JP4728195B2 - Engine intake control device - Google Patents

Description

  The present invention relates to an intake control device for an engine for generating a tumble in a cylinder.

  Examples of conventional intake control devices for this type of engine include those disclosed in Patent Literature 1 and Patent Literature 2. The engine intake control device shown in these Patent Documents 1 and 2, a partition plate that partitions the intake passage in the engine into an upper intake passage and a lower intake passage when viewed from the axial direction of the crankshaft, And a tumble control valve provided near the upstream side of the partition plate for opening and closing the lower intake passage.

  The intake control device shown in Patent Document 1 includes a rectifying member that regulates the direction of intake air flow in conjunction with a tumble control valve. This rectifying member constitutes both side walls of the downstream end portion of the upper intake passage, and when the tumble control valve is open, it is located away from the intake valve upstream, and the tumble control valve is closed. When it is, it moves to a position close to the intake valve.

When the rectifying member approaches the intake valve, the intake air is collected in the vicinity of the center of the combustion chamber when viewed from the axial direction of the cylinder, so that tumble is likely to occur.
In this manner, the function of changing the direction of intake air flow so that tumble is likely to occur is realized by bringing the partition plate closer to the intake valve in the intake air control device shown in Patent Document 2. The partition plate of the intake control device shown in Patent Document 2 is provided in the cylinder head so as to be movable along the intake passage, and is configured to move in parallel with the opening and closing of the tumble control valve.

In the intake air control devices disclosed in these Patent Documents 1 and 2, by closing the tumble control valve, the intake air mainly flows through the upper intake passage. At the same time, in this intake control device, the flow direction of the intake air is restricted by the movement of the rectifying member and the partition plate toward the intake valve. As a result, in an engine equipped with the intake control device shown in Patent Document 1 or Patent Document 2, tumble is generated in the cylinder by the intake air flowing into the cylinder from the upper intake passage. The tumble refers to a swirling flow of intake air that swirls around a center line extending in a direction intersecting the cylinder axis.
JP 2003-239751 A JP 2003-278551 A

In the conventional intake control device configured as described above, there is a limit in generating tumble more effectively. This is presumably because the intake resistance increases due to the closing of the tumble control valve, and the so-called flow coefficient is greatly reduced.
Further, the above-described conventional intake control device has to be equipped with a rectifying member and a partition plate that are movable in order to easily generate tumble, and has a complicated structure.

  The present invention has been made to solve such problems, and an object thereof is to provide an intake control device for an engine that can generate more effective tumble in a cylinder while adopting a simple structure. To do.

In order to achieve this object, an intake control apparatus for an engine according to the present invention is provided in an intake passage extending obliquely upward from a combustion chamber when viewed from the axial direction of the crankshaft, and the upper intake passage is formed in the intake passage. An engine intake control device comprising: a partition plate for partitioning into an intake passage and a lower intake passage; and a tumble control valve provided near the upstream side of the partition plate in the intake passage and opening and closing a part of the intake passage. The tumble control valve is configured to open and close the intake passage above the partition plate, and a bottom wall located on the opposite side of the partition plate from the wall forming the vicinity of the inlet of the lower intake passage is provided. progressively away from the partition plate toward the upstream side, and downstream extension of the bottom wall is formed to be inclined so as to intersect with the partition plate, below this inclined bottom wall The bottom wall of the intake passage side are those formed along the partition plate.

An engine intake control device according to a second aspect of the present invention is the engine intake control device according to the first aspect, wherein the extension is extended from the partition plate toward the combustion chamber when viewed from the axial direction of the crankshaft. The partition plate is inclined so that the line passes between the center of the lower surface of the valve body of the intake valve and the edge located on the center side of the combustion chamber on the lower surface of the valve body.
The engine intake control device according to claim 3 is the engine intake control device according to claim 1 or 2, wherein an inclination angle of the inclined bottom wall with respect to the partition plate is about 25 ° to about 25 °. It is set to 30 °.
An engine intake control device according to a fourth aspect of the present invention is the engine intake control device according to any one of the first to third aspects, wherein the upstream end of the inclined bottom wall is the partition. It is connected to a straight line portion extending in parallel with the plate.
An engine intake control device according to a fifth aspect of the present invention is the engine intake device according to any one of the first to fourth aspects, wherein the intake passage extending obliquely upward from the combustion chamber comprises: An intake passage in the auxiliary intake manifold attached to the cylinder head and an intake port of the cylinder head are configured. The partition wall is supported by the upstream partition plate supported by the auxiliary intake manifold and the cylinder head. The tumble control valve is supported by the auxiliary intake manifold.

