JP2010265870A - Intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake manifold capable of evenly distributing gas to each of branch passages. <P>SOLUTION: This intake manifold 10 includes a surge tank chamber 24 and four branch passages 28, and includes a gas tank chamber 95, into which the gas to be refluxed to an engine is led and which distributes the gas to a plurality of branch passages 28. The gas to be led into the gas tank chamber 9 is blow-by gas. A wall 97 forming each branch passage 28 and a wall forming the gas tank chamber 95 are integrally formed with each other. The surge tank chamber 24 and the gas tank chamber 95 are arranged adjacent to each other through a partition wall 98. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an intake manifold used for an internal combustion engine, a so-called engine.

  A conventional intake manifold includes a surge tank chamber and a plurality of branch passages, and introduces a gas such as blow-by gas to the engine into the surge tank chamber (see, for example, Patent Document 1).

JP 2008-69755 A

In the conventional example, gas is distributed to the plurality of branch passages via the surge tank chamber. With such a configuration, since the distance between the gas inlet to the surge tank chamber and the respective passage inlets of each branch passage is different, it is difficult to evenly distribute the gas to each branch passage. It was. This causes variations in the air-fuel ratio among the cylinders of the engine, which may lead to worsening of emissions, and hence improvement is desired.
The problem to be solved by the present invention is to provide an intake manifold capable of equalizing gas distribution to each branch passage.

The above-mentioned problems can be solved by an intake manifold having the gist of the configuration described in each claim.
That is, according to the intake manifold of the first aspect, a gas tank chamber is provided for introducing a gas to be reduced to the engine and distributing the gas to the plurality of branch passages. Therefore, by introducing the gas into the gas tank chamber and mixing the gas in the gas tank chamber, the gas is directly distributed to the plurality of branch passages without going through the surge tank chamber. Distribution can be equalized.

  As in the intake manifold described in claim 2, the gas introduced into the gas tank chamber may be blow-by gas.

  Further, as in the intake manifold described in claim 3, the gas introduced into the gas tank chamber may be a purge gas.

  According to the intake manifold of the fourth aspect, the wall forming the plurality of branch passages and the wall forming the gas tank chamber are integrated. Therefore, the rigidity of the intake manifold can be improved and the intake manifold can be downsized as compared with the case where the wall forming the plurality of branch passages and the wall forming the gas tank chamber are configured separately.

  According to the intake manifold described in claim 5, the surge tank chamber and the gas tank chamber are adjacent to each other via the partition wall. Therefore, compared to the case where the surge tank chamber and the gas tank chamber are separated from each other, the rigidity of the intake manifold can be improved and the intake manifold can be downsized.

1 is a front view showing an intake manifold according to Embodiment 1. FIG. It is a left view which shows an intake manifold. It is a right view which shows an intake manifold. It is a rear view which shows an intake manifold. FIG. 5 is a cross-sectional view taken along line VV in FIG. 1. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1. It is a front view which shows a manifold main body. It is a left view which shows a manifold main body. It is a right view which shows a manifold main body. It is a front view which shows a 1st piece. It is a rear view which shows a 1st piece. It is XII-XII sectional view taken on the line of FIG. It is XIII-XIII sectional view taken on the line of FIG. FIG. 11 is a cross-sectional view taken along line XIV-XIV in FIG. 10. It is XV-XV arrow directional cross-sectional view of FIG. FIG. 11 is a cross-sectional view taken along line XVI-XVI in FIG. 10. It is an end view which shows the connection flange of a manifold main body. It is an end elevation which shows the connection flange of the upstream of a connection member. It is a rear view which shows a 2nd piece. It is a front view which shows a 3rd piece. It is a disassembled perspective view which shows the upstream channel | path part of a purge gas channel | path. It is a disassembled perspective view which shows the downstream channel | path part of a purge gas channel | path. It is a perspective view which shows a reinforcement rib. It is sectional drawing which shows a reinforcement rib. FIG. 20 is a cross-sectional view taken along the line XXV-XXV in FIG. 19. It is a top view which shows a throttle mounting flange. It is a right view shown in the state which mounted the intake manifold on the mounting base. It is a front view which shows the attachment part of a purge control valve. It is a side view which shows the attachment part of a purge control valve. 6 is a front view showing a manifold body according to Embodiment 2. FIG. It is XXXI-XXXI sectional view taken on the line of FIG. FIG. 32 is a cross-sectional view taken along line XXXII-XXXII in FIG. 31. 6 is a front view showing a manifold body according to Embodiment 3. FIG. FIG. 34 is a cross-sectional view taken along line XXXIV-XXXIV in FIG. 33. FIG. 34 is a cross-sectional view taken along line XXXV-XXXV in FIG. 33. It is sectional drawing which shows the fastening structure by the headed bolt which concerns on Example 4. FIG. It is sectional drawing which shows the fastening structure by a stud bolt.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Example 1]
A first embodiment of the present invention will be described. In this embodiment, an intake manifold applied to an in-line four-cylinder engine is illustrated. For convenience of explanation, each part of the manifold body will be explained after the basic configuration of the intake manifold is explained.

[Basic structure of intake manifold]
The basic configuration of the intake manifold will be described. 1 is a front view showing the intake manifold, FIG. 2 is a left side view, FIG. 3 is a right side view, and FIG. 4 is a rear view.
As shown in FIG. 1, the intake manifold 10 includes a manifold body 12 that forms the main body and a connecting member 14 that is connected to the downstream side of the intake air flow of the manifold body 12 (FIGS. 2 to 4). reference). 7 is a front view showing the manifold body, FIG. 8 is a left side view, and FIG. 9 is a right side view.

  As shown in FIG. 9, the manifold body 12 is divided into three parts in the front-rear direction (left-right direction in FIG. 9), and the second piece 20 on the front side (left side in FIG. 9) of the central first piece 18. Are joined by welding (for example, vibration welding), and the third piece 22 is joined by welding (for example, vibration welding) to the rear side (right side in FIG. 9) of the first piece 18. (See FIG. 8). 8 and 9, the two pieces 20 and 22 before welding to the first piece 18 are indicated by two-dot chain lines 20 and 22. FIG. 10 is a front view showing the first piece, FIG. 11 is a rear view, FIG. 19 is a rear view showing the second piece, and FIG. 20 is a front view showing the third piece.

  The pieces 18, 20, and 22 are made of resin, and are formed by, for example, injection molding. The first piece 18 is a member forming the main body of the manifold body 12. The second piece 20 is a member that covers the front side of the first piece 18. The third piece 22 is a member that covers the rear side of the first piece 18. In addition, a horizontally elongated surge tank chamber 24 as a volume portion for reducing intake pulsation is formed on the upper portion of the manifold body 12 by joining the three pieces 18, 20, and 22. The surge tank chamber 24 is represented in FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. Moreover, in each piece 18, 20, and 22, the same code | symbol and 24 are attached | subjected to the part which comprises the surge tank chamber 24 (refer FIG.10, FIG.11, FIG.19, FIG.20).

