JP2888932B2 - Temperature sensitive fluid type fan coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a method of controlling the rotation of a fan for cooling an engine in an automobile.
The present invention relates to an improvement in the structure of a temperature-responsive fluid-type fan / coupling device which constantly senses a change in the external surrounding temperature in accordance with a running state and automatically controls the amount of cooling air to be supplied to an engine.

(Prior Art) Conventionally, as a fan coupling device of this kind, as shown in FIG. 5 and FIG. 6, a main part thereof flows from an oil sump chamber (26) to a torque transmission chamber (24). An outflow adjustment hole (25 ') is provided in the partition (25), and one end of the partition is provided by a connecting rod (29) that is linked to the deformation of the thermosensitive body provided in the front of the enclosure box in response to changes in external temperature. The other end of the valve member attached and fixed to (25) is displaced in the direction of coming and going with respect to the outflow adjustment hole (25 ') to open and close the outflow adjustment hole.

(Problems to be Solved by the Invention) However, in such a conventional technique, the flow rate of the oil in the outflow adjustment hole (25 ') is controlled by the valve member (28).
It is controlled by the distance between the flow control hole (25 ') of the partition plate (25) and the flow rate of the oil is accurate even if the valve member is accurately linked to the temperature change of the thermosensitive body. Did not come to control. That is, for example, in the closing stroke of the outflow adjusting hole (25 '), the oil freely passes through the outflow adjusting hole (25') until the oil narrows to a certain interval. The back pressure of the oil pressurized by the centrifugal force flowing out to the transmission chamber (24) causes a suction phenomenon at the outflow adjusting hole (25 ') in the valve member (28), and the flow path is rapidly formed. The oil flow into the torque transmission chamber (24) is sharply reduced, and the flow of the oil suddenly decreases. The flow of oil into the transmission chamber (24) increased rapidly.

This phenomenon is called "hunting" and is completely contrary to the original purpose of the temperature-responsive fluid-type fan-coupling device that attempts to proportionally control the number of revolutions of the fan according to changes in the external temperature. Was.

In the prior art in which the partition plate (25) is provided with an outflow adjusting hole (25 '), the distance (l ₁ ) between the attachment and the fixed portion and the axis of the connecting rod (29) is determined by the fixing portion. The valve member (28) is determined by the ratio (lever ratio) of the distance (l ₂ ) to the distance (l ₂ ) from the outflow adjustment hole (25 ′).
The outflow adjustment hole (25 ') is determined stroke for opening and closing the, the distance (l ₂₎ does not come off large, the stroke is large Torezu, therefore outflow adjusting hole in accordance with a change in the external temperature (25' a) It was delicate and difficult to control accurately.

Further, the outflow adjusting hole (25 ') is provided so as to avoid interference between the inner peripheral wall of the oil sump chamber (26) and the valve member (28).
Since it is provided on the inner side from the outermost peripheral side of 6), it is sent from the outflow adjustment hole (25 ') to the torque transmission chamber (24) side in a state where foamy air is considerably mixed in oil. Since the torque is transmitted in a state where a considerable amount of air is mixed in the oil, the transmission torque fluctuates and the fan rotation speed tends to become unstable.

