Intake system

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

[Technical Field]

[0001] The present invention relates to an intake system, and more particularly to an intake system having multiple ports. [Background technology]

[0002] BACKGROUND ART Conventionally, an intake device having a plurality of ports is known (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses an intake device including an intake passage, a surge tank into which intake air flows from the intake passage, and multiple 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 above-mentioned surge tank, both left and right inner surfaces extend substantially linearly downstream in a plan view along the flow direction of the intake air within the surge tank. The above-mentioned multiple ports are arranged in a line from upstream to downstream along the flow direction of the intake air within the surge tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] US Patent Application Publication No. 2011 / 0253080 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the intake system described in Patent Document 1, the left and right inner surfaces of the surge tank extend in a substantially straight line downstream in the direction of intake air flow within the surge tank in a plan view, meaning that the intake air flowing near the left and right inner surfaces of the surge tank encounters almost no resistance from the left and right inner surfaces and is therefore more likely to flow toward the downstream port. As a result, the amount of intake air flowing into the downstream port tends to be relatively large, which creates the problem of poor intake air distribution performance of the surge tank.

[0006] This invention has been made to solve the above-mentioned problems, and one object of this invention is to provide an intake device that can improve the distribution performance of intake air to multiple ports of a surge tank. [Means for solving the problem]

[0007] In order to achieve the above object, an intake device according to one aspect of the present invention comprises an intake passage, 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 and into which intake air flows from the surge tank and which are arranged at intervals along the flow direction of the intake air within the surge tank, and a plurality of fastening holes into which fastening members are inserted to fix an intake device body including the intake passage, the surge tank and the plurality of ports to a cylinder head of an engine, and the surge tank includes a bulge portion which bulges outward from the inside of the surge tank so as to straddle a straight line connecting adjacent fastening holes and tangent to adjacent fastening holes from the port side, between adjacent fastening holes when viewed from the direction in which the fastening members are inserted into the fastening holes. A plurality of bulging portions are provided corresponding to a plurality of ports, and the surge tank is provided between adjacent bulging portions and includes a recessed portion recessed toward the inside of the surge tank, and the inner surface of the bulging portion is configured to flow the intake air along the inner surface of the bulging portion, thereby flowing the intake air toward the port corresponding to the bulging portion along which the intake air flows, and also flow the intake air toward the downstream port. .

[0008] In one aspect of the intake system of the present invention, as described above, the surge tank is provided with a bulge extending from the inside to the outside of the surge tank, spanning a line connecting adjacent fastening holes and tangent to the adjacent fastening holes from the port side, as viewed from the direction in which fastening members are inserted into the fastening holes. This allows the bulge to provide resistance to the intake air flowing in the intake air flow direction within the surge tank, compared to a conventional configuration in which both left and right inner surfaces of the surge tank extend substantially linearly downstream along the intake air flow direction within the surge tank. Therefore, compared to the conventional configuration, the intake air inflow rate to the downstream port is reduced and the intake air inflow rate to the upstream port is increased, thereby achieving uniform intake air inflow rates to all ports. As a result, the intake air distribution performance to the multiple ports of the surge tank can be improved. The bulge also allows the surge tank's tank capacity to be increased. The surge tank includes a plurality of bulges corresponding to the plurality of ports, and the surge tank includes recesses between adjacent bulges that are recessed inward of the surge tank. The recesses allow the inner surface of the surge tank to be divided into smaller sections, allowing the recesses to function as nodes on the inner surface of the surge tank during intake, thereby reducing the amplitude of the inner surface of the surge tank. As a result, noise caused by vibration of the surge tank can be suppressed. The inner surface of the bulge is configured to direct intake air along the inner surface of the bulge, thereby directing the intake air toward the port corresponding to the bulge along which the intake air flows, and toward the downstream port. The bulge distributes the intake air to at least the port closest to the bulge along which the intake air flows and the downstream port, thereby further improving the uniformity of distribution to the plurality of ports and further improving intake air distribution performance.

