Engine intake system

Abstract

To provide an intake system for engines, the intake system being easy to manufacture by joining plural members and provided with an intake manifold having independent intake pipes that are same in a duct length even under adaption of a layout where a part of the independent intake pipes is bent in a direction of the engine's cylinder row.SOLUTION: An intake manifold 10 has four independent intake pipes. Each of the four independent intake pipes has an arc shape part so as to surround outside of an intake pipe 10a with a space in its radial direction. One independent intake pipe is formed in a curve in a cylinder row direction from an intake opening 100a toward a lead-out opening 100e, and the curved part of the independent intake pipe is formed by joining a member 100 and a member 101. The curved parts of the remaining independent intake pipes are formed so as to depart from the intake pipe 10a far away, the curved parts are formed by joining a member 103 and a member 101.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an intake system for an engine, and more particularly to the structure of an intake manifold. [Background technology]

[0002] In vehicles such as automobiles, an intake manifold is attached to the engine. Patent Document 1 discloses an intake manifold attached to a four-cylinder engine.

[0003] The intake manifold in Patent Document 1 is integrally formed with an intake pipe extending along the cylinder row direction of the engine, a surge tank connected to one end of the intake pipe, and a plurality of independent intake pipes, each connected to the surge tank at one end and connected to an intake port of the engine at the other end. Each of the independent intake pipes is configured in an arc shape so as to surround the radially outer side of the intake pipe opposite the engine, with a space between them.

[0004] The intake manifold in Patent Document 1 is made up of three members joined together in the intake and exhaust direction of the engine. By joining multiple members in this way, it becomes easy to manufacture an intake manifold with an internal space of a complex shape.

[0005] In addition, the multiple independent intake pipes in the intake manifold have the peripheral wall portion of the arc-shaped portion formed by joining a center member located in the center of the three members and a cover member located on the side farthest from the engine. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-70249 Summary of the Invention [Problem to be solved by the invention]

[0007] Incidentally, various components (auxiliary equipment) are disposed on the side of the engine where the intake manifold is attached. When such components are disposed near the intake manifold, it may be necessary to curve the independent intake pipes closest to the components among the multiple independent intake pipes in the direction of the engine's cylinder row to avoid interference with the components. Furthermore, when some of the independent intake pipes are curved as described above, the remaining independent intake pipes must be disposed radially outward of the intake lead-in pipe in the intake / exhaust direction of the engine, farther away from the intake lead-in pipe than the aforementioned independent intake pipe, in order to make the intake passage lengths of the aforementioned independent intake pipes and the remaining independent intake pipes as similar as possible to equalize the flow resistance of the air introduced into the intake port.

[0008] However, when constructing an intake manifold by joining multiple components as disclosed in Patent Document 1, if the remaining independent intake pipes are to be spaced apart from the intake introduction pipes, it is necessary to thicken the portion of the center member that forms the peripheral wall of the remaining independent intake pipes. Increasing the thickness of the center member in this way can lead to problems such as warping and other deformations in the center member, making it difficult to join the center member to the cover member.

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide an intake device for an engine that is easy to manufacture by joining multiple parts, and that has an intake manifold in which the pipe lengths of multiple independent intake pipes are uniform even when a layout is adopted in which some of the independent intake pipes are curved in the direction of the engine's cylinder row. [Means for solving the problem]

[0010] An engine intake system according to one aspect of the present invention includes an intake manifold attached to a cylinder head of the engine and formed by joining a plurality of members. The intake manifold has an intake introduction pipe and a plurality of independent intake pipes. The intake introduction pipe has a tubular passage and is a pipe portion that introduces fresh air. The plurality of independent intake pipes each have a tubular passage, are attached to the cylinder head of the engine, and are pipe portions that guide the fresh air to each of a plurality of intake ports formed in the cylinder head.

