JPH089578A - Starter motor - Google Patents

Abstract

(57) [Summary] [Purpose] A motor for a starter can be made compact not only in the radial direction but also in the axial direction. [Structure] Input side lead-out terminal 5a of field coil 5
Is connected to the power supply lead wire 11 via the first connecting wire 8a,
The output side output terminal 5b is connected to the brush 2 via the second connecting line 8b, and both the input side output terminal 5a and the output side output terminal 5b and the first connecting line 8a and the second connecting line 8b are connected to the brush 2 side. Withdraw. Inner peripheral side output terminals 5A of both the input side output terminal 5a and the output side output terminal 5b are housed in a circumferential groove 3A formed on the inner periphery of the brush 3 side of the yoke 3 from the opening end of the yoke 3 to the pole core 4. , The outer peripheral side lead end 5B, the first terminal connecting wire 8a and the second terminal connecting wire 8b between the inner peripheral wall 3C of the circumferential groove 3A and the virtual cylindrical surface P defined by the yoke radial direction inner diameter portion 5C of the field coil 5. Place in between.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter motor, and more particularly to a starter motor suitable for compactness.

[0002]

2. Description of the Related Art Generally, a starter motor includes an armature, a brush for supplying electric power to the armature, a cylindrical yoke surrounding the armature, and a plurality of yokes arranged on the inner peripheral surface of the yoke at regular intervals in the circumferential direction. Of pole cores, a plurality of field coils formed by winding a conductor around each pole core, and a power supply lead wire for supplying power to the plurality of field coils. When power is supplied from the power supply lead wire and the field coil is energized, the electric circuits of the brush and the armature coil are closed, and then the magnetic circuits of the pole core, the armature core and the yoke are closed.
As a result, a torque is generated by the predetermined magnetic circuit constant and electric circuit constant, and the motor rotates.

Among the starter motors having the above-described structure, the starter motor with a reduction mechanism having a particularly small diameter has an inner peripheral side (winding start) and an outer peripheral side (starting winding) of the field coil from the viewpoint of reliability and compactness. (End of winding) The layout between the lead terminal and the power supply lead wire and the armature and the yoke is important for commercialization.

As a conventional starter motor with a reduction mechanism, which can be made compact while ensuring reliability, there is one disclosed in Japanese Utility Model Laid-Open No. 63-109550. In this conventional technique, a circumferential groove is formed on the brush-side inner circumference of the yoke from the opening end of the yoke to the pole core.
Of the inner circumference side and the outer circumference side output terminals, the output side output terminal connected to the brush is pulled out to the brush side, and the inner circumference side output terminal is housed in the circumferential groove together with the pulling portion, so that the radial direction It is possible to reduce the diameter.

[0005]

However, in the above-mentioned prior art, although the arrangement structure of the output side output terminal of the input side or the output side output terminal of the field coil is taken into consideration, it is connected to the power supply lead wire. There is no special description about the input side output terminal, and in this case, the input side output terminal is arranged on the side opposite to the brush of the yoke, which causes a problem that the shaft length of the motor becomes long. Also, since a bare wire is used as the conductor of the field coil, it is necessary to further insulate it by varnishing after assembling the coil. For this varnishing, the end of the power supply lead wire must be placed away from the field coil. However, also in this respect, there is a problem that the axial length becomes long.

An object of the present invention is to provide a starter motor which can be made compact in size not only in the radial direction but also in the axial direction.

[0007]

The starter motor of the present invention adopts the following constitution in order to achieve the above object. That is, an armature, a brush that supplies power to the armature, a cylindrical yoke that surrounds the armature, a plurality of pole cores that are arranged on the inner peripheral surface of the yoke at a constant interval in the circumferential direction, and the pole core. A plurality of field coils formed by winding a conductor around each of the plurality of field coils and a power supply lead wire for supplying power to the plurality of field coils, and the input side of the inner and outer circumference side output terminals of the plurality of field coils. The output terminal is connected to the power supply lead wire, the output side output terminal is connected to the brush, and a circumferential groove is formed in the inner circumference of the yoke of the yoke on the brush side from the yoke opening end to the pole core. The lead-out terminal was pulled out to the brush side, and the lead-out terminal on the inner circumference side thereof was housed in the circumferential groove together with the lead-out portion. In the tarter motor, the input side output terminals of the plurality of field coils are drawn out to the brush side and connected to the power supply lead wire via a first connecting wire, and the output side output terminal drawn out to the brush side is connected to the brush side. Connected to the brush via two connecting wires, and housing the inner circumference side output terminals of both the input side and the output side output terminals together with the drawer portion in the circumferential groove, and at the same time, the input side and the output side output terminals. Both of the outer peripheral side output terminals of the terminal and the first and second connecting wires are provided within the axial length of the circumferential groove by the inner circumferential wall of the circumferential groove and the inner diameter portion of the field coil in the radial direction of the yoke. The configuration is such that it is arranged between the specified virtual cylindrical surface.

