JP7045303B2 - Engine with supercharger - Google Patents

Description

The present invention relates to an engine with a supercharger, and more particularly to an engine with a supercharger in which thermal deterioration of engine oil is suppressed.

Conventionally, there is an engine with a supercharger provided with a supercharger (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-151718 (see FIGS. 1 and 2)

Conventionally, there are the following problems.
In Patent Document 1, there is no means for efficiently cooling the engine oil, and the heat generated by the bearing portion of the supercharger causes the engine oil to overheat, and the engine oil tends to be thermally deteriorated.

An object of the present invention is to provide an engine with a supercharger in which thermal deterioration of engine oil is suppressed.

The main configurations of the present invention are as follows.
As illustrated in FIG. 1 (A), a supercharger (1), an oil supply passage (3) for supplying engine oil (2) to a bearing portion (1a) of the supercharger (1), and a supercharger. It is equipped with an oil discharge passage (4) for discharging engine oil (2) from the bearing portion (1a) of the machine (1) and an air-cooled oil cooler (5).
An air-cooled oil cooler (5) is provided in the oil discharge passage (4), and engine oil (2) discharged from the bearing portion (1a) of the turbocharger (1) passes through the air-cooled oil cooler (5). It is configured to be cooled by the cooling air (11a).
As illustrated in FIG. 1B, the air-cooled oil cooler (5) is composed of an outer cylinder (5a) and an inner cylinder (5b), and is inside the inner cylinder (5b), inside the inner cylinder (5b), and outside. It is configured so that the engine oil (2) passes through one of the cooler jackets (5c) between the cylinders (5a) and the cooling air (11a) passes through the other.
As illustrated in FIG. 1A, an engine cooling fan (11) is provided, and as the cooling air (11a), an engine cooling air (11b) generated by the engine cooling fan (11) is used.
The air-cooled oil cooler (5) is arranged in the air passage (12) of the engine cooling air (11b) generated by the engine cooling fan (11), and has a cooling air introduction port (5e) and a cooling air discharge port (5f). Equipped with
The cooling air inlet (5e) is directed to the upstream side of the air passage (12).
An engine with a supercharger, characterized in that the cooling air discharge port (5f) is directed to the downstream side of the air passage (12).

The present invention has the following effects.
<< Effect >> Thermal deterioration of engine oil (2) is suppressed.
As illustrated in FIG. 1 (A), the high temperature engine oil (2) discharged from the bearing portion (1a) of the booster (1) to the oil discharge passage (4) is inside the air-cooled oil cooler (5). Therefore, heat is exchanged with the cooling air (11a) at a high temperature difference, the cooling efficiency of the engine oil (2) is high, and the thermal deterioration of the engine oil (2) is suppressed.
<< Effect >> The engine oil (2) is easily and efficiently cooled.
As illustrated in FIG. 1B, the engine oil (2) is easily and efficiently cooled by the air-cooled oil cooler (5) having a simple structure of the outer cylinder (5a) and the inner cylinder (5b).
<< Effect >> No need to add a new cooling source.
As illustrated in FIG. 1A, the engine oil (2) is cooled by the engine cooling air (11b) generated by the existing engine cooling fan (11) and does not require the addition of a new cooling source.
<< Effect >> The cooling efficiency of the engine oil (2) is high.
As illustrated in FIG. 1 (A), the engine cooling air (11b) flowing through the air passage (12) is pushed into the air-cooled oil cooler (5) from the cooling air introduction port (5e), and the air-cooled oil cooler. The engine cooling air (11b) in (5) is sucked out from the air-cooled oil cooler (5) by an eject action. Therefore, the speed of the engine cooling air (11b) passing through the air-cooled oil cooler (5) is high, and the cooling efficiency of the engine oil (2) is high.

It is a figure explaining the main part of the engine with a supercharger which concerns on embodiment of this invention, FIG. 1A is a schematic view of the side surface, and FIG. It is an enlarged view. It is a figure explaining the air-cooled oil cooler used in the engine of FIG. 1, FIG. 2A is a side view, and FIG. 2B is a front view. 2 is a view for explaining the air-cooled oil cooler and its peripheral portion, FIG. 3A is a side view, and FIG. 3B is a rear view. FIG. 3 is a plan view of FIG. It is a side view of the engine of FIG. It is a top view of the engine of FIG. It is a front view of the engine of FIG.

