JP3263548B2 - Cooler for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cooler for cooling cooling water, oil and air attached to an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, cooling water, oil and air of an internal combustion engine have been led to a cooler via a pipe. However, if the temperature of the engine is too low, the engine will be overcooled and the efficiency will be deteriorated. Therefore, the heat exchanger is bypassed to the bypass passage.
For example, as shown in FIG. 5, a piping 26 is provided on the outer periphery of the cooler 25 to form a bypass passage. Further, as in the technique of Japanese Utility Model Publication No. 6-3128, a bypass passage is provided along the outer wall of the cooler core.

[0003]

However, in the former case, since piping is required, the bypass path becomes long, the number of parts increases, the structure becomes complicated, and it becomes difficult to make a compact design. I was Also, in the latter case, since the bypass passage and a part of the cooler core are in contact with each other via the partition wall, even when passing through the bypass passage without cooling, heat is taken from the partition wall so as to be cooled. Had become.

[0004]

The present invention uses the following means to solve the above-mentioned problems. That is, a fresh water inlet (12) and a fresh water outlet (2)
0) are arranged in opposite directions of the fresh water cooler (1), and a bypass passage (16) is provided parallel to the outside of the heat exchanger case (2), and the bypass passage (16) and the heat exchanger case (2) are provided. An air passage (23) is formed between a heat exchanger case (2) and a bypass passage (16) in a fresh water cooler provided with a valve element (14) for switching inflow to the water.

Further, the heat exchanger case (2), the bypass passage (16) and the air passage (23) are integrally formed.

[0006]

According to the first aspect of the present invention, the heat insulating layer is formed between the bypass passage and the heat exchanger by the air passage formed in the wall of the heat exchanger case without passing through a separate pipe. Thus, the temperature rise of the high-temperature side cooling water during the warm-up operation is promoted.

[0007] According to the second aspect of the invention, it is manufactured in the casting, cut with integrally manufacturing work by the cast excl.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a fresh water cooler, FIG. 2 is a front sectional view of the same, FIG. 3 is a side view of the same, and FIG.
It is arrow sectional drawing.

The fresh water cooler 1 is disposed above the engine E, and has a cylindrical heat exchanger case 2 and a plurality of cooling water pipes 3, 3... An outer peripheral wall 4 formed on the outer periphery of the exchanger case 2 and end walls 5 and 6 for closing both ends of the heat exchanger case 2 are provided. The cooling water pipes 3 are connected to the end walls 5.6.・ Both ends are fitted. As shown in FIG. 2, covers 9 and 10 are attached to both ends of the heat exchanger case 2. A cooling water inlet 7 is provided below the left cover 9 and a cooling water outlet 8 is provided above the right cover 10. Are connected to each other, and a piping communicating with the cooling water inlet 7 is connected to a cooling water pump (not shown) to pump cooling water such as seawater.

In the cover 9, 1/3 from the bottom
Partition 9a in the position of about 1/3 in the cover 10 from the top
A partition wall 10a is formed at a position corresponding to the cooling water pipe 3.3.
Are divided into three groups, upper and lower, and the cooling water enters the cover 9 from the cooling water inlet 7 as shown by a solid arrow a,
The cooling water pipes 3, 3,... Reach the cover 10 from the lower cooling water pipes 3, 3,... Again enter the cover 9, and the cooling water pipes 3, 3,. The flow path of the cooling water is made longer by discharging the water from the water outlet 8.

A branch chamber 13 is formed on the left side between the outer peripheral wall 4 and the heat exchanger case 2, and a fresh water inlet 12 is formed at the rear of the branch chamber 13, as shown in FIGS. 1 and 3. Then, as shown by a dotted arrow b, it flows from the cylinder head, and as shown by a dotted arrow c, it flows into the fresh water inlet 12 from an exhaust manifold described later. As shown in FIG. 4, a thermostat 14 serving as a valve is disposed in the branch chamber 13 between a passage 19 that enters the heat exchanger case 2 through the communication port 17 and the bypass passage 16. Thermostat 1 when engine E is cold
4 is actuated and opened, the fresh water flows into the bypass passage 16,
When warmed, the thermostat 14 is activated and closed, and the passage 19 is closed.
And flows into the heat exchanger case 2 through the communication port 17 opened on the front side of the heat exchanger case 2.

