JP2008002297A - Rotational movement regulating structure of rotary valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational movement regulating structure of a rotary valve, capable of easily installing an intake casing for inserting and arranging the rotary valve in an engine and an intake manifold. <P>SOLUTION: This rotational movement regulating structure of the rotary valve is formed by inserting a collar member 14 into a valve inserting hole 19 of the intake casing 3 so as to correspond to a connecting part 31 of the rotary valve 21 and extend in the vertical direction. Cutout parts 31d are respectively formed in adjacent two front side and lower side plate parts 31a of a connecting body 31b of the connecting part 31 of the rotary valve 21 so as to correspond to the collar member 14. These cutout parts 31d regulate a rotational movement range of the rotary valve 21 between an opening position and a closing position by abutting on an outside surface of the collar member 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation restricting structure for a rotary valve.

  Conventionally, a rotary valve is in an engine operating state in a valve insertion hole formed in an intake casing having an intake passage formed for each cylinder of a multi-cylinder engine and extending in the cylinder row direction and crossing each intake passage. In response to this, there is known an intake device that is rotatably inserted so as to variably adjust the flow of intake air (see, for example, Patent Document 1).

The rotary valve has a plurality of valve main bodies arranged in the valve insertion holes so as to correspond to the respective intake passages, and a connecting portion that connects adjacent valve main bodies. The rotary valve goes back and forth between an open position corresponding to the engine high speed operation state and a closed position corresponding to the engine low speed state.
Japanese translation of PCT publication No. 2004-526098

  By the way, when the intake casing having the rotary valve inserted therein is assembled to an engine, an intake manifold or the like, if the rotary valve rotates freely, the rotary valve moves to a position other than between the open position and the closed position. Therefore, there is a possibility that the assembling work may be troublesome.

  The present invention has been made in view of the above points, and an object thereof is to easily assemble an intake casing into which an rotary valve is inserted in an engine, an intake manifold, or the like in a rotary valve rotation restricting structure. It is to provide the technology that can.

  According to a first aspect of the present invention, an engine operating state is provided in a valve insertion hole formed in an intake casing having an intake passage formed for each cylinder of a multi-cylinder engine so as to extend in the cylinder row direction and cross the intake passages. A rotary valve rotation restricting structure that is rotatably inserted so as to variably adjust the flow of intake air in response to the rotary valve, and the rotary valve is disposed in the valve insertion hole so as to correspond to each intake passage. A plurality of valve main bodies and a connecting portion for connecting adjacent valve main bodies, and the valve insertion hole has a collar corresponding to the connecting portion and extending in the direction in which each intake passage extends. A member is inserted, and the connecting portion comes into contact with the outer surface of the collar member, so that the rotary range of the rotary valve is adjusted to the open position corresponding to the engine high speed operation state and the engine low speed operation. It is characterized in that it has a regulating portion for regulating between a closed position corresponding to the state.

  As a result, the connecting portion is provided with a restricting portion that restricts the rotational range of the rotary valve between the open position and the closed position by contacting the outer surface of the collar member, so that the intake casing in which the rotary valve is inserted is provided. When assembling this to an engine, intake manifold, etc., the rotary valve can be prevented from going to a position other than between the open position and the closed position.For this reason, the rotary valve can be inserted using the existing connecting portion. The installed intake casing can be easily assembled to the engine or intake manifold.

  According to a second aspect, in the first aspect, the rotary valve is configured to go to the closed position by rotating approximately 90 degrees from the open position, and the connecting portion includes four plates. A connecting body having a cross-shaped cross section, and the restricting portion is a notch portion formed on each of two adjacent plate portions so as to correspond to the collar member. is there.

  As a result, the restricting portion is configured by notches formed in the two adjacent plate portions of the connecting body so as to correspond to the collar member, so the rotary valve is inserted with a simple configuration. The intake casing can be easily assembled to the engine or intake manifold.

  In a third aspect based on the second aspect, the connecting portion further includes a wall portion attached to the connecting body so as to be orthogonal to the cylinder row direction in addition to the connecting body. Is.

  Thereby, in addition to a connection main body, since the wall part attached to the connection main body so as to be orthogonal to a cylinder row direction is further provided in the connection part, the rigidity of a connection part can be improved.

