JP2009156149A - Intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce uncomfortable sound (unclear sound) generated from an internal combustion engine during engine operation. <P>SOLUTION: An intake manifold 5 provided with a volume chamber 2, intake pipes 31-38 of same number as cylinders, and an insertion pipe 4 is arranged between banks of V-type eight cylinder internal combustion engine. The volume chamber 2 includes an intake air inlet part 6 at an end part in a cylinder bank direction. The intake pipes 31-38 opens downward in a bell-mouth shape at both side parts in the volume chamber 2 at one end part thereof and communicate to intake ports of each cylinder at an outside of the volume chamber 2 through an upside of the volume chamber 2 at another end part thereof, for each cylinder group of each bank. The insertion pipe 4 has a hollow cylindrical shape, is provided inside of the volume chamber 2, is connected to the intake air inlet part 6 at one end part thereof and opens at a center part in the cylinder bank direction in the volume chamber 2 at another end part thereof. A recess part forming a part or an extension part of the bell-mouth shape opening part of the intake pipes 31-34 is provided at an outer wall of the insertion pipe 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an intake manifold for an internal combustion engine.

The intake manifold described in Patent Document 1 is disposed between banks of an internal combustion engine (V-type internal combustion engine) having a bank for each of two cylinder groups, and an intake inlet portion (introduction passage) at an end portion in the cylinder row direction. ) And a number of intake pipes (high-rotation passage and low-rotation passage) for supplying intake air from the volume chamber to each cylinder.
JP 2007-127094 A

  When an intake manifold as described in Patent Document 1 is used in the above-described internal combustion engine (V-type internal combustion engine), the intake pipe length of the cylinder on one end side (the intake inlet of the volume chamber) when viewed in the cylinder row direction And the length of the intake pipe of the cylinder on the other end (the length of the pipe from the intake inlet of the volume chamber to the intake port of the cylinder on the other end) There will be a difference. For this reason, a muddy sound (sound of a half order component) is generated from the internal combustion engine during engine operation, and there is a problem that uncomfortable feeling (rumble feeling) is given to the driver. Here, the half order component is, for example, a frequency component that is (n + 1/2) times (n is a natural number) the engine speed.

  In view of such problems, the present invention has an object to reduce unpleasant feeling (rumble feeling) of a driver or the like by suppressing generation of a sound of a half-order component during engine operation.

  Therefore, an intake manifold according to the present invention is disposed between banks of an internal combustion engine having a bank for each of two cylinder groups, and has a volume chamber having an intake inlet at the end in the cylinder row direction, and one end for each cylinder group Are opened in a bell mouth shape on both sides of the volume chamber, and the other end is opened outside the volume chamber. The intake pipes for the number of cylinders having different extending directions for each cylinder group are disposed in the volume chamber. In addition, one end portion is connected to the intake inlet portion, and the other end portion is provided with an insertion pipe that opens to an intermediate portion in the cylinder row direction in the volume chamber.

  According to the present invention, one end portion of the insertion pipe is connected to the intake inlet portion, and the other end portion is opened at the intermediate portion in the cylinder row direction in the volume chamber. The intake pipe length (the pipe length from the intake inlet of the volume chamber to the intake port of the cylinder on one end side) and the intake pipe length of the cylinder on the other end (from the intake inlet of the volume chamber to the other end side) The pipe length to the intake port of the cylinder) is equalized. Thereby, since the generation of the sound of the half order component during engine operation is suppressed, it is possible to reduce uncomfortable feeling (rumble feeling) of the driver or the like.

  In an internal combustion engine having a two-system intake system that has two intake passages independent of each other and performs intake through these passages, the present invention is applied, and the two intake passages are connected to the intake inlet portion of the volume chamber. By merging on the upstream side, it is possible to realize the above-described equal length of the intake pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view of an internal combustion engine according to a first embodiment of the present invention, FIG. 2 is a schematic front view of the internal combustion engine, and FIG. 3 is a diagram showing details of an intake manifold in the ZZ cross section of FIG. .

  The internal combustion engine 1 is a V-type 8-cylinder internal combustion engine composed of two banks on the left and right sides. The left bank 1A includes four cylinders # 1, # 3, # 5, and # 7, and the right bank 1B includes four cylinders. Two cylinders # 2, # 4, # 6, and # 8 are provided. That is, the internal combustion engine 1 includes a bank for each of two cylinder groups.

