JPH0240883A - Manufacturing device for brush sliding contact sleeve of rotary electric machine - Google Patents

Abstract

PURPOSE:To improve workability by providing an air release port for a metal mold so that it faces to the peripheral surface of a sliding contact member. CONSTITUTION:An air release hole 11a passing from the inner periphery of the second split mod 11 to its outer periphery, and an air release groove 11b to be connected to the hole are formed, on the outer periphery also an air release groove 13b to be connected to the air groove 11b is formed on the bottom surface of the third split mold. And, these are connected to each other and one end is opened on the outer periphery of a slip ring 4, while the other end is opened toward the outer part of a metal mold 9 so as to release a residual air staying in the metal mold 9 to the outside at the time of injecting resin material. That is, residual air staying in the metal mold 9 can be released from the air release hole 11a through a small gap between a sliding contact ring 6 and the inner periphery of the second split mold 11. In this way, forming of a bur due to an inflow of injected resin material toward the air release hole can be prevented, and workability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for manufacturing a brush contact sleeve for a rotating electric machine such as a generator or a motor.

[Prior art and problems to be solved by the invention] Generally,
Brush contact sleeve for this type of rotating electric machine.

In other words, the slip ring of an alternator, the commutator of a motor, etc. are made of an insulating resin material so that a conductive sliding contact member is integrally provided on the outer periphery, and the molding is performed by setting the sliding contact member. This is done by injecting a resin material into a mold, but it is necessary to provide an air vent to vent the air remaining in the mold when the resin material is injected. However, in the past, this air bleed port was provided at the mating surface of the proportioning molds at the tip of the sleeve, so it was not possible to do so during injection.

The resin material gets into the air vent and becomes flaky, and as a result, a separate process for removing flakes is required after molding, resulting in poor workability and problems.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a manufacturing device for a brush contact sleeve for a rotating electrical machine that can eliminate these drawbacks. In a manufacturing device that molds a brush contact sleeve by injecting an insulating resin material into a mold in which a conductive sliding contact member provided on the outer periphery of the sleeve is preset, air is applied to the mold. When the air vent is provided, the air vent is arranged so as to face the outer circumferential surface of the sliding member.

With this configuration, the present invention eliminates the need for deburring and significantly improves workability.

[Example] Next, an embodiment of the present invention will be explained based on the drawings. In the drawing, 1 is a rotor of an alternator, and the rotor 1 has a rotor coil 3a wound around a rotor shaft 2. The rotor core 3 and the slip ring 4 formed by the manufacturing apparatus of the present invention are integrally fixed in an externally fitted manner.

The slip ring 4 includes a resin part 5 made of an insulating resin material, a sliding ring 6 integrally provided on the outer circumference of the resin part 5, a base end fixed to the sliding ring 6, and - A force tip portion is formed by a terminal 7.8 projecting outward from the outer circumferential portion, and the terminal 7.8 is connected to the rotor coil 3a, and a brush (not shown) is attached to the sliding ring 6 and is pressed against the terminal 7.8. It is designed to make a sliding contact.

On the other hand, reference numeral 9 denotes a mold for a slip ring manufacturing apparatus, and after setting the sliding ring 6 to which terminals 7 and 8 have been attached in advance to the mold 9, the slip ring 4 is made by injecting a resin material. After the above-mentioned molding, the slip ring 4 is machined at its inner and outer circumferential parts to ensure accuracy. It is cut away and divided into two rings 6b and 6C which are insulated from each other.

The mold 9 is fitted onto a first split mold 10 and a second split mold 10 for molding the inner peripheral surface of the slip ring 4 .

A second split mold 11 molds the outer circumferential surface of the slip ring 4, and a rotor core 3 of the slip ring 4 is fitted onto the second split mold 11.
A third split mold 13 for molding the outer circumferential surface of the flange 5a formed at the side end portion, and a fourth split mold 13 for molding the side surface of the slip ring 4 on the rotor core 3 side, which is further provided with an injection port 14a for the resin material. A plurality of split molds such as the mold 14 are assembled on a mold base 15, and a recess 13a for setting the terminal 7.8 is formed at the upper end of the third split mold 13. A convex portion 16a formed on the holding member 16 is fitted into the holding member 16 to hold down the terminal 7.8.

