JP2007198148A - Heat exchanger arrangement structure of v-type internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger arrangement structure of a V-type internal combustion engine excellent in general versatility, in which heat exchange is efficiently performed when a lubricating oil is cooled and heated. <P>SOLUTION: In the V-type internal combustion engine, cylinders 2F, 2R are disposed in a mutually tilted state in V-shape. A connecting pipe 20 allowing a water pump 10 in a cooling water passage to communicate with a thermostat 12 is disposed in the space inside the V-bank of the V-type internal combustion engine. A water-cooled heat exchanger 30 exchanging heat between itself and the lubricating oil is installed in the connecting pipe 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an arrangement structure of a heat exchanger in a V-type internal combustion engine in which a plurality of cylinders are arranged to be inclined in a V shape.

  In the V-type internal combustion engine, the V-bank internal space (valley space between cylinders inclined in a V shape) is a dead space and is long in the longitudinal direction. Therefore, an oil cooler is disposed in the V-bank internal space. It has been conventionally proposed to reduce the size of an internal combustion engine (see Patent Document 1).

JP 11-270338 A

The conceptual diagram seen from the front of the V-type internal combustion engine of embodiment disclosed by the patent document 1 is illustrated in FIG.
"... A horizontal partition plate 6 is provided in a space that forms a V-shaped valley at the top of the V-shaped engine, and an upper water channel 7 and a lower water channel 8 having an upper and lower two-layer structure extending in the longitudinal direction of the cylinder block 2 are formed. A cooling water supply port 7a is provided at one end of the upper water passage 7, and the other end communicates with the lower water passage 8. "(paragraph [0012])," in the cylinder block 2 The cylinder 1 and the water chamber 3 are formed, and each water chamber communicates with the lower water channel 8 through the supply port 3a, so that the cooling water from the upper water channel 7 to the lower water channel 8 is While flowing into the water chambers 3 of the cylinder liners through the supply ports 3a, ... (paragraph [0013]), "the oil coolers 5a and 5b are divided into two parts, and the longitudinal direction of each of the cooling waters is the cooling water. Arranged in the upper channel 7 so as to be parallel to the flow direction And are. There is described as ... (paragraph [0014]) ".

Thus, the oil coolers 5a and 5b are disposed in the upper water channel 7 in the flow of the cooling water from the upper water channel 7 formed between the V banks to the water chamber 3 through the lower water channel 8.
The location of the water pump is not described in the publication of Patent Document 1, and is unknown, and there is no water pump at least from the upper water channel 7 to the water chamber 3.

  Therefore, since the cooling water in the upper water channel 7 is not sucked into the water pump and flows, the flow rate is slow and unstable, so that the oil flowing through the oil coolers 5a and 5b disposed in the upper water channel 7 Efficient heat exchange cannot be expected.

Further, since the upper water channel 7 and the lower water channel 8 are formed integrally with the upper and lower two-layer structure by providing the partition plate 6 in the space that becomes the V-shaped valley at the top of the V-shaped engine, the heat of the cylinder is directly applied. The cooling of the oil coolers 5a and 5b in the upper water channel 7 is not always easy.
Further, the engine itself is of a special specification, and the cooling structure of the oil cooler cannot be applied to a general V-type engine, and is not versatile.

  The present invention has been made in view of the above points, and the object of the present invention is a V-type internal combustion engine that is capable of efficiently exchanging heat even when the lubricating oil is cooled or raised in temperature, and has excellent versatility. It is in the point which provides the heat exchanger arrangement structure of an engine.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a V-type internal combustion engine in which a plurality of cylinders are inclined with respect to each other in a V shape, and a connecting pipe that communicates a water pump and a thermostat in a cooling water passage is The heat exchanger arrangement structure of the V-type internal combustion engine is provided in the V-bank internal space of the V-type internal combustion engine, and a water-cooled heat exchanger that exchanges heat with the lubricating oil is installed in the connecting pipe.

  According to a second aspect of the present invention, there is provided a heat exchanger arrangement structure for a V-type internal combustion engine according to the first aspect, wherein the water-cooled heat exchanger comprises a triple that includes an inner pipe, an outer middle pipe and an outer outer pipe. It has a pipe structure. Cooling water passes through the inner pipe line inside the inner pipe and the outer pipe line between the middle pipe and the outer pipe, and oil passes through the middle pipe line between the inner pipe and the middle pipe. It is characterized in that it is installed in the connecting pipe according to the configuration.

  According to a third aspect of the present invention, in the heat exchanger arrangement structure of the V-type internal combustion engine according to the first or second aspect, the V-type internal combustion engine is placed horizontally with the crankshaft directed in the left-right direction of the vehicle body. It is mounted on a vehicle.

