JP2023074372A - Internal combustion engine and internal combustion system - Google Patents

Abstract

To provide an internal combustion engine and an internal combustion system enabling reduction of the size of the entire internal combustion system including the internal combustion engine, a cooling device and piping for cooling water.SOLUTION: An engine 11 (internal combustion engine) includes: a cooling water inlet 38 (first opening part) communicating with a water pump 20 for circulating cooling water in the engine 11; and an intake port 59 (second opening part) communicating with an intake manifold 57 for supplying air to a cylinder 14 of the engine 11. The cooling water inlet 38 is formed on the same side in the cylinder block 12 as the intake port 59, and the cooling water inlet 38 is formed on the upper side of the position of a crank shaft 13.SELECTED DRAWING: Figure 3

Description

The present invention relates to an internal combustion engine and an internal combustion system equipped with a water pump for circulating cooling water.

An internal combustion engine applied to a vehicle such as an automobile includes a water pump that circulates cooling water for cooling the internal combustion engine.

For example, Patent Document 1 discloses a water pump that transmits the rotational force of a crankshaft to a pulley via a belt and rotates an impeller fixed to a main shaft provided on the pulley to circulate cooling water. is disclosed.

JP 2020-153263 A

However, in the internal combustion engine cooling device disclosed in Patent Document 1, the water pump has to be installed on the front side of the engine because it is driven by the rotational force of the crankshaft. Therefore, a long pipe is required to return the cooling water from the radiator to the water pump, which has been a factor in hindering the downsizing of the internal combustion engine as a whole, including the cooling device and the cooling water pipe.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an internal combustion engine and an internal combustion system capable of reducing the overall size of the internal combustion system including a cooling device and cooling water piping.

To achieve the above object, an internal combustion engine according to the present invention includes a first opening communicating with a water pump that circulates cooling water in the internal combustion engine, and an intake manifold that supplies air to a combustion chamber provided in the internal combustion engine. a second opening in communication with the crankshaft, the first opening being formed on the same side of the cylinder block as the second opening, and the first opening being in communication with the crankshaft is formed above the position of

According to this configuration, the overall size of the internal combustion system including the cooling device and cooling water piping can be reduced.

Further, in the internal combustion engine according to the present invention, the first opening is formed in the side wall along the extending direction of the crankshaft provided in the internal combustion engine.

With this configuration, the return pipe from the radiator to the water pump can be shortened. As a result, the overall size of the internal combustion system including the cooling device and cooling water piping can be reduced. Also, the water pump is less susceptible to engine vibrations than when the water pump is installed behind the engine.

Moreover, in the internal combustion engine according to the present invention, the water pump is an electric water pump.

With this configuration, it is possible to improve the degree of freedom of the installation position of the water pump on the engine. This allows the water pump to be easily installed on the side wall of the cylinder block.

Further, an internal combustion system according to the present invention communicates with an internal combustion engine, a water pump provided in the internal combustion engine for circulating cooling water in the internal combustion engine, and an intake manifold for supplying air to a combustion chamber provided in the internal combustion engine. and a surge tank, and the water pump is installed in a space between the surge tank and a cylinder block of the internal combustion engine.

According to this configuration, the overall size of the internal combustion system including the cooling device and cooling water piping can be reduced.

According to the present invention, it is possible to provide an internal combustion engine and an internal combustion system capable of reducing the overall size of the internal combustion system including the internal combustion engine, cooling device, and cooling water piping.

FIG. 1 is a block diagram showing a schematic configuration of an internal combustion system according to an embodiment. FIG. 2 is a cross-sectional view showing a schematic structure of the water pump. FIG. 3 is a first diagram for explaining the mounting structure of the water pump. FIG. 4 is a second diagram illustrating the mounting structure of the water pump. FIG. 5 is a block diagram showing a schematic configuration of an internal combustion system as a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An internal combustion system 10 according to an embodiment of the present invention will be described using FIG. FIG. 1 is a block diagram showing a schematic configuration of an internal combustion system according to an embodiment.

