JPH09121510A - Fan-equipped motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool a motor by smoothly introducing outside air to the motor by opening the front-end opening of a breather drain which is communicated with the inside of the yoke of the motor at the position at which the opening can receive the wind pressure which is generated when a fan is rotated. SOLUTION: When an electric current is supplied to an armature 3a from external wiring through the terminal 11a of a connector 11, a brush 10, and a commutator 3c and a rotor 3 and fan 8 are rotated, outside air flows in a motor through a breather drain 12 due to a wind pressure generated by the rotation of the fan 8. The outside air is made to flow through the yoke 4 of the motor by the air flow which is generated by suction fins 8a provided on the central side of the fan 8, is sucked into the central part of the motor 8, and smoothly flows out of the motor from a vent hole 5c provided in a fan-side end bracket 5. Therefore, the motor 1 is efficiently cooled from the inside and various kinds of troubles which occurs when the motor 1 is overheated can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan-equipped motor which is provided with a cooling fan on a motor shaft and is used for improving cooling performance of, for example, a radiator of an automobile or a condenser of an air conditioner. The present invention relates to a cooling structure for preventing overheating of the motor itself.

[0002]

2. Description of the Related Art Conventionally, in a fan-equipped motor as described above, ventilation holes are provided in both end brackets attached to both ends of a motor yoke and rotatably supporting the motor shaft. Ventilation type motors have been put into practical use in which the outside air is introduced into the inside of the motor by utilizing the air flow generated by the internal fins (suction fins) provided in the central portion of the motor and the inside of the motor is cooled.

That is, FIG. 3 shows an example of such a fan-equipped motor. The fan-equipped motor 100 shown in the drawing has left and right end brackets attached to both ends of a cylindrical motor yoke 101. A motor shaft 104 is rotatably supported by 102 and 103, and a fan 105 is mounted on the right end side of the motor shaft 104 in the figure.

In addition, the end brackets 102 and 10
3 are provided with vent holes 102a and 103a, respectively.

When electric current is supplied through the connector 106 attached to the motor yoke 101 and the fan 105 rotates together with the motor shaft 104, the fan 1
The suction fin 105a provided at the center of 05
Vent hole 10 provided in the end bracket 103 on the non-fan side
An air flow that flows into the motor yoke 101 from 3a and exits to the outside of the motor from the ventilation hole 102a of the fan-side end bracket 102 is generated, thereby preventing the motor 100 from overheating.

[0006]

However, in the above-described conventional fan-equipped motor 100, water, particularly salt in a seaside area, is contained through the ventilation holes 102a and 103a provided in both brackets 102 and 103. It cannot be said that water does not enter the inside of the motor, and if water enters, it may cause rust inside the motor or impair the lubricity of the rotating parts, resulting in significant deterioration of motor performance. As shown in phantom lines, the waterproof cover 107 has to be attached to the ventilation hole 103a provided in the end bracket 103 on the air intake side, which is the side opposite to the fan side, and the number of parts and the number of attachment steps are increased, so that an increase in cost is avoided. There is a problem that there is no such problem, and the solution of such a problem has been a problem in such a ventilation type fan motor.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in a conventional motor with a fan, and can effectively prevent intrusion of water from the outside without increasing the number of parts. An object of the present invention is to provide a ventilation type fan-equipped motor capable of efficiently cooling the motor by smoothly introducing outside air into the motor.

[0008]

A fan-equipped motor according to a first aspect of the present invention is a fan-equipped motor having a fan attached to one end of a motor shaft, wherein a fan-side end bracket is provided with a vent hole. At the same time, the breather drain communicating with the inside of the motor yoke is configured so that the tip opening portion is opened at a position for receiving the wind pressure generated by the rotation of the fan, and an embodiment of the fan motor according to the present invention is provided. It is also necessary that the fan has a suction fin on the center side, the breather drain has a labyrinth structure, and the breather drain is formed integrally with a power supply connector. It is desirable that the structure of such a motor with a fan be a means for solving the above-mentioned conventional problems. To have.

