JP3126460B2 - Rotary turbocharger mounting structure for V-type engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary turbocharger mounting structure for a V-type engine.
The present invention relates to a rotary supercharger mounting structure for mounting a rotary supercharger between left and right banks of a die engine via brackets.

[0002]

2. Description of the Related Art A mechanical supercharger such as a roots-type supercharger is widely used for supercharging an intake air of an engine. This type of rotary supercharger is configured to rotate a compressor by torque of a crankshaft and compress engine intake air in an intake system. In a V-type engine having such a supercharger, there is known a structure in which a rotary supercharger is arranged in a region between the left and right banks in order to effectively utilize the space between the left and right banks. As a mounting structure of such a supercharger, the present applicant not only arranges the supercharger in the inter-bank area to effectively use the inter-bank area, but also attaches the supercharger to the cylinder block via the bracket. A supercharger mounting structure that facilitates mounting, supercharging, and removing has been proposed (Japanese Utility Model Laid-Open No. 1-152030). According to this mounting structure, the bracket includes the base fixed to the cylinder block and the U-shaped support extending left and right from the base. In this bracket, the base is bolted to the area between the banks of the cylinder block, and the mounting arms of the turbocharger are bolted to the bosses provided at the upper right and left ends of the U-shaped support, whereby the cylinder block A supercharger can be held above.

[0003]

In order to lubricate such a supercharger, a lubricating oil circuit constituting a lubrication system of the engine is connected to a lubricating oil passage of the supercharger. Generally, a lubricating oil supply passage of a supercharger is connected to a lubricating oil supply passage of a cylinder block. Further, the lubricating oil return oil passage of the turbocharger penetrates the cylinder block and opens to the crank chamber, and communicates with the oil pan in the crank chamber.

However, in the supercharger having the above-described mounting structure, the lubricating oil passage must be arranged so as to bypass the bracket, and the pipe thus piped substantially increases the installation space of the supercharger. . Further, since the pressure in the crank chamber fluctuates due to blow-by gas or the like flowing through the crank chamber, the fluctuation in the pressure in the crank chamber affects the fluidity or drainage of the lubricating oil discharged from the return oil passage. For example, when the pressure in the crank chamber is increased, the lubricating oil to be discharged from the return oil passage may not be smoothly discharged into the crank chamber, or the lubricating oil may flow backward due to blow-by gas blowing up in the return oil passage.

The present invention has been made in view of such a point, and an object thereof is to simplify a lubricating oil path of a rotary supercharger in a rotary supercharger mounting structure of a V-type engine. It is another object of the present invention to reduce the influence of pressure fluctuations in the crank chamber on a lubricating oil return oil passage of a supercharger, and to solve the problems of the related art such as an increase in a space for installing a supercharger and a decrease in oil drainage.

[0006]

In order to achieve the above object, the present invention provides a rotary supercharger mounting structure for mounting a rotary supercharger between left and right banks of a V-type engine via a bracket. , The bracket has a base portion supported by a cylinder block between left and right banks, and an arm portion extending upward from the base portion and supporting the supercharger, the base portion of the supercharger A lubricating oil return path for communicating the lubricating oil return path with the oil pan of the engine; and a lubricating oil path for communicating the lubricating oil supply oil path of the cylinder block with the lubricating oil supply path of the supercharger. And a rotary supercharger mounting structure for a V-type engine.

[0007] According to the rotary turbocharger mounting structure having the above-described structure, the lubricating oil passage of the supercharger is formed in the bracket, so that it is not necessary to provide a lubricating oil pipe around the supercharger.
Therefore, the lubricating oil path can be simplified and the supercharger installation space can be designed to be compact. According to the present invention, in the rotary supercharger mounting structure, the base includes a bottom surface supported on an upper surface of a cylinder block, and a lubricating oil discharge port of the return oil passage that is opened on the bottom surface. A V-type engine, wherein a space separated from a crankcase is formed in cooperation with an inner wall of each bank, and the cylinder block has a lubricating oil return hole communicating the space with the crankcase. And a rotary supercharger mounting structure. According to this configuration, the lubricating oil lubricating the turbocharger returns to the oil pan in the crank chamber through the space and the lubricating oil return hole, so that the discharge pressure of the lubricating oil discharge port is affected by the pressure fluctuation in the crank chamber. The lubricating oil of the turbocharger is smoothly discharged from the lubricating oil discharge port. Therefore, the lubricating oil drainage of the turbocharger can be improved.