(Schematic configuration of internal combustion system)
The internal combustion system 10 includes an engine 11 , a water pump 20 that introduces cooling water into the engine 11 , and a radiator 40 as a cooling device that cools the cooling water heated by cooling the engine 11 . Note that the engine 11 is an example of an internal combustion engine in the present disclosure.

Note that in FIG. 1, the engine 11 is an in-line three-cylinder engine in which three cylinders 14 are arranged in series along a crankshaft 13 . It is assumed that the engine 11 is placed horizontally with respect to the longitudinal direction of the vehicle (the X-axis direction in FIG. 1), that is, along the Y-axis direction in FIG. The side from which the rotational output of the crankshaft 13 of the engine 11 is extracted, that is, the rear side of the engine 11 is the Y-axis positive side, and the front side of the engine 11 is the Y-axis negative side.

The cooling water circulating in the internal combustion system 10 also cools auxiliary equipment other than the engine 11 . For example, the EGR cooler 42 and the EGR valve 44 shown in FIG. 1 are cooled. The EGR cooler 42 and the EGR valve 44 are auxiliary devices used for an EGR (exhaust gas recirculation system) that improves fuel efficiency by returning the exhaust gas from the engine 11 to the intake port. In the case of a diesel engine, EGR can reduce the amount of nitrogen oxides (NOx) contained in the exhaust gas. The EGR cooler 42 lowers the temperature of the exhaust gas by circulating cooling water. EGR valve 44 regulates the amount of exhaust gas that is returned to the intake port.

Although not shown in FIG. 1, the cooling water also cools CVT oil used for cooling a CVT (Continuously Variable Transmission), for example.

Furthermore, the cooling water circulating in the internal combustion system passes through a heater 46, which heats the passenger compartment with the heat of the warmed cooling water.

The cooling water that circulates in the internal combustion system 10 circulates through pipes connecting the water pump 20, the engine 11, the radiator 40, and the above-described accessories. This pipe may be arranged inside the engine 11, that is, as an internal pipe, or a metal pipe or the like may be arranged outside the engine 11, that is, as an external pipe.

Although not shown in FIG. 1, the cooling water piping includes a thermostat or the like that changes the circulation path of the cooling water so that the cooling water is not circulated to the radiator 40 or the like when the temperature of the cooling water is low. is installed.

The water pump 20 is installed on the side wall of the cylinder block 12 of the engine 11 . The water pump 20 is an electric water pump and includes a motor section 22 and a pump section 24 .

The motor unit 22 is, for example, a DC motor, and is rotationally driven by a controller (not shown in FIG. 1).

The pump section 24 has an impeller pivotally supported on the rotating shaft of the DC motor. The impeller has a plurality of blades and rotates together with the rotation of the rotary shaft of the DC motor. A plurality of blades of the impeller send the cooling water that has flowed into the pump section 24 into the engine 11 by rotating. The detailed structure of the water pump 20 will be described later (see FIG. 2).

The cooling water flows from the water inlet 16 of the water pump 20 into the pump portion 24 of the water pump 20 and then into the engine 11 .

The cooling water that has flowed into the engine 11 (cylinder block 12 ) flows through cooling water passages formed inside the cylinder block 12 . A cooling water passage inside the cylinder block 12 cools the cylinders 14 (three cylinders in the example of FIG. 1) provided in the engine 11 and discharges from the water outlet 18 .

Next, FIG. 5 is used to compare the internal combustion system 10 with the internal combustion system 10a of the comparative example. FIG. 5 is a block diagram showing a schematic configuration of an internal combustion system as a comparative example.

The internal combustion system 10 a has a water pump 21 in front of the engine 11 . Other configurations are the same as those of the internal combustion system 10 .

