JP2006161689A - Cooling water passage structure for engine with supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling water passage structure of an engine with a supercharger capable of reducing size and weight. <P>SOLUTION: In the cooling water passage structure of the engine 1 with the supercharger for cooling a bearing part 24 of a turbocharger 20 by circulating cooling water to the turbocharger 20 mounted on the engine, a supply side outlet passage 15a and a return side inlet passage 14a keeping communication of water jackets 15, 14 for cooling a cylinder head to an outer part are formed on the cylinder head 10 of the engine 1, a supply passage reaching a water jacket 25 for cooling the bearing part provided in the turbocharger 20 from the supply side outlet passage 15a via a supply side pipe 27, and a return passage reaching the return side inlet passage 14a of the cylinder head 10 from the water jacket 25 for cooling the bearing part via a return side pipe 28 are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling water passage structure of an engine with a supercharging device for circulating cooling water through a supercharging device attached to the engine to cool a bearing portion of the supercharging device.

  As a cooling water passage structure of a turbocharged engine for circulating cooling water through a turbocharger attached to the engine and cooling the bearing portion of the turbocharger, a water inlet and a water jacket for cooling the bearing portion of the turbocharger, Has been known in the art in which the water jacket and the water outlet are communicated with each other through a pipe (see, for example, Patent Document 1).

In such a cooling passage structure, since the pipe length from the water inlet or water outlet to the water jacket for cooling the bearing portion is inevitably increased, a lot of space is required for the piping or the weight is increased.
Japanese Utility Model Publication No. 2-87932

An object of the present invention is to provide a cooling water passage structure for a supercharger-equipped engine that can be reduced in size and weight.
In order to achieve the above object, according to the present invention, a cooling water passage of an engine with a supercharging device for circulating cooling water through a supercharging device attached to the engine and cooling a bearing portion of the supercharging device. A supply-side outlet passage and a return-side inlet passage are formed in the cylinder head of the engine and communicated with a water jacket for cooling the cylinder head provided in the cylinder head to the outside. To the bearing head cooling water jacket provided in the supercharging device through the supply side pipe, and from the bearing portion cooling water jacket to the cylinder head via the return side pipe. There is provided a cooling water passage structure for a supercharger-equipped engine comprising a return passage leading to the return-side inlet passage.

  In the present invention, a supply-side outlet passage and a return-side inlet passage for communicating a water jacket for cooling the cylinder head to the outside are formed in the cylinder head of the engine to which the supercharging device is attached, and the supply-side outlet is provided via the supply-side pipe The passage and the bearing portion cooling water jacket communicate with each other, and the bearing portion cooling water jacket and the return side inlet passage communicate with each other through the return side pipe.

  In the present invention, the cooling water for cooling the bearing portion of the supercharging device is guided from the water jacket for cooling the cylinder head to the water jacket for cooling the bearing portion, and then returned to the water jacket for cooling the cylinder head.

  In this way, by cooling the bearing portion of the turbocharger using the cooling water flowing in the cylinder head, the supply side pipe and the return pipe provided between the cylinder head cooling jacket and the bearing portion cooling water jacket are returned. The pipe length of the side pipe can be shortened, and the engine with the supercharger can be reduced in size and weight.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an essential part of an engine with a turbocharger according to an embodiment of the present invention, and in particular, a cross-sectional view showing a cylinder head and a turbocharger. FIG. 3A is a plan view of the turbocharger, FIG. 3A is a front view showing a flange fastening surface of the cylinder head in the embodiment of the present invention, and FIG. 3B is a flange in the embodiment of the present invention. It is a front view which shows the cylinder head fastening surface.

  An engine 1 according to an embodiment of the present invention is an internal combustion engine with a turbocharger (exhaust turbine drive supercharger) used for an automobile or the like, and a cylinder cover (not shown) is attached to an upper portion of the cylinder head 10. At the same time, a cylinder block 30 is attached to the lower part of the cylinder head 10, and the turbocharger 20 is connected to the cylinder block 10 so that the exhaust port 12 of the cylinder head 10 communicates with the exhaust turbine 21 via the conduit 21 a. It is attached.

  First, the cylinder head 10 of the turbocharged engine 1 according to this embodiment will be described.

