JP3823600B2 - motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor, and more particularly to a technique for increasing the cooling (heat radiation) efficiency of a motor.
[0002]
[Prior art]
As shown in FIG. 6, the conventional motor A is wound around a rotor 1 that is rotatably supported by a bearing 16, a magnet 9 of a stator 8 that gives a field to the rotor 1, a cooling fan 10, and an iron core 2. A commutator 12 that is electrically connected to the coil 11; two power supply brushes 13 that are in sliding contact with the commutator 12; two brush holders 7 that hold the power supply brushes 13 by crimping; and two brush holders 7 that are insulated. Insulating plate 14 for carrying out, and bearing stand 15 etc. couple | bonded with the insulating plate 14 are comprised. In addition, 17 in FIG. 6 is a rotor shaft.
[0003]
Conventionally, when the insulating plate 14 and the bearing base 15 are coupled, for example, as shown in FIG. 7, a method of crimping the insulating plate 14, which is a thermoplastic molded product, to the bearing base 15, or the insulating plate 14 and A method of joining the bearing base 15 by simultaneous molding is often used.
[0004]
[Problems to be solved by the invention]
However, in the small high-power motor A, the time during which the work can be continuously performed varies depending on the cooling efficiency of the motor A. Conventionally, an intake hole 32 is provided in a portion other than the portion where the bearing base 15 of the motor A and the insulating plate 14 are joined, and air is sucked from the intake hole 32 by the cooling fan 10 to cool the coil and other components. However, the intake hole 32 cannot be enlarged in order to secure a coupling portion between the bearing base 15 and the insulating plate 14, so that a sufficient cooling effect cannot be obtained conventionally, and the continuous operation is performed due to the temperature rise of the motor A. There was a problem that time was shortened.
[0005]
The present invention was invented in view of the above-described problems of the conventional example, and the object of the present invention is to improve the cooling (heat dissipation) efficiency and to provide a motor that can cope with continuous work for a long time. In offer.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a motor having a power supply brush 13 for energizing the commutator 12 of the rotor 1, and an insulating plate for insulatingly holding the power supply brushes 13 having different polarities. 14, a bearing base 15 for holding the insulating plate 14, and a communication cylinder 4 having good thermal conductivity and an inner hollow portion functioning as an intake hole, and the bearing base 15 and the communication cylinder 4 Is integrally formed of a metal material, and the communicating tube 4 is inserted into the hole 30 provided in the insulating plate 14 and the tip 4b of the communicating tube 4 is crimped, whereby the insulating plate 14 and the insulating plate 14 are connected to each other. Since the bearing base 15 is integrally coupled, the inside of the communication tube 4 becomes an air intake hole through which air passes. Further, since the communication tube 4 is made of a material having good thermal conductivity, heat is transmitted through the communication tube 4 itself. Can escape to the outside, Thus, the cooling (heat radiation) efficiency of the motor A is greatly increased by the expansion of the intake holes and the heat radiation area of the insulating plate 14 and the bearing base 15, and the small high-power motor is continuously operated for a long time. Even in this case, the temperature rise of the motor A can be reduced, and continuous work for a long time becomes possible. Further, since the communication cylinder 4 and the bearing base 15 are integrally formed of a metal material, the cooling effect can be enhanced while reducing the number of parts and simplifying the structure and improving the assemblability.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0008]
1 and 2 show the basic concept of the present invention. As shown in FIG. 1, the motor A of this reference example is attached to a rotor 1 rotatably supported by a bearing 16, a magnet 9 of a stator 8 that gives a field to the rotor 1, and an iron core 2 of the rotor 1. A cooling fan 10, a commutator 12 electrically connected to a coil 11 wound around the iron core 2, two power supply brushes 13 that are in sliding contact with the commutator 12, and two brush holders 7 that hold the power supply brush 13 by caulking And an insulating plate 14 for insulatingly supporting the two brush holders 7, a bearing base 15 coupled to the insulating plate 14, and the like. The motor A is basically the same as the conventional example except for a method of coupling the insulating plate 14 and the bearing base 15.
[0009]
In the example of FIG. 2, the insulating plate 14 for insulating and holding the power supply brushes 13 having different polarities and the bearing base 15 for holding the insulating plate 14 form the communication tube 4 having good heat conduction. For example, it is connected at three places. Here, the communication cylinder 4 is formed of a hollow cylindrical eyelet, and the communication cylinder 4 is inserted into the holes 30 and 31 provided in the connecting portion of the insulating plate 14 and the bearing base 15 so that both end portions 4a of the communication cylinder 4 are respectively connected. By caulking, the insulating plate 14 and the bearing base 15 are integrally coupled via the communication cylinder 4. In this example, the communication cylinder 4 is made of a metal material such as aluminum having good thermal conductivity. The communication cylinder 4 functions as an air intake hole in the inner hollow portion, and the communication cylinder 4 itself functions as a heat bridge. To do. In addition to the portion where the insulating plate 14 and the bearing stand 15 are joined, a suction hole 32 similar to the conventional one is provided. The insulating plate 14 is made of, for example, a thermoplastic molded product, and the bearing base 15 is made of metal, but it is of course not limited to these materials.
[0010]
Thus, by connecting the insulating plate 14 and the bearing base 15 via the hollow communication cylinder 4, an intake hole can be added to the coupling portion between the insulating plate 14 and the bearing base 15, and the communication cylinder 4. Is made of a material having good thermal conductivity such as aluminum, so that heat can be transferred to the outside through the communication tube 4 itself. Accordingly, since the cooling (heat radiation) efficiency of the motor A is greatly increased by the expansion of the intake holes and the heat radiation area of the insulating plate 14 and the bearing base 15, the motor can be operated even for a long continuous operation of the small high-power motor. The temperature rise of A can be reduced, and continuous work for a long time is possible.