[0011] In the engine intake system according to this aspect, the intake introduction pipe is formed to extend along the cylinder row direction of the engine, and each of the plurality of independent intake pipes has a portion formed in an arc shape so as to surround the intake introduction pipe from the outside with a space remaining between the outer circumferential surface of the intake introduction pipe on the side opposite the engine. Furthermore, when the intake manifold is viewed from the front in the intake and exhaust direction of the engine, a first independent intake pipe located at one end in the cylinder row direction among the plurality of independent intake pipes is formed to curve more in the cylinder row direction than a second independent intake pipe separate from the first independent intake pipe, and when the intake manifold is viewed from the side in the cylinder row direction, the arc-shaped portion of the second independent intake pipe is formed to be farther away from the intake introduction pipe than the first independent intake pipe.

[0012] Furthermore, in the intake system of the engine according to this aspect, the multiple members constituting the intake manifold include a first member, a second member, and a third member. The first member is a member that constitutes a part of the peripheral wall of the intake introduction pipe. The second member is joined to the first member from the radially outer side of the intake introduction pipe and constitutes the arc-shaped portion of the first independent intake pipe by this joining. The third member is arranged on the radially outer side of the intake introduction pipe with a gap from the first member and constitutes the arc-shaped portion of the second independent intake pipe by joining to the second member.

[0013] In the engine intake device according to the above aspect, the arc-shaped portion of the first independent intake pipe is formed by joining a first member and a second member, while the arc-shaped portion of the second independent intake pipe is formed by joining a third member and a second member, so that the arc-shaped portion of the second independent intake pipe can be formed to be farther away from the intake lead-in pipe than the first independent intake pipe without increasing the thickness of the first member. Therefore, by curving the first independent intake pipe in the cylinder row direction and forming the arc-shaped portion of the second independent intake pipe to be farther away from the intake lead-in pipe and to surround the intake lead-in pipe in the radial direction, it is possible to match the pipe length of the first independent intake pipe and suppress deformation such as warping during manufacturing of the first member.

[0014] In the intake device of the engine according to the above aspect, the intake introduction pipe has an opening for taking in the fresh air at one end side in the cylinder row direction, the first independent intake pipe is an independent intake pipe among the plurality of independent intake pipes arranged on the opposite side in the cylinder row direction to the side where the opening of the intake introduction pipe is provided, the first member has a first wall portion constituting a part of the intake introduction pipe, and a second wall portion constituting a part of the first independent intake pipe and located on the intake introduction pipe side of the third member, and the first wall portion and the second wall portion are formed so that opposing wall surfaces are parallel to each other or so that the opposing wall surfaces move away from each other as they move from the one end side to the opposite side in the cylinder row direction.

[0015] In the engine intake device according to the above aspect, the first wall portion and the second wall portion of the first member are formed so that the opposing wall surfaces are parallel to each other or so that the wall surfaces are spaced apart from each other from one end to the other in the cylinder row direction, so that when the first member is manufactured using a split mold, the mold for forming the opposing wall surfaces can be removed to the other end. Thus, in the engine intake device according to the above aspect, the first member of the multiple members that make up the intake manifold can be formed satisfactorily.

[0016] In the engine intake device according to the above aspect, the arc-shaped portion of the first independent intake pipe may be curved so that the lower portion is located closer to the one end in the cylinder row direction than the upper portion in the cylinder axis direction of the engine, and a part other than the intake manifold may be arranged in the portion adjacent to the opposite side in the cylinder row direction of the first independent intake pipe so that a part of the part is located inside the curve of the first independent intake pipe.

[0017] In the engine intake device according to the above aspect, by curving the first independent intake pipe in the intake manifold in the cylinder row direction, it is possible to minimize wasted space in the engine compartment while preventing the first independent intake pipe from interfering with the other components arranged adjacent to the first independent intake pipe.Furthermore, in the engine intake device according to the above aspect, by aligning the pipe lengths of the first independent intake pipe and the second independent intake pipe while avoiding interference with the other components, it is possible to minimize variations in the flow resistance of fresh air toward the intake port of the engine.