As shown in FIG. 10, a throttle mounting flange 32 having an intake inlet 33 is formed on the right portion of the upper wall portion of the surge tank chamber 24 in the first piece 18. The throttle mounting flange 32 is shown in plan view in FIG.
As shown in FIG. 26, the throttle mounting flange 32 protrudes a positioning stay 35 having a positioning pin 36 that protrudes rearward (downward in FIG. 26) and protrudes on the tip portion. A positioning pin 37 protrudes from the upper end surface of the throttle mounting flange 32. Both positioning pins 36 and 37 are arranged with a positional relationship that is separated by a predetermined angle in the circumferential direction of the throttle mounting flange 32.

  As shown in FIG. 10, when the throttle body 17 of the throttle device 16 is attached to the throttle mounting flange 32, both positioning pins 36 and 37 and both positioning holes (not shown) provided on the throttle body 17 side are fitted. As a result, the throttle body 17 is positioned with respect to the throttle mounting flange 32. The throttle body 17 can be mounted on the throttle mounting flange 32 by fastening bolts (not shown) or the like. An air cleaner (not shown) is connected to the upstream side of the throttle body 17. Therefore, the intake air flowing into the throttle body 17 from the air cleaner is introduced into the surge tank chamber 24 from the intake air inlet 33. The throttle device 16 adjusts the amount of intake air to the surge tank chamber 24 by opening and closing a throttle valve (not shown) rotatably provided on the throttle body 17. The throttle body 17 is provided with a cooling water pipe (not shown) through which engine cooling water (hot water) flows.

  As shown in FIG. 12, four branch passages 28 branching from the surge tank chamber 24 are formed by joining the first piece 18 and the third piece 22. Moreover, in each piece 18 and 22, the same code | symbol and 28 are attached | subjected to the part which comprises the branch channel | path 28 (refer FIG.11 and FIG.20). As shown in FIGS. 11 and 20, the respective branch passages 28 are arranged in the left-right direction as a pair of left and right. As shown in FIG. 11, a horizontally long connection flange 30 is formed at the lower end of the first piece 18. Outlets of the respective branch passages 28 are opened on the lower surface side of the connection flange 30 (see FIG. 12). FIG. 17 is an end view showing the connection flange of the manifold body.

Joining flanges 39, 41, and 43 are formed on the joining surfaces for welding the outer peripheral portions of the pieces 18, 20, and 22 (see FIGS. 10, 19, and 20). In addition, the same code | symbol is attached | subjected to the part considered as substantially the same structure in the joining flange 39,41,43. 13 is a cross-sectional view taken along line XIII-XIII in FIG.
As shown in FIG. 13, a welding portion 44 forming a ridge is formed on the joining surface of one joining flange 39. Further, on the joint surface of the other joining flanges 41 and 43, a welded portion 45 forming a ridge, and a burr hidden portion 47 forming a ridge protruding through a groove 46 on the outer peripheral side of the welded portion 45, In addition, a burr hidden portion 49 that forms a protrusion protruding through a groove 48 is formed on the inner peripheral side of the weld portion 45. In addition, hooking walls 51 are formed at the outer peripheral ends of the surfaces opposite to the joint surfaces of the other joint flanges 41 and 43, respectively. The welded portions 44 and 45 are not limited to the joint flanges 39, 41, and 43, and are appropriately set to portions necessary for joining the pieces. Further, the outer concave groove 46 and the burr hidden portion 47 and / or the inner concave groove 48 and the burr hidden portion 49 are also set as necessary.

  When each piece 20 (or 22) is welded to the first piece 18, the joint flange 41 of the second piece 20 (or the third piece 22) is placed on the joint flange 39 of the first piece 18. (Or 43) in a state in which the welding flanges 39 and 41 (or 43) are vibrated and welded by the vibration welding apparatus, respectively, so that the welded portions 44 and 45 of both the joining flanges 39 and 41 (or 43) are obtained. Welded together. In welding each piece 20, 22 to the first piece 18, the vibration welding apparatus with the first piece 18 disposed on the lower side and the second piece 20 and the third piece 22 disposed on the upper side. While both pieces 18 and 20 (or 22) are pressed and held between the upper mold and the lower mold, vibration is applied to each piece 20 (or 22) by the upper mold. At this time, the hook portion 54 of the upper welding jig 53 is hooked on the hook wall 51 of each piece 20 (or 22). As described above, the manifold main body 12 is configured by joining the pieces 18, 20, and 22 (see FIGS. 7 to 9).

As shown in FIG. 1, the connecting member 14 is made of metal, for example, aluminum die cast, and includes four communication passages 56 arranged in the left-right direction. An upstream connection flange 58 is formed at the upper end of the connection member 14. In the connection flange 58, the inlet of each communication passage 56 is opened. FIG. 18 is an end view showing the connecting flange on the upstream side of the connecting member.
As shown in FIG. 2, a downstream connection flange 60 is formed at the lower end of the connection member 14. In the connection flange 60, the outlet of each communication passage 56 is opened. The outlet of each communication passage 56 is directed rearward (leftward in FIG. 2). Furthermore, a metal, for example, aluminum die-cast cover flange 62 is fastened to the connection flange 60 by a bolt 63 or the like via a gasket or the like (not shown). In the cover flange 62, communication ports 64 communicating with the communication passages 56 (see FIG. 1) are formed (see FIG. 4).

  As shown in FIG. 1, the connection flange 30 of the manifold body 12 and the connection flange 58 on the upstream side of the connection member 14 are fastened by bolts or the like via a gasket or the like (not shown). Thereby, each branch passage 28 (see FIG. 17) of the manifold body 12 and each communication passage 56 (see FIG. 18) of the connecting member 14 are communicated with each other. Thus, the intake manifold 10 is comprised by integrating the manifold main body 12 and the connection member 14 (refer FIGS. 1-4). Further, a cover flange 62 (see FIG. 1) of the connecting member 14 is fastened to a suction side of an engine head (not shown) of a so-called cylinder head by a bolt or the like. Therefore, the intake air branched from the surge tank chamber 24 of the manifold main body 12 to each branch passage 28 passes through each communication passage 56 of the connecting member 14 and each communication port 64 (see FIG. 4) of the cover flange 62, and the cylinder head. It is supplied to the combustion chamber of each cylinder via each intake port. A fastening structure between the connection flange 30 of the manifold body 12 and the connection flange 58 on the upstream side of the connection member 14 will be described later.

Next, each part of the manifold body 12 of the intake manifold 10 will be described.
[(1) Purge gas passage]
The purge gas passage will be described.
The manifold body 12 is provided with a purge gas passage 68 for introducing purge gas desorbed from a canister (not shown) into the surge tank chamber 24 (see FIGS. 10, 11, 19, and 20). The purge gas passage 68 is formed by joining the three pieces 18, 20, and 22. The purge gas passage 68 is an upstream passage portion formed by joining a purge gas introduction port 69 (see FIG. 19) provided in the second piece 20 and the first piece 18 and the second piece 20. 70 (see FIGS. 10 and 19) and a downstream passage portion 72 (see FIGS. 11 and 20) configured by joining the first piece 18 and the third piece 22 to each other. The purge gas passage 68 corresponds to a “communication passage” in this specification. FIG. 21 is an exploded perspective view showing the upstream passage portion of the purge gas passage, and FIG. 22 is an exploded perspective view showing the downstream passage portion.