  According to the present invention, the intake air flows only into the intake passage below the partition plate by closing the tumble control valve. The lower intake passage is inclined so that the bottom wall near the inlet gradually moves away from the partition plate toward the upstream side, so that the inlet is wide and intake air easily flows.

  In addition, the direction of flow of the intake air flowing in the vicinity of the bottom wall is changed by hitting the bottom wall and flows toward the partition plate. At this time, the bottom wall formed near the entrance of the lower intake passage substantially functions as an air funnel. For this reason, according to the intake control device of the present invention, the flow rate coefficient of the intake air in the state where the tumble control valve is closed despite the partition plate in the intake passage is compared with the conventional intake control device. Become bigger.

  As a result, in this intake control device, by closing the tumble control valve, a large amount of intake air can flow along the partition plate in the vicinity of the partition plate in the lower intake passage. In this state where the intake air is concentrated and distributed in the vicinity of the partition plate, in other words, in a state where a large amount of air flows in the central portion of the intake passage composed of the upper intake passage and the lower intake passage, the axial direction of the crankshaft As seen from the side, the gas flows obliquely into the cylinder through between the outlet of the intake passage and the intake valve.

That is, the intake air can be sent into the cylinder so as to pass through the center of the combustion chamber when viewed from the axial direction of the cylinder without using a rectifying member that moves in conjunction with the tumble control valve.
In this way, the intake flows obliquely into the cylinder so that the intake air gathers in the vicinity of the axial center of the cylinder, thereby generating tumble effective for combustion in the cylinder. Effective tumble here refers to a tumble in which the state in which the intake air swirls continues until the end of the compression stroke.

It can be considered that when so-called strong tumble is generated in the cylinder in this way, the air-fuel mixture flows violently in the combustion chamber at the end of the compression stroke and immediately before ignition, so that combustion is favorably performed.
On the other hand, when the tumble control valve is opened, a large amount of intake air flows into the cylinder through both the upper intake passage and the lower intake passage, and a large output can be obtained in the engine.

  Therefore, in the engine equipped with the intake control device according to the present invention, by closing the tumble control valve, the tumble effective for combustion is generated as described above, and the fuel efficiency is improved and the harmful substances in the exhaust gas are removed. Occurrence can be suppressed. Further, in this engine, a high rotation and high output operation is possible by opening the tumble control valve.

  According to the second aspect of the invention, of the intake air that flows into the cylinder through the lower intake passage with the tumble control valve closed, the intake air that hits the valve body of the intake valve is the axis of the crankshaft. As seen from the direction, it flows on the opposite side of the intake passage. Therefore, according to the present invention, since it is possible to prevent the intake air from flowing in the direction of weakening the tumble by hitting the valve body of the intake valve, it is possible to generate a more effective tumble.

Hereinafter, an embodiment of an engine intake control device according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a front view of an engine equipped with an intake air control device according to the present invention. In FIG. 1, the upstream portion of the intake passage is cut away. FIG. 2 is an enlarged cross-sectional view showing the main part, and FIG. 3 is an enlarged cross-sectional view showing a mounting portion of the in-cylinder injector. 4 is a cross-sectional view taken along the line IV-IV of the intake passage in FIG. 2. In FIG. 4, the broken position in FIG. 2 is indicated by line II-II, and the broken position in FIG. 3 is indicated by line III-III. 5 to 7 are sectional views of the intake passage, FIG. 5 is a sectional view taken along line VV in FIG. 2, FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG.

