JP2003056355A - Engine with turbocharger for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a turbocharger at an optimum position without interference with any other member. SOLUTION: An oil return hole 27 communicating with an oil pan 26 is formed between bores positioned nearer to a blower installation part of the turbocharger 6 at least than an intermediate position of an engine body 1 along a cylinder bank direction. A turbine shaft 6a is positioned on an upper part from an aperture position of an exhaust port formed on a cylinder head 17. The turbocharger 6 is disposed so that a bearing part 18 arranged between a turbine 14 and the blower is positioned nearer to the blower installation part than the intermediate position of the engine body 1. An oil return path 22 led out from the bearing part 18 is connected to the oil return hole 27 formed nearer to the blower installation part than the intermediate position of the engine body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an automobile engine with a turbocharger.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 2000-4578.
As shown in Japanese Patent Publication No. 0, an intake system is provided on the vehicle front side of an engine main body in which a crankshaft is horizontally mounted in the axial direction, and an exhaust system is provided on the vehicle rear side of the engine main body. In this way, the intake air introduced into the engine body through the intake system is effectively cooled by the running wind, and the exhaust gas purifying catalyst arranged in the exhaust system is heated by the heat of the engine body. In the automobile engine configured in, improve the engine output,
Alternatively, a turbocharger is installed for the purpose of improving fuel economy in the high speed rotation range.

[0003]

In the engine described in the above publication, since the turbocharger is installed in a limited space on the vehicle rear side of the engine body,
There is a problem that the degree of freedom of the layout is significantly limited. That is, on the vehicle rear side of the engine body, there are disposed a drive shaft for transmitting the driving force of the engine to the front wheels, auxiliaries such as a master back, etc., and the turbocharger so as not to interfere with them. Therefore, there is a problem that the degree of freedom is extremely small. Further, when an exhaust gas purifying catalyst for purifying exhaust gas is disposed directly behind the vehicle at a position close to the engine body, the turbocharger is installed so as not to interfere with the exhaust gas purifying catalyst. There is a problem that it is particularly difficult to dispose.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an engine with a turbocharger for an automobile in which the turbocharger can be arranged at an optimum position without interfering with other members. Has an aim.

[0005]

The invention according to claim 1 is
The engine has a crankshaft mounted in the axle direction and an exhaust system disposed on the rear side of the vehicle, and a turbocharger having a turbine and a blower disposed in the crankshaft direction of the engine body. In an engine with a turbocharger for automobiles, an oil return hole communicating with an oil pan is formed between at least a bore located closer to the blower installation portion than an intermediate position in the cylinder column direction of the engine body, and a turbine shaft of the turbocharger is provided. Is positioned above the opening position of the exhaust port formed in the cylinder head, and the bearing portion disposed between the turbine and the blower is positioned closer to the installation portion side of the blower than the intermediate position of the engine body. The turbocharger is installed like this, and the oil derived from the bearing of the turbocharger is A return passage is connected to the oil return hole formed on the side where the blower is installed from the intermediate position of the engine body or in the vicinity of the upper end portion thereof, and exhaust gas purification is performed to the exhaust passage that goes downward from the installation part of the turbine. It is provided with a catalyst.

According to the above construction, by disposing the turbocharger on the upper side of the engine body, a space for installing the exhaust gas purifying catalyst and the engine auxiliary equipment on the vehicle rear side of the engine body is effective. The oil derived from the bearing part of the turbocharger is smoothly guided into the oil pan through the oil return hole formed in the engine body.

According to a second aspect of the present invention, in the engine with a turbocharger for an automobile according to the first aspect, an oil return hole is formed in a cylinder head and a cylinder block of an engine body, and the oil return hole is led out from a bearing portion of the turbocharger. The oil return passage is connected to the oil return hole of the cylinder head or near the upper end portion thereof.

According to the above construction, the oil derived from the bearing portion of the turbocharger is smoothly introduced into the oil return hole, so that the oil is agitated by the valve operating mechanism arranged in the cylinder head cover. This effectively prevents the generation of oil mist caused by the above.