  As shown in FIG. 7, the purge gas introduction port 69 is formed so that the opening end is directed leftward at the upper end portion of the second piece 20. Connected to the purge gas introduction port 69 is a downstream end of a purge gas hose 74 made of a rubber hose through which purge gas from the purge port of the canister 76 flows. A purge control valve 75 including an electromagnetic flow control valve for controlling the flow rate of the purge gas is interposed in the middle of the purge gas hose 74. The canister 76 adsorbs evaporated fuel generated in a fuel tank (not shown) and desorbs the evaporated fuel as purge gas when the engine is operated.

As shown in FIG. 21, the upstream passage portion 70 is formed in an L-shaped groove shape along the joining surface that is a split surface of the upper portion of the first piece 18 and the second piece 20. The pieces 18 and 20 are joined to form an L-shaped tube. In addition, in both pieces 18 and 20, the same code | symbol and 70 are attached | subjected to the part which comprises the upstream channel | path part 70. FIG.
Further, the upstream end, that is, the upper end portion of the upstream passage portion 70 is communicated with the purge gas introduction port 69. In addition, a communication hole 83 penetrating in the front-rear direction is formed at the downstream end of the lower right end portion of the upstream passage portion 70 (see FIG. 10). Further, the welded portions 44 and 45 of the pieces 18 and 20 are formed so as to surround the upstream passage portion 70 (see FIGS. 10, 19, and 21).

As shown in FIG. 22, the downstream passage portion 72 is formed in a horizontally long shape along the joining surface that is a dividing surface of the upper portion of the first piece 18 and the third piece 22. , 22 are formed into a horizontally long tubular shape. In addition, in both pieces 18 and 20, the same code | symbol and 72 are attached | subjected to the part which comprises the downstream channel | path part 72. FIG.
Further, the upstream end, that is, the left end portion (the right end portion in FIG. 11) of the downstream side passage portion 72 communicates with the communication hole 83. Further, the downstream end, that is, the right end of the downstream passage portion 72 (the right end portion of the downstream passage portion 72 of the first piece 18 (the right end portion in FIG. 11) and the right end of the downstream passage portion 72 of the third piece 22. 20 (the right end in FIG. 20) communicates with the surge tank chamber 24 via a lead-out port 88 that opens downward (see FIGS. 11, 20, and 22). The welded portions 44 and 45 are formed so as to surround the downstream side passage portion 72 (excluding the outlet port 88) (see FIGS. 11, 20, and 22). 88 is arranged at a position adjacent to the rear side (the front side of the drawing in FIG. 11) of the intake inlet 33. The purge gas that has flowed out of the outlet 88 into the surge tank chamber 24 is taken into the intake air in the surge tank chamber 24. Each after being mixed It is distributed to 岐通 path 28.

  A side wall portion (corresponding to the upper wall portion of the surge tank chamber 24) including the upstream-side passage portion 70 and the downstream-side passage portion 72 in the purge gas passage 68 is in both pieces 18, 20, 18, 22 welded to each other. This corresponds to the side wall including the dividing surface of the surge tank chamber 24. The upper wall portion of the surge tank chamber 24 includes a passage inner wall portion (passage lower wall portion) and a passage outer wall portion (passage upper wall portion), and a purge gas passage communicating with the surge tank chamber 24 between the both wall portions. 68, each of the passage portions 70 and 72 has a double wall portion, and the passage inner walls (passage lower wall portions) and the passage outer wall portions (passage upper wall portions) of the passage portions 70 and 72 respectively. It is welded.

  According to the above configuration, the side wall portion (upper wall portion) including the dividing surface of the surge tank chamber 24 in the two pieces 18, 20, 18, 22 welded to each other includes the passage inner wall portion and the passage outer wall portion, and Double wall portions serving as passage portions 70 and 72 of the purge gas passage 68 communicating with the surge tank chamber 24 are provided between the both wall portions. Therefore, by providing the double wall portion on the side wall portion (upper wall portion) of the surge tank chamber 24, the pressure resistance strength of the side wall portion can be improved. Further, the passage portions 70 and 72 of the purge gas passage 68 communicating with the surge tank chamber 24 can be formed using the space between the inner wall portion and the outer wall portion of the double wall portion.

  Further, the passage inner walls and the passage outer walls of the passage portions 70 and 72 of the purge gas passage 68 are welded. Therefore, the side wall part (upper wall part) including the dividing surface of the surge tank chamber 24 has a double welded structure, whereby the pressure resistance strength of the side wall part can be further improved.

  Further, the outlet 88 of the purge gas passage 68 is disposed at a position adjacent to the intake inlet 33 of the surge tank chamber 24 (see FIG. 11). Here, the position where the outlet 88 is adjacent to the intake inlet 33 refers to a position where the purge gas derived from the outlet 88 is affected by the flow of intake air flowing through the intake inlet 33. For this reason, compared with the case where the outlet port 88 is arranged at a position away from the inlet port 33 so that the purge gas led out from the outlet port 88 is not affected by the flow of the intake air flowing through the inlet port 33. Thus, the mixing action of the intake air and the purge gas is effectively performed in the surge tank chamber 24. Thereby, the amount of purge gas distributed from the surge tank chamber 24 to each branch passage 28 can be equalized. This is effective when the distance between the intake inlet 33 of the intake manifold 10 and the inlet of each branch passage 28 is short and the main flow of the intake flow is not generated or is not easily generated.

[(2) Reinforcement rib]
The reinforcing rib will be described.
As shown in FIG. 4, a plurality of reinforcing ribs 92 are formed at predetermined intervals in the left-right direction on the outer surface of the third piece 22, that is, on the upper portion of the rear wall of the surge tank chamber 24. Further, the reinforcing ribs 92 positioned at the left and right ends are inclined so that the lower sides are inward of each other. FIG. 23 is a perspective view showing the reinforcing rib, and FIG. 24 is a cross-sectional view showing the reinforcing rib.
As shown in FIG. 23, the reinforcing rib 92 of the second piece 22 has a flat plate shape extending in the vertical direction, and an end portion (lower end portion in FIG. 23) on the side of the joining flange 43 intersects the joining flange 43. It is formed to make. Further, the hooking wall 51 of the second piece 22 is divided by the reinforcing rib 92 therebetween. The hook wall 51 corresponds to a “projection” in this specification.

  According to the above-described configuration, the joining flange 43 provided on the third piece 22 for welding and the reinforcing rib 92 provided on the outer surface of the third piece 22 intersect each other. The hooking wall 51 provided on the welding jig 53 and on which the hooking portion 54 (see FIG. 24) of the welding jig 53 is hooked is divided between the reinforcing ribs 92 (see FIG. 23). Therefore, the hook wall 51 and the reinforcing rib 92 are independently formed, and compared with the case where the hook wall 51 and the reinforcing rib 92 are continuous, a large R-shaped inclined surface 93 is formed at the root portion of the reinforcing rib 92. The stress concentration on the root portion can be relaxed (see FIG. 23). When the hook wall 51 and the reinforcing rib 92 are continuous, only a small R-shaped inclined surface can be formed at the base of the reinforcing rib 92 for molding, and stress concentration tends to occur at the base. Although a problem arises, the problem can be improved by dividing the catching wall 51 between the reinforcing ribs 92.

