JPH05321893A - Radiator cooling fan - Google Patents

Abstract

PURPOSE:To cool efficiently the whole of a motor to drive a fan by arranging negative pressure parts in a fan boss so as to generate an air flow along the outer periphery of the motor in the opposite direction of an airflow caused by rotation of a fan. CONSTITUTION:When a fan 1 is rotated in the direction for sucking the outside air through a radiator 8 by means of an operation of a motor 5, the radiator 8 is cooled by this outside air. When the sucked outside air is flowed to the motor 5 side, on the rear side of the motor 5, an airflow is generated toward the shaft center of the motor 5. At this time, due to negative pressure parts 2c and 2d arranged in a fan boss 2 of the radiator cooling fan 1, an air flow is generated along the outer periphery of the motor 5 in the opposite direction of an airflow caused by rotation of the fan 1, so that the whole of the motor 5 can be cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator cooling fan used to cool an automobile radiator.

[0002]

2. Description of the Related Art Conventionally, as a radiator cooling fan, for example, there is one shown in FIG.

A radiator cooling fan 100 shown in the figure.
Is provided with a thin, substantially cylindrical fan boss 101 having a bottom portion 101a, and a bush 102 is integrally provided at the center of the bottom portion 101a of the fan boss 101.

The radiator cooling fan 100 is fixed to the motor shaft 104 by screwing a nut 108 into a tip screw portion 104a of a motor shaft 104 of a motor 103 having a metal bush 102 penetrating therethrough. This motor 103 has a cooling fan 100 positioned inside a shroud 106 installed in parallel with a radiator 105, and is mounted on a motor mounting stay 106 a provided on the shroud 106 via a bracket 107. Cools the radiator 105 by sucking the outside air through the radiator 105, and at the same time, the motor 1 is cooled by the outside air flowing to the shroud 106 side.
03 is also cooled.

[0005]

However, in the conventional radiator cooling fan 100 described above, when the outside air sucked through the radiator 105 flows to the shroud 106 side, it occurs behind the motor 103 (on the right side in the drawing). Although the rear end portion of the motor 103 can be cooled by the vortex flow, outside air cannot flow to the front end portion side of the motor 103, so that the motor 103 will be indispensable for further miniaturization in the future. There is a problem that the whole cannot be cooled sufficiently, and it has been a conventional problem to solve this problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art. Not only can the radiator be cooled sufficiently, but also the motor can be cooled efficiently, thereby reducing the size of the motor. It is an object of the present invention to provide a radiator cooling fan that can contribute to realization.

[0007]

According to the present invention, there is provided an axial flow type radiator cooling fan provided with a fan boss fixed to a motor shaft, the fan boss being attached to the fan boss of the fan. It is characterized in that a negative pressure portion for generating an air flow in a direction opposite to the wind direction generated by rotation is provided along the outer periphery of the motor, and the structure of this radiator cooling fan solves the above-mentioned conventional problems. As a means to

In one embodiment, the negative pressure portion is
The annular recess is concentric with the motor shaft and gradually increases from the radiator side toward the opening on the opposite side, and a plurality of inner blades provided in the annular recess.

[0009]

In the radiator cooling fan according to the present invention, when the motor is operated to rotate in the direction of sucking the outside air through the radiator, the outside air cools the radiator.

When the sucked outside air flows to the motor side, on the rear side of the motor (the side opposite to the radiator),
A flow is generated toward the axis of the motor.

At this time, the negative pressure portion provided on the fan boss of the radiator cooling fan generates an air flow in the direction opposite to the wind direction generated by the rotation of the fan along the outer circumference of the motor, so that the entire motor is cooled. The Rukoto.

Further, in the fan boss of the radiator cooling fan according to one embodiment, the inner blades constituting the negative pressure portion function as a centrifugal fan during the rotation of the fan, and the annular recess is formed from the radiator side to the opening on the opposite side. Since it is formed so as to be gradually larger toward the annular recess, negative pressure is applied to the annular recess, so that the air flowing into the annular recess is vigorously flown in the centrifugal direction along the inner surface of the annular recess.

