JP2002295519A - Temperature sensitive type fan coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature sensitive type fan coupling device which enables temperature control with higher accuracy based upon the atmospheric temperature. SOLUTION: The introducing amount of viscous fluid introduced between a rotor 52 and a housing 54 to transmit driving force from the rotor 52 to the housing 54 is adjusted by rotational displacement of a rotating valve 61. While a bimetal 62 sensing the atmospheric temperature is provided outside a housing 54, a bimetal 21 sensing the temperature in the housing is provided inside it. The bimetal 62 is deformed by sensing the atmospheric temperature so that the bimetal 21 is rotationally displaced. While receiving rotational displacement from the bimetal 62, the bimetal 21 itself is deformed by sensing the inside temperature of the housing 54 so as to rotationally displace the rotating valve 61 by taking the displacement into account as the displacement in the direction opposite to the rotational displacement from the bimetal 62. By so doing, the influence exerted by temperature rise of the housing 54 is compensated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature-responsive fan coupling device in which the rotational driving force of a fan is transmitted by viscous fluid and the rotation of the fan is adjusted based on the ambient temperature sensed by a temperature-sensitive member. .

[0002]

2. Description of the Related Art In general, an internal combustion engine mounted on a vehicle or the like, as a cooling fan, can adjust the amount of air in response to the temperature of cooling air that has undergone heat exchange from a cooling medium of the internal combustion engine. A temperature-responsive fan coupling device is used.

As shown in FIG. 4, for example, this temperature-responsive fan coupling device has a drive shaft 151 which is drivingly connected to a crankshaft (not shown) of an internal combustion engine, and which is fixed to a tip end thereof. The rotor 152 is integrally formed with the rotor 151, and the housing 152 includes the rotor 152 and is supported by the drive shaft 151 by a bearing 153.

A plurality of blades (not shown) are provided on an outer peripheral portion of the housing 154. The housing 154, which receives a driving force from the drive shaft 151, rotates together with the blades to function as a cooling fan. On the other hand, a partition plate 155 fixed to the housing 154 and rotating integrally therewith is provided inside the housing 154. The partition 155 divides the inside of the housing 154 into two spaces, a storage chamber 156 for storing a viscous fluid described below and a driving force transmission chamber 157. A rotor 152 formed in a disk shape is accommodated in the driving force transmission chamber 157, and a plurality of concentric rings 171 are formed on both surfaces of the outer edge of the rotor 152 so as to protrude. These rings 171 have a comb-shaped cross section in the radiation direction, and the housing 1
A labyrinth groove 158 corresponding to the concavo-convex shape of the ring 171 is provided in a portion of the ring 54 and the partition plate 155 facing the ring 171 to form a driving force transmission unit 170. A predetermined amount of a viscous fluid such as silicone oil is sealed inside the housing 154 as hydraulic oil, and the hydraulic oil is introduced into the driving force transmission unit 170. In the driving force transmission unit 170, the driving force transmission capability from the rotor 152 to the housing 154, that is, the transmission torque, is adjusted according to the amount of the hydraulic oil introduced.

The hydraulic oil sealed in the housing 154 is allowed to communicate between the storage chamber 156 and the driving force transmission chamber 157 by the return hole 159 and the introduction hole 160 provided in the partition plate 155. The return hole 159 is the partition plate 1.
When the rotor 152 rotates, the hydraulic oil is supplied from the driving force transmission chamber 157 to the storage chamber 156 through the return hole 159 as a communication path from the driving force transmission chamber 157 to the storage chamber 156. It is configured to flow. On the other hand, the introduction hole 160 is provided on the inner periphery of the labyrinth groove 158 of the partition plate 155, and the opening thereof is adjusted by a rotary valve 161 which is a valve disposed in the storage chamber 156.

[0006] The rotary valve 161 includes a bearing 17.
2 and is rotatably displaceable with respect to the housing 154, and is operatively connected to a spiral bimetal 162 that is disposed outside the housing 154 and that gives a rotational displacement to the shaft 173 based on the ambient temperature. . That is, the relative angle of the rotary valve 161 with respect to the partition plate 155 is determined according to the ambient temperature sensed by the bimetal 162, and the opening of the introduction hole 160 is determined based on the relative angle. According to the opening degree of the introduction hole 160 determined in this way, the amount of hydraulic oil introduced from the storage chamber 156 to the driving force transmission chamber 157 is determined. Further, the transmission torque of the driving force from the rotor 152 to the housing 154 is determined according to the amount of the hydraulic oil introduced.

