JP2837998B2 - Rotary crank angle detector - Google Patents

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 rotational angle of a crank shaft of an engine.

[0002]

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

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

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

Further, the circuit board 7 is mounted on the housing 5, the light emitting element 3 and the light receiving element 4 are adhered and fixed to the housing 5, and then sealed with covers 9, 10, and 11. Are shielded from harmful gases.

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, so that even if a heat shock is applied, the light emitting element 3 and the light receiving When the element 4 and the circuit board 7 are directly connected, the occurrence of solder cracks, such as the concentration of stress at the joint, is suppressed.

Next, the operation of the conventional rotary crank angle detecting device will be described. When the shaft 1 rotates in synchronization with the camshaft, the disk 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 opposite to each other,
The light emitted from the light emitting element 3 is blocked / passed. Light receiving element 4
Then, light emitted from the light emitting element 3 is received and output to the circuit board 7 via the insert electrode 6. On the circuit board 7,
The output of the light receiving element 4 is waveform-shaped by a comparator, impedance is converted, and a pulse signal is output to an external terminal via the lead frame 8.

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

[0009]

As described above, the conventional rotary crank angle detecting device performs lead forming of the lead terminal of the light emitting element 3 into a complicated shape and passes through the insert electrode 6 through the through hole provided in the housing 5 as described above. Is not suitable for automation of the line, and the lead length is long and the shape after forming is not stable.
There is a problem that the workability is reduced, and the Kovar gold-plated wire is expensive, and the productivity is reduced 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 step of sealing the cover is required because this space must be sealed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating crank angle detecting device having a simple structure capable of improving productivity and reducing costs.

[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 the insert electrode into the housing to be exposed in the chamber,
One end of the insert electrode is welded to the power supply circuit board, and the other end is welded to the light emitting element by parallel gap welding.

[0013]

According to the present invention, the insert electrode is provided in the housing such that one end is exposed to the first storage chamber and the other end is exposed to the second storage chamber. , Lead forming can be easily performed, 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 reduced.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a sectional view of a rotary crank angle detecting device showing one embodiment of the present invention. In the figure, the same or corresponding parts as those of the conventional rotary crank angle detecting device shown in FIG. Description is omitted. In the figure, 1
Reference numeral 2 denotes a first storage chamber for storing the light receiving element 4 and the circuit board 7, reference numeral 13 denotes a second storage chamber for storing the light emitting element 3, and reference numeral 14 denotes an insert electrode for connecting the light emitting element 4 and the circuit board 7.

Here, the structure of the rotary crank angle detecting device according to the above embodiment will be described. First, the light receiving element 4 is bonded and fixed to the first storage chamber 12, and the circuit board 7 is bonded and 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 bonded and fixed to the second storage chamber 13. Further, the insert electrode 14 is insert-molded such that both end portions thereof are located substantially at the same surface position as the terminal surface of the light emitting element 3 and the input / output terminal surface of the circuit board 7. The lead terminals of the light emitting element 4 are bent in the horizontal direction, are welded in parallel with one end of the insert electrode 14, and are 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 and is electrically and mechanically connected.
And the second storage chamber 13 is completely sealed. In addition,
The lead terminals of the light receiving element 4 are also connected to the circuit board 7 via the insert electrodes, and the connection portions are parallel gap welded.

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 simplified, and the welded portion with the insert electrode 14 is located near the element. Therefore, the length of the lead terminal of the light emitting element 3 is shortened, the shape after forming is stabilized, 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. Can be reduced.

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

Further, similarly to the conventional rotary crank angle detecting device, the light emitting element 3, the light receiving element 4, the circuit board 7, and the terminals are completely sealed, so that gas resistance can be obtained and the light emitting element can be obtained. 3 and light receiving element 4 and circuit board 7
And are electrically connected via the insert electrode,
Heat shock resistance is obtained.

[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 A chamber is provided, and an insert electrode is insert-molded in the housing such 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 connected to the power supply circuit board and the other end. Is welded in parallel gap with the light emitting element, so that the productivity is improved and the rotary crank angle detecting device having a simple structure capable of reducing the cost is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rotary crank angle detecting device according to an embodiment of the present invention.

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

[Explanation of symbols]

 Reference Signs List 3 light emitting element 4 light receiving element 5 housing 7 circuit board 12 first storage room 13 second storage room 14 insert electrode

Claims (1)

(57) [Claims] 1. A light-emitting element in the housing, the rotation crank angle detecting apparatus provided with a light receiving element, and a power supply circuit board is provided with a first housing chamber for accommodating the power supply circuit board under surface side of the housing, wherein 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 housing chamber, the other end second
Wherein an insert electrode is insert-molded in the housing so as to be exposed in the storage 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.