According to a third aspect of the present invention, in the engine with a turbocharger for an automobile according to the first aspect, an oil return hole is formed in the cylinder head and the cylinder block of the engine body, and the oil return hole is led out from the bearing portion of the turbocharger. The oil return passage is connected to the portion of the cylinder head cover located between the bores.

According to the above construction, the oil drawn out from the bearing portion of the turbocharger between the bores of the cylinder head cover is not poured into the valve operating mechanism arranged in the cylinder head cover, and the oil is returned in the oil return hole. Will flow into.

According to a fourth aspect of the present invention, in the engine with a turbocharger for an automobile according to the first aspect, the blower of the turbocharger is arranged closer to the transmission side than the intermediate position in the cylinder column direction of the engine body, and An intake passage located upstream of the blower of the turbocharger is arranged above the transmission.

According to the above construction, the intake passage connected to the blower is arranged on the transmission side, so that the intake passage and the exhaust passage are compactly arranged in a limited space, and the exhaust passages are also provided. Also, an increase in exhaust resistance and intake resistance due to the extreme bending of the intake passage can be effectively prevented.

According to a fifth aspect of the invention, in the engine with a turbocharger for an automobile according to the fourth aspect, an oil return passage derived from an upper end portion of the turbocharger is located at an intermediate position in the cylinder row direction of the engine body. Is also connected to the oil return hole formed between the bores located on the transmission side or near the upper end of the oil return hole.

According to the above construction, by bringing the blower of the turbocharger closer to the transmission side without complicating the piping structure of the oil return passage, the intake passage connected to this blower is further compactly piped. It will be.

[0015]

1 to 4 show an engine room of an automobile in which an automobile turbocharged engine according to an embodiment of the present invention is installed. In this engine room, an engine main body 1 is horizontally mounted so that the crankshaft faces the axial direction, and a transmission 2 is installed at one end (the left end of the engine room) of the engine main body 1. An intake system for guiding intake air into the combustion chamber of the engine body 1 is mainly arranged in the engine room on the vehicle front side of the engine body 1 and guides exhaust gas derived from the combustion chamber. An exhaust system is arranged on the vehicle rear side of the engine body 1.

In the intake system, an air cleaner 4 for purifying intake air introduced from an intake introduction section 3 arranged on the left side of the front of the vehicle body, and a first intake passage 5 connected to the air cleaner 4 are provided. The blower 7 of the turbocharger 6 that pressurizes the supplied intake air, the intercooler 9 that cools the intake air supplied through the second intake passage 8 connected to the blower 7, and the intercooler 9 that cools the intake air A third intake passage 11 for supplying intake air to the surge tank 10,
A branch passage 12 for guiding the intake air derived from the surge tank 10 to an intake port provided in the engine body 1.
And are provided.

The first intake passage 5 of the intake system passes through the upper portion of the transmission 2 and is located on the left side in the engine room, and the intake port of the blower 7 located on the upper rear side of the engine body 1. Piped to connect to. Further, the second intake passage 8 is piped so as to pass through the side portion of the transmission 2 and connect the intake port of the intercooler 9 located on the left side of the front portion of the vehicle body and the discharge port of the blower 7. ing.

The third intake passage 11 is provided in the engine body 1
And the discharge port of the intercooler 9 and the surge tank 10 through the front portion of the transmission 2.
Piped to connect to. Then, the intake air introduced into the blower 7 of the turbocharger 6 from the intake air introduction portion 3 through the air cleaner 4 and the first intake passage 5 is pressurized by the blower 7,
After being introduced into the intercooler 9 from the intake passage 8 and cooled, it is supplied to each intake port of the engine body 1 through the third intake passage 11, the surge tank 10 and the branch passage 12. .

In the exhaust system, an exhaust manifold 13 for guiding the exhaust gas derived from the exhaust port of the engine body 1, and a turbocharger 6 driven by the exhaust gas supplied through the exhaust manifold 13.
Of the turbine 14, an exhaust passage 15 extending downward from the installation portion of the turbine 14, and a direct coupling type exhaust gas purifying catalyst 16 disposed in the exhaust passage 15 at a position close to the turbine 14. ing.