[(3) Gas tank room]
The gas tank chamber will be described.
As shown in FIG. 12, on the front side of the manifold body 12, a gas tank chamber 95 as a volume portion for mixing blow-by gas is formed by joining the first piece 18 and the second piece 20 together. Yes. In addition, in each piece 18 and 20, the same code | symbol and 95 are attached | subjected to the part which comprises the gas tank chamber 95 (refer FIG.10 and FIG.19). 14 is a cross-sectional view taken along line XIV-XIV in FIG. 10, and FIG. 15 is a cross-sectional view taken along line XV-XV in FIG.
The gas tank chamber 95 has a horizontally long shape and has a bulging portion 96 that bulges downward at both left and right ends (see FIGS. 10 and 19).

  As shown in FIG. 12, in the 1st piece 18, the wall which forms each branch channel | path 28, and the wall which forms the gas tank chamber 95 are united. Specifically, the gas tank chamber 95 and the upper part of each branch passage 28 are adjacent to each other through a wall (reference numeral 97), and the wall 97 defines the wall and gas tank chamber 95 that form each branch passage 28. It corresponds to the wall to be formed (see FIGS. 14 and 15). Further, the surge tank chamber 24 and the gas tank chamber 95 are adjacent to each other vertically via a partition wall 98 formed by joining the first piece 18 and the second piece 20 (see FIGS. 12 and 14).

  As shown in FIG. 8, a blow-by gas introduction port 100 communicating with the gas tank chamber 95 is formed in the second piece 20. The blow-by gas introduction port 100 is formed so that the opening end is directed leftward (rightward in FIG. 19) in the left side portion of the second piece 20. Connected to the blow-by gas introduction port 100 is a downstream end of a blow-by gas pipe (not shown) in the PCV system that recirculates the blow-by gas from a crankcase (not shown) to the intake passage. As a result, blow-by gas is introduced from the blow-by gas introduction port 100 into the gas tank chamber 95.

  As shown in FIG. 10, the lower ends of the bulging parts 96 of the gas tank chamber 95 and the central part of the flow direction (vertical direction in FIG. The gas is distributed through the gas distribution passage 102 (see FIG. 15). The gas distribution passage 102 includes a horizontally long communication hole 104 penetrating in the front-rear direction at the lower end portion of each bulging portion 96 of the gas tank chamber 95 in the first piece 18, and the first piece 18 and the third piece. 22 and a branch path portion 106 that is formed by joining to the side wall 22 and extends in the left-right direction (see FIG. 14). In addition, in each piece 18 and 22, the same code | symbol and 106 are attached | subjected to the part which comprises the branched path part 106 (refer FIG.11 and FIG.20).

  As shown in FIG. 11, the communication hole portion 104 communicates with the central portion in the left-right direction of the branch path portion 106. Further, both end portions of the branch path portion 106 communicate with the central portion in the vertical direction of both branch passages 28 (see FIGS. 12, 15, and 20). Further, the connecting hole portion 104 and the branch passage portion 106 are formed in an inverted V shape that inclines downward from the central portion in the left-right direction toward both sides (see FIGS. 10 and 11). Moreover, the branch path part 106 is formed in the reverse V shape which inclines toward the rear side toward the both sides from the center part of the left-right direction (refer FIG.11 and FIG.20).

  According to the configuration described above, the blow-by gas introduced into the gas tank chamber 95 from the blow-by gas introduction port 100 is mixed in the gas tank chamber 95 and then passed through the communication hole portion 104 and the branch passage portion 106 of each gas distribution passage 102. Are distributed to each branch passage 28. Therefore, by introducing blow-by gas into the gas tank chamber 95 and mixing the blow-by gas in the gas tank chamber 95, the blow-by gas is distributed directly to each branch passage 28 without going through the surge tank chamber 24, thereby The distribution of gas to the passage 28 can be equalized. Further, since the blow-by gas does not pass through the surge tank chamber 24, the blow-by gas is not affected by the turbulent flow in the surge tank chamber 24 and can be evenly distributed to each branch passage 28. Note that the blow-by gas corresponds to the “gas that is reduced to the engine” in this specification. The gas introduced into the gas tank chamber 95 may be any gas that can be reduced to the engine, and can be replaced with a purge gas. Further, the gas introduced into the gas tank chamber 95 can be replaced with EGR gas.

  Further, the wall forming each branch passage 28 and the wall forming the gas tank chamber 95 are integrated, and the gas tank chamber 95 and the upper portion of each branch passage 28 are adjacent to each other through the wall 97 (see FIG. 12, 14 and 15). Therefore, the rigidity of the intake manifold 10 can be improved and the intake manifold 10 can be downsized as compared with the case where the wall forming each branch passage 28 and the wall forming the gas tank chamber 95 are formed separately. .

  Further, the surge tank chamber 24 and the gas tank chamber 95 are adjacent to each other through a partition wall 98 (see FIGS. 12 and 14). Therefore, as compared with the case where the surge tank chamber 24 and the gas tank chamber 95 are separated from each other, the rigidity of the intake manifold 10 can be improved and the intake manifold 10 can be downsized.

  Further, the branch passage portion 106 of the gas distribution passage 102 is formed in an inverted V shape that is inclined downward from the central portion in the left-right direction toward both sides (see FIGS. 11 and 20). Therefore, the blow-by gas flowing through the branch passage portions 106 of the gas distribution passage 102 can smoothly merge with the intake air flowing through the branch passages 28, and the intake air from the branch passages 28 to the branch passage portions 106 can be backflowed. Can be prevented.

[(4) Injection Gate for Resin Molding of First Piece 18]
An injection gate relating to resin molding of the first piece 18 will be described.
As shown in FIG. 10, the injection gate 108 at the time of resin molding of the first piece 18 includes two points at the lower end portion of the front wall portion in both the center side branch passages 28, and the front side center of the throttle mounting flange 32. It is set to 3 points in total with 1 point of the section. Then, by controlling the injection timing of the molten resin from each injection gate 108, a weld portion made of the molten resin filled from each injection gate 108 is formed at a position that is below the surge tank chamber 24 and the gas tank chamber 95. Is set to be.

  According to the above-described configuration, the throttle mounting flange 32 can be accurately formed by setting the injection gate 108 with respect to the throttle mounting flange 32 which is an important part. Further, since the weld portion is formed at a position that deviates below the surge tank chamber 24 and the gas tank chamber 95, a weld portion is formed on the annular wall portion that surrounds the surge tank chamber 24 where the volume is small and stress is easily concentrated. By avoiding this, it is possible to prevent molding failure of the annular wall portion and improve the strength. In addition, welding of the first piece 18 and the second piece 20 (or the third piece 22) is avoided by avoiding formation of a weld portion in the welding portion 44 of the surge tank chamber 24 and the gas tank chamber 95. Defects (bonding defects) can be prevented.

[(5) Hose clamp]
The hose clamp will be described.
As shown in FIG. 10, a C-shaped hose clamp 112 that opens forward is integrally formed on the outside of the right side wall portion of the surge tank chamber 24 of the first piece 18 (see FIG. 7). The hose clamp 112 elastically fits and holds a hot water hose 114 made of a rubber hose that connects the cooling water piping of the throttle body 17 of the throttle device 16 and the cooling water piping of the engine. Further, by sliding the slide mold provided in the mold for molding the first piece 18 in the vertical direction in FIG. 10, the hose clamp 112 can be formed simultaneously with the resin molding of the first piece 18. .

