JP2019078260A - Intake system of internal combustion engine and air flow control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device of an internal combustion engine capable of suppressing a decrease in tumble by suppressing formation of a large gap between a partition part and an intake flow control valve. SOLUTION: This intake manifold 6 is provided with an intake passage 7 for supplying intake air to a combustion chamber 5 of an engine body 10, a partition portion 64 provided in the intake passage 7 and dividing the intake passage 7, and a rotary shaft 81. Is disposed upstream of the end 64a on the upstream side of the partition 64, and is rotatably provided in the closing direction that closes the intake passage 7 and the opening direction that opens the intake passage 7 around the axis of the rotation shaft 81. And TCV8. In the TCV 8, the back surface 83b facing the upstream end 64a of the partition portion 64 when rotated in the closing direction has the back surface 83b on the upstream side of the partition portion 64 in a cross section in a direction orthogonal to the axial direction of the rotating shaft 81. It includes a valve body 82 formed in a convex arc shape toward the end 64a. [Selection diagram] Figure 2

Description

  The present invention relates to an intake system and an air flow control device for an internal combustion engine, and more particularly to an intake system and an air flow control device for an internal combustion engine including an intake flow control valve provided rotatably.

  BACKGROUND ART Conventionally, an intake system and an air flow control device of an internal combustion engine provided with an intake flow control valve provided rotatably are known (see, for example, Patent Document 1).

  In Patent Document 1 mentioned above, a guide inserted into a cylinder head of an engine (internal combustion engine main body) and a partition (divider dividing the intake port in the guide into a lower first flow passage and an upper second flow passage An intake manifold is disclosed which comprises: a) and a rotatable flat intake control valve (intake flow control valve). In this intake manifold, the upstream end of the partition wall and the intake control valve are close to each other by the intake control valve being rotated in the closing direction from the fully open state in which intake can flow through the first and second channels. It is configured to switch to the half open state where the lower first flow path is closed. Further, the intake manifold is switched to a small open state in which the lower first flow path is closed and the upper second flow path is narrowed by further rotating the intake control valve in the closing direction from the half open state Is configured as.

  Thereby, in the half open state and the small open state, the amount of intake air passing through the upper second flow passage is larger than the amount of intake air passing through the lower first flow passage, and the intake air passing through the upper second flow passage The flow velocity of the air flow is higher than the flow velocity of the intake air passing through the lower first flow passage. As a result, a tumble (a longitudinal vortex formed in the combustion chamber and around the axis of the crankshaft connected to the engine) is generated.

JP, 2007-113482, A

  However, in the intake manifold described in Patent Document 1, when the partition and the intake control valve are separated by the rotation of the flat intake control valve in the small open state, the partition and the intake control valve are separated. It is believed that a large gap is formed between the upper second flow passage and the lower first flow passage. Therefore, the amount of intake air in the upper second flow passage decreases and the flow velocity of intake air decreases due to the intake air flowing into the first flow passage through the large gap. Therefore, there is a problem that the tumble is reduced.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to suppress formation of a large gap between the partition portion and the intake flow control valve. It is an object of the present invention to provide an intake system and an air flow control device of an internal combustion engine capable of suppressing a decrease in tumble.

  In order to achieve the above object, an intake system of an internal combustion engine according to a first aspect of the present invention is provided in an intake passage which communicates with a combustion chamber of the internal combustion engine main body and supplies intake air to the combustion chamber , A partition part that divides the intake passage, and a pivot shaft, which is disposed upstream of the upstream end of the partition part, and which closes the intake passage around the axis of the pivot shaft and opens the intake passage. An intake flow control valve provided rotatably in a direction, and the intake flow control valve has an opposing surface, which is opposed to the upstream end of the partition when being rotated in the closing direction, It includes a valve body formed in a convex arc shape toward the upstream end of the partition in a cross section in a direction orthogonal to the axial direction of the shaft.

  In the intake system of the internal combustion engine according to the first aspect of the present invention, as described above, the opposing surface of the valve body is formed in a convex arc shape toward the end, so that the valve body is flat ( Unlike the case where the opposing surface is flat, the valve body is rotated from the state of facing the upstream end of the partition and the opposing surface, and directly faces the upstream end of the partition. Even when the position of the facing surface changes, it is possible to suppress an increase in the distance between the upstream end of the partition and the facing surface. Thus, it is possible to suppress the formation of a large gap between the upstream end of the partition and the opposed surface of the intake flow control valve. Therefore, the valve of the intake passage partitioned by the partition may be a valve. It is possible to prevent the intake air from flowing into the intake passage portion on the side blocked by the body. As a result, it is possible to suppress a decrease in the amount of intake air flowing through the intake passage portion not blocked by the valve body, and to suppress a decrease in the flow velocity of the intake, so a tumble is generated. It is possible to suppress the decrease. Therefore, the combustion speed can be improved in the internal combustion engine, and the thermal efficiency of the internal combustion engine can be improved, whereby the fuel efficiency of the internal combustion engine can be improved.

  In the intake system of the internal combustion engine according to the first aspect, preferably, the valve body is configured to turn around the axis line in a state where the opposing surface and the upstream end of the partition part are separated by a minute gap. ing.

  According to this structure, it is possible to reliably suppress the intake air from flowing into the intake passage portion on the side closed by the valve body among the intake passages partitioned by the partition portion. This makes it possible to reliably suppress the decrease in tumble.

  In this case, preferably, the valve body further includes a valve body main body provided with the opposing surface, and a connection portion disposed at an end in the axial direction and connecting the valve body main body and the pivot shaft, and an intake passage The connector housing is further provided with a connector housing which is provided in a concave shape on the inner surface of the housing and in which the connector of the valve is housed. It is formed in a fan shape having an arc portion corresponding to the arc shape, and the arc portion of the connection portion accommodating portion corresponding to the upstream end of the partition portion is flush with the upstream end portion of the partition portion. It is.

  According to this structure, separation of the arc portion of the connection portion accommodation portion in which the connection portion of the valve body is accommodated and the upstream end portion of the partition portion can be suppressed. The upstream end of the partition portion and the opposing surface of the valve body can be easily configured to be separated by a minute gap. In addition, since the connection portion accommodation portion can suppress the connection portion of the valve body from being located in the intake passage, the connection portion becomes a resistance when the intake flows (flow resistance of the intake). It can be suppressed.

  In the intake system of the internal combustion engine according to the first aspect, preferably, the partition divides the intake passage into the upper intake passage and the lower intake passage, and the valve body includes the entire lower intake passage. It is configured to be rotatable so as to cover a part of the upper intake passage.

  According to this structure, the inflow of intake air into the lower intake passage can be suppressed by the valve body in which the opposing surface is formed in a convex arc shape, so the amount of intake air flowing through the upper intake passage is reduced. Can be suppressed, and it can be suppressed that the flow velocity of intake air becomes small. Furthermore, the valve covers a part of the upper intake passage, whereby the flow velocity of the intake air flowing through the upper intake passage can be effectively increased. As a result of these, the tumble can be effectively increased.