[0018] In the engine intake device according to the above aspect, the intake manifold may further have a surge tank to which the intake introduction pipe and the plurality of independent intake pipes are joined, and the plurality of members constituting the intake manifold may further include a fourth member that is joined to the first member from the engine side and that constitutes the surge tank and the intake introduction pipe through this connection.

[0019] In the engine intake device according to the above aspect, the intake introduction pipe and surge tank can be formed by joining the first member and the fourth member, thereby reducing the number of members required to form the intake manifold.

[0020] In the engine intake device according to the above aspect, the first member, the second member, the third member, and the fourth member may each be made of a resin material.

[0021] In the engine intake device according to the above aspect, the first to fourth members constituting the intake manifold are each formed of a resin material, which makes manufacturing easier and reduces weight increase compared to when they are formed of a metal material, etc. Furthermore, as described above, the arc-shaped portion of the second independent intake pipe is formed using a third member separate from the first member, which reduces deformation such as warping during manufacturing of the first member, making it easier to manufacture.

[0022] In the engine intake device according to the above aspect, of the plurality of independent intake pipes, the remaining independent intake pipes excluding the first independent intake pipe, including the second independent intake pipe, may have the arc-shaped portion formed by joining the first member and the third member, and the third member may be integrally formed across all of the remaining independent intake pipes.

[0023] In the engine intake device of the above aspect, all of the multiple independent intake pipes except for the first independent intake pipe have arc-shaped portions formed by joining the first member and the third member, and the third member is integrally formed across all of the remaining independent intake pipes, so that the number of constituent members of the intake manifold can be prevented from increasing and management and handling of the third member becomes easier. [Effects of the Invention]

[0024] In the engine intake device according to each of the above aspects, the intake manifold is formed by joining multiple parts, making it easy to manufacture, and it is possible to align the pipe lengths of multiple independent intake pipes even when a layout is adopted in which some of the independent intake pipes are curved in the direction of the engine's cylinder row. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a front view showing a configuration of an intake device of an engine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a side view showing the configuration of an intake manifold. [Figure 3] FIG. 2 is an exploded perspective view showing the internal configuration of the intake manifold. [Figure 4] FIG. 2 is a perspective view showing the configuration of a center member and an inner cover member. [Figure 5] 2 is a cross-sectional view showing a partial configuration of a cross section taken along line VV in FIG. 1. [Figure 6] FIG. 2 is a cross-sectional view showing a partial configuration of a cross section taken along line VI-VI in FIG. [Figure 7] FIG. 10 is a perspective view showing the die-removal direction during manufacturing of the center member. [Figure 8] FIG. 8 is a cross-sectional view showing the configuration of a cross section taken along line VIII-VIII in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment except for its essential configuration.

[0027] In the drawings used in the following description, the "X direction" corresponds to the "cylinder row direction of the engine," the "Y direction" corresponds to the "engine intake / exhaust direction," and the "Z direction" corresponds to the "cylinder axis direction of the engine."

[0028] 1. Side structure of engine 20 The schematic structure of one side of the engine 20 in the engine compartment will be described with reference to Fig. 1. Note that Fig. 1 shows only some of the components (auxiliary equipment, etc.) arranged on one side of the engine 20.

[0029] As shown in Fig. 1, a multi-cylinder engine 20 is mounted in an engine room. The engine 20 is a four-cylinder engine with four cylinders aligned in the X direction. Four intake ports are formed in a cylinder head 20a of the engine 20, each connected to one of the cylinders and having an opening on the front side of Fig. 1.

[0030] Arranged on the side of the engine 20 (the near side in FIG. 1) are an intake manifold 10 provided in the intake device 1 and an ISG (Integrated Starter-Generator) 30, which is a separate member from the intake manifold 10. The ISG 30 is arranged adjacent to the intake manifold 10 on the left side in the X direction.

[0031] The intake manifold 10 is formed by integrally forming an intake introduction pipe 10a, a surge tank 10b, and four independent intake pipes 10c to 10f. The intake introduction pipe 10a has a tubular passage therein and is formed to extend in the X direction along the intake side surface of the engine 20. The intake introduction pipe 10a has an opening on the right side in the X direction in Figure 1, and a throttle valve is attached to this opening.