The present invention has been made in view of the above-mentioned problems of the related art, and accurately controls the opening area of the outflow adjustment hole in accordance with a change in external temperature without causing a so-called “hunting” phenomenon to reduce the number of fan rotations. In addition to being able to increase or decrease proportionally, it responds delicately and accurately to changes in the external temperature, and sends oil with almost no air contamination to the torque transmission chamber through the outflow adjustment hole to prevent fluctuations in transmission torque and stabilize SUMMARY OF THE INVENTION It is an object of the present invention to provide a temperature-responsive fluid-type fan coupling device capable of obtaining a controlled fan rotation.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a case, which is supported via a bearing on a rotating shaft body having a drive disk fixed to a distal end thereof and a cooling fan is mounted on an outer peripheral portion. The inside of the sealed casing including the cover is partitioned by a partition plate into an oil sump chamber and a torque transmission chamber that houses the drive disk, and faces the outer peripheral side wall surface of the drive disk where oil is collected during rotation. A dam is formed in a part of the inner peripheral side wall surface on the sealer box side, and a circulation flow passage communicating with the dam from the torque transmission chamber side to the oil sump chamber side is formed, and is located on the oil sump chamber side. A valve member that has one end fixed to the interior wall of the oil sump, and opens the outflow adjustment hole that communicates from the oil sump chamber side to the torque transmission chamber side when the outside ambient temperature exceeds the set value on the other end side, and closes when the temperature is below the set value. With the temperature change of the temperature sensing element provided on the front of the cover. The drive shaft is provided on the drive shaft side by increasing / decreasing the effective connection area of oil in a torque transmission gap portion provided on an opposing wall near the outer side of the case and the cover serving as a drive disk. In the fan coupling device configured to suppress the transmission of torque from the driven side to the sealed casing side, an opening of the outflow adjustment hole opened and closed by the valve member is provided in a direction substantially orthogonal to the partition plate. And a case and a cover which are supported via a bearing on a rotating shaft body having a driving disk fixed to a tip end thereof, and a cooling fan is mounted on an outer peripheral portion. Partitioning the interior of the sealed casing into an oil sump chamber and a torque transmission chamber that houses the drive disk by a partition plate,
A dam is formed on a part of the inner peripheral side wall surface on the sealer box side facing the outer peripheral side wall surface of the drive disk in which oil is collected during rotation, and the dam communicates with the dam from the torque transmission chamber side to the oil sump chamber side. A circulating flow passage is formed, and one end thereof is fixed to the oil sump chamber side at the oil sump chamber side, and when the temperature of the outside ambient exceeds a set value at the other end side, the oil sump chamber side to the torque transmission chamber side A valve member that opens the outflow adjustment hole that leads to
A torque transmission gap provided on an opposing wall near the outside of the case and the cover, which is provided as a drive disk, is provided inside so as to interlock with distortion deformation caused by a temperature change of the temperature sensing element provided on the front surface of the cover. The oil sump chamber is formed in a fan coupling device in which the effective contact area of the oil is increased or decreased to suppress the transmission of torque from the rotary shaft body side on the drive side to the sealer housing side on the driven side. An outflow adjustment hole to the torque transmission chamber side is provided at a part of the peripheral side surface inside the cover, and the outflow adjustment hole is opened and closed by a seal provided at the tip of the valve member. A temperature-responsive fluid-type fan / coupling device, wherein the seal portion is constituted by a bent wall or a seal member, and the vicinity of the opening of the outflow adjustment hole and the sliding surface of the seal portion are substantially circular. Arc shaped And, also constitute forms a long hole in the circumferential direction or the axial direction of the outflow adjusting hole and the oil reservoir chamber.

(Operation) Since the present invention is configured as described above, the opening of the outflow adjustment hole that is opened and closed by the valve member is provided in a direction substantially orthogonal to the partition plate, and the inside provided on the cover side is provided. The structure of the outflow adjustment hole on the peripheral side surface and the structure of the seal portion of the valve member provided on the outer peripheral side for opening and closing the outflow adjustment hole allows the outflow adjustment hole of the seal portion to open and close during the opening and closing strokes of the valve member. By the displacement in the direction in which they slide with each other, the sticking phenomenon is prevented, and the opening area of the outflow adjustment hole itself is directly controlled by the seal portion of the valve member. Due to the outflow adjustment hole provided, oil containing almost no air is present in the outflow adjustment hole due to the centrifugal force applied to the oil, and the oil in this state is sent to the torque transmission chamber side, so that torque transmission is performed. Transmission in gap There is no fluctuation in torque, thus making the flow control function more accurate and stable without so-called "hunting" phenomena. Also, the slight movement of the connecting rod which moves due to the change of the external temperature in order to increase the lever ratio. Accordingly, the valve member moves greatly, and a delicate and accurate opening / closing operation of the outflow adjustment hole can be obtained.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a partially cutaway longitudinal sectional view of a temperature-responsive fluid-type fan coupling device of the present invention, and FIG. 2 (a) is a view near an outflow adjusting hole according to a main part of the present invention in FIG. FIG. 2 (b) is a cross-sectional view taken along line AA of FIG. 1 (a), and FIG. 2 (c) is a cross-sectional view taken along line BB of FIG. 2 (b). FIG. 3 is a partially enlarged longitudinal sectional view showing an embodiment of the present invention,
FIGS. 4 (a) to 4 (c) are views corresponding to FIGS. 2 (a) and 2 (b), respectively, showing another embodiment of the present invention, wherein (1) is a rotary shaft forming a driving side, and a tip end thereof. A drive disk (7) is fixedly mounted on the shaft, and a casing (2) in which a cooling fan (not shown) is mounted on the outer periphery of the shaft via a bearing, and a cover (3) are supported. Is what you do. (5) is a disk-shaped partition plate, which partitions the interior of the casing into an oil sump chamber (6) and a torque transmission chamber (4) containing the drive disk (7). is there. The drive disk (7) is located inside the torque transmitting chamber (4) and has a small gap for opposing wall surfaces and torque transmission. (8) is a valve member which is located on the oil sump chamber (6) side, one end of which is attached and fixed to the inner peripheral wall of the partition plate (5) or the cover (3), and sealed at the other end. The partition plate (5) is formed by the bent wall (8 ') configured as a part.
It is provided so as to open and close an outflow adjustment hole (14) to the torque transmission chamber (4) side provided in a part of a peripheral side surface inside the cover (3) in a direction substantially perpendicular to the direction.