  In the intake system of the internal combustion engine according to the first aspect, preferably, an intake manifold including an upstream passage that constitutes an upstream intake passage, an intake flow control valve, and a casing in which the intake flow control valve is disposed. And an air flow control device disposed on the internal combustion engine main body side of the intake manifold, and in the casing, a pipe portion forming the downstream side passage that constitutes the downstream intake passage, the partition portion, and the intake air. A valve accommodating portion in which at least a part of the flow control valve is disposed, and a supporting portion rotatably supporting a pivot shaft of the intake flow control valve in the valve accommodating portion are integrally provided.

  According to this structure, the valve body of the intake flow control valve is supported by the support portion integrally provided with the partition portion and partially disposed in the valve housing portion integrally provided with the partition portion; The clearance (clearance) with the partition can be easily adjusted to be small. In this way, it is possible to reliably suppress the intake air from flowing into the intake passage portion on the side closed by the valve body among the downstream side passages partitioned by the partition portion, so that the valve body of the downstream side passage It is possible to reliably suppress a decrease in the amount of intake air flowing through the unobstructed intake passage portion. Also, by providing the air flow control device (casing) separately from the intake manifold, the air flow control device can be removed separately from the intake manifold, so that the intake flow control valve supported on the support of the casing can be replaced. Workability can be improved.

  The air flow control device according to the second aspect of the present invention is an air flow control device attached to an internal combustion engine main body, and is provided in an intake air passage for supplying intake air to a combustion chamber of the internal combustion engine main body. Part, including a pivot, located upstream of the upstream end of the partition, and capable of pivoting in a closing direction for closing the intake passage and an opening for opening the intake passage about an axis along which the pivot extends The intake flow control valve is provided, and the intake flow control valve is such that an opposing surface facing the upstream end of the partition when the rotational control valve is turned in the closing direction is orthogonal to the axial direction of the rotational shaft The valve body formed in convex circular arc shape toward the upstream edge part of a partition part in the cross section of the direction.

  In the air flow control device according to the second aspect of the present invention, as in the first aspect, the opposing surface of the valve body is formed in a convex arc shape toward the end, so that the upstream side of the partition portion Since it is possible to suppress the formation of a large gap between the end portion and the facing surface, it is possible to suppress the decrease in tumble in the device provided with the air flow control device.

  In the air intake system for an internal combustion engine according to the first aspect, the following configuration is also conceivable in the present application.

(Appendix 1)
That is, in the configuration in which the valve body includes the valve body, the downstream end of the valve body is formed in a round shape.

(Appendix 2)
The intake system for an internal combustion engine according to the first aspect includes a passage portion which constitutes a part of an intake passage and in which a partition portion is disposed inside, and further includes an insertion portion inserted into an intake port of an internal combustion engine body. The insertion portion is made of a resin material that is more heat insulating than the internal combustion engine main body.

(Appendix 3)
The intake system for an internal combustion engine according to the first aspect includes a passage portion which constitutes a part of an intake passage and in which a partition portion is disposed inside, and further includes an insertion portion inserted into an intake port of an internal combustion engine body. The insertion portion is inserted into the intake port with an air gap between the outer circumferential surface of the insertion portion and the inner circumferential surface of the intake port.

(Appendix 4)
In the configuration including the connection portion accommodation portion, the valve body main body accommodation portion further includes a valve body main body accommodation portion provided concavely on the inner surface of the intake passage and accommodated so that the valve body main body is not exposed to the intake passage. The arc section corresponding to the convex arc shape of the opposing surface of the valve body in the cross section orthogonal to the axial direction includes an arc section, and the arc section of the valve body accommodation section and the arc section of the connection section accommodation section are connected It is formed to be.

(Appendix 5)
The intake system for an internal combustion engine according to the first aspect further includes an air flow control device provided with a partition and an intake flow control valve and attached to the internal combustion engine body, the air flow control device being attached to the internal combustion engine body And includes the flange portion in contact with the outer surface of the internal combustion engine body, and the upstream end of the partition portion is located at the same position as the flange portion in the intake direction or downstream of the flange portion .

(Appendix 6)
In the intake system of the internal combustion engine according to the first aspect, the upstream end of the partition is located near the upstream end of the intake port of the internal combustion engine main body.

(Appendix 7)
The intake system for an internal combustion engine according to the first aspect further includes an intake manifold that constitutes an intake passage and is provided with a partition and an intake flow control valve.

(Appendix 8)
In the configuration in which the downstream side passage, the partition portion, the valve housing portion, and the support portion are integrally provided, the intake manifold is provided so as to cover at least a part of the casing and abuts on the internal combustion engine main body The fuel cell further includes a seal member disposed so as to be sandwiched between the contact portion between the intake manifold and the internal combustion engine main body and the contact portion between the casing and the internal combustion engine main body.

(Appendix 9)
In this case, the casing further includes a collar portion sandwiched between the internal combustion engine body and the intake manifold, and the intake manifold is configured to press the collar portion and the seal member toward the internal combustion engine main body.

(Appendix 10)
In the configuration in which the downstream side passage, the partition portion, the valve housing portion, and the support portion are integrally provided, the valve body further includes a valve body main body provided with an opposing surface, and is provided concavely on the inner surface of the intake passage. The apparatus further comprises a valve body main body accommodating portion for accommodating the valve body main body so as not to be exposed to the intake passage, the upstream side of the valve body main body accommodating portion is provided in the intake manifold, and the downstream side of the valve body main body accommodating portion It is provided.

(Appendix 11)
In the configuration in which the downstream side passage, the partition portion, the valve housing portion, and the support portion are integrally provided, the casing is made of resin.

1 is a perspective view schematically showing an entire configuration of an engine provided with an intake system according to a first embodiment of the present invention. FIG. 5 is a cross-sectional view along the intake direction showing the open state of the intake manifold according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line 500-500 of FIG. 2; FIG. 2 is a perspective view showing a TCV of an intake manifold according to a first embodiment of the present invention. FIG. 3 is an enlarged sectional view around an intake manifold of FIG. 2; FIG. 6 is a cross-sectional view showing a state in which the valve body is removed in the cross section along line 510-510 in FIG. 5; It is sectional drawing along the 510-510 line of FIG. FIG. 4 is a cross-sectional view along an intake direction showing an example of a closed state of an intake manifold according to the first embodiment of the present invention. FIG. 9 is an enlarged sectional view around an intake manifold of FIG. 8; It is sectional drawing along the 520-520 line of FIG. FIG. 7 is a cross-sectional view along the intake direction showing another example of the closed state of the intake manifold according to the first embodiment of the present invention. It is an expanded sectional view of the intake manifold periphery of FIG. It is sectional drawing along the 530-530 line of FIG. FIG. 7 is an exploded perspective view showing an intake manifold and a TCV assembly of an intake system according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view along the intake direction showing a TCV assembly according to a second embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view along the intake direction showing the TCV assembly according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view showing an intake system according to a first modification of the first embodiment of the present invention. It is an expanded sectional view showing the intake manifold by the 2nd modification of a 1st embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

First Embodiment
The configuration of an engine 1 (an example of an internal combustion engine) to which an intake system 100 for an internal combustion engine (hereinafter referred to as the intake system 100) according to a first embodiment of the present invention is attached will be described with reference to FIGS. .

