KR19980028802A - High Speed Direct Connection Device of Fan Clutch - Google Patents

Abstract

The present invention relates to a high speed direct coupling device of a fan clutch, wherein one end portion of the bimetal (4) is fixedly mounted to a bearing case (3) in which a rotating fan (2) is mounted on an outer circumference thereof while the driving shaft (1) is fitted. The front end portion is attached to a slide valve 5 having an oil supply hole 5a, and inside the bearing case 3, an oil supply line 6a and an oil return line, which are opened and closed by the slide valve 5, 6b) has a built-in oil tank (6), when the engine is running at high speed is connected directly to the fan clutch and the drive shaft integrally by the maximum rotation speed of the fan to blow the air to the radiator to the maximum There is an effect of improving the cooling performance of the engine.

Description

High Speed Direct Connection Device of Fan Clutch

1 is a schematic cross-sectional view of a fan clutch according to the prior art, and FIG. 2 is a schematic cross-sectional view of a fan clutch equipped with a high speed direct coupling device according to the present invention.

Explanation of symbols for the main parts of the drawings

1-drive shaft 2-rotating fan

3-bearing case 4-bimetal

5-slide valve 5a-oil supply hole

6-Oil Tank 6a-Oil Supply Line

6b oil return line 7-turn plate

8-weight 9-valve

10-spring

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan clutch used to cool an engine of a vehicle. In particular, the present invention relates to a fan clutch that is capable of increasing a rotational speed of a fan at a high speed to improve the cooling efficiency of the engine when the engine is rotated at a high speed. It relates to a high speed direct connection device.

In general, in an automobile equipped with an internal combustion engine, as the engine operates, heat generated from the combustion gas is conducted to the cylinder head, the piston, the valve, and the like. When the temperature of these components becomes excessively high, the material strength of the components increases. The lowering causes a failure or shortens the lifespan, and the combustion condition worsens, leading to knocking and premature ignition, resulting in lower engine power.

In addition, if the cooling is incomplete, the lubrication function such as the oil film on the cylinder wall is broken, and the lubrication function is degraded, the oil is deteriorated and abnormal wear is caused, and the piston is pressed against the cylinder wall. .

In order to solve these problems, the internal combustion engine must be equipped with a cooling means. In the case of a small engine such as a motorcycle engine, air cooling is sufficient, but most engines used for automobiles use water cooling.

The water-cooled cooling device is to circulate the cooling water in the water jacket provided in the cylinder block and the cylinder head to perform a cooling action, and is composed of a radiator, a water pump cooling fan, and a water temperature regulator.

Here, the cooling fan is usually integrated with the pump shaft and attached to the rear of the radiator while being rotated to obtain sufficient cooling effect of the radiator, and also serves to prevent overheating of the exhaust manifold at high speed.

Such a cooling fan automatically adjusts the rotation of the fan to reduce the loss of power consumed to drive the fan as much as possible, and to reduce the engine overcooling or fan noise, there is a fan clutch called an automatic fan It is commonly used.

The fan clutch is a fluid coupling in which silicone oil is enclosed between the fan and the water pimp. The power transmission is a fluid coupling type using the fluid resistance of the oil and senses the temperature of the air passing through the radiator. There is a fan clutch type that automatically shifts the speed of rotation.

1 shows the conventional fan clutch type structure as described above, that is, one end portion of the bimetal 4 is attached to a bearing case 3 in which the rotating fan 2 is mounted on the outer circumference thereof while the driving shaft 1 is fitted. In addition to being fixedly mounted, the other end portion is attached to the slide valve 5 having the oil supply hole 5a, and the oil supply line 6a opened and closed by the slide valve 5 inside the bearing case 3. ) And an oil tank 6 having an oil return line 6b.

Accordingly, when the temperature of the engine rises and the temperature of the air passing through the radiator increases, the oil supply hole 5a of the slide valve 5 is rotated by a predetermined angle due to the deformation of the bimetal 4. Through the oil of the oil tank 6 is introduced into the oil supply line (6a), the starting torque of the fan clutch is increased by the oil introduced in this way to increase the rotational speed of the fan.

On the other hand, when the temperature of the air passing through the radiator decreases, the bimetal contracts and the inlet of the oil supply line is closed. At this time, the already supplied oil is returned to the oil tank 6 through the oil return line, and the rotation speed of the fan is low. You lose.

That is, the viscosity of the oil acts according to the correlation between the oil inflow amount flowing through the oil return line and the return amount returned through the oil return line 6b to change the rotation speed of the fan clutch according to the rotation speed of the drive shaft 1. It is supposed to be.

