JP2002115555A - Structure of passage for supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of passage for a supercharger which can eliminate a complicated structure of piping. SOLUTION: A passage 311 for cooling to guide cooling water to a water jacket of a first supercharger 51 is provided on the inside of a bracket 31, this bracket 31 is provided between an engine block 11 and the first supercharger 51. Cooling water pumped up by a water pump 41A, passing through successively by the order of a grooved part 111B of the engine block 11, the passage 311 For cooling, and a supply water pipe 42 for supercharger, leads to the first supercharger 51. In this way, a number of pipes for guiding the cooling water to the water jacket of the first supercharger 51 can be decreased, additionally a length of the passage 311 for cooling in the supply water pipe 42 for supercharger and the bracket 31 can be minimized so that the piping structure can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharger flow path structure, which cools and / or cools a supercharger of an engine including an engine body including an engine block and the like and a supercharger. The present invention relates to a supercharger flow path structure for lubrication.

[0002]

2. Description of the Related Art Conventionally, it has been known to provide a supercharger in an engine of a vehicle or the like in order to increase the pressure of air to be taken and to send the air to a combustion chamber at a high pressure. As a type of such a supercharger, there are a mechanical drive type in which compression is performed by using a driving force and an exhaust turbine type in which a turbine is rotated and compressed by using exhaust gas. The exhaust turbine type supercharger includes a turbine, a compressor, and a shaft member connecting the turbine and the compressor.The compressor is rotated through the shaft member by rotating the turbine by the exhaust gas, This compressor compresses the intake air. In the mechanically driven supercharger, unlike the exhaust turbine type supercharger, the intake air is compressed by rotating a compressor by rotating a shaft member by a mechanical means such as a motor.

In such a turbocharger, a shaft member and a bearing rotatably supporting the shaft member are lubricated with lubricating oil in order to increase the supercharging efficiency. A lubrication pipe for supplying lubricating oil to necessary parts (shaft members, bearings, etc.) is connected. However, in particular, in the case of an exhaust turbine type turbocharger, as described above, the turbine is driven by the high-temperature exhaust gas discharged from the combustion chamber. It is in the state that was done. Therefore, if the rotation of the turbine stops immediately after the engine stops, the lubricating oil may carbonize. Then, when the engine is restarted, if carbonized lubricating oil is attached to the shaft member and the like,
A load is applied to the shaft member and the like, and the supercharging efficiency is deteriorated, and the lubrication condition is deteriorated, so that the bearing and the shaft are liable to cause abnormal wear. In order to avoid such a problem, a cooling pipe is connected to the supercharger for supplying a cooling liquid to a portion of the supercharger requiring cooling (a water jacket formed on the turbine side of the supercharger). .

[0004]

However, the cooling pipe connected to the above-described supercharger is provided with a portion of the supercharger requiring cooling and, for example, a radiator (coolant cooler) of the engine.
When the radiator is arranged at a position distant from the supercharger, the length of each pipe connecting them increases. Also, the lubrication pipe for supplying lubricating oil to the turbocharger communicates a portion of the turbocharger that requires lubrication with, for example, an oil cooler. Like the cooling pipe, the oil cooler is separated from the turbocharger. If they are arranged at different positions, the pipes connecting them will be long.
Furthermore, since the lubrication pipe and the cooling pipe must be bent so that they do not interfere with other components of the engine, the number of joints of the pipes increases and the piping structure becomes complicated. Problem. In particular, in a large engine, as the number of cylinders increases, the number of superchargers also increases, and the number of lubrication and cooling pipes also increases, so that the piping structure becomes more complicated. In addition, when the number of connecting portions of the pipes increases, a problem such as a leak occurring due to loosening of the connecting portion due to vibration or the like during operation of the engine easily occurs.

An object of the present invention is to provide a flow path structure for a supercharger which can eliminate a complicated piping structure.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a supercharger flow path structure of the present invention has the following arrangement. The invention described in claim 1 is a supercharger flow path structure for cooling and / or lubricating the supercharger of an engine including an engine body and a supercharger,
A cooling flow path provided in the engine body and through which a cooling liquid flows and / or a lubricating oil flow path through which lubricating oil flows; and a cooling flow path that communicates the cooling liquid flow path with a portion of the supercharger that requires cooling. And / or a lubricating flow path that communicates the lubricating oil flow path with a portion of the supercharger that requires lubrication. A bracket is disposed near the supercharger, and the cooling A part of the flow path and / or the lubrication flow path is provided.

