JP2018044518A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To warm up inner walls more efficiently and at an earlier stage in gas distribution portions for distributing an auxiliary gas to each of branch pipes.SOLUTION: An intake manifold 1 includes a surge tank 2, a plurality of branch pipes 3A-3C branched from the surge tank 2, gas distribution portions 11, 12 for distributing an auxiliary gas to each of the branch pipes 3A-3C, and a hot water passage portion 13 which is disposed adjacently to the gas distribution portions 11, 12 for warming up inner walls of the gas distributing portions 11, 12 and in which hot water flows. The gas distribution portions 11, 12 and the hot water passage portion 13 are extended in parallel with each other in a manner of crossing the respective branch pipes 3A-3C. The gas distribution portions 11, 12 include gas inlets, gas chambers and a plurality of gas distribution passages. The gas distribution portions 11, 12 and the hot water passage portion 13 are partitioned by walls 35, 36, and at least parts of the walls 35, 36 are heat transfer walls constituted of a material having heat conductivity higher than that of the other part.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an intake manifold having a plurality of branch pipes for distributing intake air to each cylinder of an engine. Specifically, a gas distributor for distributing auxiliary gas such as EGR gas or PCV gas to each branch pipe is provided. It relates to the provided intake manifold.

  Conventionally, as this type of technique, for example, an intake manifold described in Patent Document 1 below is known. The intake manifold includes a plurality of intake pipes (branch pipes) for distributing intake air to the cylinders, and an EGR chamber (gas distribution unit) for distributing EGR gas to the branch pipes. The gas distribution part is provided on the upper side of each branch pipe so as to straddle them in the transverse direction, and is formed integrally with the intake manifold. In addition, a recess in which EGR gas can stay is provided inside the gas distribution unit, and a hot water passage through which engine cooling water (hot water) flows is provided adjacent to the recess. Accordingly, a part of the EGR gas that has flowed into the gas distribution part stays in the recess. For this reason, the heat exchange action between the staying EGR gas and the hot water flowing through the hot water passage is increased, the EGR gas in the entire gas distribution section can be efficiently maintained, and the generation and freezing of condensed water in the gas distribution section can be prevented. Can be suppressed.

JP 2005-155448 A

  Incidentally, in the intake manifold described in Patent Document 1, although the heat exchange rate between the EGR gas and the hot water can be improved with a simple structure in which the recess of the gas distribution portion and the hot water passage are provided adjacent to each other, in recent years, In order to suppress the generation of condensed water at the section earlier, it is desired to further improve the heat exchange rate and warm the EGR gas early. In particular, in resin-made intake manifolds that have become common in recent years, the gas distribution part is integrally formed with the intake manifold and the resin, so there is a demand for an improved heat exchange rate with resin materials.

  Further, similarly to the EGR gas, it is conceivable to distribute other auxiliary gas (for example, PCV gas) to each branch pipe of the intake manifold, and there is a need to keep these auxiliary gases in the same manner.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to warm the inner wall more efficiently and quickly at a gas distribution portion for distributing auxiliary gas such as EGR gas to each branch pipe. It is to provide an intake manifold that enables the above.

  To achieve the above object, the invention described in claim 1 includes a surge tank, a plurality of branch pipes branched from the surge tank, and a gas distributor for distributing auxiliary gas to each of the plurality of branch pipes. A warm water passage section provided adjacent to the gas distribution section for warming the inner wall of the gas distribution section, through which hot water flows, and the gas distribution section and the hot water passage section extend in parallel across the plurality of branch pipes The gas distribution unit is provided with a gas inlet for introducing auxiliary gas, a gas chamber for collecting auxiliary gas introduced from the gas inlet, a plurality of gas distribution branches from the gas chamber and communicates with the branch pipes, respectively. In the intake manifold including the passage, the gas distribution portion and the hot water passage portion are separated by a wall, and at least a portion of the wall is made of a material having a higher thermal conductivity than the other portions. The purpose to be a.

