JP5948884B2 - Engine intake system - Google Patents

Description

  The present invention relates to an intake device for an engine having a plurality of cylinders arranged in a row, and more particularly to an intake device for an engine in which a water-cooled intercooler is combined with an intake manifold.

  In an internal combustion engine, the lower the intake air temperature at the same pressure, the greater the intake mass per unit volume (the higher the charging efficiency), and more fuel can be burned. In order to increase the charging efficiency, an intercooler for cooling the air compressed by the supercharger is required.

  Such an intercooler is preferably a water-cooled type rather than an air-cooled type from the viewpoint of cooling efficiency, and is incorporated in an intake system member from the viewpoint of space saving in an engine room for improving the comfort in the vehicle compartment. Is desirable. For example, Patent Document 1 discloses that a water-cooled intercooler is built in an intake manifold, and intake air cooled by the intercooler is directly supplied to a branch pipe. According to this Patent Document 1, since it is not necessary to separately arrange an intercooler in the engine room, it is advantageous in terms of space saving in the engine room as compared with the case where the intercooler is not built in the intake manifold. Become.

  On the other hand, with respect to the intake system, it is preferable that the intake manifold is made of resin from the viewpoint of reducing the weight of the engine. The EGR gas is preferably returned to the intake system. However, if the EGR gas introduction pipe is connected to the resin intake manifold, high temperature EGR gas is introduced into the resin intake manifold, which causes a problem in terms of durability and reliability of the intake manifold.

  In order to solve such a problem, for example, in Patent Document 2, an exhaust gas recirculation passage is connected to an intake passage of a resin-made intake manifold, and all of the intake passage is disposed in the vicinity of the opening of the exhaust gas recirculation passage. An engine intake device in which a heat insulating member is disposed so as to cover the periphery is disclosed.

German Patent Publication DE102007030464A1 No. 04-5720

  By the way, when the EGR gas is recirculated to the intake manifold of Patent Document 1, it is conceivable to connect an EGR gas introduction pipe downstream of the intercooler in order to suppress deterioration of the intercooler due to the EGR gas. In such a structure, the durability and reliability of the intake manifold may be impaired by the high-temperature EGR gas, and in Patent Document 1, the intake air cooled by the water-cooled intercooler is directly supplied to the branch pipe. As a result, there is little chance of mixing the intake air and the EGR gas, and there is a possibility that the cylinder distribution of the EGR gas may be impaired.

  Moreover, in the thing of patent document 2, while arrange | positioning a heat insulation member so that the perimeter of an intake passage may be covered, there exists a possibility of causing a raise in manufacturing cost, and it is substantially opposite to the opening part of the exhaust gas recirculation passage in an intake passage. Since it is assumed that the EGR gas is applied to the part to be discharged, the mixing property between the intake air and the EGR gas is lowered depending on the position of the intake main flow in the intake passage and the intake flow rate, and the cylinder distribution of the EGR gas May be damaged.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an intake air cooling property and an EGR gas mixing property in an engine intake device in which a water-cooled intercooler is combined with an intake manifold of the engine. It is to provide a technology for improving the heat resistance of the intake manifold at a low cost.

  In order to achieve the above object, in the engine intake device according to the present invention, an EGR gas introduction pipe is connected to an intermediate intake pipe section that is a single passage that communicates the chamber section and the downstream branch pipe section, A heat-resistant inner layer is provided on a surface along which the main intake air flows in the inner surface of the intermediate intake pipe portion.

  Specifically, the first invention is directed to an engine intake device in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row.

The intake manifold is disposed on the outer surface of the intake side, which is one side in the width direction of the engine, and is disposed on the downstream side of the upstream intake pipe portion. An intermediate intake air that forms a single passage that extends in the vertical direction in the engine width direction and communicates with the downstream branch pipe portion that communicates with each of the cylinders on the downstream side, and the chamber portion and the downstream branch pipe portion. The intercooler has an intercooler main body built in the chamber portion so as to bisect the inside of the chamber portion in the engine width direction, and is bisected in the engine width direction. The upstream intake pipe communicates with a space located on the side of the chamber close to the engine, and the air of the chamber divided into two in the engine width direction. The intermediate intake pipe portion communicates with a space located on the side away from the gin, and the air sucked into the upstream intake pipe portion is located on the side closer to the engine in the chamber portion from the upstream intake pipe portion. Introduced into the space, introduced into the space located on the side away from the engine through the intercooler main body from the space, and from the space to the downstream branch pipe through the intermediate intake pipe An EGR gas introduction pipe is connected to the outer wall portion, which is a portion on the outer side in the engine width direction of the intermediate intake pipe portion, and the intake manifold is made of resin. The main body portion and at least the outer wall portion of the intermediate intake pipe portion are welded to the main body portion and the divided resin divided structure, and the inner portion of the outer wall portion of the intermediate intake pipe portion is welded. On the side, it is characterized in that the heat-resistant inner layer which constitutes the wall surface of the internal passage of the intermediate suction pipe portion is arranged.

According to the first aspect of the invention, the intake air introduced from the upstream intake pipe portion into the space portion on the side close to the engine in the chamber portion passes through the intercooler body portion in the engine width direction and is a space on the side away from the engine. is introduced into the section, everywhere in the downstream branch pipe portion by increasing the intermediate intake pipe section from the space portion, since the intermediate suction pipe portion is curved outwardly engine width direction, when the intake air flow rate is small, the intake The flow rises along the outer wall portion, which is a portion on the outer side in the engine width direction in the intermediate intake pipe portion (while being biased toward the outer circumferential circle in the intermediate intake pipe portion). Then, since the EGR gas introduction pipe is connected to the outer wall portion of the intermediate intake pipe portion, the EGR gas introduced near the outer wall portion rises along the outer wall portion of the intermediate intake pipe portion. This makes it easy to mix with the intake air flow that has been made, so that the mixing properties of the EGR gas can be improved. Note that when the intake air flow rate is large, the intake flow flows in the intermediate intake pipe portion while spreading inward in the intermediate intake pipe portion, and naturally, the mixing property of EGR gas can be improved.

  Here, since the EGR gas introduced from the EGR gas introduction pipe is high temperature and the intake manifold is made of resin, the wall surface of the internal passage of the intermediate intake pipe portion into which the high temperature EGR gas is introduced is Although some heat resistance treatment is required, the EGR gas is introduced in the vicinity of the outer wall portion, and the inside of the intermediate intake pipe portion is mainly mixed with the intake air flow in the vicinity of the outer wall portion. Applying heat resistance treatment to all the wall surfaces in the passage causes unnecessary cost increase.

  Therefore, in the first invention, as the intake manifold, a resin main body portion and a resin divided structure that includes at least the outer wall portion of the intermediate intake pipe portion and is divided from the main body portion are welded. While being used, a heat resistant inner layer constituting the wall surface of the internal passage of the intermediate intake pipe portion is disposed on the inner surface side of the outer wall portion in the divided structure. In this way, the heat resistance of the intake manifold is improved while suppressing unnecessary costs by forming a heat-resistant inner layer on the part that requires heat-resistant treatment, that is, the inner surface of the outer wall. In addition, by adopting such a divided structure, the heat-resistant inner layer can be easily formed on the inner surface side of the outer wall portion constituting a part of the inner passage (intake passage).

  In addition, since the EGR gas introduction pipe is connected to the outer wall part of the intermediate intake pipe part that communicates the chamber part and the downstream branch pipe part, the EGR gas is introduced downstream of the intercooler. The soot contained in the EGR gas can suppress the deterioration of the performance of the intercooler.

