JPS63263271A - Photoelectric rotation detector - Google Patents

Abstract

PURPOSE:To facilitate replacing work of sensor unit by moving the sensor unit in the direction of a rotary shaft along base section of a fixing member, then inserting a disc into an insertion port and fastening through a fastener. CONSTITUTION:An ignition distributor A in an igniter for internal-combustion engine comprises a distributing section 1 and a photoelectric rotation detector 2. The photoelectric rotation detector 2 comprises a fixing metal 3, a rotor shaft 4, a disc 7, a mounting tool 6, a sensor unit 7 and a fastener 9. The sensor unit 5 is moved in the direction of a rotor shaft 4 along the base section 33 of the fixing metal 3 so as to insert the disc 5 into an insertion port 75a thus fastening with a fastener 9. Consequently, replacing work of the sensor unit 7 is facilitated.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a photoelectric rotation detection Vl arrangement, and in particular to a photoelectric rotation detection system that is most suitable for use in rotation angle sensing for detecting the crank angle of an internal combustion engine. Regarding the detection device.

[Prior Art] As shown in FIG. 6, an ignition power distribution device 20G for an internal combustion engine in which this type of photoelectric rotation detection device [1GG is assembled] has a rotating shaft 110 connected to a crankshaft of an internal combustion engine, A sleeve 121 fixed to the shaft 11G and the sleeve 1
21 and a sleeve 122, a disk 130 around which a number of transparent windows (not shown) are provided, and a sensor unit 1.
4G, the cylindrical part 151 inserted into the internal combustion Il section, and the annular MI! The housing 150 includes a portion A 152 and a side wall portion 153.

Furthermore, the sensor unit 140 includes a light emitting element 141 and a light receiving element 1 which are arranged oppositely above and below the transparent window of the disk 130.
42, hybrid integrated circuit 143, connector, 144
, and a sensor case 145 incorporating these into one body.
Consisting of This sensor case 145 includes a light emitting element 141
, the structure of the light receiving element 142, the hybrid integrated circuit 143, and the connector 144, and the position of the screw hole 146 for fastening the housing 150 to the base 152, the housing 150 is formed into an annular shape as shown in FIG. (Japanese Unexamined Patent Publication No. 59-185876, etc.).

[Problems to be Solved by the Invention] When assembling the conventional photoelectric rotation detection device 100 having the above configuration into the housing 15G, first the rotating shaft 110 is rotatably attached to the base portion 152 of the housing 1500, and then the rotating shaft 11G is attached to the base portion 152 of the housing 1500. Moving the sensor unit 14G along the rotation axis 110 from above in the drawing so that the rotation axis 110 is inserted into the insertion hole 147 of the sensor case 145,
It is fastened to the base part 152. Thereafter, the sleeve 121 is fixed to the rotating shaft 110 so that the sleeve 121 is located between the rotating shaft 110 and the sensor unit 140.

Then, while inserting the disc 130 into the insertion port 14B of the sensor case 145 (the gap between the light emitting element 141 and the light receiving element 142), the positioning pin 123 of the sleeve 121 and the disc 13 are inserted.
After aligning the positioning holes 131 of Since the housing 150 having the section 153 was used, the installation work was difficult.

Further, in the conventional photoelectric rotation detection device 100, after the disk 13G is attached, light emitting elements 14 are arranged above and below the disk 130.
1 and the light receiving element 142 are difficult to face,
Even if only the sensor unit 140 is replaced, the disk 13
0 and the sleeves 121, 122 had to be removed from the rotating shaft 110, making replacement work difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a photoelectric rotation detection device in which the ease of assembling a sensor unit to a mounting member is improved and the sensor unit can be easily replaced.

[Means for solving the problems] In order to achieve the above object, the photoelectric rotation detection device of the present invention has the following features:
A rotating shaft connected to a rotating device, a mounting member rotatably supporting the rotating shaft and having an annular base xPIA, and a disc fixed orthogonally to the rotating shaft and provided with a transparent window. and a light-emitting element and a light-receiving element arranged to face each other above and below the transparent window in a non-closed annular sensor case having a slit-shaped insertion opening into which the disc is inserted. a sensor unit that is assembled into one body and fastened to a base portion of the mounting member, the sensor unit:
The disc is moved along the base of the mounting member in the direction of the rotation axis, inserted into the insertion opening, and fastened with a fastener.

