JPS6238025Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature-sensitive fluid type fan coupling device in which a fan for cooling an automobile engine is attached and has a rotation control function. This relates to improving the structure formed between the dam and the dam.

In general, the structure formed by the drive disk and dam related to the pumping function in a conventional fan couple spring device is that the drive disk is disk-shaped and has a width and thickness surface on the outer periphery. Up until now, it has simply been constructed of dam pieces with flat surfaces that abut and engage with each other.
Therefore, due to the structure of abutting and engaging on mutually flat surfaces, the pumping function cannot be achieved in general, and naturally there is an amount of oil that cannot be delivered to the torque transmission chamber side. The presence of the engine will result in sufficient torque transmission, and the rotation that cannot be lowered will impede warm-up operation, resulting in wasted fuel and However, the current situation is such that it still cannot be done satisfactorily, as it causes fan noise, and improvements are desired.

However, the present invention solves this problem extremely effectively, and in detail with reference to the drawings below, the rotating shaft on the driving part side connects the sealing case (case 2 and case cover 3) as the driven side with bearing B. supported by
A partition plate 5 having an inflow adjustment hole 5' at the inner end of the rotating shaft divides the inside of the container into an oil reservoir chamber 6 and a torque transmission chamber 4, and is located on the side of the torque transmission chamber. A drive disk 7 is fixedly installed inside the case with minute gaps 4' and 4'' for torque transmission maintained between the inner wall and the opposing wall, respectively.
In particular, the outer periphery of the drive disk is structured as an outwardly tapered inclined wall 7'. Further, one end of the elastic valve member 8 is riveted to the side of the dividing plate 5, and the other end is provided on the side of the oil reservoir chamber 6 to open and close the inflow adjustment hole 5'. A plate-shaped bimetal 10 serving as a temperature sensing body is attached to both ends thereof, and a connecting rod 9 is connected to a valve member 8 to open and close an inflow adjustment hole 5' provided on a dividing plate 5.
It interlocks by abutting and engaging with. A dam piece 12 having a cutout groove 12' having the same slope as that of the inclined wall 7' on the outer circumference of the drive disk 7 is fitted and engaged, and the dam piece 12 has a cutout groove 12' having the same inclination surface as the inclined wall 7' on the outer circumference of the drive disk 7. The centrifugal force during the rotation causes the oil sump chamber 6 to be drawn from the torque transmission chamber 4 side, which is provided in the part where oil collects inside the container side.
It is provided in the vicinity of the rear side of the inlet 13' of the circulation passageway 13 communicating with the side, and is protrudingly engaged with the container case to provide a pumping function by delivering the liquid to the circulation passageway. 14 is a fan mounting bolt hole.

Incidentally, curve A shown in FIG. 6 shows the characteristic of the rotation control when the operation is on in general, curve B shows the characteristic when the coupling device according to the present invention is in the off state, and curve B' shows the characteristic when the coupling device according to the present invention is in the off state. This shows the characteristics of each rotation control.

As described above, according to the present invention, the outer periphery of the drive disk 7 has an outwardly pointed inclined wall 7' structure, and a cutout groove 12' having the same inverse shape as the inclined wall is provided. The dam piece 12 is fitted and engaged with the dam piece 12, and the dam piece 12 is located near the rear side of the inlet 13' of the circulation flow passage 13 with respect to the rotational direction of the drive disk 7, and protrudes and engages with the container case side. Therefore, the pumping function can be made even more effective due to the pointed inclined wall 7' structure and the reversely identical notch grooves 12' that extend over the side surface formed by the inclined wall. Alternatively, a small gap 4' for torque transmission on the torque transmission chamber 4 side in the operation off state such as in cold weather,
The amount of oil present in the 4" can be made as small as possible, effectively lowering the rotation at startup. This low rotation not only shortens warm-up time, but also reduces wasted fuel and reduces fan speed. It is also possible to more effectively reduce noise.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a temperature-sensitive fluid type fan coupling device according to an embodiment of the present invention, FIG. Figure 3 is a side view of the dam piece in Figure 1, and Figure 4 is a side view of the dam piece in Figure 1.
5 is a side view of the dam piece of FIG. 4, and FIG. 6 is a comparative characteristic curve diagram of the present invention and a conventional example. 7... Drive disk, 7'... Tapered inclined wall, 1
2...Dam piece, 12'...Notch groove, 13...Circulation flow passage, 13'...Inflow port.

Claims (1)

[Scope of utility model registration request] In order to control the rotation transmitted from the driving part to the driven part by the viscosity of the fluid according to changes in the external ambient temperature, a fan member is installed on the outside supported on the rotating shaft of the driving part. The interior of the sealing box, which consists of a case and a case cover, is divided into an oil reservoir chamber and a torque transmission chamber by a dividing plate, and an inflow adjustment hole provided on the dividing plate on the oil reservoir side. A valve member that opens and closes is installed internally so as to be interlocked with a temperature sensing element attached to the front of the cover on the front side of the container, and a drive disk fixed to the end of the rotating shaft is installed inside the container on the one side of the torque transmission chamber. A small gap for torque transmission is maintained between the peripheral wall and the opposing wall surface, and the effective contact area of the oil amount in the small gap increases or decreases according to a desired constant external temperature change, so that the drive disk rotates. A dam and a circulation flow passage that is sent out by the pumping function of the dam are connected from the torque transmission chamber side to the oil sump chamber side in the area where oil collects on the inside and outside of the container side due to centrifugal force. In a coupling device comprising:
The outer circumferential portion of the drive disk has a tapered outwardly inclined wall structure, and a dam piece which is fitted and engaged with a notch groove having the same slope as the inclined wall portion is attached to the drive disk. 1. A temperature-sensitive fluid type fan coupling device, characterized in that the device is provided near the rear side of the inlet of the circulation flow path with respect to the rotational direction of the flow path, and is configured to protrude and engage with the container casing side.