JPH0224908Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a radiator for a vehicle, and particularly relates to an improvement of a radiator for a vehicle in which a cooling fan of the radiator is driven by a dedicated motor.

(b) Background of the technology Radiators for vehicles such as automobiles that use electric cooling fans instead of engine-driven cooling fans have appeared, and these electric cooling fans always maintain a constant fan air volume. Therefore, it is possible to obtain sufficient heat dissipation performance even when driving at low speed due to traffic congestion or when idling, and it is possible to reduce fan noise.

(c) Prior art and problems Figure 3 shows this type of conventional radiator for a vehicle equipped with an electric fan, in which 1 is the radiator body, 2
is a shroud attached to the rear surface, a circular hole 4 with a flange 3 is formed in this shroud 2, and an electric fan 5 is located in this circular hole 4 and is attached to the shroud 2 via a support arm 6. At the same time, the impeller 5a of the electric fan 5 is positioned in the flanged circular hole 4, and by rotating the electric fan 5, ventilation for cooling the radiator is generated (for example, the impeller 5a of the electric fan 5 is installed in the flanged circular hole 4). -Refer to No. 23443).

In such a conventional radiator cooling system, the radiator can exhibit sufficient heat dissipation performance even when driving at low speeds as described above, but this electric fan 5
Generally, the radiator is operated only when driving at low speeds such as when idling or in extreme traffic jams, and is kept in a stopped state during normal driving or high speed driving, and the radiator is cooled by the wind at the speed of the vehicle. In this case, the circular hole 4 of the shroud 2 serves as a discharge port for the vehicle speed wind, but since the impeller 5a of the electric fan 5 is located inside this circular hole 4, this is a kind of outlet that suppresses the discharge of the vehicle speed wind. This acts as a baffle plate, which increases the pressure inside the shroud 2, increasing the ventilation resistance of the radiator, reducing the heat dissipation performance of the radiator, and reducing wind noise passing through the circular hole 4. There is a growing problem.

In addition, in order to eliminate the above problem, shroud 2
It is conceivable to provide an opening for the vehicle speed wind to pass through, or to enlarge the circular hole 4 in which the impeller 5a of the electric fan 5 is located, but in this case, the impeller 5a
Therefore, the capacity of the electric fan 5 increases, power consumption increases, and the cooling mechanism of the radiator increases in size.

Therefore, the applicant provided an electric fan that can move forward and backward with respect to the radiator, and when cooling with this electric fan, it is moved forward by the thrust of the electric fan drive and positioned in the circular hole of the shroud, and when cooling with wind at vehicle speed, the ram pressure Developed a technology to open a circular hole by retracting the electric fan.
As shown in No. 43948, an application has already been filed.

However, since electric fans of this type are left in a free state, they inadvertently slide forward or backward due to inertia when the vehicle starts or stops running, and noise is generated due to collisions at that time. others,
There was also a problem with durability.

(d) Purpose of the invention This invention was made to solve the conventional problems as mentioned above, and its purpose is to:
When the electric fan that can move forward and backward into the circular hole for ventilation in the shroud is not in operation, the electric fan is forcibly held in the retreat position to prevent the electric fan from accidentally sliding, and to reduce ventilation resistance and air flow when the radiator is cooled by air at vehicle speed. An object of the present invention is to provide a radiator for a vehicle designed to reduce noise.

(e) Structure of the invention In order to achieve the above object, the vehicular radiator of the invention comprises a radiator body, a shroud which is attached to one side of the radiator body so as to cover it and has a circular hole for ventilation, and this shroud. a cooling bracket mounted opposite to the circular hole; and a cooling bracket supported by the bracket so as to be movable in and out of the circular hole, and moved forward by the thrust of the impeller during movement to position the impeller within the circular hole. an electric fan; a plunger that fixes and holds the electric fan at the rearward end and opens the circular hole when the electric fan is not in operation; It is composed of a detection switch that de-energizes the plunger during operation.

(F) Example of the invention An example of the invention will be described below with reference to FIGS. 1 and 2.

In Fig. 1, 10 is the radiator body, 11
The core part 10a is attached to the rear surface of the radiator main body 10.
This is a shroud attached to cover the entire area, and a circular hole 13 with a flange 12 is formed in the center of this shroud 11.
3 serves as a discharge port for the cooling air that has passed through the radiator main body 10.

On the axis of the circular hole 13 of the shroud 11, a bracket 1 is located rearward of the circular hole 13.
The bracket 14 is integrally supported by the shroud 11 by a plurality of support arms 15, and the bracket 14 has a plurality of guide rods 16 parallel to the axis of the circular hole 13. A ring-shaped support member 17 is attached to the guide rod 16 so as to be slidable in the front-rear direction, and stoppers 18 and 19 for regulating the amount of movement of the support member 17 in the front-rear direction are integrally provided. ing.

The support member 17 thus constructed has an electric fan 2
An electric motor 20a constituting 0 is fixed integrally. Further, an electromagnetic plunger 21 is attached to the bracket 14, and the tip of the movable rod 21a of the electromagnetic plunger 21 is connected to the support member 17, so that when the electromagnetic plunger 21 is excited, the electric fan 20 is held in the retracted position. However, the impeller 20b of the electric fan 20 is positioned outside the circular hole 13 to open the circular hole 13.

