JPH088347Y2 - Fan coupling - Google Patents

Description

TECHNICAL FIELD The present invention relates to a temperature-sensing fan coupling used in a cooling fan of an internal combustion engine for automobiles.

2. Description of the Related Art As a cooling fan installed in an internal combustion engine for automobiles, there is a cooling fan that uses a temperature-sensing fan coupling that senses the ambient temperature behind the radiator and controls the fan speed to a value suitable for that temperature. is there.

An example of the fan coupling used here is as shown in FIG.

In this fan coupling, a housing 1 supporting a fan blade (not shown) has a drive shaft 2 and a bearing 3
The rotor 4 is fixed inside the housing 2 at the tip of the drive shaft 2. The housing 1 includes a housing body 5 supported by the drive shaft 2 and a cover 6 fitted and fixed to the front surface of the housing body 5. Inside the cover 6, the interior of the housing 1 is divided into a storage chamber 7 and a working chamber 8. The partition plate 9 is fixed. Concavities and convexities are formed in the radial direction on the peripheral portion of the rotor 4 and the wall surface of the cover 6 facing the peripheral portion, and the labyrinth groove 10 is formed by the concavo-convex portions. A viscous fluid such as silicone oil is stored in the storage chamber 7, and a partition plate 9 is provided with a through hole 11 for supplying the viscous fluid from the storage chamber 7 to the working chamber 8. A return passage 12 for returning the viscous fluid from the working chamber 8 to the storage chamber 7 is formed near the outer peripheral portion of the. A rotary shaft 13 is supported in the center of the cover 6, and a spiral bimetal 14 having one end fixed to the cover 6 is connected to the tip of the rotary shaft 13 and the base end thereof. A valve plate 15 for opening and closing the flow hole 11 is rigidly connected inside the storage chamber 7.

Then, this fan coupling controls the number of revolutions as follows in response to changes in the ambient temperature.

When the ambient temperature behind the radiator (not shown) is low, the bimetal 14 does not deform and the valve plate 15 closes the flow hole 11. Therefore, the viscous fluid is not supplied from the storage chamber 7 to the working chamber 8. Therefore, the amount of viscous fluid existing in the labyrinth groove 10 portion is small, and therefore the torque transmitted from the rotor 4 to the housing 1 is small. As a result, the number of rotations of the housing 1, that is, the fan blade (not shown) becomes low.

On the other hand, if the ambient temperature behind the radiator (not shown) rises, the rotating shaft
13 rotates, and the valve plate 15 slides in the circumferential direction to open the flow hole 11. Then, the viscous fluid flows into the working chamber 8 and returns from the labyrinth groove 10 through the return passage 12.
Therefore, the labyrinth groove 10 is sufficiently supplied with the viscous fluid, the torque transmitted from the rotor 4 to the housing 1 is increased, and the rotational speed of the housing 1, that is, the fan blade (not shown) is increased (similar technique). Is, for example, JP-A-57-
See 29826 publication).

Problems to be Solved by the Invention Generally, in such a fan coupling,
If the opening area of the flow hole 11 is large, the supply amount of the viscous fluid to the working chamber 8 immediately increases when the ambient temperature rises. Therefore, the larger the opening area of the flow hole 11, the better the response of the air volume control. Become. Therefore, from the viewpoint of the responsiveness of air volume control, it is desired to increase the opening area of the flow holes 11.

However, in the above-described conventional fan coupling, the opening area of the through hole 11 cannot be increased due to the following reason, which causes a problem.

When the circulation hole 11 is widened in the circumferential direction, the rotation angle of the rotating shaft 13 at the time of temperature rise must be increased.
Due to the structure in which 13 and the valve plate 15 are rigidly connected, bimetal 14 is used as a means to increase this rotation angle.
There is no choice but to increase the number of turns. However, increasing the number of turns leads to an increase in weight and cost, and in particular, when the weight of the bimetal 14 increases, the natural frequency of the bimetal 14 itself decreases and the durability against vibration decreases.

