JPS63140869A - Manufacture of pickup coil - Google Patents

Abstract

PURPOSE:To reduce the production and storage cost by providing a coil on a bobbin winder section, molding a bobbin case so that the lead line connecting section is protruded to the outside, then assembling other members to it, and holding them with a leaf spring. CONSTITUTION:A thermal 630 is inserted into a bobbin case 610 so that its tip 631 is protruded to the outside, both ends of a coil 300 wound on a bobbin winder section 611 are soldered to the terminal 630, then they are molded with resin 640 to form a coil section 600. An iron core 400, a converging plate 510, a magnet 500, and a fitting member 700 corresponding to the type of the mounting vehicle are arranged in sequence on it, and a leaf spring clip 800 is inserted into a lug 643 to hold individual members. If a pickup coil is thus formed and produced, the mold of the coil section 600 can be coped with one kind for many types of the mounting vehicle, thus the production and storage cost is reduced and the stock control can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a pickup coil that detects the rotational position, rotational angle, etc. of a rotating body.

[Prior Art] A conventional method of manufacturing a pickup coil will be described with reference to FIG. In the first step, the coil 3 is wound around the thread winding section 2 of the bobbin case 1. At the second step, a coil protection thread 4 is wound around the outer periphery of the coil 3 to prevent the coil 3 from loosening. In the third step, an adhesive is applied to the outer periphery of the wound coil protection thread 4 in order to prevent the coil protection thread 4 from loosening. In the fourth step, the coating on the end of the coil 3 is peeled off. In the fifth step, the terminal 7 with the leads l1l16 connected to the terminal mounting parts 5 provided on both sides of the bobbin case 1
Attach. In the sixth step, the end of the coil 3 from which the coating has been peeled is wound around the terminal 7. In the seventh step, the terminal 7 wound around the end of the coil 3 is soldered. In the eighth step, the iron core 9 is inserted into the iron core insertion hole 8 of the bobbin case 1 from the back side (right side in the figure). Then, from the back of the bobbin case 1, a magnetic flux concentrating plate 10 and a magnet 11 are installed.
, the pickup coil mounting members 12 are sequentially arranged, and the ninth
In the process, as shown in FIG. 6, it is provided by molding with injected resin 13.

[Problems to be Solved by the Invention] When a pickup coil is used, for example, to detect the ignition timing of a vehicle, the structure for mounting the pickup coil differs depending on the type of vehicle.
In addition, the pickup coil mounting member 12 must be used in accordance with the vehicle.

However, in the pickup coil manufactured by the conventional manufacturing method, the lead wire 6 and the coil mounting member 12 are molded with resin 13, so the lead wire 6 and the pickup coil mounting member are suitable for the vehicle in which it is used. They were manufacturing pickup coils equipped with 12.

For this reason, conventionally, multiple types of pickup coils are molded, which necessitates multiple molds, increasing manufacturing costs, and complicating inventory management as multiple types of pickup coils are provided depending on the vehicle model. It had problems.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a pickup coil that can be molded for all types using one mold and that is easy to manage inventory.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a coil, a terminal connected to both ends of the coil, an iron core disposed on the inner periphery of the coil, and a terminal connected to both ends of the coil. A bobbin case having a bobbin winding section to be attached, a terminal attachment section to which the terminal is attached, a core insertion hole for arranging the iron core, a magnet magnetically connected to the iron core, and a main body attached to other members. a pick-up coil mounting member for mounting the terminal in the terminal mounting portion, a coil in the bobbin winding portion, and molding the bobbin case so that the lead wire connection portion of the termible protrudes to the outside. The technical means is that a coil portion is formed by molding, and the iron core, the two front magnets, and the pickup coil mounting member are assembled to the coil portion and held by a leaf spring member.

[Function] In the manufacturing method of the present invention, a bobbin case with a coil and a terminal attached thereto is placed inside a mold, and molded with an injected resin to form a coil portion. Next, assemble the iron core, magnet, and pickup coil mounting member to the coil part,
It is completed by holding it with a leaf spring member.

[Effects of the Invention] According to the present invention, after the coil portion is formed, an iron core, a magnet, a pickup coil mounting member, and a lead wire can be attached to the coil portion according to the intended use. There is no need to change the mold in response to changes in the specifications of the magnet, pickup coil mounting member, or lead wire, and the pickup coil can be provided with one mold.

We also stock iron cores, magnets, pickup coil mounting parts, and lead wires with different specifications, and we have iron cores, magnets, pickup coil mounting parts, and lead wires with different specifications.
Since the pickup coil can be created by attaching the pickup coil mounting member and lead wire to the coil section, inventory costs are lower than the conventional method of stocking pickup coils according to specifications, and inventory management is improved. can be facilitated.

