JP2922031B2 - Automotive cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an automobile, and more particularly to an improvement of a viscous fluid coupling constituting the cooling device for an automobile.

[0002]

2. Description of the Related Art As a prior art of a cooling device for an automobile, there is one disclosed in, for example, Japanese Utility Model Laid-Open Publication No. Sho 62-114223.

[0003] This prior art will be described with reference to FIG. 10. Referring to FIG.
The zero input member 71 is indirectly connected to an output shaft of an automobile engine or the like (not shown), and an output member 73 having a cooling fan 72 fixed on the outer peripheral portion is rotatably supported via a bearing 74.

The output member 73 is composed of a housing 73a and a cover 73b, and an internal space 75 thereof is partitioned by a partition member 76 into an operating space 77 and a storage space 78.
A plurality of first communication holes 79 communicating the working space 77 and the storage space 78 are formed in the partition member 76, and the first communication holes 79 can be opened and closed by opening and closing members 80.
Here, the opening / closing member 80 is driven by a bimetal 82 via a rod 81. Note that an appropriate amount of viscous fluid is sealed in the internal space 75.

The transmission member 83 is fixed to one end of the input member 71 and is located inside the working space 77. A transmission mechanism (in general, a labyrinth mechanism is used) between one inner side of the housing 73a and one side of the transmission member 83.
84 are formed. Here, torque is transmitted from the input member 71 to the output member 73 via the transmission mechanism 84 and the viscous fluid. The transmission member 83 is formed with a plurality of second communication holes 85 which are opposed to the first communication holes 79 and communicate with each other. The second communication holes 85 are controlled to be opened and closed by opening and closing means 86 described later.

A recovery passage 87 is formed in the cover 73b so that the viscous fluid in the working chamber 77 can be recovered into the storage chamber 78.

As shown in FIG. 11, a fan-shaped valve member 88 is rotatably supported on a shaft 89 by a transmission member 83 to open and close the second communication hole 85. A magnet 90 is provided on the side of the valve member 88, and a magnet 91 is also provided on the rotation line of the magnet 90 of the transmission member 83. The magnets 90 and 91 are arranged with their polarities determined so as to repel each other.

The viscous fluid coupling 70 is disposed, for example, between an output shaft of a water-cooled automobile engine (not shown) (not shown) and a cooling fan 72, and is disposed downstream of a radiator (not shown) of the engine. Here, when the engine is cold, the temperature of the air passing through the radiator is low and the bimetal 8
2 urges the opening / closing member 80 in a direction to close the first communication hole 79. Therefore, the viscous fluid in the working chamber 77 is collected by the recovery passage 87.
The cooling fan 72 is rotated at a low speed by virtue of the viscous fluid slightly recovered in the working chamber 77 via the storage chamber 78 via the storage chamber 78. At this time, the opening / closing means 86 is opened / closed according to the rotation speed of the input member 71, but does not affect the rotation speed of the cooling fan 72 when the engine is cold.

Next, when the engine temperature rises, the radiator passing air temperature rises, and the bimetal 82 urges the opening / closing member 80 in the direction in which the first communication hole 79 opens. Therefore,
The viscous fluid in the working chamber 77 is recovered to the storage chamber 78 via the recovery passage 87, and the viscous fluid in the storage chamber 78 is supplied to the working chamber 77 via the first communication hole 79 at the same time. The viscous fluid circulates between the working chamber 77 and the storage chamber 78.

Here, in the opening / closing means 86, the magnet 9
The valve member 88 is urged in the direction to close the second communication hole 85 by the repulsive force between 0 and 91. Therefore, in a region where the rotation speed of the input member 71 is low, the viscous fluid supplied from the first communication hole 79 into the working chamber 77 is not supplied to the transmission mechanism 84. However, in the region where the rotation speed of the input member 71 is low, the rotation speed of the cooling fan 72 is the same regardless of the amount of the viscous fluid in the transmission mechanism 84, so that the radiator is operated regardless of the open / close state of the opening / closing means 86. There is no difference in the amount of air passing.

