JPH051697Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a coupling device using viscous fluid that is applied to a cooling fan of a vehicle internal combustion engine and various drive devices.

(Prior Art) There are two types of fluid coupling devices of this type: a torque limit type and a temperature sensitive type. ing. In a typical structure of a hydraulic coupling device, a sealed case is mounted via a bearing on a rotary drive shaft that has a drive disk (wheel) at the tip and a flange portion for connecting to the end face of the water pump of the engine at the rear end. A working chamber which is supported to be relatively rotatable and introduces viscous fluid into the sealed case, an oil reservoir chamber which accommodates the viscous fluid from the working chamber via a return passage, and an oil reservoir chamber which directs oil from the working chamber to the return passage. A dam member is provided, and the presence of viscous fluid in the gap between the wall surface of the drive disk and the inner wall surface of the sealed case creates shear resistance and transmits torque.

A sealed case is generally assembled with a cover and a body, each of which has cooling fins on its outer surface that are integrally molded by die-casting from aluminum and protrude from the outer surface of the sealed case. restraining the rise.

Generally, the sealed case is the output side where rotation from the rotary drive shaft (input side) is intermittent, and it rotates at high speed when the coupling is on (when the engine is at high temperature), and when the coupling is off (when the engine is at low temperature). It simply rotates at a low speed due to bearing friction. Therefore, in the OFF state, there is no oil on the torque transmission surface and its temperature rise is almost no problem, but in the ON state, the torque transmission surface is filled with oil, and the gap between the drive disk and the sealed case causes oil to rise. The oil exerts shear resistance and generates heat, and this heat generation is quite large, so even if the sealed case rotates at high speed, the heat dissipation is not sufficient, causing the temperature of the silicone oil to rise and the viscosity to decrease. A situation has arisen in which the torque is reduced.

For this reason, it is necessary to use a large-sized coupling device with a large torque that has a considerable margin compared to the design-required transmission torque (torque transmission area), resulting in an increase in space, fan noise, and
There were problems such as decreased efficiency and increased costs. In addition, there were other problems such as deterioration of silicone oil due to heat and shortened lifespan of various heat-resistant parts.

(Problem to be solved by the invention) The purpose of the invention is to provide a cooling passage for the viscous fluid to suppress its temperature rise and prevent a decrease in viscosity, and to reduce the size of the coupling by suppressing variations in the transmitted torque. The object of the present invention is to provide a fluid coupling device that can be used in various ways.

Another object of the present invention is to prevent deterioration of viscous fluid and improve the durability of various heat-resistant parts by increasing the cooling effect of the entire coupling.

(Means for Solving the Problems and Their Effects) The above-mentioned object of the present invention is to provide a general fluid coupling device in which a second dam member is disposed on the outer peripheral end surface of the drive disk, and a second dam member is disposed inside the drive disk. a first circulation passage extending from a position adjacent to the second dam member to the outer surface of the drive shaft; and a second circulation passage communicating with the first circulation passage and extending inside the drive shaft to the flange portion. and a third circulation passage extending from the flange portion to the inside of the drive shaft and opening into the working chamber or oil reservoir chamber,
A fluid type configured such that the viscous fluid sent into the first circulation passage by the second dam member passes through the second and third circulation passages and returns to the working chamber or the oil sump chamber. This is accomplished by a coupling device.

Based on this configuration, according to the present invention, a portion of the silicone oil flows through the first, second, and third circulation passages and comes into contact with the side wall surface of the water pump, which is cooler than the coupling side. Become,
The silicone oil will be effectively cooled. As a result, since a decrease in the viscosity of the silicone oil is prevented, variations in the transmitted torque are reduced and surplus torque is no longer required, making it possible to downsize the coupling device. In addition, the durability of the heat-resistant parts will be improved.

The second circulation passage and the third circulation passage communicate with each other through a fourth circulation passage formed by exposing the flange portion on the water pump side, or through a circulation passage provided inside the water pump. It can be configured to communicate with each other.

