JP2011247200A - Structure of cooling radiator in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a radiator for air-cooling cooling liquid in an internal combustion engine, for solving problems of a conventional radiator.SOLUTION: In the structure of the cooling radiator in the internal combustion engine, the radiator is formed by providing, on an upper tank attached to the upper face of a cooling core, an inflow pipe of the cooling liquid from the internal combustion engine to the upper tank and a filling pipe of the cooling liquid to the upper tank, by providing a radiator cap having a built-in pressure regulation valve on the filling pipe and by further providing a regular liquid level indicator indicating a regular cooling liquid amount on the upper tank. In the radiator, a second liquid level indicator is provided on a part higher than the regular liquid level indicator in the upper tank.

Description

  The present invention relates to a radiator structure for air-cooling a coolant in an internal combustion engine used in a vehicle or the like.

  Conventionally, a radiator used in an internal combustion engine with a completely hermetic cooling system has a reserve tank connected to the upper tank, and a radiator cap with a built-in pressure regulating valve is provided in the coolant injection pipe to the reserve tank. The configuration was such that the pressure in the circulation path was adjusted, the air was removed from the coolant, and the coolant was injected and replenished (see Patent Documents 1 and 2).

  However, in this configuration, since a reserve tank is required, there are problems such as a complicated structure and a large installation space.

  Therefore, Patent Document 3 as prior art discloses that in the radiator, an upper tank attached to the upper surface of the cooling core is provided with an inflow pipe for cooling liquid from the internal combustion engine to the upper tank and an injection pipe for cooling liquid to the upper tank. And a radiator cap with a built-in pressure regulating valve in the injection pipe. Further, a liquid level gauge (hereinafter referred to as “level gauge”) for confirming whether or not a steady cooling liquid amount necessary for normal circulation is secured in the upper tank. , Referred to as a steady level gauge).

Japanese Patent Laid-Open No. 11-093668 JP 2004-257717 A JP 2002-038945 A

  In this prior art radiator, the reserve tank can be omitted, but there are problems as described below.

  That is, when injecting a predetermined amount of coolant necessary for circulation into an internal combustion engine and a radiator in a vehicle production line, a maintenance factory, etc., firstly, the coolant is injected to the level of the steady level gauge. Next, in consideration of the fact that a portion where the cooling liquid is not filled due to the remaining air is inevitably formed as it is, the cooling liquid is added in excess of the remaining air and injected.

  However, since the amount of additional coolant to be injected is left to the operator's target amount, there is a high possibility that the amount of coolant injected will be excessive or insufficient. As a result, the coolant was blown out, or the coolant was not circulated due to insufficient injection amount.

  It is a technical object of the present invention to provide a radiator structure that solves this problem.

In order to achieve this technical problem, claim 1
“An upper tank attached to the upper surface of the cooling core is provided with an inflow pipe for cooling liquid from the internal combustion engine to the upper tank and an injection pipe for cooling liquid into the upper tank. A radiator cap with a built-in pressure regulating valve is installed in the injection pipe. In addition, in the radiator, wherein the upper tank is provided with a steady level gauge indicating a steady amount of coolant,
A second liquid level gauge is provided in a portion of the upper tank that is appropriately higher than the steady liquid level gauge. "
It is characterized by that.

Claim 2
“In the first aspect of the present invention, the steady liquid level gauge is configured by making the inflow pipe a transparent body or a semi-transparent body, and the second liquid level gauge includes the transparent pipe or the semi-transparent body. It is composed by making it transparent. "
It is characterized by that.

  According to claim 1, when injecting the coolant into the internal combustion engine and the radiator, after injecting to the level of the steady level gauge, further injecting to the height of the second level gauge beyond the steady level gauge. Thus, the cooling liquid can be added and injected in an extra amount corresponding to the height from the steady liquid level gauge to the second liquid level gauge. It is possible to arrange them in almost the same amount.

  Accordingly, when the coolant is injected in the vehicle production line, the maintenance shop, etc., it is possible to surely reduce the possibility of excess or deficiency in the coolant injection amount and improve workability.

  According to claim 2, since two liquid level gauges are provided in one upper tank using the inflow pipe and the injection pipe in the upper tank, the number of parts can be reduced and the price can be reduced. Weight can be reduced.