[0013] In the configuration in which intake air is caused to flow along the inner surface of the bulge portion toward a downstream port, the inner surface of the bulge portion is preferably configured to cause intake air to flow along the inner surface of the bulge portion toward a port one downstream of the port corresponding to the bulge portion along whose inner surface the intake air flows.

[0014] With this configuration, the bulge portion can distribute the intake air to at least the port closest to the bulge portion through which the intake air flows along the inner surface and the port one port downstream of the port corresponding to the bulge portion through which the intake air flows along the inner surface, thereby further improving the distribution performance of the intake air to multiple ports.

[0015] In a configuration in which the intake air is caused to flow along the inner surface of the bulge portion, thereby causing the intake air to flow toward a port one row downstream of the port corresponding to the bulge portion along whose inner surface the intake air flows, preferably, the ports are arranged in two rows along the flow direction of the intake air in the surge tank, and the inner surface of the bulge portion is configured so that the intake air is caused to flow along the inner surface of the bulge portion in one row, causing the intake air to flow toward a port in the other row one row downstream of the port corresponding to the bulge portion in one row.

[0016] With this configuration, the bulge can distribute the intake air to at least the ports in one row closest to the bulge, where the intake air flows along the inner surface, and the ports in the other row, thereby reducing variations in the intake air flow between the rows of ports arranged in two rows.

[0017] In a configuration in which intake air is caused to flow along the inner surface of the bulge toward the downstream port, the inner surface of the bulge preferably includes an inclined surface that is positioned more inward of the surge tank as it moves downstream of the surge tank, when viewed from the direction in which the fastening member is inserted into the fastening hole, and that is inclined so that the flow along the inner surface of the surge tank is directed toward the port downstream of the recess.

[0018] With this configuration, the inclined surface regulates the flow of intake air, making it possible to easily direct the intake air toward a predetermined port downstream of the recess.

[0019] In the intake system according to the aforementioned aspect, the bulge portion is preferably formed in an arc shape when viewed from the direction in which the fastening member is inserted into the fastening hole.

[0020] With this configuration, the intake air is made to flow along the inner surface of the arc-shaped bulge, thereby making it possible to prevent the intake air flow from being disturbed.

[0021] In this case, preferably, a plurality of bulges are provided corresponding to a plurality of ports, and the arc-shaped bulge corresponding to the most downstream port has the smallest radius of the arc-shaped bulge among the plurality of arc-shaped bulges corresponding to the plurality of ports.

[0022] With this configuration, the intake air is directed along the inner surface of the arc-shaped bulge that corresponds to the most downstream port and has the smallest radius, which allows the intake air to bend significantly at the most downstream position within the surge tank, effectively directing the bent intake air to the most downstream port. As a result, the intake air is prevented from returning upstream from the most downstream position within the surge tank.

[0023] In a configuration in which the bulge includes a recess, the configuration preferably further comprises an external gas inlet connected to the bulge upstream of the surge tank for introducing external gas into the surge tank, and a pressure measurement chamber connected to the surge tank and in which a pressure sensor for measuring the pressure inside the surge tank is disposed, and the recess is disposed between the external gas inlet and the pressure measurement chamber.

[0024] With this configuration, the recess can separate the external gas inlet from the pressure measurement chamber, preventing liquid that flows in with the external gas from the external gas inlet from reaching the pressure measurement chamber, allowing the pressure sensor to measure the pressure inside the surge tank with almost no liquid adhering to the pressure sensor.

[0025] In the intake device according to the above aspect, the following configuration is also possible.

[0026] (Additional note 1) That is, in the intake device according to the above aspect, the intake device main body is configured to be attached from above to a V-shaped engine in which the direction in which a pair of banks extend parallel to the flow direction of the intake air in the surge tank is the same.

