JPH07322553A - Motor - Google Patents

Abstract

PURPOSE:To obtain a motor in which a bracket for holding a bearing can be fixed to the resin molded part of the stator through simple work without requiring any adhesive while reducing the man-hour and the material cost. CONSTITUTION:A bracket 6 for holding a bearing 5 is fixed to one side of a resin molded part 10 where a winding 4 is applied to a stator core 3. The bracket 6 is provided with a hole 6a for passing a rotary shaft, a bearing holding part 6b, a plurality of notches, and a plurality of fixing holes 7a. The rotary shaft 2 of a rotor is born by bearings and the resin molded part is provided with a step corresponding to the bracket 6. A plurality of claw parts 9 corresponding to the fixing holes are formed integrally with an insulator 8 and projected from one side of the resin molded part and a protrusion 9a, corresponding to the fixing hole, is formed on the rear surface at the forward end of the claw part 9 thus securing the bracket 6 to the resin molded part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly to a bearing holding structure.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a bearing 5 is indispensable for supporting a rotary shaft 2 of a rotor 1 of an electric motor.
The bearing holding structure uses a bracket 21 to provide a cylindrical recess for holding the bearing in the center thereof, and presses the bracket into the resin mold portion 10 of the stator core 3 to form an adhesive material as shown in FIG. A method of fixing with 22 or a method of fixing with a screw 23 to a resin mold portion by providing a mounting hole as shown in FIG. 4 or a method of integrally molding with a stator core during resin molding is usually adopted. In this case, since at least one side of the bracket is press-fitted, it is necessary to fix it with an adhesive material, which causes a problem that man-hours and material cost are required. Further, the mounting work is difficult to automate and labor saving cannot be performed, which is a bottleneck in the process.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and relates to a bearing holding structure for an electric motor, in which a bearing is mounted on a resin mold portion of a stator by a simple operation without using an adhesive material. The purpose of the present invention is to provide an electric motor capable of maintaining the above-mentioned characteristics and reducing man-hours and material costs.

[0004]

In order to achieve the above object, a bearing in which a winding is wound around a stator iron core equipped with an insulator, and the rotor is axially supported on both sides of a resin-molded stator. In a motor having a bracket for holding, one of the brackets is embedded, and the other is fixed, one side of the resin mold portion is stepped corresponding to the fixed bracket, and A plurality of claws formed integrally with the insulator from one side are provided on the inner peripheral side so as to project, and a protrusion is formed on the lower surface of the tip of the claw,
A mounting hole is formed on the outer periphery of the bracket corresponding to the convex portion and a notch corresponding to the claw portion is formed substantially adjacent to one side of the mounting hole, and the bracket is fixed to a stator. And Further, the cutout portion is formed in a substantially rectangular shape, a substantially triangular shape, or a substantially semicircular shape. On the other hand, the mounting hole is formed in a substantially circular shape or a substantially rectangular shape. Furthermore, one side of the resin mold portion and the fixed side bracket are flush with each other.

[0005]

Since the electric motor is formed as described above, the winding is wound around the stator iron core having the insulator mounted, and the outer periphery of the stator core holds the bearings for supporting the rotor on both sides of the stator. In a motor provided with a bracket, one of the brackets embedded and the other fixed, the one side of the resin mold part is stepped corresponding to the bracket on the fixed side, and the one side of the resin mold part is A plurality of claws formed integrally with the insulator are provided on the inner peripheral side so as to project, and a convex portion is formed on the lower surface of the tip of the claw portion. Forming a notch corresponding to the claw portion substantially adjacent to one side of the hole,
The bracket is fixed to a stator, and the shape of the notch is formed into a substantially rectangular shape, a substantially triangular shape, or a substantially semicircular shape, while the mounting hole is substantially circular or substantially It was formed in a rectangular shape, and one side of the resin mold portion and the fixed side bracket were flush with each other. As a result, the bracket that holds the bearing is mounted after resin molding, the claw protruding from the insulator is inserted into the notch of the bracket, the bracket is pushed in the axial direction, and the mounting hole is rotated below the claw. The bracket can be fixed to the resin mold portion of the stator by moving and fitting the convex portion of the claw portion.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same parts as those in the conventional example have the same reference numerals. Hereinafter, the overall configuration of the electric motor will be described with reference to FIG. 2 and FIG. 1 which is a sectional view taken along the line AA ′.

After the insulator 8 is mounted on the teeth of the stator core 3 and the winding wire 4 is wound around the stator core 3, resin molding is performed to form the resin mold portion 10 of the stator. Further, the rotor 1 is fitted with the rotary shaft 2 to form a rotor. Next, a claw portion 9 formed integrally with the insulator 8 on at least one side of the resin mold portion is provided on the inner peripheral side so as to project. Further, a convex portion 9a is formed on the lower surface of the tip of the claw portion. On the other hand, a plurality of substantially circular mounting holes 7a corresponding to the convex portions and formed on the outer peripheral portion of the bracket 6, and a substantially rectangular notch corresponding to the claw portion and being substantially adjacent to one side of the mounting holes. Form part 7. Here, the rotary shaft is inserted into the through-hole 6a of the rotary shaft of the bracket, the bearing 5 for axially supporting the rotor is held by the bearing holding portion 6b of the bracket, and the rotor is incorporated into the stator. Is fixed to the resin mold part.

