JPH0517259U - Fluid cooling structure - Google Patents

Abstract

(57) [Summary] [Purpose] To forcibly generate an extremely high-speed air flow in the passage that penetrates the fluid in the case to improve the cooling effect of the fluid in the case. A cooling pipe 1 which is arranged so as to pass through an oil 16 in a differential carrier 12 along a front-rear direction of a traveling direction of a vehicle, and both ends 18a and 18b of which are open to a wall surface of the differential carrier 12.
8, an exhaust pipe 20 adapted to allow exhaust gas to flow from the front to the rear in the traveling direction of the vehicle, and an end portion 18b of the cooling pipe 18 that is open rearward with respect to the vehicle and the exhaust pipe 20 in order to communicate with each other. It has a connecting pipe 22 branched from the exhaust pipe 20, and a reed valve 24 arranged between the end portion 18 b and the connecting pipe 22.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid cooling structure, and more particularly to a fluid cooling structure capable of efficiently cooling lubricating oil stored inside a case.

[0002]

[Prior Art]

 As a conventional fluid cooling structure, for example, there is a fluid cooling structure for cooling lubricating oil in a vehicle differential device disclosed in Japanese Utility Model Publication No. 60-17382. This fluid cooling structure forms a passage in the oil return hole in the differential carrier, the both ends of which are opened to the outside of the differential carrier along the longitudinal direction of the vehicle. Is open to the front of the differential carrier, where air can be easily introduced when the vehicle is running, and the rear opening is open to the lower surface of the differential carrier.

Therefore, as the vehicle travels, air is sent into the passage, and an air flow of cooling air is generated in the passage from the front opening to the rear opening. At this time, the lubricating oil that flows in the oil return hole flows while touching the entire outer circumference of the passage, so heat is exchanged between the lubricating oil and the cooling air, and this lubricating oil is cooled. can do.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, since the air is sent into the passage only by the traveling of the vehicle, a high-speed air flow cannot be generated in the passage, and a sufficient cooling effect is obtained. There was a problem that I could not do it. Further, since the flow velocity of air depends on the vehicle speed, there is a problem that a sufficient cooling effect of the lubricating oil cannot be obtained especially during low speed running.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to forcibly generate an extremely high-speed air flow in a passage to cool the air passage. An object of the present invention is to provide a fluid cooling structure with improved effect.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the fluid cooling structure according to the present invention is arranged so as to penetrate the fluid in the case along the front-rear direction of the traveling direction of the vehicle, and has openings on both sides of the case wall surface. A first passage having an opening that opens, a second passage in which a high-speed airflow is made to flow in a direction that flows from the front to the rear with respect to the traveling direction of the vehicle, and the vehicle in the first passage And a connecting portion that communicates the second passage with the opening located rearward with respect to the traveling direction, and is disposed in the connecting portion, and allows the movement of the air flow from the first passage to the second passage. On the other hand, a reed valve that prohibits the high-speed airflow flowing in the second passage from entering the first passage is provided.

[0007]

[Action]

 When a high-speed air flow is generated in the second passage due to the exhaust gas of the vehicle engine, the point aspiration effect causes air to be sucked in through the opening in front of the vehicle in the first passage. As a result, a high-speed airflow is also generated in the first passage. Therefore, heat exchange between the fluid in the case and the air flow in the first passage is promoted, and the fluid in the case is efficiently cooled.

[0008]

【Example】

 Hereinafter, a fluid cooling structure according to the present invention will be described in detail with reference to the drawings.

FIG. 1 illustrates a fluid cooling structure according to the present invention mounted on a differential carrier of a differential device.

A differential mechanism 14 is arranged in the differential carrier 12 of the differential device 10. The lower part 12 a of the differential carrier 12 is soaked by dipping the lower part of the differential mechanism 14 into a lubricating oil. 16 are stored.

