JPS6065221A - Cooling device of engine - Google Patents

Abstract

PURPOSE:To enable a fan to be driven without causing any necessity for using the turning torque of an electrically driven motor or an engine so as to eliminate the necessity for a battery while prevent the fan from being restricted by its mounting position, by coupling a rotary shaft of the cross flow fan in a radiator shroud to an oil hydraulic motor and connecting the oil hydraulic motor to an oil hydraulic pump driven by the engine through a selector valve. CONSTITUTION:An oil hydraulic motor 7 is coupled to a cross flow fan 1 arranged along the direction of width of a car body in a radiator shroud 4. Then the oil hydraulic motor 7 is connected to an oil hydraulic pump 6 driven by the output shaft of an engine 5 through a foward path 8 and a return path 11. A selector valve 10 is provided between the forward path 8 and the return path 11, in this way controlling a rotary speed of the fan by controlling an opening of the selector valve in accordance with the temperature of water and the operating condition of a cooler compressor.

Description

[Detailed description of the invention] The present invention relates to an engine cooling device.

Water-cooled and air-cooled engine cooling systems are available. A water-cooled engine has a radiator, and by forcing air into the radiator, cooling water passing through the radiator radiates heat. To force air into the radiator, an axial fan or a cross 70-fan is used.

In the axial flow 7A, the air flow n is circular, whereas in the cross flow 7A, it can be placed along the car body middle blade Io1, so it is possible to send uniform cooling air to the entire surface of the radiator. It is possible.

For this reason, crossflow fans are suitable for long-nose desks with low vehicle height.

An example using a cross flow fan is, for example, Japanese Patent Application Laid-open No. 5
Publication No. 4-110519 and JP-A-57-16311
The disclosure formula is in Publication No. 8. These conventional examples use the rotational torque of an electric motor or an engine as a power source for the cross flow fan. If an electric motor is used, it will have a negative impact on the electronics components of the motor and will require a larger battery or the like. In addition, when using the rotational torque of the engine by directly connecting it to the fan using a belt, there is a high risk of contact between the engine side fan and the crossflow fan casing due to the difference in vibration between the two. The mounting position is also limited by its relationship with the crankshaft.

The present invention is entirely intended to eliminate the above-mentioned disadvantages of the prior art, and basically uses technical means to rotate the crossflow fan by an oil motor. By employing such technical means, for example, the oil pump can also be used as a lubricating oil pump, so the present invention can be applied to existing cooling devices. In general, by selecting the capacity of the oil motor, it becomes possible to employ various cross-flow fans.

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

In FIG. 1, reference numeral 1 denotes a cross flow fan arranged along the inside direction of the vehicle body. Cross 70 - A radiator 2 and/or three cooler condensers are arranged in front of the fan 1. The shroud 4 allows the wind passing through the radiator 2 to cross 70
- Guide the fan 1 to forcefully blow air to the engine 5. The drive system of the cooling device is shown in FIG. An oil pump 6 driven by the output shaft of the engine 5 is connected to an oil motor 7 connected to the shaft of the cross flow fan 1, and the oil from the oil motor spring is returned to the oil pump 6. A filter 9 and a switching valve 10 are provided on an outgoing path 8 from the oil pump 6 to the oil motor 7.

The switching valve 1ofi allows the return path 1 from the oil motor T to the oil pump 6 without supplying the oil flow on the outward path 8 to the oil motor 7.
1 to be short-circuitable. Cross flow fan 1 for outward journey 8
In addition, piping is installed in the width direction of the vehicle at a position in front of or behind the radiator 2 and condenser 3 to cool the oil.

In the example shown in FIG. 3, the oil from the oil motor t is returned to the old oil pan or oil tank 12 and is supplied to the oil motor 7 by the oil pump 6. The switching valve 10 has a water temperature sensor 13 and a cooler compressor high pressure sensor 1.
Its opening and closing are controlled according to No. 4 to No. 16. Through such control, it is possible to blow air according to the engine temperature.
0 is opened, the forward path 8 from the oil pump 6 is short-circuited to the return path 11 from the oil motor 7, and the rotation of the cross flow fan 1 is completely interrupted.

Figure 4 shows the radiator shutter 15 and shroud 4J.
This is an example of a k-town movement. FIG. 5 shows a drive circuit for the cooling device shown in FIG. 4.

A first switching valve 10 and a second switching valve 16 are arranged in parallel with the first switching valve 10 in the outward path 8 from the oil pump 6 to the oil motor 7, and the first switching valve 10 is connected to a water temperature sensor 13 and a cooler compressor high pressure sensor. The opening #l is 1ti by No. 14 to No. 16.
Also, the second switching valve 16 is controlled to close together with the water temperature sensor 13. The first switching valve 10 is connected to the hydraulic motor 7 of the crossflow fan 1 and the drive cylinder 18r of the radiator shutter 15.