[0008] In an embodiment of the present invention, the lubricating oil recirculation hole is disposed on an engine end wall in an offset region in which one bank is retreated in the crank axis direction. In this configuration, the lubricating oil recirculation holes are arranged in the offset region of the engine end wall, so that the engine offset region can be effectively used. In a preferred embodiment of the present invention, a cooling water passage for engine cooling water is formed in the bracket. According to this configuration, the lubricating oil of the supercharger can be cooled by the engine cooling water.

In another preferred embodiment of the present invention, a partition is provided to isolate the space into a plurality of chambers, and the lubricating oil discharge port and the lubricating oil recirculation hole are divided into the first chamber by the partition. And a blow-by gas passage communicating with the crank chamber and a blow-by gas extraction passage communicating with the intake system passage are formed in the cylinder block, and the blow-by gas passage is provided through a second chamber divided by the partition. To communicate with the blow-by gas extraction passage. According to this configuration, the blow-by gas that has blown into the crank chamber blows up to the second chamber via the blow-by gas passage, so that the pressure of the blow-by gas hardly affects the lubricating oil discharge port that opens to the first chamber. . Thus, it is possible to prevent the lubricating oil from flowing backward from the lubricating oil discharge port due to the blow-by gas pressure, and to improve the lubricating oil drainage of the supercharger. Preferably, the blow-by gas extraction passage is disposed on an engine end wall in an offset region in which one bank is retracted in the crank axis direction, and the offset region of the engine is effectively used.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view showing an embodiment of a V-type engine to which the present invention is applied, and FIGS. 2 and 3 are cross-sectional views taken along lines AA and BB of FIG. 1, respectively. FIG. 4 is a side view of the cylinder block and the supercharger shown in FIG.

Cylinder block 1 of 6-cylinder V-type engine
Is shown in FIGS. 1-4. The cylinder block 1 has left and right banks, and each bank has three cylinders. On the side wall of each bank, a blow-by gas passage 1a communicating with the crank chamber 9 and a cooling water passage 1b for passing engine cooling water are provided. As shown in FIGS. 2 and 3, the rotary supercharger 20 is disposed in a region between the left and right banks. As shown in FIG. 4, the rotary supercharger 20 is substantially composed of a supercharger main body 21 and a drive pulley 22, and a drive pulley 22 provided in front of the supercharger main body 21 has an electromagnetic clutch (not shown). ) Is connected to a rotating shaft in the supercharger main body 21. An endless belt (not shown) is hung on the drive pulley 22, and the torque of the crankshaft is transmitted to the drive pulley 22 via the endless belt.

The supercharger main body 21 is supported by the cylinder block 1 via the bracket 10. As shown in FIG. 3, the bracket 10 includes arms 11, 11 extending upward along the outer shape of the supercharger main body 21, and the arms 11, 11 are generally U-shaped supercharger supports. Is formed. The upper end 12 of each arm 11 is provided with a supercharger body 2.
1 is formed with an upwardly facing flange surface 13 for supporting the mounting arm portion (not shown).
Are drilled. A fixing bolt (not shown) inserted into the mounting arm of the turbocharger main body 21 is inserted into the bolt hole 14,
Fastened to the upper end 12. Thereby, the supercharger body 21
Are firmly fixed to the arm portions 11 and 11. The mounting structure between the bracket 10 and the supercharger main body 21 is disclosed in detail in the above-mentioned Japanese Utility Model Laid-Open Publication No. 1-152030, so that further detailed description will be omitted by referring to the official gazette.