  As shown in FIGS. 1 and 2, the cylinder head 10 is formed so that the intake port 11 communicates with the combustion chamber 32, and a plurality of exhaust ports 12 (see dotted lines in FIG. 2) include the cylinder head. The turbocharger 20 can be directly attached to the cylinder head 10.

  As shown in FIGS. 1 and 2, the cylinder head 10 includes an intake-side water jacket 13 for cooling the intake port 11 side, and an exhaust-side upper water jacket 14 for cooling the upper side of the exhaust port 12. An exhaust side lower water jacket 15 for cooling the lower part of the exhaust port 12 is provided.

  Further, as shown in FIG. 2, the cylinder head 10 includes a cooling water inlet 16 through which cooling water flows into the cylinder head 10 from, for example, a cylinder block 30 by the action of a water pump (not shown), and a cylinder head. A cooling water outlet 17 is formed through which cooling water is discharged from 10 to a radiator or the like via, for example, a water outlet.

Then, in the cylinder head 10, as shown in the figure, the cooling water from the inlet 16 of the water flow I ₁ that has entered the cylinder head 10 cooling water is flowed each of the water jacket 13 to 15 binary, the predetermined portion After cooling, it merges as the water stream I ₇ and is discharged to the outside through the cooling water outlet 17.

Specifically, the cooling water guided from the cooling water inlet 16 to the intake water jacket 13 is discharged from the cooling water outlet 17 after cooling the intake port 11 side as the water flow I ₂ . Further, the cooling water introduced from the cooling water inlet 16 to the exhaust-side upper water jacket 14 is discharged into the exhaust port 12 including the periphery of the spark plug 51, the exhaust valve guide 52, the head bolt 53, and the like as water flows I _{3 to} I _5. After the upper side is cooled, it is discharged from the cooling water outlet 17. Further, the cooling water led from the cooling water inlet 16 to the exhaust side lower water jacket 15 is cooled as the water flow I ₆ below the exhaust port 12 and then discharged from the cooling water outlet 17.

  Furthermore, as shown in FIGS. 1 to 3A, the cylinder head 10 in the present embodiment is formed with a supply-side outlet passage 15a that allows the exhaust-side lower water jacket 15 to communicate with the outside. The supply-side outlet passage 15 a can communicate with a supply-side through hole 26 a formed in the flange 26 when a flange 26 described later is attached to the cylinder head 10.

  An annular groove 15c is formed around the opening of the supply side outlet passage 15a, and an O-ring 15d is inserted into the annular groove 15c. And, when the turbocharger 30 is attached to the cylinder head 10 by the O-ring 15d, it is possible to maintain high sealing performance between the supply side outlet passage 15a and the supply side through hole 26a, and leakage of the cooling water. It is possible to prevent.

  Similarly, in the cylinder head 10 according to the present embodiment, a return-side inlet passage 14a that allows the exhaust-side upper water jacket 14 to communicate with the outside is formed. The return side inlet passage 14 a can communicate with a return side through hole 26 b formed in the flange 26 when the flange 26 is attached to the cylinder head 10.

  An annular groove 14c is formed around the opening of the return side inlet passage 14a, and an O-ring 14d is inserted into the annular groove 14c. The O-ring 14d can maintain high sealing performance between the return side inlet passage 14a and the return side through hole 26b when the turbocharger 20 is attached to the cylinder head 10. It is possible to prevent.

Further, as shown in FIG. 2, a dynamic pressure plate having a curved shape at the opening peripheral edge of the supply-side outlet passage 15 a in the exhaust-side lower water jacket 15 so as to face the coolant flow I ₆ around the opening. 15b is provided. By providing such a dynamic pressure plate 15b, the water flow I6 of the exhaust-side lower water jacket 15 can be used to actively flow the cooling water from the water jacket 15 into the supply-side outlet passage 15a by dynamic pressure. It is possible.

In contrast, in the periphery of the opening of the return-side inlet passage 14a of the exhaust-side upper water jacket 14, the negative plate 14b having a curved shape along the water flow I ₅ of the cooling water in the surrounding the opening is provided . By providing such a negative plate 14b, by utilizing the water flow I ₅ at the exhaust side upper water jacket 14, thereby flowing positively by negative pressure in the cooling water return side inlet passage 14a the water jacket 14 from Is possible.