  According to the configuration of the above invention, since the hot water passage portion is provided adjacent to the gas distribution portion, the heat of the hot water flowing through the hot water passage portion is transmitted to the inner wall of the gas distribution portion. Further, the wall portion separating the gas distribution portion and the hot water passage portion becomes a heat transfer wall made of a material having a higher thermal conductivity than the other portions, so that the heat of the hot water is transferred to the inner wall of the gas distribution portion. It becomes easy to be transmitted to.

  In order to achieve the above object, the invention according to claim 2 is the invention according to claim 1, wherein the hot water passage section has a rectangular cross section perpendicular to the longitudinal direction, and the long side of the rectangle is The purpose is to provide a heat transfer wall.

  According to the configuration of the invention, in addition to the action of the invention according to claim 1, since the heat transfer wall is provided on the long side of the rectangular section of the hot water passage portion, the area of the heat transfer wall becomes relatively large. The amount of heat that the inner wall of the gas distribution section has increases.

  In order to achieve the above object, according to a third aspect of the present invention, in the first or second aspect of the present invention, the hot water passage portion includes an outward path and a return path extending in two rows in the longitudinal direction along the heat transfer wall. A hot water inlet leading to the forward path and a warm water outlet leading to the backward path are provided on one end side in the longitudinal direction, the forward path and the return path are connected by a communication path on the other end side in the longitudinal direction, and the return path is disposed on the upper side of the forward path The purpose is that.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1 or 2, the flow path of the hot water passage section includes an outward path and a return path extending in two rows in the longitudinal direction along the heat transfer wall. The entire communication path is formed in a U shape. Therefore, compared with the cross-sectional area of the whole warm water passage part, the channel area of warm water becomes small, and the flow rate of warm water becomes relatively fast. In addition, since the return path is arranged on the upper side of the forward path, the air (bubbles) mixed in the forward path together with the hot water efficiently flows along the flow of buoyancy and hot water.

  In order to achieve the above object, according to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the plurality of branch pipes extend in the same direction in parallel from the surge tank and bend. The gas distribution portion and the hot water passage portion are formed inside the curved portion of each branch pipe.

  According to the configuration of the above invention, in addition to the operation of the invention according to any one of claims 1 to 3, the gas distribution portion and the hot water passage portion are disposed inside the curved portion of each branch pipe. And the hot water passage section do not protrude to the outside of the intake manifold.

  In order to achieve the above object, according to a fifth aspect of the present invention, in the first aspect of the present invention, the gas distribution unit is a first gas distribution unit that distributes the first auxiliary gas. And a second gas distribution part that distributes the second auxiliary gas, and the first gas distribution part and the second gas distribution part are arranged with the hot water passage part interposed therebetween.

  According to the configuration of the invention, in addition to the operation of the invention according to any one of claims 1 to 4, the first gas distribution part and the second gas distribution part are arranged with the hot water passage part interposed therebetween. Heat of the hot water is easily transmitted to the inner wall of the first gas distribution unit and the inner wall of the second gas distribution unit.

  According to the first aspect of the present invention, the inner wall of the gas distribution part for distributing the auxiliary gas to each branch pipe can be warmed more efficiently and quickly by the hot water. As a result, generation of condensed water and icing on the inner wall of the gas distribution unit can be prevented.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to effectively suppress the temperature drop of the auxiliary gas contacting the inner wall of the gas distributor.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the heat can be efficiently transmitted to the inner wall of the gas distribution section while reducing the heat loss of the hot water. Can be warmed more efficiently and quickly with hot water. Moreover, the air (bubbles) mixed in the warm water passage can be efficiently discharged from the warm water passage.

  According to the invention described in claim 4, in addition to the effects of the invention described in any one of claims 1 to 3, the intake manifold can be reduced in size, and the assembly of the intake manifold to the engine and the mounting in the vehicle can be achieved. Can be improved.

