JPS6145737Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an inductor type signal generator that supplies a control signal to an internal combustion engine ignition system.

In an inductor-type signal generator, it is necessary to install an iron core, a signal coil, and a permanent magnet to flow magnetic flux through the iron core on the stator side, but in conventional generators of this type, the magnet mounting structure is particularly complicated. Ta. In addition, in conventional signal generators of this type, it is necessary to perform processing such as cutting the stator magnetic pole surface in order to adjust the gap between the stator magnetic pole and rotor magnetic pole to a predetermined value after assembly, which is troublesome and Ta.

The purpose of this invention is to provide an inductor type signal generator for an internal combustion engine ignition system, which simplifies the mounting structure of the magnet on the stator side and also enables accurate gap dimensions between the rotor and stator. It is about providing.

The signal generator of the present invention will be explained in detail below with reference to the illustrated embodiments.

1 to 3, reference numeral 1 denotes a substantially fan-shaped stator base plate made of magnetic material, and this base plate has mounting holes 101, 101 near both ends thereof, as shown in FIGS. 4A and 4B. It is designed to be screwed onto the engine using these mounting holes. Approximately in the center of the base plate 1 is a punched window 102 for preventing magnetic flux from leaking from the magnetic pole portion of the iron core to the base plate, which will be described later.
is formed, and on both sides of this window 102, cut and raised portions 103, 103 are formed to prevent the molded portion from coming off when the stator is molded.
A first stator magnetic pole part 104 facing an inductor type rotor, which will be described later, is formed at the arc-shaped end of the base plate 1, and at the end opposite to this first stator magnetic pole part 104, A rising portion 105 having a flat surface substantially perpendicular to the radial direction of the arc of the first stator magnetic pole portion 104 is provided slightly offset to one side from the center in the width direction of the base plate. .

In FIGS. 1 to 3, 2 is a bobbin molded from synthetic resin, and as shown in FIGS. It consists of a winding part 202, flange parts 203 and 204 provided at both ends of this winding circuit, and a frame part 205 integrally formed with one flange part 203. The frame portion 205 has a cavity 206 with a part of the back surface and an open top surface, and a hole 207 having a rectangular cross section through which the rising portion 105 of the base plate 1 passes is provided at the bottom of the cavity. There is. A groove 208 opening upward is formed in one side of the magnet and frame portion 205 of the bobbin 2, and a groove 208 of the flange 203 is formed.
A pair of notches 209, 209 for leading out the ends of the coil are provided in a portion adjacent to the coil. A protrusion 210 is formed between the flange 203 and the groove 208 to separate the conductive wires passed through the notches 209 and 209. The signal coil 3 is wound around the winding portion 202 of this bobbin by a predetermined number of turns.

4, as shown in FIGS. 6A and 6B, a long first plate portion 402 having a second stator magnetic pole portion 401 at the tip, and a long plate portion 402 from the rear end of this first plate portion. The core is made up of a short second plate-like part 403 bent at a substantially right angle, and the second plate-like part 403 is formed wider than the first plate-like part 402 . This iron core 4
is the opening 206a (fifth) on the back side of the empty space 206.
The first plate-shaped part 402 is inserted into this cavity from the side (see Figure B), and the first plate-shaped part 402 is inserted into the core insertion hole 201, and the second plate-shaped part 403 is inserted into the cavity 206 of the flange 203.
It is in contact with the side end face. In this state, the tip of the first plate-like portion 402 of the iron core 4 protrudes from the flange 204 of the bobbin 4. Blank space 2
The rising portion 105 of the base plate 1 is inserted through the hole 207 into the 06, and a permanent plate magnet magnetized in the thickness direction is inserted between the rising portion 105 and the second plate portion 403 of the iron core 4. A magnet 5 is held between them.

Terminal fittings 6 connected to both ends of the signal coil 3
As shown in FIGS. 7A and 7B, the first and second terminal fittings 601 have U-shaped tips.
and 601', and when assembled, these terminal fittings are connected by a connecting portion 602. This terminal fitting 6 is fitted into the groove 208 by utilizing the elasticity of the U-shaped portions of the first and second terminal fittings 601 and 601'. Both ends of the signal coil 3 led out through the notches 209, 209 of the flange 203 of the bobbin are attached to the metal fittings 601, 6.
It is soldered to 01.

