JP2006037728A - Seal structure for variable intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide seal structure for a variable intake device for improving sealability between a pair of intake aggregating parts, in a case where a control valve constituted of a valve element and a valve seat is formed separately from passage structure. <P>SOLUTION: A semi-circular grooves 24 whose wall faces are inclined to be opposite to each other are formed to an end face brought into contact with partition wall seal 13 as a seal member of a partition wall 6 as structure of a passage component. An outer periphery of the partition wall seal 13 disposed to a base plate 12 is provided with a high central bead 28 and low right and left beads 29 formed so that their height are along a cross-sectional shape of the semi-circular groove 24. Therefore, an outer peripheral part of the base plate 12 is sealed by the contact of tip parts of the central bead 28 and right and left beads 29 with a bottom part and wall faces of the semi-circular groove 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal structure of a variable intake device that includes a pair of intake manifold portions for variable resonance supercharging to an internal combustion engine and a control valve that communicates and shuts off the intake manifold portions.

  Conventionally, in order to improve the torque characteristics of an internal combustion engine, a pair of intake manifold portions, a communication passage that connects the pair of intake manifold portions to each other, and a control valve that opens and closes the communication passage according to operating conditions are provided. A variable intake device for an internal combustion engine that effectively achieves both resonance supercharging and inertial supercharging is known (see Patent Document 1).

This is because a pair of intake air collecting portions that gather together branch pipes communicating with a cylinder group whose ignition order is not continuous are mutually formed by a communication passage formed of a casting such as an aluminum alloy and defined in a plurality by partition walls. A control valve is provided at the center of each communication path. In the low speed rotation region of the internal combustion engine, the control valve is closed to cut off the communication between the pair of intake air collecting portions, thereby performing resonance supercharging using the pulsation effect of the intake air and high speed rotation of the internal combustion engine. In the region, the control valve is opened so that the pair of intake air collecting portions communicate with each other via the communication path, thereby performing inertia supercharging utilizing the air column inertia of the intake air. The control valve has a bearing hole that rotatably supports the valve shaft of each control valve in a partition wall and a side wall at a central portion of each communication passage, and a rectangular shape of the control valve is formed on the valve shaft supported by the bearing hole. The valve body is configured to be fixed.
JP-A-6-2625

  By the way, such variable resonance supercharging is accompanied by pressure pulsation in a state where the pair of intake manifold portions cancel each other. Therefore, when the valve is closed, the pair of intake manifold portions are reliably separated by the control valve so as not to disturb the resonance effect. There is a need.

  However, in the control valve of the above-described conventional example, the bearing hole and the valve seat that support the valve shaft are machined into the passage structure formed of a casting made of an aluminum alloy or the like constituting the communication passage. In order to maintain high airtightness when the valve is closed, high-precision machining is required, and there is a problem of high cost.

  The problem of high cost by improving the airtightness of the valve body and the valve seat of the control valve is that the control valve composed of the valve body and the valve seat is configured separately from the passage structure and assembled to the passage structure. However, it is also necessary to improve the airtightness between the control valve and the passage structure so as not to inhibit the resonance effect.

  Accordingly, the present invention has been made in view of the above-described problems, and can improve the sealing performance between a pair of intake manifold portions when a control valve including a valve body and a valve seat is formed separately from a passage structure. It is an object of the present invention to provide a seal structure for a variable intake device.

  The present invention includes a plurality of collecting portions that collect branch pipes that communicate with a group of cylinders in which the ignition order of the internal combustion engine is not continuous, and a control valve that opens and closes a passage that connects these collecting portions according to operating conditions. In the seal structure of the variable intake device, the control valve inserts a base plate having an openable / closable port into the passage element from the insertion port, and a seal member is interposed between the outer periphery of the base plate and the component of the passage element. A concave groove whose wall surfaces are inclined to face each other is formed at a portion where the seal member of the constituent element of the passage element contacts, and the height of the groove on the outer periphery of the seal member arranged on the base plate is the cross-sectional shape of the concave groove. A high center bead and a low left and right bead are formed, and the contact between the center bead of the seal member and the tip of the left and right beads and the bottom and wall surface of the groove of the passage element is formed. The bamboo plate outer peripheral portions so as to seal.