  As described above, in the engine intake device in which the water-cooled intercooler is combined with the intake manifold, the heat resistance of the intake manifold can be improved at a low cost while improving the intake cooling performance and the EGR gas mixing performance.

According to a second aspect of the present invention, there is provided an engine intake system in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row. The intake manifold is on one side in the width direction of the engine. A chamber portion that is disposed on the outer surface of the intake side and is disposed on the downstream side of the upstream intake pipe portion, and accommodates the intercooler; and a downstream branch pipe portion that communicates with the cylinders on the downstream side of the chamber portion; An intermediate intake pipe section that communicates the chamber section and the downstream branch pipe section and that forms a single passage that is curved outward in the engine width direction and extends in the vertical direction, and the engine in the intermediate intake pipe section An EGR gas introduction pipe is connected to an outer wall portion that is a portion on the outer side in the width direction, and the intake manifold further includes a resin-made main body portion and at least the intermediate intake air. The main body portion and the divided resin divided structure including the outer wall portion of the portion are welded, and on the inner surface side of the outer wall portion of the intermediate intake pipe portion, the intermediate intake pipe portion A heat-resistant inner layer constituting the wall surface of the internal passage is disposed, and the heat-resistant inner layer is formed of a resin molded body having a wall shape that matches the shape of the wall surface in the internal passage of the intermediate intake pipe portion, It is characterized in that it is sandwiched between these two members inside the welded portion between the outer wall portion of the intermediate intake pipe portion and the main body portion.

  According to the second invention, since an inexpensive resin molded body is used as the heat resistant inner layer, the manufacturing cost of the intake manifold can be further reduced.

  Also, the heat resistant inner layer is sandwiched between these two members inside the welded portion between the outer wall portion of the intermediate intake pipe and the main body portion, so that the heat resistant inner layer is fixed to the outer wall portion, etc. It is possible to assemble at the same time as the welding of the main body portion and the divided structure without providing a separate means.

According to a third aspect of the present invention, there is provided an engine intake device in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row. The intake manifold is on one side in the width direction of the engine. A chamber portion that is disposed on the outer surface of the intake side and is disposed on the downstream side of the upstream intake pipe portion, and accommodates the intercooler; and a downstream branch pipe portion that communicates with the cylinders on the downstream side of the chamber portion; An intermediate intake pipe section that communicates the chamber section and the downstream branch pipe section and that forms a single passage that is curved outward in the engine width direction and extends in the vertical direction, and the engine in the intermediate intake pipe section An EGR gas introduction pipe is connected to an outer wall portion that is a portion on the outer side in the width direction, and the intake manifold further includes a resin-made main body portion and at least the intermediate intake air. The main body portion and the divided resin divided structure including the outer wall portion of the portion are welded, and on the inner surface side of the outer wall portion of the intermediate intake pipe portion, the intermediate intake pipe portion A heat-resistant inner layer constituting the wall surface of the internal passage is disposed , and is introduced from the EGR gas introduction pipe to the inside of the intermediate intake pipe portion where the EGR gas introduction pipe is connected. Collision wall members for causing EGR gas to collide and disperse EGR gas in a direction substantially perpendicular to the introduction direction thereof are provided so as to be located at a substantially intermediate position of the internal passage of the intermediate intake pipe portion. It is characterized by.

  According to the third aspect of the present invention, the collision wall member for causing the EGR gas introduced from the EGR gas introduction pipe to collide is provided inside the portion where the EGR gas introduction pipe is connected in the intermediate intake pipe portion. Therefore, it is possible to suppress the high-temperature EGR gas from colliding with the inner wall portion of the main body portion facing the outer wall portion, thereby suppressing the thermal deterioration of the main body portion.

  In addition, since the collision wall member disperses the EGR gas in a direction substantially orthogonal to the introduction direction and is located at an intermediate position of the internal passage of the intermediate intake pipe portion, in other words, in the internal passage Since the EGR gas is dispersed at least on the outer wall portion side with respect to the intermediate position, it is possible to further improve the mixing property between the main flow of the intake air flow rising along the outer wall portion and the EGR gas.

According to the engine intake device of the first aspect of the present invention, the intake air introduced from the upstream intake pipe portion into the space portion on the side close to the engine in the chamber portion passes through the intercooler body portion in the engine width direction from the engine. It is introduced into the space part on the far side, and ascends in the intermediate intake pipe part from the space part and reaches the downstream branch pipe part. The intermediate intake pipe part communicating the chamber part and the downstream branch pipe part is the engine width direction. Since the airflow is curved outward, the intake flow rises along the outer wall portion of the intermediate intake pipe portion and is easily mixed with the EGR gas introduced in the vicinity of the outer wall portion. Can be increased.

Further, as the intake manifold, a resin main body portion and a resin divided structure including at least the outer wall portion of the intermediate intake pipe portion are welded, and the outside which particularly needs to be subjected to heat resistance treatment By disposing a heat-resistant inner layer that forms the wall surface of the internal passage of the intermediate intake pipe part on the inner surface side of the wall part, the heat resistance of the intake manifold can be improved while suppressing unnecessary cost increase. By adopting such a divided structure, the heat-resistant inner layer can be easily formed on the inner surface side of the outer wall portion constituting a part of the internal passage.
According to the second invention, the heat-resistant inner layer is formed of a resin molded body having a wall shape that matches the shape of the wall surface in the internal passage of the intermediate intake pipe portion, and an inexpensive resin molded body is used as the heat-resistant inner layer. Since it uses, the manufacturing cost of an intake manifold can be suppressed further. Further, since the heat-resistant inner layer is sandwiched between these two members on the inner side of the welded portion between the resin outer wall portion of the intermediate intake pipe portion and the resin main body portion of the intake manifold, the outer wall portion, etc. It is possible to assemble the main body and the divided structure at the same time without separately providing a means for fixing the heat-resistant inner layer.
According to the third aspect of the invention, the EGR gas introduced from the EGR gas introduction pipe is caused to collide with the inside of the portion of the intermediate intake pipe portion where the EGR gas introduction pipe is connected, and the EGR gas is introduced. The collision wall member for dispersing in a direction substantially perpendicular to the direction is provided so as to be located at a substantially middle position of the inner passage of the intermediate intake pipe portion, so that the inner side of the main body portion facing the outer wall portion It is possible to suppress the high-temperature EGR gas from colliding with the wall portion, and to suppress the thermal deterioration of the main body portion. In addition, since the collision wall member disperses the EGR gas in a direction substantially orthogonal to the introduction direction and is located at an intermediate position of the internal passage of the intermediate intake pipe portion, in other words, in the internal passage Since the EGR gas is dispersed at least on the outer wall portion side with respect to the intermediate position, it is possible to further improve the mixing property between the main flow of the intake air flow rising along the outer wall portion and the EGR gas.

