JPS595828A - Motor-driven fan for automobile - Google Patents

Abstract

PURPOSE:To lower the specific fuel consumption of an engine, by connecting a motor-driven fan for cooling a radiator and capacitors of an automobile to a motor shaft via a one-way clutch, and thereby making an efficient use of ram pressure produced at the time when the automobile is running at a high speed. CONSTITUTION:The fixed part 5a of a bearing 5 is press fitted to the shaft 3 of a motor 1 while its rotatable part 5b is press fitted to a hole 2a of a fan 2. Further, a coil spring 6 is fitted around the motor shaft 3 in the manner that one end 6a of the extension is fixed in a stopper hole 2b of the fan 2. With such an arrangement, when ram pressure produced by the running of a vehicle is acted in the direction of an arrow shown in the drawing at the time of stopping the motor 1, the fan 2 is turned clockwise as viewed from the direction of the arrow, which causes increase in the diameter of the winding of the coil spring 6 and loosening of the engagement between the motor shaft 3 and the coil spring 6. Therefore, the fan 2 is allowed to idle in a clockwise direction as viewed from the direction of the arrow, by the aid of the bearing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal fan for an automobile, and more particularly to a mounting structure for a fan to a motor shaft in an electric fan for cooling a radiator and a condenser of an automobile.

As a conventional electric fan for automobiles, there is one shown in FIG. 1, for example. That is, in the figure, 1 is a motor and 2 is a fan, which are integrally attached to the shaft 3 of the motor 1 via an insert 4.

However, in such a conventional automobile fan, since the 7-an 2 is integrally attached to the motor 1 and 13, it rotates only by the driving force of the motor 1, and does not rotate while the car is running. Cooling is performed using motor stop running ram pressure. If the motor is small, e.g. 7
When the power was around 0 watts, the fan fixed to the motor was rotated by the ram pressure and there was little resistance, so there was no problem, but as the motors are now lined up and the power is 160 watts, it is difficult to turn the fan fixed to the motor. As the wind speed decreased, it became impossible to expect the cooling effect originally aimed at using ram pressure.

The present invention has been made in view of these conventional problems, and has been developed for use in cooling automobile radiators and condensers.
In an electric 7-amp, the fan is installed so that it can rotate freely in one direction with respect to the motor shaft and is fixed in the opposite direction.
When the motor is stopped, the fan can be rotated by the vehicle's running ram pressure, thereby making effective use of the running ram pressure, shortening the driving time of the motor and reducing fuel consumption. .

Hereinafter, the present invention will be explained based on the drawings.

FIGS. 2 and 3 are diagrams showing one embodiment of the present invention.

Note that parts that are the same as those in the prior art are given the same reference numerals and their explanations will be omitted.

The fixed side 5a of the bearing 5 is press-fitted onto the shaft 3 of the motor 1, and the mounting hole 2 of the fan 2 is fitted onto the rotating side 5b of the bearing 50.
a is press-fitted. A coil spring 6 is wound around the motor shaft 3, and an end portion of one end extension 6a of the coil spring 6 is locked in a locking hole 2b of the fan 2. 7 is the motor 11 ] 3 has several coil springs attached to it 6
The one removed is a snap ring.

When the motor 1 is stopped and the vehicle's running ram pressure is applied from the direction of the arrow, the fan 2 rotates clockwise when viewed from the direction of the arrow, and the winding diameter of the coil spring 6 increases to connect with the motor shaft 3. is loosened, and the fan 2 can rotate clockwise as viewed from the direction of the arrow via the bearing 5. On the other hand, motor 1 is driven and motor @
When fan 3 rotates clockwise when viewed from the direction of the arrow, the diameter of the front coil spring 6 decreases, and the spring 6 and motor shaft 3 are coupled to rotate the fan 2 clockwise when viewed from the direction of the arrow. It has become. That is, the fan 2 is attached to the motor shaft 3 so as to be rotatable in one direction and fixed in the opposite direction.

Next, the effect will be explained.

When the car is running, even if the motor 1 is stopped, the fan 2 rotates idly relative to the motor shaft 3 due to the running ram pressure.
It can blow air to the rear radiator and condenser to cool them. In this case, the fan can be smoothly rotated in the same direction as the blower motor, regardless of the motor. Therefore, since the motor 1 is stopped during this time, fuel consumption can be saved.

On the other hand, when the motor 1 is driven, the fan 2 rotates because it is integrally connected to the motor shaft 3 via the coil spring 6, and this also sends air to the two rear radiators and the condenser to cool them. It is.

However, the motor 1 may be driven even when the car is running, and even in this case, the fan 2 is given υ rotational force by the running ram pressure, so the load on the motor 1 is light, and fuel consumption can be reduced in the end. Demeru.

As explained above, according to the present invention, two
In electric fans for cooling radiators and condensers, the fan is mounted so that it can rotate in one direction with respect to the motor shaft and is fixed in the opposite direction, making effective use of the vehicle's running ram pressure. Shorten motor drive time 4
@) The effect of reducing fuel consumption can be obtained.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional side view of a conventional electric fan for automobiles;
The figure is a longitudinal sectional side view of a dynamic fan for an automobile according to the present invention, and FIG. 3 is a front view thereof. 1...Motor, 2...Fan, 3...Motor shaft, 6...
···coil spring.

Claims (1)

[Claims] Automobile Radie! and an electric fan for a motor vehicle for cooling a condenser, characterized in that the fan is mounted so as to be rotatable in one direction with respect to a motor shaft and fixed in the opposite direction.