JPH051729A - Temperature sensing fluid type fan/coupling device - Google Patents

Abstract

PURPOSE:To provide a coupling device with an accurate and efficient control characteristic by performing linea control with fine adjusting function for an oil rate following change of an external temperature, in repeated opening/closing operations. CONSTITUTION:An inner space of a sealed device supported onto a rotary shaft to which a driving disc is fixed is divided into an oil reservoir chamber and a torque transmission chamber in which the driving disc is installed, by means of a partition plate having a supplying port. A dam and an inlet to a discharge flow passage to the oil reservoir chamber, in the vicinity of the dam, are formed on an inner peripheral wall surface on the side of the sealed device, opposing to the driving disc. A valve member which opens and closes the supplying port with regard to a preset value according to change of an external temperature is arranged inside interlockingly with an external vortex-formed temperature sensing body, so as to control transmission of a rotational torque from the rotational shaft to the sealed device. A supplying port 5' on a partition plate 5 is a long port having substantially linear shape in a radialy direction. A beak-like tip is provided on the valve member, which tip is located on a rear part in a rotationa direction for opening a port accompanied with temperature rise and outside in a radial direction and backward projectingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a temperature-sensitive fluid type fan / coupling device for automatically controlling the rotation of a fan for cooling an engine in an automobile so as to constantly supply the engine with a cooling air flow according to a running condition. It is a thing.

[0002]

2. Description of the Related Art Conventionally, as a fan coupling device of this type, for example, as shown in FIG. 4, an oil supply hole (25 ') provided on the outer peripheral side of a partition plate (25) is a perfect circular hole. None, on the other hand, the valve member (27) for opening and closing the supply hole is formed in a rectangular shape and provided inside. Incidentally, (26) is a drive disk.

[0003]

However, in such a conventional technique, at the time of oil outflow and closing due to the opening / closing operation of the supply hole (25 '), a perfect circular hole and a rectangular valve member (27) are formed. From the shape of), the characteristic is that it has a function of on-off characteristic generally called, and it cannot be an ideal linear control, so it was unsatisfactory for the control characteristic as a coupling device. . Also, on-
The noise of the fan due to the abrupt change of rotation due to the off characteristic was also one of the problems to be solved.

The present invention has been made in view of the above problems of the prior art. Linear control is performed by a function of finely adjusting the amount of oil in the supply hole, so that the control characteristics of the coupling device can be made more accurate. It is an object of the present invention to propose a temperature-sensitive fluid-type fan / coupling device that can be efficiently exerted.

[0005]

In order to achieve the above object, the present invention provides a case in which a rotating shaft having a drive disk fixed to the tip end is supported by a bearing and a cooling fan is attached to the outer peripheral part. The inside of the sealer case composed of the cover is divided into an oil reservoir chamber and a torque transmission chamber containing the drive disc by a partition plate having an oil supply hole, and the drive disc for collecting the oil during rotation is separated. A dam is provided in a part of the inner peripheral side wall on the side of the sealer facing the outer peripheral side wall, and an inlet of a discharge flow passage communicating from the torque transmission chamber side to the oil sump chamber side near the front side in the rotation direction of the dam. A rotary valve member that is formed and located in the oil sump chamber and is interlocked with the deformation of the spiral temperature sensor provided on the front surface of the cover due to the temperature change, and the drive disk, the case, and the partition plate. In the torque transmission gap provided on the opposite wall near the outside In a fan / coupling device configured to control the rotational torque transmission from the driving-side rotating shaft to the driven-side sealing box by increasing or decreasing the effective contact area of oil, the supply hole on the partition plate is Rotation of the valve member, which is formed into a substantially linear elongated hole in the radial direction, and has a beak-like shape that projects outward in the radial direction rearward on the rear side in the rotational direction of the valve member due to temperature rise. Temperature-sensing fluid type fan cup configured to increase or decrease the opening area of the supply hole in the radial direction or reduce the amount of oil supplied from the oil sump chamber to the torque transmission chamber steplessly. A ring device is a gist, and the gradient of the tangent line of the contour of the beak-shaped tip portion is increased as the outer diameter increases, and a resistance pin for adjusting the flow rate is provided inside the discharge flow passage. It is what constitutes.