On the other hand, in a region where the rotation speed of the input member 71 is high, as shown in FIG. 12, the centrifugal force acting on the valve member 88 overcomes the repulsive force between the magnets 90 and 91, so that the valve member 88 The communication hole 85 is opened, and the viscous fluid supplied from the first communication hole 79 into the working chamber 77 is supplied to the transmission mechanism 84. Accordingly, the rotation torque of the input member 71 is transmitted to the output member 73 via the viscous fluid and the transmission mechanism 84, and the cooling fan 72 rotates according to the rotation speed of the input member 71. The valve member 88 opens and closes the second communication hole 85 when the engine speed is, for example, about 1200 rpm.

FIG. 13 is a characteristic diagram showing the relationship between the number of rotations between the input and output members 71 and 73 of the viscous fluid coupling 70.

[0013]

By the way, when a car travels in an urban area or the like, acceleration and deceleration are frequently performed.
The engine output speed moves up and down. Therefore, the input member 7
Similarly, the number of rotations of 1 also frequently moves up and down, and the opening and closing means 86 also frequently opens and closes the second communication hole 85. Here, when the radiator passing air temperature is sufficiently high, the first communication hole 79 remains open, so that the supply of the viscous fluid to the transmission mechanism 84 is interrupted as the second communication hole 85 is repeatedly opened and closed. The rotation speed of the output member 73 also moves up and down. This is shown in FIG.

Therefore, as can be seen from FIG. 14, when the vehicle using the viscous fluid coupling 70 of the prior art travels in an urban area, the engine speed frequently fluctuates up and down as described above.
Since the rotation speed of the cooling fan 72 fixed to the output member 73 follows the vertical movement of the engine rotation speed, there is a problem that the noise is felt to be very troublesome.

Therefore, in the present invention, it is an object of the present invention to reduce fan noise in a vehicle cooling system.

[0016]

Configuration of the Invention

[0017]

Means for Solving the Problems The technical means of the present invention taken to solve the technical problem of the present invention include an engine, a radiator for cooling engine cooling water,
An input member connected to an output shaft of an engine in a vehicle cooling device having a cooling fan disposed between an engine and a radiator, and a viscous fluid coupling connecting an output shaft of the engine and the cooling fan, An output member rotatably supported by the member via a bearing means, and a cooling fan fixed to an outer peripheral portion; a partition member for partitioning an internal space of the output member into an operating space and a storage space; and a partition member. At least one first communication hole, opening and closing means for opening and closing the first communication hole, a viscous fluid sealed in the internal space,
A transmission member fixed to one end of the input member and arranged in the working space, a first transmission mechanism formed between one side surface of the partition member and one side surface of the transmission member, and another side surface of the transmission member A second transmission mechanism formed between the first member and the output member; a pump means disposed on an outer peripheral portion of the partition member; and a second member formed on the transmission member and facing the first communication hole and communicating with each other. A viscous fluid coupling is formed from the communication hole, and the second communication hole is a valve member disposed in a valve accommodating portion formed inside the transmission member, and a spring for urging the valve member in a direction in which the second communication hole is closed. The opening and closing are controlled by the means, and a liquid-tight gap is formed between the valve accommodating portion and the valve member so that the viscous resistance of the viscous fluid attached to the liquid-tight gap acts when the valve member moves. , The second communication hole is when the input member rotates at high speed It is in the can open.

[0018]

According to the above technical means of the present invention, in the viscous fluid coupling, when the rotation speed of the input member fluctuates, the valve member that opens and closes the second communication hole according to the rotation speed of the input member is viscous. Due to the viscous resistance of the fluid, the followability of the movement of the valve member to the fluctuation of the rotation speed of the input member is poor. Therefore, the rotation speed of the output member is hardly affected by the fluctuation of the rotation speed of the input member.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the technical means of the present invention will be described below with reference to the accompanying drawings.

In the vehicle cooling apparatus 10 according to the first embodiment of the present invention shown in FIG.
A cooling fan 13 is disposed between the cooling fan 13 and a radiator 12 for cooling the cooling water of the engine 11, and an output shaft (not shown) of the engine 11 and the cooling fan 13 are connected via a viscous fluid coupling 14.