It is a front view which shows the upper part of a radiator. FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. It is a figure which shows another embodiment in the inflow pipe of a cooling fluid. It is sectional drawing which shows the state which the upper tank decomposed | disassembled. It is a figure which shows attachment of the inflow pipe | tube and injection pipe | tube of a cooling fluid. It is IX-IX sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes a cooling radiator for an internal combustion engine (not shown), and this radiator 1 is air-cooled as well known in the art, and includes a cooling core 2, An upper tank 3 at the upper part of the cooling core 2 and a lower tank (not shown) at the lower part of the cooling core 2 are constituted.

  The upper tank 3 is configured in a downward box shape with a light alloy such as aluminum opened only at the lower surface, and is placed on the upper surface of an upper plate 4 made of a metal plate fixed to the upper end of the cooling core 2. ing.

  Further, the upper tank 3 is attached to the upper plate 4 by being fitted to the peripheral piece 4a of the upper plate 4 and then brazed to the peripheral piece 4a. Reference numeral 5 denotes a build-up at the time of brazing.

  A partition plate 6 having a downward U-shaped cross section is inserted into the upper tank 3 at an appropriate height from its lower surface, so that the interior of the upper tank 3 is separated by the partition plate 6. An upper chamber 7 above the plate 6 and a lower chamber 8 below the partition plate 6 are defined.

  In the upper chamber 7, a coolant inflow pipe 9 and a liquid level gauge pipe 10 from the internal combustion engine to the upper chamber 7 are mounted side by side at substantially the same height. A cooling liquid injection pipe 11 is attached to a portion that is appropriately higher than the inflow pipe 9 and the liquid level gauge pipe 10 by a dimension H.

  On the other hand, the lower chamber 8 is configured to communicate with the cooling core 2.

  The inflow pipe 9, the liquid level gauge pipe 10, and the injection pipe 11 are configured to protrude from one side surface of the upper tank 3 toward the internal combustion engine.

  When the upper tank 3 is attached to the upper plate 4 by brazing, the partition plate 6 is fixed by being sandwiched between the recessed portions 12 provided on the left and right side surfaces of the upper tank 3 and the upper plate 4. As shown in FIGS. 1 and 5, the partition plate 6 has the upper chamber 7 and the lower chamber 8 in the middle portion in the wide width direction of the radiator 1 or a portion close thereto. A through hole 13 is formed to communicate with each other.

  The coolant inflow pipe 9 into the upper chamber 7 is made of synthetic resin and is located directly above the through hole 13 or at a position close to this. That is, as shown in FIGS. 1 and 5, the cooling liquid inflow pipe 9 is also located at the central portion in the wide lateral direction of the radiator 1 or a portion close thereto.

  As shown in FIGS. 3 and 4, the liquid level gauge tube 10 in the upper chamber 7 is made of a transparent or translucent synthetic resin, and has an inclined surface 14a, a high scale 14b, and a low scale 14c at its tip. A steady level gauge 14 is provided.

  On the other hand, the coolant injection pipe 11 to the upper chamber 7 is also made of synthetic resin and has a shape that bends upward from the side as shown in FIG. 2, and a radiator cap 15 is detachable at the upper end. The radiator cap 15 has a built-in pressure regulating valve 16 as described in Patent Documents 1 and 2, for example.

  As is well known, the pressure regulating valve 16 is composed of a pressurizing valve and a negative pressure valve. When the internal pressure increases, the internal air is released from the opening 17 into the atmosphere, while the internal pressure is increased. Is reduced, the atmospheric air is sucked from the opening 17 to maintain the inside at a predetermined pressure. The opening 17 is connected to a hose 18 for opening to the atmosphere.

  A second liquid level gauge 19 is provided in the injection pipe 11 positioned at a position appropriately higher than the steady liquid level gauge 14 by a dimension H.

  The second liquid level gauge 19 includes a window portion 19a made of a transparent or translucent synthetic resin attached to a part of the injection tube 11, and a scale 19b provided on the window portion 19a. In this embodiment, the entire injection tube 11 is made of a transparent or translucent synthetic resin, and the entire injection tube 11 is configured as a second liquid level gauge by providing a scale thereon. Can do. As a result, the injection tube 11 can also be used as the second liquid level gauge 14 ', so that the number of parts can be reduced.

  The attachment portions of the inflow pipe 9, the liquid level gauge pipe 10, and the injection pipe 11 to the upper tank 3 are configured as shown in FIGS.