[0006]

According to the present invention, the supply hole is formed as an elongated hole having a substantially straight line in the radial direction in this manner, and is located at the outer side in the radial direction on the rear side in the direction of rotation to the opening due to the temperature rise and to the rear. Since the structure is constructed by combining with the valve member consisting of the protruding beak-shaped tip portion, when the supply hole is opened due to the rise of the external temperature, the supply hole is opened from the inside, and at this time, the structure described above is used. As a result, the opening area increases rapidly at the beginning of the opening stroke,
On the other hand, from the middle to the end of the opening stroke, the beak-shaped tip portion slightly increases the opening area, and the amount of oil flowing into the torque transmission chamber slightly increases in accordance with this increase amount. Originally, the fluid type fan / coupling device transmits torque by utilizing the viscosity of high-viscosity silicon oil. The larger the transmission surface is, the larger the transmission torque becomes. The radial position of the oil level greatly affects the magnitude of the transmitted torque. That is, the rate at which the large radial portion contributes to transmission is much greater. Therefore, it is necessary to provide a beak-shaped portion on the outer side in the radial direction on the rear side in the direction of rotation of the valve member to the opening, and to increase the gradient of the tangent of the contour of the beak-shaped tip portion as the outer diameter increases. It effectively acts to linearly control the relationship between the rise in external temperature and the fan speed.

On the other hand, the closing process of the supply hole can be linearly controlled for the same reason as described above. Therefore, the control characteristics of the coupling device can be made more accurate and efficiently exhibited.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1A is a vertical cross-sectional view of a temperature-sensitive fluid type fan / coupling device according to the present invention with a partial cutout, and FIG. 1A is a cross-sectional view taken along the line AA, FIG. 2 is a front view showing a state of a supply hole and a valve member in a partition plate according to the main part of the present invention of FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 1 is an enlarged vertical cross-sectional view of a main part of a rotary shaft body, in which a disk-shaped drive disk (7) is fixed to the tip end of the rotary shaft body, and a flange wall for mounting to a mating base body ( 1 ') is included in the drive side. Then, on the shaft body, a bearing (B) is used to support a sealed case as a driven side, which is composed of a case (2) having a cooling fan (not shown) attached to the outer periphery and a cover (3). It will be. (5) is a partition plate, which is a torque transmission chamber in which the oil reservoir chamber (6) and the drive disk (7) are housed inside the sealed box.
(4), and a supply hole (a long hole that is substantially linear in the radial direction from the oil sump chamber (6) to the torque transmission chamber (4) on the partition plate ( 5 ') is provided. And the drive disk (7) is located in the torque transmission chamber (4) and the partition plate (5)
And a minute gap for transmitting torque is held on the wall surface facing the case (2). Reference numeral (8) is a plate-like rotary valve member that opens and closes the supply hole (5 '), and is an extension base end portion eccentric to the front side in the direction of rotation toward the opening due to temperature rise and extending in the radial direction ( 8b) and a beak-shaped tip portion (8a) protruding rearward in the radial direction on the rear side, the outer end of which is connected to the cover side, and the center end is connected to the connecting rod (9). ) Side is provided with a temperature sensitive body (10) made of spiral bimetal, which is provided on the front surface of the cover (3), and the temperature sensitive body is accompanied by the temperature change of the outside environment.
The valve member (8) is fixed and rotated on the connecting rod which is interlocked with the deformation of (10). The slope (θ) of the tangent to the contour of the beak-shaped tip portion (8a) is increased as it goes to the outer diameter, so that the beak-shaped tip portion (8) of the valve member (8) accompanying temperature rise is increased.
The opening operation of the oil supply hole (5 ') by a) starts from the innermost side in the radial direction and gradually progresses to the outer diameter side, and the opening rate per unit temperature change is gradually decreased and the closing operation is accompanied by the temperature drop. Is reversed. Reference numeral (11) is a dam, which faces the outer peripheral side wall surface of the drive disk (7) that collects oil during rotation.
It is provided on a part of the inner peripheral side wall surface of (2), and at the same time, the discharge flow from the torque transmission chamber (4) side to the oil sump chamber (6) side near the dam on the front side in the rotation direction. Inlet (12 ') of road (12)
Is provided and the pumping function is performed by the flow passage.

