JP2023084772A - Intake device - Google Patents

Abstract

To provide an intake device capable of improving distribution performance of intake air to a plurality of ports of a surge tank.SOLUTION: An intake device 100 comprises: an intake passage 1; a surge tank 2 having a space into which intake air flows from the intake passage 1; a plurality of ports 3 which are connected to the surge tank 2, into which intake air flows from the surge tank 2, and which are arranged at intervals along the direction of flow of intake air inside the surge tank 2; and a plurality of fastener holes 4a into which fastening members F are inserted for fixing an intake device body, which includes the intake passage 1, the surge tank 2, and the plurality of ports 3, to a cylinder head E11 of an engine E. The surge tank 2 includes bulge portions 20 which each bulges from the inside of the surge tank 2 to the outside so as to straddle a straight line S, which is a straight line S connecting adjacent fastening holes 4a between the adjacent fastening holes 4a and in contact with the adjacent fastening holes 4a from the port 3 side, as viewed from the direction of insertion of the fastening member F into the fastener hole 4a.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system, and more particularly to an intake system having multiple ports.

Conventionally, an intake device having a plurality of ports is known (see Patent Document 1, for example).

The aforementioned Patent Document 1 discloses an intake system that includes an intake passage, a surge tank into which intake air flows from the intake passage, and a plurality of ports that distribute the intake air from the surge tank to the engine. The intake device is attached to the engine from above. In the surge tank, both left and right inner side surfaces in the surge tank extend substantially linearly toward the downstream side along the flow direction of intake air in the surge tank in a plan view. The plurality of ports are arranged from the upstream side to the downstream side along the flow direction of intake air in the surge tank.

U.S. Patent Application Publication No. 2011/0253080

However, in the intake device described in Patent Document 1, both the left and right inner side surfaces in the surge tank extend substantially linearly toward the downstream side along the flow direction of the intake air in the surge tank in plan view. As a result, the intake air flowing near both the left and right inner surfaces in the surge tank receives little resistance from the left and right inner surfaces, so it can easily flow toward the downstream port. As a result, the amount of intake air flowing into the port on the downstream side tends to be relatively large, and there is a problem that the intake air distribution performance of the surge tank is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and one object of the present invention is to provide an intake system capable of improving the performance of distributing intake air to a plurality of ports of a surge tank. It is to be.

To achieve the above object, an intake system according to one aspect of the present invention includes an intake passage, a surge tank that is a space into which intake air flows from the intake passage, and a surge tank that is connected to the surge tank and receives intake air from the surge tank. A plurality of ports spaced apart along the flow direction of intake air in the surge tank, and a fastening member for fixing the intake system body including the intake passage, the surge tank and the plurality of ports to the cylinder head of the engine. and the surge tank is a straight line connecting the adjacent fastening holes between the adjacent fastening holes when viewed from the direction of insertion of the fastening member into the fastening holes, and is adjacent from the port side It includes a bulging portion that bulges outward from the inside of the surge tank so as to straddle a straight line in contact with the fastening hole.

In the air intake device according to one aspect of the present invention, as described above, when viewed from the direction in which the fastening member is inserted into the fastening holes, the straight line connecting the adjacent fastening holes is a straight line that connects the adjacent fastening holes from the port side. A surge tank is provided with a bulging part that bulges outward from the inside of the surge tank so as to straddle a straight line in contact with the matching fastening holes. As a result, compared to the conventional configuration in which both the left and right inner side surfaces in the surge tank extend substantially linearly toward the downstream side along the flow direction of the intake air in the surge tank, Resistance can be given to intake air flowing along the flow direction of the intake air. For this reason, compared to the above-described conventional configuration, the amount of intake air flowing into the ports on the downstream side is smaller, and the amount of intake air flowing into the ports on the upstream side is larger. Uniformity of the amount can be achieved. As a result, it is possible to improve the performance of distributing the intake air to the plurality of ports of the surge tank. Moreover, the tank capacity of the surge tank can be expanded by the swelling portion.

In the intake device according to the above aspect, preferably, a plurality of bulging portions are provided corresponding to the plurality of ports, and the surge tank is provided between adjacent bulging portions and extends inwardly of the surge tank. Including recessed recesses.