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, both the inner wall of the first gas distributor and the inner wall of the second gas distributor are heated by hot water. Furthermore, it can warm up efficiently and early.

The perspective view which concerns on one Embodiment and shows the front side of an intake manifold. The perspective view which concerns on one Embodiment and shows the back side of an intake manifold. The front view which concerns on one Embodiment and shows an intake manifold. The rear view which concerns on one Embodiment and shows an intake manifold. The top view which concerns on one Embodiment and shows an intake manifold. The bottom view showing an intake manifold concerning one embodiment. The right view which concerns on one Embodiment and shows an intake manifold. The left view which concerns on one Embodiment and shows an intake manifold. FIG. 6 is a cross-sectional view taken along line AA of FIG. 5 illustrating the intake manifold according to the embodiment. The BB sectional drawing of FIG. 5 which concerns on one Embodiment and shows an intake manifold. The CC sectional view taken on the line of FIG. 5 which shows an intake manifold according to one embodiment. FIG. 6 is a cross-sectional view taken along the line DD of FIG. 5 showing the intake manifold according to the embodiment. The EE sectional view taken on the line of FIG. 8 which shows an EGR gas distribution part concerning one Embodiment. The FF sectional view taken on the line of FIG. 8 which shows a warm water channel | path part concerning one Embodiment. The GG sectional view of Drawing 3 showing a PCV gas distribution part concerning one embodiment. The graph which shows the difference in the temperature change of (a) engine cooling water, (b) heat-transfer wall, and (c) the conventional resin wall at the time of the cold start of an engine concerning one embodiment. Sectional drawing according to FIG. 9 which concerns on another embodiment and shows an intake manifold.

  Hereinafter, an embodiment of an intake manifold according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing the front side of the intake manifold 1 of this embodiment. FIG. 2 is a perspective view of the back side of the intake manifold 1. FIG. 3 is a front view of the intake manifold 1. FIG. 4 is a rear view of the intake manifold 1. FIG. 5 is a plan view of the intake manifold 1. FIG. 6 also shows the intake manifold 1 in a bottom view. FIG. 7 also shows the intake manifold 1 in a right side view. FIG. 8 is a left side view of the intake manifold 1. 3 and FIG. 4 shows an arrangement state in which the intake manifold 1 is mounted on the engine, and the top, bottom, left and right thereof are as shown in FIG. 3 and FIG. The intake manifold 1 is used by being mounted on an engine in order to introduce intake air into a plurality of cylinders of the engine. The intake manifold 1 is entirely formed of resin, and includes a surge tank 2 and a plurality of branch pipes 3A, 3B, 3C branched from the surge tank 2. Each branch pipe 3A-3C is formed to extend from the surge tank 2 in parallel in the same direction and bend. In this embodiment, the intake manifold 1 has three branch pipes 3A to 3C corresponding to a three-cylinder engine.

  As shown in FIGS. 1 to 8, the surge tank 2 is provided with an intake inlet 4 for introducing intake air into the tank 2. An inlet flange 5 is provided on the outer periphery of the intake inlet 4. A known throttle device is connected to the inlet flange 5. A plurality of intake outlets 6A, 6B, and 6C are provided at the downstream ends of the branch pipes 3A to 3C for leading intake air toward the intake ports of the engine. An outlet flange 7 is provided on the outer periphery of the intake outlets 6A to 6C. The outlet flange 7 is connected to the engine.

