JPS5894639A - Temperature sensitive type viscous fluid coupling - Google Patents

Abstract

PURPOSE:To improve the sealing property of the reserving chamber and the operating chamber of the viscous fluid coupling and shorten the warm-up of an engine by a method wherein a temperature sensitive disc valve and a piston valve are arranged between the reserving chamber and the operating chamber of the viscous fluid coupling. CONSTITUTION:A case 3 and a cover 4 are provided around a driving shaft 1 so as to be movable freely. A rotor 6, integral with the driving shaft 1, keeps a small clearance between the cover 4 and the case 3. The disc valve 16 and the piston valve 31 are arranged between the operating chamber 11, accommodating the rotor 6 therein, and the reserving chamber 12. Upon the beginning of starting, the amount of oil in the operating chamber 11 is little, therefore, the number of revolutions of a partitioning plate 10, which is a driven shaft, is smaller compared with the same of the driving shaft 1. When the piston valve 31 is opened due to a centrifugal force and then the disc valve 16 is opened by sensing the temperature of a radiator, the oil circulates from the reserving chamber 12 to a hole 10d, the operating chamber 11, the hole 10e and the hole 10f and thereby increasing the number of revolutions of the partitioning plate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a viscous fluid coupling that is mainly installed automatically and controls the rotational speed of a cooling fan in response to the water temperature of a fugiator.

With conventional fluid couplings of this type, when the ignition switch inside the vehicle is turned off and engine rotation is stopped, 1
There is a large amount of viscous fluid remaining in the operating chamber, and this causes the engine to not warm up properly when starting in the morning, and it takes a long time to warm up, and it also takes time to heat up the passenger compartment. Ta.

Further, the conventional device in which the viscous fluid is communicated from the storage chamber to the working chamber and vice versa by swinging a plate valve has a drawback in that the sealing performance is incomplete.

Therefore, in the present invention, the piston valve slides due to the centrifugal force accompanying the first piston part that blocks the passage leading from the storage chamber to the working chamber and the second piston part that blocks the passage leading from the working chamber to the storage chamber. It is an object of this invention to solve the drawbacks of the above-mentioned conventional device by configuring the device to move.

Moreover, the second invention of the present application aims to further improve the effect of the first invention by making the shape of the piston pulp into a special shape.

Embodiments of the first invention will be described below with reference to the accompanying drawings.

A drive shaft l in FIG. 1 is a shaft driven by an automobile engine (not shown) via a fan belt. A case 8 is supported on this drive shaft 1f via a ball bearing 2 so as to be freely rotatable. A cover 4 is fixed to the case 8 with bolts 5. A rotor 6 is housed in the hollow interior formed by the cover 4 and the case 3, and the center of the rotor 6 is connected to the drive shaft splined. It is then crimped and fixed one more time. Therefore, the rotor 6 rotates integrally with the drive shaft 1. Moreover, the rotor 6 is mounted in a case 8. It can rotate without contacting the inner surface of the cover 4 with a slight gap therebetween.

The rotor 6 is provided with a communication hole 6a.

A partition plate 10 is fixed inside the cover 4,
The internal space is divided into a working chamber 11 and a storage chamber 12 by this partition plate 10, and a certain amount of viscous fluid (such as silicone oil) is accommodated inside.

The partition plate 10f has a protrusion 10m formed thereon, and
Bolts 4a for attaching a cooling fan (not shown) are driven and fixed on the outer circumference of the cover 4, and the shaft 18 is fitted on the center part so that it can rotate freely around its axis. has been done. An O-ring 14 for preventing oil leakage is attached to the outer circumference of the °C1 shaft 13, and a bolt 15 is attached to the right end.
A plate pulp 16 is fixed by twisting one.

Therefore, the plate valve 16 integrally rotates once when the shaft 18 rotates. One end 17m of a spiral-shaped bimetal 17 is locked on the left end 1 of the shaft 13, and the other end 17b supports a holder 18f. The bimetal 17 is connected to a fugiator (not shown), detects the temperature of the cooling water in the radiator, and rotates the shaft 18 via the end 17m to open the plate valve 16 when the temperature reaches a certain level or higher. The first reason is that the holder 18 rotates integrally with the cover 4, but the plate valve 16 normally rotates integrally with the cover 4, but it is a bimetal/L'
l? When activated, it rotates and swings at the same time.

At the outer peripheral end F of the partition plate 1O, a piston valve 81 is slidably attached to the cylinder 10b (the second
(see figure). The valve 31 is formed with a first piston part 31m and a second piston part 81b.
The end surface of b is the spring 3 whose one end rests on the stopper 82.
31, thereby being biased in the direction of the drive shaft l. The partition plate 10 also has communication holes 10c, 10d, 10e, 10.
Fig. 2 shows that the first piston part 31a cross-cuts the communication between the hole 10c and the rod opening, and the second histone part B
lb blocks communication between holes 10e and 10f, and plate valve 16 closes the entrance of hole 10o.