In the viscous fluid coupling 14 shown in FIG. 2, an input member 15 indirectly connected to the output shaft of the engine 11 is provided.
An output member 18 composed of a cover 16 and a case 17 is rotatably supported via a bearing (support means) 19. Note that the cover 16 and the case 17 are integrally formed by an appropriate number of bolts 20, and a cooling fan 13 is fixed to an outer peripheral portion thereof by an appropriate number of bolts 21. A seal member 22 is provided between the cover 16 and the case 17.
Are arranged.

An appropriate amount of viscous fluid (for example, silicone oil) is sealed in the internal space 23 of the output member 18, and the internal space 23 is divided into a working space 26 and a partitioning member 24 fixed to the output member 18. And storage space 27, 28
It is divided into and. A plurality of first communication holes (one illustrated) 29 are formed in the partition member 24 to communicate the working space 26 and the storage space 27.

The first communication hole 29 is opened and closed by a valve member 30. One end of a rod 31 is fixed to the center of rotation of the valve member 30. The rod 31 is rotatably supported by the cover 16 via a bearing 32, and a center end of a temperature sensing member (for example, a spiral bimetal) 33 is fixed to the other end. The outer peripheral end of the temperature sensing member 33 is fixed to the cover 16. And
These valve member 30, rod 31, and temperature sensing member 27
Constitutes the opening / closing means 34.

A rotor (transmission member) 35 fixed to one end of the input member 15 is provided in the working space 26. The rotor 35 has a second communication hole which is opposed to the first communication hole 29 and communicates with each other. A hole 36 is drilled. Second communication hole 36
Is opened and closed by a valve member 37. The valve member 37 is a valve housing 3 formed inside the rotor 35.
The second communication hole 36 is slidably accommodated in the inside 8 and is urged by a spring (spring means) 39 in a direction in which the second communication hole 36 is closed. Here, the valve member 37 and the valve housing portion 38
And a liquid-tight gap is formed between the valve member 37 and the valve member 37.
The viscous resistance of the viscous fluid adhering to the liquid-tight gap acts when the air moves.

The pump means 40 disposed between the working space 26 and the storage space 28 is provided integrally with a pump hole 41 formed in the outer peripheral portion of the partition member 24 and the partition member 24 and in the rotational direction of the rotor 35. Is formed by a pump projection 42 formed on the downstream side of the pump hole 41 in FIG. A helical spline 43 is formed on the outer peripheral surface of the rotor 35.

An auxiliary pump means 44 is disposed between the working space 26 and the storage space 28, and the auxiliary partition member 25
Hole 45 and auxiliary partition member 2 formed in the outer peripheral portion of
5 and a pump projection 46 formed on the upstream side of the pump hole 45 in the rotation direction of the rotor 35.

A first transmission mechanism 48 is constituted by a gap between the right side surface of the partition member 24 in the figure and the locking member 47 fixed to the left side surface of the rotor 35 in the figure. Here, the locking member 47 is fixed to the rotor 35 after the arrangement of the valve member 37 and the like on the rotor 35 is completed.

On the other hand, the labyrinth groove 49 formed between the right side surface of the rotor 35 in the figure and the left side surface of the auxiliary partition member 25 fixed to the case 17 of the output member 18 forms the second part.
The transmission mechanism 50 is configured.

The automobile cooling device 10 having the above-described configuration.
The operation of is described below.

When the engine 11 is started, the input member 15 and the rotor 35 rotate accordingly. At this time,
The viscous fluid in the storage space 28 is discharged to the working space 26 by the action of the auxiliary pump means 44, and the viscous fluid in the working space 26 is transferred to the storage space 27 by the action of the helical spline 43 and the pump means 40. Most are recovered.