Further, the second split mold 11 has an air vent hole 11a communicating from the inner circumferential surface to the outer circumferential surface, and an air vent groove 11b connected to the air vent hole 11a on the outer circumferential surface.

An air vent groove 13b is formed on the lower surface of the third split mold 13, and is connected to the air vent groove 11b.
On the other hand, the other end is opened toward the outside of the mold 9 during injection of the resin material.

Air remaining in the mold 9 is drawn out to the outside. In other words, the air remaining in the mold 9.

It passes through a small gap between the sliding ring 6 and the inner circumferential surface of the second split mold 11 and is extracted from the air vent hole 11a, and at this time, some resin material enters the gap. Even if this happens, there is no problem because the outer circumferential surface of the slip ring 4 is cut after molding as described above.

On the other hand, the injection port 14a is formed on the lower surface of the quarter die 14 so as to be eccentric in a direction away from both terminals 7.8 with respect to the axis of the slip ring 4. That is,
In plan view, the resin material injected from the injection port 14a is
It flows into a position away from both terminals 7.8 and is divided toward both terminals 7.8, and after each passes through the terminal 7.8 section, it joins on the opposite side of the injection port 14a, and this The weld position where the resin material separated in this way joins is located away from both terminals 7 and 8.

Further, the first split mold 10 is formed to have an elliptical cross section, so that the terminal 7.8 of the slip ring 4 is embedded with a thick wall. In other words, the resin material injected as described above separates and flows toward the terminal 7.8, but the width of the flow path widens at the terminal 7.8, making the flow smoother. between the terminal 7.8 and the second split mold 11, where it is difficult for resin material to flow;
The resin material also actively flows into the gap between the terminal 7.8 and the sliding contact ring 6. still.

The inner circumferential surface of the slip ring 4 formed into an oval shape by the first split die 10 is cut into a perfect circle after molding, as described above.

In the embodiment of the present invention constructed as described above, the mold 9
When the resin material is injected into the mold 9, the air remaining in the mold 9 passes through a small gap between the inner circumferential surface of the second mold 11 and the sliding ring 6 that is preset in the mold 9. , air vent hole 11
It will flow out of the mold 9 from a. Therefore, the resin material injected during molding will not flow into the air vent hole 11a and form a gap, and even if some resin material enters the gap, the outer peripheral surface will remain intact during molding. Since the slip ring 4 will be cut later, there is no need to take the trouble to remove the burr, unlike in the conventional case where the burr is formed on the side surface of the slip ring 4. As a result, the manufacturing process can be simplified and manufacturing workability can be significantly improved.

[Operation and Effect] In summary, since the present invention is constructed as described above, when molding a brush sliding contact sleeve, the air remaining in the mold is removed by the sliding contact member preset in the mold. The air is discharged out of the mold from the air bleed port located opposite to the sleeve. Therefore, it is possible to prevent the injected resin material from flowing into the air bleed port and form a burr. Like the one that protrudes from the resin material part of
There is no need to go to the trouble of deburring, and as a result, the manufacturing process can be simplified and manufacturing workability can be significantly improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the apparatus for manufacturing a brush contact sleeve for a rotating electric machine according to the present invention, in which FIG. 1 is a front view showing a rotor of a generator, and FIG. 2 is a vertical cross-section of a mold. FIG. 3 is a cross-sectional view of the mold showing the flow of the injected resin material, and FIG. 4 is a cross-sectional view of the mold showing the conventional example. In the figure, 4 is a slip ring, 5 is a resin part, 6 is a sliding contact ring, 7.8 is a terminal, 9 is a mold, 11a is an air vent hole, llb, 13b is an air vent groove, and 14a is an injection port. .

Claims (1)

[Claims] In a manufacturing device that molds a brush sliding contact sleeve by injecting an insulating resin material into a mold in which a conductive sliding contact member provided on the outer periphery of the sleeve is preset, an air vent is provided in the mold. 1. An apparatus for manufacturing a brush sliding sleeve for a rotating electrical machine, characterized in that the air vent is arranged so as to face an outer circumferential surface of a sliding contact member.