[Function and Effects of the Invention fA] With the above configuration, the photoelectric rotation detection device of the present invention has the following function and effect.

The photoelectric rotation detection device of the present invention moves the sensor unit along the M plate portion of the mounting member in the direction of the rotation axis,
Since the disc is inserted into the insertion hole and fastened with the V1 fastener,
It becomes easy to make the sensor units face each other after attaching the disk. Further, since there is no need to perform complicated work inside a narrow housing as in the conventional case, there is no need to remove the disk from the rotating shaft even when only the sensor unit is replaced, which facilitates the work of replacing the sensor unit.

[Embodiment] An embodiment of the photoelectric rotation detection device of the present invention will be described based on FIGS. 1 to 5.

1 and 3 show an ignition distributor of an ignition system for an internal combustion engine, and FIG. 2 shows a photoelectric rotation detection device incorporated in the ignition distributor.

The ignition power distributor A of the ignition device for internal combustion 11na (rotating equipment) detects the rotational speed of the internal combustion engine and the position (rotation angle) of the crankshaft with the power distribution unit 1, and transmits these rotational speed signals and the crankshaft. It consists of a photoelectric rotation detection device 2 applied to a vehicle speed sensor and a rotation angle sensor that transmit position signals to a computer.

The power distribution unit 1 includes a cap 12 having an opening 11 on the side surface;
It consists of a power distribution terminal 13, a center electrode 14 of the cap 12, a side electrode 15 of the cap 12, a center contact piece 16, and a rotor arm 17.

The power distribution unit 1 is configured to transmit a high voltage generated on the secondary side of an ignition coil of an ignition system for an internal combustion engine from a high voltage terminal of the secondary coil to a center electrode 14 of a cap 12 and a carbon brush 16.
, through the rotor arm 17, a spark discharges through an air gap of approximately 0.8 mm, and the side of the cap 12? ! i pole 15
As the power distribution rotor 13 rotates, the internal combustion l1rIA is distributed to the spark plugs of each cylinder according to a prescribed ignition order.

The photoelectric rotation detection device v12 includes a mounting bracket 3 which is a mounting member to the internal combustion 1lIIrIA, a rotor shaft 4 which is a rotating shaft rotatably supported by the mounting bracket 3, and a circle fixed to the rotor shaft 4. A plate 5, a mounting tool 6 for mounting the disc 5 on the rotor shaft 4, a sensor unit 7 fastened to the mounting bracket 3, and a fastener 9 for fastening the sensor unit 1, cap 12, etc. to the mounting bracket 3. and has.

As shown in FIG. 4, the mounting bracket 3 includes an annular base portion 33 that is provided orthogonally to the rotor shaft 4 and has an insertion hole 32 that rotatably supports the rotor shaft 4 via a bearing 31; It consists of a cylindrical part 34 extending downward in the figure from the base part 33 and inserted into the internal combustion engine,
A screw hole 35 is located at a position corresponding to the screw hole 18 of the cap 12.
is formed. Since the mounting bracket 3 of this embodiment does not have a side wall, the side wall of the cap 12 is provided to be somewhat longer than that of a conventional cap. The base portion 33 is formed so that its upper surface in the drawing is substantially flat.

As shown in FIG. 4, the rotor shaft 4 is -! The base portion 33 of the mounting bracket 3 is inserted so that the lower end (lower end in the figure) 41 is connected to the crankshaft (or camshaft) of the internal combustion AM via the coupling 42, and the other end (upper end in the figure) 43 is located inside the cap 12. It is arranged to penetrate through the hole 32 and the cylindrical part 34. Further, this rotor shaft 4 is driven by a coupling 42 at a rotational speed of 172 degrees of the crankshaft (or the rotational speed of the camshaft).