The opening of the outflow adjusting hole (14) can be formed in an appropriate shape such as a circle, an oval, a triangle, a square, a trapezoid, etc., as shown in FIG. By making the holes long in the circumferential direction or in the axial direction, the displacement of the valve member, which will be described later, due to the temperature change can be accurately reflected in the opening area, so that the opening and closing of the outflow adjustment hole can be finely controlled. The valve member (8) is deformed by a temperature-sensitive body (10) made of a plate-like bimetal having both ends engaged with a support fitting (11) fixed to the front surface of the cover (3) due to a change in temperature around the outside. It is provided inside through a connecting rod (9) so as to be linked. Accordingly, in the present invention, as shown in FIG. 3, the distance (l ₁ ) between the tack and the fixing portion and the axis of the connecting rod (9), and the distance between the fixing portion and the outflow adjusting hole (14) ( The ratio (lever ratio) to l ₃ ) is larger than that of the prior art, and the valve member (8) is greatly displaced even by a slight movement of the connecting rod (9), so that a delicate and accurate opening / closing operation can be obtained.

(12) a dam, which is provided on a part of the inner peripheral side wall surface of the sealer box facing the outer peripheral side wall surface of the drive disk (7) where oil is collected by centrifugal force during rotation operation; At the same time, a circulation flow passage (13) from the torque transmission chamber (4) side to the oil sump chamber (6) side is provided following the inflow port provided in front of the dam in the rotation direction to provide a pumping function. What to do. Reference numeral (15) denotes a cooling fin provided outside the cover (3), and arrows by solid lines indicate the operating directions when the valve member (8) is opened and closed. Further, the present invention can also be applied to a temperature-responsive fluid-type fan-coupling device using a labyrinth mechanism in which the outer portion of the drive disk (7) and the opposing wall surface of the seal box are radially engaged with each other. Also, as shown in FIG. 4 (a), a weight body (16) is attached to the vicinity of the tip of the valve member (8), and particularly when a large centrifugal force is applied due to high rotation, the weight at the outflow adjustment hole (14) is increased. To ensure intimacy,
An elastic sliding member (17) such as polytetrafluoroethylene (PTFE) may be provided on the sliding surface of the valve member (8) to make the sliding smoother.

In the above embodiment, the seal portion is constituted by the bent wall (8 '). However, as shown in FIG. 4 (b), the seal portion is fixed by the seal member (8 ") fixed to the tip of the valve member (8). In addition, as shown in FIG. 4 (c), in order to facilitate the movement of the seal portion, a bent wall (sealing portion) near the opening of the outflow adjusting hole (14) in the oil sump chamber (6) and the seal portion is formed. 8 ')
Is preferably formed in a substantially arc shape.

(Effects of the Invention) As described above, in the temperature-responsive fluid-type fan coupling device according to the present invention, the opening of the outflow adjusting hole (14) opened and closed by the valve member (8) is divided by the partition plate (5). And a structure of an outflow adjustment hole (14) on the inner peripheral side surface provided on the cover (3) side, which is provided in a direction substantially orthogonal to
The opening and closing of the valve member (8) is performed by the bent portion (8 ') at the tip of the valve member (8) that opens and closes the outflow adjustment hole or the seal portion structure including the seal member (8 "). Therefore, the pressing force of the connecting rod (9) (when closed) and the repulsive force of the valve member (8) itself (when opened) interlocked with the deformation of the temperature sensing element (10).
The opening area in the outflow adjustment hole (14) is reduced by the displacement of the seal portion of the valve member (8) and the outflow adjustment hole (14), which are actuated by each other, in the sliding direction. Directly controlling the valve member (8) so as to prevent the sticking phenomenon of the valve member (8), thereby preventing the so-called "hunting" phenomenon, and accurately opening the outflow adjusting hole (14) in response to a change in external temperature. The area has increased and decreased, and the distance (l ₃ ) between the connecting rod (9) and the outflow adjusting hole (14) has been increased, so that the outflow adjusting hole (14) opens and closes even if the connecting rod (9) moves slightly. Therefore, delicate and accurate operation is assured. Further, since the outflow adjusting hole (14) is provided on the outermost peripheral side of the oil sump chamber (6) where oil with almost no air mixing exists, the oil is fed from the outflow adjusting hole. Such oil is used to change the transmission torque in the torque transmission chamber (4). The flow control function can be performed accurately and stably by reducing the number of movements to stabilize the fan rotation speed.
By forming 4) as a long hole, it is possible to effectively exert high-precision control of torque transmission and further improve its characteristics as a product. It is a ring device.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a temperature-responsive fluid-type fan coupling device of the present invention, and FIG. 2 (a) is a view near an outflow adjusting hole according to a main part of the present invention in FIG. FIG. 2 (b) is a cross-sectional view taken along line AA of FIG. 2 (a), and FIG. 2 (c) is a cross-sectional view taken along line BB of FIG. 2 (b). FIG. 3 is a partially enlarged longitudinal sectional view showing an embodiment of the present invention,
4 (a) to 4 (c) are views corresponding to FIG. 2 (a), respectively, showing another embodiment of the present invention, and FIG. 5 is a partial cutout due to enlargement near the outflow adjustment hole showing a conventional example. Sectional view, FIG.
It is a top view of a figure. (3) ... cover, (6) ... oil reservoir, (8) ... valve member,
(8 '): bent wall; (8 "): sealing member; (14): outflow adjustment hole.