[0011]
In this example, the cooling fan 10 is attached to a protrusion 33 cut and raised from the iron core 2 of the rotor 1. The iron core 2 is configured by laminating a large number of iron pieces 3 in the axial direction of the rotor shaft 17, and a part of one iron piece 3 on the fan mounting side B is cut and raised to form a protrusion 33. The cooling fan 10 includes a mounting portion 19 formed in a ring shape and a plurality of blade portions 20 provided integrally with the mounting portion 19, and a protrusion 33 bent from the iron piece 3 to the mounting portion 19. The cooling fan 10 is mechanically fixed to the iron core 2 by locking the.
[0012]
FIG. 3 shows an embodiment of the present invention, and shows a case where the communication tube 4 and the bearing stand 15 are integrally formed of the same material. Other configurations are the same as those in FIGS. 1 and 2, and only different points will be described. In this example, the bearing base 15 and the hollow communication cylinder 4 are integrally formed of a metal material such as aluminum, for example, and the communication cylinder 4 is inserted into the holes 30 and 31 provided in the insulating plate 14 to communicate with each other. The bearing base 15 and the insulating plate 14 are coupled via the communication cylinder 4 by crimping the tip 4 b of the cylinder 4. Accordingly, the same operational effects as those of FIGS. 1 and 2 can be obtained, and the communication cylinder 4 is integrally formed of the same metal material as that of the bearing base 15, thereby reducing the number of parts and simplifying the structure and improving the assemblability. The cooling effect can be enhanced while aiming.
[0013]
FIG. 4 shows a case where the radiating fin 5 is provided at the end 4 c of the communication tube 4. Other configurations are the same as those in FIGS. 1 and 2, and only different points will be described. In this example, the radiating fins 5 are projected in a cross shape outwardly from the outer end 4 c of the communication cylinder 4, and these radiating fins 5 are arranged outside the motor A. As a result, the cooling effect by the communication tube 4 and the heat dissipation effect by the radiation fin 5 can be combined to further enhance the cooling effect, and the number of parts is increased because the radiation fin 5 is provided integrally with the communication tube 4. Can be prevented.
[0014]
FIG. 5 shows a case where the radiation fins 6 are provided on the inner surface 4 d of the communication cylinder 4. Other configurations are the same as those in FIGS. 1 and 2, and only different points will be described. In this example, the heat radiating fins 6 are provided so as to project toward the inner surface 4 d of the communication tube 4. Each radiating fin 6 extends in a cross shape along the axial direction of the communication tube 4. Thereby, the cooling effect by the communication tube 4 and the heat dissipation effect by the heat radiation fin 6 can be combined to further enhance the cooling effect, and the heat radiation fin 6 protrudes from the inner surface 4d of the communication tube 4. There is also an advantage that the coupling strength between the insulating plate 14 and the bearing base 15 can be increased.
[0015]
The motor A of the present invention is optimally used for small high-power motors such as electric tools.
[0016]
【The invention's effect】
As described above, the invention according to claim 1 is a motor having a power supply brush for energizing the commutator of the rotor, and is an insulating plate for insulating and holding the power supply brushes having different polarities. And a bearing base for holding the insulating plate, and a communication cylinder having good thermal conductivity and an inner hollow portion functioning as an intake hole, and the bearing base and the communication cylinder are integrally made of a metal material. The connecting plate is formed by inserting the connecting tube into the hole provided in the insulating plate and caulking the tip of the connecting tube, so that the insulating plate and the bearing stand are integrally connected via the connecting tube. The inside of the cylinder becomes an air intake hole through which air passes, and the communication cylinder is made of a material having good thermal conductivity, so that heat can be released to the outside through the communication cylinder itself, and therefore, the insulating plate and the bearing For expansion of the air intake hole with the base and expansion of the heat dissipation area Therefore, the cooling (heat dissipation) efficiency of the motor is greatly improved, and even when a small high-power motor is operated continuously for a long time, the temperature rise of the motor can be reduced, and a long continuous operation is possible. Become. In addition, since the communicating cylinder and the bearing stand are integrally formed of the same material, the cooling effect can be enhanced while reducing the number of parts and simplifying the structure and improving the assemblability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the basic concept of the present invention.
2A is a right side view of FIG. 1, and FIG. 2B is a sectional view taken along line BB of FIG.
3A is a side view of an embodiment of the present invention, and FIG. 3B is a cross-sectional view taken along the line CC of FIG. 3A.
4A is a side view of still another embodiment, and FIG. 4B is a cross-sectional view taken along the line DD of FIG. 4A.
5A is a side view of still another embodiment, and FIG. 5B is a cross-sectional view taken along line EE of FIG. 5A.
FIG. 6 is a cross-sectional view of a conventional example.
7A is a right side view of FIG. 6, and FIG. 7B is a sectional view taken along the line DD of FIG.
[Explanation of symbols]
A motor 1 rotor 4 communication cylinder 4c end 4d inner surface 5,6 heat radiation fin 12 commutator 13 power supply brush 14 insulating plate 15 bearing stand

Claims (1)

A motor having a power supply brush for energizing the rotor commutator, an insulating plate for holding the power supply brushes together with different polarities and insulation separating the pedestal for holding the insulating plate, heat conduction The inner hollow portion includes a communication cylinder that functions as an intake hole, and the bearing base and the communication cylinder are integrally formed of a metal material, and the communication cylinder is formed in a hole provided in the insulating plate. A motor characterized in that an insulating plate and a bearing base are integrally coupled through a communicating cylinder by inserting and crimping a tip of the communicating cylinder .

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