[Example] Next, a pickup coil of the present invention will be described based on an example shown in the drawings.

FIG. 1 shows an exploded view of the pickup coil, and FIG. 2 shows a sectional view of the pickup coil.

For example, as shown in FIG. 4, the pickup coil 100 is fixed to the outer circumferential position of the rotor 220 of the power generation unit 210 of the engine 200, and detects a protrusion 221 formed on the rotor 220 by stamping or the like. The rotation angle, rotation speed, etc. of the crankshaft 230 are detected. and,
The detected rotation speed, rotation angle, etc. of the crankshaft 230 are used, for example, as data for controlling ignition timing.

The pickup coil 100 of this embodiment has a coil 300
The winding width in the cylindrical direction of the coil 300 is set to about 11/5 of the total length of the iron core 400, and the distance between the coil 300 and the permanent magnet 500 is set to about 3 of the winding width in the cylindrical direction of the coil 300. The coils 300 are provided at a distance of twice the length, and the center of the coil 300 in the cylindrical direction is provided much closer to the rotor 220 than the center of the iron core 400 in the axial direction.

The coil 300 is wound around the thread winding portion 611 of the bobbin case 610, and then a coil protection thread 620 is wound around the outer periphery thereof.

A pair of terminal insertion holes 612, which are the terminal mounting portion of the present invention, are provided between the bobbin case 610 and the position where the magnet 500 is disposed. A terminal 630 connected to the end of the coil 300 is inserted. In addition, the bobbin case 610 has a bobbin winding portion 611 and a terminal insertion hole 6.
12, the winding start part of the coil 300 is connected to the thread winding part 6.
A groove 613 leading to the inside of 11 is provided.

Further, an iron core insertion hole 614 through which the iron core 400 is inserted is provided inside the bobbin case 610, and the iron core 400 is inserted from the rear surface (the right side in FIG. 1) where the magnet 500 is arranged.

Note that the iron core 400 has a cylindrical shape with a large diameter portion 410 on the rear side, and the large diameter portion 410 is housed in a recess 615 formed on the rear surface of the bobbin case 610.

The bobbin case 610 to which the coil 300, protective thread 6201, terminal 630, etc. are assembled is molded with injected resin 640 so that the lead wire connection portion 631 of the terminal 630 protrudes from the upper end, as shown in FIG. Then, a coil portion 600 is formed. This coil part 600
A recess 641 corresponding to the shape of the magnet 500 is formed on the rear surface of the magnet 500 .

After storing the iron core 400 in the iron core insertion hole 614 of the bobbin case 610, the coil part 600 inserts the magnet 5 into the iron core 400.
A focusing plate 510 that concentrates the magnetic force of 00, and a magnet 500
is stored in the recess 641.

Coil section 60 in which magnet 500 is housed inside recess 641
A pickup coil attachment member 700 is attached to the rear surface of the pickup coil 0. This pickup coil mounting member 700 is
It is formed by bending a substantially T-shaped iron plate, and one end is a groove 642 (see FIG. 3) formed on the front side (left side in FIG. 1) of the lower surface (lower side in FIG. 1) of the coil part 600. ), and the pickup coil mounting member 700 is attached to the coil section 600 by fitting the clip 800 formed of a leaf spring member from the rear surface into the protrusions 643 formed on both sides of the coil section 600. .

In this way, the pickup coil attachment member 700 has both ends of the pickup coil attachment member 700 connected to the coil portion 6.
00, the entire load of the pickup coil 100 can be supported by the pickup coil mounting member 700. In addition, resin contracts when repeatedly exposed to cold and heat, but since the pickup coil mounting member 700 is attached to the resin 640 using the clip 800 of the leaf spring member, the pickup coil mounting member 700 is always supported even if the resin shrinks a little due to long-term use. I can do something.

Further, holes 710 are formed at both ends of the pickup coil mounting member 700, and a screw 720 is inserted through the holes 710.
By screwing the pickup coil 100 onto the crankcase 240 of the engine 200, the pickup coil 100 is attached to the outer periphery of the rotor 220. Furthermore, this pickup coil mounting member 700 includes an iron core 400, a protrusion 221, a rotor 2
20, the magnetic field of the magnet 500 is provided to form a closed magnetic path via the pickup coil mounting member 700.

The clip 800 is attached to the pickup coil mounting member 700
Lead wire 900 connected to terminal 630 at the gate of
support. This lead wire 900 is housed in a terminal connection portion 631 formed at the end of the terminal 430, where the bare wire with the end sheath removed projects from the upper end of the coil portion 600 (upper side in FIG. 1). After that, they are connected by soldering. Note that a varnish dupe 910 is arranged on the outer periphery of the lead wire 900 at the portion supported by the clip 800.
This prevents the lead wire 900 from breaking due to the S movement.