The partition plates 11, 11... Are alternately arranged vertically in the heat exchanger case 2 in a staggered manner, and fresh water flows in from the communication port 17 on the left side, and the partitions are separated. Flow in a zigzag shape by the plates 11
The heat is exchanged by the cooling water pipes 3, 3... To be cooled, and the water flows from the right communication port 18 to the fresh water outlet 20 to the pump. The bypass passage 16 is also connected to the fresh water outlet 20. A fresh water supply port 21 is provided in the upper center of the outer peripheral wall 4 and the reservoir tank 2 is provided on the right side.
It is communicated with 2.

In the present invention, an air passage 23 is formed in the longitudinal direction between the bypass passage 16 and the heat exchanger case 2, and the air passage 23 forms a heat insulating layer. Heat is not easily exchanged between the case 2 and the bypass passage 16. Conventionally, since the heat insulating layer was not provided, heat was exchanged and cooled when the cold water was bypassed, resulting in supercooling, and the warm-up operation at the time of starting the engine was not performed well.

The fresh water cooler structure such as the heat exchanger case 2 and the outer peripheral wall 4 is manufactured by casting, and the air passage 23 is integrally manufactured by casting at the same time when the whole is manufactured. A heat insulating layer can also be formed by inserting glass wool or the like therein as a cavity.

FIG. 6 is a front view of the engine, FIG. 7 is a partial cross-sectional view taken along the line BB in FIG. 6, FIG. 8 is an exploded perspective view of the oil cooler, FIG.
FIG. 10 is a partial perspective view of a turbulence generation plate, and FIG. 11 is a partial perspective view of an embodiment in which a turbulence generation projection is provided on a main body case.

An oil cooler 30 is provided in front of the engine E.
The oil cooler 30 is a multi-plate cooler, and a core 32 in which plate-shaped fins 32a are overlapped in a front-rear direction in a main body case 31 is inserted. A cooling water inlet 33 is provided on the right side of the case 31 and is connected to a pipe 34. The pipe 34 is connected to a water pump 35. A cooling water outlet 36 is provided on the left side of the main body case 31 so as to return to the fresh water cooler 1. A lubricating oil inlet is provided on the right side of the main body case 31, a strainer 37 is connected to the inlet, and an outlet is provided on the left side, and connected to a lubricating oil passage in the engine E. In the main body case 31, the oil is supplied to the central portion of the core 32 and cooled.

A turbulence generating plate 39 as shown in FIG. 10 is arranged between the inner surface of the main body case 31 and the outer side of the core 32. The turbulent flow generating plate 39 is made of an elastic material such as rubber. Are provided on the front surface, and rear ribs 39b are provided on the back surface. The protrusion 39a is disposed in a gap between the main body case 31 and the core 32. Without the protrusion 39a, the cooling water easily flows, the amount of the cooling water passing through the core decreases, and the cooling efficiency deteriorates.
The projections 39a provide resistance to the flow of the cooling water, so that the cooling water passes between the cores 32 to increase the cooling efficiency. The rear rib 39b plays a role of damping the cooling water from flowing into the gap between the main body case 31 and the turbulence generating plate 39. Also, instead of interposing the turbulence generating plate 39, as shown in FIG.
The turbulence generation projections 31a
a may be provided to generate resistance to the cooling water flowing through the gap between the main body case 31 and the core 32.

FIG. 12 is a front view of the intake silencer, and FIG.
14 is a plan view, FIG. 14 is a sectional view taken along the line CC in FIG. 13, FIG. 15 is an exploded schematic perspective view, FIG. 16 is an exploded schematic perspective view of an intercooler, FIG. 17 is a front view of an intercooler, and FIG. FIG. 19 is a side view, and FIG. 20 is a sectional view taken along the line DD in FIG.