At this time, the engine 11 is not sufficiently warm and its water temperature is low. Therefore, since the temperature of the air passing through the radiator 12 is low, the valve member 30 is connected to the first communication hole 29 by the action of the temperature sensing member 33 which senses the air temperature.
To close. However, since the viscous fluid has not completely disappeared in the working space 26, the OF shown in FIG.
The input rotation speed of the input member 15 is transmitted to the output member 18 in a relationship as in the case of F, and the fan 1 fixed to the output member 18 is connected.
3 is rotated at low speed.

When the temperature of the cooling water rises when the engine 11 warms up, the temperature of the air passing through the radiator 12 also rises, and the valve member 30 opens the first communication hole 29 by the action of the temperature sensing member 33. Here, when the rotation speed of the input member 15 is lower than a certain set value, the urging force of the spring 39 is larger than the centrifugal force applied to the valve member 37 as shown in FIGS. The member 37 is the second
The communication hole 36 remains closed. Then, the storage space 21
The viscous fluid therein is supplied only to the first transmission mechanism 48 in the working space 26 via the first communication hole 29. Accordingly, the rotation of the rotor 35 is transmitted to the output member 18 via the partition member 24 via the viscous fluid existing in the first transmission mechanism 48. At this time, the input rotation speed of the input member 15 is transmitted to the output member 18 in a relation similar to the case of the Mid shown in FIG.
The viscous fluid flowing into the first transmission mechanism 48 flows to the outermost peripheral portion in the working space 26 by centrifugal force, and is collected in the storage space 27 by the action of the pump means 40.
That is, the viscous fluid flows from the storage space 27 to the first communication hole 29 to the first communication hole 29.
There is a reflux from the transmission mechanism 48 to the pump means 40 to the storage space 27.

On the other hand, if the rotation speed of the input member 15 becomes higher than the above-mentioned set value in a state where the first communication hole 29 is opened, the centrifugal force applied to the valve member 37 as shown in FIGS. When the force is greater than the urging force of the spring 39, the valve member 37 opens the second communication hole 36. Then, the viscous fluid in the storage space 21 passes through the first communication hole 29 and the first and second transmission mechanisms 4 in the working space 26.
8 and 50. Accordingly, the rotation of the rotor 35 is transmitted to the output member 18 via the partition member 24 and the auxiliary partition member 25 via the viscous fluid present in the first and second transmission mechanisms 48 and 50. At this time, H shown in FIG.
The input rotation speed of the input member 15 is transmitted to the output member 18 in such a relationship as at time i. The first and second transmission mechanisms 48, 5
The viscous fluid that has flowed into 0 flows to the outermost peripheral portion in the working space 26 by centrifugal force, and is collected in the storage space 27 by the action of the pump means 40. That is, the viscous fluid is stored in the storage space 27, the first communication hole 29, the first transmission mechanism 48, the pump means 40, the storage space 27 and the storage space 27, the first communication hole 29, the second communication hole 36, and the second transmission mechanism 50.ポ ン プ Pump means 40 貯 蔵 Refluxes with the storage space 27.

When the automobile 51 travels in an urban area or the like, acceleration and deceleration are frequently performed, and the output speed of the engine 11 moves up and down. Similarly, the rotation speed of the input member 15 frequently moves up and down. At this time, since the aforementioned viscous resistance is applied to the valve member 37, the valve member 37 does not immediately open the second communication hole 36 even if the rotation speed of the input member 15 increases, The rotation speed opens slightly later than the rise. Therefore, as shown in FIG. 8, the rotation speed fluctuation of the output member 18 is not directly affected by the rotation speed fluctuation of the input member 15, and even if the rotation speed of the input member 15 frequently moves up and down frequently, The degree of up and down movement of numbers is small.

Next, FIG. 9 shows a main part of a vehicle cooling device 55 according to a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. I do. An orifice 57 is formed in the valve member 56 so as to penetrate the valve member 56 in parallel with the moving direction. The orifice 57 reduces the pressure in the space in which the spring 39 is accommodated when the valve member 37 moves,
This is to make the same as the inside, so that unnecessary force does not act on the movement of the valve member 37. Other operations are the same as those of the first embodiment, and the description is omitted.