[0027] This configuration improves the intake distribution performance in an intake device attached to a V-type engine in which the direction in which a pair of banks extend parallel to the flow direction of the intake air in the surge tank is the same. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a front view showing a state in which an intake device according to an embodiment is installed in an engine. [Figure 2] FIG. 2 is a side view of the intake device according to the embodiment. [Figure 3] 3 is a cross-sectional view taken along the line 90-90 shown in FIG. 2, illustrating the degree of expansion of the expansion portion of the intake device. FIG. [Figure 4] 3 is a cross-sectional view taken along the line 90-90 shown in FIG. 2, illustrating the radius of the arcuate bulge of the intake device. FIG. [Figure 5] FIG. 3 is a cross-sectional view taken along the line 90-90 shown in FIG. 2, illustrating the flow of intake air in the intake device. [Figure 6] FIG. 10 is a diagram for explaining a bulge portion of the intake device of the first modified example. [Figure 7] FIG. 10 is a diagram for explaining a bulge portion of an intake device according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, an embodiment will be described with reference to the drawings.

[0030] [Embodiment] The configuration of an intake device 100 according to an embodiment will be described with reference to FIGS.

[0031] The intake system 100 shown in FIG. 1 is configured to distribute intake air to an engine E. The engine E is, for example, an engine for a vehicle (automobile). The engine E is a multi-cylinder V-type engine having a pair of banks B. Specifically, the engine E is a six-cylinder V-type engine in which three cylinders E1 (only one is shown in FIG. 1) are provided in one bank B. Pistons E10 of each cylinder E1 arranged in a V shape are connected (linked) to a common crankshaft E3 via connecting rods E2.

[0032] The intake device 100 (intake device main body) is configured to be attached from above to a V-type engine E in which the direction in which a pair of banks B extend parallel (X direction) coincides with the intake air flow direction (X direction) in a surge tank 2 of the intake device 100. The intake device 100 (intake device main body) is fixed to the V-type engine E from above by fastening members F.

[0033] In each drawing, the vertical direction is indicated by the Z direction, the upper side is indicated by the Z1 direction, and the lower side is indicated by the Z2 direction. The Z direction (Z2 direction) is also the insertion direction of a fastening member F into a fastening hole 4a (described later) of the intake device 100.

[0034] In each figure, the axial direction of the crankshaft E3, which is perpendicular to the Z direction, is indicated as the X direction. The X direction is also the flow direction of the intake air in the surge tank 2 of the intake device 100. The flow direction of the intake air in the surge tank 2 from the upstream side to the downstream side is indicated as the X1 direction, and the opposite direction is indicated as the X2 direction.

[0035] In each figure, the direction perpendicular to both the Z and X directions is indicated as the Y direction, with one of the Y directions indicated as the Y1 direction and the other as the Y2 direction. The Y direction is also the arrangement direction of the pair of banks B and the short-side direction of the surge tank 2 in a plan view. The X direction is also the long-side direction of the surge tank 2 in a plan view.

[0036] As shown in Figures 2 and 3, the intake device 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 multiple (six) ports 3 which distribute the intake air of the surge tank 2 to the engine E.

[0037] The intake system 100 also includes a flange 4 having a plurality of (eight) 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 disposed. The external gas may be, for example, blow-by gas or EGR (Exhaust Gas Recirculation) gas.

[0038] (Configuration of the intake passage of the intake system) The intake passage 1 is the portion into which intake air first flows in the intake device 100. The intake passage 1 is connected to a throttle body (not shown) provided with a throttle valve (not shown) that adjusts the amount of intake air that flows into the engine E. The intake passage 1 is configured to supply the intake air that flows in from the throttle body to a surge tank 2.

[0039] (Configuration of "ports" in the intake system) The multiple ports 3 are connected to the surge tank 2 and configured to allow intake air to flow in from the surge tank 2. The multiple ports 3 are also arranged at intervals along the intake air flow direction (X direction) within the surge tank 2.

