JPH0547867Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a temperature-sensitive fluid that controls the rotation of a fan for cooling an engine in a vehicle, and constantly supplies the engine with a cooling air volume that corresponds to the driving condition. This invention relates to improvements in type fan coupling devices.

[Prior Art] Conventionally, in this type of fan coupling device, the inside of a sealed container made of a cover and a case is separated into an oil sump chamber by a partition plate having a flow adjustment hole.
The drive disk is separated into a torque transmission chamber, and a circulation flow passage is provided connected to a pumping function section using a dam that connects from the torque transmission chamber side to the oil sump chamber side, and further includes an inlet and an outlet of the flow passage. so that at least one of them is located above the oil level existing in the oil sump chamber even when the rotation is stopped.
The outlet side was provided at the tip opening of a substantially semicircular groove connected to a circulation passage provided by holding a partition wall around the inner circumferential wall surface of the oil reservoir chamber.

[Problems to be Solved by the Invention] However, these conventional fan coupling devices have problems with oil sump that occurs during the stop when the circulating flow path side is submerged under the oil level in the oil sump chamber. This prevents oil in the room from accumulating in the torque transmission chamber due to natural backflow from the flow path toward the torque transmission chamber, prevents a sudden increase in fan rotation immediately after engine restart, and prevents abnormal fan noise. Although it satisfies the purpose of prevention and effective warm-up operation in cold weather, the condition of the valve member that opens the outflow adjustment hole of the partition plate during high-temperature operation is When the engine is stopped with the outflow adjustment hole side submerged under the oil level in the oil sump chamber, the torque transmission chamber side is caused by oil in the oil sump chamber naturally flowing out from the outflow adjustment hole while the engine is stopped. A large amount of oil will accumulate on the engine, and when the engine is subsequently restarted, the number of rotations of the fan on the driven side will increase over a certain period of time, resulting in the problem of so-called "slip rotation." It was something I had.

The present invention is more effective in preventing "twisting" on the driven side by limiting it to a very short period of time immediately after the engine starts, even when the engine is stopped in the high-temperature operating state. It is an object of the present invention to provide a temperature-sensitive fluid type fan coupling device that can reliably perform a pumping function of oil from the outer peripheral side of a transmission chamber to the circulation passage side.

[Means for Solving the Problem] The present invention is a sealed container that is supported via a bearing on a rotating shaft body having a driving disk fixed to the tip thereof, and is composed of a cover and a case with a cooling fan attached to the outer periphery. The interior is divided into an oil reservoir chamber and a torque transmission chamber in which the drive disk is housed by a partition plate having an oil outflow adjustment hole, and a seal facing the outer peripheral wall of the drive disk where oil collects during rotation. A dam is formed on a part of the inner circumferential wall surface on the container side, and a circulation flow path is formed in connection with the dam, which leads from the torque transmission chamber side to the oil reservoir chamber side, and when the external ambient temperature exceeds a set value, the partition plate A valve member that opens the outflow adjustment hole of the case and closes when the value is below a set value is provided inside so as to be linked to the deformation caused by the temperature change of the temperature sensing element provided on the front surface of the cover, and the drive disk, the case and the cover are connected to each other. A fan configured to increase or decrease the effective contact area of oil in a torque transmission gap provided on an opposing wall near the outside of the fan to control torque transmission from the rotating shaft side to the driven side of the sealing case side. - The coupling device includes an annular idle oil reservoir chamber located radially outward from the dam on the sealing case side and communicates with the torque transmission chamber through a flow gap, and A temperature-sensitive fluid-type fan is provided with a weir near the inlet near the dam, and further has through-holes in the partition plate through which oil flows between the oil reservoir chamber and the torque transmission chamber only when stopped. The gist is a coupling device.

[Example] Hereinafter, an embodiment of the present invention will be described based on the drawings. Fig. 1 is a longitudinal cross-sectional view of a temperature-sensitive fluid type fan coupling device of the present invention, and Fig.
This is an enlarged plan view with a cutout of a part of the vicinity of the dam, which constitutes the essential part of the present invention, in which 1 is a rotating shaft body with a drive disk 7 fixed to the tip, and a bearing B is mounted on the shaft body. It supports a sealing case consisting of a cover 3 and a case 2, to which a cooling fan (not shown) is attached on the outer periphery.