Therefore, the flow toward the shaft center of the motor is attracted by the air flow toward the centrifugal direction at the fan boss and flows back to the fan boss side along the outer periphery of the motor, thereby cooling the entire motor. The Rukoto.

[0014]

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

1 to 3 show an embodiment (first embodiment) of a fan for cooling a radiator according to the present invention.

The radiator cooling fan 1 shown in the figure has a thin, substantially cylindrical fan boss 2 having a bottom portion 2a.
The fan blades 3 are provided on the outer circumference of the fan boss 2. The fan blades 3 are provided at two rotationally symmetric locations of the fan boss 2, and two fan blades 3 are provided, for a total of four blades.

A metal bush 4 having a D-shaped shaft hole 4a is integrally provided at the center of the bottom portion 2a of the fan boss 2.

The fan boss 2 has a metal bush 4
It has an annular recess 2c that is concentric with. In this embodiment, the annular recess 2c is configured to include the bottom 2a, and the opening 2g from the bottom 2a side to the opposite side thereof.
It is formed so that it gradually becomes larger toward.

Further, in the annular recess 2c, a plurality of (6 in this embodiment) inner blades 2d having inner edges that are substantially parallel to the outer peripheral wall of the annular recess 2c are radially provided at equal intervals. The inner blade 2d constitutes a negative pressure portion together with the annular recess 2c, and when the radiator cooling fan 1 rotates, it functions as a centrifugal fan.

In this radiator cooling fan 1, the D-shaped shaft hole 4a of the metal bush 4 is fitted into the D-shaped shaft hole 4a of the motor shaft 6 of the motor 5 from the annular recess 2c side. Tip screw portion 6 penetrating through and protruding from the bottom portion 2a
The nut 7 is screwed into a so as to be fixed to the motor shaft 6. The motor 5 has the cooling fan 1 positioned inside the shroud 9 installed in parallel with the radiator 8 and is mounted on the motor mounting stay 9 a provided on the shroud 9 via the bracket 10.

The radiator cooling fan 1 having the above structure
Then, when the motor 5 is actuated to rotate in a direction in which the outside air is sucked through the radiator 8, the radiator 8 is cooled by the sucked outside air.

When the sucked outside air flows to the rear end side of the motor 5 (right end side in FIG. 1) through the shroud 9, a flow toward the motor shaft 6, that is, a centripetal flow occurs behind the motor 5. ..

At this time, in the fan boss 2, the inner blade 2d functions as a centrifugal fan to create a negative pressure, and the annular recess 2c gradually increases from the radiator 8 side toward the opening 2g on the opposite side. Since it is formed, the air around the fan boss 2 flowing into the annular recess 2c is accelerated and flows in the centrifugal direction along the outer peripheral wall of the annular recess 2c.

Therefore, the outside air flowing toward the centripetal direction behind the motor 5 is sucked by the air flow toward the centrifugal direction in the fan boss 2, and the high speed is applied to the fan boss 2 side along the outer peripheral surface of the motor 5. Since it flows backwards with the motor 5,
Will be cooled as a whole.

FIGS. 4 and 5 show another embodiment (second embodiment) of the radiator cooling fan according to the present invention, in which the radiator cooling fan 21 according to this embodiment is the radiator cooling fan according to the previous embodiment. The difference from the fan 1 is that a plurality of sheets are provided at the bottom 22a of the fan boss 22 and inside the annular recess 22c (six in this embodiment as well).
A through hole 22e is provided between the inner blades 22d, and the other structure is the same as that of the previous embodiment.

In the radiator cooling fan 21 according to this embodiment, the fan boss 22 rotates to form an annular recess 22.
When the inner blade 22d of c functions as a centrifugal fan, the outside air is introduced into each of the through holes 22e in the annular recess 22c that is a negative pressure, so that the amount of air flowing to the motor 5 side of the fan boss 22 increases. However, it becomes possible to intensively cool the front end portion of the motor 5 in which the bearing that generates the most heat is built.

FIG. 6 and FIG. 7 show still another embodiment (third embodiment) of the radiator cooling fan according to the present invention.

