JPH083719Y2 - Fluid fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention uses a fluid medium and transmits a torque between input and output members that rotate relative to each other, for example, a fluid such as a fan coupling for an internal combustion engine. Regarding fittings.

<< Prior Art >> As a conventional fluid coupling of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 58-149426. This fluid coupling twists (rotates) the valve plate through the shaft to change the opening degree of the outflow hole when the ambient temperature near the temperature sensitive member changes, by operating the temperature sensitive member, The fluid supply was controlled.

<< Problems to be Solved by the Invention >> However, in such a conventional example, since the fluid supply amount is controlled by the twist angle of the valve plate, the twist of the valve plate is Although it becomes sensitive to temperature changes, the ambient temperature must continue to rise until the point at which the fluid coupling should operate, and operation with a time lag is seen from the responsiveness of the coupling operation (coupling operation). To do. For example, there is a problem in that it takes a long time to sufficiently open (or close) the outflow hole because the opening area gradually increases or decreases by rotating in the circumferential direction.

The present invention has been made in view of the above-mentioned problems, and the purpose thereof is to increase the opening of the outflow hole so that the fluid can be immediately supplied and the operating state has good responsiveness. Another object of the present invention is to provide a fluid coupling capable of improving joint performance (coupling performance).

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a partition wall in an output member rotatably supported by an input member, and the partition wall allows the output member to work with a storage chamber. And a drive member fixed to the input member is housed in the working chamber, and an outlet hole for communicating the storage chamber and the working chamber is formed in the partition wall and responds to the ambient temperature. An opening / closing member that is rotated by a temperature-sensitive member is provided, and a valve plate that opens and closes the outflow hole by swinging the opening / closing member in the axial direction of the rotation shaft of the output member faces the outflow hole. It is configured to be provided.

<Operation> When the ambient temperature near the temperature-sensitive member rises, the temperature-sensitive member largely operates, and the opening / closing member acts on the valve plate to open the outflow hole. In this case, the higher the ambient temperature near the temperature sensitive member, the larger the amount of rotation of the opening / closing member, and the larger the opening of the outflow hole. As a result, the fluid in the storage chamber flows into the working chamber to reduce the rotational speed difference between the input member and the output member.

On the other hand, when the atmospheric temperature is lowered, the opening / closing member is operated small due to the movement of the temperature sensitive member, the valve plate is moved in the closing direction, and the opening of the outflow hole is reduced. Therefore, the amount of fluid is reduced, and the difference in rotational speed between the input member and the output member is increased.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing an embodiment of the fluid coupling according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is III-III in FIG. It is sectional drawing which follows the line. In FIG. 1, reference numeral 1 denotes an input member. The input member 1 has a flange portion 2 and a shaft portion 3, and the flange portion 2 is fixed to the engine side (not shown). A body member 5 is attached to the shaft portion 3 via a bearing 4, and a wheel 6 as a driving member is fixed to the shaft portion 3. A plurality of annular grooves 7 are located on the outer peripheral side of the surface of the wheel 6 on the side opposite to the body member 5, and are concentric with the center of the wheel 6, that is, the center of the shaft 3. It is formed on.
In addition, a communication groove 9 formed in the radial direction of the wheel 6 is provided in the annular groove 7 on the surface portion of the wheel 6, and a wiper 10 is formed on the outer peripheral portion of the wheel 6. The communication groove 9 communicates with the wiper 10 through a through hole 11 and forms a passage 12.

An annular fitting surface portion 8 is formed on the peripheral portion of the body member 5, a cover member 14 is provided on the body member 5, and a peripheral end portion of the cover member 14 is provided on the fitting surface portion 8 via a seal member 15. It is fitted and attached. The body member 5 and the cover member 14 constitute an output member 16. This cover member
A shaft bearing 17 is formed at the center of the shaft 14, and the cover member 14 has a circular recess 18 around the shaft bearing 17.
A plurality of annular projections 19 are formed on the surface of the cover member 14 that faces the wheel 6 outside the recessed portion 18.
However, they are formed on a concentric circle centering on the shaft support portion 17, and these ridges 19 are inserted into the annular groove 7 to form a labyrinth 20. The cover member 14
A disk-shaped partition wall is formed inside the so as to cover the recessed portion 18.
21 is provided, and the partition wall 21 divides the inside of the output member 16 into a storage chamber 22 and a working chamber 37 in the recess 18. Also,
A pump portion 23 is formed on the outer peripheral side of the labyrinth 20, a communication hole 24 is formed in the cover member 14 for communicating the storage chamber 22 with the pump chamber 23, and the pump portion 23 is provided with the passage 12
It leads to.

The partition wall 21 has an outflow hole at a position away from the center thereof.
25 are formed. The outflow hole 25 includes an arc-shaped long hole portion 25a having the center of the partition wall 21 as a center and a square hole portion 25b connected to the long hole portion 25a. A valve plate 26 for opening and closing the outflow hole 25 is attached to the back of the partition wall 21 by rivets 261 in a cantilevered manner. A guide member 27 is fixed to a portion of the valve plate 26 exposed to the storage chamber 22. The guide member 27 is formed with an inclined portion 28 that is inclined along the circumferential direction.

