JPH0592498U - Radiator cooling fan - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a radiator cooling fan capable of efficiently cooling a fan motor. [Structure] A plurality of inner blades 2d are radially provided in an annular recess 2a of a fan boss 2. The outer peripheral wall 2c of the annular recess 2a of the fan boss 2 is provided with a vent hole 2e located between the inner blades 2d.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radiator cooling fan used for cooling a radiator of an automobile.

[0002]

[Prior Art]

 Conventionally, the radiator cooling fan described above is, for example, one shown in FIG.

The radiator cooling fan 100 shown in the figure is provided with a fan boss 101. The fan boss 101 is provided with an annular recess 101a that is concentric with the center of rotation and a metal bush 102 in the center. It is provided integrally.

The radiator cooling fan 100 is fixed to the motor shaft 104 by screwing a nut 108 into a threaded portion 104a of a motor shaft 104 of a fan motor 103, in which a metal bush 102 penetrates from the annular recess 101a side. There is. This motor 103 has a cooling fan 100 located inside a shroud 106 installed in parallel with a radiator 105, and is mounted on a motor mounting station 106a provided on the shroud 106 via a bracket 107. The cooling fan 100 cools the radiator 105 by sucking the outside air through the radiator 105, and also cools the motor 103 by the outside air flowing to the shroud 106 side.

[0005]

[Problems to be solved by the device]

 However, in the above-described conventional radiator cooling fan 100, when the outside air sucked through the radiator 105 flows to the shroud 106 side, a swirl flow generated behind the motor 103 (on the right side in the drawing) causes the motor 103 to rotate. Although it is possible to cool the rear end part, the front end part of the motor 103 can hardly be exposed to the outside air, so cooling of the entire motor, which is indispensable for promoting downsizing of the motor 103, is essential. There is a problem that it is difficult, and solving it has been a conventional issue.

[0006]

[The purpose of the device]

 This invention was made with a focus on the above-mentioned conventional problems, and it goes without saying that the radiator can be cooled sufficiently, and it also enables cooling of the entire motor, contributing to the downsizing of the motor. The aim is to provide a radiator cooling fan that can do this.

[0007]

[Means for Solving the Problems]

 This invention is provided with a fan boss that has an annular recess that is concentric with the center of rotation and that is fixed to the motor shaft with the opening of the annular recess facing the fan motor, and is arranged between the radiator and the fan motor. In the axial-flow radiator cooling fan, a plurality of inner blades are radially provided in the annular recess of the fan boss, and the inner blades of the plurality of inner blades are provided on the outer peripheral wall of the annular recess of the fan boss. The structure is characterized in that a ventilation hole is provided between the fan boss and the outside to communicate with the outside of the fan boss, and the structure of this radiator cooling fan is a means for solving the above-mentioned conventional problems.

[0008]

[Function of the device]

 In the radiator cooling fan according to the present invention, when the fan motor is actuated 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 toward the motor, a flow toward the shaft center of the motor occurs behind the motor.

At this time, at the fan boss of the radiator cooling fan, the rotation of the fan boss causes the inner blade to function as a centrifugal fan, resulting in negative pressure, and the negative pressure causes air flowing into the annular recess to pass through the annular recess. It will flow smoothly and vigorously from the pores toward the centrifugal direction.

Therefore, the airflow toward the shaft center of the motor is attracted by the high-speed airflow toward the centrifugal direction in the fan boss and flows back to the fan boss side along the outer peripheral surface of the motor, whereby the motor The whole will be cooled.

[0012]

【Example】

 The invention will be described below with reference to the drawings.

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

The radiator cooling fan 1 shown in the figure has a thin, substantially cylindrical fan boss 2 having an annular recess 2 a that is concentric with the center of rotation, and a fan blade 3 provided on the outer periphery of the fan boss 2. The fan blades 3 are provided at two places, which are opposite to each other in rotation of the fan boss 2, and two fan blades 3 are provided, respectively, for a total of four.

