JP3125347B2 - Radiator shroud - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator shroud disposed between a radiator of a vehicle and a cooling fan.

[0002]

2. Description of the Related Art A radiator shroud arranged between a radiator of a vehicle and a cooling fan for increasing the amount of air passing through the radiator by the cooling fan is disclosed, for example, in Japanese Utility Model Laid-Open No. 61-92718.

FIG. 5 is a rear view of the radiator shroud, and FIG. 6 is a schematic sectional view taken along line AA of FIG.

In FIGS. 5 and 6, reference numeral 21 denotes a radiator fixed to the vehicle body, reference numeral 23 denotes a cooling fan fixed to the engine, reference numeral 30 denotes a radiator fixed to the vehicle body and disposed between the radiator 21 and the cooling fan 23. Shroud. The radiator shroud 30 is connected to the cooling fan 2
3 has a first shroud 22 disposed on the front side (radiator 21 side) and a second shroud 24 disposed so as to face the periphery of the cooling fan 23. The first shroud 22 and the second shroud 24 are connected by a hinge 25, and the second shroud 24 is rotatable around the hinge 25. Also, 2
8 is an actuator, the second shroud 24 is adapted to be rotated by the actuator 28.

FIG. 7 shows that the number of rotations of the cooling fan 23 is nine.
FIG. 4 is a diagram illustrating a relationship between a front wind speed of a radiator 21 and a tip clearance 31 (a distance between a tip end of a cooling fan 23 and a second shroud 24) at 00 rpm and 1000 rpm. As shown in FIG. 7, as the chip clearance 31 becomes smaller, the wind speed at the front of the radiator 21 increases, and the cooling performance improves. this is,
This is because the smaller the chip clearance 31, the more the wind blown by the tip of the cooling fan 23 is prevented. Therefore, it is desirable that the chip clearance 31 be as small as possible.

However, if the chip clearance 31 is fixed at a small value, the cooling fan 23 vibrates due to engine vibration during running of the vehicle and the like.
And the second shroud 24 may come into contact with each other to cause damage or abnormal noise.

Therefore, in the radiator shroud, as shown in FIG.
When the water temperature is 5 ° C. or higher and the vehicle speed is the set vehicle speed (the vehicle speed at which the traveling wind cannot be expected), the second shroud 24 is rotated by the actuator 28 to set the tip clearance 31 to a medium level, Improve cooling performance. When the engine cooling water temperature is low and middle water temperature, and when the vehicle speed at which the traveling wind can be expected is higher than the set vehicle speed, the second shroud 24 is rotated by the actuator 28 to increase the tip clearance 31. ing.

[0008]

However, in the conventional radiator shroud 30, the radiator 21 and the shroud 30 are fixed to the vehicle body, and the cooling fan 23 is fixed to the engine.
When the engine vibrates greatly due to sudden start of the vehicle, sudden braking, climbing over a step, etc., the cooling fan 23 also operates the shroud 30.
It moves greatly with respect to. Therefore, the chip clearance cannot be reduced below the moving amount of the cooling fan 23, and it is not expected to improve the engine cooling performance when idling or when the vehicle speed is low / medium speed where traveling wind cannot be expected. This also had an adverse effect on the improvement (because it was difficult to increase the amount of air passing through the cooler condenser located in front of the radiator).

Therefore, it is conceivable to provide an auxiliary electric fan to increase the amount of cooling air for the engine, but this is not advantageous because it causes a significant cost increase and an increase in fan noise.

[0010]