  As shown in FIGS. 1-8, inside the curved part of each branch pipe 3A-3C, the gas distribution parts 11 and 12 for distributing auxiliary gas to each of each branch pipe 3A-3C, and gas distribution In order to warm the inner walls of the portions 11 and 12, a hot water passage portion 13 provided adjacent to the gas distribution portions 11 and 12 is provided. In this embodiment, the gas distribution units 11 and 12 include an EGR gas distribution unit 11 that distributes EGR gas and a PCV gas distribution unit 12 that distributes PCV gas. The EGR gas is a part of the exhaust discharged from the engine, is a gas recirculated to the engine, and corresponds to an example of the first auxiliary gas of the present invention. The EGR gas distribution unit 11 corresponds to an example of the first gas distribution unit of the present invention. PCV gas is blow-by gas leaking from the engine to the crankcase, and corresponds to an example of the second auxiliary gas of the present invention. The PCV gas distribution unit 12 corresponds to an example of the second gas distribution unit of the present invention. The EGR gas distribution unit 11 and the PCV gas distribution unit 12 are arranged with the hot water passage unit 13 interposed therebetween. The EGR gas distribution unit 11, the hot water passage unit 13, and the PCV gas distribution unit 12 extend in parallel across the branch pipes 3A to 3C. In this embodiment, the PCV gas distribution unit 12 is shared as the purge gas distribution unit 14 that distributes the purge gas. The purge gas is a gas once collected in the canister from the fuel gas evaporated from the fuel tank, purged into the engine and processed, and corresponds to an example of the second auxiliary gas of the present invention. The purge gas distribution unit 14 corresponds to an example of the second gas distribution unit of the present invention.

  As shown in FIGS. 1 to 8, the EGR gas distribution unit 11 is provided with an EGR gas inlet 16 for introducing EGR gas into the distribution unit 11. An inlet flange 17 is provided on the outer periphery of the EGR gas inlet 16. The inlet flange 17 is connected to a pipe of an EGR passage for flowing EGR gas to the EGR gas inlet 16.

  Further, a PCV gas inlet 18 for introducing PCV gas into the PCV gas distributor 12 is provided between the two branch pipes 3B and 3C. A PCV passage pipe is connected to the PCV gas inlet 18 via a PCV valve (see FIG. 10 described later for the cross-sectional shape of the PCV gas inlet 18). Further, a purge gas inlet 19 for introducing a purge gas into the distributor 12 (14) is provided at one end of the PCV gas distributor 12 (purge gas distributor 14). The purge gas inlet 19 is provided in the inlet fitting 20. The inlet pipe joint 20 is connected to a pipe for a purge gas passage.

  The hot water passage portion 13 is configured such that the cooling water circulating in the engine cooling water passage circulates as hot water. The hot water passage portion 13 is provided on one end side in the longitudinal direction thereof, adjacent to the EGR gas inlet 16, with a hot water inlet 21 and a hot water outlet 22 adjacent to each other. The hot water inlet 21 is provided in the inlet pipe joint 23, and the hot water outlet 22 is provided in the outlet pipe joint 24. The inlet pipe joint 23 and the outlet pipe joint 24 are connected to piping of the engine cooling water passage, respectively. Engine cooling water (warm water) is circulated through the warm water passage 13 through these pipes.

  FIG. 9 shows the intake manifold 1 by a cross-sectional view taken along line AA of FIG. FIG. 10 shows the intake manifold 1 by a cross-sectional view taken along the line BB of FIG. FIG. 11 shows the intake manifold 1 by a cross-sectional view taken along the line CC of FIG. FIG. 12 shows the intake manifold 1 in a sectional view taken along the line DD in FIG. As can be seen from FIGS. 9 to 12, the EGR gas distribution section 11, the hot water passage section 13, and the PCV gas distribution section 12 (purge gas distribution section 14) are partially different in cross-sectional shape in the longitudinal direction. Therefore, these cross-sectional shapes will be described below with reference to a typical FIG. As shown in FIG. 11, the PCV gas distribution part 12 (purge gas distribution part 14) is disposed closest to the surge tank 2, and the EGR gas distribution part 11 is closest to the outlet flange 7 of each branch pipe 3A to 3C. The hot water passage 13 is disposed between the gas distributors 11 and 12 (14).