In the above structure, the bimetal 1
When the ambient temperature sensed by 62 is low, the rotation valve 16
1 closes the introduction hole 160. Therefore, the working oil is not introduced from the storage chamber 156 to the driving force transmission chamber 157 through the introduction hole 160. On the other hand, the driving force transmission chamber 15
7 is returned to the return hole 1 by centrifugal force of the rotor 152.
It is guided to the storage room 156 through 59. For this reason, the amount of hydraulic oil in the storage chamber 156 decreases, the torque transmitted from the rotor 152 to the housing 154 decreases, and the rotation speed of the housing 154, that is, the rotation speed of the fan, decreases, and finally stops. When the ambient temperature sensed by the bimetal 162 is high, the rotary valve 161 has the opening 160 corresponding to the sensed temperature.
Is open. Therefore, the hydraulic oil according to the opening degree of the introduction hole 160 is introduced from the storage chamber 156 receiving the inflow pressure of the hydraulic oil through the return hole 159 to the driving force transmission chamber 157. In this way, a predetermined amount of hydraulic oil is secured in the driving force transmission chamber 157, and the torque transmitted from the rotor 152 to the housing 154 is maintained.
4, ie, the fan rotates.

[0008]

In the above-described temperature-responsive fan coupling device, the bimetal 16
The rotation of the fan is adjusted based on the ambient temperature sensed by 2. However, the temperature actually sensed by the bimetal 162 is not determined only by the ambient temperature.

That is, the rotor 152 and the housing 15
When the driving force is transmitted to the hydraulic motor 4 via the hydraulic oil, heat is inevitable, and the amount of generated heat increases as the rotation speed of the fan increases. Then, due to a part of the heat generated here, the temperature of the hydraulic oil in the entire fan coupling device, in particular, in the housing 154 rises,
The heat is transmitted from the rotary valve 161 to the bimetal 162 via the shaft 173 by heat conduction. Further, the bimetal 162 is irradiated with radiant heat from the housing 154 whose temperature has increased due to the generated heat.

After all, due to these factors, the temperature sensed by the bimetal 162 may be higher than the actual ambient temperature, that is, the temperature in front of the fan. In particular, this tendency appears remarkably when transitioning from a high temperature to a low temperature.

FIG. 5 shows the introduction hole 1 formed by the rotary valve 161.
60 has three stages, namely “Off (closed)”, “M
id (half open) ”and“ Hi (full open) ”, the ambient temperature of the bimetal 162 and the shaft 17
FIG. 4 is an explanatory diagram showing a relationship between a rotation angle of No. 3 and an opening degree of a rotation valve 161. The housing 154, that is, the fan, is stopped when the rotation angle of the rotation valve 161 is in the “Off” position area, rotates at a high speed when the rotation angle is in the “Hi” position area, and is in the “Mid” position area. , It rotates at an intermediate speed.

In such a fan coupling device, as shown in FIG. 5, as the ambient temperature sensed by the bimetal 162 rises, the rotating valve 161
The opening degree of the introduction hole 160 from “Off” to “Mi”
d "and" Hi ". However, as described above, since the temperature rise of the fan coupling device itself affects the temperature sensed by the bimetal 162, the bimetal 162 senses a temperature higher than the actual ambient temperature. That is, the rotation valve 161
The rotation angle of the curve C shown in FIG. 5 by only the rise of the ambient temperature to be sensed by the original bimetal 162 is
The characteristic that should be 11 is actually a characteristic like curve C12 under the influence of other factors as described above. The difference D between the curves C11 and C12 increases when the ambient temperature is high and the fan rotates at high speed. In particular, when the ambient temperature decreases from the high temperature state, the temperature sensed by the bimetal 162 greatly deviates from the actual ambient temperature because the fan coupling device itself is already operating in a state where the temperature has increased. (Corresponding to the broken line in FIG. 5).

When the temperature sensed by the bimetal 162 transitions from a high temperature to a low temperature, the delay in the closing operation of the rotary valve 161 means that the fan coupling device operates more than necessary, and the object to be cooled is reduced. It also leads to excessive cooling. For this reason, for example, in this internal combustion engine, excessive cooling air is drawn into the radiator to overcool the internal combustion engine, and problems such as deterioration of fuel efficiency and generation of noise due to operation of the fan coupling device are caused. It could be.

