JP2008309106A - Intake controller for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly open and close a valve element even if working accuracy of sliding surfaces of a first intake passage end part and valve element is rough, in an intake controller for an engine. <P>SOLUTION: In the intake controller for the engine, the sleeve type valve element 8 for moving between a close position A contacting with the other second intake passage end part 4a and an open position B apart from the second intake passage end part 4a is slidably fit to a first intake passage end part 3b of confronting end parts 3b, 4a of first and second intake passages 3, 4 and driving devices 21, 22, 23 for driving open/close of the valve body 8 are connected to the valve body 8. A guide boss 15 of which axis line is positioned above a center of gravity G of the valve element 8 in an opening and closing direction of the valve element 8 is formed for the valve element 8 and a guide post 10 for slidably fitting with the guide boss 15 and suspending and supporting the valve element 8 is fixed with an intake manifold. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides an intake manifold attached to an engine, a surge chamber connected to an air inlet, a first intake passage opening an upstream end portion and a downstream end portion in the surge chamber, and a downstream end portion of the first intake passage. The upstream end portion is opened to the surge chamber so as to face each other with a space therebetween, and the downstream end portion is formed with a second intake passage connected to the intake port of the engine, and the opposite end portions of the first and second intake passages are formed. A sleeve type valve element that moves between a closed position in contact with the other second intake passage end and an open position that is spaced apart from the second intake passage end is slidable at one first intake passage end. The present invention relates to an improvement in an intake control device for an engine, which is fitted and connected to a drive device for opening and closing the valve body.

Such an intake control device for an engine is already known as disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 7-224670

  In such an engine intake control device, the end of the first intake passage also serves as a guide member for guiding the opening / closing operation of the valve body. Therefore, in order to ensure the smooth opening / closing of the valve body, It is necessary to properly manage the moving gap and high machining accuracy is required. However, since the end of the first intake passage and the valve body have a large diameter, maintaining high machining accuracy on their sliding surfaces is a production. This reduces the performance and increases the cost.

  The present invention has been made in view of such circumstances, and the valve body can be smoothly opened and closed even if the processing accuracy of the first intake passage end and the sliding surface of the valve body is rough. An object of the present invention is to provide an intake control device for an engine.

  In order to achieve the above object, the present invention provides an intake manifold attached to an engine, a surge chamber connected to an air inlet, a first intake passage that opens an upstream end and a downstream end in the surge chamber, and a first intake passage. Forming an upstream end portion in the surge chamber so as to face the downstream end portion of the one intake passage with a space therebetween, and forming a second intake passage connecting the downstream end portion to the intake port of the engine; A sleeve type that moves between a closed position in contact with the other second intake path end and an open position spaced from the second intake path end at one first intake path end of the opposite end of the second intake path In an engine intake control device in which a valve body is slidably fitted and a drive device for opening and closing the valve body is connected to the valve body, the valve body is located above the center of gravity of the valve body. A guide boss with an axis in the opening and closing direction is formed. Slidably fitted in the first, characterized in that the support guides strike suspended the valve body and fixed to the intake manifold to Idobosu. The driving device corresponds to a lever shaft 21, an operating lever 22 and an actuator 23 in an embodiment of the present invention to be described later.

  In addition to the first feature, the present invention has a second feature in that a seal member that is in close contact with the outer peripheral surface of the first intake passage end is attached to the inner periphery of the plate body.

  According to the first feature of the present invention, the guide boss and the guide post can be made sufficiently smaller in diameter than the end of the first intake passage and the valve body. They can be easily machined, so that their sliding gaps can be properly and easily managed, while the machining accuracy of the first intake passage end and the sliding surface of the valve body can be made rough. Therefore, not only can the cost be reduced by improving the productivity, but also the opening / closing driving force of the valve body is reduced, so that the opening / closing response can be improved.

  In addition, the guide boss is placed above the center of gravity of the valve body, and the valve body is suspended and supported by the guide post. Therefore, even when the valve body is tilted when the valve body is opened and closed, the restoring moment due to the weight of the valve body is reduced. It can be obtained relatively large, and an increase in the opening / closing driving force of the valve body can be prevented as much as possible.