(Schematic configuration of engine)
As shown in FIG. 1, an engine 1 (an example of an internal combustion engine) for a vehicle (automobile) is suctioned by reciprocation of pistons 2a in a plurality of (four) cylinders 2 extending in the vertical direction. One cycle of compression, expansion (combustion) and exhaust is continuously repeated to rotate the crankshaft 3. Here, in the engine 1, the direction in which the crankshaft 3 extends is taken as the X direction, and the direction orthogonal to the X direction in the horizontal direction is taken as the Y direction. Further, in the engine 1, a direction orthogonal to the X direction and the Y direction (the extending direction of the cylinder 2) is taken as a Z direction (vertical direction).

  Specifically, the engine 1 includes an aluminum alloy engine body 10 (an example of an internal combustion engine body) including a cylinder block 10a, a cylinder head 10b, a crankcase 10c, and a head cover 10d. The cylinder head 10b is fastened to the upper surface (Z1 side) of the cylinder block 10a. The crankcase 10c is fastened to the lower surface (Z2 side) of the cylinder block 10a. The head cover 10d is fastened to the top of the cylinder head 10b. Further, a crankshaft 3 is disposed in the crankcase 10c. The crankshaft 3 extends in the arrangement direction (X direction) of the cylinders 2.

  As shown in FIG. 2, an intake valve 4b and an exhaust valve 4c, which are periodically opened and closed by the rotation of a camshaft 4a, and an ignition plug 4d are incorporated in the cylinder head 10b. Further, the cylinder head 10b made of aluminum alloy has a combustion chamber 5, an intake port 51 for sending intake (intake air) to the combustion chamber 5, and an exhaust port 52 for discharging burned gas. An intake port 51, a combustion chamber 5 and an exhaust port 52 are disposed in the cylinder head 10b so as to correspond to the plurality of cylinders 2 (see FIG. 1) of the cylinder block 10a. The intake port 51 extends obliquely downward from the side surface of the cylinder head 10 b toward the combustion chamber 5. Further, the cylinder block 10a and the cylinder head 10b are provided with a water jacket 53 through which cooling water from a radiator (not shown) flows.

  Although FIG. 2 shows a cross-sectional view of one of the plurality (four) of cylinders 2, the other cylinders 2 also have the same configuration.

  Further, as shown in FIG. 1 and FIG. 2, the intake manifold 6 of the intake system 100 connected to the cylinder head 10 b is attached to the engine 1. The intake manifold 6 includes a surge tank 61, a plurality of (four) intake pipe sections 62 connected to the downstream side of the surge tank 61, and a plurality of (four) intake pipe sections 62 connected to the downstream side. And an insertion tube 63. The surge tank 61 side is the upstream side in the intake direction, and the combustion chamber 5 side is the downstream side in the intake direction.

  The surge tank 61, the intake pipe portion 62, and the insertion pipe portion 63 are made of a resin material that has a higher heat insulating property (lower thermal conductivity) than the aluminum alloy that constitutes the engine body 10. The surge tank 61, the intake pipe portion 62 and the insertion pipe portion 63 are integrally formed by resin welding or the like. Intake manifold 6 is connected (fixed) to engine body 10 with flange portion 62a formed integrally around the downstream end of intake pipe portion 62 in contact with the side surface of cylinder head 10b. There is. The flange portion 62a is formed with a circumferential groove portion 62c into which an O-ring 62b for sealing is fitted.

  Further, as shown in FIG. 2, a first intake passage 71 and a second intake passage 72 are formed in the intake pipe portion 62 and the insertion pipe portion 63, respectively. An intake passage 7 for supplying intake air to the combustion chamber 5 by connecting the internal space (not shown) of the surge tank 61 and the combustion chamber 5 by the first intake passage 71, the second intake passage 72, and the intake port 51. Is configured.

  The plurality of intake pipe sections 62 are arranged along the array direction (X direction) of the cylinders 2, and the air stored in the surge tank 61 corresponds to the corresponding intake port 51 (FIG. 2) have a role to distribute.

  The plurality of insertion pipes 63 are arranged along the arrangement direction (X direction) of the cylinders 2 in the same manner as the plurality of intake pipes 62. Further, the insertion pipe portion 63 is formed to extend along the direction in which the intake port 51 extends, and is configured to be inserted into the large diameter portion 51 a of the corresponding intake port 51 of the engine body 10.

  Here, as shown in FIGS. 2 and 3, in the state where intake manifold 6 is fixed to the side surface of cylinder head 10 b, insertion tube portion 63 has an outer peripheral surface 63 a of insertion tube portion 63 and an inside of large diameter portion 51 a. It is inserted in the large diameter portion 51 a of the intake port 51 with the air gap V being interposed between it and the circumferential surface 51 b.

  The insertion pipe portion 63 is provided with a flat partition portion 64 which divides the second intake passage 72. As illustrated in FIG. 2, the partition portion 64 is formed substantially at the center in the vertical direction of the second intake passage 72 in a cross section orthogonal to the X direction. Further, the partition portion 64 is formed so as to extend in a direction along the direction (intake direction) in which the intake flows through the intake passage 7. Further, as shown in FIG. 3, the partition portion 64 is formed to extend from the inner side surface on the X1 side of the second intake passage 72 to the inner side surface on the X2 side in a cross section orthogonal to the intake direction. As a result, the partition portion 64 divides the second intake passage 72 into the upper intake passage 72a on the Z1 side and the lower intake passage 72b on the Z2 side in the vertical direction.

  The upstream end 64 a of the partition 64 is located at the connection position between the intake pipe 62 and the insertion pipe 63 in the intake direction. That is, the upstream end 64 a of the partition 64 is located at the downstream end of the intake pipe 62 and at the upstream end of the insertion pipe 63. The upstream end 64 a of the partition 64 is located at the upstream end (the position corresponding to the outer surface 10 e) of the intake port 51 of the engine body 10. Furthermore, the upstream end 64a of the partition 64 is located at the same position as the flange 62a in the intake direction.

  Further, as shown in FIG. 3, in order to suppress the resistance (flow resistance) when the intake flows, the thickness t of the partition portion 64 is not damaged unless it is damaged due to the flow of the intake, the extrinsic body, etc. Is preferably as small as possible.

(Structure of TCV)
As shown in FIG. 2, the intake manifold 6 can be pivoted in the closing direction (see FIG. 4) closing the intake passage 7 around the axis 150 of the pivot shaft 81 and in the opening direction (see FIG. 4) opening the intake passage 7. And a TCV 8 (Tumble Control Valve, an example of an intake flow control valve) that controls the flow of intake air (degree of deflection). The TCV 8 is disposed inside the intake pipe portion 62 located upstream of the upstream end 64 a of the partition 64. As a result, the TCV 8 is disposed upstream of the upstream end 64 a of the partition 64. The air flow control device in the claims is configured by the intake pipe portion 62, the insertion pipe portion 63, and the TCV 8.

  As illustrated in FIG. 4, the TCV 8 includes a rotating shaft 81 and a plurality of (four) valve bodies 82. The pivot shaft 81 extends along an axis 150 extending in the X direction, and is formed to connect the valve bodies 82 adjacent to each other in the X direction. The pivot shaft 81 is rotatably attached to the intake pipe portion 62. An actuator AC (see FIG. 1) and a sensor (not shown) are attached to one end and the other end of the pivot shaft 81. The actuator AC adjusts the opening degree of the TCV 8 by rotating the rotation shaft 81 around the axis 150. The sensor is configured to detect the rotational state of the TCV 8 and to transmit the detection result to an ECU (Engine Control Unit, not shown). And according to the output of a sensor, the driving | running condition of the engine 1, etc., it is comprised by ECU so that the rotational angle (rotational state) of TCV8 may be determined.