In the starter motor, preferably, the conductor forming the field coil is a conductor insulated from each other by an insulator, and the first connecting wire is arranged closer to the field coil than the second connecting wire. The connection terminal of the power supply lead wire to the first connecting wire is the first
The structure is arranged on the side of the field coil with respect to the connecting line.

Further, in the starter motor, preferably, the power supply lead wire is taken out through an insulating bush attached to the yoke.

[0010]

In the starter motor of the present invention configured as described above, both the input side and the output side output terminals of the field coil are pulled out to the brush side, and the inner peripheral side output terminals of both the input side and the output side output terminals are drawn out. The terminal is housed in the circumferential groove of the yoke together with the lead-out portion, and the outer peripheral side output terminals of both the input side and the output side output terminals and the first and second connecting wires are connected to the inner peripheral wall of the circumferential groove and the yoke of the field coil. By arranging between the virtual coil surface defined by the inner diameter portion in the radial direction and the virtual coil surface, the gap between the field coil and the armature is determined without being influenced by the positions of the input side and output side output terminals. The diameter can be small and both the input side and output side output terminals and the first and second
By arranging the connecting wires on the same brush side and within substantially the axial length of the circumferential groove, the axial length of the motor can be shortened and the motor can be made compact.

Further, by making the conductors forming the field coil mutually insulated by an insulator,
After the coil is assembled, it is not necessary to insulate it by varnishing, so the connection terminal with the first connecting wire of the power supply lead wire
It can be arranged on the side of the field coil with respect to the connecting line, whereby the axial length of the motor can be further shortened, and further compactification can be achieved.

Further, by taking out the power supply lead wire to the outside through the insulating bush attached to the yoke,
A part of the connection terminal for connecting the power supply lead wire to the first connecting wire is located in the circumferential groove, which enables further downsizing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, the starter motor of the present embodiment is a DC series-wound electric motor, includes an armature 1 having a coil and a core, and a commutator 1a is provided on one end side of the armature 1 and the commutator 1a Armature 1 around
A brush 2 for supplying electric power is arranged. The other end of the armature 1 is connected to a starter pinion clutch mechanism via a speed reducing mechanism (not shown). A cylindrical yoke 3 is located on the outer peripheral side of the armature 1 so as to surround the armature 1. Four pole cores 4 having a bevel 4A are arranged on the inner peripheral surface of the yoke 3, and a circumferential groove 3A is formed on the inner periphery of the yoke 3 on the brush 2 side from the opening end of the yoke 3 to the pole core 4. Also,
As shown in FIG. 3, a recess 3B is opened at the end of the yoke 3 on the brush 2 side, and an insulating bush 13 as shown in FIG. 1 is attached to the recess 3B. A screw hole 6a into which a pole core tightening screw 6 for attaching the pole core 4 is inserted is formed in the center of the yoke 3. As shown in phantom lines in FIG. 4, the pole cores 4 are arranged at regular intervals in the circumferential direction.
In each of the fields, the field coil 5 as shown in FIG.
Is wound. As shown in FIG. 6, the field coil 5 is formed by winding conductors that are insulated from each other by an insulator 7. For example, the field coil 5 is an aromatic polyamide nonwoven fabric as disclosed in Japanese Patent Publication No. 62-55685. An insulated conductor is wound and assembled into a conductor coil, and then a solvent is applied and dried to fix the space between the coils. The yoke 3, the pole core 4, and the field coil 5 are assembled by attaching the pole core 4 and the field coil 5 to the yoke 3 and tightening the pole core 4 with the pole core tightening screw 6. As shown in FIGS. 6 and 7, when the pole core 4 is tightened until it comes into contact with the inner peripheral surface of the inner diameter D1 of the yoke 3, at the same time, the field coil 5 is pushed up in the outer peripheral direction by the bevel 4A of the pole core 4. The field coil 5 also comes into close contact with the inner peripheral surface of the inner diameter D1, and the field coil 5 is fixed between the bevel 4A portion of the pole core 4 and the yoke 3.

