JP2019060284A - Intake manifold - Google Patents

Abstract

To provide an intake manifold including an EGR gas distribution passage and a PCV gas distribution passage, for actualizing a structure excellent in the uniformity of distribution to each intake branch pipe while reducing its weight.SOLUTION: A gas introduction pedestal 18 having an EGR gas inlet hole 18 and a PCV gas inlet is integrally formed on the surface part of a group of intake branch pipes 6a-6d. A PCV gas distribution passage 15 formed on the surface part of an intake manifold 2 has a tournament shape with an upper cover member blocking grooves 24, 25, 26. An EGR gas distribution passage formed on the reverse part of the intake manifold 2 has a tournament shape. Since the EGR gas inlet hole 18 and the PCV gas inlet 19 are formed in one gas introduction pedestal 17, structural elements are used in common to reduce the weight while improving the strength of the intake manifold 2.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an intake manifold in an internal combustion engine for vehicles and the like, and in particular, a synthetic resin intake manifold is a suitable target.

  Intake manifolds for internal combustion engines have recently been made of synthetic resin for weight reduction, cost reduction, etc. However, since the intake manifold is curved and can not be molded into a hollow structure by mere injection molding (can not be punched out), injection is Several parts manufactured by the forming method are integrally joined and manufactured by welding, such as a vibration welding method.

  On the other hand, in internal combustion engines for vehicles, it is widely practiced to recirculate EGR gas, which is a part of exhaust gas, to an intake system for the purpose of promoting purification of exhaust gas and the like. In addition, it is also widely practiced to recirculate PCV gas (blow-by gas) blown into the crank chamber to the intake system. Furthermore, it is also widely practiced to collect volatile fuel (purge gas) generated in a fuel tank with a canister and supply it to an intake system.

  Patent Document 1 discloses that the PCV gas distribution passage and the EGR gas distribution passage are disposed close to each other for the purpose of preventing water freezing in the PCV gas distribution passage, as shown in FIG. In the embodiment, it is disclosed that the PCV gas distribution passage and the EGR gas distribution passage are arranged side by side on the outer surface of the intake manifold, and in the second embodiment of FIGS. It is disclosed that a PCV gas distribution passage is provided on the outer surface of the curved portion to form an EGR gas distribution passage on the inside.

JP, 2013-151906, A

  In Patent Document 1, in either the first embodiment or the second embodiment, the inlet of the PCV gas distribution passage and the inlet of the EGR gas distribution passage are provided at positions separated from each other, and the line of the intake branch pipes It opens in the direction of the direction.

  And in the first embodiment, since both the PCV gas distribution passage and the EGR gas distribution passage are branched from the outlet hole from one main passage, the gas tends to flow strongly toward the back of the main passage. Because of this, a large amount of gas tends to flow into the intake branch located at the back of the main passage, and the distribution to each intake branch may be uneven. In addition, because the inlets of the two passages are separated, there is also a concern of increased weight.

  On the other hand, in the second embodiment, since it is understood that the PCV gas distribution passage is branched into a tournament shape, it is possible to achieve uniform distribution of the PCV gas as compared with the first embodiment. For the channels, distribution non-uniformity has not been eliminated, and the problem of weight gain due to the inlets being separated from each other still remains.

  The present invention has been made to improve the present situation, and an intake manifold having a PCV gas distribution passage is provided with an improved intake manifold such as weight reduction without lowering the strength. It is

  The intake manifold according to the present invention comprises a group of intake manifolds aligned in the crankshaft direction, and adjacent intake manifolds are connected to each other, so that the group of intake manifolds is the same as the intake manifold. It has the basic composition that it has the surface part and the back part which spread in the longitudinal direction and the alignment direction of the above.

  In the first aspect of the invention, in the basic configuration, the inlet of the EGR gas distribution passage and the inlet of the PCV gas distribution passage are formed in any one of the front surface portion and the rear surface portion in the group of intake manifolds. The integrated gas introduction pedestal is integrally formed.

