JPH0516263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ultrasonic welding method for an armature coil and a commutator used in a starter motor for driving an internal combustion engine.

[Prior art]

As shown in Japanese Utility Model Application Publication No. 58-185381, the conventional type has flexibility at the open end of the tip to prevent the underlined part of the armature coil from plastically deforming and expanding during welding. A partition wall is installed.

However, in the above-mentioned conventional device, a separate partition wall is provided at the open end of the chip, which requires an additional number of parts and is expensive, and there are problems with the durability of the chip and the partition wall. be.

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention places the terminal wire of the armature coil on each segment, inserts both tips of the tip into the gap between the adjacent segments of the commutator, and then vibrates the tip. By welding the armature coil to the segment, the aim is to prevent the armature coil from expanding due to plastic deformation without requiring a separate member, making it possible to reduce the cost and improve durability. do.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. As shown in FIGS. 1 to 3, an armature core 2 and a commutator 4 are fixed to the outer periphery of the armature shaft 1. As shown in FIGS. And this commutator 4
is composed of an insulator 6 for insulating from the armature shaft 1, and segments 5 arranged at equal intervals around the outer periphery of the insulator 6. Further, an overlined portion 3a and an underlined portion 3b, which are terminal wires of the armature coil 3 to be welded to the segments 5, are drawn out from the armature core 2.

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
A horn 13 extending in the axial direction is attached to the armature, and a tip 14 extending in the inner diameter direction of the armature is attached to the side of the horn 13 opposite to the vibrator 10. Further, a U-shaped groove 15 having a width approximately equal to the wire diameter of the armature coil 3 is formed on the inner periphery of the tip 14. Furthermore, this groove 1
5 has a wide stepped portion 16 on the inner periphery of the opening end.
At the same time, protrusions 14a are formed at both ends of the tip 14. and stepped portion 16
The height A of the segment 5 is smaller than the height B of the segment 5 discharged from the insulator 6. Also,
The inner diameter C of the stepped portion 16 is approximately the same as the width D of the segment 5 in the circumferential direction. Furthermore, chip 14
The circumferential width E of the protrusion 14a is smaller than the gap F between adjacent segments 5. Both protrusions 14a of the chip 14 fit into the gaps between adjacent segments 5.

Next, the operation of the above configuration will be explained.
The underlined part 3b and the overlined part 3a of the armature coil 3 taken out from the armature core 2 are placed radially on top of each segment 5, with the underlined part 3b and the overlined part 3a
Place it so that it rests on it. Then, using an optical sensor or the like, the segment 5 is positioned in correspondence with the groove 15 of the chip 14. Further, after positioning once, the armature side is rotated by a certain angle depending on the number of segments 5, and the segments 5 are positioned with respect to the chip 14. Thereafter, the U-shaped groove 15 of the chip 14 is placed over the underlined portion 3b and the overlined portion 3a, and a constant pressure is applied in the direction of arrow P shown in FIG. Next, a current is passed through the coil 11 from the ultrasonic generator 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, due to the constant pressure in the center radial direction and vibration in the axial direction, the underlined portion 3b of the armature coil 3 is ultrasonically welded to the segment 5, and the overlined portion 3a
The underlined parts are also ultrasonically welded. Then, the armature side is rotated by a certain angle, and the armature coil 3 is ultrasonically welded to the segment 5 in the same manner as described above.

Further, the deformed portion 3c of the lower layer portion 3b of the armature coil 3 is prevented from expanding by inserting both protrusions 14a of the chip 14 into the gap between the adjacent segments 5, and is accommodated above the segment 5.
It is possible to prevent the deformed portion 3c from spreading to other adjacent segments 5.

Furthermore, since the height A of the stepped portion 16 is smaller than the height B of the segment 5 protruding from the insulator 6, the stepped portion 16 first hits the segment 5 due to the deformation of the armature coil 3, and the chip This prevents the 14 protrusions 14a from coming into contact with the insulator 6.

In addition, in the embodiment described above, the chip 14
A step portion 16 was formed at the inner peripheral opening end of the U-shaped groove 15, but as shown in FIG.
When the circumferential width of the armature coil 3 is approximately equal to the wire diameter of the armature coil 3, the U-shaped groove 15 has a width approximately equal to the circumferential width of the segment 5 of the chip 14.
It is only necessary to provide a step, and there is no need to form a step or the like.

Further, as shown in FIG. 5, a stepped portion 17 may be provided on the outer periphery of the tip of the tip 14, and a tip portion 14b that fits into the gap between adjacent segments may be formed, and the durability of the tip 14 is increased. You can do it like this.

Furthermore, although the stepped portion 16 is formed at the inner peripheral open end of the groove 15 of the chip 14, the stepped portion 16 may be replaced by a tapered shape.

Moreover, although the upper line part 3a and the underline part 3b of the armature coil 3 are arranged vertically in the radial direction, when the wire diameter of the armature coil 3 is small, the upper line part 3a
and the underlined portions 3b are arranged side by side in the circumferential direction,
Ultrasonic welding may also be used.

〔Effect of the invention〕

As described above, in the present invention, the terminal wire of the armature coil is placed on each segment, and both ends of the tip are inserted into the gap between adjacent segments of the commutator, and then the tip is vibrated to Since the coil is welded to the segment, it is possible to prevent the armature coil from coming into contact with another adjacent segment due to the deformation of the armature coil during welding, without requiring a separate member and at low cost. This has the effect of improving durability.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional schematic diagram showing an embodiment of the ultrasonic welding method of the present invention, Figs. 2 and 3 are longitudinal sectional views of essential parts of the above embodiment, and Figs. FIG. 7 is a vertical cross-sectional view of main parts showing another embodiment of the invention. 3... Armature coil, 3a, 3b... Upper and underlined parts forming terminal wires, 4... Commutator, 5... Segment, 10... Magnetostrictive vibrator, 1
DESCRIPTION OF SYMBOLS 1... Coil, 12... Ultrasonic generation power supply device forming a power supply device, 13... Horn, 14... Chip,
15... Groove.

Claims (1)

[Claims] 1 At the tip of a horn that amplifies the vibrations of a magnetostrictive vibrator wrapped around a coil that is energized by a power supply device,
It has a groove for storing the terminal wire of the armature coil,
In addition, using an ultrasonic welding device that fixed a chip with both tips of the grooves entering the gaps between adjacent segments of the commutator, the terminal wire of the armature coil was placed on each segment, and both tips of the tip were fixed to the tip. A method of ultrasonic welding of an armature coil and a commutator, in which a terminal wire of the armature coil is welded to the segment by inserting the chip into a gap between adjacent segments of the commutator and then vibrating the chip.