JPH04181030A - Viscous fluid coupling device - Google Patents

Abstract

PURPOSE:To prevent drop of the torque transmission efficiency by closing the passage within a rotor by means of the rotor centrifugal force when the shaft rotational frequency is high, thereby reducing the torque transmission quantity between transmission components in the working chamber. CONSTITUTION:When the input rotational frequency to a shaft 11 is low, a valve body 32 of a rotor 16 opens a third passage 19, so that the flow of a viscous fluid in the X arrow direction is permitted. Accordingly, a first transmission component 16a and a second transmission component 16b both work. On the other hand, when the input rotational frequency to the shaft 11 is high, the valve body 32 closes the third passage 19, so that the flow of the viscous fluid is stopped as indicated by an arrow Y. Accordingly, only the first transmission member 16a works, thereby cutting the unnecessary torque transmission quantity in the high speed rotation region, lowering the fan noise, reducing the engine drive loss horsepower and lowering the viscous fluid temperature.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a viscous fluid coupling device.

(Prior art) As the prior art related to the present invention, for example, Japanese Patent Application Laid-Open No. 63-1999-
There is one disclosed in Japanese Patent No. 180727.

This conventional viscous fluid coupling device 70 will be explained based on FIG. 6. A housing 72 is supported by a shaft 71 so as to be relatively rotatable, and the housing 72 is divided into a body 72a and a cover 72b. The inside of the housing 72 in which the viscous fluid is sealed is divided into a storage chamber 74 and a working chamber 75 by a partition plate 73. Inside the working chamber 75, there is a first transmission section fixed to one end of the shaft 71. A rotor 76 having a second transmission section 76a and a second transmission section 76b is disposed.

The partition plate 73 is formed with a first passage 77 and a second passage 78 that communicate with the storage chamber 74 and the working chamber 75, respectively, and the rotor 76 is formed with a third passage that can overlap with the second passage 78.
A passage 79 is formed.

Here, the storage chamber 74 and the first transmission section 76a are the first passage 7
7, the storage chamber 74 and the second transmission section 76b are communicated with each other through a second passage 78 and a third passage 79, respectively.

Further, a valve member 80, which is slidably disposed on the section vi73 and can freely open and close the first passage 77 and the second passage 78, is connected to a temperature sensitive means (e.g. (bimetal) 81.

Further, a fan (not shown) is installed outside the housing 72 to cool a radiator (not shown) of an engine (not shown) in which the viscous fluid coupling device 70 is installed. This engine is normally installed in a car (not shown).

(Problems to be Solved by the Invention) In the conventional viscous fluid coupling device 70 described above, when the engine temperature is high and the engine speed is high, a high engine speed input to the shaft 71 is transmitted (see FIG. 4). ), the fan also rotates at high speed and the amount of air it blows is extremely large.

However, when the engine is rotating at high speed, the speed of the vehicle is also high, and the amount of air flowing into the radiator is large. Therefore, when the engine rotates at high speed, the fan air volume may be small, so the conventional viscous fluid coupling device 70 increases the horsepower loss of the engine, and also increases the internal temperature (see Figure 5), reducing the torque transmission efficiency. It has the following problems.

Therefore, in the present invention, a technical issue is to reduce the excessive torque transmission in the viscous fluid coupling device.

[Structure of the Invention] (Means for Solving the Problems) The technical means of the present invention taken to solve the above-mentioned technical problems of the present invention include a shaft and a housing supported by the shaft so as to be relatively rotatable. a partition plate that partitions the inside of the housing into a storage chamber and an operating chamber; a partition plate fixed to one end of the shaft and disposed within the operating chamber;
A rotor having a transmission part; a first passage and a second passage formed in the partition plate and communicating the storage chamber and the working chamber, respectively; and a third passage formed in the rotor and capable of superimposing with the second passage. , a viscous fluid coupling device having a first passage and a second passage which can be freely opened and closed, and a valve member which is rotated by a temperature sensitive means disposed outside the housing. An opening/closing means for freely opening and closing the three passages is provided, and the opening/closing means closes the third passage when the shaft rotation speed is high.

(Function) According to the technical means of the present invention described above, when the rotational speed input to the shaft is high, the third passage is closed by the action of the opening/closing means, and the amount of torque transmitted at the second transmission section is reduced. , When the engine speed of a car is high, the air volume of the fan driven by the viscous fluid coupling device decreases.
Wasteful torque transmission is reduced.

(Example) Hereinafter, an example embodying the technical means of the present invention will be described based on the accompanying drawings.

The viscous fluid coupling device IO of the present invention is normally mounted on an engine (not shown), and this engine is mounted in an automobile (not shown).

