JP2017025746A - Engine intake structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it hard to disturb a flow of intake air.SOLUTION: In an engine intake structure, of an intake passage 6 formed in the inside of an intake manifold and a cylinder head, by a partition plate 4 fixed to the inside on the cylinder head, the intake passage is divided into a first passage 6a and a second passage 6b. The second passage is opened/closed by a TGV 5 provided on an upstream side in a flowing direction of intake air of the partition plate. The partition plate is provided on the upstream side in the flowing direction of the intake air, and is equipped with a projecting portion 4c projecting from the cylinder head to the inside of the intake manifold. A parallel surface 4e facing the first passage of the projecting portion extends along an opposite surface 2b opposite to the projecting portion of the intake manifold.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake structure for an engine including a partition plate that partitions an intake passage of the engine.

  Conventionally, as in the engines described in Patent Documents 1 to 3, in order to generate a tumble (vertical vortex) flow in the intake air flowing into the cylinder, there are two intake passages (first passage and second passage). A technique for providing a partition plate for partitioning has been developed. When the intake air flow rate is small, the second passage partitioned by the partition plate is closed with a TGV (Tumble Generation Valve) to increase the flow velocity of the intake air flowing from the first passage into the combustion chamber and form a tumble flow in the combustion chamber. .

JP 2002-70566 A JP 2007-327487 A JP 2008-25346 A

  Incidentally, the intake passage is formed in the intake manifold and the cylinder head. Since it is difficult to dispose the TGV in the cylinder head on the downstream side of the intake passage, the TGV is disposed in the intake manifold on the upstream side. At this time, if the TGV and the partition plate are separated from each other, even if the TGV is closed, the intake air flows into the second passage from the separated gap. Therefore, the partition plate is extended into the intake manifold, and the TGV A configuration in which the gap between the partition plates is reduced is conceivable.

  At this time, especially when the TGV closes the second passage, the first passage becomes narrower and the flow velocity of the intake air becomes faster. At this time, if the intake flow is disturbed, a tumble flow is difficult to be generated.

  Therefore, an object of the present invention is to provide an intake structure for an engine that hardly disturbs the flow of intake air.

  In order to solve the above-mentioned problems, among the intake passages formed in the intake manifold and the cylinder head, the intake passage is partitioned into a first passage and a second passage by a partition plate fixed inside the cylinder head. In the engine intake structure of the present invention, the second passage is opened and closed by an opening / closing valve provided upstream of the partition plate in the intake flow direction. The partition plate is provided upstream of the intake flow direction. And a projecting portion projecting from the cylinder head to the inside of the intake manifold, and a parallel surface facing the first passage of the projecting portion extends along a facing surface facing the projecting portion of the intake manifold. Features.

  Among the opening / closing valves, the maximum distance between the end portion located on the first passage side in the closed state with the opening on the second passage side being minimized and the inner wall surface of the intake manifold facing the end portion is parallel to the facing surface. It may be smaller than the separation distance.

  The protrusion may have a notch formed at both ends in the width direction of the partition plate.

  Among the opening / closing valves, both ends in the width direction of the end portion located on the first passage side in the closed state with the opening on the second passage side minimized are connected to the inner wall surface of the intake manifold facing the end portion in the closed state. A minimum portion that minimizes the distance may be formed.

  According to the present invention, it is possible to make it difficult to disturb the flow of intake air.

It is explanatory drawing for demonstrating the intake structure of an engine. It is explanatory drawing for demonstrating a partition plate and TGV. It is explanatory drawing for demonstrating the protrusion part of a partition plate.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an explanatory diagram for explaining an intake structure 1 of an engine. 1A shows a front view of the partition plate 4 disposed in the intake manifold side intake passage 2 and the head side intake passage 3, and FIG. 1B shows I (b) of FIG. 1A. Show arrows. However, in order to facilitate understanding, in FIG. 1B, the partition plate 4 and the TGV 5 (Tumble Generation Valve) are taken along the line I (b) -I (b) in FIG. Show.

