JPH0331862Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fluid coupling fan device that uses oil as a transmission medium to drive the fan only at high temperatures.

(Prior Art) For example, in a cooling fan device for an automobile engine, a fluid coupling fan device is provided between a drive shaft from the engine and a cooling fan of a radiator.

This device has a working chamber and an oil storage chamber that stores oil for the working chamber formed inside a case equipped with a fan, and connects the working chamber and the oil storage chamber to a bypass passage that is opened and closed by the operation of a bimetal. and an oil communication passage to fluidly connect the disk plate disposed within the working chamber and driven by the drive shaft to the case.

As a result, when the temperature is low, the bypass passage is closed by the action of the bimetal, so oil escapes from the working chamber via the oil communication passage to the oil storage chamber by the centrifugal force of the disc plate, and in this way the oil in the working chamber is As a result, the transmission force from the drive shaft to the case (fan) is lost.

On the other hand, when the temperature is high, the oil in the oil storage chamber returns to the working chamber through the bypass passage opened by the bimetal, and the returned oil generates a force transmitted from the drive shaft to the case (fan).

In this way, by cutting off the transmission at low temperatures, overcooling is prevented.

However, in the above-mentioned fluid coupling fan device, the disc plate rotates as the engine is driven, and the centrifugal force is used to release the oil in the working chamber to the oil storage chamber. There was sufficient oil in the cabin for transmission, which caused problems such as the fan being temporarily dragged around when the engine was started at a cold temperature, causing noise, a delay in warm-up, and loss of power.

In view of this, a fluid coupling fan device for the purpose of preventing the oil in the oil storage chamber from flowing back into the working chamber through the oil communication path is disclosed, for example, in Japanese Utility Model Application Publication No. 59-116637. There is.

This device has a check valve in the oil communication hole to prevent the oil in the oil storage chamber from flowing back into the working chamber, thereby preventing the fan from spinning when the engine is started.

However, since the check valve is always biased in the valve closing direction, when the fan is decelerated during operation, the oil in the working chamber becomes a resistance as it is sent into the storage chamber, which increases the time required for the fan to rotate. This causes another problem of increased power loss and noise.

Furthermore, in Japanese Patent Application Laid-Open No. 59-34030, a check ball valve is provided in the oil communication passage with an on-off valve that is biased by a spring, and the oil communication is controlled by the magnitude relationship between the centrifugal force caused by rotation and the biasing force of the spring. A device in which the passage can be opened and closed has been proposed, but this device cannot be opened half-open or closed due to the relationship between centrifugal force and spring force.
If a half-closed condition occurs and the spring force is set so that it opens fully at the set rotation speed, the check ball valve will start opening at a rotation speed slightly before the set rotation speed, and oil will gradually leak in areas where it should not leak. On the other hand, if the spring force was set so that the check ball valve would start to open from the set rotation speed, there was a problem that the oil flow rate would be insufficient until it reached the fully open state.

(Purpose of the invention) This invention was made in view of the above problems.
In particular, the purpose is to shorten the time for the fan to spin when the fan is decelerated during operation, thereby effectively reducing noise and power loss due to unnecessary rotation of the fan.

(Structure of the invention) Therefore, the present invention forms a working chamber and an oil storage chamber for storing oil in the working chamber inside a case equipped with a fan, and also connects the working chamber and the oil storage chamber to a bimetallic material. A fluid coupling fan for an engine, which communicates with each other through a bypass passage and an oil communication passage that open and close according to the operation of the engine, and fluidly connects the case with a disk plate arranged in the working chamber and driven by the drive shaft. In the device, a ring-shaped valve seat made of a permanent magnet is interposed in the oil communication path, and
A ball valve made of a magnetic material with the ring-shaped valve seat as a valve seat is disposed outside the ring-shaped valve seat when viewed in the radial direction of the case, and the rotation speed of the case is low when the rotation speed does not reach the set rotation speed. Sometimes, the ball valve is adsorbed to the ring-shaped valve seat to close the oil communication passage.
To provide a fluid coupling fan device characterized in that when the rotational speed exceeds a set rotation speed, the centrifugal force acting on the ball valve overcomes the adsorption force of the ring-shaped valve seat and opens the oil passage. .

(Effects of the invention) According to the invention, when the engine is stopped, the oil communication passage is closed by the valve device that is biased in the valve closing direction by the biasing means, so the oil in the oil storage chamber does not flow back into the working chamber. This prevents the fan from spinning when starting the engine, reducing power loss and noise. On the other hand, when the fan decelerates during engine operation, the valve device is opened by the centrifugal force generated by the rotation of the case. Since the valve device does not act as a resistance when the oil in the working chamber is sent into the storage chamber, the time required for the fan to rotate is shortened, and power loss and noise can be reduced.