1 is a front view of an engine equipped with an intake device according to an embodiment of the present invention. 1 is a schematic overall view schematically showing an engine and an intake system. It is a front view of an intake device. It is a side view of the intake device seen from the engine longitudinal direction other side. It is a side view of the intake device seen from one side in the engine longitudinal direction. It is a top view of an intake device. It is a bottom view of an intake device. It is a rear view of an intake device. FIG. 4 is a cross-sectional view taken along line IX-IX in FIG. 3. FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. FIG. 6 is a cross-sectional view taken along line XI-XI in FIG. 5. It is the figure which looked at the spacer member from the flow direction of the intake flow. It is a perspective view which shows an intake manifold and an intercooler. FIG. 4A is an enlarged view of a portion A in FIG. 10, and FIG. 4B is a perspective view of the nozzle member. It is a figure which shows the heat resistant inner layer arrange | positioned by the inner surface side of an outer wall part. The figure (a) is an arrow sectional view of the XVIA-XVIA line of FIG. 15, The figure (b) is an enlarged view of the XVIB part in the figure (a). It is a figure which illustrates typically the communication mode of the gathering part and internal passage in a downstream branch pipe part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

-Overall configuration-
FIG. 1 is a front view of an engine equipped with an engine intake device according to the present embodiment. The engine 1 is a diesel engine, and includes a cylinder block 1c provided with four cylinders 11a, 11b, 11c, and 11d (see FIG. 2) arranged in a row, and an oil provided below the cylinder block 1c. The structure includes a pan 1d, a cylinder head 1b assembled to the upper surface of the cylinder block 1c, and a head cover 1a assembled to the peripheral edge of the upper surface of the cylinder head 1b. The engine 1 is mounted on a front engine / front drive type vehicle, and is arranged in the engine room so that the four cylinders 11a, 11b, 11c, and 11d are arranged in the vehicle width direction. This is a so-called in-line 4-cylinder horizontal engine.

  Thus, in the present embodiment, the engine longitudinal direction, which is the arrangement direction of the four cylinders 11a, 11b, 11c, and 11d, substantially coincides with the vehicle width direction, and the engine width direction substantially coincides with the vehicle longitudinal direction. Hereinafter, unless otherwise specified, the front side is one side in the engine width direction (front side in the vehicle front-rear direction), the rear side is the other side in the engine width direction (rear side in the vehicle front-rear direction), and the left side is one side in the engine front-rear direction ( The left side in the vehicle width direction) and the right side refer to the other side in the longitudinal direction of the engine (right side in the vehicle width direction).

  The engine 1 is a so-called front intake rear exhaust engine having an intake system (intake device 3) connected to the front side and an exhaust system connected to the rear side. Then, on the outer surface of the intake side (one side in the engine width direction) of the engine 1 of the present embodiment, in addition to the intake system, an alternator 41 that generates an alternating current used in the electrical system, a water pump 51, an air conditioner An auxiliary machine such as a starter motor 71 for driving the engine 1 until the complete explosion at the start is provided.

  The intake device 3 of the present embodiment includes an intake manifold 5 disposed on the left side of the alternator 41 on the intake side outer surface of the engine 1, an intercooler 7 combined with the intake manifold 5, and the intake manifold 5. An intake control valve unit 9 provided on the upstream side, and a spacer member 13 interposed between the intake control valve unit 9 and the intake manifold 5 to connect the intake control valve unit 9 and the intake control valve An intake duct 63 is connected to the upstream side of the unit 9.

  Thus, as shown in FIG. 2, the entire intake system includes an air cleaner 81 connected to an air duct (not shown) and a compressor chamber (not shown) of a supercharger (turbocharger) 91. The turbocharger 91 and the throttle body 19 of the intake control valve unit 9 are connected by an intake duct 63, and the intake manifold 5 in which the throttle body 19 of the intake control valve unit 9 and the intercooler 7 are combined is a spacer. Connected via a member 13, a downstream branch pipe portion 15 of the intake manifold 5 described later and an intake port 21 formed in each cylinder 11 a, 11 b, 11 c, 11 d of the engine 1 are connected, and each cylinder 11 a of the engine 1 is connected. 11b, 11c, 11d are connected to the turbine chamber (not shown) of the turbocharger 91. In addition, the intake duct 53 and the exhaust duct 73 are connected by a recirculation passage 83 provided with an EGR cooler 83a, and the intake manifold 5 and the exhaust port 31 are connected to an EGR gas introduction pipe provided with an EGR valve 93a. 93.

  Thereby, in the intake system of the present embodiment, the fresh air purified by the air cleaner 81 and the EGR gas recirculated from the exhaust duct 73 and cooled by the EGR cooler 83a are mixed in the intake duct 53, and the mixed gas (Intake air) is supplied to the compressor chamber of the supercharger 91 and compressed. The compressed high-temperature intake air reaches the intake control valve unit 9 through the intake duct 63, sequentially passes through the throttle body 19 and the spacer member 13, and is supplied to the intake manifold 5. The intake air cooled by the intercooler 7 in the intake manifold 5 is discharged from the exhaust port 31 and further mixed with part of the exhaust gas introduced into the intake manifold 5 by the EGR gas introduction pipe 93, and then each intake air. Distribution is supplied to the port 21. Thus, the combusted intake air becomes exhaust gas, a part of which is introduced into the intake manifold 5 through the EGR gas introduction pipe 93, while the remaining part is supplied to the turbine chamber of the supercharger 91 and is not shown. After rotating the turbine, it is discharged through the exhaust duct 73.

-Intake device-
Next, each part which comprises the intake device 3 is demonstrated. FIG. 3 is a front view of the intake device, FIG. 4 is a side view of the intake device viewed from the right side, FIG. 5 is a side view of the intake device viewed from the left side, and FIG. 7 is a bottom view of the intake device, FIG. 8 is a rear view of the intake device, and FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 10 is a cross-sectional view taken along line XX in FIG. 3, and FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 5. As described above, the intake device includes the intake control valve unit 9, the spacer member 13, the intake manifold 5, and the intercooler 7.

  As shown in FIG. 5, the intake control valve unit 9 is motor-driven, and is opposed to a metal throttle body 19 having a through-hole 19a having a circular cross section constituting the intake passage in the radial direction of the intake passage. The valve shaft 29 is rotatably supported by the throttle body 19 by the valve shaft support portions 19b and 19c formed on the throttle body 19, and is fixed to the valve shaft 29. A circular valve body 39 that opens and closes the intake passage by rotating with the rotation of the valve shaft 29, a drive motor (not shown) capable of forward / reverse drive, and the driving force of the drive motor And a drive transmission portion 49 in which a transmission mechanism portion (not shown) for transmitting to the valve shaft 29 is housed in a metal housing. Reference numeral 59 in the figure denotes control valve heating for flowing warm water in the engine coolant circulation system incorporated in the intake control valve unit 9 to prevent icing of the valve shaft support portion 19c during cold. It is a waterway. The control valve heating water channel 59 extends rearward along the bottom surface of the throttle body 19 as shown in FIG. 7, and passes through the vicinity of the valve shaft support portion 19c on the engine 1 side as shown in FIG. So as to extend upward.

  Thus, the intake control valve unit 9 is driven by a drive current controlled by a computer based on signals from an unillustrated accelerator sensor, rotation speed sensor, etc., and the driving force is transmitted by a transmission mechanism. The amount of intake air sent to the intake port 21 of the engine 1 is controlled by opening and closing the intake passage which is transmitted to the valve shaft 29 and rotated by the valve body 39 fixed to the valve shaft 29.

  The spacer member 13 is made of metal, and as shown in FIG. 12, an intake communication passage portion 13a having a circular cross section for allowing intake air to pass therethrough is formed at the center thereof. As described above, the spacer member 13 is interposed between the intake control valve unit 9 and the intake manifold 5 and connects the downstream end portion of the throttle body 19 and the upstream intake pipe portion 35 of the intake manifold 5. As a result, the throttle body 19 and the upstream intake pipe portion 35 communicate with each other.

