JP2011158126A - Completely-sealed cooling device in internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a size and a weight, to lower a price, and to scale down a space in a completely-sealed cooling device for an internal combustion engine. <P>SOLUTION: A partitioning plate 10 is disposed in an upper tank 4 of a radiator 2 to the internal combustion engine to divide the inside into an upper chamber 11 and a lower chamber 12, a radiator cap 13 including a pressure control valve 15 is disposed in the upper chamber 11, a core 3 for cooling of the radiator is communicated with the lower chamber 12, further the partitioning plate 10 has a through hole 16 for communicating the upper chamber and the lower chamber with each other, and a cooling liquid inflow port 14 from the internal combustion engine, is formed on the upper chamber. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooling device in which a coolant circulation path in an internal combustion engine and a radiator is completely sealed by connecting a reserve tank thereto.

  2. Description of the Related Art Conventionally, in a cooling device in which a coolant circulation path in an internal combustion engine and a radiator is completely sealed, for example, as described in Patent Documents 1 and 2, a radiator cap is provided in the upper tank of the radiator. And a part of the coolant in the upper tank of the radiator is circulated between the reserve tank and the internal combustion engine through the reserve tank, while a pressure regulating valve is provided in the radiator cap of the reserve tank. By doing so, the air is removed from the coolant, the expansion / contraction of the coolant is absorbed, and the coolant is replenished.

Japanese Patent Laid-Open No. 11-093668 JP 2004-257717 A

  According to this conventional configuration, in addition to requiring a reserve tank having pressure resistance, a pipe or a hose connecting the reserve tank, the radiator, and the circulation path is required. Furthermore, the reserve tank As a result, a large number of parts, a large space increase, and a significant increase in weight and price are required.

  Moreover, conventionally, the cooling liquid that has returned from the internal combustion engine to the radiator upper tank flows into the cooling core in the radiator without being separated into gas and liquid in the upper tank, thereby cooling into the cooling core. There is also a problem that air bubbles are embraced in the liquid and the cooling performance of the radiator is lowered.

  The present invention has a technical problem to solve these problems.

In order to achieve this technical problem, claim 1
“In the upper tank of the radiator for the internal combustion engine, a partition plate is provided, which is divided into an upper chamber and a lower chamber, a radiator cap having a pressure regulating valve is provided in the upper chamber, and a cooling core in the radiator is provided in the lower chamber. , While the partition plate is provided with a through-hole communicating between the upper chamber and the lower chamber, and further provided with a coolant inlet from the internal combustion engine in the upper chamber.
It is characterized by that.

Claim 2
“In the first aspect of the present invention, the coolant inlet to the upper chamber is located at a portion immediately above or near the through hole in the partition plate.”
It is characterized by that.

Furthermore, claim 3
“In Claim 1 or 2, the through hole in the partition plate is located at a central portion or a portion close thereto in the width direction of the radiator.”
It is characterized by that.

  According to claim 1, the coolant discharged from the internal combustion engine to the radiator enters the upper chamber in the upper tank of the radiator from the coolant inlet, enters the lower chamber from the upper chamber through the through hole in the partition plate, and , Enters the cooling core of the radiator from this lower chamber.

  When the coolant enters the upper chamber of the upper tank, the coolant is separated into gas and liquid so that air bubbles in the coolant rise and separate, and flow into the lower chamber from the through hole in the partition plate. Thus, the partition plate can reduce the air in the upper chamber from being mixed into the lower chamber due to the inclination of the radiator, etc., thereby holding air bubbles in the coolant flowing into the cooling core. Therefore, it is possible to reliably prevent the cooling performance of the radiator from being reduced by air bubbles.

  On the other hand, the upper chamber of the upper tank of the radiator is provided with a radiator cap having a pressure regulating valve. This upper chamber has the same function as the conventional reserve tank, that is, the air is removed from the coolant and the coolant is discharged. Absorbing expansion and contraction and replenishing coolant, the conventional reserve tank can be omitted, the number of parts can be reduced, the space can be greatly reduced, and the weight and price can be greatly reduced. it can.

