JPH0218689Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a signal generator that constitutes a signal generator together with an inductor rotor.

[Prior Art] When it is necessary to generate a signal at a predetermined rotation angle position of a rotating body, for example, when obtaining a signal that determines the ignition timing of an ignition system for an internal combustion engine, an inductor rotating type signal generator is used. It is often used.

A signal generator used as a stator for an inductor rotating signal generator has a stator plate that integrally has a base plate fixed to a mounting location and an upright wall raised from the base base, and one magnetic pole face. an iron core having a permanent magnet in contact with the upstanding wall, a contact part in contact with the other magnetic pole surface of the permanent magnet, and a salient pole part protruding from the contact part to the opposite side of the permanent magnet; , a signal generating coil wound around the salient pole portion of the iron core, and a case that covers the upright wall portion, the iron core, the permanent magnet, and the signal generating coil together with an insulating frame, and an insulating resin is contained in the case. The resin is injected and molds the parts inside the case.

[Problems to be solved by the invention] In the signal generator having the structure described above, the main parts of the signal generator, which consist of the magnet, the iron core, the signal generator coil, and the case that covers them, are mounted on the upright wall of the stator plate. Because it is supported by the handle, if an external force is applied to the case when installing the signal generator, the upright wall of the stator plate will bend and deform, causing the gap between the magnetic pole part of the signal generator and the rotor to bend and deform. There is a problem in that the gap cannot be set to a predetermined size, resulting in variations in the waveform and size of the signal voltage.

In addition, if the main part of the signal generator is supported by a cantilever as described above, the main part of the signal generator can easily be displaced due to vibration, causing a gap between the magnetic poles of the signal generator and the magnetic poles of the rotor. The signal waveform was sometimes distorted because the gap of the signal fluctuated.

Variations in the magnitude and waveform of the signal voltage may cause malfunctions or variations in characteristics when the operation of the device is controlled using the waveform and magnitude of the signal voltage. For example, in an ignition system for an internal combustion engine, the ignition timing is controlled by utilizing the fact that the waveform and magnitude of the signal voltage change as the engine speed increases. If the waveform and magnitude of the signal voltage were different for each electron, constant ignition characteristics could not be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a signal generator that solves the above problem by preventing the upright wall portion of the stator plate from deforming.

[Means for Solving the Problems] As shown in FIGS. 1 to 3 showing one embodiment of the signal generator to which the present invention is applied, the signal generator includes a substrate portion 101 fixed to a mounting location; The substrate part 1
01, a permanent magnet 4 whose one magnetic pole surface is in contact with the upright wall 102, and a permanent magnet 4.
an iron core 3 having a magnet contact part 301 laminated on the permanent magnet and in contact with the other magnetic pole surface of the iron core 3; It includes a signal generating coil 2 wound around a salient pole part 302, and a case 5 that covers the standing wall part 102, the iron core 3, the permanent magnet 4, and the signal generating coil 2. Insulating resin is cast inside the case.
The parts inside the case are molded with the resin.

The present invention is characterized in that, in such a signal generator, a protrusion 1A is provided on the base plate 101 of the stator plate 1 and protrudes into the case 5, and at least a part of this protrusion is embedded in the resin within the case 5. shall be.

[Function] As described above, when a protrusion is provided on the base plate of the stator plate and at least a portion of the protrusion is embedded in the resin in the case, the protrusion causes the signal generator attached to the upright wall of the stator plate to be activated. Since the main part is supported even at a position away from the upright wall, it is possible to prevent the upright wall of the stator plate from bending due to external force, and the upright wall of the stator plate is deformed and the signal generator This can prevent the gap between the rotor and the rotor from going out of order.

Further, when vibration is applied to the signal generator, it is possible to prevent the main part of the signal generator from vibrating greatly, so that distortion of the signal waveform due to vibration can be prevented.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention, and in these figures, reference numeral 1 denotes a stator plate made of a ferromagnetic material such as iron. This stator plate includes a band-like board portion 101 with rounded ends, and a rectangular plate-like standing wall portion 102 that stands up from the side surface of the central portion of the board portion 101 in a direction perpendicular to the board surface of the board portion 101. The substrate part 101 consists of
Attachment holes 103, 103 are provided at both ends. Also, in the center of the substrate part 101 is a resin injection hole 1 used when pouring resin into the case, which will be described later.
04 is provided.

One magnetic pole surface of a rectangular plate-shaped permanent magnet 4 magnetized in the thickness direction is in contact with the upright wall portion 102 of the stator plate 1, and the iron core 3 is in contact with the other magnetic pole surface of the magnet. .

