inner diameter of the housing.

The iron core of the ignition coil is placed close to the shaft, the direction of the high voltage tower is approximately the same as the axial direction of the shaft, and it is installed at the bottom of the housing.

With this arrangement, the space within the housing can be used effectively, and the entire power distributor can be made smaller in the axial and radial directions. Therefore, weight reduction can be achieved.

In order to enable an ignition coil-integrated power distribution device for an internal combustion engine that incorporates a rotation angle detection device assembly and an ignition coil, the rotation angle detection device assembly is fan-shaped or semicircular, and is made of synthetic resin in the fan shape or semicircle. A control circuit (circuit board) is included in the case, and a photoelectric pickup is formed in a part of the case above the control circuit (circuit board), resulting in a two-story structure and miniaturization.

Thereby, it is possible to provide a small-sized power distributor integrated with an ignition coil for an internal combustion engine.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1 to 7.

The shaft 1 is rotatably attached to a ball bearing 10 and a bearing metal 12 fixed to a housing 2.

A first collar 1 is attached to the upper part of the shaft 1 by a screw 18.
B9 rotating disk 3. A second collar 17 is fixed and can rotate integrally with the shaft 1. The first collar 16 is firmly held by a leaf spring 42 to distribute the power distribution electrode 41 and the bushing 43 integrally.

The cap 6 is an insulating member made of synthetic resin, in which a center electrode 61 is embedded, and the carbon contactor 9 that contacts the power distribution electrode 41 and the coil spring 91 are configured to be electrically connected.

A coil spring 8 is provided in a portion of the center electrode 61 and is in contact with a terminal provided inside a high voltage tower portion 71 of the ignition coil 7 to transmit the generated high voltage to the distribution element 4.

The ignition coil 7 has an iron core 72 and is installed close to the outer periphery of the second collar 17 .

Reference numeral 5 denotes an electronic circuit unit of the rotation angle detection device, which has a function of converting the brightness change of the light passing through the slit provided in the rotation circle @ 3 into an electric signal, and 1 of the ignition coil 7.
It has the function of cutting off the next current.

Reference numeral 15 denotes a capacitor, which is provided to prevent electrical noise generated during secondary voltage discharge of the ignition coil from being applied as radio noise via the power supply line.

A dust cover 19 prevents abrasion powder of the carbon contactor 9 and dust entering from the outside from adhering to the photoelectric element of the electronic circuit unit 5. , the first collar 16, etc., is made of an insulating member to prevent leakage to the ground potential.

The gasket 20 is airtightly installed between the cap 6 and the housing 2, and prevents water from entering from the outside.

Prevent the intrusion of dust, etc.

A pin 13 is provided to attach the coupling 14 to the shaft 1. Reference numeral 11 denotes an oil seal whose outer periphery is press-fitted into the housing 2 and whose inner periphery is in contact with the shaft 1 to prevent engine oil from flowing out.

The housing 2 includes a rotation angle detection device 5°-8= A cap 6 and an ignition coil 7 are fixed.

Here, the shaft 1 rotates in synchronization with the rotation of an engine (not shown), and a signal intermittent by a signal rotor 3 is transmitted as a crank angle position signal of the engine to a control device (not shown) via a rotation angle detection device 5. be done. Further, upon receiving a proper engine ignition timing signal sent from the control device, a high voltage is induced in the ignition coil 7.

This high voltage is applied to the rotor head 4 from the coil electrode 8 via the cap center electrode 9, and is discharged from the rotor head 4 to the cap side electrode 10, and the high voltage is applied to the spark plugs of each cylinder of the engine (not shown). Ru.

FIG. 2 is a diagram with the cap 6 of FIG. 1 removed, and a rotation angle detecting device 5° and an ignition coil 7 are each fixed to the housing 2 with screws (parts not shown).

A power switch (which cuts off the primary current of the ignition coil and induces a high voltage on the secondary side, not shown) terminal integrated with the rotation angle detection device 5 and the ignition coil 7
A harness 12 electrically connected to the terminals of the housing 2 is housed within the housing 2, and has a connector (not shown) for connection with the outside.

Further, a part of the harnesses 12 includes a capacitor 11, which is used to absorb noise when the primary side of the ignition coil 7 is cut off.

FIG. 3 shows the one-rotation angle detection device 5 as a single unit, which is equipped with a bushing 50 for attachment to the housing 2 shown in FIGS. 1 and 2.

The rotation angle detection bag w5 has a fan-shaped shape, and has a circuit board 7o inside the fan-shaped synthetic resin case, and further has a circuit board 7o on the top of the circuit board.