  Therefore, according to the present invention, a concave groove whose wall surfaces are inclined to face each other is formed at a portion where the sealing member of the component of the passage element contacts, and the height of the outer periphery of the sealing member disposed on the base plate of the control valve is increased. A high center bead and low left and right beads are formed along the cross-sectional shape of the groove, and the outer periphery of the base plate is formed by contact between the center bead of the seal member and the tip of the left and right beads and the bottom and wall surface of the groove of the passage element. Since sealing is performed, the sealing performance can be improved by a multiple sealing function.

  Hereinafter, an embodiment of a seal structure for a variable intake device of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a variable intake device of an internal combustion engine to which a seal structure of a variable intake device to which the present invention is applied, FIG. 2 is a view taken along an arrow A in FIG. 1, FIG. 3 is a perspective view of a control valve, and FIG. It is sectional drawing which shows the seal structure of a control valve and a channel | path structure.

  The variable intake device shown in FIG. 1 and FIG. 2 is illustrated in which a manifold 2 forming a pair of intake air collecting portions 1A and 1B and an intake air collecting portion 1A and 1B of the manifold 2 are respectively branched and connected to a cylinder head. A branch manifold 3 connected to the lower manifold, a pair of intake passages 5A and 5B for independently introducing the intake air into the pair of intake manifold portions 1A and 1B of the manifold 2, and a pair of intake air of the manifold 2 And a control valve 7 for opening and closing a communication hole penetrating the partition wall 6 separating the collecting portions 1A and 1B. The inlet side of the introduction pipe 4 is connected to an air cleaner or the like via a throttle chamber (not shown).

  As shown in FIG. 2, the manifold 2 divides the inside of the casing by a partition wall 6 to form a space (chamber) that becomes a pair of intake air collecting portions 1A and 1B. The manifold 2 shown in FIG. 1 shows one intake assembly portion 1A (the front side in the figure) separated by a partition wall 6. The spaces constituting the pair of intake manifold portions 1A, 1B are opened on the side connected to the branch manifold 3, and the intake manifold portions 1A, 1B are communicated with the respective inlets of the corresponding branch manifold 3. 1 is connected to branch pipes 3A, 3B, and 3C from the front side (right side in the drawing) to the second, fourth, and sixth cylinders, and sandwiches the partition wall 6 therebetween. The opening of the intake collecting portion 1B on the other side (the back side across the partition wall in the figure) communicates with a branch pipe to the first, third, and fifth cylinders (not shown).

  The manifold 2 communicates a pair of intake air collecting portions 1A and 1B to the outlets of the pair of passages 5A and 5B divided by the partition wall 10 of the introduction pipe 4 on the side connected to the introduction pipe 4. Openings 15A and 15B are provided. That is, the partition wall 6 and the partition wall 10 are connected by the outlet of the introduction pipe 4 and the inlets 15 </ b> A and 15 </ b> B of the manifold 2.

  Further, a flange 11 for mounting the control valve 7 is formed at one end of the manifold 2, and the end face of the partition wall 6 exposed inside the flange 11 is retracted into a trapezoidal shape inside the manifold 2 to control the control valve 7. Are connected to the outer periphery of the base plate 12 via a partition wall seal 13. The partition wall 6 on the manifold 2 side that is connected to the base plate 12 of the control valve 7 is formed thick, and is formed in a semicircular groove 24 that is recessed in the end surface, as will be described later. This semicircular groove can be formed by machining such as an end mill.