With this configuration, the inner surface of the surge tank can be finely divided by the recesses, so that the recesses function as nodes of the inner surface of the surge tank during air intake, thereby reducing the amplitude of the inner surface of the surge tank. can. As a result, noise caused by vibration of the surge tank can be suppressed.

In this case, preferably, the inner surface of the bulging portion causes the intake air to flow along the inner surface of the bulging portion, thereby allowing the intake air to flow along the inner surface toward the port corresponding to the bulging portion along which the intake air flows, and to the port on the downstream side. It is configured to direct the intake air toward the

With this configuration, the bulging portion can distribute the intake air to at least the port closest to the bulging portion along which the intake air flows along the inner surface and the downstream port, so that the distribution to the plurality of ports is uniform. It is possible to further improve the distribution performance of the intake air by further improving the efficiency.

In the configuration in which the intake air flows toward the port on the downstream side by flowing the intake air along the inner surface of the bulging portion, preferably, the inner surface of the bulging portion is formed so that the intake air flows along the inner surface of the bulging portion. It is configured to direct intake air toward a port one downstream of the ports corresponding to the bulge along which the intake air flows.

With this configuration, the bulging portion allows at least the port closest to the bulging portion along which the intake air flows along the inner surface and the port one downstream side of the ports corresponding to the bulging portion along which the intake air flows along the inner surface. Since the intake air can be distributed, the performance of distributing the intake air to the plurality of ports can be further improved.

In the configuration in which the intake air flows along the inner surface of the bulging portion so that the intake air flows along the inner surface of the bulging portion, the plurality of ports preferably includes: A plurality of bulging portions are arranged in two rows along the flow direction of intake air in the surge tank, and the inner surface of the bulging portion is made to flow along the inner surface of the bulging portion of one row so that the bulging portion of one row is configured to flow intake air toward the other row of ports downstream of one of the ports corresponding to .

With this configuration, the bulging portion can distribute the intake air to at least one row of ports closest to the bulging portion along the inner surface of which the intake air flows and the other row of ports. For this reason, in the plurality of ports arranged in two rows, it is possible to suppress variations in intake air for each row.

In the structure in which the intake air flows along the inner surface of the bulging portion to flow the intake air toward the port on the downstream side, preferably, the inner surface of the bulging portion is a surge tank when viewed from the direction in which the fastening member is inserted into the fastening hole. It includes an inclined surface located inside the surge tank toward the downstream side of the surge tank and inclined so that the flow along the inner surface of the surge tank is directed toward the port downstream of the recess.

With this configuration, the inclined surface can regulate the flow of intake air and easily flow the intake air toward a predetermined port on the downstream side of the recess.

In the intake device according to the above aspect, preferably, the swelling portion is formed in an arc shape when viewed from the direction of inserting the fastening member into the fastening hole.

With this configuration, it is possible to suppress the disturbance of the flow of intake air by causing the intake air to flow along the inner surface of the arcuate bulging portion.

In this case, preferably, a plurality of bulging portions are provided corresponding to the plurality of ports, and the arc-shaped bulging portion corresponding to the most downstream port is located inside the plurality of arc-shaped bulging portions corresponding to the plurality of ports. and the radius of the arcuate bulge is the smallest.

With this configuration, the intake air flows along the inner surface of the arc-shaped bulging portion corresponding to the most downstream port, and the inner surface of the arc-shaped bulging portion having the smallest radius. Since the direction of the intake air can be greatly bent at , the greatly bent intake air can be effectively flowed to the most downstream port. As a result, it is possible to suppress the return of the intake air from the most downstream position in the surge tank to the upstream side.

In the configuration in which the bulging portion includes a recess, preferably, the bulging portion is connected to the bulging portion on the upstream side of the surge tank and is connected to an external gas inlet for introducing external gas into the surge tank. a pressure measurement chamber in which a pressure sensor is arranged to measure the pressure of the recess, the recess being arranged between the external gas inlet and the pressure measurement chamber.

With this configuration, the external gas inlet and the pressure measuring chamber can be separated from each other by the concave portion, so that the liquid content flowing in together with the external gas from the external gas inlet can be suppressed from reaching the pressure measuring chamber. can be done. As a result, the pressure in the surge tank can be measured by the pressure sensor in a state where the pressure sensor is substantially free of liquid.