  Between the left bank 1A and the right bank 1B of the internal combustion engine 1, above the internal combustion engine 1, an intake manifold 5 having a volume chamber 2, intake pipes 31 to 38 for the number of cylinders, and insertion pipes 4 is provided. Is arranged. Here, the intake pipes 31 to 38 correspond to the cylinders # 1 to # 8.

  The volume chamber 2 provided in the intake manifold 5 has an intake inlet 6 at an end in the cylinder row direction (end on the cylinder # 1, # 2 side). An intake passage (not shown) including an air cleaner (not shown) and a throttle valve (not shown) for adjusting the amount of intake air is connected to the intake inlet 6 in the middle. The intake passage may be branched into two on the upstream side of the intake inlet portion 6 and each may be provided with an air cleaner and a throttle valve.

  The intake pipes 31, 33, 35, and 37 corresponding to the left bank 1 </ b> A have respective one end portions opened downward in a bell mouth shape on the right bank 1 </ b> B side of the volume chamber 2, and pass through the upper side of the volume chamber 2. Each other end penetrates the bottom wall on the left bank 1A side of the volume chamber 2 and communicates with the intake port of each cylinder of the left bank 1A independently. Here, the bell mouth-shaped openings of the intake pipes corresponding to the left bank 1A are arranged in parallel with the upper wall of the volume chamber 2 in the cylinder row direction.

  On the other hand, each of the intake pipes 32, 34, 36, and 38 corresponding to the right bank 1B has a bell mouth opening downward on the left bank 1A side of the volume chamber 2, and the upper side of the volume chamber 2 is opened. Each of the other ends penetrates the bottom wall on the right bank 1B side of the volume chamber 2 and communicates independently with the intake port of each cylinder of the right bank 1B. Here, the bell mouth-shaped openings of the intake pipes corresponding to the right bank 1B are arranged in parallel with the upper wall of the volume chamber 2 in the cylinder row direction.

  Thus, the extending direction of the intake pipes 31, 33, 35, 37 corresponding to the left bank 1A and the extending direction of the intake pipes 32, 34, 36, 38 corresponding to the right bank 1B are different from each other. Yes.

Here, the ventilation resistance is reduced by making the opening part (one end part) of the intake pipes 31-38 into a bell mouth shape.
The insertion tube 4 has a hollow cylindrical shape and is provided inside the volume chamber 2. One end of the insertion tube 4 is connected to the intake inlet 6, and the other end opens at an intermediate portion in the cylinder row direction in the volume chamber 2. ing. The opening (other end) of the insertion pipe 4 is set at an intermediate position between, for example, a bell mouth opening of the intake pipe 31 and a bell mouth opening of the intake pipe 38. Thus, when viewed in the cylinder row direction, the intake pipe length of each cylinder on one end side (cylinder # 1, # 2 side) and the intake pipe length on the other end side (cylinder # 7, # 8 side) are Since the length is equalized, the difference in the intake pipe length between the cylinders is reduced as compared with the case where the insertion pipe 4 is not provided, and the generation of the sound of the half order component is reduced.

FIG. 4 is a diagram showing the sound vibration performance of the internal combustion engine in the present embodiment.
The vertical axis of this figure indicates the sound pressure level of the sound (engine sound) generated in the internal combustion engine 1, and the sound pressure level becomes higher as the sound pressure level is worse.

On the other hand, the horizontal axis quantifies the sense of transparency / discomfort felt by the driver or the like from the engine sound. The worse the transparency / discomfort, the more half-order component sounds are generated.
Here, “conventional” surrounded by a dotted circle shown in the figure corresponds to the sound vibration performance of the engine sound when the insertion pipe 4 is not provided in the configuration of the intake manifold 5 in the present embodiment. is doing. Further, “with insertion tube” shown in the figure corresponds to the sound vibration performance of the engine sound when the intake manifold 5 in the present embodiment is used.

  In this figure, it is shown that “with insertion tube” has better transparency and discomfort than “conventional”. This is because by providing the intake manifold 5 with the insertion pipe 4, the difference in the intake pipe length between the cylinders is reduced, and the generation of the sound of the half order component is reduced.

