JP2624892B2 - Distributor for internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine, and more particularly to a structure of a power distribution device having a built-in electronic circuit unit and an ignition coil.

[Prior Art] In an electronic control system of an engine, a rotation angle detection device built in a power distribution device that rotates in synchronization with the rotation of the engine is disclosed in Japanese Patent Publication No. 83-12635, Japanese Patent Application Laid-Open No. 2-227560, and
There is one as described in Japanese Patent No. 27164. In this detection device, a light-emitting element and a light-receiving element are opposed to each other, and a rotating disk having a slit is positioned between the light-emitting element and the light-receiving element. Things.

[Problems to be solved by the invention]

A rotation angle detecting device using a photoelectric pickup converts a light / dark change of light into an electric signal by a combination of a rotating disk having a slit and a fixed slit for regulating an optical axis. Further, in a type in which an ignition coil is built in a power distribution device, there is a type in which an electronic circuit unit in which a function having a switching element is integrated in addition to a rotation angle detection device is configured.

In the above configuration, the electronic circuit unit has a hole that penetrates the shaft in the power distribution device, and is not suitable for being built in the same power distribution device together with the ignition coil. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure capable of reducing the axial and radial dimensions when arranging an electronic circuit unit and an ignition coil.

It is a further object of the present invention to provide such a distributor in which the electrical connection between the photoelectric pickup and the electronic circuit can be automated. Still another object of the present invention is to provide a power distribution device of this kind that can automate the operation of assembling the photoelectric pickup and the control circuit in a synthetic resin case.

[Means for solving the problem]

In order to achieve the above object, an electronic circuit unit and an ignition coil are arranged around a shaft of a distributor, and an iron core of the ignition coil is provided close to the shaft, and the iron core is provided between a rotating disk and a ball bearing. The output tower of the ignition coil is inclined outwardly with respect to the shaft, while being located therebetween.

Further, in order to achieve the above object, the present invention has a control circuit (circuit board) in a fan-shaped or semi-circular synthetic resin case, wherein the shape of the rotation angle detecting device assembly is a sector or a semi-circle, A photoelectric pickup is formed in a part of a synthetic resin case on the control circuit (circuit board) to form a two-story structure, and a connector portion having input / output terminals is integrally formed in the case, and The lead frame of the control circuit, the input / output lead of the photoelectric pickup, and the terminal of the connector are implanted substantially perpendicularly to the bottom surface of the case and electrically connected to each other.

In addition, a photoelectric pickup is formed in a part of the synthetic resin case above the control circuit to form a two-story structure, and the back surface of the heat sink to which the control circuit is attached becomes the bottom surface of the synthetic resin case. The control circuit is mounted on the lower side of the synthetic resin case with the control circuit inside, and an opening for joining the lead frame of the control circuit to the input / output lead wire of the photoelectric pickup and the input of the control circuit are provided. An opening for joining the output lead frame to the terminal of the external connector is provided on the upper surface of the synthetic resin case, and a cover for closing the opening is provided.

[Action]

The electronic circuit unit has a substantially semicircular shape, is fixed to the housing, an ignition coil is arranged on the other side of the inner diameter of the housing, the iron core of the ignition coil is close to the shaft, and the high-pressure tower is located outward with respect to the axial direction of the shaft. Install at an angle.

By arranging, the space in the housing can be used effectively, and the influence of noise can be reduced while reducing the size of the entire power distributor in the axial and radial directions.

A photoelectric pickup is formed in a part of the case on the control circuit (circuit board) to form a two-story structure,
Connection terminals, lead frames, and lead wires are erected almost perpendicularly from the bottom of the case and joined together, so that many joints can be joined from the same direction, enabling automation. .

In addition, the bottom of the resin case is formed with a heat sink to which the control circuit is attached, and the upper opening for connecting the terminals is covered with a cover. It became possible to do.

〔Example〕

 One embodiment of the present invention is shown in FIGS.

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

The first collar 1 is screwed on the upper part of the shaft 1 with screws 18.
6, the rotating disk 3 and the second collar 17 are fixed and can rotate integrally with the shaft 1. On the first collar 16, the electric distribution 4 integrally formed with the distribution electrode 41 and the bush 43 is firmly held by a leaf spring 42.