The bracket 10 has a base 15 for supporting each arm 11. The base 15 has a flat bottom surface. A flat bracket mounting surface 2 is formed between the left and right banks of the cylinder block 1, and the bottom surface of the base 15 is supported by the bracket mounting surface 2. As shown in FIG. 1, a plurality of bolt holes 3 are formed in the bracket mounting
The fixing bolts (not shown) inserted into the bolt holes 3 are fastened to the respective bolt holes 3. Thus, the bracket 10 is firmly fixed to the cylinder block 1.

A lubricating oil passage 6 for supplying lubricating oil to the supercharger 20 is formed in the cylinder block 1, and the lubricating oil passage 6 is connected to a lubricating oil supply system 5 of the engine. A lubricating oil passage 16 is formed in the bracket 10, and the lubricating oil passage 16 communicates with a lubricating oil passage 26 of the supercharger 20. These lubricating oil passages 6, 16, and 26 constitute a series of lubricating oil supply passages for supplying lubricating oil to the supercharger 20.

As shown in FIG. 2, the supercharger 20 has a return oil passage 27 for returning lubricating oil to the engine.
The return oil passage 27 communicates with the return oil passage 17 provided in the base 15. A space 4 sandwiched between the banks of the cylinder block 1 is formed below the base 15, and the space 4
Extends downward from the bottom surface of the base 15. The top of the space 4 is defined by the bottom surface of the bracket 10, and both sides of the space 4 are defined by the inner wall of each bank of the cylinder block 1. 1 and 4, both ends of the space 4 are defined by a rear end wall 8a and a front end wall 8d of the cylinder block 1, respectively.

In the space 4, two intermediate partitions 8b and 8c extending over the entire width of the space 4 are provided.
8c is three chambers 4a, 4b, 4 which isolate the space 4 from each other.
c. An opening 1c for attaching a knock sensor is arranged in the chamber 4b located at the center. Further, in the chambers 4a and 4c located before and after the chamber 4b, lubricating oil recirculation holes 7 penetrating the cylinder block 1 are respectively arranged. The chambers 4a and 4c constitute a chamber where the lubricating oil of the supercharger 10 is discharged, and are hereinafter referred to as a lubricating oil discharge chamber.

The lubricating oil return holes 7 are provided in the lubricating oil discharge chambers 4a, 4a
c and the crank chamber 9 are communicated with each other. As shown in FIG. 4, the lubricating oil return hole 7 opening to the lubricating oil discharge chamber 4c
The cylinder block 1 penetrates in the vertical direction. Also,
The lubricating oil recirculation hole 7 opening to the lubricating oil discharge chamber 4a penetrates the rear end wall of the cylinder block 1 diagonally downward and outward as indicated by reference numeral 7a in FIG. The end wall through which the lubricating oil recirculation hole 7 (7a) penetrates constitutes an offset area of the engine end face in which one bank is retracted in the crank axis direction.

The discharge port 18 of the return oil passage 17 is open in each of the lubricating oil discharge chambers 4a and 4c.
The lubricating oil that has lubricated the oil from the lubricating oil discharge chamber 4
a and 4c. The lubricating oil discharged to the lubricating oil discharge chambers 4a and 4c is supplied to the crank chamber 9 through the lubricating oil return holes 7.
And flows back to an oil pan (not shown) of the engine disposed below the crank chamber 9.

The bracket 10 also has a cooling water passage 19 as shown in FIGS. 1 and 4, and the cooling water passage 19 extends over substantially the entire length of the bracket 10. The cooling water passage 19 has an upstream opening 19 a communicating with the radiator.
And a downstream opening 19b communicating with the water pump. The downstream opening 19b communicates with a cooling water passage 1d formed in the cylinder block 1. The tube wall of the cooling water passage 1d is partially formed by the rear end wall 8d.