[0009]

In the fan-equipped motor according to the first aspect of the present invention, since the tip end opening portion of the breather drain communicating with the inside of the motor yoke is opened at a position for receiving the wind pressure generated by the rotation of the fan, Due to the wind pressure formed by the fan, the air flowing into the motor yoke through the tip opening of the breather drain is discharged from the ventilation hole of the fan-side end bracket, so that the motor is effectively prevented from overheating. Further, since it is not necessary to provide a ventilation hole for intake air in the end bracket on the side opposite to the fan, the waterproof cover for the end bracket on the side opposite to the fan becomes unnecessary, and the number of parts and the number of mounting steps are reduced. Since the breather drain tip opening is formed at a position away from the motor yoke, water rarely directly enters through the opening, and water vapor contained in the air inside the motor yoke stops the motor. Even if condensation forms inside, it is easily discharged from the breather drain.

In the motor according to claim 2 as an embodiment of the motor with a fan according to the present invention, since the fan is provided with the suction fin on the center side, the air inside the motor is generated by the air flow formed by the suction fin. Will be distributed more smoothly. Also, in the fan-equipped motor according to the third aspect of the present invention, since the breather drain has the labyrinth structure, intrusion of water from the breather drain is more effectively prevented. Further, in the fan-equipped motor according to the fourth aspect of the present invention as well, since the breather drain is integrally formed with the power feeding connector, the number of parts is reduced, the number of assembling steps is reduced, and the cost is further advantageous. Will be things.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a fan-equipped motor according to an embodiment of the present invention. The fan-equipped motor 1 shown in the drawing has a cylindrical shape and is used for forming a field flux on the inner surface side. With the magnets 2 and 2, the armature 3a,
A rotor 3 including a motor shaft 3b and a commutator 3c
End brackets 5 and 6 are provided at both ends of a motor yoke 4 that accommodates the motor yoke 3 and the motor shaft 3b of the rotor 3 is provided with oilless metal 7 and 7 mounted on the central portions of the end brackets 5 and 6, respectively. Are rotatably supported by the end brackets 5 and 6.

At the right end of the motor shaft 3b in the figure,
A fan 8 having a suction fin 8a is attached to the center side.

An end bracket 5 (fan side end bracket) fitted in the opening on the right side of the motor yoke 4 in the figure.
Is a disk-shaped press-molded product in which step portions 5a and 5b are concentrically formed in the central portion and the outer peripheral portion, respectively, and the oilless metal 7 is attached to the step portion 5a in the central portion as described above. The motor shaft 3b of the rotor 3 is rotatably supported, and an appropriate number of ventilation holes 5c are formed along the circumference between the central step portion 5a and the outer peripheral step portion 5b. There is. Further, a substantially cylindrical water guard 9 having a stepped portion is attached to the outer peripheral side step portion 5b located outside the vent hole 5c, and it is assumed that water is splashed in the vicinity of the end bracket 5. Ventilation hole 5c
Water is prevented from entering through. In this embodiment, the opening of the water guard 13 is further covered with a protrusion 8b formed in the center of the fan 8 in an annular shape so that water is more difficult to enter.

The end bracket 6 (anti-fan side end bracket) fitted in the opening on the left side of the motor yoke 4 in the figure is a press-molded product similar to the fan side end bracket 5, and has a central portion. An oilless metal 7 is attached to the step portion 6a to rotatably support the motor shaft 3b.

On the lower side of the motor yoke 4, a power supply connector 11 integrally provided with a terminal 11a connected to the brush 10 by insert molding is attached, and an external connector (not shown) connected to the connector 11 is attached. The current supplied through the wiring is the brush 10 and the commutator 3c.
Through the armature 3a through the rotor 3
At the same time, the fan 8 rotates, and as a result, a wind that flows from the right to the left is generated as indicated by an arrow W in the figure, and this wind cools, for example, a radiator of an automobile or an air condenser of an air conditioner. There is.

A long breather drain 12 is integrally formed with the connector 11.