  The engine intake structure 1 includes an intake manifold side intake passage 2, a head side intake passage 3, a partition plate 4, and a TGV 5. The intake manifold side intake passage 2 is a part of the intake manifold, and the head side intake passage 3 is a passage formed in the cylinder head of the engine. As shown in FIG. 1, the head side intake passage 3 is connected to the intake manifold side intake passage 2, and the intake manifold side intake passage 2 and the head side intake passage 3 communicate with each other. The intake manifold side intake passage 2 and the head side intake passage 3 constitute an intake passage 6.

  The head-side intake passage 3 communicates with two intake ports 3 a and 3 b formed in the combustion chamber 8. Each intake port 3a, 3b is opened and closed by an intake valve 7 shown in FIG. The intake air flowing into the head-side intake passage 3 from the intake manifold-side intake passage 2 is guided into the combustion chamber 8 from the intake ports 3a and 3b when the intake valve 7 is opened.

  The partition plate 4 has a plate-shaped main body 4a. Guide wall portions 4b are provided on both side portions of the main body portion 4a in the width direction of the main body portion 4a (the vertical direction in FIG. 1A). The guide wall portion 4b is formed along a recess formed in the inner wall of the head side intake passage 3, and when the guide wall portion 4b is inserted into the head side intake passage 3, the guide wall portion 4b is fitted into the recess. Thus, the partition plate 4 is fixed in the head side intake passage 3 in the cylinder head.

  In addition, the partition plate 4 is provided with a protruding portion 4c. The protrusion 4c is provided on the upstream side of the main body 4a of the partition plate 4 in the intake flow direction, and protrudes from the head side intake passage 3 (cylinder head) to the inside of the intake manifold side intake passage 2 (intake manifold). That is, the partition plate 4 extends from the intake manifold side intake passage 2 to the head side intake passage 3. As shown in FIG. 1 (b), the partition plate 4 is configured so that the intake passage 6 (part of the intake manifold-side intake passage 2 and part of the head-side intake passage 3) is replaced with the first passage 6a and the second passage 6b. And partition.

  As shown in FIG. 1 (b), the partition plate 4 is arranged in the intake passage 6 at a position where the partition plate 4 is disposed, and is biased downward in FIG. 1 (b). The lower first passage 6a divided by 4 is narrower than the upper second passage 6b.

  The TGV 5 is disposed in the intake manifold side intake passage 2 and opens and closes the second passage 6b. The opening / closing of the TGV 5 will be described with reference to FIGS. 1 (c) and 1 (d). FIG. 1C is an extraction diagram of a one-dot chain line portion in FIG. 1B, showing a state in which the TGV 5 is in a closed state, and FIG. 1D is a state in which the TGV 5 is in an open state. The extraction figure of the same part as FIG.1 (c) of a state is shown.

  The TGV 5 has a valve body 5a. As shown in FIGS. 1C and 1D, the valve body 5a has a generally flat plate shape, and a shaft 5b is fixed to the valve body 5a with a fastening member 5c. Both ends of the shaft 5b are pivotally supported by support holes provided in the inner wall of the intake manifold side intake passage 2, and are rotated by a motor (not shown). The valve body 5a rotates integrally with the shaft 5b, and the second passage 6b is opened and closed.

  In the closed state shown in FIG. 1C, the opening of the TGV 5 is minimized, and the second passage 6b is almost closed by the TGV 5. On the other hand, in FIG. 1C, the lower end portion of the TGV 5 has a gap with the inner wall surface 2a of the intake manifold side intake passage 2, and a hollow portion 5d (see FIG. 2) described later is formed. The intake air passes through the first passage 6a toward the combustion chamber 8 through the gap and the recess 5d.

  On the other hand, in the state shown in FIG. 1 (d), the opening degree of the TGV 5 is maximum, and both the first passage 6a and the second passage 6b are open. Therefore, the intake air that has flowed from the upstream of the intake passage 6 to the TGV 5 passes through both the first passage 6 a and the second passage 6 b toward the combustion chamber 8.