  According to the second feature of the present invention, the seal member attached to the inner periphery of the plate body is provided with the first intake passage end portion even if the processing accuracy of the sliding surface of the first intake passage end portion and the valve body is rough. When the valve body is in the closed position, it is possible to reliably prevent air from leaking from the surge chamber into the valve body through the gap between the first intake passage end and the valve body.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 is a partially cutaway front view of an intake manifold having an intake control device according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 (showing a closed state of a valve body), and FIG. FIG. 4 is a sectional view taken along line 4-4 of FIG. 2, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, and FIG. FIG. 7 is a sectional view taken along the line -6, FIG. 7 shows the opened state of the valve body, a corresponding diagram with FIG. 3, FIG. 8 shows the opened state of the valve body, and a corresponding diagram with FIG. FIG. 10 is a perspective view of the assembly of the lever shaft and the operating lever, FIG. 11 is a perspective view of FIG. 10, and FIG. 12 is a perspective view of the operating lever. 13 is an operation explanatory view for comparing the driving force of the valve body between the present invention (a) and the comparative example (b).

  First, in FIGS. 1 to 3, symbol M denotes an intake manifold of an in-line four-cylinder engine E, and a surge chamber 2 having an air inlet 1 opened on the upper surface of one end along the left-right direction (the multi-cylinder arrangement direction of the engine). And four parallel first intake passages 3 bypassing part of the side wall of the surge chamber 2 and opening the upstream end portion 3a and the downstream end portion 3b into the surge chamber 2, and the upper side wall of the surge chamber 2 The upstream end 4a is opposed to the downstream end 3b of the first intake passage 3 with a space therebetween, and the four parallel second intake passages 4 and the downstream end 4b of the second intake passage 4 are mutually connected. The mounting flange 5 is integrally connected to the cylinder head of the engine E by a plurality of bolts. Thus, the downstream end portion 4b of each second intake passage 4 communicates with a corresponding intake port (not shown) of the engine E. A throttle body (not shown) for adjusting the intake air amount of the engine E is attached to the air inlet 1.

  The intake manifold M is divided into a first block Ma and a second block Mb along a vertical dividing plane P passing through the central portion of the surge chamber 2. The first block Ma includes the majority of the surge chamber 2 and the four second intake passages 4 and is made of light alloy or synthetic resin. The second block Mb includes the remaining portion of the surge chamber 2 and 4 The U-shaped intermediate portion 3c of the first air intake passage 3 is made of light alloy or synthetic resin, and both the blocks Ma and Mb are connected to each other by a plurality of bolts 7 on the dividing surface P. . Each first intake passage 3 includes the U-shaped intermediate portion 3c, a funnel-shaped upstream end portion 3a joined to the upper end surface of the second block M2 so as to be connected to the upstream end thereof, and a U-shaped intermediate portion 3c. And a cylindrical downstream end 3b joined to the upper surface of the second block M2 so as to be connected to the downstream end of the second block M2.

  Hereinafter, the downstream end portion 3b of the first intake passage 3 is referred to as a first intake passage end portion 3b, and the upstream end portion 4a of the second intake passage 4 is referred to as a second intake passage end portion 4a. A sleeve-like valve body 8 that opens and closes between the first and second intake passage end portions 3b and 4a is slidably fitted to the outer periphery of the first intake passage end portion 3b. The second intake path end portion 4a is formed of a funnel portion that is integrally formed with a common support plate 32 that is attached to the first block M1.

  A structure for attaching the cylindrical first intake passage end 3b will now be described with reference to FIGS. 4 to 6 and FIG.

  The four cylindrical first intake passage end portions 3b are integrally formed on a common support plate 9, and are screwed and fixed to the ceiling surface of the first block M1 to be fixed to the first intake passage end portion 3b. The support plate 9 is fixed by nuts 11 to the lower end portions of a plurality (five in the illustrated example) of columns 10 and 10 ′ extending in parallel with the axis of the column. At this time, the support plate 32 is sandwiched between the first block M1 and the step portion 10a of the support columns 10 and 10 '. The outer end surface of the support plate 9 is disposed on the dividing surface P.

  On the other hand, on the inner end face of the second block M2 facing the support plate 9, an annular convex wall 12 is formed surrounding the first intake passages 3 with the end face placed on the dividing plane P. An annular end face seal member 13 that is in close contact with the support plate 9 is fitted to the outer peripheral surface 12a when the first and second blocks M1 and M2 are joined to each other.

  Specifically, the end face seal member 13 includes a thick and annular base portion 13a fitted to the outer periphery of the annular convex wall 12, and an inner peripheral edge portion of the base portion 13a toward the first block M1 and radially outward. The lip 13b is a split surface P in a state where the base portion 13a is fitted to a fixed position of the base outer peripheral surface 12a of the annular convex wall 12 in its free state. It comes to protrude more. Therefore, in the joined state of the first and second blocks M1 and M2, the support plate 9 and the annular convex wall 12 are in contact with each other, and the lip 13b protruding from the dividing surface P is in close contact with the support plate 9 and expands. It is elastically deformed to generate seal pressure. The amount of elastic deformation is limited by the contact between the support plate 9 and the annular convex wall 12.

  For convenience of layout in the engine room of the automobile, the intake manifold M is arranged so that the axes of the plurality of columns 10, 10 'and the first intake passage end 3b are substantially horizontal. The plurality of struts 10 and 10 'are arranged in a staggered manner so as to straddle the array center line X connecting the centers of the four first intake passage end portions 3b. Specifically, two columns 10 are arranged above the arrangement center line X, and three columns 10 'are arranged below.

  Next, the valve body 8 and its operating mechanism will be described with reference to FIGS. 2 to 4 and FIGS. 9 to 12.

  As shown in FIGS. 2 and 3, four sleeve-type valve bodies 8 slidably fitted on the outer peripheral surfaces of the four cylindrical first intake passage end portions 3b are mounted on the inner peripheries. An annular seal member 14 is provided. These four sleeve type valve bodies 8 are integrally connected to each other via bridges 8a and 8b as shown in FIG.

  The first bridge 8a that connects the two left and right outer valve bodies 8 is disposed above the center of gravity G (see FIG. 13A) of each valve body 8, and the two valve bodies 8 in the center portion. The second bridge 8 b that connects the two is disposed at the same height as the center of gravity G of each valve body 8.

  A guide boss 15 parallel to the sleeve type valve element 8 is integrally formed on the left and right first bridges 8 a, and a bearing bush 16 is fitted on the inner peripheral surface of the guide boss 15. The bearing bushes 16 of the left and right guide guide bosses 15 are slidably fitted to the two upper columns 10. Therefore, the upper two support columns 10 also serve as guide posts for guiding the opening / closing operation of the valve body 8.

  The valve body 8 is provided with an elastic seal member 17 made of an elastic material such as rubber, which can be in close contact with the inner peripheral surface of the funnel-shaped second intake passage end 4a.

  The valve body 8 closes the elastic seal member 17 to the inner peripheral surface of the funnel-shaped second intake passage end portion 4a so as to conduct between the first and second intake passage end portions 3b, 4a (FIG. 2). 4) and an open position B (see FIGS. 7 and 8) where the elastic seal member 17 is separated from the second intake path end 4a and the second intake path end 4a is opened to the surge chamber 2. The opening position B of the valve body 8 abuts on a stopper plate 18 mounted on the support plate 9 so as to surround the root of part or all of the first intake passage end portion 3b. It is prescribed by.

  2, 9, and 10, a pair of trunnions 24 arranged on the arrangement center line X are integrally projected on the outer surfaces of the two left and right outer valve bodies 8, and each trunnion 24 has a roller. 24a is attached.

  On the other hand, in a bearing hole 20 (see FIG. 2) provided in the first block M1, a lever shaft 21 disposed in parallel with the array center line X is rotatably supported on one side of the four valve bodies 8. A pair of operating levers 22 that engage with the rollers 24 a of the pair of trunnions 24 are attached to the lever shaft 21. An output portion of an actuator 23 attached to the outer end surface of the intake manifold M is connected to one end portion of the lever shaft 21 so that the lever shaft 21 can be driven to rotate. The actuator 23 can be any type such as an electric type, an electromagnetic type, a hydraulic type, and a negative pressure type.

  As shown in FIGS. 10 to 12, the left and right actuating levers 22 are each formed by pressing a steel plate, and are bent at a right angle from one end of the base plate portion 22a in the longitudinal direction. The base plate portion 22a is formed with a pair of mounting holes 25 arranged in the longitudinal direction. A U-shaped connecting groove 26 is provided at the tip of the arm plate portion 22b. At that time, the base plate portion 22 a and the arm plate portion 22 b are arranged so that the center of the mounting hole 25 and the center of the connecting groove 26 are on the same plane 27 passing through the axis Y of the lever shaft 21. With such a configuration, the left and right actuating levers 22 are provided with compatibility. A positioning recess 34 is provided at the base of the arm plate portion 22b.

  On the other hand, a flat mounting surface 28 for mounting the two operating levers 22 is formed on one side of the lever shaft 21, and a pair of screw holes 29 aligned with the pair of mounting holes 25 are formed on each mounting surface 28. Is provided.

  Thus, when attaching the pair of operating levers 22 to the lever shaft 21, first, the lever shaft 21 is inserted into the bearing hole 20 of the first block M 1, and is inserted into the rollers 24 a of the pair of trunnions 24 of the valve body 8. The engaging grooves 26 of the pair of operating levers 22 are engaged (see FIG. 10).

  Next, when the base plate portion 22 a is overlapped with the attachment surface 28 while the lever shaft 21 is in contact with the bottom surface of the positioning recess 34 of each operating lever 22, the attachment hole 25 of the base plate portion 22 a and the screw hole 29 of the lever shaft 21. And are consistent. Therefore, the operating lever 22 is attached to the lever shaft 21 by screwing the screw 33 passed through the attachment hole 25 into the screw hole 29 and tightening it. At that time, in the left and right operation levers 22, it is necessary to make the directions of the base plate portions 22a opposite to each other.

  Next, the operation of this embodiment will be described.

  During low-speed operation of the engine E, if the lever shaft 21 is driven in the forward direction by the actuator 23, the valve element 8 can be moved to the closed position A shown in FIG. At this time, the valve body 8 is held in a state in which the elastic seal member 17 is in close contact with the inner peripheral surface of the funnel-shaped second intake passage end 4a, and the first and second intake passages 3 and 4 are continuously connected. Therefore, in the intake stroke of each cylinder of the engine E, when air whose flow rate is controlled by a throttle body (not shown) flows into the surge chamber 10 from the air inlet 1, the first and second intake passages 3, 4 and valves It is supplied to the engine E through a long pipe line composed of the body 8. Therefore, the inside of the intake manifold M is in a low-speed intake mode adapted to low-speed operation, and the charging efficiency can be improved by utilizing the inertia effect of intake air, and the low-speed output performance of the engine E can be improved.

  During this time, due to the close contact between the elastic seal member 17 of the valve body 8 and the funnel-shaped second intake passage end 4a and the close contact between the seal member 14 of the inner periphery of the valve body 8 and the outer peripheral surface of the first intake passage end 3b, Since air leakage from the surge chamber 2 into the valve body 8 can be reliably prevented, the inertia effect of intake air can be used effectively. Further, since the valve body 8 is a sleeve type, the pipe wall of the long pipe line composed of the first and second intake passages 3 and 4 and the valve body 8 is continuous continuously and does not cause turbulence of the intake air. , Prevents an increase in intake resistance and contributes to an improvement in engine E's low-speed output performance.

  At the time of high speed operation of the engine E, if the lever shaft 21 is driven in the reverse direction by the actuator 23, the valve element 8 can be moved to the open position B shown in FIG. The valve body 8 that has reached the open position B is held in a state of being separated from the funnel-shaped second intake path end 4a. As a result, since the second intake passage 4 opens the second intake passage end 4a directly into the surge chamber 2, the flow rate is controlled by a throttle body (not shown) in the intake stroke of each cylinder of the engine E. When air flows into the surge chamber 10 from the air inlet 1, the air is immediately drawn into the engine E through the second intake passage 4 having a short pipe line. Therefore, the inside of the intake manifold M becomes a high-speed intake mode adapted to high-speed operation, and the charging efficiency can be improved by utilizing the pulsation effect of intake air, and the high-speed output performance of the engine E can be improved.

  At that time, since the inlet of the second intake passage 4, that is, the second intake passage end 4a has a funnel shape, the intake air flows smoothly into the second intake passage 4 and the intake resistance can be reduced. . The fact that the inlet of the second intake passage 4 can be formed in a funnel shape in this way is due to the adoption of the sleeve-type valve body 8.

  By the way, the valve body 8 is integrally formed with a guide boss 15 having a bearing bush 16, and the bearing bush 16 slides on a guide post 10 disposed in parallel with the cylindrical first intake passage end 3b. Since the guide post 10 guides linear movement between the closed position A and the open position B of the valve body 8 by freely fitting, the valve body 8 is squeezed between the first intake passage end portion 3b. It is possible to move smoothly without raising the open / close response.

  Particularly, since the guide boss 15 and the guide post 10 can be made sufficiently smaller in diameter than the first intake passage end 3b and the valve body 8, their sliding surfaces can be processed accurately and easily. Therefore, it is possible to appropriately and easily manage these sliding gaps, while making it possible to roughen the processing accuracy of the sliding surfaces of the first intake passage end portion 3b and the valve body 8, thereby improving productivity. The improvement of this can not only contribute to cost reduction, but also the opening / closing driving force of the valve body 8 can be reduced, so that the opening / closing response can be improved, and the actuator 23 can be downsized accordingly. .

  Moreover, even if the processing accuracy of the sliding surfaces of the first intake passage end 3b and the valve body 8 is rough, the seal member 14 attached to the inner periphery of the plate body 8 is formed on the outer peripheral surface of the first intake passage end 3b. By closely contacting, when the valve body 8 is in the closed position A, air is surely prevented from leaking into the valve body 8 from the surge chamber 2 through the gap between the first intake passage end 3b and the valve body 8. Can do.

  Further, since the guide post 10 is also used as a part of the plurality of support columns 10 and 10 'for attaching the first intake passage end 3b to the first block M1, the number of parts is reduced and the structure is simplified. Can do.

  Furthermore, since the guide post 10 is disposed above the center of gravity G of the valve body 8 and supports the valve body 8 in a suspended manner, the valve body 8 can be moved with a relatively small driving force. Accordingly, the actuator 23 can be reduced in size.

  Here, the difference in operation load between the suspension method in which the guide post 10 is disposed above the center of gravity of the valve body 8 and the spanning method in which the guide post 10 is disposed below the center of gravity G will be described with reference to FIG. To do. In FIG. 13, (a) is a suspension method, and (b) is a straddling method. Reference numeral 8 denotes a valve body, G denotes a center of gravity of the valve body 8, 16 denotes a bearing bush of the guide boss 15, and 10 denotes a guide post.

Now, in order to move the valve bodies 8 of both types (a) and (b) in the same direction, when an operation load F is applied to them under the same conditions, the valve body 8 tilts and both end edges of the bearing bush 16 are p1. The guide post 10 is pressed with the force of p2. The operating load F at this time is
F = (p1 + p2) μ
It becomes. Where μ is the coefficient of friction.

  At the same time, restoring moments m1 and m2 are generated in the valve body 8 due to its own weight W, and the center of the restoring moment m1 in the method (a) is determined by the method (b The distance from the center of gravity G of the valve body 8 is farther than the center of the restoring moment m2 in FIG. As a result, the arm length L1 of the restoring moment m1 is larger than the arm length L2 of the restoring moment m2 and the weights W of both valve bodies 8 are equal, so that m1> m2, and therefore p1 by the restoring moments m1 and m2 , P2 is decreased in the method (a). Thus, the operation load F for moving the valve body 8 is sufficient for the method (b).

  Since the first intake path end 3b, the second intake path end 4a, and the struts 10, 10 'of the valve body 8 are all attached to the first block M1, the first intake path end 3b, the second intake path The coaxial accuracy of the end 4a and the valve body 8 can be improved, the smooth operation of the valve body 8 can be ensured, and the valve body 8 can be accurately opened and closed with respect to the second intake passage end 4a.

  In addition, the downstream end portion 3b is formed on the support plate 9 fixed to the support columns 10 and 10 ', and the inner end surface of the second block M2 facing the support plate 9 surrounds the first intake passage 3. Since the convex wall 12 is provided and the end face seal member 13 is attached to the outer periphery of the annular convex wall 12, the end face seal member 13 can be easily attached to the second block M2, and the first and second Even if a slight deviation occurs between the downstream end portion 3b and the intermediate portion 3c of the first intake passage 3 due to the joining error between the blocks M1 and M2, the downstream end portion 3b is brought into contact with the support plate 9 by the end face seal member 13. And the intermediate portion 3c can be reliably sealed. In particular, the support plate 9 of the downstream end portion 3b can be formed with a wide contact surface with the end face seal member 13, so that the allowable width of the joining error between the first and second blocks M1 and M2 can be increased. , It can contribute to the improvement of productivity.

  The pair of left and right actuating levers 22 attached to the lever shaft 21 are a base plate portion 22a screwed to the attachment surface 28 of the lever shaft 21 and a valve from one end of the base plate portion 22a along the axial direction of the lever shaft 21. The arm plate portion 22b is bent to the body 8 side and has a connection groove 26 formed at the tip thereof. The center of the base plate portion 22a is fixed to the lever shaft 21, that is, the center of the mounting hole 25, and the connection groove 26 Since the center is disposed on the same plane 27 passing through the axis Y of the lever shaft 21, the same operating lever 22 made of press is used as the pair of operating levers 22. A pair of actuating levers 22 can be configured simply by reversing the directions of the plate portions 22a, which can contribute to mass productivity and cost reduction.

  Since the base plate portion 22a is fixed to the side surface of the lever shaft 21 opposite to the extending direction of the arm plate portion 22b, the base plate portion 22a can serve as a balance weight with respect to the arm plate portion 22b. The operation load of the valve body 8 can be reduced.

  Further, a positioning recess 34 is provided at the base of the arm plate portion 22b, and the base plate portion 22a is positioned at a predetermined fixing position of the lever shaft 21 by bringing the outer peripheral surface of the lever shaft 21 into contact with the bottom surface thereof. The base plate portion 22a can be easily fixed to a predetermined fixing position of the lever shaft 21.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the upstream end 4a of the second intake passage 4 is formed in a cylindrical shape, the valve body 8 is slidably fitted on the outer peripheral surface thereof, and the downstream end 3b of the first intake passage 3 is formed between the second intake passage 4 and the downstream end 3b. It can be opened and closed. In the present invention, the operating lever 22 can be pivotally connected to a link connected to the valve body 8 instead of connecting the connecting groove 26 and the trunnion 24. The present invention can also be applied to a single cylinder engine and a multi-cylinder engine other than the above-described four cylinders.

The partially broken front view of an intake manifold provided with the intake control device which concerns on this invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1 (showing a closed state of the valve body). FIG. 3 is a sectional view taken along line 3-3 in FIG. 1 (showing a closed state of the valve body). FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. Corresponding figure with FIG. 3 which shows the open state of a valve body. Corresponding figure with FIG. 4 which shows the open state of a valve body similarly. The perspective view of the cylindrical 1st intake path end part and the assembly of a valve body. The perspective view of the assembly of a lever axis | shaft and an action | operation lever. 11 is a view taken in the direction of arrow 11 in FIG. 10. The perspective view of an action | operation lever. Action explanatory drawing which contrasts the operation load of a valve body with this invention (a) and a comparative example (b).

Explanation of symbols

A ... Valve body closed position B ... Valve body open position E ... Engine G ... Valve body center of gravity M ... Intake manifold 1 ... ... Air inlet 2 ... Surge chamber 3 ... First intake passage 3a ... Upstream end 3b ... Downstream end (first intake passage end)
4... Second intake passage 4a... Upstream end (second intake passage end)
4b ··· the downstream end 6 ··· intake port 8 ··· valve body 10 ··· Guide post (post)
14... Sealing member 15... Guide bosses 21, 22, 23...

Claims (2)

The intake manifold (M) attached to the engine (E) has a surge chamber (2) connected to the air inlet (1), and an upstream end (3a) and a downstream end (3b) are opened in the surge chamber (2). The upstream end (4a) is opened to the surge chamber (2) so as to face the first intake path (3) and the downstream end (3b) of the first intake path (3) with a space therebetween. In addition, a downstream end (4b) forms a second intake passage (4) that leads to the intake port (6) of the engine (E), and the opposite end portions (3, 4) of the first and second intake passages (3, 4) ( 3b, 4a) is separated from one end of the first intake passage (3b) from the closed position (A) contacting the other second intake passage end (4a) and the second intake passage end (4a). A sleeve type valve element (8) moving between the open positions (B) is slidably fitted, and this valve element (8) is driven to open and close. That drive devices (21, 22, 23) coupled, in the intake control device for an engine,
A guide boss (15) is formed on the valve body (8), the guide boss (15) being positioned in the opening / closing direction of the valve body (8) above the center of gravity (G) of the valve body (8). An intake control device for an engine, characterized in that a guide post (10) that slidably fits and supports the valve element (8) in a suspended manner is fixed to the intake manifold. The intake control apparatus for an engine according to claim 1,
An intake control device for an engine, characterized in that a seal member (14) closely attached to an outer peripheral surface of the first intake passage end (3b) is attached to an inner periphery of the plate body.

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