[0040] Specifically, the multiple ports 3 are arranged in two rows, each consisting of three ports, along the intake air flow direction (X direction) within the surge tank 2. The multiple ports 3 (three ports) in one row (the row on the Y1 direction side) are configured to supply intake air to the bank B on one side (the Y1 direction side). The multiple ports 3 (three ports) 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).

[0041] 1, the multiple ports 3 are configured so that they approach the bank B on one side (Y1 direction side) and the bank B on the other side (Y2 direction side) as they move downstream (downward) of the intake air flow when viewed from the flow direction (X direction) of the intake air inside the surge tank 2. In other words, the multiple ports 3 are configured so that they move farther away from the center line α in the width direction (Y direction) of the intake device 100 as they move downward (Z1 direction) when viewed from the flow direction (X direction) of the intake air inside the surge tank 2.

[0042] (Configuration of the "flange with fastening holes" in the intake system) 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.

[0043] As shown in Fig. 3, the flange 4 is provided with a plurality of (eight) fastening holes 4a. The flange 4 (fastening holes 4a) are provided on the outside of the surge tank 2. The fastening holes 4a are configured to receive fastening members F that secure the intake device 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. The fastening members F are, for example, bolts. The fastening holes 4a penetrate the flange 4 in the vertical direction (Z direction).

[0044] Here, the fastening member F is fastened to the fastening hole 4a using a predetermined installation tool (not shown) or the like that is arranged along the insertion direction (Z direction) of the fastening member F into the fastening hole 4a. Therefore, the intake device 100 (surge tank 2) is formed in a predetermined shape that can ensure a space for arranging the predetermined installation tool so as not to interfere with the predetermined installation tool.

[0045] 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.

[0046] Of the multiple (eight) fastening holes 4a, half (four) are positioned on the Y1 direction side of the surge tank 2, and the remaining half (four) are positioned on the Y2 direction side of the surge tank 2. The positions of the half (four) fastening holes 4a on the Y1 direction side of the surge tank 2 are approximately aligned with each other in the Y direction. Also, the positions of the half (four) fastening holes 4a on the Y2 direction side of the surge tank 2 are approximately aligned with each other in the Y direction.

[0047] Furthermore, the fastening holes 4a of the surge tank 2 on the Y1 side (four holes) are arranged in a row at approximately regular intervals in the X direction. Also, the fastening holes 4a of the surge tank 2 on the Y2 side (four holes) are arranged in a row at approximately regular intervals in the X direction.

[0048] (Configuration of the "surge tank" in the intake system) The surge tank 2 includes bulges 20 and recesses 21 provided between adjacent bulges 20 in the X direction. The surge tank 2 is configured so that, in a side view (viewed from the Y direction), its vertical size gradually decreases toward the downstream side in the intake air flow direction (X direction) (see FIG. 2).

[0049] (Configuration of recess) The recess 21 is recessed inward of the surge tank 2. The fastening holes 4a are arranged in the recess 21 when viewed from the insertion direction (Z direction) of the fastening members F into the fastening holes 4a outside the surge tank 2. The recess 21 ensures that the surge tank 2 has space for arranging the installation tool for the fastening members F described above.

[0050] Furthermore, the recesses 21 are configured to form nodes on the inner surface of the surge tank 2, finely dividing the inner surface of the surge tank 2. As a result, during intake, the inner surface of the surge tank 2, which is finely divided by the recesses 21, functions as a relatively small dial ram (vibrating membrane), thereby suppressing the amplitude of vibrations on the inner surface of the surge tank 2. As a result, it is possible to suppress the noise generated from the surge tank 2.