Next, the manufacturing process of the above pickup coil 100 will be explained.

In the first step, a pair of terminals 630 are inserted into a pair of terminal insertion holes 612 of a bobbin case 610. In the second step, the coil 300 is wound around the thread winding portion 611 of the bobbin case 610. In the third step, coil protection thread 620 is wound around the outer periphery of coil 300. In the fourth step, the coil protection thread 6 is wrapped around the outer periphery of the wound coil protection thread 620.
Apply adhesive to prevent 20 from coming loose. In the fifth step,
The coating on the end of the coil 300 is peeled off. In the sixth step, the end of the coil 300 is wound around the terminal 630. In the seventh step, the end of the coil 3000 and the terminal 63G are soldered. In the eighth step, the bobbin case 610@resin 640 with the coil 300, terminal 630, etc. assembled is molded to form the coil portion 600. 9th
In the process, the iron core 400, the focusing plate 510, the magnet 500 . The pickup coil mounting member 700 corresponding to the vehicle type in which it is installed is sequentially inserted into the core insertion hole 614.
and the recess 641, and the clip 800 is placed in the protrusion 6.
43, and the pickup coil 100 is completed.

Note that although the iron core 4 (to) and the focusing plate 510 are inserted into the coil section separately, workability can be improved by fixing the iron core 400 and the focusing plate 510 in advance.

According to the present invention, after the pickup coil 100 is molded, the pickup coil mounting member 700 and the lead wire 900 are attached to the coil portion &0 according to the vehicle type in which it is mounted.
0, there is no need to change the mold depending on the car model, etc. as in the past, and the pickup coil 100 can be installed using only one mold, keeping manufacturing costs low. be able to.

In addition, the pickup coil mounting member 70 according to the vehicle type, etc.
0 and lead wire 900 in stock, and attach the pickup coil mounting member 700 and lead wire 900 to the coil part 600 according to the vehicle model to create the pickup coil 100. Compared to stocking the coil 100, inventory costs are reduced and inventory management becomes easier.

Furthermore, when performing molding, the bobbin case 610
Since the number of parts mounted on the mold is smaller than in the past, it is easy to automate the process up to molding, and automation can reduce the number of steps.

(Modification) Although the above embodiment shows an example in which the terminal mounting portion is provided in the bobbin case between the coil and the magnet, the terminal mounting portion may be provided in other locations such as the top, side, or bottom surface of the coil. It's okay. Further, the winding width of the coil is not limited to that of this embodiment, for example, the coil may be wound over almost the entire area of the iron core.

Although an example is shown in which the coil is wound around the thread winding section, a pre-wound coil may be attached to the thread winding section of the bobbin case.

Although the above-mentioned embodiment shows a method of using V of a pickup coil used for controlling ignition timing, the present invention can also be applied to the manufacture of pickup coils used for other purposes.

[Brief explanation of the drawing]

Figure 1 is an exploded view of the pickup coil, Figure 2 is a sectional view of the pickup coil, Figure 3 is a side view of the pickup coil, Figure 4 is a sectional view of the engine generator with the pickup coil installed, and Figure 4 is a sectional view of the engine generator showing the pickup coil installed. FIG. 5 is an exploded view of a conventional pickup coil, and FIG. 6 is a perspective view of the conventional pickup coil.

Claims (1)

[Claims] 1) A coil, a terminal connected to both ends of the coil, an iron core disposed on the inner periphery of the coil, a pincushion portion to which the coil is attached, and a terminal attachment portion to which the terminal is attached. , a bobbin case having an iron core insertion hole for arranging the iron core, a magnet magnetically connected to the iron core, and a pickup coil attachment member for attaching the main body to another member, and the terminal attachment is provided. attaching the terminal to the bobbin case, providing a coil in the bobbin winding part, molding the bobbin case so that the lead wire connection part of the terminal protrudes to the outside, and forming a coil part in the coil part; A method for manufacturing a pickup coil, characterized in that the iron core, the magnet, and the pickup coil mounting member are assembled and held by a leaf spring member. 2) The method of manufacturing a pickup coil according to claim 1, wherein the lead wire connected to the lead wire connection portion of the terminal is supported by the leaf spring member. 3) The pickup coil mounting member has one end fitted into a groove formed in the coil portion, and the other end attached to the coil portion by the leaf spring member. A method for manufacturing a pickup coil according to item 1 or 2. 4) The first aspect of the present invention is characterized in that the terminal mounting part is provided between the thread winding part and the magnet.
3. A method for manufacturing a pickup coil according to any one of items 1 to 3.