JP4561094B2 - Motor inlay and molding method thereof - Google Patents

Description

  The present invention relates to an inlay provided on a bracket of a motor for attaching accessory parts such as an encoder and a brake, and a molding method thereof.

Motor accessories include encoders and brakes to detect the rotational position and speed, but these accessories require high mounting accuracy with the motor's rotating shaft in order to achieve specified performance. Is done. For this purpose, an inlay is formed on the bracket of the motor, and the accessory is attached based on the inlay.
As a conventional bracket inlay of a motor, for example, there is one disclosed in Patent Document 1.
The structure is shown in FIG. 3 and FIG. 3A is a sectional view of the motor, FIG. 3B is a front view of the bracket, and FIG. 4 is a sectional view showing a mold structure for forming a mold resin. In the figure, 21 is a stator, 22 is a stator core, 23 is a coil, 24 is an anti-load side bracket, 25 is a load side bracket, 26 is a mold resin filled between the stator 21 and the bracket 24, 27 is a rotor, 28 and 29 are bearings, 30 is a shaft, 31 is a mandrel, 32 is a first mold, 33 is a second mold, 34 is an inlay formed in the bracket 24, and 35 is a center hole of the shaft 30.

As shown in FIG. 4, the conventional method for assembling a motor with an inlay is to set a first die 32 with an inlay 34 in a first die, attach a stator core 22 to a mandrel 31, and After the mold 32 and the second mold 33 are combined and the mandrel 31 is inserted into the stator core 22, the gap between the stator core 22 and the bracket 24 is filled and sealed with mold resin, and the stator 21 is manufactured. When the stator 21 is completed, the mandrel 31, the first mold 32, and the second mold 33 are released, and the motor is assembled by assembling the bearing 28, the rotor 27 including the shaft 30, the bearing 29, and the bracket 25.
After assembling the motor alone, as shown in FIG. 3B, the concentricity of the spigot 34 with respect to the shaft 30 of the motor is obtained by performing post-processing of the spigot 34 with reference to both center holes 35 of the shaft 30.

JP-A-8-308162

As described above, the accuracy of the inlay 34 of the conventional bracket 24 shown in FIG. 3 cannot secure the concentricity with respect to the shaft 30 due to the effects of component variations and assembly accuracy. The post-process of the inlay 34 is performed based on both the center holes 35.
However, if the shape of the spigot varies depending on the accessory parts, it is necessary to newly manufacture a bracket mold according to it, and even when using a mounting base, post-processing and a new mold are required as well, increasing the number of processing steps, There is also a problem that the cost of the mold increases.
Accordingly, an object of the present invention is to provide a highly accurate inlay and a molding method thereof without performing post-processing.

  In order to solve the above-mentioned problem, a first configuration of the present invention is a motor spigot provided to attach an accessory such as an encoder or a brake to a bracket of the motor, and the bracket has a plurality of holes. It is made of a metal such as aluminum, and the portion of the mold resin filled in the bracket that is exposed to the outside through the plurality of holes is an inlay.

  According to a second aspect of the present invention, there is provided a method of forming a motor inlay provided for attaching an accessory such as an encoder or a brake to a bracket of the motor, wherein the bracket is made of a metal such as aluminum having a plurality of holes. A first mold having a ring-shaped groove for forming an inlay is brought into close contact with the outside of the bracket, and the second mold for fixing the bracket and the stator core of the motor to a predetermined position is combined. Then, by filling the gap between the bracket and the stator core with mold resin, a portion of the filled mold resin exposed to the outside through the plurality of holes is filled into a groove formed in the first mold. And forming an inlay.

In the present invention, the resin flows into a hole provided in the bracket, and the spigot is molded into a free shape by the first mold at the time of stator molding. In this way, by forming the inlay with the first mold, the accessory can be mounted without post-processing of the inlay. Moreover, even if the shape of the spigot varies depending on the accessory, the same bracket can be used, and it can be handled only by changing the mold of the stator mold.
It should be noted that the strength of the spigot can be ensured by forming a plurality of holes formed by the bracket at equal intervals on the same circumference.