  Further, as shown in FIG. 2, the axis 150 of the pivot shaft 81 is on the upstream side of the partition 64 in a cross section (Y-Z plane) in a direction orthogonal to the axial direction (X direction) of the pivot shaft 81. It is located on a line segment B extending from the end 64 a toward the upstream side in the intake direction.

  As shown in FIG. 4, each valve body 82 is disposed at both ends in the axial direction (X direction) along which the valve body 83 and the axis 150 of the pivot shaft 81 of the valve body 83 extend. A pair of connecting portions 84 for connecting the rotary shaft 81 and the rotary shaft 81 are provided.

  As shown in FIG. 5, the valve body 83 has a flat surface 83a located on the side of the pivot shaft 81, and a back surface 83b (an example of an opposing surface) located on the opposite side of the pivot shaft 81. Have. The back surface 83 b has a convex arc shape toward the side opposite to the rotation shaft 81 in the YZ plane. Specifically, the back surface 83 b has an arc shape centered on the axis 150 of the pivot shaft 81 in the YZ plane. That is, the distance L1 (the shortest distance) between the back surface 83b and the axis 150 is configured to be substantially constant over the entire back surface 83b.

  As a result, the valve body 83 has a so-called wing cross-sectional shape in the YZ plane. Further, as shown in FIG. 4, the blade cross-sectional shape of the valve body 83 is uniformly formed from one end of the valve body 83 in the X direction to the other end.

  Further, as shown in FIG. 8 to FIG. 13, when the valve body 82 is turned in the closing direction, the back surface 83 b having the convex arc shape of the valve body 83 is an end on the upstream side of the partition 64. It is arrange | positioned so as to oppose the part 64a. Further, as shown in FIGS. 9 and 12, the valve body 82 pivots about the axis 150 in a state where the back surface 83 b of the valve body 82 and the end 64 a on the upstream side of the partition 64 are separated by the minute gap M1. It is configured to Specifically, the distance L1 between the back surface 83b and the axis 150 is slightly smaller than the distance L2 between the axis 150 and the upstream end 64a of the partition 64. As a result, the partition portion 64 and the valve body 83 are configured to be able to separate the minute gap M1 (= L2-L1) regardless of the rotational state.

  As shown in FIG. 4, the pair of connection parts 84 are respectively disposed on the X1 side and the X2 side of the valve body 83. The connection portion 84 has a fan-like shape that is broadened as it is separated from the rotation shaft 81 when viewed in the X direction. That is, the surface 84 a on the opposite side to the pivot shaft 81 of the connection portion 84 has an arc shape. The distance (shortest distance) between the surface 84 a of the connection portion 84 and the axis 150 is approximately equal to the distance L 1 (see FIG. 9) between the back surface 83 b of the valve body 83 and the axis 150.

(Structure of the valve body accommodating portion)
As shown in FIGS. 5 and 6, in the vicinity of the downstream end of each intake pipe portion 62 of each intake manifold 6, a valve body accommodating portion 9 in which a valve body 82 is accommodated is formed. The valve body accommodating portion 9 includes a concave valve body main body accommodating portion 91 formed on the lower surface 62 d (surface on the Z2 side) of the intake pipe portion 62 and a pair formed on both side surfaces of the intake pipe portion 62 in the X direction. And a concave connection portion accommodating portion 92. The pair of connection portion accommodating portions 92 are formed to be connected to both sides of the valve body main portion accommodating portion 91 in the X direction.

  The valve body main body accommodation portion 91 is formed in a concave shape along the convex arc shape of the back surface 83 b of the valve body 83. Specifically, the inner surface 91a of the valve body main body housing 91 facing the back surface 83b of the valve body 83 in the open state shown in FIG. 4, FIG. 5 and FIG. Has a convex arc shape toward the opposite side. More specifically, the inner surface 91 a has an arc shape centered on the axis 150 of the pivot shaft 81 in the YZ plane. Further, the arc shape of the valve body 83 is uniformly formed from one end to the other end in the X direction of the valve body accommodation portion 91.

  Further, the distance (the shortest distance) between the inner surface 91 a and the axis 150 is formed to be substantially equal to the distance L 2 between the axis 150 and the upstream end 64 a of the partition 64. Furthermore, the distance L2 between the inner surface 91a and the axis 150 is configured to be substantially constant over the entire inner surface 91a. As a result, the inner surface 91a and the valve body 83 are configured to be able to separate the minute gap M2 (= L2-L1) regardless of the rotational state.

  Therefore, the valve body 83 is configured to be accommodated in the valve body accommodating portion 91 so as not to be exposed to the side of the intake passage 7 through which the intake air flows in the open state shown in FIG. 4, FIG. 5 and FIG. There is. In the open state, the surface 83 a of the valve body 83 is configured to be substantially flush with the lower surface 62 d of the intake pipe portion 62.

  As shown in FIG. 7, the pair of connection portion accommodating portions 92 are configured such that the corresponding connection portions 84 are accommodated. Further, as shown in FIG. 5, the connection portion accommodation portion 92 is formed in a fan shape such that the connection portion 84 does not abut over a range in which the valve body 82 can rotate as viewed from the X direction. There is. Specifically, the connection portion accommodating portion 92 has an arc shape centered on the axis 150 of the rotation shaft 81 in the YZ plane. As a result, the inner bottom surface 92a (an example of the arc portion) on the opposite side to the pivot shaft 81 of the connection portion accommodation portion 92 has an arc shape so as to correspond to the convex arc-shaped back surface 83b of the valve body 83. It is formed.

  Further, the connection portion accommodating portion 92 is formed in a fan shape having a central angle larger than the central angle of the fan shape of the connection portion 84. Furthermore, the distance between the inner bottom surface 92a and the axis 150 (the shortest distance) is substantially equal to the distance between the inner surface 91a and the axis 150 and the distance between the axis 150 and the upstream end 64a of the partition 64 (distance L2). It is formed as. As a result of these, the inner bottom surface 92a of the connection portion accommodation portion 92 and the surface 84a of the connection portion 84 are configured to be able to separate the minute gap M3 (= L2-L1) regardless of the rotation state.

  Further, as shown in FIG. 5, the inner bottom surface 92 a of the connection portion housing portion 92 is formed to be connected to the inner surface 91 a of the valve body main portion housing portion 91. Further, the inner bottom surface 92 a of the connection portion accommodation portion 92 is formed to a position above the upstream end portion 64 a of the partition portion 64. As a result, the valve body 82 is configured to be rotatable so as to cover the entire lower intake passage 72b and a part of the upper intake passage 72a. Further, of the inner bottom surface 92a of the connection portion storage portion 92, the inner bottom surface 92a of the connection portion storage portion 92 located at the upstream end portion 64a of the partition portion 64 when viewed from the X direction It is configured to be substantially flush with the end 64a.

