JPS59185876A - Photo-electric type signal generator for engine igniting distributor - Google Patents

Abstract

PURPOSE:To make assembling work easier, by forming a center bore of a disc into a long hole and approximating its short axial direction to a shaft diameter, while setting the long axial direction down to the moving allowance required for in time of being inserted into a gap in a sensor of the disc, at a time when assembling a distributor. CONSTITUTION:A disc 14 is attached to a shaft 3 via a spacer 7 and a blank 15, and its center bore 14a is of long hole in type, while more than one unit of positioning guide holes 4b are installed in a plane part excepting this long hole and slits 2a and locked thereat with a screw 16. The center bore 14a of the disc 14 is formed into a long hole as aforesaid, and its short axial direction is approximated to a diameter of the shaft 3 while its long axial direction is so considered as to make it a moving allowance for the disc 14 required in time of being inserted into a gap in a sensor 1 of the disc 14 when assmebling a distributor. With this constitution, a function of the blank 15 comes only to hold the disc, making assembling work easier and, what is more, miniaturization and lightweightiness are made attainable whereby eccentricity in shafting is remarkably reduced, thus metal load is relieved.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement of a photoelectric signal generator provided in an engine ignition power distributor for generating timing pulses corresponding to the number of cylinders or crank angle.

A conventional device of this type is shown in FIG. l
In fi, 11) is a sensor, (2) is a disk, (
3) is a shaft, and (4) is a blank. shaft +
8) is rotatably supported by a housing (5) and connected to a camshaft (not shown) of the engine via a coupling (6). 1- A rotor is attached to the other end of the shaft (8) with a disk (2) by a spacer (7), a blank (4) and a bolt (8), and further has a rotor electrode (9) on the blank (4). αQ is fixed. One end of the rotor electrode (9) is always in contact with the center electrode σσ, and the other end is successively opposed to the peripheral electrode (2). The blank (4), which roughly transmits the rotation of the engine, is supported together with the housing (5) by a holder integrated with a sleeve metal or bearing that contacts this f'LI/c. on the other hand)
As shown in Fig. 2, the disk (2) has a disc shape with a large number of slits (2a) formed on its circumference, and is used to convert light passing through the slits (2a) into electrical signals. The light emitting element ([a) and the light receiving element (tb,
) are opposed to each other in the thrust direction with the disk (2) in between. Since the disc (2) generates the engine's ignition timing signal, the center of the disc (2) should be placed on the axis of the shaft (8)), and the position should be adjusted in the radial direction. Guide hole center hole (2
b) was provided.

Since the conventional photoelectric signal generating device is configured as described above, the light emitting element (La) and the light receiving element (Lb) of the sensor [1] must be arranged so as to face each other in the thrust direction. In other words, due to the problem of positioning the optical axis, etc., the disc (
After the surface layer of 2), a light emitting element (La) and a light receiving element (tb, )
It is difficult to confront them. Therefore, when assembling the power distribution device, after installing the shaft (3) and sensor [1)' in the predetermined positions of the housing (5),
) is tilted in the radial direction, insert its peripheral part into the gap of the sensor (ri), then align the center hole (2b) of the guide hole with the center protrusion of the shaft (3), and then insert the blank. (4) is fixed.At this time, the center protrusion of the shaft 18) cannot be higher than the gap position of the sensor f1), so the fitting part between the blank (4) and the shaft (3) is The shaft (8) of the blank (4) must be made significantly shallower and therefore the shaft (8) of the blank (4)
Positional accuracy such as perpendicularity and coaxiality with respect to
) must be placed in the center of the blank, so the outer diameter of the blank (4) becomes large. As a result, the BY value of the sleeve metal of the holder @ becomes large due to the outer diameter of the blank (4), and due to eccentricity caused by the blank (4) falling, etc., the metal load becomes extremely large, resulting in poor reliability. And'fc.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional devices, and one embodiment of the invention will be described below with reference to the drawings. In FIG. 8, 11) is a sensor, (t
a) is a light emitting element, ([b) is a light receiving element, (8) is a shaft, (5) is a housing, (6) is a coupling, (7
) is a spacer, (9) is a rotor electrode, αq is a rotor, α
η is a center electrode, (b) is a peripheral electrode, and (to) is a holder, and the above structure is the same as that of ttg. Q5
is a blank, 04) is a disk, uQ is a screw, and the disk Q4, which is attached to the shaft (3) via the spacer (7) and the blank αe, has a long center hole (L4a) as shown in Fig. 4. This long hole and Surin) (2
Positioning guide hole (L4b) on the flat surface except a)
At least one or more are provided and fixed by the screw OQ.

In the above configuration, the center hole (disk 04)
L4a) is an elongated hole, and the short axis direction of this elongated hole is approximated to the diameter of the shaft (8) (depending on the tolerance that allows fitting), and the long axis direction is set to Disk 0 required when inserting disk 0Φ sensor (1) into the gap
The shaft (3) is not restricted by the device of the disk C1, and the central protrusion can be extended since the configuration takes into account the minimum amount of movement allowed for the shaft (3). Therefore blank α5
1/) The only function is to hold the disc at 0 fathoms, making it possible to make it smaller and lighter. Moreover, the sleeve metal of the holder only needs to directly support the diameter of the shaft (8), and concerns about eccentricity of the shaft system are significantly reduced, so the load on the metal can be greatly reduced.

In the above embodiment, a power distribution device in which the shaft is supported at both ends has been described, but a power distribution device in which the shaft is supported at one end may also be used, and this example is shown in FIG.

As described above, according to the present invention, since the center hole of the disk is made of an elongated hole, the power distributor can be easily assembled, the device can be made smaller and lighter, and the reliability can be significantly improved by reducing the metal load on the holder. There are effects such as

[Brief explanation of the drawing]

Fig. 2 is a cross-sectional side view showing a conventional photoelectric signal generator for an engine ignition power distributor, Fig. 2 is a plan view showing the disk of Fig. 1, and Fig. 8 shows an embodiment of the present invention. A sectional side view, FIG. 4 is a plan view showing the disk of FIG. 3,
FIG. 5 is a sectional side view showing another embodiment of the invention. In the figure, (1) is a sensor, (ta) is a light emitting element, ([b)
is the light receiving element, (3) is the shaft, (5) is the housing,
(8 is a coupling, (A) is a spacer, (9) is a rotor electrode, αQ is a rotor, 3 is a center electrode, (2) is a peripheral electrode, 4 is a holder, Q4 is a disk, (14&) is a long hole (t4b) is a guide hole, (2a) is a central hole consisting of
is a slit, (to) is a blank, and αQ is a screw. In addition, the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A shaft that transmits the rotation of the engine, a spacer on this shaft, a disc with a large number of slits on the outer part of the disc which is clamped and fixed to the blank, and a transmissive photoelectric device installed oppositely above and below this disc. A photoelectric signal consisting of a type sensor, a housing, a holder attached to the housing and having a sleeve metal etc. that contacts and supports the outer diameter of the shaft, a power distribution rotor attached directly to the shaft, and a cap that distributes high voltage to the engine. In the generator, the center hole of the disk has a short axis approximated to the diameter of the shaft, and a long axis has an elongated hole shape that takes into account the minimum movement allowance of the disk when assembling the device, and the elongated hole and A photoelectric signal generating device for an engine ignition power distributor, characterized in that at least one positioning hole in the radial direction is provided in a flat part of the disk other than the slit.