  Next, the turbocharger 20 of the turbocharged engine 1 according to the present embodiment will be described.

  As shown in FIGS. 1 and 2, the turbocharger 20 includes an exhaust turbine 21, a compressor 22, a shaft 23, a bearing portion 24, a flange 26, a supply side pipe 27, and a return side pipe 28.

  The exhaust turbine 21 has a turbine wheel (not shown) that is rotated by exhaust gas from the engine 1 and communicates with the exhaust port 12 of the cylinder head 10 via a conduit 21a. The compressor 22 has a compressor wheel (not shown) for supercharging air to the engine 1. A bearing portion 24 having a bearing (not shown) or the like holds the shaft 23 rotatably about the rotation axis. A turbine wheel is fixed to one end of the shaft 23, while a compressor wheel is fixed to the other end.

  When the exhaust gas of the engine 1 enters the exhaust turbine 21 via the exhaust port 12 and the conduit 21a, the turbine wheel rotates, and this rotational force is transmitted to the compressor wheel via the shaft 24. Can rotate and supercharge the air.

  Further, a bearing portion cooling water jacket 25 is provided inside the bearing portion 24, and the bearing that rotatably holds the rotating shaft 24 by circulating cooling water through the water jacket 25. Etc. can be cooled.

  One end portion of the supply side pipe 27 is attached to the bearing portion 24 so that the supply side pipe 27 that is a tubular member communicates with a lower portion of the water jacket 25 for cooling the bearing portion.

  The other end of the supply side pipe 27 is attached to the flange 26 so that the supply side pipe 27 communicates with a supply side through hole 26 a formed in the flange 26.

  The supply side through hole 26 a of the flange 26 is formed at a position facing the supply side outlet passage 15 a of the cylinder head 10. When the flange 26 is attached to the cylinder head 10, the supply side through hole 26 a The supply side outlet passage 15a communicates with the supply side outlet passage 15a.

  Therefore, in the present embodiment, the exhaust side lower water jacket 15 of the cylinder head 10 and the bearing portion cooling water jacket 25 of the turbocharger 20 are connected to the supply side outlet passage 15a of the cylinder head 10 and the supply side through hole of the flange 26. 26 a and a supply passage composed of the supply side pipe 27 communicates with each other.

  Similarly, one end of the return side pipe 28 is attached to the bearing portion 24 so that the return side pipe 28 that is a tubular member communicates with the upper portion of the water jacket 25 for cooling the bearing portion.

  The other end of the return side pipe 28 is attached to the flange 26 so that the return side pipe 28 communicates with a return side through hole 26 b formed in the flange 26.

  The return side through hole 26 b of the flange 26 is formed at a position facing the return side inlet passage 14 a of the cylinder head 10. When the flange 26 is attached to the cylinder head 10, the return side through hole 26 b The return side entrance passage 14a communicates with the return side entrance passage 14a.

  Therefore, in this embodiment, the bearing jacket cooling water jacket 25 of the turbocharger 20 and the exhaust-side upper water jacket 14 of the cylinder head 10 include the return side pipe 28, the return side through hole 26b of the flange 26, and the cylinder. The head 10 communicates with a return passage composed of a return side inlet passage 14a.

  In the present embodiment, the pipes 27 and 28 can be fixed to the bearing portion 24 and the flange 26 in advance by the configuration as described above. Therefore, after the turbocharger 20, the pipes 27 and 28, and the flange 26 are once assembled (after subassembly), the turbocharger 20 and the cylinder head 10 can be assembled. It is possible to reduce the number of assembly steps.

  Further, in this embodiment, the supply side through hole 26a and the return side through hole 26b are formed in the flange 26, so that the cooling water flows through the flange 26 itself. It becomes possible to reduce the thermal stress generated in the cylinder head 10.

  An exhaust passage 26c is formed at a substantially opposite center of the flange 26 of the turbocharger 20 at a position facing the exhaust port 12 of the cylinder head 10, and when the flange 26 is attached to the cylinder head 10, the exhaust passage 26c. And the exhaust port 12 communicate with each other. A conduit 21 a communicating with the exhaust turbine 21 is attached to the opposite surface of the exhaust passage 26 c.