Conventionally, for example, Japanese Patent Application Laid-Open No. Sho 62-3172
No. 6, as disclosed in Japanese Unexamined Patent Publication No. 6, a bypass passage is provided when hydraulic oil passes through a labyrinth structure that is a driving force transmission unit,
There is also known a fan coupling device in which the rotation of the fan is adjusted by quickly opening and closing the bypass passage to quickly follow the ambient temperature of a temperature-sensitive member such as a bimetal. However, even with this fan coupling device, it is not possible to eliminate the effect of the temperature rise of the device itself on the temperature-sensitive member.

Further, the present invention is not limited to the case where it is used as a cooling fan of a vehicle equipped with an internal combustion engine as described above, but is applied to other temperature-responsive fan coupling devices that operate based on a temperature-sensitive member such as a bimetal. Even so, the fact that the rise in temperature itself has a considerable effect on the temperature-sensitive member is almost common.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a temperature-responsive fan coupling device that enables more accurate temperature control based on the ambient temperature.

[0017]

The means for achieving the above object and the effects thereof will be described below. The invention according to claim 1 has a rotor connected to a drive shaft and a housing surrounding the rotor, and the rotor and the housing are connected to each other in accordance with a temperature sensed by a temperature sensing member provided outside the housing. A temperature at which a viscous fluid is introduced therebetween, and the rotor and the housing are coupled based on a shear force of the introduced viscous fluid, and a fan provided in the housing is rotated with the rotation of the drive shaft. The gist of the sensitive type fan coupling device is to include a temperature compensating means for compensating a temperature sensed by the temperature sensing member according to a temperature of the housing.

According to the above configuration, the temperature sensed by the temperature sensing member provided outside the housing can be compensated according to the temperature of the housing. For this reason, the amount of the viscous fluid introduced between the rotor and the housing can be adjusted in such a manner that the temperature outside the housing is more accurately reflected. Therefore, more accurate temperature control as the temperature-responsive fan coupling device is realized.

According to a second aspect of the present invention, in the temperature-responsive fan coupling device according to the first aspect, the temperature compensating means has a temperature correcting temperature-sensitive member provided inside the housing. The gist of the invention is to regulate the amount of the viscous fluid introduced between the rotor and the housing.

According to the above configuration, the amount of the viscous fluid introduced between the rotor and the housing is directly metered through the temperature compensating means, so that the degree of coupling between the rotor and the housing is also reduced. The compensation can be made more directly according to the temperature sensed by the temperature compensation temperature sensing member.

According to a third aspect of the present invention, in the temperature-responsive fan coupling device according to the second aspect, the temperature-sensitive member provided outside the housing and the temperature-correcting temperature-sensitive member provided inside the housing are provided. The viscous fluid introduced between the rotor and the housing is formed of first and second bimetals, and the amount of the viscous fluid introduced is adjusted based on the sum of the temperature-sensitive deformations of the first and second bimetals. The gist is to be quantified.

According to the above configuration, a plurality of thermal deformations caused by the first and second bimetals can be reflected, so that the amount of the viscous fluid introduced can be adjusted with a higher degree of freedom. Become. In particular, by making the amount of temperature-sensitive deformation of the second bimetal act in a negative direction with respect to the direction of temperature-sensitive deformation of the first bimetal, it is possible to appropriately compensate for the above-mentioned influence of the housing temperature on the ambient temperature. become able to.

According to a fourth aspect of the present invention, in the temperature-responsive fan coupling device according to the second aspect, the temperature-sensitive member provided outside the housing is made of a first bimetal, and is provided between the rotor and the housing. The amount of the viscous fluid introduced into the first bimetal is measured based on the amount of temperature-sensitive deformation of the first bimetal, and the temperature correction temperature-sensitive member provided inside the housing is made of a second bimetal. The gist of the temperature compensating means is to reduce the temperature-sensitive deformation amount of the first bimetal based on the temperature-sensitive deformation amount of the second bimetal.

According to the above configuration, the amount of the temperature-sensitive deformation of the first bimetal affected by the temperature rise of the housing is reduced by the amount of the temperature-sensitive deformation of the second bimetal in the negative direction. Is done. For this reason, the temperature-sensitive deformation amount of the first bimetal whose weight loss has been corrected accurately reflects the temperature outside the housing by compensating for the effect of the temperature rise of the housing. It becomes possible to appropriately adjust the amount of the viscous fluid introduced into the device.