1 to 3, a housing 12 is relatively rotatably supported by a shaft 11 of a viscous fluid coupling device 10 via a bearing 23, and the housing 12 is connected to a body 12.
a and a cover 12b.

The inside of the housing 12 in which the viscous fluid is sealed is divided into a first storage chamber (storage chamber) 14 and a working chamber 15 by a first partition plate (partition plate) 13. A rotor 16 is fixed to one end of the rotor 16 and has a first transmission section 16a, a second transmission section 16b, and a gear cutter 16c. The first transmission section 16a includes the first partition plate 13
The second transmission section 16b is formed by a plurality of ring-shaped grooves formed on the right side surface of the rotor 16 facing each other, and a plurality of ring-shaped grooves formed on the left side surface of the rotor 16 as shown in the figure. A plurality of ring-shaped grooves are formed on the left side surface of the plate 27 in the figure, and a plurality of ring-shaped grooves are formed on the right side surface of the rotor 16 in the figure, which are opposed to each other.

The first partition plate 13 is formed with a first passage 17 and a second passage 18 that communicate with the first storage chamber 14 and the working chamber 15, respectively. A third passage 19 is formed. Here, the first storage chamber 14 and the first transmission section 16a communicate with each other through a first passage 17, and the first storage chamber 14 and the second transmission section 16b communicate with each other through a second passage 18 and a third passage 19, respectively.

Further, a valve member 20, which is slidably disposed on the first partition plate 13 and can freely open and close the first passage 17 and the second passage 18, is provided with a temperature sensitive means ( For example, it is rotated by a bimetallic 21 via a rod 22.

A pump hole 24 and a pump protrusion 25 are formed at the outer peripheral end of the first partition plate 13 to communicate the first storage chamber 14 and the working chamber 15.

A second partition plate 27 that partitions the working chamber 15 and the second storage chamber 26 is fixed to the body 15, and the working chamber 15 and the second storage chamber 26 are defined at the outer peripheral end of the second partition plate 27. A pump hole 28 and a pump protrusion 29 are formed to communicate with each other.

An opening/closing means 30 for opening and closing the third passage 19 is disposed inside the rotor 16. In this opening/closing means 30, a valve body 32 is slidably housed in a housing portion 31 formed in the rotor 16, and the valve body 32 is held in the third passage 19 by a spring 33.
is biased in the direction of closing. Further, the plug 34 is connected to the valve body 3
2 and spring 33 from coming off.

Further, a fan (not shown) is installed outside the housing 12 to cool a radiator (not shown) of the engine in which the viscous fluid coupling device 10 is installed.

The operation of the viscous fluid coupling device 10 having the above configuration will be described below.

When the engine is started, the temperature of the cooling water gradually rises, and the temperature of the air passing through the radiator also rises.

Here, the temperature of the air passing through the radiator is detected by the temperature sensitive means 21, and the valve member 20 is rotated according to the detected temperature. That is, when the detected temperature is low, the valve member 20
The amount of rotation is small, and both the first passage 17 and the second passage 18 remain closed.

Among the viscous fluids present in the first storage chamber 14 and the second storage chamber 26 when the engine is stopped, the viscous fluid in the second storage chamber 26 is sucked out of the viscous fluid in the working chamber 15 by the suction action of the pump hole 28 and the pump protrusion 29. Although it is sucked out to the second transmission part 16b side, it is sent to the first transmission part 16a side by the gear cutter 16c, and by the action of the pump hole 24 and the pump protrusion 25,
It is sent to the first storage room 14. Therefore, for a while after startup, the viscous fluid in the second storage chamber 26 is transferred to the first storage chamber 26.
Most of it is sent to 4.

Therefore, the amount of viscous fluid in the working chamber 15 is very small, and the amount of torque transmitted in the first transmission section 16a and the second transmission section 16b is also small, so that only a small amount of rotational torque given to the shaft 11 is transmitted to the housing 12. housing 1
The rotation speed of the fan fixed to 2 is low. (ON in FIG. 4) Next, when the temperature of the air passing through the radiator becomes a little high, the temperature sensitive means 21 rotates the valve member 20 a little to open only the first passage 17. Therefore, the viscous fluid in the first storage chamber 14 flows out to the first transmission section 16a through the first passage 17, and transmits the rotational torque of the shaft 11 to the housing 12 via the first transmission section 16a. At this time, the fan rotation speed becomes medium. (MID in FIG. 4) Here, the viscous fluid in the first transmission section 16a is transferred to the pump hole 2.
4 and the pump protrusion 25, the viscous fluid is collected into the first storage chamber 14 one after another (therefore, the viscous fluid is transferred from the first storage chamber to the first passage 17 to the first transmission section 16a and the middle pump hole 24 = 4 to the first storage chamber. and reflux.