The present invention can be embodied in many ways. As an example, in claim 2,
The gas introduction base has a front surface facing in a direction intersecting the arranging direction of the intake branch pipes, and left and right side surfaces facing in the arranging direction of the intake branch pipes.
The PCV gas distribution passage is provided with an inlet hole opened in front of the gas introduction pedestal,
The inlet of the PCV gas distribution passage is formed on either one of the left and right side surfaces of the gas introduction pedestal and opens in the direction in which the intake manifolds are arranged, and the PCV gas of the gas introduction pedestal is opened. On the side where the inlet of the distribution passage is provided, a chamber chamber which is the beginning of the PCV gas distribution passage is formed to be laterally separated from the inlet hole of the EGR gas distribution passage.

In the invention of claim 3, in claim 1 or 2,
The gas introduction base has a front surface facing in a direction intersecting the arranging direction of the intake branch pipes, and left and right side surfaces facing in the arranging direction of the intake branch pipes.
The PCV gas distribution passage is provided with an inlet hole opened in front of the gas introduction pedestal,
The PCV gas distribution passage has a horizontally long branched passage in a posture crossing the inlet hole of the EGR gas distribution passage, and the horizontally long branched passage is closed by a lid member with a long groove formed in the group of the intake branch pipes. With this configuration, the transverse distribution passage of the PCV gas distribution passage and the inlet hole of the EGR gas distribution passage cross each other in a mutually separated state.

  In the present invention, since the inlet of the PCV gas distribution passage and the inlet of the EGR gas distribution passage are provided in one gas introduction base, the members can be made common to contribute to weight reduction. In addition, since the gas introduction pedestal also functions as a reinforcing rib, it can contribute to the improvement of the strength of the intake manifold. Moreover, since the connection part of the PCV gas tube and the connection part of the EGR pipe are close to each other, the check and inspection of the connection state can be performed quickly.

  Furthermore, since the gas introduction pedestal is formed on the front surface or the back surface of the group of intake manifolds, both the PCV gas distribution passage and the EGR gas distribution passage are branched from the EGR gas distribution passage to the left and right to form a tournament shape. It is easy to form, and therefore it is easy to realize equally distributing PCV gas and EGR gas to each intake branch.

  If the chamber for the PCV gas is provided as in claim 2, the directivity of the flow of the PCV gas can be eliminated to improve the distribution performance. And since a chamber chamber is formed in a gas introduction pedestal, it can contribute not only to weight reduction and cost reduction, but also strength reduction is not caused by the rib effect.

  According to the third aspect of the present invention, one gas introduction pedestal can be used three-dimensionally to form the cross center distribution passage of the PCV gas distribution passage and the inlet hole of the EGR gas distribution passage. Therefore, it can be easily realized that the PCV gas distribution passage and the EGR gas distribution passage are formed into a tournament shape branched sequentially from the inlet.

It is a figure which shows embodiment and is the isolation | separation side view seen from the crankshaft direction. (A) is a top view, (B) is a BB sectional view of (A). It is a bottom view in the state where a lower lid member was removed. It is the perspective view seen from the top. It is the perspective view seen from the lower part. It is a figure which shows the surface part in the state which removed the upper cover member, (A) is a top view, (B) is a perspective view. It is a top view which shows the arrangement | positioning relationship between a PCV gas distribution passage and an EGR gas distribution passage. (A) is a sectional view taken along the line VIII-VIII in FIG. 2, (B) is a bottom view of the upper cover member, (C) is a bottom view of the lower cover member. (A) is a sectional view taken along the line IXA-IXA in FIG. 3, (B) is a sectional view taken along the line IXB-IXB in FIG.

(1). Basic Structure Next, an embodiment of the present invention will be described based on the drawings. First, an outline will be described. The present embodiment is applied to an intake manifold of an internal combustion engine for a vehicle. The internal combustion engine to be applied is the same slant type as that disclosed in JP-A-2017-120088, and the axis of the cylinder bore is greatly inclined so as to form an angle of about 30 degrees with respect to the horizontal. For this reason, as shown only in part in FIG. 1, the intake side surface 1 a of the cylinder head 1 is upward in a substantially horizontal posture.

  As shown in FIG. 1, the intake manifold 2 is provided with an upper member 3 and a lower member 4 as main elements, and by joining them together by vibration welding, as shown in FIGS. It is formed in the hollow structure which has 5 and four intake branch pipes 6a-6d branched from this. Since four intake branch pipes 6a to 6d are provided, the internal combustion engine of the embodiment has four cylinders.