  Further, as shown in FIG. 7, the connection portion 84 is configured to be accommodated in the connection portion accommodation portion 92 so as not to be exposed to the intake passage 7 side through which the intake flows, regardless of the rotational state of the valve body 82. It is done.

(Tcv opening and closing)
In intake manifold 6, when performing intake to each cylinder 2, four TCVs 8 are operated by actuator AC (see FIG. 1) to control the opening area (flow passage cross-sectional area) of each intake passage 7 Is configured. Specifically, when the actuator AC is actuated, the valve body 83 is between the open state shown in FIGS. 4, 5 and 7 and the closed state (maximum closed state) shown in FIGS. Steplessly controlled to any posture. In the engine 1, the ECU drives the actuator AC based on the opening information of the TCV 8 to perform attitude control of the TCV 8 such that the opening degree becomes optimal according to the operating state (load state) of the engine 1. It will be. Further, the posture control of the valve body 82 is repeated by feeding back the opening degree of the valve body 82 which is grasped on the ECU side.

<Intake flow>
In the intake manifold 6, the TCV 8 is rotated (opened / closed) to control the cross-sectional area of the flow passage of the intake passage 7, and a predetermined air flow shape is given to the intake air supplied to the combustion chamber 5. Specifically, in the open state shown in FIGS. 4, 5 and 7, the valve body 83 is accommodated in the valve body accommodation portion 91. As a result, it is possible to reliably increase the amount of intake air under the high rotation and high load conditions of the engine 1 where the amount of intake air needs to be increased. Furthermore, in the open state, the surface 83a of the valve body 83 and the lower surface 62d of the intake pipe portion 62 become substantially flush, so that the disturbance of the intake flow in the intake passage 7 is suppressed.

  Then, when the valve body 82 is turned in the closing direction from the open state, the flow passage cross-sectional area of the intake passage 7 gradually decreases. In the closed state in which only the lower intake passage 72b is closed as shown in FIGS. 8 to 10, one end 83c on the downstream side of the valve body 83 is in the intake direction with the upstream end 64a of the partition 64. opposite. Here, since the partition 64 and the valve body 83 are in close proximity to each other with the micro clearance M1, the flow of intake air to the lower air intake passage 72b is almost eliminated. As a result, the amount of intake air flowing through the upper intake passage 72a increases, and the flow velocity of intake air increases. As a result, tumble (vertical vortex) increases in the combustion chamber 5 of the engine 1.

  Then, the valve body 82 is further pivoted in the closing direction from the closed state in which only the lower intake passage 72b is closed, the entire lower intake passage 72b shown in FIGS. 11 to 13 and a part of the upper intake passage 72a. In the closed state (maximum closed state) in which the valve is closed, the back surface 83b of the valve body 83 is formed into a convex arc shape toward the upstream end 64a of the partition 64, whereby the partition The state in which the valve body 64 and the valve body 83 are in close proximity to each other with the minute gap M1 therebetween is maintained. As a result, almost no intake flow to the lower intake passage 72b is maintained.

  Further, by further rotating the valve body 82 in the closing direction from the closed state in which only the lower intake passage 72b is closed, the flow passage cross-sectional area of the upper intake passage 72a is further reduced. Thereby, the flow velocity of the intake air flowing through the upper intake passage 72a becomes higher. As a result, the tumble (longitudinal vortex) in the combustion chamber 5 of the engine 1 is further increased.

(Effect of the first embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, by forming the back surface 83b of the valve body 82 in a convex arc shape toward the end 64a, the upstream end 64a and the back surface 83b of the partition 64 can be obtained. Even if the position of the back surface 83b directly facing the upstream end 64a of the partition 64 is changed by the rotation of the valve 82 from the opposite state, Unlike in the case where the facing surface is flat, the separation distance between the upstream end 64 a of the partition 64 and the back surface 83 b can be suppressed from increasing. Thus, a large gap can be suppressed from being formed between the upstream end portion 64a of the partition 64 and the back surface 83b. Therefore, in the second intake passage 72 partitioned by the partition 64, It is possible to suppress the intake air from flowing into the lower intake passage 72b blocked by the valve body 82. As a result, it is possible to suppress a decrease in the amount of intake air flowing through the lower intake passage 72b, and to suppress a decrease in the flow velocity of intake air, so suppressing a decrease in tumble. it can. Therefore, the combustion speed of the engine 1 can be improved to improve the thermal efficiency of the engine 1, and therefore, the fuel efficiency of the vehicle equipped with the engine 1 can be improved.

  Further, in the first embodiment, the lower side intake passage among the second intake passages 72 partitioned by the partition portion 64 by the upstream end portion 64a of the partition portion 64 and the back surface 83b separating the minute gap M1. It is possible to reliably suppress the intake air from flowing into 72b. This makes it possible to reliably suppress the decrease in tumble. Further, since the minute gap M1 can prevent the upstream end 64a of the partition 64 from coming into contact with the valve body 82, the partition 64 can be a resistance to the rotation of the valve 82. It can be suppressed.

  Further, in the first embodiment, the inner bottom surface 92 a of the connection portion accommodation portion 92 corresponding to the upstream end portion 64 a of the partition portion 64 and the upstream end portion 64 a of the partition portion 64 should be substantially flush. Thus, it is possible to suppress separation of the inner bottom surface 92a of the connection portion accommodation portion 92 in which the connection portion 84 of the valve body 82 is accommodated, and the upstream end portion 64a of the partition portion 64. In the above, the upstream end 64a of the partition 64 and the back surface 83b of the valve body 82 can be easily configured to separate the minute gap M1. In addition, since the connection portion accommodation portion 92 can suppress the connection portion 84 of the valve body 82 from being located in the intake passage 7, it is possible to suppress the connection portion 84 from becoming a flow resistance of intake air. it can.

  Further, in the first embodiment, as described above, the valve body 82 is configured to be rotatable so as to cover the entire lower intake passage 72b, so that the back surface 83b of the valve body 83 is convex. The valve body 82 formed in an arc shape can suppress intake air from flowing into the lower intake passage 72b. As a result, the amount of intake air flowing through the upper intake passage 72a can be suppressed from being reduced, and the flow rate of intake air can be suppressed from being reduced. Furthermore, the valve body 82 covers a part of the upper intake passage 72a, whereby the flow velocity of the intake air flowing through the upper intake passage 72a can be effectively increased. As a result of these, the tumble can be effectively increased.

  Further, in the first embodiment, the insertion pipe portion 63 is made of a resin material having a heat insulating property higher than that of the aluminum alloy engine body 10. Thus, the heat conduction in the insertion tube 63 can be suppressed, so the heat of the aluminum alloy engine body 10 is transmitted to the intake air flowing through the second intake passage 72 in the insertion tube 63. Can be suppressed. As a result, it is possible to suppress an increase in the temperature of the intake air flowing through the second intake passage 72, thereby suppressing a decrease in the amount of intake air introduced into the combustion chamber 5 due to the expansion of the intake air. can do. Furthermore, since the rise in temperature of the intake air can be suppressed, the occurrence of knocking can be suppressed, so that ignition can be performed at the optimal ignition timing. As a result, the output and fuel efficiency of the engine 1 can be improved.