Further, the first switching valve 10 is connected directly to the return path 11, so that the oil pump 6 can be short-circuited to the oil tank 12. The second switching valve 16 is connected to the drive cylinder 19 of the movable shroud 4 and can be short-circuited to the return path 11. In the example shown in FIGS. 4 and 5, when the water temperature and high pressure compressor values are sieve, the cross flow fan 1 is operated and the radiator shutter 15 is opened, and when the respective values are low, the first switch 9f10 is activated. The outgoing path 8 is short-circuited to the incoming path 11, the cross flow fan 1 is made inactive, and the radiator shutter 15 is closed, thereby completely interrupting the air blowing to the engine. Similarly, when the vehicle speed is low and the radiator water temperature is high, oil is supplied from the oil pump 6 to all cylinders 19 via the second switching valve 16, and the shroud 4'fr: closes and the cross flow fan 1
)−? 7N Measures-g) Ra, · N Ding -i · Nya · Sota ζ r し n In addition, when the vehicle speed is high, the movable shroud 4 and radiator shutter 15 are fully opened, and the cross flow is fan 1
The system is deactivated and the wind cut by the car is sent to the engine.

As shown in FIG. 4, the lower end of the upper movable shroud 4 is arranged to be located in front near the horizontal plane passing through the center of the rotation axis of the cross flow fan 10, and when opened, moves to the position shown by the imaginary line, and When the lower shroud 20 is disposed below the shroud 20 substantially parallel to the horizontal plane, the cross-flow fan 1 is rotated counterclockwise in order to reduce the rotational resistance due to the wind of the cross-flow fan and increase the air blowing efficiency. . On the other hand, as shown in FIG. Rotate clockwise.

In order to completely prevent overcooling of the engine even when the engine speed is high, the speed of the cross flow fan 1 is suppressed, and
When the engine temperature is high even though the engine speed is low (for example, during idling), it is necessary to ensure the speed of the cross 70-7 un1 as much as possible. Therefore, as shown in FIG. 7, there is a gap between the engine output shaft and the oil pump 6.
All fluid couplings 21 are installed.

A slipping phenomenon occurs in the fluid coupling 21 when the rotational speed of the engine output shaft exceeds a certain value, and the noise at the maximum rotational speed of the oil pump 6 is suppressed to a constant value, and the transmission efficiency of rotational torque at low rotational speeds of the engine is also good. As a result, the cross-flow fan rotation speed (Nf) with respect to the engine rotation speed (NE) VC as shown by the solid line in FIG. 8 is obtained. As is clear from the figure, the number of rotations of the crossflow fan can be suppressed by 10 times when the engine is running at high speeds, and the minimum number of rotations of the crossflow fan can be secured when the engine is at low speeds. 7 is substantially the same as the example shown in FIG. 3 except that the fluid coupling 21 is arranged, so it is easy to use! Il+ is the same as the example shown in FIG. 3, and a complete explanation thereof will be omitted. Instead of a fluid coupling, use a variable type where the amount of oil discharged from the hydraulic pump 6 is not directly proportional to the engine speed;
The same effect may be obtained.

In order to more reliably secure the rotation speed of the cross 70-fan 1 when the engine speed is low and the engine temperature is high, an electric motor that operates only in this state is connected to the cross flow fan 1. Yes, in this case,
By operating the electric motor, it is possible to generate even more cooling air noise to the engine. How to make an electric motor like this
huIt does not have a negative effect on other electronics auxiliary materials, and there is no need to make batteries or alternators more expensive.

The capacity of the oil motor is t, so that the engine cooling water is at near-temperature and can be supplied with the cooling upwind cross flow of 7 am required during engine ignition/starting without installing an electric motor.
-m can also be formed. Even in this case, since the fluid coupling functions to prevent fluid from flowing, overcooling of the engine can be prevented.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a side view of one example of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an explanatory diagram showing an operating circuit, Fig. 4 is a side view showing another example, FIG. 5 is an explanatory diagram showing the operating circuit, FIG. 6 is a side view showing the example shown in FIG. 5 with the shroud installed differently, FIG. 7 is a side view showing another example, and FIG. The figure is a diagram showing the relationship between the engine rotation speed and the rotation speed of the cross flow 7a/. . In the diagram: 1...Crossflow fan, 2...Radiator, 4...Movable shroud, 5...
・Engine, 6...Oil pump, T...Oil motor, 1
0.16...Switching valve, 13,14.17...Sensor, 15...Radiator shutter. Agent Patent Attorney Hideaki Kuwahara

Claims (2)

[Claims] (1) A cross flow fan placed close to the radiator and inside the shroud? An engine cooling device comprising: a rotating shaft of the cross fan J-fan is connected to an oil motor; an oil valve driven by an output shaft of the engine is connected to the oil motor; An engine cooling system characterized in that a switching valve is disposed between the switching valve and the switching valve, and opening/closing control of the switching valve operates the oil motor to control rotation of the cross flow fan. (2) The engine cooling device according to claim (1), wherein the switching valve is controlled to open and close depending on at least the temperature of engine cooling water.