  The intake branch pipes 6a to 6d are arranged in the crankshaft direction (cylinder line direction), but the first intake branch pipe 6a, the second intake branch pipe 6b, the third intake branch pipe 6c, and the fourth intake branch pipe are arranged sequentially from one end of the line. The intake branch pipe 6d will be called. The intake manifold 2 basically has a posture close to horizontal although there is a bend.

  In the present embodiment, in order to specify the direction, for convenience, the direction in which the intake branch pipes 6a to 6d are arranged (crank axis direction) is referred to as the left-right direction, and the flow direction of intake is referred to as the front-rear direction. In the internal combustion engine, generally, the crankshaft direction is referred to as the front-rear direction, but the direction of the present embodiment is different from this general direction.

  As can be understood from FIGS. 1, 4 and 5, adjacent intake branch pipes 6a to 6d are integrally connected. Therefore, the intake manifold 2 has a front surface portion and a back surface portion which are spread in the longitudinal direction and the line direction of the intake branch pipes 6a to 6d, but in the present embodiment, the upper surface portion is called a surface portion and the lower surface The part will be called the back part.

  The group of intake branch pipes 6a to 6d constituting the intake manifold 2 includes, in order from the upstream side, a lower horizontal portion 7 and a bent portion 8 which rises upward and then changes its direction downward. The horizontal portion 7 and the bent portion 8 are smoothly continuous. A flange 9 fixed to the cylinder head 1 is provided at the tip of the bent portion 8, and the flange 9 is formed on the lower member 4.

  As shown in FIGS. 2 to 5, in the lower horizontal portion 7, the intake branch pipes 6 a to 6 d are in close contact with each other and are in a bundle state, and in the bent portion 8, the intervals gradually increase. In order to equalize the amount of intake air to each cylinder, it is necessary to make the lengths of the intake branch pipes 6a to 6d as constant as possible. On the other hand, as shown in FIGS. 2 and 3, the surge tank 5 is close to the side of the first intake branch pipe 6a and left and right unsymmetrical. Therefore, by changing the heights of the intake branch pipes 6a to 6d at the bent portion 8, the lengths of the intake branch pipes 6a to 6d are equalized as much as possible.

  The surge tank 5 is provided with an intake pedestal 10 to which a throttle body (not shown) is attached. The intake pedestal 10 opens obliquely upward. A purge gas inflow port 11 and a suction port 12 for the brake booster are provided in the surge tank 5 so as to protrude in the left-right direction. The suction port 12 for the brake booster is surrounded by the cover 13 from below.

  The present embodiment includes, for example, the PCV gas distribution passage 15 shown in FIG. 4 and the EGR gas distribution passage 16 shown in FIG. 3, for example. The EGR gas and the PCV gas have flow rates equal to each other. It is discharged to the end of 6a-6d.

(2) Gas introduction pedestal For example, as shown in FIGS. 2 and 4, the gas introduction pedestal 17 for taking in the EGR gas and the PCV gas is generally provided at the rising portion of the third intake branch pipe 6c in the bending portion 8. It is provided integrally. The gas introduction pedestal 17 projects generally forward from the rising portion of the third intake branch pipe 6c, and an EGR gas inlet hole 18 which opens forward and a cylindrical PCV gas inlet 19 which protrudes leftward are formed. ing. Needless to say, a PCV tube is connected to the PCV gas inlet 19.

  The gas introduction pedestal 17 is provided at the location of the third intake branch pipe 6c, but in the relationship between the outlet of the first intake branch pipe 6a and the outlet of the fourth intake branch pipe 6d, doing. That is, in the present embodiment, the intake manifold 2 does not have a symmetrical shape, and in the intake manifold 2 the spread to the side of the fourth intake branch pipe 6d is large, so the EGR gas inlet hole 18 is taken as the first intake branch pipe. As a result of being located at the left and right intermediate portions between the outlet of 6a and the outlet of the fourth intake branch pipe 6d, the gas introduction pedestal 17 is located at the location of the third intake branch pipe 6c.