The cap 6 is an insulating member made of synthetic resin, in which the center electrode 61 is buried, and the carbon contact 9 in contact with the distribution electrode 41 and the coil spring 91 are electrically connected.

A coil spring 8 is provided on a part of the center electrode 61, and comes into contact with a terminal provided inside the high-voltage tower 71 of the ignition coil 7, so that the generated high voltage is transmitted to the electric distribution unit 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 detecting device, which has a function of converting a change in darkness or darkness of light passing through the slit provided on the rotating disk 3 into an electric signal, and interrupts a primary current of the ignition coil 7. Function.

Reference numeral 15 denotes a capacitor provided to prevent electric noise generated at the time of secondary voltage discharge of the ignition coil from being applied as radio noise via a power supply line.

Reference numeral 19 denotes a dust cover which prevents abrasion powder of the carbon contactor 9 and dust which has entered from the outside from adhering to the photoelectric element of the electronic circuit unit 5 and a high voltage applied to the electric distribution unit 4 to the shaft 1. , The first collar 16 and the like are constituted by insulating members for preventing leakage with respect to the ground potential.

The packing 20 is installed between the cap 6 and the housing 2 in an airtight manner, and prevents water, dust and the like from entering from outside.

Reference numeral 13 denotes a pin, which is provided for attaching the coupling 14 to the shaft 1. Reference numeral 11 denotes an oil seal, the outer periphery of which is press-fitted into the housing 2 and the inner periphery of which contacts the shaft 1 to prevent the engine oil from flowing out.

The housing 2 includes a rotation angle detecting device 5 and a cap.
6, The ignition coil 7 is fixed.

Here, the shaft 1 rotates in synchronization with the rotation of the engine (not shown), and a signal intermittently output by the signal rotor 3 is used as a crank angle position signal of the engine to detect the rotation angle of the engine 5.
Is transmitted to a control device (not shown). Further, a high voltage is induced in the ignition coil 7 upon receiving an appropriate engine ignition timing signal sent from the control device.

The high voltage is supplied from the coil electrode 8 to the rotor head 4 via the cap center electrode 9, and is discharged from the rotor head 4 to the cap side electrode 10. The high voltage is applied to the ignition plug of each cylinder of the engine (not shown).

FIG. 2 is an illustration of the cap 6 of FIG. 1 with the cap 6 removed.
A rotation angle detection device 5 and an ignition coil 7 are fixed to the housing 2 by screws (partially 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) and a terminal of the ignition coil 7 which are integrated with the rotation angle detecting device 5 are connected to each other. The electrically connected harnesses 12 are housed in the housing 2 and have connectors (not shown) for connection to the outside.

Further, a part of the harnesses 12 has 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 rotation angle detecting device 5 alone.
A bush 50 for attachment to the housing 2 shown in FIGS. 1 and 2 is provided.

The shape of the rotation angle detecting device 5 is a fan shape, and a circuit board 70 is provided inside the fan-shaped synthetic resin case. Further, the synthetic resin case is provided above the circuit board. A photoelectric pickup 60 is formed in a part, and has a two-story structure.

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

FIG. 4 is a sectional view taken along the line AA of 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, the terminal 90 is efficiently arranged in the fan-shaped synthetic resin case,
Terminals 80a and 80b on the connector 80 side are similarly arranged, and are integrally molded.

The terminal 90 is electrically connected to the lead 91 of the photoelectric pickup 60 by welding.

Further, a lead frame 92 for electrically connecting the circuit board 70 to the terminals 90 and the terminals 80a and 80b on the connector side is provided.

As described above, a large element that enables a conventional donut-shaped circular or fan-shaped or semi-circular two-story structure is one in which a photoelectric conversion circuit and a photodiode are conventionally separated from each other. That is, IC was adopted.

