JPH09129107A - Magnet switch for starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet switch increasing the axial size and radial size of coils (hold coil and pull coil), suppressing the manufacturing cost, and stably holding the coils in a yoke over a long period. SOLUTION: The hold coil 13 and the pull coil 14 of a magnet switch 5 are wound by the series regular winding method around a brass sleeve 16 via no resin bobbin. The coils 13, 14 are compressed and held between the bottom section 11 a of a yoke 11 and a fixed iron core 12 via an insulating ring 21 and insulating paper 22 on both sides. Since there is no bobbin and no coil exciting means, the axial and radial spaces surrounded by the yoke 11, fixed iron core 12, and sleeve 16 are increased, and the axial size and radial size of the coils 13, 14 are increased. Since there is no resin bobbin, the number of part items and assembling man-hours are reduced, and the cost can be suppressed. There is no resin bobbin deterioration, and the coils 13, 14 are stably held in the yoke 11 over a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for generating a displacement force for meshing a pinion of a starter for starting an engine with a ring gear of the engine and energizing a starter motor after the pinion meshes with the ring gear. It relates to a magnet switch.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional starter magnet switch is provided with a bottomed cylindrical yoke 102 through which a plunger shaft 101 is inserted, and a stator core 103 that closes the opening of the yoke 102. , York 102
The coil 104 (hold coil and pull coil) is arranged in the space between the bottom portion 102a and the stator core 103 and has the following configuration.

(A) In the conventional coil 104, a coil wire whose outer periphery is covered with an insulating film is randomly wound around the outer periphery of a bobbin 105 made of a thermoplastic resin. Further, one end of the coil wire is connected to one flange 105 of the bobbin 105.
It is connected to the stator core 103 through a hole provided in a, and the other end is connected to a load side terminal of a key switch (not shown).

(B) Also, the bottom portion 102a of the yoke 102.
Between the other flange 105b of the bobbin 105,
The disc spring 106 is arranged, and the bobbin 105 is attached to the stator core 1.
The coil 104 is provided so as not to move within the space between the bottom portion 102a of the yoke 102 and the stator core 103 by being biased toward the 03 side.

(C) Further, on the inner circumference of the bobbin 105,
A seamless tubular sleeve 107 made of a non-magnetic metal is arranged, and even when the resin bobbin 105 is melted by high heat, the melted resin is prevented from adhering to the plunger shaft 101, and the plunger shaft 101 is It is provided to prevent the problem of fixing with molten resin.

[0006]

However, in the conventional starter magnet switch, the coil 10 in the magnet switch is used in order to move the engine in a short time.
4 (hold coil and pull coil) needs to flow a large current, and it is conceivable to adopt a resin having high heat resistance so that the bobbin 105 made of resin is not damaged by the heat generated in the coil 104. Even if it is adopted, the bobbin 105 is repeatedly subjected to heat due to long-term use of the starter and gradually deteriorates in creep, so that the axial length of the bobbin 105 becomes shorter and the yoke 1
02 and the bobbin 105 arranged between the disc spring 106
However, the bobbin 105 cannot be pressed against the stator core 103, the bobbin 105 vibrates in the yoke 102, and the coil 1
There is a risk that the coil wire for connecting from 04 to the stator core 103 may be broken.

[0007]

SUMMARY OF THE INVENTION The present invention has been made under the above circumstances, and an object thereof is to provide a starter magnet switch in which a coil is stably held in a yoke even when used for a long period of time. It is in.

[0008]

[Means for Solving the Problems]

[Means of Claim 1] By adopting the means of Claim 1, in the starter magnet switch, the coil wire is wound around the outer circumference of the sleeve made of a non-magnetic material and made of metal without interposing a bobbin. Coil formed by
Since it was arranged between the bottom of the bottomed cylindrical yoke and the stator core that closes the opening of this yoke, and compressed and sandwiched,
Due to the elastic force of the coil itself that is aligned and wound, the coil is firmly held between the bottom of the yoke and the stator core, and even after long-term use, the bobbin creep-deteriorates as in the past, and the coil The problem that the holding force of is reduced in the yoke does not occur. That is, it is possible to prevent the coil from being stably held in the yoke, vibrating in the yoke, and breaking the lead wire of the coil.