The invention according to claim 5 is the invention according to claim 3 or 4.
In the temperature-responsive fan coupling device described above, the housing has a driving force transmission chamber for coupling the rotor and the housing therein and the viscous fluid stored therein by a partition plate that rotates integrally with the housing. The partition plate is provided with an introduction hole for introducing the viscous fluid stored in the storage chamber into the driving force transmission chamber and a viscous fluid introduced into the driving force transmission chamber. A return hole for returning to the storage chamber based on centrifugal force caused by rotation of the housing, wherein the first and second bimetals determine the opening degree of the introduction hole based on the amount of thermal deformation thereof. The gist is to make adjustments.

According to the above configuration, the opening of the introduction hole can be adjusted according to the amount of temperature-sensitive deformation of each of the bimetals. Therefore, the amount of the viscous fluid introduced between the rotor and the housing can be adjusted. Can be measured more accurately.

According to a sixth aspect of the present invention, in the temperature-responsive fan coupling device according to the first aspect, the drive shaft is connected to an output shaft of a vehicle-mounted internal combustion engine.
The fan is a fan that assists a heat exchange function of a device that exchanges heat of a cooling medium of the internal combustion engine, and a temperature sensed by a temperature sensing member provided outside the housing exchanges the heat of the cooling medium. The gist is that the temperature is in the vicinity of the device.

According to the above configuration, as a temperature-responsive fan coupling device used for a cooling fan of an internal combustion engine, a more precise temperature control based on a temperature (ambient temperature) near a heat exchanger such as a radiator is provided. Will be realized.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which a temperature-responsive fan coupling device according to the present invention is applied to a fan for drawing cooling air into a radiator of a vehicle-mounted internal combustion engine will be described with reference to FIGS. I will explain using.

As shown in FIG. 1, for example, this temperature-responsive fan coupling device includes a drive shaft 51 which is drivingly connected to a crankshaft (not shown) of an internal combustion engine, and a drive shaft 51 which is fixed to the tip of the drive shaft. A rotor 52 that rotates integrally,
A housing 54 enclosing the rotor 52 and supported by the drive shaft 51 by a bearing 53 is provided.

A plurality of blades (not shown) are provided on the outer periphery of the housing 54. The housing 54, which has received a driving force from the drive shaft 51, rotates with these blades to function as a cooling fan. On the other hand, a partition plate 55 fixed to the housing 54 and rotated integrally therewith is provided inside the housing 54. The partition plate 55 divides the interior of the housing 54 into two spaces, a storage chamber 56 for storing a viscous fluid described below and a driving force transmission chamber 57. The rotor 52 formed in a disk shape is accommodated in the driving force transmission chamber 57, and a plurality of concentric rings 71 are projected from both surfaces of the outer edge of the rotor 52. These rings 71 have a comb-shaped cross section in the radial direction, and portions of the housing 54 and the partition plate 55 facing the rings 71 correspond to the concave-convex shape of the rings 71. The labyrinth groove 58 is provided to form the driving force transmission unit 70. A predetermined amount of a viscous fluid such as silicone oil is sealed in the housing 54 as hydraulic oil, and the hydraulic oil is introduced into the driving force transmission unit 70. In the driving force transmission unit 70, the driving force transmission capability from the rotor 52 to the housing 54, that is, the transmission torque, is adjusted according to the amount of the hydraulic oil introduced.

The hydraulic oil sealed in the housing 54 is supplied to the return hole 59 and the introduction hole 6 provided in the partition plate 55.
0 allows communication between the storage chamber 56 and the driving force transmission chamber 57. The return hole 59 is provided on the outer edge of the partition plate 55 and serves as a communication path from the driving force transmission chamber 57 to the storage chamber 56. When the rotor 52 rotates, the hydraulic oil is removed from the driving force transmission chamber 57 by the centrifugal force. It is configured to flow to the storage chamber 56 through 59. On the other hand, the introduction hole 60 is provided on the inner periphery than the labyrinth groove 58 of the partition plate 55, and the communication thereof is adjusted by the opening degree of the rotary valve 61 which is a valve disposed in the storage chamber 56. .