Water pump 21 is a mechanical water pump. The water pump 21 has a bearing portion 23 and a pump portion 24 . The bearing portion 23 is rotationally driven by a belt 17 stretched over a crank pulley 15 that rotates with the rotation of the crankshaft 13 . The pump portion 24 has an impeller that rotates together with the bearing portion 23 . The impeller has a plurality of blades and rotates together with the rotation of the bearing portion 23 . A plurality of blades of the impeller send the cooling water that has flowed into the pump section 24 into the engine 11 by rotating.

As shown in FIG. 5, in the internal combustion system 10a of the comparative example, the cooling water piping is arranged in front of the engine 11 from the radiator 40 arranged in the rear of the engine 11, compared to the internal combustion system 10 of the present embodiment. It is necessary to extend to the water pump 21 that is installed.

Therefore, the overall size of the internal combustion system 10 is compact compared to the overall size of the internal combustion system 10a. Further, since the internal combustion system 10 has a shorter cooling water pipe than the internal combustion system 10a, the amount of cooling water to be used can be reduced. Since the piping is short, the internal combustion system 10 has a smaller pressure loss due to the piping than the internal combustion system 10a. As a result, the power (discharge amount) of the water pump 20 used in the internal combustion system 10 can be smaller than that of the water pump 21 . As described above, the internal combustion system 10 improves the cooling performance of the cooling water compared to the internal combustion system 10a.

Further, in the internal combustion system 10, since the water pump 20 is installed on the side wall of the cylinder block 12 of the engine 11, the amplitude when the vibration of the engine 11 is transmitted can be reduced. Therefore, compared to the internal combustion system 10a in which the water pump 21 is installed in front of the engine 11, the water pump 20 can be made thinner and lighter.

(Structure of electric water pump)
The structure of the water pump 20 will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a schematic structure of the water pump.

The water pump 20 has a motor portion 22 and a pump portion 24 .

The motor unit 22 has a rotor 26 (rotor) and a stator 27 (stator) that constitute a motor. The rotor 26 is made of, for example, permanent magnets. Stator 27 is a coil installed inside housing 25 that accommodates rotor 26 . The stator 27 generates a rotating magnetic field when energized. Rotor 26 is rotated about pump shaft 28 by the rotating magnetic field generated by stator 27 .

The pump section 24 has an impeller 29 and a pump cover 30 .

Impeller 29 is an impeller having a plurality of blades. The impeller 29 is integrally formed with the rotor 26, is supported by the pump shaft 28 by bearings (not shown), etc., and rotates around the pump shaft 28 to function as a centrifugal pump. A spiral vortex chamber is formed inside the pump cover 30 that houses the impeller 29 . The cooling water flowing from the pipe 32 is turned 90° by the centrifugal force generated by the rotation of the impeller 29 and discharged to the pipe 34 . After that, the cooling water discharged to the pipe 34 flows into the engine 11 .

In addition, in FIG. 2, the pump cover 30 and the housing 25 are integrally formed of, for example, a resin material.

Also, the structure of the electric water pump is not limited to that shown in FIG. For example, the pump cover 30 and the housing 25 may be separate types.

(Mounting structure of electric water pump)
The mounting structure of the water pump 20 will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a first diagram for explaining the mounting structure of the water pump. FIG. 4 is a second diagram illustrating the mounting structure of the water pump.

FIG. 3 is an XZ cross-sectional view of the in-line three-cylinder engine 11, taken approximately at the center of the third cylinder counted from the front side.

Engine 11 is mainly formed of cylinder block 12 , cylinder head 19 and oil pan 51 . Each cylinder is provided with a piston 52 that slides up and down along the inner wall of the cylinder. Vertical movement of the piston 52 is transmitted to the crankshaft 13 via the connecting rod 53 . As a result, the crankshaft 13 rotates. The rotational movement force of the crankshaft 13 provides propulsion of the vehicle.

