JPS6238027Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fluid coupling for transmitting torque between relatively rotating input and output members using a fluid medium, which is used in a drive device for a cooling fan device of an internal combustion engine, etc. One end of the center pin, which is rotatably and slidably fitted in the pin receiving hole provided in the cover member, is pressed by a spring attached to the partition plate to prevent the pin from moving in the axial direction. This prevents sliding or wear of the center pin insertion portion caused by the sliding, and prevents leakage of fluid such as silicone oil caused by the wear.

Traditionally, it consists of a body member and a cover member,
an output member that forms a working fluid storage chamber and a working chamber; an input member that is located in the working chamber and forms a fluid shearing space between the output member and is rotatable relative to the output member; , an input shaft to which the input member is attached, and a torque is transmitted from the input member to the output member via the fluid by increasing or decreasing the amount of fluid supplied to the working chamber, in particular the shearing space. A fluid coupling that increases or decreases the amount of water has been proposed.

A case in which the structure of such a fluid coupling is applied as a drive device for a cooling fan device of an internal combustion engine will be briefly described as an example. FIG. 1 is a cross-sectional view of the same, and 1 is an input shaft having a flange portion 2 and a shaft portion 3. The flange portion 2 is fixed to the engine side (not shown), and the input member 4 is fixed to the tip of the shaft portion 3. has been done.

5 is a body member rotatably mounted on the input shaft 1 via a bearing 6, and 7 is a cover member, which forms an annular chamber 8 between opposing inner surfaces, and whose outer periphery is secured by bolts 9... and are fixed to each other to form an output member. The annular chamber 8 is
It is fixed to the cover member 7 and has left and right communication holes 10.
A working chamber 12 and a storage chamber 13 are separated by a partition plate 10 having a diameter of 1.a and a valve plate 11 that can cover and close the communication hole 10a. 14 is a communication hole provided in the cover member 7 and communicating the working chamber 12 and the storage chamber 13.

Reference numeral 15 denotes a spiral bimetal as a temperature sensitive member, the outer peripheral end of which is fixed to the cover member 7, and the inner peripheral end of which is a center pin 16 rotatably fitted into a pin receiving hole 7a provided in the cover member 7. The center pin 16 is fixed to one end of the valve plate 11, and the other end of the center pin 16 is fixed to the valve plate 11. In this way, the valve plate 11 moves the center pin 1 along with the operation of the bimetal 15 in response to changes in the ambient temperature.
6, the communication hole 10 of the partition plate 10
A can be opened and closed.

The input member 4 is rotatably mounted in the working chamber 12, and the input member 4 has a through hole 17 near the center and a through hole 18 near the outer periphery, which communicate from side to side. There is. Each of the facing surfaces of the input member 4 and the body member 5 has a plurality of annular grooves 4a,
5a is provided, forming a shearing space designated S. 19 is a body member 5 which is an output member.
and a fan blade fixed to the cover member 7 with bolts 20.

In this configuration, the storage chamber 13 is filled with a desired amount of working fluid, and when the input member 4 is rotated via the input shaft 1 by an engine (not shown) and the ambient temperature near the bimetal 15 rises, the bimetal 15 responds to this, rotates the valve plate 11 via the center pin 16, and connects the communication hole 10 provided in the partition plate 10 by the valve plate 11.
The cover of a is gradually released and opened to allow the fluid in the storage chamber 13 to flow into the working chamber 12, thereby filling the shearing space S with the fluid. Here, the torque transmitted from the input member 4 to the output member body member 5 and cover member 7 is expressed as a function of the amount of fluid in the working chamber 12, particularly as a function of the amount of fluid in the shear space S. Therefore, the fan blades 19 fixed to the body member 5 and the cover member 7, which are output members, increase their rotational speed as the fluid fills the shear space S, thereby cooling the engine.
Subsequently, the fluid in the working chamber 12 is directed toward the outer periphery of the working chamber 12 by centrifugal force and flows into the pump section.
Then, since the input member 4 is rotating in the direction of the arrow X shown in FIG. The fluid in the working chamber 12 is pumped into the storage chamber 13 through the communication hole 14 and is increased in pressure.

On the other hand, when the ambient temperature near the bimetal 15 decreases, the bimetal 15 reacts to it, closes the communication hole 10a of the partition plate 10 by closing the valve plate 11, and cuts off the supply of liquid from the storage chamber 13 to the working chamber 12. . Therefore, the fluid in the working chamber 12 is stored in the storage chamber 13 by the pump action, the amount of fluid in the shearing space S is reduced, and the rotational speed difference between the input member 4 and the output members 5, 7 is reduced. As a result, the fan blade 19 rotates at idle.