7 is a molded part made of a non-magnetic material such as synthetic resin, and this molded part includes the bobbin 2 around which the signal coil 3 is wound, the part of the iron core 4 excluding the vicinity of the magnetic pole part 401, and the cutout of the base plate 1. It is provided so as to cover and integrate the raised portion 103 and the raised portion 105, the permanent magnet 5, the portion of the terminal fitting 6 excluding the tip, and a portion of the base plate 1. In this assembled state, the magnetic pole portion 401 of the iron core 4
is located on the side of the window 102 of the base plate 1, and the magnetic pole part 40
A large leakage magnetic flux is prevented from flowing from the base plate 1 to the base plate 1.

The above-mentioned parts constitute a stator, and the stator is attached to the engine by fixing the stator base plate 1 to a case (not shown) of the internal combustion engine.

Reference numeral 8 denotes an inductor type rotor, and this rotor includes a cylindrical first rotor magnetic pole part 801 and a protrusion provided offset in the axial direction with respect to the first rotor magnetic pole part 801. It consists of a polar second rotor magnetic pole part 802, and is attached to the crankshaft, camshaft, etc. of an engine. And the first rotor magnetic pole part 80 of the rotor 8
1 always faces the first magnetic pole part 104 of the base plate 1 with a slight gap in between, and the second rotor magnetic pole part 80
2 faces the magnetic pole portion 401 of the iron core 4 through a slight gap only once per rotation of the rotor. In this signal generator, when the second rotor magnetic pole part 802 faces the magnetic pole part 401 of the iron core 4, permanent magnet 5 → iron core 4 → second rotor magnetic pole 802 → first rotor magnetic pole 803 → A large magnetic flux flows in the path from the base plate 1 to the permanent magnet 5, and a signal voltage is generated in the signal coil 3 due to the change in the magnetic flux at this time.

Next, the assembly of the stator of the signal generator described above will be explained. To assemble the stator, first, the signal coil 3 is wound around the winding portion 202 of the bobbin 2, and the beginning and end of the winding are soldered to the first and second terminal fittings 601 and 601'. Next, these terminal fittings are fitted into the grooves 208 of the bobbin. Next, the iron core 4 is inserted into the hollow space 206 of the bobbin, and the first plate-shaped part 402 is inserted into the iron core insertion hole 201.
Insert into. After that, the magnet 5 is inserted into the cavity 206 and brought into contact with the second plate-shaped portion 403 of the iron core 4,
The rising part 105 of the base plate 1 is passed through the hole 207 of the bobbin, and the rising part 105 is inserted into the space 206 to attach the magnet 5.
bring it into contact with. As a result, the magnet 5 moves to the rising part 1
05 and the second plate-shaped portion 403 of the iron core. In this state, place the entire bobbin on the base plate 1.
The stator is completed by molding together with the cut and raised portions 103, cutting the connecting portions 602 of the terminal fittings 6, and soldering the external lead wires 9 to the first and second terminal fittings 601 and 601'. . When molding the bobbin, the magnetic pole part 401 of the iron core 4
In order to prevent the magnetic pole part 401 from being molded, it is necessary to securely insert the magnetic pole part 401 into a groove provided in the mold.
Since this window 102 is provided, it can be easily confirmed through this window 102 that the magnetic pole part 401 has been inserted into the groove of the mold, and it is possible to reliably prevent the magnetic pole part 401 from being molded.