The exhaust manifold 13 is connected to exhaust ports formed on the rear surface of the upper part of the engine body 1, that is, on the wall surface of the cylinder head 17 on the rear side of the vehicle body, and extends to the rear side of the vehicle body. And a vertical portion extending upward from the rear end portion. The turbine 14 of the turbocharger 6 is mounted on the upper end of the exhaust manifold 13 so that the turbine shaft 6a of the turbocharger 6 is located above the opening position of the exhaust port. 6 are provided (see FIG. 5).

The turbocharger 6 has a blower 7 and a turbine 14 arranged in the crankshaft direction of the engine body 1, and a bearing portion 18 arranged between the blower 7 and the turbine 14, The blower 7 is installed on the transmission 2 side, that is, on the left side in the engine room in the embodiment shown in FIGS. 2 and 3, and the turbine 14 is installed on the right side in the engine room.

The turbocharger 6 is disposed above the drive shaft 19 installed on the lower rear side of the engine body 1 when viewed from the crankshaft direction of the engine body 1, and the turbocharger 6 is provided. The exhaust gas purifying catalyst 16 is arranged at a position lower than the drive shaft 19 and higher than the drive shaft 19.

As shown in FIGS. 5 and 6, the bearing portion 18 of the turbocharger 6 is led out from an oil filter 20 arranged on the vehicle front side of the engine body 1 through an oil supply passage 21. While the oil is supplied, the oil led out from the bearing portion 18 is supplied to the cylinder head 17 of the engine body 1 through the return passage 22.
It is supposed to be derived within.

The oil supply passage 21 is piped so as to pass above the installation portion of the transmission 2 and connect the upper end portion of the oil filter 20 and the upper end portion of the bearing portion 18 of the turbocharger 6. . Further, the oil return passage 22 is arranged so as to connect the lower end portion of the bearing portion 18 of the turbocharger 6 and the rear wall surface of the cylinder head 17.

The engine body 1 is installed so as to cover a cylinder block 24 having four cylinder bores 23a to 23d formed along the crankshaft direction, a cylinder head 17 attached to the upper end of the cylinder block 24, and an upper part thereof. Cylinder head cover 25 and cylinder block 24
And an oil pan 26 installed so as to cover the lower end of the. In the cylinder head 17 and the cylinder block 24, an oil return hole 27 for leading out oil supplied to a valve mechanism (not shown) installed above the cylinder bores 23a to 23d into an oil pan 26,
28 is formed so as to communicate vertically.

The oil return holes 27 and 28 are
The oil return hole 27, which is installed on the left and right of the intermediate position CL in the cylinder row direction of the engine body 1 and is located on the left side when viewed from the upper side of the engine room, has an end on the transmission 2 side as shown in FIG. Part, that is, between the cylinder bore 23a provided at the left end of the engine room and the cylinder bore 23b adjacent thereto,
The oil return hole 28 located on the right side when viewed from the upper side of the engine room is formed between the cylinder bore 23d provided at the right end of the engine room and the cylinder bore 23c adjacent to the cylinder bore 23d.

The oil return passage 22 is
The oil return hole 27 arranged on the installation portion side of the transmission 2 with respect to the intermediate position CL of the engine body 1.
By connecting to the upper end of the turbocharger 6
The oil derived from the bearing portion 18 is introduced into the oil return hole 27 and guided into the oil pan 26.

In this embodiment, the oil return hole 29 is also formed at the left end of the cylinder head 17 and the cylinder block 24, that is, the end on the side where the transmission 2 is installed. The oil return hole 29 is particularly effectively used as an oil guide path when the engine body 1 is mounted vertically in the engine room.

7 and 8 show an engine cooling water system. This cooling water system includes a main tank 30 and a sub tank 3 arranged at the front end of the engine room.
1, a radiator 32, a water pump 33 attached to the engine body 1, a thermostat 34 that switches the flow path of the cooling water in accordance with the temperature of the cooling water,
An oil cooler 36 that cools the oil with the cooling water that is derived from the water jacket 35 provided in the engine body 1, a vehicle compartment heater 37 that uses the cooling water that is derived from the water jacket 35 as a heating source,
It is provided with a cooling water discharge passage 38 for guiding the cooling water derived from the vehicle interior heater 37 to the thermostat 34.