  In this way, the second passage 6b is opened and closed (the opening degree changes greatly) by moving the TGV 5. On the other hand, the opening degree of the 1st channel | path 6a does not change as much as the 2nd channel | path 6b (it is not opened and closed).

  When the engine load is small and the intake air flow rate is small, as shown in FIG. 1 (c), the opening of the TGV 5 is reduced, and most of the intake air is directed to the first passage 6a side where the flow passage width is narrower than the second passage 6b. Let it pass. Thus, in the intake structure 1 of the engine, intake air with an increased flow velocity is caused to flow into the combustion chamber 8 to form a vertical vortex flow (tumble flow) in the combustion chamber 8 to realize rapid combustion of the fuel, thereby improving fuel consumption. Improves combustion stability.

  FIG. 2 is an explanatory diagram for explaining the partition plate 4 and the TGV 5. 2A shows a perspective view of the engine intake structure 1 taken along line II (a) -II (a) of FIG. 1A, and FIG. 2B shows TGV5. FIG. 2 (a) shows an arrow II (b), and FIG. 2 (c) shows a partition plate 4 taken along the line II (c) in FIG. 2 (a). 2A, illustration of the shaft 5b and the fastening member 5c of the TGV 5 is omitted.

  The left direction in FIG. 2B is the same as the downward direction in FIG. That is, in FIG. 2B, the lower end 5e of the TGV 5 forms the internal intake manifold-side intake passage 2 of the intake manifold 9 when the TGV 5 is closed. It faces the lower inner wall surface 2a.

  The recess 5d described above is formed at the end 5e of the TGV 5. And the minimum part 5f is formed in the both ends of the edge part 5e of the width direction (FIG. 2B, left-right direction) of TGV5 on both sides of the hollow part 5d. The minimum part 5f protrudes with respect to the hollow part 5d, and is a part where the distance from the inner wall surface 2a is minimum when the TGV 5 is in a closed state.

  Further, as shown in FIG. 2C, the protruding portion 4c of the partition plate 4 has notches 4d at both ends in the width direction (vertical direction in FIG. 2C). By providing the notch 4d, when the partition plate 4 is fitted into the head side intake passage 3 of the cylinder head 10 and then the intake manifold 9 is mounted on the cylinder head 10, a protruding portion is formed in the intake manifold side intake passage 2. 4c can be easily inserted. That is, by providing the notch 4d in the protrusion 4c, interference between the protrusion 4c and the intake manifold 9 can be prevented when the intake manifold 9 is attached to the cylinder head 10.

  However, when the notch 4d is formed in the partition plate 4 for the above reason, when the TGV 5 is in the closed state, a part of the intake air that has passed through the gap between the end portion 5e of the TGV 5 and the inner wall surface 2a passes through the notch 4d. There is a risk of leakage to the second passage 6b side.

  Here, since the minimum portion 5f is provided at the end portion 5e of the TGV 5, the intake air flowing at both ends in the width direction of the TGV 5 is brought closer to the center side in the width direction by the minimum portion 5f. Therefore, it becomes easier for the intake air to flow in the width direction center side than the notch 4d, and the leakage of the intake air to the second passage 6b side is suppressed, and the intake air is easily guided to the first passage 6a.

  FIG. 3 is an explanatory diagram for explaining the protrusion 4c of the partition plate 4, and shows an extraction diagram similar to FIG. 1 (c). As shown in FIG. 3, the parallel surface 4 e facing the first passage 6 a among the protrusions 4 c of the partition plate 4 is formed on the protrusion 4 c among the inner wall surfaces 2 a of the intake manifold side intake passage 2 in the intake manifold 9. It extends along the opposing surface 2b. Here, the protrusion 4c is disposed so as to be approximately parallel to the facing surface 2b.

  In the first passage 6a, in particular, when the TGV 5 closes the second passage 6b, the flow path is narrowed and the flow velocity of the intake air is increased. At this time, if disturbance occurs in the flow of intake air, a tumble flow is hardly generated in the combustion chamber 8. Therefore, by extending the parallel surface 4e of the partition plate 4 along the opposing surface 2b, the flow passage cross-sectional area in the first passage 6a is kept substantially constant, and the disturbance of the flow of intake air is kept to a minimum. Can be efficiently guided to the combustion chamber 8. As a result, it becomes possible to easily form a tumble flow in the combustion chamber 8.

