JPH0218404B2 - - Google Patents

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. An axial flow fan or cross flow fan is used to force air into the radiator. In axial flow fans, the air flow is circular, while in crossflow fans,
Since it can be arranged along the width direction of the vehicle body, it is possible to send uniform cooling air to the entire surface of the radiator. For this reason, for long nose cars with low vehicle height,
Crossflow fans are preferred.

An example using a crossflow fan is, for example,
JP-A-54-110519 and JP-A-57-163118
Disclosed in the publication No. These conventional examples use the rotational torque of an electric motor or an engine as a power source for the cross flow fan. When an electric motor is used, the load on the battery and alternator increases, which adversely affects other electronic auxiliary equipment and requires a larger battery or the like. or,
When using the rotational torque of the engine by directly connecting it to the fan using a belt, there is a high risk that the fan on the engine side and the crossflow fan casing on the vehicle body will come into contact due to the difference in vibration between the two, and the installation of the crossflow fan Its position is also limited by its relationship to the crankshaft.

This invention is intended to solve the above-mentioned problems of the prior art.Basically, an oil pump driven by an engine is connected to an oil motor that drives a crossflow fan, and the oil pump is connected to the hydraulic circuit. A technical means is used to connect the cylinders for controlling the opening and closing of the shroud and radiator shutter. Adoption of this technical means makes it possible to control the oil temperature of the oil discharged from the oil pump using a cross flow fan, making it possible to eliminate the need for an oil cooler.

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 width direction of the vehicle body. A radiator 2 and/or a cooler condenser 3 are arranged in front of the crossflow fan 1. The shroud 4 guides the wind passing through the radiator 2 to the crossflow fan 1,
Forcibly blow air to 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 return oil from the oil motor is returned to the oil pump 6. oil pump 6
A filter 9 and a switching valve 10 are provided on the outward path 8 from the oil motor 7 to the oil motor 7. The switching valve 10 allows the flow of oil on the outward path 8 to be short-circuited to the return path 11 from the oil motor 7 to the oil pump 6 without supplying the oil flow to the oil motor 7. The outward path 8 is piped in the width direction of the vehicle at a position in front or behind the cross flow fan 1 or the radiator 2 and condenser 3 to cool the oil.

In the example shown in FIG. 3, oil from the oil motor 7 is returned to the oil pan or oil tank 12, and the oil is supplied to the oil motor 7 by the oil pump 6. The switching valve 10 has its opening and closing controlled in response to signals from a water temperature sensor 13 and a cooler compressor high pressure sensor 14. Such control makes it possible to blow air according to the engine temperature. That is, for example, during engine cooling, the switching valve 10
is opened, and the outgoing path 8 from the oil pump 6 is connected to the oil motor 7.
The return path 11 from the cross flow fan 1 is short-circuited, and the rotation of the cross flow fan 1 is interrupted.

FIG. 4 shows an example in which the radiator shutter 15 and the shroud 4 are movable. FIG. 5 shows a drive circuit for the cooling device shown in FIG. 4. During the outgoing path 8 from the oil pump 6 to the oil motor 7, the first switching valve 10
A second switching valve 16 is arranged in parallel with the valve, and the opening and closing of the first switching valve 10 is controlled by signals from the water temperature sensor 13 and the cooler compressor high pressure sensor 14. The opening and closing of the valve 16 is controlled according to signals from the water temperature sensor 13 and the vehicle speed sensor 17. The first switching valve 10 is connected to the hydraulic motor 7 of the crossflow fan 1 and the drive cylinder 18 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 high, the cross flow fan 1 is activated and the radiator shutter 1 is activated.
5 is opened, and when each value is low, the first switching valve 10 short-circuits the outgoing path 8 to the incoming path 11, deactivates the cross flow fan 1, and closes the radiator shutter 15 to blow air to the engine. interrupt. When the vehicle speed is low and the radiator water temperature is high, the oil from the oil pump 6 is supplied to the cylinder 19 via the second switching valve 16, the shroud 4 is closed, and the cross flow fan 1 and the open radiator shutter 5 are used to supply the oil from the oil pump 6 to the cylinder 19. Sends cooling air. Further, when the vehicle speed is high, the movable shroud 4 and the radiator shutter 15 are opened, and the cross flow fan 1 is deactivated to send the wind cut by the vehicle to the engine.