In the intake device according to the above aspect, the following configuration is also conceivable.

(Appendix 1)
That is, in the intake system according to the above aspect, the intake system main body is mounted from above on a V-shaped engine in which the pair of banks extends parallel to the flow direction of intake air in the surge tank. It is configured.

With this configuration, the intake air distribution performance can be improved in the intake device attached to the V-type engine in which the direction in which the pair of banks extend parallel to the flow direction of the intake air in the surge tank coincides. .

It is a front view showing a state in which the intake device according to the embodiment is installed in the engine. It is a side view of an air intake device by an embodiment. FIG. 3 is a cross-sectional view taken along line 90-90 shown in FIG. 2, and is a diagram for explaining the degree of swelling of the swelling portion of the intake device; FIG. 3 is a cross-sectional view taken along line 90-90 shown in FIG. 2, and is a diagram for explaining the radius of the arcuate swelling portion of the intake device; FIG. 3 is a cross-sectional view taken along line 90-90 shown in FIG. 2 and is a diagram for explaining the flow of intake air in the intake device; It is a figure for demonstrating the swelling part of the intake device of a 1st modification. It is a figure for demonstrating the swelling part of the intake device of a 2nd modification.

Hereinafter, embodiments will be described based on the drawings.

[Embodiment]
A configuration of an intake device 100 according to an embodiment will be described with reference to FIGS. 1 to 5. FIG.

The intake system 100 shown in FIG. 1 is configured to distribute intake air to the engine E. As shown in FIG. The engine E is, for example, an engine for a vehicle (automobile). Also, the engine E is a multi-cylinder V-type engine having a pair of banks B. As shown in FIG. Specifically, the engine E is a 6-cylinder V-type engine in which one bank B is provided with three cylinders E1 (only one is shown in FIG. 1). A piston E10 of each cylinder E1 arranged in a V shape is connected (articulated) to a common crankshaft E3 via a connecting rod E2.

The intake device 100 (intake device main body) is a V-type engine in which the direction (X direction) in which a pair of banks B extend parallel to the intake air flow direction (X direction) in the surge tank 2 of the intake device 100 is aligned. It is configured to be attached to E from above. The intake device 100 (intake device main body) is fixed to the V-shaped engine E by a fastening member F from above.

Here, in each drawing, the vertical direction is indicated by the Z direction, the upward direction by the Z1 direction, and the downward direction by the Z2 direction. The Z direction (Z2 direction) is also the direction in which the fastening member F is inserted into the fastening hole 4a of the intake device 100, which will be described later.

Further, in each figure, the axial direction of the crankshaft E3 orthogonal to the Z direction is indicated by the X direction. The X direction is also the flow direction of intake air in the surge tank 2 of the intake device 100 . Of the flow directions of intake air in the surge tank 2, the direction from the upstream side to the downstream side is indicated by the X1 direction, and the opposite direction is indicated by the X2 direction.

In each figure, the direction orthogonal to both the Z direction and the X direction is indicated by the Y direction, one of the Y directions is indicated by the Y1 direction, and the other is indicated by the Y2 direction. The Y direction is also the direction in which the pair of banks B are arranged, and is also the lateral direction of the surge tank 2 in plan view. The X direction is also the longitudinal direction of the surge tank 2 in plan view.

As shown in FIGS. 2 and 3, the intake system 100 includes an intake passage 1, a surge tank 2 which is a space into which intake air flows from the intake passage 1, and a plurality of (6 2) ports 3 and 3.

The intake device 100 also includes a flange 4 provided with a plurality (eight) of fastening holes 4a, an external gas inlet 5 for introducing external gas into the surge tank 2, and a pressure measurement chamber 6 in which a pressure sensor 6a is arranged. It has The external gas is, for example, blow-by gas, EGR (Exhaust Gas Recirculation) gas, or the like.

(Configuration of "intake passage" of intake device)
The intake passage 1 is a portion of the intake device 100 into which intake air first flows. The intake passage 1 is connected to a throttle body (not shown) provided with a throttle valve (not shown) for adjusting the amount of intake air flowing into the engine E. As shown in FIG. The intake passage 1 is configured to supply the surge tank 2 with intake air flowing from the throttle body.

