JP2020109267A - Engine with supercharger - Google Patents

Abstract

To provide an engine with a supercharger for hardly causing the heat deterioration of engine oil 2.SOLUTION: The engine with the supercharger includes the supercharger 1, an oil supply passage 3 for supplying the engine oil 2 to a bearing 1a of the supercharger 1, and an oil discharge passage 4 for discharging the engine oil 2 from the bearing 1a of the supercharger 1, the oil discharge passage 4 including a discharge side oil cooler 4b having an oil storage part 4a. In the oil storage part 4a, the predetermined amount of engine oil 2 is pooled during engine operation. The engine oil 2 overflowing from the oil storage part 4a flows down from the discharge side oil cooler 4b. The discharge side oil cooler 4b includes a spiral pipe 4d having an inclined or horizontal spiral center axis 4c. Desirably, the inside of the spiral pipe 4d is the oil storage part 4a.SELECTED DRAWING: Figure 1

Description

The present invention relates to a supercharged engine, and more particularly to a supercharged engine in which engine oil is less likely to be thermally deteriorated.

Conventionally, there is a supercharger, an engine with a supercharger that includes an oil supply passage that supplies engine oil to the bearing of the supercharger, and an oil discharge passage that discharges engine oil from the bearing of the supercharger (for example, See Patent Document 1).

JP-A-9-151718 (see FIGS. 1 and 2)

<Problem> Engine oil easily deteriorates due to heat.
In Patent Document 1, the engine oil heated to a high temperature by the bearing of the supercharger is discharged without being cooled, and the engine oil is easily thermally deteriorated.

An object of the present invention is to provide an engine with a supercharger in which engine oil is less likely to be thermally deteriorated.

A supercharger (1) illustrated in FIG. 1, an oil supply passage (3) for supplying engine oil (2) to the bearing (1a) of the supercharger (1), and a bearing (1a) of the supercharger (1) ) Is equipped with an oil discharge passage (4) for discharging the engine oil (2),
The oil discharge passage (4) is provided with a discharge side oil cooler (4b) having an oil reservoir (4a),
In the oil storage portion (4a) illustrated in FIG. 2(A), a predetermined amount of engine oil (2) is stored during engine operation, and the engine oil (2) overflowing from the oil storage portion (4a) is discharged to the discharge side oil. An engine with a supercharger, characterized in that it is configured to flow down from the cooler (4b).

<Effect> The engine oil (2) does not easily deteriorate due to heat.
The high temperature engine oil (2) immediately after being discharged from the bearing (1a) of the supercharger (1) illustrated in FIG. 1 is cooled by the discharge-side oil cooler (4b), and the engine oil (illustrated in FIG. 2A) ( There is a large temperature difference between the coolant such as 2) and the engine cooling water (5), and the heat of the engine oil (2) accumulated in the oil reservoir (4a) slowly radiates to the coolant such as the engine cooling water (5). Therefore, the cooling efficiency of the engine oil (2) is high, and the engine oil (2) is less likely to be thermally deteriorated.

1 is a schematic diagram of an engine according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an oil cooler used in the engine of FIG. 1, FIG. 1(A) is a vertical sectional view of a discharge side oil cooler during engine operation, and FIG. 2(B) is a vertical sectional view of a supply side oil cooler during engine stop. It is a figure.

1 and 2 are views for explaining an engine with a supercharger according to an embodiment of the present invention. In this embodiment, a vertical water-cooled in-line multi-cylinder diesel engine with a supercharger will be described.

The outline of the engine in FIG. 1 is as follows.
This engine includes a cylinder block (13), a cylinder head (14) assembled on top of the cylinder block (13), a cylinder head cover (15) assembled on top of the cylinder head (14), and a cylinder block ( 13) an engine cooling fan (6) provided in the front part, a flywheel (17) arranged in the rear part of the cylinder block (13), and an oil pan (18) installed in the lower part of the cylinder block (13). ) Is provided.
With the width direction of the cylinder head (14) as the horizontal direction, an intake manifold (not shown) is attached to one side of the cylinder head (14) and an exhaust manifold (19) is attached to the other side of the cylinder head (14). It is assembled.

The engine of FIG. 1 includes a fuel supply device (12), an engine starting device (20), a water cooling device (21), an engine lubrication device (22), a supercharger (1), and a supercharger lubrication device. (10) is provided.