  Further, in the first embodiment, the insertion pipe portion 63 is inserted into the intake port 51 with the air gap V interposed between the outer peripheral surface 63 a of the insertion pipe portion 63 and the inner peripheral surface 51 b of the intake port 51. Thus, the heat of the engine body 10 made of an aluminum alloy can be prevented from being transmitted to the insertion tube portion 63 by the air gap V capable of suppressing the conduction of heat. As a result, since the temperature of the second intake passage 72 can be suppressed from rising, it is possible to suppress the decrease in the amount of intake introduced into the combustion chamber 5 due to the expansion of the intake. .

  In the first embodiment, the arc-shaped surface 84 a of the connection portion 84 and the arc-shaped inner surface 92 a of the connection portion accommodation portion 92 are connected to each other by connecting the arc-shaped inner surface 91 a of the valve body main portion 91 The valve body 82 provided with the above can be reliably rotated without contacting the valve body accommodation portion 9.

  In the first embodiment, the upstream end 64 a of the partition 64 is disposed at the same position as the flange 62 a in the intake direction. Thereby, it can suppress that partition part 64 itself becomes distribution resistance of intake compared with a case where a partition part is formed to the upper stream side rather than flange part 62a.

  In the first embodiment, the upstream end 64 a of the partition 64 is disposed at the upstream end of the intake port 51 of the engine body 10. As a result, compared to the case where the partition portion is formed further to the upstream side than the intake port 51 of the engine main body 10, it is possible to suppress that the partition portion 64 itself becomes the flow resistance of the intake air. Further, compared with the case where the upstream end 64a of the partition 64 is formed downstream of the upstream end of the intake port 51 of the engine body 10, the flow velocity of intake air by dividing the intake passage 7 is It can suppress that it does not become large enough.

  Further, in the first embodiment, the intake manifold 7 which constitutes the intake passage 7 and in which the partition portion 64 and the TCV 8 are provided is used. Thus, the partition portion 64 and the TCV 8 are provided in an integral member (intake manifold 6), so that the assembling performance when assembling the intake manifold 6 to the engine main body 10 can be improved.

Second Embodiment
Next, an intake manifold 206 (one example of an intake system for an internal combustion engine) according to a second embodiment of the present invention will be described with reference to FIGS. In this second embodiment, unlike the configuration of the first embodiment, an example will be described in which the casing 212 provided separately from the intake manifold 206 rotatably supports the TCV 8. In addition, about the structure similar to 1st Embodiment, while attaching | subjecting the same code | symbol, description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 14, the intake system 200 includes a TCV assembly 211 (an example of an air flow control device) and an intake manifold 206. The TCV assembly 211 and the intake manifold 206 are attached to the engine body 10 as shown in FIG.

  Specifically, intake manifold 206 is attached to engine body 10 by being fastened by fastening member BO (see FIG. 14) with flange portion 62a in contact with the side surface of cylinder head 10b of engine body 10 It is done. The TCV assembly 211 is disposed on the side of the engine body 10 of the intake manifold 206 in a state where the intake manifold 206 is attached to the engine body 10. The TCV assembly 211 is attached to the engine body 10 by being pinched between the engine body 10 and the intake manifold 206 in the intake direction.

  The TCV assembly 211 includes the TCV 208 and the same number of casings 212 as the number of cylinders (four) of the engine 1, as shown in FIG. The TCV 208 includes a rotating shaft 81, the same number of rotatable valve bodies 82 as the number of cylinders (four) of the engine 1, a bearing member 281a fitted on the rotating shaft 81, an actuator AC and a sensor SE. It is. As in the first embodiment, the back surface 83 b of the valve body 83 of the valve body 82 is formed in a convex arc shape toward the end 64 a of the partition 64. Further, when the valve body 83 is in the open state, the whole is housed in a valve body housing portion 291 formed by the intake manifold 206 and the casing 212.

  The casing 212 is made of a resin material that has higher thermal insulation (lower thermal conductivity) than the aluminum alloy that constitutes the engine body 10. Further, each of the plurality of casings 212 is provided with a downstream insertion pipe 263 (an example of a pipe) provided on the downstream side (the cylinder 2 side) and an upstream insertion provided on the upstream side (the intake manifold 206 side). It has a tube portion 213 and a circumferential collar portion 214. As shown in FIG. 15, the downstream side insertion pipe portion 263 is inserted into the large diameter portion 51 a of the corresponding intake port 51 of the engine body 10. The upstream insertion pipe portion 213 is inserted into the corresponding upstream passage 271 of the intake manifold 206. The collar part 214 is provided between the downstream insertion pipe part 263 and the upstream insertion pipe part 213, as shown in FIG. 14, and protrudes outward.

  The downstream insertion pipe portion 263 is formed in a cylindrical shape (tubular shape), and constitutes a downstream side passage 272 of the intake passage 207. Further, inside the downstream side insertion pipe portion 263, a flat plate-like partition portion 64 which divides the downstream side passage 272 is provided.

  The upstream insertion pipe portion 213 is formed in a cylindrical shape (tubular shape), and constitutes a downstream portion of the upstream passage 271 of the intake passage 207. In addition, as shown in FIG. 16, a first valve cut in an arc shape so as to constitute a downstream side portion of the valve body main body storage portion 291 in the vicinity of the upstream end portion of the upstream insertion pipe portion 213 A body main body storage portion 291b (an example of a valve storage portion) is provided. The first valve body main body housing portion 291b is formed in an arc shape from the downstream end of the valve body main body housing portion 291 to the lowermost point (a position farthest from the intake passage 207) There is. As a result, when the casing 212 is integrally molded, the mold (not shown) used for molding can be easily removed from the casing 212 while molding the first valve body main body housing portion 291b notched in an arc shape. Is possible.

  Further, fitting portions 213a (an example of a support portion) for fixing the bearing member 281a to the casing 212 are formed on both side surfaces in the X direction of the upstream side insertion tube portion 213 by fitting the bearing members 281a. ing. The fitting portion 213a rotatably supports the pivot shaft 81 of the TCV 208 via the bearing member 281a.

  In addition, as shown in FIG. 14, spacers 281 b that rotatably support the pivot shaft 81 are disposed between the casings 212 in the X direction.

  In the vicinity of the downstream end of the intake manifold 206, a recess 215 in which the flange portion 214 of the casing 212 and the rubber gasket 262a are disposed is formed. Further, the upstream side of the recess 215 of the intake manifold 206 is divided into the intake pipe sections 62. A large diameter portion 216 is formed on the inner surface of each intake pipe portion 62.

  As shown in FIG. 16, the upstream insertion pipe portion 213 of the corresponding casing 212 is inserted into the large diameter portion 216. When the upstream insertion pipe portion 213 is inserted into the large diameter portion 216, the upstream portion and the downstream portion of the upstream passage 271 are configured to be substantially flush.

  Further, on the upstream side of the large diameter portion 216, a second valve body main body housing portion 291c which is notched in an arc shape so as to constitute a portion on the upstream side of the valve body main body housing portion 291 is provided. The second valve body main body housing portion 291 c is formed in an arc shape from the upstream end of the valve body main body housing portion 291 to the lowermost point (a position farthest from the intake passage 207). ing. As a result, when integrally molding the intake manifold 206, it is possible to easily form a mold (not shown) used for molding from the intake manifold 206 while molding the second valve body main body housing portion 291c which is notched in an arc shape. It is possible to remove.

