JPH01300065A - Photoelectric signal generator - Google Patents

Abstract

PURPOSE:To facilitate assembling by forming a sensor unit in a size by which it can be inserted between a housing and a shutter, assembling the shutter with a rotary shaft, thereafter assembling the unit in the housing. CONSTITUTION:A photoelectric signal generator 3 composing a distributor 1 together with a distribution part 2 is housed in a housing 7. The generator 3 is composed of a shutter 12 fixed vertically to a rotary shaft 4 and a sensor unit 15 having photo-emitting and -recepting elements 13, 14 sandwiching the shutter while being in opposition to each other. In this case, a lower case 17 including the element 13 in a sensor case 18 is formed in a size by which it can be inserted between the housing 7 and the shutter 12 when the unit 15 is assembled in the housing 7. After the shutter 12 is assembled to the rotary shaft 4, the unit 15 is assembled in the housing 7. It is thus possible to facilitate the assembling of a photoelectric type signal generator 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photoelectric signal generator suitable for use when incorporated into an ignition power distribution device for an internal combustion engine to detect the rotational speed and crank angle of the internal combustion engine. .

[Prior Art] A signal generator is built into an ignition power distributor for an internal combustion engine, and detects the rotational speed and crank angle of the internal combustion engine to generate an ignition signal to determine the ignition timing of the ignition plug. There is a photoelectric signal generating device that includes a formed shutter and a sensor unit that includes a light emitting element and a light receiving element.

A conventional example in which such a photoelectric signal generating device is incorporated into a power distributor will be described with reference to FIG. 6.

Note that FIG. 6 is a cross-sectional view of an ignition distributor for an internal combustion engine incorporating a photoelectric signal generator.

The photoelectric signal generator 100 has a rotating shaft 1 of a power distributor 101.
A disc-shaped shutter 103 installed orthogonally to 02
and a sensor unit 108, which includes a light emitting element 104 and a light receiving element 105, which are disposed facing each other in the axial direction with the shutter 103 in between, and a mounting part 107 to the housing 106 of the power distributor 101 is formed in an annular shape. .

When assembling the photoelectric signal generator 100 into the housing 106, first, the sensor unit 108 is inserted into the housing 106 from above the rotating shaft 102 rotatably attached to the housing 106 and fixed therein.

After that, the disk-shaped shutter 103 is attached to the sensor unit 1.
A sleeve 110 is fixed to the end of the rotating shaft 102 while inserting the outer peripheral part of the shutter 103 into the gap 109 formed between the light emitting element 104 and the light receiving element 105 of 08, and a sleeve 112 to which the power distribution rotor 111 is attached. After the shutter 103 is positioned, the sleeve 112 is fixed to the rotating shaft 102 with screws 113 and attached.

[Problems to be Solved by the Invention] However, in the power distributor 101 incorporating the photoelectric signal generating device 100 described above, since the mounting portion 107 of the sensor unit 108 is formed in an annular shape, the housing 106
After assembling the sensor unit 108 inside the shutter 1
03 is attached to the rotating shaft 102. Therefore,
Positioning of the shutter 103 within the narrow housing 106 and rotation axis 1 via the sleeve 110 and sleeve 112
02, and it is difficult to assemble the photoelectric signal generator 100 into the housing 106.

Also, when replacing only the sensor unit 108,
It was necessary to remove the shutter 103, the sleeve 110, and the sleeve 112 from the rotating shaft 102, making it difficult to replace the sensor unit 108 easily.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a photoelectric signal generating device that can be easily assembled into a housing.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a rotating shaft to which rotation of a rotating device is transmitted, and a rotating shaft fixed orthogonally to the rotating shaft,
A light-emitting element has a disc-shaped shutter in which a plurality of slits are formed, an insertion port into which the shutter is inserted, and is arranged to face each other in the axial direction with the shutter inserted into the insertion port. and a light-receiving element, the sensor unit includes a sensor unit that converts light from the light-emitting element into an electrical signal by the light-receiving element, and a housing that rotatably supports the rotating shaft and includes the shutter and the sensor unit. In a photoelectric signal generator that
The sensor unit is formed in a size such that it can be inserted between the outer peripheral part of the shutter, which has at least the bottom side of the insertion port fixed to the front rotation shaft, and the inner peripheral wall surface of the housing, and the sensor unit is inserted into the housing. After being inserted into the housing, the technical means is to move the insertion port in the radial direction so as to insert it into the shutter and assemble it into the housing.

[For fv] In the present invention having the above configuration, the bottom side of the sensor unit from the insertion opening into which the shutter is inserted is formed in a size that can be inserted between the outer peripheral part of the shutter and the inner peripheral wall surface of the housing. .