The disk 5 is perpendicular to the rotor shaft 4 and is attached to the mounting bracket 3.
A large number of transparent windows 52 and 53 are provided around the outer peripheral edge 51, and a center hole 54 for inserting the rotor shaft 4 is fixed in parallel to the base portion 33 of the rotor shaft. is formed. Moreover, on the inner peripheral edge 55 of the disc 5,
A screw hole 56 is formed.

As shown in FIG. 4, the mounting tool 6 is attached to the rotor shaft 4.
A sleeve 62 is provided with a cylindrical fitting hole 61 attached to the other end 43, and a flange-like part 64 is formed in a shape corresponding to the flange-like part 63 formed at the lower end of the fitting hole 61 of the sleeve 62 in the drawing. The sleeve 65 and the brim 6 of the sleeve 61
A screw 66 is used to securely fix the disc 5 to the rotor shaft 4 by sandwiching the inner circumferential edge 55 of the disc 5 between the rotor shaft 3 and the flange-like part 64 of the sleeve 65.

The outer periphery of the brim 63 of the sleeve 62 and the sleeve 65
Screw holes 67 and 68 are formed at positions corresponding to the screw holes 56 of the disc 5 on the outer peripheral edge of the brim-shaped portion 64 .

Further, in the upper part of the sleeve 62 as shown in the figure, there are
is installed. Further, the sleeve 65 is formed with six fitting holes into which the other end 43 of the rotor shaft 4 is fitted.

As shown in FIG. 5, the sensor unit 7 connects the hybrid integrated circuit 73 that outputs an electrical signal to the light emitting element 11 and inputs the electrical signal from the light receiving element 72, and the hybrid integrated circuit 73 and the combinator. It consists of a resin sensor case 14 into which a lead wire connector 73a is integrally incorporated, and a resin sensor case 75 into which a light emitting element 71 and a light receiving element 72 are integrally incorporated.

As shown in FIG. 6, the sensor case 74 is formed into a non-ring-like L-shape, and has a semicircular insertion portion PiS 76 through which the rotor shaft 4 is rotatably inserted; it opens radially outward from the insertion portion 76. An insertion opening 71 and a screw hole 18 for fastening to the base portion 33 of the mounting bracket 3 are provided. At the left end of the sensor case 74 in the figure, there is a connector 73a.
is installed. The sensor case 74 is attached to the mounting bracket 3
The mounting bracket 3 is moved along the illustrated upper surface of the base portion 33 from the outside in the radial direction of the rotor shaft 4 toward the rotor shaft 4, and is fastened to a predetermined position on the base portion 33 of the mounting bracket 3.

The sensor case 75 is formed with a lower insertion portion 5a, into which the outer peripheral edge 51 of the disc 5 is inserted. Sensor case 75 is fastened to sensor case 74 with screws 79. The insertion opening 77 of this embodiment opens radially outward from the insertion portion 76 over a range of about 90 degrees. This sensor case 74 is fastened to the base portion 33 of the mounting bracket 30 together with a cap-shaped shield cover 8 that covers the sensor unit 7 .

A light emitting element 71 and a light receiving element 72 incorporated in the sensor case 75 are arranged to face each other via the insertion lower part 5a of the sensor case 75, and are arranged to face each other through the insertion lower part 5a of the sensor case 75, and allow light passing through the transparent windows 52 and 53 of the disc 5 to pass through. Convert to electrical signal.

A screw hole 81 is formed in the shield cover 8 at a position corresponding to the screw hole 36 of the base portion 33 of the mounting bracket 3 and the screw hole 78 of the sensor case 74. This screw hole 81 is provided in a stepped portion 82 for fastening and fixing the sensor unit 7 to the 15111 portion 33 of the mounting bracket 3. The stepped portion 82 of the shield cover 8 allows the sensor unit 7 to be securely fixed to the base portion 33 of the mounting bracket 3, and is able to withstand vibrations caused by an internal combustion engine.

The shield cover 8 is also provided at a position corresponding to the insertion hole 83 through which the rotor shaft 4 is inserted and the opening 11 of the main ship 12, and has an opening 84 through which the connector 73a of the photoelectric sensor unit 1 is inserted. ing.