[Means for Claim 2] According to the means for claim 2, since an insulator having a small thermal deformation is arranged at least between the coil and the bottom of the yoke or between the coil and the stator core, The problem of creep deterioration of the insulator against heat generated when the coil is energized is suppressed, the coil does not move axially in the yoke due to vibration, and the lead wire of the coil does not break. .

[Means for Claim 3] According to the means for claim 3, the sleeve is made of a conductive metal, and the tip end portion of the coil wire wound around the outer periphery of the sleeve is engaged with the protruding engagement portion of the sleeve. By doing so, the insulating film of the coil wire is peeled off, and the coil wire can be grounded through the sleeve. Therefore, it is not necessary to secure an axial space for guiding the winding start end of the coil to the outer circumference of the bobbin as in the conventional case, and the work of the winding process can be shortened.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a magnet switch for a starter according to the present invention will be described based on an embodiment shown in the drawings. [Structure of Embodiment] FIGS. 1 to 5 show an embodiment adopting the present invention. FIG. 1 is a sectional view of a magnet switch for a starter, and FIG. 2 is a schematic view of a starter.

The starter 1 is a device for engaging a pinion 3 with a ring gear 2 connected to a crankshaft of an engine and energizing a starter motor 4 to start the engine.
A magnet switch 5 is provided which generates a displacement force for meshing the pinion 3 with the ring gear 2 of the engine and energizes the starter motor 4 after the pinion 3 is displaced toward the ring gear 2 side.

The magnet switch 5 includes a magnet portion 6 for generating a displacement force for engaging the pinion 3 with the ring gear 2 of the engine, and a switch portion 7 for energizing the starter motor 4 after the pinion 3 is displaced toward the ring gear 2 side. Consists of.

The magnet portion 6 mainly includes a cylindrical yoke 11 having a bottom portion 11a, a stator core 12 for closing an opening portion of the yoke 11, and a bottom portion 11a of the yoke 11 and the stator core 12. A cylindrical hold coil 13 and a pull coil 14 arranged in the space, and a plunger shaft 1 slidably arranged in the axial direction on the inner circumference thereof.
And 5. The yoke 11 has a bottom portion 11a.
The tubular portion and the tubular portion do not necessarily have to be integrally formed, and the bottom portion 11a and the tubular portion are formed as separate members.
You may connect a and a cylindrical part by joining means, such as welding.

The yoke 11 is made of a magnetic metal (for example, low carbon steel) processed into a bottomed cylindrical shape by cold forging or the like, and a hole 11b for inserting the plunger shaft 15 is provided at the center of the bottom 11a. ing. The stator core 12 is made of magnetic metal (for example, iron) processed into a ring plate shape by cold forging or the like. ) Tube part 1 protruding to
2b. In addition, the yoke 11 and the stator core 12
Is grounded to the vehicle body via a starter housing (not shown).

The hold coil 13 is a non-magnetic material mounted around the cylindrical portion 12b of the stator core 12 and is made of a conductive metal (for example, brass, copper, aluminum, etc.) which is drawn into a cylindrical shape without a joint. A coil wire with an insulating coating is directly wound around the outer circumference of the sleeve 16 in an aligned winding and provided in a tubular shape. One end (winding start end portion 13a) of the coil wire of the hold coil 13 is Electrically and mechanically connected to the ends.

Specifically, at the rear end of the sleeve 16, as shown in FIGS. 3 to 5, a projecting engagement portion 16a for hooking and locking the winding start end portion 13a of the hold coil 13.
(FIG. 3 shows a winding engaging hole, and FIG. 4 shows a winding engaging groove), and the hold coil 13 is cut and raised in the protruding engaging portion 16a.
By hooking the winding start end 13a, part of the coating of the conductive wire is peeled off, the winding start end 13a of the hold coil 13 and the sleeve 16 are electrically connected, and the winding start of the hold coil 13 is started. The end portion 13a and the sleeve 16 are mechanically fixed. In addition,
The other end of the hold coil 13 (winding end 13b) is
As shown in FIG. 2, it is connected to a vehicle-mounted battery 18 via a starter switch 17.

The pull coil 14 is a coil wire having an insulating coating directly wound around the hold coil 13 in an aligned winding. One end 14a of the pull coil 14 is connected to a battery 18 via a starter switch 17. The other end 14b is connected to the starter motor 4.