  According to the present invention, the spigot can be formed into a free shape at the time of sealing the mold resin, and post-processing is not required, thereby reducing the number of steps. In addition, it is not necessary to start a new bracket mold when the shape of the spigot is different, and the mold cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 shows an embodiment of the present invention, in which (a) is a sectional view of the entire motor. FIG. 2 is a cross-sectional view of the molding resin molding state in the present embodiment.
In the present embodiment, the motor with an inlay includes a stator 1, a stator core 2, a coil 3, an anti-load side bracket 4, a load side bracket 5, and a mold filled between the stator 1 and the bracket 4. The resin 6, the rotor 7, the bearings 8 and 9, and the shaft 10 are included. The anti-load side bracket 4 is formed of a metal (including an alloy) such as aluminum, and a plurality of through holes 15 are provided at equal intervals on the same circumference. The ring-shaped inlay 14 is formed integrally with the mold resin 6 through the hole 15.
The stator 1 is manufactured by mounting the coil 3 on the stator core 2 and sealing it with the mold resin 6 together with the bracket 4 and simultaneously molding the inlay 14. Further, the rotor 7 is held by bearings 8 and 9 and the bracket 5 is attached to constitute a motor.

A method for forming the spigot in the stator 1 will be described with reference to FIG.
First, the stator core 2 is inserted into the mandrel 11, the bracket 4 is attached and positioned, and then the mold resin 6 is pressed against the first mold 12 and the second mold 13 and sealed. A hole 15 is formed in the bracket 4, and a ring-shaped groove for forming a spigot is formed in the first mold 12, so that the mold resin is inserted into the first mold from the hole 15 provided in the bracket 4. 12 flows into the groove 12 and the inlay 14 is molded.

  INDUSTRIAL APPLICABILITY The present invention can be used in the field of a motor to which an accessory is attached as a highly accurate inlay and a molding method thereof without performing post-processing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and FIG. It is sectional drawing of the mold resin molding state in this Embodiment. A conventional example is shown, (a) is sectional drawing of a motor, (b) is a front view of a bracket. It is sectional drawing which shows the metal mold | die structure for mold resin formation in a prior art example.

Explanation of symbols

1 Stator 2 Stator Core 3 Coil 4 Bracket 5 Bracket 6 Mold Resin 7 Rotor 8 Bearing 9 Bearing 10 Shaft 11 Mandrel 12 First Mold 13 Second Mold 14 Inlay 15 Hole

Claims (2)

An inlay of a motor provided to attach an accessory such as an encoder or a brake to the motor bracket,
The bracket is made of a metal such as aluminum having a plurality of holes, and a mold resin filled in the bracket and sealing the stator core and the coil together with the bracket to the stator is ring-shaped outside through the plurality of holes. a projecting portion, Ri small portion spigot der than the diameter width of the plurality of holes in the radial direction,
Wherein the plurality of holes, spigot motor characterized that you have been formed at equal intervals on the same circumference with respect to the center of the bracket. A method for forming a motor spigot provided to attach an accessory such as an encoder or a brake to a motor bracket,
The bracket is made of a metal such as aluminum having a plurality of holes, and a ring-shaped groove for forming an inlay on the outside of the bracket, the groove having a radial width smaller than the diameter of the plurality of holes. The formed first mold is brought into close contact, and the bracket and the second mold for fixing the stator core of the motor to a predetermined position are combined, and the stator core and the coil together with the bracket are placed in the gap between the bracket and the stator core. By filling the stator with a mold resin to be sealed, a portion of the filled mold resin that protrudes in a ring shape through the plurality of holes is filled into a groove formed in the first mold, and an inlay is formed. Form the
Wherein the plurality of holes, motor spigot methods molding characterized that you have been formed at equal intervals on the same circumference with respect to the center of the bracket.

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