JPS606600Y2 - Fluid coupling device for engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid coupling device for an engine cooling system, and more particularly to a fluid coupling device incorporated between a drive source, a cooling fan, and a cooling water pump.

Due to the recent challenges faced by automobile engines, such as energy resource conservation, noise regulations, and exhaust gas regulations, there is an increasing need for engine cooling to reduce horsepower loss, reduce noise, and improve warm-up characteristics. In particular, there is a strong demand for improved fuel efficiency in conjunction with exhaust gas countermeasures, and the development of motorization has expanded the range of driving conditions for automobiles, so optimal cooling of the engine under all conditions has become a necessity. There is a growing need for high performance and reliability.

Due to these demands and needs, in recent years, fluid coupling devices for cooling fans (fan coupling devices) have been developed that limit the maximum rotation speed of cooling fans to a certain predetermined value and prevent the cooling fans from rotating excessively. It was developed and is currently used in many automobiles.

By the way, the drive shaft of a cooling water pump has conventionally been generally driven by a drive source,
That is, it is directly connected to the engine crankshaft, so the rotation speed of the cooling water pump always increases in proportion to the engine rotation speed.

The cooling water pump needs to be driven at a relatively low speed to avoid uneven temperature of the cooling water in the engine water jacket even when the engine is cold. When the engine is cold, there is no need to drive it at high speed.

When the coolant pump is driven at high speed when the engine is cold, cold coolant circulates vigorously within the water jacket, slowing engine warm-up, and some of the coolant flows through the narrow bypass passage, causing the pump to run at high speed. This causes a problem of increased torque loss.

The purpose of this invention is to provide a fluid coupling device for an engine cooling system that can reduce horsepower loss and improve warm-up characteristics by controlling the rotation speed of the cooling fan and the rotation speed of the cooling water pump. .

This object, according to the present invention, includes an ink mediet housing and second and second side housings attached to both sides of the ink mediet housing. a housing assembly that cooperates with each of the housings to define the first and second chambers and provide a driving force; and a cooling water pump drive shaft rotatably supported by the first side housing. a first rotor located in the first chamber and carried by the cooling water pump drive shaft and cooperating with the housing assembly to form a fluid coupling therebetween; and a first rotor rotatable to the second side housing. a supported cooling water fan drive shaft; and a second rotor within the second chamber carried by the cooling water fan drive shaft and cooperating with the housing assembly to define a fluid coupling therebetween. It is distantly related to the fluid coupling device for engine cooling system.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The accompanying drawing is a longitudinal sectional view showing one embodiment of the fluid coupling device for an engine cooling system according to the present invention.

In the figure, reference numeral 1 indicates a pump body attached to an engine body (not shown).

A cover 3 is attached to the front part of the pump body 1 by bolts 2.

The cover 3 rotatably supports the hub portion 7 of the housing assembly 6 by means of two ball bearings 4 and 5.

The housing assembly 6 includes a disc-shaped ink me diet housing 8, and first and second side housings 1 attached to both sides of the housing by bolts 9 and nuts 10.
1.12, and the first side housing 11 has the hub portion 7 as a part thereof.

The intermediate diet housing 8 has a V on its outer periphery.
The belt 13 constitutes a belt pulley 14 on which the rack is passed.

The first side housing 11 has a ball bearing 1
5 rotatably supports the cooling water pump drive shaft 16.

This drive shaft 16 projects into the pump body 1 at one end and carries a pump impeller 17 at its end.

The other end of the drive shaft 16 is connected to the ink me diet housing 8 and the first side housing 11.
It projects into a first chamber 18 defined by and carries a first rotor 19 at its end.

The ink me diet housing 8 and the first rotor 19 each have a plurality of annular protrusions 2G and 21 centered on the cooling water pump drive shaft 16 on their opposing surfaces. The annular ridges 20, 21 are interlocked as shown to define a labyrinth-like small gap fluid passage 22 therebetween.

A viscous fluid such as silicone oil is sealed in the first chamber 18, and the presence of this viscous fluid in the fluid passage 22 causes the rotational force of the ink me diet housing 8 to increase due to the viscosity of the viscous fluid. The shearing force is transmitted to the first rotor 19.

Further, a viscous fluid return passage 23 is formed in the first side housing 11, and a return passage 23 for the viscous fluid is formed in the first side housing 11.
9 is provided with a through hole 24.

The second side housing 12 has a ball bearing 2
5 rotatably supports the cooling fan drive shaft 26.