[0036]

As described above, according to the present invention, when the rotation speed of the input member of the viscous fluid coupling fluctuates, the valve member that opens and closes the second communication hole according to the rotation speed of the input member is a valve. The viscous fluid present in the liquid-tight gap between the member and the valve housing receives the viscous resistance of the viscous fluid. Therefore, the rotation speed of the output member is hardly affected by the fluctuation of the rotation speed of the input member. Even when the engine rotation speed (the rotation speed of the input member) frequently moves up and down when the automobile travels in a city area, the fan speed increases. The degree of vertical movement of the rotation speed (the rotation speed of the output member) is small. As a result, noise due to fluctuations in the fan speed is suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle cooling device 10 according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the viscous fluid coupling 14 in FIG.

FIG. 3 is an enlarged sectional view of a main part in a low-speed rotation region in FIG. 2;

FIG. 4 is an enlarged front view of a main part in a low-speed rotation range in FIG. 2;

FIG. 5 is an enlarged sectional view of a main part in a high-speed rotation region in FIG. 2;

FIG. 6 is an enlarged front view of a main part in a high-speed rotation range in FIG. 2;

FIG. 7 shows an operation characteristic diagram (1) in FIG.

FIG. 8 shows an operation characteristic diagram (2) in FIG.

FIG. 9 is an enlarged sectional view of a main part of a vehicle cooling device according to a second embodiment of the present invention.

FIG. 10 shows a cross-sectional view of a prior art viscous fluid coupling 70.

FIG. 11 is a front view of a main part when the second communication hole in FIG. 10 is closed.

FIG. 12 is a front view of the main part when the second communication hole in FIG. 10 is opened.

FIG. 13 shows an operation characteristic diagram (1) in FIG.

FIG. 14 shows an operation characteristic diagram (2) in FIG.

[Explanation of symbols]

 Reference Signs List 10 automobile cooling device, 11 engine, 12 radiator, 13 cooling fan, 14 viscous fluid coupling, 15 input member, 18 output member, 19 bearing (support means), 23 internal space, 24 partition member, 26 working space, 27, 28 storage space, 29 first communication hole, 34 opening / closing means, 35 rotor (transmission member), 36 second communication hole, 37 valve member, 38 valve housing part, 39 spring (spring means), 40 pump means, 48 first Transmission mechanism, 50 second transmission mechanism, 57 orifice.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 51-50170 (JP, U) JP-A 1-1102526 (JP, U) JP-A 62-114223 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) F16D 35/02 F01P 7/08

Claims (2)

(57) [Claims] An engine; a radiator for cooling a cooling water of the engine; a cooling fan disposed between the engine and the radiator; and a viscous fluid connecting an output shaft of the engine and the cooling fan. A viscous fluid coupling comprising: an input member connected to an output shaft of the engine; and an input member rotatably supported by the input member via a support means. An output member fixed to the partition member; a partition member that partitions an internal space of the output member into an operating space and a storage space; at least one first communication hole formed in the partition member; and the first communication hole. Opening / closing means for opening / closing, a viscous fluid sealed in the internal space, a transmission member fixed to one end of the input member and arranged in the working space, and one side of the partition member A first transmission mechanism formed between a surface and one side surface of the transmission member; a second transmission mechanism formed between the other side surface of the transmission member and the output member; and an outer peripheral portion of the partition member And a second communication hole formed in the transmission member and facing the first communication hole and communicating with each other. The second communication hole is formed inside the transmission member. Opening and closing are controlled by a valve member disposed in the valve housing portion and a spring means for urging the valve member in a direction in which the second communication hole is closed, between the valve housing portion and the valve member. A liquid-tight gap is formed in the valve member so that the viscous resistance of the viscous fluid attached to the liquid-tight gap acts when the valve member moves, and the second communication hole is provided when the input member rotates at a high speed. Automotive cold characterized by opening Apparatus. 2. An automobile cooling device according to claim 1, wherein an orifice penetrating through said valve member is formed inside said valve member in parallel with a moving direction of said valve member.