The fastener 9 connects the screw hole 18 of the cap 12 and the mounting bracket 30.
A screw 93 is inserted through the screw hole 35 of the base part 33 and a screw hole 92 of the packing 91 to fasten the cap 12 to the base part 33 of the mounting bracket 3, and a screw hole 36 of the base part 33 of the mounting bracket 3 is connected to the sensor. It consists of a screw 94 that is inserted through the screw hole 78 of the case 14 and the screw hole 81 of the shield cover 8 and fastens the sensor case 74 and the shield cover 8 to the ki5111 part 33 of the mounting bracket 3, so that the parts can be shared. ing. 95 is the base part 33 of the mounting bracket 3 and the sensor case 14
96 shows the patchkin placed between the
The screws for fastening the to the base portion 33 are shown.

The assembly of this embodiment into an ignition distributor will be explained based on the drawings.

First, the disc 5 is held between the flange-like part 63 of the sleeve 62 and the flange-like part 64 of the sleeve 65, and these screw holes 56, 67, and 68 are aligned, and the disc 5 is tightened with the screw 66. is fixed to the sleeve 62.65. This disk 5, sleeve 62
．． 65 into the fitting hole 6 of the sleeve 65.
The sleeve 62 is inserted into the other end 43 of the rotor shaft 4 by driving or the like, and the sleeve 62 is attached to the other end 43 of the rotor shaft 4.
．． 65 are fitted into the fitting holes 61 and 69, and the first assembled body is fixed to the other end 43 of the rotor shaft 4 to form a second assembled body.

One end 41 of the rotor shaft 4 of this second assembly is inserted into the insertion hole 32 of the four base portion 33 of the mounting bracket 3, and protrudes from the lower end of the cylindrical portion 34 as shown in the figure. τ, as shown in FIG.
Attach the second assembly to 4.

After that, the abbreviated sensor case 75 incorporating the light emitting element 71 and the light receiving element 72 is connected to the connector. 3a is attached to the sensor case 74 with screws 79 to form the sensor unit 7.

The sensor unit 7 is moved toward the rotor shaft 4 from the outside in the radial direction of the rotor shaft 4 along the illustrated upper part of the base portion 33 of the mounting bracket 3 so that the insertion opening 77 is visible. The outer peripheral edge 51 of 5 is connected to the sensor case 75.
Insert it into the insertion lower 5a.

A shield cover 8 is provided with a stepped portion 82 for fastening the sensor unit 1 to the base portion 33 of the mounting bracket 3.
cover the sensor unit 1. Connect the screw holes 78 and 81 of the shield cover 8 and sensor case 74 to the mounting bracket 3.
The sensor unit 1 is securely fixed to the base part 33 of the mounting bracket 3 by matching with the screw hole 36 of the base part 33 and fastened with the screw 94, and can withstand the vibrations of the internal combustion vaIIl.

Further, the power distribution rotor 13 is fixed to the upper part of the sleeve 62 as shown in the figure, and the power distribution section 1 is assembled into the key 1? Place the tab 12 through the packing 91, match the screw holes 18, 35, 92, and attach the cap 12 to the base part 3 of the mounting bracket 3 with the screw 93.
3.

Therefore, the first
After the assembled body is attached to the rotor shaft 4, the outer peripheral edge 51 of the disc 5 can be inserted into the insertion lower part 5a of the sensor case 75, so that the light emitting element 7 of the sensor unit 7
1 and the light receiving element 72 can be arranged to face each other above and below the outer peripheral edge 51 of the disc 5, and there is no need to assemble the disc and the sensor unit within a narrow housing as in the conventional case. The ease of assembly to the ignition distributor can be improved.

Even if only the sensor unit 7 is to be replaced, remove the shield cover 8 and cap 12 from the mounting bracket 3, remove the sensor unit 7 from the mounting bracket 3, and replace the rotor shaft 4 radially outward. It is sufficient to remove the sensor unit from the shaft 4 and then insert another sensor unit into the rotor shaft 4 using the method described above.
There is no need to remove the sleeves 62, 65 from the rotor shirts 1-4.