  According to the heat exchanger arrangement structure of the V-type internal combustion engine according to the first aspect, the water-cooled heat exchanger is installed in the connecting pipe disposed in the V bank inner space of the V-type internal combustion engine.

  Therefore, the water-cooled heat exchanger is located in the V bank space and is not easily affected by the outside air, so that the required heat exchange can be expected, and the connecting pipe that connects the water pump and the thermostat is always a pipe through which the entire amount of cooling water flows. Since the flow of cooling water sucked into the water pump is fast and stable, the water-cooled heat exchanger installed in such a connecting pipe is efficient both when cooling and heating the lubricating oil. Heat exchange can be performed, and the oil temperature can be optimized to improve fuel consumption and emission performance.

Since the water-cooled heat exchanger is built in the connecting pipe disposed in the V-bank space, it can be easily applied to a general V-type internal combustion engine and has excellent versatility.
In addition, a water-cooled heat exchanger is provided by effectively using the dead space, which contributes to downsizing of the internal combustion engine.

  According to the heat exchanger arrangement structure of the V-type internal combustion engine according to claim 2, the water-cooled heat exchanger has a triple tube structure including an inner tube, an intermediate tube, and an outer tube, Since the cooling water passes through the pipe and the outer pipe between the middle pipe and the outer pipe, and the oil passes through the middle pipe between the inner pipe and the middle pipe, the oil flow is the flow of the cooling water. The heat exchange efficiency is extremely high.

  According to the heat exchanger arrangement structure for the V-type internal combustion engine according to the third aspect, the V-type internal combustion engine is mounted horizontally on the vehicle with the crankshaft directed in the left-right direction of the vehicle body. The water-cooled heat exchanger installed in the connecting pipe installed is not affected by the traveling wind, and the required heat exchange can be expected.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
The V-type internal combustion engine 1 according to the present embodiment is mounted horizontally on a vehicle with a crankshaft directed in the left-right direction of the vehicle body, and a front cylinder row 2F and a rear cylinder row each having six cylinders. This is a 6-cylinder V-type internal combustion engine in which the cylinder row 2R is tilted forward and backward to form a V shape.

  The front cylinder row 2F and the rear cylinder row 2R are provided on the crankcase while being inclined so as to form a V shape, and the front cylinder head 3F and the rear cylinder are respectively disposed on the front cylinder row 2F and the rear cylinder row 2R. The head 3R is overlaid, and the cylinder head cover is overlaid on the front cylinder head 3F and the rear cylinder head 3R, and fastened together.

  1 and 2 show a state in which the front cylinder head 3F and the rear cylinder head 3R are superimposed on the front cylinder row 2F and the rear cylinder row 2R.

  At the right and left ends of the V bank inner space S between the front cylinder row 2F and the rear cylinder row 2R (left side is left and right side is right in the vehicle forward direction), A water pump 10 is disposed along the left side surface, and a thermostat 12 is disposed along with the water passage 11 along the left side surface.

The water pump 10 and the thermostat 12 via the water passage 11 are connected to a connecting pipe 20 that passes through the V bank inner space S to the left and right.
Cooling water is sucked by driving the water pump 10, and the cooling water flows through the connecting pipe 20 from the thermostat 12 side to the water pump 10 side, that is, to the right.

The connecting pipe 20 includes a water-cooled heat exchanger 30 that is an oil cooler and an oil warmer that exchanges heat with the lubricating oil of the automatic transmission.
Therefore, the water-cooled heat exchanger 30 is in the V bank inner space S together with the connecting pipe 20.

The structure of the water-cooled heat exchanger 30 will be described with reference to FIGS.
The water-cooled heat exchanger 30 is formed in a straight portion with a slightly enlarged diameter of the connecting pipe 20, and is a triple linearly extending coaxially consisting of an inner pipe 31, an outer middle pipe 32 and an outer outer pipe 33. It has a tube structure.
The outer pipe 33 is obtained by expanding the diameter of the connecting pipe 20.

  Therefore, the water-cooled heat exchanger 30 includes an inner pipe Pi inside the inner pipe 31, an intermediate pipe Pm between the inner pipe 31 and the inner pipe 32, and an outer pipe between the inner pipe 32 and the outer pipe 33. The three pipes Pi, Pm, Po of the pipe Po are formed coaxially.

The annular openings at both ends of the middle pipe Pm between the inner pipe 31 and the middle pipe 32 are watertightly closed by the annular closing members 35 and 36.
In addition, metal fins 37 having excellent thermal conductivity are loaded in the middle pipe line Pm.

Oil connection pipes 38 and 39 protrude from the vicinity of both ends of the water-cooled heat exchanger 30.
The oil connection pipes 38 and 39 are connected to both ends of the middle pipe line Pm through the outer pipe Po from the outside.