The iron core 3 is in contact with the other magnetic pole surface of the magnet 4, and a rectangular plate-shaped magnet contact portion 301 is laminated on the magnet.
and a salient pole portion 302 that protrudes from the center of the magnet contact portion 301 to the side opposite to the magnet 4. The salient pole portion 302 of this iron core is, for example, a magnet contact portion 30
It can be formed by cutting and raising a part of 1.

Reference numeral 6 denotes an insulating frame made of synthetic resin, and this insulating frame protects the upright wall part 102 of the stator plate 1 until the laminate of the magnet contact part 301 of the iron core 3 and the magnet 4 is molded with resin. It is designed to be temporarily fixed. The illustrated insulating frame 6 is composed of the iron core 3
It consists of a fixed frame part 601 that fixes the stacked body of the magnet contact part 301 and the magnet 4 to the upright wall part 102 of the stator plate, and a winding frame part 602 that is integrally formed with the fixed frame part 601. ing. The fixed frame portion 601 has the salient pole portion 30 on the magnet contact portion 301 of the iron core 3.
A plate-shaped bottom part 603 and the bottom part 60 that come into contact from two sides
The standing wall portion 102 of the stator plate from both ends of 3
The side wall portions 604, 604 are formed in a U-shape with a pair of side wall portions 604, 604 projecting to the side.
At the tips of the two side walls 604, 604 are provided locking claws 605, 605 that protrude inward in the opposing direction. Further, the winding frame portion 602 has a body portion 606 and collar portions 607 and 608 provided at both ends of the body portion 606, and the signal generating coil 2 is wound around the outer periphery of the body portion 606.

The fixed frame portion 601 of the frame body 6 is fitted into a laminate of the magnet contact portion 301 of the iron core 3, the magnet 4, and the standing wall portion 102 of the stator plate.
The locking claws 605, 605 of the stator plate 1
The magnet 4 and the iron core 3 are temporarily fixed to the stator plate 1 by engaging with the corners of the upstanding wall portion 102 and holding the stacked body. Salient pole portion 30 of iron core 3
2 is inserted into a hole inside the body section 606 of the winding frame section 602, and its tip is exposed to the outside.

Both ends of the signal generator coil 2 are soldered to lead wires 7 and 8, and these lead wires are locked in lead wire locking grooves 609 and 610 provided at the base of the frame body 6 and led out. There is.

A resin case 5 is fitted so as to cover the main parts of the signal generator consisting of the standing wall portion 102 of the stator plate, the magnet 4, the iron core 3, the frame 6 and the signal generator coil 2, and the base plate of the stator plate 1. Part 1
A thermosetting resin is poured into the case from the resin injection hole 104 of 01, and each component in the case 5 is molded and fixed with the resin.

In the present invention, in such a signal generator, a protrusion 1A protruding into the case 5 is provided on the base plate 101 of the stator plate 1, and at least a part of the protrusion 1A is embedded in the resin within the case 5. Features. Various methods of providing this protrusion can be considered, but in this embodiment, as shown in FIG.
A protrusion 1A is formed by screwing into the protrusion 1A.

The above protrusion 1A is the standing wall portion 1 of the stator plate.
It is preferable to provide the salient pole part 302 at a position as far away from the salient pole part 302 as possible in the protruding direction. Also, when a pair of protrusions 1A and 1A are provided as shown in the figure, both protrusions are located on the left and right sides when viewed from the front (Fig. 1). Preferably, they are arranged in symmetrical positions.

If the protrusion 1A is formed of a member separate from the stator plate as in this embodiment, the protrusion 1A can be made of a non-magnetic material, so the protrusion 1A becomes a path for leakage magnetic flux and adversely affects the signal. can be prevented.

5 and 6 show a modification of the projection 1A. In this example, the projection 1A is formed by cutting and raising a part of the base plate 101 of the stator plate 1.
A is formed, and the protrusion 1A is embedded in the resin inside the case 5.

Further, FIGS. 7 to 9 show still another modification of the projection 1A. In this example, the peripheral edge of the resin injection hole 104 provided in the center of the base plate 101 of the stator plate 1 is an upstanding wall. A cylindrical projection 1A is punched out on the same side as the portion 102, and this projection 1A is embedded in the resin within the case 5. Furthermore, in this example, the mounting holes 103, 103 provided in the base plate of the stator plate 1 are
Cylindrical protrusions 105, 105 are formed in which the peripheral edges of the mounting holes 103, 103 are continuous with the peripheral edges of the mounting holes 103, 103 by being punched out on the side opposite to the upright wall portion 102.
If such a protrusion 105 is provided, the signal generator can be positioned by fitting the protrusion 105 into a hole provided in the mounting portion of the signal generator.

