JPS647209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine cooling system, and more particularly to an engine cooling system in which a crossflow fan (or tangential fan) is driven by a motor.

To illustrate the structure of a conventional device of this type, as shown in FIG. 1, an engine 2 is installed in a nose portion 1 at the front of an automobile, and a cross flow fan 4 is driven via a belt 3 by the rotation of the engine 2. is a
It is provided so as to be rotatable in the direction of the arrow. A radiator 5 that receives wind in the direction of arrow b while the vehicle is running is disposed at the forefront, and an upper casing 6 and a lower casing 7 extending rearward from the upper and lower parts of the radiator 5 are provided. It guides the air that has passed through the fan and also covers a part of the cross flow fan 4. The symbol W is the front wheel of the automobile.

In the conventional device having such a structure, the shaft portion 4a of the cross flow fan 4 is connected to the casing 6 or 7.
(In other words, the body of the automobile), but also connected to the engine 2 by the belt 3, the fan 4 receives vibrations from the engine 2 when the engine is operating. At the same time, the vehicle body is also subject to vibrations while driving. On the other hand, since the casings 6 and 7 receive almost only vibration from the vehicle body, the casings 6 and 7
A relative movement occurs between the fan 4 and the fan 4. Here, the gap between the casings 6, 7 and the fan 4 is made as small as possible in order to increase the speed of the air passing through the gap, thereby ensuring a sufficient amount of airflow and increasing the cooling effect. Therefore, when the relative movement occurs, the fan 4 comes into contact with the casings 6, 7, resulting in damage to the fan 4. On the other hand, if the gap between the fan 4 and the casings 6 and 7 is increased in order to prevent damage to the fan 4, the amount of air that should pass cannot be expected to be secured;
Another drawback was that it was not possible to improve the cooling efficiency. Furthermore, the upper casing 6 as shown in FIG.
With the configuration of the lower casing 7, the wind in the direction of the arrow b flows toward the surface formed by the cross flow fan 4 during both running, especially during high speed running, so the fan 4 provides resistance in the reverse rotation direction. However, since the rotation of the fan 4 is hindered, the blowing effect is reduced.

In view of the above-mentioned conventional drawbacks, the present invention installs a separate motor as a drive source for the cross-flow fan installed at the rear of the radiator, prevents engine vibration from being transmitted to the cross-flow fan, and thereby connects the casing and cross-flow fan. The aim is to maintain the relative positional relationship of the radiator and at the same time maintain the cross-flow fan, and also to prevent the rotation of the cross-flow fan from being weakened by the flow of air passing through the radiator core due to vehicle speed. .

Embodiments of the present invention will be described below with reference to the accompanying drawings.

2 and 3 show an embodiment of the present invention, and the same components as in FIG. 1 are given the same numbers. The cross flow fan 4 has its shaft portion 4
The fan drive motor 11 rotates in the direction a around the axis O of a, and this rotation is performed by a fan drive motor 11 shown in the third figure. The motor 11 is a DC motor, and there are flat motors and cylinder motors, either of which may be used. Further, the shaft of the motor 11 and the shaft portion 4a of the cross flow fan 4 are directly connected (another mechanical joint may be interposed), and the rotation speed of the motor 11 is determined by an engine cooling water temperature sensor (not shown). and a compressor high pressure sensor (not shown). The engine cooling water temperature sensor is installed at a portion through which cooling water for cooling the engine passes, and functions to operate the motor 11 to obtain the required air volume in accordance with the temperature of the cooling water. The compressor high pressure sensor senses the pressure of the air conditioner compressor and operates the motor 11 to obtain the required air volume when the pressure exceeds a certain value. In this way, the rotational speed of the crossflow fan 4 is controlled by both of the above-mentioned sensors, thereby preventing the engine 2 from being overheated or overcooled.

A casing K consisting of an upper casing 60, a lower casing 70, and both side casings 61 and 62 (FIG. 3) is installed above and below the cross flow fan 4. The upper casing 60 is arranged so as to extend rearward from the upper part of the radiator 5, and includes a front curved section 60a, a central curved section 60b, and a rear outlet section 60c. A pointed end portion 60d is formed at the joint portion so as to protrude downward. The front curved portion 60a serves to guide the air passing through the radiator 5 due to vehicle speed toward the fan 4, and the central curved portion 60b covers the upper part of the fan 4 to prevent the air from hitting the upper part. act. The reason for covering the top of fan 4 in this way is
When the fan 4 rotates counterclockwise as shown in FIG. 2, the air that has passed through the radiator 5 hits the top of the fan 4, which weakens the rotation of the fan 4. Particularly when the vehicle is running at high speed, the fan 4 is This is because the rotation becomes zero or reverse, preventing the vehicle speed wind from passing through the radiator core and reducing the cooling effect. The pointed end 60d is connected to the radiator 5.
It is located at a position that covers the fan 4 on or above a line B connecting the vertical midpoint A and the axis O of the shaft portion 4a.