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

As described above, according to the present embodiment, the rotation angle detecting device 5 has a fan shape or a semicircle, and has a circuit board 70 for forming an output circuit and a power supply circuit in a fan shape or a semicircle synthetic resin case. A photoelectric conversion circuit and a photodiode were integrated in a part of the upper case of 70. By forming a photo IC and having a two-story structure, the size can be reduced, and a compact ignition coil integrated power supply for an internal combustion engine incorporating the rotation angle detection device 5 can be realized.

Next, the internal structure will be described in more detail with reference to FIGS.

The sector-shaped rotation angle detecting device 5 includes a connector 80, terminals 80a, 80b, 80c, 80d, 90a, 90b, 90c, 90d, 85, a mounting bush 50, a photodiode insertion portion 61, and a light emitting diode corresponding to the photodiode. A power transistor element 74 and a control circuit 70 are fixed on a case 5a and a heat sink 72, which are constituted by components (not shown) and the like, and are electrically connected by wire bonding.

The resistance RC is trimmed after wire bonding to adjust the primary current flowing through the coil. Further, a mounting hole 52 is provided.

The control circuit 70 includes a power circuit 70a of the crank angle sensor,
Output signal protection circuit section 70b, control section 70C of power switch 74
Which consist 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, so that a base current flows through the power transistor 74 and a current flows through the primary coil. At the next moment, the signal from the IB terminal is turned off, and the temporary current is cut off by the power transistor.
A secondary voltage is generated and supplied to a spark plug (not shown).

Also, a lead frame 92a for connection to an external terminal,
92b, 92c, 92d, 93a, 93b, 93c, 93d, 95 are provided.

A photo IC 60a and a light emitting diode 60b are fixed to the case 5a with an adhesive (not shown).
b, 91c, 91d, 91e, 90a, 90b, 90c, 90 not shown connection part
d, the connection part is fixed (welded) to each of the parts 90e (not shown) so as to establish electrical continuity, thereby constituting the photoelectric pickup 60.

After the photoelectric pickup 60 is formed in the case 5a, the control circuit unit is fixed to the case 5a with an adhesive (not shown).

After that, terminals 80a, 80b, 80c, 80d, 85, 90a, 90b, 90
c, 90d are connected to the lead frames 92a, 92b, 92c, 92d, 93a, 93b, 93c, 93d, 95 formed on the control circuit 70 by welding or the like to enable electrical conduction. . The arrangement of these terminals 90a, 90b, 90c, 90d, and 90e is devised by effectively arranging the electric common terminal, etc.
Two light emitting diodes are welded to the book and the lower part.

On the other hand, after these bonding and connection are completed, the pickup cover 15 and the control circuit section 25 are bonded and fixed, and the control circuit 70, the photoelectric pickup 60 and the respective internal connection sections are joined from the viewpoint of environmental resistance and mechanical external force. Is protected.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, the ignition coil integrated type | mold distributor for internal combustion engines with a built-in rotation angle detection apparatus can be provided.

On the other hand, the fan-shaped or semi-circular rotation angle detection device does not need to consider interference with the ignition coil, has a high degree of freedom in mounting to the housing, and can be downsized.

Further, it is possible to keep the distance between the ignition coil and the rotation angle detecting device, and there is also an effect that the influence of noise or the like when the ignition coil temporarily interrupts the current can be reduced.

According to another aspect of the invention, and still further, an ignition coil,
A small and lightweight power distribution device incorporating a rotation angle detection device and an electronic circuit unit having a primary current interrupting function of an ignition coil can be configured to be small and light, and an electrical connection between a control circuit, a photoelectric pickup, a control circuit and an external connector can be achieved. Connections can be automated. Further, there is an effect that the assembly of the rotation angle detection unit can be automated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one 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 a rotation angle detecting device, and FIG. 3 is a cross-sectional view taken along line AA of FIG. 3, FIG. 5 is a circuit diagram of the rotation angle detecting device of this embodiment using a photo IC, FIG. 6 is an exploded perspective view of a pickup section, and FIG. FIG. 6 is a detailed circuit diagram of 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, 90 …… Terminal, 92 …… Lead frame.

