JPH0516265B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an armature used in a starter motor or the like that drives an internal combustion engine.

[Prior art]

In the conventional type, the lower wire of the armature coil is placed on top of the commutator segment, and the upper wire is placed and connected on top of this lower wire.

In addition, as shown in Japanese Patent Application Laid-open No. 56-98361,
The upper and lower wires of the armature coils are connected in parallel on the same surface of the segment.

However, in the conventional method described above, the upper wire and lower wire of the armature coil are arranged vertically in the radial direction on the segment and connected, so the welding strength between the segment and the upper wire and the lower wire is reduced. It has the disadvantage of being

In addition, since the upper and lower wires of the armature coil are connected in parallel to the segments, it is possible to increase the welding strength between the segments and the upper and lower wires. In order to prevent leakage, it is necessary to insert an insulating member between the upper wire and the lower wire, which has the disadvantage that this separate member is required and additional man-hours are required for inserting the member.

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention provides a step in the circumferential direction of the armature core side of the commutator segment, connects the upper wire of the armature coil to the side with the higher step, and connects the armature coil to the side with the lower step. By connecting the lower wires, we have created a structure in which rare formation between the upper and lower wires is less likely to occur, so there is no need for separate parts, no increase in man-hours, and it is possible to connect the segments to the upper and lower lines. The purpose is to increase the welding strength of

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. As shown in FIGS. 1 to 4, an armature core 2 and a commutator 4 are fixed to the outer periphery of the armature shaft 1 in proximity to the armature core 2. The commutator 4 is composed of an insulator 6 for insulating the armature shaft 1 and a plurality of segments 5 arranged in a cylindrical shape at equal intervals around the outer periphery of the insulator 6. Also,
A U-shaped groove 5a having approximately the same width as the wire diameter of the armature coil 3 and a depth larger than the wire diameter is formed in half of the outer circumferential surface 2b of each segment 5 at the end on the armature core 2 side. It is formed in the direction. A step having a height larger than the wire diameter of the armature coil 3 is formed on the segment 5 by the outer peripheral surface 5b and the groove 5a. Furthermore, an armature coil 3 is wound around each slot of the armature core 2, and an upper wire 3a and a lower wire 3b of the armature coil 3 are drawn out from the armature core 2. Then, each upper line 3a and each lower line 3b drawn out from different slots are arranged on the same each segment 5 of the commutator 4, and
The lower line 3b is inserted into the groove 5a of the segment 5 (the side with the lower level difference), and the upper line 3a is inserted into the outer peripheral surface 5b of the segment 5 where the groove 5a is not formed (the side with the higher level difference).
connected above. Further, each upper line 3a and each lower line 3b cross each other with a gap 7 interposed therebetween.

In the ultrasonic welding device, a coil 11 wound around the magnetostrictive vibrator 10 is connected to an ultrasonic generation power supply device 12. and magnetostrictive vibrator 10
Horn 1 extends in the axial direction and amplifies ultrasonic vibrations.
3 is attached, and the anti-vibrator 1 of this horn 13
A tip 14 extending in the direction of the inner diameter of the armature is attached to the zero side. And each upper line 3a,
One ultrasonic welding device is used for each lower line 3b.

Next, the operation of the above configuration will be explained.
The upper wire 3a and the lower wire 3b of the armature coil 3 taken out from the armature core 2 are arranged in parallel on the outer circumferential surface 5b of the segment 5 and in the groove 5a at different levels, respectively. Then, using an optical sensor or the like, the segments 5 are positioned in correspondence with each chip 14. Also, after positioning once,
Depending on the number of segments 5, the armature side is rotated by a certain angle to position the segments 5 relative to each chip 14. Then, using two ultrasonic welding devices, the tips 14 are brought into contact with the lower wire 3b and the upper wire 3a, respectively, and a constant pressure is applied in the direction of the arrow p shown in FIG. Thereafter, a current is applied to the coil 11 from the ultrasonic generating power supply device 12 to give vibration to the magnetostrictive vibrator 10. Via the horn 13, the chip 14 is vibrated in the direction of arrow F shown in FIG. Therefore, the upper wire 3a and the lower wire 3b of the armature coil 3 are ultrasonically welded to the segment 5 by the constant pressure in the center radial direction and the vibration in the axial direction. Then, the armature side is rotated by a certain angle, and the upper wire 3a and lower wire 3b of the armature coil 3 are ultrasonically welded to the segment 5 in the same manner as described above.

In addition, since the chips 14 of the two ultrasonic welding devices have the same ultrasonic vibration in opposite phases, the ultrasonic vibrations are canceled out in opposite phases, and the segments 5
does not vibrate, the segment 5 can be prevented from separating from the insulator 6, and the upper wire 3a and lower wire 3b of each armature coil 3 can be connected independently.
Since it is welded, stable ultrasonic welding can be performed. and a lower line 3b is arranged on the segment 5, an upper line 3a is arranged on this lower line 3b,
In the case of ultrasonic welding, the ultrasonic vibrations are transmitted to the segments 5 via the upper wire 3a and the lower wire 3b, so the vibration of the lower wire 3b is weakened, and the adhesive force between the lower wire 3b and the segment 5 is weakened. However, in the embodiment described above, since the ultrasonic vibrations are transmitted to the upper wire 3a and the lower wire 3b, a stronger welding force can be obtained.