The field coil 5 is, as shown in FIG.
It has an inner circumference side lead-out terminal 5A at the beginning of winding and an outer circumference side lead-out terminal 5B at the end of winding, and one of the inner circumference side lead-out terminal 5A and the outer circumference side lead-out terminal 5B becomes the input side lead-out terminal 5a.
It is connected to the power supply lead wire 11 via the connecting wire 8a, the other is the output side output terminal 5b, and is connected to the brush lead wire 12 via the second connecting wire 8b. In the four field coils 5, the inner-side output terminal 5A and the outer-side output terminal 5B are alternately the input-side output terminal 5a and the output-side output terminal 5b, as shown in FIG.

The input side output terminal 5a and the output side output terminal 5b of each field coil 5 are, as shown in FIG.
Both are drawn out to the brush 2 side, and the first connecting line 8a and the second connecting line 8b are inside the circumferential groove 3A of the yoke 3 and
The connecting wire 8a is arranged so as to be located closer to the field coil 5 than the second connecting wire 8b. Further, as shown in FIG. 6, the inner peripheral side output terminals 5A of both the input side output terminal 5a and the output side output terminal 5b are housed in the circumferential groove 3A together with the drawer portion. The circumferential groove 3A has a portion having an axial length L and an inner diameter D2, and also has a portion located inside the end of the pole core 4 by L *, and in this L * portion, the position is not constant when tightened. The coil 5 is allowed to move, and a gap is secured for electrically connecting the inner circumference side output terminal 5A.

Outer peripheral side output terminals 5B of both the input side output terminal 5a and the output side output terminal 5b and the first connecting line 8a.
As shown in FIG. 9, the second connecting line 8b and the second connecting line 8b are circumferential grooves 3A.
Is disposed between the inner peripheral wall 3C and the virtual cylindrical surface P defined by the inner diameter portion 5C of the field coil 5 in the yoke radial direction.
As a result, a gap G is created between the armature 1 and the field coil 5. This gap G is not affected by the positions of the input side output terminal 5a and the output side output terminal 5b of the field coil 5, and the optimum thickness T3 of the bevel 4A of the pole core 4 can be determined from the output characteristics of the motor. There is an advantage that the material plate thickness T of the coil 5 can be freely set as long as it can be stored in the circumferential groove 3A.

Returning to FIG. 1, the portion of the connection terminal 11A of the power supply lead wire 11 connecting to the first connecting wire 8a is attached to an insulating bush 13 made of rubber or the like so as to be located closer to the field coil 5 than the first connecting wire 8a. The power supply lead wire 11 is taken out to the outside through the insulating bush 13. Further, the bare wire portion of the power supply lead wire 11 up to the welded portion with the first connecting wire 8a is insulated by the insulating bush 13.
It is housed and held within the axial length L of the circumferential groove 3A.

In the starter motor configured as described above, when power is supplied from the power supply lead wire 11, the first connecting line 8a, the input side output terminal 5a, the output side output terminal 5b, the second connecting line 8b and The brush lead wire 12 is energized, grounded by the coils of the brush 2 and the armature 1, and the electric circuit is closed. Next, pole core 4 and armature 1
The magnetic circuit of the core and the yoke 3 is closed, and a torque is generated by a predetermined magnetic circuit constant and electric circuit constant, and the motor rotates. At this time, the positions of the input-side lead-out terminal 5a and the output-side lead-out terminal 5b are the same as those of the yoke 3 on the armature 1 side.
Even on the side, the predetermined performance is not affected. Also, power supply lead wire 1
Regarding the arrangement of the connection terminal 11A with the first first connecting line 8a, there is no influence on the predetermined performance either on the field coil 5 side or on the non-field coil 5 side of the first connecting line 8a. Also,
Since the yoke 3 is usually magnetically unsaturated, the circumferential groove 3
There is little change in performance due to A.

According to the starter motor of this embodiment as described above, the following effects can be obtained. That is, the input side output terminal 5a and the output side output terminal 5 of the field coil 5 are
Both of b are pulled out to the brush 2 side, and the input side output terminal 5
a and the output side lead-out terminal 5b, both inner circumference side lead-out terminals 5A are housed in the circumferential groove 3A together with the drawer portion thereof, and both the input-side lead-out terminal 5a and the output-side lead-out terminal 5b are provided. By arranging the first connecting wire 8a and the second connecting wire 8b between the inner peripheral wall 3C of the circumferential groove 3A and the virtual cylindrical surface P defined by the yoke radial direction inner diameter portion 5C of the field coil 5, the field coil Since the gap G between the armature 1 and the armature 1 is determined without being influenced by the positions of the input side output terminal 5a and the output side output terminal 5b, the motor can have a small diameter and the input side output terminal 5a and the output can be obtained. Both the side lead-out terminals 5b and the first connecting wire 8a and the second connecting wire 8b are provided on the same brush side with the circumferential groove 3
By arranging the motor within the axial length L of A, the axial length of the motor can be shortened and the motor can be made compact.

