JPH0660659B2 - Temperature-sensitive fluid type fan coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention generally controls a fan rotation for engine cooling in an automobile so as to follow the temperature change around the engine to constantly control the cooling air flow rate according to the running state. The present invention relates to a temperature-sensitive fluid type fan / coupling device which is automatically adjusted and supplied to an engine.

[Prior Art] Conventionally, this type of fan coupling device is the seventh
As illustrated in the drawing, a partition plate having an outflow adjusting hole (24 ') is formed inside the sealer case by the cover (23') and the case (23 ').
(24) separates the oil sump chamber (25) and the torque transmission chamber (26) that houses the drive disk (22), and also the torque transmission chamber (26)
A circulation flow passage (27) is provided so as to be connected to a pumping function part by a dam (28) which communicates with the oil reservoir chamber (25) further, and further, an inlet (27 ′) and an outlet (27 ″) of the flow passage side are provided. The outlet (27 ″) is provided so that at least one of them is located above the oil level present in the oil sump chamber (25) in any stopped state.
The side is provided at the tip opening of the arc-shaped grooved channel (29) which is a semicircle connected to the circulation flow channel (27) provided with a partition wall around the inner peripheral wall of the oil sump chamber (25). It had been.

[Problems to be Solved by the Invention] However, these conventional fan coupling devices are stopped when the circulation flow passage (27) side is stopped under the oil level in the oil sump chamber (25). Between the torque passage chamber (26) by natural backflow from the flow passage due to the oil in the oil sump chamber between the torque transmission chamber (26) side to prevent accumulation of the fan rotation immediately after engine start. Although it is possible to prevent the generation of abnormal fan noise and effectively achieve warm-up operation in cold weather, the objectives are achieved,
When the engine was restarted, there was a tendency that the phenomenon of "creeping around" over a certain period of time lacked the function of reducing or preventing it.

That is, the outflow adjusting hole (2
4 ′) in the state of the valve member which is open, when the engine is stopped by submerging the outflow adjusting hole side under the oil surface of the oil sump chamber (25),
While the vehicle was stopped, a large amount of oil was collected on the torque transmission chamber (26) side due to spontaneous outflow of oil from the oil sump chamber through the outflow adjusting hole (24 '), so the engine was restarted after a certain time. In this case, as shown in the performance characteristic curve (b) of FIG. 8 over a certain period of time, there was a problem of causing the above-mentioned "surrounding" on the driven side. Furthermore, since the seal box is located on the driven side, the use of high-load bearings is possible due to the structure of the weight body on the seal box side with the fan (F) attached and its large moment of inertia. Therefore, there was a tendency to increase the product weight.

In addition, since the temperature sensor is attached near the front surface of the cover (23 '), it is easily affected by heat from the cover (23') in connection with the structure of the seal box made of a normal aluminum alloy material. There is a tendency that there is a problem in that the deformation of the temperature sensitive body that follows the temperature change of the outside environment is distorted and hysteresis is caused in the rotation control characteristic.

The present invention solves such a conventional problem and prevents abnormal fan noise from occurring due to the prevention of a sudden increase in fan rotation immediately after the engine is started, and also has a function of promoting warm-up operation. Is provided on the drive side, and is further positioned radially outward of the dam on the sealer case side, and is provided with an idle oil sump that communicates with the torque transmission chamber, and the partition plate is filled with oil only when stopped. Centrifugation to oil caused by rotation of the sealer casing side due to subsequent engine start even when stopped at the high temperature operating state by having a circulation means for communicating the reservoir chamber and the torque transmission chamber The force causes the oil that has collected in the torque transmission chamber to be immediately discharged toward the idle oil storage chamber, leaving almost no oil remaining in the torque transmission chamber. Extremely short time immediately after starting In addition, the cooling fan is attached to the shaft core opening on the front cover side of the sealing box via a bearing in relation to the structure of the sealing box on the driving side, and the driven side is made of iron material. By supporting and configuring the rotating member, the load on the driven side with the cooling fan attached can be reduced, and the moment of inertia can be reduced to enable the use of light load bearings. The high-speed rotation state promotes the cooling effect, and the heat generation part,
For example, since the rotary member can be provided apart from the torque transmission gap and the oil reservoir, the heat transfer path can be made sufficiently long, and the bearing and the rotary member can use an iron material or the like having low thermal conductivity, (EN) Provided is a fan-coupling device which does not cause a problem in rotation controllability due to heat radiation from a cover and heat transfer from a rotating member to a cooling fan and a temperature sensing element even when the temperature of internal oil rises. It is intended.