A photoelectric pickup 60 is installed in a part of the synthetic resin case.
It has a two-story structure.

On the other hand, a connector 80 is formed at one end of the fan-shaped synthetic resin case to enable electrical connection with a control device (not shown).

FIG. 4 is a cross section taken along line AA in FIG. 3, and shows that the photoelectric pickup 60 and the circuit board 70 have a two-story structure.

In order to enable a two-story structure, a terminal 9o is efficiently arranged in the fan-shaped synthetic resin case, and
Terminal 80a on the connector 8o side.

80b is similarly arranged and integrally molded.

The terminal 90 includes the photoelectric pickup 60.
The leads 91 are connected by welding to make an electrical connection.

Furthermore, it has a lead frame 92 for electrically connecting the circuit board 70, the terminal 90, and the terminals 80a and 80b on the connector side.

In this way, the major factor that made it possible to create a fan-shaped or semi-circular two-story structure from the conventional donut-shaped circular structure was
The photoelectric conversion circuit and photodiode were previously separated, but now a photo IC has been adopted that integrates them.

FIG. 5 shows a conventional circuit and a circuit using a photo IC (excluding the output circuit section and power supply circuit section).

As described above, according to this embodiment, the rotation angle detection device 15 has a fan-shaped or semicircular shape, and has a circuit board 70 forming an output circuit and a power supply circuit inside the fan-shaped or semicircular synthetic resin case. , a photoelectric conversion circuit and a photodiode are integrated into a part of the case above the circuit board 7o. By forming a photo IC and having a two-story structure, it is possible to make the device compact, and it is possible to provide a small-sized power distribution device integrated with an ignition coil for an internal combustion engine that incorporates the rotation angle detection bag W5.

Next, the internal structure will be explained in more detail using FIGS. 6 and 7.

The fan-shaped rotation angle detection device 5 has connectors 80° terminals 80a, 80b, 80c, and 80d.

The case 5a is composed of 90a, 90b, 90c, 90d, 85, a mounting bush 5o, a photodiode insertion part 61, a light emitting diode insertion part (not shown) corresponding to the photodiode, and the like.

Power 1 to transistor element 74 on heat sink 72;
A control circuit 70 is fixed and electrically connected by wire bonding.

After wire bonding, the resistor RC is trimmed to adjust the primary current flowing through the coil, and a mounting hole 52 is provided.

The control circuit 70 includes a power supply circuit section 70 for the crank angle sensor.
a, an output signal protection circuit section 70b, and a control section 70C for the power switch 74, which are made up of a hybrid integrated thick film circuit board and electronic components. A signal from a control unit (not shown) is supplied to the IB terminal 80d, a base current flows through the power transistor 74, and 1
Current flows through the next coil. At the next moment, the signal from the IB terminal turns OFF, the current is cut off by the power transistor, a high secondary voltage is generated, and the
This is what is supplied to the spark plug.

Also, a lead frame 92a for connection with external terminals.
, 92b, 92c, 92d, 93a.

93b, 93c, 93d, and 95.

The case 5a includes a photo IC 60a and a light emitting diode 6.
0b is fixed with an adhesive (not shown), and these lead wires 91a, 91b, 91c, and 91d.

91e is fixed (welded) to 90a, 90b, 90c, 90d (not shown), and 90e (not shown) for electrical continuity, and the photoelectric pickup 60
It consists of

After forming the photoelectric pickup 6o on the case 5a, the control circuit assembly is fixed to the case 5a with an adhesive (not shown).

Then terminals 80a, 80b, 80c.

80d, 85, 90a, 90b, 90c, and 90d are lead frames 92a formed on the control circuit 70;
, 92b, 92c, 92d, 93a.

93b, 93c, 93d, and 95 are joined by welding or the like to enable electrical continuity. These terminal 9
0a, 90b, 90c, 90・d.

90e is arranged by effectively arranging electrical common terminals, and three photo ICs are welded to the upper part and two light emitting diodes are welded to the lower part.

On the other hand, after these are bonded and connected, the pickup section cover 15. The control circuit section 25 is bonded and fixed, and the control circuit section 70. Photoelectric pickup 6
0 and each internal joint.

〔Effect of the invention〕

According to the present invention, it is possible to provide a small-sized ignition coil-integrated power distribution device for an internal combustion engine that incorporates a rotation angle detection device.

On the other hand, by using a fan-shaped or semicircular rotation angle detection device, there is no need to consider interference with the ignition coil, the degree of freedom in mounting to the housing is high, and miniaturization is possible.

