JPH0324905Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a temperature-sensitive fluid system that controls the rotation of a fan generally used for engine cooling in automobiles to constantly supply cooling air to the engine according to the driving conditions. This invention relates to improvements in the performance characteristics of rotational control in fan coupling devices.

[Prior Art] Conventionally, in this type of fan coupling device, for example, as shown in FIG. 5, a drive disk 36 fixed to the tip of a rotating shaft body has a relatively narrow outer peripheral end with a width _l3 . Because it is formed from a disk shape,
The width of the dam 32 corresponding to the outer peripheral end of this narrow width _l3 is also narrow, and the circulation path 33 leading from the torque transmission chamber 34 side adjacent to the dam to the oil reservoir chamber is also formed to have a small diameter. It was hot. Note that 35 is the torque transmission interval.

[Problems to be Solved by the Invention] However, in such a conventional fan coupling device, the above-mentioned dam ₃₂ and Due to the structure of the circulation path 33, the pumping function from the torque transmission chamber 34 to the oil reservoir chamber side cannot be achieved sufficiently, and therefore the torque transmission chamber 3
When restarting the engine after stopping the engine, in which almost the entire amount of oil naturally collects on the 4 side, due to the insufficient pumping function, as shown in the performance characteristic curve B of Fig. 6, The fan is forced to rotate at high speed over a certain period of time, and this tendency becomes especially noticeable in winter when the temperature is low and cold, hindering warm-up operation and having a negative impact on the engine. This had the problem of inducing noise. In order to extremely effectively solve these conventional problems, the present invention has been developed by bending the side wall surface of the outer peripheral end of the drive disk in one or both of the front and rear directions to form an L-shaped or T-shaped cross section. forming an annular projecting wall, having an oil escape hole passing through the projecting wall to the circulation path side through a dam, and providing the width of the dam corresponding to the entire width of the projecting wall on the drive disk side; Furthermore, an oil communication hole between the front and rear torque transmissions is bored in the drive disk inside the protruding wall near the relief hole, and an oil communication hole is formed near the bent base of the protrusion wall and rotates from the relief hole. By providing at least one dam member at the front position in the direction, the pumping function from the torque transmission chamber to the oil sump chamber side is fully demonstrated as soon as possible when the engine is started, and the pumping function is fully exerted as soon as possible when the engine is started. It prevents the fan from rotating at high speed for a long period of time to prevent abnormal fan noise from occurring, and also reduces the negative impact on the engine by effectively warming up the engine during low temperatures and cold weather in the winter.
The purpose of the present invention is to propose a fan coupling device that can prevent the occurrence of fan coupling.