A combustion chamber 61 is formed above the piston 52 . An intake valve 55 , an exhaust valve 56 and an ignition plug 62 are provided above the combustion chamber 61 . The intake valve 55 moves up and down at a predetermined timing to allow the intake port 59 and the combustion chamber 61 to communicate with each other. The exhaust valve 56 moves up and down at a predetermined timing to allow communication between the exhaust port 60 and the combustion chamber 61 .

Air flows into the combustion chamber 61 from the intake port 59 . Fuel such as gasoline is injected into the inflowing air at the intake port 59 or the combustion chamber 61 to generate an air-fuel mixture. The ignition plug 62 ignites the air-fuel mixture in a state in which the piston 52 rises and the air-fuel mixture in the combustion chamber 61 is compressed. The air-fuel mixture explodes upon ignition and pushes the piston 52 downward. This push-down force is transmitted to the crankshaft 13 via the connecting rod 53 to generate rotational force of the crankshaft 13 .

After that, the piston 52 rises again to exhaust the combustion gas inside the combustion chamber 61 through the exhaust port 60 .

The water pump 20 is attached to the side wall of the cylinder block 12 on the side of the intake port 59 among the side walls along the extension direction of the crankshaft 13 of the engine 11 . That is, the cooling water inlet 38 communicating with the water pump 20 is formed on the same side of the cylinder block 12 as the intake port 59, and the cooling water inlet 38 is formed above the position of the crankshaft 13. be. The details of the mounting structure of the water pump 20 will be described later (see FIG. 4).

The intake manifold 57 communicating with the intake port 59 also communicates with the surge tank 58 . The surge tank 58 temporarily stores air taken in from an air intake (not shown) so that the air can be evenly taken into each cylinder. Water pump 20 is installed in a space between surge tank 58 and cylinder block 12 .

The cooling water that has flowed in from the pipe 32 is turned to the direction of the pipe 34 by the action of the water pump 20 and flows into the cylinder block 12 from the cooling water inlet 38 . A water jacket 50 is formed inside the cylinder block 12 and inside the cylinder head 19, and cooling water flowing from the cooling water inlet 38 travels through the water jacket 50 to cool each part of the engine 11. do.

The side wall of the cylinder block 12 on the side of the exhaust port 60 also has a space where the water pump 20 can be installed. However, it is desirable not to install the water pump 20 on the side wall of the cylinder block 12 on the side of the exhaust port 60 because the cooling water is warmed by the high-temperature exhaust gas flowing through the exhaust port 60 .

Next, a structure for attaching the water pump 20 to the cylinder block 12 will be described with reference to FIG.

A flange 35 is formed at the tip of the pipe 34 of the water pump 20 . A flange 35 is formed in a flat plate shape at the tip of the pipe 34 . Through-holes 35a and 35b are opened at positions sandwiching the pipe 34 of the flange 35 .

A flange 36 is formed on the side surface of the housing 25 of the water pump 20 . The flange 36 is formed substantially parallel to the flange 35 on the opposite side of the flange 35 with the housing 25 interposed therebetween. A through hole 36 a is formed in the flange 36 .

Male-threaded bolts 37 are inserted through the through-holes 35a, 35b and the through-hole 36a, respectively. Each bolt 37 inserted through the through holes 35a, 35b and the through hole 36a is coupled with a female screw formed in a bolt hole (not shown) formed in the side wall of the cylinder block 12. As shown in FIG. The water pump 20 is thereby attached to the side wall of the cylinder block 12 . A gasket (not shown) is installed on the rear surface of the flange 35 to prevent leakage of cooling water.

In this manner, the water pump 20 is fastened to the cylinder block 12 at three points surrounding the heavy motor portion 22 (see FIG. 2) contained in the housing 25 . It is desirable to fasten the water pump 20 to the cylinder block 12 at three points surrounding the center of gravity of the water pump 20 . As a result, even if vibration is transmitted from the cylinder block 12 , the water pump 20 is firmly fixed to the cylinder block 12 .

The structure for attaching the water pump 20 to the cylinder block 12 is not limited to the example shown in FIG.