A cooling pipe 18, which is a first passage extending from the front surface 12b 1 to the rear surface 12c in the traveling direction of the vehicle, penetrates through the differential carrier 12. In the cooling pipe 18, an end portion 18a on the front surface 12b side is opened at the bottom portion 12a on the front side of the differential carrier 12, and an end portion 18b on the rear surface 12c side is opened so as to project outward from the differential carrier 12. ing. The end portion 18b is connected to an end portion 22a of a connecting pipe 22 that is a connecting portion branched from an engine exhaust gas exhaust pipe 20 that is a second passage. Further, a reed valve 24 is arranged between the end portion 18b and the end portion 22a. The reed valve 24 allows passage of an airflow flowing from the front end 18 a of the cooling pipe 18 to the connecting pipe 22 through the end 18 b, but on the other hand, from the connecting pipe 22 side. It prohibits the passage of airflow into the interior.

As shown in FIGS. 1 and 2, cooling fins 18 c are formed on the cooling pipe 18 so as to protrude toward the inner and outer peripheral sides of the cooling pipe 18 in order to increase the surface area of the cooling pipe 18. Has been done. In this embodiment, the cooling fins 18c projectingly formed on the inner peripheral side and the outer peripheral side of the cooling pipe 18 so as to face each other and the cooling fins 18c projecting only on the inner peripheral side are arranged in combination. However, the present invention is not limited to this combination, and it goes without saying that the cooling fins 18c protrudingly formed on the inner peripheral side and the cooling fins 18c protrudingly formed on the outer peripheral side may be appropriately combined and configured. ..

In the above configuration, when the engine is driven to drive the vehicle, air is introduced from the end 18a of the cooling pipe 18 in the direction indicated by the arrow A in FIG. To 18b, the air flows in the cooling pipe 18, passes through the reed valve 24, and then flows out from the connecting pipe 22 to the exhaust pipe 20. At this time, in the exhaust pipe 20, as shown by the arrow B, the high-temperature exhaust gas of the engine flows at high speed from the front to the rear with respect to the traveling direction of the vehicle. Since the cooling pipe 18 and the exhaust pipe 20 are in communication with each other by the connecting pipe 22 via the reed valve 24, the inside of the cooling pipe 18 is caused by the point aspiration effect due to the negative pressure of the exhaust gas flowing at high speed. Is sucked out to the exhaust pipe 20 side through the connecting pipe 22. Therefore, the flow velocity of the air in the cooling pipe 18 increases, and a high-speed air flow is generated. Therefore, heat exchange is promoted between the oil 16 and the air flow in the cooling pipe 18, and the oil can be cooled very efficiently.

Further, since the high temperature exhaust gas flowing through the exhaust pipe 20 is prohibited from entering the cooling pipe 18 by the reed valve 24, the exhaust gas flows into the cooling pipe 18 under any running condition. There is no such thing.

Further, since the cooling fins 18c are formed in the cooling pipe 18, the contact area with the oil 16 is increased, so that the heat exchange between the oil and the cooling air is achieved more effectively, Cooling capacity is improved.

[0016]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

Since the first passage for introducing the cooling air penetrating the inside of the case and the second passage through which the high-speed fluid flows are connected through the reed valve, the first aspiration effect is achieved by the point aspiration effect. Since the flow velocity of the air flowing through the passage can be increased, the fluid in the case can be efficiently cooled.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a fluid cooling structure according to the present invention.

2 is a sectional view of the cooling pipe taken along line II-II in FIG. 1. FIG.

[Explanation of symbols]

 10 Differential Device 12 Differential Carrier Mechanism 12a Bottom 12b Front 12c Rear 14 Differential 16 Oil 18 Cooling Pipe (First Passage) 18a End 18b End 20 Exhaust Pipe 22 Connection Pipe (Connection) 22a End 24 Reed Valve

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[Procedure amendment]

[Submission date] August 28, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Scope of utility model registration request] 1. A fluid cooling structure for cooling a fluid stored in a case mounted on a vehicle, wherein the fluid in the case penetrates along a front-back direction of a traveling direction of the vehicle. A high-speed airflow is arranged to be provided and to have a first passage having openings at both ends which open to the wall surface of the case, and a direction in which the high-speed airflow flows from the front to the rear in the traveling direction of the vehicle. A second passage, a connecting portion that communicates the first passage with the one opening located rearward of the first passage in the traveling direction of the vehicle, and a connecting portion that is arranged in the connecting portion. While allowing the movement of the air flow from the first passage to the second passage,
A fluid cooling structure comprising: a reed valve for prohibiting a high-speed airflow flowing in the second passage from entering the first passage.