  According to the present embodiment, the volume chamber 2 that is disposed between the banks of the internal combustion engine 1 that includes the banks (1A, 1B) for each of the two cylinder groups, and that has the intake inlet 6 at the end in the cylinder row direction, A cylinder group in which one end of each cylinder group opens in a bell mouth shape downward on both sides in the volume chamber 2, passes through the upper side of the volume chamber 2, and the other end opens outside the volume chamber 2. Intake pipes 31 to 38 corresponding to the number of cylinders having different extending directions for each cylinder, and disposed in the volume chamber 2, one end portion is connected to the intake inlet portion 6, and the other end portion is a cylinder in the volume chamber 2. Since the insertion pipe 4 that opens in the middle in the column direction is provided, the intake pipe length between the cylinders (from the intake inlet 6 of the volume chamber 2 to the intake port of each cylinder as compared with the case where the insertion pipe 4 is not provided). The difference in the pipe length) is reduced. For this reason, since the equal length of the intake pipe length of each cylinder can be improved, it is possible to suppress generation of a sound of a half order component during engine operation.

  In the present embodiment, the suction area at the opening (the other end) of the insertion pipe 4 is increased by increasing the cross-sectional area of the insertion pipe 4 toward the intermediate portion in the cylinder row direction in the volume chamber 2. Since the change in the air flow rate and the ventilation resistance can be reduced, the charging efficiency of each cylinder can be improved.

Next, a second embodiment of the present invention will be described.
2nd Embodiment differs in the structure of the insertion tube 4 among 1st Embodiment shown in FIGS. 1-3. This difference will be described with reference to FIGS.

  FIG. 5 is a perspective view of the insertion tube in the second embodiment, FIGS. 6A to 6C are a plan view, a front view, and a right side view of the insertion tube, and FIG. 7 is a second embodiment. FIG. 2 is a diagram showing details of an intake manifold in the ZZ cross section of FIG. 1 when the insertion pipe in FIG.

  In the second embodiment, the hollow cylindrical (outer diameter D1) insertion tube 4 has a pair of groove-like recesses 71 and 72 (vertical) extending on the outer wall in the cylinder row direction (extending direction of the insertion tube 4). The difference from the first embodiment is that a direction depth T1) is provided.

The groove-like recess 71 is provided on the left bank 1A side, and forms a part of the bell mouth-like opening of the intake pipes 32, 34 of the right bank 1B or an extension thereof.
On the other hand, the groove-like recess 72 is provided on the right bank 1B side and forms a part of the bell mouth-like opening of the intake pipes 31 and 33 of the left bank 1A or an extension thereof.

  Thus, by providing the groove-like recesses 71 and 72 on the outer wall of the insertion pipe 4, the space near the bell mouth-shaped opening of the intake pipes 31 to 34 can be expanded, so that the intake pipes 31 to 34 are expanded. Ventilation resistance at the bell mouth-shaped opening is reduced.

Next, a specific example of the positional relationship between the groove-shaped recess of the insertion tube and the bell mouth-shaped opening of the intake tube according to this embodiment will be described with reference to FIG.
7A and 7B, the bell mouth opening of the intake pipes 32 and 33 corresponds to the intermediate position between the upper and lower ends of the groove-like recesses 71 and 72 of the insertion pipe 4. It is arranged. For this reason, since the groove-like recesses 71 and 72 of the insertion tube 4 are adjacent to the bell mouth-like openings of the intake pipes 32 and 33, the space near the bell mouth-like openings of the intake pipes 32 and 33 is expanded. The Further, by cutting out the wall surface on the groove-like recesses 71, 72 side of the wall surface of the bell mouth-shaped opening of the intake pipes 32, 33, part of the intake air in the volume chamber 2 is inserted into the insertion pipe 4. It is possible to smoothly go to the bell mouth-shaped openings of the intake pipes 32 and 33 through the groove-shaped recesses 71 and 72.

  In FIG. 7A, the wall surfaces of the bell mouth-like openings of the intake pipes 32 and 33 are arranged so as to contact the groove-like recesses 71 and 72 of the insertion pipe 4, but FIG. Then, it arrange | positions so that the wall surface of the bell mouth-shaped opening part of the intake pipes 32 and 33 may not contact the groove-shaped recessed parts 71 and 72 of the insertion pipe 4. FIG.

