JPH0422037A - Electromagnetic switch device - Google Patents

Abstract

PURPOSE:To facilitate assembly by connecting a terminal bolt to the end part extended to the outer periphery of an excitation coil through the extension of a conductor part from a contact part of a fixed contact in a shaft direction, so as to draw the terminal bolt in a radius direction, and by burying a pair of fixed contacts into an insulating member in an integrated manner, and thereby fixing it, so as to fix the insulating material to the rear end of a magnetic path iron core. CONSTITUTION:A conductor part 61a of one fixed contact 61 buried in an insulating member 64 is extended in a shaft direction, and a terminal bolt 63 is connected to the end part thereof, while a conductor part 62a of the other fixed contact 62 is extended further in a shaft direction, and reaches a brush holder 41, and the lead of a brush 42 is connected by a fastening screw 43. The insulating member 64 is mounted by drawing a mounting bolt in a hole 64b for bolt, and by screwing the bolt at the rear end of a magnetic path case 55. An O-ring 74 is fitted in the outer circumference of the insulating member 64 as a guide, and, after the ring is abutted on the rear end of the magnetic path case 55, the fitting part on the front end of a cover 72 is fitted in the fitting part on the rear end of the magnetic path case 55, and they are thus bonded with each other. The assembly can thus be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an electromagnetic switch device for a starter of an internal combustion engine. , is a sectional view of a main part of a conventional electromagnetic switch device for a coaxial starter. Number 1 indicates a coaxial starter, and number 1 indicates a DC motor, which is configured as follows. 2 is a yoke,
3 is a field pole attached to the inner periphery of the yoke 2; the figure shows the case of a permanent magnet; 04I/i is a rear bracket on which a brush holder 5 is attached. 6 is an armature, which includes a hollow armature rotating shaft 7, an armature core 8 fixed to this rotating shaft 7, an armature coil 9 attached to this armature core, and a rotating shaft 7.
and a commutator 10 fixed to the armature filter 9 and connected to the armature filter 9. The rear end of the rotating shaft 7 is supported by the rear bracket 4 via a bearing 11, and the front end side is supported via a bearing (both not shown) by a bearing support portion integrally formed at the front end of the yoke.

Reference numeral 13 denotes a front bracket connected to the yoke 2, which is connected to a planetary gear reduction device connected to a binion (sun gear) formed on the outer diameter of the front end of the rotating shaft 7, and an output rotating body of this reduction device. It also has a built-in overrunning clutch (not shown).

Reference numeral 15 designates an output rotating shaft whose rear end side is supported within the rotating shaft 7 via a sleeve bearing 16, and is connected to the clutch inner of the overrunning clutch by a helical spline in the middle, and rotation is transmitted to the front end. The splined binion 17 is rotated. Binion 1
7 is moved forward by the forward movement of the output rotating shaft 15, and engages with a ring gear (not shown) of the engine for starting rotation.

Next, 2o is an electromagnetic switch device coaxially coupled to the rear side (play side) of the DC motor 1, and is configured as follows. Reference numeral 21 denotes an excitation coil wound around the bobbin 22, 23 a fixed iron core applied to the front end of the bobbin 22, and 24 a guide bushing 25 made of a non-magnetic material fitted to the inner periphery of the bobbin 22 and fixed to the fixed iron core 23. is made of a magnetic material, and the outer periphery of the exciting coil 21 is surrounded by a magnetic path case attached to the bracket 4, which forms a magnetic path iron core, and the fixed iron core 23 is fixed inside Ir1Ja. A movable core 26 faces the fixed core 23 and is supported within a guide bushing so as to be able to move freely in the axial direction, and forms a grunger. 38 is a compression spring for returning the movable iron core 26, 27 is a push rod whose rear end is supported by the coil spring 28 within the movable iron core 26, and whose front end presses Im of the output rotating shaft 15 via a steel ball 29. .

Reference numeral 30 designates a pair of fixed contacts embedded in a pair of insulating members 31 made of synthetic resin, each with terminal bolt portions 30a and 30b exposed to the outside.
A lead wire from a power source (storage battery) is connected to the terminal bolt portion 30b, and a lead wire 32 to the brush device is connected by a nut 33 to the terminal bolt portion 30b.

34 is possible @P on the rear extension of iron core 26! Rim body 35a, 3
The movable contact 36 is supported via the movable iron core 2 and corresponds to the rear (left side in the figure) of the fixed contact 30.
A coil spring inserted between the 6th end and the insulator 35a,
A movable contact 34 is provided with a contact. A cover 37 is made of a non-magnetic material and is attached to the rear end of the magnetic path case 25.