Therefore, the sensor unit is inserted into the housing by passing the bottom side of the insertion port between the outer circumference of the shutter attached to the rotating shaft and the inner peripheral wall of the housing, and then inserting the shutter into the insertion port of the sensor unit. radially so that the Then, the sensor unit is fixed in the housing at a position corresponding to the slit of the shutter in which the light emitting/light-emitting element and the light-receiving element rotate together with the rotating shaft.

[Effects of the Invention] In this way, in the present invention, after the shutter is fixed to the rotating shaft and installed in the housing, the sensor unit can be inserted into the housing and fixed, so that it is possible to insert the sensor unit into the housing and fix it in the housing. There is no need to perform complicated operations such as positioning the shirt shirt and fitting it onto the rotating shaft via the sleeve, and the photoelectric signal generator can be easily assembled into the housing.

Further, even when only the sensor unit is replaced, there is no need to remove the shutter or sleeve from the rotating shaft, and the sensor unit can be replaced easily.

[Embodiment] Next, an embodiment in which the photoelectric signal generating device of the present invention is incorporated into an ignition distributor for an internal combustion engine will be described based on the drawings.

FIG. 1 is an explanatory diagram of the assembly of a photoelectric signal generator, and FIG. 2 is a sectional view of an ignition distributor for an internal combustion engine.

Ignition power distribution device for internal combustion engine of this embodiment (hereinafter referred to as power distribution device)
1, as shown in FIG. 2, a power distribution unit 2 for distributing high voltage to spark plugs (not shown) at ignition timing in a certain order; ); and a photoelectric signal generator that detects the rotational speed and crank position of the engine and generates a signal for determining the ignition timing.

The power distribution unit 2 includes a power distribution rotor 5 attached to an end (left side in FIG. 2) of a rotating shaft 4 that is drive-coupled to the output shaft of the internal combustion engine and rotates in synchronization with the output shaft, and a power distribution rotor 5 that is attached to the end (left side in FIG. 2). It also includes a plastic power distribution cap 6 to which a high voltage cord (not shown) is connected from the outside.

The power distribution cap 6 constitutes the outer shell of the power distributor 1 together with a housing 7 to be described later, and after being fitted into the housing 7, the power distribution cap 6 is tightened and fixed with bolts 8.

The power distribution cap 6 is provided with a center electrode 9 connected to an ignition coil (not shown) through a high-voltage cord in the center thereof, and side electrodes 10 in number corresponding to the number of cylinders of the internal combustion engine are provided in the periphery. A power distribution brush 11 is provided inside the center electrode 9, and is in sliding contact with the band-shaped rotor electrode 5a fixed to the end surface of the power distribution rotor 5 (III on the left in FIG. 2). When the power distribution rotor 5 rotates together with the rotating shaft 4, there is approximately 0.8n between the tip of the rotor electrode 58 and the side electrode 10.
A high voltage is generated at the moment the tip of the rotor electrode i5a faces the side electrode 10.

The photoelectric signal generator 3 includes a shutter 12 which is enclosed in the housing 7 described above and has a plurality of transparent windows (slits according to the present invention) 12a formed in a thin metal disc fixed perpendicularly to the rotating shaft 4; Light-emitting diodes (light-emitting elements of the present invention) 13 are arranged facing each other in the axial direction with the shutter 12 in between.
and a sensor unit 15 including a phototransistor (light receiving element of the present invention) 14.

Note that, since a phototransistor path (not shown), which is a light receiving element, is integrated with -m, the size of the case containing the phototransistor 14 and the processing circuit becomes large. Therefore, in this embodiment, the light emitting diode 13 is placed on the bottom surface of the housing 7 with the shutter 12 in between. ! ! I
(on the right side of FIG. 2), and the phor 1-transistor 14 is arranged on the power distribution section 2 side (on the left side of FIG. 2).

The rotating shaft 4 is a part that fixes the shutter 12 and is a rotating shaft 4a.
and a rotating shaft 4b, and the shutter 1
A rotary shaft 4a and a rotary shaft 4b are assembled by press fitting with the rotary shaft 2 in between. Therefore, the shutter 12 is assembled integrally with the rotating shaft 4 before the rotating shaft 4 is attached to the housing 7.

The shutter 12 rotates in an extremely narrow gap formed in the axial direction between the light emitting diode 13 and the phototransistor 14, and allows the light from the light emitting diode 13 to be transmitted and blocked by the light transmitting window 12a.