Here, the assembling of the hold coil 13 and the pull coil 14 will be described. First, the sleeve 16 in which the winding start end 13a of the hold coil 13 is hooked by the protruding engagement portion 16a is attached to the outer periphery of the cylindrical portion 12b of the stator core 12, and the insulating ring 21 is fitted to the outer periphery thereof. The insulating ring 21 is, for example, a thermosetting resin (phenol resin as a specific example) that secures insulation between the hold coil 13 and the pull coil 14 and the stator core 12, and is a recess that houses the protruding engagement portion 16a. And has a thickness in the axial dimension of the protruding engagement portion 16a (which can be reduced to the diameter of the conductive wire).

Next, a regulating plate (not shown) for regulating the front ends of the hold coil 13 and the pull coil 14 is arranged on the front end side of the sleeve 16. Here, the distance between the regulation plate and the insulating ring 21 is set to be slightly larger than the distance between the insulating ring 21 and the insulating paper 22 when the hold coil 13 and the pull coil 14 are assembled in the yoke 11. Then, the hold coil 13 is wound around the outer circumference of the sleeve 16 a predetermined number of times. After that, hold coil 1
The pull coil 14 is wound around the outer circumference of the sheet 3 in a predetermined number of times by aligning winding.

The above-mentioned aligned winding means the sleeve 1
The first layer of the hold coil 13 wound around the outer periphery of 6 is wound at least in an orderly manner, and the second and subsequent layers may be wound in an orderly manner like the first layer. You may be taken.

Next, the regulating plate is removed from the sleeve 16 around which the hold coil 13 and the pull coil 14 are wound, and a ring-shaped insulating paper 22 is attached to the front ends of the hold coil 13 and the pull coil 14. Although the insulating paper 22 is used in this embodiment, a thermosetting resin which is the same material as the insulating ring 21 may be used. Then, the hold coil 13 and the pull coil 14 are inserted into the yoke 11, and the yoke 11 and the stator core 12 are fixed while the hold coil 13 and the pull coil 14 are compressed. The yoke 11 and the stator core 12 are fixed by mounting the front end of the switch cap 24 (described later) on the rear surface of the stator core 12 via the packing 23 and then moving the rear end portion 11c of the yoke 11 inward. It is made by crimping.

The plunger shaft 15 includes a sleeve 16
It is a rod-shaped magnetic metal (for example, iron) that is disposed slidably in the axial direction inside, and is provided with an engagement protrusion 15a that is engaged with the shift lever 25 at the front end. Further, the plunger shaft 15 is biased forward by the return spring 26, and when the suction of the plunger shaft 15 by the hold coil 13 is stopped, the plunger shaft 15
Is provided so as to return to the front. The return spring 26 is mounted between the rear surface of the step 15b provided at the intermediate position of the plunger shaft 15 and the front surface of the cylindrical portion 12b of the stator core 12.

The switch portion 7 is provided at the rear portion of the magnet portion 6, and is provided with a movable contact 31 provided at the rear end of the plunger shaft 15 and a switch cap 24 forming a chamber for accommodating the movable contact 31. It is composed of two fixed contacts 32 and 33 fixed to the switch cap 24.

The movable contact 31 is a metal plate having a small electric resistance, such as copper, and two insulating washers 34 mounted on a small diameter portion 15c formed on the rear side of the plunger shaft 15,
It is sandwiched and held by 35. These insulating washers 34, 3
5 is held slidably in the axial direction with respect to the small diameter portion 15c, and is prevented from coming off by a retaining ring 36 attached to the rear end of the plunger shaft 15.

The movable contact 31 is the contact spring 3
It is urged rearward by 7. The contact spring 37 is mounted between the rear surface of the step 15 d provided on the rear side of the plunger shaft 15 and the insulating washer 34. Since the movable contact 31 is held at the rear portion of the plunger shaft 15 in this way, even if the movable shaft 31 moves further rearward while the movable contact 31 is in contact with the fixed contacts 32 and 33, the movable contact 31 does not move.
The plunger shaft 15 can move rearward while being in contact with the fixed contacts 32 and 33.

The switch cap 24 is a cap made of a thermosetting insulating resin material such as phenol resin,
As described above, the packing 2 is provided on the rear surface of the stator core 12.
The front end of the switch cap 24 is attached via the connector 3, and the rear end portion 11c of the yoke 11 is attached by caulking inward.

