JP2005133548A - Air inlet port structure of cylinder head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the arrangement of a fuel injection valve closely to an air inlet port, to enable the reduction of the spray space in volume so as to reduce the inflow resistance of an air inlet into a branch passage. <P>SOLUTION: In an air inlet port structure of a cylinder head, an air intake introducing port of a common passage opened to the external surface of the cylinder head is formed in an elliptical shape which is greater in the width direction compared with the vertical direction, a downward intake port side swelling section is formed at the middle ceiling surface of the common passage from the intake introducing port over the spray space from the inlet introducing port, and an inlet port side recessed groove is formed in the injection valve storing section formed above the common passage corresponding to the intake port side swelling section. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an intake port structure of a cylinder head, and in particular, a fuel injection valve can be disposed close to the intake port, and the volume of the spray space of the spray portion can be reduced. The present invention relates to an intake port structure of a cylinder head that can reduce the inflow resistance of intake air to a branch passage.

  In an internal combustion engine mounted on a vehicle or the like, an intake port that guides intake air to a combustion chamber of a cylinder head is provided. As the intake port structure of the cylinder head, there are those shown in FIGS. In FIG. 7, 102 is an internal combustion engine, 104 is a cylinder block, 106 is a cylinder head, 108 is a cylinder head cover, 110 is a cylinder, 112 is a piston, 114 is a recess, and 116 is a combustion chamber. The cylinder head 106 of the internal combustion engine 102 is provided with an intake port 118 that guides intake air to the combustion chamber 116, and an exhaust port 120 that guides exhaust gas from the combustion chamber 116 to the outside.

  As shown in FIG. 8, the intake port 118 includes one intake inlet 122 that opens on the outer surface on one side in the width direction of the cylinder head 106, two intake valve openings 124 that open to the combustion chamber 116, and an intake inlet. One common passage 126 starting from 122, two branch passages 128 starting from the intake valve port 124, and a partition wall 130 that branches the common passage 126 into two branch passages 128 are provided. The cylinder head 106 is provided with an intake valve 132 that opens and closes the intake valve port 124. Further, the cylinder head 106 is provided with an exhaust valve 136 for opening and closing the exhaust valve port 134 of the exhaust port 118.

  In the cylinder head 106, an injection valve accommodating portion 138 is formed above the common passage 126 of the intake port 118, and a fuel injection valve 140 that injects fuel toward the intake valve port 124 is disposed. The fuel injection valve 140 is provided with a nozzle 144 on the distal end side of the main body 142, a connection portion 146 on the proximal end side, and a harness connector 148 on the main body 142.

  The fuel injection valve 140 has a spray portion 156 formed on the upper wall 152 of the common passage 126 such that the tip of the nozzle 144 faces a spray space 154 formed by recessing upward on the inner surface side of the upper wall 152 of the common passage 126. It is attached to. Further, the fuel injection valve 140 connects the connecting portion 146 to the delivery pipe 158.

  In the cylinder head 106, a port side mounting flange 160 is formed around the intake inlet 122 on the outer surface on one side in the width direction, and an intake manifold 162 is attached. The intake manifold 162 is provided with a branch pipe 166 having one end connected to the surge tank 164, and a manifold-side mounting flange 168 provided on the other end of the branch pipe 166. The intake manifold 162 has a manifold side mounting flange 168 attached to the port side mounting flange 160, and communicates a manifold side intake passage (not shown) to the common passage 126.

In the conventional cylinder head intake port structure, a recess for fuel injection is formed in the upper wall of the intake port, and the nozzle of the fuel injection valve is placed in this recess and attached to the boss on the upper wall. There is.
In the conventional intake port structure of the cylinder head, there is one in which a recess through which fuel spray passes is formed in the upper portion of the wall surface of the intake port, and the nozzle of the fuel injection valve faces this recess.
A conventional cylinder head intake port structure has first and second intake ports branched from the intake port opening of a cylinder head having first and second intake valves per cylinder, There is a type in which a partition is formed between the intake port opening and a narrow passage and a wide passage, a swirl control valve is provided in the wide passage, and a fuel injection valve is provided in the narrow passage.
In the conventional cylinder head intake port structure, a series of intake ports are formed by connecting an oblong opening including two circular intake ports in the air intake direction, and the inner surface of the intake port downstream from the intake valve shaft is projected. Some of them have a rectifying wall that divides the intake port into two circular intake ports.
The conventional intake port structure of a cylinder head is provided with an intake port that branches from one intake introduction port that opens to the outer surface of the cylinder head to two intake valve ports that open to the combustion chamber. It gradually changes to an oval cross section toward the branch portion, and is separated into two half-oval circular branch ports by a central partition at the branch portion, and the branch port gradually moves toward the intake valve port. Some are designed to change to a circular cross-section.
JP 2001-140715 A JP-A-9-2222063 Japanese Utility Model Publication No.4-1668 Japanese Utility Model Publication No. 3-92527 Japanese Utility Model Publication No. 62-61957