  By the way, in the intake system of the engine, the intercooler is often located upstream of the throttle body. However, in the present embodiment, the intercooler 7 is combined with the intake manifold 5, and therefore the intercooler 7 is It is located downstream of the throttle body 19. For this reason, high-temperature intake air compressed in the compressor chamber of the supercharger 91 passes through the throttle body 19 without being cooled by the intercooler 7. As described above, when the high-temperature intake air that has not been cooled passes through the throttle body 19 of the intake control valve unit 9, the drive motor and the transmission mechanism of the drive transmission unit 49 may be overheated.

  In view of this, the spacer member 13 has a water channel for circulating the cooling water inside the spacer member 13 in order to suppress overheating of the drive transmission unit 49, specifically, a joint with the intake control valve unit 9. An internal water passage 13b for allowing cooling water to flow is formed on the drive transmission portion 49 side of the intake communication passage portion 13a. More specifically, as shown in FIG. 5, the internal water channel 13b extends substantially straight downward, then bends at the center in the height direction of the spacer member 13, and inclines toward the engine 1 toward the bottom. As shown in FIG. 12, not only the drive transmission portion 49 but also the valve shaft support portion 19b on the drive transmission portion 49 side in the intake control valve unit 9 as viewed in the flow direction of the intake flow, as shown in FIG. overlapping.

  Thus, by forming the internal water channel 13b in the spacer member 13, the cooling water introduced from the cooling water introduction pipe 23 connected to the upper end of the internal water channel 13b flows downward while cooling the drive transmission unit 49, Since it is discharged from the cooling water discharge pipe 33 connected to the lower end of the internal water passage 13b, the intake control valve unit 9 is specialized (the internal water passage is provided in the intake control valve unit 9 or a heat-resistant drive motor is used. Without), it is possible to suppress the overheating of the drive transmission unit 49 as much as possible.

  As the cooling water that flows in the internal water passage 13b, cooling water that flows through an intercooler cooling water circulation system (not shown) may be used, and in this case, by cooling water having a low water temperature that flows through the intercooler cooling water circulation system, Cooling of the intake control valve unit 9 can be promoted, and the icing of the valve shaft support portion 19c on the engine 1 side can be effectively prevented by the warm cooling water of the engine cooling water circulation system flowing through the control valve heating water passage 59. Can do. Further, when the intake control valve unit 9 does not include the control valve heating water channel 59, the cooling water flowing through the engine cooling water circulation system (not shown) may be used as the cooling water that flows through the internal water channel 13b. In addition, the intake control valve unit 9 can be cooled by the coolant flowing through the engine coolant circulation system, and as described above, the internal water passage 13b is the valve shaft on the drive transmission unit 49 side as viewed in the flow direction of the intake flow. Since it overlaps with the support part 19b, the icing of the valve shaft support part 19b can be prevented by the warm cooling water of the engine coolant circulation system.

  The intake manifold 5 is made of 35% glass fiber reinforced polyamide 66 resin (PA66-GF35), and, as shown in FIGS. 3 to 11, a downstream branch pipe portion 15 communicating with each cylinder 11 a, 11 b, 11 c, 11 d The chamber portion 25 positioned below the downstream branch pipe portion 15, the upstream intake pipe portion 35 communicating with the chamber portion 25, and the intermediate intake pipe portion communicating the chamber portion 25 and the downstream branch pipe portion 15 45, and is fastened and fixed to the outer surface on the intake side of the engine 1 by nine bolts, as will be described later. When viewed from the intake flow, the chamber portion 25 is disposed downstream of the upstream intake pipe portion 35, the intermediate intake pipe portion 45 is disposed downstream of the chamber portion 25, and the downstream side of the intermediate intake pipe portion 45. The downstream branch pipe portion 15 is disposed at the bottom. Hereinafter, the intake manifold 5 and the intercooler 7 incorporated therein will be described in order from the upstream side.

  The upstream intake pipe portion 35 extends to the left from the chamber portion 25 and is connected to the throttle body 19 through the spacer member 13 at the left end portion. In other words, as shown in FIG. 9, the upstream intake pipe portion 35 is curved from the downstream end portion of the spacer member 13 toward the outer surface on the intake side of the engine 1 and extends to the right side. 25 communicates with the chamber portion 25 on the rear side (the outer surface side of the engine 1).

  As shown in FIGS. 9 to 11, the chamber portion 25 has a substantially rectangular bottom wall portion 25a whose longitudinal direction is the longitudinal direction of the engine, and is opposed to the bottom wall portion 25a above the bottom wall portion 25a. A substantially rectangular top wall portion 25b provided, and a first side wall portion 25c extending upward from the right side edge portion of the bottom wall portion 25a and having an upper end connected to the right side edge portion of the top wall portion 25b; A second side wall 25d extending upward from the left side edge of the bottom wall 25a and having an upper end connected to the left side edge of the top wall 25b; and a front side from the front side edge of the bottom wall 25a A front side wall 25e that curves upward and extends upward, a rear side wall 25f that curves upward from the rear side edge of the bottom wall 25a and extends upward, and an upper end of the front side wall 25e The front extension wall portion 2 that extends further upward from the upper end portion and is connected to the front side edge portion of the top wall portion 25b. And g, the upper end extends further upward from the upper end of the rear vertical wall portion 25f has an a side extension wall portion 25h after which is connected to the side-to-side rear edge of the top wall portion 25b.

  As shown in FIG. 9, the front side wall 25e has a right side edge that is the front side edge of the first side wall 25c, and a left side edge that is the front side edge of the second side wall 25d. And are curved to the front side when viewed from above and below. Thus, the front side wall portion 25e has a shape that curves to the front side when viewed from the front-rear direction of the engine or the vertical direction, in other words, the bottom wall portion 25a, the first side wall portion 25c, and the second side wall. The front side edge of the portion 25d and the surface connected to the lower end of the front extension wall 25g are formed in a shape that bulges to the front. A communication hole connected to the intermediate intake pipe 45 is formed at the upper end of the front side wall 25e.

  On the other hand, as shown in FIG. 9, the rear side wall portion 25 f has a right side edge portion which is a rear side edge portion of the first side wall portion 25 c, and a left side edge portion which is an upstream intake pipe portion 35. They are connected to each other and are curved to the rear side when viewed from above and below. Thus, the front side wall 25e has a shape that curves to the front side when viewed from the front-rear direction of the engine or the vertical direction, in other words, the rear side of the bottom wall 25a and the first side wall 25c. The edge and the surface connected to the lower end of the rear extension wall 25h are formed in a shape that bulges to the rear.

  Thus, by constituting the chamber part 25, as shown in FIGS. 9-11, the bottom wall part 25a, the top wall part 25b, the 1st side wall part 25c, and the 2nd inside the chamber part 25 are comprised. A space part surrounded by the side wall part 25d, the front side wall part 25e, the rear side wall part 25f, the front side extension wall part 25g and the rear side extension wall part 25h is formed. Thus, in the chamber portion 25, by providing a front extension wall portion 25g and a rear extension wall portion 25h, the vertical dimension at the central portion of the chamber portion 25 is changed to the dimension in the engine longitudinal direction and the width direction. Since the inner cross section seen from the engine width direction (see FIG. 11) is the same as the inner empty cross section seen from the vertical direction (see FIG. 9) or the inner empty cross section seen from the engine longitudinal direction (see FIG. 11). (See FIG. 10).

  Further, as shown in FIG. 8, the chamber portion 25 includes a mounting bracket 25 i having a bolt insertion hole formed at the lower end portion of the rear side wall portion 25 f, and 2 formed on the upper side of the top wall portion 25 b. And a mounting portion 25j having two bolt insertion holes. As a result, the chamber portion 25 has an intake side of the engine 1 by a single bolt 25q through a mounting bracket 25i at its lower end and two bolts 25r inserted through the mounting portion 25j at its upper end. It is fastened and fixed to the outer surface. In addition, the code | symbol 25k in a figure is a rib formed in order to improve the rigidity of the chamber part 25, and the code | symbol 25l is a rib in order to connect the chamber part 25 and the downstream branch pipe part 15 firmly.