  In these drawings, the reference numeral 1 indicates an automobile engine according to this embodiment. The engine 1 is a V-type 6-cylinder engine, and includes a first cylinder row 2 located on the left side in FIG. 1 and a second cylinder row 3 located on the right side in FIG. In this specification, as shown in FIG. 1, the engine 1 is viewed from the axial direction of the crankshaft 4 and is adjacent to the other cylinder row of the left and right sides of each of the cylinder rows 2 and 3. One is called the inside of the V bank, and the other is called the outside of the V bank. Since these cylinder rows 2 and 3 have the same configuration, the first cylinder row 2 will be described in detail below, and the description of each member of the second cylinder row 3 will be the same. I will omit it.

  As shown in FIG. 1, the first cylinder row 2 and the second cylinder row 3 include a cylinder body 6 projecting from a cylinder block 5 shared by both cylinder rows 2 and 3, and the cylinder body 6. The cylinder head 7 is mounted on the top, and the cam housing 8 and the head cover 9 are mounted on the cylinder head 7. Three cylinder holes 10 are formed in the cylinder body 6 so as to be aligned in the axial direction of the crankshaft 4. In FIG. 1, reference numeral 11 denotes a piston fitted in the cylinder hole 10.

  The cylinder head 7 is formed with an intake port 12 and an exhaust port 13 which will be described later, an intake valve 14 and an exhaust valve 15 for opening and closing these ports 12, 13, and these intake / exhaust valves 14, 15 is provided with a valve operating device 16 for driving 15, an in-cylinder injector 17 and an intake passage injector 18, and a downstream partition plate 22 that constitutes a part of the intake control device 21 according to the present invention.

  Two intake valves 14 and two exhaust valves 15 are provided in each cylinder head 7 for each cylinder. The valve operating device 16 is configured to drive the intake valve 14 and the exhaust valve 15 by an intake cam shaft 23, an exhaust cam shaft 24, and a rocker arm 25 for each cam shaft.

  The intake port 12 constitutes a part of the intake passage referred to in the present invention, and is formed inside the V bank of the cylinder head 7. As shown in FIGS. 4, 6, and 7, the downstream end of the intake port 12 is branched into a first branch port 27 and a second branch port 28 that are separated from each other by a partition wall 26. It is formed in a shape. The first branch port 27 and the second branch port 28 are opened and closed by the two intake valves 14 and 14.

  As shown in FIG. 2, the downstream ends of the first branch port 27 and the second branch port 28 are opened to a portion that becomes the upper wall 32 of the combustion chamber 31 in the cylinder head 7. As shown in FIG. 1, the intake port 12 according to this embodiment is formed so as to linearly extend obliquely upward from the opening at the downstream end with respect to the cylinder axis CL.

  The upstream portion of the intake port 12 is formed in an intake pipe connecting portion 33 provided at the end inside the V bank in the cylinder head 7 so as to protrude toward the other cylinder row. The upper end of the intake pipe connecting portion 33 is formed to be a substantially horizontal flat surface, and an intake manifold 34 (see FIG. 1) to be described later is attached.

  As shown in FIGS. 1 and 2, the downstream side partition plate 22 is provided in the intake port 12. The downstream partition plate 22 constitutes the partition plate referred to in the present invention together with an upstream partition plate 35 on the intake manifold 34 side described later. The downstream partition plate 22 is formed separately from the cylinder head 7 by an aluminum alloy, and is equipped to partition the intake port 12 into an upper intake passage 36 and a lower intake passage 37. . As shown in FIG. 5, the downstream partition plate 22 according to this embodiment is positioned at a substantially central portion in the vertical direction of the intake port 12 when the inside of the intake port 12 is viewed from the upstream side.

  The downstream partition plate 22 is supported by connecting both side portions (both sides in the left-right direction in FIG. 5) of the downstream partition plate 22 to guide grooves 38 (see FIGS. 4 and 5) formed on the inner wall surface of the intake port 12. It is done by fitting. The guide groove 38 is formed so as to extend from the opening at the upstream end portion of the intake port 12 (the upper end of the intake pipe connecting portion 33) to the vicinity of the upstream side of the partition wall 26 in the direction of intake air flow. That is, the downstream partition plate 22 is inserted into the guide groove 38 from the upstream side of the intake port 12 and inserted to the vicinity of the upstream side of the partition wall 26, and is parallel to the intake port 12 when viewed from the axial direction of the crankshaft 4. So that it is held. In this embodiment, as shown in FIG. 4, the downstream partition plate 22 is formed to a length that is separated from the partition wall 26 by a length D upstream.