Means for Solving the Problems To solve the above problems,
Therefore, an invention according to claim 1 is a radiator shroud which is disposed between a cooling fan attached to an engine of a vehicle and a radiator attached to the vehicle body and is attached to the vehicle body, wherein the cooling fan is attached to the engine. between the guide member having a hole in the annular facing the periphery, is disposed between the outer peripheral surface and the radiator inner circumferential surface of the shroud of the guide member, the upper Symbol guide member and the radiator shroud on the basis of the vehicle speed or the engine coolant temperature the and a closed busy and release to open and close means. And this opening and closing hand
The step is composed of an elastic body having a hollow part, and
And opening by contraction or expansion of the hollow part
It is characterized by becoming. Also, it is described in claim 2.
The disclosed invention relates to a cooling fan mounted on a vehicle engine.
Between the radiator and the radiator
Radiator shroud attached to the car body
And attached to the engine and facing the cooling fan
A guide member having an annular hole, and an outer peripheral surface of the guide member
And between the inner surface of the radiator shroud and the car
The guide member and the rail are determined based on the speed or the engine cooling water temperature.
An opening / closing hand that closes and opens the gap between the louver shroud
And a step. The opening and closing means is controlled by the vehicle speed.
Higher than the constant vehicle speed and the engine coolant temperature is higher than the set temperature
That the blockage is performed when the
It is a sign.

[0011]

Therefore, the inventions according to the first and second aspects are provided.
Since both the cooling fan and the guide member are attached to the engine, the cooling fan and the guide member vibrate similarly with the engine vibration. Therefore, since the cooling fan and the guide member do not contact each other, the space between the guide member and the cooling fan is extremely narrow,
It is possible to sufficiently suppress the wind introduced by the cooling fan tip. In addition, if the opening between the guide member and the shroud is opened by the opening / closing means, fan noise can be reduced, and the amount of air passing through the radiator during high-speed traveling can be increased to improve cooling performance. Further, by closing the guide member and the shroud by the opening / closing means, the cooling performance of the cooling fan during low-speed running can be improved, and the warm-up performance during high-speed running and when the engine cooling water temperature is low is low. Can also be improved .

[0012]

FIG. 1 is a schematic block diagram of one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an engine, and 2 denotes a cooling fan attached to the engine 1. The cooling fan 2 is driven by a belt 4 by rotation of a crank pulley 3 of the engine 1. 5 is a ring-shaped guide member,
This guide member 5 faces the periphery of the cooling fan 2,
The stay 6 is attached to the engine 1. The distance between the guide member 5 and the cooling fan 2 is extremely small, and is smaller than the amount of movement of the cooling fan 2 with respect to the vehicle body due to vibration of the engine 1. This is because when the cooling fan 2 vibrates together with the vibration of the engine 1, the guide member 5 also vibrates similarly to the vibration of the cooling fan 2 and does not contact each other. It can be made narrower.

A radiator 7 fixed to the vehicle body;
Reference numeral 8 denotes a radiator shroud attached to the radiator 7, and the guide member 5 is located on the inner peripheral side of the shroud 8. Reference numeral 9 denotes a ring-shaped elastic body having a hollow portion, and the elastic body 9 is bonded to an inner peripheral surface of the shroud 8 facing the guide member 5. 10 is
A communication hole formed in the shroud 8, 11 is a hose, 12
Is a solenoid valve (opening / closing means), and a hollow portion of the elastic body 9 is connected to a solenoid valve 12 via a communication hole 10 and a hose 11. The solenoid valve 12 is connected to the intake manifold via a check hose 13 via a rubber hose. Also, 14
Is an orifice, and the orifice 14 is formed inside the rubber hose. When the solenoid valve 12 is off, the hose 11 is connected to the check valve 1.
3, connected to the intake manifold via the orifice 14, and when turned on, the hose 11 is connected to the atmosphere open side as shown by the arrow in the figure.

Reference numeral 15 denotes a battery, 16 denotes a start switch which is turned on / off in conjunction with turning on / off of an ignition switch, 17 denotes a low water temperature switch which is turned on when the engine cooling water temperature is low, and 18 denotes a high vehicle speed. This is a high vehicle speed switch that is turned on. Reference numeral 19 denotes a high water temperature switch that is turned on when the engine cooling water temperature is high, and reference numeral 20 denotes a low / medium speed switch that is turned on when the vehicle speed is low / medium. One end of the battery 15 is connected to a start switch 16.
Through the low water temperature switch 17 and the high water temperature switch 19
Are connected to one end of each. Further, the other end of the low water temperature switch 17 is connected to one end of a high vehicle speed switch 18, and the other end of the high vehicle speed switch 18 is connected to the solenoid valve 12. In addition, high water temperature switch 1
9 is connected to one end of a low / medium speed switch 20, and the other end of the low / medium speed switch 20 is connected to a high vehicle speed switch 1.
8 is connected to the solenoid valve 12 together with the other end. Here, the low water temperature switch 17 and the high water temperature switch
In some cases, the cooling water 19 is turned off.
It is assumed that the temperature is in an intermediate temperature state. In addition, the high vehicle speed
Switch 18 and low / medium speed switch 20 are both on or off.
One of them is selectively turned on.
It shall be.