In the present invention, both the cooling passage and the lubrication passage may be provided in the bracket, or only one of the cooling passage and the lubrication passage may be provided in the bracket. You may. For example, when the cooling flow path is provided in the bracket, the cooling liquid flowing through the cooling liquid flow path in the engine body is guided to a portion of the supercharger requiring cooling through the cooling flow path in the bracket. Since the cooling flow path is provided in the bracket, the amount of piping for guiding the coolant to the portion of the turbocharger requiring cooling can be reduced by that much, and since the bracket is located near the turbocharger, the piping and the inside of the bracket can be reduced. Can be shortened, whereby the piping structure can be simplified.
On the other hand, when the lubricating flow path is provided in the bracket, the lubricating oil flowing through the lubricating oil flow path in the engine body is guided to the lubrication required portion of the supercharger through the lubricating flow path in the bracket.
Even in such a case, substantially the same effect as when the cooling flow path is provided in the bracket can be obtained. In other words, since the lubrication flow path is provided inside the bracket placed near the turbocharger, it is possible to reduce the number of pipes that guide lubricating oil to the lubrication required portion of the supercharger, and to shorten the pipe and the flow path in the bracket. The piping structure can be simplified. Furthermore, by providing a plurality of flow paths or a bent flow path in the bracket, the number of pipes and the number of joints between the pipes can be reduced, and the piping structure can be further simplified. Since the number of connecting portions between the pipes can be reduced, the probability of occurrence of a problem such as leakage can also be reduced. In addition, the cooling channel and the lubricating channel may return the cooling fluid and the lubricating oil from the cooling required portion and the lubricating required portion of the supercharger to the cooling fluid channel and the lubricating oil channel, respectively. Even in such a case, the above-described effects can be obtained.

According to a second aspect of the present invention, in the supercharger flow path structure according to the first aspect, the engine body includes an engine block having the coolant flow path, and the bracket is The cooling fluid passage and the cooling passage are connected to each other at a portion where the bracket and the engine block are attached to the engine block, and the portion of the supercharger that requires cooling is a bearing. Part. According to the present invention, since the cooling passage of the bracket and the coolant passage of the engine block are connected at the mounting portion between the bracket and the engine block, a pipe is used when connecting the respective passages. There is no need, the length of the piping can be minimized, and the piping structure between the engine body and the supercharger can be made compact. Further, since the coolant is guided to the bearing portion of the supercharger that easily generates high heat, the durability of the bearing of the supercharger can be improved, and deterioration of the lubricating oil due to high temperature can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an engine 1 according to one embodiment of the present invention. The engine 1 includes an engine body 2 and an air supply / exhaust system 3 that supplies and exhausts air to and from the engine body 2. this house,
The supply / exhaust system 3 includes a first supercharger 51 and a second supercharger 52 arranged in series, and these first and second superchargers 5 are provided.
The two-stage supercharging can be performed by the steps 1 and 52. The engine body 2 includes an engine block 11 integrally including an upper block 111 in which combustion chambers (not shown) are arranged in a V-shape and a lower block 112 in which a crankshaft (not shown) is housed. This engine block 1
The cylinder block 12 includes a cylinder head 12 attached to the upper block 111 to form a top wall of the combustion chamber, and a head cover 13 provided on the cylinder head 12. An air supply manifold 60 and an exhaust manifold 70 constituting the air supply / exhaust system 3 are connected to the cylinder head 12, respectively.
Is connected to the compressor side of the first supercharger 51 via the air supply pipe 61, and the exhaust manifold 70 is connected to the turbine inlet 511A of the first supercharger 51.

The engine block 11 is formed to be long in a direction perpendicular to the plane of the drawing.
A plurality of combustion chambers are arranged in a direction perpendicular to the plane of the paper, and an oil pan 2 is provided below the lower block 112 of the engine block 11.
0 is attached. In the upper block 111, the top 11 located between the left and right V-shaped banks 111C.
1A has a groove 11 serving as a coolant flow path opened upward.
1B is formed along the longitudinal direction of the engine block 11 (a direction perpendicular to the plane of FIG. 1), and a bracket 31 having a substantially I-shaped side surface is provided across the groove 111B.

The bracket 31 has a bottom portion 31A provided over the groove portion 111B, and a rising portion 31B provided on the bottom portion 31A. A frame bracket 33 is provided on the rising portion 31B. A second supercharger 52 of the air supply / exhaust system 3 is attached to the frame bracket 33. As shown in FIG. 2, a rectangular plate 32 is arranged in the groove 111 </ b> B in addition to the bracket 31. Although only one bracket 31 and one plate 32 are shown in FIG. 2, a plurality of brackets 31 and plates 32 are actually arranged in the longitudinal direction of the groove 111 </ b> B, and the opening of the groove 111 </ b> B is closed by the bottom 31 </ b> A and the plate 32 of the bracket 31. The inside of the groove 111B is a sealed space.

