JPS6179032A - Viscous fluid coupling device - Google Patents

Abstract

PURPOSE:To supply the required quantity of cooling gas by turning a valve plate according to a radiator passing air temperature to control the opening and closing of the first return hole and axially moving the valve plate according to temperature of the water in a pump to control the opening and closing of the second return hole. CONSTITUTION:When a radiator passing air temperature reaches a designated value, a valve plate 31 interlocking with a bimetal 29 opens the first return hole 23. Then, viscous fluid is supplied to a torque transmission surface 22 to keep the rotation of a fan at the medium speed. When the temperature of the cooling water in a water pump 38 reaches a designated temperature, a rod 47 interlocking with a thermostat 46 is moved, whereby the valve plate 33 is moved to open the second return hole 24 to increase the rotating speed of the fan. Thus, the required quantity of gas according to a caloritic value of an engine can be supplied with good accuracy.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a viscous fluid coupling device, and more specifically, to a temperature-sensitive viscous fluid coupling device capable of controlling output torque transmission in three stages in response to temperature. This relates to a sensitive viscous fluid coupling device and is generally used as a cooling fan device for automobile engines.

(Prior art) As a prior art related to the present invention, Japanese Patent Application Laid-Open No. 55-69326
The one described in the publication No. 1 is known. As shown in the attached FIGS. 5 and 6, a casing 53 is rotatably supported via a bearing 52 on a rotating shaft 51 driven by an engine. A cover 54 is fixed on the casing 53 to form an internal space, and a rotating shaft 51
A rotor 55 is further coupled to the rotor 55 . A partition plate 57 fixed to the cover 54 separates the internal space into a working chamber 58 that accommodates the rotor 55 and a storage chamber 59 that stores viscous fluid. A first torque transmission surface 56 formed of a labyrinth groove is formed on the opposing surface of the rotor 55 and the casing 53, while a second torque transmission surface 56 also formed of a labyrinth groove is formed on the opposing surface of the rotor 55 and the partition plate 57. 61 is formed. A first return hole 62 and a second return hole 60 are formed in the partition plate 57 to allow the viscous fluid to flow back from the storage chamber 59 to the working chamber 58. A spiral bimetal 65 that is activated by detecting the air temperature passing through the radiator is attached to the front surface of the cover 54, and a valve plate 67 connected to the bimetal 65 and rotating on the partition plate 57 allows the valve plate 67 to rotate on the partition plate 57. The return holes 62, 60 are controlled to open and close. That is, as shown in FIG. 6, when the temperature is low, the valve plate 67 is held at the position a where both the return holes 62 and 60 are closed, and when the temperature rises and reaches the first predetermined temperature T1, the valve plate 67 is held at the radially outer peripheral side. When the temperature rises further and reaches the second predetermined temperature T2 (however, T1 - T2), the second return hole 62 formed on the radially inner circumferential side The return hole 60 is also held at the open position C, and in this way, the torque is transmitted from the rotating shaft (input member) 51 to the casing 53 and the cover 54 (output member).
Since the rotation speed of the cooling fan attached to the output member is controlled in stages, when the temperature is lower than the first predetermined temperature T1, the rotation speed is reduced to low speed (OFF state), and when the temperature is lower than the first predetermined temperature T1 and the second predetermined temperature T2. When the temperature is medium between (MIDDLE
state), and when the temperature is higher than the second predetermined temperature T2, the rotation is controlled in three stages so that the rotation is at high speed (ON state).

(Problems to be Solved by the Invention) As described above, the conventional device detects the temperature of the air passing through the radiator using a spiral bimetal, and controls the rotation speed of the cooling fan attached to the output member to OFF, MIDDLE, ○N. It is controlled in three stages. Therefore, even though the engine water temperature does not rise and the temperature of the air passing through the radiator is low (even though the temperature corresponds to the OFF or MIDDLE state), as when the vehicle is driving in the city, the amount of air passing through the radiator is small. Since the passing wind speed is low and the air does not hit the bimetal installed on the front of the output member, the temperature in the engine room increases, and the bimetal senses this increased temperature, causing the fan to rotate at high speed (ON state). ).

Therefore, the technical problem of the present invention is to appropriately supply the required amount of cooling air according to the amount of heat generated by the engine.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
The valve plate rotates on the partition plate in conjunction with the spiral bimetal, which operates by detecting the air temperature passing through the radiator, and controls the opening and closing of the first return hole, and the water pump operates by detecting the water temperature in the greenhouse. The valve plate moves in the axial direction in conjunction with a thermostat that controls opening and closing of the second return hole.