The operation of the coaxial starter combined with the conventional electromagnetic switch device 2o is as follows. When the engine starting switch is turned on, the excitation coil 21 is energized and the movable iron core 2
6 is attracted to the fixed iron core 23. As a result, the push rod 27 moves forward and the output rotating shaft 15 moves forward, causing the pinion 1 to move forward.
7 to mesh with the ring gear of the engine. At the same time, the movable contact 34 contacts both fixed contacts 30 to close the circuit to the armature coil 9 and energize it, causing the armature 6 to start and rotate. The rotation of the armature rotation @7 is reduced by the planetary gear reduction device,
The signal is transmitted from the output rotating shaft 15 to the pinion 17 via the overrunning clutch, and starts the engine. The terminal bolt part 30 from the fixed contact 30 is located on the rear end side of the magnetic path core on the fixed side.
a and 30b had to be made to protrude in the radial direction at the rear end side of the magnetic path core. If the terminal bolt parts 30a and 30b protrude to this extent, depending on the engine, it may become an obstruction when installing the starter to the engine, or it may cause problems when wiring the lead wire from the power supply. There was a problem. 1, the pair of fixed contacts 30 are each embedded in a separate e-recording member 31, and there is a problem in that it is troublesome to assemble them into the magnetic path core.

Furthermore, a terminal bolt portion 30a is provided on the rear end side of the magnetic path core.

301), the outer shape was elongated in the axial direction.

This invention was made to solve these problems, and in the case where the fixed contact and the movable contact are arranged at the rear of the magnetic path core, the terminal bolt from the fixed contact is connected to the outer periphery of the exciting coil. An electromagnetic switch device that can be easily installed in the radial direction at the front of the fixed core, eliminates obstacles when installing to the engine, facilitates the insulated installation of the fixed contact to the magnetic path core, and shortens the external length. The purpose is to obtain.

[Means to solve the problem]

The electromagnetic switch device according to the present invention arranges the fixed contact and the movable main point behind the magnetic path core, prevents metal powder from entering between the movable core and the fixed core due to the opening of the contact, and prevents the metal powder from entering between the movable core and the fixed core. In a device that eliminates the hindrance to swing motion, both fixed contacts are embedded in a single insulating member, this insulating member is fixed to the rear end of the magnetic path core, and the conductor extending in the axial direction from the fixed contact is excited. A terminal bolt is passed through the outer periphery of the coil and connected to the end of this conductor portion, and extends in the radial direction at the outer periphery of the exciting coil or in front of the fixed core.

[Effect]

In this invention, the fixed contact and the movable contact are arranged on the rear end side of the magnetic path core, and the conductor part of the pair of fixed contacts extends in the axial direction from the contact part. The insulating member is embedded in the integral P22 member, and this insulating member is fixed to the rear end of the magnetic path iron core, allowing the fixed contact to be easily assembled. be done.

Therefore, the terminal bolt can be easily pulled out in the radial direction from the outer periphery of the excitation coil or a portion of the fixed iron core.

〔Example〕

112th! J is a longitudinal cross-sectional view of an electromagnetic switch device according to a first embodiment of the present invention, showing the case where it is applied to a coaxial starter. In the figure, the angles 1 to 3.6 to 10.15 degrees 16 are the same as those of the conventional device described above, and the explanation thereof will be omitted. 40 is a rear bracket attached to the yoke 2, 41 is a brush holder attached to the rear bracket 40, and a brush box 41a
is insulated and supported, and a brush 42 is inserted. In addition,
The brush holder 41 may be integrally formed of a synthetic resin material.

Reference numeral 50 denotes an electromagnetic switch device coaxially coupled to the rear side of the DC motor 1, and is configured as follows.

