JPH0536029U - Vehicle fan malfunction prevention structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to eliminate the malfunction of the fan that forcibly cools the core part of the radiator and to optimize the operation efficiently and in accordance with the temperature rise of the cooling water. A low-speed rotation of a fan attached to a coupling by connecting a rotary shaft integrated with a coupling to a drive shaft of an internal combustion engine and fixing an axial fan at the tip of the rotary shaft in front of the coupling. Can simultaneously rotate the axial fan to remove the heated air that accumulates in front of the central portion of the coupling containing the thermal valve.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a structure for preventing malfunction of a fan provided behind a radiator in an engine room of a vehicle.

[0002]

[Prior Art]

 Conventionally, in a vehicle cooling structure, particularly in cooling a radiator that cools cooling water circulating in an internal combustion engine, in order to prevent overheating caused by overheating of the cooling water, a drive shaft of the internal combustion engine is connected behind the radiator. Is equipped with a thermal valve that connects and disconnects the fluid circuit, and is equipped with a fan together with a shroud that guides the airflow drawn from the opening in the front of the vehicle, and passes through the radiator. Depending on the temperature condition of the cooling flow, the clutch mechanism in the coupling is intermittently operated to drive the fan to cool the core part that constitutes the radiator and to maintain a constant temperature. Some of them are common.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional type, the coupling, to which the fan forcibly driving the cooling of the core part of the radiator is attached, has a clutch mechanism that is usually built-in according to the temperature rise on the front surface of the coupling. If it is not connected, it normally rotates at several hundred revolutions / minute, but it rotates at 1000 to 3000 revolutions / minute due to the connection of the clutch mechanism in the above coupling, and the outside air flows from the vehicle opening in front of the radiator. This is a thermosensitive valve that detects the temperature rise of the cooling water in the radiator and judges the drive of the fan attached to the coupling by sweeping and cooling the core part of the radiator to a constant temperature. Is built in the front of the center of the coupling, and can detect the temperature rise in front of the center of the coupling. Therefore, the clutch mechanism in the coupling is engaged and disengaged, and the clutch mechanism is not engaged or disengaged directly from the temperature of the cooling water flowing through the radiator core. The airflow discharged from the inside to the outside of the vehicle compartment stays in front of the coupling, and it is not possible to operate the fan sufficiently reliably.

Further, since the operation of the fan cannot be accurately performed by following the temperature change of the cooling water, when a rapid temperature change occurs due to the operation of the internal combustion engine at high speed, there is a risk of overheating or the like. And output loss of the internal combustion engine due to fan drive.

Further, for example, when the fan operates in a long idling state during traffic jam, even if the outside air is guided to the rear of the fan by the sweep of the outside air by the fan, in the front of the central portion of the coupling to which the fan is attached, Immediately after the superheated air is accumulated and the fan is not operating and starts immediately after idling, the air around the core of the radiator that is overheated in this idling state is overheated, and There is a problem that the thermal valve inside the coupling carelessly senses the stagnant air, causing malfunction of the fan.

Therefore, a shroud for an engine fan is provided behind the radiator, and a motor fan operated by a motor is arranged in front of the engine fan in the shroud (Shokai Sho 60-69320). , A fan disposed at the front end of the engine is held with a constant space in a cylindrical protrusion that is integral with the cooler together with a rotating shroud that rotates integrally with the fan (JP-A-56-56926). However, in the case of Japanese Utility Model Laid-Open No. 60-69320, the drive system of the separate motor for driving the motor fan is not limited to hydraulic or electric, but the structure is complicated. In addition to the increased weight, the presence of the motor itself impedes the flow of cooling air, and if the motor itself is a heating element, especially if it is an electric motor. There is a drawback that the rectifying section generates a large amount of heat and the temperature rise due to the motor, which is the heating element, easily causes a problem in cooling the internal combustion engine.

On the other hand, in the case of Japanese Patent Laid-Open No. 56-56926, a rotating shroud arranged around the fan is used to reduce fan noise. The rotating shroud enhances cooling efficiency. It does not seek to ensure proper fan operation.

[0008] Therefore, the present invention aims to improve the drawbacks of the above-mentioned conventional one, and to prevent the malfunction of the fan driven by the coupling with a simple structure, thereby accurately and surely cooling the internal combustion engine. It is something to try.

[0009]

[Means for Solving the Problems]

 Therefore, a rotary shaft that is integral with the fan coupling is connected to the drive shaft of the internal combustion engine, and an axial fan with an outer diameter smaller than the outer diameter of the coupling is provided at the tip of this rotary shaft in front of the coupling. It is provided.

[0010]

[Action]

 Since the axial fan that introduces the airflow to the coupling is driven by the rotary shaft that is integrated with the drive shaft of the internal combustion engine through the coupling, it has a simple structure. In addition, since the thermosensitive valve that determines the drive of the fan is located immediately before the coupling that has a built-in central part, the coupling is made possible by the axial fan fixed at the tip of this rotating shaft. Even if the air heated by the radiator stays in the center of the radiator, it can be reliably removed by this axial fan, so that the air heated by the cooling water passing through the core of the radiator can be removed. Since it comes into contact with the heat-sensitive valve built in the center of the coupling, the fan can be driven accurately and reliably as the temperature of the cooling water rises.