Further, the cooling water derived from the oil cooler 36 is supplied to the cooling water system by the turbocharger 6 described above.
A cooling water supply passage 40 to be supplied to a water jacket 39 formed in the bearing portion 18 of the above, a steam separation tank 41 for separating a gas component in the cooling water led out from the water jacket 39 of the bearing portion 18, A first discharge passage 42 for cooling water guided from the steam / water separation tank 41 to the sub-tank 31 and a cooling water for guiding cooling water derived from the steam / water separation tank 41 to the discharge passage 38. And a second discharge passage 43 are provided.

The water jacket 39 and the steam separation tank 41 of the turbocharger 6 are the radiator 32.
Is disposed above the upper end of the sub-tank 31, that is, above the upper end of the sub-tank 31, and is attached to the engine body 1 on the transmission 2 side of the turbocharger 6 when viewed from the upper side of the engine room. The steam / water separation tank 41 has the first discharge passage 42 for the cooling water communicating with the sub-tank 31 of the radiator 32.
And the cooling water discharge passage 38 and the thermostat 34
Second cooling water communicating with the water pump 33 side via the
It is arranged at a branch portion with respect to the discharge passage 43.

In the above structure, when the cooling water has a low temperature,
As shown by the solid arrows in FIGS. 7 and 8, the cooling water derived from the water jacket 35 of the engine body 1 is set by setting the path of the thermostat 34 so that the cooling water bypasses the radiator 32 and circulates. Water is supplied to the thermostat 34 via the drainage passage 44 and the bypass passage 45, and the cooling water derived from the water jacket 39 formed in the bearing portion 18 of the turbocharger 6 is the water-water separation tank 41 and the cooling water. After being supplied to the thermostat 34 via the second discharge passage 43 and the cooling water discharge passage 38, the water pump 33 supplies the thermostat 34 to the water jacket 35 of the engine body 1 for circulation.

Further, when the temperature of the cooling water becomes equal to or higher than a predetermined temperature, the thermostat 3 is provided so that the cooling water is supplied to the radiator 32 as shown by the arrows indicated by broken lines in FIGS. 7 and 8.
By setting the path of No. 4, the cooling water derived from the water jacket 35 of the engine body 1 is supplied to the main tank 30 of the radiator 32 through the discharge passage 44, and the water jacket 39 of the bearing portion 18 is also provided. The cooling water derived from the cooling water is supplied to the sub-tank 31 of the radiator 32 through the steam separation tank 41 and the cooling water first discharge passage 42 and cooled, and then the cooling water is supplied through the cooling water supply passage 46. To be supplied to.

As described above, the oil return hole 27 communicating with the oil pan 26 is provided at least in the engine body 1.
Of the turbocharger 6 from the intermediate position CL in the cylinder row direction of
Is formed between the bores 23a and 23b located on the side where the blower 7 is installed, and the turbine shaft 6a of the turbocharger 6 is formed.
Is located above the opening position of the exhaust port formed in the cylinder head 17, a large space for installing various devices can be formed on the vehicle rear side of the engine body 1, and the exhaust gas purifying catalyst 16 and Master back 4
It is possible to secure the degree of freedom of layout when installing an engine auxiliary machine or the like composed of 7 or the like.

Therefore, by disposing the exhaust system on the vehicle rear side of the engine body 1, the exhaust gas purifying catalyst 16 arranged in this exhaust system is heated by the heat of the engine body 1 to be effectively activated. In addition, the engine output is improved in the automobile engine configured to effectively cool the cooling water supplied to the engine body 1 by the traveling wind by disposing the intake system on the vehicle front side of the engine body 1. Or when the turbocharger 6 is installed for the purpose of improving fuel efficiency in the high-speed rotation region and the exhaust gas purifying catalyst 16 is arranged at a position close to the turbine 14 of the turbocharger 6, these are It is possible to effectively prevent the occurrence of the situation of interfering with the engine auxiliary equipment and the like.