A support portion 29 is provided on the outer surface of the cover member 14,
Further, the shaft support portion 17 includes an ankle shaft 30 which is a shaft body.
Is rotatably provided via a seal ring 31, and the inner end of a spiral-shaped bimetal 32, which is a temperature-sensitive member, is attached to the outer end of the ankle shaft 30. Is attached to the support portion 29. A base end portion of an arm 33 is fixed to an inner end portion of the pallet fork shaft 30, and a roller 34 is attached to a tip end portion of the arm 33 by a pin 35, which constitutes an opening / closing member 39. The roller 34 is on the same circumference as the inclined portion 28 of the guide member 27.

 Next, the operation will be described.

From the wheel 6 rotating integrally with the input member 1 to the output member
The torque transmitted to the body member 5 as 16 and the cover member 14 is expressed as a function of the amount of fluid in the working chamber 37. Therefore, when there is little fluid in the labyrinth 20, the difference in rotational speed between the input member 1 and the output member 16 is the largest, and the difference decreases as the amount of fluid increases. .

The valve plate 26 controls the amount of fluid flowing into the working chamber 37 in cooperation with the outflow hole 25 in accordance with a change in the ambient temperature near the bimetal 32, and transfers the fluid between the input member 1 and the output member 16. It acts to control the torque and the rotational speed difference. That is, when the ambient temperature near the bimetal 32 rises, the bimetal 32 expands, and the arm 33 is passed through the ankle shaft 30.
Is rotated clockwise in FIG.

For this reason, the roller 34 rides on the inclined portion 28 of the guide member 27 and bends the valve plate 26 through the guide member 27 as shown by the phantom line in FIG. The outflow hole 25 is opened by rocking in the direction. In this case, the higher the ambient temperature near the bimetal 32, the greater the amount of rotation of the arm 33, the greater the amount of riding of the roller 34 on the inclined portion 28 of the guide member 27, and the greater the degree of opening of the outflow hole 25. Become.

As a result, the fluid in the storage chamber 22 flows into the working chamber 37 to fill the labyrinth 20 with fluid and reduce the rotational speed difference between the input member 1 and the output member 16.

At this time, the fluid entering the working chamber 37 from the outflow hole 25 is directed toward the outer peripheral portion of the working chamber 37 by the centrifugal force and flows into the pump unit 23 via the passage 12, where the pressure is increased, that is, the pump action. Upon receipt, it returns to the storage chamber 22 via the communication hole 24.

On the other hand, when the atmospheric temperature is lowered, the movement of the bimetal 32 causes the arm 33 to rotate in the counterclockwise direction in FIG. 2 so that the roller 34 descends on the inclined portion 28 of the guide member 27, and the guide member 27 moves toward the guide member 27. The pressing force decreases, the valve plate 26 moves in the closing direction by the elastic force, and the opening degree of the outflow hole 25 is reduced.

Therefore, the amount of fluid flowing through the labyrinth 20 is reduced, and the rotational speed difference between the input member 1 and the output member 16 is increased.

When the outflow hole 25 is closed by the valve plate 26, the fluid supply from the storage chamber 22 to the working chamber 37 is cut off. Therefore, the fluid in the working chamber 37 is pumped to the storage chamber 22.
It remains stored in.

If a plurality of opening / closing members 39 in this embodiment are arranged in the circumferential direction and the outflow holes 25 are provided correspondingly,
The flow of the fluid into the working chamber 37 can be controlled in multiple stages. Further, if the inclination angle of the inclined portion 28 of the guide member 27 is arbitrarily set, the working characteristics of the fluid coupling can be changed. Further, the guide member 27 is formed integrally with the valve plate 26, or the guide member 27 is attached to the arm 33 side, and the rollers 34 are attached to the valve plate 26.
It can also be installed on the 26 side.

<Effects of the Invention> As described above, according to the present invention, when the ambient temperature near the temperature-sensitive member changes, the opening / closing member is rotated by the operation of the temperature-sensitive member to operate the valve plate to cause the outflow hole. Since the fluid supply amount is controlled by changing the opening degree of, the opening of the outflow hole becomes large, that is, the fluid can be supplied and the operating condition becomes good with responsiveness. ) Can be improved.

[Brief description of drawings]

1 is a longitudinal sectional view of an embodiment of a fluid coupling according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. Is. DESCRIPTION OF SYMBOLS 1 ... Input member, 16 ... Output member, 22 ... Storage chamber, 25 ... Outflow hole, 26 ... Valve plate, 32 ... Bimetal, 39 ... Opening / closing member.

Claims (1)

[Scope of utility model registration request] 1. A partition is provided in an output member rotatably supported by an input member, and the partition divides the inside of the output member into a storage chamber and a working chamber, and is fixed to the input member in the working chamber. While holding the drive member, the partition wall is provided with an outflow hole that communicates the storage chamber with the working chamber, and an opening / closing member that is rotated by a temperature sensitive member that responds to the ambient temperature is provided. A fluid coupling comprising: a valve plate that opens and closes the outflow hole by swinging in a direction of an axis of a rotation shaft of the output member so as to face the outflow hole.