JPS61149623A - fluid coupling - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a fluid coupling for a cooling fan.

Conventionally, this type of fluid coupling was manufactured by Tokukosho! ;g-215/2
As exemplified in Japanese Patent Publication No. 5S-U-7/1987, a mounting member of a cooling fan is rotatably attached to a drive shaft rotated by an engine, and an operating chamber and a storage chamber are provided in the mounting member. The rotor accommodated in the working chamber is attached to the drive shaft, and a discharge passage for discharging the viscous fluid in the working chamber to the storage chamber and a supply passage for supplying the viscous fluid in the storage chamber to the working chamber are formed, and the temperature of the air passing through the fugiator is controlled. A valve mechanism is provided that closes the supply path when the temperature is lower than the set temperature.

When the temperature of the air passing through the fugiator is lower than the set temperature, the supply path is closed, and the torque transmitted from the rotor to the mounting member and the rotational speed of the mounting member are reduced, respectively, and the cooling Fan speed decreases. Also, on the contrary? When the temperature of the air passing through the radiator is higher than the set temperature, the supply path opens, the transmitted torque increases, and the fan rotation speed increases.However, since the fan rotation speed is controlled on and off according to the above, Fan speed control is rough.

This is far from the ideal situation where the fan speed increases and decreases according to the engine temperature. When the engine temperature is low, the fan rotation speed is not sufficiently reduced, resulting in large M force loss, and when the engine temperature is high, the fan rotation speed is not sufficiently increased.

High risk of overheating. .

The purpose of the present invention is to solve the problem of conventional products having more disadvantages than those mentioned above. This has been improved to allow for finer control of the rotation speed of the cooling fan.

The first invention is the rotation speed of the fan according to the rise and fall of the engine temperature? Due to increase or decrease, the engine temperature increases.

This fluid coupling is characterized by being provided with a transmission torque control mix that moves the rotor in the axial direction of the drive shaft as it descends to reduce or expand the distance between the torque transmission section on the rotor plate surface and the torque transmission section on the inside of the working chamber. .

A second invention Fi is a fluid coupling characterized in that, in addition to the above-mentioned transmission torque control mechanism, a valve mechanism is provided that throttles the supply path as the distance between the two torque transmission parts increases.

Next, one embodiment of the present invention will be described.

1st embodiment (see Fig. 1 and ①) In the fluid coupling of this example, as shown in Fig. 1, the drive shaft (1)
is connected to the shaft (3) of the engine cooling water pump (2). The cooling water pump (2) is connected to a ball bearing (6) by inserting the pump shaft (3) into a sleeve (5) connected to the base plate (4).
The nine casings (7) are mounted on the base (4).
) An impeller (8) is fitted to one end of the pump shaft (3) that protrudes into the inside. The pump shaft (
The other end of the drive shaft (1) is connected to the base end of the drive shaft (1), and the drive shaft (1
) is attached to the pulley (lυ) connected to the base end of the engine (1711υ), which is connected to the engine crankshaft via a thin belt (not shown).The drive N (1) Ka, which is rotated by the engine The disc-shaped mounting member opening of the engine cooling fan is rotatably and concentrically mounted via a ball bearing +13, and a disc-shaped working chamber Q4 and a disc-shaped storage chamber ( Lf9 is formed concentrically.The spline shaft portion QQ of the drive shaft protruding into the working chamber 04 has a spline shaft portion QQ of the drive shaft protruding into the working chamber 04.
The rotor αη is attached to the drive shaft (1) so that it can move only in the axial direction.The rotor αη is attached to the drive shaft (1) so that it can move only in the axial direction. Facing this, a labyrinth-type torque transmission section 09.(E) is formed on the inner surface of the nine working chamber 04.A first group and a third As shown in Fig. 2, the viscous fluid of silicone oil in the first working chamber 04 is discharged into the storage chamber OF9, and the viscous fluid in the storage chamber 09 is discharged into the working chamber 114.
It forms a supply path for supplying to 1. An engine cooling fan blade (not shown) is attached to the periphery of the mounting member (1).

An example of a bellows that expands and contracts in the direction of movement of the rotor αη is installed between the front end of the drive shaft (1) and the rotor αη center plate facing the rotor, as shown in Fig. 1 and No. It is installed. A gas chamber 4 is formed in the end of the pump shaft (3) where the impeller (8) is fitted, which is filled with a temperature detection gas such as Freon gas that expands and contracts as the temperature rises and falls. and the gas chamber (
A gas passage communicating with (b) is formed.

The end of gas passage ``6'' communicates with the bellows (c).

That is, as the temperature of the cooling water in the cooling water pump (2) rises and falls, the rotor (i) force is moved toward the base end and the distal end of the drive shaft (1), and the torque of the rotor's torque transmission part 09 and the mounting member is increased. A transmission torque control mechanism is provided to reduce or expand the transmission area.