[Means for Solving the Problem] According to the present invention, the effective contact area of oil in the torque transmission gap between the driving side and the driven side is increased / decreased in response to a change in the temperature of the outside environment, and the driven side is increased. In a fluid type fan / coupling device that controls the transmission of rotation to the case, a seal box made up of a case and a case cover is driven to rotate, and a temperature-sensing element is attached to the front side of the shaft cover opening on the case cover side through a bearing. An outer side of the driven disk is supported by supporting a shaft base of a rotating member having a body and a cooling fan attached to the outside, and fixing a driven disk at a rear end of the rotating member located inside the sealer case. A torque transmission gap is maintained between the inner periphery and the opposing inner peripheral surface on the side of the sealer, and the circular recessed groove portion on the back side of the driven disk is divided by a partition plate to form an oil reservoir and the torque transmission gap. Forming a torque transmission chamber that communicates The partition plate is provided with an oil outflow adjusting hole that communicates with the torque transmission chamber side from the oil sump chamber, and the oil sump chamber is interlocked with a connecting rod that follows deformation due to temperature change of the temperature sensing element. A valve member for opening and closing the outflow adjusting hole is internally provided, and a dam is provided on a part of the outer peripheral surface of the driven disk that collects oil during rotation so as to project toward the inner peripheral surface of the opposing seal box. In the vicinity of the dam in the direction of rotation thereof, there is also provided an oil circulation passage communicating from the torque transmission gap portion radially penetrating the inside of the driven disk to the oil reservoir chamber side, and further the sealer. An idle oil sump chamber communicating with the torque transmission chamber is provided radially outward of the dam on the box side, and the partition plate allows the oil to flow between the oil sump chamber and the torque transmission chamber only when stopped. Sensitive Fluid Fan Coupling Device Having Means Further, the circulation means is constituted by a circular through hole provided in the center of the partition plate, or a plurality of through holes provided by arranging a plurality of them on the same circumference from the axis of the partition plate. It was done.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway vertical sectional view of a temperature sensitive fluid type fan / coupling device of the present invention, and FIG. FIG. 1 is an enlarged view showing the oil collecting state when stopped, and FIG. 3 is a low temperature view of FIG.
That is, an explanatory view showing an oil collecting state when starting and operating in the off state, and FIG. 4 is a state of collecting oil when starting and operating at the high temperature in FIG. 2, that is, in the on state. 5 is a plan view of the partition plate alone taken along the line AA in FIG. 5, and FIG. 5 is a plan view of the case (2). ′) And a case cover (2 ″), which is a rotary drive including a casing (2), which is made of an aluminum alloy or the like, and the casing (2) is connected to the case (2 ′) side. It may be formed integrally or may be provided separately.
(5) is a rotating member having a shaft core base supported by a bearing (4) in a shaft opening (3) on the case cover (2 ″) side,
A temperature sensitive body (13) made of bimetal or the like is attached to the front surface, and a cooling fan (6) is attached to the outside to constitute the driven side. (8)
Is a driven disk fixed to the rear end of the rotary member (5) located inside the seal box (2), and is close to its outer side, that is, at least one side surface or outer peripheral end surface and the seal box. A torque transmission gap (7 ') is held between the opposing inner peripheral surfaces on the (2) side. (10) is a torque transmission that communicates with the oil storage chamber (11) and the torque transmission gap (7 ') by defining a circular groove (9) around the center on the back side of the driven disk (8). A partition plate that forms a chamber (7), and the partition plate is provided with an oil outflow adjustment hole (12) that communicates from the oil sump chamber (11) to the torque transmission chamber (7) side. (14) is a valve member installed in the oil sump chamber (11), the temperature sensing element (13) is deformed by the temperature change of the outside surroundings, of the rotating member (5) movable following the deformation. The outflow adjusting hole (12) on the side of the partition plate (10) is opened / closed by interlocking with a connecting rod (17) formed by penetrating a shaft portion. (15) is a dam provided on a part of the outer peripheral surface of the driven disk (8) where the oil is collected during rotation, protruding toward the inner peripheral surface side of the opposing seal box (2),
6) is an oil sump chamber (11) from the torque transmission gap (7 ') which is provided in the vicinity of the dam (15) by radially penetrating the inside of the driven disk (8) in the front in the rotational direction. ) Side is a circulation passage of oil.