  According to the present invention, the connecting portion is provided with the restricting portion that restricts the rotational range of the rotary valve between the open position and the closed position by contacting the outer surface of the collar member. When the intake casing is assembled to an engine or intake manifold, it is possible to prevent the rotary valve from going to a position other than between the open position and the closed position. The intake casing with the valve inserted can be easily assembled to the engine or intake manifold.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 3 show an intake device 1 having a rotation restricting structure for a rotary valve 21 according to an embodiment of the present invention. The intake device 1 includes an intake casing 3 made of resin, and the intake casing 3 is mounted on an engine 5 provided with two cylinders (not shown) arranged in a direction in which a crankshaft (not shown) extends. ing. An intake passage 7 is formed in the intake casing 3 for each cylinder of the engine 5, and an upper flange 9 is integrally formed on the outer periphery of the upstream end of the intake passage 7. The lower flange 11 having an annular seal groove 11a on the lower surface is integrally formed to project.

  Further, two boss portions 13 having collar through holes 13a extending in the vertical direction are integrally formed on the outer periphery of the intake casing 3 so as to correspond to the intake passages 7, and are formed in the collar through holes 13a. The metal cylindrical collar member 14 is inserted. Two of these collar members 14 (front side in FIG. 1) correspond to the connecting portion 31 of the rotary valve 21 and extend in the vertical direction (corresponding to “the direction in which each intake passage 7 extends”). In this way, they are inserted through the valve insertion holes 19 of the intake casing 3 side by side in the cylinder row direction (see FIG. 6). Then, with the lower flange 11 of the intake casing 3 having the rotary valve 21 inserted on the upper surface of the engine 5, a bolt (not shown) is attached to the collar member 14 of the bolt insertion hole 13 a of the boss portion 13 of the intake casing 3. The intake casing 3 is assembled to the engine 5 by being screwed into a screw hole (not shown) formed in the engine 5.

  Further, an intake manifold (not shown) connected to a surge tank (not shown) is disposed on the upstream side of the intake casing 3, and a flange 17 is provided at the lower end of the intake manifold 3. An overhang is integrally formed so as to correspond to the upper flange 9. A mounting hole 9 a is formed in the upper flange 9 of the intake casing 3, and a bolt (not shown) is formed in a state where the flange 17 of the intake manifold is overlapped on the upper flange 9 in which the rotary valve 21 is inserted. Is inserted into a mounting hole (not shown) formed in the flange 17 of the intake manifold and screwed into the mounting hole 9a of the upper flange 9 of the intake casing 3 so that the intake manifold is assembled to the intake casing 3. Yes. An EGR is disposed on the upstream side of the surge tank.

  By the way, at the time of the above assembly, due to the connecting portion 31 of the rotary valve 21, the rotation range of the rotary valve 21 is the open position corresponding to the high speed operation state of the engine 5 (see FIG. 3B) and the low speed operation of the engine 5. It is regulated between the closed position corresponding to the state (see FIG. 3A). Details of this will be described later.

  A circular valve insertion hole 19 is formed in the intake casing 3 as viewed from the cylinder row direction so as to extend in the cylinder row direction and cross the intake passages 7. A resin-made rotary is formed in the valve insertion hole 19. The valve 21 is rotatably inserted so as to variably adjust the flow of intake air according to the operating state of the engine 5. A boss 23 having a mounting hole 23a is integrally formed at the lower end of the intake casing 3, and the fuel injection nozzle 25 is connected to the injection hole 25a at the downstream end of the intake passage 7 below the valve insertion hole 19 in the mounting hole 23a. It is attached at an angle so that it can face.

  On the side of the fuel injection nozzle 25 at the downstream end of each intake passage 7, a flat plate-like partition wall 27 is disposed close to the intake flow direction, and the downstream end side of the intake passage 7 below the rotary valve 21 is arranged, The partition wall 27 divides the first passage 7a having a large passage cross-sectional area and the second passage 7b having a narrow passage cross-sectional area that is arranged in parallel with the first passage 7a and faces the fuel injection nozzle 25.