  As shown in FIG. 13, a vertically long rectangular opening 25m is formed in the first side wall 25c of the chamber 25 (on the side opposite to the upstream intake pipe 35). The portion is inserted into the chamber portion 25 through the rectangular opening 25 m and is accommodated in the space portion formed in the chamber portion 25.

  The intercooler 7 is a water-cooled intercooler. As shown in FIGS. 4 and 13, the intercooler main body 17, a cooling water introduction pipe 37 for supplying cooling water to the intercooler 7, and the intercooler A cooling water discharge pipe 47 for discharging the heated cooling water from the cooler 7, and an intercooler mounting connected to the right side surface of the intercooler main body 17 and supporting the cooling water introduction pipe 37 and the cooling water discharge pipe 47. Part 27. In addition, the code | symbol 57 in a figure is an air vent pipe for extracting the air contained in cooling water.

  The intercooler main body portion 17 is formed in a rectangular parallelepiped shape, and the front and rear side surfaces (a pair of surfaces facing the engine width direction) are the widest surfaces. The intercooler body 17 has a rectangular parallelepiped core 17a and a tank 17b provided on the upper side of the core 17a. It should be noted that not only the intercooler main body 17 but also the core portion 17a has the widest intake passage surface on the front and rear sides, in other words.

  As shown in FIG. 13, in the core portion 17a, a plurality of water tubes 17e each having a thin cylindrical plate shape are arranged in the longitudinal direction of the engine. Although not shown, corrugated corrugated fins are joined to the outer wall surface of each water tube 17e by brazing or the like, thereby increasing the surface area of each water tube 17e and improving the heat dissipation effect. It has become. The tank portion 17b is divided into an inlet tank 17c and an outlet tank 17d, and the inlet tank 17c and the outlet tank 17d communicate with the water tube 17e, respectively. Thus, by constituting the intercooler body 17, the cooling water introduced from the cooling water introduction pipe 37 is stored in the inlet tank 17 c, and then supplied to each water tube 17 e to supply high-temperature intake air. While cooling, the cooling water heated by heat exchange with the high-temperature intake air is stored in the outlet tank 17d and then discharged from the cooling water discharge pipe 47. The cooling water introduction pipe 37 and the cooling water discharge pipe 47 communicate with the intercooler cooling water circulation system.

  The intercooler main body portion 17 is inserted into the chamber portion 25 through the rectangular opening 25m and is built in the chamber portion 25 so as to divide the chamber portion 25 in the front-rear direction (in the engine width direction). More specifically, as shown in FIGS. 9 to 11, the intercooler main body portion 17 inserted from the rectangular opening 25m has an upper surface and a lower surface of the top wall portion 25b, and a lower surface and an upper surface of the bottom wall portion 25a. And the left side surface thereof and the inner side surface of the second side wall portion 25d are flush with each other, and the tank portion 17b is sandwiched between the front side extension wall portion 25g and the rear side extension wall portion 25h. The space formed in the chamber portion 25 is accommodated in the chamber portion 25 so as to partition the space forward and backward. As a result, a front space 25n is formed between the front side wall 25e formed so as to swell to the front side and the front surface of the core part 17a of the intercooler main body part 17, and so as to swell toward the rear side. Between the formed rear side wall portion 25f and the rear surface of the core portion 17a of the intercooler body portion 17, a rear space portion 25o having substantially the same volume as the front space portion 25n is formed.

  Then, as shown in FIG. 4, the intercooler 7 has a rectangular opening in the chamber portion 25 in the state where the intercooler main body portion 17 is accommodated in the chamber portion 25 as described above. It is combined with the intake manifold 5 by being fastened and fixed to the peripheral portion 25p of the portion 25m by eight bolts 25s. In addition, the outer surface of the intercooler main body part 17 accommodated in the chamber part 25, the lower surface of the top wall part 25b, the inner surface of the second side wall part 25d, the upper surface of the bottom wall part 25a, and the inner periphery of the rectangular opening 25m The surface is sealed by a sealing member such as packing so that air does not leak between the front space portion 25n and the rear space portion 25o. The intercooler 7 is not fixed to the portion 25, and is fixed to the chamber portion 25 only at the peripheral edge 25p of the rectangular opening 25m.

  As described above, since the intercooler 7 is accommodated in the chamber portion 25 of the intake manifold 5, it is not necessary to separately arrange the intercooler 7 in the engine room. Compared to the case where the cooler 7 is not built in the intake manifold 5, the space in the engine room can be saved.

  Further, as shown in FIG. 1, since the alternator 41 is provided adjacent to the right side of the chamber portion 25 as shown in FIG. 25, as described above, the vertical dimension at the center of the chamber 25 is larger than the dimensions in the longitudinal direction of the engine and in the width direction. Since a large area is ensured in the direction, it is possible to ensure a large internal cross section as viewed from the engine width direction while saving space in the engine room. Thus, the rectangular parallelepiped intercooler main body 17 in which the intake passage surface facing the engine width direction is the widest surface in the chamber portion 25 having a large inner air cross section when viewed from the engine width direction as described above. In the intake device 3 of this embodiment, the area of the intake passage surface can be effectively secured while suppressing the lengthening of the intercooler.

  On the other hand, as described above, the intake control valve unit 9 including the metal throttle body 19 is attached to the intake manifold 5 (upstream intake pipe portion 35) via the spacer member 13, so that these intake control valve units 9 9 and the center of gravity of the entire intake manifold 5 including the spacer member 13 is shifted to the left side. Thus, when the engine 1 vibrates with the center of gravity close to the left side, the intake manifold 5 and the intake control valve unit 9 also vibrate accordingly, but the intake manifold 5 is required due to the unbalance of the center of gravity. Because of the above shaking, the stress generated in the resin intake manifold 5 is increased by the amount of shaking caused by such imbalance, and the reinforcement such as the increase of wall thickness and the addition of ribs is performed by the amount of the increased stress. Is required.

  Here, in the chamber portion 25 of the present embodiment, the cooling water introduction pipe 37 and the cooling water discharge pipe 47 are cooled inside the peripheral edge portion 25p of the rectangular opening portion 25m formed in the first side wall portion 25c located on the right side. Since the intercooler mounting portion 27 that supports a heavy object containing water is fastened and fixed, the intake control valve unit 9 and the intercooler 7 can be connected to the intake manifold 5 only when the intake control valve unit 9 is connected. The center of gravity of the entire intake manifold 5 can be brought closer to the center of gravity of the intake manifold 5 itself. Thereby, the vibration resulting from imbalance is suppressed, and reinforcement can be made unnecessary for the suppressed vibration.