FIGS. 1 to 7 are views for explaining an engine with a supercharger according to an embodiment of the present invention, and in this embodiment, a water-cooled vertical in-line multi-cylinder diesel engine will be described.

As shown in FIGS. 5 to 7, this engine includes a cylinder block (14), a cylinder head (15) mounted on the upper part of the cylinder block (14), and a cylinder mounted on the upper part of the cylinder head (15). The head cover (16), the front cover (17) assembled to the front of the cylinder block (14), the engine cooling fan (11) arranged to the front of the cylinder head (15), and the cylinder block (14). It is equipped with an oil pan (18) assembled at the bottom of the cylinder block (14) and a fly wheel (19) located at the rear of the cylinder block (14). Reference numeral (58) in FIG. 5 is a starter.
Regarding this engine, the erection direction of the crank shaft (not shown) is described as the front-rear direction, the engine cooling fan (11) side is the front, the flywheel (19) side is the rear, and the horizontal direction orthogonal to the front-rear direction is the lateral direction. do.

This engine includes a fuel supply device (20), an intake device (21), an exhaust device (22) in FIG. 6, an engine water cooling device (7), a lubrication device (23), and an oil cooling device in FIG. (24) is provided.

The fuel supply device (20) of FIG. 6 is a device that supplies fuel to a combustion chamber (not shown), and is a fuel injection pump (25) and a fuel injection pipe (26) connected to the fuel injection pump (25). And a fuel injector (27) connected to the fuel injection pipe (26).

The intake device (21) of FIG. 6 is a device that supplies air to the combustion chamber, and is connected to an air cleaner (not shown), a first intake pipe (not shown) connected to the air cleaner, and a first intake pipe. Air from the blow-by gas supply chamber (28), the second intake pipe (29) connected to the blow-by gas supply chamber (28), and the turbocharger (1) connected to the second intake pipe (29). It includes a compressor (1b), a supercharging pipe (30) connected to the air compressor (1b), and an intake manifold (31) connected to the supercharging pipe (30).
The blow-by gas supply chamber (28) is a chamber for recirculating blow-by gas from the breather chamber (not shown) in the cylinder head cover (16) to the intake air, and is provided on the ceiling of the cylinder head cover (16).

The supercharger (1) of FIG. 6 is a device that supercharges the intake manifold (31), and is between the exhaust turbine (1c) connected to the exhaust manifold (32), the air compressor (1b), and the like. It is provided with a bearing portion (1a) of a turbine shaft (not shown) located at.
The exhaust device (22) of FIG. 6 is a device that exhausts the exhaust gas from the combustion chamber, and is a device that exhausts the exhaust gas from the combustion chamber, and is the exhaust turbine (1c) and the exhaust muffler (1c) of the exhaust manifold (32) and the supercharger (1) following the exhaust manifold (32). It is provided with an exhaust lead path (33) including (not shown) and the like.

The lubrication device (23) of FIG. 1A is a device for lubricating an engine sliding portion (34) such as a bearing of a crank shaft, and is an oil pan (18) and an engine oil (2) collected in the oil pan (18). ), An oil pump (36), an oil filter (37), and an engine oil (2) purified by the oil filter (37) are supplied to the engine sliding portion (34). It is provided with an oil gallery (38) to be lubricated and a bearing lubrication passage (39) for lubricating the bearing portion (1a) of the booster (1).

The bearing lubrication passage (39) of FIG. 1A has an oil supply passage (3) for supplying engine oil (2) to the bearing portion (1a) of the turbine shaft of the booster (1) and a bearing portion (1a). ) Is provided with an oil discharge passage (4) for discharging the engine oil (2).
The oil supply passage (3) is a passage branched from the oil gallery (38), and the end is connected to the upper part of the bearing portion (1a) of the turbocharger (1).
The oil discharge passage (4) is led out from the lower part of the bearing portion (1a) of the turbocharger (1), the end portion is connected to the cylinder block (14), and the bearing portion (1a) of the turbocharger (1) is connected. The engine oil (2) discharged from the engine oil (2) is configured to return to the oil pan (18) via the oil discharge passage (4).