  As shown in FIG. 3, the control valve 7 includes a base plate 12 constituting a valve seat, a mounting flange 16 formed perpendicular to the base plate 12, and a valve hole 17 provided in the base plate 12 so as to constitute the valve seat. A valve body 18 that can be opened and closed, and an actuator 19 that rotates the valve shaft integrated with the valve body 18 from the outside of the mounting flange 16 are provided. The mounting flange 16 can be coupled to the flange 11 formed on the manifold 2 and the branch manifold 3 via a seal ring 20. The base plate 12 and the mounting flange 16 are integrally formed by injection molding of a polyamide-based synthetic polymer resin (trade name: nylon) or the like so as to have high shape accuracy. The partition seal 13 is formed of an elastic body such as rubber (including synthetic rubber).

  The outer periphery of the base plate 12 erected from the mounting flange 16 is formed in a trapezoidal shape that becomes narrower as it moves to the tip of the base plate 12, and the outer peripheral surface thereof has a manifold 2 side when joined to the partition wall 6 of the manifold 2. A peripheral groove 21 is formed in contact with the trapezoidal end of the partition wall 6 to hold and engage the partition wall seal 13 that blocks communication between the intake air collecting portions 1A and 1B.

  The partition seal 13 held and engaged with the outer periphery of the base plate 12 of the control valve 7 is formed by opening a bottom portion in a trapezoidal shape along the outer periphery of the base plate 12. As shown in FIG. 4, the cross-sectional shape of the partition wall seal 13 has a base portion 22 fitted to the outer periphery of the base plate 12, and protrudes from the base portion 22 toward the peripheral groove 21 on the outer periphery of the base plate 12 to fit into the peripheral groove 21. The stopper portion 23 and a plurality of bead portions 25 that protrude from the base portion 22 toward the partition wall 6 side of the manifold 2 and engage with the semicircular grooves 24 formed on the end surface of the partition wall 6 extend over the entire length of the partition wall seal 13. Prepare. 4 shows a state at the start of contact between the partition seal 13 and the semicircular groove 24 on the end face of the partition wall 6 in the middle of assembling the control valve 7 to the manifold 2, and the assembled state is schematically shown by a broken line. Show.

  The base portion 22 is formed wider than the thickness of the base plate 12 of the control valve 7, and both width ends project from both sides of the base plate 12 and are fitted to the outer periphery of the base plate 12. The base portions (back surface) 22 on both sides of the protruding stopper portion 23 abut against the outer peripheral surface of the base plate 12 on both sides of the circumferential groove 21, and the bead portion 25 of the partition wall seal 13 is elastically contacted with the end surface of the partition wall 6 for sealing. When the stopper portion 23 is retracted into the circumferential groove 21 due to the reaction force of the first inner seal, the first inner seal exerts a sealing function between the base plate 12 and the partition wall seal 13 by contacting the edge portion of the circumferential groove 21 with a high surface pressure. The unit 26 is configured.

  Further, both end portions of the base portion 22 are in contact with the edge of the semicircular groove 24 formed at the end portion of the partition wall 6 which is a counterpart member, and are bent toward the base plate 12 side of the control valve 7 so that the back surface of the base portion 22 is bent. Comes into contact with the edge of the outer peripheral surface of the base plate 12 with a high surface pressure, and here also forms a second inner seal portion 27 that exhibits a sealing function between the base plate 12 and the partition wall seal 13.

  The stopper portion 23 protrudes from the base portion 22 into the circumferential groove 21 on the outer periphery of the base plate 12, and is fitted with a gap between the bottom portion and the side wall of the circumferential groove 21. The gap between the tip of the stopper 23 and the bottom of the circumferential groove 21 allows the base portion 22 to be deformed into the circumferential groove 21, and is constituted by a back portion of the base portion 22 and an edge portion of the circumferential groove 21. The inner seal portion 26 is allowed to contact at a high surface pressure.

  In addition, the gap is softly brought into contact with the semicircular groove 24 on the partition wall 6 side of the center bead 28 constituting the bead portion 25 described later by bending deformation of the base portion 22 and the stopper portion 23 at the initial contact. When the tip of the stopper 23 comes into contact with the bottom of the circumferential groove 21, the contact pressure is set to be rapidly increased by compressive deformation of the base portion 22 and the stopper portion 23. In order to adjust the strength of bending deformation and compression deformation of the base portion 22 and the stopper portion 23, the stopper portion 23 is provided with a plurality of rectangular spaces 30 over the entire length of the partition wall seal 13 as shown in the figure. ing.