  Further, by connecting the first valve body main portion 291b of the upstream insertion pipe portion 213 and the second valve body main portion 291c of the intake manifold 206, the inner surface 291a of the valve body main portion 291 is a valve. A concave shape is formed along the convex arc shape of the back surface 83 b of the body 83. The second valve body main body storage 291 c on the upstream side of the valve body main body storage 291 is provided in the intake manifold 206, and the first valve body main body storage 291 b on the downstream side of the valve body main body 291 is a casing 212. It is provided.

  Here, in the second embodiment, in the casing 212, the downstream side insertion pipe portion 263, the partition portion 64, the first valve body main body accommodation portion 291b, and the fitting portion 213a are integrally provided. Specifically, the casing 212 is integrally formed of resin, and the upstream insertion pipe portion 263 in which the partition portion 64 is provided, the first valve body main body accommodation portion 291 b, and the fitting portion 213 a. The side insertion tube portion 213 and the collar portion 214 are integrally provided. As a result, it is possible to strictly control the positions of the partition portion 64, the first valve body main body accommodation portion 291b, and the fitting portion 213a by integral molding. Furthermore, since the casing 212 is a smaller member than the intake manifold 206, the adjustment of the minute gap M1 can be more accurately performed during integral molding.

  In the second embodiment, the intake manifold 206 is provided to cover the upstream insertion pipe portion 213 and the collar portion 214 by the upstream insertion pipe portion 213 and the collar portion 214 of the casing 212 being fitted. . Further, the downstream end surface of the flange portion 62 a of the intake manifold 206 is in contact with the engine body 10. Then, the gasket 262 a is sandwiched in a direction perpendicular to the intake direction between the contact portion T 1 between the intake manifold 206 and the engine body 10 and the contact portion T 2 between the flange portion 214 of the casing 212 and the engine body 10. It is arranged. Then, the flange portion 214 of the casing 212 is sandwiched in the intake direction by the step portion 217 of the intake manifold 206 located at the boundary between the recess portion 215 and the large diameter portion 216 and the engine body 10.

  Here, when the engine body 10 and the intake manifold 206 are fixed, the flange portion 214 of the casing 212 and the gasket 262 a are pressed toward the engine body 10 by the step portion 217. As a result, a pressing force along the intake direction from the step portion 217 and a reaction force (elastic force) in a direction orthogonal to the intake direction generated from the rubber gasket 262a are applied to the flange portion 214 of the casing 212. Thus, the casing 212 is securely fixed between the engine body 10 and the intake manifold 206. The remaining structure of the second embodiment is similar to that of the aforementioned first embodiment.

(Effect of the second embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, the back surface 83b of the valve body 82 is formed in a convex arc shape toward the end 64a, so that combustion occurs in the engine 1 as in the first embodiment. Since the speed can be improved and the thermal efficiency of the engine 1 can be improved, the fuel efficiency of the vehicle equipped with the engine 1 can be improved.

  Further, in the second embodiment, in the casing 212, the downstream side insertion pipe portion 263, the partition portion 64, the first valve body main body accommodation portion 291b, and the fitting portion 213a are integrally provided. Thus, the valve body of the TCV 208 supported by the fitting portion 213a integrally provided with the partition portion 64 and partially disposed in the first valve body main body housing portion 291b integrally provided with the partition portion 64 The clearance (clearance) between 82 and the end 64 a of the partition 64 can be easily adjusted to be small. As a result, in the downstream side passage 272 partitioned by the partition portion 64, it is possible to reliably suppress the intake air from flowing into the lower side intake passage 72b blocked by the valve body 82. It is possible to reliably suppress a reduction in the amount of intake air flowing through the upper intake passage 72a not blocked by the valve body 82 among 272.

  Further, in the second embodiment, by providing the casing 212 of the TCV assembly 211 separately from the intake manifold 206, the TCV assembly 211 can be removed separately from the intake manifold 206, so the fitting portion 213a of the casing 212 can be removed. The operability of the replacement of the TCV 208 supported by

  Further, in the second embodiment, the gasket 262a is disposed so as to be sandwiched between the contact portion T1 between the intake manifold 206 and the engine body 10 and the contact portion T2 between the casing 212 and the engine body 10. Thus, the seal between the intake manifold 206 and the engine body 10 and the seal between the casing 212 and the engine body 10 can be realized by the gasket 262a, so the seal between the intake manifold and the engine body and the casing It is possible to suppress an increase in the number of parts as compared with the case where the seal between the engine body and the engine body is separately performed.

  Further, in the second embodiment, the step portion 217 of the intake manifold 206 is configured to press the flange portion 214 and the gasket 262 a of the casing 212 toward the engine body 10. Thereby, the pressing force along the intake direction from the step portion 217 and the reaction force (elastic force) in the direction orthogonal to the intake direction generated from the rubber gasket 262a can be applied to the collar portion 214 of the casing 212. it can. As a result, the casing 212 can be securely fixed, and the number of parts and the number of assembling steps can be reduced because it is not necessary to separately use a fastening member only to fix the casing 212.

  Further, in the second embodiment, the upstream side (second valve body main portion 291c) of the valve body main portion 291 is provided in the intake manifold 206, and the downstream side of the valve body main portion 291 (first valve body main portion The part 291 b) is provided on the casing 212. Thus, for example, the concave valve body main body housing portion 291 can be easily formed as compared to the case where the entire concave portion is provided in only one of the casing and the intake manifold.

  In the second embodiment, the casing 212 is made of resin so that the downstream insertion pipe portion 263, the partition portion 64, the first valve body housing portion 291b, and the fitting portion 213a are integrally molded in the casing 212. It can be easily provided integrally by resin molding such as. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Modification]
It should be understood that the embodiment disclosed herein is illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description of the embodiment but by the scope of claims, and further includes all modifications (variations) within the meaning and scope equivalent to the scope of claims.

  For example, although the example which used the intake manifold 6 which comprised the partition part 64 and TCV8 while comprising the intake passage 7 in the said 1st Embodiment was shown, this invention is not limited to this. In the present invention, as in the first modified example shown in FIG. 17, a TCV assembly 308 provided with a partition 64 (insertion tube 63) and a TCV 8 with a configuration different from that of the intake device 200 of the second embodiment. The air intake device 300 may be configured such that (an example of the air flow control device) is provided separately from the intake manifold 306. In this case, the upstream passage 371 as a part of the intake passage 307 is provided inside the intake manifold 306, and the downstream passages 372a and 372b as a part of the intake passage 307 are provided inside the TCV assembly 308. Be The TCV assembly 308 is then attached to the engine body 10 and the intake manifold 306 so as to be sandwiched between the engine body 10 and the intake manifold 306. In this manner, by providing the TCV assembly 308 separately from the intake manifold 306, it is possible to improve the workability of replacing the TCV 8.

  In the first and second embodiments, the shape of one end 83c of the valve body 82 may be made different. For example, as in the second modified example shown in FIG. 18, in the valve body 482 of the TCV 408, one end 483c of the valve body 483 may be formed in a smooth arc shape (round shape). In this case, in the closed state, it is preferable that the surface 83a of the valve body 483 and the surface on the Z1 side of the partition 64 be gently connected so as to be flush with each other. As a result, since the intake can be guided by the valve body 483 to flow in the intake direction, it is possible to increase the flow in the intake direction. As a result, it is possible to effectively increase the tumble.