  By the way, in order to clean the exhaust gas of the internal combustion engine, it is desirable to arrange the fuel injection valve as close to the combustion chamber as possible and to prevent the sprayed fuel from adhering to the wall surface of the intake port as much as possible.

  However, in the structure of the intake port 118 of the cylinder head 106 shown in FIGS. 7 and 8, the harness connector 148 of the fuel injection valve 140 attached to the spray portion 156 interferes with the cylinder head cover 108. Cannot be disposed close to the combustion chamber 116, and the exhaust of the internal combustion engine 102 cannot be sufficiently cleaned.

  Further, the structure of the intake port 118 of the cylinder head 106 shown in FIGS. 7 and 8 is such that the spray port (not shown) of the nozzle 144 of the fuel injection valve 140 attached to the spray unit 156 and the wall surface of the intake port 118. Since it is separated, there is a problem that the volume of the spray space 154 into which the fuel is injected becomes large.

  Therefore, in the structure of the intake port 118 of the cylinder head 106 shown in FIGS. 7 and 8, a large intake passage is formed by the intake port 118 and the large-volume spray space 154, and the intake passage cross-sectional area changes suddenly. As a result, the flow rate of the intake air decreases, leading to a decrease in filling efficiency, and the output cannot be improved.

  According to the present invention, an intake port that guides intake air to a combustion chamber of an internal combustion engine is provided in a cylinder head, the intake port has one intake inlet opening that opens to the outer surface of the cylinder head, and two intake valves that open to the combustion chamber An intake valve opening, a common passage starting from the intake inlet, two branch passages starting from the intake valve opening, and a partition branching the common passage into the branch passage, A fuel injection valve for injecting fuel toward the fuel is disposed in an injection valve housing portion formed above the common passage, and a tip of the nozzle of the fuel injection valve is formed on the inner surface side of the upper wall of the common passage. In the intake port structure of the cylinder head facing the space, the intake inlet of the common passage is formed in one elliptical shape having a width direction larger than that in the vertical direction, and extends from the intake inlet to the spray space. Both To form a downward intake port side bulging portion in the center ceiling surface of the passage, and wherein said that in response to the intake port side bulging portion forms an intake port side groove on the injection-valve housing.

In the intake port structure of the cylinder head according to the present invention, the intake inlet of the common passage of the intake port is formed in one elliptical shape whose width direction is larger than the vertical direction, and the common passage of the common passage extends from the intake inlet to the spray space. The intake port side bulge is formed on the central ceiling surface and the intake port side bulge is formed in the injection valve housing portion corresponding to the intake port side bulge. The injection valve can be disposed close to the intake port to reduce the volume of the spray space, and the flow of the intake air in the common passage can be directed outward by the intake port side bulge.
For this reason, in the intake port structure of this cylinder head, the fuel injection valve can be disposed close to the intake port, so that the fuel injection valve can be disposed as close to the combustion chamber as possible, and the spraying can be performed. Since the fuel is not attached to the wall of the intake port as much as possible, the exhaust of the internal combustion engine can be cleaned, and the volume of the spray space can be reduced, thereby preventing a reduction in the flow rate of the intake air. Therefore, the reduction in charging efficiency can be avoided, so that the output can be improved and the flow of the intake air in the common passage can be directed outward, so that the common passage can be directed to the two branch passages. Since the inflow resistance of the intake air can be reduced, a decrease in the flow rate of the intake air flowing into the combustion chamber can be prevented and a strong swirl can be formed.