Further, when expanding the through hole 11 in the radial direction, the partition plate 9
Since there is no choice but to increase the diameter of the device itself, there arises a problem that the entire device becomes large.

Therefore, the present invention is to provide a fan coupling which is free from problems such as an increase in weight, an increase in cost, and an increase in size of the entire apparatus, and which is excellent in responsiveness of air volume control with respect to ambient temperature change.

Means for Solving the Problems As one means for solving the above problems, a housing rotatably supported by a drive shaft, and a partition plate partitioning the inside of the housing into a storage chamber and a working chamber, A circulation hole formed in the partition plate for supplying a viscous fluid from the storage chamber to the working chamber; a rotor coupled to the drive shaft inside the working chamber; and a valve body for opening and closing the circulation hole. A fan coupling comprising a rotary shaft rotatably supported in the center of the housing to operate the valve body, and a temperature-sensing member that drives and rotates the rotary shaft according to an ambient temperature. The valve body is linked with the rotation angle amplifying means, and the rotation support center of the valve body is arranged between the rotation shaft and the outer peripheral end of the partition plate.

As another means, the rotary shaft and the valve body are linked with each other through a linear motion converting means for converting the rotary motion of the rotary shaft into a linear motion along the radial direction of the partition plate.

In the case of the former means, when the temperature sensing member senses the ambient temperature and rotates the rotary shaft, the rotation angle of the rotary shaft is amplified by the rotation angle amplifying means, and the valve body is rotated at the large amplified rotation angle. As a result, the circulation holes will be opened and closed. And
At this time, the valve body rotates around the rotation support center between the rotation shaft and the outer peripheral end of the partition plate.

Further, in the latter means, when the temperature sensitive member senses the ambient temperature and rotates the rotary shaft, the rotation is converted into linear motion along the radial direction of the partition plate by the linear motion conversion means, and as a result, the valve The body is displaced in the radial direction of the partition plate to open and close the flow hole.

Embodiment Hereinafter, a first embodiment of the present invention corresponding to claim 1 will be described with reference to FIGS. 1 and 2, and a second embodiment corresponding to claim 2 will be described with reference to FIGS. explain. still,
The same parts as those shown in FIG. 6 are designated by the same reference numerals, and the description of the overlapping parts will be partially omitted.

 First, the first embodiment will be described.

In FIGS. 1 and 2, the fan coupling has a housing 1 supported by a drive shaft 2 via a bearing 3.
The inside of the housing 1 is divided into a storage chamber 7 and a working chamber 8 by a partition plate 9, and the rotor 4 is coupled to the tip of the drive shaft 2 inside the working chamber 8 and the peripheral portion of the rotor 4. A labyrinth groove 10 is formed by the wall surface of the cover 6 facing this, a circulation hole 11 is formed in the partition plate 9, a return passage 12 is formed in the vicinity of the outer peripheral portion of the cover 6, and the circulation hole 11 is formed by the valve plate 15. The basic structure such as the point of sliding opening and closing, the point that the rotary shaft 13 is supported at the center of the cover 6, and the bimetal 14 as the temperature sensitive member is connected to the rotary shaft 13 is shown in FIG. It is similar to the conventional one.

In the case of this fan coupling, the way in which the rotary shaft 13 and the valve plate 15 are linked is very different from that shown in FIG. 6, and the rotary shaft 13 and the valve plate 15 are not directly connected but the rotation angle is not directly connected. It is linked through the amplification means 16.

The rotation angle amplifying means 16 is composed of a first gear 17 that is caulked at the base end of the rotary shaft 13 and a second gear 18 that has a valve plate 15 welded to the end face. The first gear 17 is larger than the second gear 18 and has a notch 19 formed in a part of its outer peripheral portion, and both ends of the notch 19 are engaged with pins 20 projecting from the inner wall of the cover 6. Then, the rotation angle is regulated. The second gear 18 is rotatably supported on the inner wall of the cover 6 via a pin 21, and meshes with the first gear 17, and the ratio of the diameter to the first gear 7, that is, the number of teeth. A rotation angle that is inversely proportional to the ratio of is obtained. The pin 21 serves as a rotation support center of the valve plate 15, and this rotation support center (pin 21) is arranged between the rotation shaft 13 and the outer peripheral end of the partition plate 9 as shown in FIGS. ing. Since the first gear 17 has a larger diameter and a larger number of teeth than the second gear 18, the rotation of the rotary shaft 13 is amplified by the first gear 17 and the second gear 18.