Here, the operation of the rotary valve 61 in the temperature-responsive fan coupling device will be described with reference to FIG. FIG. 2 is a front view showing the present fan coupling device viewed from the direction A in FIG. 1 focusing only on a portion related to the rotational displacement of the rotary valve 61.

First, the spiral bimetal 62 attached to the outside of the housing 54 (FIG. 1) is deformed in accordance with the sensed ambient temperature, and a shaft 73 supported by the housing 54 by a bearing 72 (FIG. 1). To +
Rotate in X direction. The other end of the shaft 73 is connected to a plate-shaped bimetal 21 for temperature correction inside the housing 54, and the rotational displacement is controlled by the bimetal 21.
Is transmitted to On the other hand, the bimetal 21
4 Deforms in response to the temperature inside. Since the rotary valve 61 is supported by the shaft 73 by the bearing 22 (FIG. 1) and is fixed to the bimetal 21 by the fixing member 23, the rotary valve 61 is rotated integrally with the bimetal 21. That is, the turning angle of the turning valve 61 is determined by the turning displacement of the bimetal 62 that senses the ambient temperature provided outside the housing 54 and the turning angle of the bimetal 21 that senses the temperature of the housing provided inside the housing 54. It is determined in consideration of the displacement. Here, the bimetal 21 is attached so as to be displaced in the direction opposite to the turning direction in which the bimetal 62 is displaced, that is, in the −X direction. In addition, the rotation angle is set so as to appropriately compensate for the effect of the temperature rise of the housing 54 on the bimetal 62 due to heat conduction and radiation.

FIG. 3 shows that in this fan coupling device, the opening degree of the introduction hole 60 by the rotary valve 61 is three stages, namely, “Off (closed)”, “Mid (half open)”,
FIG. 10 is an explanatory diagram showing an operation when the state is changed to “Hi (fully opened)”. In FIG. 3, the horizontal axis indicates the ambient temperature of the bimetal 62, and the vertical axis indicates the rotation angle of each member. The housing 54, ie, the fan, is stopped when the rotation angle of the rotation valve 61 is in the “Off” position area, rotates at a high speed when the rotation valve 61 is in the “Hi” position area, and is in the “Mid” position. When it is in the region, it rotates at an intermediate speed. As shown in FIG. 2, the three degrees of opening are provided on the partition plate 55.
It is obtained by changing the relative position between the two introduction holes 60 and the rotary valve 61. Note that FIG. 2 shows a state in which the opening of the introduction hole 60 by the rotary valve 61 is at the “Mid” position.

First, the bimetal 6 for sensing the ambient temperature
2 deforms at an angle reflecting the ambient temperature and the effect exerted by the temperature of the housing 54,
1 is rotationally displaced in the + X direction (curve C1). Here, the temperature of the housing 54 changes in three stages according to the three stages of rotation speed. When the opening of the introduction hole 60 is at the “Off” position, the fan does not rotate, and the temperature rise of the housing 54 is zero. On the other hand, the bimetal 21 that senses the temperature of the housing is deformed at an angle that reflects the three-stage temperature rise, and this is added to the rotational displacement received from the bimetal 62 to rotate the rotary valve 61. (Curve C2). As described above, the bimetal 21 is rotated and displaced in the direction (−X direction) opposite to the direction of rotation of the bimetal 62, and the angle of rotation is determined by the temperature of the housing 54. It is set to be equal to the affected. Thus, the rotating valve 61 has the bimetal 62 and the bimetal 2
Thus, a rotation angle reflecting only the ambient temperature, that is, the sum of the rotation displacements of the first rotation displacement is given (curve C3).

As described above, the rotation valve 61 is provided with a rotation angle that accurately reflects the ambient temperature, and an appropriate amount of hydraulic oil is introduced from the storage chamber 56 into the driving force transmission chamber 57 depending on the opening degree. Further, a driving force is transmitted from the rotor 52 to the housing 54 in accordance with the amount of the hydraulic oil introduced. In this way, the air volume is appropriately adjusted depending on the ambient temperature, and the temperature of the internal combustion engine can be accurately controlled.