[0011]

【Example】

 The invention will be further described with reference to the embodiments shown in the drawings. (1) is a vehicle fan malfunction prevention structure according to an embodiment of the present invention. This vehicle fan malfunction prevention structure (1) is arranged in front of an engine room and cools an internal combustion engine. A radiator (2) that cools water by passing it through a core part (3) and behind the radiator (2) against overheating of cooling water flowing through a core part (3) of the radiator (2). It is composed of a fan (4) that forcibly introduces the outside air to cool the core part (3) of the radiator (2), and a shroud (5) that guides the drawn outside airflow toward the fan (4). It is something.

In front of the fan (4), the rotary shaft (6) integrated with the clutch (7) penetrates through the rear surface of the coupling (8) led out from the internal combustion engine, and the central part ( 9) has a built-in heat-sensitive valve for judging the drive of the fan (4), and the front end of the rotary shaft (6) is located in front of the central part (9) of the coupling (8) having the fan (4) attached. An axial fan (10) having an outer diameter smaller than the outer diameter of the coupling (8) is mounted and fixed on the shaft.

Since the present invention has the above-mentioned structure, the shaft for introducing the airflow is introduced into the central portion (9) of the coupling (8) containing the thermosensitive valve for judging the driving of the fan (4). The flow fan (10) is derived from the internal combustion engine and is directly driven by the rotating shaft (6) integrated on the back surface of the coupling (8) connected to the fan (4). Can be simple.

Furthermore, in front of the central portion (9) of the coupling (8) to which the fan (4) is attached, the coupling (8) led out from the internal combustion engine and provided with the fan (4) is integrally formed. The axial flow fan (10) integrally attached to and held by the rotating shaft (6) comprises a fan (4) with respect to the central portion (9) of the coupling (8) having a built-in direct thermal valve. When the fan rotates at low speed, the axial fan (10) simultaneously rotates to blow in the intake air to cool it, so that the central part of the coupling (8) generated by driving the fan (4). The cup to which the fan (4) is attached is caused by the movement of the overheated air in the core (3) of the radiator (2) due to the temperature rise of the cooling water that has risen due to the staying of the overheated air in (9) or a long stoppage. Ring (8) This prevents the fan (4) from malfunctioning due to a misjudgment of the heat-sensitive valve built into the center of the radiator, and responds appropriately to the rise in the temperature of the cooling water flowing through the core (3) of the radiator (2). Since the operation can be ensured, the loss of horsepower generated by the internal combustion engine due to the operation of the fan (4), the noise generated due to the operation of the fan (4), and the structure of the cooling system by improving the cooling efficiency Can be miniaturized.

The outer diameter of the axial fan (10) is set to be smaller than the outer diameter of the coupling (8) only at the rear of the radiator (2) excluding the front surface of the coupling (8). The space formed between the fan and the front surface of the fan (4) is an effective sweep space for the cooling airflow of the fan (4), which prevents interference with this space and is formed on the front surface of the coupling (8). Since the cooling airflow can be guided to the low-pressure space by the shape of the axial fan (10), it is smaller than the outer diameter of the coupling (8).

The axial fan (4) fixed to the tip of the rotary shaft (6) derived from the internal combustion engine is located in front of the central portion (9) of the coupling (8) mounted together with the fan (4). Since the power of the internal combustion engine is used as the power source for removing the accumulated heated air and the power of the internal combustion engine is used as the power source, the efficiency of removing the accumulated heated air is high. As another example of the shape of the axial fan (10) for sucking the outside air, it is necessary to perform well. Therefore, the surface of the body (11) forming the axial fan (10) is curved to form the shaft. The suction air sucked by the flow fan (10) is guided to the entire central part (9) of the coupling (8) by this curved surface (Fig. 2), the outer circumference of the axial flow fan (10). On Sabschlau It is conceivable that the air conditioner (12) is integrated to efficiently guide the air flow sucked by the axial fan (10) to the central portion (9) of the coupling (8) (FIG. 3).

[0017]

[Effect of the device]

 As described above, at the center of the front side of the coupling with the fan attached, in front of the coupling with the rotary shaft connected to the drive shaft of the internal combustion engine, the outer diameter of the coupling is smaller than the outer diameter of the coupling at the tip of the rotary shaft. By mounting and fixing the outer diameter axial flow fan, it is possible to judge the drive of the fan and optimize the operation of the thermal valve built in the center of the coupling. It has the excellent effects that it is possible to prevent the horsepower loss of the internal combustion engine due to the driving, reduce the noise accompanying the driving of the fan, and achieve the downsizing of the cooling system itself by efficient cooling.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of essential parts showing a cooling structure according to an embodiment of the present invention.

FIG. 2 is another embodiment of the axial fan used in the present invention.

FIG. 3 is another embodiment of the axial fan used in the present invention.

[Explanation of symbols]

 1 Cooling structure of vehicle fan 2 Radiator 3 Core part 4 Fan 5 Shroud 6 Rotating shaft 7 Clutch 8 Coupling 9 Central part (of coupling) 10 Axial fan 11 Body part (of axial fan) 12 Sub-shroud

Claims (1)

[Scope of utility model registration request] 1. A drive shaft of an internal combustion engine is connected with a rotary shaft which is integral with a coupling of a fan, and an axial flow having an outer diameter smaller than the outer diameter of the coupling is provided at the tip of the rotary shaft in front of the coupling. A malfunction prevention structure for a vehicle fan that is provided with a fan.