[0051] (Configuration of the bulging part) The bulging portion 20 is a portion that bulges outward from the inside of the surge tank 2. A plurality (six) of the bulging portions 20 are provided corresponding to the plurality (six) of ports 3. When viewed from the insertion direction (Z direction) of the fastening members F into the fastening holes 4a, the bulging portion 20 is a straight line S connecting adjacent fastening holes 4a, and bulges outward from the inside of the surge tank 2 so as to straddle the straight line S that is tangent to the adjacent fastening holes 4a from the port 3 side. Note that in FIG. 3, the portion of the bulging portion 20 that straddles the straight line S and is located on the outer side of the surge tank 2 is hatched.

[0052] 4, the bulge 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 bulge 20 is formed in an arc shape. Note that the arc-shaped bulge 20 corresponding to the most downstream port 3 has the smallest radius R6 of the arc-shaped bulge 20 among the multiple arc-shaped bulges 20 corresponding to the multiple ports 3.

[0053] Specifically, the radii of the multiple arc-shaped bulges 20 corresponding to the multiple ports 3 are designated as R1 to R6, in order from the upstream side in the intake air flow direction (X direction) within the surge tank 2. In this case, radius R6 is smaller than any of radii R1 to R5. With this configuration, the direction of the intake air A0 can be significantly bent when the intake air A0 flows along the inner surface 20a of the bulge 20 corresponding to the most downstream port 3, thereby preventing the intake air A0 from returning to the upstream side within the surge tank 2 and enabling the intake air A0 to flow toward the most downstream port 3.

[0054] As shown in Figure 5, the inner surface 20a of the bulge portion 20 includes an inclined surface 20b that is positioned more inward of the surge tank 2 as it moves downstream of the surge tank 2 when viewed from the insertion direction (Z direction) of the fastening member F into the fastening hole 4a, and that is inclined so that the flow along the inner surface 20a of the surge tank 2 moves toward the port 3 downstream of the recess 21.

[0055] The inner surface 20a (inclined surface 20b) of the bulging portion 20 is configured to flow the intake air along the inner surface 20a of the bulging portion 20, thereby causing the intake air to flow toward the port 3 corresponding to the bulging portion 20 through which the intake air flows along the inner surface 20a, and also causing the intake air to flow toward the downstream port 3. In short, the inner surface 20a of the bulging portion 20 is configured to distribute the intake air to multiple ports 3 near the bulging portion 20 through which the intake air flows along the inner surface 20a, by causing the intake air to flow along the inner surface 20a of the bulging portion 20.

[0056] In detail, as shown in FIG. 3, the inner surface 20a of the bulge 20 is configured to flow the intake air A10 along the inner surface 20a of the bulge 20, so that the intake air A10 flows toward the port 3 corresponding to the inner surface 20a of the bulge 20 along which the intake air A10 flows, i.e., the port 3 closest to the inner surface 20a of the bulge 20 through which the intake air A10 flows.

[0057] Also, as shown in Figure 5, the inner surface 20a (inclined surface 20b) of the bulge portion 20 is configured to flow the intake air A1, A2 along the inner surface 20a of the bulge portion 20, so that the intake air A1, A2 flows toward the port 3 one downstream of the port 3 corresponding to the bulge portion 20 through which the intake air A1, A2 flows along the inner surface 20a.

[0058] More specifically, the inner surface 20a of the bulge portion 20 is configured to flow the intake air A1, A2 along the inner surface 20a of the bulge portion 20 in one row, thereby causing the intake air A1, A2 to flow toward the port 3 in the other row that is one row downstream of the port 3 corresponding to the bulge portion 20 in one row.

[0059] Here, the three bulges 20 on the Y1 direction side and the three bulges 20 on the Y2 direction side are arranged alternately in the intake air flow direction (X direction) inside the surge tank 2. This prevents the intake air A1 flowing along the inner surfaces 20a of the three bulges 20 on the Y1 direction side and the intake air A2 flowing along the inner surfaces 20a of the three bulges 20 on the Y2 direction side from colliding with each other inside the surge tank 2, thereby suppressing the occurrence of pressure loss.

