JP6670126B2 - Engine intake structure - Google Patents

Description

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

  2. Description of the Related Art Conventionally, as in an engine described in Patent Literature 1, a partition partitioning an intake passage into two passages (a first passage and a second passage) in order to generate a tumble (vertical vortex) flow in intake air flowing into a cylinder. Techniques for providing plates have been developed. When the intake air flow rate is low, the flow rate of intake air flowing into the combustion chamber from the second passage is increased by narrowing the opening of the first passage partitioned by the partition plate with a TGV (Tumble Generation Valve), and the tumble flow in the combustion chamber is reduced. To form

JP 2014-101774 A

  By the way, in the configuration described in Patent Literature 1, when the opening degree of the first passage is minimized by the TGV, a part of the intake air flowing toward the second passage side flows from the gap between the TGV and the partition plate to the first passage side. And the quality of the tumble flow was reduced.

  In view of such problems, an object of the present invention is to provide an intake structure of an engine capable of improving the quality of a tumble flow.

In order to solve the above-mentioned problems, a partition plate provided in an intake passage of an engine and dividing the intake passage into a first passage and a second passage, and a valve for adjusting an opening of the first passage are provided. The intake structure of the engine includes a valve body fixed to a shaft and integrally rotating with the shaft, and the valve body is a plate-shaped member that varies an opening degree of the first passage with rotation of the shaft. a main body portion, when the opening of the first passage and the minimum, curved in contact with the partition wall plate includes a deformable portion for closing the gap between the main body and the partition wall plate, and a deformable portion of the partition wall plate One of the partition plate-side contact portion that contacts and the valve body-side contact portion that contacts the partition plate in the deformed portion is provided with an adsorption portion that adsorbs to the other .

  The deformation portion may be formed separately from the main body, and may be fixed to one or both of the main body and the shaft.

  The attracting portion is a magnetic force portion that generates a magnetic force, and the other of the partition plate-side contact portion and the valve body-side contact portion may be a magnetic material.

  According to the present invention, it is possible to improve the quality of the tumble flow.

FIG. 2 is an explanatory diagram for explaining an intake structure of an engine. FIG. 4 is an explanatory diagram for explaining a TGV opening / closing operation. It is an explanatory view for explaining an effect of a deformation part.

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

  FIG. 1 is an explanatory diagram for describing an intake structure 1 of an engine. FIG. 1A shows a front view of a partition plate 3 arranged in the intake passage 2, and FIG. 1B shows I (b) -I (b) in FIG. 1A. 3 shows a line section.

  As shown in FIG. 1, an intake structure 1 of an engine includes an intake passage 2, a partition plate 3, and a TGV (Tumble Generation Valve) 4. The intake passage 2 is a flow passage communicating with the combustion chamber 5. In the intake passage 2, an intake port 6 opening to the combustion chamber 5 is opened and closed at a portion communicating with the combustion chamber 5 by an intake valve 7 shown in FIG. The intake air flowing into the intake passage 2 is guided from the intake port 6 into the combustion chamber 5 when the intake valve 7 is opened.

  The partition plate 3 has a plate-shaped main body 3a. Of the main body 3a, guide walls 3b are provided on both sides of the main body 3a in the width direction (vertical direction in FIG. 1A). The guide wall 3b is formed along a recess formed in the inner wall of the intake passage 2 (the intake port 6), and the partition wall plate 3 is fixed in the intake passage 2 by fitting the guide wall 3b into the recess. Is done.

  The partition plate 3 divides the intake passage 2 along the flow direction of intake air to form a first passage 2a and a second passage 2b. That is, the partition plate 3 divides the intake passage 2 into the first passage 2a and the second passage 2b. The TGV 4 is disposed upstream of the partition plate 3 in the intake passage 2 and opens and closes the first passage 2a.

  FIG. 2 is an explanatory diagram for explaining the opening / closing operation of the TGV 4, and the vicinity of the TGV 4 is extracted and shown in FIG. As shown in FIG. 2, the intake passage 2 is formed by an intake manifold 8, a support member 9, and an intake port 6 of a cylinder head 10.

