JP2791576B2 - Temperature sensitive fluid type fan coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention generally relates to a temperature-responsive fluid type in which the rotation of a fan for cooling an engine in an automobile is controlled to constantly supply a cooling air flow according to a running state to the engine. The present invention relates to an improvement in the structure of a fan coupling device.

[Prior art] Conventionally, as this kind of fan coupling device,
The opposing wall surface between the vicinity of the outer peripheral edge of the disk-shaped drive disk fixed on the rotating shaft body and the sealer box side, which is the main part of the present invention, is merely formed by a smooth surface state.

[Problems to be Solved by the Invention] However, the fan and the fan having such a conventional configuration
According to the coupling device, since the surface state of the smooth opposing wall surface causes the oil to flow out of the torque transmission gap during rotation only by centrifugal force accompanying the rotation, the oil in the gap is The oil flow rises due to the heat generated by shearing for a long time due to the slow flow of the oil, and the oil circulates and circulates in a short time internally. Drop), causing an error in the appropriate control function that follows the temperature change of the outside environment, and the oil does not flow smoothly into the circulation flow passage due to the fluctuation of the oil pressure near the dam. The engine has a problem of causing hunting, and the adjusting hole side in the state of the valve member opening the outflow adjusting hole of the partition plate in the high-temperature operating state is sunk below the oil level of the oil sump chamber and the engine Is stopped, The oil that has flowed into the gap on the torque transmission chamber side due to spontaneous outflow of the oil in the oil sump chamber from the outflow adjustment hole between the cars causes centrifugal force due to rotation in the gap when the engine is subsequently restarted. Owing to the above-mentioned slow outflow, there is a problem that "slipping" occurs on the driven side for a certain period of time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has a torque transmission gap portion due to not only the centrifugal force of the oil itself during rotation but also the guide action and pumping action by fins or concave groove walls during rotation operation. From the oil to the dam side to activate the dam function, minimize the temperature rise of the oil due to the heat received due to shearing for torque transmission, and quickly circulate the entire oil inside, Good heat dissipation to the outside to reduce the change (decrease) in the viscosity of the oil, prevent hunting, and follow the temperature change of the outside environment for a long time to exhibit a more appropriate control function. It is an object of the present invention to propose a fan coupling device capable of performing the following.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cover and a case which are supported via a bearing on a rotating shaft body having a driving disk fixed to a tip thereof and a cooling fan is mounted on the outer periphery. The interior of the sealer box is divided into an oil sump chamber and a torque transmission chamber that houses the drive disk by a partition plate having an oil outflow adjustment hole, and a drive disk for collecting oil during rotation. A dam and a circulating flow passage extending from the torque transmission chamber side to the oil sump chamber side are formed in a part of the inner peripheral wall face on the sealer box side facing the outer peripheral wall section, and the temperature of the external surrounding is reduced. When the set value is exceeded, the outflow adjustment hole of the partition plate is opened, and when the set value is less than the set value, a valve member that closes is provided inside so as to interlock with a deformation due to a temperature change of the temperature sensing element provided on the front surface of the cover, Outside the drive disk and the case and cover A fan cup configured to control the transmission of torque from the rotating shaft side to the driven casing side by increasing or decreasing the effective oil contact area in the torque transmission gap provided on the opposing wall near the side. In the ring device, a temperature-sensitive fluid having a large number of radially radially extending fins or concave groove walls at least on a dam side of a wall surface facing the outer peripheral edge of the drive disk on the sealer box side. The fin or the concave groove wall is formed radially at an angle inclined in the rotational direction with respect to the radial direction at the position of the sealer box, or The fins or the groove walls may be formed on the sealer box of the drive disk having a labyrinth mechanism on the side opposite to the labyrinth mechanism section, and further, the torque may be applied to the sealer box radially outward from the dam. It is to or forming idle oil reservoir annular leading to Itarushitsu.