  When the intake manifold 2 has a symmetrical shape, the gas introduction pedestal 17 may be disposed so as to straddle the second intake branch pipe 6b and the third intake branch pipe 6c. The left and right positions of the gas introduction pedestal 17 are set due to manufacturing problems, and the location can be set as needed.

  As described above, the gas introduction pedestal 17 largely protrudes to the front side of the bend 8 and slightly protrudes above the bend 8 as can be understood from FIGS. 1 and 10. In addition, the front surface of the gas introduction pedestal 17 is an inclined surface that is inclined rearward so as to be slightly shifted downward toward the front.

  The gas introduction base 17 has a bracket portion 20 to which a flange of an EGR pipe (not shown) is connected, and three vertical ribs 21 integrally connected to the bracket portion 20. The bracket portion 20 is a substantially rhombus in the vertical direction in a front view, and the upper end is inclined toward the first intake branch pipe 6a and the lower end is inclined toward the fourth intake branch pipe 6d. The EGR gas inlet hole 18 is open at the upper and lower intermediate portions of the bracket portion 20, and the tap holes 22 for fixing the flange of the EGR pipe with a screw are open at the upper end and the lower end.

  Since the bracket portion 20 is located at the upper part of the bent portion 8, there is a possibility that high strength can not be secured only by projecting the bracket portion 20. Furthermore, if the bracket portion 20 is extended as it is downward to reach the bent portion 8, high strength can be secured, but the amount of use of the synthetic resin which is the material of the upper member 3 increases excessively and cost and weight increase. There is a possibility that distortion may easily occur due to an excessive difference in thickness.

  On the other hand, if the structure which supports the bracket part 20 from the lower part with the rib 21 like this embodiment is adopted, the amount of use of the synthetic resin can be suppressed while securing high strength, and the cost and weight can be suppressed. Also, the generation of distortion can be prevented and the processing accuracy can be improved.

  When the bracket portion 20 is inclined in a front view, the left and right width of the bracket portion 20 is expanded, so the left and right width of the group of ribs 21 is also expanded. Therefore, the group of ribs 21 is in a state of being strongly stepped, which can further contribute to the improvement of the strength. The number of ribs 21 is not limited to three, and may be one or two or four or more. However, since the lateral width of the gas introduction pedestal 17 is several tens mm, about three as in the embodiment is the most reasonable.

(3). PCV gas distribution passage A thick portion 23 is formed on the left side of the left and right sides of the gas introduction pedestal 17 located on the side of the first intake branch pipe 6a and near the base portion. The PCV gas inlet 19 is laterally provided in a substantially horizontal posture on the thick portion 23 (the thick portion 23 may not be provided).

  The PCV gas inlet 19 is located above the EGR gas inlet hole 18. Then, as shown in FIG. 6A, a PCV first groove 24 communicating with the PCV gas inlet 19 is formed on the upper surface of the gas introduction pedestal 17 as a part of the PCV gas distribution passage 15. The PCV first groove 24 corresponds to the chamber described in the claims.

  As shown in FIG. 6A, the PCV gas distribution passage 15 includes the PCV first groove 24, the PCV second groove 25 in plan view L-shaped branched from the PCV first groove 24 to the left and right, and the PCV second groove. The PCV gas distribution passage 15 is formed by closing the grooves 24, 25 and 26 with the upper lid member 27. At the end of each PCV third groove 26, an outlet hole 28 opened toward the intake branch pipes 6a to 6d is in communication.

  Therefore, most of the PCV gas distribution passage 15 is constituted by the grooves 24 25 26. Further, one first branch portion 29 in which the PCV first groove 24 and the PCV second groove 25 communicate with each other, and two second branch portions 30 in which the PCV second groove 25 and the PCV third groove 26 communicate with each other It has a tournament shape (branching shape) as a whole. Therefore, the PCV gas can be equally distributed to the intake branch pipes 6a to 6d. The upper cover member 27 also has a tournament shape.