  As shown in FIGS. 2 to 6, the rotary valve 21 includes two cylindrical valve bodies 29 disposed in the valve insertion holes 19 so as to correspond to the intake passages 7, and adjacent valve bodies 29. The space is integrally connected by a connecting portion 31. The connecting portion 31 includes a connecting body 31b having a cross-shaped cross section composed of four plate portions 31a, and a circular wall portion 31c attached to the center of the connecting body 31b in the axial direction of the bubble body so as to be orthogonal to the cylinder row direction. It has. Two adjacent semicircular cutouts 31d (corresponding to restricting portions) are formed on the two adjacent front and lower plate portions 31a of the plate portions 31a so as to correspond to the front collar members 14, respectively. Has been. These notches 31d are in contact with the outer surfaces of the front collar members 14 so that the rotary range of the rotary valve 21 is within the open position (see FIGS. 3B and 6B) and the closed position (FIG. 3). (See (a) and FIG. 6 (a)). Note that the rotary valve 21 is moved from the open position to the closed position by rotating approximately 90 degrees clockwise as shown in FIGS. 3B and 6B.

  Support shafts 33 extending in the cylinder row direction are integrally projected from both end surfaces of each valve body 29 in the cylinder row direction. Of these support shafts 33, one of the support shafts 33 (the left support shaft 33 in FIGS. 2, 4 and 5) is formed in a cross-sectional shape on the base end side and in a cross-sectional shape on the distal end side. . The one support shaft 33 is pivotally supported by an annular bearing 37 that is fitted and accommodated in a bearing accommodation hole 35 of the intake casing 3. The bearing housing hole 35 is formed in a circular shape when viewed from the cylinder row direction at one end (left side in FIG. 2) of the intake casing 3 in the cylinder row direction.

  The valve insertion hole 19 and the bearing accommodation hole 35 are formed in the valve body axially inner portion (the boundary portion between the cross-shaped cross section and the circular cross-section) of the one support shaft 33 in the axial direction of the valve body. The disc-shaped flange portion 33a for partitioning is formed so as not to slidably contact the inner surface of the intake casing 3. Specifically, the flange portion 33 a is disposed at the opening of the bearing housing hole 35 so as not to be in sliding contact with the inner surface of the bearing housing hole 35. That is, the diameter of the flange 33 a is set smaller than the diameter of the opening of the bearing housing hole 35.

  The other support shaft 33 among the support shafts 33 has the same configuration as the one support shaft 33. The other support shaft 33 is pivotally supported by an annular bearing (not shown) fitted and accommodated in a bearing accommodation hole (not shown) at the other end in the cylinder row direction of the intake casing 3.

  The other support shaft 33 is connected to an output shaft of a conventionally known electric actuator (not shown) attached to the other end of the intake casing 3 in the cylinder row direction, and this actuator is connected to an engine control device (not shown). Connected). This engine control device detects the rotation speed of the engine 5 and determines whether the engine 5 is in a low-speed operation state near the idle rotation speed or a high-speed operation state higher than the idle rotation speed. It is configured as follows. Based on the determination result, the engine control device switches the operation of the actuator to rotate the rotary valve 21.

  A through passage 43 is formed in the valve body 29 in a substantially circular shape when viewed from the intake flow direction so as to communicate the upstream side and the downstream side of the intake passage 7. A circular ring-shaped seal groove 41 is recessed in the outer peripheral surface of the valve main body portion 39 (hereinafter referred to as “circular wall portion 39”) on both sides in the axial direction of the valve main body 43. A first valve piece 45 that variably adjusts the flow of intake air according to the operating state of the engine 5 extends in the valve body axial direction and is integrally connected to the circular wall portions 39. The first valve piece 45 forms a part of the outer peripheral surface of the valve body 29 with the outer peripheral surface being rectangular and a flat surface. In addition, the both circular wall portions 39 are integrally bridged so that a flat-plate-shaped reinforcing bridge portion 47 is positioned on the center line of the valve body 29 and parallel to the first valve piece portion 45. Has been. The length of the reinforcing bridge portion 47 in the direction orthogonal to the valve body axis is set to be shorter than the outer diameter of the rotary valve 21, and one end portion 47 a of the reinforcing bridge portion 47 in the direction orthogonal to the valve body axis is rotary. While located on substantially the same plane as the outer peripheral surface of the valve 21, the other end 47 b is spaced inward from the outer peripheral surface of the rotary valve 21. Further, a second valve piece portion 49 extends in the valve body axial direction and is integrally connected to the circular wall portions 39 so as to face the first valve piece portion 45. The second valve piece 49 has a rectangular outer peripheral surface and a flat surface, and constitutes a part of the outer peripheral surface of the valve body 29. In addition, the inner surfaces of the circular wall portions 39 between the reinforcing bridge portion 47 and the valve piece portions 45 and 49 gradually inwardly expand from the reinforcing bridge portion 47 side to the valve piece portions 45 and 49 side. I'm out. As a result, the two circular wall portions 39 are connected at three locations by the reinforcing bridge portion 47 and the first and second valve piece portions 45 and 49, and the rigidity of the valve body 29 is enhanced. The first valve piece 45 closes the first passage 7a during low-speed operation of the engine 5, and the first passage 7a is disconnected from the intake passage 7 upstream of the rotary valve 21 (FIG. 3). In addition, the first passage 7a is opened during high-speed operation of the engine 5, and the first passage 7a communicates with the intake passage 7 upstream of the rotary valve 21 (FIG. 3B). reference). Further, the second passage 7 b is always in communication with the upstream side of the intake passage 7 without being opened and closed by the rotation of the valve body 29 in the entire operation region of the engine 5.