As described above, according to the temperature-responsive fan coupling device of the present embodiment, the following excellent effects can be obtained. (1) In addition to the bimetal 62 that senses the ambient temperature,
The bimetal 21 for sensing the temperature of the housing 54 is provided. By setting the rotation angle of the bimetal 21 so as to compensate for the influence of the housing 54 on the sensing of the ambient temperature of the bimetal 62, the rotating valve 61 is given a rotational displacement that accurately reflects only the ambient temperature. Will be able to

(2) Therefore, the amount of the viscous fluid introduced from the storage chamber 56 for driving the fan to the driving force transmission chamber 57 can be appropriately adjusted. (3) Therefore, it is possible to appropriately adjust the rotation of the fan and draw in an appropriate amount of air to the radiator that accurately reflects the ambient temperature, so that the temperature of the internal combustion engine can be accurately controlled.

(4) In particular, it is possible to perform the slowdown or stop operation of the rotation of the fan when the temperature of the atmosphere decreases, immediately following the temperature change of the atmosphere. (5) Since the temperature of the internal combustion engine can be accurately controlled, the internal combustion engine can be maintained at an optimum temperature without overcooling.

(6) Further, it is possible to prevent generation of noise and deterioration of fuel efficiency due to unnecessary rotation of the fan. The above embodiment may be modified and implemented as follows.

In the above embodiment, the housing 5
The structure 4 is supported on the drive shaft 51, but is not limited to this. The housing may be attached to the fan attachment frame, for example. In short, it is only necessary that the housing 54 can receive the transmission of the driving force from the driving shaft 51 and can freely rotate by the driving force.

In the above embodiment, the bimetal 62 for sensing the ambient temperature has a spiral shape, and the bimetal 21 for sensing the temperature of the housing has a plate shape. However, the present invention is not necessarily limited to this. Absent. Each of the bimetals may have a spiral shape or a plate shape. Further, the rotary valve 61
The bimetal of any shape may be used as long as it can be rotated appropriately.

In the above embodiment, the bimetal 62 for sensing the ambient temperature is corrected by correcting the rotation angle of the rotation valve 61 based on the amount of temperature-sensitive deformation of the bimetal 21 for sensing the temperature of the housing 54. Although the example of compensating for the influence exerted by the housing 54 has been described, the invention is not necessarily limited to this. For example, the temperature sensed by the bimetal 62 may be changed so that the amount of deformation of the bimetal 62 is such that the above effect is compensated.

In the above embodiment, an example in which a bimetal is used as a temperature sensing member has been described, but the invention is not necessarily limited to this. The two temperature sensing members accurately sense the temperature, and the housing 54 is a bimetal 6
Any member can be used as long as it can surely compensate for the influence on the ambient temperature sensing of 2, and can directly or indirectly apply the rotational displacement to the rotational valve 61. Also, the mounting position of the temperature sensing member for sensing the ambient temperature need not necessarily be mounted on the housing 54. For example, the temperature of the cooling medium of the internal combustion engine may be sensed, and the turning angle of the turning valve 61 may be adjusted based on the temperature.

In the above embodiment, the opening degree of the introduction hole 60 by the rotary valve 61 is set to “Off”, “Mi”
Although the description has been made in the example of three stages of “d” and “Hi”, the present invention is not necessarily limited to this. The degree of opening of the rotary valve 61 may be two or four or more. Further, it may be one that can be adjusted steplessly.

In the above-described embodiment, the capacity of the viscous fluid for rotating the fan through the driving force transmitting unit 70 is determined by the opening of the introduction hole 60 provided in the partition plate 55. Although an example in which adjustment and change are performed according to the above has been described, the present invention is not necessarily limited to this. The valve for adjusting the introduction amount of the viscous fluid does not need to depend on a valve that opens and closes the valve by rotational displacement. Further, the valve structure may not be provided. In short, it is only necessary to adjust the volume of the viscous fluid interposed in the driving force transmission unit 70 in accordance with the temperature sensed by the temperature sensing member.

In the above embodiment, the rotor 52
Although the labyrinth portion is formed by the outer peripheral portion and the portions of the housing 54 and the partition plate 55 opposed to each other, and the driving force is transmitted by viscous fluid introduced into the labyrinth portion, the labyrinth portion is not necessarily required. is not. In other words, as long as the transmission of the driving force and the adjustment of the transmission of the driving force so as to sense the rise in the temperature of the housing 54 and compensate for the influence thereof can be reliably performed, It may be a shape.

In the above embodiment, the drive shaft 51
Although the example in which the driving force is obtained from the internal combustion engine has been described, the present invention is not necessarily limited to this. The drive shaft 51 is
It may be connected to any drive source as long as the drive force is reliably obtained.