The fuel supply device (12) of FIG. 1 is a common rail fuel injection device, which includes a fuel injector (24) inserted into a combustion chamber (not shown) and a fuel (12a) supplied to the fuel injector (24). ), a fuel supply pump (27) for supplying fuel (12a) to the common rail (25), and a fuel tank (28) for storing fuel (12a) supplied to the fuel supply pump (27). ) Is provided.
The opening/closing of the solenoid valve (24a) of the fuel injector (24), the internal pressure of the common rail (25), and the rotation speed of the fuel supply pump (27) are controlled by the electronic control unit (11) to control the engine rotation speed and load. Accordingly, the valve opening timing and the valve opening time of the solenoid valve (24a) of the fuel injector (24) are set, and the fuel injector (24) injects a predetermined amount of fuel (12a) at a predetermined timing.
The electronic control unit (11) is an engine ECU. ECU is an abbreviation for electronic control unit and is a microcomputer.

The engine starter (20) of FIG. 1 includes a starter motor (23), a ring gear (30) that meshes with a pinion gear (not shown) of the starter motor (23), a key switch (31), and a battery (32). I have it.
The battery (32) is electrically connected to the starter motor (23) via the key switch (31) and the electronic control unit (11).
The key switch (31) has an OFF position, an ON position and a START position. When the key switch (31) is switched from the OFF position to the ON position, the key switch (31) is switched from the battery (32) to the fuel supply device (12) via the electronic control unit (11). When power is supplied to other electric systems and the ON position is switched to the START position, power is supplied from the battery (32) to the starter motor (23), the engine is started by motoring, and the ON position is switched to the OFF position. The power supply to the fuel supply device (12) and other electric systems is stopped, the electronic control device (11) performs a predetermined process such as storing operation data, and then ends the process.

The water cooling device (21) of FIG. 1 includes a cylinder jacket (13a) that serves as a water passage in the cylinder block (13) for engine cooling water (5) and a cylinder head jacket (14a) that serves as a water passage in the cylinder head (14). A water flange (35) accommodating the thermostat valve (34), a radiator (36), and a water pump (37). The engine cooling water (5) is supplied by the pumping force of the water pump (37). The cylinder jacket (13a), the cylinder head jacket (14a), the water flange (35), the radiator (36), and the water pump (37) are circulated in this order to cool the engine with water. A part of the engine cooling water (5) bypasses the radiator (36) and circulates in the order of the cylinder jacket (13a), the cylinder head jacket (14a) and the water pump (37).
When the temperature of the engine cooling water (5) is low, the thermostat valve (34) is closed, and the engine cooling water (5) only circulates around the radiator (36) to raise the temperature of the engine cooling water (5). Warm-up operation is made to speed up.

1 includes an oil pan (18), an oil pump (38), an oil strainer (39), an oil filter (40), a gallery-side oil cooler (41), and an oil gallery. The engine oil (2) provided with (42) is stored in the oil pan (18) by the pumping force of the oil pump (38), the oil strainer (39), the oil filter (40), and the gallery side oil cooler ( 41), then passes through the oil gallery (42) in this order, and is supplied to the sliding portion (47) such as the bearing portion of the crankshaft.

The supercharger (1) of FIG. 1 is installed on the upper part of the exhaust manifold (19), and is installed between the exhaust turbine (1b), the air compressor (1c), and the exhaust turbine (1b) and the air compressor (1c). The turbine shaft bearing (1a) is provided. The supercharger (1) drives the air compressor (1c) with the exhaust gas (8) flowing into the exhaust turbine (1b) from the exhaust manifold (19), and draws the intake air (9) from the air cleaner (not shown) into the air. The intake manifold is supercharged from the compressor (1c) through the supercharging pipe (33).

The supercharger lubricating device (10) of FIG. 1 includes an oil supply passage (3) branched from the middle of the oil gallery (42) and an oil discharge passage (1a) derived from the bearing (1a) of the supercharger (1). 4), the end of the oil supply passage (3) is communicated with the bearing (1a) of the supercharger (1), and the start end of the oil discharge passage (4) is connected with the bearing (1a) of the supercharger (1). They are communicated with each other, and the terminal end is opened above the oil pan (18).
In the supercharger lubricating device (10), the engine oil (2) cooled by the gallery-side oil cooler (41) and shunted from the oil gallery (42) to the oil supply passage (3) is supplied to the supercharger (1). After cooling the bearing (1a), the oil discharge passage (4) returns to the oil pan (18).