[0060] (Configuration of the "external gas inlet" and "pressure measurement chamber" of the intake device) The external gas inlet 5 is connected to the bulge 20 on the upstream side of the surge tank 2, and is configured to introduce external gas into the surge tank 2. The external gas inlet 5 is configured, for example, by a pipe connecting the surge tank 2 and the crankcase.

[0061] The pressure measurement chamber 6 is provided in one of the multiple (six) bulging portions 20 that is different from the bulging portion 20 to which the external gas inlet 5 is connected. The pressure measurement chamber 6 is provided with a pressure sensor 6a that is connected to the surge tank 2 and measures the pressure inside the surge tank 2.

[0062] Here, the recess 21 is disposed between the external gas inlet 5 and the pressure measurement chamber 6. This prevents the liquid that flows into the surge tank 2 from the external gas inlet 5 together with the external gas from reaching the pressure sensor 6a disposed in the pressure measurement chamber 6. As a result, the pressure sensor 6a can measure the pressure inside the surge tank 2 in a state where almost no liquid adheres to it.

[0063] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0064] In this embodiment, as described above, the surge tank 2 is provided with a bulge 20 that bulges from the inside to the outside of the surge tank 2 so as to straddle the line S connecting adjacent fastening holes 4a between adjacent fastening holes 4a, as viewed from the insertion direction of the fastening members F into the fastening holes 4a, which is the line S that connects adjacent fastening holes 4a and is tangent to the adjacent fastening holes 4a from the port 3 side. This allows the bulge 20 to provide resistance to the intake air flowing in the intake air flow direction within the surge tank 2, compared to a conventional configuration in which both left and right inner surfaces of the surge tank extend in a substantially linear fashion downstream along the intake air flow direction within the surge tank 2. Therefore, compared to the conventional configuration, the amount of intake air flowing into the downstream port 3 is reduced and the amount of intake air flowing into the upstream port 3 is increased, thereby achieving uniformity of the intake air flow into all ports 3. As a result, the surge tank 2 can improve its ability to distribute intake air to the multiple ports 3. The bulge 20 also allows the surge tank 2 to have an increased tank capacity.

[0065] In this embodiment, as described above, a plurality of bulges 20 are provided corresponding to the plurality of ports 3, and the surge tank 2 includes recesses 21 that are provided between adjacent bulges 20 and recessed inward of the surge tank 2. This allows the inner surface of the surge tank 2 to be divided into smaller sections by the recesses 21, which can function as nodes on the inner surface of the surge tank 2 during intake, reducing the amplitude of vibration on the inner surface of the surge tank 2. As a result, noise caused by vibration of the surge tank 2 can be suppressed.

[0066] In this embodiment, as described above, the inner surface 20a of the bulging portion 20 is configured to cause the intake air to flow along the inner surface 20a of the bulging portion 20, thereby causing the intake air to flow along the inner surface 20a toward the port 3 corresponding to the bulging portion 20 through which the intake air flows, and also toward the downstream port 3. This allows the bulging portion 20 to distribute the intake air to at least the port 3 closest to the bulging portion 20 through which the intake air flows along the inner surface 20a, and the downstream port 3, thereby further improving the uniformity of distribution to the multiple ports 3 and further improving the intake air distribution performance.

[0067] In this embodiment, as described above, the inner surface 20a of the bulging portion 20 is configured to cause the intake air to flow along the inner surface 20a of the bulging portion 20, thereby causing the intake air to flow toward the port 3 that is one port downstream of the port 3 that corresponds to the bulging portion 20 through which the intake air flows along the inner surface 20a. This allows the bulging portion 20 to distribute the intake air to at least the port 3 closest to the bulging portion 20 through which the intake air flows along the inner surface 20a and the port 3 that is one port downstream of the port 3 that corresponds to the bulging portion 20 through which the intake air flows along the inner surface 20a, thereby further improving the performance of distributing the intake air to the multiple ports 3.