  In FIG. 13, the EGR gas distribution part 11 is shown by the EE sectional view taken on the line of FIG. As shown in FIG. 11, the EGR gas distribution unit 11 has a substantially rectangular cross section perpendicular to the longitudinal direction. As shown in FIG. 13, the EGR gas distribution unit 11 includes an EGR gas chamber 26 that temporarily collects EGR gas adjacent to the EGR gas inlet 16, and a branch from the EGR gas chamber 26. Three gas distribution passages 27A, 27B, and 27C (portions indicated by different arrows) that respectively communicate with 3C are provided. The EGR gas chamber 26 and the gas distribution passages 27A to 27C are partitioned by walls 28a, 28b, and 28c. As shown in FIGS. 11 and 13, nozzles 29a, 29b, and 29c communicating with the branch pipes 3A to 3C are provided on the outlet sides of the gas distribution passages 27A to 27C.

  FIG. 14 shows the hot water passage portion 13 by a cross-sectional view taken along line FF in FIG. As shown in FIG. 11, the hot water passage portion 13 has a rectangular cross section orthogonal to the longitudinal direction, and the long side of the rectangle is disposed adjacent to the EGR gas distribution portion 11 and the PCV gas distribution portion 12. As shown in FIG. 14, the hot water passage portion 13 includes an outward path 31 and a return path 32 extending in two rows in the longitudinal direction along the walls 35 and 36. The outbound path 31 and the inbound path 32 are partitioned by a wall 33, and the inbound path 32 is disposed above the outbound path 31. On one end side in the longitudinal direction of the hot water passage portion 13, a hot water inlet 21 leading to the forward path 31 and a hot water outlet 22 leading to the return path 32 are provided. Further, the other end side in the longitudinal direction of the hot water passage portion 13 is formed in a U shape as a whole passage by connecting the forward path 31 and the return path 32 by the communication path 34. As shown in FIG. 11, the EGR gas distribution unit 11 and the hot water passage unit 13 are separated by a wall 35. In this embodiment, only the portions of the walls 35 and 36 are heat transfer walls made of a material having better thermal conductivity than the other portions. In this embodiment, the carbon powder is mixed into the resin material, so that the heat transfer wall portion has a higher thermal conductivity than the other portions. 9 to 12, the heat transfer wall portion is provided with ridges.

  FIG. 15 shows the PCV gas distribution unit 12 (purge gas distribution unit 14) by a cross-sectional view taken along the line GG of FIG. As shown in FIGS. 10 and 11, the PCV gas distribution unit 12 has an irregular cross section orthogonal to the longitudinal direction, and one side of the irregular shape is disposed adjacent to the hot water passage unit 13. The PCV gas distribution unit 12 is separated from the hot water passage unit 13 through a wall 36, and the wall 36 is also formed of a heat transfer wall similar to the above. As shown in FIGS. 10 and 15, a PCV gas chamber 41 for temporarily collecting PCV gas (purge gas) adjacent to the PCV gas inlet 18 and the purge gas inlet 19 inside the PCV gas distributor 12, and a PCV gas chamber There are provided three gas distribution passages 42A, 42B, 42C (parts indicated by different arrows) branched from 41 and communicating with the respective branch pipes 3A-3C. The PCV gas chamber 41 and the gas distribution passages 42A to 42C are partitioned by a wall 43 and the like. As shown in FIGS. 11 and 15, communication holes 44a, 44b, and 44c communicating with the branch pipes 3A to 3C are provided on the outlet sides of the gas distribution passages 42A to 42C.

  According to the configuration of the intake manifold 1 of this embodiment described above, since the hot water passage portion 13 is provided adjacent to the EGR gas distribution portion 11, the heat of the hot water flowing through the hot water passage portion 13 is reduced in the EGR gas distribution portion 11. It is transmitted to the inner wall. For this reason, the EGR gas distribution part 11 can warm the inner wall with warm water. Moreover, since the part of the wall 35 which separates between the EGR gas distribution part 11 and the warm water channel | path part 13 becomes a heat-transfer wall comprised with the material whose heat conductivity is better than another part, Is easily transmitted to the inner wall of the EGR gas distribution unit 11. For this reason, in the EGR gas distribution part 11, the inner wall can be warmed with warm water more efficiently and early. As a result, generation of condensed water and freezing on the inner wall of the EGR gas distribution unit 11 can be prevented.