In the fluid coupling of this example, when the drive shaft (1) rotates due to the drive of the engine, the rotor Uη rotates, and the viscous fluid that has entered between the torque transmitting portion 09 of the rotor and the torque transmitting portion of the mounting member. The rotational torque of the rotor αη is transmitted to the mounting member Ca, the mounting member t+3 rotates, and the engine cooling fan rotates.

On the other hand, the viscous fluid in the working chamber 1 (14) is discharged into the storage chamber 09 through the discharge path @ by the rotation of the rotor with zero force, and the viscous fluid in the storage chamber 0
The viscous fluid of 9 is supplied to the working chamber α through the supply path), and the pump shaft (3) is rotated by the rotation of the drive shaft (]), and the cooling water cylinder (2) is operated. As the temperature of the cooling water in the pump (2) rises, the amount of torque transmitting parts of the rotor's torque transmitting part 09 and the mounting member decreases, and the transmission area of both torque transmitting parts 09 increases or the area between the transmitting surface 1 increases. Due to the decrease, the transmitted torque increases, and the rotational speed of the mounting member (to), that is, the rotational speed of the engine cooling fan increases.

Conversely, as the cooling water temperature decreases.

The distance between both torque transmitting parts UC and (to) is enlarged, and the transmitted torque is decreased due to a decrease in the transmission area or an increase in the transmission surface clearance, and the number of recesses fA of the engine cooling fan is decreased.

No. 5j! Embodiment (See Figures 3 and 8gt) The fluid coupling of this embodiment is the same as that of the previous example, but a valve mechanism for throttling the supply path is added. The valve mechanism is as shown in Figure 3 and Figure ≠.
A circular plate-shaped valve plate on the rotor 0η? It is provided facing the 1jfi port of supply path 4.

Therefore, as the distance between the two torque transmitting parts (1g, (E)) increases, the valve plate approaches the opening of the supply passage (2), and the supply passage is narrowed. The amount of viscous fluid supplied to is reduced.

In the fluid coupling of this example, as the temperature of the cooling water in the cooling water pump (2) decreases, the distance between the two torque transmitting parts aS and W increases as in the previous example.

As the transmission area decreases or the transmission surface clearance increases, the transmitted torque decreases, and as the distance between the two torque transmitting parts increases, the supply entanglement is narrowed down by the valve plate.

The amount of viscous fluid supplied to the working chamber 04 decreases, and the amount of viscous fluid that enters between the two torque transmitting parts 4 and (a) decreases, reducing the transmission torque and increasing the rotation of the engine cooling fan. The number decreases sufficiently.

Conversely, as the cooling water temperature increases by 1 degree.

As in the previous example, both torque transmission parts nl and 4 are reduced, and the transmitted torque increases due to an increase in the transmission area or a decrease in the transmission surface clearance, while both torque transmission parts nl,
As the gap between α9 and Ca) is reduced, the valve plate moves away from the opening of the supply path (A), and the amount of viscous fluid supplied to the actuation fi 1141 increases, causing both torque transmission parts α9. The amount of viscous fluid that enters the gap increases, the transmitted torque increases, and the rotational speed of the engine cooling fan increases sufficiently.

Note that the same parts as in the previous example are given the same reference numerals in FIG. 3 and FIG. ψ.

Third Embodiment (See Figures 5 and 6) The fluid coupling of this example is a partial modification of the previous example. The positions of the working chamber a4 and the head of the storage chamber in the mounting member (6) are swapped back and forth, and the torque transmitting parts (19, (4) on the inner surface of the working chamber side facing the peripheral panel of the rotor 07) are connected to the rotor ([ Move the cylindrical 60-z (c) to the front side of the rotor qη between the cup-shaped mounting #t (to) attached to the inner panel surface of the rotor qη and the tip of the drive shaft (1). The opening of the supply path (2) faces the board of the loader 0η.Other points are the same as in the previous example, so see Figure 5 and @4!21. The same reference numerals are used to omit the explanation.

In the fluid coupling of this example, the direction in which the rotor (171) moves as the cooling water temperature rises and falls is opposite to that in the previous example. A rotor surface is used instead of a valve plate.

@μ Example (see Figures 7 and g) The fluid coupling of this example is one in which part of the transmission torque control mechanism of the example @ has been changed. Change the gas chamber in the fitting end of the pump shaft (310 impeller (8) to the cylinder chamber (to), and change the gas passage at the axis position of the pump shaft (3) and drive shaft (1) to the rod hole axis. Is there a piston in the cylinder chamber?
Slide it into the pinuton rod ■P and insert it into the rod hole (a), and fix the rod (d) protruding from the tip of the drive@(1) to the attachment part (support) of the rotor α force instead of a bellows. ,
A threaded spring Gη that presses the piston 4 is fitted into the chamber on the rod ■ side of the cylinder chamber (to), and a bimetal-like spring Gη that expands and contracts as the temperature rises and falls is inserted into the chamber on the opposite side of the cylinder chamber 4.
A cooling water inlet/outlet (2) is provided in the chamber in which the blackness detection coil is fitted into the fourth cylinder chamber and the temperature detection coil (toward) in the fourth cylinder chamber is fitted. Other points.