[0068] In this embodiment, as described above, the multiple ports 3 are arranged in two rows along the flow direction of the intake air inside the surge tank 2, and the inner surface 20a of the bulging portion 20 is configured to direct the intake air along the inner surface 20a of the bulging portion 20 in one row, thereby directing the intake air toward the ports 3 in the other row that are one row downstream of the ports 3 corresponding to the bulging portion 20 in one row. This allows the bulging portion 20 to distribute the intake air at least to the ports 3 in one row that are closest to the bulging portion 20 through which the intake air flows along the inner surface 20a, and the ports 3 in the other row. Therefore, for the multiple ports 3 arranged in two rows, variation in the intake air for each row can be suppressed.

[0069] In this embodiment, as described above, the inner surface 20a of the bulge 20 includes an inclined surface 20b that is positioned more inward of the surge tank 2 as it moves downstream of the surge tank 2 when viewed from the insertion direction of the fastening member F into the fastening hole 4a, and that is inclined so that the flow along the inner surface of the surge tank 2 is directed toward the port 3 downstream of the recess 21. This allows the inclined surface 20b to regulate the flow of intake air, making it possible for the intake air to easily flow toward the specified port 3 downstream of the recess 21.

[0070] In this embodiment, as described above, the bulge 20 is formed in an arc shape when viewed from the insertion direction of the fastening member F into the fastening hole 4a. This allows the intake air to flow along the inner surface 20a of the arc-shaped bulge 20, thereby preventing the intake air flow from being disturbed.

[0071] In this embodiment, as described above, a plurality of bulges 20 are provided corresponding to the plurality of ports 3, and the arc-shaped bulge 20 corresponding to the most downstream port 3 has the smallest radius R6 of the arc-shaped bulge 20 among the plurality of arc-shaped bulges 20 corresponding to the plurality of ports 3. As a result, by causing the intake air to flow along the inner surface 20a of the arc-shaped bulge 20 corresponding to the most downstream port 3, which has the smallest radius R6, the direction of the intake air can be greatly bent at the most downstream position within the surge tank 2, and the greatly bent intake air can be effectively flowed to the most downstream port 3. As a result, it is possible to prevent the intake air from returning upstream from the most downstream position within the surge tank 2.

[0072] As described above, this embodiment further includes the external gas inlet 5, which is connected to the bulging portion 20 on the upstream side of the surge tank 2 and introduces external gas into the surge tank 2, and the pressure measurement chamber 6, which is connected to the surge tank 2 and in which a pressure sensor 6a is disposed to measure the pressure inside the surge tank 2, and the recess 21 is disposed between the external gas inlet 5 and the pressure measurement chamber 6. This makes it possible to separate the external gas inlet 5 and the pressure measurement chamber 6 by the recess 21, thereby preventing liquid that has flowed in together with the external gas from the external gas inlet 5 from reaching the pressure measurement chamber 6. As a result, the pressure inside the surge tank 2 can be measured by the pressure sensor 6a in a state in which almost no liquid adheres to the pressure sensor 6a.

[0073] In this embodiment, as described above, the intake device main body is configured to be attached from above to a V-type engine E in which the direction in which the pair of banks B extend parallel to the direction of the intake air flow in the surge tank 2 is the same. This makes it possible to improve the intake air distribution performance in the intake device 100 attached to a V-type engine E in which the direction in which the pair of banks B extend parallel to the direction in which the intake air flow in the surge tank 2 is the same.

[0074] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0075] For example, in the above embodiment, an example was shown in which the entire inner surface of the bulge portion was formed in an arc shape, but the present invention is not limited to this. In the present invention, as in intake device 200 of a first modified example shown in Fig. 6, a flat surface 220a extending in the X direction may be provided on part of the inner surface of bulge portion 220. Alternatively, as in intake device 300 of a second modified example shown in Fig. 7, a flat surface 320a inclined with respect to the X direction may be provided on part of the inner surface of bulge portion 320.