  More precisely, in the case of a four-stroke four-cylinder internal combustion engine, each cylinder exhibits an intake stroke at an interval of 180 degrees in the rotational angle of the crankshaft, so PCV gas has one PCV first groove 24 and the other PCV first. It flows into any of the grooves 24 and further flows into any one of the pair of left and right PCV third grooves 26. However, when the PCV gas distribution passage 15 has a tournament shape as a whole, each intake branch pipe 6a Since the flow resistance of the flow path to 6d becomes constant, it is possible to equalize the suction amount of the PCV gas by the intake branch pipes 6a to 6d (this point is the same as the EGR gas distribution passage 16). .

  A flat surface 31 is formed on the surface of the upper member 3 so as to surround the grooves 24, 25 and 26, and the upper lid member 27 is welded to the flat surface 31. The bottom surfaces of the PCV second groove 25 and the PCV third groove 26 are inclined so as to be gradually lower toward the downstream. For this reason, even if the water contained in the PCV gas is condensed, the water does not flow into the intake branch pipes 6a to 6d and is not accumulated. Therefore, it is possible to prevent the problem that the condensed water accumulated during operation freezes and freezes to block the PCV passage, or the water freezes at the time of operation stop and the like and this flows into the cylinder at the start.

  The bottom surface of the PCV first groove 24 increases in height from upstream to downstream. This is because the height of the PCV gas inlet 19 is low. For example, as shown in FIGS. 8B and 9B (see also FIG. 2B), the groove 32 and the protrusion 33 are provided on the lower surface of the upper lid member 27 at a portion facing the PCV groove. To adjust the cross-sectional area of the PCV passage to be substantially constant (it is also possible to adjust the cross-sectional area to change).

  The groove 32 gradually decreases in depth from the upstream toward the downstream, and the protrusion 33 is formed so as to increase in height from the start to the end. In FIG. 8 (B), the groove 32 is represented by hatching, and the protrusion 33 is represented by parallel hatching. As shown in FIG. 8B, the groove 32 is a portion of the upper lid member 27 facing the PCV first groove 24, a portion on the upstream side of the PCV second groove 25, and the first intake branch. It is formed in the downstream part of the PCV third groove 26 facing the pipe 6a and the third intake branch pipe 6c, and a protrusion 33 is formed in the remaining part.

  While the group of the PCV second groove 25 and the PCV third groove 26 is inclined toward the downstream as a whole by the groove 32 and the ridge 33, the cross-sectional area is adjusted to be constant over the entire length. . In addition, the cross-sectional area of the PCV first groove 24 is made uniform over the entire length. Although the left and right PCV second grooves 25 have different lengths, the PCV with a long length can be obtained by adjusting the depth of the groove 32 and the height of the ridges 33 so that the flow rate becomes even. It is also possible to set so that the cross-sectional area of the 2nd groove 25 may become large.

  The PCV second groove 25 extends laterally across the intake branch pipes 6a to 6d (long in the direction in which the intake branch pipes 6a to 6d are aligned) a laterally long portion 25a, a first intake branch pipe 6a, and a second intake branch It has a vertically extending portion 25b located at the valley between the pipe 6b and the valley between the third intake branch 6c and the fourth intake branch 6d. The horizontal portion 25a corresponds to the horizontal distribution passage described in the claims.

  Then, since the horizontally long portion 25 a of the PCV second groove 25 is located on the front side of the vertex of the bent portion 8, the horizontally long portion 25 a is projected onto the bent portion 8 even if the upper lid member 27 is included. On the other hand, since the longitudinally long portion 25b is located in the valley between the adjacent intake branch pipes 6a to 6d, it also projects above the apex of the bend 8 even if the upper lid member 27 is included. Not. Therefore, the height of the intake manifold 2 is not increased due to the formation of the PCV gas distribution passage 15, and the enlargement can be prevented.

  The left and right PCV third grooves 26 are branched into V-shapes from the PCV second grooves 25, but the PCV third grooves 26 have a short length, and as shown in FIG. 7 (see also FIG. 2), the outlet hole 28 Is located at the left end portion or the right end portion of the inner peripheral surface of the intake branch pipes 6a to 6d.