The cooling fan drive shaft 26 and the cooling water pump drive shaft 1
6 and are provided on the same axis.

The cooling fan drive shaft 26 protrudes outside the second side housing 12 at one end, and supports a cooling fan 27 at its tip.

The other end of the cooling fan drive shaft 26 is connected to a second chamber 2 of a sealed structure defined by the ink me diet housing 8 and the second side housing 12 together.
8 and carries a second rotor 29 at its end.

The ink me diet housing 8 and the second rotor 29 each have the cooling fan drive shaft 2 on their opposing surfaces.
It has a plurality of annular protrusions 30, 31 centered at 6, which interlock with each other to define a labyrinth-like small gap fluid passage 32 therebetween.

A viscous fluid such as silicone oil is sealed in the second chamber 28, and the presence of this viscous fluid in the fluid passage 32 causes the rotational force of the ink me diet housing 8 to increase due to the viscosity of the viscous fluid. The shearing force is transmitted to the second rotor 29.

Further, the second side housing 12 is provided with a viscous fluid return passage 33, and the second side housing 12 is provided with a return passage 33 for the viscous fluid.
9 is provided with a through hole 34.

According to the configuration described above, the rotational force applied to the intermediate diet housing 8 is transmitted to the first rotor 19 by the viscous shearing force of the viscous fluid existing in the fluid passage 22, which drives the cooling water pump. It is transmitted to the shaft 16 and drives the pump impeller 17.

Further, the rotational force applied to the ink me diet housing 8 is transmitted to the second rotor 29 by the viscous shear force of the viscous fluid existing in the fluid passage 32, and from there to the cooling fan drive shaft 26. , drives the cooling fan 27.

When the rotational speed of the ink me diet housing 8 increases, the rotation speed between the ink me diet housing 8 and the first rotor 19 and between the ink me diet housing 8 and the second rotor 29 increases accordingly. The amount of each slip increases, and the intermediate diet housing 8
When the rotation speed reaches a certain predetermined value, even if the rotation speed of the ink me diet housing 8 increases further, the rotation speed of the cooling water pump drive shaft 16 and the cooling fan drive shaft 26 will rise above the predetermined value. Never.

Note that the maximum rotation speed of the cooling water pump drive shaft 16 and the maximum rotation speed of the cooling fan drive shaft 26 may have different values, and the maximum rotation speed depends on the viscosity of the viscous fluid and the width of the fluid passage. Determined by characteristics.

If necessary, a valve device may be incorporated into the housing assembly 6 to control the amount of viscous fluid present in the fluid passage depending on the temperature, etc. The maximum rotation speed of the cooling fan drive shaft may be variably controlled.

In the above, the present invention has been described in detail with respect to specific embodiments, but it will be appreciated by those skilled in the art that the present invention is not limited to this and that various embodiments are possible within the scope of the present invention. It should be obvious.

[Brief explanation of drawings]

The attached figure is a cross-sectional view showing one embodiment of a fluid coupling device for an engine cooling system according to the present invention. 1... Pump body, 2... Bolt,
3...Cover, 4.5...Ball bearing, 6...Housing assembly, 7...
・・Hub part, 8・Intermediate diet housing, 9・・Bolt, 110・・Nut,
11...First side housing, 12...
...Second side housing, 13...■ Belt, 14...Belt L15...Ball bearing, 16...Cooling water pump drive shaft,
17. Curved pump impeller, 18... First chamber, 19... Second rotor, 20, 21... Annular protrusion, 22... Fluid. Aisle, 23...
・Return passage, 24...Through hole, 25...
・Ball bearing, 26... Cooling fan drive shaft, 27... Cooling fan, 28... Second chamber, 29... Second rotor, 30,31・
...... Annular protrusion, 32 ...... Fluid passage, 3
3...Return passage, 34...Through hole.

Claims (1)

[Scope of utility model registration request] The housing includes an intermediate diet housing and second and second side housings attached to both sides of the intermediate diet housing. a housing assembly that defines a second chamber and is provided with a driving force; a cooling water pump drive shaft rotatably supported by the first side housing; a first rotor carried by the pump drive shaft and cooperating with the housing assembly to form a fluid coupling therebetween; a cooling water fan drive shaft rotatably supported by the second side housing; and a second rotor disposed in a second chamber, carried by the cooling water fan drive shaft, and cooperating with the housing assembly to form a fluid coupling therebetween. Fluid coupling device.