51 is an excitation coil wound around the bobbin 52, 53 is a fixed iron core applied to the front end of the bobbin 52, and 54 is the bobbin 52.
A guide bushing 55 made of a non-magnetic material is fitted into the inner bowl and fixed to the fixed iron core 53. The guide bushing 55 is made of a magnetic material and surrounds the outer periphery of the excitation coil 51. After that, a magnetic path case stained with the bracket 40 forms a magnetic path iron core. , a fixed iron core 53 is fixed within the ml end. 56 is a ciJ#J which faces the fixed iron core 53 and is supported within the guide pulley 54 so as to be freely movable in the axial direction.
The iron core forms the plunger. 57 is a support rod that is firmly fixed in the moving iron core 56 and pushed out to the rear. 58 is made of a non-magnetic material, and is press-fitted and fixed to the moving iron core 56 and pushed out to the front, reaching the hollow part of the armature rotation @7. The hollow rod 59 has its rear end supported movably in the axial direction within the hollow rod 58, and the coil is a pushing rod pressed by the screw 60, which presses the rear end of the output rotating shaft 15 through the steel ball 29 with m1Ji. ing. 6
Reference numerals 1 and 62 denote a pair of fixed contacts disposed at the rear end of the magnetic path case 55, each of which is formed in an L-shape with a radial contact portion and axial conductor portions 61a and 62a.
a and 62a pass around the outer periphery of the excitation coil 51. 6
4 is an insulating member made of a synthetic resin molded product with fixed contacts 61 and 62 embedded therein, and is fixed to the rear end of the magnetic path case 55. A terminal bolt 63 is passed through the end of the conductor portion 61a of the fixed contact 61, extends out in the radial direction, penetrates the magnetic path case 55 via the e side member 65, and is tightened with a nut 66. The terminal bolt 63 is connected to a glue from the power source side (storage battery). Conductor portion 62a of fixed contact 62
The end of the brush holder 41 is placed against the receiving part 41b,
The lead wire of the brush 42 is connected by a tightening screw 43. 44 is a rubber gear luff fitted into a hole drilled in the rear bracket 40. 67 are fixed contacts 61 and 62
The support bar 57 is supported by the support rod 57 for axial movement at the movable U contact point corresponding to the outer end of the support rod 57, and an acid supply contact plate 69 is fitted between it and the end of the movable iron core 56. It is being 70
The retaining ring 71 fitted to the end of the support rod 57 and the insulating support 6
A compression spring fitted between the movable contact 6 and the movable contact 6 provides a contact. The cover 2 is made of a non-magnetic material and is attached to the magnetic path case 55 74. F5 is the 0 ring.

Next, a bearing 73 is fixed to the inner periphery of the protrusion 53a of the fixed iron core 53 and supports the rear end of the rotating shaft γ.

The insulating member 64 in which the fixed connection A61.62 is embedded is
As shown in the figure. The outer periphery of the insulating member 64 is circular. Conductor portion 6 of one fixed contact 61 embedded in insulating member 64
1a extends in the axial direction, and a terminal bolt 63 is connected to the end. The upper part 62a of the other fixed contact 62 is extended by -1 (turn) in the axial direction, and reaches the 441st part of the brush poem.
The lead wire of the brush 42 is connected by a tightening screw 43. Note that this connection may be made by press-fitting a terminal of a pincer connected to the edge of the lead of the brush 42 into the end of the conductor portion 62a. 64a is a hole through which the excitation coil 51 is inserted. The insulating member 64 is attached by passing a bolt (not shown) through the bolt hole 64b and tightening the screw to the rear end of the magnetic path case 55.

Note that the jlb2 peak member 64 may be attached to the magnetic path case 55 by grommets, caulking, or the like.

The connection portion of the E cover 72 to the magnetic path case 55 is shown in the third row. As shown in FIG. 3(a), an O-ring 74 is fitted on the outer circumference of the insulating member 64 as a guide, and the magnetic path case 55
Next, as shown in FIG. 3 (111), the fitting part at the front end of the cover 72 is fitted into the fitting part at the rear end of the i-way case 55. In this way, waterproofing is achieved by the 1-way compression of the 0-ring 74. In this way, the 0 ring 74 is l! Using the outer circumferential portion of the edge member 64 as a guide, it is fitted axially between the magnetic path case 55 and the case 72, making it easy to assemble.

In addition, according to the four-stage structure in which the O-ring is compressed and assembled in the radial direction between the ends of the magnetic path case 55 and the case 72, the O-ring becomes jammed in the radial direction during assembly, which is not preferable.

Said cover 72. Magnetic path case 55. Flk bracket 4
0. The yoke 2 and the front bracket 13 are connected by means of tightening the W4 retractable members with bolts (not shown). Alternatively, insert a through bolt (not shown) from the cover 72 into the magnetic path case 55. Rear bracket 40 and yoke 2
It may also be done by screwing it through the fftT bracket 13.

In the device of the above embodiment, when the excitation coil 51 is energized, the movable iron core 56 is attracted to the fixed iron core 53, the push rod 59 is advanced lσ via the coil spring 60, and the output rotation @15 is advanced and the pinion 17 (the fourth (Reference)) is engaged with the engine's ring gear.