  In FIG. 7C, the wall surfaces of the bell mouth-shaped openings of the intake pipes 32 and 33 are arranged so as to be in contact with the upper ends of the groove-shaped recesses 71 and 72 of the insertion pipe 4. As a result, the groove-like recesses 71 and 72 of the insertion tube 4 are located below the bell mouth-shaped openings of the intake pipes 32 and 33, so that a part of the intake air in the volume chamber 2 is converted into the intake pipe 4. It is possible to smoothly go to the bell mouth-shaped openings of the intake pipes 32 and 33 through the groove-shaped recesses 71 and 72.

  In particular, according to the present embodiment, the outer wall of the insertion pipe 4 is provided with groove-like recesses 71 and 72 that form part of the bell mouth-like opening of the intake pipes 31 to 34 or an extension thereof, thereby reducing the volume. A portion of the intake air in the chamber 2 can smoothly go to the bell mouth-like openings of the intake pipes 31 to 34 via the groove-like recesses 71 and 72 on the outer wall of the insertion pipe 4, and the intake pipe 31. The space in the vicinity of the ~ 34 bell mouth opening can be expanded. For this reason, the airflow resistance at the bell mouth opening of the intake pipes 31 to 34 is reduced, so that the charging efficiency is improved particularly in the cylinders # 1 to # 4.

  Further, according to the present embodiment, the groove-like recesses 71 and 72 provided on the outer wall of the insertion pipe 4 extend in the cylinder row direction, so that the insertion pipe 4 is connected to the intake manifold at the manufacturing stage of the intake manifold 5. 5 is installed from the intake inlet 6 side, the interference between the bell mouth opening of the intake pipes 31 to 34 and the groove-like recesses 71 and 72 can be prevented. 4 can be installed.

  Further, according to the present embodiment, by providing the groove-like recesses 71 and 72 on the outer wall of the insertion tube 4, the strength of the insertion tube 4 (bending strength and The torsional strength) can be increased.

Next, a third embodiment of the present invention will be described.
The third embodiment is different from the above-described second embodiment in the configuration of the insertion tube 4. This difference will be described with reference to FIGS.

FIG. 8 is a perspective view of the insertion tube in the third embodiment, and FIGS. 9A to 9C are a plan view, a front view, and a right side view of the insertion tube.
In the third embodiment, the insertion tube 4 has one end portion (outer diameter D1) connected to the intake inlet portion 6 and the other end portion (outer diameter D2) at the intermediate portion in the cylinder row direction in the volume chamber 2. Open. Here, the outer diameter D2 of the other end of the insertion tube 4 is larger than the outer diameter D1 of the one end of the insertion tube 4. That is, the insertion pipe 4 has a larger cross-sectional area toward the middle in the cylinder row direction in the volume chamber 2.

  Accordingly, the pair of groove-like recesses 71 and 72 provided on the outer wall of the insertion pipe 4 and extending in the cylinder row direction (extending direction of the insertion pipe 4) are at a depth T1 in the vertical direction at one end thereof. In comparison, the depth T2 in the vertical direction at the other end is larger. By forming the groove-shaped recesses 71 and 72 in this way, when the intake pipe 4 is inserted and installed from the intake inlet 6 side of the intake manifold 5 in the manufacturing stage of the intake manifold 5, the intake pipes 31 to 34 are installed. And the groove-like recesses 71 and 72 can be prevented, so that the insertion tube 4 can be easily installed.

  In particular, according to the present embodiment, the insertion pipe 4 has a cross-sectional area that increases toward the intermediate portion in the cylinder row direction in the volume chamber 2, so intake air at the opening (the other end) of the insertion pipe 4. Therefore, the charging efficiency in each cylinder can be improved.

Next, a fourth embodiment of the present invention will be described.
The fourth embodiment is different from the above-described third embodiment in the configuration of the insertion tube 4. This difference will be described with reference to FIGS.

FIG. 10 is a perspective view of the insertion tube in the fourth embodiment, and FIGS. 11A to 11C are a plan view, a front view, and a right side view of the insertion tube.
In the fourth embodiment, the upper wall surface of the insertion tube 4 extends in parallel with the upper wall of the volume chamber 2 in the cylinder row direction. The insertion tube 4 has one end (outer diameter D1) connected to the intake inlet 6 and the other end (outer diameter D3) opened at an intermediate portion in the cylinder row direction in the volume chamber 2. Here, the outer diameter D3 of the other end of the insertion tube 4 is larger than the outer diameter D1 of the one end of the insertion tube 4. That is, the insertion pipe 4 has an upper wall surface extending in parallel with the upper wall of the volume chamber 2 in the cylinder row direction, and a bottom wall of the volume chamber 2 as the lower wall surface is directed toward the middle portion of the volume chamber 2 in the cylinder row direction. Inclined to the side.