  As shown in FIG. 7, a C-shaped hose clamp 116 that opens to the front is integrally formed on the outside of the left side wall portion of the surge tank chamber 24 of the second piece 20. The hose clamp 116 elastically fits and holds the purge gas hose 74 that communicates the purge gas introduction port 69 and the purge control valve 75. 25 is a cross-sectional view taken along the line XXV-XXV in FIG.

  The mold for molding the second piece 20 is provided with slide molds for molding the purge gas introduction port 69 and the blow-by gas introduction port 100, respectively. The slide directions of these slide molds (the horizontal direction in FIG. 19) It is difficult to form the hose clamp 116 from the viewpoint of the mold structure by using a slide mold whose sliding direction is a direction intersecting with (). Therefore, in this embodiment, as shown in FIG. 25, the fixed die 118 for molding the rear surface side (lower surface side in FIG. 25) of the second piece 20 and the front surface side (upper surface side in FIG. 25) of the piece 20 are provided. A hose clamp 116 is formed by the movable mold 120 to be formed. That is, the hose clamp 116 has an undercut shape with respect to the movable mold 120, but the hose clamp 116 is formed by forcibly removing the hose clamp 116 from the movable mold 120 at the time of die cutting. . Thereby, the hose clamp 116 can be easily formed without using a slide mold.

[(6) Protective structure of positioning stay 35]
The protection structure of the positioning stay 35 will be described.
As shown in FIG. 26, the throttle mounting flange 32 is formed with a stand 122 that protrudes rearward (downward in FIG. 26) in parallel with the positioning stay 35. The stand 122 is formed with a protrusion height larger than the protrusion height (the amount of protrusion downward) of the positioning stay 35 with respect to the throttle mounting flange 32. Further, the stand 122 has a rigidity greater than that of the positioning stay 35.

Further, the intake manifold 10 (see FIGS. 1 to 4) before the throttle device 16 is mounted is placed on a placing table in the production line. FIG. 27 is a right side view showing the intake manifold mounted on the mounting table.
As shown in FIG. 27, the intake manifold 10 has a curved shape. For this reason, on the mounting table 124, the intake manifold 10 can be stably placed in the state where the third piece 22 side is directed downward than in the state where the second piece 20 side is directed downward. . In this case, the positioning pin 36 of the positioning stay 35 is held away from the mounting table 124 by contacting the mounting table 124 with the tip of the stand 122 as the lowest point. For this reason, the positioning stay 35 and / or the positioning pin 36 can be protected from deformation or breakage, and the assembly failure of the throttle body 17 to the throttle mounting flange 32 can be prevented.

  If the stand 122 is omitted, the positioning pin 36 of the positioning stay 35 comes into contact with the mounting table 124 (see the two-dot chain line 124 in FIG. 27) as the lowest point. Therefore, when a downward external force is applied to the intake manifold 10, the positioning stay 35 and / or the positioning pin 36 may be easily deformed or damaged, and as a result, the assembly of the throttle body 17 to the throttle mounting flange 32 may be poor. There is a risk of inconvenience. However, in this embodiment, as described above, the positioning stay 35 and / or the positioning pin 36 are protected by the stand 122, so that the above-described problem can be solved.

[(7) EGR gas distribution passage]
The EGR gas distribution passage will be described.
An EGR gas introduction port 126 is integrally formed at the left end of the connection flange 60 on the downstream side of the connection member 14 (see FIG. 2). A downstream end of an EGR gas pipe that guides recirculated exhaust gas (EGR gas) can be fastened to the EGR gas introduction port 126 with a bolt or the like. The EGR gas pipe is provided with an EGR valve including an electromagnetic control valve that adjusts the amount of EGR gas. In addition, an EGR gas distribution passage 128 that connects the EGR gas introduction port 126 and the communication passages 56 is formed between the joint surfaces of the downstream connection flange 60 and the cover flange 62. The EGR gas introduced from the EGR gas introduction port 126 is distributed to each communication passage 56 via the EGR gas distribution passage 128.

  According to the above-described configuration, the EGR gas distribution passage 128 is configured by joining the connection flange 60 and the cover flange 62 on the downstream side of the connection member 14, thereby using a dedicated distribution component that forms the EGR gas distribution passage 128. Unlike the case, it is possible to reduce the number of assembling steps and the number of parts between the distribution part and the intake manifold 10, and thus the manufacturing cost can be reduced. The EGR gas can be introduced not only into each communication passage 56 but also into the surge tank chamber 24 or each branch passage 28.

[(8) Fastening Structure of Manifold Body 12 and Connecting Member 14]
A fastening structure between the manifold body 12 and the connecting member 14 will be described.
As shown in FIG. 17, the connection flange 30 of the first piece 18 is formed with a plurality of (five in FIG. 17) collar attachment holes 130. The collar attachment hole 130 is formed between both ends of the connection flange 30 and the opening of the adjacent branch passage 28. The collar mounting hole 130 is disposed at the rear (lower part in FIG. 17) at both ends and the central part of the connection flange 30, and is disposed at the front (lower part in FIG. 17) between the both ends and the central part. Yes.

  As shown in FIG. 18, a plurality (five in FIG. 18) of screw holes 134 are formed in the connecting flange 58 on the upstream side of the connecting member 14 by screw hole processing. Each screw hole 134 is formed to be concentrically corresponding to each collar mounting hole 130.

A method for fastening the manifold body 12 and the connecting member 14 will be described. 5 is a cross-sectional view taken along line VV in FIG. 1, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.
As shown in FIGS. 5 and 6, each collar mounting hole 130 is provided with a metal cylindrical collar 132 concentrically. Then, at the rear portion of the connection flange 30, the headed bolt 136 is tightened into the screw hole 134 of the connection flange 58 in a state where the head bolt 136 is inserted into the collar 132 (see FIG. 5). Further, at the front portion of the connection flange 30, after the stud bolt 138 is inserted into the collar 132, the nut 139 is tightened to the stud bolt 138 after being tightened to the screw hole 134 of the connection flange 58 (see FIG. 6). ).

  As described above, the manifold body 12 (specifically, the connecting flange 30 of the first piece 18) and the connecting member 14 (specifically, the connecting flange 58) are fastened (see FIGS. 1 and 2). Since the first piece 18 is a resin molded product, the pitch between the shaft centers of the collar mounting holes 130 is likely to vary due to molding shrinkage of the connection flange 30, differences in thermal expansion, and the like, so as to absorb the variation. A head bolt 136 (specifically a shaft portion) and a stud bolt 138 are loosely inserted into the collar 132 (see FIGS. 5 and 6). The bolt 136 and / or the stud bolt 138 are selectively used as appropriate, and are not limited to the examples.

[(9) Positioning structure of manifold body 12 and connecting member 14]
A positioning structure between the manifold body 12 and the connecting member 14 will be described.
As shown in FIG. 17, a pair of left and right reference pins 142 and 141 are integrally formed on the end face of the connection flange 30 of the first piece 18. Both reference pins 141 and 142 are arranged at the rear part between the both end parts and the central part of the connection flange 30. One (right side in FIG. 17) reference pin 141 is a cylindrical main reference pin 141. Further, the other (left side in FIG. 17) reference pin 142 is a sub-reference pin 142 having a long cylindrical shape. The major axis direction of the auxiliary reference pin 142 is directed to the short direction of the connection flange 30, that is, the front-rear direction (vertical direction in FIG. 17), and the minor axis direction is directed to the longitudinal direction of the connection flange 30, that is, the left-right direction. . Both the reference pins 141 and 142 can be formed by attaching a pin member formed separately from the first piece 18 to the connection flange 30 of the first piece 18 by press fitting or the like.