  Further, according to claim 2, the coolant entering the upper chamber from the coolant inlet port immediately flows into the lower chamber from the through hole in the partition plate, thereby allowing the coolant to flow into the lower chamber. Even when the radiator is tilted due to the inclination of the vehicle or the like, it can be ensured reliably, so that it is possible to reliably prevent the cooling performance of the radiator from decreasing due to the inclination of the radiator or the like.

  According to a third aspect of the present invention, when the liquid level in the upper chamber of the upper tank is inclined due to turning of the vehicle or inclination of the vehicle, the through hole in the partition plate is exposed to the inclined liquid level. Since this can be avoided, it is possible to reliably prevent air from entering the lower chamber through the through hole, and the effect can be promoted.

It is a figure which shows the state which connected the radiator to the internal combustion engine. FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 2.

  Embodiments of the present invention will be described below with reference to FIGS.

  In these drawings, reference numeral 1 denotes an internal combustion engine mounted on a vehicle, and reference numeral 2 denotes an air-cooled radiator 2 for the internal combustion engine 1.

  As is well known in the art, the radiator 2 includes a cooling core 3, an upper tank 4 provided on the upper surface of the core 3, and a lower tank 5 provided on the lower portion of the core 3.

  A coolant return pipe 6 from the internal combustion engine 1 is connected to the upper tank 4, while a coolant supply pipe 8 to the coolant pump 7 in the internal combustion engine 1 is connected to the lower tank 5. Thus, the coolant is configured to circulate between the internal combustion engine 1 and the radiator 2.

  A cup body 9 is inserted into the upper tank 4 of the radiator 2 from the lower surface thereof in the reverse direction, so that the interior of the upper tank 4 is separated by the partition plate 10 constituting the ceiling of the cup body 9. The upper chamber 11 above the partition 10 and the lower chamber 12 below the partition plate 10 are divided into a radiator cap 13 in the upper chamber 11 and a coolant return pipe from the internal combustion engine 1. 6 is provided, and the lower chamber 12 is configured to communicate with the cooling core 3.

  The radiator cap 13 incorporates a pressure regulating valve 15 as described in, for example, Patent Documents 1 and 2 and the like.

  As is well known in the art, the pressure regulating valve 15 is composed of a pressurizing valve and a negative pressure valve. When the internal pressure increases, the internal air or coolant is released into the atmosphere from the opening 15a. When the internal pressure becomes low, atmospheric air is sucked from the opening 15a to maintain the inside at a predetermined pressure.

  A hose 15b for opening to the atmosphere is connected to the opening 15a in the pressure regulating valve 15.

  The partition cup body 9 is caulked around the support plate 3a in a state where the lower end periphery is sandwiched between the support plate 3a of the cooling core 3 and the lower end periphery of the upper tank 4. In contrast, it is fixed so as to seal the inside.

  The partition plate 10 that divides the upper tank 3 into upper and lower chambers 11 and 12 includes the upper chamber 11 and the lower chamber 12 in the central portion in the width direction of the radiator 2 or a portion close thereto. A through hole 16 communicating with each other is formed, and the coolant inlet 14 to the upper chamber 11 is located at a portion immediately above the through hole 16 and a portion close thereto. .

  In addition, the partition plate 10 is formed by inclining the portions on both sides of the through hole 16 of the partition plate 10 in a straight line obliquely upward toward the through hole 16 or in a stepped manner. The portion of the through hole 16 is configured to be the highest.

  In this configuration, the coolant discharged from the internal combustion engine 1 to the radiator 2 enters the upper chamber 11 in the upper tank 4 of the radiator 2 through the coolant inlet 14, and from the inside of the upper chamber 11, the through hole 16 in the partition plate 10. It passes through the lower chamber 12 through the lower chamber 12 and enters the cooling core 3 in the radiator 2 from the lower chamber 12.