As described above, in the V-type engine according to the present embodiment, the supercharger main body 21 is attached to the cylinder block 1 by the brackets 10 arranged between the left and right banks. The bracket 10 includes a lubricating oil passage 16 that communicates with a lubricating oil passage 26 of the supercharger 20. The lubricating oil passage 16 communicates with the lubricating oil passage 6 of the cylinder block 1 and the lubricating oil supply system 5. The bracket 10 also has a return oil passage 17 communicating with a return oil passage 27 of the supercharger 20. The return oil passage 17 includes a discharge port 18 that opens to the lubricating oil discharge chambers 4a and 4c formed below the base 15. In the lubricating oil discharge chambers 4a and 4c, lubricating oil return holes 7 for returning lubricating oil to the oil pan via the crank chamber 9 are formed. In such a lubricating oil path, the lubricating oil for the supercharger 20 is supplied from the lubricating oil system 5 to the supercharger 20 via the lubricating oil paths 6, 16, 26. The lubricating oil that has finished lubricating the supercharger 20 is returned to the return oil passages 27 and 17 and the discharge port 1.
8, the oil is discharged to the lubricating oil discharge chambers 4a, 4c, and flows down from the lubricating oil discharge chambers 4a, 4c to the oil pan in the crank chamber 9 through the lubricating oil return hole 7.

According to this configuration, since the lubricating oil path for the supercharger 20 is formed in the bracket 10, there is no need to provide a lubricating oil pipe around the supercharger 20. Therefore, the lubricating oil path can be simplified, and the installation space of the supercharger 20 can be reduced. Further, since the lubricating oil that has lubricated the supercharger 20 flows down to the crank chamber 9 through the lubricating oil discharge chambers 4a and 4c and the lubricating oil return hole 7, the discharge port 1
8 is hardly affected by the pressure fluctuation in the crank chamber 9.
Therefore, the lubricating oil can be smoothly discharged from the discharge port 18, and the lubricating oil discharging property of the supercharger 20 is improved.

In this embodiment, since the cooling water passage 19 is formed in the bracket 10, the lubricating oil circulating through the supercharger 20 can be cooled. Further, since the lubricating oil recirculation hole 7 (7a) opening to the lubricating oil discharge chamber 4c is provided on the end wall of the offset area of the cylinder block 1, the required space of the cylinder block 1 is effectively utilized.

FIG. 5 is a plan view showing another embodiment of a V-type engine to which the present invention is applied, and FIG. 6 is a view showing A─A of FIG.
FIG. 4 is a cross-sectional view taken along a line and a line B─B. In these figures, components that are substantially the same as those of the above-described embodiment are given the same reference numerals. In the engine of this example, only the cooling water passage 1b is provided on the side of each bank, and all blow-by gases are sent to the intake system (not shown) via the space 4. As shown in FIG.
A blow-by gas chamber 31 (chamber 4b) is formed by partitioning the space 4 by a, 8b, and 8c, and a blow-by gas passage 32 communicating with the crank chamber 9 opens to the blow-by gas chamber 31. A blow-by gas extraction passage 33 for sending the blow-by gas in the blow-by gas chamber 31 to the intake system is open to the blow-by gas chamber 31, and the blow-by gas extraction passage 33 penetrates the end wall of the cylinder block 1 and is obliquely upward. And extend outward. Note that the end wall through which the blow-by gas extraction passage 33 penetrates is located in an offset area of the engine end face where one bank is retracted in the crank axis direction.

The lubricating oil discharge chambers 4a, 4c are provided with partition walls 8a, 8
c separates from the blow-by gas chamber 31. As shown in FIGS. 5 and 6, the lubricating oil discharge chambers 4a and 4c are provided with a discharge port 18 and a lubricating oil recirculation hole 7, respectively.
8 is a lubricating oil passage 27 of the supercharger 20 via the lubricating oil passage 17.
Communicate with As shown in FIG. 7, the lubricating oil passage 16 constituting the lubricating oil supply passage connects the lubricating oil passage 26 of the supercharger 20 with the lubricating oil passage 6 of the cylinder block 1 and the lubricating oil supply system 5. ing.