FIG. 3 is an exploded perspective view showing this structure. Hereinafter, referring to FIG. 3 together, the bracket and the claw portion on the insulator of the resin mold portion will be described. First, the structure of the bracket 6 will be described. The bracket is made of resin to hold the bearing in the center,
A cylindrical bearing holder 6b is provided. Further, a through hole 6a for the rotary shaft of the rotor is provided at the center thereof. Then
A plurality of substantially circular mounting holes 7a are provided on the outer periphery of the cylindrical bearing holding portion, and a substantially rectangular notch 7 is provided on one side of the mounting holes. The mounting hole may have a substantially rectangular shape, while the notch may have a substantially triangular shape or a substantially semicircular shape.

Next, the claw portion provided integrally with the insulator of the resin mold portion will be described. A plurality of claw portions 9 corresponding to the cutout portions of the bracket are provided on the insulator of the resin mold portion. Further, a convex portion 9a corresponding to the mounting hole is provided on the lower surface of the tip of the claw portion. Further, one side of the resin mold portion is provided with a step 10a corresponding to the bracket so that it is flush with the bracket after mounting. The bracket formed as described above, the bearing is held by the bracket using the resin mold portion, and the claw portion provided integrally with the insulator on one side of the resin mold portion of the stator is inserted into the notch portion of the bracket, and the other. And pushes the mounting hole along the axial direction, and rotationally moves the mounting hole to the lower part of the claw part to fit the convex part of the claw part and fix the bracket to the resin mold part of the stator.

[0010]

As described above, according to the present invention, since the electric motor is formed as described above, the winding is wound around the stator core having the insulator mounted, and the outer periphery of the stator core is resin-molded on both sides. A bracket that holds the bearing that supports the rotor is provided on the, and one of the brackets is embedded,
In the electric motor in which the other is fixed, one side of the resin mold portion is stepped corresponding to the fixed side bracket, and a plurality of claw portions integrally formed with the insulator are formed from one side of the resin mold portion. The protrusion is formed on the inner peripheral side, and a convex portion is formed on the lower surface of the tip of the claw portion. On the other hand, corresponding to the convex portion, the attachment hole is formed on the outer periphery of the bracket and is substantially adjacent to one side of the attachment hole To form a notch corresponding to the above, the bracket is fixed to the stator, and the notch is formed into a substantially rectangular shape, a substantially triangular shape, or a substantially semicircular shape, while Since the mounting hole is formed in a substantially circular shape or a substantially rectangular shape and the one side of the resin mold portion and the bracket on the fixed side are flush with each other after mounting, the adhesive material is completely eliminated as in the conventional case. Material cost is reduced by not using Easily it allows mounting the bracket to the resin mold portion of the stator after the resin mold of the stator. Furthermore, rotation of the bracket is prevented. As a result, the number of man-hours for manufacturing the electric motor and the material cost can be reduced.

[Brief description of drawings]

1 is a cross-sectional view of an embodiment of an electric motor according to the present invention, which corresponds to AA ′ in FIG.

FIG. 2 is a plan view of an embodiment of an electric motor according to the present invention.

FIG. 3 is an exploded perspective view of a bracket and a resin mold portion of the electric motor according to the present invention.

FIG. 4 is a sectional view of an example of a conventional electric motor.

FIG. 5 is a plan view of another example of a conventional electric motor.

[Explanation of symbols]

 1 Rotor 2 Rotating Shaft 3 Stator Iron Core 4 Winding 5 Bearing 6 Bracket 6a Rotating Shaft Through Hole 6b Bearing Holding Part 7 Notch 7a Mounting Hole 8 Insulator 9 Claw 9a Convex 10 Resin Mold 10a With Step

Front page continued (72) Inventor Koji Mori 1116 Suenaga, Takatsu-ku, Kawasaki City, Fujitsu General Ltd. (72) Inventor Yuji Soma 1116 Suenaga, Takatsu-ku, Kawasaki City, Fujitsu General Ltd.

Claims (7)

[Claims] 1. A stator iron core equipped with an insulator is wound with a winding wire, and a bracket for holding a bearing for axially supporting a rotor is provided on both sides of a stator having a resin-molded outer periphery, and one of the brackets is provided. In an electric motor which is embedded and the other is fixed, one side of the resin mold portion is stepped corresponding to the fixed side bracket, and a plurality of integrally formed insulators are formed from one side of the resin mold portion. The claw portion is projected on the inner peripheral side, and a convex portion is formed on the lower surface of the tip of the claw portion, while the mounting hole is formed on the outer periphery of the bracket corresponding to the convex portion and is almost adjacent to one side of the mounting hole. An electric motor, characterized in that a notch portion corresponding to the claw portion is formed and the bracket is fixed to a stator. 2. The electric motor according to claim 1, wherein the notch has a substantially rectangular shape. 3. The electric motor according to claim 1, wherein the notch has a substantially triangular shape. 4. The electric motor according to claim 1, wherein the notch has a substantially semicircular shape. 5. The electric motor according to claim 1, wherein the mounting hole is formed in a substantially circular shape. 6. The electric motor according to claim 1, wherein the mounting hole is formed in a substantially rectangular shape. 7. The electric motor according to claim 1, wherein one side of the resin mold portion and the bracket on the fixed side are flush with each other.