  That is, as shown in FIGS. 4 and 5, the side wall portion of the outer tube 33 to which the oil connection tube 38 is attached is formed with an annular flat portion 33a in which a circular hole is formed by being deformed flat. The flange 38a at the end of the oil connection pipe 38 fitted in the circular hole of the flat portion 33a is in contact with the inner surface of the annular flat portion 33a, and the annular seal member 40 is applied to the outer surface of the annular flat portion 33a with a fastener 41. Thus, the end of the oil connection pipe 38 is attached to the outer pipe 33 so that the flange 38a and the annular seal member 40 sandwich the annular flat part 33a of the outer pipe 33.

The side wall portion of the middle tube 32 facing the end of the oil connection pipe 38 bulges and the tip forms a cylindrical portion 32a to open, and the cylindrical portion 32a is fitted into the end opening of the oil connection tube 38. Then, the periphery is liquid-tightly bonded and partitioned from the outer pipe Po to communicate the inside of the oil connection pipe 38 with the middle pipe Pm.
The other oil connecting pipe 39 has the same structure and penetrates the outer pipe Po and is connected to the middle pipe Pm.

  Accordingly, regarding the oil flow in the water-cooled heat exchanger 30, the oil circulated through the automatic transmission 5 flows from the oil connection pipe 38 into the middle pipe Pm of the water-cooled heat exchanger 30 and flows through the middle pipe Pm. Then, it flows out from the oil connection pipe 39 and returns to the automatic transmission 5 (see the broken line arrows in FIGS. 4 and 7).

On the other hand, with respect to the flow of the cooling water in the water-cooled heat exchanger 30, the cooling water flowing in from the thermostat 12 side flows separately into the inner pipe Pi and the outer pipe Po sandwiching the inner pipe Pm from inside and outside, and at the downstream end. It merges again and is sucked into the water pump 10 (see solid line arrows in FIGS. 4 and 7).
In the water-cooled heat exchanger 30, the oil flow is in the same direction as the cooling water flow, but they may be in opposite directions.

FIG. 7 is a schematic explanatory diagram of the cooling water circulation path.
The connecting pipe 20 in which the water-cooled heat exchanger 30 is installed is disposed in the V-bank internal space S of the V-type internal combustion engine 1, and a water pump 10 is provided on the right side of the connecting pipe 20 and a thermostat 12 is provided on the left side. .

  With reference to the solid line arrow in FIG. 7, the cooling water discharged from the water pump 10 circulates through the water jackets of the cylinders 2F and 2R and the cylinder heads 3F and 3R through the discharge passage 21, and exits to the water supply passage 22 to become a thermostat. To 12.

  A water supply pipe 23 is connected to the radiator 13 from the thermostat 12 and cooling water is sent to the radiator 13. A water supply pipe 24 is connected to the connecting pipe 20 from the radiator 13 and the cooling water passing through the radiator 13 is supplied to the water supply pipe 24 and The water pump 10 is sucked through the connecting pipe 20.

  A bypass water passage 25 is connected between the thermostat 12 and the upstream side of the connecting pipe 20, and the water connection from the water supply pipe 23 to the radiator 13 or the direct connection from the bypass water passage 25 without passing through the radiator 13 by switching the valve of the thermostat 12. Either water supply to the V-type internal combustion engine 1 through the pipe 20 and the water pump 10 is selected.

The oil pipes 42 and 43 extending from the automatic transmission 5 are connected to the oil connection pipes 38 and 39 of the water-cooled heat exchanger 30 built in the connecting pipe 20, and the oil circulating through the automatic transmission 5 is oil pipe 42. Then, it enters the middle pipe Pm of the water-cooled heat exchanger 30 and is cooled or heated by the cooling water and returned to the automatic transmission 5 through the oil pipe 43 (see the broken line arrow in FIG. 7).
This oil circulation is performed by an oil pump (not shown).

  During the warming-up operation immediately after the internal combustion engine 1 is started, the thermostat 12 closes the valve to the water supply pipe 23, and the cooling water from the internal combustion engine 1 passes through the bypass pipe 25 directly through the connecting pipe 20 without passing through the radiator 13. Therefore, the oil is warmed in the water-cooled heat exchanger 30 built in the connecting pipe 20 by the cooling water whose temperature has increased with the operation of the internal combustion engine 1.

  During running, the thermostat 12 opens the valve to the water supply pipe 23, and the cooling water flowing out from the internal combustion engine 1 to the thermostat 12 flows through the connecting pipe 20 via the radiator 13. Oil is cooled in the water-cooled heat exchanger 30 by water.

Since the water-cooled heat exchanger 30 is located in the V-bank internal space S of the V-type internal combustion engine 1, it can be expected to perform required heat exchange without being affected by the traveling wind.
In addition, the connecting pipe 20 directly upstream of the water pump 10 communicating with the thermostat 12 is a pipe through which the entire amount of cooling water always flows, and the flow of the cooling water sucked into the water pump 10 has a high flow rate and is stable. Therefore, the water-cooled heat exchanger 30 built in the connecting pipe 20 can efficiently perform heat exchange even when the oil is cooled or heated.