Other features and advantages of the invention will become apparent from the following description with reference to the embodiments of the accompanying drawings.

(Embodiment) FIG. 1 is a longitudinal sectional view of a temperature-sensitive hydraulic fan coupling device according to a preferred embodiment of the present invention, in which a drive disk 2 is fixed to the tip and an engine water pump 50 is attached to the rear end. (See Figure 5)
A sealed case 6 is relatively rotatably supported via a bearing 3 on a rotary drive shaft 1 on which a flange portion 15 is formed for connection to the end face of the It is divided into a reservoir chamber 8 and a torque transmission chamber 9. The sealed case 6 is
A cooling fan (not shown) is installed and the bearing 3
It is assembled by a body 5 holding the body 5 and a cover 4 facing the body 5. A temperature sensing element 10 made of a bimetal and disposed outside the cover 4 side of the sealed case is bent and deformed in response to temperature changes, and a valve member 12 is provided on the partition plate 7 to contact the piston rod 11 in conjunction with this. opening and closing the outflow adjustment hole 13,
Torque is transmitted by oil flowing from the oil reservoir chamber 8 to the torque transmission chamber 9.

As shown in FIG. 2, a first dam member 17 made of thin plastic is attached to the side wall surface of the body of the cover 4.
is fixed with a screw 18, and when the drive disk 2 rotates in the direction of arrow R, the branch portion 19 gathers oil and sends it into the return passage 16. Therefore, as shown in FIG. 1, the oil in the working chamber 9 is returned to the oil reservoir chamber 8 via the return passage 16 by the first dam member 17.

Cooling fins 21 and 22 are integrally formed on the outer surfaces of the cover 4 and body 5 of the sealed case 6 by die-casting of aluminum material, and are arranged along the radial direction from the axis of the rotary drive shaft 1. It protrudes from the outside and works to suppress the rise in temperature of silicone oil, etc. sealed inside.

According to the present invention, a second dam member 30 is disposed on the outer circumferential end surface of the drive disk 2, and a first dam member 30 extends inside the drive disk 2 from a position adjacent to the second dam member 30 to the outer surface of the drive shaft 1. Circulation passage 3
1, a second circulation passage 32 that communicates with the first circulation passage 31 and extends inside the drive shaft 1 to its flange portion 15; and a second circulation passage 32 that extends inside the drive shaft 1 from the flange portion 15 and opens into the working chamber 9. Third circulation passage 3
3 are provided.

FIG. 3 shows a second dam member 30 made of a wear-resistant plastic material inserted into a groove in the outer peripheral end surface of the drive disk 2, and a first circulation passage formed adjacent thereto. 31, and when the drive disk 2 rotates in the direction of arrow R, oil collides with the second dam member 30 and bounces off, and is sent into the first circulation passage 31.

FIG. 4 shows a front view of the flange portion 15 of the drive shaft 1, and the second circulation passage 32 extending inside the drive shaft 1 is exposed as an opening 32A at the end face of the flange portion. 3 circulation passage 33
is exposed as an opening 33A at the end face of the flange portion. Both openings communicate with each other via a fourth circulation passage 34 that is substantially spiral and exposed at the end surface of the flange portion 15.

Thus, according to the coupling device of the present invention, the silicone oil sent into the first circulation passage 31 by the second dam member 30 passes through the second circulation passage 32 and the third circulation passage 33. and returned to the working chamber 9, and on the way, the flange part 1
Pass 5. Since the flange portion 15 is adjacent to the water pump wall surface, which is at least 10° C. lower in temperature than the sealed case side, the silicone oil is effectively cooled while passing through the circulation passage.

FIG. 5 shows a coupling device according to a second embodiment of the present invention, in which the second circulation passage 32 and the third circulation passage 33 are connected to the flange portion 15, respectively.
Circulation passages 52 (outward path) and 53 (return path) that are open at the end faces and provided inside the water pump 50
are configured to communicate via the In this embodiment, a spiral passage 54 that communicates the circulation passages 52 and 53 is formed in the impeller 55 of the water pump 50, so that the cooling effect of the silicone oil is further enhanced.