As described above, this engine includes the supercharger (1) shown in FIG. 1, the oil supply passage (3) for supplying the engine oil (2) to the bearing (1a) of the supercharger (1), and the supercharger. An oil discharge passage (4) for discharging engine oil (2) from the bearing (1a) of the machine (1) is provided.
The oil discharge passage (4) is provided with a discharge side oil cooler (4b) having an oil storage portion (4a).
A predetermined amount of engine oil (2) is accumulated in the oil reservoir (4a) of FIG. 2(A) during engine operation, and the engine oil (2) overflowing from the oil reservoir (4a) is discharged to the oil cooler. It is constructed so as to flow down from (4b).

In this engine, the high temperature engine oil (2) immediately after being discharged from the bearing (1a) of the supercharger (1) of FIG. 1 is cooled by the discharge side oil cooler (4b), and the engine of FIG. The temperature difference between the oil (2) and the refrigerant (engine cooling water (5) in this embodiment) is large, and the heat of the engine oil (2) accumulated in the oil storage portion (4a) is slowly released to the refrigerant. Therefore, the cooling efficiency of the engine oil (2) is high, and the engine oil (2) is less likely to be thermally deteriorated.

The discharge-side oil cooler (4b) of FIG. 1 includes a spiral pipe (4d) having an inclined (or horizontal) spiral center axis (4c), and the inside of the spiral pipe (4d) of FIG. It is an oil reservoir (4a).
In this engine, since the engine oil (2) is cooled by the spiral pipe (4d) having a long passage distance of the engine oil (2) in FIG. 1, the cooling efficiency of the engine oil (2) is high.
In addition, in this engine, the oil reservoir (4a) can be formed inside the spiral pipe (4d) simply by inclining or leveling the spiral pipe (4d) in FIG. It is easy to form the storage part (4a).

The discharge side oil cooler (4b) in FIG. 1 is a water-cooled type that uses engine cooling water (5) as a refrigerant.
In this engine, the discharge-side oil cooler (4b) of FIG. 1 is a water-cooled type that is less susceptible to the influence of changes in the outside air temperature than the air-cooled type, so the temperature of the engine oil (2) is stabilized.
Further, in this engine, the engine oil (2) passing through the discharge side oil cooler (4b) of FIG. 1 is water-cooled by the engine cooling water (5), so that a new refrigerant supply dedicated to the discharge side oil cooler (4b) is provided. You don't need a source.
The engine cooling water (5) is supplied from the cylinder jacket (13a) to the discharge side oil cooler (4b) by the suction force of the water pump (37).

The engine cooling water (5) passing through the discharge side oil cooler (4b) of FIG. 2(A) passes through the oil passing direction with the passing direction of the engine oil (2) passing through the discharge side oil cooler (4b) as the oil passing direction. It is configured to be supplied to the discharge side oil cooler (4b) on the downstream side in the direction and discharged from the discharge side oil cooler (4b) on the upstream side in the oil passage direction.
Therefore, the flow of the engine oil (2) and the engine cooling water (5) passing through the discharge side oil cooler (4b) of FIG. Since the difference is large and the amount of heat exchange between them is large, the cooling efficiency of the engine oil (2) is high.

The outer cylinder (4e) of the discharge side oil cooler (4b) of FIG. 1 is made of metal, and the outer peripheral surface thereof is in the air passage (6b) of the engine cooling air (6a) raised by the engine cooling fan (6). It is exposed to the engine cooling air (6a).
Therefore, the heat of the water-cooled exhaust side oil cooler (4b) of FIG. 1 is radiated to the engine cooling air (6a), and the engine cooling water (5) returned from the exhaust side oil cooler (4b) to the engine body (7). The temperature rise of the engine is suppressed, and insufficient cooling of the engine is suppressed.
Further, since the discharge side oil cooler (4b) of FIG. 1 is air-cooled by the engine cooling air (6a), a new refrigerant supply source dedicated to the discharge side oil cooler (4b) is not required.
The engine main body (7) is a main body of the engine excluding engine accessories such as the discharge side oil cooler (4b) and includes the cylinder block (13) and the cylinder head (14).

The oil supply passage (3) of FIG. 1 includes a supply-side oil cooler (3b) having an oil residual holding portion (3a).
The oil residual holding portion (3a) of FIG. 2(B) is configured such that a predetermined amount of engine oil (2) remains after the engine is stopped.
In this engine, during operation of the engine of FIG. 1, the engine oil (2) cooled by the supply oil cooler (3b) is supplied to the bearing (1a) of the supercharger (1), and the engine oil (2) is used. Since the bearing (1a) is cooled to prevent its overheating, the bearing (1a) of the supercharger (1) does not seize.
In addition, the time for the engine oil (2) to fill the supply-side oil cooler (3b) by the amount of the engine oil (2) remaining in the oil residue holding portion (3a) while the engine is stopped in FIG. 2(B). Therefore, the engine oil (2) is supplied to the bearing (1a) of the supercharger (1) at the early stage of the engine start or after the engine start, and the supercharger (1) at the engine start or after the engine start. Bearing (1a) does not seize.