As shown in FIGS. 12 to 15, the intake silencer 45 includes an upper intake duct 44 and an intake manifold 4.
6 is housed between the connection portions of the intake silencer 45.
6, a plate-like flange 45a partitioning between the
A cooling water passage 45b is provided at the center in the longitudinal direction of the cooling water passage 5a, and muffler pipes 45c, 45c,. The flange 45a has the same size as the flanges of the intake duct 44 and the intake manifold 46, and the cooling water passage 45b communicates with the fresh water cooler 1,
The muffler pipe 45c communicates between the intake duct 44 and the intake manifold 46, so that the muffler pipe 45c is connected to the intake manifold 4 through the muffler pipes 45c.
When it enters 6, it expands to obtain a silencing effect.

The intake duct 44 has a lower portion as a flange portion 44a, which can be fixed to the flange 45a. An intake port 44b is opened at an upper portion so that air can be taken in. A cover 47 is provided on the intake port 44b. Is attached. The cooling water passage 45b is provided on the right side of the intake duct 44.
Is inserted into an insertion hole 44c. Also,
The intake manifold 46 has a flange 46 around its upper part.
a so that it can be fixed to the flange 45a,
On the rear surface, communication ports 46b and 46 communicating with the cylinder head are provided.
are provided so that air can be sent, and an insertion hole 46c for inserting the cooling water passage 45b is opened on the left side surface.

The intercooler of the supercharger can be obtained by simply exchanging the intake silencer 45 and the cover 47 while keeping the cooling pipes connected to the intake duct 44, the intake manifold 46, and the cooling water passage 45b.
That is, as shown in FIGS.
A communication pipe 50 is connected to the suction port 44b of the fourth turbocharger 4, and the other end of the communication pipe 50 is connected to the compressor side of the supercharger 49. Then, by merely interposing the intercooler core 51 between the intake duct 44 and the intake manifold 46 instead of the intake silencer 45, an intercooler for a supercharger can be configured. The intake manifold 46 is connected to the cylinder head of the engine E, and the exhaust from the engine E is sent from the exhaust manifold 52 to the turbocharger side of the supercharger 49.

As shown in FIG. 8, a mist removal pipe 29 is connected to the engine E through a hole 28a opened on the side of the cylinder block 28. The mist removal pipe 29 is for discharging mist such as oil droplets of lubricating oil and leaked combustion gas from the crankcase of the diesel engine, but if it is discharged as it is, the surroundings of the engine E become dirty.
The gas containing mist is caused to collide with the inner wall of the mist removal pipe 29 to form a liquid, and this liquid is intended to be discharged from the drain by its own weight. The configuration of the mist removal pipe 29 is shown in FIGS.
As shown in FIG. 34, the mist is separated to prevent the liquid from flowing back into the engine E.

More specifically, in FIG. 21, an annular projection 29b is provided substantially at the center of the drain reservoir where the drain hole 29a is located. In FIG. 22, the annular projection 29b is inclined toward the engine. In FIG. 23, the annular projection 29b is formed in an eaves shape. FIG. 24 shows the angle of the eave-shaped annular projection 29b. In FIG. 25, an annular projection 29c is formed on the inner wall on the entrance side. FIG. 26 shows a combination of the annular projection 29b and the annular projection 29c. FIG.
Has an annular projection 29d on the inner wall just before the exit. FIG.
8 has a plurality of annular projections 29d. FIG. 29 combines an annular projection 29c and an annular projection 29d. FIG.
Combines the annular projection 29c and the plurality of annular projections 29d. In FIG. 31, the annular projection 29d is angled.
FIG. 32 shows an angled annular projection 29d and an annular projection 29c.
Are combined. FIG. 33 shows an angled annular projection 2
9d are provided in plurality. FIG. 34 combines an annular projection 29c with a plurality of annular projections 29d angled.