In the above structure, when the ambient temperature behind the radiator (not shown) rises above a predetermined temperature, the bimetal 14 is deformed, and the rotary shaft 13 and the first gear 17 rotate accordingly. This rotation is amplified by the second gear 18, and the valve plate 15 integrated with the second gear 18 is slid in the circumferential direction of the partition plate 9 by the amplified rotation angle. Therefore, if the same bimetal 14 as the conventional one is used, the movement amount of the valve plate 15 becomes larger than that of the conventional one. Here, if the circulation holes 11 are formed by expanding in the circumferential direction of the partition plate 9 in advance, the viscous fluid in the storage chamber 7 will be immediately supplied to the working chamber 8 through the circulation holes 11. . As a result, the torque transmitted from the rotor 4 to the housing 1 is instantly increased, and the responsiveness of the air volume control to the ambient temperature change is improved. Also, the valve plate 15 is
Since the pin 21 arranged between the rotary shaft 13 and the outer peripheral end of the partition plate 9 is pivotally displaced, the rotation orbit of the valve plate 15 gradually enters from the radially outer side to the inner side of the partition plate 9, For this reason, there is no concern that the valve plate 15 will interfere with other members arranged radially outside the partition plate 9 during its rotation.

In the above embodiment, the second gear 18, the valve plate 15, the flow hole 11 and the like are provided one by one, but a plurality of these are provided respectively to supply various viscous fluids. It is also possible to control.

 Next, a second embodiment will be described.

3 to 5, this fan coupling is different from the one shown in the first embodiment in how the bimetal 14 and the valve plate 15 are linked with each other, instead of the rotation angle amplifying means 16, a linear motion converting means 22. I try to link each other through. The other parts have the same structure as that shown in the first embodiment.

The linear motion deforming means 22 comprises a gear 23 caulked at the base end of the rotary shaft 13 and a slider 26 to which the valve plate 15 is fixed and which is held on the inner wall of the cover 6 via guide members 24 and 25. It is configured. An opening 27 is formed in the slider 26 along the longitudinal direction.
The rack 28 is fixed to one surface of the 27 extending in the longitudinal direction. In this rack 28, the slider 26 has guide members 24, 2
It is meshed with the gear 23 in the state of being held by 5. When the gear 23 rotates, the slider 26 is guided by the guide members 24 and 25 and linearly moves in the radial direction of the partition plate 9.
The amount of movement of the slider 26 can be appropriately changed by changing the diameter of the gear 23, that is, the number of teeth. Further, reference numeral 29 in the figure denotes a set plate fixed to the partition plate 9 with screws 30, and the width of the set plate 29 is a through hole.
It is formed to have the same width as the width of 11, and the tip end faces the through hole 11. The screw hole 31 formed in the set plate 29 is a long hole, and the fixing position of the set plate 29 can be freely changed as necessary to increase or decrease the size of the flow hole 11 in the radial direction of the partition plate 9. It is like this. This is bimetal
Since the timing at which the valve plate 15 opens the flow hole 11 varies depending on the temperature when the 14 is assembled, the variation is eliminated by correcting the position of the set plate 29.