(Operation) The above technical means operates as follows. When the temperature is lower than the first predetermined temperature, the first predetermined temperature is lower than the first predetermined temperature. the second return holes are each closed by a valve plate;
Fan rotation is maintained in the OFF state. When the first predetermined temperature is reached as the temperature rises, the bimetal detects the air temperature passing through the radiator, and the valve plate linked to the bimetal rotates on the partition plate to open the first return hole and reduce the fan rotation to M.
Hold in I D D L, E state. When the temperature further increases and reaches a second predetermined temperature, the thermostat detects the water temperature in the greenhouse of the water pump, and the valve plate linked to the thermostat moves in the axial direction to open the second return hole.
Fan rotation is maintained in the ON state. Therefore, the bimetal rotates the valve plate to open and close the first return hole and controls the fan rotation between the OFF and MIDDLE states, while the thermostat rotates the valve plate to open and close the second return hole. This is to control the rotation of the fan by switching it between the MIDDLE and ON states. Since the thermostat operates by directly sensing the temperature of the cooling water flowing into the greenhouse of the water pump, there is no possibility of a malfunction in which the fan rotation is turned on due to the ambient temperature in the engine room. In this way, MIDD of fan rotation
Since the engine cooling water temperature is directly detected by the thermostat to control switching between the LE and ON states, the required air volume according to the engine heat generation amount can be supplied with high accuracy.

(Example) An example embodying the technical means of the present invention will be described below with reference to the accompanying drawings.

The viscous fluid coupling device 10 shown in FIG. 1 has a rotating shaft 12 as an input member that receives the driving force of an engine via a pulley 11, and a casing 14 is rotatably mounted on the shaft 12 via a bearing 13. A rotor 15 is integrally connected to the left end of the shaft 12 in the drawing. A cover 16 is fixed on the casing 14 via a sealing O-ring 17 to form an internal space, and the partition plate fixed to the cover 16 creates a viscous space between the casing 14 and the cover 16. It is separated into a storage chamber 19 in which fluid is stored and an operating chamber 20 in which the rotor 15 is housed. A first torque transmission surface 21 formed from a well-known labyrinth groove is formed on the opposing surface between the rotor 15 and the casing 14, while a first torque transmission surface 21 formed from a well-known labyrinth groove is formed on the opposing surface between the rotor 15 and the cover IG. 2 torque transmission surfaces 22 are formed. Storage room 1 is located on the partition plate 18.
As a passage for circulating the viscous fluid in 9 to the working chamber 20,
A first return hole 23 is provided on the outer circumferential side in the radial direction, and a second return hole 2 is provided on the inner circumferential side.
4 are formed respectively, and the first
A passage 25 is formed in the rotor 15 so that viscous fluid can be fed to the torque transmission surface 21 . Further, a pump mechanism is formed by a notch 26 formed on the outer peripheral side of the rotor 15, a pump projection 27 formed on the outer peripheral part of the partition plate 1, and a pump hole 28. When relative rotation occurs between them, the viscous fluid in the working chamber 20 is fed to the storage chamber 19 by the action of the pump mechanism.

A /I11-wound bimetal 29 is attached to the front surface of the cover 16 and is activated by detecting the air temperature passing through the radiator. The outer end of the bimetal 29 is fixed to the cover 16, while its inner end is fixed to a rod 30 which is rotatably mounted on the cover 16.

Storage room 191j on partition plate 18! The valve plate 31 disposed in the IJ has a valve shaft 32 and a guide member 3 screwed to the shaft 32 at its axial center.
It is clamped and fixed between 3 and 3. The guide member 33
As shown in the figures and FIG. 3, the illustrated left protrusion 33a is formed on the illustrated right protrusion 30a of the rod 30.
34 is fitted. Therefore, as the rod 30 rotates, the guide member protrusion 33 fits into the groove 34 of the rod 30.
The guide member 33 is connected to the valve plate 3 by the two sides of a.
It is configured to rotate together with 1. That is, in conjunction with the bimetal 29, the valve plate 31 is connected to the partition plate 1.
8 to open and close the first return hole 23. Furthermore, the fourth
35 and 36 shown in the figure are a stopper 35 that limits rotation of the valve plate 31 and a stopper 36 that limits rotation at low temperatures.
respectively prevent rotation at high temperatures. Valve plate 3
1 is always urged in the direction of closing the second return hole 24 by a spring 37 whose one end is locked to the flange portion 30b of the rod 30. Projections 33 on two sides of guide member 33
Since a can move in the axial direction within the groove 34 of the rod 30, the valve plate 31 is moved in the axial direction by a thermostat, which will be described later, to control opening and closing of the second return hole 24.

Now, a water pump used for circulating engine cooling water has a pump body 39 fixed to a stationary part of the engine, and a rotating shaft 40 inside the body 39.
is arranged rotatably.