In the above embodiment, if manufacturing errors of the component parts are accumulated, there is a risk of variations in the gap between the second stator magnetic pole section 401 and the second rotor magnetic pole section 802. In the example, with the rising portion 105 of the bed plate 1 fitted into the hole 207 of the bobbin 2, the rising portion 105 of the bed plate 1 is pushed from the back side of the bobbin, thereby forming the second stator magnetic pole portion 4.
01 position can be adjusted. Therefore, the dimensional tolerance of each part is determined so that the gap between the second stator magnetic pole part 401 and the second rotor magnetic pole part 802 becomes large when manufacturing errors of each part are accumulated. The gap can be easily adjusted by pressing the rising part 105 of the base plate from the back side of the bobbin to obtain the dimension l shown in Fig. 1 before forming the mold part 7. No cutting is required. The gap can be adjusted by inserting a pin provided in the mold through the window 206a on the back of the bobbin when molding the bobbin, and using this pin to push the rising portion 105 of the base plate to obtain the dimension l. It is convenient to do so. In this way, the molding can be performed while maintaining the dimension l using the pins, so that the gap can be adjusted accurately.

As described above, according to the present invention, a space is provided in the bobbin into which the magnet, the iron core, and the rising part of the bed plate are inserted, and the magnet is held between the iron core and the rising part of the bed plate within this space. This makes it possible to reliably hold the magnet without using a special jig until the bobbin is molded. In addition, since a recess is provided in the bobbin and the terminal fitting is fitted into the recess, the terminal fitting can be easily attached.This, together with the ease of attaching the magnet as described above, makes assembly easier. can be facilitated. Furthermore, the position of the magnetic pole part of the stator core can be adjusted by pushing the rising part of the base plate, so the gap between the stator and rotor magnetic pole parts can be adjusted without cutting the core. There is. Furthermore, since the base plate is provided with a window to prevent magnetic flux leakage, it is possible to increase the change in magnetic flux when the salient magnetic pole part of the rotor faces the magnetic pole part of the stator core, resulting in a compact design. can be configured to extract a large output signal.

[Brief explanation of the drawing]

FIGS. 1 to 3 are a front view, left side view, and bottom view showing the configuration of an embodiment of the present invention, and FIGS. 4 to 7 show parts used in the same embodiment, Figures 4A and B are the left side view and front view of the base plate, Figures 5A to D are the top view, rear view, left side view, and front view of the bobbin, respectively, and Figures 6A and B are the iron cores, respectively. FIGS. 7A and 7B are a front view and a plan view of the terminal fitting, respectively. 1... Base plate, 104... First stator magnetic pole part,
105... Rising part, 2... Bobbin, 201...
Iron core insertion hole, 206...vacancy, 207...hole, 2
08... recess, 3... signal coil, 4... iron core,
401...Second stator magnetic pole part, 402...First
plate-like part, 403... second plate-like part, 5... permanent magnet, 6... terminal fitting, 7... mold part, 8...
...Inductor type rotor, 801...First rotor magnetic pole part, 802...Second rotor magnetic pole part.

Claims (1)

[Scope of utility model claims] An inductor type having a first rotor magnetic pole part having a cylindrical surface shape and a second rotor magnetic pole part having a salient pole shape and provided offset in the axial direction with respect to the first rotor magnetic pole part. a rotor, a base plate having a first stator magnetic pole part always facing the first rotor magnetic pole part with a gap therebetween, and a second stator magnetic pole facing the second rotor magnetic pole part. In the inductor type signal generator for an internal combustion engine ignition device, the inductor type signal generator for an internal combustion engine ignition device includes an iron core having a section and a signal coil wound thereon, and a permanent magnet provided between the iron core and the base plate. The iron core has a rising portion at an end opposite to the first stator magnetic pole portion, and the iron core includes a first plate portion having the second stator magnetic pole portion at the tip thereof; The signal coil is formed into an L-shape having a second plate-shaped part bent at a substantially right angle from the rear end, and the signal coil is wound around a bobbin, and the bobbin is fitted into the first plate-shaped part of the iron core. The raised part of the base plate is inserted into the cavity provided in the bobbin, the permanent magnet is held between the raised part and the second plate-like part, and the bobbin has a recessed part. Both ends of the signal coil are connected to terminal fittings provided and fitted in the recessed portions, and the bobbin, iron core, permanent magnet, and terminal fittings are integrally molded with a non-magnetic material together with the rising portion of the base plate. An inductor type signal generator for an internal combustion engine ignition system, characterized in that a window for preventing magnetic flux leakage is provided in a portion of the base plate facing the second stator magnetic pole portion.