  The gap (d) between the tip of the stopper 23 and the bottom of the peripheral groove 21 of the base plate 12 is set to be smaller than the height difference (e) between the center bead 28 and the left and right beads 29 so that the tip of the center bead 28 is left and right. It is prevented from becoming lower than the tip of the bead 29.

  The bead portion 25 includes three beads 28 and 29 that protrude from the base portion 22 toward the partition wall 6 side of the manifold 2 and engage with semicircular grooves 24 formed on the end surface of the partition wall 6. The center bead 28 is set higher than the left and right beads 29 so that the height of each bead 28, 29 follows the shape of the semicircular groove 24 on the end face of the partition 6 on the other side. The center bead 28 is in contact with the center bottom of the semicircular groove 24 on the end face of the partition wall 6 from the front to constitute a first outer seal portion 31 that exhibits a sealing function between the partition wall 6 and the partition seal 13.

  Further, the left and right beads 29 are in contact with the inclined left and right intermediate wall surfaces of the semicircular groove 24 and are elastically contacted with the semicircular groove 24 while being bent toward the center bead 28, so that the partition wall 6 and the partition seal 13 are formed. The 2nd outer side seal part 32 which exhibits the sealing function in between is comprised. The back surface of the base portion 22 where the left and right beads 29 are erected is configured as a first inner seal portion 26 that contacts the edge portion of the circumferential groove 21 with a high surface pressure. That is, the width (a) on both outer sides of the left and right beads 29 is made larger than the width (b) of the circumferential groove 21 and the width (c) on both inner sides of the left and right beads 29 is made smaller than the width (b) of the circumferential groove 21. The width (b) of the circumferential groove 21 is set between the width (a) and the width (c). For this reason, the seal reaction force of the second outer seal portion 32 formed by the left and right beads 29 becomes the contact pressure of the first inner seal portion 26, and the sealing performance of both the seal portions 26 and 32 is enhanced.

  Also. The reaction force against the bending of the left and right beads 29 constituting the second outer seal portion 32 toward the central bead 28 acts in the lateral direction perpendicular to the depth direction with respect to the semicircular groove 24 of the partition wall 6 and Since the lateral forces oppose each other, the centering function for preventing the center seal between the partition wall seal 13 and the semicircular groove 24 is exhibited.

  In the seal structure of the variable intake device having the above configuration, the valve shaft, the valve body 18 and the actuator 19 are attached to the integrated mounting flange 16 and the base plate 12, and the stopper portion 23 of the partition wall seal 13 is attached to the peripheral groove 21 of the base plate 12. The control valve 7 is assembled by fitting the control valve 7 into the manifold 2 while being aligned so that the partition wall seal 13 faces the end of the partition wall 6 of the manifold 2. Assembling can be performed by fixing the mounting flange 16 to the flange 11 of the manifold 2 with the seal 13 interposed therebetween.

  In the above assembly, since the end of the partition wall 6 and the outer periphery of the base plate 12 are both trapezoidal, the central bead 28 of the partition wall seal 13 and the just before the flanges are joined together with the partition wall seal 13 interposed therebetween. The left and right beads 29 come into contact with the semicircular groove 24 on the partition 6 side, and the partition seal 13 and the base plate 13 are positioned while being guided by the semicircular groove 24 and the left and right beads 29. For this reason, as shown by the broken line in FIG. 4, the partition seal 13 can be assembled while being deformed to the desired shape at the intended position, the assembling accuracy and assembling workability can be improved, and a reliable seal The function can be demonstrated.