  Each valve body 29 is provided with a nylon seal member 51. The seal member 51 includes a pair of plate-like ring portions 53. The ring portions 53 are fitted into the seal groove portions 41 of the valve main body 29 so as to be movable in the radial direction of the valve main body 29, and the outer peripheral surface is in sliding contact with the inner surface of the valve insertion hole 19 of the intake casing 3. It has become.

-Intake device operation-
Next, the operation of the intake device 1 configured as described above will be described.

<During high-speed operation of engine 5>
When the actuator is activated for high speed by a control signal output from the engine controller, the rotary valve 21 causes the first valve piece 45 to be moved to the valve position as shown in FIG. It becomes an opening position which positions in the insertion hole 19 and opens the 1st channel | path 7a. The reinforcing bridge portion 47 is positioned along the intake air circulation direction so as not to hinder the intake air flow. As a result, the intake air flowing into the intake passage 7 from the intake manifold flows into the first passage 7a and the second passage 7b through the through passage 43, and mixes with the fuel injected from the fuel injection nozzle 25 to generate an air-fuel mixture. While flowing through the intake port (not shown) of the engine 5.

  When the rotary valve 21 is in the open position, the notch 31d of the front plate portion 31a of the connecting portion 31 of the rotary valve 21 comes into contact with the outer surface of the front collar member 14 as shown in FIG. Thereby, the counterclockwise rotation shown in FIG. 6B of the rotary valve 21 is restricted. The rotation restriction of the rotary valve 21 is similarly performed when the intake casing 3 is assembled to the engine 5 or the intake manifold.

<During engine 5 running at low speed>
When the actuator enters an operating state for low speed by a control signal output from the engine control device, the rotary valve 21 causes the first valve piece 45 to move to the engine as shown in FIG. It becomes a closed position which is located on the 5 side and closes the first passage 7a. At this time, the second passage 7b is opened, and a gap S is formed between the other end 47b of the reinforcing bridge portion 47 and the inner surface of the valve insertion hole 19. As a result, the intake air that has flowed into the intake passage 7 from the intake manifold flows into the narrow second passage 7b through the gap S to increase the flow velocity, and the mixing with the fuel injected from the fuel injection nozzle 25 is promoted and mixed. It flows through an intake port (not shown) of the engine 5 while generating air.

  When the rotary valve 21 is in the closed position, the cutout portion 31d of the lower plate portion 31a of the connecting portion 31 of the rotary valve 21 comes into contact with the outer surface of the front collar member 14 as shown in FIG. Thereby, the clockwise rotation shown in FIG. 6A of the rotary valve 21 is restricted. The rotation restriction of the rotary valve 21 is similarly performed when the intake casing 3 is assembled to the engine 5 or the intake manifold.

-Effect-
As described above, according to the present embodiment, the coupling portion 31 is provided with the notch portion 31d that restricts the rotation range of the rotary valve 21 between the open position and the closed position by contacting the outer surface of the collar member 14. Therefore, when the intake casing 3 into which the rotary valve 21 is inserted is assembled to the engine 5 or the intake manifold, the rotary valve 21 can be prevented from going to a position other than between the open position and the closed position. For this reason, the intake casing 3 into which the rotary valve 21 is inserted can be easily assembled to the engine 5, the intake manifold, or the like using the existing connecting portion 31.

  Further, since the restricting portion is constituted by the notch portions 31d formed in the two adjacent plate portions 31a of the connecting body 31b so as to correspond to the collar member 14, the rotary valve 21 can be configured with a simple configuration. The intake casing 3 in which is inserted can be easily assembled to the engine 5 or the intake manifold.