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

Further, in the annular recess 2a of the fan boss 2, a plurality of (10 in this embodiment) inner blades 2d having inner edges that are substantially parallel to the outer peripheral wall 2c of the annular recess 2a are radially and It is provided so as to be symmetrical with respect to FIG. 2, and when the radiator cooling fan 1 rotates, it functions as a centrifugal fan.

Further, the outer peripheral wall 2 c of the annular recess 2 a of the fan boss 2 is provided with a ventilation hole 2 e that connects the annular recess 2 a and the outside of the fan boss 2. The ventilation holes 2e are provided at a total of 6 places between the inner blades 2d (excluding the portion where the four fan blades 3 are provided), and the inner blades 2d function as centrifugal fans. At this time, the air flowing into the annular recess 2a, which becomes a negative pressure, can be smoothly discharged from these vent holes 2e in the centrifugal direction.

In this radiator cooling fan 1, a portion of the fan motor 5 having a D-shaped cross section is fitted into the D-shaped shaft hole 4a of the metal bush 4 and penetrates the D-shaped shaft hole 4a. The nut 7 is screwed into the threaded portion 6a of the motor shaft 6 so that the opening 2f of the annular recess 2a is fixed to the motor shaft 6 with the fan motor 5 side facing. The fan motor 5 is mounted via a bracket 10 on a motor mounting stay 9a provided on the shroud 9 with the cooling fan 1 positioned inside the shroud 9 installed in parallel with the radiator 8.

In the radiator cooling fan 1 having the above-described configuration, when the fan motor 5 is operated to rotate in a direction to suck the outside air through the radiator 8, the radiator 8 is cooled by the sucked outside air.

When the outside air that has passed through the radiator 8 flows through the shroud 9 toward the rear end side of the fan motor 5 (the right end side in FIG. 1), behind the fan motor 5, it flows toward the motor shaft 6, that is, A centripetal flow occurs.

At this time, in the fan boss 2, since the inner blade 2d functions as a centrifugal fan due to the rotation thereof, a negative pressure is generated in the annular recess 2a, and the annular recess 2a is provided with the vent hole 2e. The air in the vicinity of the fan boss 2 flowing into the annular recess 2a is accelerated and smoothly flows out from each vent hole 2e toward the centrifugal direction.

Therefore, the air flow in the centripetal direction behind the fan motor 5 is attracted by the high-speed air flow in the fan boss 2 in the centrifugal direction, and the fan boss 2 moves along the outer peripheral surface of the fan motor 5. Since it flows backward to the side, the entire motor 5 is cooled.

The detailed structure of the radiator cooling fan according to the present invention is not limited to the above-described embodiment, and other structures such as the number of the fan blades 3 and the inner blades 2d are not limited to the above. Each can be changed appropriately.

[0024]

[Effect of the device]

 As described above, since the radiator cooling fan according to the present invention has the above-described configuration, not only can the radiator be cooled, but the air near the fan boss can be smoothly discharged in the centrifugal direction. Since air can flow from the rear end side of the fan motor to the fan boss side along the outer peripheral surface, the entire fan motor can be efficiently cooled, which greatly contributes to the downsizing of the motor. It is possible to obtain an extremely excellent effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a radiator cooling fan according to an 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 cross-sectional explanatory view showing a state in which a conventional radiator cooling fan is attached to a fan motor.

[Explanation of symbols]

 1 radiator cooling fan 2 fan boss 2a annular recess 2c outer peripheral wall 2d inner blade 2e vent hole 2f opening 5 fan motor 6 motor shaft 8 radiator

Claims (1)

[Scope of utility model registration request] 1. A fan boss having an annular recess concentric with a center of rotation and fixed to a motor shaft with an opening of the annular recess facing the fan motor side, and between the radiator and the fan motor. In the axial flow type radiator cooling fan to be arranged, a plurality of inner blades are radially provided in the annular recess of the fan boss, and the inner blades of the plurality of inner blades are provided on the outer peripheral wall of the annular recess of the fan boss. A radiator cooling fan, characterized in that a ventilation hole is provided between the ventilation hole and the outside of the fan boss.