JPH07298553A - Motor fan - Google Patents

Abstract

PURPOSE:To provide a high output motor fan having high reliability of waterproof, dustproof, heat resistance and the like at a low price. CONSTITUTION:A motor 1 is provided with an open rear brush holder 11 and a self cooling fan 13 at the end part. The vicinity of the motor mounting part of a shroud 3 is formed into a nearly cup-form resin case 16, and the shroud 3 is provided with a discharge port 14 for discharging air flow and an inlet for suction, and the open part of the motor is covered with the shroud by mounting the motor in the combined surface of the shroud through a seal material 17. With the rotation of the self-cooling fan 13, air of which the temperature goes up within the motor is discharged from the discharge port 14, so that the inner part of the motor is evacuated and external air is sucked from the inlet for suction and machinery parts inside the motor is cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile radiator and an electric fan for cooling a condenser.

[0002]

2. Description of the Related Art In recent years, electric fans for automobiles have been required to have a higher output in order to obtain a larger airflow performance, and at the same time, have a high temperature due to overcrowding in the engine room and high output of the engine. Higher reliability performance is required.

A conventional electric fan will be described below. 3 and 4 show the configuration of a conventional electric fan. In FIG. 3, 3 is a shroud, 1 is a motor, 23 is a motor mounting leg, and 2 is a fan.

As shown in FIG. 3, this type of electric fan has a waterproof structure with waterproof seals 26, 27, and 28 for the motor alone, and the fan is used for the purpose of preventing the infiltration of water by the breathing action that occurs when the motor is operated or stopped. A general structure is to provide a breathing hole 24 in the side motor bracket and prevent water from entering by breathing a waterproof cap 25 into the breathing hole, or to provide a drain 29 on the side opposite to the fan as shown in FIG.

In addition, as described in the embodiment of Japanese Utility Model Laid-Open No. 3-113959, a ventilation hole is provided in the fan-side motor bracket, and another ventilation hole communicating with the ventilation hole through the air gap in the motor bracket is provided. There is known a structure in which a negative pressure is generated by the rotation of a fan and the resulting air flow improves cooling efficiency.

[0006]

However, the above-described conventional structure has various problems. First, in the structure of FIG. 4, it is necessary to seal many points such as the lead wire connection part and the brush holder mating surface in order to maintain the waterproof structure of the motor alone, and the sealing material is made of ultraviolet rays to prevent deterioration at high temperature. An expensive sealing material such as a hardening type was required.

To further increase the output, the allowable temperature of the armature and the bearing and the deterioration of the seal portion are obstacles to the increase of the output. Was there.

Further, although the cooling effect can be obtained even in the structure described in the embodiment of Japanese Utility Model Laid-Open No. 3-113959,
There is a problem that dust and the like enter the motor due to the generated air flow.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a highly reliable and high-output electric fan at a lower cost than the conventional one.

[0010]

An electric fan according to the present invention is an electric fan including a motor, a fan, a fan guide, and a shroud having a motor mounting portion, and the motor has an open motor rear portion on the side opposite to the fan. A self-cooling fan is provided at the end of the output shaft, and the shroud has a substantially cup shape with the motor housing mounting portion having the fan side as an open end to cover the rear portion of the motor and the vicinity of the self-cooling fan arranged in the cup-shaped portion. Equipped with at least one outlet in the circumferential tangential direction,
In addition, at least one suction port is provided on the rotation direction side of the self-cooling fan, and a motor is attached to this shroud.

Further, a motor positioning means is provided on the motor mating surface of the shroud.

[0012]

According to the present invention, the self-cooling fan is rotated by the operation of the motor, and the temperature-elevated air in the motor is forcibly discharged to the outside through the discharge port. On the other hand, the discharge causes negative pressure inside the motor, and air having a relatively low temperature is sucked into the motor through the suction port. On the basis of this air flow, an air flow for cooling the inside of the motor is generated to cool the motor internal engine parts. That is, since the brush holder has an open structure, the brush, the self-cooling fan side bearing, and the armature are cooled, so that the temperature rise is suppressed and high output can be achieved.

Further, the shroud mating surface is sealed,
Since the shroud is covered with a cover that is a cup-shaped portion, the rear part of the motor does not need to be sealed. Especially, the vicinity of the brush terminal, which was required in the past, does not require a super-heat-resistant seal material, and the water resistance deteriorates. Higher output can be achieved.

Further, since the motor positioning means is provided on the motor mating surface of the shroud, the shroud can be mounted concentrically without interference between the inner diameter of the air guide and the outer diameter of the fan.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a half sectional view of an electric fan according to one embodiment of the present invention, FIG. 2 is a half sectional view of an electric fan according to another embodiment of the present invention, and FIG. 3 is a substantially cup shape of the electric fan according to the present invention. It is a sectional view of a part.

In FIG. 1, the motor 1 comprises bearings 9 and 1
A bracket A4 having an armature 8 having 0, a magnet 5 facing the front, and a magnet 7 facing the opposite side.
And a brush holder 11 having an open structure in which a brush 12 is incorporated, and a self-cooling fan 13 is attached to an end portion of the bracket B6. The shroud 3 has a substantially cup-shaped resin case 1 near the center of the motor mounting portion.
6 is formed, and when the motor 1 is assembled, the discharge port 14 is provided in a substantially circumferential tangential direction of the self-cooling fan 13, and further to the rotation direction side of the self-cooling fan 13 with respect to the discharge port 14. A suction port 15 is provided.