In the above configuration, as shown in FIG. 2, the start switch 16 is turned on, but the low water temperature switch is turned on .
Switch 17 and low / medium speed switch 20 are both off and high
When the vehicle speed switch 18 is on , the solenoid valve 12 is off. In this case, since the negative pressure of the intake manifold is guided to the hollow portion of the elastic body 9, the elastic body 9 is in a flat state as shown in the figure, and the elastic body 9 and the guide 5 are separated from each other. .
In this state, fan noise is reduced, and the amount of air passing through the radiator 7 during high-speed running can be increased to improve cooling performance. In this state, the orifice 14 can prevent the engine 1 from inhaling a large amount of air at a time and causing an engine failure. In addition, the check valve 13 has a function of maintaining the flatness of the elastic body 9 flattened by the negative pressure of the intake manifold even when the negative pressure of the intake manifold is reduced.

Next, as shown in FIG. 1, for example, when both the high water temperature switch 19 and the low / medium speed switch 20 are turned on, the solenoid valve 12 is turned on, and the hollow portion of the elastic body 9 is opened to the atmosphere. . In this case, the elastic body 9 has a normal shape, closes the outer peripheral surface of the guide member 5, and closes the gap between the shroud 8 and the guide member 5. Therefore, when the cooling water temperature is high and the vehicle speed is low / medium speed, as described above, the distance between the guide member 5 and the tip of the cooling fan 2 is small, and the space between the guide member 5 and the shroud 8 is elastic. Since the body 9 is closed, the cooling performance of the cooling fan 2 is improved.

When both the low water temperature switch 17 and the high vehicle speed switch 18 are turned on, the solenoid valve 12 is turned on in the same manner as when both the switches 19 and 20 are turned on. Member 5
And the shroud 8 is closed. In addition, low water temperature switch
Switch 17 and high water temperature switch 19 are both turned off.
If the cooling water temperature is in the middle temperature state
Therefore, the elastic body 9 is in a flat state as in FIG.
The space between the window 8 and the guide member 5 is opened.

FIG. 3 shows that the space between the guide member 5 and the shroud 8 is closed (the closed state is indicated by "small") or opened (the open state is changed to "small") according to the vehicle speed and the cooling water temperature. (Shown as "large"). As shown in FIG. 3, the vehicle speed is low and medium-speed, or One cooling water temperature lay even low
Is large at medium temperature (effectively large chip clearance)
And the fan noise is reduced. And the vehicle speed is low
A medium-speed, or One when cooling water temperature is hot a small (substantially tip clearance is small), and the cooling performance is improved by the cooling fan. Further, a vehicle speed is fast, or One cold <br/> retirement water temperature when the medium temperature or high temperature Daito Ri Na, increases the throughput of the run line style radiator 7, the cooling performance is improved. Further, a vehicle speed is fast, cooling water temperature One or becomes small in the case of low temperature. This is because by closing the space between the guide member 5 and the shroud 8, the amount of high-speed traveling wind passing through the radiator 7 is reduced, and the warm-up performance is improved.

[0020] FIG. 4 is a high speed (approximately 140 km / h) the one embodiment and the conventional against idling time after running example shows a comparison of the temperature change of each part of the (tip clearance 20mm), A ₁ ~A ₃ one example, B ₁ ~B ₃ is a conventional example, a _1, B ₁ is the radiator inlet water temperature, a _2, B ₂ is the vehicle interior middle air temperature, a _3, B ₃ is air temperature balloon cooler central. As shown in FIG. 4, in the case of one embodiment, it is possible to suppress a rise in the temperature of each part and to improve the performance of the cooler as compared with the conventional example.