The engine water cooling device (7) of FIG. 1A is a device for cooling the engine, and has a radiator (8) that dissipates heat from the engine cooling water (6) and an engine cooling water (6) that dissipates heat from the radiator (8). ), A cooling water pump (40) that sucks and pumps it to the cylinder jacket (9), a cylinder jacket (9), a cylinder head jacket (10) that communicates with the cylinder jacket (9), and a cylinder head jacket (10). A water flange (52) having a built-in thermostat valve (41) for controlling the return of the engine cooling water (6) from the radiator (8) to the radiator (8) and its stop, and the engine cooling water (6) of the cylinder head jacket (10). The return pipe (56) of FIG. 6 is provided for returning water from the water flange (52) to the cooling water pump (40).

In the engine water cooling device (7) of FIG. 1, while the temperature of the engine cooling water (6) is relatively low, the total amount of the engine cooling water (6) is shown in FIG. 6 due to the closing of the thermostat valve (41). It is sucked into the cooling water pump (40) from the return pipe (56), bypasses the radiator (8), and circulates the cooling water pump (40), the cylinder jacket (9), and the cylinder head jacket (10) in that order. , The engine is warmed up.
When the temperature of the engine cooling water (6) rises, the engine cooling water (6) becomes the radiator (8), the cooling water pump (40), the cylinder jacket (9), and the cylinder head due to the opening of the thermostat valve (41). The engines are cooled by circulating between the jackets (10) in that order. A part of the engine cooling water (6) is sucked into the cooling water pump (40) from the return pipe (56) of FIG. 6 and bypasses the radiator (8).

The cooling water pump (40) of FIG. 1A is arranged in front of the cylinder head (15), and has a water pump case (53), an impeller (42) housed in the water pump case (53), and an impeller. The input shaft (43) of (42) is provided.
An input pulley (44) attached to the input shaft (43) and an engine cooling fan (11) attached to the input pulley (44) are arranged in front of the water pump case (53). The input pulley (44) is interlocked with the crank pulley (57) of FIGS. 5 and 7 via the fan belt (45), and the impeller (42) and the engine cooling fan (11) are connected via the fan belt (45). It is driven by the crank pulley (57). Reference numerals (59) in FIGS. 3 (A) to 7 (59) are alternators that also serve as belt tensioners. A generator may be used instead of the alternator.

The radiator (8) of FIG. 1A is arranged in front of the engine cooling fan (11), and has an upper tank (46), a lower tank (47), and a heat radiation tube (48) provided between them. It also has a cooling water inlet (49) for introducing the engine cooling water (6) into the upper tank (46), and a cooling water outlet (50) for drawing out the engine cooling water (6) from the lower tank (47).
The cooling water inlet (49) of the radiator (8) is connected to the water flange (52) via the cooling water introduction hose (51), and the cooling water outlet (50) of the radiator (8) is a cold water outlet hose (54). It is connected to the pump inlet (55) of the cooling water pump (40) via.

The cylinder jacket (9) of FIG. 1 (A) is provided in a cylinder block (14), and is a cylinder (not shown) or a piston (not shown) in a cylinder (not shown) by engine cooling water (6) passing through the cylinder jacket (9). (Not shown) is cooled.
The cylinder head jacket (10) is provided in the cylinder head (15), and the cylinder head (15) is cooled by the engine cooling water (6) passing through the cylinder head jacket (10).

The oil cooling device (24) of FIG. 1A is a device for cooling the engine oil (2), includes an air-cooled oil cooler (5), and the air-cooled oil cooler (5) is the oil discharge passage (4). The engine oil (2) discharged from the bearing portion (1a) of the booster (1) is configured to be cooled by the cooling air (11a) passing through the air-cooled oil cooler (5). There is.
As a result, the high-temperature engine oil (2) discharged from the bearing portion (1a) of the booster (1) to the oil discharge passage (4) becomes the cooling air (11a) in the air-cooled oil cooler (5). Heat is exchanged with a high temperature difference, the cooling efficiency of the engine oil (2) is high, and the thermal deterioration of the engine oil (2) is suppressed.
The air-cooled oil cooler (5) has a straight cylindrical shape, and is arranged on the side of the cylinder block (14) in a forward downward slope.