The bearing 18 disposed between the turbine 14 and the blower 7, that is, the turbocharger 6
The center of the engine is the intermediate position CL of the engine body 1 in the cylinder row direction.
The turbocharger 6 is arranged so as to be located closer to the installation portion side of the blower 7, and the oil return passage 22 derived from the bearing portion 18 of the turbocharger 6 is
The exhaust gas purifying catalyst 16 is connected to the oil return hole 27 formed on the installation portion side of the blower 7 with respect to the intermediate position CL of the engine body 1 and in the exhaust passage 15 extending downward from the installation portion of the turbine 14. Because it was arranged,
The oil derived from the bearing portion 18 of the turbocharger 6 can be smoothly guided into the oil pan 26 through the oil return hole 27 formed in the engine body 1, and the oil return passage 22 can be provided. It is possible to dispose the exhaust gas purifying catalyst 16 by effectively utilizing the space provided on the one end side of the engine body 1 while preventing the exhaust gas purifying catalyst 16 from interfering with the exhaust gas purifying catalyst 16.

Further, in the above embodiment, the engine body 1
The oil return hole 27 is formed in the cylinder head 17 and the cylinder block 24 of the turbocharger 6.
Oil return passage 22 derived from the bearing portion 18 of the
The oil return hole 2 of the cylinder head 17
Since it is connected to the upper end of the turbocharger 6, the oil derived from the bearing portion 18 of the turbocharger 6 can be smoothly introduced into the oil return hole 27, and each cylinder bore 23 in the cylinder head cover 25.
It is possible to effectively prevent the generation of oil mist due to the agitation of the oil by the valve mechanism arranged on a to 23d.

Incidentally, instead of the above embodiment in which the oil return passage 22 led out from the bearing portion 18 of the turbocharger 6 is connected to the upper end portion of the oil return hole 27 of the cylinder head 17, the engine main body 1 is replaced. In the vicinity of the upper end of the oil return hole 27 formed in the cylinder head 17 and the cylinder block 24, the oil return passage 22 is connected to a portion of the cylinder head cover 25 located between the bores 23a and 23b. May be. Even in the case of such a configuration, it is possible to prevent the oil derived from the bearing portion 18 of the turbocharger 6 from being poured into the valve operating mechanism provided on each of the cylinder bores 23a to 23d in the cylinder head cover 25. At the same time, the oil derived from the return passage 22 can be smoothly introduced into the oil return hole 27 and guided into the oil pan 26.

As shown in the above embodiment, the blower 7 of the turbocharger 6 is arranged closer to the transmission 2 than the intermediate position CL of the engine body 1 in the cylinder column direction, and the blower 7 of the turbocharger 6 is arranged. The first intake passage 5 located upstream is connected to the transmission 2
In the case where the first intake passage 5 is arranged in the upper portion of the transmission 2, the space formed in the upper portion of the transmission 2 can be effectively used to pipe the first intake passage 5 in a compact manner, and Since the exhaust passage 15 extending downward from the installation portion of 14 can be compactly arranged in the rear portion of the engine body 1, the exhaust resistance resulting from the extreme bending of the first intake passage 5 and the exhaust passage 15 is provided. Further, it is possible to effectively prevent an increase in intake resistance, and it is possible to prevent the first intake passage 5 from being an obstacle when the cylinder head cover 25 is removed from the cylinder head 17.

Further, as shown in the above embodiment, the return passage 22 for the oil led out from the lower end portion of the turbocharger 6 is located at the bore closer to the transmission 2 than the intermediate position CL of the engine body 1 in the cylinder row direction. 23
When connected to the oil return hole 27 formed between a and 23b or in the vicinity of the upper end portion thereof, the piping structure of the oil return passage 22 becomes complicated, or the exhaust passage 15 connected to the turbine 14 of the turbocharger 6 is connected. The oil derived from the return passage 22 can be smoothly flowed into the oil return hole 27 without causing a problem such as interference of the oil return passage 22 with the blower 7 of the turbocharger 6. By bringing the first intake passage 5 connected to the blower 7 closer to the transmission 2 side,
It can be further compactly piped.