Reference numeral 5 denotes a partition plate that divides the inside of the sealing box into an oil reservoir chamber 6 and a torque transmission chamber 4 in which the drive disk 7 is housed. An oil outflow adjustment hole 5' is provided. The drive disk 7 is connected to the torque transmission chamber 4.
A minute gap is maintained between the opposite wall surface of the sealing case including the partition plate 5 for torque transmission. Reference numeral 8 denotes a valve member for opening and closing the outflow adjustment hole 5', one end of which is riveted to the wall surface of the partition plate 5 on the side of the oil reservoir chamber 6, and the other end positioned at the outflow adjustment hole. , a thermosensitive element 10 made of a plate-shaped bimetal whose both ends are engaged with a support fitting 11 fixed to the front surface of the cover 3 is inserted into the interior via a connecting rod 9 so as to be linked to the deformation caused by a change in the external ambient temperature. It's ready. Note that a spiral bimetal may be used in place of the plate-shaped bimetal, and the valve member 8 may be rotated to slide on the surface of the partition plate 5 to open and close the outflow adjustment hole 5'.

Reference numeral 12 denotes a dam provided on a part of the inner circumferential wall of the sealing case opposite to the outer circumferential wall of the drive disk 7 where oil collects during rotation, and is located near the dam in front of the dam in the rotational direction. A circulation flow path 13 is formed from the torque transmission chamber 4 side to the oil reservoir chamber 6 side connected to the inlet 13', and has a pumping function. 5'' is a circular through hole provided near the center of the partition plate 5, and is provided as a means for oil to flow between the oil reservoir chamber 6 and the torque transmission chamber 4 only when the engine is stopped. A plurality of dams 14 may be arranged on the same circumference from the axis. Reference numeral 14 is located radially outward from the dam 12 on the side of the sealing case and communicates with the torque transmission chamber 4 through a flow gap 14'. This is an annular idle oil reservoir chamber formed with a volume at least approximately equal to the amount of oil already collected in the torque transmission chamber 4 and the idle oil reservoir chamber 14 when the engine is stopped.

Reference numeral 15 denotes cooling fins that protrude radially from the outside of the sealing case. Reference numeral 16 denotes a substantially L-shaped weir provided in the idle oil reservoir chamber 14 near the inlet 13' near the dam 12, and the near side in the rotational direction of the flow gap 14' to the idle oil reservoir chamber 14 is located at one end. It consists of a protruding wall 16' that partially closes and/or a protruding wall 16'' that extends radially into the interior of the idle oil reservoir chamber 14,
The oil flowing on the inner circumferential surface of the torque transmission chamber 4 due to the rotation of the drive disk 7 is blocked by the weir 16, and the pressure on the upstream side of the weir is increased, thereby increasing the pressure immediately before the inlet 13', thereby increasing the circulation. This allows oil to be reliably delivered to the flow path 13 side.
In the illustrated embodiment, the radially projecting wall 16'' of the weir 16
Although there is a slight gap between the outer circumference of the idle oil reservoir chamber 14 and the inner circumference of the idle oil reservoir chamber 14, this gap may be eliminated and closed.