  Further, as shown in FIG. 2, the downstream partition plate 22 has an extension line L extending from the downstream partition plate 22 toward the combustion chamber 31 when viewed from the axial direction of the crankshaft 4. It inclines so that it may pass between the valve face center C (center of the lower surface of the valve body 14a) in 14a and the edge A located in the center side of the combustion chamber 31 in the lower surface of the said valve body 14a.

The intake passage injector 18 is provided above the intake port 12 thus configured, and the in-cylinder injector 17 is provided below the intake port 12.
The intake passage injector 18 is attached to a portion between the portion where the intake manifold 34 is attached at the upper end portion of the intake pipe connecting portion 33 and the upper end portion (the cam housing 8) of the cylinder head 7. In other words, the intake passage injector 18 is positioned in a space S <b> 1 sandwiched between the upper end portion of the cylinder head 7 and the intake manifold 34.

  As shown in FIGS. 2 and 4, the intake passage injector 18 injects fuel F into an injector connection portion 39 formed so as to bulge the upper wall portion of the intake port 12 upward. It is configured. The intake passage injector 18 injects fuel F from the injector connection portion 39 into the first branch port 27 and the second branch port 28, respectively. The intake passage injector 18 according to this embodiment mainly supplies fuel when the operating range of the engine 1 is low and in the medium speed operating range.

  The in-cylinder injector 17 is attached to the lower end of the cylinder head 7 and the end inside the V bank. In other words, the in-cylinder injector 17 is provided in an inner space S2 sandwiched between the intake port 12 of the first cylinder row 2 and the intake port 12 of the second cylinder row 3. In this embodiment, the in-cylinder injector 17 is positioned below the intake port 12 as viewed in the axial direction of the crankshaft 4 and substantially the same as the intake port 12, as shown in FIGS. It is attached to the cylinder head 7 so as to extend in parallel. Further, as shown in FIGS. 3 and 7, the in-cylinder injector 17 is positioned near the lower side of the partition wall 26 that partitions the first branch port 27 and the second branch port 28.

The fuel injection portion 17a of the in-cylinder injector 17 is located between the openings 27a and 28a at the downstream ends of the first branch port 27 and the second branch port 28, as shown in FIGS. In this manner, the fuel injection hole 40 is formed in the upper wall 32 of the combustion chamber 31.
The in-cylinder injector 17 mainly supplies fuel when the operating range of the engine 1 is in a high rotation / high load operating range. The in-cylinder injector 17 has an injection timing set so as to inject fuel during the intake stroke.

  The exhaust port 13 is positioned outside the V bank of the cylinder head 7 and is formed in a bifurcated shape like the intake port 12. An exhaust device (not shown) is connected to the exhaust outlet of the exhaust port 13.

  As shown in FIG. 1, the intake manifold 34 is detachably attached to an auxiliary intake manifold 41 (hereinafter simply referred to as an auxiliary intake manifold) mounted and fixed to the intake pipe connecting portion 33 and an upper end portion of the auxiliary intake manifold 41. And a main intake manifold 42 (hereinafter, simply referred to as a main intake manifold). In the following description, the intake manifold 34 side is simply referred to as the intake manifold side.

  The auxiliary intake manifold 41 is formed into a predetermined shape by casting using an aluminum alloy as a material. As shown in FIG. 1, the intake manifold side of each cylinder connected to the intake port 12 of the first cylinder row 2 is connected to one side portion. An intake passage 43 is formed, and an intake manifold side intake passage 44 for each cylinder connected to the intake port 12 of the second cylinder row 3 is formed on the other side. The intake manifold side intake passages 43 and 44 formed in the auxiliary intake manifold 41 and the intake port 12 constitute an intake passage extending obliquely upward from the combustion chamber in the present invention. The intake manifold side intake passages 43 and 44 are formed in a shape that extends the intake port 12 obliquely upward.