Furthermore, the upper line 3a and the lower line 3b are provided with a step in the segment 5, and the outer circumferential surface of the segment 5 is
Since the upper wire 3a is placed in b and the lower wire 3b is placed in the groove 5a having a depth larger than the wire diameter of the armature coil 3, there is a gap 7 between the upper wire 3a and the lower wire 3b.
Because of this, the insulating coating formed on the armature coil 3 can be peeled off due to contact between the upper wire 3a and the lower wire 3b due to vibrations during welding and external (for example, internal combustion engine) vibrations. , it is possible to prevent the upper wire 3a and the lower wire 3b from becoming rare (short circuit).

In the above-mentioned embodiment, the groove 5a is provided in the segment 5 to form a step, but as shown in FIG. Then, connect the upper wire 3a onto this protrusion 5c, and connect the outer peripheral surface 5d.
Even if the lower line 3b is connected to the lower line 3b, the same effect as in the above embodiment can be obtained. A step is formed by the outer circumferential surface 5d and the protrusion 5c.

Further, as shown in FIG. 5, a first U-shaped groove 5e and a second U-shaped groove 5f having different depths are formed at the end of the segment 5 on the side of the armature core 2. Even if the upper line 3a is connected to the shallow first groove 5e and the lower line 3b is connected to the deeper second groove 5f, the same effect as in the above embodiment can be obtained. A step is formed by the first groove 5e and the second groove 5f.

Further, as shown in FIG. 6, a first protrusion 5g and a second protrusion 5h having different heights are formed at the end of the segment 5 on the side of the armature core 2, so that the first protrusion 5g and the second protrusion 5h having different heights are formed. Even if the upper wire 3a is connected to the portion 5g and the lower wire 3b is connected to the lower second protrusion 5h, the same effect as in the above embodiment can be obtained. A step is formed by the first protrusion 5g and the second protrusion 5h.

Furthermore, although the height of the step on the segment 5 is greater than the wire diameter of the armature coil 3, even if the step is the same as or slightly smaller than the wire diameter of the armature coil 3, the upper wire 3a and the lower wire 3b are connected in parallel, the generation of rare between the upper wire 3a and the lower wire 3b can be reduced.

When the segment 5 and the insulator 6 are firmly fixed, the chips 14 of the two ultrasonic welding devices are vibrated with the same ultrasonic vibration in opposite phases, but even if they are in the same phase, It is possible to reduce the occurrence of rare occurrences.

In addition, if two ultrasonic welding devices are not used and the segment 5 and the insulator 6 are firmly attached, as shown in FIG. Stepped portion 14 on segment 5 side
a, and the top line 3 on one chip 14.
a, connect the lower line 3b to segment 5, so
Only one ultrasonic welding device is required.

Furthermore, not only when using ultrasonic welding, but also when connecting armature coils to segments using methods such as fusing and brazing, a gap is provided between the upper and lower wires, so when welding Even if the insulation coating of the armature coil conductor deteriorates, stretches, or deforms due to heat, or if the upper and lower wires vibrate due to external vibrations, it prevents leakage between the upper and lower wires. can do. and,
Since the upper line and lower line are connected in parallel on the segment, the bonding area between the upper line and the segment increases, and stronger welding force is achieved than when the upper line and lower line are bonded vertically to the segment. Obtainable.

〔Effect of the invention〕

As described above, in the present invention, the commutator segment is provided with a step in the circumferential direction at the end on the armature core side, the upper wire of the armature coil is connected to the higher side of this step, and the upper wire of the armature coil is connected to the lower side of the step. Since the lower wire of the armature coil is connected, the part where the upper wire and the lower wire cross will be less likely to be pressed together, and a separate member that can reduce the occurrence of rare between the upper wire and the lower wire is also required. Moreover, there is an excellent effect that the number of man-hours is not increased, and the welding strength between the segment and the upper line and the lower line can be increased.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional schematic configuration diagram showing the essential parts of an embodiment of the armature of the present invention during ultrasonic welding;
FIG. 2 is an enlarged cross-sectional view showing the main parts of the above embodiment;
FIG. 3 is a plan view showing the main parts of the above embodiment, FIG. 4 is a vertical sectional view showing the main parts of the above embodiment, and FIGS. 5 to 8 are main parts of other embodiments of the armature of the present invention. FIG. 1... Armature shaft, 2... Armature core, 3... Armature coil, 3a... Upper line, 3b... Lower line, 4... Commutator, 5... Segment, 5a, 5b, 5c, 5d, 5e, 5f,
5g, 5h... Groove, outer circumferential surface, protrusion, outer circumferential surface, first groove, second groove, first protrusion forming the step,
Second protrusion.

Claims (1)

[Claims] 1. An armature core fixed to the outer periphery of the armature shaft, a commutator fixed to the outer periphery of the armature shaft and having a plurality of segments arranged on the outer periphery, and an armature coil attached to the armature core and connected to each of the segments. each segment has a step in the circumferential direction at the end on the armature core side, an upper line is connected to the higher side of the step, and a lower line is connected to the lower side of the step. Connected armature.