(Construction of the "port" of the intake device)
A plurality of ports 3 are connected to a surge tank 2 and configured to receive intake air from the surge tank 2 . In addition, the plurality of ports 3 are arranged at intervals along the intake flow direction (X direction) in the surge tank 2 .

Specifically, the plurality of ports 3 are arranged in two rows along the intake air flow direction (X direction) in the surge tank 2 (three ports). A plurality of (three) ports 3 in one row (the row on the Y1 direction side) are configured to supply intake air to the bank B on the one side (the Y1 direction side). A plurality of (three) ports 3 in the other row (the row on the Y2 direction side) are configured to supply intake air to the bank B on the other side (the Y2 direction side).

As shown in FIG. 1, the plurality of ports 3 are arranged on one side (Y1 direction side) toward the downstream side (downward side) of the flow of intake air when viewed from the flow direction (X direction) of the intake air in the surge tank 2. ) and the bank B on the other side (Y2 direction side). That is, the plurality of ports 3 are separated from the center line α in the width direction (Y direction) of the intake device 100 as they go downward (Z1 direction) when viewed from the flow direction (X direction) of intake air in the surge tank 2. is configured to

(Configuration of "flange provided with fastening holes" of intake device)
The flange 4 is installed so that the intake device 100 is in surface contact with the cylinder head E11 of the engine E from above.

As shown in FIG. 3, the flange 4 is provided with a plurality (eight) of fastening holes 4a. The flange 4 (fastening hole 4 a ) is provided outside the surge tank 2 . The fastening hole 4a is configured such that a fastening member F for fixing the intake system main body including the intake passage 1, the surge tank 2 and the plurality of ports 3 to the cylinder head E11 of the engine E is inserted. The fastening member F is, for example, a bolt. The fastening hole 4a penetrates the flange 4 in the vertical direction (Z direction).

Here, the fastening member F is fastened to the fastening hole 4a using a predetermined attachment tool (not shown) or the like arranged along the insertion direction (Z direction) of the fastening member F into the fastening hole 4a. Therefore, the air intake device 100 (surge tank 2) is formed in a predetermined shape capable of securing an arrangement space for a predetermined mounting tool so as not to interfere with the predetermined mounting tool.

That is, the intake device 100 (surge tank 2) has a shape that does not overlap with the fastening hole 4a when viewed from the insertion direction (Z direction) of the fastening member F into the fastening hole 4a.

Of the plurality (eight) of fastening holes 4a, half (four) are arranged on the Y1 direction side of the surge tank 2, and the other half (four) are arranged on the Y2 direction side of the surge tank 2. As shown in FIG. The positions of the fastening holes 4a in the half (four) on the Y1 direction side of the surge tank 2 substantially coincide with each other in the Y direction. In addition, the positions of the fastening holes 4a in the half (four) on the Y2 direction side of the surge tank 2 substantially coincide with each other in the Y direction.

Further, the half (four) fastening holes 4a on the Y1 direction side of the surge tank 2 are arranged in a row at substantially constant intervals in the X direction. In addition, the half (four) fastening holes 4a on the Y2 direction side of the surge tank 2 are arranged in a line at substantially constant intervals in the X direction.

(Construction of "surge tank" of air intake system)
The surge tank 2 includes bulging portions 20 and recesses 21 provided between the bulging portions 20 adjacent in the X direction. The surge tank 2 is configured such that when viewed from the side (viewed from the Y direction), the size in the vertical direction gradually decreases toward the downstream side in the intake flow direction (X direction) (see FIG. 2). .

(Structure of concave portion)
The recessed portion 21 is recessed toward the inside of the surge tank 2 . The fastening hole 4a is arranged in the concave portion 21 outside the surge tank 2 when viewed from the insertion direction (Z direction) of the fastening member F into the fastening hole 4a. The surge tank 2 secures an arrangement space for the mounting tool for the fastening member F described above by the recess 21 .