(18) is, for example, an annular idle oil sump chamber located outside the dam (15) on the side of the sealer box (2) in the radial direction and provided to the torque transmission chamber (7), and is stopped. Sometimes torque transmission chamber (7)
And a volume substantially equal to the amount of oil collected in the idle oil sump (18). Reference numeral (19) is a distribution means consisting of a through hole provided in the partition plate (10), which allows the oil to communicate with the oil reservoir chamber (11) and the torque transmission chamber (7) only when the partition plate is stopped. A single circle at the center of (10) (see FIG. 1), or a plurality of the circles arranged on the same circumference from the axis of the partition plate (No. 5)
(See FIG. 6 and FIG. 6).

The temperature sensor (13) has a rectangular flat plate shape (first
The valve member (14) is moved forward and backward with respect to the outflow adjusting hole (12) to open and close in accordance with the curved deformation in the front-back direction, or a spiral ( The valve member (14) formed in FIG. 5) and slid to the left and right with respect to the outflow adjusting hole can be used for opening and closing.

[Operation] Since the present invention is configured in this manner, the seal box (2)
And a cooling fan (6) attached to the shaft core opening (3) of the front wall portion (case cover (2 ″)) on the side of the sealed container by mounting the cooling fan (6) through the bearing (4). Due to the structure in which the rotating member (5) as the driving side is supported and the driven disk (8) is located on the driven side, the driven side can be formed extremely lightweight and the sealing device provided as the driving side. Depending on the state of high speed rotation on the box (2) side, the cooling effect of the enclosure box itself will be remarkably promoted, and further through the bearing (4) and rotating member (5) of iron material or the like having a low thermal conductivity. Cooling fan (6) and temperature sensor
Due to the structure in which the (13) is attached, the heat generated inside the enclosure (2) will not affect the fan and the temperature sensor, and the dam on the enclosure (2) side will be eliminated. (15) The idle oil sump chamber (18) provided outside in the radial direction.
And the oil sump provided only on the partition plate (10) when stopped
(11) and the torque transmission chamber (7), the structure of the circulation means (19) by the through hole that allows oil to communicate naturally, the torque transmission chamber after high temperature operation
(7) Even when stopped in the state where a large amount of oil collects,
During the suspension, the torque transmission chamber side is naturally communicated with the oil sump chamber (11) through the flow means (19), and is already collected in the torque transmission chamber (7) and the idle oil sump chamber (14). Due to the structure of the idle oil sump chamber (18) formed with a volume approximately equal to the amount of oil, the torque transmission chamber (7) is generated by the centrifugal force to the oil generated by the rotation of the seal box (2) side at the time of subsequent engine start. ), The oil collected in the idle oil sump chamber (18) is immediately discharged and stored in the idle oil sump chamber, so that almost all of the oil remains in the torque transmission chamber (7). The result is not. The above state is shown in FIG. 8 as a performance characteristic curve (a).

[Effects of the Invention] As described above, in the temperature-sensitive fluid type fan / coupling device according to the present invention, the seal box (2) is rotationally driven, and the driven disk (8) is provided on the driven side. With this structure, the weight of the driven side can be reduced, the moment of inertia can be reduced, the load on the driven bearing (4) can be reduced, and its life can be extended. This is not possible.Furthermore, since the sealing box (2) itself can remarkably promote the cooling effect and iron material having low thermal conductivity can be used for the bearing (4) and the rotating member (5), use of a fan made of resin alone Is possible, and by taking the heat transfer path sufficiently long,
Even when the temperature of the internal oil rises, it is possible to eliminate the fear of the thermal effect on the temperature sensitive body (13) and to exhibit the control characteristics with a high responsiveness that constantly follows the ambient temperature change. Since (18) is provided, the oil in the torque transmission chamber (7) is immediately discharged toward the idle oil sump chamber immediately after the engine is started and stored, and almost no oil remains in the torque transmission chamber (7). Depending on the state, it is possible to keep the "slip around" to the driven side in an extremely short time immediately after the engine starts, prevent a sudden rise in fan rotation, prevent abnormal fan noise, and promote warm-up operation. Thus, it is an extremely useful temperature-sensitive fluid type fan / coupling device capable of effectively preventing the above-mentioned "surrounding".