As shown in FIG. 1 (B), the air-cooled oil cooler (5) is composed of an outer cylinder (5a) and an inner cylinder (5b), and is inside the inner cylinder (5b), inside the inner cylinder (5b), and outside. Of the cooler jacket (5c) between the cylinders (5a), the engine oil (2) passes through the inner cylinder (5b), and the cooling air (11a) passes through the cooler jacket (5c). Has been done.
As a result, the engine oil (2) is easily and efficiently cooled by the air-cooled oil cooler (5) having a simple structure of the outer cylinder (5a) and the inner cylinder (5b).
The air-cooled oil cooler (5) may be configured such that the cooling air (11a) passes through the inner cylinder (5b) and the engine oil (2) passes through the cooler jacket (5c).

As shown in FIG. 1A, the engine cooling fan (11) is provided, and the engine cooling air (11b) generated by the engine cooling fan (11) is used as the cooling air (11a).
As a result, the engine oil (2) is cooled by the engine cooling air (11b) generated by the existing engine cooling fan (11), and no new cooling source needs to be added.

As shown in FIG. 1 (A), the air-cooled oil cooler (5) is arranged in the air passage (12) of the engine cooling air (11b) generated by the engine cooling fan (11), and the cooling air inlet (5) is arranged. 5e) and a cooling air outlet (5f) are provided, the cooling air introduction port (5e) is directed to the upstream side of the air passage (12), and the cooling air exhaust port (5f) is the air passage (12). It is directed to the downstream side of.
As a result, the engine cooling air (11b) flowing through the air passage (12) is pushed into the air-cooled oil cooler (5) from the cooling air inlet (5e), and the engine cooling air in the air-cooled oil cooler (5). (11b) is sucked out from the air-cooled oil cooler (5) by an eject action. Therefore, the speed of the engine cooling air (11b) passing through the air-cooled oil cooler (5) is high, and the cooling efficiency of the engine oil (2) is high.

As shown in FIG. 7, the engine cooling air (1b) generated by the engine cooling fan (11) has a gap between the front cover (17) and the alternator (59) and a gap between the alternator (59) and the oil filter (37). After passing through, as shown in FIG. 5, it passes backward through the lateral side of the cylinder block (14), and the air passage (12) is formed on the lateral side of the cylinder block (14).

As shown in FIG. 1 (A), the cooling air introduction port (5e) is widened toward the upstream side of the air passage (12).
As a result, the engine cooling air (11b) collected at the cooling air introduction port (5e) is pushed into the air-cooled oil cooler (5). Therefore, the speed of the engine cooling air (11b) passing through the air-cooled oil cooler (5) is high, and the cooling efficiency of the engine oil (2) is high.

The outer cylinder (5a) of the air-cooled oil cooler (5) is made of metal, and as shown in FIG. 1A, the outer peripheral surface thereof is exposed to the engine cooling air (11b) in the air passage (12). ing.
As a result, the engine cooling air (11b), which has become hot due to heat exchange with the high temperature engine oil (2), passes through the cooler jacket (5c) of the air-cooled oil cooler (5), and the outer cylinder (5a). ) Is air-cooled by the engine cooling air (11b) flowing along the outer peripheral surface, and the cooling efficiency of the engine oil (2) is high.
When the engine oil (2) is allowed to pass through the cooler jacket (5c), the high temperature engine oil (2) itself is in the process of passing through the cooler jacket (5c) of the air-cooled oil cooler (5). , Air-cooled by the engine cooling air (11b) flowing along the outer peripheral surface of the outer cylinder (5a).

The oil supply passage (3) is composed of a metal oil supply pipe (3a), and as shown in FIGS. 3 (A) and 3 (A) and 5, the outer peripheral surface thereof is in the air passage (12), and the engine cooling air (11b) ) Is exposed.
As a result, the engine oil (2) immediately before introduction into the bearing portion (1a) of the turbocharger (1) is air-cooled by the engine cooling air (11b), and the cooling efficiency of the bearing portion (1a) of the turbocharger (1) is cooled. Is high.
The oil supply pipe (3a) is fixed to the air-cooled oil cooler (5) by a clamp (60) along the outer cylinder (5a) of the air-cooled oil cooler (5).