The opening 1 at the tip of the breather drain 12
2a is directed to the side of the fan 8, that is, to the windward side of the wind generated by the rotation of the fan 8, and the wind pressure generated by the fan 8 forces the outside air to flow into the motor yoke 4 and at the same time, to the motor together with the air. Condensation water, which is generated when the water vapor that has flowed in is condensed inside the motor, can be discharged to the outside.

Further, a fixing bracket 13 for mounting the fan-equipped motor 1 at a predetermined position is attached to the outer peripheral portion of the motor yoke 4.

A fan-equipped motor 1 having such a structure
, From the external wiring to the terminal 1 of the connector 11
When current is supplied to the armature 3a through the brush 1a, the brush 10 and the commutator 3c, and the rotor 3 and the fan 8 rotate, the air pressure generated by the fan 8 causes the outside air flowing into the motor through the breather drain 12 to flow into the fan 8. By the air flow drawn into the center of the fan 8 caused by the suction fins 8a provided on the center side of the
As shown by the small arrow in the figure, the air flows in the motor yoke 4 and smoothly flows out of the motor through the air holes 5c provided in the fan-side end bracket 5, so that the motor 1 is efficiently cooled from the inside. Therefore, various malfunctions of the motor due to overheating are prevented.

Even if water is splashed on the motor 1, since the tip end opening 12a of the breather drain 12 is separated from the motor body, water hardly enters directly from the breather drain 12 and the fan side The water guard 9 prevents water from entering through the air holes 5c of the end bracket 5. Further, even if the water vapor flowing into the motor together with the air is condensed while the motor 1 is stopped, it is discharged from the breather drain 12.

It is desirable to provide a labyrinth structure as illustrated in FIGS. 3 (a) and 3 (b) on the inner surface of the breather drain 12 as necessary, whereby water from the breather drain 12 can be provided. Intrusion can be almost completely prevented.

In the above embodiment, the breather drain 12 is formed integrally with the power supply connector 11, but the fan motor according to the present invention is not necessarily limited to such a structure. Instead, the connector 11 may be provided at a position different from the breather drain 12 depending on the arrangement of the fan motor.

[0024]

As described above, in the fan-equipped motor according to the first aspect of the present invention, the tip opening of the breather drain communicating with the inside of the motor yoke is positioned so as to receive the wind pressure generated by the rotation of the fan. Since it is opened, the air pressure can be forced to flow into the motor yoke by the fan to cool the inside of the motor, and the waterproof cover of the end bracket on the non-fan side is not required. An extremely excellent effect that the number of steps can be reduced is brought about.

Further, in the motor according to claim 2 as an embodiment of the fan motor according to the present invention, the air flowing into the motor yoke can be more smoothly circulated by the suction fin provided on the center side of the fan. Therefore, the cooling efficiency can be further improved, and in the fan-equipped motor according to the third aspect of the present invention, the breather drain is provided with the labyrinth structure, so that the entry of water from the breather drain can be prevented more effectively. In the motor with fan according to the fourth aspect of the present invention, the breather drain is integrated with the power feeding connector, so that the number of parts and the number of assembling steps can be further reduced, and the cost can be reduced. Can greatly contribute to

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a structure of a motor with a fan according to an embodiment of the present invention.

2A and 2B are cross-sectional views showing an example of a labyrinth structure provided in a blazer drain.

FIG. 3 is a vertical sectional view showing the structure of a conventional fan-equipped motor.

[Explanation of symbols]

 1 Motor with Fan 3b Motor Shaft 4 Motor Yoke 5 Fan End Bracket 5c Vent Hole 8 Fan 8a Suction Fin 11 Connector 12 Breather Drain

Claims (4)

[Claims] 1. A fan-equipped motor having a fan attached to one end of a motor shaft, wherein a fan-side end bracket is provided with a ventilation hole, and a tip end opening of a breather drain communicating with the inside of a motor yoke rotates the fan. A motor with a fan, which is opened at a position where it receives wind pressure generated by. 2. The motor with fan according to claim 1, wherein the fan has a suction fin on the center side. 3. The breather drain is provided with a labyrinth structure.
Motor with fan described. 4. The fan-equipped motor according to claim 1, wherein the breather drain is formed integrally with a power supply connector.