In particular, as shown in the above embodiment, the oil return holes 27 and 28 are formed on the left and right sides of the engine body 1 with the intermediate position CL interposed therebetween, and the oil return holes 27 are formed near the upper end of the oil return hole 27. The return passage 22 of the cylinder head cover 25
When it is configured to be connected to a portion located between the bores 23a, 23b of the oil, the oil overflowing from the oil return hole 27 during turning of the vehicle or the like is passed through the oil return hole 28 to the oil pan 26. Since it can be guided inside, there is an advantage that the oil drainage can be effectively secured.

Further, in the above embodiment, the turbocharger 6 is arranged above the opening of the exhaust port formed in the engine body 1, and the water jacket 39 provided in the turbocharger 6 is arranged in the radiator 32. Is provided above the upper end of the turbocharger 6, and the steam / water separation tank 41 is provided in the cooling water discharge passages 42, 43 led out from the water jacket 39 of the turbocharger 6. Since the upper end of 41 is located above the upper end of the radiator 32,
The turbocharger 6, the water / water separation tank 41, and the master bag 4 are installed in a limited space in the engine room.
Auxiliary machines such as 7 can be effectively arranged, and the gas component can be effectively separated from the cooling water circulating through the steam / water separation tank 41.

In particular, as shown in the above embodiment, the steam / water separation tank 41 is provided with a first discharge passage 42 for cooling water communicating with the radiator 32 side and a second discharge passage for cooling water communicating with the water pump 33 side. If the cooling water is supplied to the radiator 32 side, or if the cooling water is circulated by bypassing the radiator 32, the steam-water separation tank 41
There is an advantage that the gas component can be separated from the cooling water circulating through the. In addition, the cooling water first discharge passage 42 that communicates the steam separation tank 41 with the radiator 32 side and the second cooling water discharge passage 4 that communicates with the water pump 33 side.
The same effect can be obtained even when it is arranged in the upstream part of the branch part with 3.

In the above embodiment, the water / water separation tank 41 is attached to the engine body 1 at a position offset from the turbocharger 6 to the transmission 2 side as viewed from the upper side of the engine room. Since the cooling water passage communicating with 41, that is, the cooling water supply passage 40 and the like are arranged in the upper space on the transmission 2 side, the cooling water passage is utilized by utilizing the space formed in the upper portion of the transmission 2. And the cylinder head cover 25 can be easily attached and detached by preventing the cooling water passage from interfering with the removal of the cylinder head cover 25 from the cylinder head 17. .

Further, as shown in the above embodiment, the turbocharger 6 is arranged above the drive shaft 19 as viewed from the crankshaft direction of the engine body 1, and the turbocharger 6 is lower than the turbocharger 6 and the drive is lower than the turbocharger 6. Exhaust gas purification catalyst 1 at a position higher than the shaft 19
In the case where 6 is arranged, the exhaust gas purifying catalyst 16 is located at a position close to the engine body 1 on the vehicle rear side of the engine body 1 without impairing the degree of freedom in laying out the exhaust gas purifying catalyst 16. Has an advantage that the emission performance can be improved.

[0046]

As described above, according to the present invention, the crankshaft is mounted in the direction of the axle, and the exhaust system is arranged on the rear side of the vehicle, and the turbine and the blower are the engine main body. In a turbocharged engine for an automobile equipped with a turbocharger arranged in the crankshaft direction, an oil return hole communicating with an oil pan is provided on the side where the blower is installed from an intermediate position in the cylinder row direction of the engine body. Is formed between the bores located in the engine, the turbine shaft of the turbocharger is located above the opening position of the exhaust port formed in the cylinder head, and the bearing portion disposed between the turbine and the blower is installed in the engine body. Install the turbocharger so that it is located closer to the installation side of the blower than the intermediate position of A return passage for the oil derived from the bearing portion of the engine is connected to the oil return hole formed on the blower installation portion side from the intermediate position of the engine main body or in the vicinity of the upper end portion thereof, and the turbine installation portion is connected. Since the exhaust gas purifying catalyst is disposed in the exhaust passage extending downward from the engine, by disposing the turbocharger on the upper side of the engine body, the exhaust gas purifying catalyst and the engine auxiliary equipment are provided on the vehicle rear side of the engine body. The space for installation can be effectively secured, and the oil derived from the bearing part of the turbocharger is smoothly guided into the oil pan through the oil return hole formed in the engine body. There is an advantage that you can.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an automobile engine with a turbocharger according to the present invention.