[0032] The surge tank 10b is connected to the passage of the intake air introduction pipe 10a at the left side in the X direction, and distributes fresh air introduced through the passage inside the intake air introduction pipe 10a to the four independent intake pipes 10c-10f. The intake air introduction pipe 10a is joined to the surge tank 10b at the upper part in the Z direction, at the left part in the X direction, and the four independent intake pipes 10c-10f are joined to the lower part in the Z direction.

[0033] The four independent intake pipes 10c to 10f are arranged side by side in the X direction. Each of the four independent intake pipes 10c to 10f has an arc-shaped portion extending from the lower portion in the Z direction where it is joined to the surge tank 10b, surrounding the intake introduction pipe 10a and the surge tank 10b from the outside with a space on the front side of the page relative to the intake introduction pipe 10a and the surge tank 10b.

[0034] Of the four independent intake pipes 10c to 10f, the independent intake pipe (#1 independent intake pipe) 10c located on the left side in the X direction has a curved section between its lower part in the Z direction joined to the surge tank 10b and its upper part in the Z direction attached to the cylinder head 20a, and its pipe axis L1 has a V-shape as shown in Figure 1. This is to avoid interference with the ISG 30 located adjacent to and in front of the intake manifold 10.

[0035] The independent intake pipe (#2 independent intake pipe) 10d located to the right of the #1 independent intake pipe 10c in the X direction has a curved portion and a V-shaped pipe axis L2 like the #1 independent intake pipe 10c, but the degree of curvature is smaller than that of the #1 independent intake pipe 10c.

[0036] The independent intake pipe (#3 independent intake pipe) 10e located to the right of the #2 independent intake pipe 10d in the X direction is formed so that its pipe axis L3 extends in a substantially straight line. The independent intake pipe (#4 independent intake pipe) 10f located to the right of the #3 independent intake pipe 10e in the X direction is formed so that its pipe axis L4 curves in the opposite direction to the #1 independent intake pipe 10c and the #2 independent intake pipe 10d, and is curved more gently than the #1 independent intake pipe 10c and the #2 independent intake pipe 10d.

[0037] 2. Independent intake pipes 10c to 10f in the intake manifold 10 The shapes of the independent intake pipes 10c to 10f when the intake manifold 10 is viewed from the side in the cylinder row direction of the engine 20 will be described with reference to Figure 2. For convenience of illustration, the #4 independent intake pipe 10f is not shown in Figure 2.

[0038] 2, each of the four independent intake pipes 10c to 10f is formed so as to extend upward in the Z direction from the joint with the surge tank 10b, with an arc-shaped portion surrounding the right side of the intake air introduction pipe 10a and surge tank 10b in the Y direction (the side opposite to the side where the engine 20 is disposed). A space 10g is provided between the arc-shaped portion of each of the four independent intake pipes 10c to 10f and the intake air introduction pipe 10a and surge tank 10b.

[0039] The outer surface of the arc in each of the #2 to #4 independent intake pipes 10d to 10f is arranged to protrude significantly to the right in the Y direction (the direction indicated by arrow A) more than the #1 independent intake pipe 10c. This is because, as shown in Figure 1, the pipe axis L1 of the #1 independent intake pipe 10c is greatly curved in front view, and the pipe path lengths of the #2 to #4 independent intake pipes 10d to 10f are made to be the same as that of the #1 independent intake pipe 10c.

[0040] 2, the #3 independent intake pipe 10e, which is formed so that the pipe axis L3 extends substantially linearly in a front view, is formed so as to protrude more to the right in the Y direction than the #2 and #4 independent intake pipes 10d and 10f, which have curved pipe axes L2 and L4. In other words, the degree to which the #2 to #4 independent intake pipes 10d to 10f protrude to the right in the Y direction is determined by the degree of curvature of the pipe axes L2 to L4 shown in FIG. 1, with the #1 independent intake pipe 10c as the reference.