In the above embodiment, the case where this fan coupling device is used as a fan for drawing cooling air into a radiator of an internal combustion engine mounted on a vehicle has been described as an example, but is not necessarily limited to this. Not something. The present invention can be widely applied to any fan as long as the temperature is sensed by each temperature-sensing member and the rotation of the fan is adjusted based on the temperature, and it may not be a cooling fan for the internal combustion engine. It does not need to be mounted on the vehicle.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration example of a temperature-responsive fan coupling device according to an embodiment of the present invention.

FIG. 2 is a front view showing the same embodiment, focusing only on a portion related to the rotation displacement of the rotation valve.

FIG. 3 is an explanatory diagram showing an example of a relationship between an ambient temperature and a rotation angle of each member in the embodiment.

FIG. 4 is a cross-sectional view showing a structural example of a conventional temperature-responsive fan coupling device.

FIG. 5 is an explanatory diagram showing an example of a relationship between an ambient temperature and a rotation angle of a rotation valve in a conventional temperature-responsive fan coupling device.

[Explanation of symbols]

Reference numeral 21: bimetal, 22: bearing, 23: fixing member, 51: drive shaft, 52: rotor, 53: bearing,
54 ... housing, 55 ... partition plate, 56 ... storage room, 57
... driving force transmission chamber, 58 ... labyrinth groove, 59 ... return hole,
Reference numeral 60: introduction hole, 61: rotating valve, 62: bimetal,
Reference numeral 70 denotes a driving force transmission unit, 72 denotes a bearing, and 73 denotes a shaft.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tamotsu Kawai 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Kan Fukuda 1 Toyota Town Toyota City, Aichi Prefecture Toyota Motor Corporation ( 72) Inventor Tetsuro Otani 1st Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (6)

[Claims] A rotor connected to a drive shaft and a housing surrounding the rotor, wherein a viscous force is applied between the rotor and the housing in accordance with a temperature sensed by a temperature sensing member provided outside the housing. A temperature-responsive fan in which a fluid is introduced, the rotor and the housing are coupled based on the shearing force of the introduced viscous fluid, and a fan provided in the housing is rotated as the drive shaft rotates. The temperature-responsive fan coupling device, further comprising a temperature compensating means for compensating a temperature sensed by the temperature-sensitive member according to a temperature of the housing. 2. The apparatus according to claim 1, wherein said temperature compensating means has a temperature-correcting temperature-sensitive member provided inside said housing and measures an amount of a viscous fluid introduced between said rotor and said housing. The temperature-responsive fan coupling device according to claim 1, wherein 3. A temperature sensing member provided outside said housing and a temperature sensing temperature sensing member provided inside said housing are respectively made of first and second bimetals.
3. The temperature-responsive fan according to claim 2, wherein the amount of the viscous fluid introduced between the rotor and the housing is measured based on the sum of the temperature-sensitive deformations of the first and second bimetals. Coupling device. 4. A temperature-sensitive member provided outside the housing is made of a first bimetal, and a viscous fluid introduced between the rotor and the housing is based on a temperature-sensitive deformation amount of the first bimetal. The temperature of the temperature compensation member provided inside the housing is made of a second bimetal, and the temperature compensating means is provided based on the amount of temperature-sensitive deformation of the second bimetal. 3. The temperature-responsive fan coupling device according to claim 2, wherein the temperature-dependent deformation amount of the first bimetal is reduced and corrected. 5. The housing is partitioned into a driving force transmission chamber for coupling the rotor and the housing and a storage chamber for storing the viscous fluid by a partition plate that rotates integrally with the housing. And the partition plate is provided with an introduction hole for introducing the viscous fluid stored in the storage chamber into the driving force transmission chamber and a viscous fluid introduced into the driving force transmission chamber as the housing rotates. And a return hole for returning to the storage chamber based on centrifugal force, wherein the first and second bimetals are
The temperature-responsive fan coupling device according to claim 3, wherein an opening degree of the introduction hole is adjusted based on a temperature-sensitive deformation amount. 6. The temperature-responsive fan coupling device according to claim 1, wherein said drive shaft is connected to an output shaft of a vehicle-mounted internal combustion engine, and said fan controls a cooling medium of said internal combustion engine. A fan that assists the heat exchange function of the device that exchanges heat, wherein the temperature sensed by a temperature-sensitive member provided outside the housing is a temperature near the device that exchanges heat with the cooling medium. Temperature sensitive fan coupling device.