Continuation of the front page (72) Inventor Mitsutoshi Nakane 2477 Kashima-Yatsu, Kata-shi, Ibaraki Pref. Within Hitachi Automotive Engineering Co., Ltd. (56) References JP-A-2-227560 (JP, A JP-A-2-27164 (JP, A) JP-A-63-146169 (JP, U) JP-A-61-169284 (JP, U)

Claims (10)

(57) [Claims] 1. A shaft that rotates in synchronization with a crankshaft of an engine, a rotating plate that rotates integrally with the shaft and has a predetermined slit, a photoelectric pickup that detects a signal by rotation of the rotating plate, and the pickup. A control circuit that amplifies the signal of the rotation angle detecting device assembly including a synthetic resin case that houses the photoelectric pickup unit and the electronic circuit unit, wherein the synthetic resin case is a fan shape or a semicircle, The synthetic resin case has the control circuit, a two-story structure in which a photoelectric pickup is formed in a part of the case above the control circuit, and a connector having input / output terminals. The lead frame of the control circuit, the input / output lead of the photoelectric pickup, and the terminal of the connector are integrally formed on a case. Internal combustion engine distributor, characterized in that the electrically joined to each other substantially perpendicularly erected form against the bottom surface. 2. A power distribution device for an internal combustion engine according to claim 1, wherein said photoelectric pickup includes a light receiving section comprising a photo IC. 3. The power distribution device for an internal combustion engine according to claim 1, wherein the light receiving section of the photoelectric pickup is located on the power distribution cap side. 4. The power distribution device for an internal combustion engine according to claim 1, wherein the ignition coil is built in the power distribution device. 5. A power distribution device for an internal combustion engine according to claim 4, wherein said ignition coil is located substantially 180 ° opposite to said photoelectric pickup. 6. A shaft that rotates in synchronization with a crankshaft of an engine, a rotating disk that rotates integrally with the shaft and has a predetermined slit, a rotation angle detecting device that converts a change in brightness of the slit into an electric signal, In a power distribution device having a built-in switching device for interrupting a primary current of an ignition coil,
The rotation angle detection device and the switching device constitute an integrated electronic circuit unit, wherein an iron core of the ignition coil is provided close to the shaft, and the iron core comprises a ball bearing supporting the rotary plate and the shaft. A power distribution unit for an internal combustion engine, wherein the power distribution unit is located between the power supply units and an output tower of the ignition coil is inclined outward with respect to a rotating shaft. 7. The rotation angle detecting device according to claim 6, wherein the rotation angle detection device is incorporated in a substantially fan-shaped resin case, and the ignition coil and the resin case are substantially 180 degrees apart from each other with a rotation shaft interposed therebetween.
And a power tower for the internal combustion engine, wherein the power tower of the ignition coil is inclined away from the resin case. 8. The ignition coil according to claim 6, wherein the core of the ignition coil is a U-shaped core that is positioned substantially perpendicular to the rotating shaft and substantially parallel to the bottom of the power distributor. For an internal combustion engine. 9. A power distribution device for an internal combustion engine according to claim 6, wherein the high-voltage wiring of the ignition coil extends to the center electrode at an angle along the inclination of the power distribution device cap. 10. A shaft that rotates in synchronization with a crankshaft of an engine, a rotating plate that rotates integrally with the shaft and has a predetermined slit, a photoelectric pickup that detects a signal by rotation of the rotating plate, and the pickup. A control circuit that amplifies the signal of the rotation angle detection device assembly including a synthetic resin case that houses the photoelectric pickup unit and the control circuit unit, wherein the synthetic resin case has a fan shape or a semicircle, A two-story structure having the control circuit in the synthetic resin case, a photoelectric pickup formed in a part of the case on the control circuit, and a heat sink to which the control circuit is attached; It is attached to the lower part of the synthetic resin case with the control circuit inside so that the back surface is the bottom surface of the synthetic resin case. An opening for joining the lead frame of the control circuit to the input / output lead wire of the photoelectric pickup and an opening for joining the input / output lead frame of the control circuit to the terminal of the external connector are provided on the upper surface of the synthetic resin case. A power distribution device for an internal combustion engine, comprising: a cover for closing the opening.