[0041] 3. Structure of the intake manifold 10 In this embodiment, the intake manifold 10 is formed by joining four members 100 to 103. This structure will be described with reference to FIGS.

[0042] As shown in FIG. 2, the intake manifold 10 has an outer shell formed by joining a center member (first member) 100, an outer cover member (second member) 101, and a base member (fourth member) 102 in the Y direction.

[0043] A base member 102 is joined to the center member 100 from the left side in the Y direction, thereby forming the intake air introduction pipe 10a and surge tank 10b. An outer cover member 101 is joined to the right side in the Y direction of the center member 100. The outer cover member 101 forms the outer wall portion of the arcs of the four independent intake pipes 10c to 10f.

[0044] 3, the center member 100 has four openings 100a to 100d in its lower portion. These openings 100a to 100d are openings (inlet openings) that connect the internal space of the surge tank 10b with the pipes (tubular passages) of the independent intake pipes 10c to 10f.

[0045] The center member 100 also has openings 100e-100h at its upper part. These openings 100e-100h are openings (outlet openings) that connect the pipes of the independent intake pipes 10c-10f to the intake ports of the cylinder head 20a when the intake manifold 10 is attached to the cylinder head 20a.

[0046] 3, an inner cover member 103 is interposed between the center member 100 and the outer cover member 101. The inner cover member 103 is interposed in the portions that form the #2 to #4 independent intake pipes 10d to 10f.

[0047] The #1 independent intake pipe 10c in the intake manifold 10 is formed by joining the #1 outer cover portion 101a of the outer cover member 101 and the portion of the center member 100 where the inner cover member 103 is not inserted.

[0048] On the other hand, the #2 to #4 independent intake pipes 10d to 10f are formed by joining the #2 to #4 outer cover portions 101b to 101d of the outer cover member 101 to the inner cover member 103, respectively.

[0049] In this embodiment, the members 100 to 103 are made of a resin material and are joined together by welding.

[0050] 4. Detailed structure of the inner cover member 103 The detailed structure of the inner cover member 103 will be described with reference to FIG.

[0051] 4, the inner cover member 103 is formed integrally with a #2 inner cover portion 103a, a #3 inner cover portion 103b, a #4 inner cover portion 103c, and connecting portions 103d and 103e. The inner cover member 103 is disposed on a portion of the wall portion 100i of the center member 100 that faces the outer cover member 101 (the portion that constitutes the #2 to #4 independent intake pipes 10d to 10f).

[0052] The #2 inner cover portion 103a is joined to the #2 outer cover portion 101b of the outer cover member 101 to form the peripheral wall of the #2 independent intake pipe 10d. The #3 inner cover portion 103b is joined to the #3 outer cover portion 101c of the outer cover member 101 to form the peripheral wall of the #3 independent intake pipe 10e. The #4 inner cover portion 103c is joined to the #4 outer cover portion 101d of the outer cover member 101 to form the peripheral wall of the #4 independent intake pipe 10f.

[0053] The connecting portion 103d connects the #2 inner cover portion 103a to the #3 inner cover portion 103b at a location between the openings 100b, 100c and the openings 100f, 100g and near the openings 100b, 100c. The connecting portion 103e connects the #3 inner cover portion 103b to the #4 inner cover portion 103c at a location between the openings 100c, 100d and the openings 100g, 100h and near the openings 100c, 100d.

[0054] 5.Detailed structure of #2~#4 independent intake pipes 10d~10f The detailed structure of the #2 to #4 independent intake pipes 10d to 10f will be described with reference to Figures 5 and 6. Note that, although Figure 5 shows only the #3 independent intake pipe 10e among the #2 to #4 independent intake pipes 10d to 10f, the #2 and #4 independent intake pipes 10d and 10f have the same basic structure.

[0055] As shown in Fig. 5, the #3 independent intake pipe 10e is disposed so as to surround the radially outer side of the intake introduction pipe 10a, with a space 10g therebetween. A gap 10h is provided between the #3 inner cover portion 103b of the inner cover member 103, which forms part of the peripheral wall of the #3 independent intake pipe 10e, and the wall portion 100i of the center member 100. As shown in Fig. 6, gaps 10i and 10j are also provided between the #2 inner cover portion 103a and the #4 inner cover portion 103c, which form the #2 and #4 independent intake pipes 10d and 10f, and the wall portion 100i of the center member 100, respectively.