Since it is the same as in the previous example, the same reference numerals are given to FIG.

In the fluid coupling of this example, Fi is an increase in cooling water temperature.

As it descends, piston 4 slides to the p rad ■ side, and each time it slides to the opposite side, loft... and installation S! (to) rotor αη through
moves in the axial direction of the drive shaft (1), and the distance between the torque transmitting member a9 on the rotor plate surface and the torque transmitting member on the inner surface of the working chamber is reduced.
Expanding.

Other Examples (Refer to the second cause) The fluid coupling of this example has a fubilinth-type torque transmission part Qg formed on the plate surface of the rotor nη and the inner surface of the working chamber Q4, as shown in FIG. The cross-sectional shape of the groove is triangular instead of rectangular.

In this torque transmission section 01, (1), the rotor α
In each of the above embodiments, in which the amount of change in the transmitted torque with respect to the axial movement of η is small and the adjustment of the attachment device for the rotor αη is easy, the temperature of the engine cooling water is used as the engine temperature. However, the temperature of the engine oil may also be used.

Effects of the Invention In the first invention, as the engine temperature rises, the space between the two torque transmission parts decreases, and the transmission torque increases due to an increase in the torque transmission area or a decrease in the torque transmission surface clearance. The rotation speed of the fan mounting member increases, and
As the engine temperature decreases, the distance between the two torque transmitting parts increases, the torque transmitting area decreases or the torque transmitting surface gap increases, so the transmitted torque decreases, and the rotational speed of the cooling fan mounting member decreases.

Therefore, the rotation speed of the cooling fan increases as the engine temperature increases and decreases by 7X1. compared to conventional products that are controlled on and off.

In the second invention, as the engine temperature decreases, the distance between the two torque transmitting parts increases, and the transmitted torque decreases due to a decrease in the torque transmitting area or an increase in the torque transmitting surface clearance. As the viscous fluid expands, the supply path is narrowed and the amount of viscous fluid supplied to the working chamber decreases.
The amount of viscous fluid that enters between the two torque transmitting parts is reduced, the transmitted torque is reduced, and the rotational speed of the mounting member of the cooling fan is sufficiently reduced. In addition, as the engine temperature rises, the space between both torque transmitting parts decreases, and the transmitted torque increases due to an increase in the torque transmitting area or a decrease in the torque transmitting surface clearance, and as the distance between the two torque transmitting parts decreases, one working chamber decreases. The amount of viscous fluid supplied to the cooling fan increases, the amount of viscous fluid that enters between the two torque transmitting parts increases, the transmitted torque increases, and the rotational speed of the cooling fan mounting member increases sufficiently.

Therefore, the rotation speed of the cooling fan is controlled by increasing or decreasing the area of the torque transmitting part or the gap between the holes and the amount of viscous fluid. S-1! is closely controlled.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional side view of a fluid coupling according to an embodiment of the present invention, and Fig. 2 is a sectional view taken along the line 1-1 of the first view. Figure 3 is a vertical side view of the fluid coupling of the second embodiment, and Figure 1 is a cross section taken along line ff-IV in Figure 3. FIG. 5 is a vertical sectional side view of the fluid coupling of the third projecting embodiment, and FIG. 6 is a side view of the ■-vts of the fifth □□□. FIG. 7 is a vertical sectional side view of the fluid coupling of the second embodiment, and M is a sectional view taken along the line ■-■ in FIG. 7. This is a side view of the longitudinal section of the example fluid coupling.

Claims (2)

[Claims] (1) A cooling fan mounting member is rotatably attached to the drive shaft rotated by the engine, a working chamber containing viscous fluid is provided in the mounting member, and a plate-shaped rotor housed in the working chamber is attached to the drive shaft. It is mounted so that it can move only in the axial direction, and a torque transmission part is formed on the rotor plate that rotates with the rotation of the drive shaft and the inner surface of the working chamber facing it, and the rotor changes as the engine temperature rises and falls. Moves in the axial direction to reduce the distance between the torque transmission part on the rotor plate surface and the torque transmission part on the inside of the working chamber.
A fluid coupling characterized by being provided with an expanding transmission torque control mechanism. (2) A cooling fan mounting member is rotatably attached to the drive shaft rotated by the engine, an operating chamber and a storage chamber are provided in the mounting member, and a plate-shaped rotor housed in the operating chamber is attached to the drive shaft. A rotor that is mounted so as to be movable only in the core direction and forms a discharge passage for discharging viscous fluid from the working chamber into the storage chamber and a supply passage for supplying the viscous fluid from the storage chamber to the working chamber, and is rotated by the rotation of the drive shaft. A torque transmission section is formed on the surface of the rotor panel and the inner surface of the working chamber facing it, and as the engine temperature rises and falls, the rotor moves in the axial direction to transmit torque between the torque transmission section on the rotor disk surface and the inner surface of the working chamber. 1. A fluid coupling characterized by being provided with a transmission torque control mechanism that reduces and expands the distance between the two torque transmitting portions, and a valve mechanism that throttles the supply path as the distance between the two torque transmitting portions increases.