Further, the recesses 21 serve as nodes on the inner surface of the surge tank 2 and are configured to finely divide the inner surface of the surge tank 2 . As a result, the inner surface of the surge tank 2 finely divided by the recesses 21 functions as a relatively small dial ram (vibrating film) during air intake, so that the amplitude of vibration of the inner surface of the surge tank 2 is suppressed. . As a result, the noise generated from the surge tank 2 can be suppressed.

(Structure of swelling portion)
The bulging portion 20 is a portion that bulges outward from the inside of the surge tank 2 . A plurality (six) of the swelling portions 20 are provided corresponding to a plurality (six) of the ports 3 . The bulging portion 20 is a straight line S connecting the adjacent fastening holes 4a when viewed from the direction in which the fastening member F is inserted into the fastening hole 4a (the Z direction). It bulges outward from the inside of the surge tank 2 so as to straddle it. In FIG. 3, a portion of the bulging portion 20 straddling the straight line S and positioned on the outer side of the surge tank 2 is hatched.

As shown in FIG. 4, the bulging portion 20 is formed in an arc shape when viewed from the insertion direction (Z direction) of the fastening member F into the fastening hole 4a. Specifically, the entire inner surface 20a of the swelling portion 20 is formed in an arc shape. The arc-shaped bulging portion 20 corresponding to the most downstream port 3 has the smallest radius R6 among the plurality of arc-shaped bulging portions 20 corresponding to the plurality of ports 3 .

Specifically, the radii of the plurality of arcuate bulging portions 20 corresponding to the plurality of ports 3 are set to radii R1 to R6 in order from the upstream side in the intake air flow direction (X direction) in the surge tank 2. FIG. In this case, radius R6 is smaller than any one of radii R1 to R5. With such a configuration, when the intake air A0 flows along the inner surface 20a of the swelling portion 20 corresponding to the most downstream port 3, the direction of the intake air A0 can be greatly bent. Returning to the upstream side is suppressed, and the intake air A0 can flow toward the most downstream port 3 .

As shown in FIG. 5, the inner surface 20a of the bulging portion 20 is positioned more inwardly of the surge tank 2 toward the downstream side of the surge tank 2 when viewed from the insertion direction (Z direction) of the fastening member F into the fastening hole 4a. In addition, it includes an inclined surface 20b that is inclined so that the flow along the inner surface 20a of the surge tank 2 is directed toward the port 3 on the downstream side of the recess 21. As shown in FIG.

The inner surface 20a (inclined surface 20b) of the bulging portion 20 allows the intake air to flow along the inner surface 20a of the bulging portion 20, thereby allowing the intake air to flow along the inner surface 20a toward the port 3 corresponding to the bulging portion 20. In addition, it is configured to allow intake air to flow toward the port 3 on the downstream side. In short, the inner surface 20a of the bulge 20 directs intake air along the inner surface 20a of the bulge 20, thereby distributing the intake air to a plurality of ports 3 near the bulge 20 along which the intake air flows. It is configured.

More specifically, as shown in FIG. 3, the inner surface 20a of the bulging portion 20 allows the intake air A10 to flow along the inner surface 20a of the bulging portion 20, so that the inner surface 20a of the bulging portion 20 flows. , that is, the port 3 closest to the inner surface 20a of the bulging portion 20 through which the intake air A10 flows.

Further, as shown in FIG. 5, the inner surface 20a (inclined surface 20b) of the bulging portion 20 allows the intake air A1 and A2 to flow along the inner surface 20a of the bulging portion 20, so that the intake air A1 and A2 flow along the inner surface 20a. It is configured to flow the intake air A1 and A2 toward the port 3 on the one downstream side of the port 3 corresponding to the bulging portion 20 through which it flows.

More specifically, the inner surfaces 20a of the bulges 20 are connected to one of the ports 3 corresponding to the bulges 20 of one row by allowing the intake air A1, A2 to flow along the inner surfaces 20a of the bulges 20 of one row. It is configured to flow the intake air A1 and A2 toward the ports 3 in the other row on the downstream side.

Here, in the intake flow direction (X direction) in the surge tank 2, the three swelling portions 20 on the Y1 direction side and the three swelling portions 20 on the Y2 direction side are alternately arranged. As a result, the intake air A1 flowing along the inner surfaces 20a of the three bulging portions 20 on the Y1 direction side and the intake air A2 flowing along the inner surfaces 20a of the three bulging portions 20 on the Y2 direction side are separated in the surge tank 2 as follows: Collision is suppressed, and the occurrence of pressure loss is suppressed.