[0056] 6, the wall portion 100i of the center member 100 has a substantially uniform thickness from the portion that forms part of the peripheral wall of the #1 independent intake passage 10c in the X direction to the portion that is disposed inside the #4 independent intake pipe 10f. The surface of the wall portion 100i opposite the side to which the outer cover member 101 is joined is flat and smooth.

[0057] The #2 to #4 independent intake pipes 10d to 10f, each of which has a part of its peripheral wall formed by the inner cover portions 103a, 103b, and 103c of the inner cover member 103, are configured so that their pipe heights H2, H3, and H4 in the Y direction, based on the main surface of the wall portion 100i of the center member 100, are higher than the pipe height H1 of the #1 independent intake pipe 10c. The gaps 10h to 10j are set according to the pipe heights H2 to H4 of the #2 to #4 independent intake pipes 10d to 10f.

[0058] 6. Mold opening direction and detailed structure during manufacturing of center member 100 As described above, the center member 100 is made of a resin material. The center member 100 is manufactured by filling a cavity formed by clamping multiple split molds with a resin material. The mold opening direction during the manufacture of the center member 100 and the detailed structure of the center member 100 will be described with reference to Figures 7 and 8.

[0059] 7, in this embodiment, at least six split molds are used to form the center member 100. Specifically, two molds are arranged facing each other in the thickness direction, with a space in between where the wall portions 100i are to be formed, and two molds are used that close the two molds from above and below in the Z direction, and two molds that close both sides in the X direction.

[0060] When manufacturing the center member 100, the mold opening direction after resin filling is completed and the resin has solidified is indicated by arrows D1 to D6. Of these, the mold opening direction indicated by arrow D6 is set to a slightly inclined direction relative to the X direction in order to form an inlet pipe wall portion 100j that surrounds the opening 100k, because the opening 100k at the portion that becomes one end of the intake air inlet pipe 10 is in an oblique direction at an angle relative to the X direction.

[0061] The center member 100 is formed using a molding method in which the mold opening directions D1 to D6 are set as described above, so that the opposing surfaces 100m, 100n of the wall 100l that forms part of the intake air introduction pipe 10a and part of the surge tank 10b and the wall 100i to which the outer cover member 101 and the inner cover member 103 are joined are parallel to each other or gradually widen toward the left in the X direction (mold opening direction D5), as shown in Figure 8. This allows for smooth mold opening and makes it easy to manufacture the center member 100.

[0062] Since mold opening direction D6 is an oblique direction at an angle to the X direction, opposing surfaces 100m, 100n of wall portion 100i and wall portion 100l are formed by a molding die that opens in direction D5.

[0063] 7.Effects In the intake device 1 of this embodiment, the #1 independent intake pipe 10c is formed by joining a center member 100 and an outer cover member 101, while the #2 to #4 independent intake pipes 10d to 10f are formed by joining an inner cover member 103 and an outer cover member 101.Therefore, even if the thickness of the portions of the wall portion 100i of the center member 100 corresponding to the #2 to #4 independent intake pipes 10d to 10f is not increased, the arc-shaped portions of the #2 to #4 independent intake pipes 10d to 10f can be formed farther away from the intake introduction pipe 10a and the surge tank 10c than the #1 independent intake pipe 10c. Therefore, by curving the #1 independent intake pipe 10c in the X direction and arranging the arc-shaped portions of the #2 to #4 independent intake pipes 10d to 10f so that they are far away from the intake introduction pipe 10a and the surge tank 10b, it is possible to align the pipe length with that of the #1 independent intake pipe 10c while suppressing deformation such as warping during the manufacturing of the center member 100.