  In the present embodiment, the pair of groove-like recesses 71 and 72 provided on the outer wall of the insertion tube 4 and extending in the cylinder row direction (extending direction of the insertion tube 4) are provided from one end to the other end. The vertical depth T1 is constant. This is because the bell mouth opening column of the intake pipes of each bank and the upper wall surface of the intake pipe 4 are arranged in parallel with the upper wall of the volume chamber 2 in the cylinder row direction.

  In particular, according to the present embodiment, the insertion tube 4 has an upper wall surface extending in parallel with the upper wall of the volume chamber 2 in the cylinder row direction, and a lower wall surface toward the intermediate portion in the cylinder row direction of the volume chamber 2. By tilting toward the bottom wall of the volume chamber 2, the vertical depth T1 of the groove-like recesses 71 and 72 can be made constant. The recesses 71 and 72 can be easily formed.

  In addition, the insertion pipe 4 having the cross-sectional area described in the third embodiment can be inclined by tilting the center line toward the bottom wall side of the volume chamber 2 toward the center of the volume chamber 2 in the cylinder row direction. Since the vertical depth T1 of the groove-like recesses 71, 72 can be made constant, the groove-like recesses 71, 72 can be easily formed at the time of manufacture as compared with the third embodiment.

Next, a fifth embodiment of the present invention will be described.
5th Embodiment differs in the structure of the insertion pipe 4 among 1st Embodiment shown in FIGS. 1-3. This difference will be described with reference to FIGS.

FIG. 12 is a perspective view of an insertion tube in the fifth embodiment, FIGS. 13A to 13C are a plan view, a front view, and a right side view of the insertion tube, and FIG. 14 is a fifth embodiment. FIG. 2 is a diagram showing details of an intake manifold in the ZZ cross section of FIG. 1 when the insertion pipe in FIG.
It is.

  In the fifth embodiment, the hollow cylindrical (outer diameter D1) insertion tube 4 is provided with recesses 81 to 84 (depth T4 in the vertical direction) on the outer wall corresponding to each intake tube. This is different from the first embodiment. Here, the recesses 81 to 84 correspond to the intake pipes 31 to 34.

The recesses 81 and 83 are provided on the right bank 1B side, and form a part of the bell mouth-like opening of the intake pipes 31 and 33 corresponding to the left bank 1A or an extension thereof.
On the other hand, the recesses 82 and 84 are provided on the left bank 1A side, and form part of the bell mouth-like opening of the intake pipes 32 and 34 corresponding to the right bank 1B or an extension thereof.

  In this manner, by providing the recesses 81 to 84 on the outer wall of the insertion pipe 4, the space near the bell mouth opening of the intake pipes 31 to 34 can be expanded. Ventilation resistance in the shape of the opening is reduced.

Next, a specific example of the positional relationship between the recessed portion of the insertion tube and the bell mouth-shaped opening of the intake tube in the present embodiment will be described with reference to FIG.
In FIG. 14A, the bell mouth-shaped openings of the intake pipes 32 and 33 are arranged so as to correspond to the intermediate positions between the upper and lower ends of the recesses 82 and 83 of the insertion pipe 4. For this reason, since the concave portions 82 and 83 of the insertion tube 4 are adjacent to the bell mouth opening of the intake pipes 32 and 33, the space near the bell mouth opening of the intake pipes 32 and 33 is expanded. Further, by cutting out the wall surface on the side of the recesses 82 and 83 among the wall surfaces of the bell mouth-shaped openings of the intake pipes 32 and 33, a part of the intake air in the volume chamber 2 is made to be the recess 82 of the insertion pipe 4. , 83 can be smoothly routed to the bell mouth opening of the intake pipes 32, 33.

  In FIG. 14A, the wall surfaces of the bell mouth-shaped openings of the intake pipes 32 and 33 are arranged so as not to contact the recesses 82 and 83 of the insertion pipe 4. In the manufacturing stage of the intake manifold 5, when the insertion pipe 4 is inserted and installed from the intake inlet 6 side of the intake manifold 5, the bell mouth-like openings of the intake pipes 31 to 34 and the insertion pipe 4 This is to prevent interference with the outer wall.