The rotating shaft 40 is integrally connected to the rotating shaft 12 of the viscous fluid coupling device 10 and similarly receives the driving force of the engine. An impeller portion 42 of a pump rotor 41 fixed on the shaft 40 feeds engine cooling water flowing from the radiator into a vortex chamber 43 in the body 39 to a discharge passage 44 . Drive part 4 of shaft 40 of cooling water in vortex chamber 43
Sealing to the 0a side is performed by a well-known mechanical seal 45. A thermostat 46 that is activated by detecting the temperature of the cooling water in the vortex chamber 43 is attached to the right end of the shaft 40 in the figure, and a tenth tube 4 that operates in conjunction with the thermostat 46
7 is disposed in the through hole 40b in the shaft 40 so as to be movable in the axial direction. A 20th tube 48 coupled to the 10th tube 47 is accommodated in the shaft 12 so as to be movable in the axial direction, and a seat member 48 is fixed to the left end of the 20th tube 48 in the drawing.
a, a pole 4 accommodated within the valve shaft 34;
9 makes contact.

Next, the operation of the viscous fluid coupling device having the above configuration will be explained. When the radiator passing air temperature reaches the first predetermined temperature TI
At lower temperatures, the valve plate 31 is in a position to close the first return hole 23 and the second return hole 24, respectively, as shown in FIG. 4, and the amount of viscous fluid in the working chamber 20 is minimized. The rotation of the fan attached to the cover (output member) 16 is maintained at a low speed (OFF state). Next, when the temperature rises and the air temperature passing through the radiator reaches the first predetermined temperature Tl, the valve plate 31 that is linked to the spiral bimetal 29 that detects the air temperature and operates opens the first return hole 23.
As a result, the viscous fluid is supplied from the storage chamber I9 to the second torque transmission surface 22 in the working chamber 20 through the first return hole 23,
Fan rotation is maintained at medium speed (MIDDLE state! 3). When the temperature further rises and the cooling water temperature in the vortex chamber 43 of the water pump 38 reaches a second predetermined temperature T2 (however, Tl<T2) which is higher than the above-mentioned first predetermined temperature T1, the temperature of the cooling water is changed to the thermostat 46. detects and extends in the axial direction,
The tenth rod 47 that is linked to the thermostat 46 is moved to the left in the drawing. Therefore, the 20th arm 48 connected to the 10th arm 47 similarly moves to the left in the drawing, and moves the valve plate 33 in the axial direction against the biasing force of the spring 37. That is, the valve plate 33 is the partition plate 1
8 and opens the second return hole 24, so that viscous fluid is also supplied from the storage chamber 19 through the second return hole 24 and the passage 25 passing through the rotor 15 to the first torque transmission surface 21, causing the fan to rotate. is maintained at high speed (ON state).

C Effect of the Invention] As is clear from the above explanation, the present invention directly detects the engine cooling water using the thermostat to control the switching of the fan rotation from medium speed to high speed (from MIDDLE to ON state). Therefore, it is possible to appropriately supply the necessary air volume according to the engine heat generation amount. Further, since the spiral bimetal detects the first predetermined temperature and the thermostat detects the second predetermined temperature, it is easy to set the first and second predetermined temperatures, and the spiral bimetal alone detects the first and second predetermined temperatures. Operational reliability is improved compared to conventional devices that detect the second predetermined temperature.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a viscous fluid coupling device according to the present invention, FIG. 2 is an enlarged view of part A in FIG. 1, and FIG.
The figure is a B view in FIG. 2, FIG. 4 is a front view of the partition plate in FIG. 1, and FIG. 5 is a sectional view showing an example of a conventional device.
FIG. 6 is a sectional view taken along line CC in FIG. Work 0... Viscous fluid coupling device, 12... Rotating shaft, 14... Casing, 15... Rotor, 16...
・Cover, 18... Partition plate, 19... Storage room, 20
... Working chamber, 23... First return hole, 24... Second
Return hole, 29... spiral bimetal, 31... valve plate. 38... Water pump, 43... Vortex chamber, 46...
·thermostat

Claims (1)

[Claims] an input member driven by an engine and having a rotor thereon; an output member rotatably supported on the input member; a storage chamber fixed to the output member and storing a viscous fluid in an internal space of the output member; a partition plate that separates a working chamber that accommodates a rotor; a first return hole and a second return hole that are formed in the partition plate and that allow the viscous fluid to flow back from the storage chamber to the working chamber; a valve plate provided therein for controlling opening and closing of the first and second return holes, first opening the first return hole and then opening the second return hole when the temperature rises;
In the viscous fluid coupling device that controls torque transmission from the input member to the output member in three stages, the valve plate is moved onto the partition plate in conjunction with a spiral bimetal that is activated by detecting the air temperature passing through the radiator. The valve plate rotates to control the opening and closing of the first return hole, and the valve plate moves in the axial direction in conjunction with a thermostat activated by detecting the water temperature in the greenhouse of the water pump to control the opening and closing of the second return hole. Viscous fluid coupling device.