Inside the auxiliary intake manifold 41, an upstream side partition plate 35 that constitutes a partition plate according to the present invention is provided together with the downstream side partition plate 22 in the intake port 12, and a tumble control valve 45 is also provided. .
The upstream partition plate 35 is formed separately from the auxiliary intake manifold 41 by an aluminum alloy, and extends the downstream partition plate 22 obliquely upward as seen from the axial direction of the crankshaft 4 as shown in FIG. In such a position, it is provided so as to have the same inclination angle as that of the downstream side partition plate 22.

  The support of the upstream partition plate 35 is supported by the auxiliary intake manifold 41 by the same support structure as the support structure of the downstream partition plate 22. That is, the upstream partition plate 35 is held by the sub-intake manifold 41 by fitting both sides thereof into guide grooves 46 (see FIG. 4) formed in the inner wall of the intake passage of the sub-intake manifold 41. The upstream partition plate 35 according to this embodiment partitions the intake manifold side intake passages 43 and 44 into an upper intake passage 47 and a lower intake passage 48 when viewed from the axial direction of the crankshaft 4. In the position.

  Further, the upstream partition plate 35 is formed so as to extend from the lower end of the sub-intake manifold 41 to a portion slightly above the central portion in the vertical direction of the sub-intake manifold 41. The lower end of the upstream partition plate 35 is in contact with the upper end of the downstream partition plate 22 in the entire width direction, and the upper intake passages 47 and 36 and the lower intake passage are connected to each other between the partition plates 22 and 35. 48 and 37 are formed so as not to communicate with each other.

  The tumble control valve 45 is a butterfly valve that opens and closes a part of the intake manifold side intake passages 43 and 44 in the auxiliary intake manifold 41, and is provided in the vicinity of the upstream side of the upstream partition plate 35 in the auxiliary intake manifold 41. The sub intake manifold 41 having the tumble control valve 45, the downstream partition plate 22 and the upstream partition plate 35 constitute the intake control device 21 referred to in the present invention.

The valve body 45a of the tumble control valve 45 is supported by a valve shaft 45b extending in the axial direction of the crankshaft 4, and has the same open position as that indicated by the solid line in FIG. It rotates between a closed position indicated by a two-dot chain line in the figure.
As shown in FIG. 4, the valve body 45 a is formed by a plate having a shape equivalent to the cross-sectional shape of the upper half of the intake manifold side intake passages 43 and 44. When the valve body 45a is rotated to the open position, the valve body 45a is parallel to the flow direction of the intake air, and closes the upstream end of the upper intake passage 47 by rotating to the closed position.

  The valve shaft 45b passes through the auxiliary intake manifold 41 in the axial direction of the crankshaft 4, and is shared with a tumble control valve 45 (not shown) for other adjacent cylinders. The valve shaft 45b is connected to a motor (not shown) and is rotated at a predetermined time. The tumble control valve 45 according to this embodiment is configured to be closed when the operating range of the engine 1 is in the low rotation / low load operating range and to be opened when in the other operating range.

An upper intake passage 47 and a lower intake passage 48 provided in the sub-intake manifold 41 are formed so that the tumble control valve 45 is positioned near the inlet.
Of the walls forming the vicinity of the inlet of the lower intake passage 48, the bottom wall 51 located on the opposite side of the upstream partition plate 35 is gradually upstream as shown in FIG. It inclines so that it may space apart from 35. The inclination angle α (see FIG. 2) of the bottom wall 51 with respect to the upstream partition plate 35 according to this embodiment is set to about 25 ° to 30 °. The upstream end of the inclined bottom wall 51 is connected to a linear portion 52 that extends downward from the upstream end portion of the sub-intake manifold 41 in parallel with the upstream partition plate 35.

As shown in FIG. 1, the main intake manifold 42 connected to the upstream end portion of the auxiliary intake manifold 41 includes a tubular portion 53 connected to the intake manifold side intake passages 43 and 44 of the auxiliary intake manifold 41, and the tubular portion 53. It is comprised from the surge tank 54 provided in the upstream edge part. The main intake manifold 42 according to this embodiment is formed to have a predetermined shape by welding and assembling three plastic divided bodies by vibration welding.
As shown in FIG. 1, the tubular portion 53 is formed so as to extend from the sub intake manifold 41 to above the second cylinder row 3. For this reason, the space S <b> 1 in which the intake passage injector 18 of the second cylinder row 3 is located is covered with the tubular portion 53 at the top.