[Operation] Since the present invention has such a configuration, not only the centrifugal force to the oil at the time of rotation but also the oil due to the structure of a large number of fins or concave groove walls provided on the sealer box side, The guide action and the pumping action by the fins or the groove walls promote oil transmission from the torque transmission gap to the dam side, and particularly increase the pressure of oil collected in the dam section to efficiently perform the dam function. Prevents hunting and activates the flow in the gap to stabilize the control function, shortens the oil passage time in the torque transmission gap, and thereby receives shear for torque transmission and receives heat. By shortening the time, the temperature rise of the oil is suppressed as much as possible, the circulation and circulation of the entire oil inside is performed quickly and smoothly, and the heat is radiated to the outside well, and the fan rotation accompanying the viscosity change (decrease) of the oil is performed. Due to a decrease in the number This eliminates the problem of a decrease in the cooling capacity of the engine, and makes it possible to exhibit a more appropriate control function by following the temperature change of the external environment for a long time.

In addition, if necessary, an annular idle oil sump chamber that is located radially outward from the dam and that communicates with the torque transmission chamber on the inner peripheral wall portion of the sealer box is provided, so that the circulation and circulation of the oil can be performed. The oil in the torque transmission chamber is immediately discharged toward the idle oil sump chamber by the rapidity, the centrifugal force on the oil generated by the rotation, and the guiding action and the pumping action on the many fins or the groove walls, and is driven. It is possible to minimize the slippage on the side in an extremely short time after the engine is started, and to minimize it. Further, the function described above can be exerted by applying a fin or a groove wall to a torque transmission gap having a labyrinth mechanism.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a temperature-responsive fluid-type fan coupling device of the present invention, FIG. 1A is an enlarged sectional view of a main part of the embodiment of FIG. 1, and FIG. Figure 1 equivalent, second
FIG. A is an enlarged sectional view of a main part of the embodiment shown in FIG. 2, FIG. 3 is an enlarged cross-sectional view of a main part of the present invention according to still another embodiment, partially cut away, and FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, wherein (1) is a rotating shaft having a driving disk (7) fixed to the tip, and a cooling fan (F) is provided on the outer periphery of the rotating shaft via a bearing (B). ) Is mounted on a sealed casing consisting of a cover (3) with a case attached thereto and a case (2). (5) is a partition plate which divides the inside of the casing into an oil reservoir (6) and a torque transmission chamber (4) which houses the drive disk (7). The oil reservoir is on the partition plate. A hole (5 ') for adjusting oil outflow from the chamber (6) to the torque transmission chamber (4) is provided.
The drive disk (7) is located in the torque transmitting chamber (4) and has a small gap for transmitting torque between the opposing wall surface of the casing including the partition plate (5) near the outside thereof. Things. (8) is a valve member for opening and closing the outflow adjusting hole (5 '). One end of the valve member is attached to the surface of the partition plate (5) on the oil sump chamber (6) side, and the other end is connected to the outflow adjusting hole. And a supporting member (11) fixed to the front surface of the cover (3), and a temperature-sensitive body (10) made of a plate-shaped bimetal having both ends supported by a supporting member (11). It is provided inside through a connecting rod (9) so as to interlock with the.
(12) is a dam provided on a part of the inner peripheral wall on the side of the sealer box facing the outer peripheral wall of the drive disk (7) for collecting oil during rotation, which is located in front of the dam in the rotation direction. A circulation flow passage (13) is formed from the torque transmission chamber (4) side connected to the inflow port (13 ') near the oil reservoir chamber (6) to have a pumping function. Reference numeral (5 ") denotes a through hole provided in the center of the partition plate (5). In an embodiment having an idle oil reservoir described later, the oil reservoir (6) and the torque transmission chamber (6) are provided only when the engine is stopped. 4) and serves as a means for distributing.

(14) An annular idle oil which is located on the sealer box side and radially outward from the dam (12) and communicates with a torque transmission chamber (4) provided on an inner peripheral wall portion thereof as required. A sump chamber (FIG. 2) which is formed with a capacity substantially equal to the amount of oil already collected in the torque transmission chamber (4) and the idle oil sump chamber (14) when stopped. (16) is the first
As shown in detail in Fig. A, at least one side of the wall facing the outer periphery of the drive disk (7) on the side of the seal box, preferably with respect to the radial direction at that position formed by the seal box. It is provided with an angle (α) inclined in the rotation direction (see FIG. 4), and more preferably has a curved surface so as to form a receiving surface in the rotation direction. (16 ') in FIGS. 2 and 2A is a concave groove wall which is engraved at the same position as the fin (16).
It is formed to extend into the idle oil sump chamber (14). In the case where the torque transmission chamber (4) is formed by forming the labyrinth mechanism (FIG. 3) between the outer periphery of the drive disk (7) and the opposing wall surface of the casing, oil flow is poor. There are fins (16) or grooved walls (16 ') in the sealer box at least on the opposite side of the mechanism to prevent the oil temperature from rising and the rounding when restarting the engine. preferable. (15) are cooling fins protruding from the outside of the casing.