The outlet 14 and the inlet 15 described above are
The shroud 3 is formed integrally with the substantially cup-shaped resin case 16 and is arranged in a downward direction with respect to the mounting posture of the main body.

In one embodiment of the present invention, the shroud 3 is made of resin, and the above-mentioned substantially cup-shaped resin case 16, the discharge port 14 and the suction port 15 are integrally formed. It helps to reduce points. However, the cooling effect of the present invention can be obtained and a high output can be achieved even if the shroud is not integrally formed and the substantially cup-shaped resin case 16, the discharge port 14, and the suction port 15 are independent.

A motor positioning guide 21 is provided on the mating surface with the motor, and is fixed to the shroud 3 with a mounting member 18, a screw 19 and a nut 20 via a sealing material 17, and a fan 2 is provided in front of the motor 1. Is attached.

Next, the operation of this embodiment will be described. The self-cooling fan 13 is rotated by the operation of the motor 1, and the air whose temperature has risen inside the motor is forcibly discharged to the outside through the discharge port 14. On the other hand, the discharge causes the inside of the motor to have a negative pressure, and the air having a relatively lower temperature than the outside of the motor is sucked into the inlet 1.
Inhaled through 5. An air flow for cooling the inside of the motor is generated based on this air flow, and the motor internal engine parts are cooled. That is, since the brush holder 11 has an open structure, the brush 12, the self-cooling fan side bearing 10, and even the armature 8 are cooled, and high output can be achieved.

In addition, since the shroud is covered with the substantially cup-shaped resin case 16, the seal material around the brush holder including the super heat-resistant seal agent in the vicinity of the brush terminal, which is conventionally required, becomes unnecessary, and the heat resistance is extremely deteriorated. The water resistance is small and the water resistance can be improved.

Further, since the drainage port 14 and the suction port 15 are arranged downward, the intrusion of water into the motor is extremely small, and the labyrinth shape such as the internal shape of the drainage port 14 and the suction port 15 or the vicinity thereof. It is possible to further improve the reliability by setting the above. By devising the shape of the lower portion of the substantially cup-shaped resin case 16, that is, by devising a taper or the like, it is possible to drain the flooded water from the drain port 14 even in the worst case.

Further, the motor positioning guide 21 provided on the mating surface of the shroud 3 enables the motor to be mounted concentrically with respect to the center of the shroud 3, and the fan 2 and the air guide portion of the shroud can function without interfering with each other. If the motor is provided with a shroud mounting hole or tap, the positioning of the motor is unnecessary because it is restricted by the hole or tap. The effect is extremely large. This is especially effective when a spring clamp is used to fix the motor and shroud.

In the present invention, the effect of the self-cooling fan is extremely large, but the cooling effect can be expected to some extent if the motor is a partially open type and the exhaust port and the intake port are provided. Of course, the effect is smaller than the case where the self-cooling fan is provided, but it has been confirmed by experiments that the cooling effect is more effective than the case where a single hole such as a breathing hole is provided.

Further, according to the present invention, since the airflow for cooling the motor engine parts can be cooled without directly passing through the air gap inside the motor, the ratio of dust entering the armature is extremely small,
Dust will not accumulate on the armature and cause motor lock or other abnormalities.

[0027]

As is apparent from the above embodiments, according to the present invention, an airflow is generated by the opening structure of the brush holder, the self-cooling fan built-in, and the discharge port and the suction port provided in the shroud cover. Thus, it is possible to provide an electric fan of high power capable of efficiently cooling internal engine parts of a motor and having high water resistance, dust resistance and heat resistance at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partial sectional view of a conventional electric fan.

FIG. 4 is a diagram showing the structure of another conventional electric fan.

[Explanation of symbols]

 1 Motor 2 Fan 3 Shroud 4 Bracket A 5,7 Magnet 6 Bracket B 8 Armature 9,10 Bearing 11 Brush holder 12 Brush 13 Self-cooling fan 14 Discharge port 15 Suction port 16 Resin case 17 Sealing material 18 Mounting bracket 19 Screw 20 Nut 21 Positioning guide 23 Motor mounting leg 24 Breathing hole 25 Waterproof cap 26, 27, 28 Waterproof seal 29 Drain

Claims (4)

[Claims] 1. An electric fan comprising a motor, a fan, a fan guide, and a shroud having a motor mounting portion, wherein the motor has a motor rear portion on the side opposite to the fan which is an open type and self-cools at an output shaft end portion. The shroud has a fan, and the motor housing mounting portion has a substantially cup shape with the fan side being an opening shape to cover the rear portion of the motor portion, and at least in the circumferential tangential direction in the vicinity of the self-cooling fan arranged in the cup-shaped portion. An electric fan having one discharge port, at least one suction port provided on the rotation side of the self-cooling fan, and a motor attached to the shroud. 2. The electric fan according to claim 1, wherein the discharge port and the suction port are substantially tubular and are formed integrally with the shroud. 3. The electric fan according to claim 1, wherein the discharge port and the suction port are arranged in a downward direction with respect to the mounting posture of the main body. 4. The electric fan according to claim 1, wherein a motor positioning means is provided on the motor mating surface of the shroud.