  Incidentally, the shaft 5b of the TGV 5 is fixed between the upper end and the lower end of the valve body 5a, not the upper end and the lower end in FIG. Therefore, compared with the case where the shaft 5b is fixed to the upper end or the lower end of the valve body 5a, the torque for rotating the valve body 5a can be suppressed. As a result, when the TGV 5 is closed in order to avoid interference, the valve body 5a and the partition plate 4 must be arranged apart in the left-right direction in FIG.

  If the valve body 5a and the partition plate 4 are separated from each other, the intake air may leak out from the gap to the second passage 6b side. Therefore, as shown in FIG. 3, in the closed state in which the opening on the second passage 6b side is minimized, the distance between the recess 5d and the inner wall surface 2a (that is, the maximum distance h between the end 5e and the inner wall surface 2a). Is slightly smaller than the separation distance H between the facing surface 2b and the parallel surface 4e.

  Therefore, the intake air is throttled to the maximum distance h smaller than the separation distance H by the TGV 5 and then travels toward the first passage 6a. Therefore, even if the flow of the intake air expands toward the second passage 6b, the intake air flows more than the partition plate 4. 3, it becomes easy to guide to the first passage 6a before spreading upward.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope described in the claims. Needless to say, the modified examples also belong to the technical scope of the present invention.

  In the above-described embodiment, the case where the maximum distance h between the end portion 5e of the TGV 5 and the inner wall surface 2a is smaller than the separation distance H between the facing surface 2b and the parallel surface 4e has been described, but the maximum distance h is the separation distance H. The above length may be sufficient.

  In the above-described embodiment, the case where the notch 4d is formed in the protruding portion 4c has been described, but the notch 4d is not an essential configuration.

  Moreover, although the case where the minimum part 5f was formed in the edge part 5e of TGV5 was demonstrated in embodiment mentioned above, the minimum part 5f is not an essential structure.

  INDUSTRIAL APPLICABILITY The present invention can be used for an intake structure of an engine including a partition plate that partitions an intake passage of the engine.

1 Engine intake structure 2 Air intake side intake passage (intake passage)
2a Inner wall surface 2b Opposing surface 3 Head side intake passage (intake passage)
4 Bulkhead plate 4c Projection 4d Notch 4e Parallel surface 5 TGV (Open / close valve)
5e End portion 5f Minimum portion 6 Intake passage 6a First passage 6b Second passage 9 Intake manifold 10 Cylinder head

Claims (4)

Of the intake passages formed inside the intake manifold and the cylinder head, the intake passage is partitioned into a first passage and a second passage by a partition plate fixed inside the cylinder head, and the second passage is An engine intake structure that is opened and closed by an on-off valve provided upstream of the partition plate in the flow direction of intake air,
The partition plate is
Provided on the upstream side in the flow direction of intake air, provided with a projecting portion projecting from the cylinder head to the inside of the intake manifold,
The engine intake structure according to claim 1, wherein a parallel surface facing the first passage of the projecting portion extends along a surface facing the projecting portion of the intake manifold.   Among the on-off valves, the maximum distance between the end portion located on the first passage side in the closed state with the opening on the second passage side being the minimum and the inner wall surface of the intake manifold facing the end portion is: The engine intake structure according to claim 1, wherein the intake structure is smaller than a separation distance between the facing surface and the parallel surface.   The intake structure for an engine according to claim 1, wherein the protruding portion has a notch formed at both ends in the width direction of the partition plate.   Among the opening / closing valves, both ends in the width direction of the end portion located on the first passage side in the closed state with the opening on the second passage side being minimized are opposed to the end portion in the closed state. 4. An intake structure for an engine according to claim 3, wherein a minimum portion having a minimum distance from the inner wall surface of the intake manifold is formed.

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