The sensor unit 15 receives light from the light emitting diode 13 with a phototransistor 14 and converts it into an electrical signal. Therefore, when the shutter 12 rotates together with the rotation shaft 4, the photoelectric signal generating device 3 consisting of the shutter 12 and the sensor unit 15 converts the light passing through the light-emitting diode 13 that has passed through the light-transmitting window 12a into electricity using the phototransistor 14. An engine control computer (not shown, hereinafter referred to as FC) converts the internal combustion engine's rotational speed signal and crank position signal into signals and controls the operating state of the internal combustion engine.
(abbreviated as C).

As shown in FIGS. 3 to 5, the sensor unit 15 includes an upper case 1G containing a phototransistor 14.
and a lower case 17 containing a light emitting diode 13, and a slit-shaped insertion opening 18a for inserting the shutter 12 between the negative side case 16 and the lower case 17. is formed.

3 is a plan view of the photoelectric signal generating device 3, FIG. 4 is a side view of the photoelectric signal generating device 3, and FIG. 5 is a bottom view of the photoelectric signal generating bag N3.

As shown in FIG. 4, the upper case 16 has a predetermined height 111 that can contain the phototransistor 14, and its planar shape is approximately arcuate as shown in FIG. A lead wire 19 for electrically connecting the sensor unit 15 to the ECC is connected to one end 16a of the upper case 16. Further, the inner wall surface 16b of the upper case 16 on the rotating shaft 4 side is formed in a semicircular concave shape corresponding to the outer peripheral surface of the rotating shaft 4.

As shown in FIG. 4, the lower case 17 has a predetermined height l+2 that can contain the light emitting diode 13, and the height (height from the bottom of the lower case 17 to the insertion port) h2 is: The mounting height of the shutter 12 from the bottom surface of the housing 7 is equal to the height thereof, and its planar shape is approximately arcuate like the upper case 16, as shown in FIG.

Both ends of the lower case 17 are provided with mounting portions 17 for fixing the sensor unit 15 to a predetermined location on the bottom surface of the housing 7.
Mounting hole 1 for fixing with screws, configured as a.
7b is formed. Also, the rotating shaft 4 of the lower case 17
The side inner wall surface 17c is formed in a semicircular concave shape corresponding to the outer peripheral shape of the shutter 12.

Furthermore, the lower case 17 is formed in a size that allows it to be inserted between the outer circumferential portion of the shutter 12 and the inner circumferential wall surface of the housing 7 when the sensor unit 15 is assembled into the housing 7 . Therefore, as shown in FIG. 1, the radial dimension X of the lower case 17 is smaller than the distance Y between the outer peripheral portion of the shutter 12 and the inner peripheral wall surface of the housing 7.

The sensor unit 15 includes the sensor case 18 made up of the upper case 16 and the lower case 17 as described above.The sensor unit 15 is inserted into the housing 7 so that the bottom surface of the lower case 17 touches the bottom surface inside the housing 7. When I came into contact with
The position of the insertion port 18a of the sensor unit 15 from the bottom surface of the housing 7 is fixed to the rotating shaft 4 and is provided so as to match the position of the shutter 12.

The housing 7 rotatably supports the rotary shaft 4 via a cylindrical portion 7 a containing the photoelectric signal generator 3 and a bearing 20 , and allows gear oil, engine oil, etc. to be leaked from the outside of the housing 7 to the inside of the power distribution device 1 . The cylindrical bearing part 7b is provided with an oil seal 21 to prevent oil from entering the cylinder.

At the bottom of the housing 7, a screw hole 7C for assembling the sensor unit 15 is connected to the mounting hole 17b of the lower case 17.
It is formed to match. This screw hole 7C is
The screw holes 7C are located at opposite positions with respect to the rotating shaft 4, and the interval G between the screw holes 7C is larger than the outer diameter I of the shutter 12.

Next, the assembly of the photoelectric signal generator 3 into the housing 7 will be explained.

First, the rotating shaft 4a and the rotating shaft 4b are press-fitted and fixed with the shutter 12 in between, and after the rotating shaft 4 and the shutter 12 are integrally assembled, the rotating shaft 4 can be rotated into the housing 7 via the bearing 20. Attach to.

Thereafter, the sensor unit 15 is inserted into the housing 7 from above the housing 7 along the rotation axis 4, and the lower case 15, which is on the bottom side of the insertion port 18a of the sensor unit 15,
7 is passed between the outer peripheral part of the shutter 12 and the inner peripheral wall surface of the housing 7, and the bottom surface of the lower case 17 is inserted into the housing 7.
Make it come into contact with the bottom of the inside.