At the same time, the movable contact 67 contacts the fixed contacts 61 and 62,
%1hj= is applied to the child coil 9, ti F, and the child 6 is rotated.

Accordingly, the rotation of the rotary shaft 7 rotates the binion 17 in the same manner as in the conventional starter described above, and starts the engine.

When the magnetic coil 51 is passed through once, the output rotating shaft 15 is returned to the retracted position by a return spring (not shown), and the i''I moving iron core 56 is also returned to the retracted position.

In addition, in the above implementation row, the magnetic path case 55 is connected to the excitation coil 5.
1 to form a magnetic path iron core and also serve as a case, enclose the outer periphery and rear end of the excitation coil 51, and enclose the outer periphery of the magnetic path iron core connected to the fixed iron core 53. ) 40 and the case coupled between the cover 72 and the cover 72 may be separate.

Further, in the above embodiment, the case where the present invention is applied to a coaxial type starter is shown, but the present invention is not limited to this, and the present invention can also be applied to a case where the present invention is arranged in parallel with four electric parts. In this case, separate the terminal bolts from the conductor parts from each fixed contact.

〔Effect of the invention〕

As shown in F below, in this invention (according to this invention), in a device in which a fixed contact and a movable contact are disposed on the suction side of a magnetic path core, four body parts are extended in the axial direction from the sliding point of the fixed contact and excitation is performed. It was passed around the outer circumference of the coil, a terminal bolt was connected to the end of this conductor part and extended in the radial direction, a pair of fixed contacts were embedded and fixed in the integrated IP and edge member, and the insulating member was fixed to the core of the magnetic path core. Therefore, the pair of fixed contacts are insulated and supported by the magnetic path core by simple means, and assembly is facilitated.

Further, the conductor portion is bent in the axial direction from the contact portion of the fixed contact and extended to the outer periphery of the excitation coil, so that the external length is shortened compared to the conventional device.

In addition, the outer circumference of the insulating member is made circular, and QIJ is applied to this outer circumference.
The O-ring can be easily installed by connecting the O-ring in the axial direction between the rear end of the case that surrounds the excitation coil section and the front end of the cover, making it possible to easily install the O-ring and ensure that the contact cable is waterproof. It is highly applied.

[Brief explanation of drawings]

The first example is a longitudinal cross-sectional view of an electromagnetic switch device according to an embodiment of the present invention applied to a coaxial starter. (
-) and (1)) are O between the magnetic path case and cover in Figure 1.
FIG. 4 is a cross-sectional view showing the assembly of the ring in order. FIG. 4 is a front view in cross-section of the main part of a coaxial starter showing a conventional electromagnetic switch device. 1... DC motor, 50... Electromagnetic switch device, 5
1... Excitation coil, 52... Bobbin, 53... Fixed iron core, 55... Magnetic path iron core (magnetic path case), 56...
・Movable iron core, 61° 62...Fixed contact, 61a, 62
a... Conductor portion, 63... Terminal bolt, 64... Insulating member, 67... Movable contact, 68... Insulating support, 72... Kano (-74... Ring) , The same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) An excitation coil wound around a bobbin, a fixed core that surrounds the front end of this excitation coil, a magnetic path core that surrounds the rear end and outer circumference of the excitation coil and is connected to the fixed core, and a rear end of this magnetic path core. a pair of fixed contacts fixed via an insulating member to the bobbin, a movable core forming a plunger that is supported movably in the axial direction on the inner diameter side of the bobbin, faces the fixed core, and is attracted and moved forward by excitation; In an electromagnetic switch device having a movable contact that is insulated and supported at the rear of the movable core, faces both of the fixed contacts, and closes both of the fixed contacts as the movable core moves forward, the fixed contact is a radial contact portion. The conductor part passes around the outer periphery of the excitation coil, and a terminal bolt for power supply is connected to the end of this conductor part and extends in the radial direction, and the insulating member has a pair of fixed contacts. An electromagnetic switch device characterized by embedded holding. (2) The outer periphery of the excitation coil section is surrounded by a case, and the front end of the cover surrounding the contact chamber is connected to the rear end of the case. The outer periphery of the insulating member is circular, and 2. The electromagnetic switch device according to claim 1, wherein an O-ring is fitted and the O-ring is axially clamped between the rear end of the case and the front end of the cover for waterproof sealing.