In the intake port structure of the cylinder head according to the present invention, the intake inlet of the intake port is formed into one elliptical shape having a large width direction, and a downwardly directed intake port side bulge is formed on the central ceiling surface of the common passage. , By forming the intake port side concave groove corresponding to the intake port side bulging portion in the injection valve housing portion, the fuel injection valve is arranged close to the intake port, reducing the volume of the spray space, The flow of the intake air in the passage is directed outward.
Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 6 show an embodiment of the present invention. 5 and 6, 2 is an internal combustion engine, 4 is a cylinder block, 6 is a cylinder head, and 8 is a cylinder head cover. In the internal combustion engine 2, as shown in FIGS. 3 and 4, a combustion chamber 16 is formed by the cylinder 10 of the cylinder block 4, the piston 12, and the recess 14 of the cylinder head 6. The cylinder head 6 of the internal combustion engine 2 is provided with an intake port 18 that guides intake air to the combustion chamber 16 and an exhaust port (not shown) that guides exhaust gas from the combustion chamber 16 to the outside.

  As shown in FIG. 3, the intake port 18 has one intake inlet 20 opening on the outer surface on one side in the width direction of the cylinder head 6, two intake valve openings 22 opening in the combustion chamber 16, and an intake inlet. One common passage 24 starting from 20, two branch passages 26 starting from the intake valve port 22, and a partition wall 28 that branches the common passage 24 into two branch passages 26 are provided. The cylinder head 6 is provided with an intake valve 30 that opens and closes the intake valve port 22.

  As shown in FIG. 4, the cylinder head 6 has an injection valve housing portion 32 formed above the common passage 24, and a fuel injection valve 34 that injects fuel toward the intake valve port 22 is disposed. The fuel injection valve 34 is provided with a nozzle 38 on the distal end side of the main body portion 36, a connection portion 40 on the proximal end side, and a harness connector 42 on the outer side (intake manifold 64 side) of the main body portion 36. The fuel injection valve 34 faces a spray space 46 formed by recessing the tip of the nozzle 38 upward on the inner surface side of the upper wall 44 of the common passage 24, and a spray portion 48 formed on the upper wall 44 of the common passage 24. The nozzle 38 is mounted in the mounting hole 50. Further, the fuel injection valve 34 connects the connecting portion 40 to the delivery pipe 52.

  The structure of the intake port 18 of the cylinder head 6 is, as shown in FIG. 1, one elliptical shape in which the intake direction 20 of the common passage 24 of the intake port 18 is larger in the width direction than the vertical direction. The intake port side bulged portion 54 is formed on the central ceiling surface of the common passage 24 from the intake inlet 20 to the spray space 46, and the injection valve housing portion 32 corresponds to the intake port side bulged portion 54. Thus, the intake port side concave groove 56 is formed.

  As a result, the structure of the intake port 18 can lower the position of the fuel injection valve 34 by the intake port-side recessed groove 56, whereby the fuel injection valve 34 is moved to the port axis P of the intake port 18 and the intake valve port 22. By disposing them close to each other, the volume of the spray space 46 can be reduced, and the flow of the intake air in the common passage 24 can be directed outward by the intake port side bulging portion 54.

  For this reason, since the structure of the intake port 18 can be disposed with the fuel injection valve 34 close to the intake port 18, the fuel injection valve 34 can be disposed as close to the combustion chamber 16 as possible. Moreover, since the sprayed fuel is not attached to the wall surface of the intake port 18 as much as possible, the exhaust of the internal combustion engine 2 can be cleaned.

  In addition, since the structure of the intake port 18 can reduce the volume of the spray space 46, the cross-sectional area of the intake passage does not change suddenly, and the flow rate of the intake air is prevented from decreasing to avoid a decrease in charging efficiency. Therefore, the output can be improved.

  Furthermore, since the structure of the intake port 18 can direct the flow of intake air in the common passage 24 to the outside, the inflow resistance of intake air from the common passage 24 to the two branch passages 26 can be reduced. Therefore, it is possible to prevent a decrease in the flow velocity of the intake air flowing into the combustion chamber 16 and form a strong swirl.

  As shown in FIG. 2, the intake port 18 is formed with substantially the same width from the intake introduction port 20 to the intake valve port 22 in a top view.