[0064] Furthermore, in the intake device 1 according to this embodiment, the wall portions 100i and 100l of the center member 100 constituting the intake manifold 10 are formed so that the opposing surfaces are parallel to each other or so that the wall surfaces 100m, 100n move apart in the mold-opening direction D5. Therefore, when manufacturing the center member 100 using a split mold, the mold for forming the opposing surfaces 100m, 100n can be removed in the mold-opening direction D5. Therefore, in the intake device 1, the center member 100, which is one of the members 100 to 103 constituting the intake manifold 10, can be formed well.

[0065] Furthermore, in the intake device 1 according to this embodiment, by curving the #1 independent intake pipe 10c in the intake manifold 10 in the X direction, it is possible to minimize wasted space in the engine room while preventing the #1 independent intake pipe 10c from interfering with the ISG 30 arranged adjacent to the #1 independent intake pipe 10c. In addition, in the intake device 1, by aligning the pipe lengths of the #1 independent intake pipe 10c and the #2 to #4 independent intake pipes 10d to 10f while avoiding interference with the ISG 30, it is possible to minimize variations in the flow resistance of fresh air toward the intake ports of the engine 20.

[0066] Furthermore, in the intake device 1 according to this embodiment, the intake introduction pipe 10a and surge tank 10b can be formed by joining the center member 100 and the base member 102, thereby reducing the number of parts required to form the intake manifold 10.

[0067] Furthermore, in the intake system 1 according to this embodiment, each of the components 100-103 that make up the intake manifold 10 is made of a resin material, which makes manufacturing easier and reduces weight increases compared to when they are made of a metal material. As described above, the inner cover member 103, which is separate from the center member 100, is used to form part of the peripheral walls of the #2-#4 independent intake pipes 10d-10f, which reduces deformation such as warping during manufacturing of the center member 100, making it easier to manufacture.

[0068] Furthermore, in the intake device 1 according to this embodiment, the #2 to #4 independent intake pipes 10d to 10f out of the #1 to #4 independent intake pipes 10c to 10f have peripheral walls formed by joining the center member 100 and the inner cover member 103, and the inner cover member 103 is integrally formed across the #2 to #4 independent intake pipes 10d to 10f, which prevents the number of components of the intake manifold 10 from increasing and also makes it easier to manage and handle the inner cover member 103.

[0069] As described above, in the intake system 1 according to this embodiment, the intake manifold 10 is formed by joining multiple components 100 to 103, making it easy to manufacture, and it is possible to align the pipe lengths of the #1 to #4 independent intake pipes 10c to 10f even when adopting a layout in which the #1 independent intake pipe 10c is curved in the X direction.

[0070] [Variations] In the above embodiment, the four-cylinder engine 20 is used as an example of the engine, but the present invention can also use a three-cylinder or five or more cylinder engine.

[0071] In the above embodiment, ISG30 was used as an example of "other parts," but in the present invention, it is also possible to place various parts such as an A / C compressor, a starter motor, and an alternator (a power generation device that does not function as a driving source) in the same position.

[0072] In the above embodiment, the components 100 to 103 that make up the intake manifold 10 are made of a resin material, but in the present invention, some or all of the components may be made of a material other than a resin (for example, a metal material).

[0073] In the above embodiment, the inner cover member 103 is configured such that the #2 inner cover portion 103a and the #3 inner cover portion 103b are connected by the connection portion 103d, and the #3 inner cover portion 103b and the #4 inner cover portion 103c are connected by the connection portion 103e, thereby forming the entire unit as a single unit. However, in the present invention, it is also possible to adopt a configuration in which multiple inner cover portions are not connected.

[0074] In the above embodiment, when the intake manifold 10 is viewed from the front in the Y direction, the #1 independent intake pipe 10c is configured to be more curved than the other independent intake pipes 10d to 10f. However, in the present invention, it is also possible to adopt a configuration in which the independent intake pipe located at the end opposite the #1 independent intake pipe in the X direction is more curved than the other independent intake pipes.