In addition, with this invention, opening and closing are performed completely on and off depending on the relationship between the adsorption force of the ring-shaped valve seat and centrifugal force, so it is fully closed until the set rotation speed is reached, and when the set rotation speed is reached. The ball valve opens and closes as if it is fully opened, and there is no oil leakage or oil shortage before or after the set rotation speed, unlike in the case of a conventional spring.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show an example in which a fluid coupling fan device is applied to a cooling fan device for an automobile engine, in which 1 is a drive shaft connected to a shaft taken out from an engine (not shown).

A bearing 2 is attached to the outer periphery of the drive shaft 1.
A case 4 having a fan 3 on the outer periphery of this bearing 2
The case 4 is rotatably supported with respect to the drive shaft 1.

The case 4 is equipped with a separate plate 5 that partitions the internal space into front and rear parts, and this separate plate 5 forms an operating chamber 6 at the rear and an oil storage chamber 7 at the front. The working chamber 6 and the oil storage chamber 7 communicate with each other through a bypass passage 8 formed in the separate plate 5, and also through an oil communication passage 9 formed in the case 4.

Here, a drive shaft 1 is provided in the working chamber 6.
A disk plate 10 press-fitted into the front end of the oil storage chamber 7 is rotatably disposed, while a bypass passage is formed in the oil storage chamber 7 at a location corresponding to the front surface of the separate plate 5 by means of a bimetal 11 and a pin 12. An opening/closing leaf spring 13 is attached that can open and close 8.

The opening/closing leaf spring 13 uses the bimetal 11 to close the bypass passage 8 when the air from the radiator from the front is at a low temperature, and opens the bypass passage 8 when the air is at a high temperature.

Note that 14 is a heat radiation fin arranged around the outer periphery of the case 4, and 15 is a support frame for the bimetal 11.

On the other hand, as shown in detail in FIG. 3, the oil communication passage 9 is composed of a horizontal passage part 9a leading to the working chamber 6 and a vertical passage part 9b leading to the oil storage chamber 7, and is closed by a plug 17. Vertical passage section 9b
A ball valve 18 made of a magnetic material is loosely fitted into the corner portion with the horizontal passage part 9a, and a valve seat ring 1 made of a permanent magnet is fitted on the upstream side of the vertical passage part 9b.
9 is fitted, and when the case 4 stops rotating, the ball valve 18 closes by adhering to the valve seat ring 19 due to suction force (see the two-dot chain line in FIG. 3), and opens the oil communication path 9. At the same time, when the case 4 rotates, the valve separates from the valve seat ring 19 due to centrifugal force and opens (see the solid line in FIG. 3), opening the oil communication passage 9.

With the above configuration, when the engine is stopped, the ball valve 18 closes tightly against the valve seat ring 19 due to adsorption force, and the oil communication passage 9 is closed, so that the oil in the oil storage chamber 7 is activated. Since the flow does not flow back into the chamber 6, the fan 3 (case 4) is prevented from spinning when the engine is started.

On the other hand, during engine operation, the ball valve 18 separates from the valve seat ring 19 and opens due to the centrifugal force accompanying the rotation of the case 4, and the oil communication passage 9 is opened. , ball valve 1
8 does not act as a resistance when the oil in the working chamber 6 is sent into the oil storage chamber 7, so the fan 3
(Case 4) The running time is shortened.

Therefore, power loss and noise due to unnecessary rotation of the fan 3 (case 4) can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a fluid coupling fan device showing an embodiment of the present invention, FIG. 2 is a front sectional view taken along the line--FIG. 1, and FIG. 3 is an enlarged sectional view of the valve device. 1... Drive shaft, 3... Fan, 4... Case, 6... Working chamber, 7... Oil storage chamber, 8... Bypass passage, 9
...Oil communication path, 10...Disc plate, 11
...Bimetal, 18...Ball valve, 19...Valve seat ring.

Claims (1)

[Scope of Claim for Utility Model Registration] A working chamber and an oil storage chamber for storing oil to the working chamber are formed inside a case equipped with a fan, and the working chamber and the oil storage chamber are
A fluid coupling for an engine, which communicates with a bypass passage and an oil communication passage that are opened and closed by the operation of a bimetal, and fluidly connects the case with a disc plate that is disposed in the working chamber and is driven by a drive shaft. In the fan device, a ring-shaped valve seat made of a permanent magnet is interposed in the oil communication passage, and a ball valve made of a magnetic material with the ring-shaped valve seat as a valve seat is disposed in the oil communication path. arranged on the outside of the shaped valve seat,
When the rotation speed of the case is low and does not reach the set rotation speed, the ball valve is attracted to the ring-shaped valve seat and the oil communication passage is closed, and when the rotation speed is higher than the set rotation speed, the centrifugal force acting on the ball valve is A fluid coupling fan device characterized in that the oil passage is opened by overcoming the suction force of the shaped valve seat.