(Construction of "external gas inlet" and "pressure measurement chamber" of intake device)
The external gas inlet 5 is connected to a swelling portion 20 on the upstream side of the surge tank 2 and configured to introduce external gas into the surge tank 2 . The external gas inlet 5 is configured by, for example, a pipeline connecting the surge tank 2 and the crankcase.

The pressure measurement chamber 6 is provided in a swelling portion 20 different from the swelling portion 20 to which the external gas inlet 5 is connected, among the plurality (six) swelling portions 20 . A pressure sensor 6 a that is connected to the surge tank 2 and measures the pressure inside the surge tank 2 is arranged in the pressure measurement chamber 6 .

Here, the recess 21 is arranged between the external gas inlet 5 and the pressure measuring chamber 6 . As a result, the surge tank 2 is configured so that liquid that has flowed into the surge tank 2 together with the external gas from the external gas inlet 5 does not reach the pressure sensor 6 a arranged in the pressure measurement chamber 6 . As a result, the pressure sensor 6a can measure the pressure in the surge tank 2 in a state in which the liquid content is almost non-adherent.

(Effect of this embodiment)
The following effects can be obtained in this embodiment.

In the present embodiment, as described above, when viewed from the direction of insertion of the fastening member F into the fastening holes 4a, between the adjacent fastening holes 4a is the straight line S that connects the adjacent fastening holes 4a. A surge tank 2 is provided with a bulging part 20 bulging outward from the inside of the surge tank 2 so as to straddle a straight line S in contact with the matching fastening holes 4a. As a result, compared to the conventional configuration in which both the left and right inner side surfaces in the surge tank extend substantially linearly toward the downstream side along the flow direction of the intake air in the surge tank, the surge tank 2 Resistance can be given to the intake air flowing along the direction of flow of the intake air inside. For this reason, compared to the above-described conventional configuration, the amount of intake air flowing into the port 3 on the downstream side is smaller, and the amount of intake air flowing into the port 3 on the upstream side is larger. The inflow amount of intake air can be made uniform. As a result, the performance of distributing the intake air to the plurality of ports 3 of the surge tank 2 can be improved. Also, the tank capacity of the surge tank 2 can be increased by the swelling portion 20 .

In this embodiment, as described above, a plurality of bulging portions 20 are provided corresponding to a plurality of ports 3, and the surge tank 2 is provided between adjacent bulging portions 20, and is located inside the surge tank 2. It includes a recessed portion 21 that is recessed toward. As a result, since the inner surface of the surge tank 2 can be finely partitioned by the recessed portions 21, the amplitude of the inner surface of the surge tank 2 can be reduced by making the recessed portions 21 function as nodes of the inner surface of the surge tank 2 during intake. can be done. As a result, noise caused by vibration of the surge tank 2 can be suppressed.

In the present embodiment, as described above, the inner surface 20a of the bulging portion 20 allows the intake air to flow along the inner surface 20a of the bulging portion 20, so that the port 3 corresponding to the bulging portion 20 through which the intake air flows along the inner surface 20a. It is configured to allow intake air to flow toward the port 3 on the downstream side. This allows the bulging portion 20 to distribute the intake air to at least the port 3 closest to the bulging portion 20 along which the intake air flows along the inner surface 20a and to the downstream port 3, thereby distributing the intake air to a plurality of ports 3. By further improving the uniformity of the intake air, the distribution performance of the intake air can be further improved.

In the present embodiment, as described above, the inner surface 20a of the bulging portion 20 allows the intake air to flow along the inner surface 20a of the bulging portion 20, so that the port 3 corresponding to the bulging portion 20 along which the intake air flows along the inner surface 20a. It is configured to allow the intake air to flow toward the port 3 on the downstream side. Thereby, the bulge 20 allows at least one of the ports 3 closest to the bulge 20 along which the intake air flows along the inner surface 20a and the port 3 corresponding to the bulge 20 along which the intake air flows along the inner surface 20a to be one port downstream. Since the intake air can be distributed to the ports 3, the performance of distributing the intake air to the plurality of ports 3 can be further improved.

