JPH0633860A - Revolution crank angle detection device - Google Patents

Abstract

PURPOSE:To obtain a revolution crank angle detection device which has a simple structure and can improve the productivity and reduce the cost. CONSTITUTION:A first accommodation chamber 12 for accommodating a light receiving element 4 and a circuit base board 7 is formed on the upper surface side of a housing 5, and the second accommodation chamber 13 for accommodating a luminous element 3 is formed on the undersurface side. Further, an insertion electrode 14 is insertion-molded so that one edge is exposed to the first accommodation chamber 12 and the other edge is exposed to the second accommodation chamber 13. The lead terminal of the luminous element 3 and the lead frame 8 of a circuit base board 7 and subjected to parallel-gap-welded to the insertion electrode 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary crank angle detecting device for detecting a rotary angle of an engine crankshaft.

[0002]

2. Description of the Related Art Conventionally, control of ignition timing of an engine is performed by detecting a rotation angle of a crankshaft. This type of rotary crank angle detector is a device attached to the engine, and is used in a harsh environment where harmful gas is generated and heat shock at high temperature and low temperature is applied. Sex is required.

FIG. 2 is a sectional view showing an example of a conventional rotary crank angle detecting device. In the figure, 1 is a distributor shaft that rotates in synchronization with a camshaft, and 2 is a shaft 1.
The disk 2a fixed to the disk 2 is a slit provided on the outer peripheral portion of the disk 2. Reference numeral 5 denotes a housing. The housing 5 is incorporated in a power distributor, and holds the light emitting element 3 and the light receiving element 4 facing each other with the disk 2 interposed therebetween. 6
Is an insert electrode that is provided in the housing 5 and electrically connects the light emitting element 3 and the light receiving element 4 to the circuit board 7. The circuit board 7 has an output signal of the power supply circuit section of the light emitting element 3 and the light receiving element 4. And the waveform processing unit of.
Reference numeral 8 is a lead frame for electrically connecting the circuit board 7 and external terminals, and reference numerals 9, 10, 11 are covers.

Here, in the above-described rotary crank angle detecting device, since the housing portion of the light emitting element 3 and the welding portion of the insert electrode 6 for connecting to the circuit board 7 are separate spaces, the light emitting element 3 emits light. A through hole is provided through the housing portion of the element 3 and the welded portion of the insert electrode 6, and the lead terminal of the light emitting element 3 formed of a Kovar gold-plated wire is lead-formed in a U-shape, and then the lead terminal is formed in the through hole. The lead terminal and the insert electrode 6 are resistance-welded through.

Further, the circuit board 7 is attached to the housing 5, the light emitting element 3 and the light receiving element 4 are adhesively fixed to the housing 5, and then sealed by the covers 9, 10, 11 to form a circuit element, a terminal portion, etc. Has a structure that is shielded from harmful gas.

Further, the light emitting element 3 and the light receiving element 4 are electrically connected to the circuit board 7 via the insert electrode 6, and even if a heat shock is applied, the light emitting element 3 and the light receiving element are received by using the through holes. It is possible to suppress the occurrence of solder cracks which are caused by stress stress concentrated on the joint portion when the element 4 and the circuit board 7 are directly connected.

Next, the operation of the conventional rotary crank angle detecting device will be described. When the shaft 1 rotates in synchronization with the cam shaft, the disc 2 rotates. With the rotation of the disk 2, the slit 2a passes between the light-emitting element 3 and the light-receiving element 4 which are arranged to face each other,
The light emitted from the light emitting element 3 is blocked / passed. Light receiving element 4
Then, the light emitted from the light emitting element 3 is received and output to the circuit board 7 via the insert electrode 6. In the circuit board 7,
The output of the light receiving element 4 is waveform-shaped by the comparator to convert the impedance, and the pulse signal is output to the external terminal via the lead frame 8.

Further, the camshaft rotates at a predetermined ratio with respect to the rotation of the crankshaft, and by counting this pulse signal, the crank angle can be detected and the ignition timing of the engine can be controlled.

[0009]

As described above, in the conventional rotary crank angle detecting device, the lead terminal of the light emitting element 3 is lead-formed into a complicated shape, and the insert electrode 6 is inserted through the through hole provided in the housing 5. Since it is resistance-welded, it is not suitable for line automation, and the lead length becomes long and the shape after forming is not stable,
There is a problem that the workability is lowered and the Kovar gold-plated wire is expensive, so that the productivity is lowered and the cost is increased.

There is also a problem that a space for welding the lead terminal of the light emitting element 3 and the insert electrode 6 is required, and a cover sealing step is required because the space is required to be sealed.

The present invention has been made to solve the above problems, and an object thereof is to obtain a rotary crank angle detecting device having a simple structure which can improve productivity and reduce cost.

[0012]

A rotary crank angle detecting device according to the present invention is a rotary crank angle detecting device having a light emitting element, a light receiving element and a power supply circuit board in a housing, wherein the power supply circuit board is provided on an upper surface side of the housing. Is provided, and a second storage chamber for housing the light emitting element is provided on the lower surface side of the housing, one end of which is exposed to the first storage chamber and the other end of which is the second storage chamber. Insert molding insert electrode into the housing so that it is exposed,
One end of the insert electrode is welded to the power circuit board and the other end is welded to the light emitting element by parallel gap welding.