(Action and effect of the present embodiment)
As described above, the engine 11 (internal combustion engine) according to the present embodiment includes the cooling water inlet 38 (first opening) communicating with the water pump 20 that circulates cooling water in the engine 11, the engine 11 and an intake port 59 (second opening) that communicates with an intake manifold 57 that supplies air to the combustion chamber 61 provided by is formed, and the cooling water inlet 38 is formed above the position of the crankshaft 13 . Therefore, the overall size of the internal combustion system 10 including the cooling device and cooling water piping can be reduced.

Further, in the engine 11 (internal combustion engine) according to the present embodiment, the cooling water inlet 38 (first opening) is formed in the side wall along the extension direction of the crankshaft 13 provided in the engine 11 . Therefore, the return pipe from the radiator 40 to the water pump 20 can be shortened. As a result, the overall size of the internal combustion system 10 including the radiator 40 (cooling device) and cooling water piping can be reduced. Moreover, compared to the case where the water pump 20 is installed behind the engine 11 , the water pump 20 is less susceptible to vibrations of the engine 11 .

Further, in engine 11 (internal combustion engine) according to the present embodiment, water pump 20 is an electric water pump. Therefore, the degree of freedom of the installation position of the water pump 20 on the engine 11 can be improved. This makes it possible to easily install the water pump 20 on the side wall of the cylinder block 12 .

Further, the internal combustion system 10 according to the present embodiment includes an engine 11 (internal combustion engine), a water pump 20 provided in the engine 11 for circulating cooling water in the engine 11, and a combustion chamber 61 provided in the engine 11 with air. The water pump 20 is installed in the space between the surge tank 58 and the cylinder block 12 of the engine 11 . Therefore, the overall size of the internal combustion system 10 including the radiator 40 (cooling device) and the cooling water piping can be reduced.

Although the embodiments of the present invention have been described above, the above-described embodiments are presented as examples and are not intended to limit the scope of the present invention. This novel embodiment can be implemented in various other forms. Also, various omissions, replacements, and changes can be made without departing from the scope of the invention. Moreover, this embodiment is included in the scope and gist of the invention, and is included in the scope of the invention described in the claims and its equivalents.

10, 10a internal combustion system 11 engine (internal combustion engine)
12 Cylinder block 13 Crankshaft 14 Cylinder 15 Crank pulley 16 Water inlet 17 Belt 18 Water outlet 19 Cylinder head 20, 21 Water pump 22 Motor section 23 Bearing section 24 Pump section 25 Housing 26 Rotor 27 Stator 28 Pump shaft 29 Impeller 30 Pump cover 32, 34 pipes 35, 36 flanges 35a, 35b, 36a through hole 37 bolt 38 cooling water inlet (first opening)
40 radiator (cooling device)
42 EGR cooler 44 EGR valve 46 Heater 50 Water jacket 51 Oil pan 52 Piston 53 Connecting rod 55 Intake valve 56 Exhaust valve 57 Intake manifold 58 Surge tank 59 Intake port (second opening)
60 Exhaust port 61 Combustion chamber 62 Spark plug

Claims (4)

a first opening in communication with a water pump that circulates cooling water to the internal combustion engine;
a second opening that communicates with an intake manifold that supplies air to a combustion chamber of the internal combustion engine,
The first opening is formed on the same side of the cylinder block as the second opening,
Further, the first opening is formed above the position of the crankshaft,
internal combustion engine. The first opening is
Formed on a side wall along the extension direction of the crankshaft provided in the internal combustion engine,
2. Internal combustion engine according to claim 1. The water pump is an electric water pump,
An internal combustion engine according to claim 1 or claim 2. an internal combustion engine;
a water pump provided in the internal combustion engine for circulating cooling water in the internal combustion engine;
a surge tank communicating with an intake manifold that supplies air to a combustion chamber of the internal combustion engine,
The water pump is installed in a space between the surge tank and a cylinder block of the internal combustion engine,
internal combustion system.

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