On the other hand, the lower casing 70 is arranged to extend rearward from the lower part of the radiator 5, and includes a front straight section 70a, a central curved section 70b covering the lower side of the fan 4, and a rear outlet section 70c extending upward. It consists of

In such a configuration, when the engine 2 is started and the motor 11 is operated (the vehicle is not yet running), the cross flow fan 4 rotates in the direction of the arrow a, and air in front of the radiator 5 is sucked in the direction of the arrow b. direction, both exit portions 60c,
It is discharged through an outlet 80 formed by 70c.

Next, when the vehicle starts running, the speed of the air flowing in the direction of arrow b increases relatively, and especially when driving at high speeds, the air flows in at a high speed.
As shown in the figure, since the tip 60d is formed slightly below the straight line B, the moment due to air resistance in the direction opposite to the a direction does not act on the fan 4, but rather increases the rotation in the a direction. It works like this. Therefore, the cooling effect is not reduced.

On the other hand, as mentioned above, since the motor 11 is connected to the engine cooling water temperature sensor and the compressor high pressure sensor, the rotation speed is controlled by these sensors, and the optimum cooling effect according to the situation at that time is exerted. Ru.

In the above embodiment, the direction of rotation of the cross flow fan 4 was set to the a direction (counterclockwise direction) as shown in FIG. It is possible.

In this way, the present invention includes a radiator and an engine fixed to a vehicle body, a cross flow fan whose axial direction is perpendicular to a direction connecting the radiator and the engine, and which is disposed horizontally between the radiator and the engine; an upper casing located at the top of the crossflow fan, a lower casing located at the bottom of the crossflow fan, and side casings located at both sides of the crossflow fan;
A fan driving motor is arranged in the axial direction of the cross flow fan, and one of the upper casing and the lower casing has a front curved portion connecting the radiator and the cross flow fan, and a part of the outer periphery of the cross flow fan. and a rear outlet portion extending from the crossflow fan toward the engine, and the end of the front curved portion on the crossflow fan side faces away from the crossflow fan. It becomes a pointed end extending in the rotational direction of the cross flow fan, and the other of the upper casing and the lower casing covers a part of the outer periphery of the cross flow fan from the radiator and extends smoothly in the direction of the engine, When the vehicle starts to run, especially when running at high speeds, the wind does not flow directly into the surface formed by the cross-flow fan, so the rotation of the cross-flow fan is not hindered, and the cross-flow fan blows air. You can maintain the appropriate effect. Further, different vibrations such as engine vibration and vehicle body vibration as in the conventional case are not transmitted to the cross flow fan, and therefore, there is no possibility that the casing and the cross flow fan come into contact and damage the cross flow fan. Therefore, the gap between the casing and the crossflow fan can be set narrower, increasing the air volume and improving cooling efficiency. Further, in the present invention, since the cross flow fan is not driven by the engine but by a separately provided motor, a conventional viscous fluid coupling (coupling) is provided to control the rotation speed of the fan. There's no need. Furthermore, no bearings such as bearing brackets are required. In other words, the engine speed can be controlled using a space-saving engine cooling water temperature sensor, compressor high pressure sensor, etc., which is advantageous in a narrow space such as an engine room.

In addition, when a conventional cross flow fan is driven by an engine, the fan and engine must be located close to each other, and furthermore, since the direction of rotation of the crankshaft is parallel to the axis of the fan, the engine It must be horizontally mounted (front-wheel drive engine, commonly referred to as FF). However, since the present invention is driven by a motor, it can be applied regardless of whether the engine is located at the front or rear of the vehicle, and whether the engine is installed horizontally or vertically. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a simplified sectional view of the front part of a vehicle showing a conventional device, FIG. 2 is a simplified sectional view of the front part of a vehicle showing one implementation of the present invention, and FIG. 3 is a plan view of FIG. 2. DESCRIPTION OF SYMBOLS 1...Automobile nose part, 2...Engine, 4...Cross flow fan, K...Casing, 5...Radiator, 6, 60... Upper casing, 7, 70... Lower casing, 11... Fan drive motor.

Claims (1)

[Scope of Claims] 1. A radiator and an engine fixed to a vehicle body, and a cross flow fan whose axial direction is perpendicular to a direction connecting the radiator and the engine and which is disposed horizontally between the radiator and the engine; an upper casing located at the upper part of the cross flow fan, a lower casing located at the lower part of the cross flow fan, side casings located at both sides of the cross flow fan, and arranged in the axial direction of the cross flow fan. one of the upper casing and the lower casing includes a front curved portion connecting the radiator and the cross flow fan, a central curved portion covering a part of the outer circumference of the cross flow fan, and a front curved portion connecting the radiator and the cross flow fan; and a rear outlet section extending from the fan in the direction of the engine, and the end of the front curved section on the side of the crossflow fan has a pointed end facing away from the crossflow fan and extending in the rotational direction of the crossflow fan. An engine cooling device, wherein the other of the upper casing and the lower casing covers a part of the outer periphery of the cross flow fan from the radiator and extends smoothly in the direction of the engine. 2. The engine cooling device according to claim 1, wherein the fan drive motor is a motor whose rotation speed is controlled by an engine cooling water temperature sensor and a compressor high pressure sensor.