  Specifically, one end 8a of the intake manifold 8 and one end 9a of the support member 9 are connected, and the flow path in the intake manifold 8 and the flow path in the support member 9 communicate. Furthermore, the other end 9b of the support member 9 and the cylinder head 10 are connected, and the flow path in the support member 9 and the intake port 6 of the cylinder head 10 communicate. Thus, the intake passage 2 is formed by the passage in the intake manifold 8, the passage in the support member 9, and the intake port 6.

  The partition plate 3 extends from the flow path in the support member 9 of the intake passage 2 to the inside of the intake port 6, and is arranged at a position lower than the center of the intake passage 2 in FIG. . Therefore, the upper first passage 2a partitioned by the partition plate 3 has a larger passage area than the lower second passage 2b.

  The TGV 4 includes a shaft 11 and a valve body 12. The shaft 11 has both ends inserted into the inner wall of the support member 9 and is connected to a motor device (not shown), and rotates by receiving the power of the motor device.

  The valve body 12 includes a plate-shaped main body 12a and a deformed part 12b. The main body 12a extends in the flow path in the support member 9 of the intake passage 2 in the depth direction in FIG. 2 (the vertical direction in FIG. 1A). Further, as shown in FIG. 2, the main body 12 a is disposed closer to the first passage 2 a than the partition plate 3. The main body 12a and the first passage 2a have substantially the same vertical length in FIG. 2B.

  The base body 12c of the deformed portion 12b is a leaf spring having a smaller thickness and a lower elastic modulus than the main body portion 3a of the partition plate 3 and the main body portion 12a of the valve body portion 12, and the left side in FIG. The left end is sandwiched between the shaft 11 and the main body 12a. The right end of the base 12c in FIG. 2A extends to the downstream side (the partition plate 3 side) of the intake passage 2 from the main body 12a.

  Then, a fastening member (not shown) such as a screw penetrates through the main body portion 12a and the deformed portion 12b (base 12c) of the valve body portion 12, and fastens the main body portion 12a and the deformed portion 12b to the shaft 11. Therefore, the valve body 12 rotates integrally with the shaft 11 around the axis of the shaft 11. As the valve body 12 rotates with the rotation of the shaft 11, the opening degree of the first passage 2a can be changed.

  In the state shown in FIG. 2A, the opening degree of the first passage 2a is maximum. In this case, the valve body 12 is in a positional relationship along the intake passage 2, and both the first passage 2a and the second passage 2b are open. Therefore, the intake air flowing from the upstream of the intake passage 2 to the TGV 4 passes through both the first passage 2a and the second passage 2b to the combustion chamber 5 with almost no obstruction of the flow by the valve body 12 of the TGV 4. .

  On the other hand, in the closed state shown in FIG. 2B, the opening degree of the first passage 2a is minimized, and the first passage 2a is closed by the valve body 12 of the TGV 4. When the engine load is small and the intake flow rate is small, the opening degree of the first passage 2a is narrowed, and most of the intake air is passed to the second passage 2b having a smaller passage width than the first passage 2a. In this way, in the intake structure 1 of the engine, the intake air having the increased flow velocity is caused to flow into the combustion chamber 5 to form a vertical vortex flow (tumble flow) in the combustion chamber 5 to realize rapid combustion of the fuel, thereby improving fuel efficiency and improving fuel efficiency. It is possible to improve combustion stability.

  The deforming portion 12b has a magnetic force portion (adsorbing portion) 12d that generates a magnetic force such as a magnet. The magnetic force portion 12d is fixed to a distal end portion 12e on the downstream side of the intake passage 2 in the base 12c.

  As shown in FIG. 2A, when the opening degree of the first passage 2 a is at the maximum, the magnetic force portion 12 d of the deformed portion 12 b is moved from the upper surface 3 c of the partition plate 3 on the first passage 2 a side. And is opposed to the upper surface 3c.