Claims (5)

(57) [Claims] 1. A sealer box, which is supported via a bearing on a rotating shaft body having a drive disk fixed to a distal end thereof and has a cooling fan mounted on an outer peripheral portion thereof, comprises:
The partition plate is partitioned into an oil sump chamber and a torque transmission chamber housing the drive disk, and one of the inner peripheral side wall surfaces on the sealer box side facing the outer peripheral side wall surface of the drive disk for collecting oil during rotation. A dam and a circulating flow passage communicating with the dam from the torque transmission chamber side to the oil sump chamber side, and having one end positioned on the oil sump chamber side and fixed to the oil sump chamber inner wall, A valve member is provided on the front surface of the cover, in which a valve member is provided at the front side of the cover to open an outflow adjustment hole communicating from the oil sump chamber side to the torque transmission chamber side when the temperature of the outside ambient exceeds a set value on the end side, and to close the outlet adjustment hole below the set value. Prepared inside to be linked to the deformation due to the temperature change of the body,
Increase / decrease the effective connection area of oil in the torque transmission gap provided on the opposing wall near the outer side of the case and the cover forming the drive disk, and from the drive side rotating shaft side to the driven side sealer box side In the fan coupling device for controlling the transmission of the torque, the opening of the outflow adjusting hole (14) opened and closed by the valve member (8) is divided by the partition plate (5).
A temperature-responsive fluid-type fan coupling device characterized by being provided in a direction substantially orthogonal to the above. 2. A sealer housing, which is supported via a bearing on a rotating shaft body having a drive disk fixed to a tip end thereof and has a cooling fan mounted on an outer peripheral portion thereof, comprises:
The partition plate is partitioned into an oil sump chamber and a torque transmission chamber housing the drive disk, and one of the inner peripheral side wall surfaces on the sealer box side facing the outer peripheral side wall surface of the drive disk for collecting oil during rotation. A dam and a circulating flow passage communicating with the dam from the torque transmission chamber side to the oil sump chamber side, and having one end positioned on the oil sump chamber side and fixed to the oil sump chamber inner wall, A valve member is provided on the front surface of the cover, in which a valve member that opens an outflow adjustment hole communicating from the oil sump chamber side to the torque transmission chamber side when the ambient temperature exceeds the set value on the end side and closes when the temperature is equal to or lower than the set value. Prepared inside to be linked to the deformation due to the temperature change of the body,
Increase / decrease the effective connection area of oil in the torque transmission gap provided on the opposing wall near the outer side of the case and the cover forming the drive disk, and from the drive side rotating shaft side to the driven side sealer box side In the fan coupling device configured to control the transmission of the torque, a part of the inner peripheral surface of the cover (3) forming the oil reservoir (6) is provided on the side of the torque transmission chamber (4). A temperature-sensitive type fluid fan characterized in that the outflow adjusting hole (14) is provided at a position, and the outflow adjusting hole is opened and closed by a seal provided at the tip of the valve member (8).・ Coupling device. 3. The temperature-responsive fluid-type fan coupling device according to claim 2, wherein said seal portion is constituted by a bent wall (8 ') or a seal member (8 "). 4. The temperature-responsive fluid fan according to claim 2, wherein the flow-adjusting hole (14) has a substantially arc-shaped slidable surface near the opening and a seal portion. Coupling device. 5. The temperature-responsive fluid according to claim 1, wherein the outflow adjusting hole (14) and the oil reservoir chamber (6) are formed as long holes in the circumferential or axial direction. Type fan coupling device.