  As shown in FIG. 18, a pair of left and right reference holes 145 and 144 are formed in a round hole shape in the connecting flange 58 on the upstream side of the connecting member 14 by drilling with a drill. One (right side in FIG. 18) reference hole 144 is formed as a main reference hole 144 into which the main reference pin 141 (see FIG. 17) can be inserted concentrically. The other (left side in FIG. 18) reference hole 145 is formed as a sub reference hole 145 into which the sub reference pin 142 (see FIG. 17) can be inserted. The diameter of the sub reference hole 145 is formed to be slightly larger than the major diameter of the sub reference pin 142, and the sub reference pin 142 can be inserted in a state of absorbing displacement, that is, loosely fitted.

  When the manifold body 12 (specifically, the connecting flange 30 of the first piece 18) and the connecting member 14 (specifically, the connecting flange 58) are fastened, they are connected to both reference holes 144, 145 (see FIG. 18) of the connecting flange 58. Both reference pins 141 and 142 (see FIG. 17) of the flange 30 are inserted. By inserting the main reference pin 141 into the main reference hole 144, main positioning is performed. In addition, the secondary reference pin 142 is inserted into the secondary reference hole 145 to perform secondary positioning. At this time, a large amount was absorbed in the minor diameter direction of the auxiliary reference pin 142, that is, the longitudinal direction of the connection flange 30, and a small deviation amount was absorbed in the major axis direction of the auxiliary reference pin 142, that is, the lateral direction of the connection flange 30. In this state, positioning between the two 142 and 145 is performed.

  According to the configuration described above, the reference flanges 141 and 142 that can be inserted into the round hole-shaped reference holes 144 and 145 of the metal connection flange 58 are provided on the connection flange 30 of the first piece 18 made of resin, One reference pin 141 is a cylindrical main reference pin 141, the other reference pin 142 is a long cylindrical sub reference pin 142, and the major axis direction of the sub reference pin 142 intersects the longitudinal direction of the connection flange 30. . Therefore, even when the variation in pitch dimension between the reference pins 141 and 142 of the connection flange 30 of the first piece 18 made of resin is large, the main reference pin 141 and the reference hole 144 corresponding to the pin 141 are fitted to each other. As a result, both 141 and 144 are positioned concentrically, and by fitting the sub-reference pin 142 with the reference hole 145 corresponding to the pin 142, the connecting flange 30 is increased in amount in the longitudinal direction (variation). ) And the distance between the two 142 and 145 can be determined in a state where a small amount of deviation (variation) is absorbed in the short direction of the connection flange 30. Thereby, the positioning accuracy of the connection flange 30 and the connection flange 58 can be improved. As a result, the generation | occurrence | production of the level | step difference between the end surfaces of each branch channel | path 28 and each connection channel | path 56 which arises between the connection flange 30 and the connection flange 58 can be reduced.

  In addition, the circular reference holes 144 and 145 can be formed in the metal (aluminum die cast) connecting member 14 by drilling. For this reason, both the reference holes 144 and 145 can be formed in the metal connecting member 14 with high accuracy at low cost. The positioning structure is not limited to the embodiment described above, and can be applied as a positioning structure for resin products with respect to various metal products. Further, positioning between various metal products or between various resin products is possible. It can also be applied as a structure.

[(10) Negative pressure extraction passage]
The negative pressure extraction passage will be described.
The manifold body 12 is provided with a negative pressure extraction passage 147 for extracting the negative pressure of the surge tank chamber 24 (see FIGS. 10 and 19). 16 is a cross-sectional view taken along line XVI-XVI in FIG.
As shown in FIG. 16, the negative pressure extraction passage 147 is configured by joining the first piece 18 and the second piece 20. Further, the negative pressure extraction passage 147 is provided at one of the two protruding portions 148 (the right side in FIG. 10) extending from both the left and right ends of the surge tank chamber 24 so as to be adjacent to the left and right sides of the gas tank chamber 95. The overhanging portion 148 and a negative pressure extraction port 149 provided in the second piece 20 are provided (see FIG. 19). The overhanging portion 148 is partitioned by the mouth edge 151 of the entrance of the right branch passage 28 and the shielding wall 152 formed on the rear side of the second piece 20 so as to align with the mouth edge. Thus, a negative pressure chamber 148 (the same reference numeral as that of the overhanging portion) is provided. Further, a communication port 153 that connects the surge tank chamber 24 and the negative pressure chamber 148 is formed by the mouth edge portion 151 and the shielding wall 152. For this reason, the negative pressure chamber 148 is formed as a dead space in which there is almost no flow of intake air.

  The negative pressure take-out port 149 communicates with the negative pressure chamber 148 at the right side of the second piece 20 and is formed so that the open end is directed rightward (leftward in FIG. 19). . An upstream end of a negative pressure extraction pipe 155 connected to a brake booster (not shown) is connected to the negative pressure extraction port 149. As a result, the intake negative pressure generated in the surge tank chamber 24 is taken out by the brake booster.

  According to the configuration described above, the negative pressure extraction port 149 communicates with the negative pressure chamber 148 partitioned from the surge tank chamber 24 by the shielding wall 152 (see FIG. 19). As a result, the flow of moisture generated by condensation in the surge tank chamber 24 is blocked by the shielding wall 152, and freezing, condensation, etc. are generated in the negative pressure extraction pipe 155 due to water flowing into the negative pressure extraction pipe 155. Can be prevented. In addition, it is possible to prevent deposits from entering the negative pressure extraction pipe 155 from the surge tank chamber 24 and to prevent deposits from adhering to the negative pressure extraction pipe 155. Thereby, insufficient supply of negative pressure to the brake booster can be prevented.

[(11) Purge control valve 75 mounting structure]
A mounting structure of the purge control valve 75 will be described.
As shown in FIG. 20, a valve mounting arm 157 that protrudes leftward is integrally formed outside the left side wall of the left branch passage 28 of the third piece 22. FIG. 28 is a front view showing a purge control valve mounting portion, and FIG. 29 is a side view of the same.
As shown in FIG. 29, a nut mounting hole 158 is formed in the distal end surface of the valve mounting arm 157. A nut member 160 is concentrically attached to the nut attachment hole 158 by hot press fitting or the like. Further, a detent piece 162 is integrally formed on one side portion (lower side portion in FIG. 28) of the distal end surface of the valve mounting arm 157. The first piece 18 is formed with an arm reinforcing rib 164 corresponding to the front side of the valve mounting arm 157 (see FIG. 10). The arm reinforcing rib 164 reinforces the valve mounting arm 157 by being welded to the valve mounting arm 157 simultaneously with the welding of the third piece 22 to the first piece 18 (see FIG. 7). As shown in FIG. 28, the purge control valve 75 is fastened by a bolt or the like that is fastened to the nut member 160 in a state in which the purge control valve 75 is prevented from being rotated by the anti-rotation piece 162 with respect to the distal end surface of the valve mounting arm 157. Installed by. Further, a U-shaped groove-shaped concave groove portion 166 extending along the anti-rotation piece 162 is formed at the root portion on the inner side (upper side in FIG. 28) of the anti-rotation piece 162 on the distal end surface of the valve mounting arm 157 ( (See FIG. 29). The recessed groove portion 166 is formed in a semicircular cross section having a groove width of 2 mm and a groove radius of 1 mm, for example.