[Effects of the Invention] As described above, the temperature-responsive fluid-type fan coupling device according to the present invention includes a plurality of fins provided on the wall surface facing the outer peripheral edge of the drive disk (7) on the sealer box side. (16) Alternatively, due to the structure of the groove wall (16 '), the torque transmission gap is generated not only by the guide action as a guide vane and the centrifugal force due to the rotation but also by the pumping action by the fin or the groove wall during rotation. From the dam (1
2) It promotes oil supply to the side, and especially increases the pressure of the oil collected in the dam section to efficiently perform the dam function and prevent hunting, thereby increasing the flow in the gap. As a result, the control function is stabilized, and the time required for oil to pass through the torque transmission gap is shortened to shorten the time for receiving heat by receiving shear, thereby suppressing the temperature rise of the oil as much as possible. The oil is quickly and smoothly circulated and circulated smoothly to the outside to eliminate the fear of the cooling performance of the engine being reduced due to the viscosity change (decrease) of the oil. A more appropriate control function can be exhibited by following a change in ambient temperature, and if necessary, the above-mentioned idle oil sump chamber (14) can be provided, and the oil sump chamber (6) can be replaced with the idle oil sump chamber (14). 14) Insert the fin (16) or the groove wall (16 ') By the rapidity of the circulation flow of the oil by digit, becomes possible to reduce entanglement around to the driven side more effectively, it can be applied even to those of the torque transmission by the labyrinth mechanism or the like,
It is a very useful temperature sensitive fluid fan coupling device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a temperature-responsive fluid-type fan coupling device according to an embodiment of the present invention, FIG. 1A is an enlarged sectional view of a main part of the embodiment of FIG. 1, and FIG. Example 1
FIG. 2A is an enlarged sectional view of a main part of FIG. 2 embodiment,
FIG. 3 is an enlarged sectional view of a main part of the present invention according to still another embodiment, which is partially cut away, and FIG. 4 is a sectional view taken along line AA of FIG. (7) ... drive disk, (16) ... fin, (16 ')
…… groove wall

Claims (4)

(57) [Claims] An oil outflow adjusting hole is provided inside a housing of a sealer which is supported via a bearing on a rotary shaft having a drive disk fixed to the tip thereof and which has a cover and a cooling fan mounted on the outer periphery thereof. A partition plate having an oil sump chamber and a torque transmission chamber that houses the drive disk are separated by a partition plate having an inner peripheral wall surface on the sealer box side facing the outer peripheral wall portion of the drive disk in which oil is collected during rotation. A dam and a circulating flow passage extending from the torque transmitting chamber side to the oil sump chamber side in connection with the dam are formed, and when the temperature of the external environment exceeds a set value, the outflow adjusting hole of the partition plate is opened. A valve member that closes below a set value is provided inside so as to interlock with a deformation caused by a temperature change of a temperature sensing element provided on a front surface of the cover, and an opposing wall near an outer side of a drive disk and the case and the cover. Oil in the torque transmission gap In a fan coupling device in which the contact area is increased or decreased to control the transmission of torque from the rotary shaft side to the driven casing, the outer peripheral edge of the driving disk (7) on the sealed casing is controlled. A large number of radial fins (16) or concave groove walls (1
6 ′). A temperature-responsive fluid-type fan coupling device characterized in that it comprises: 2. The fin (16) or the groove wall (16 ').
2. The temperature-sensitive fluid-type fan according to claim 1, wherein the fan is formed radially at an angle (.alpha.) Inclined in a rotational direction with respect to a radial direction at the position of the casing.
Coupling device. 3. The fin (16) or the groove wall (16 ').
3. The temperature-sensitive fluid-type fan coupling device according to claim 1, wherein the drive disk (7) having a labyrinth mechanism is formed on a sealer box opposite to the labyrinth mechanism section. 4. An annular idle oil reservoir (14) communicating with a torque transmission chamber (4) is formed in a sealer box radially outward from the dam (12). To 3
The temperature-responsive fluid-type fan coupling device according to any one of the preceding claims.