Returning to FIG. 1, the bottom 31 of the bracket 31
An oil cooler 21 is attached to the lower surface of A, whereby the oil cooler 21 is suspended in the groove 111B. A first oil flow path 22 and a second oil flow path 23 provided in the engine block 11 are connected to a lower portion of the oil cooler 21, respectively, and lubricating oil flows from the first oil flow path 22 to the oil cooler 21. And flows out of the oil cooler 21 from the second oil flow path 23. An end of the first oil passage 22 reaches the inside of the oil pan 20, and a strainer 24 is provided at the end. An oil pump 25 that pumps lubricating oil from the oil pan 20 is provided in the middle of the first oil passage 22.
Is provided. Although not shown, the second oil flow path 23 is connected to a plurality of lubrication-required parts of the engine 1 at the end thereof. Here, the lubrication required portions include, for example, the first and second superchargers 5 of the supply / exhaust system 3.
1, 52, a crankshaft, a camshaft, a timing gear, a piston, and the like (not shown).

A water supply passage 41 provided in the engine block 11 is connected to the groove 111B. A water pump 41A is provided in the middle of the water supply passage 41, and is not shown by the water pump 41A. Cooling water is supplied from the radiator into the groove 111B. Thus, the oil cooler 21 stored in the groove 111B is cooled. Although not shown, the water pump 41A supplies cooling water not only to the groove 111B but also to other parts of the engine 1 requiring cooling. Here, examples of the part requiring cooling include the first supercharger 51 of the supply / exhaust system 3, a water jacket (not shown) formed on the engine block 11, the cylinder head 12, and the like.

The air supply / exhaust system 3 is configured substantially symmetrically with respect to the longitudinal direction of the engine block 11, and includes an air supply system 3A disposed on both outer sides of each of the V-shaped banks 111C of the engine block 11; An exhaust system 3B is provided inside each bank 111C of the block 11 with the bracket 31 interposed therebetween. In the air supply system 3A, air supply gas (air) introduced from an air cleaner (not shown).
Is led to a suction port 523A on the compressor (blower) side of the second supercharger 52, and a discharge port 523B on the compressor side of the second supercharger 52 is connected to the first supercharger 51 by piping not shown. The compressor-side discharge port 513 of the first supercharger 51 is connected to the compressor-side suction port 513A.
B is connected to an inlet 60A of the air supply manifold 60 via an air supply pipe 61. The cylinder head 12 is connected to each of the plurality of branched discharge ports 60B of the air supply manifold 60, and the supply gas is supplied into the combustion chamber via an air supply valve (not shown) provided in the cylinder head 12. Has become. An aftercooler 62 is provided between the air supply manifold 60 and the air supply pipe 61,
As a result, the air is cooled before the supply gas is supplied into the combustion chamber of the engine block 11.

In the exhaust system 3B, exhaust gas discharged from the combustion chamber of the engine block 11 through an exhaust valve (not shown) of the cylinder head 12 is supplied to the exhaust manifold 7.
It is led to 0. The exhaust manifold 70 has a branched suction port 70A connected to the cylinder head 12, and a discharge port 70B connected to the turbine-side suction port 511A of the first supercharger 51.
It is connected to the. A turbine inlet (not shown) of the second supercharger 52 is connected to a discharge port of the first supercharger 51 on the turbine side, and a discharge port 521B of the second supercharger 52 on the turbine side. Is connected to an exhaust muffler (not shown) at the end.

Referring to FIG. 3, the structure of the first supercharger 51 will be described in detail. Here, the second supercharger 52 is connected to the first supercharger 5.
1 has substantially the same structure as that of FIG. The first turbocharger 51 includes a turbine housing 511 connected to the exhaust manifold 70, and a center housing 512 attached to the turbine housing 511.
And a compressor housing 513 (blower housing 513) attached to the center housing 512.
And A shaft member 515 is rotatably provided in the center housing 512 via a bearing 514, and both ends of the shaft member 515 reach the inside of the turbine housing 511 and the inside of the compressor housing 513, respectively. Turbine housing 51 of shaft member 515
A turbine blade 516 is provided at one end, and a compressor blade 517 is provided at an end on the compressor housing 513 side. In such a configuration, exhaust gas that has entered from an inlet (not shown) of the turbine housing 511 is rotated by the turbine blade 516 and is discharged from the discharge port 511B. When the turbine blade 516 is rotated by the exhaust gas, and the shaft member 515 and the compressor blade 517 are rotated, the supply gas entering from the suction port 513A of the compressor housing 513 is compressed by the compressor blade 517 and discharged from the discharge port 513B. Released.