  FIG. 16 shows (a) engine cooling water (shown by a broken line), (b) heat transfer wall (shown by a solid line), and (c) a conventional resin wall (shown by a one-dot chain line) during cold start of the engine. The difference in temperature change is indicated by a graph. As shown in FIG. 16 (a), when the engine is cold started, the engine coolant gradually rises and reaches the upper limit temperature (about 90 ° C.) after about 450 seconds. On the other hand, as shown in FIGS. 16B and 16C, the heat transfer wall and the conventional resin wall reach the upper limit temperature after about 500 seconds, but the upper limit temperature of the conventional resin wall is “about 25 ° C. In contrast, the upper limit temperature of the heat transfer wall is “about 63 ° C.”, which indicates that the heat transfer wall has a clearly higher thermal conductivity than the conventional resin wall.

  According to the configuration of this embodiment, since the heat transfer walls (walls 35 and 36) are provided on the long side of the rectangular cross section of the hot water passage portion 13, the area of the heat transfer wall becomes relatively large, and EGR gas distribution is performed. The amount of heat that the inner wall of the part 11 has increases. As a result, the temperature drop of the EGR gas that contacts the inner wall can be effectively suppressed.

  According to the configuration of this embodiment, the flow path of the hot water passage section 13 includes the forward path 31 and the return path 32 extending in two rows in the longitudinal direction along the heat transfer walls (walls 35 and 36), and the communication path 34 connecting them. As a result, the whole is formed into a U-shape. Therefore, since the flow area of the hot water is smaller than the cross-sectional area of the entire hot water passage portion 13, the flow rate of the hot water is relatively increased. For this reason, it is possible to efficiently transmit the hot water heat to the inner wall of the EGR gas distribution unit 11 while reducing the heat loss of the hot water, and it is possible to warm the inner wall more efficiently and quickly with the hot water. In addition, since the return path 32 is arranged on the upper side of the forward path 31, air (bubbles) mixed with the warm water from the warm water inlet 21 together with the warm water efficiently flows to the return path 32 along the flow of buoyancy and warm water, and the warm water outlet 22 will flow out. For this reason, the air (bubbles) mixed in the hot water passage portion 13 can be efficiently discharged from the hot water passage portion 13.

  According to the configuration of this embodiment, since the EGR gas distribution unit 11 and the PCV gas distribution unit 12 (purge gas distribution unit 14) are arranged with the hot water passage unit 13 interposed therebetween, the heat of the hot water is transferred to the inner wall of the EGR gas distribution unit 11. And easily transmitted to the inner wall of the PCV gas distributor 12 (purge gas distributor 14). For this reason, both the inner wall of the EGR gas distribution unit 11 and the inner wall of the PCV gas distribution unit 12 (purge gas distribution unit 14) can be warmed more efficiently and quickly by the hot water. That is, the inner wall of the PCV gas distribution unit 12 (purge gas distribution unit 14) can be warmed more efficiently and quickly with hot water, like the inner wall of the EGR gas distribution unit 11 described above.

  According to the configuration of this embodiment, the EGR gas distribution unit 11, the PCV gas distribution unit 12 (purge gas distribution unit 14), and the hot water passage unit 13 are disposed inside the curved portions of the curved branch pipes 3A to 3C. Therefore, the EGR gas distribution part 11, the PCV gas distribution part 12 (purge gas distribution part 14), and the hot water passage part 13 do not protrude to the outside of the intake manifold 1. In this sense, the intake manifold 1 can be reduced in size, and the assembling property of the intake manifold 1 with respect to the engine and the mounting property in the vehicle can be improved.