[Brief description of drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a temperature-sensitive fluid type fan / coupling device showing an embodiment of the present invention, and FIG. 2 is an enlarged view showing a state of collecting oil when stopped in FIG. Fig. 3 is an explanatory view showing the oil collecting state at the low temperature start and the low temperature operation of Fig. 2, and Fig. 4 is an explanatory view showing the oil collecting state at the high temperature start and the high temperature operation. 5, FIG. 5 shows another embodiment, which is equivalent to FIG. 1 of the same as above, FIG. 6 is a plan view of a partition plate alone taken along line AA in FIG. 5, and FIG. 7 is a fan coupling device showing a conventional example. FIG. 8 is a longitudinal sectional view of FIG. 8 and FIG. 8 is a comparative performance characteristic curve diagram of the present invention and the prior art. (1) …… Rotary drive, (2) …… Enclosure box, (2 ′) …… Case, (2 ″) …… Case cover, (3) …… Shaft core opening, (4)
...... Bearing, (5) …… Rotating member, (6) …… Cooling fan, (7)
...... Torque transmission chamber, (7 ′) …… Torque transmission gap, (8) ……
Driven disk, (9) …… Concave groove, (10) …… Partition plate, (11)
…… Oil sump chamber, (12) …… Spill adjustment hole, (13) …… Sensor,
(14) …… Valve member, (15) …… Dam, (16) …… Circulating flow passage,
(17) …… Link, (18) …… Idle oil sump, (19) …… Distribution means

Claims (3)

[Claims] 1. A fluid for controlling rotation transmission to a driven side by increasing / decreasing an effective contact area of oil in a torque transmission gap between a driving side and a driven side in response to a temperature change of an outside environment. In a fan-coupling device of the type described above, a sealing box (2) consisting of a case (2 ′) and a case cover (2 ″) is rotationally driven, and an axial core opening (3) on the case cover (2 ″) side is provided. The bearing
While supporting the shaft core base of the rotating member (5), which is equipped with the temperature sensor (13) on the front side and the cooling fan (6) on the outside via (4), inside the seal box (2). By fixing the driven disk (8) at the rear end of the rotating member positioned, a torque transmission gap (7 ') is provided between the outer side of the driven disk and the facing inner peripheral surface on the side of the sealer case (2). The oil holding chamber is held by further holding and further dividing the circular concave groove portion (9) on the back side of the driven disk (8) by the partition plate (10).
(11) and the torque transmission chamber that communicates with the torque transmission gap (7 ')
(7) is formed, and the partition plate is provided with an oil outflow adjusting hole (12) communicating with the torque transmission chamber (7) side from the oil reservoir chamber (11), and inside the oil reservoir chamber (11). The outflow adjusting hole is linked with the connecting rod (17) that follows the deformation due to the temperature change of the temperature sensing element (13).
A valve member (14) for opening and closing (12) is incorporated, and further on a part of the outer peripheral surface of the driven disk (8) for collecting oil during rotation,
A dam (15) is provided so as to project to the inner peripheral surface side of the opposing seal box (2), and the inside of the driven disk (8) is radially penetrated in the vicinity of the dam and at the front part in the rotation direction thereof. An oil circulation passage (16) communicating with the oil reservoir (11) side from the torque transmission gap (7 ') is also provided, and the dam (15) on the seal box (2) side is further provided.
Located at the outer side in the radial direction, an idle oil sump chamber (18) communicating with the torque transmission chamber (7) is provided, and the partition plate (1
In (0), the oil remains in the oil sump chamber (11) and torque transmission chamber (7) only when stopped.
A temperature-sensitive fluid type fan / coupling device, characterized by having a flow means (19) for communicating with. 2. A temperature-sensitive fluid according to claim 1, wherein the flow means (19) is constituted by a circular through hole provided in the center of the partition plate (10). Fan coupling device. 3. The distribution means (19) according to claim 1, wherein the circulation means (19) is formed by a plurality of through-holes arranged on the same circumference from the axis of the partition plate (10). A temperature-sensitive fluid type fan / coupling device characterized in that