FIG. 2 shows a control circuit for the electric fan 20 and the electromagnetic plunger 21. The electric motor 20a and the electromagnetic plunger 21 of the electric fan 20 are connected in parallel to the terminals 22 and 23 of a DC power source such as a battery, and the electric motor A detection switch, for example, a normally open contact 24a of a thermoswitch 24 is connected in series to the power supply line of the electromagnetic plunger 20a.
A normally closed contact 24b of a thermoswitch 24 is connected in series to the power supply line No. 1. The thermoswitch 24 is operated depending on the temperature of the radiator and engine.

Next, the operation of this embodiment configured as described above will be explained.

First, the temperature of the radiator etc. is set to thermo switch 2.
When the temperature is lower than the set temperature in step 4, the normally open contact 24a of the thermoswitch 24 opens and the normally closed contact 24b opens.
is closed, the electromagnetic plunger 21 is excited by the (+)-contact 24b-electromagnetic plunger 21-(-) closed circuit, which causes the movable rod 21a to
is sucked and slid in the direction shown by the arrow X1 in FIG. Therefore, the impeller 20b of the electric fan 20 is positioned outside the circular hole 13, as shown by the solid line in FIG. 1, and opens the circular hole 13. Therefore, the ventilation resistance of the radiator core portion 10a when the vehicle is running is reduced compared to the conventional electric fan fixed type.
The radiator core portion 10a can be efficiently cooled by the vehicle speed wind. Since the entire electric fan 20 is held in a fixed state by the electromagnetic plunger 21, the electric fan 20 will not be inadvertently slid in the advance/retreat direction due to inertia even when the vehicle starts and stops running.

Next, the case where the radiator is cooled by the electric fan 20 will be described. In this case, if the vehicle is driven at low speeds due to extreme traffic jams, or when driving under the scorching sun, sufficient heat dissipation performance may not be obtained with the wind at the vehicle speed, and as a result, the temperature of the radiator, etc. may exceed the set temperature of the thermo switch 24. , the thermoswitch 24 operates to close its normally open contact 24a and open its normally closed contact 24b. When the normally closed contact 24b is opened, the electromagnetic plunger 21 is demagnetized and the restraining force on the electric fan 20 is released. Then, by closing the normally open contact 24a, (+) - contact 24a - motor 20a - (-)
The electric motor 20a is energized through a closed circuit. Electric motor 2
When the electric motor 20a is started by energizing 0a and the impeller 20b is rotated in the air suction direction, the electric fan 20 moves over the guide rod 16 in the direction of arrow X2 (forward direction) in FIG. 1 due to the thrust of the impeller 20b.
The support member 17 is slid to a position where it abuts against the stopper 18, and the impeller 20b is thereby stopped.
is located within the circular hole 13 of the shroud 11, as shown by the two-dot chain line in FIG. and,
As the electric fan 20 rotates, the radiator core part 1
0a will be efficiently cooled.

In the above embodiment, a case where the present invention is applied to a suction type electric fan is described, but a pusher type electric fan, that is, a type in which the electric fan is disposed in front of the radiator body, is also possible. Further, in the above embodiment, the electric motor 20a and the electromagnetic plunger 21
Although the case has been described in which the thermo switch 24 is used for the control, a pressure switch that detects the pressure inside the radiator, a speed switch that detects the speed of the engine, etc. may also be used. Further, an air cylinder may be used instead of the electromagnetic plunger 21.

(g) Effects of the invention As explained above, according to the invention, when the electric fan is not operating, the electric fan is forcibly held backward by the plunger to open the circular hole in the shroud, thereby reducing vehicle speed wind cooling. The ventilation resistance of the radiator does not increase when the vehicle is moving, and the vehicle can be efficiently cooled by the wind at the speed of the vehicle, and the noise caused by the passing wind can be reduced. In addition, since the impeller slides to the appropriate position when the electric fan is in operation, the radiator can be efficiently cooled by the electric fan, and the radiator can be constructed with a shroud over its entire surface, allowing for small-capacity electric motors. By reducing the capacity of the electric motor, it becomes possible to save energy and downsize the slide mechanism. Furthermore, when the electric fan is not in operation, it is held fixed by the plunger in the reverse position, which eliminates the electric fan's inadvertent sliding due to inertia when starting or stopping the vehicle, which is advantageous in terms of noise and durability. Become.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view of a vehicle radiator according to the present invention, FIG. 2 is a control circuit diagram of an electric fan and plunger according to the present invention, and FIG. 3 is a longitudinal side view of a conventional vehicle radiator. 10...Radiator body, 11...Shroud, 13...Circular hole, 14...Bracket, 15
...Support arm, 16...Guide rod, 17...
... Support member, 20 ... Electric fan, 20a ... Electric motor, 20b ... Impeller, 21 ... Plunger,
24...Thermo switch (detection switch).

Claims (1)

[Scope of utility model registration request] a radiator body; a shroud that is attached to one side of the radiator body so as to cover it and has a circular hole for ventilation; a bracket attached to the shroud opposite to the circular hole; a cooling electric fan that is supported so as to be movable and retractable, and moves forward with the thrust of an impeller during motion to position the impeller within the circular hole; and when the electric fan is not in operation, the electric fan is fixedly held at the retreating end; A vehicle comprising: a plunger that opens the circular hole; and a detection switch that energizes the plunger when the electric fan is not operating and deenergizes the plunger when the electric motor is operating. radiator.