[Means for Solving the Problem] The present invention provides a sealing device that is supported via a bearing on a rotating shaft body having a drive disk fixed to its tip, and is made up of a cover and a case with a cooling fan member attached to the outer periphery. The interior of the box is divided into an oil reservoir chamber and a torque transmission chamber in which the drive disk is housed, by a partition plate having oil outflow adjustment holes, and an outer periphery of the drive disk in which oil collects during rotation. A dam is formed on a part of the inner circumferential wall surface on the side of the sealing case facing the wall, and a circulation path leading from the torque transmission chamber side to the oil sump chamber side is formed in connection with the dam, and the outside ambient temperature is maintained at a set value. A valve member that opens the outflow adjustment hole of the partition plate when the temperature exceeds the set value and closes the outflow adjustment hole when the temperature exceeds the set value is provided inside so as to be linked to the temperature change of the temperature sensing element, and the drive disk is opposed to the case and the cover. A fan that controls the transmission of rotational torque from the rotating shaft on the drive side to the sealing box side on the driven side by increasing or decreasing the effective contact area of oil between the torque transmission areas formed on the wall surface.
In the coupling device, the side wall surface of the outer peripheral end of the drive disk is bent to have an L-shaped cross section or a T-shaped cross section.
The projecting wall is formed into an annular projecting wall with an annular shape, and an oil escape hole passing through the dam to the circulation path side is provided in the projecting wall, and the width of the dam is equal to the width of the entire projecting wall on the drive disk side. Further, an oil communication hole between the front and rear torque transmission areas is bored in the drive disk inside the protruding wall near the relief hole, and near the bent base of the protruding wall. The gist of the present invention is a temperature-sensitive fluid type fan coupling device, which is configured by providing at least one dam member at a position before the escape hole in the rotational direction.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. Fig. 1 is a partially cutaway vertical sectional view of the temperature-sensitive fluid type fan coupling device of the present invention, and Fig. 2 is a longitudinal sectional view of the temperature-sensitive fluid type fan coupling device of the present invention. An enlarged view of the main parts of Figure 1, Figure 3 is Figure 2A
4 is a partially cutaway sectional view of the vicinity of the dam along line A, and FIG. 4 is a view corresponding to FIG. 2 according to another embodiment. It is a rotating shaft body having a flange wall 1' for attachment to the base body, on which a case 2 is supported by a bearing B, and the front surface of the case is sealed with a cover 3 so that the outer periphery is connected to the driven side. It constitutes a sealing case to which a cooling fan member F is attached. Reference numeral 5 designates 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 outflow adjustment hole 5' is provided. 7' or 7'' is formed on the side wall surface of the outer peripheral end of the drive disk 7 and has an L-shaped cross section bent in one direction in the front-rear direction (FIG. 2), or a T-shaped cross section bent in both directions (FIG. 4). ), each having a width l ₁ (see Fig. 2) and a width l ₂ (see Fig. 4). 8 is a valve member for opening and closing the outflow adjustment hole 5'. One end is riveted to the surface of the partition plate 5 on the side of the oil sump chamber 6, and the other end is located at the outflow adjustment hole 5', and a supporting metal fitting fixed to the front surface of the cover 3 is provided. The temperature sensor 10, which is made of a plate-shaped bimetal whose both ends are connected to the temperature sensor 11, senses the external ambient temperature, and is operated by a linking rod 9 that moves in conjunction with the curved deformation that occurs as the temperature changes. Reference numeral 12 denotes a dam having a pumping function, which is provided on a part of the inner circumferential wall surface on the side of the cover 3 where oil collects, which faces the outer circumferential end wall surface of the drive disk 7. A circulation path 13 is formed which leads from the torque transmission chamber 4 side having an inlet to the oil reservoir chamber 6 side.The width of the dam 12 is equal to the entire width l ₁ of the protruding wall 7' or 7'' of the drive disk 7.
or l ₂ , and the circulation path 1
3 as a large path. Reference numeral 14 or 14' indicates an oil escape hole provided through the protruding wall 7' or 7'', which communicates with the circulation path 13 through the dam 12. Reference numeral 15 or 15' indicates an oil escape hole 14 or 14'. This is an oil outflow guiding groove formed in the radial direction of the torque transmission surface on one or both sides of the drive disk 7 in the longitudinal direction.
Reference numeral 16 designates an oil communication hole between the front and rear torque transmitters, which is bored in the drive disk 7 near the relief hole 14 or 14' and inside the protruding wall 7' or 7''. At least one dam member provided at a part of the inner wall surface near the bent base of the protruding wall 7' or 7'' and at a position before the relief hole 14 or 14' in the rotational direction, and is a dam member in FIG. The member 17 is provided at the bottom between each labyrinth in the radial direction.
Reference numeral 18 denotes cooling fins protruding from the outer surface of the sealing case.