  For this reason, since the structure of the intake port 18 is formed with substantially the same width from the common passage 24 to the branch passage 26, intake air intake from the intake inlet 20 of the common passage 24 to the intake valve port 22 of the branch passage 26 is made. Inflow resistance can be reduced.

  Further, as shown in FIG. 4, the intake port 18 is formed so that the port axis P protrudes upward and is curved in a side view.

  Therefore, the structure of the intake port 18 allows the intake port 18 and the fuel injection valve 34 to be disposed closer to each other, and further reduces the volume of the spray space 46. The angle θ between the valve axis B and the port axis P of the intake port 18 can be reduced, and the inflow resistance of intake air to the intake valve port 22 can be reduced.

  Further, the intake port 18 is formed so that the curvature of the port axis P is maximized in the vicinity of the spray space 46.

  For this reason, the structure of the intake port 18 maximizes the curvature of the port axis P in the vicinity of the spray space 46. Therefore, the intake port 18 and the nozzle 38 of the fuel injection valve 34 can be brought close to each other. The volume of can be reduced.

  In the fuel injection valve 34, a harness connector 42 is disposed on the lower side surface of the main body 36 attached to the cylinder head 6, and the connector insertion port 58 of the harness connector 42 is disposed on one side in the width direction of the cylinder head 6. It opens toward the outer side spaced apart from the outer surface.

  For this reason, the structure of the intake port 18 prevents the harness connector 42 and the cylinder head cover 8 from interfering with each other when the fuel injection valve 34 is attached. The volume of the spray space 46 can be reduced. As shown in FIG. 5, the fuel injection valve 34 is sandwiched on both sides of the harness connector 42 by the rotating presser 60 attached to the delivery pipe 52 and is prevented from rotating.

  A port-side mounting flange 62 is formed around the intake inlet 20 on the outer surface on one side in the width direction of the cylinder head 6. As shown in FIGS. 5 and 6, the intake manifold 64 for introducing intake air to the intake port 18 is provided with a branch pipe 68 connected at one end to the surge tank 66, and a manifold side mounting flange at the other end of the branch pipe 68. 70 is provided. A throttle body 72 is connected to the surge tank 66. The branch pipe 68 is provided with a manifold-side intake passage 74. The two outer branch pipes 68 extending from the manifold-side mounting flange 70 linearly extend downward and then curve to the center side to communicate with the surge tank 66. The two center branch pipes 68 face outward. After extending and extending downward along the outer branch pipe 68, it curves to the center side and communicates with the surge tank 66. A surge tank 66 and a throttle body 72 are disposed in a portion surrounded by the branch pipe 68, and a connection port 72a of the throttle body 72 is opened upward.

  As shown in FIGS. 3 and 4, a tumble control valve body 76 is disposed between the port side mounting flange 62 of the intake port 18 and the manifold side mounting flange 70 of the intake manifold 64. The tumble control valve body 76 is provided with a body side intake passage 78 that connects the manifold passage 74 and the common passage 24, and a tumble control butterfly valve 80 is pivotally supported by a valve shaft 82. The tumble control valve body 76 and the manifold side mounting flange 70 are provided with a body side concave groove 84 and a manifold side concave groove 86 that are continuous with the intake port side concave groove 56.

  For this reason, the structure of the intake port 18 allows the harness connector 42 and the harness coupler (not shown) to be easily attached and detached without the tumble control valve body 76 and the manifold-side mounting flange 70 getting in the way. Therefore, the assembling property of the harness connector 42 of the fuel injection valve 34 can be improved.

  As shown in FIG. 1, the tumble control valve body 76 is provided with the body-side intake passage 78 that is continuous with the common passage 24, and the body-side intake passage 78 has a larger width direction than the vertical direction. The butterfly valve 80 is formed with a body-side bulging portion 88 facing downward in the central ceiling surface of the body-side intake passage 78, and the body-side intake passage 78 is cut away from the upper side. It is arranged.