  Next, the intermediate intake pipe portion 45 will be described. The intermediate intake pipe portion 45 connects the front space portion 25n of the chamber portion 25 and the downstream branch pipe portion 15 unlike the conventional one in which a surge tank and a plurality of cylinders are connected by a plurality of intake branch pipes. It constitutes a single passage. As shown in FIGS. 3 to 5 and 10, the intermediate intake pipe portion 45 is curved from the upper end portion of the front side wall portion 25 e of the chamber portion 25 to the front side (outside in the engine width direction) and extends upward. These are connected to a branch pipe main body 15a of a downstream branch pipe 15 which will be described later. Thereby, the intermediate intake pipe portion 45 is formed with an internal passage 45a having a circular cross section that is curved forward and extends in the up-down direction, and the front space portion 25n of the chamber portion 25 is connected to the intermediate intake pipe portion 45 through the internal passage 45a. A collecting portion 15c of the downstream branch pipe portion 15 described later is in communication. In this way, by forming the internal passage 45a that curves to the front side and extends in the vertical direction, the intake air that has passed through the intercooler body 17 is formed on the inner surface of the front side wall 25e as shown in FIG. After the collision, the internal passage 45a is lifted so as to mainly follow the outer circumferential side surface of the internal passage 45a.

  Further, as shown in FIGS. 4 and 5, the intermediate intake pipe part 45 is an inner side formed integrally with the chamber part 25 and the downstream branch pipe part 15 constituting the rear half of the intermediate intake pipe part 45. It has a divided structure having a wall portion 55 and an outer wall portion 65 formed separately from the chamber portion 25 and the downstream branch pipe portion 15 constituting the front half of the intermediate intake pipe portion 45, By welding the flange portion 55a formed so as to protrude outward from the outer peripheral edge portion of the wall portion 55 and the flange portion 65a formed so as to protrude outward from the outer peripheral edge portion of the outer wall portion 65, An outer wall 65 is attached to the inner wall 55.

  In addition, the intake manifold 5 is made of a resin-made rear main body A including a rear side wall 25f of the chamber portion 25 and a flange portion 15b of the downstream branch pipe portion 15 described later (behind the thick broken line in FIG. 5). Side), the downstream main body portion B including the downstream branch pipe portion 15 and other portions of the chamber portion 25 and the inner wall portion 55 (front side from the thick broken line in FIG. 5), and at least the outer wall portion 65. In this embodiment, the divided structure C and the outer wall portion 65 coincide with each other. As described above, by dividing the intake manifold 5, the intake manifold 5 can be molded and die-cut relatively easily even if it has a complicated structure with many openings and bulges. ing.

  The EGR gas introduction pipe 93 is connected to the outer wall portion 65. More specifically, the outer wall portion 65 is provided with a flange portion 65c for fastening the EGR gas introduction pipe 93 with a bolt at a substantially central portion thereof, and the nozzle member 43 is attached to the flange portion 65c. For this purpose, a mounting hole 65d penetrating to the internal passage 45a is formed. In addition, the code | symbol 65b in a figure is a rib formed in order to improve the rigidity of the outer side wall part 65. FIG.

  This nozzle member 43 is a sheet metal press-molded product, and as shown in FIGS. 14A and 14B, an annular flange portion 43a and an inner peripheral edge portion of the flange portion 43a are perpendicular to the flange portion 43a. A cylindrical mounting portion 43b that extends and has a stepped portion, a cylindrical nozzle tip portion 43c that further extends from the tip of the mounting portion 43b, and a blocking portion 43d (collision wall) that closes the tip of the nozzle tip portion 43c. Member), and is formed in a bottomed cylindrical shape as a whole. In addition, a pair of opening portions 43e are formed in the nozzle tip portion 43c so as to face each other in the diameter direction. On the other hand, a stepped portion is formed on the wall surface defining the mounting hole 65 d so as to correspond to the outer shape of the nozzle member 43. Thus, the nozzle member 43 has a pair of openings 43e in the vertical direction with the sealing O-ring 43f sandwiched between the flange portion of the nozzle member 43 and the stepped surface of the mounting hole. It is inserted into the mounting hole 65d in such a posture as to face each other.

  In this way, by attaching the nozzle member 43 to the outer wall portion 65, the blocking portion 43d is located approximately in the middle of the internal passage 45a inside the portion of the intermediate intake pipe portion 45 where the EGR gas introduction pipe 93 is connected. In other words, it is located at the center of the circular cross section of the internal passage 45a. Then, when the EGR gas is introduced from the EGR gas introduction pipe 93, the EGR gas that has passed through the inside of the nozzle member 43 collides with the closing portion 43d provided to close the nozzle tip portion 43c, As shown in FIG. 14 (a), the gas is discharged from the pair of openings 43e so as to be divided into upper and lower portions, and is moved up and down in the vicinity of the outer wall portion 65 (exactly in the vicinity of the outer peripheral circular surface of the inner passage 45a). Will be distributed.

  That is, the blocking portion 43d plays a role of causing the EGR gas introduced from the EGR gas introduction pipe 93 to collide and disperse the EGR gas in a direction substantially orthogonal to the introduction direction. By providing at substantially the intermediate position, EGR gas can be dispersed on the outer peripheral circle side in the internal passage 45a outside the central portion in the circular cross section.

  Then, as described above, the intake air that has passed through the intercooler main body portion 17 rises up the internal passage 45a mainly along the outer circumferential side surface of the internal passage 45a. Therefore, the intake air and the EGR gas Therefore, the mixing property of EGR gas can be improved. The pair of openings 43e may be opposed in any direction. For example, when the pair of openings 43e are opposed in the left-right direction, the EGR gas flows in the circumferential direction of the internal passage 45a. In order to disperse (also on the inner circumference side) and the mixing property of the EGR gas may be reduced, a pair of openings is required to disperse the EGR gas in the longitudinal direction of the internal passage 45a and in the vicinity of the outer wall portion 65. 43e is preferably opposed in the vertical direction.

  By the way, since the EGR gas introduced from the EGR gas introduction pipe 93 is a high temperature and the intake manifold 5 is made of resin, the wall surface of the internal passage 45a of the intermediate intake pipe portion 45 into which the high temperature EGR gas is introduced. However, the EGR gas is introduced in the vicinity of the outer wall portion 65 and mainly mixed with the intake air in the vicinity of the outer wall portion 65, although it is intermediate. Applying heat resistance treatment to all the wall surfaces in the internal passage 45a of the intake pipe portion 45 causes an unnecessary cost increase.

  Therefore, in the present embodiment, as shown in FIG. 15, the heat resistance that forms the wall surface of the internal passage 45 a only on the inner surface side of the outer wall portion 65 where the EGR gas is dispersed in the vicinity of the intermediate intake pipe portion 45. A conductive inner layer 75 is provided. The heat resistant inner layer 75 is made of a resin molded body made of 35% glass fiber reinforced polyphthalamide resin (PPA-GF35) having a wall surface shape that matches the shape of the wall surface in the internal passage 45a. Thus, by forming the heat-resistant inner layer 75 with the resin molded body having the wall surface shape that matches the shape of the wall surface in the internal passage 45a, it becomes possible to perform the heat-resistant treatment at a low cost, and the heat-resistant inner layer. By providing the layer 75, it is possible to suppress the inhibition of the intake air flow.

  As shown in FIG. 16, a flange portion 75a protruding outward is formed on the outer peripheral edge portion of the resin molded body constituting the heat-resistant inner layer 75 over the entire circumference thereof. An engaging protrusion 75b that protrudes toward the outer wall 65 is provided at the tip, and a welding protrusion 75c that protrudes toward the inner wall 55 is provided at the center of the flange 75a. It is formed over the entire circumference of the portion 75a.

  The flange 55a of the inner wall 55 is provided with an inner protrusion 55b protruding from the base end toward the outer wall 65, and a welding protrusion protruding from the center toward the outer wall 65. A strip 55c and an outer projection 55d projecting from the tip of the strip 55c toward the outer wall 65 are formed over the entire circumference of the flange 55a. On the other hand, the flange 65a of the outer wall 65 has a central protrusion 65e protruding from the center toward the inner wall 55 over the entire circumference of the flange 65a. A welding groove portion 65f is formed at the tip of the central ridge portion 65e, and an engagement groove portion 65g is formed inside the central ridge portion 65e over the entire circumference of the central ridge portion 65e. .