In such a configuration, when the ambient temperature behind the radiator (not shown) rises, the shape of the bimetal 14 changes, and accordingly, the rotary shaft 13 rotates integrally with the gear 23 by a predetermined angle. When the gear 23 rotates, the rack 28 meshing with the gear 23 linearly moves together with the slider 26, and the valve plate 15 fixed to the slider 26 slides on the upper surface of the partition plate 9 to open the flow hole 11. As a result, the viscous fluid is supplied to the working chamber 8 through the circulation hole 11. In the case of this fan coupling, since the valve plate 15 slides linearly, if the width of the flow hole 11 and the valve plate 15 is made wide in advance, the viscous fluid will be immediately generated when the flow hole 11 is opened. It is supplied to the working chamber 8. By doing so, the responsiveness of the air volume control to the ambient temperature change is improved.

Incidentally, in the embodiment shown here, the slider 26,
The valve plate 15, the flow hole 11 and the like are provided one by one, but a mode in which a plurality of these are provided can also be adopted.

As described above, in the invention of claim 1 of the present application, since the rotating shaft and the valve body are linked through the rotation angle amplifying means, the rotation angle of the valve body with respect to the deformation of the temperature sensing member is increased. In addition, the rotation support center of the valve disc is located between the rotary shaft and the outer peripheral edge of the partition plate, so that the rotation trajectory of the valve disc gradually enters from the radially outer side to the inner side of the partition plate. Thus, it is possible to avoid the valve body from interfering with the member at the peripheral edge of the partition plate. Therefore, the circulation holes can be expanded in the circumferential direction of the partition plate having a sufficient space to expand the circulation holes.

Further, the invention of claim 2 of the present application provides a rotary shaft and a valve body,
Since the rotary motion of the rotary shaft is linked through the linear motion conversion means for converting the rotary motion into the linear motion along the radial direction of the partition plate,
It is possible to expand the circulation hole by expanding the circulation hole in the circumferential direction of the partition plate having a sufficient space.

Therefore, the flow rate can be controlled by enlarging the flow hole and increasing the temperature without increasing the weight and cost of the temperature-sensing member and increasing the size of the entire device by increasing the diameter of the partition plate in the radial direction of the partition plate. Will be able to improve the responsiveness of.

[Brief description of drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, FIG. 3 is a sectional view showing a second embodiment of the present invention, and FIG. Fig. 3 is an IV arrow view, and Fig. 5 is V in Fig. 3.
FIG. 6 is a sectional view showing a conventional technique. 1 ... Housing, 2 ... Drive shaft, 4 ... Rotor, 7 ...
… Storing chamber, 8 …… Operating chamber, 9 …… Partition plate, 11 …… Flow hole, 13 …… Rotating shaft, 14 …… Bimetal (temperature-sensitive member), 15
...... Valve plate (valve body), 16 ... Rotation angle amplification means,
22 …… Linear motion conversion means.

Claims (2)

[Scope of utility model registration request] 1. A housing rotatably supported by a drive shaft, a partition plate for partitioning the interior of the housing into a storage chamber and a working chamber, and a viscous fluid perforated from the storage chamber by perforating the partition plate. A flow hole that is supplied to the working chamber, a rotor that is coupled to the drive shaft inside the working chamber, a valve body that opens and closes the flow hole, and a valve body that is rotatably supported at the center of the housing. In a fan coupling including a rotary shaft for operating the rotary shaft and a temperature-sensitive member for driving and rotating the rotary shaft in accordance with an ambient temperature, the rotary shaft and the valve body are linked through a rotation angle amplifying means, The rotation support center of the valve body,
A fan coupling arranged between the rotary shaft and an outer peripheral edge of the partition plate. 2. A housing rotatably supported by a drive shaft, a partition plate for partitioning the interior of the housing into a storage chamber and a working chamber, and a viscous fluid perforated from the storage chamber by perforating the partition plate. A flow hole that is supplied to the working chamber, a rotor that is coupled to the drive shaft inside the working chamber, a valve body that opens and closes the flow hole, and a valve body that is rotatably supported at the center of the housing. In a fan coupling including a rotating shaft for operating the rotating shaft and a temperature-sensing member for driving and rotating the rotating shaft according to an ambient temperature, the rotating shaft and the valve body are rotated by a diameter of a partition plate. A fan coupling, characterized in that they are linked through a linear motion converting means for converting into a linear motion along a direction.