  In FIG. 14B, the wall surfaces of the bell mouth-like openings of the intake pipes 32 and 33 are arranged so as to be in contact with the upper ends of the recesses 82 and 83 of the insertion pipe 4. As a result, the recesses 82 and 83 of the insertion tube 4 are positioned below the bell mouth-shaped openings of the intake pipes 32 and 33, so that a part of the intake air in the volume chamber 2 is reduced to the recess 82 of the intake pipe 4. , 83 can be smoothly routed to the bell mouth opening of the intake pipes 32, 33.

  In particular, according to the present embodiment, the recesses 81 to 84 forming part of the bell mouth-like opening of the intake pipes 31 to 34 or the extension thereof are formed on the outer wall of the insertion pipe 4 independently for each cylinder. Thus, a part of the intake air in the volume chamber 2 can smoothly go to the bell mouth-like openings of the intake pipes 31 to 34 via the recesses 81 to 84 of the outer wall of the insertion pipe 4. At the same time, the space near the bell mouth opening of the intake pipes 31 to 34 can be expanded. For this reason, since the ventilation resistance is reduced by the bell mouth opening of the intake pipes 31 to 34, the charging efficiency is improved particularly in the cylinders # 1 to # 4.

Next, a sixth embodiment of the present invention will be described.
The sixth embodiment is different from the fifth embodiment described above in the configuration of the insertion tube 4. This difference will be described with reference to FIG.

(A)-(c) of Drawing 15 is a top view, a front view, and a right side view of an insertion tube in a 6th embodiment.
In the sixth embodiment, the insertion tube 4 has one end portion (outer diameter D1) connected to the intake inlet portion 6 and the other end portion (outer diameter D2) at the intermediate portion in the cylinder row direction in the volume chamber 2. Open. Here, the outer diameter D2 of the other end of the insertion tube 4 is larger than the outer diameter D1 of the one end of the insertion tube 4. That is, the insertion pipe 4 has a larger cross-sectional area toward the middle in the cylinder row direction in the volume chamber 2.

  Accordingly, the recesses 81 to 84 provided on the outer wall of the insertion tube 4 for each cylinder are directed toward the other end side of the insertion tube 4 (on the intermediate side in the cylinder row direction in the volume chamber 2). The depth in the vertical direction increases (for example, as shown in the figure, the depth T5 in the vertical direction of the recess 84 is larger than the depth T4 in the vertical direction of the recess 82).

  In particular, according to the present embodiment, the insertion pipe 4 has a cross-sectional area that increases toward the intermediate portion in the cylinder row direction in the volume chamber 2, so intake air at the opening (the other end) of the insertion pipe 4. Therefore, the charging efficiency in each cylinder can be improved.

Next, a seventh embodiment of the present invention will be described.
The seventh embodiment differs from the sixth embodiment described above in the configuration of the insertion tube 4. This difference will be described with reference to FIG.

(A)-(c) of Drawing 16 is a top view, a front view, and a right side view of an insertion tube in a 7th embodiment.
In the seventh embodiment, the upper wall surface of the insertion tube 4 extends in parallel with the upper wall of the volume chamber 2 in the cylinder row direction. The insertion tube 4 has one end (outer diameter D1) connected to the intake inlet 6 and the other end (outer diameter D3) opened at an intermediate portion in the cylinder row direction in the volume chamber 2. Here, the outer diameter D3 of the other end of the insertion tube 4 is larger than the outer diameter D1 of the one end of the insertion tube 4. That is, the upper wall surface of the insertion tube 4 extends in parallel with the upper wall of the volume chamber 2 in the cylinder row direction, and the bottom wall of the volume chamber 2 becomes closer to the middle portion of the volume chamber 2 in the cylinder row direction. Inclined to the wall side.

  Moreover, in this embodiment, the recessed part 81-84 provided in the outer wall of the insertion pipe 4 for every cylinder each has the constant depth T4 of each perpendicular | vertical direction. This is because the bell mouth opening column of the intake pipes of each bank and the upper wall surface of the intake pipe 4 are arranged in parallel with the upper wall of the volume chamber 2 in the cylinder row direction.