  Then, in the process of rotating the valve body portion 12 to reduce the opening degree of the first passage 2 a, the magnetic force portion 12 d of the deformed portion 12 b comes into contact with the upper surface 3 c of the partition plate 3. That is, the magnetic force portion 12d is a portion of the deformed portion 12b that comes into contact with the partition plate 3 (the valve body-side contact portion 12f).

  In addition, a portion of the upper surface 3c of the partition plate 3 that contacts the deformed portion 12b is referred to as a partition plate-side contact portion 3d. The partition plate-side contact portion 3d is made of a magnetic material (ferromagnetic material or paramagnetic material). Specifically, for example, the entire main body 3a of the partition plate 3 is made of magnetic stainless steel.

  As described above, since the base 12c of the deformed portion 12b is a leaf spring, after the magnetic force portion 12d (the valve body-side contact portion 12f) contacts the partition plate-side contact portion 3d of the partition plate 3, furthermore, When the valve body 12 rotates, the base 12c is elastically deformed.

  As a result, as shown in FIG. 2B, when the opening degree of the first passage 2a is at a minimum, the deformed portion 12b causes the magnetic force portion 12d to contact the partition plate 3, and the base 12c is curved. It will be. At this time, the base 12c of the deformed portion 12b closes a gap between the main body 3a of the partition plate 3 and the main body 12a of the valve body 12.

  FIG. 3 is an explanatory diagram for explaining the effect of the deformed portion 12b. FIG. 3A shows the relationship between the excess air ratio λ and the indicated fuel consumption rate ISFC, and FIG. And the relationship between the excess air ratio λ and the indicated mean effective pressure change rate CPi. Here, the indicated mean effective pressure fluctuation rate CPi is an index value indicating the magnitude of the combustion fluctuation of the engine, and the larger the value is, the larger the combustion fluctuation is. In addition, in FIG. 3, a broken line indicates a legend when the deformed portion 12b is provided, and a dashed line indicates a legend when the deformed portion 12b is not provided.

  As shown in FIG. 3A, as the excess fuel becomes leaner by increasing the excess air ratio λ, the indicated fuel consumption ratio ISFC improves, but when the excess air ratio λ exceeds a predetermined value, the indicated fuel consumption ratio ISFC increases. Turns to rise and fuel economy deteriorates. The minimum value of the indicated fuel consumption rate ISFC is smaller by providing the deformed portion 12b than when the deformed portion 12b is not provided. That is, it is understood that the provision of the deformed portion 12b improves the fuel efficiency under the lean combustion condition of the fuel.

  Also, as shown in FIG. 3B, as the excess air ratio λ is increased to make the fuel leaner, the indicated mean effective pressure fluctuation rate CPi increases and the combustion fluctuation increases. Under the combustion conditions with a large excess air ratio λ, the provision of the deformed portion 12b has a smaller indicated average effective pressure change rate CPi and improved combustion stability than the case where the deformed portion 12b is not provided. .

  When the deformation portion 12b is not provided, when the opening degree of the first passage 2a is minimized by the TGV 4 under the combustion condition in which the fuel is lean, a part of the intake air flowing toward the second passage 2b side is formed by the TGV 4 and the partition plate 3. When flowing into the first passage 2a through the gap, the quality of the tumble flow may be degraded. As a result, as shown in FIG. 3, fuel efficiency and combustion stability are reduced.

  In the present embodiment, by providing the deformed portion 12b, the gap between the TGV 4 and the partition plate 3 is closed, the leakage of the intake air to the first passage 2a is suppressed, and the quality of the tumble flow is improved. As a result, it is possible to improve fuel efficiency and combustion stability under combustion conditions in which flame propagation is difficult, such as when the fuel is lean or the EGR rate is high and the oxygen concentration is low.

  In addition, since the deformable portion 12b is configured to bend by elastically deforming by being in contact with the partition plate 3, even if there is a dimensional error in the shape and arrangement of the valve body portion 12 and the partition plate 3, the deformable portion 12b is not deformed. 3 can be reliably contacted, and the leakage of the intake air to the first passage 2a can be suppressed.

