JPS6130438Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in an armature used in a rotating electric machine such as a starting motor, which is formed by connecting the outlet of an armature coil and a segment of a commutator by ultrasonic welding.

The explanation will be given below based on the figures. FIG. 1 shows a conventional armature. In the figure, 1 is a commutator, 2 is a riserless type segment formed on the outer periphery of this commutator 1, 3 is a V mica attached to the inner periphery of this segment, and 4 is a A sleeve press-fitted into an amateur shaft (not shown), 5 a V ring fitted between this sleeve and the above V mica 3, 6 this V ring, the above V
A locking nut for fixing the segment 2 to the sleeve 4 through the mica 3, 7 a washer, 8 a segment mica for separating the segments 2 in the circumferential direction and insulating each segment, and 9 a heat-resistant phenol. The coil insulator is an annular coil insulator molded from a resin molding material such as a resin or nylon, and a pair of armature coil openings 10 made of rectangular copper wire are connected to a wedge-shaped protrusion 9a from its outer periphery.
It is fitted by press-fitting and tightened in the inner circumferential direction. The armature coil outlet 10 and the segment 2 are electrically and mechanically connected in advance by brazing or pressure welding. It is intended to improve By the way, the above-mentioned conventional coil insulator 9 is installed by being press-fitted mainly into the upper outlet part of the outlet part 10 of the amateur coil made of flat wire. When the coil insulator 9 is connected by ultrasonic welding and the coil insulator 9 is press-fitted into the connected coil outlet, the armature coil outlet is deformed by the pressing force during ultrasonic welding. It has been difficult to press-fit the insulator 9 into the coil outlet.
The above situation will be explained with reference to FIGS. 2 to 4.
In the figure, 11 is an armature shaft, 12 is an armature fitted on this shaft, 13 is an armature coil made of a round wire wound in a slot (not shown) provided in this armature core, and 13a is the above-mentioned armature coil. A pair of outlet portions 14 projecting in the axial direction from each slot of the core 12 is a commutator to which the coil outlet portion 13a is electrically and mechanically connected, and the commutator 14 is fitted onto the shaft 11. It is constructed of a mode material 16 that integrally molds a bush 15 and a plurality of segments 17. 18 is an ultrasonic welding device, 1
9 is a power supply device for this ultrasonic welding device 18, 20 is a Langivin type vibrator, 21 is a PZT (lead zirconium titanate) electrostrictive vibrator, and 22 is a flange with a threaded portion 22a disposed at the end. The electrostrictive vibrator 21 is integrally screwed with a dowel bolt 23, a washer 24, and a spring washer 25 so as to sandwich an electrode 26 therebetween. The electrodes 26 are connected to lead wires 19a and 19b, respectively, and the other end is connected to the power supply device 19 as shown. Further, a horn 28 for amplifying vibration is screwed onto the other end of the flange 22 via a stud bolt 27, and the vibration amplitude amplified by the horn 28 is fixed to the other end of the horn 28. The signal is transmitted to the chip 29. In the ultrasonic welding device 18 having the above configuration, the Langevin-type vibrator 20 ultrasonically vibrates in response to the ultrasonic energy from the power source 19, and the vibration amplitude of the vibration is amplified by the horn 28, and the vibration is transmitted to the chip 29. Therefore, the armature coil outlet part 1 which is the object to be welded
3a is pressurized with a predetermined pressure P and vibrated with ultrasonic vibration F, whereby the armature coil 1
The outlet portion 13a of No. 3 and the segment 17 are solid state welded by frictional energy. Exit portion 13 of amateur coil 13 ultrasonically welded as described above
a and segment 17 are shown in FIG. In the figure, 13b (shaded area in the figure) is an ultrasonic welded part of the armature coil outlet part 13a, and shows a situation in which lateral deformation has occurred. Note that due to the characteristics of the welding method described above, there is almost no deformation of the commutator 14. Therefore, it is difficult to press-fit and fix the coil insulator 9 into the armature coil outlet 13a that has been deformed after welding as in the conventional device. The gap between the coil insulator 9 and the coil insulator 9 becomes larger, and the joint area between them becomes smaller.As the armature rotates, a shift occurs between them, resulting in relative rotation, which increases the resistance to centrifugal force. The disadvantage was that the mechanical strength could not be maintained.

This invention aims to eliminate the above-mentioned drawbacks and provides an excellent amateur as described below.

An embodiment of this invention will be described below with reference to FIGS. 5 to 7.

In the figure, 16a and 17a are a plurality of grooves formed by cutting the side ends of the resin molding material 16 and the segments 17 between the plurality of segments 17, and these grooves are oriented in the axial direction as shown in FIG. It is formed over a range of dimension l or more. 30
1 is an insulating ring made of synthetic resin such as Bakelite with a steel plate metal ring 31 fixed to its outer circumference, and protrusions 32 are formed on its inner circumference to be press-fitted into the grooves 16a and 17a. The commutator 14 surrounds the coil outlet portion 13a. 33 is a powdered thermosetting polymer resin, which connects the insulating ring 30 and the armature coil outlet 13.
A and the segment 17 are filled and fixed, and the structure has good electrical insulation, mechanical (overrun resistance) strength, and heat dissipation characteristics.