The guide member 5 may have a slit shape in order to reduce wind resistance.
It may be a mesh.

In the above-described embodiment, the elastic member 9 is usually in a hollow state. However, the elastic member 9 is usually in a flat state, and the guide member is formed by using an elastic member which becomes hollow by filling air. The space between 9 and the shroud 8 may be closed or opened.

[0023]

[0024]

As described above, according to the present invention, according to the invention described in claim 1, attached to the engine, and a guide member having a hole in the annular facing the periphery of the cooling fan, the outer peripheral surface of the guide member and the radiator is disposed between the inner peripheral surface of the shroud, the space between the upper Symbol guide member and the radiator shroud provided with a closed busy and release to open and close means based on the vehicle speed or the engine coolant temperature, the switching means is a hollow portion Have
Composed of an elastic body that closes and opens
Is performed by contraction or expansion of
According to the invention described in claim 2, the opening / closing means includes:
The vehicle speed is higher than the set vehicle speed and the engine coolant temperature is set
In the case where the temperature is lower than the temperature, the closing is performed.
is there. Therefore, the space between the guide member and the cooling fan can be made extremely narrow, and the wind blown by the tip of the cooling fan can be sufficiently controlled to improve the cooling performance of the cooling fan. In addition, if the opening between the guide member and the shroud is opened by the opening / closing means, fan noise can be reduced, and the amount of air passing through the radiator during high-speed traveling can be increased to improve cooling performance. Further, by closing the guide member and the shroud by the opening / closing means, the cooling performance of the cooling fan during low-speed traveling can be improved, and the engine cooling water temperature during high-speed traveling and when the engine cooling water temperature is low is low. Machine performance can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram for explaining the operation of one embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a distance between a guide and a shroud, a vehicle speed, and an engine coolant temperature in one embodiment of the present invention.

FIG. 4 is a graph comparing an embodiment of the present invention with a conventional example.

FIG. 5 is a rear view of a conventional example.

FIG. 6 is a schematic configuration diagram along the line AA of the example of FIG. 5;

FIG. 7 is a diagram showing a relationship between a tip clearance and a wind speed in front of a radiator.

FIG. 8 is a diagram showing a relationship between a tip clearance, a vehicle speed, and a cooling water temperature in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Cooling fan, 5 ... Guide member, 6 ...
Stay, 7 ... radiator, 8 ... radiator shroud,
9 ... elastic body, 12 ... solenoid valve (opening / closing means), 1
5 ... battery, 16 ... start switch, 17 ... low water temperature switch, 18 ... high vehicle speed switch, 19 ... high water temperature switch,
20 ... Low / medium speed switch.

Claims (2)

(57) [Claims] 1. A radiator shroud mounted between a cooling fan mounted on an engine of a vehicle and a radiator mounted on a vehicle body and mounted on the vehicle body, wherein an annular hole mounted on the engine and facing a periphery of the cooling fan. a guide member having said guide member is disposed between the outer surface and the inner circumferential surface of the radiator shroud, closed <br/> between the upper Symbol guide member and the radiator shroud on the basis of the vehicle speed or the engine coolant temperature it includes a busy and an open opening and closing means, and the switching means is formed of an elastic body having a hollow portion,
The closing and opening are performed by contraction or expansion of the hollow part.
A radiator shroud characterized by performing . 2. A cooling fan attached to an engine of a vehicle.
Between the fan and the radiator mounted on the vehicle body.
Radiator shroud attached to the car body
hand, Annular attached to the engine and facing the cooling fan
A guide member with a hole of Outer peripheral surface of the guide member and inner periphery of the radiator shroud
Surface, and based on vehicle speed or engine coolant temperature.
To close the guide member and the radiator shroud.
Opening and closing means for closing and opening; Equipped with This opening / closing means is used when the vehicle speed is higher than the set vehicle speed and the engine speed is higher.
The blockage is performed when the cooling water temperature is lower than the set temperature.
Radiator shroud characterized by the following:
De.