However, in the conventional fan clutch having the above-described structure, the maximum rotation speed is determined by the residual amount and viscosity of the oil according to the difference between the oil supply amount and the recovery amount, and thus the maximum rotation speed of the fan clutch is determined by the driving shaft 1. It is fixed at a rotational speed smaller than the rotational speed of the motor. This causes a severe drawback of the fact that it is difficult to effectively cool the engine as the heat load is greatly increased when the engine operating conditions are severe.

Accordingly, the present invention has been made to solve the above-described drawbacks, and the fan clutch is directly connected to the drive shaft so that the fan is rotated at a rotational speed substantially equal to the rotational speed of the drive shaft when the engine is driven at a high speed, thereby improving cooling performance. Its purpose is to provide a high speed direct connection device.

The present invention for achieving the above object, the one end of the bimetal is fixed to the bearing case in which the rotating fan is mounted on the outer periphery while the drive shaft is fitted, while the other end is attached to the slide valve having the oil supply hole And a fan clutch having a structure in which an oil tank having an oil supply line and an oil return line opened and closed by the slide valve is built in the bearing case, and proportionally to the centrifugal force applied to the oil return line. The centrifugal valve means for gradually closing the flow path of the oil return line is mounted.

Accordingly, when the operating speed of the engine is gradually increased and the rotation speed of the fan of the rotating fan clutch is correspondingly increased, the flow path of the oil return line is gradually narrowed by the centrifugal valve means, and the operating speed of the engine continues to increase. When the flow path of the oil return line is completely closed by the centrifugal valve means, as the fan clutch is directly connected to the drive shaft, the fan is rotated almost at the rotational speed of the drive shaft, thereby improving the cooling performance during the high speed operation of the engine.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic cross-sectional view of a fan clutch equipped with a high speed coupling device according to the present invention, that is, a bimetal 4 in a bearing case 3 in which a rotating fan 2 is mounted on an outer circumference thereof while the driving shaft 1 is fitted. The one end of the is fixedly mounted, the other end is attached to the slide valve (5) having an oil supply hole (5a), the oil is opened and closed by the slide valve (5) inside the bearing case (3) An oil tank 6 having a supply line 6a and an oil return line 6b is incorporated.

The oil return line 6b is equipped with a centrifugal valve means for gradually closing the oil return line in proportion to the centrifugal force applied thereto.

That is, one end portion of the rotating plate 7 is attached to the oil return line 6b, and a weight 8 is attached to the other end portion of the rotating plate 7 and the inside of the oil return line 6b. The protruding valve 9 is configured to be elastically supported through the spring 10.

Accordingly, when the engine is driven and the drive shaft 1 is rotated, the fan of the fan clutch is rotated by the action of the bimetal sensing the temperature of the air through the radiator, and the drive shaft 1 is gradually increased while the engine speed is gradually increased. If the rotational speed of the correspondingly increased, the amount of oil flowing through the oil supply line (6a) gradually increases, so that the rotational speed of the fan is increased. As the size of the centrifugal force acting on the valve means increases, the flow path of the oil return line is gradually blocked through the valve 9, so that the rotation speed of the fan becomes higher.

When the engine is operated at a high speed, the centrifugal force acting on the centrifugal valve means also increases, and thus, the valve 9 completely blocks the flow path of the oil return line, so that the driving shaft 1 and the fan clutch are integrally connected in the end. Accordingly, the fan is rotated at about the same speed as the drive shaft to blow air into the radiator, thereby improving the cooling performance of the engine.

As described above, according to the high speed direct coupling device of the fan clutch according to the present invention, when the engine is driven at a high speed, the drive shaft and the fan clutch, which are rotated by receiving the power of the engine, are directly connected together by a centrifugal valve to increase the rotation speed of the fan. Since the air is blown to the maximum while increasing maximum, there is an effect of improving the cooling performance at high speed of the engine.

Claims (2)

As the drive shaft 1 is fitted, one end of the bimetal 4 is fixed to the bearing case 3 in which the rotating fan 2 is mounted on the outer periphery, while the other end has a slide valve having an oil supply hole 5a. Attached to (5), the oil tank (6) having an oil supply line (6a) and the oil return line (6b) that is opened and closed by the slide valve (5) inside the bearing case (3) In the fan clutch having a structure, the oil return line 6b is provided with a high speed direct connection device of the fan clutch, characterized in that a centrifugal valve means for gradually closing the flow path of the oil return line is proportional to the centrifugal force applied thereto. . 2. The rotating plate (7) according to claim 1, wherein said centrifugal valve means is attached to one end of said oil return line (6b), a weight (8) attached to the other end of said rotating plate (7), Protruding into the oil return line (6b) of the fan clutch characterized in that it has a structure having a valve (9) installed to be elastically supported through the spring (10) to open and close the oil return line (6b) High speed direct connection device.