  For this reason, the structure of the intake port 18 can divide the flow of intake air in the upper part of the common passage 24 into two by the butterfly valve 80 and the body side bulging portion 88 that are cut out on the upper side. It is possible to smoothly flow into the two branch passages 26. Further, the structure of the intake port 18 cuts out the upper side of the butterfly valve 80, so that a tumble flow can be generated. The shape of the lower peripheral surface of the semi-elliptical butterfly valve 80 and the lower side of the common passage 24 are provided. The shape of the inner wall can be easily matched and a simple configuration can be obtained.

  As a result, the structure of the intake port 18 of the cylinder head 6 can achieve both exhaust gas cleaning performance, engine output performance, improved component assembly, and improved fuel efficiency.

  The intake port structure of the cylinder head according to the present invention has a fuel injection valve disposed close to the intake port, reduces the volume of the spray space, and directs the flow of intake air in the common passage to the outside. It can be applied to an intake system of an internal combustion engine.

It is a perspective view of an intake port showing an embodiment of the present invention. It is a top view of an intake port. It is sectional drawing in the valve axis line of the intake valve of a cylinder head. It is sectional drawing in the port axis line of the intake port of a cylinder head. It is a perspective view of an internal combustion engine. It is a top view of an internal combustion engine. It is sectional drawing of the internal combustion engine which shows a prior art example. It is sectional drawing of a cylinder head.

Explanation of symbols

2 Internal combustion engine 4 Cylinder block 6 Cylinder head 8 Cylinder head cover 16 Combustion chamber 18 Intake port 20 Intake inlet port 22 Intake valve port 24 Common passage 26 Branch passage 28 Bulkhead 30 Intake valve 32 Injection valve housing portion 34 Fuel injection valve 36 Main body portion 38 Nozzle 42 Harness connector 44 Upper wall 46 Spraying space 48 Spraying part 54 Inlet port side bulging part 56 Inlet port side recessed groove 62 Port side mounting flange 64 Intake manifold 70 Manifold side mounting flange 76 Tumble control valve body 80 Butterfly valve 84 Body Side groove 86 Manifold side groove 88 Body side bulge

Claims (7)

  An intake port that guides intake air to a combustion chamber of an internal combustion engine is provided in the cylinder head, the intake port has one intake inlet port that opens to an outer surface of the cylinder head, two intake valve ports that open to the combustion chamber, One common passage starting from the intake inlet, two branch passages starting from the intake valve opening, and a partition wall that branches the common passage into the branch passage are provided, and fuel is directed toward the intake valve opening. The fuel injection valve for injecting fuel is disposed in the injection valve housing portion formed above the common passage, and the tip of the nozzle of the fuel injection valve faces the spray space formed on the inner surface side of the upper wall of the common passage. In the intake port structure of the cylinder head, an intake inlet of the common passage is formed in one elliptical shape having a width direction larger than the vertical direction, and the center of the common passage extends from the intake inlet to the spray space. An intake port side bulging portion facing downward is formed on the well surface, and an intake port side recessed groove is formed in the injection valve housing portion corresponding to the intake port side bulging portion. Port structure.   2. The intake port structure of a cylinder head according to claim 1, wherein the intake ports are formed with substantially the same width in a top view from an intake inlet to an intake valve port.   2. The intake port structure for a cylinder head according to claim 1, wherein the intake port is formed so that a port axis is curved upward in a side view.   4. The intake port structure for a cylinder head according to claim 3, wherein the intake port is formed so that the curvature of the port axis is maximized in the vicinity of the spray space.   2. The cylinder according to claim 1, wherein the fuel injection valve has a harness connector disposed on a lower side surface of the main body, and a connector insertion port of the harness connector is opened outward. 3. Intake port structure of the head.   A tumble control valve body is disposed between the port side mounting flange of the intake port and the manifold side mounting flange of the intake manifold, and the intake port side recessed groove is formed in the tumble control valve body and the manifold side mounting flange. 2. The intake port structure for a cylinder head according to claim 1, wherein a continuous body-side groove and a manifold-side groove are provided.   The tumble control valve body is provided with a body-side intake passage that is continuous with the common passage, and the body-side intake passage is formed in one elliptical shape having a width direction larger than the vertical direction, and the body-side intake passage 2. The cylinder head intake port according to claim 1, wherein a downwardly facing body-side bulging portion is formed on a central ceiling surface of the cylinder, and a butterfly valve notched on the upper side is disposed in the body-side intake passage. Construction.

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