Next, the operation of the device of the present invention will be explained.

(1) When starting the engine First, when the ignition switch is turned on to start the engine, the shaft 1 and the rotor 6 rotate integrally by the driving force from the engine. 1 in the working chamber is small'#
Since the hydraulic oil of i[ remains, this oil is present in the small gap between the outer part of the rotor 6 and the case 8, and the rotational force of the rotor 6 is transmitted to the case 81 by the rotation ρ. Since the amount of oil in the working chamber 1 is small, compared to the rotation speed of the rotor 6,
The rotation speed of the partition plate 10, which is the driven side, is extremely small. However, the force of the spring 88 is set to be small.

Piston pulp 8 due to the centrifugal force accompanying the rotation of the driven side
1 moves outward in the radial direction one distance against the biasing force of the spring 88.

Therefore, the pulp 31 is in an open state, and the hole IQc and 10d
Also, the holes loe and 1Of communicate with each other.

On the other hand, after a short period of time after the engine starts, the water temperature in the fugiator (not shown) increases.
7 is activated, the plate valve 16 is swung in a direction perpendicular to the paper plane of FIG. 2, and the hole 10c and the storage chamber 12 are brought into communication. Therefore, the oil in the storage chamber 12.

chamber] 2 → hole 10e → hole 10d → working chamber 11. As a result, the rotational force of the rotor 6, which is the driving side, increases in case 3, which is the driven side, because the amount of oil that is the inclusion increases. Cover 4. This is transmitted to the partition plate 10 as a large force. Therefore, the rotational speed of the driven side increases in proportion to the amount of oil that enters the working chamber 11.

Here, due to the effect of the protrusion 10a, a large amount of oil in the working chamber 11 exists on the outer periphery of the chamber 11 due to centrifugal force, and some of this oil rotates less than the rotation of the rotor 6. The protrusion 10 collides with it. This generates hydraulic pressure, which flows with a certain force from the hole 10e to the hole 10f (this action of colliding with the protrusion 10a and generating pressure, which becomes an oil flow, is hereinafter referred to as "pumping action"), and flows into the storage chamber 12. do. As a result, the amount of oil in the working chamber 11 is maintained constant vi1, and the oil is transferred from the storage chamber 12 → hole 10a-+hole 10d-+working chamber ll → hole 10.
It circulates between both chambers 11 and 12 in the order of 6→hole 10f→storage chamber 12. This circulation also occurs when the engine is idling (the engine speed is normally 500 r, p, m).

(2) When the engine becomes too cold, as during high-speed operation, the engine speed increases and the rotation speed of the cooling fan (not shown) increases, causing the engine to become too cold. If so, change the temperature of the cooling water to Bimetal Ivl? is detected, and the plate valve 16 blocks the communication from the storage chamber 12 to the hole 10o as shown in FIG. As described above, this interruption is achieved by the pulp plate 16 swinging in the direction perpendicular to the plane of the paper in FIG.
2 to the working chamber 11 decreases.

On the other hand, due to the above-mentioned "differential 1 action", from the working chamber 11 to the hole 1.
Since the flow to the storage chamber 12 via 0a and 10f continues as long as there is a difference in the rotational speed between the driving side and the driven side, the amount of oil in the working chamber 11 decreases as a result.

Therefore, the rotation speed of the cover 4 and the rotation speed of the cooling fan, which are the driven side, are reduced, and the engine is prevented from becoming too cold.

(8) When the engine is stopped If the next time the engine is stopped by turning off the evening light switch, the drive side shaft l and the rotor 6 will rotate by inertia, albeit for a short time. The driven side rotates for a longer period of time due to ``tangle''. Here, the spring 88 is set so that when the engine speed becomes lower than the idle speed, the piston valve 31 shown in FIG. 2 is closed by the biasing force 1 of the spring 88.

The moment the engine speed becomes lower than the idle speed, the pulp 81 is closed and communication between the storage chamber 12 and the working chamber 11 is cut off.

As described above, the present invention provides a drive shaft that is linked to an engine, a case and a cover that are freely rotatably provided on the drive shaft, and a case and a cover that are fixed to the drive shaft in a hollow interior formed by the case and the cover. The rotor maintains a small clearance with the inner surface of the case and cover.