The above-mentioned signal generator S is fixed to a mounting part provided in the case of an internal combustion engine, for example, by a screw passed through a mounting hole 103 of the stator plate 1, and is attached to a magnetic pole part at the tip of a salient pole part 302 of the iron core 3. and the side surface of the substrate portion of the stator plate 1 are opposed to the inductor magnetic pole portion Ra of the inductor type rotor R via a predetermined cap. When the inductor magnetic pole part Ra faces the magnetic pole part of the signal generator as the rotor R rotates, magnet 4 - iron core 3 - inductor magnetic pole part Ra - stator plate base part 101 - standing wall part 102 -
A large magnetic flux flows through the magnetic path of the magnet 4, and a signal voltage is induced in the signal generator coil 2 due to the change in the magnetic flux at this time. The waveform and magnitude of this signal voltage depend on the gap between the signal generator and the rotor.
In the present invention, a protrusion 1A is provided on the base plate of the stator plate and the protrusion 1A is embedded in the resin to prevent the standing wall of the stator plate from falling forward, so that the magnetic poles of the signal generator and the rotor are The gap between the magnetic poles and the magnetic poles can be kept constant, and variations in the magnitude and waveform of the signal voltage can be reduced.

10 to 12 show still another modification of the protrusion 1A provided on the base plate portion of the stator plate 1. In this example, a cylindrical protrusion formed by punching out the peripheral edge of the resin injection hole 104 is shown in FIGS. Slits 1a extending in the axial direction are formed at symmetrical positions of the parts,
Two protrusions 1b, 1b having semicircular cross sections are formed that face each other with a slit 1a interposed therebetween, and these protrusions 1b, 1b form a protrusion 1A.

As shown in FIGS. 7 to 9, the resin injection hole 1
When the cylindrical protrusion 1A is provided on the peripheral edge of the case 5, the flow of the resin is obstructed by the peripheral wall of the cylindrical protrusion when resin is cast into the case 5.
There is a possibility that the number of molded pieces per unit time will be limited. On the other hand, if a protrusion 1A divided into a plurality (three or more is possible) by a slit 1a is provided around the resin injection hole 104 as shown in FIGS. 10 to 12, resin can be injected through the resin injection hole 104. This allows the resin to flow smoothly when
The number of pieces cast per unit time is not limited, and the efficiency of casting work can be improved.
In addition, the peripheral wall of the protrusion 1A allows the resin to flow smoothly into the case 5 without interfering with the flow of the resin, allowing the resin to flow uniformly along the surface of the signal generating coil, thereby insulating the signal generating coil. can be made good.

[Effects of the invention] As described above, according to the invention, the main part of the signal generator is Since it is supported even at a position away from the standing wall of the stator plate, it is possible to prevent the standing wall of the stator plate from bending due to external force, and to prevent the gap between the signal generator and the rotor from bending. This has the advantage of preventing variations in the magnitude and waveform of the signal voltage due to variations.

Further, when vibration is applied to the signal generator, it is possible to prevent the main part of the signal generator from vibrating greatly, and therefore, it is possible to prevent the signal waveform from being distorted due to vibration.

[Brief explanation of the drawing]

1 to 3 are a front view, a right side view, and a top view showing an embodiment of the present invention, respectively. FIG. 5 and 6 are a top view and a right side view showing modified examples of the stator plate used in the present invention, respectively, and FIGS. 7 to 9
The figures each show a top view, right side view, and front view of other modified examples of the stator plate used in the present invention, and FIGS. 10 to 12 each show still other modified examples of the stator plate used in the present invention. FIG. 4 is a top view, a right side view, and a front view. 1... Stator plate, 101... Substrate part,
102... Standing wall portion, 1A... Protrusion, 2... Signal generating coil, 3... Iron core, 301... Magnet contact portion, 302... Salient pole portion, 4... Permanent magnet, 5...
Case, 6... Insulating frame, 601... Fixed frame.

Claims (1)

[Claims for Utility Model Registration] A stator plate 1 that integrally includes a base plate portion 101 fixed to a mounting location and a standing wall portion 102 that stands up from the base plate portion 101, and the standing wall portion 10.
a permanent magnet 4 with one magnetic pole surface in contact with the permanent magnet 2; a magnet contact portion 301 in contact with the other magnetic pole surface of the permanent magnet 4 and laminated on the permanent magnet; An iron core 3 having a salient pole part 302 protruding on the side opposite to the permanent magnet, and a salient pole part 30 of the iron core.
2, and a case 5 that covers the upright wall portion 102, the iron core 3, the permanent magnet 4, and the signal generator coil 2, and an insulating resin is cast inside the case 5. In the signal generator in which the parts inside the case are molded with the resin, a protrusion 1A protruding into the case 5 is provided on the base plate portion of the stator plate 1, and at least a part of the protrusion 1A is inside the case. A signal generator characterized by being embedded in a resin.