Since the conductors forming the field coil 5 are insulated from each other by the insulator 7, it is not necessary to insulate the conductors by varnishing after assembling the coils. Therefore, the first connecting wire of the power supply lead wire 11 is not required. The connection terminal 11A for connecting with 8a can be arranged closer to the field coil 5 side than the first connecting wire 8a, whereby the axial length of the motor can be further shortened and further downsizing can be achieved.

Further, by taking out the power supply lead wire 11 to the outside via the insulating bush 13 attached to the yoke 3, a part of the connection terminal 11A with the first connecting wire 8a of the power supply lead wire 11 is part of the yoke 3. Since it is located in the circumferential groove 3A, it becomes possible to make it further compact.

Although the four pole cores 4 are arranged in the present embodiment, the number of pole cores 4 can be increased if necessary. Also, the first connecting line 8a
Is arranged on the side of the field coil 5 with respect to the second connecting line 8b, but conversely, the structure of arranging the second connecting line 8b on the side of the field coil 5 with respect to the first connecting line 8a is substantially the same. The effect of is obtained.

[0023]

According to the present invention, the field coil has an imaginary cylindrical surface defined by the inner peripheral wall of the circumferential groove and the inner diameter portion of the field coil in the radial direction of the yoke within substantially the axial length of the circumferential groove of the yoke. Since the motor is made to have a small diameter, the shaft length of the motor can be shortened, and the motor can be made compact.

[Brief description of drawings]

FIG. 1 is a detailed partial cross-sectional view of a starter motor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the starter motor shown in FIG.

FIG. 3 is a top view of a yoke of the starter motor shown in FIG.

FIG. 4 is a front view of an electric input / output unit of the starter motor shown in FIG.

5 is a side view of an electric input / output unit of the starter motor shown in FIG.

FIG. 6 is an enlarged view of a main part of FIG.

7 is a sectional view taken along line VII-VII of FIG.

8 is an electrical input / output connection diagram of the starter motor shown in FIG.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 1 Armature 2 Brush 3 Yoke 3A Circumferential Groove 3C Inner Wall 4 Pole Core 5 Field Coil 5a Input Side Output Terminal 5b Output Side Output Terminal 5A Inner Side Output Terminal 5B Outer Side Output Terminal 5C Yoke Radial Inner Diameter Section 7 Insulator 8a No. 1 terminal connecting wire 8b 2nd terminal connecting wire 11 power lead wire 11A connecting terminal 13 insulating bush

Front page continuation (72) Inventor Norito Hasebe 2520 Takaba, Katsuta City, Ibaraki Prefecture Hitachi, Ltd. Automotive Equipment Division

Claims (3)

[Claims] 1. An armature, a brush for supplying power to the armature, a cylindrical yoke surrounding the armature, and a plurality of pole cores arranged on the inner peripheral surface of the yoke at regular intervals in the circumferential direction. , A plurality of field coils formed by winding a conductor around each of the pole cores, and a power supply lead wire for supplying power to the plurality of field coils. Of which, the input side output terminal is connected to the power supply lead wire, the output side output terminal is connected to the brush, and a circumferential groove is formed from the yoke opening end to the pole core in the brush side inner circumference of the yoke, The output side output terminal is pulled out to the brush side, and the inner circumference side output terminal is housed in the circumferential groove together with the pull-out portion. In the starter motor, the input side output terminals of the plurality of field coils are drawn out to the brush side and connected to the power supply lead wire via a first connecting wire, and the output side output terminal drawn out to the brush side is The input side and the output side are connected to the brush via a second connecting line, and the inner peripheral side output terminals of both the input side and the output side output terminals are housed in the circumferential groove together with the drawer portion. The outer peripheral side output terminals of both the output terminals and the first and second connecting lines are within substantially the axial length of the circumferential groove, and the inner peripheral wall of the circumferential groove and the inner diameter portion of the field coil in the radial direction of the yoke. A starter motor characterized in that it is arranged between a virtual cylindrical surface defined by 1. 2. The starter motor according to claim 1, wherein the conductor forming the field coil is a conductor insulated from each other by an insulator, and the first connecting wire is more than the second connecting wire. The connection terminal of the power supply lead wire with the first connection wire
A starter motor arranged on the side of the field coil with respect to the connecting line. 3. The starter motor according to claim 2, wherein the power supply lead wire is taken out through an insulating bush attached to the yoke.