  Further, the flange 26 is formed with bolt through holes 26d at four locations as shown in FIG. 3 (B), with respect to the bolt fastening holes 18 formed in the cylinder head 10 shown in FIG. 3 (A). Thus, the turbocharger 20 can be fixed to the cylinder head 10 by inserting and fastening bolts 29 into the respective bolt through holes 26d.

  Next, the operation will be described.

  When the air-fuel mixture supplied via the intake port 11 of the cylinder head 10 is burned in the combustion chamber 32 surrounded by the cylinder 31 and the piston 40, the exhaust gas generated by this combustion is exhausted from the exhaust port 12, and the exhaust gas is exhausted. It is introduced into the exhaust turbine 21 of the turbocharger 20 via the passage 26c and the conduit 21a. Then, the turbine wheel rotates, the compressor wheel of the compressor 22 starts rotating through the shaft 23, and the air supplied to the intake port 11 is supercharged.

During such operation of the engine, cooling water is taken into the cylinder head 10 from the cooling water inlet 16, and cooling water flows I _{2 to} I ₆ are generated in the water jackets 13 to 15. After cooling the site, the cooling water is discharged from the cooling water outlet 17 to the outside as a water flow I ₇ .

At this time, a part of the cooling water ₁₆ flowing through the exhaust-side lower water jacket 15 flows out from the exhaust-side lower water jacket 15 into the supply-side outlet passage 15a, and further, the supply-side through hole 26a of the flange 26 is provided. And flows into the supply side pipe 27 (water flow S _{1 in} FIGS. 1 and 2). Then, the cooling water that has flowed into the supply side pipe 27 travels through the pipe 27, reaches the bearing portion cooling water jacket 25 (water flow S _{2 in} FIG. 1), and flows through the water jacket 25 to become a bearing. The part 24 is cooled.

The cooled cooling water enters the return side pipe 28 from the bearing portion cooling water jacket 25 (water flow R _{1 in} FIG. ₁ ). The cooling water that has entered the return side pipe 28 travels through the pipe 28, reaches the return side through hole 26 b of the flange 26, and further enters the exhaust side upper water jacket 14 via the return side passage 14 a of the cylinder head 10. (Water flow R _{2 in} FIGS. 1 and ₂ ). The cooling water that has flowed into the exhaust-side upper water jacket 14 merges with the water flow I ₅ of the water jacket 14 and is discharged from the cooling water outlet 17 together with other cooling water that has circulated in the cylinder head 10.

Therefore, in the present embodiment, the cooling water that has flowed into the cylinder head 10 from the cooling water inlet 16 flows in the cylinder head 10 as water flows I _{2 to} I ₆ , and in addition to the water flows S ₁ and S ₂ , the turbocharger 20. is supplied to the bearing portion cooling water jacket 25, further the cooling water, as the water flow R ₁ and R _2, is adapted to be returned from the water jacket 25 in the cylinder head 10, flows through the cylinder head 10 It is possible to cool the bearing portion 24 of the turbocharger 20 using cooling water.

  As a result, the pipe lengths of the supply side pipe 27 and the return side pipe 28 provided between the cylinder head cooling jackets 15 and 14 and the bearing portion cooling water jacket 25 can be shortened. 1 can be reduced in size and weight.

  In the present embodiment, the dynamic pressure plate 15b is provided at the opening periphery of the supply side outlet passage 15a, and the negative pressure plate 14b is provided at the opening periphery of the return side inlet passage 14a, whereby the water jacket for cooling the bearing portion of the turbocharger 20 is provided. The pressure difference between the pressure on the supply side to 25 and the pressure on the return side from the water jacket 25 can be increased. Thereby, the cooling water can be circulated stably in the turbocharger 20, and the reliability of the turbocharger 20 can be improved.

  Furthermore, in this embodiment, as shown in FIG. 1, in the cylinder head 10, the return side inlet passage 14a is formed relatively high with respect to the supply side outlet passage 15a. For this reason, even during dead soak (stop immediately after high load operation), it is possible to generate a natural circulation of cooling water between the water jackets 14 and 15 of the cylinder head 10 and the water jacket 25 of the turbocharger 20. The reliability of the charger 20 can be increased.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in this embodiment, a turbocharged engine has been described in which the turbocharger is directly attached to the cylinder head. However, the present invention is not particularly limited to this type, and the exhaust manifold is separated from the engine. May be.