  In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

  (1) In the said embodiment, as shown by the scissors in FIG. 9, only the part of walls 35 and 36 was made into the heat-transfer wall comprised with the material whose heat conductivity is better than another part. On the other hand, as shown by a scissors in the cross-sectional view of FIG. 17, the portion of the wall 37 constituting the EGR gas distribution unit 11 can also be a heat transfer wall made of a material having good thermal conductivity. According to this configuration, the entire inner wall of the EGR gas distribution unit 11 can be quickly warmed.

  (2) In the said embodiment, although the heat-transfer wall was comprised by mixing carbon powder with the resin material which is a base material, a heat-transfer wall can also be comprised by insert-molding a metal plate to resin.

  (3) In the above-described embodiment, the present invention is embodied in the intake manifold 1 including the three branch pipes 3A to 3C. However, the number of branch pipes may be a plurality other than three.

  (4) Although the detailed configuration of the intake manifold 1 has not been described in the above embodiment, the intake manifold can be configured integrally by joining a plurality of pieces.

  (5) In the said embodiment, it comprised so that the cooling water which circulates through an engine cooling water path to the hot water channel | path part 13 was circulated as warm water. On the other hand, the hot water that has passed through the exhaust heat recovery device (provided in the exhaust passage) from the engine cooling water passage can be circulated to the hot water passage portion.

  The present invention can be used as a component of the intake system for various types of engines.

DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Surge tank 3A Branch pipe 3B Branch pipe 3C Branch pipe 11 EGR gas distribution part (gas distribution part, 1st gas distribution part)
12 PCV gas distributor (gas distributor, second gas distributor)
13 Hot water passage section 14 Purge gas distribution section (gas distribution section, second gas distribution section)
16 EGR gas inlet 18 PCV gas inlet 19 Purge gas inlet 21 Hot water inlet 22 Hot water outlet 26 EGR gas chamber 27A Gas distribution passage 27B Gas distribution passage 27C Gas distribution passage 31 Outward passage 32 Return passage 34 Communication passage 35 Wall (heat transfer wall)
36 wall (heat transfer wall)
37 walls (heat transfer walls)
41 PCV gas chamber 42A Gas distribution passage 42B Gas distribution passage 42C Gas distribution passage

Claims (5)

A surge tank; a plurality of branch pipes branched from the surge tank; a gas distribution part for distributing auxiliary gas to each of the plurality of branch pipes; and the gas distribution part for warming an inner wall of the gas distribution part A hot water passage portion through which hot water flows, and the gas distribution portion and the hot water passage portion are provided to extend in parallel so as to cross the plurality of branch pipes. An intake manifold including a gas inlet for introducing gas, a gas chamber for collecting auxiliary gas introduced from the gas inlet, and a plurality of gas distribution passages branched from the gas chamber and communicating with the branch pipes, respectively. In
The gas distribution part and the hot water passage part are separated by a wall, and at least a part of the wall is a heat transfer wall made of a material having a higher thermal conductivity than the other part. Intake manifold.   2. The intake manifold according to claim 1, wherein the hot water passage portion has a rectangular cross section orthogonal to a longitudinal direction thereof, and the heat transfer wall is provided on a long side of the rectangle.   The warm water passage section includes a forward path and a return path extending in two rows in the longitudinal direction along the heat transfer wall, and a hot water inlet leading to the forward path and a warm water outlet leading to the return path are provided on one end side in the longitudinal direction. The intake manifold according to claim 1 or 2, wherein the forward path and the return path are connected by a communication path on the other end side in the longitudinal direction, and the return path is disposed above the forward path.   The plurality of branch pipes are formed so as to bend in parallel in the same direction from the surge tank, and the gas distribution section and the hot water passage section are disposed inside the curved portion of each branch pipe. The intake manifold according to any one of claims 1 to 3.   The gas distribution unit includes a first gas distribution unit that distributes a first auxiliary gas and a second gas distribution unit that distributes a second auxiliary gas, and the first gas distribution unit and the second gas distribution unit The intake manifold according to any one of claims 1 to 4, wherein a gas distribution part is arranged with the hot water passage part interposed therebetween.

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