FIG. 2 is a plan view showing an embodiment of an automobile turbocharged engine.

FIG. 3 is a plan view showing a piping structure of an intake system and an exhaust system.

FIG. 4 is a side view showing a piping structure of an intake system and an exhaust system.

FIG. 5 is a side sectional view showing an oil piping structure for a turbocharger.

FIG. 6 is a plan sectional view showing an oil piping structure for a turbocharger.

FIG. 7 is a plan view showing a piping structure of cooling water.

FIG. 8 is a side view showing a piping structure of cooling water.

[Explanation of symbols]

1 engine body 2 transmission 5 Intake passage (first intake passage) 6 turbocharger 6a turbine shaft 7 Blower 15 Exhaust passage 16 Exhaust gas purification catalyst 17 cylinder head 18 Bearing part of turbocharger 22 Oil return passage 23a-23d cylinder bore 24 cylinder block 25 cylinder head cover 26 oil pan 27 Oil return hole

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02B 37/00 F02F 1/24 G F02F 1/24 F02B 37/00 301H (72) Inventor Akinori Aoki Hiroshima Prefecture 3-1, Fuchu-cho, Aki-gun Shinchi F-term in Mazda Co., Ltd. (reference) 3G005 DA00 EA04 EA16 FA54 GB15 GB17 GB24 GB26 GB39 GB40 GB95 HA13 HA18 3G013 AA07 AA13 BD12 BD47 3G024 AA01 AA21 BA23 DA18 DA25 3G091 AA02 AA38 AA28 AB10 AA08 AA08 AA08 AA08 CB09 DB10 EA16 HA01 HB01 HB06

Claims (5)

[Claims] 1. A turbo engine in which a crankshaft is mounted in the axial direction of the vehicle and an exhaust system is arranged on the rear side of the vehicle, and a turbine and a blower are arranged in the crankshaft direction of the engine body. In an automobile turbocharged engine equipped with a charger, an oil return hole communicating with an oil pan is formed at least between the bores located on the blower installation portion side of an intermediate position in the cylinder row direction of the engine body, While positioning the turbine shaft of the turbocharger above the opening position of the exhaust port formed in the cylinder head,
The turbocharger is arranged so that the bearing portion arranged between the turbine and the blower is located closer to the installation portion side of the blower than the intermediate position of the engine body, and the oil derived from the bearing portion of the turbocharger is arranged. The return passage of
The exhaust gas purifying catalyst is connected to the oil return hole formed on the side where the blower is installed with respect to the intermediate position of the engine body or near the upper end of the blower, and the exhaust gas purification catalyst is provided in the exhaust passage extending downward from the installation part of the turbine. An engine with a turbocharger for automobiles characterized by 2. An oil return hole is formed in a cylinder head and a cylinder block of an engine body, and an oil return passage derived from a bearing portion of a turbocharger is connected to the oil return hole of the cylinder head or near the upper end thereof. The turbocharged engine for an automobile according to claim 1, wherein 3. An oil return hole is formed in a cylinder head and a cylinder block of an engine body, and an oil return passage derived from an upper end portion of a turbocharger is connected to a portion located between the bores of the cylinder head cover. The turbocharged engine for an automobile according to claim 1. 4. A turbocharger blower is disposed on the transmission side of an intermediate position in the cylinder row direction of the engine body, and an intake passage located upstream of the turbocharger blower is disposed above the transmission. The turbocharged engine for an automobile according to claim 1, wherein the engine is installed. 5. An oil return hole, which is derived from the upper end of the turbocharger, is formed between the bores located closer to the transmission than the intermediate position in the cylinder column direction of the engine body, or near the upper end thereof. The turbocharged engine for an automobile according to claim 4, wherein the engine is connected to the turbocharger engine.