The dotted arrow indicates the rotational direction of the drive disk (7), and the solid arrow indicates the valve member on the partition plate (5).
The sliding directions of (8) are shown respectively. When the valve member (8) opens and closes the supply hole (5 '), the temperature sensor
The valve member (8), which continuously follows the set value as a boundary in tandem with the deformation according to the temperature change of the outside surroundings caused by (10), can smoothly rotate to the left and right, and the oil amount fine adjustment function. The linear control is performed by. That is, when the supply hole (5 ') is opened due to an increase in the external temperature, the supply hole opens from the inside, but the opening base area (8b) is opened at the beginning of the opening process, and the opening area rapidly increases. However, from the middle to the end of the opening stroke, the beak-shaped tip (8a) slightly increases the opening area, and the amount of oil flowing into the torque transmission chamber (4) also slightly increases according to this increase. Therefore, the amount of oil flowing from the oil sump chamber (6) into the torque transmission chamber (4) can be adjusted from the beginning to the end of the opening stroke to linearly control the relationship between the external temperature rise and the fan rotation speed. On the other hand, the closing process of the supply hole can be linearly controlled for the same reason as above.

Further, as shown in FIG. 3, a resistance pin (13) for adjusting the flow rate is installed in the discharge flow passage (12) to have a throttling function so that the flow rate can be easily adjusted as desired. .

[0011]

As described above, since the temperature-sensitive fluid type fan / coupling device according to the present invention is composed of the supply hole (5 ') and the valve member (8) having the above-mentioned shape, It is possible to perform ideal linear control of the opening / closing operation by the valve member (8) by the fine adjustment function of the oil amount according to the external temperature change, so that the control characteristics of the coupling device can be made more accurate. It can be efficiently exerted.

[Brief description of drawings]

FIG. 1A is a vertical cross-sectional view of a temperature-sensitive fluid type fan / coupling device according to the present invention with a partial cutaway.

FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A.

FIG. 2 is a front view showing a state of a supply hole and a valve member in the partition plate according to the main part of the present invention in FIG.

FIG. 3 is an enlarged vertical sectional view of an essential part of another embodiment of the present invention.

FIG. 4 is a front view showing a state of a supply hole of a partition plate and a valve member in a conventional example.

[Explanation of symbols]

4 Torque transmission chamber 5 partition boards 5'supply hole 6 oil sump chamber 8 valve members 8a Beak-shaped tip 8b Extension base part 13 resistance pin

Claims (3)

[Claims] 1. An oil supply is provided to the inside of a sealed casing which is supported by a bearing on a rotary shaft having a drive disk fixed to its tip and which has a case and a cover with a cooling fan attached to the outer periphery. A partition plate having a hole separates the oil storage chamber from the torque transmission chamber containing the drive disk, and faces the outer peripheral side wall surface of the drive disk where oil is collected during rotation, and faces the sealer case inner side. A dam is formed on a part of the wall surface, and an inflow port of a discharge flow passage that extends from the torque transmission chamber side to the oil sump chamber side in the vicinity of the front side in the rotation direction of the dam is formed, and the dam is located in the oil sump chamber and is located in the cover. A torque transmission gap portion provided on the opposing wall surface near the outside of the drive disk and the case and the partition plate, which is provided with a rotary valve member that interlocks with the deformation of the spiral temperature-sensitive body due to temperature change. Rotating shaft on the drive side by increasing or decreasing the effective contact area of oil in In the fan-coupling device that controls the rotational torque transmission from the driven side to the sealed box on the driven side, the supply hole (5 ') of the partition plate (5) is provided with a substantially straight elongated hole in the radial direction. In addition, the valve member (8) has a beak-like shape that projects rearward outward in the radial direction at the rear side in the direction of rotation of the valve member (8). The opening area of (5 ') is expanded or reduced in the radial direction, and the amount of oil supplied from the oil sump chamber (6) to the torque transmission chamber (4) side is increased or decreased in a stepless manner. A temperature sensitive fluid type fan / coupling device. 2. The beak-shaped tip portion (8) according to claim 1,
A temperature-sensitive fluid type fan / coupling device characterized in that the tangential gradient (θ) of the ring portion of a) is increased as the outer diameter is increased. 3. The temperature-sensitive fluid type fan / coupling device according to claim 1, wherein a resistance pin for adjusting a flow rate is provided inside the discharge flow passage.