As shown in Figure 4, the upper movable shroud 4
The lower end of the shroud 20 is arranged to be located in front near the horizontal plane passing through the center of the rotation axis of the cross flow fan 1, and moves to the position shown by the imaginary line when opened, and the lower shroud 20 extends approximately parallel to the horizontal plane. 20, the cross-flow fan 1 is rotated counterclockwise in order to reduce the rotational resistance of the cross-flow fan due to the wind and increase the air blowing efficiency. On the other hand, as shown in FIG. 6, when the front of the lower shroud 20 extends near the horizontal plane and the lower end of the movable shroud 4 is located slightly behind the crossflow fan 1, the crossflow fan 1 Rotate clockwise.

In order to prevent overcooling of the engine even when the engine speed is high, the speed of the crossflow fan 1 is suppressed, and if the engine temperature is high even when the engine speed is low (for example, when idling), the It is necessary to ensure the rotational speed of the flow fan 1 as much as possible. For this purpose, a fluid coupling 21 is provided between the engine output shaft and the oil pump 6, as shown in FIG. The fluid coupling 21 causes a slipping phenomenon when the rotation speed of the engine output shaft exceeds a certain value, suppresses the maximum rotation speed of the oil pump 6 to a constant value, and
The transmission efficiency of rotational torque at low engine speeds is also good. As a result, the crossflow fan rotational speed relative to the engine rotational speed N _E is as shown by the solid line in Figure 8.
Nf is obtained. As is clear from the figure, the number of rotations of the cross flow fan 1 can be suppressed when the engine is running at high speeds, and the minimum necessary number of rotations of the cross flow fan 1 can be ensured when the engine is at low speeds. Furthermore, the seventh
The figure is substantially the same as the example shown in FIG. 3 with a fluid coupling 21, so the operation is the same as the example shown in FIG. 3, and its explanation will be omitted. Instead of the fluid coupling, a variable type hydraulic pump 6 in which the amount of oil discharged is not directly proportional to the engine speed may be used to obtain the same effect.

In order to more reliably ensure the rotational speed of the crossflow fan 1 when the engine rotational speed is low and the engine temperature is high, an electric motor that operates only in this state may be connected to the crossflow fan 1. In this case, by operating the electric motor, a larger amount of cooling air can be supplied to the engine. This level of electric motor operation does not adversely affect other electronic auxiliary equipment.
There is no need to increase the size of the battery or alternator.

Without providing an electric motor, the capacity of the oil motor can be configured so that the engine cooling water is at a high temperature and the crossflow fan can supply the cooling air required when the engine is idling.
Even in this case, the fluid coupling functions to prevent excessive air from being sent to the engine when the engine rotates at high speeds, so overcooling of the engine can be prevented.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an explanatory diagram showing an operating circuit, and FIG.
The figure is a side view showing another example, Fig. 5 is an explanatory diagram showing its operating circuit, Fig. 6 is a side view showing a state in which the shroud of the example shown in Fig. 5 is installed differently, and Fig. 7 is another example. A side view showing an example, and FIG. 8 are diagrams showing the relationship between the engine rotation speed and the cross flow fan rotation speed. In the diagram: 1...Cross flow fan, 2...Radiator, 4...Movable shroud, 5...Engine, 6...Oil pump, 7...Oil motor, 10, 16...Switching valve, 1
3, 14, 17...Sensor, 15...Radiator shutter.

Claims (1)

[Claims] 1. A radiator, a crossflow fan disposed in the shroud and close to the radiator, an oil motor that rotates the crossflow fan, an oil pump driven by the engine, and a connection between the oil motor and the oil pump and oil tank. A first switching valve arranged in a circuit, a first driving cylinder connected to the circuit and controlling the opening and closing of the radiator shutter, and a second driving cylinder connected to the circuit and controlling the opening and closing of the movable shroud. , the first drive cylinder is arranged in parallel with the oil motor and connected to the first drive cylinder, and the second drive cylinder is connected to a second switching valve parallel to the first switching valve. the operation of both switching valves is controlled by at least the engine water temperature;
An engine cooling system characterized by controlling opening and closing of a switching valve according to vehicle speed.