Here, the flow path structure for lubricating the first supercharger 51 will be described. An upper portion of the center housing 512 is formed with a lubricating channel 512A for guiding the lubricating oil to the bearing 514, and a lower portion is formed with an oil outlet 512B through which the lubricating oil flows. Lubrication channel 51
2A is connected to the oil cooler 21 via a pipe (not shown), and the oil outlet 512B is led to the oil pan 20 via a pipe (not shown).

Next, the flow path structure for cooling the first supercharger 51 will be described. A water jacket 512 </ b> C is formed in a portion of the center housing 512 on the turbine housing 511 side, and this water jacket 51 </ b> C is formed.
2C is formed in an annular shape so as to surround the turbine-side end of the shaft member 515. By supplying cooling water to such a water jacket 512C, the turbine-side bearing 514 and the shaft member of the supercharger 51 are provided. 515 can be cooled. Here, the first supercharger 51 will be described in detail.
The supercharger water supply pipe 42 and the supercharger drainage pipe 43 shown in FIG. The supercharger water supply pipe 42 is connected to the groove 111 </ b> B of the engine block 11 via a cooling passage 311 (FIG. 4) formed inside the bracket 31. Cooling channel 311 of bracket 31
Is bent, and the inflow port 311A is formed in the bottom 31A of the bracket 31 and opens downward to face the groove 111B of the engine block 11. The outlet 311B of the cooling passage 311 is formed at the side end of the rising portion 31B of the bracket 31 and is opened to the side, and the supercharger water supply pipe 42 is connected thereto. Here, the bracket 31 includes the engine block 11 and the first supercharger 5.
1, the length of the cooling passage 311 of the bracket 31 and the length of the supercharger water supply pipe 42 can be minimized. In addition, in FIG.
11B, two supercharger water supply pipes 42 are connected via a joint 44, and these two supercharger water supply pipes 42 are connected to two adjacent first superchargers 51. Each is connected to supply cooling water. On the other hand, the turbocharger drain pipe 4
3 is connected at its tip to, for example, a radiator or the like.

Next, the operation of the present embodiment will be described. First, the flow of air supply and exhaust will be described. The supply gas (air) sucked from the air cleaner (not shown) is
The supercharger 52 passes through the supercharger 52 and the first supercharger 51 in order and is supercharged in two stages, and is cooled by the aftercooler 62. The supply gas cooled by the aftercooler 62 passes through the supply manifold 60 and is sent into the combustion chamber via the cylinder head 12. Exhaust gas discharged from the combustion chamber passes through a first supercharger 51 and a second supercharger 52 in order via a cylinder head 12 and an exhaust manifold 70, and each supercharger 5
The 1,52 turbine blades 516 are turned and discharged from an exhaust muffler (not shown).

Next, the flow of the lubricating oil will be described. The lubricating oil contained in the oil pan 20 is pumped up by the oil pump 25 and cooled by the oil cooler 21 and then sent to a portion of the engine 1 where lubrication is required. Here, the lubrication of the first supercharger 51 will be described in detail. The lubricating oil cooled by the oil cooler 21 is guided to the lubrication flow path 512A of the center housing 512 to lubricate the bearing 514 and the shaft member 515, After this lubrication, it flows out from the outlet 512B of the center housing 512 and
Return to 0.

Next, the flow of the cooling water will be described. The cooling water is sent from a radiator (not shown) to a portion of the engine 1 that requires cooling by a water pump 41A. Here, the portion requiring cooling includes the water jacket of the engine block 11 and the groove 111B (the oil cooler 2).
1), the first and second superchargers 51, 52, etc. Here, the cooling of the first supercharger 51 will be described in detail. The cooling water sent from the radiator to the groove 111B by the water pump 41A cools the oil cooler 21 and then, by the pressure of the water pump 41A, the inside of the bracket 31. Through the cooling flow path 311 and the supercharger water supply pipe 42 to reach the water jacket 512C of the center housing 512 of the first supercharger 51, and cools the first supercharger 51. After this cooling, the cooling water returns to the radiator through the supercharger drain pipe 43.

According to the above-described embodiment, the following effects can be obtained. (1) Since the cooling passage 311 for guiding cooling water to the water jacket 512C of the first supercharger 51 is provided inside the bracket 31, cooling water of the first supercharger 51 can be cooled ( The piping for leading to the water jacket 512C) can be reduced, and the bracket 31 is arranged between the engine block 11 and the first supercharger 51, so that the cooling water in the supercharger water supply pipe 42 and the bracket 31 is provided. Channel 31
1 can be minimized, thereby simplifying the piping structure.