In the above configuration, the blow-by gas chamber 31 is formed in a region between the left and right banks, and the blow-by gas blown into the crank chamber 9 is supplied to the blow-by gas passage 3.
2. The air is sent to the intake system via the blow-by gas chamber 31 and the blow-by gas extraction passage 33. Lubricating oil discharge chamber 4a, 4
c communicates with the crank chamber 9 through the lubricating oil return hole 7, and the blow-by gas chamber 3 is formed by partitions 8a and 8c.
Isolated from one. Therefore, the lubricating oil discharge chambers 4a, 4a
The lubricating oil of the supercharger 20 discharged to c is not substantially affected by the blow-by gas pressure. Thus, it is possible to prevent the lubricating oil from flowing backward due to the blow-by gas or to reduce the oil drainage.

Further, since the blow-by gas extraction passage 33 is provided on the end wall of the offset area of the cylinder block 1, the required space of the cylinder block 1 can be effectively utilized.

[0027]

According to the above construction of the present invention, in the rotary supercharger mounting structure of the V-type engine, the lubricating oil passage of the supercharger is formed in the bracket, and the lubricating oil passage is provided around the supercharger. Since the need for piping is eliminated, the lubricating oil path can be simplified, and the turbocharger installation space can be designed to be compact.

Further, in the above structure of the present invention, in the rotary supercharger mounting structure of the V-type engine, the lubricating oil lubricating the supercharger is discharged into a space separated from the crank chamber, and is passed through the space. Since the configuration is such that the oil is returned to the oil pan in the crank chamber, the discharge pressure of the lubricating oil discharge port is hardly affected by the pressure fluctuation in the crank chamber, and the lubricating oil of the supercharger is smoothly discharged from the lubricating oil discharge port. Therefore, according to such a configuration, it is possible to improve the drainage property of the lubricating oil of the supercharger.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a V-type engine to which the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1;

FIG. 4 is a side view of a cylinder block and a supercharger of the engine shown in FIG.

FIG. 5 is a plan view showing another embodiment of the V-type engine to which the present invention is applied.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a sectional view taken along line BB in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 cylinder block 2 bracket mounting surface 4 space 4a, 4c lubricating oil discharge chamber (first chamber) 5 lubricating oil supply system 6 lubricating oil passage 7 lubricating oil return hole 8 partition wall 9 crank chamber 10 bracket 11 arm portion 15 base 16 lubricating oil Passage 17 Return oil passage 18 Discharge port 19 Cooling water passage 20 Supercharger 21 Supercharger main body 22 Drive pulley 26 Lubrication oil passage 27 Return oil passage 31 Blow-by gas chamber (second chamber) 32 Blow-by gas passage 33 Blow-by gas extraction passage

Claims (3)

(57) [Claims] 1. A rotary supercharger mounting structure for mounting a rotary turbocharger between left and right banks of a V-type engine via a bracket, wherein the bracket is supported by a cylinder block between the left and right banks. And an arm portion extending upward from the base to support the supercharger, the base having a lubricating oil return oil passage communicating the lubricating oil return passage of the supercharger with an oil pan of an engine. A lubricating oil passage that communicates the lubricating oil supply oil passage of the cylinder block with a lubricating oil supply passage of the turbocharger, a bottom surface supported on an upper surface of the cylinder block, and a lubricating oil opening of the return oil passage on the bottom surface. A discharge port, wherein the bottom surface forms a space separated from a crankcase in cooperation with an inner wall of each of the banks, and the cylinder block has a lubricating oil return for communicating the space with the crankcase. V, characterized in that it has a hole
Type turbocharger mounting structure 2. The mounting structure according to claim 1, wherein a cooling water passage for engine cooling water is formed in the bracket. 3. A partition for isolating the space into a plurality of chambers, wherein the lubricating oil discharge port and the lubricating oil recirculation hole are open to a first chamber divided by the partition and communicate with the crank chamber. A blow-by gas passage and a blow-by gas take-out passage communicating with an intake passage are formed in the cylinder block, and the blow-by gas passage communicates with the blow-by gas take-out passage through a second chamber divided by the partition. The rotary supercharger mounting structure for a V-type engine according to claim 1 or 2, wherein: