JP2009002218A - Intake system of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake system of an internal combustion engine capable of certainly making an intake flow by an intake flow control valve into a tumble flow. <P>SOLUTION: The intake system is equipped with a rotary shaft 7, provided at a downstream side of a flexure inside an intake passage 3 so as to traverse a flow path of intake air, in the intake passage 3 which has the flexure curved against a horizontal direction and is coupled to an intake port 1a of a cylinder head 1 and further is provided in an intake manifold. Besides, the intake system is provided with the intake flow control valve 5 which turns depending on an operative condition to control an intake flow supplied to the intake port 1a and is also provided with, at a position opposite to the intake flow control valve 5 which is disposed at an upstream side of the intake flow control valve 5 and at a totally-closing position thereof, and a current plate 9 whose rectifying surface is perpendicular to the rotary shaft 7 and is provided along the flow path of the intake air in an extending manner and whose downstream end is disposed at a given distance from the intake flow control valve. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an intake device for an internal combustion engine.

  2. Description of the Related Art Conventionally, in an intake device that supplies air or an air-fuel mixture to an internal combustion engine such as an automobile engine, the internal combustion engine is disposed inside an intake manifold connected to an intake port of a cylinder head in order to improve fuel efficiency at low load. There is known a valve provided with a valve (hereinafter referred to as an intake flow control valve) that opens and closes according to the operating conditions. In such an intake device, when the load is low, the intake flow control valve is closed to narrow the intake passage cross-sectional area, and the flow rate of the intake air supplied to the intake port is increased, thereby improving the combustion efficiency of the fuel.

  Further, Patent Document 1 includes an intake flow control valve in the vicinity of a connection portion with an intake port of an intake manifold having a curved portion, and intake air flows into the intake flow control valve when the intake flow control valve is in a fully opened position. In order to prevent the intake resistance from increasing due to a collision, it is curved along the curved portion of the intake manifold and is arranged so that the downstream end is continuous with the intake flow control valve when the intake flow control valve is in the fully open position. An air intake device including a straightening plate is disclosed.

No. 7-7549

  For example, in the case of an intake device configured to generate a tumble flow in a combustion chamber provided below the cylinder head and improve fuel combustion efficiency, the intake flow control valve lowers the flow path in the intake manifold when the load is low It is possible to enhance the tumble at the time of low load by closing the side so that intake air is supplied only from the upper side of the flow path.

  However, when the load is low, if the intake valve that opens and closes the opening on the combustion chamber side of the intake port is opened, a gas flow from the cylinder toward the intake manifold, that is, a reverse flow occurs. When the load is low, the intake flow control valve is in the fully closed position, so that the gas that has flowed backward passes through the flow path narrowed by the intake flow control valve on the upstream side of the intake flow control valve, thereby forming a spiral flow.

  When the intake manifold is curved upstream of the intake flow control valve and in the vicinity of the intake flow control valve, the vortex formed upstream of the intake flow control valve collides with the inner wall surface of the curved portion of the intake manifold. By doing so, the flow may change, and the balance of the intake air supplied from the intake manifold into the cylinder may be lost.

  In particular, in an intake device configured to generate a tumble flow, if the intake air in the intake manifold is disturbed, the intake air supplied into the cylinder does not become an effective tumble flow, and further, depending on the shape of the intake manifold The intake air supplied to a plurality of cylinders becomes uneven, and the intake air becomes a swirl flow and the in-cylinder flow is not sufficiently strengthened, which may adversely affect fuel consumption and exhaust gas.

  As described above, in the conventional intake device for an internal combustion engine, when an intake flow control valve is provided to generate a tumble flow in the cylinder, a desired turbulence strength such as a swirl flow is generated in the cylinder. There was a risk of not being able to. Such a problem of the intake flow generation mechanism can also occur in the intake device disclosed in Patent Document 1.

  In view of the above, an object of the present invention is to provide an intake device for an internal combustion engine that can reliably make the intake flow by the intake flow control valve a tumble flow.

  An intake device for an internal combustion engine according to a first aspect of the present invention for solving the above problems includes an intake manifold having a curved portion with respect to a horizontal direction and connected to an intake port of a cylinder head, and the intake manifold in the intake manifold. An intake flow control valve that includes a rotary shaft provided so as to cross the flow path of the intake air on the downstream side of the curved portion, and that rotates according to operating conditions to control the intake air flow supplied to the intake port; A rectifying surface is orthogonal to the rotation axis and extends along the intake air flow path at a position on the upstream side of the flow control valve and facing the intake flow control valve in the fully closed position, and the downstream end is A rectifying plate having a predetermined interval is provided between the intake flow control valve and the intake flow control valve.

  With such a configuration, even when the gas flows backward from the cylinder to the intake manifold as the intake valve opens and closes at low load, the gas flowing backward by the rectifying plate crosses the flow path. Since the bias can be prevented, a tumble flow can be reliably generated in the cylinder.

  According to a second aspect of the present invention, there is provided an intake device for an internal combustion engine according to the first aspect, wherein the height from the base end to the front end of the rectifying plate is set to the intake flow control when the intake flow control valve is in a fully closed position. The height is equivalent to the valve upper end.

  If the height of the rectifying plate is too higher than the height of the upper end of the intake flow control valve in the fully closed position, the intake flow is likely to be blocked, and conversely, the height of the upper end of the intake flow control valve in the fully closed position is too low. The rectifying effect may be diminished. Therefore, it is preferable that the height is equivalent.

  An intake device for an internal combustion engine according to a third aspect of the present invention is the first or second aspect of the present invention, wherein the length of the rectifying plate in the direction along the intake air flow path is such that at least the upstream end of the rectifying plate is the curved portion. It is characterized by having a length located on the upstream side as compared with the upstream end.

  Such a configuration efficiently rectifies a gas flow that tends to be biased in the direction crossing the flow path of the intake flow among the backflowing gas flow without obstructing the intake flow, and reliably in the cylinder. A tumble flow can be generated.

  An intake device for an internal combustion engine according to a fourth aspect of the present invention is the first, second or third aspect, wherein the plurality of rectifying plates are arranged at equal intervals along the axial direction of the rotating shaft. It is characterized by that.

  With this configuration, the gas flowing backward from the cylinder to the intake manifold can be evenly distributed with respect to the axial direction of the rotation axis of the intake flow control valve, so that intake air is not biased and is reliably generated in the cylinder. It is possible to generate a tumble flow.

  An internal combustion engine intake device according to a fifth aspect of the present invention is the first, second or third aspect of the present invention, wherein there are a plurality of the rectifying plates and a reverse flow from the intake port side along the axial direction of the rotating shaft. It is characterized by being arranged at unequal intervals so that the distance between the current plates increases from the side wall of the curved portion where the gas collides to the side wall on the opposite side.

  With such a configuration, the gas flow that flows back from the cylinder to the intake manifold can be efficiently rectified in the portion where the vortex tends to form, so that the intake air in the intake manifold is not biased and Thus, a tumble flow can be generated reliably.

  An intake device for an internal combustion engine according to a sixth aspect of the present invention is the first, second or third aspect of the present invention, wherein the rectifying plate is one and is formed in a flat plate shape and flows backward from the intake port side. It is arranged on the side wall side of the curved portion where the impact occurs.

  With such a configuration, it is possible to reliably suppress the bias of intake air with a simple configuration in which only one rectifying plate is provided, so that a tumble flow can be generated in the cylinder.

  According to the above-described intake device for an internal combustion engine according to the present invention, even when the gas flows backward from the cylinder to the intake manifold, there is no possibility that the intake flow is biased by the flow of the flowing gas, and the intake apparatus reliably A tumble flow can be generated.

  Embodiments of the present invention will be described with reference to the following examples.

  The first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1A is a top view showing a part of an intake device for an internal combustion engine according to the present embodiment, partially broken away. FIG. 1B is a partial view of the intake device for the internal combustion engine according to the present embodiment. Fig. 2 is a partially enlarged view of Fig. 1 (a), Fig. 3 is a partially enlarged view of Fig. 1 (b), and Fig. 4 (a) is an explanatory view showing the flow of intake air in this embodiment. FIG. 4B is an explanatory view showing the flow of conventional intake air, and FIG. 5 is a top view showing another example of the intake device for the internal combustion engine according to the present embodiment, partially broken away.

  As shown in FIG. 1, the intake device according to the present embodiment introduces a plurality of intake passages having one end connected to the cylinder head 1 and the other end connected to the carburetor 2 (intake air for each cylinder of the cylinder head 1). And an intake manifold having a passage. Hereinafter, in this embodiment, description will be made focusing on the two intake passages 3 and 4 (hereinafter referred to as the first passage and the second passage) shown in FIG.

  The distance between the connection portions of the two passages 3 and 4 with the cylinder head 1 is larger than the distance between the connection portions with the vaporizer 2 and the second passage 4 has a linear shape with respect to the horizontal direction. On the other hand, the first passage 3 has a curved shape with respect to the horizontal direction.

  Inlet flow control valves 5 and 6 are provided in the vicinity of the connection portion between the first passage 3 and the second passage 4 with the cylinder head 1, respectively. The intake flow control valves 5 and 6 are respectively provided with rotating shafts 7 and 8 and configured to be rotatable. Further, a portion (4 in the present embodiment) arranged along the axial direction of the rotary shaft 7 is located on the upstream side of the intake flow control valve 5 in the first passage 3 and corresponding to the curved portion of the first passage 3. The rectifying plate 9 is fixed.

  As shown in FIG. 1 (b), the intake flow control valve 5 is operated between a position indicated by a solid line in the figure (hereinafter, fully closed position) and a position indicated by a one-dot chain line in the figure (hereinafter, fully open position). It is designed to rotate according to Specifically, one end of the first passage 3 is connected to an intake port 1 a formed in the cylinder head 1, and the intake passage control valve 5 adjusts the flow passage area of the intake air in the first passage 3. Thus, the intake flow supplied from the first passage 3 to the intake port 1a can be controlled. An intake valve 11 for opening and closing the opening is provided at the opening on the combustion chamber 10 side of the intake port 1a. Reference numeral 12 shown in FIG. 1 is a cylinder block.

  Although not shown, the second passage 4 is similarly connected at one end to an intake port corresponding to the second passage 4 formed in the cylinder head 1, and the intake flow control valve 6 is connected via the rotating shaft 8. And the intake passage supplied to the intake port can be controlled by adjusting the flow passage cross-sectional area of the second passage 4.

  As shown in FIGS. 2 and 3, the rectifying plate 9 is formed by arranging plate-like members having a substantially constant thickness t so that the rectifying surface is substantially orthogonal to the axial direction of the rotating shaft 7. When the intake flow control valve 5 is in the fully closed position, it is fixed to the bottom surface 3a of the first passage 3 facing the tip of the intake flow control valve 5 by welding or bonding. Each of the rectifying plates 9 is curved along the curvature of the first passage 3.

  Further, in the rectifying plate 9, the length h in the direction parallel to the cross section of the intake flow path and perpendicular to the axial direction of the rotary shaft 7 is substantially the same as the height of the intake flow control valve 5, and The length L in the along direction is a length narrowed by the intake flow control valve 5 in the fully closed position, for example, the upstream end of the rectifying plate 9 is positioned upstream of the curved portion of the first passage 3. It is set to a length sufficient for the gas flowing back into the first passage 3 to diffuse into the entire flow passage section of the first passage 3. The plate thickness t of the rectifying plate 9 is set as thin as possible within a range in which the strength can be maintained. The position of the downstream end of the rectifying plate 9 is set so as to have a minute interval g as a predetermined interval between the intake flow control valve 5 and the intake flow control valve 5 when the intake flow control valve 5 is in the fully open position. .

  The four rectifying plates 9 are equally spaced along the axial direction of the rotary shaft 7, that is, the rectifying plates 9 located at both ends of the four rectifying plates 9 and the rectifying plates 9 facing the rectifying plates 9. The distance between the inner side walls 3b or 3c of the one passage 3 and the distance between the rectifying plates 9 adjacent to each other are all set to a constant distance.

  According to the intake device for an internal combustion engine according to the present embodiment, the gas flows backward from the cylinder into the first passage 3 as shown by the one-dot chain line in FIG. Even in the case where the flow shown in part A in FIG. 3 collides with the inner wall 3b, the flow of the gas whose direction of travel has changed is rectified as shown in part B in FIG. Since it can be rectified by the plate 9, no vortex is formed by the backflowed gas, and the intake flow is prevented from being biased with respect to the axial direction of the rotating shaft 7, as shown in FIG. In addition, the intake air supplied to the plurality of cylinders 13a and 13b becomes uniform, and the intake air can be reliably made into a tumble flow. On the other hand, when the rectifying plate is not provided, the intake air supplied to the plurality of cylinders 13a and 13b becomes uneven as shown in FIG. 4B, and there is a possibility that the intake air becomes a swirl flow.

  Note that the current plate is provided at least in the intake passage of the intake manifold curved in the horizontal direction.

  Further, in the present embodiment described above, an example in which a rectifying plate is provided on the upstream side of the intake flow control valve 5 only for the first passage 3 is shown, but in addition to the first passage 3 as shown in FIG. You may make it provide the baffle plate 14 also in the 2nd channel | path 4. FIG. Further, the number of current plates is not limited to four, and may be set according to the width and shape of the intake manifold. However, the number of rectifying plates is set such that the intake resistance can be suppressed when the intake flow control valve is moved to the fully open position.

  Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a top view showing the intake manifold of the intake manifold according to the present embodiment with a part broken away. The present embodiment is an example in which two rectifying plates 109 shown in FIG. 6 are used instead of the four rectifying plates 9 of the first embodiment. Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  As shown in FIG. 6, in the present embodiment, the first passage 3 is disposed on the upstream side of the intake flow control valve 5 and in the curved portion of the first passage 3 along the axial direction of the rotary shaft 7. Two rectifying plates 109 are provided. The rectifying plate 109 is formed by arranging a plate-like member having a substantially constant thickness so that the surface direction is substantially perpendicular to the axial direction of the rotary shaft 7, and the intake flow control valve 5 is in the fully closed position. At some time, it is disposed along the axial direction of the rotary shaft 7 on the bottom surface 3a of the first passage 3 facing the tip of the intake flow control valve 5, and is fixed by welding or adhesion.

  The rectifying plate 109 is parallel to the cross section of the intake flow path, and the height in the direction orthogonal to the axial direction of the rotary shaft 7 is substantially the same as the height of the intake flow control valve 5. The length in the direction along the passage is such that the upstream end of the rectifying plate 109 is positioned upstream of the curved portion of the first passage 3, and the passage is narrowed by the intake flow control valve 5 in the fully closed position. Thus, the gas is set to a length sufficient for the gas flowing back into the first passage 3 to diffuse over the entire flow path cross section of the first passage 3. In addition, the plate thickness of the rectifying plate 109 is set as thin as possible within a range in which the strength can be maintained. Further, the downstream end of the rectifying plate 109 is disposed so as to have a minute gap between the intake flow control valve 5 and the intake flow control valve 5 when the intake flow control valve 5 is in the fully open position.

In this embodiment, the distances d ₁ and d ₃ between the two rectifying plates 109 and the inner side walls 3a and 3c of the first passage 3 facing the rectifying plates 109, and the distance d between the rectifying plates 109 adjacent to each other. ₂ are arranged so as to have different distances, specifically d ₁ <d ₂ <d ₃ . Each of these two rectifying plates 109 is curved along the curvature of the first passage 3.

  According to the intake device for an internal combustion engine according to the present embodiment, the inner wall 3b side where the gas flowing backward from the cylinder into the first passage 3 collides is larger than the inner wall 3c side where the backward gas does not collide. By providing the current plate, the gas flowing back into the first passage 3 can be efficiently rectified. In addition to the effect of the first embodiment, the work of fixing the current plate 109 can be simplified. While being possible, the effect that the bias of the intake flow can be prevented is obtained.

  Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a top view showing the intake passage of the intake manifold according to the present embodiment with a part thereof broken. The present embodiment is an example in which one rectifying plate 209 is used instead of the four rectifying plates 9 of the first embodiment. Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  As shown in FIG. 7, in the present embodiment, one rectifying plate 209 is provided on the upstream side of the intake passage control valve 5 of the first passage 3 and on the curved portion of the first passage 3. The rectifying plate 209 has a substantially constant thickness and is formed by arranging a plate-shaped member so that the rectifying surface is substantially orthogonal to the axial direction of the rotating shaft 7. Is fixed to the bottom surface 3a of the first passage 3 facing the tip of the intake flow control valve 5 by welding or bonding or the like.

  The rectifying plate 209 is parallel to the cross section of the intake flow path, and the height in the direction perpendicular to the axial direction of the rotary shaft 7 is substantially the same as the height of the intake flow control valve 5, and is along the intake flow path. The length in the direction is long enough for the gas flowing back into the first passage 3 through the flow passage narrowed by closing the intake flow control valve 5 to diffuse throughout the flow passage cross section of the first passage 3. It has become. The plate thickness of the current plate 209 is set as thin as possible within a range in which the strength can be maintained. Further, the position of the end of the rectifying plate 209 on the cylinder head 1 side is set so that there is a minute gap between the intake flow control valve 5 and the intake flow control valve 5 when the intake flow control valve 5 is in the fully open position. .

  In this embodiment, the rectifying plate 209 is fixed at a position that is biased toward the inner wall 3 b curved in a convex shape of the first passage 3 with respect to the axial direction of the rotating shaft 7.

  According to the intake device for an internal combustion engine according to the present embodiment, compared with the first embodiment and the second embodiment described above, while simplifying the fixing operation of the rectifying plate, the intake manifold intake passage ( It is possible to prevent the intake air flow from being biased by the gas flowing back into the first passage 3).

  Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a side view showing a partially broken intake passage of the intake manifold according to the present embodiment. The present embodiment is an example in which an intake flow control valve 305 shown in FIG. 8 is used instead of the intake flow control valve 5 of the first embodiment. Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  As shown in FIG. 8, the intake flow control valve 305 includes a rotation shaft 307 provided so as to cross the flow path, and a position indicated by a solid line in the figure (hereinafter, a fully closed position) and a position indicated by a one-dot chain line in the figure. (Hereinafter, fully open position) is rotated according to the operating conditions. That is, the rotary shaft 307 is configured to rotate on the downstream side. Although not shown in the figure, the second passage 4 is similarly provided with an intake flow control valve that rotates on the downstream side with respect to the rotation shaft.

  Further, the rectifying plate 309 is shaped such that the shape of the upstream end is smoothly connected to the curved portion of the first passage 3. The rectifying plate 309 is substantially the same as the rectifying plate 9 described in the first embodiment except for the shape of the upstream end, and redundant description is omitted.

  According to the intake device for the internal combustion engine according to the present embodiment, the intake flow can be easily guided to the introduction path when the intake flow control valve 305 is in the fully closed position as compared with the first embodiment described above. Combustion efficiency can be further improved.

  In the present embodiment, the intake flow control valve 305 is provided with a rotating shaft 307 provided so as to cross the flow path, but instead of the intake flow control valve 305, as shown in FIG. Various modifications are possible, such as a configuration in which an intake flow control valve 405 that includes a rotation shaft 407 fixed to the bottom surface 3 a of the one passage 3 and rotates downstream from the rotation shaft 407 is used.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention, such as combining a plurality of embodiments.

  In the present embodiment, the case where the number of current plates is 1, 2, or 4 has been described, but other numbers may be used. The specific number can be set as appropriate according to the diameter of the intake passage of the intake manifold, taking into consideration that intake resistance does not become remarkably large when the intake flow control valve is opened.

  The present invention is an intake device that supplies intake air to an internal combustion engine such as an automobile engine, and is particularly suitable for application to an intake device that generates a tumble flow in a cylinder.

FIG. 1A is a top view showing a partially broken intake device for an internal combustion engine according to the first embodiment of the present invention, and FIG. 1B is a partial view of the intake device according to the first embodiment of the present invention. It is a side view shown fractured. It is the elements on larger scale of Fig.1 (a). It is the elements on larger scale of FIG.1 (b). 4A is an explanatory view showing the flow of intake air in Embodiment 1 of the present invention, and FIG. 4B is an explanatory view showing the flow of conventional intake air. FIG. 6 is a top view partially broken away showing another example of the intake device for an internal combustion engine according to the first embodiment of the present invention. It is a top view which partially fractures | ruptures and shows the intake device which concerns on Example 2 of this invention. It is a top view which partially fractures | ruptures and shows the intake device which concerns on Example 3 of this invention. It is a side view which shows the other intake device which concerns on this invention partially fractured | ruptured. It is a side view which shows the other intake device which concerns on this invention partially fractured | ruptured.

Explanation of symbols

Reference Signs List 1 cylinder head 1a intake port 2 carburetor 3, 4 (intake manifold) intake passage 3a bottom surface 3b, 3c inner wall 5, 6, 305, 405 intake flow control valve 7, 8 rotary shaft 9, 14, 109, 209, 309 Current plate 10 Combustion chamber 11 Intake valve

Claims (6)

An intake manifold having a curved portion with respect to the horizontal direction and connected to the intake port of the cylinder head;
An intake air flow having a rotating shaft provided so as to traverse the intake air flow path downstream of the curved portion in the intake manifold and controlling the intake air flow that rotates according to operating conditions and is supplied to the intake port A control valve;
On the upstream side of the intake flow control valve and at a position facing the intake flow control valve in the fully closed position, a rectifying surface is orthogonal to the rotation axis and extends along the intake flow path. And a rectifying plate having a predetermined interval between the intake flow control valve and the intake device of the internal combustion engine.   2. The internal combustion engine according to claim 1, wherein a height from a base end to a front end of the rectifying plate is set to a height equivalent to an upper end of the intake flow control valve when the intake flow control valve is in a fully closed position. Engine intake system.   The length of the rectifying plate in the direction along the intake air flow path is set such that at least the upstream end of the rectifying plate is positioned upstream of the upstream end of the curved portion. 3. An intake device for an internal combustion engine according to 1 or 2.   4. The intake device for an internal combustion engine according to claim 1, wherein a plurality of the rectifying plates are provided and arranged at equal intervals along an axial direction of the rotation shaft.   There are a plurality of rectifying plates, and the distance between the rectifying plates increases from the side wall of the curved portion where the gas flowing back from the intake port side collides along the axial direction of the rotating shaft toward the opposite side wall. 4. The intake device for an internal combustion engine according to claim 1, wherein the intake devices are arranged at unequal intervals so as to expand.   The said baffle plate is one, is formed in flat form, and is arrange | positioned at the side wall side of the said curved part which the gas which flows backward from the said intake port side collides, The said 1 or 2 characterized by the above-mentioned. 4. An intake device for an internal combustion engine according to 3.

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