[0076] Furthermore, in the above embodiment, an example in which six ports are provided in the intake device is shown, but the present invention is not limited to this. In the present invention, the intake device may be provided with a number of ports other than six.

[0077] In addition, although the above embodiment shows an example in which the intake device is attached to a V-type engine, the present invention is not limited to this. In the present invention, the intake device may be attached to an engine of a type other than a V-type engine, such as an in-line engine.

[0078] In addition, although the above embodiment shows an example in which the number of ports and the number of bulging portions are the same, the present invention is not limited to this and may have a different number of ports and bulging portions.

[0079] In addition, in the above embodiment, an example was shown in which the bulge portion was provided at a position corresponding to the port, but the present invention is not limited to this. In the present invention, the bulge portion does not have to be provided at a position corresponding to the port. [Explanation of symbols]

[0080] 1 Intake passage 2 surge tank 3 ports 4a (Flange) fastening hole 5 External gas inlet 6. Pressure measurement chamber 6a Pressure sensor 20, 220, 320 (Surge tank) bulge 20a, 220a, 320a (inner surface of bulge) 20b (bulge) inclined surface 21 (Surge tank) recess 100, 200, 300 intake system Bank B E-Engine E11 cylinder head F Fastening member R6 radius S straight line

Claims

1. An intake passage; 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 spaced apart along the flow direction of the intake air within the surge tank; a plurality of fastening holes into which fastening members are inserted to fix an intake device main body including the intake passage, the surge tank, and the plurality of ports to a cylinder head of an engine, the surge tank includes a bulging portion that bulges from the inside to the outside of the surge tank so as to straddle a straight line connecting the adjacent fastening holes when viewed from the insertion direction of the fastening members into the fastening holes and tangent to the adjacent fastening holes from the port side, a plurality of the bulging portions are provided corresponding to the plurality of ports, the surge tank includes a recess provided between adjacent bulges and recessed inward of the surge tank, An intake device wherein the inner surface of the bulge portion is configured to flow intake air along the inner surface of the bulge portion, thereby flowing the intake air toward the port corresponding to the bulge portion through which the intake air flows along the inner surface, and also flowing the intake air toward the port downstream.

2. 2. The intake device of claim 1, wherein the inner surface of the bulge portion is configured to cause intake air to flow along the inner surface of the bulge portion, thereby causing the intake air to flow toward the port that is one port downstream of the port corresponding to the bulge portion through which the intake air flows along the inner surface.

3. The plurality of ports are arranged in two rows along the flow direction of the intake air in the surge tank, 3. The intake device of claim 2, wherein the inner surface of the bulge portion is configured to direct the intake air along the inner surface of the bulge portion in one row, thereby directing the intake air toward the port in the other row that is one row downstream of the port corresponding to the bulge portion in the one row.

4. An intake device as described in any one of claims 1 to 3, wherein the inner surface of the bulge portion, when viewed from the insertion direction of the fastening member into the fastening hole, is positioned more inward of the surge tank as it moves downstream of the surge tank and includes an inclined surface that slopes so that the flow along the inner surface of the surge tank moves toward the port downstream of the recess.

5. 5. The intake device according to claim 1, wherein the bulge is formed in an arc shape when viewed from the direction in which the fastening member is inserted into the fastening hole.

6. a plurality of the bulging portions are provided corresponding to the plurality of ports, 6. The intake device of claim 5, wherein the arc-shaped bulge portion corresponding to the most downstream port has the smallest radius among the plurality of arc-shaped bulges corresponding to the plurality of ports.

7. an external gas inlet connected to the bulging portion upstream of the surge tank and configured to introduce 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 inside the surge tank is disposed, 5. The intake device according to claim 1, wherein the recess is disposed between the external gas inlet and the pressure measuring chamber.

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