  Then, after the resin protrusions constituting the heat-resistant inner layer 75 are stacked on the inner side of the outer wall part 65 so that the engagement protrusion part 75b is fitted in the engagement groove part 65g, the outer protrusion part 55d. In the state where the tip of is applied to the flange portion 65a of the outer wall portion 65, the welding protrusion 55c is fitted into the welding concave groove 65f, and the tip of the welding protrusion 75c is applied to the tip of the inner protrusion 55b, By vibration welding the welding protrusion 55c and the welding concave groove 65f, the flange 55a of the inner wall 55 and the flange 65a of the outer wall 65 are firmly joined. In the present embodiment, the flange portion 55a of the inner wall portion 55 and the flange portion 65a of the outer wall portion 65 joined by vibration welding constitute a weld portion as referred to in the present invention.

  At this time, the engagement protrusion 75b of the resin molded body fits into the engagement concave groove portion 65g, and the flange portion 75a of the resin molded body includes the flange portion 55a of the inner wall portion 55 and the flange portion 65a of the outer wall portion 65. Therefore, the resin molded body is firmly fixed to the outer wall portion 65. Further, when the welding projection 55c and the welding concave groove portion 65f are vibration welded, the welding projection 75c of the resin molded body is also vibration welded to the inner projection 55b, so the inner wall portion of the resin molded body The backlash with respect to 55 and the outer side wall part 65 is also suppressed.

  As shown in FIG. 1, the downstream branch pipe section 15 extends above the alternator 41 and extends in the longitudinal direction of the engine so as to cover the eight intake ports 21 of the four cylinders 11a, 11b, 11c, and 11d. A branch pipe body 15a in which an internal passage for distributing air to the cylinders 11a, 11b, 11c, and 11d is formed; and a flange 15b for attaching the downstream branch pipe 15 to the cylinder head 1b. doing. In addition, the code | symbol 15e in a figure is a rib formed in order to improve the rigidity of the branch pipe main-body part 15a.

  As shown in FIGS. 4 and 5, the branch pipe main body portion 15 a is formed so as to swell toward the front side and has a substantially semi-circular circular cross-sectional outer shape when viewed from the front-rear direction. The branch pipe main body 15a secures a collecting portion 15c (see FIG. 10) wider than a cross section of an internal passage 15d described later in order to enhance the stirring of the intake air introduced from the intermediate intake pipe 45 and the EGR gas. Therefore, as shown in FIG. 6, the cross-sectional height in the width direction and the up-down direction becomes higher from the both ends in the front-rear direction toward the center.

  On the other hand, the internal passage 15d (see FIG. 10) formed in the branch pipe main body 15a is formed so that the cross section gradually increases from both ends in the longitudinal direction of the engine to the collecting portion 15c. As shown in FIG. 17, the gathering portion 15c is communicated gently. As a result, the intake air and the EGR gas, as indicated by the white arrows in FIGS. 10 and 17, once hit the flange portion 15b of the collecting portion 15c and are swirled and stirred in the collecting portion 15c, and then the internal passage 15d. Since the EGR gas is supplied not only to the second and third cylinders 11b and 11c but also to the first and fourth cylinders 11a and 11d, it is possible to improve the distribution of the EGR gas.

  The flange portion 15b is provided on the rear side of the branch pipe main body portion 15a, and is formed in a substantially oval shape when viewed from the width direction as shown in FIG. As shown in FIG. 8, the flange portion 15b is formed with eight intake openings 15f at positions corresponding to the eight intake ports 21, and these eight intake openings 15f are connected to the collective portion 15c or Each communicates with the internal passage 15d. In addition, the code | symbol 15g in FIG. 8 is an O-ring as a sealing means arrange | positioned between a flange part and the cylinder head 1b, and the code | symbol 15h is for aiming at weight reduction of the downstream branch pipe part 15. FIG. It is a formed hollow recess.

  In addition, as shown in FIG. 3, the flange portion 15b has six attachment portions 15i each having bolt insertion holes formed therein, four at the upper portion of the flange portion 15b and two at the lower portion. The two mounting portions 25j described above are formed, and the downstream branch pipe portion 15 is fastened to the outer surface on the intake side of the engine 1 by eight bolts 15j and 25r inserted through the eight mounting portions 15i and 25j. It is fixed.

  In the intake device 3 of the present embodiment configured as described above, the high-temperature intake air compressed in the compressor chamber of the supercharger 91 passes through the throttle body 19 and the spacer member 13, and as shown in FIG. Then, the air is introduced into the rear space portion 25 o of the chamber portion 25 through the upstream intake pipe portion 35. As shown in FIGS. 9 and 10, the high-temperature intake air introduced into the rear space 25o passes through the water tube 17e when passing through the core 17a of the water-cooled intercooler 7 from the rear to the front. It is cooled by heat exchange with the flowing cooling water, and is introduced into the front space 25n in a state where the filling efficiency is increased.

  Then, as shown in FIG. 10, the intake air that has passed through the core portion 17a of the intercooler 7 collides with the inner side surface of the front side wall portion 25e, and then mainly the outer peripheral surface (outer wall side) of the internal passage 45a. The inner passage 45a is raised along the inner side surface of the portion 65 and introduced into the collecting portion 15c of the downstream branch pipe portion 15 while being mixed with the EGR gas dispersed vertically in the vicinity of the outer wall portion 65. Is done. The mixed gas introduced into the collecting portion 15c hits the flange portion 15b of the collecting portion 15c, is swirled in the collecting portion 15c and further stirred, and then supplied to the internal passage 15d to be supplied to each cylinder 11a, 11b, 11c, 11d. Distributed to.

-Effect-
According to the present embodiment, since the intermediate intake pipe portion 45 is curved to the front side, the intake flow rises mainly along the outer wall portion 65 of the intermediate intake pipe portion 45. Then, since the EGR gas introduction pipe 93 is connected to the outer wall part 65 of the intermediate intake pipe part 45, the EGR gas introduced in the vicinity of the outer wall part 65 rises along the outer wall part 65. This makes it easy to mix with the intake air flow that has been made, so that the mixing properties of the EGR gas can be improved.

  In addition, as the intake manifold 5, a resin body part A, B and an outer wall part 65 are welded, and heat resistance is applied to the inner surface side of the outer wall part 65 that needs to be subjected to heat resistance treatment. By forming the inner layer 75, it is possible to improve the heat resistance of the intake manifold 5 while suppressing unnecessary cost increase, and by adopting such a divided structure, a part of the internal passage 45a is configured. The heat-resistant inner layer 93 can be easily formed on the inner surface side of the outer wall portion 65 to be performed.

  In addition, since the EGR gas introduction pipe 93 is connected to the outer wall part 65 of the intermediate intake pipe part 45 that communicates the chamber part 25 and the downstream branch pipe part 15, the EGR gas is located downstream of the intercooler 7. Therefore, the deterioration of the performance of the intercooler 7 due to the soot contained in the EGR gas can be suppressed.

  Furthermore, since an inexpensive resin molded body is used as the heat resistant inner layer 75, the manufacturing cost of the intake manifold 5 can be further reduced.