  In addition, since the valve body-side contact portion 12f is a ferromagnetic material and the partition plate-side contact portion 3d is a paramagnetic material, when the valve body-side contact portion 12f and the partition plate-side contact portion 3d are close to each other, the two are magnetized. Attract. As a result, it is possible to make it difficult to separate the valve body-side contact portion 12f and the partition plate-side contact portion 3d even when there is engine vibration or intake pressure fluctuation.

  As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such embodiments. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Is done.

  For example, in the above-described embodiment, the case where the deformed portion 12b is formed separately from the main body portion 12a of the valve body portion 12 has been described. However, a part of the main body 12a of the valve body 12 may function as the deformable part 12b. That is, the deformable portion 12b may be formed integrally with the main body 12a. However, when the deformed portion 12b is formed separately from the main body portion 12a of the valve body portion 12, the deformable portion 12b can be more easily elastically deformed than the main body portion 12a simply by changing the material of the deformed portion 12b. Becomes possible.

  Further, in the above-described embodiment, the case where the deformed portion 12b is fixed to the main body portion 12a of the valve body portion 12 and the shaft 11 has been described, but any one of the main body portion 12a and the shaft 11 of the valve body portion 12 is provided. It may be fixed.

  Further, in the above-described embodiment, the description has been given of the case where the magnetic force portion 12d is provided in the valve body side contact portion 12f of the deformed portion 12b and the attraction is made to act on the partition plate side contact portion 3d of the partition plate 3 to perform suction. The magnetic part is not an essential component. Further, a magnetic force portion may be provided in the partition plate-side contact portion 3d of the partition plate 3, and an attractive force may be applied to the valve body-side contact portion 12f of the deformed portion 12b to be attracted, or the valve body-side contact portion 12f and the partition plate may be attached. Magnetic force portions may be provided on both of the side contact portions 3d.

  Further, in the above-described embodiment, a case is described in which the magnetic force portion 12d (adsorption portion) is a ferromagnetic material, the partition plate-side contact portion 3d of the partition plate 3 is a paramagnetic material, and an attractive force by magnetic force acts. explained. However, the attraction unit may apply an attractive force other than the magnetic force. However, when the attraction portion is a ferromagnetic material and exerts an attractive force by magnetic force, it is possible to easily and inexpensively make it difficult to separate the valve body side contact portion 12f and the partition plate side contact portion 3d.

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

DESCRIPTION OF SYMBOLS 1 Intake structure 2 Intake passage 2a 1st passage 2b 2nd passage 3 Partition plate 3d Partition plate side contact part 4 TGV (valve)
11 Shaft 12 Valve body part 12a Body part 12b Deformation part 12d Magnetic force part (adsorption part)
12f Valve body side contact part

Claims (3)

An intake structure for an engine, comprising: a partition plate provided in an intake passage of the engine, dividing the intake passage into a first passage and a second passage; and a valve for adjusting an opening degree of the first passage.
The valve is
A valve body fixed to the shaft and integrally rotating with the shaft;
With
The valve body portion,
A plate-shaped main body that varies an opening degree of the first passage with rotation of the shaft;
When the opening degree of the first passage is minimized, a deforming portion that curves while contacting the partition plate and closes a gap between the main body and the partition plate;
Equipped with a,
One of the partition plate-side contact portion of the partition plate that contacts the deformed portion and the valve element-side contact portion of the deformed portion that contacts the partition plate is provided with an adsorption portion that adsorbs to the other. The intake structure of the engine.   The engine intake structure according to claim 1, wherein the deformable portion is formed separately from the main body, and is fixed to one or both of the main body and the shaft. The said adsorption part is a magnetic force part which produces a magnetic force, and the other of the said partition plate side contact part and the said valve body side contact part is a magnetic body, The Claim 1 or 2 characterized by the above-mentioned. Engine intake structure.

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