  As a result, when the coolant enters the upper chamber 11 in the upper tank 4, air-liquid separation is performed such that air bubbles in the coolant rise and separate, and the coolant in the partition plate 10 passes through. By flowing into the lower chamber 12 from the hole 16, the partition plate 10 can reliably reduce the air in the upper chamber 11 from being mixed into the lower chamber 12 due to the inclination of the radiator 2 or the like. .

  The upper chamber 11 in the upper tank 4 is provided with a radiator cap 13 provided with a pressure regulating valve 15, so that the same operation as the conventional reserve tank is performed, that is, the air is extracted from the cooling liquid, the expansion / contraction of the cooling liquid is performed. Absorbs shrinkage and replenishes coolant.

  The coolant inlet 14 to the upper chamber 11 in the upper tank 4 is located at or near the through hole 16 so that the coolant enters the upper chamber 11 from the coolant inlet 14. The coolant immediately flows into the lower chamber 12 from the through hole 16 in the partition plate 10, and therefore the radiator 2 is inclined by the inclination of the vehicle or the like due to the coolant flowing into the lower chamber 12. Even in cases, it can be surely secured.

  Further, since the through hole 16 in the partition plate 10 is located at a central portion in the width direction of the radiator 2 or a portion close thereto, the liquid level A in the upper chamber 11 is used for turning the vehicle. When the vehicle is tilted as indicated by a one-dot chain line A ′ or tilted as indicated by a two-dot chain line A ″ due to the inclination of the vehicle or the like, the through hole 16 in the partition plate 10 has the inclined liquid surface A ′. , A ″ can be avoided, so that air can be reliably prevented from entering the lower chamber 12 through the through hole 16.

  Furthermore, since the partition plate 10 is configured such that the portion of the through hole 16 in the partition plate 10 is the highest, air bubbles that have entered the lower chamber 12 are collected in the through hole 16 so that the It can be discharged from the lower chamber 12 to the upper chamber 11. That is, the partition plate 10 only needs to have a shape that does not hinder the movement of bubbles moving from the lower chamber 12 to the upper chamber 11, and instead of being inclined obliquely upward toward the through hole 16 as shown in the drawing. The upper tank 4 may be provided so as to be parallel to the longitudinal direction.

  On the other hand, the support structure of the partition cup body 9 is provided with a protrusion on the inner surface of the upper tank 4 in the upper chamber 11 instead of the method of caulking the support plate 3a as described above. A supporting structure in which the cup body 9 is sandwiched between the supporting plate 3a and the supporting plate 3a can be obtained.

  In another embodiment of the present invention, the entire upper tank 4 is configured as a transparent body or a semi-transparent body, or a part of the upper tank 4 is formed as a transparent body or a semi-transparent body, so The liquid level A can be seen, or a mark indicating a normal liquid level can be provided in a portion where the liquid level can be seen.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Radiator 3 Radiator cooling core 4 Radiator upper tank 5 Radiator lower tank 6 Coolant return piping 9 Partition cup body 10 Partition plate 11 Upper chamber 12 Lower chamber 13 Radiator cap 14 Coolant inlet 15 Pressure regulating valve 16 Through hole

Claims (3)

  In the upper tank of the radiator for the internal combustion engine, a partition plate is provided that divides the inside into an upper chamber and a lower chamber, a radiator cap having a pressure regulating valve is provided in the upper chamber, and a cooling core in the radiator is provided in the lower chamber. The partition plate is provided with a through-hole communicating with the upper chamber and the lower chamber, and further provided with a coolant inlet from the internal combustion engine in the upper chamber. A completely enclosed cooling device for an internal combustion engine.   2. The fully-enclosed cooling in an internal combustion engine according to claim 1, wherein the coolant inlet to the upper chamber is located at a portion immediately above or near a through hole in the partition plate. apparatus.   3. The completely hermetic cooling device for an internal combustion engine according to claim 1, wherein the through hole in the partition plate is located at a central portion or a portion close to the central portion in the width direction of the radiator.

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