The radiator cooling fan 31 according to this embodiment is provided with a plurality of (six in this embodiment) inner blades 32d in the annular recess 32c of the fan boss 32, and each wing end portion 32f of these inner blades 32d. The annular recess 32c
The other configurations are the same as those of the first embodiment.

In the radiator cooling fan 31 according to this embodiment, when the inner blade 32d rotates, each wing end 32f enhances the function as a centrifugal fan, so that the motor 5 can be cooled more efficiently. You can

FIGS. 8 and 9 show still another embodiment (fourth embodiment) of the radiator cooling fan according to the present invention, in which the fan boss 42 of the fan cooling fan 21 is the same as the radiator cooling fan 21 according to this embodiment. Through holes 42e are provided between a plurality of inner blades 42d (six in this embodiment) provided in the bottom portion 42a and in the annular recess 42c, and like the radiator cooling fan 31 according to the third embodiment. The wing ends 42f of the plurality of inner blades 42d are configured to protrude from the annular recess 42c, respectively, and the other configurations are the same as in the first embodiment.

Therefore, in the radiator cooling fan 41 according to this embodiment, when the inner blade 42d provided in the annular recess 42c of the fan boss 42 rotates,
As a result, the outside air is introduced from the through holes 42e into the annular recess 42c, which becomes negative pressure, and the amount of air flowing toward the motor 5 increases, and the inner blade 42d having the wing end 42f protruding from the annular recess 42c. Functions as an efficient centrifugal fan to increase the flow velocity of the outside air flowing backward from the rear end side of the motor 5, so that the entire motor 5 can be cooled very efficiently.

The detailed structure of the radiator cooling fan according to the present invention is not limited to the radiator cooling fans 1, 21, 31 and 41 according to the above-described first to fourth embodiments, and other structures are possible. As the configuration, for example, the fan blades 3, 32, 33 and 43 provided on the fan bosses 2, 22, 32 and 42 and the inner blade 2d,
The number of sheets 22d, 32d, and 42d can be appropriately changed.

[0033]

As described above, since the radiator cooling fan according to the present invention has the above-described structure, it is needless to say that the radiator can be sufficiently cooled and a large amount of air can be supplied to the motor at high speed. Since it is possible to flow along with, it is possible to efficiently cool the entire motor that drives the fan,
The extremely excellent effect that it can greatly contribute to the miniaturization of the motor is brought about.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view of a radiator cooling fan according to a first embodiment of the present invention mounted on a fan motor.

FIG. 2 is a rear view of the radiator cooling fan of FIG.

FIG. 3 is a partial cross-sectional explanatory view taken along the line AA of FIG. 2;

FIG. 4 is a rear view showing the second embodiment of the radiator cooling fan according to the present invention.

FIG. 5 is a partial cross-sectional explanatory view taken along the line BB of FIG. 4;

FIG. 6 is a rear explanatory view showing a third embodiment of the radiator cooling fan according to the present invention.

FIG. 7 is a partial cross-sectional explanatory view taken along the line C-C in FIG. 6;

FIG. 8 is a rear explanatory view showing a fourth embodiment of the radiator cooling fan according to the present invention.

FIG. 9 is a partial cross-sectional explanatory view taken along the line D-D in FIG. 8;

FIG. 10 is a cross-sectional explanatory view showing a state in which a conventional radiator cooling fan is attached to a fan motor.

[Explanation of symbols]

1 21 31 41 Radiator cooling fan 2 22 32 42 Fan boss 2c 22c 32c 42c Annular recess (negative pressure portion) 2d 22d 32d 42d Inner blade (negative pressure portion) 2g 22g 32g 42g Open 5 Motor 6 Motor shaft 8 Radiator

Claims (2)

[Claims] 1. A fan for cooling an axial flow type radiator, comprising a fan boss fixed to a motor shaft and arranged close to a radiator, wherein the fan boss has a direction opposite to a wind direction generated by the rotation of the fan. A fan for cooling a radiator, which is provided with a negative pressure portion for generating the air flow of the air along the outer circumference of the motor. 2. The negative pressure portion is composed of an annular recess that is concentric with the motor shaft and gradually increases from the radiator side toward the opening on the opposite side, and a plurality of inner blades provided in the annular recess. The radiator cooling fan according to claim 1.