  In the first and second embodiments, the intake device (air flow control device) of the present invention is applied to the engine 1 (internal combustion engine) having four cylinders 2. However, the present invention is not limited thereto. I can not. In the present invention, the intake system (air flow control device) of the present invention may be applied to an internal combustion engine having one to three cylinders or five or more cylinders.

  In the first and second embodiments, the back surface 83b (facing surface) of the valve body 83 has an arc shape with the axis 150 of the pivot shaft 81 as a center, but the present invention is limited thereto I can not. In the present invention, the opposing surface of the valve body only needs to have a convex arc shape, and may not have an arc shape centered on the axis of the rotation shaft. Note that, by forming the opposing surface of the valve body main body so as to have a shape close to an arc shape centered on the axis of the rotation shaft, regardless of the rotation state, it faces the upstream end of the partition portion It is possible to make the gap with the surface minute.

  Further, in the first and second embodiments, an example is shown in which the partition 64 is formed substantially at the center in the vertical direction of the second intake passage 72 (the downstream passage 272) in a cross section orthogonal to the X direction. In the first and second embodiments, the partition 64 is formed to extend in a direction along the direction (intake direction) in which the intake flows through the intake passage 7 (207). It is not restricted to this. In the present invention, the partition may be provided, for example, at a position other than the approximate center of the intake passage in the vertical direction, as long as the partition can divide the intake passage. It may be formed to extend in an inclined direction. In addition, it is preferable to form the partition part so as to extend in the direction along the intake direction, because the flow of intake air is less likely to be blocked by the partition part.

  Moreover, although the example which provided the valve body accommodating part 9 in which the valve body 82 is accommodated in the inner surface of the intake passage 7 was shown in 1st Embodiment, this invention is not limited to this. In the present invention, it is not necessary to provide the valve body accommodation portion in which the valve body is accommodated on the inner surface of the intake passage. Further, for example, only one of the connection portion accommodating portion or the valve body main portion may be provided among the valve body accommodating portions, and the other of the connection portion accommodating portion or the valve body main portion may not be provided.

  In the first and second embodiments, the upstream end 64a of the partition 64 is disposed at the same position as the flange 62a in the intake direction, and at the upstream end of the intake port 51 of the engine body 10. Although the arranged example is shown, the present invention is not limited to this. In the present invention, the position of the upstream end of the partition portion is not particularly limited.

  Moreover, although the valve body 82 showed the example which has a pair of fan-shaped connection part 84 in 1st and 2nd embodiment, this invention is not limited to this. In the present invention, the connection portion of the valve body may not be fan-shaped. Moreover, you may provide only one connection part in a valve body.

  In the second embodiment, the TCV assembly 211 includes the plurality of casings 212. However, the present invention is not limited to this. For example, a plurality of casings 212 shown in the second embodiment may be connected in a direction adjacent to each other to form one casing.

  Further, in the second embodiment, an example is shown in which the casing 212 rotatably supports the pivot shaft 81 by the bearing member 281a being fitted into the fitting portion 213a, but the present invention is not limited to this. . In the present invention, the casing may support the pivot shaft so as to be able to pivot directly without the aid of a bearing member.

1 Engine (internal combustion engine)
5 combustion chamber 6, 206, 306 Intake manifold (intake device)
7, 207, 307 intake passage 8, 208, 408 TCV (intake flow control valve)
10 Engine body (internal combustion engine body)
62d inner surface 64 partition part 64a (upstream side of partition part) end 72a upper intake passage 72b lower intake passage 81 pivot shaft 82, 482 valve body 83, 483 valve body main body 83b back surface (facing surface)
84 connection part 92 connection part accommodation part 92a inner bottom surface (arc part)
100, 200, 300 Intake system of internal combustion engine 150 Axis 211, 308 TCV assembly (air flow control device)
212 casing 213a fitting portion (supporting portion)
263 Downstream insertion tube (tube)
271 upstream passage 272 downstream passage 291b first valve body accommodating portion (valve accommodating portion)
308 TCV assembly (air flow control device)
M1 small clearance

Claims (6)

An intake passage communicating with a combustion chamber of an internal combustion engine body and supplying intake air to the combustion chamber;
A partition which is provided in the intake passage and divides the intake passage;
A pivot shaft is disposed upstream of an end on the upstream side of the partition, and can be pivoted in a closing direction for closing the intake passage and an opening direction for opening the intake passage around an axis of the pivot shaft An intake flow control valve provided;
When the intake flow control valve is rotated in the closing direction, an opposing surface facing the upstream end of the partitioning portion is the partitioning portion in a cross section in a direction orthogonal to the axial direction of the pivoting shaft An intake system for an internal combustion engine, comprising: a valve body formed in a convex arc shape toward an upstream end of the valve.   The internal combustion engine according to claim 1, wherein the valve body is configured to rotate about the axis in a state where the opposing surface and the upstream end of the partition part have a small gap therebetween. Inspiratory device. The valve body further includes a valve body main body provided with the opposing surface, and a connection portion disposed at an end in the axial direction and connecting the valve body main body and the pivot shaft,
It further comprises a connecting part accommodating part provided concavely on the inner surface of the intake passage and accommodating the connecting part of the valve body,
The connecting portion accommodating portion is formed in a fan shape having an arc portion corresponding to a convex arc shape of the facing surface of the valve body in a cross section in a direction orthogonal to the axial direction.
3. The intake air for an internal combustion engine according to claim 2, wherein the arc portion of the connection portion accommodation portion corresponding to the upstream end portion of the partition portion and the upstream end portion of the partition portion are flush with each other. apparatus. The partition part divides the intake passage into an upper intake passage and a lower intake passage,
The internal combustion engine according to any one of claims 1 to 3, wherein the valve body is configured to be rotatable so as to cover the entire lower intake passage and a part of the upper intake passage. Inspiratory system. An intake manifold including an upstream passage that constitutes the upstream intake passage;
The fuel cell system further includes an air flow control device that includes the intake flow control valve and a casing in which the intake flow control valve is disposed, and is disposed on the internal combustion engine main body side of the intake manifold.
In the casing, a pipe portion forming a downstream side passage forming the downstream side intake passage, the partition portion, a valve storage portion in which at least a part of the intake flow control valve is disposed, and the valve The intake system for an internal combustion engine according to any one of claims 1 to 4, wherein a support portion for rotatably supporting the pivot shaft of the intake flow control valve in the housing portion is integrally provided. . An air flow control device attached to an internal combustion engine main body, comprising:
A partition which is provided in an intake passage for supplying intake air to a combustion chamber of the internal combustion engine main body, and which divides the intake passage;
A pivot shaft is disposed upstream of an end on the upstream side of the partition, and can be pivoted in a closing direction for closing the intake passage and an opening direction for opening the intake passage around an axis of the pivot shaft An intake flow control valve provided;
When the intake flow control valve is rotated in the closing direction, an opposing surface facing the upstream end of the partitioning portion is the partitioning portion in a cross section in a direction orthogonal to the axial direction of the pivoting shaft An airflow control device, comprising: a valve body formed in a convex arc shape toward an upstream end of the valve.

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