[0024]

The present invention has the following advantages because it is constructed as described above. That is, since it is configured as in claim 1, pipes separate becomes unnecessary, as possible out be made compact and lightweight. Further, the heat insulation effect can be improved by the air passage formed in the wall of the heat exchanger case 2, and the temperature rise of the high-temperature side cooling water during the warm-up operation is promoted.

[0025] Having constructed as claimed in claim 2, when prepared by casting, as possible out be manufactured integrally by casting vent.

[Brief description of the drawings]

FIG. 1 is a plan view of a shimizu cooler.

FIG. 2 is a front sectional view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a sectional view taken along the line AA in FIG. 2;

FIG. 5 is a plan view of a conventional fresh water cooler.

FIG. 6 is a front view of the engine.

FIG. 7 is a partial sectional view taken along the line BB in FIG. 6;

FIG. 8 is an exploded perspective view of the oil cooler.

FIG. 9 is a side sectional view of the oil cooler.

FIG. 10 is a partial perspective view of a turbulence generating plate.

FIG. 11 is a partial perspective view of an embodiment in which a turbulence generating projection is provided on a main body case.

FIG. 12 is a front view of the intake silencer.

FIG. 13 is a plan view of the same.

FIG. 14 is a sectional view taken along the line CC in FIG.

FIG. 15 is an exploded schematic perspective view of the same.

FIG. 16 is an exploded schematic perspective view of an intercooler.

FIG. 17 is a front view of the intercooler.

FIG. 18 is a plan view of the same.

FIG. 19 is a side view of the same.

FIG. 20 is a sectional view taken along the line DD in FIG. 18;

FIG. 21 is a sectional view showing a first embodiment of the mist removal pipe 29.

FIG. 22 is a sectional view showing a second embodiment of the mist removal pipe 29.

FIG. 23 is a sectional view showing a third embodiment of the mist removal pipe 29.

FIG. 24 is a sectional view showing a fourth embodiment of the mist removal pipe 29.

FIG. 25 is a sectional view showing a fifth embodiment of the mist removal pipe 29.

FIG. 26 is a sectional view showing a sixth embodiment of the mist removal pipe 29.

FIG. 27 is a sectional view showing a seventh embodiment of the mist removal pipe 29.

FIG. 28 is a sectional view showing an eighth embodiment of the mist removal pipe 29.

FIG. 29 is a sectional view showing a ninth embodiment of the mist removal pipe 29.

FIG. 30 is a sectional view showing a mist removal pipe 29 according to a tenth embodiment.

FIG. 31 is a sectional view showing an eleventh embodiment of the mist removal pipe 29.

FIG. 32 is a sectional view showing a twelfth embodiment of the mist removal pipe 29.

FIG. 33 is a sectional view showing a thirteenth embodiment of the mist removal pipe 29.

FIG. 34 is a sectional view showing a fourteenth embodiment of the mist removal pipe 29.

[Explanation of symbols]

 E engine 1 fresh water cooler 2 heat exchanger case 3 cooling water pipe 12 fresh water inlet 14 valve body (thermostat) 16 bypass passage 20 fresh water outlet 23 air passage

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F02B 29/04 F02B 29/04 L F02M 35/12 F02M 35/12 Z (72) Inventor Isao Taguchi Chaya Kita-ku, Osaka-shi, Osaka No. 1-32, Yanmar Diesel Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F01M 5/00 F01P 3/18 F01P 3/20 F01P 11/08 F02B 29/40 F02M 35 / 12

Claims (2)

(57) [Claims] 1. A fresh water inlet (12) and a fresh water outlet (20) are arranged in opposite directions of a fresh water cooler (1), respectively, and a bypass passage (16) is arranged in parallel with the outside of the heat exchanger case (2). And a valve element (14) for switching the flow into the bypass passage (16) and the heat exchanger case (2) is disposed between the heat exchanger case (2) and the bypass passage (16). A cooler for an internal combustion engine, wherein an air passage (23) is formed. 2. A cooler for an internal combustion engine according to claim 1, wherein said heat exchanger case (2), said bypass passage (16) and said air passage (23) are integrally formed.