  When the outlet holes 28 are positioned at the left and right middle portions of the intake branch pipes 6a to 6d, the PCV third groove 26 must be positioned at the apex of each intake branch pipe 6a to 6d, and the PCV third groove 26 is provided. When the upper lid member 27 is closed, the portion of the PCV third groove 26 protrudes more than the apex of the bent portion 8. However, as in the present embodiment, the outlet hole 28 is the left end of the intake branch pipes 6a to 6d. When located at a portion or the right end, the PCV third groove 26 does not need to be disposed so as to cross the intake branch pipes 6a to 6d, so that the location of the PCV third groove 26 is higher than the vertex of the bent portion 8. It can prevent and the enlargement of the intake manifold 2 can be prevented.

  In addition, as shown in FIG. 10, although the exit hole 28 is a form long in the up-down direction, this is a basic mold of the upper member 3, a mold overlapping the upper surface and a mold overlapping the lower surface. In the manufacture by the injection molding method, it is attributed to the fact that the exit hole 28 is formed by the basic mold.

  That is, it is possible to lower the end of the PCV second groove 25 and the height of the PCV third groove 26 so as to be closer to the valley in the intake manifold 2. In this case, the outlet hole 28 is inclined. In this posture, it can not be formed by the basic mold, and a slide pin must be separately provided to form the exit hole 28. However, as in the present embodiment, the end of the PCV second groove 25 and the PCV second If the height of the three groove 26 is increased and the end of the PCV third groove 26 is slightly overlapped with the edges of the intake branch pipes 6a to 6d in plan view, the outlet hole 28 It can be formed by the basic mold in a state where it is possible.

  In the embodiment, the PCV gas inlet 19 and the PCV first groove 24 are orthogonal to each other in plan view. For this reason, the PCV gas sent from the PCV gas inlet 19 loses its directionality by colliding with the PCV first groove 24, and the PCV first groove 24 stores the PCV gas in a buffer space (chamber chamber). Act as. For this reason, the inflow of the PCV gas to each cylinder can be equalized by eliminating the unevenness of the flow of the PCV gas.

(4) EGR gas distribution passage The EGR gas distribution passage 16 includes left and right EGR first grooves 35 communicating with the EGR gas inlet hole 18, and an EGR second groove 36 branched left and right from the end of the EGR first groove 35 The EGR gas distribution passage 16 is configured by closing the grooves 35 and 36 with the lower lid member 37 from below. For example, as shown in FIG. 9A, each EGR second groove 36 is formed with an outlet hole 38 opened toward the inside of the intake branch pipes 6a to 6d.

  The EGR first grooves 35, 36 are formed in the lower member 4, and a flat surface 39 is formed so as to surround the respective grooves 35, 36. The lower lid member 37 is welded to the flat surface 39, and forms a ridge 40 which enters the grooves 35 and 36. As shown in FIGS. 8A and 9A, the EGR second groove 36 is lower than the EGR first groove 35, and the EGR gas distribution passage 16 is lowered toward the downstream as a whole. While the flat surfaces 39 are coplanar at the same height. Therefore, the cross-sectional area is adjusted by changing the height so that the height of the protrusion 40 is high at the portion of the EGR first groove 35 and is low at the portion of the EGR second groove 36.

  The left and right EGR first grooves 35 are branched from the end of the EGR gas inlet hole 18, and the left and right EGR second grooves 36 are described above from the ends of the left and right EGR first grooves 35. Therefore, the EGR gas distribution passage 16 also has the first branch portion 41 and the second branch portion 42, and the EGR gas distribution passage 16 has a tournament shape as a whole.

  As shown in FIG. 9A, the EGR first groove 35 is slightly lower than the end of the EGR gas inlet hole 18. Therefore, the auxiliary recess 43 is formed in the lower member 4 at the first branch portion 41. Further, the left and right EGR first grooves 35 are L-shaped in which the end portions thereof are narrow joint portions 35 a, and the joint portions 35 a communicate with the left and right intermediate portions of the EGR second grooves 36.

  In the present embodiment, the EGR first groove 35 is wider than the EGR gas distribution passage 16. Therefore, the EGR first groove 35 functions as a buffer unit for storing the EGR gas. The EGR gas is supplied by positive pressure and may have pulsations, so if the flow directionality remains, a large amount of EGR gas flows into one of the left and right EGR second grooves 36 However, if the first EGR groove 35 is formed to have a large volume (configured in the chamber) as in the present embodiment and the buffer function is provided, the directionality of the flow of the EGR gas disappears, The EGR gas can flow uniformly to the left and right EGR second grooves 36. The auxiliary recess 43 also has a function of eliminating the directionality of the EGR gas.