As shown in FIG. 1 (B), the inner cylinder (5b) of the air-cooled oil cooler (5) is composed of folds whose peripheral walls are folded inward and outward when viewed in a direction parallel to the central axis (5d). ing.
As a result, the surface area of the inner cylinder (5b), which is the boundary surface for heat exchange, is expanded by the folds, and the cooling efficiency of the engine oil (2) is high.
The outer cylinder (5a) and inner cylinder (5b) of the air-cooled oil cooler (5) are concentric double cylinders, and the inner cylinder (5b) has a central axis (5d) from the position where the peripheral wall thereof is at a predetermined angle in the circumferential direction. ) Is folded inward.

The contents of the embodiment of the present invention are as described above, but the present invention is not limited to this embodiment.
For example, in this embodiment, the oil cooling device (24) uses a single air-cooled oil cooler (5) as a heat exchanger, but the engine oil (38) supplied from the oil pump (36) to the oil gallery (38). A water-cooled oil cooler for cooling 2) or another air-cooled oil cooler may be provided as a heat exchanger. In this case, the air-cooled oil cooler (5) saves labor and makes the other oil cooler more compact, and when the other oil cooler is arranged between the oil filter (37) and the front cover (17), the air-cooled oil cooler (5) is used. As the thickness is reduced, the amount of protrusion of the oil filter (37) from the front cover (17) becomes smaller.

(1) ... Supercharger, (1a) ... Bearing part, (2) ... Engine oil, (3) ... Oil supply passage, (3a) ... Oil supply pipe, (4) ... Oil discharge passage, (5) ... Air-cooled oil cooler, (5a) ... outer cylinder, (5b) ... inner cylinder, (5c) ... cooler jacket, (5d) ... central axis, (5e) ... air inlet, (5f) ... air outlet, ( 11) ... engine cooling fan, (11a) ... cooling air, (11b) ... engine cooling air, (12) ... air passage.

Claims (5)

From the turbocharger (1), the oil supply passage (3) that supplies the engine oil (2) to the bearing portion (1a) of the turbocharger (1), and the bearing portion (1a) of the turbocharger (1). Equipped with an oil discharge passage (4) for discharging engine oil (2) and an air-cooled oil cooler (5).
An air-cooled oil cooler (5) is provided in the oil discharge passage (4), and engine oil (2) discharged from the bearing portion (1a) of the turbocharger (1) passes through the air-cooled oil cooler (5). It is configured to be cooled by the cooling air (11a).
The air-cooled oil cooler (5) is composed of an outer cylinder (5a) and an inner cylinder (5b), and is a cooler jacket (5c) inside the inner cylinder (5b) and between the inner cylinder (5b) and the outer cylinder (5a). ), The engine oil (2) passes through one of them, and the cooling air (11a) passes through the other .
The engine cooling fan (11) is provided, and the engine cooling air (11b) generated by the engine cooling fan (11) is used as the cooling air (11a).
The air-cooled oil cooler (5) is arranged in the air passage (12) of the engine cooling air (11b) generated by the engine cooling fan (11), and has a cooling air introduction port (5e) and a cooling air discharge port (5f). Equipped with
The cooling air inlet (5e) is directed to the upstream side of the air passage (12).
An engine with a supercharger, characterized in that the cooling air discharge port (5f) is directed to the downstream side of the air passage (12). In the engine with a supercharger according to claim 1 ,
The cooling air inlet (5e) is an engine with a supercharger, which is widened toward the upstream side of the air passage (12). In the engine with a supercharger according to claim 1 or 2 .
The outer cylinder (5a) of the air-cooled oil cooler (5) is made of metal, and the outer peripheral surface thereof is exposed to the engine cooling air (11b) in the air passage (12). Engine with turbocharger. In the engine with a supercharger according to any one of claims 1 to 3 .
The oil supply passage (3) is composed of a metal oil supply pipe (3a), and the outer peripheral surface thereof is exposed to the engine cooling air (11b) in the air passage (12). Engine with supercharger. In the engine with a supercharger according to any one of claims 1 to 4 .
The inner cylinder (5b) of the air-cooled oil cooler (5) is supercharged, characterized in that the peripheral wall is composed of folds folded inward and outward when viewed in a direction parallel to the central axis (5d). Machined engine.

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