[0075] In the above embodiment, the intake manifold 10 has a structure including a surge tank 10b, but the present invention can also use an intake manifold that does not have a surge tank 10b. In this case, a structure in which multiple independent intake pipes are joined to the intake introduction pipe can be used. [Explanation of symbols]

[0076] 1. Intake system 10. Intake manifold 10a Intake intake pipe 10b Surge tank 10c~10f Independent intake pipe 10g space 20 Engine 30 ISG (other parts) 100 Center member (first member) 101 outer cover member (second member) 102 base member (fourth member) 103 inner cover member (third member)

Claims

1. An intake system for an engine, comprising: an intake manifold attached to the cylinder head of the engine and formed by joining a plurality of members; The intake manifold is an intake air introduction pipe having a tubular passage and introducing fresh air; a plurality of independent intake pipes each having a tubular passage, attached to a cylinder head of the engine, and configured to deliver the fresh air to a plurality of intake ports formed in the cylinder head; and The intake air introduction pipe is formed to extend along the cylinder row direction of the engine, each of the plurality of independent intake pipes has a portion formed in an arc shape so as to surround the intake introduction pipe from the outside with a space provided between the portion and an outer peripheral surface of the intake introduction pipe on the opposite side to the engine, when the intake manifold is viewed from the front in an intake / exhaust direction of the engine, a first independent intake pipe located at one end in the cylinder row direction among the plurality of independent intake pipes is formed to be curved in the cylinder row direction to a greater extent than a second independent intake pipe separate from the first independent intake pipe, when the intake manifold is viewed from a side in the cylinder row direction, the arc-shaped portion of the second independent intake pipe is formed to be farther away from the intake introduction pipe than the first independent intake pipe, The plurality of components constituting the intake manifold include: a first member that constitutes a part of the peripheral wall of the intake air introduction pipe; a second member joined to the first member from a radially outer side of the intake introduction pipe, the second member forming the arc-shaped portion of the first independent intake pipe by the joining; a third member that is disposed radially outward of the intake introduction pipe with a gap therebetween relative to the first member and that forms the arc-shaped portion of the second independent intake pipe by joining with the second member; Contains, Engine intake system.

2. 2. The engine intake system according to claim 1, the intake air introduction pipe has an opening for taking in the fresh air at one end side in the cylinder row direction, the first independent intake pipe is an independent intake pipe, among the plurality of independent intake pipes, that is arranged on a side opposite to a side on which the opening of the intake introduction pipe is provided in the cylinder row direction, the first member has a first wall portion constituting a part of the intake air introduction pipe, and a second wall portion constituting a part of the first independent intake pipe and located on the intake air introduction pipe side of the third member, The first wall portion and the second wall portion are formed such that opposing wall surfaces are parallel to each other, or such that the opposing wall surfaces are spaced apart from each other as they move from the one end side to the opposite end side in the cylinder row direction. Engine intake system.

3. 3. The engine intake system according to claim 2, the arc-shaped portion of the first independent intake pipe is curved so that a lower portion thereof is located closer to the one end in the cylinder row direction than an upper portion thereof in the cylinder axis direction of the engine, a component separate from the intake manifold is disposed at a portion adjacent to the opposite side in the cylinder row direction of the first independent intake pipe so that a portion of the component is located inside a curve of the first independent intake pipe; Engine intake system.

4. The engine intake system according to any one of claims 1 to 3, the intake manifold further includes a surge tank to which the intake introduction pipe and the plurality of independent intake pipes are joined, The plurality of components constituting the intake manifold include: a fourth member that is joined to the first member from the engine side and that constitutes the surge tank and the intake air introduction pipe by this joining, Engine intake system.

5. 5. The engine intake system according to claim 4, the first member, the second member, the third member, and the fourth member are each formed from a resin material; Engine intake system.

6. The engine intake system according to any one of claims 1 to 3, Among the plurality of independent intake pipes, the remaining independent intake pipes excluding the first independent intake pipe, and all the remaining independent intake pipes including the second independent intake pipe, have the arc-shaped portion formed by joining the first member and the third member, the third member is integrally formed over all the remaining independent intake pipes. Engine intake system.

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