(2) Groove portion 111B of engine block 11
Is closed by the bottom portion 31A of the bracket 31, and at such a mounting portion between the bracket 31 and the engine block 11, the flow inlet 311A of the cooling flow passage 311 of the bracket 31 faces the groove 111B, so that the cooling flow is formed. Road 3
The connection between the engine block 11 and the first supercharger 51 can be made compact because the 11 and the groove 111B are connected. The cooling passage 311 and the groove 111
In the connection with B, since a connecting portion is not required, the number of connecting portions between the flow paths can be reduced, and the probability of occurrence of a problem such as leakage can be reduced.

(3) Since the cooling passage 311 is formed in the bracket 31 supporting the frame bracket 33, it is not necessary to use a new component or the like.

(4) A groove 111B is formed between the V-shaped banks 111C of the engine block 11, and the groove 111B is formed.
Since the oil cooler 21 is stored in B, space can be saved.

It should be noted that the present invention is not limited to the above embodiment, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention. For example,
In the above embodiment, the turbine-side bearings 514 and shaft members 515
However, the part requiring cooling according to the present invention is not limited to this.
May be used as long as the first supercharger 51 needs to be cooled.

In the above embodiment, the bracket 31
Cooling channel 3 for supplying cooling water to first supercharger 51
Although 11 is provided, a cooling channel for discharging cooling water from the first supercharger 51 may be provided. In addition, cooling passage 3
Instead of 11, a lubrication flow path for guiding lubricating oil to the first supercharger 51 or discharging lubricating oil from the first supercharger 51 may be provided in the bracket 31. In such a case, for example, the oil cooler 21 and the supercharger lubrication flow path 512 of the first supercharger 51 are formed by the lubrication flow path in the bracket 31.
A or the oil pan 20 and the first supercharger 51
By communicating with the oil outlet 512 </ b> B, the same effects as the effects (1) to (4) of the above-described embodiment can be obtained. Further, both the cooling passage and the lubrication passage may be provided in the bracket, and such a case is also included in the present invention.

In the above-described embodiment, the coolant is supplied to the first supercharger 51 by the cooling passage 311 provided in the bracket 31, but the coolant is supplied to the second supercharger 52. Alternatively, the coolant may be supplied to both the first and second superchargers 51 and 52, and such a case is also included in the present invention. The same applies to the case where a lubrication flow path is provided in the bracket.

In the above embodiment, the supercharger flow path structure according to the present invention is applied to the exhaust turbine type supercharger, but may be applied to a mechanically driven supercharger.

[0030]

According to the present invention, since the cooling channel and the lubricating channel are provided inside the bracket, the cooling fluid and the lubricating oil are correspondingly supplied to the cooling part and the lubricating part of the turbocharger. And the bracket is arranged between the engine body and the supercharger, so that the piping and the flow path in the bracket can be shortened, which has the effect of simplifying the piping structure. .

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an engine according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part in the embodiment.

FIG. 3 is a sectional view showing a first supercharger in the embodiment.

FIG. 4 is a longitudinal sectional view showing a bracket in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Engine main body 11 Engine block 31 Bracket 51 1st supercharger 111B which is a supercharger Groove part which is a cooling liquid flow path 311 Cooling flow path

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02B 39/14 F02B 39/14 A F02F 7/00 F02F 7/00 NF term (Reference) 3G005 EA16 EA23 EA23 EA26 FA28 FA31 FA55 GB32 GB93 GB94 3G013 AA09 AA13 BB04 BB14 BC25 BD00 BD02 BD08 3G024 AA38 CA01 DA19 DA25

Claims (2)

[Claims] 1. A supercharger flow path structure for cooling and / or lubricating the supercharger of an engine including an engine main body and a supercharger, the supercharger being provided in the engine main body. A cooling liquid flow path through which a cooling liquid flows and / or a lubricating oil flow path through which lubricating oil flows; and a cooling flow path that communicates the cooling liquid flow path with a portion of the supercharger requiring cooling. A lubricating flow path that communicates a lubricating oil flow path with a portion of the supercharger requiring lubrication, wherein a bracket is disposed near the supercharger, and the cooling flow path and / or A supercharger flow path structure, wherein a part of a lubrication flow path is provided. 2. The supercharger passage structure according to claim 1, wherein the engine body includes an engine block having the coolant flow passage, and the bracket is attached to the engine block. The cooling liquid flow path and the cooling flow path are connected at a mounting portion between the bracket and the engine block, and the cooling required portion of the supercharger is a bearing. Flow path structure for turbocharger.