In manufacturing the armature constructed in this way, the outer peripheral part of the commutator 14, that is, the resin mold 16 and the side ends of the segments 17 are cut in advance to form grooves 16a and 17a, respectively, and an insulating ring is cut. 30 protrusions 32 are formed so that the diameter formed by their tips is smaller than the diameter formed by the bottom surfaces of the grooves 16a and 17a.

Thereafter, as shown in FIG.
By applying ultrasonic vibration in the direction shown in FIG. After that, the plurality of protrusions 32 on the insulating ring 30 are made to correspond to the plurality of grooves 16a, 17a of the commutator 14, and the insulating ring 30 is
Press fit into the commutator 14 from the right end in the axial direction,
It is arranged so as to surround the connecting portion between the outlet portion 13a and the segment 17. Thereafter, a powder thermosetting polymer resin 33 is filled and fixed in the gap between the insulating ring 30, the commutator 14, and the coil outlet 13a.

That is, in this embodiment, the protrusion 32 of the insulating ring 30 is inserted into the groove 1 of the commutator 14.
6a and 17a, the insulating ring 30 and the commutator 14 will not loosen from each other even if the commutator 14 rotates or vibrations are applied from the outside. Moreover, the insulation ring 3
0, the commutator 14, and the coil outlet 13a are filled and fixed with powdered thermosetting polymer resin 33, so even if the coil outlet 13a is deformed during ultrasonic welding, the commutator 14 Since the coil outlet part 13a and the insulating ring 30 are completely integrated, the mechanical strength is increased, and since the coil outlet part 13a is difficult to separate from the commutator 14, the electrical characteristics are also improved.

Moreover, since a metal ring 31 made of a steel plate is fixed to the outer periphery of the insulating ring 30, the insulating ring 30
Even when external forces and centrifugal force generated when the armature overruns, it does not easily deform or crack, further increasing the mechanical strength of the armature.

In the above description, a metal ring 31 made of a steel plate is fixed to the outer periphery of the insulating ring 30, but the ring 31 may be made of other materials, such as a high tensile strength member such as glass fiber. If physical strength is not required, the metal ring 31 may not be used.

As described above, in this invention, in a device that connects the armature coil outlet and the commutator segment by ultrasonic welding, cutting is performed in the axial direction on the outer periphery of the commutator excluding the connection part with the coil outlet. Since a plurality of concave grooves are formed and the insulating ring that can surround the coil outlet and the commutator is press-fitted and fixed into the concave groove, the insulating ring and the commutator will not loosen from each other. Moreover, since the gap between the insulating ring and the connection part is filled with thermosetting resin, even if the coil exit part deforms during ultrasonic welding, the commutator, the exit part, and the insulating ring will remain thermoset. Since the armature is integrated with a synthetic resin, the mechanical strength in terms of centrifugal force resistance of the armature is increased, and there is an effect that a highly reliable product can be obtained without damage to the armature.

[Brief explanation of the drawing]

Figure 1a is a sectional view showing the main parts of a conventional armature, Figure 1b is a side view showing the main parts of a conventional armature, Figure 2 is a sectional view showing the ultrasonic welding process in a conventional armature, Fig. 3 is a plan view showing the main parts of the armature after the welding process in Fig. 2, Fig. 4 is a cross-sectional view showing the main parts of another conventional armature, and Fig. 5 is a cross-section showing an embodiment of this invention. figure,
Figure 6 is a sectional view taken along the - line in Figure 5, and Figure 7 is a cross-sectional view of Figure 5.
FIG. 3 is a sectional view showing the main parts of the embodiment shown in the figure. In the figure, 11 is an armature shaft, 12 is an armature, 13 is an armature coil, 13a is an outlet, 14 is a commutator, 16 is a molding material, 1
7 is a segment, 16a and 17a are grooves, 18 is an ultrasonic welding device, 30 is an insulating ring, 31 is a metal ring, 32 is a protrusion, and 33 is a powder thermosetting polymer resin. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A commutator that has a plurality of segments divided in the circumferential direction and grooves are formed between these segments in the axial direction, and the plurality of segments are ultrasonically welded. The amateur coil has a plurality of protrusions which protrude inward and are divided in the circumferential direction, and each of these protrusions is connected to the plurality of grooves. An insulating ring press-fitted and attached to surround a connecting part between the segment and the outlet part, and a thermosetting resin filled in a gap between the insulating ring and the connecting part and hardened. Amachiyua. (2) The amateur according to claim 1, wherein the thermosetting resin is a powdered polymer resin. (3) The amateur according to claim 1 of the utility model registration claim, characterized in that a high tension ring is attached to the outer periphery of the insulating ring. (4) The amateur according to claim 3, wherein the high tensile strength ring is made of a steel plate.