Furthermore, it is possible to maintain a distance between the ignition coil and the rotation angle detection device, which has the effect of reducing the effects of noise and the like when the current of the ignition coil is temporarily cut off.

According to another aspect of the present invention, it is possible to construct a power distributor having a built-in ignition coil, a rotation angle detection device, and an electronic circuit unit having a function of interrupting the primary current of the ignition coil to be small and lightweight.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a top view with the cap of Fig. 1 removed, Fig. 3 is a partially cutaway perspective view of the rotation angle detection device, and Fig. 4 is , FIG. 5 is a circuit diagram of the rotation angle detection device of this embodiment using a photo IC, FIG. 6 is an exploded perspective view of the pickup section, and FIG. 7 is a cross-sectional view taken along line AA in FIG. 6 is a detailed circuit diagram of FIG. 5. FIG. DESCRIPTION OF SYMBOLS 1... Shaft, 2... Housing, 3... Signal rotor, 5... Rotation angle detection device, 7... Ignition coil, 60... Photoelectric pickup (photo IC)
-70...Circuit board, 9o...Terminal, 92.
・・Leadoff ■ 117--473- Figure 4 Figure 5 Photo IC chip

Claims (1)

[Claims] 1. A shaft that rotates in synchronization with the engine crankshaft, a rotary plate that rotates together with the shaft and has a predetermined slit, and a photoelectric pickup that detects signals by the rotation of the rotary plate. In the rotation angle detection device assembly including an electronic circuit for amplifying the signal of the pickup, and a synthetic resin case for housing the photoelectric pickup section and the electronic circuit section, the synthetic resin case is shaped like a fan or a fan-shaped case. For an internal combustion engine, which is semicircular and has a two-story structure in which the control circuit is contained in the fan-shaped synthetic resin case, and a photoelectric pickup is formed in a part of the case above the control circuit. power distributor. 2. The power distribution device for an internal combustion engine according to claim 1, wherein the photoelectric pickup includes a light receiving section formed of a photo IC. 3. A power distribution device for an internal combustion engine according to claim 1, wherein the photoelectric pickup has a light receiving section side located on a power distribution cap side. 4. A power distribution device for an internal combustion engine according to any one of claims 1 to 3, wherein the ignition coil is built in the power distribution device. 5. The power distributor for an internal combustion engine according to claim 4, wherein the ignition coil is located approximately 180 degrees opposite the photoelectric pickup. 6. A shaft that rotates in synchronization with the engine crankshaft, a rotating disk that rotates integrally with this shaft and has a predetermined slit, a rotation angle detection device that converts changes in brightness and darkness of this slit into electrical signals, and an ignition coil. In a power distributor incorporating a switching device that interrupts a primary current, the rotation angle detection device and the switching device constitute an integrated electronic circuit unit, and the iron core of the ignition coil is provided close to the shaft, A power distribution device for an internal combustion engine, characterized in that the iron core is located between the rotating plate and a ball bearing supporting the shaft. 7. The power distribution device for an internal combustion engine according to claim 6, wherein the output tower of the ignition coil is inclined outwardly with respect to the rotating shaft. 8. In claims 6 and 7, the rotation angle detection device is housed in a substantially fan-shaped resin case, and the ignition coil and the resin case are installed at approximately 180 degrees opposite positions across the rotating shaft. The power distribution device for an internal combustion engine is further characterized in that the output tower of the ignition coil is inclined in a direction away from the resin case. 9. An internal combustion engine according to claims 6 to 8, characterized in that the core of the ignition coil is a square-shaped core located at a position substantially perpendicular to the rotating shaft and substantially parallel to the bottom of the power distributor. Engine power distribution equipment. 10. A power distributor for an internal combustion engine according to any of claims 6 to 9, characterized in that the high voltage lead-out wiring of the ignition coil extends to the center electrode at an angle along the slope of the power distributor cap. 11. A shaft that rotates in synchronization with the engine crankshaft, a rotary plate that rotates together with this shaft and has a predetermined slit, a photoelectric pickup that detects signals by the rotation of this rotary plate, and a signal from this pickup that In a rotation angle detection device assembly including an electronic circuit for amplification, a synthetic resin case housing the photoelectric pickup unit and the electronic circuit unit, the synthetic resin case is fan-shaped or semicircular, and the fan-shaped A power distribution device for an internal combustion engine, characterized in that it has a two-story structure in which the control circuit is contained in a synthetic resin case, and a photoelectric pickup is formed in a part of the case above the control circuit.