In this embodiment, as described above, the plurality of ports 3 are arranged in two rows along the flow direction of the intake air in the surge tank 2, and the inner surface 20a of the bulging portion 20 is located in one row. By flowing the intake air along the inner surface 20a of the bulging portion 20, the intake air is flown toward the port 3 of the other row on the downstream side by one of the ports 3 corresponding to the bulging portion 20 of one row. there is This allows the bulge 20 to distribute the intake air to at least one row of ports 3 closest to the bulge 20 through which the intake air flows along the inner surface 20a and the other row of ports 3 . For this reason, in the plurality of ports 3 arranged in two rows, it is possible to suppress variations in intake air for each row.

In the present embodiment, as described above, the inner surface 20a of the bulging portion 20 is positioned more inwardly of the surge tank 2 toward the downstream side of the surge tank 2 when viewed from the direction in which the fastening member F is inserted into the fastening hole 4a. Also includes an inclined surface 20 b that is inclined so that the flow along the inner surface of the surge tank 2 is directed toward the port 3 on the downstream side of the recess 21 . As a result, the inclined surface 20b regulates the flow of intake air and allows the intake air to flow easily toward the predetermined port 3 on the downstream side of the recess 21. As shown in FIG.

In this embodiment, as described above, the swelling portion 20 is formed in an arc shape when viewed from the direction in which the fastening member F is inserted into the fastening hole 4a. Thus, by causing the intake air to flow along the inner surface 20a of the arc-shaped swelling portion 20, it is possible to suppress the disturbance of the flow of the intake air.

In this embodiment, as described above, a plurality of bulging portions 20 are provided corresponding to the plurality of ports 3, and the arc-shaped bulging portion 20 corresponding to the most downstream port 3 corresponds to the plurality of ports 3. Among the plurality of arcuate bulges 20, the radius R6 of the arcuate bulge 20 is the smallest. As a result, the intake air flows along the inner surface 20a of the arc-shaped bulging portion 20 corresponding to the most downstream port 3 and having the smallest radius R6 of the arc-shaped bulging portion 20. Since the direction of the intake air can be greatly bent at the downstream position, the greatly bent intake air can effectively flow to the most downstream port 3 . As a result, it is possible to suppress the return of the intake air from the most downstream position in the surge tank 2 to the upstream side.

In this embodiment, as described above, the external gas inlet 5 that is connected to the bulging portion 20 on the upstream side of the surge tank 2 and introduces the external gas into the surge tank 2 is connected to the surge tank 2, and the surge tank The recess 21 is arranged between the external gas inlet 5 and the pressure measurement chamber 6 , in which a pressure sensor 6 a is arranged to measure the pressure in the chamber 6 . As a result, the recess 21 can separate the external gas inlet 5 and the pressure measurement chamber 6 , thereby suppressing the liquid component that has flowed in from the external gas inlet 5 together with the external gas from reaching the pressure measurement chamber 6 . be able to. As a result, the pressure in the surge tank 2 can be measured by the pressure sensor 6a in a state where the pressure sensor 6a is substantially free of liquid.

In this embodiment, as described above, the main body of the intake system is attached from above to the V-type engine E in which the direction in which the pair of banks B extend parallel to the direction of flow of intake air in the surge tank 2 is the same. is configured as As a result, the intake air distribution performance can be improved in the intake device 100 attached to the V-type engine E in which the direction in which the pair of banks B extend parallel to the flow direction of the intake air in the surge tank 2 coincides. .

[Modification]
The embodiments disclosed this time should be considered illustrative and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the scope and meaning equivalent to the scope of the claims.

For example, in the above embodiment, an example in which the entire inner surface of the swelling portion is formed in a (circular) arc shape has been shown, but the present invention is not limited to this. In the present invention, a flat surface 220a extending in the X direction may be provided on a portion of the inner surface of the bulging portion 220 as in the intake device 200 of the first modified example shown in FIG. In addition, like an air intake device 300 of a second modified example shown in FIG. 7, a flat surface 320a that is inclined with respect to the X direction may be provided on a part of the inner surface of the bulging portion 320 .