Replacing the sensor unit 1 becomes easier.

Therefore, these effects cannot be achieved with a photoelectric rotation detection device in which a light emitting element and a light receiving element are provided above and below a disk as in this embodiment, or in a photoelectric rotation detection device in which a light emitting element and a light receiving element cannot be formed into an upward U-shape. This is very advantageous for the device.

In this embodiment, sleeves 62, 65 and screws 66 are used as attachment tools for the disc, but other attachment tools such as washers may be used in place of the sleeve 65.

In this embodiment, the sensor case is formed into a non-closed annular L-shape, but it may also be formed into a U-shape, an 8-shape, a semicircular fan shape,
The invention is not limited to this embodiment as long as the insertion opening is formed to a width that allows insertion into the rotating shaft (for example, an insertion path having a width slightly larger than the rotating shaft). For example, the insertion opening may be curved, or the insertion opening may be provided with a step. However, in view of the relationship between the light-emitting element, the light-receiving element, and the connector, it is desirable that the insertion opening be at an angle of 90 degrees or less.

In this embodiment, the connector is built into the sensor case of the sensor unit, but a wire-type sensor unit may be used in which nine lead wires are taken out from the light emitting element and the light receiving element as wires outside the cap.

In this embodiment, the photoelectric rotation detection device is incorporated into the ignition device ignition distributor for internal combustion II, but it does not have a power distribution section.
It may be used for a device that detects only the rotational speed or rotation angle of one meter, or it may be used for a 5mlt of electricity, gas, water, etc.

As another example, by providing an opening in the cap and the shield cover into which the sensor unit can be inserted, the sensor unit can be inserted with the cap and the shield cover attached to the mounting fittings. In addition, a side wall portion containing a photoelectric rotation detection device is formed on the mounting bracket.
An opening into which the sensor unit can be inserted may be provided in a part of the side wall.

As another example, the configuration ms of the power distribution part of the ignition power distributor
can be modified in various ways.

[Brief explanation of drawings]

FIG. 1 is an assembly diagram of an ignition distributor incorporating an embodiment of the present invention, and FIG. 2 is an assembly diagram of an ignition distributor incorporating an embodiment of the present invention.
3 is a sectional view taken along line B-8 in FIG. 2; FIG. 4 is a sectional view showing a rotor shaft and a disc according to an embodiment of the present invention; 6 is a front view showing a sensor unit according to an embodiment of the present invention, FIG. 6 is a sectional view showing an ignition distributor of an ignition device for internal combustion vs IIl incorporating a conventional photoelectric rotation detection device, and FIG. 7 is a conventional FIG. 3 is a front view showing a sensor unit of the photoelectric rotation detection device of FIG. In the diagram A...Ignition power distribution device 1...Power distribution section 2...Photoelectric rotation detection device 3...Mounting bracket (mounting member) 4.
...Rotor shaft (rotating shaft) 5...Disc plate 7.
...Sensor unit 9...Fastener 33...Base part 52.53...Transparent window 71...Light emitting element 7
2... Light receiving element 73a... Connector 14.75
...Sensor case 75a...Inlet 77...
Insertion opening

Claims (1)

[Scope of Claims] 1) A rotating shaft connected to a rotating device; a mounting member rotatably supporting the rotating shaft and having an annular base portion; A circular plate provided with a light window, and a non-closed annular sensor case having a slit-shaped insertion opening into which the disc is inserted, are arranged so as to face above and below the light-transmitting window. a sensor unit that integrally incorporates a light emitting element and a light receiving element and is fastened to the base part of the mounting member, and the sensor unit is mounted along the base part of the mounting member in the direction of the rotation axis. The photoelectric rotation detection device is moved to a position where the disc is inserted into the insertion port and fastened with a fastener. 2) The photoelectric rotation detection device according to claim 1, wherein the rotation detection device is a rotation angle sensor for detecting a crank angle of an internal combustion engine.