The supply side oil cooler (3b) of FIG. 1 includes a spiral pipe (3d) having an inclined (or horizontal) spiral center axis (3c), and the inside of the spiral pipe (3d) of FIG. It is used as an oil residual holding portion (3a).
In this engine, since the engine oil (2) is cooled by the spiral pipe (3d) having a long passage distance of the engine oil (2) in FIG. 1, the cooling efficiency of the engine oil (2) is high.
In addition, since the oil residual holding portion 3a can be easily formed inside the spiral pipe 3d only by inclining or leveling the spiral pipe 3d, the oil residual holding portion 3a is formed. Is easy.

The oil cooler (3b) on the supply side in FIG. 1 is air-cooled in the air passage (6b) of the engine cooling air (6a) caused by the engine cooling fan (6).
In this engine, the engine oil (2) passing through the supply side oil cooler (3b) of FIG. 1 is air-cooled by the engine cooling air (6a), so a new refrigerant supply source dedicated to the discharge side oil cooler (4b) Does not need

(1)...supercharger, (1a)...bearing, (2)...engine oil, (3)...oil supply passage, (3a)...oil residual holding part, (3b)...supply side oil cooler, (3c) ... spiral center axis, (3d) ... spiral pipe, (4) ... oil discharge passage, (4a) ... oil reservoir, (4b) ... discharge side oil cooler, (4c) ... spiral center axis, (4d) ... spiral Pipe, (4e)... Outer cylinder, (5)... Engine cooling water, (6)... Engine cooling fan, (6a)... Engine cooling air, (6b)... Air passage.

Claims (8)

The supercharger (1), the oil supply passage (3) for supplying the engine oil (2) to the bearing (1a) of the supercharger (1), and the engine oil from the bearing (1a) of the supercharger (1) An oil discharge passage (4) for discharging (2) is provided,
The oil discharge passage (4) is provided with a discharge side oil cooler (4b) having an oil reservoir (4a),
A predetermined amount of engine oil (2) accumulates in the oil storage part (4a) during engine operation, and engine oil (2) overflowing from the oil storage part (4a) flows down from the discharge side oil cooler (4b). The engine with a supercharger, characterized in that In the engine with the supercharger according to claim 1,
The discharge side oil cooler (4b) includes a spiral pipe (4d) having an inclined or horizontal spiral central axis (4c), and the inside of the spiral pipe (4d) is an oil reservoir (4a). Engine with supercharger characterized by. In the engine with a supercharger according to claim 1 or 2,
The engine with a supercharger, characterized in that the oil cooler (4b) on the discharge side is a water-cooled type that uses engine cooling water (5) as a refrigerant. In the engine with a supercharger according to claim 3,
The engine cooling water (5) passing through the discharge side oil cooler (4b) is discharged on the downstream side of the oil passing direction with the passing direction of the engine oil (2) passing through the discharge side oil cooler (4b) as the oil passing direction. An engine with a supercharger, characterized in that it is supplied to the side oil cooler (4b) and is discharged from the discharge side oil cooler (4b) on the upstream side in the oil passage direction. In the engine with a supercharger according to claim 3 or 4,
The outer cylinder (4e) of the discharge-side oil cooler (4b) is made of metal, and the outer peripheral surface of the outer cylinder (4e) is inside the air passage (6b) of the engine cooling air (6a) caused by the engine cooling fan (6). An engine with a supercharger, which is exposed to (6a). In the engine with a supercharger according to any one of claims 1 to 5, the oil supply passage (3) includes a supply-side oil cooler (3b) having an oil residual holding portion (3a),
An engine with a supercharger, characterized in that a predetermined amount of engine oil (2) remains in the oil residual holding portion (3a) after the engine is stopped. In the engine with a supercharger according to claim 6,
The supply-side oil cooler (3b) includes a spiral pipe (3d) having an inclined or horizontal spiral central axis (3c), and the inside of the spiral pipe (3d) serves as an oil residual holding portion (3a). An engine with a supercharger characterized in that. In the engine with a supercharger according to claim 6 or 7,
The engine with a supercharger, wherein the oil cooler on the supply side (3b) is air-cooled in the air passage (6b) of the engine cooling air (6a) caused by the engine cooling fan (6).

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