  As shown in FIG. 1, the surge tank 54 is disposed above the head cover 9 of the second cylinder row 3, and air that extends toward the first cylinder row 2 at one end in the axial direction of the crankshaft 4. An inlet pipe 55 is provided. A tip portion of the air inlet pipe 55 is located above the first cylinder row 2, and a throttle valve 56 is provided at the tip portion.

The intake air that has passed through the throttle valve 56 flows into the combustion chamber 31 through the air inlet pipe 55, the surge tank 54, the tubular portion 53, the intake manifold side intake passages 43 and 44, and the intake port 12.
In the engine 1 equipped with the intake control device 21 configured as described above, intake air flows only into the lower intake passage 48 in the sub-intake manifold 41 when the tumble control valve 45 is closed. The lower intake passage 48 is inclined so that the bottom wall 51 near the inlet gradually moves away from the upstream partition plate 35 toward the upstream side, so that the inlet is wide and intake air easily flows in. .

  In addition, the direction of flow of the intake air flowing in the vicinity of the bottom wall 51 is changed by hitting the bottom wall 51, and flows toward the upstream partition plate 35 as indicated by an arrow in FIG. 2. At this time, the bottom wall 51 formed in the vicinity of the inlet of the lower intake passage 48 substantially functions as an air funnel, and the intake air smoothly flows into the intake port 12 from the sub-intake manifold 41.

For this reason, according to the intake air control device 21 according to this embodiment, the upstream side partition plate 35 and the downstream side partition plate 22 are provided in the intake passage in the intake port 12 and the sub-intake manifold 41. The flow rate coefficient of the intake air when the tumble control valve 45 is closed can be made larger than that of the conventional intake control device .

  As a result of the increase in the flow rate coefficient of the intake air, the intake control device 21 closes the tumble control valve 45 to close a large amount of intake air in the lower intake passage in the sub-intake manifold 41 and the intake port 12. Can flow along the partition plates 22 and 35 in the vicinity of the upstream partition plate 35 and the downstream partition plate 22.

  The intake air is concentrated and distributed in the vicinity of the upstream partition plate 35 and the downstream partition plate 22, that is, the central portion of the intake passage including the upper intake passages 36 and 47 and the lower intake passages 37 and 48. In a state where the air flows in a large amount, the air flows obliquely into the cylinder through the space between the intake ports 14 and the openings 27a and 28a (exit of the intake passage) at the downstream end of the intake port 12 when viewed from the axial direction of the crankshaft 4. The direction in which the intake air flows at this time is indicated by arrows in FIG.

  For this reason, according to the intake control device 21 according to this embodiment, it passes through the center of the combustion chamber 31 as viewed from the axial direction of the cylinder without using a rectifying member that moves in conjunction with the tumble control valve. Intake can be sent into the cylinder. Since the intake air flows into the cylinder in this way, the intake air is not directly blown to the end of the cylinder wall 10 on the cylinder head 7 side, so that the direction and flow velocity of the intake air can be as much as possible. Will be maintained for a long time. That is, according to the intake air control device of this embodiment, the intake air flows obliquely into the cylinder so as to gather near the axial center of the cylinder, so that effective tumble is generated in the cylinder.

  On the other hand, when the tumble control valve 45 is opened, the intake air flows into the intake passage 47 on the upper side of the auxiliary intake manifold 41, and the intake passages 36 and 47 on the upper side of the auxiliary intake manifold 41 and the intake port 12 and the lower intake passage. A large amount of intake air flows into both the cylinders 37 and 48 and a large output is obtained in the engine 1.

  Therefore, in the engine 1 equipped with the intake control device 21 according to this embodiment, by closing the tumble control valve 45, an effective tumble is generated, thereby improving the fuel consumption and purifying the exhaust gas. In addition, by opening the tumble control valve 45, high rotation and high output operation becomes possible.