A fluid coupling having a partition plate that divides the hollow interior into a storage chamber for a viscous fluid and a working chamber for accommodating the rotor, and a pulp plate that can swing according to the temperature of the cooling water in the radiator, from the storage chamber. The first part can block the passage leading to the working chamber.
A piston valve having a piston part and a second piston part that blocks a passage leading from the working chamber to the storage chamber, and a spring means 1 biasing the piston valve in the direction of the drive shaft.
Since it consists of the above components, when the ignition switch is turned off and the engine is stopped, the amount of oil in the operating chamber can be reduced. It warms up quickly and can shorten the warm-up time. Furthermore, since the piston-shaped valve 1 can block both the communication from the storage chamber to the working chamber and vice versa, the sealability is superior to that of the conventional oscillating type valve 1. .

Next, the first aspect of the configuration of the second invention will be explained.

The second invention is the relationship between the piston valve 131 and the holes 10o, 10d, 10s, and 10f as shown in FIG.
, x y” ll slide against song 8, 8r11
Between the end face of the piston part 181m and the hole 10c, lod 1
The gap n created between the end surface of the second piston part 181b and the holes 10e and 10r is larger than the gap 1tJm during which this occurs (that is, the relationship m(n) is established). The other configurations are the same as the first invention described above.

Regarding the operation of the second invention, when starting the engine and when the engine becomes "too cold", the above-mentioned first invention applies.
Since it is the same as (1) and f21 of the operation of the invention, the explanation will be omitted.

When the engine is stopped, the shaft 1 and rotor 6 on the 1w side rotate by inertia, albeit for a short time. and,
The driven side rotates for a slightly longer time due to the tangle.

8 when the engine speed is lower than the idle speed.
The first piston portion 131m in the figure is the hole 10o.

Since the spring 88 is set to cut off the communication between the holes 10d and 10d, the moment the engine speed becomes lower than the idle speed, the first piston portion 181a1 stops the communication from the hole 10o to the hole 10d as described above. (Here, the plate pulp 16 normally does not block the holes 10c, except when the cooling water temperature is low).

However, as mentioned above, since the relationship is m (n), even if the holes 10c and 10d are cut off, the holes 10e and
10f is not interrupted by passing through the second piston portion 181b. During this short period of time when the oil is not shut off, the residual oil in the working chamber 11 flows into the storage chamber 12 through the holes 10e and 1Of by the pump action described above.

In this way, in the second invention, after the first piston part cuts off the communication from the storage chamber to the working chamber, the second piston part cuts off the communication from the working chamber to the storage chamber after a certain time delay. The amount of oil remaining in the working chamber can be further reduced than in the first invention, and therefore the effects of the first invention can be further improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the first invention, FIG. 8 is a partially enlarged view of FIG. 1, and FIG. 8 is a sectional view similar to FIG. 2 showing an embodiment of the second invention. . In the figure, l is a drive shaft, 8 is a case, 4 is a cover, 10 is a partition plate, 11 is an operating chamber, 12 is a storage chamber, 16 is a pulp plate,
81 and 181 are piston pulps, 81M+181a is a first piston part, and 31b and 181b are second piston parts. Patent applicant Hiroshi Okawa, patent attorney for Aisin Seiki Co., Ltd.

Claims (1)

[Scope of Claims] (11) A drive shaft interlocked with an engine, a case and a cover provided on the drive shaft so as to be able to freely rotate; A rotor that is fixed and maintains a small gap with the inner surfaces of the case and cover. A partition plate that divides the hollow interior into a viscous fluid storage chamber and a working chamber that accommodates the rotor. A fluid coupling having a movable plate valve, a piston pulp having a first piston part capable of blocking a passage leading from the storage chamber to the working chamber, and a second piston part capable of blocking the passage leading from the working chamber to the storage chamber; A temperature-sensitive viscous fluid coupling characterized by comprising one or more components of spring means urging the piston pulp in the direction of the drive shaft. (2) A drive shaft interlocked with the engine, and a spring on the drive shaft. A case and a cover that are provided to be freely rotatable; a rotor that is located in a hollow interior formed by the case and the cover, is fixed to the drive shaft, and maintains a small clearance from the inner surface of the case and the cover. A fluid coupling E having a partition plate that divides the hollow interior into a storage chamber for a viscous fluid and a working chamber for accommodating the rotor, and a pulp plate that can swing according to the temperature of the cooling water in the radiator, is installed from the storage chamber. The first part can block the passage leading to the working chamber.
Biaton pulp having a piston part and a second piston part capable of blocking a passage leading from the working chamber to the storage chamber, and a spring means 9 or more components biasing the piston pulp in one direction of the drive shaft. Then, when the piston pulp is biased by the spring means and the first piston part blocks the communication from the storage chamber to the working chamber, the second piston part or later the communication from the working chamber to the storage chamber. A temperature-sensitive viscous fluid joint characterized in that it is configured to shut off.