[Operation] Since the present invention is constructed in this way, the sufficient width l ₁ or l ₂ of the protruding wall 7' or 7'' of the drive disk 7 allows the dam 1 to be
The pumping function in step 2 can be efficiently demonstrated, and the relief hole 14 or 1
4' and near the bent base of the protruding wall 7' or 7'' and the escape hole 14 or 14'.
At least one dam member 17 or 17' provided at a position closer to the rotational direction prevents the centrifugal force generated as the drive disk 7 rotates after the engine is started and the oil in the torque transmission chamber 4 caused by the dam member. By the scraping action, the oil collected on the torque transmission chamber 4 side is sent out to the dam 12 side through the relief hole 14 or 14' as quickly as possible. On the other hand, the oil communication hole 16 between the front and rear torque transmission areas, which is bored near the outside of the outflow guide groove 15 or 15', allows the oil to flow through the front and rear torque transmission areas even if it has a labyrinth-type torque transmission surface. The level of the oil collected in the torque transmission chambers 4 before and after the drive disk 7 is made the same, thereby eliminating the problem of torque transmission due to oil remaining in either the front or rear torque transmission chambers due to the unevenness of the levels, As shown in the performance characteristic curve A in FIG. 6, the fan rotation speed is rapidly lowered.

[Effects of the Invention] As explained above, the temperature-sensitive fluid type fan coupling device according to the present invention has the following features: The dam 12 and the circulation path 13 corresponding to the wall part, more preferably the outflow guide groove 15 or 15' communicating with the relief hole 14 or 14', the communication hole 16, and the dam member 17 or 17'. When the engine is restarted after the engine has stopped, in which the entire amount of oil naturally collects on the torque transmission chamber 4 side, the above-mentioned structural requirements allow the centrifugal force accompanying the rotation of the drive disk 7 and the collected oil to be transferred to the dam. member 17 or 17'
Due to the oil scraping action of It prevents abnormal fan noise by preventing the fan from rotating at high speed for a certain period of time immediately after startup, and also makes warm-up operation even more effective during low temperatures and cold weather in the winter, reducing concerns about negative effects on the engine. Extremely useful temperature-sensitive fluid fan that can be eliminated
It is a coupling device.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway vertical sectional view of a temperature-sensitive fluid type fan coupling device showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a second A partially cutaway cross-sectional view of the vicinity of the dam along line A-A,
Fig. 4 is a diagram corresponding to Fig. 2 according to another embodiment, Fig. 5 is an enlarged vertical cross-sectional view of a part of the conventional example due to a notch, and Fig. 6 is a comparative performance characteristic curve diagram of the present invention and the conventional technology. It is. 7...Drive disk, 7' or 7''...Protruding wall, 12...Dam, 13...Circulation path, 14 or 14'...Escape hole, 16...Communication hole, 17 or 17'...Dam member .

Claims (1)

[Scope of utility model registration request] The inside of the sealed container is made up of a case and a cover, which is supported via a bearing on a rotating shaft body with a drive disk fixed to its tip, and a cooling fan member is attached to the outer periphery. An oil reservoir chamber and a torque transmission chamber containing the drive disk are separated by a plate, and an inner peripheral wall surface on the sealing case side facing the outer peripheral wall of the drive disk where oil collects during rotation is divided by a plate. forming a dam in part and a circulation path leading from the torque transmission chamber side to the oil reservoir chamber side connected to the dam, and opening the outflow adjustment hole of the partition plate when the external ambient temperature exceeds a set value; A valve member that closes when the temperature is below a set value is provided internally in response to changes in the temperature of the temperature sensing element, and the oil is effectively used between the torque transmission gap formed on the opposing wall surface between the drive disk and the case and cover. In a fan coupling device that increases or decreases the contact area to control the transmission of rotational torque from the rotating shaft on the driving side to the sealing case on the driven side, the side wall surface of the outer peripheral end of the driving disk is bent to form a cross section L. An annular protruding wall having a shape of a letter or a T-shape is formed, and an oil escape hole communicating with the circulation path through the dam is provided in the protruding wall,
In addition, the width of the dam is set to correspond to the entire width of the protruding wall on the drive disk side, and furthermore, the width of the dam is set to correspond to the entire width of the protruding wall on the drive disk side, and furthermore, the oil is prevented from flowing into the drive disk between the front and rear torque transmission areas on the inside of the protruding wall near the relief hole. Along with drilling a communication hole,
A temperature-sensitive fluid type fan coupling device characterized in that at least one dam member is provided near the bent base of the protruding wall and at a position before the relief hole in the rotational direction.