  In addition to the connecting body 31b, the connecting part 31 is further provided with a circular wall 31 attached to the connecting body 31b so as to be orthogonal to the cylinder row direction, so that the rigidity of the connecting part 31 can be increased. it can.

(Other embodiments)
In this embodiment, the case where the adjacent valve main bodies 29 are integrally connected by the connecting portion 31 having a cross section in cross section is illustrated, but the shape of the connecting portion 31 may be other than this. In this case, the configuration and position of the collar member 14 and the notch 31d may be changed according to the shape of the connecting portion 31.

  Further, in this embodiment, the rotary valve 21 is rotated by approximately 90 degrees from the open position to reach the closed position, but this rotation angle may be other than this. In this case, what is necessary is just to change the structure, position, etc. of the collar member 14, the connection part 31, and the notch part 31d according to the rotation angle.

  Further, in this embodiment, the notch portion 31d is provided as the restricting portion, but the rotational range of the rotary valve 21 can be restricted between the open position and the closed position by contacting the outer surface of the collar member 14. As long as this restriction part is not limited.

  In addition, in this embodiment, the circular wall portion 31c is formed in the connecting portion 31, but the circular wall portion 31c may be omitted.

  Further, in this embodiment, the case where the intake device 1 is applied to a two-cylinder engine is illustrated, but the present invention can also be applied to an engine having three or more cylinders. In this case, the valve body 29 and the seal member 51 are connected to the cylinder. It may be provided according to the number.

  Furthermore, in this embodiment, the intake device 1 in which the rotary valve 21 inserted in the valve insertion hole 19 of the intake casing 3 is switched to change the cross-sectional area of the intake passage 7 in accordance with the operating state of the engine 5 is illustrated. However, the present invention can also be applied to an intake device in which the effective length of the intake passage is changed in accordance with the operating state of the engine by switching a rotary valve provided at a branch point of the intake passage.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the rotary valve rotation restricting structure according to the present invention can be applied to an application for easily assembling an intake casing having a rotary valve inserted therein to an engine, an intake manifold, or the like.

1 is a perspective view of an intake device according to an embodiment of the present invention. FIG. 3 is a perspective view of the intake device in a state where the intake casing is cut along a plane parallel to the cylinder row direction. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, (a) is a diagram illustrating a low speed operation of the engine, and (b) is a diagram illustrating a high speed operation of the engine. It is a perspective view of a rotary valve. It is a top view of a rotary valve. FIG. 4 is a cross-sectional view taken along the line VI-VI in FIG. 1, (a) is a diagram illustrating a low speed operation of the engine, and (b) is a diagram illustrating a high speed operation of the engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake device 3 Intake casing 5 Engine 7 Intake passage 14 Collar member 19 Valve insertion hole 21 Rotary valve 29 Valve main body 31 Connection part 31a Plate part 31b Connection main body 31c Circular wall part 31d Notch part (regulation part)

Claims (3)

In the intake casing having an intake passage formed for each cylinder of a multi-cylinder engine, the flow of intake air flows into a valve insertion hole formed so as to extend in the cylinder row direction and cross each intake passage according to the engine operating state. A rotary valve rotation restricting structure that is rotatably inserted so as to be variably adjusted.
The rotary valve has a plurality of valve bodies arranged in the valve insertion holes so as to correspond to the intake passages, and a connecting portion for connecting adjacent valve bodies,
A collar member is inserted into the valve insertion hole so as to correspond to the connecting portion and extend in a direction in which each intake passage extends.
The connecting portion is provided with a regulating portion that abuts on the outer surface of the collar member to regulate the rotation range of the rotary valve between an open position corresponding to an engine high speed operation state and a closed position corresponding to an engine low speed operation state. A structure for restricting the rotation of a rotary valve. In the rotary valve rotation restricting structure according to claim 1,
The rotary valve is configured to go to the closed position by rotating approximately 90 degrees from the open position,
The connecting part has a cross-shaped cross-shaped connecting body consisting of four plate parts,
2. The rotary valve rotation restricting structure according to claim 1, wherein the restricting portion is a notch portion formed in each of two adjacent plate portions so as to correspond to the collar member. In the rotary valve rotation restricting structure according to claim 2,
In addition to the connection body, the connection portion further includes a wall portion attached to the connection body so as to be orthogonal to the cylinder row direction.

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