  In particular, according to the present embodiment, the insertion tube 4 has an upper wall surface extending in parallel with the upper wall of the volume chamber 2 in the cylinder row direction, and a lower wall surface toward the intermediate portion in the cylinder row direction of the volume chamber 2. Since the vertical depth T4 of the recesses 81 to 84 can be made constant by inclining to the bottom wall side of the volume chamber 2, the recesses 81 to 84 can be easily formed at the time of manufacture compared to the sixth embodiment. Can be formed.

  In addition, the insertion pipe 4 having the cross-sectional area described in the sixth embodiment can be inclined by tilting the center line toward the bottom wall side of the volume chamber 2 toward the center of the volume chamber 2 in the cylinder row direction. Since the depth T4 in the vertical direction of the recesses 81 to 84 can be made constant, the recesses 81 to 84 can be easily formed at the time of manufacture as compared with the sixth embodiment.

  In the embodiment of the present invention, the V-type 8-cylinder internal combustion engine has been described. However, the number of cylinders is not limited to this, and the V-type multi-cylinder internal combustion engine including the V-type 6-cylinder is also applicable. The present invention can be applied.

  In the embodiment of the present invention, the V-type internal combustion engine has been described. However, the present invention can also be applied to a horizontally opposed internal combustion engine having a bank for each of two cylinder groups. .

1 is a schematic plan view of an internal combustion engine according to a first embodiment. 1 is a schematic front view of an internal combustion engine according to a first embodiment. The figure which shows the detail of the intake manifold in the ZZ cross section of FIG. The figure which shows the sound vibration performance of the internal combustion engine in 1st Embodiment The perspective view of the insertion tube in 2nd Embodiment Plan view, front view, right side view of insertion tube in second embodiment The figure which shows the detail of the intake manifold in 2nd Embodiment The perspective view of the insertion tube in 3rd Embodiment Plan view / front view / right side view of the insertion tube in the third embodiment The perspective view of the insertion tube in a 4th embodiment Plan view, front view, right side view of insertion tube in fourth embodiment The perspective view of the insertion tube in a 5th embodiment Plan view, front view, right side view of insertion tube in fifth embodiment The figure which shows the detail of the intake manifold in 5th Embodiment Plan view, front view, right side view of insertion tube in sixth embodiment The top view, front view, right side view of the insertion tube in the seventh embodiment

Explanation of symbols

1 Internal combustion engine (V type 8 cylinder)
DESCRIPTION OF SYMBOLS 1A Left bank 1B Right bank 2 Volume chamber 31-38 Intake pipe 4 Insertion pipe 5 Intake manifold 6 Intake inlet part 71,72 Groove-shaped recessed part 81-84 Recessed part

Claims (7)

An internal combustion engine intake manifold having a bank for each of two cylinder groups,
A volume chamber disposed between the banks and having an intake inlet at an end in the cylinder row direction;
Intake pipes corresponding to the number of cylinders having different extending directions for each cylinder group, each cylinder group having one end opened in a bell mouth shape on both sides in the volume chamber and the other end opened outside the volume chamber When,
An intake manifold, comprising: an insertion pipe disposed in the volume chamber, having one end connected to the intake inlet, and the other end opened to an intermediate portion in the cylinder row direction in the volume chamber.   The intake manifold according to claim 1, wherein a concave portion for forming a part of the bell mouth-like opening of the intake pipe or an extension thereof is provided on the outer wall of the insertion pipe.   The intake manifold according to claim 2, wherein the recess has a groove shape extending in a cylinder row direction.   The intake manifold according to claim 2, wherein the recess is provided independently for each intake pipe.   The intake manifold according to any one of claims 1 to 4, wherein the insertion pipe has a cross-sectional area that increases toward a middle portion in the cylinder row direction in the volume chamber.   The insertion tube has an upper wall surface extending in the cylinder row direction in parallel with the upper wall of the volume chamber, and a lower wall surface toward the middle portion of the volume chamber in the cylinder row direction toward the bottom wall side of the volume chamber. 6. The intake manifold according to claim 5, wherein the intake manifold is inclined.   The intake pipe has one end opened in a bell mouth shape downward on both sides in the volume chamber, passes through the upper side of the volume chamber, and the other end opens outside the volume chamber. The intake manifold according to any one of claims 1 to 6.

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