Next, slide the sensor unit 15 toward the rotating shaft 4 so as to insert the shutter 12 into the insertion port 18a (slide the sensor unit 15 from the position shown by the solid line in FIG. 1 to the position shown by the two-dot chain line). Then, the mounting hole 17b formed in the mounting portion 17a of the lower case 17 is aligned with the screw hole IC formed in the housing 7, and fixed with a screw (not shown).

As a result of the above, the shutter 12. The assembly of the photoelectric signal generator 3 consisting of the and sensor unit 15 into the housing 7 is completed.

As described above, in the present invention, the sensor units 1 to 15 are attached to the housing 7 after the shutter 12 is assembled to the rotating shaft 4.
Since it can be assembled into the photoelectric signal generator, there is no need to perform complicated operations such as positioning the shutter 12 within the narrow housing 7 and attaching it to the rotating shaft 4 via a sleeve, as in the conventional case. 3 can be easily assembled into the housing 7.

Further, even when only the sensor unit 15 is replaced, the work of removing the shutter 12 and the sleeve from the rotating shaft 4 is not long, and the work of replacing the sensor unit 15 can be easily performed.

When assembling the shutter 12 to the rotary shaft 4 after the rotary shaft 4 is attached to the housing 7 as in the past, an error occurs in assembling the shutter 12 to the rotary shaft 4, so there is a method to absorb this error. In addition, it is necessary to increase the distance between each electrode of the power distribution section 2, and the outer shape of the power distribution section 2 is formed to be large. However, when the shutter 123 is assembled to the rotating shaft 4 at the same time as in this embodiment, the error in assembling the shutter 12 to the rotating shaft 4 can be reduced, and therefore, There is no need to make the outer shape of the power distribution section 2 larger than necessary, and a compact power distribution section 2 can be provided.

(Modification) In this embodiment, a case where the photoelectric signal generator 3 is incorporated into the ignition power distribution device 1 for an internal combustion engine is illustrated, but it is also possible to incorporate only the photoelectric signal generator 3 independently into the housing. .

The photoelectric signal generator 3 may be applied to a flowmeter for electricity, gas, water, etc., and assembled into its housing.

Since the phototransistor 14, which is a light-receiving element, and the processing circuit are housed together, the size of the case on the phototransistor 14 side becomes large. Although the case where the phototransistor 14 is arranged on the power distribution section 2 side is illustrated in FIG. The light emitting diode 13, which is a light emitting element, is placed on the power distribution unit 2 side, and the photo 1 to transistor 14, which are light receiving elements, are placed on the side of the power distribution unit 2.
may be placed on the bottom side of the housing 7.

Mounting part 17a of sensor unit 15 into housing 7
Although the mounting holes 17b are formed at both ends of the lower case 17, the position of the mounting portion 17a, the number of mounting holes 17b, etc.
There is no need to be limited to the cases illustrated in the examples.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the assembly of the photoelectric signal generator S, Figure 2 is a sectional view of the ignition distributor for internal combustion engines, Figure 3 is a plan view of the photoelectric signal generator, and Figure 4 is the photoelectric type. FIG. 5 is a side view of the signal generator, FIG. 5 is a bottom view of the photoelectric signal generator, and FIG. 6 is a sectional view of an ignition distributor for an internal combustion engine showing an example of the prior art. In the figure 3...Photoelectric signal generator 4...Rotating shaft 7
...Housing 12...Shutter 12a...
Translucent window (slit) 13... Light emitting diode (
Light emitting element) 14... Pho 1 ~ transistor (light receiving element)
15...Sensor unit I-188...Inlet

Claims (1)

[Scope of Claims] 1) A rotating shaft through which the rotation of a rotating device is transmitted; a disc-shaped shutter fixed orthogonally to the rotating shaft and having a plurality of slits formed therein; and a gap into which the shutter is inserted. Along with having an entrance,
a sensor unit comprising a light-emitting element and a light-receiving element arranged axially opposite to each other with the shutter inserted into the insertion port, the light-receiving element converting light from the light-emitting element into an electrical signal; In the photoelectric signal generating device, the photoelectric signal generating device includes a housing that rotatably supports the rotating shaft and includes the shutter and the sensor unit, wherein the sensor unit is fixed to the rotating shaft at least at a bottom side from the insertion port. The sensor unit is formed in a size that can be inserted between the outer peripheral part of the shutter and the inner peripheral wall surface of the housing, and the insertion port is inserted into the shutter after the sensor unit is inserted into the housing. A photoelectric signal generator, wherein the photoelectric signal generator is assembled into the housing by moving the device in a radial direction.