Further, when the temperature of the air passing through the radiator becomes high (when the temperature of the air passing through the radiator becomes high), the temperature sensing means 21 further rotates the valve member 20 to open the first passage 1.
7 and the second passage are both open.

Therefore, the viscous fluid in the first storage chamber 14 flows out through the first passage 17 to the first transmission section 16a, and at the same time flows out into the second passage 1.
8 and the third passage 19 to the second transmission section 16b, and transmits the rotational torque of the shaft 11 to the housing 12 via the first transmission section 16a and the second transmission section 16b. At this time, the fan rotation speed becomes maximum. (O in Figure 4
N) Here, when the input rotation speed to the shaft 11 is low, the valve body 32 opens the third passage 19 as shown in FIG.
The viscous fluid is passed through as shown by arrow X. Therefore, the first transmission section 16a and the second transmission section 16b work together.

On the other hand, when the input rotation speed to the shirt 11 is high, the third
As shown in the figure, the valve body 32 closes the third passage 19 and
Do not allow viscous fluids to pass through as shown. Therefore, only the first transmission section 16a acts, and the second transmission section 16b does not act. This leads to a reduction in the fan speed in the high engine speed range, but in the high engine speed range, the vehicle speed of the car is generally high and the amount of air introduced to the front of the radiator is large, so the fan speed can be reduced (even if it is low). It is from.

In this way, canting unnecessary torque transmission in the high-speed rotation range is useful for reducing fan noise, engine drive loss horsepower, and lowering the viscous fluid temperature.

Further, the opening/closing means 30 opens and closes according to the rotational speed of the shaft 11 regardless of the rotational position of the valve member 20.
Even if the opening/closing means 30 operates when only the passage 17 is open, it does not matter because the second i-circuit 18 is closed.

In this embodiment, the valve member is driven (rotated) in response to the air temperature using a bimetal, but it goes without saying that the valve member may be driven in response to the engine cooling water temperature.

Further, in this embodiment, only one third communication hole and one opening/closing means are shown, but the number is not limited and may be two, three, or more.

〔Effect of the invention〕

As described above, in the present invention, when the rotational speed input to the shaft is high, the third passage is closed by the action of the opening/closing means, and the amount of torque transmitted at the second transmission section is reduced. When the engine rotates at high speed, the air volume of the fan driven by the viscous fluid coupling device is reduced, reducing unnecessary torque transmission.

Further, since the amount of torque transmitted is reduced, the amount of internal heat generated in the viscous fluid coupling device is also reduced, and the durability of the enclosed viscous fluid is also increased.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a viscous fluid coupling device 10 according to an embodiment of the present invention. FIG. 2 shows an enlarged sectional view of the main part in FIG. 1 when the rotational speed of the shaft 11 is low. FIG. 3 shows an enlarged sectional view of the main part in FIG. 1 when the rotational speed of the shaft 11 is high. FIG. 4 shows a characteristic diagram of fan rotation speed and shaft rotation speed. FIG. 5 shows a characteristic diagram of the internal temperature of the housing 12 and the shaft rotation speed. Figure 6 shows
1 shows a cross-sectional view of a prior art viscous fluid coupling device 70. FIG. DESCRIPTION OF SYMBOLS 10... Viscous fluid coupling device, 11... Shaft, 12... Housing, 13... First division plate (division plate), 14... First storage chamber (storage chamber), 15... - Working chamber, 16... Rotor, 16a... First transmission section, 16b... Second transmission section, 17... First passage, 18... Second passage, 19... Third Passage, 20... Valve member, 21... Temperature sensing means, 30... Opening/closing means.

Claims (1)

[Scope of Claims] A shaft; a housing supported by the shaft so as to be relatively rotatable; a partition plate that partitions the inside of the housing into a storage chamber and an operating chamber; a rotor disposed within a working chamber and having a first transmission section and a second transmission section; a first passage and a second passage formed in the partition plate and communicating the storage chamber and the working chamber, respectively; a third passage formed and capable of superimposing with the second passage; and a valve member capable of freely opening and closing the first passage and the second passage and rotated by a temperature sensitive means disposed outside the housing. In the viscous fluid coupling device, an opening/closing means for freely opening and closing the third passage according to the centrifugal force of the rotor is disposed inside the rotor, and the opening/closing means is configured to open and close the third passage when the shaft rotation speed is high. A viscous fluid coupling device characterized in that the third passage is closed when the third passage is closed.