  That is, the base ends of these tubes 9, 10, 11 are inserted into the socket tube 21 fixed to the side surface of the upper tank 3 by brazing or the like with the sealing O-ring 20 fitted thereto. Next, a part of the tip of the socket tube 21 is caulked at a plurality of locations around the circumference into an annular groove 22 provided on the outer peripheral surface of each tube 9, 10, 11. This caulking portion is denoted by reference numeral 21a.

  In this configuration, the coolant discharged from the internal combustion engine to the radiator 1 enters the upper chamber 7 in the upper tank 3 of the radiator 1 through the inflow pipe 9 and passes through the through hole 13 in the partition plate 6 from within the upper chamber 7. A path is entered into the lower chamber 8 and enters the cooling core 2 in the radiator 1 from the lower chamber 8.

  As a result, when the coolant enters the upper chamber 7 in the upper tank 3, air-liquid separation is performed such that air bubbles in the coolant rise and separate, and the coolant in the partition plate 6 passes through. By flowing into the lower chamber 8 from the hole 13, the partition plate 6 can reliably reduce the air in the upper chamber 7 from being mixed into the lower chamber 8 due to the inclination of the radiator 1 or the like. .

  The upper chamber 7 in the upper tank 3 is provided with a radiator cap 15 having a pressure regulating valve 15 in the coolant injection pipe 11 to the upper chamber 7, so that the same operation as the conventional reserve tank, that is, Adjust the pressure, such as removing air from the coolant and absorbing expansion and contraction of the coolant, and replenish the coolant.

  The coolant inflow pipe 9 to the upper chamber 7 in the upper tank 3 is located in a portion directly above or close to the through hole 13 so that it enters the upper chamber 7 from the inflow tube 9. Since the coolant immediately flows into the lower chamber 8 from the through hole 13 in the partition plate 6, the radiator 1 is inclined by the inclination of the vehicle or the like due to the coolant flowing into the lower chamber 8. Even in cases, it can be surely secured.

  Further, the through hole 13 in the partition plate 6 is located at a central portion in the wide lateral direction of the radiator 1 or a portion close thereto, so that the liquid level in the upper chamber 7 is a vehicle turning or the like. 1 and 5, the through hole 13 in the partition plate 6 can be prevented from being exposed to the inclined liquid surface due to the inclination of the vehicle. Air can be reliably prevented from entering the lower chamber 8.

  Then, the coolant is injected into the radiator 1 through the injection pipe 11. When injecting the coolant, the coolant is first injected up to the level of the steady liquid level gauge 14, and then the steady liquid level. By injecting over the total 14 to the height of the second liquid level gauge 19, the cooling liquid is injected in excess by the height dimension H from the steady liquid level gauge 14 to the second liquid level gauge 19. In addition, the amount of extra injection can be adjusted to substantially the same amount.

  Next, FIG. 6 shows another embodiment.

  In this other embodiment, the entire inflow pipe 9 'attached to the upper tank 3 is made of a transparent or translucent synthetic resin, and a steady liquid level comprising a high scale 14b' and a low scale 14c '. In this configuration, the inflow pipe 9 'can be used also as the steady liquid level gauge 14', so that the number of parts can be reduced.

DESCRIPTION OF SYMBOLS 1 Radiator 2 Cooling core 3 Upper tank 4 Upper plate 6 Partition plate 7 Upper chamber of upper tank 8 Lower chamber of upper tank 9, 9 'Cooling liquid inflow pipe 11 Cooling liquid injection pipe 13 Through hole 14, 14' Steady liquid level gauge 15 Radiator cap 16 Pressure regulating valve 19 Second liquid level gauge

Claims (2)

An upper tank attached to the upper surface of the cooling core is provided with a coolant inflow pipe from the internal combustion engine to the upper tank and a coolant injection pipe into the upper tank, and a radiator cap with a built-in pressure regulating valve is provided in the injection pipe. Furthermore, in the radiator in which the upper tank is provided with a steady level gauge indicating a steady amount of coolant,
A structure of a cooling radiator in an internal combustion engine, wherein a second liquid level gauge is provided in a portion of the upper tank higher than the steady liquid level gauge.   2. The liquid level gauge according to claim 1, wherein the steady-state liquid level gauge is formed by making the inflow pipe a transparent body or a translucent body, and the second liquid level gauge includes the transparent pipe or the translucent body. A structure of a radiator for cooling in an internal combustion engine, characterized in that the structure is made of a body.

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