The two fixed contacts 32 and 33 correspond to the movable contact 3
When 1 is moved rearward, it is a terminal such as copper that conducts through the movable contact 31 and is provided with bolts 32a and 33a penetrating the switch cap 24, respectively, and washers 38 and 39 mounted from the outside of the switch cap 24. It is fixed to the switch cap 24 by. Note that one fixed contact 32 is connected to the battery 18 as shown in FIG. 2, and the other fixed contact 33 is connected to the other end 14b of the pull coil 14 and the starter motor 4.

[Operation of Embodiment] Next, the operation of the above embodiment will be described. When the starter switch 17 is turned on, the hold coil 13 and the pull coil 14 are both energized, and the plunger shaft 15 is attracted backward. Then, the shift lever 2 locked at the front end of the plunger shaft 15
5 rotates, the pinion 3 is pushed out to the ring gear 2 side by the shift lever 25, and the pinion 3 moves to the ring gear 2
Abut. Then, the plunger shaft 15 moves further rearward, and the movable contact 31 at the rear end of the plunger shaft 15 contacts the two fixed contacts 32 and 33.

Then, the starter motor 4 is energized via the movable contact 31 to rotationally drive the pinion 3. The rotation of the pinion 3 causes the pinion 3 to mesh with the ring gear 2, and the rotation of the pinion 3 drives the ring gear 2 to crank the crankshaft of the engine.
When the starter motor 4 is energized, the pull coil 14 is de-energized by the movable contact 31, and the magnetic force of the hold coil 13 keeps the plunger shaft 15 attracted.

The engine starts and the starter switch 17
When is turned off, the magnetic force generated by the hold coil 13 disappears, and the return spring 26 returns the plunger shaft 15 to the front. Then, the shift lever 25
Pulls back the pinion 3, and the pinion 3 separates from the ring gear 2. At the same time, the movable contact 31 is replaced by the fixed contacts 32, 33.
When the starter motor 4 is turned off, the energization of the starter motor 4 is stopped and the rotation of the pinion 3 is stopped. That is, the starter 1 stops.

[Effects of Embodiment] In the magnet switch 5 of this embodiment, the pull coil 14 and the hold coil 13 are aligned and wound without interposing a bobbin around the outer circumference of the sleeve 16 which is a non-magnetic material and is made of metal. Since the wound pull coil 14 and the hold coil 13 are compressed and sandwiched between the bottom portion 11a of the yoke 11 and the stator core 12 that closes the opening of the yoke 11, the pull coil 14 and the hold coil that are aligned and wound. Due to the elastic force of 13 itself, the pull coil 14 and the hold coil 13 move to the yoke 11
It is firmly held between the bottom portion 11a and the stator core 12, and the pull coil 14 and the hold coil 13 are stably held in the yoke 11 even when used for a long period of time.

Furthermore, even if it is used for a long period of time, unlike the conventional case, the problem that the holding force of the winding is lowered in the yoke 11 due to the creep deterioration of the resin bobbin does not occur. That is,
The pull coil 14 and the hold coil 13 are stably held in the yoke 11, and the pull coil 14 and the hold coil 1
It is possible to eliminate the problem that the lead wire 3 of the pull coil 14 and the hold coil 13 is disconnected due to the vibration of 3 in the yoke 11.

Further, at both ends of the pull coil 14 and the hold coil 13 in the axial direction, the two flanges of the bobbin do not exist, but the insulating ring 21 and the insulating paper 22 exist instead.
Since the insulating ring 21 can be thinned to the diameter of the conductive wire, the insulating paper 22 is also extremely thin, and the thickness of the insulating ring 21 + the thickness of the insulating paper 22 is thinner than the two flanges of the bobbin. The space size in the axial direction of the hold coil 13 and the pull coil 14 can be made larger than in the conventional case.

Further, the pull coil 14 and the hold coil 1
Since 3 is wound around the outer circumference of the sleeve 16, the bobbin that has been conventionally used can be eliminated. Therefore, the thickness of the tubular portion of the bobbin is eliminated, and the radial coilable dimensions of the pull coil 14 and the hold coil 13 are Larger than conventional ones. That is, the entire magnet switch 5 can be downsized.