By the way, in this type of conventional fluid coupling, as described above, the center pin 16 was fitted into the pin receiving hole 7a provided in the cover member 7 so as to be rotatable and slidable in the axial direction. When the bimetal 15 vibrates in the X and Y directions due to engine vibrations, the center pin 16 swings as shown in Figures 5 and 6, causing the following problems. There was a drawback of doing so.

(1) The O-ring 22 attached to the pin receiving hole 7a, the insertion part of the center pin 16 into the pin receiving hole 7a, and the outer peripheral surface of the center pin 16 is worn out,
This causes leakage of fluids such as silicone oil and deterioration of coupling performance due to the fluid leakage.

(2) Fixed part 2 on the cover member 7 side of the bimetal 15
3 wear is accelerated and durability deteriorates.

The present invention has been made with the aim of eliminating the above-mentioned conventional drawbacks, and its gist is that a spring 24 is attached to the partition plate 10 as shown in the drawings from FIG. The flange 16a provided at one end of the center pin 16 is pressed against the inner circumferential surface of the cover member 7 by the spring force, thereby eliminating wobbling of the center pin 16.

In the embodiment shown in the drawings, the spring 24 is a plate spring having an arc-shaped curved portion 24a at the center as shown in FIGS. It is attached to the partition plate 10 by. 24c is a rivet receiving hole. Then, press the cross section of one end of the center pin 16 at the center to form the flange 16.
a is brought into contact with the inner circumferential surface of the cover member 7 to eliminate wobbling of the center pin 16. Reference numeral 26 denotes a low-wear material provided on the contact surface between the flange 7a and the cover member 7, and the low-wear material 26 allows the flange 16a to the center pin 16 to slide into contact with and rotate more smoothly with respect to the cover member 7. I'm trying to do what I can. Note that the spring 24 may be a coil spring. In addition, the same parts as in the prior art are given the same reference numerals, and repeated explanation will be omitted.

As explained above, the present invention includes an input shaft, an input member attached to the tip of the input shaft, and an input member housed in an annular chamber that is rotatably attached to the input shaft via a bearing. an output member comprising a body member and a cover member; a partition plate separating an annular chamber of the output member into a fluid working chamber and a fluid storage chamber accommodating the input member; and the partition plate. a valve plate for opening and closing a communication hole between the work chamber and the storage chamber provided in the cover member; a center pin fitted in a pin receiving hole provided in the cover member with the valve plate attached to one end; a bimetal member having one end fixed to the center pin and the other end fixed to the cover member, through which fluid flows through a shear space formed between the input member and the output member in the working chamber; In a fluid coupling for transmitting torque between input and output members, a spring is attached to the partition plate to bring a flange provided at one end of the center pin into contact with the inner circumferential surface of the cover member, as described below. There is an effect.

(1) The spring prevents the center pin from wobbling, which eliminates the wear of the pin receiving hole and center pin caused by the wobbling, and the leakage of fluids such as silicone oil caused by the wear. , it is possible to maintain coupling performance.

(2) It is possible to prevent wear of the fixed part on the bimetal cover member side and improve durability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention as a driving device for a cooling fan device, Fig. 2 is a front view of the inside of a cover member, Fig. 3 is a developed cross-sectional view taken along the line - Figure 4 is a cross-sectional view showing a conventional O-ring mounting structure, Figures 5 and 6 are cross-sectional views showing the drawbacks of the conventional technology, Figure 7 is a cross-sectional view showing the main parts of the fluid coupling of the present invention, and Figure 8. 9 is a front view of the spring used in the present invention, and FIG. 9 is a front view of the same. DESCRIPTION OF SYMBOLS 1...Input shaft, 4...Input member, 5...Body member, 6...Bearing, 7...Cover member, 7a...
Pin receiving hole, 8... Annular chamber, 10... Partition plate, 10
a...Communication hole, 11...Valve plate, 12...
...Working chamber, 13...Storage room, 15...Bimetal, 16...Center pin, 16a...Flange, 24...Spring.

Claims (1)

[Scope of utility model registration request] An input shaft, an input member attached to the tip of the input shaft, a body member and a cover member rotatably attached to the input shaft via a bearing with the input member housed in an annular chamber. an output member, a partition plate separating an annular chamber of the output member into a fluid working chamber accommodating the input member and a fluid storage chamber, the working chamber and the fluid storage provided in the partition plate; A valve plate that opens and closes a communication hole in the chamber, a center pin that is fitted into a pin receiving hole provided in the cover member with the valve plate attached to one end, and one end that is fixed to the center pin. , comprising a bimetal whose other end is fixed to the cover member, and transmits torque between the input and output members through fluid flowing through a shear space formed between the input member and the output member in the working chamber. A fluid coupling for performing the above-mentioned fluid coupling, characterized in that a spring is attached to the partition plate to bring a flange provided at one end of the center pin into contact with the inner circumferential surface of the cover member.