  Moreover, since the end of the partition wall 6 and the outer periphery of the base plate 12 are trapezoidal, the central bead 28 and the left and right beads 29 of the partition wall seal 13 are semicircular on the side of the partition wall 6 immediately before they are joined with the partition wall seal 13 interposed therebetween. Since the partition wall seal 13 is in contact with the groove 24, the partition wall seal 13 is not rubbed and damaged by the end of the partition wall 6, and can be assembled without increasing the assembling insertion force, and the assembling workability can be improved.

  The assembled partition seal 13 is configured to have a multiple sealing function including the first and second outer seals 31 and 32 by the bead portion 25 and the semicircular groove 24 on the partition 6 side. The sealing performance with the seal 13 can be improved. Further, since the partition seal 13 is configured to have a multiple sealing function including the first and second inner seals 26 and 27 on the outer periphery of the base plate 12 of the control valve 7, the space between the base plate 12 and the partition seal 13 is also provided on this surface. Sealing performance can be improved. For this reason, it is possible to reliably prevent pressure leakage between the pair of intake air collecting portions 1A and 1B.

  In the present embodiment, the following effects can be achieved.

  (A) A control valve that opens and closes a port 17 serving as a passage through which a plurality of intake manifold portions 1A and 1B communicate with each other to collect the branch pipes 3 communicating with a cylinder group in which the ignition order of the internal combustion engine is not continuous. The base plate 12 having a port 17 that can be opened and closed of the control valve 7 is inserted into the manifold 2 that is a passage element that accommodates the control valve 7 from the insertion port, and is a structure of the outer periphery of the base plate 12 and the passage element. This is a seal structure of a variable intake device configured by interposing a seal member 13 with the partition wall 6, and a wall surface is provided on an end surface where the partition wall seal 13 that is a seal member of the partition wall 6 that is a component of the passage element contacts. A concave groove that is inclined to face each other, for example, a semicircular groove 24 is formed, and the height of the concave groove 24 on the outer periphery of the partition wall seal 13 disposed on the base plate 12 is A high center bead 28 and a low left and right bead 29 are formed along the shape, and the outer periphery of the base plate 12 is sealed by the contact between the tip of the center bead 28 and the left and right beads 29 and the bottom and wall surface of the groove 24 of the passage element. Like to do. For this reason, sealing performance can be improved by a multiple sealing function.

  Further, since the tip of the central bead 28 contacts the bottom of the concave groove 24, the tip of the left and right beads 29 contacts the wall surface of the concave groove 24, so that these beads 28, 29 follow the counterpart concave groove 24 during assembly. Therefore, the left and right beads 29 are set lower than the center bead 28, so that the right and left beads 29 can be prevented from falling outside during assembly.

  (A) A peripheral groove 21 is formed on the outer periphery of the base plate 12 along the outer peripheral surface, and the partition seal 13 as a seal member is fitted with a stopper 23 as an inward projection in the peripheral groove 21 so that the partition seal 13 Since the width of the circumferential groove 21 is held on the outer periphery of the base plate 12 and smaller than the width on both outer sides of the left and right beads 29 and larger than the width on both inner sides of the left and right beads 29, the lower surfaces of the left and right beads 29 are The sealing performance between the base plate 12 and the partition wall seal 13 can be improved by positively press-contacting the corner portion of the circumferential groove 21.

  (C) Since the height of the stopper 23 as an inward projection of the seal member 13 is formed lower than the depth of the circumferential groove 21 of the base plate 12, there is a gap between the bottom of the circumferential groove 21 and the partition wall seal 13, and the bead 28 Is pressed against the concave groove 24, the bottom surface of the sealing member 13 is first brought into contact with the bottom of the circumferential groove 21 to prevent the bottom surface of the left and right beads 29 and the corners of the circumferential groove 21 from being pressed, and the sealing performance is deteriorated. You can avoid that.