As described above, since the axial and radial dimensions of the pull coil 14 and the hold coil 13 are increased as compared with the conventional one, the pull coil 14 and the hold coil 1 are
The magnetic force generated by No. 3 can be increased as compared with the conventional one.

Further, the pull coil 1 is provided on the outer circumference of the sleeve 16.
4 and the hold coil 13 are wound, the conventional bobbin can be eliminated between the pull coil 14 and the hold coil 13 and the sleeve 16, and only the sleeve 16 is provided between the pull coil 14 and the hold coil 13 and the plunger shaft 15. It has a single-layer structure.

Therefore, the number of parts of the starter magnet switch 5 can be reduced as compared with the conventional one, and the number of assembling steps of the starter magnet switch 5 can be reduced, and as a result, the starter magnet switch 5 can be reduced. It is possible to keep the manufacturing cost of the device low compared to the conventional one.

Further, between the pull coil 14 and the hold coil 13 and the bottom portion 11a of the yoke 11, and between the pull coil 14 and the hold coil 13 and the stator core 12, an insulator having a small thermal deformation, that is, an insulating ring is provided. 21 and the insulating paper 22 are arranged, the pull coil 14
Also, the thin insulating ring 21 and the insulating paper 22 do not undergo creep deterioration due to heat generated when the hold coil 13 is energized, and even if creep deterioration occurs, it is very small. Does not move in the yoke 11 in the axial direction.

Further, the sleeve 16 is made of a conductive metal, and the winding start end portion 13a of the tip of the hold coil 13 wound around the outer circumference of the sleeve 16 is engaged with the protruding engagement portion 16a of the sleeve 16. Since the insulating film of the hold coil 13 is peeled off and can be grounded via the sleeve 16, it is not necessary to purposely ground the tip end of the hold coil 13 via the stator core 12 as in the conventional case. Therefore, the hold coil 1
It is not necessary to secure an axial space for guiding the winding start end portion 13a of 3 to the outer circumference of the bobbin as in the conventional case, and the work of the winding process can be shortened.

[Modification] In the above embodiment, the yoke 11 is used.
Two coils inside (hold coil 13 and pull coil 1
However, the present invention may be applied to the magnet switch 5 in which only one coil is housed in the yoke 11.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a magnet switch (example).

FIG. 2 is a schematic view of a starter (Example).

FIG. 3 is a perspective view showing a protruding engagement portion (embodiment).

FIG. 4 is a perspective view showing a protruding engagement portion (example).

FIG. 5 is a cross-sectional view of a protruding engagement portion (embodiment).

FIG. 6 is a cross-sectional view of a magnet switch (prior art).

[Explanation of symbols]

 1 Starter 5 Magnet Switch 11 Yoke 11a Bottom of Yoke 12 Stator Iron Core 13 Hold Coil 14 Pull Coil 15 Plunger Shaft 16 Sleeve 16a Projection Engagement Part 21 Insulating Ring (Insulator with Less Thermal Deformation) 22 Insulating Paper (Insulation with Less Thermal Deformation) body)

Claims (3)

[Claims] 1. A yoke made of a cylindrical magnetic material having a bottom portion, and a coil wire which is arranged on the inner circumference of the yoke and generates an electromotive force when energized, and whose outer circumference is covered with an insulating film. A coil formed by winding in a tubular shape, a stator core made of a magnetic material that closes the opening of the yoke, and arranged between the bottom of the yoke and the stator core and inside the coil. Together with the tubular shape,
A starter magnet switch comprising a non-magnetic sleeve made of metal and a plunger shaft that is arranged in contact with the inner circumference of the sleeve and is made of a magnetic body that is slidable in the axial direction in the sleeve. The starter is characterized in that the coil is provided in such a manner that the coil wire is aligned and wound around an outer periphery of the sleeve, and is compressed and sandwiched between a bottom portion of the yoke and the stator core. Magnet switch for. 2. The starter magnet switch according to claim 1, wherein an insulator having a small thermal deformation is arranged at least between the coil and the bottom of the yoke or between the coil and the stator core. Characteristic magnetic switch for starter. 3. The starter magnet switch according to claim 1, wherein the sleeve is made of a conductive metal, and the tip end portion of the coil wire is engaged with a protruding engagement portion provided on the sleeve. A magnet switch for a starter, wherein an insulating film of the coil wire is peeled off and the coil wire is grounded via the sleeve.