  In the present embodiment, the annular grooves 15c and 14c for inserting the O-rings 15d and 14d are formed around the openings of the supply-side outlet passage 15a and the return-side inlet passage 14a of the cylinder head 10. The present invention is not particularly limited to this, and an annular groove may be formed around the openings of the supply side through hole 26a and the return side through hole 26b of the flange 26.

FIG. 1 is a cross-sectional view of a main part of an engine with a turbocharger according to an embodiment of the present invention, and in particular, a cross-sectional view showing a cylinder head and a turbocharger. FIG. 2 is a view showing a flow of cooling water in the water jacket of the cylinder head in the embodiment of the present invention and a plan view of the turbocharger. FIG. 3A is a front view showing the flange fastening surface of the cylinder head in the embodiment of the present invention, and FIG. 3B is a front view showing the cylinder fastening surface of the flange in the embodiment of the present invention. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine with a turbocharger 10 ... Cylinder head 11 ... Intake port 12 ... Exhaust port 13 ... Intake side water jacket 14 ... Exhaust side upper water jacket 14a ... Return side inlet passage 14b ... Negative pressure plate 14c ... Annular groove 14d ... O-ring 15 ... exhaust side lower water jacket 15a ... supply side outlet passage 15b ... dynamic pressure plate 15c ... annular groove 15d ... O-ring 16 ... cooling water inlet 17 ... cooling water outlet 20 ... turbocharger 21 ... exhaust turbine 22 ... compressor 23 ... shaft 24 ... cooling water in the water jacket of the bearing portion 25 ... bearing portion cooling water jacket 26 ... flange 26a ... supply-side through holes 26b ... return side through hole 27 ... supply-side pipe 28 ... return side pipe _I 1 ~I 6 _... cylinder head water flow _{S 1, S} 2 _... supply communication of Water flow R ₁ of the cooling water passing through the _water flow of the coolant passing through the R 2 _... return passage

Claims (6)

A cooling water passage structure for an engine with a supercharging device for circulating cooling water through a supercharging device attached to the engine to cool a bearing portion of the supercharging device,
A supply-side outlet passage and a return-side inlet passage are formed in the cylinder head of the engine so that a water jacket for cooling the cylinder head provided in the cylinder head communicates with the outside.
A supply passage from the supply-side outlet passage to a water jacket for cooling a bearing portion provided in the supercharging device via a supply-side pipe;
A cooling water passage structure for an engine with a supercharging device, comprising: a return passage extending from the bearing portion cooling water jacket to the return side inlet passage formed in the cylinder head through a return side pipe. A dynamic pressure plate having a shape facing the cooling water flow around the opening is provided on the periphery of the opening of the supply side outlet passage in the water jacket for cooling the cylinder head,
The supercharging device with a supercharging device according to claim 1, wherein a negative pressure plate having a shape along the flow of the cooling water around the opening is provided at an opening peripheral edge of the return side inlet passage in the water jacket for cooling the cylinder head. Engine coolant passage structure. One end of each of the supply side pipe and the return side pipe is fixed to a flange interposed between the cylinder head and the supercharger, and the other end thereof is the supercharger. It is fixed to the bearing part of
The flange includes
A supply-side through-hole communicating the supply-side outlet passage and the supply-side pipe;
The cooling water passage structure for a supercharger-equipped engine according to claim 1 or 2, wherein a return-side through hole that communicates the return-side pipe and the return-side inlet passage is formed.   The cooling water passage structure for an engine with a supercharging device according to claim 3, wherein the return side inlet passage of the cylinder head is formed relatively high with respect to the supply side outlet passage. The supply-side outlet passage communicates with an exhaust-side lower water jacket located below an exhaust port of the cylinder head;
The cooling water passage structure for an engine with a supercharging device according to claim 4, wherein the return side inlet passage communicates with an exhaust upper water jacket located above the exhaust port of the cylinder head. Around the opening of the supply-side outlet passage and the return-side inlet passage on the surface facing the flange of the cylinder head, or the supply-side through-hole and the return-side through-hole on the surface of the flange facing the cylinder head An annular groove is formed around the opening of
The cooling water passage structure for an engine with a supercharging device according to any one of claims 3 to 5, wherein an O-ring is inserted into the annular groove.

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