  Further, the resin molded body constituting the heat-resistant inner layer 75 is sandwiched between these two members on the inner side of the welded portion between the outer wall portion 65 and the inner wall portion 55 of the intermediate intake pipe portion 45. It is possible to assemble the outer wall portion 65 and the inner wall portion 55 at the same time as welding without separately providing a means for fixing the heat resistant inner layer 75 to the wall portion 65 or the like.

  Further, a blocking portion 43d for colliding the EGR gas introduced from the EGR gas introduction pipe 93 is provided inside the portion of the intermediate intake pipe portion 45 where the EGR gas introduction pipe 93 is connected. Therefore, it is possible to suppress the high temperature EGR gas from colliding with the inner wall portion 55 facing the outer wall portion 65, and to suppress the thermal deterioration of the intake manifold 5.

  Further, the closing portion 43d is provided so as to disperse the EGR gas in a direction substantially orthogonal to the introduction direction and to be positioned at an intermediate position of the internal passage 45a of the intermediate intake pipe portion 45. Since the EGR gas is dispersed on the outer wall 65 side from at least the intermediate position in the passage 45a, the mixing property between the main flow of the intake air flow rising along the outer wall 65 and the EGR gas is further improved. Can do.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In the above embodiment, the spacer member 13 is disposed on the downstream side of the throttle body 19. However, the present invention is not limited to this, and the spacer member 13 may be disposed on the upstream side of the throttle body 19.

  In the above embodiment, the intake manifold 5 is made of 35% glass fiber reinforced polyamide 66 resin, but the material is not limited to this as long as it is made of resin.

  Furthermore, in the said embodiment, although the outer wall part 65 was formed separately from the chamber part 25, since the division | segmentation structure C should just include the outer wall part 65 at least, for example, the front side wall part of the chamber part 25 is included. 25e may be formed separately from other portions in the chamber portion 25, and the front side wall portion 25e and the outer wall portion 65 may be integrally formed to form the divided structure C.

  Moreover, in the said embodiment, although the intake device 3 was applied to the diesel engine, you may apply not only to this but to a gasoline engine.

  Furthermore, in the above embodiment, the resin molded body is sandwiched between the flange portion 55a of the inner wall portion 55 and the flange portion 65a of the outer wall portion 65 by sandwiching the flange portion 75a of the resin molded body (heat resistant inner layer 75). Although it fixed to the outer side wall part 65, after welding the resin molding to the outer side wall part 65, the flange part 55a of the inner side wall part 55 and the flange part 65a of the outer side wall part 65 are welded. Also good.

  Moreover, in the said embodiment, although the welding protrusion 75c of the resin molding was welded to the inner side protrusion 55b of the inner wall part 55, the flange part 75a of the resin molding is the flange part 55a of the inner wall part 55. And the flange portion 65a of the outer wall portion 65, the welding protrusion 75c need not be provided.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for an engine intake system or the like in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row.

DESCRIPTION OF SYMBOLS 1 Engine 3 Intake device 5 Intake manifold 7 Intercooler 11a, 11b, 11c, 11d Cylinder 15 Downstream branch pipe part 25 Chamber part 35 Upstream intake pipe part 43d Blocking part (collision wall member)
45 Intermediate intake pipe 45a Internal passage 55a Flange (welded part)
65 Outer wall part 65a Flange part (welded part)
75 Heat-resistant inner layer 93 EGR gas introduction pipe A Rear main body (main body)
B Front body part (main body part)
C Split structure

Claims (3)

In an intake system for an engine in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row,
The intake manifold is disposed on the outer surface of the intake side, which is one side in the width direction of the engine, and is disposed on the downstream side of the upstream intake pipe portion, and accommodates the intercooler and a downstream of the chamber portion. And a downstream branch pipe part communicating with each of the cylinders on the side, and an intermediate intake pipe part communicating with the chamber part and the downstream branch pipe part and forming a single passage that is curved outward in the engine width direction and extends in the vertical direction And having
The intercooler has an intercooler body portion built in the chamber portion so as to bisect the inside of the chamber portion in the engine width direction.
The upstream intake pipe portion communicates with a space portion located on the side closer to the engine in the chamber portion divided in the engine width direction, and the engine in the chamber portion divided in the engine width direction. The intermediate intake pipe communicates with the space located on the side away from the
Air sucked into the upstream intake pipe portion is introduced from the upstream intake pipe portion into a space portion located on the side near the engine in the chamber portion, and passes through the intercooler main body portion from the space portion to the engine. And is introduced into the space portion located on the side away from the space portion, and is introduced from the space portion through the intermediate intake pipe portion to the downstream branch pipe portion,
An EGR gas introduction pipe is connected to the outer wall portion, which is the outer portion in the engine width direction in the intermediate intake pipe portion,
Further, the intake manifold is formed by welding a resin main body portion and at least the outer wall portion of the intermediate intake pipe portion, the main body portion and a divided resin divided structure.
An engine air intake apparatus, wherein a heat resistant inner layer constituting a wall surface of an internal passage of the intermediate intake pipe portion is disposed on an inner surface side of an outer wall portion of the intermediate intake pipe portion. In an intake system for an engine in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row,
The intake manifold is disposed on the outer surface of the intake side, which is one side in the width direction of the engine, and is disposed on the downstream side of the upstream intake pipe portion, and accommodates the intercooler and a downstream of the chamber portion. And a downstream branch pipe part communicating with each of the cylinders on the side, and an intermediate intake pipe part communicating with the chamber part and the downstream branch pipe part and forming a single passage that is curved outward in the engine width direction and extends in the vertical direction And having
An EGR gas introduction pipe is connected to the outer wall portion, which is the outer portion in the engine width direction in the intermediate intake pipe portion,
Further, the intake manifold is formed by welding a resin main body portion and at least the outer wall portion of the intermediate intake pipe portion, the main body portion and a divided resin divided structure.
On the inner surface side of the outer wall portion of the intermediate intake pipe portion, a heat-resistant inner layer constituting the wall surface of the internal passage of the intermediate intake pipe portion is disposed,
The heat-resistant inner layer is formed of a resin molded body having a wall shape that matches the shape of the wall surface in the internal passage of the intermediate intake pipe portion, and is a welded portion between the outer wall portion of the intermediate intake pipe portion and the main body portion. An intake device for an engine, which is sandwiched between these two members on the inside. In an intake system for an engine in which a water-cooled intercooler is combined with an intake manifold of an engine having a plurality of cylinders arranged in a row,
The intake manifold is disposed on the outer surface of the intake side, which is one side in the width direction of the engine, and is disposed on the downstream side of the upstream intake pipe portion, and accommodates the intercooler and a downstream of the chamber portion. And a downstream branch pipe part communicating with each of the cylinders on the side, and an intermediate intake pipe part communicating with the chamber part and the downstream branch pipe part and forming a single passage that is curved outward in the engine width direction and extends in the vertical direction And having
An EGR gas introduction pipe is connected to the outer wall portion, which is the outer portion in the engine width direction in the intermediate intake pipe portion,
Further, the intake manifold is formed by welding a resin main body portion and at least the outer wall portion of the intermediate intake pipe portion, the main body portion and a divided resin divided structure.
On the inner surface side of the outer wall portion of the intermediate intake pipe portion, a heat-resistant inner layer constituting the wall surface of the internal passage of the intermediate intake pipe portion is disposed,
The EGR gas introduced from the EGR gas introduction pipe collides with the inside of the intermediate intake pipe portion where the EGR gas introduction pipe is connected, and the direction of the EGR gas is substantially orthogonal to the introduction direction. An engine air intake apparatus characterized in that a collision wall member for dispersing the air intake is provided at a substantially intermediate position of an internal passage of the intermediate intake pipe portion.

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