  With this configuration, both surfaces 168 and 169 forming a corner formed by the lower surface 168 and the right side surface 169 of the purge control valve 75 are brought into close contact with the tip surface of the valve mounting arm 157 and the upper surface of the rotation stopper piece 162. Can do. For example, when there is no concave groove portion 166 and an R-shaped inclined surface for securing the strength of the rotation stopper piece 162 is formed at a corner formed by the tip surface of the valve mounting arm 157 and the rotation stopper piece 162, When the corner of the purge control valve 75 interferes with the inclined surface, both surfaces 168 and 169 forming the corner of the purge control valve 75 are brought into close contact with the tip surface of the valve mounting arm 157 and the rotation stopper 162. Therefore, the anti-rotation effect of the purge control valve 75 is reduced. However, as described above, by forming the concave groove portion 166 at the root portion of the anti-rotation piece 162 on the distal end surface of the valve mounting arm 157, both surfaces 168 and 169 forming the corner portions of the purge control valve 75 are provided. The valve mounting arm 157 can be brought into close contact with the distal end surface and the non-rotating piece 162, and the anti-rotation effect of the purge control valve 75 can be improved. In addition, since the concave groove portion 166 of the U-shaped groove formed at the root portion of the rotation stopper piece 162 on the tip surface of the valve mounting arm 157 forms an R-shaped inclined surface for ensuring the strength of the rotation stopper piece 162. The strength of the anti-rotation piece 162 can also be improved.

  When the intake manifold 10 is mounted on the engine, the gas flow path in the purge control valve 75 is arranged at a position higher than the purge gas introduction port 69 and the canister 76. Thereby, it is possible to prevent the purge gas from remaining in the gas flow path in the purge control valve 75 when the engine is stopped.

[(12) Pressure extraction passage]
The pressure extraction passage will be described.
As shown in FIG. 10, the manifold body 12 is provided with a pressure extraction passage 171 for extracting the pressure of the surge tank chamber 24. The pressure extraction passage 171 is configured by joining the first piece 18 and the second piece 20. Moreover, in each piece 18 and 20, the same code | symbol and 171 are attached | subjected to the part which comprises the pressure extraction channel | path 171 (refer FIG.10 and FIG.19). Further, the pressure extraction passage 171 has an inverted L-shape adjacent to the right side of the upstream-side passage portion 70 along the joining surface which is a division surface of the upper wall portion of the first piece 18 and the second piece 20. The two pieces 18 and 20 are joined to form an L-shaped tube. The lower end portion of the pressure extraction passage 171 is in communication with the surge tank chamber 24. Further, the second piece 20 is formed with a pressure outlet 179 communicating with the upper end portion of the pressure outlet passage 171. A peripheral portion of the pressure outlet 179 of the second piece 20 is a sensor mounting portion 180 (see FIG. 7).

  A pressure sensor 182 can be fastened to the sensor mounting portion 180 by fastening a bolt or the like (see FIGS. 1 to 3). At this time, the detector of the pressure sensor 182 is fitted into the pressure outlet 179. Therefore, the pressure in the surge tank chamber 24 is detected by the pressure sensor 182 through the pressure extraction passage 171. An electronic control unit (ECU) to which a detection signal from the pressure sensor 182 is input monitors the pressure in the surge tank chamber 24, and surges occur when the EGR valve provided on the EGR gas passage is opened and closed. A difference in pressure in the tank chamber 24 is obtained. If the pressure difference is equal to or greater than a predetermined value, it is determined to be normal, and if the pressure difference is less than the predetermined value, it is determined that the EGR valve has failed. Further, since a bent pressure extraction passage 171 having a predetermined passage length is set between the surge tank chamber 24 and the pressure sensor 182, impurities such as oil mist from the surge tank chamber 24 to the pressure sensor 182 Intrusion can be prevented.

[Example 2]
A second embodiment of the present invention will be described. This embodiment is a modification of the first embodiment. Further, in the embodiments after the second embodiment, the same reference numerals are given to the portions considered to be the same as or substantially the same as those of the first embodiment, and the duplicate description is omitted. 30 is a front view showing the manifold body, FIG. 31 is a sectional view taken along the line XXXI-XXXI in FIG. 30, and FIG. 32 is a sectional view taken along the line XXXII-XXXII in FIG.
As shown in FIGS. 30 to 31, in this embodiment, the purge gas passage 68, the gas tank chamber 95, and the negative pressure chamber 148 in the first embodiment are omitted, so that the volume of the surge tank chamber 24 is increased. Accordingly, the purge gas introduction port 69 and the blow-by gas introduction port 100 are integrally formed with the first piece 18 instead of the second piece 20. Further, in this embodiment, the pressure take-out passage 171, the sensor mounting portion 180, and the pressure sensor 182 in the first embodiment are omitted. The upstream portion of each branch passage 28 is formed by a hollow tubular inlet pipe portion 184 that projects into the surge tank chamber 24. The inlet pipe portion 184 extends to the central portion of the surge tank chamber 24 in the vertical direction, and the upper end portion thereof is expanded upward in a funnel shape. The interval between the inlet pipe 184 and the front side wall (symbol, 187) of the surge tank chamber 24 is the same as that between the inlet pipe 184 and the rear side wall (symbol, 188) of the surge tank chamber 24. It is larger than the interval between.

  The second piece 20 has a front side wall portion 187 that closes the front opening of the surge tank chamber 24. In addition, lattice-like ribs 190 are formed on the outer side surface, that is, the front surface of the front side wall portion 187 of the surge tank chamber 24 (see FIGS. 30 and 31). Therefore, the strength of the front side wall portion 187 of the surge tank chamber 24 can be improved by forming the grid-like ribs 190. The third piece 22 has a rear side wall portion 188 that closes the rear surface opening of the surge tank chamber 24. In addition, lattice-like ribs 192 are formed on the outer side surface, that is, the rear surface of the rear side wall portion 188 of the surge tank chamber 24 (see FIG. 31). Therefore, the strength of the rear side wall portion 188 of the surge tank chamber 24 can be improved by forming the grid-like ribs 192.

  As shown in FIG. 32, the intake air flowing into the surge tank chamber 24 from the intake inlet 33 of the throttle mounting flange 32 has a high flow velocity flowing from the intake inlet 33 side through the surge tank chamber 24 toward each branch passage 28. A main flow Y1 and a turbulent flow Y2 flowing in a dead space between the inlet pipe portion 184 of each branch passage 28 and the front side wall portion 187 of the surge tank chamber 24 are generated. The turbulent flow Y2 may impair the equalization of the intake air distribution to each branch passage 28. Therefore, in this embodiment, the intake turbulent flow Y2 is smoothly guided to the main flow Y1 between the upper half portion of the inlet pipe portion 184 of each branch passage 28 and the front side wall portion 187 of the surge tank chamber 24. A rectifying plate 194 is installed. Accordingly, the turbulent flow Y2 of the intake air in the surge tank chamber 24 is smoothly guided to flow into the main flow Y1 by the rectifying plate 194 (see arrow Y3 in FIG. 32). Thereby, the distribution of the intake air to each branch passage 28 can be equalized. As a result, engine output can be improved.