  (D) Since the outer periphery of the base plate 12 has a trapezoidal shape with a width that narrows from the insertion port toward the back side of the passage element, a seal is provided immediately before completion of insertion when the base plate 12 is inserted from the insertion port. The center bead 28 and the left and right beads 29 of the member 13 come into contact with the recessed grooves 24 of the opposing passage elements, and the seal member 13 and the base plate 12 are positioned while being guided by the recessed grooves 24 and the left and right beads 29. For this reason, it is possible to assemble the partition seal 13 while deforming it into the expected shape at the intended position, and the assembling accuracy and the assembling workability can be improved.

  (E) The structure of the passage element is the partition wall 6 obtained by separating the manifold 2 by the partition wall 6 to form a plurality of collecting portions 1A and 1B, and cutting out a part of the partition wall 6 including the case of the manifold 2. Since the concave groove 24 that engages with the seal member 13 on the outer periphery of the base plate 12 is formed on the end face, the control valve 7 can communicate and block the intake manifold portions 1A and 1B without using a passage element.

  In the above-described embodiment, the concave groove 21 has been described as a semicircular groove. However, although not illustrated, it may be a concave groove whose wall surfaces are inclined to face each other. The groove may have a triangular cross section.

  In the above-described embodiment, the control valve 7 includes the intake collecting portions 1A and 1B separated into a plurality by the partition wall 6. However, although not illustrated, the control valve 7 has a communication pipe that connects the intake collecting portions 1A and 1B. It may be a control valve to be arranged.

1 is a cross-sectional view of a variable intake device for an internal combustion engine to which a variable intake device seal structure according to an embodiment of the present invention is applied. Similarly, the A arrow view in FIG. The perspective view of a control valve. FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 3 showing a seal structure between the control valve and the passage structure.

Explanation of symbols

1A, 1B Inlet collecting part (collecting part)
2 Manifold 3 Branch manifold 4 Introduction pipe 5A, 5B Passage 6 Bulkhead 7 Control valve 10 Partition wall 12 Base plate 13 Bulkhead seal as seal member 17 Passage, valve hole 18 Valve body 21 Circumferential groove 22 Base portion 23 Stopper portion 24 As concave groove No. 25 semicircular groove 26 bead portion 26 first inner seal 27 second inner seal 28 center bead 29 left and right beads 31 first outer seal 32 second outer seal

Claims (5)

A plurality of collecting portions for collecting branch pipes communicating with a group of cylinders in which the ignition order of the internal combustion engine is not continuous; and a control valve for opening and closing a passage for communicating these collecting portions according to operating conditions, Is a seal structure of a variable intake device in which a base plate having an openable and closable port is inserted into a passage element from an insertion port and a seal member is interposed between the outer periphery of the base plate and a component of the passage element.
Forming a concave groove in which the wall surfaces are inclined to face each other at a site where the sealing member of the component of the passage element contacts;
Forming a high center bead and low left and right beads along the cross-sectional shape of the concave groove on the outer periphery of the seal member disposed on the base plate;
A seal structure for a variable intake device, wherein the outer peripheral portion of the base plate is sealed by contact between the front end portions of the center bead and the left and right beads of the seal member and the bottom and wall surfaces of the groove of the passage element.   A circumferential groove is formed on the outer circumference of the base plate along the outer circumferential surface, and the seal member is held on the outer circumference of the base plate by fitting an inward projection into the circumferential groove, and the width of the circumferential groove is set to both the left and right beads. The seal structure for a variable intake device according to claim 1, wherein the seal structure is smaller than an outer width and larger than both inner widths of the left and right beads.   The seal structure for a variable intake device according to claim 2, wherein the height of the inward projection of the seal member is lower than the depth of the circumferential groove of the base plate.   The outer periphery of the base plate is formed in a trapezoidal shape whose width becomes narrower from the insertion opening of the base plate toward the back side of the passage element. Variable intake system seal structure.   In the structure of the passage element, the manifold is separated by the partition wall to form a plurality of aggregate portions, and the end surface of the partition wall obtained by cutting out a part of the partition wall including the manifold case is engaged with the seal member on the outer periphery of the base plate. The seal structure for a variable intake device according to any one of claims 1 to 4, wherein the seal structure is formed by forming a concave groove.

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