[Function] Since the present invention is configured as described above, an annular ring is provided which is located radially outward from the dam 12 on the sealing case side and communicates with the torque transmission chamber 4 through the flow gap 14'. An idle oil reservoir chamber 14 is provided, and a weir 16 is provided near the inlet 13' of the idle oil reservoir chamber 14 near the dam 12, and a weir 16 is provided in the partition plate 5 to provide an oil reservoir chamber 6 only when the engine is stopped. A through-hole 5″ through which oil naturally flows between and the torque transmission chamber 4.
Due to the structure, the through-hole 5'' provided in the partition plate 5 at the time of a stop allows the stop to be stopped even when a large amount of oil accumulates in the torque transmission chamber 4 after high-temperature operation. In the meantime, oil is allowed to flow naturally between the torque transmission chamber and the oil reservoir chamber side through the through hole 5'' to reduce the oil in the torque transmission chamber 4, and the presence of the idle oil reservoir chamber 14 Therefore, when the engine is subsequently started, the oil collected in the torque transmission chamber 4 is immediately released toward the idle oil reservoir chamber due to the centrifugal force on the oil that is generated as the seal casing rotates. Furthermore, the presence of the dam 16 dams up the oil flowing along the outer circumferential surface of the drive disk 7 and the inner surface of the torque transmission chamber 4, reducing the pressure of the oil at the inlet 13'. By raising the oil higher than the oil reservoir chamber 6, it is possible to reliably send the oil to the circulation passage 13 side.

[Effects of the invention] As explained above, the temperature-sensitive fluid type fan coupling device according to the invention has the through-hole 5''.
Due to the structure of the idle oil sump chamber 14 connected to the flow gap 14' that communicates with the torque transmission chamber 4, the oil in the torque transmission chamber 4 is immediately discharged toward the idle oil sump chamber 14 immediately after the engine is started. Since almost no oil remains in the torque transmission chamber 4, it is possible to more effectively prevent the "twisting" that occurs on the driven side immediately after starting the engine, and therefore prevent the engine from stopping under high temperature operating conditions. In addition to preventing abnormal fan noise and promoting warm-up operation by preventing a sudden increase in fan rotation when the engine is subsequently started, the engine can more effectively prevent the above-mentioned "running around". Furthermore, due to the presence of a weir 16 provided in the idle oil reservoir chamber 14, during subsequent operation, the oil flowing on the inner peripheral surface of the torque transmission chamber 4 due to the rotation of the drive disk 7 is circulated by the effect of the weir. This is an extremely useful temperature-sensitive fluid-type fan coupling device that can reliably deliver air to the airway 13 side and control fan rotation in response to changes in external temperature.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a temperature-sensitive fluid type fan coupling device according to an embodiment of the present invention, and FIG.
The figure is a partially cutaway plan view of the vicinity of the dam, which constitutes the main part of the present invention shown in FIG. 4...torque transmission chamber, 5...partition plate, 5''...
Penetration, 6...Oil sump chamber, 12...Dam, 13'...
...Inflow port, 14...Idle oil reservoir chamber, 14'...
...Flow gap, 16...weir.

Claims (1)

[Scope of utility model registration request] The inside of the sealed container, which is supported via a bearing on a rotating shaft body with a drive disk fixed to the tip and consists of a cover and a case with a cooling fan attached to the outer periphery, is controlled by a partition plate having oil outflow adjustment holes. It is divided into an oil reservoir chamber and a torque transmission chamber in which the drive disk is housed, and a dam is installed on a part of the inner circumferential wall on the sealing case side facing the outer circumferential wall of the drive disk where oil collects during rotation. In conjunction with this, a circulation flow path is formed that leads from the torque transmission chamber side to the oil reservoir chamber side, and when the external ambient temperature exceeds a set value, the outflow adjustment hole of the partition plate is opened, and when it is below the set value, it is closed. A torque transmission gap is provided on an opposing wall surface near the outer side between the drive disk and the case and cover, and a valve member is provided inside so as to be linked to the deformation caused by a temperature change of a temperature sensing element provided on the front surface of the cover. In the fan coupling device, the torque transmission from the rotating shaft side to the driven side of the seal case is controlled by increasing or decreasing the effective contact area of oil at the dam 12 on the seal case side. An annular idle oil reservoir chamber 14 is provided which is located further outward in the radial direction and communicates with the torque transmission chamber 4 via a flow gap 14'.
A weir 16 is provided near the inlet 13' of the idle oil sump chamber 14 near the dam 12, and the partition plate 5 allows oil to flow between the oil sump chamber 6 and the torque transmission chamber 4 only when the idle oil sump chamber 14 is stopped. A temperature-sensitive fluid type fan coupling device characterized in that it has a through hole 5''.