  As shown in FIGS. 3 and 7, the outlet holes 38 of the EGR gas distribution passage 16 are located at the left and right intermediate portions of the intake branch pipes 6a to 6d. The EGR gas distribution passage 16 is inclined downward as a whole, and the outlet hole 38 is inclined downward. Therefore, even if condensed water is generated in the EGR gas distribution passage 16, it does not accumulate, and it is possible to prevent a trouble due to freezing.

  Although the embodiments of the present invention have been described above, the present invention can be embodied in various ways. For example, the intake manifold does not necessarily have a form having a lower horizontal portion, such as a type in which the intake branch pipe extends upward from the surge tank, or a type in which the intake branch pipe is curved to surround the surge tank. Is also applicable.

  It is also possible to replace the PCV gas distribution passage of the embodiment with the EGR gas distribution passage. Alternatively, it is also possible to form the PCV gas distribution passage and the EGR gas distribution passage only on the front surface or the back surface of the intake manifold.

  Although the embodiment is applied to the intake manifold of a four-cylinder internal combustion engine, the present invention is also applicable to an internal combustion engine having two or three cylinders, an internal combustion engine having six or more cylinders, or the like.

  The present invention can be embodied in an intake manifold of an internal combustion engine. Therefore, it can be used industrially.

Reference Signs List 1 cylinder head 1a intake side 2 intake manifold 3 upper member 4 lower member 5 surge tank 6a to 6d intake branch pipe 7 lower horizontal portion in the group of intake branch pipe 8 bent portion in the group of intake branch pipe 10 intake Base 15 PCV gas distribution passage 16 EGR gas distribution passage 17 Gas introduction base 18 EGR gas inlet hole 19 PCV gas inlet 20 bracket part 21 rib 24 1st groove which constitutes PCV gas distribution passage (chamber chamber)
25 and 26 Grooves constituting the PCV gas distribution passage 27 Upper lid member 28 Exit hole of the PCV gas distribution passage 29, 30 Branching portion of the PCV gas distribution passage 35 and 36 Grooves constituting the EGR gas distribution passage 37 Lower lid member 38 EGR Exit hole of gas distribution passage

Claims (3)

A group of intake manifolds aligned in the direction of the crankshaft is provided, and adjacent intake manifolds are connected with each other, so that the group of intake manifolds is aligned with the longitudinal direction of the intake manifold and A front surface portion and a back surface portion that
A gas introduction pedestal in which an inlet of an EGR gas distribution passage and an inlet of a PCV gas distribution passage are formed integrally with one of the front surface portion and the back surface portion in the group of the intake branch is formed
Intake manifold. The gas introduction base has a front surface facing in a direction intersecting the arranging direction of the intake branch pipes, and left and right side surfaces facing in the arranging direction of the intake branch pipes.
The PCV gas distribution passage is provided with an inlet hole opened in front of the gas introduction pedestal,
The inlet of the PCV gas distribution passage is formed on either one of the left and right side surfaces of the gas introduction pedestal and opens in the direction in which the intake manifolds are arranged, and the PCV gas of the gas introduction pedestal is opened. On the side where the inlet of the distribution passage is provided, a chamber chamber which becomes the beginning of the PCV gas distribution passage is formed to be laterally separated from the inlet hole of the EGR gas distribution passage.
The intake manifold according to claim 1. The gas introduction base has a front surface facing in a direction intersecting the arranging direction of the intake branch pipes, and left and right side surfaces facing in the arranging direction of the intake branch pipes.
The PCV gas distribution passage is provided with an inlet hole opened in front of the gas introduction pedestal,
The PCV gas distribution passage has a horizontally long branched passage in a posture crossing the inlet hole of the EGR gas distribution passage, and the horizontally long branched passage is closed by a lid member with a long groove formed in the group of the intake branch pipes. The transversely distributed passage of the PCV gas distribution passage and the inlet hole of the EGR gas distribution passage are made to intersect with each other in a mutually separated manner,
The intake manifold according to claim 1 or 2.

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