  The water-cooled heat exchanger 30 has a triple pipe structure, and the cooling water flows through the inner pipe Pi and the outer pipe Po that sandwich the middle pipe Pm through which the oil flows from inside and outside. The heat exchange efficiency is extremely excellent when sandwiched between flows.

  Therefore, it is possible to quickly optimize the oil temperature and improve fuel efficiency and emission performance in any operating state of the internal combustion engine 1.

Since the water-cooled heat exchanger 30 is installed in the connecting pipe 20 disposed in the space S between the V banks, it can be easily applied to a general V-type internal combustion engine and is excellent in versatility.
In addition, a water-cooled heat exchanger is provided by effectively using the V-bank space S, which is a dead space, and contributes to downsizing of the internal combustion engine.

  In the above embodiment, the water-cooled heat exchanger 30 cools and heats the oil circulating in the automatic transmission 5, but it can also be used for heat exchange by introducing the oil circulating in the internal combustion engine 1. Applicable.

  Further, a water-cooled heat exchanger for oil circulating in the automatic transmission 5 is separated from the main water-cooled heat exchanger 30 disposed in the V-bank internal space S of the V-type internal combustion engine 1. A heat exchanger is installed separately, and an oil passage is connected so that the internal-combustion-engine-side water-cooled heat exchanger 30 and the radiator-side heat exchanger are in parallel, and the oil passage to the radiator-side water-cooled heat exchanger opens and closes A valve may be provided and controlled.

  Normally, the on-off valve is closed to close the oil passage to the radiator-side water-cooled heat exchanger, and the internal combustion engine water-cooled side heat exchanger 30 is used to warm the oil during warm-up operation as described above, Cool down.

In particular, when the internal combustion engine 1 is operated at a high load, such as during climbing, the on-off valve is opened so that the oil flows to the radiator-side water-cooled heat exchanger, and the oil is strongly supplied by the two water-cooled heat exchangers. Allow to cool.
Thus, the oil temperature can be optimized even during high-load operation, and the fuel consumption can be further improved by reducing the operating frequency of the fan motor.

It is the perspective view which abbreviate | omitted the V-type internal combustion engine which concerns on one embodiment of this invention. It is the same top view. It is a rear view of this water cooling type heat exchanger. It is the IV-IV sectional view taken on the line in FIG. It is the VV sectional view taken on the line in FIG. It is the VI-VI sectional view taken on the line in FIG. It is a schematic explanatory drawing of a cooling water circulation path. It is the conceptual diagram seen from the front of the conventional V type internal combustion engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... V type internal combustion engine, 2 ... Cylinder block, 2F ... Front cylinder row, 2R ... Rear cylinder row, 3F ... Front cylinder head, 3R ... Rear cylinder head, 5 ... Automatic transmission,
10 ... Water pump, 11 ... Water passage, 12 ... Thermostat, 13 ... Radiator,
20 ... Connecting pipe, 21 ... Discharge passage, 22 ... Water supply passage, 23 ... Water supply pipe, 24 ... Water supply pipe, 25 ... Bypass water passage,
30 ... Water-cooled heat exchanger, 31 ... Inner pipe, 32 ... Middle pipe, 33 ... Outer pipe, 35, 36 ... Closure member, 37 ... Metal fin, 38, 39 ... Oil connection pipe, 40 ... Ring seal member, 41 ... Fasteners, 42, 43 ... Oil pipes, Pi ... Inner pipes, Pm ... Middle pipes, Po ... Outer pipes.

Claims (3)

In a V-type internal combustion engine in which a plurality of cylinders are arranged to be inclined in a V shape,
A connecting pipe communicating with the water pump of the cooling water passage and the thermostat is disposed in the V bank internal space of the V type internal combustion engine;
A heat exchanger arrangement structure for a V-type internal combustion engine, wherein a water-cooled heat exchanger for exchanging heat with lubricating oil is provided in the connecting pipe. The water-cooled heat exchanger is
It has a triple pipe structure consisting of an inner pipe, an outer middle pipe and an outer outer pipe,
The cooling pipe passes through the inner pipe line inside the inner pipe and the outer pipe line between the inner pipe and the outer pipe, and the oil passes through the inner pipe line between the inner pipe and the inner pipe. The heat exchanger arrangement structure for a V-type internal combustion engine according to claim 1, wherein The V-type internal combustion engine is
The heat exchanger arrangement structure for a V-type internal combustion engine according to claim 1 or 2, wherein the crankshaft is mounted on the vehicle in a horizontal position with the crankshaft directed in the left-right direction of the vehicle body.

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