  In the downstream partition plate 22 according to this embodiment, an extension line L extending the downstream partition plate 22 toward the combustion chamber 31 has a valve face center C of the intake valve 14 and a combustion chamber 31 on the lower surface of the valve body 14a. It inclines so that it may pass between the edge A located in the center side. For this reason, in the intake control device 21 adopting this configuration, the valve element 14a of the intake valve 14 out of the intake air flowing into the cylinder through the lower intake passages 37 and 48 with the tumble control valve 45 closed. As shown by an arrow in FIG. 2, the intake air that hits the air flows to the side opposite to the intake port 12 when viewed from the axial direction of the crankshaft 4. Therefore, it is possible to prevent the intake air from flowing in the direction in which the tumble is weakened by hitting the valve body 14a of the intake valve 14, so that the tumble can be generated more effectively.

  In the above-described embodiment, an example in which the “intake passage extending obliquely upward from the combustion chamber” referred to in the present invention is formed by the intake port 12 and the auxiliary intake manifold 41 is shown, but the present invention is limited to such a limitation. In other words, the intake passage may be constituted by the intake port 12 alone. In this case, the tumble control valve 45 is provided in the cylinder head 7.

  In the above-described embodiment, the example in which the in-cylinder injector 17 and the intake passage injector 18 are provided in one cylinder has been described. However, these injectors 17 and 18 may be provided with only one of them. .

1 is a front view of an engine equipped with an intake air control device according to the present invention. It is sectional drawing which expands and shows a principal part. It is sectional drawing which expands and shows the attachment part of a cylinder injection injector. FIG. 4 is a sectional view taken along line IV-IV of the intake passage in FIG. 2. It is the VV sectional view taken on the line in FIG. It is the VI-VI sectional view taken on the line in FIG. It is the VII-VII sectional view taken on the line in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 4 ... Crankshaft, 7 ... Cylinder head, 12 ... Intake port, 14 ... Intake valve, 17 ... In-cylinder injector, 18 ... Intake passage injector, 21 ... Intake control device, 22 ... Downstream partition plate , 34 ... intake manifold, 35 ... upstream partition plate, 36, 47 ... upper intake passage, 37, 48 ... lower intake passage, 41 ... auxiliary intake manifold, 45 ... tumble control valve, 51 ... bottom wall.

Claims (5)

A partition plate provided in an intake passage extending obliquely upward from the combustion chamber when viewed from the axial direction of the crankshaft, and partitioning the inside of the intake passage into an upper intake passage and a lower intake passage;
In an intake control device for an engine, which is provided near the upstream side of the partition plate in the intake passage, and includes a tumble control valve that opens and closes a part of the intake passage.
The tumble control valve is configured to open and close the intake passage above the partition plate,
Of the walls forming the vicinity of the inlet of the lower intake passage, the bottom wall located on the opposite side of the partition plate is gradually separated from the partition plate toward the upstream side , and the downstream extension line of the bottom wall Is formed to be inclined so as to intersect with the partition plate, and the bottom wall of the intake passage downstream of the inclined bottom wall is formed along the partition plate. apparatus. The intake control apparatus for an engine according to claim 1,
When viewed from the axial direction of the crankshaft, the partition plate has an extension line extending from the partition plate to the combustion chamber side at the center of the lower surface of the valve body of the intake valve and the center side of the combustion chamber at the lower surface of the valve body. An intake control device for an engine, wherein the intake control device is inclined so as to pass between the end edges. The engine intake control device according to claim 1 or 2, wherein an inclination angle of the inclined bottom wall with respect to the partition plate is set to about 25 ° to 30 °. apparatus. The engine intake device according to any one of claims 1 to 3, wherein an upstream end of the inclined bottom wall is connected to a linear portion extending in parallel with the partition plate. The intake control device for the engine. 5. The engine intake device according to claim 1, wherein an intake passage extending obliquely upward from the combustion chamber includes an intake passage in a sub-intake manifold attached to a cylinder head, and a cylinder It is composed of the intake port of the head,
The partition wall is configured by an upstream partition plate supported by the auxiliary intake manifold and a downstream partition plate supported by the cylinder head,
An engine intake control apparatus, wherein the tumble control valve is supported by the auxiliary intake manifold.

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