Furthermore, a heat radiation ring 60 as illustrated in FIGS. 6 and 7 is attached to the outer periphery of the drive shaft 1.
It is configured to enhance the heat dissipation cooling effect of the entire coupling.

The heat dissipation ring 60A shown in FIG. 6 includes a boss portion 61 that engages with the drive shaft 1, and a plurality of flat fins 62 extending radially outward from the boss portion.

The heat dissipation ring 60B shown in FIG.
The louver 64 is bent in a wave shape, which allows for a large heat dissipation area, and when the louver 64 rotates in the direction of the arrow R, it acts to suck in the surrounding air and forcibly stir it to cool it. There is. Various modifications of these heat dissipation rings can be considered.

It should be noted that various modifications can be made to the shape and arrangement of the circulation passages in the embodiments described above.

(Effects of the invention) As explained in detail above, according to the present invention, the above-mentioned effects can be obtained, and in particular, the temperature of silicone oil is stabilized, the transmission torque is stabilized, the coupling is made smaller, and silicone oil and Its practical value is remarkable, such as improving the durability of heat-resistant parts.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a fluid coupling device according to a first embodiment of the present invention, FIG. 2 is a partial front view showing a first dam member, and FIG. 3 is a diagram showing a second dam member and a first circulation device. A partial sectional view showing the relationship with the passage,
Fig. 4 is a front view showing the circulation passage on the end face of the flange portion, Fig. 5 is a longitudinal sectional view showing the coupling device according to the second embodiment connected to a water pump, and Fig. 6 is a front view showing the upper half of the heat dissipation ring. FIG. 7 is a half sectional view taken along the line SS in FIG. 5, and FIG. 7 is a half sectional view showing a modified example of the heat dissipation ring. 1... Drive shaft, 2... Drive disk, 3... Bearing, 4... Cover, 5... Body, 6... Sealed case, 7... Partition plate, 8... Oil sump chamber, 9... Operation Chamber, 15...flange portion, 16...return passage, 17...first dam member, 30...second dam member, 31...first circulation passage, 32...second
circulation passageway, 33... third circulation passageway, 34...
Fourth circulation passage, 50... water pump, 5
2, 53, 54... Circulation passage, 60... Heat radiation ring.

Claims (1)

[Claims for Utility Model Registration] 1. A rotary drive shaft having a drive disk fixed to its tip and a flange portion formed at its rear end for connection to the end face of a water pump of an engine, and a rotatably supported sealed case; a working chamber within the sealed case surrounding the drive disk and introducing viscous fluid; and an oil sump chamber containing the viscous fluid via a return passage from the working chamber. and a first dam member that sends viscous fluid from the working chamber toward the return passage, and between the wall surface of the drive disk and the inner wall surface of the sealed case.
In a hydraulic coupling device of the type that transmits torque by interposing a viscous fluid, a second dam member is disposed on the outer peripheral end surface of the drive disk, and further the inside of the drive disk is located at a position adjacent to the second dam member. a first circulation passage extending from the flange to the outer surface of the drive shaft; a second circulation passage communicating with the first circulation passage and extending the inside of the drive shaft to the flange portion; and a second circulation passage extending from the flange portion to the inside of the drive shaft. and a third circulation passage that opens into the working chamber or the oil reservoir chamber, and the viscous fluid sent into the first circulation passage by the second dam member flows through the second and third circulation passages. A fluid coupling device, characterized in that it is configured to pass through and return into the working chamber or into the oil sump chamber. 2. A utility model registration request in which a fourth circulation passageway is formed exposed on the water pump side end face of the flange portion, and the second circulation passageway and the third circulation passageway communicate with each other via the fourth circulation passageway. The fluid coupling device according to item 1. 3. The second circulation passage and the third circulation passage are each opened at the end face of the flange portion, and communicate with each other via a circulation passage provided inside the water pump.Claim 1 of the Utility Model Registration Claim: The fluid coupling device described.