[Example 3]
A third embodiment of the present invention will be described. This embodiment is a modification of the second embodiment. 33 is a front view showing the manifold body, FIG. 34 is a sectional view taken along the line XXXIV-XXXIV in FIG. 33, and FIG. 35 is a sectional view taken along the line XXXV-XXXV in FIG.
As shown in FIGS. 33 to 35, in this embodiment, the rectifying plate 194 in Embodiment 2 is omitted. A sensor mounting portion 180 is provided at the lower left portion of the front side wall portion 187 of the second piece 22.

  Honeycomb ribs 196 are formed on the outer surface, that is, the front surface of the front side wall portion 187 of the surge tank chamber 24 instead of the lattice ribs 190. Therefore, the strength of the front side wall portion 187 of the surge tank chamber 24 can be improved by forming the honeycomb-shaped rib 196. In addition, honeycomb-shaped ribs 198 are formed on the outer side surface, that is, the rear surface of the rear side wall portion 188 of the surge tank chamber 24 in place of the lattice-shaped ribs 192 (see FIG. 34). Therefore, the formation of the honeycomb rib 198 can improve the strength of the rear side wall portion 188 of the surge tank chamber 24.

  The honeycomb-shaped ribs 196 and 198 relieve concentrated stress because the force transmission is radial compared to the lattice-shaped ribs 190 and 192, and the pressure resistance of the side wall portions 187 and 188 before and after the surge tank chamber 24 is reduced. Strength can be improved. The honeycomb-shaped ribs 196 and 198 are also effective in reducing the vibration of the side wall portions 187 and 188 of the surge tank chamber 24. In addition, the honeycomb-shaped ribs 196 and 198 can be formed with a larger area of one section even when the circumferential length of the rib required to form one section is the same as that of the lattice-shaped ribs 190 and 192. The cost can be reduced. Further, the honeycomb-shaped ribs 196 and 198 have a good appearance and can improve the design as compared with the lattice-shaped ribs 190 and 192.

[Example 4]
Embodiment 4 of the present invention will be described. This embodiment is a modification of the first embodiment. 36 is a cross-sectional view showing a fastening structure using a head bolt, and FIG. 37 is a cross-sectional view showing a fastening structure using a stud bolt.
As shown in FIGS. 36 and 37, in this embodiment, the fastening structure (see FIGS. 5 and 6) of the connection flange 30 of the manifold body 12 to the connection flange 58 of the connection member 14 in the first embodiment is made of resin. It is changed to the fastening structure between the flanges.
As with the connection flange 30, a collar mounting hole 130 is formed in one of the resin flanges 200 (referred to as “collar side flange”). The collar mounting hole 130 is provided with a metal cylindrical collar 132 concentrically. Further, a nut mounting hole 204 is formed in the other resin flange (referred to as a “nut-side flange”) 202. A metal nut member 206 is concentrically attached to the nut attachment hole 204 by hot press fitting or the like. The nut member 206 includes a nut portion 207 that forms a main body thereof, and a receiving flange 208 that is formed in a flange shape on the outer peripheral portion of the collar side end portion of the nut portion 207. The seat flange 208 has an outer diameter larger than the outer diameter of the collar 132, and the seat surface diameter with respect to the collar 132 is enlarged. The outer diameter of the receiving flange 208 is such that even if the headed bolt 136 (specifically, the shaft portion) and the stud bolt 138 are in the maximum misalignment with respect to the collar 132, the collar 132 has the receiving flange 208 of the nut member 206. The outer diameter is set so as to contact the entire circumference.

[Fastening structure of both flanges 200 and 202 with a head bolt 136]
As shown in FIG. 36, the flanges 200 and 202 are fastened by tightening the bolts 136 with the head bolts 136 to the nut members 206 of the flanges 202 on the nut side while being inserted into the collars 132 of the flanges 200 on the collar side. .

[Fastening structure of both flanges 200, 202 by stud bolt 138]
As shown in FIG. 37, the stud bolt 138 is tightened to the nut member 206 of the nut side flange 202 in a state where the stud bolt 138 is inserted into the collar 132 of the collar side flange 200, and the nut 139 is tightened to the stud bolt 138. Both flanges 200 and 202 are fastened.

  In the fastening structure between the resin flanges 200 and 202, the center of the flange 132 and the nut member 206 are likely to be misaligned due to molding shrinkage and thermal expansion difference of the flanges 200 and 202, and the variation is absorbed. The head bolt 136 (specifically, the shaft portion) and the stud bolt 138 are loosely inserted into the collar 132. Assuming that the receiving flange 208 of the nut member 206 is omitted, when the headed bolt 136 (specifically, the shaft portion) and the stud bolt 138 are in a maximum misalignment with respect to the collar 132, the collar 132 Since a part is removed from the nut portion 207, the collar 132 cannot abut on the nut portion 207 over the entire circumference. Thereby, a shearing force is applied to the press-fit interface of the nut portion 207 with respect to the nut-side flange 202 at the time of fastening, which may cause a problem that the nut portion 207 comes off from the flange 202.

  However, according to the nut member 206 having the receiving flange 208, even if the head bolt 136 (specifically, the shaft portion) and the stud bolt 138 are in the maximum misalignment state with respect to the collar 132, the collar 132 is not attached to the nut member 206. It can abut on the seat flange 208 over the entire circumference. For this reason, a shearing force is not applied to the press-fit interface of the nut portion 207 with respect to the nut-side flange 202 during fastening, and the nut portion 207 can be prevented from coming off from the flange 202. In addition, the fastening structure of a present Example is not restricted to the said Example, It is possible to apply also as a fastening structure of various resin flanges.

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the above-described embodiment is merely an example, and does not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the embodiments. Further, the technology described in this specification or the drawings exhibits technical usefulness alone or in various combinations, and is not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in the present specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects. The intake manifold of the present invention can be applied to an engine having a number of cylinders other than the in-line four cylinders. In the above embodiment, the intake manifold constituted by the resin manifold main body and the metal connecting member is exemplified, but the intake manifold constituted by the resin manifold main body and the resin connecting member, or The present invention can also be applied to an intake manifold made entirely of resin. Moreover, in the said Example, although the manifold main body was divided into 3, it can also divide | segment into 2 divisions or 4 divisions or more.

10 ... Intake manifold 24 ... Surge tank chamber 28 ... Branch passage 95 ... Gas tank chamber 97 ... Wall 98 ... Bulkhead

Claims (5)

An intake manifold having a surge tank chamber and a plurality of branch passages,
An intake manifold comprising a gas tank chamber for introducing a gas to be reduced into the engine and distributing the gas to the plurality of branch passages. The intake manifold according to claim 1,
An intake manifold, wherein the gas introduced into the gas tank chamber is blow-by gas. The intake manifold according to claim 1,
An intake manifold, wherein the gas introduced into the gas tank chamber is a purge gas. The intake manifold according to any one of claims 1 to 3,
An intake manifold, wherein a wall forming the plurality of branch passages and a wall forming the gas tank chamber are integrated. The intake manifold according to any one of claims 1 to 4,
The intake manifold is characterized in that the surge tank chamber and the gas tank chamber are adjacent to each other through a partition wall.

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