[0013]

In the present invention, since the insert electrode is provided in the housing so that one end is exposed in the first storage chamber and the other end is exposed in the second storage chamber, the length of the lead terminal of the light emitting element is increased. Is shorter, lead forming can be performed easily, the lead shape after forming is stable, suitable for line automation, and cost reduction can be achieved. Also,
Since the insert electrode, the light emitting element, and the circuit board are parallel-gap welded, the height of the welded portion is reduced, and the overall height of the module is shortened.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional view of a rotary crank angle detecting device according to an embodiment of the present invention. In the drawing, the same or corresponding parts as those of the conventional rotary crank angle detecting device shown in FIG. The description is omitted. In the figure, 1
Reference numeral 2 is a first storage chamber for storing the light receiving element 4 and the circuit board 7, 13 is a second storage chamber for storing the light emitting element 3, and 14 is an insert electrode for connecting the light emitting element 4 and the circuit board 7.

Now, the structure of the rotary crank angle detecting device according to the above embodiment will be described. First, in the first storage chamber 12, the light receiving element 4 is adhesively fixed, and further, the circuit board 7 is adhesively fixed to the lower surface of the light receiving element 4 with a predetermined gap. On the other hand, the light emitting element 3 is adhesively fixed to the second storage chamber 13. Further, the insert electrode 14 is insert-molded so that both ends thereof are located at substantially the same surface positions as the terminal surface of the light emitting element 3 and the input / output terminal surface of the circuit board 7. The lead terminal of the light emitting element 4 is bent in the horizontal direction, is parallel gap welded to one end of the insert electrode 14, and is electrically and mechanically connected. Further, the lead frame 8 of the circuit board 7 is parallel-gap welded to the other end of the insert electrode 14 to be electrically and mechanically connected, and the covers 9 and 10 are used to form the first storage chamber 12.
And the second storage chamber 13 is completely sealed. In addition,
The lead terminal of the light receiving element 4 is also connected to the circuit board 7 via the insert electrode, and the connection portion is welded in parallel gap.

The operation of the above embodiment operates in the same manner as the conventional rotary crank angle detecting device.

As described above, according to the above-described embodiment, the lead forming of the lead terminal of the light emitting element 3 only needs to be bent once in the horizontal direction, the forming is simple, and the welded portion with the insert electrode 14 is near the element. Therefore, the length of the lead terminal of the light emitting element 3 is shortened, the shape after forming is stable, the work of passing the lead terminal through the through hole is eliminated, the automation of the line is facilitated, the productivity is improved, and the cost is reduced. It can be reduced.

Further, since the connection portion is parallel gap welded, the height of the welded portion is reduced, and the overall height of the module can be shortened.

Further, like the conventional rotary crank angle detecting device, since the light emitting element 3, the light receiving element 4, the circuit board 7 and the terminal portion are completely sealed, gas resistance is obtained and the light emitting element is obtained. 3 and light receiving element 4 and circuit board 7
Since and are electrically connected via the insert electrode,
Heat shock resistance can be obtained.

[0020]

As described above, according to the present invention, the first storage chamber for storing the power supply circuit board is provided on the upper surface side of the housing, and the second storage chamber for storing the light emitting element is provided on the lower surface side of the housing. The insert electrode is insert-molded in the housing so that one end is exposed to the first storage chamber and the other end is exposed to the second storage chamber, and one end of the insert electrode is a power circuit board and the other end emits light. Since the parallel gap welding is performed with the element, there is an effect that productivity can be improved and a rotary crank angle detection device having a simple structure that can reduce cost can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary crank angle detection device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional rotary crank angle detection device.

[Explanation of symbols]

 3 Light emitting element 4 Light receiving element 5 Housing 7 Circuit board 12 First storage chamber 13 Second storage chamber 14 Insert electrode

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[Procedure amendment]

[Submission date] November 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, control of ignition timing of an engine is performed by detecting a rotation angle of a crankshaft. This type of rotary crank angle detection device is a device attached to the engine, and because it is used in a harsh environment where harmful gas is generated and heat shock at high temperature and low temperature is applied, And heat shock resistance are required.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

Means for Solving the Problems] rotation crank angle detecting apparatus according to the present invention, the light-emitting element in the housing, the rotation crank angle detecting apparatus provided with a light receiving element, and a power supply circuit board, the power supply circuit under surface side of the housing a first housing chamber for housing the substrate provided, provided with a second storage chamber for accommodating the light emitting element to the upper surface side of the housing, one end is exposed to the first storage chamber, the other end a second housing Insert molding the insert electrode into the housing so that it is exposed to the chamber,
One end of the insert electrode is welded to the power circuit board and the other end is welded to the light emitting element by parallel gap welding.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

According to the present invention as described above, according to the present invention, the first housing chamber for accommodating the power supply circuit board under surface side of the housing is provided, a second housing for housing the light emitting element to the upper surface side of the housing The insert electrode is insert-molded in the housing so that one end is exposed to the first storage chamber and the other end is exposed to the second storage chamber while the chamber is provided, and one end of the insert electrode is connected to the power circuit board and the other end. Since parallel gap welding is performed with the light emitting element, there is an effect that productivity can be improved and a rotary crank angle detection device having a simple structure that can reduce cost can be obtained.

Claims (1)

[Claims] 1. A rotary crank angle detecting device comprising a light emitting element, a light receiving element and a power circuit board in a housing, wherein a first storage chamber for housing the power circuit board is provided on an upper surface side of the housing, and the housing is provided. A second storage chamber for storing the light emitting element is provided on the lower surface side of the first storage chamber, one end of the second storage chamber is exposed to the first storage chamber, and the other end is connected to the second storage chamber.
A rotary crank angle detection, wherein an insert electrode is insert-molded in the housing so as to be exposed in the housing chamber, and one end of the insert electrode is parallel-gap welded to the power supply circuit board and the other end to the light emitting element. apparatus.