Further, in the above embodiment, an example in which six ports are provided in the intake device has been shown, but the present invention is not limited to this. In the present invention, the intake device may be provided with a plurality of ports other than six.

Further, in the above embodiment, an example in which the intake device is attached to the V-type engine has been shown, but the present invention is not limited to this. The present invention may be mounted on other types of engines than V-type engines, such as engines inline with the intake system.

Also, in the above-described embodiment, an example in which the number of ports and the number of swelling portions are the same has been shown, but the present invention is not limited to this. In the present invention, the number of ports and the number of bulges may be different.

Further, in the above-described embodiment, an example in which the bulging portion is provided at the position corresponding to the port has been shown, but the present invention is not limited to this. In the present invention, it is not necessary to provide a bulging portion at a position corresponding to the port.

REFERENCE SIGNS LIST 1 intake passage 2 surge tank 3 port 4a fastening hole (of flange) 5 external gas inlet 6 pressure measurement chamber 6a pressure sensor 20, 220, 320 bulge (of surge tank) 20a, 220a, 320a inner surface (of bulge) 20b Inclined surface (bulge portion) 21 Concave portion (surge tank) 100, 200, 300 Intake device B Bank E Engine E11 Cylinder head F Fastening member R6 Radius S Straight line

Claims (9)

an intake passageway;
a surge tank, which is a space into which intake air flows from the intake passage;
a plurality of ports connected to the surge tank, into which intake air flows from the surge tank, and which are arranged at intervals along a flow direction of the intake air in the surge tank;
a plurality of fastening holes into which a fastening member for fixing an intake device main body including the intake passage, the surge tank and the plurality of ports to the cylinder head of the engine is inserted;
The surge tank is a straight line connecting the adjacent fastening holes between the adjacent fastening holes when viewed from the direction in which the fastening member is inserted into the fastening holes, and is in contact with the adjacent fastening holes from the port side. An air intake device including a bulging portion that bulges outward from the inside of the surge tank so as to straddle the straight line. A plurality of the bulging portions are provided corresponding to the plurality of ports,
2. The intake system according to claim 1, wherein said surge tank includes a concave portion provided between said adjacent bulging portions and recessed toward the inside of said surge tank. By allowing intake air to flow along the inner surface of the bulging portion, the inner surface of the bulging portion allows the intake air to flow along the inner surface toward the port corresponding to the bulging portion along the inner surface of the bulging portion. 3. The intake device of claim 2, configured to channel intake air towards a port. The inner surface of the bulging portion directs the intake air along the inner surface of the bulging portion so that the intake air flows along the inner surface toward the port one downstream side of the port corresponding to the bulging portion. 4. The intake system of claim 3, wherein the air intake system is configured to flow a The plurality of ports are arranged in two rows along the flow direction of intake air in the surge tank,
The inner surface of the bulging portion is configured to flow the intake air along the inner surface of the bulging portion of one row so that the other row of the ports corresponding to the bulging portion of the one row is one downstream side. 5. The intake device of claim 4, configured to direct intake air towards the port. The inner surface of the bulging portion is positioned more inwardly of the surge tank toward the downstream side of the surge tank when viewed from the direction in which the fastening member is inserted into the fastening hole, and the flow along the inner surface of the surge tank increases. The intake device according to any one of claims 3 to 5, comprising an inclined surface inclined toward the port on the downstream side of the recess. The air intake device according to any one of claims 1 to 6, wherein said bulging portion is formed in an arc shape when viewed from the direction in which said fastening member is inserted into said fastening hole. A plurality of the bulging portions are provided corresponding to the plurality of ports,
8. The arc-shaped bulging portion according to claim 7, wherein the arc-shaped bulging portion corresponding to the most downstream port has the smallest radius among the plurality of arc-shaped bulging portions corresponding to the plurality of ports. suction device. an external gas inlet connected to the bulging portion on the upstream side of the surge tank for introducing external gas into the surge tank;
a pressure measurement chamber connected to the surge tank and in which a pressure sensor for measuring the pressure in the surge tank is arranged;
The intake device according to any one of claims 2 to 6, wherein the recess is arranged between the external gas inlet and the pressure measurement chamber.

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