JP2018013105A - Air bypass valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bypass valve which can inhibit deterioration of assemblability of a retainer member caused by reaction force of an outer seal member.SOLUTION: A movable side member 26 has a valve body 50. A coil spring 60 biases the movable side member 26 in a closing direction. An electromagnetic device 22 moves the movable side member 26 in an opening direction by electromagnetic attraction force. A retainer member 32 is provided at a casing 30 of a fixed side member 24 of the electromagnetic device 22. An inner seal member 66 forming a pressure equilibrium chamber 68 is provided between the retainer member 32 and the movable side member 26. An air bypass valve includes an outer seal member 56 which elastically seals a space between the casing 30 and a passage housing 10 and a space between the casing 30 and the retainer member 32. The retainer member 32 is temporarily held by the casing 30 so as to move in an axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air bypass valve that controls an amount of bypass air that flows through an intake bypass passage that bypasses a supercharger of an internal combustion engine.

  An air bypass valve of a conventional example (see Patent Document 1) will be described. FIG. 10 is a cross-sectional view showing the main part of the air bypass valve. As shown in FIG. 10, the stationary side member 202 of the air bypass valve 200 includes an annular retainer member 206 that surrounds the valve body 204. An annular inner seal member 208 is provided on the inner periphery of the retainer member 206. The inner seal member 208 elastically seals between the retainer member 206 and the valve body 204. A pressure equilibrium chamber 210 is formed between the retainer member 206 and the valve body 204. The stationary member 202 is installed on a passage forming member 212 that forms an intake bypass passage that bypasses the supercharger of the internal combustion engine. An outer seal member 214 made of an O-ring is provided on the lower surface of the fixed side member 202. The outer seal member 214 elastically seals between the stationary member 202 and the passage forming member 212, so that the air tightness of the intake bypass passage 216 is maintained. The retainer member 206 is attached to the fixed side member 202 by, for example, snap-fit engagement.

U.S. Pat. No. 8,387,383B2

  In the conventional example, in order to maintain the airtightness of the pressure equilibrium chamber 210, it is necessary to seal between the stationary member 202 and the retainer member 206. In this case, it is conceivable to form a flange portion 207 that projects to the outer peripheral side of the retainer member 206 and press the flange portion 207 against the outer seal member 214. Thereby, it is possible to seal between the members 202 and 206 without increasing the number of parts and the number of assembly steps. However, since the retainer member 206 receives the reaction force of the outer seal member 214, there remains a problem that the assembling property of the retainer member 206 is deteriorated. In addition, before the air bypass valve 200 is installed, there is a possibility that the retainer member 206 is displaced or dropped. The problem to be solved by the present invention is to provide an air bypass valve that can suppress a decrease in assembly performance of the retainer member due to a reaction force of the outer seal member.

  The above problem can be solved by the present invention. A first aspect of the present invention is an air bypass valve that controls an amount of bypass air that flows through an intake bypass passage that bypasses a supercharger of an internal combustion engine, and is a valve provided between an inflow passage and an outflow passage of the intake bypass passage A movable side member having a valve body that opens and closes the seat in the axial direction on the outflow path side, an elastic member that urges the movable side member in the closing direction, and a fixed side that is installed in a passage forming member that forms the intake bypass passage An electromagnetic device having a member and moving the movable side member in an opening direction against an urging force of the elastic member by an electromagnetic attractive force; and an annular retainer provided on the fixed side member and surrounding the movable side member A member, an annular inner seal member that forms a pressure equilibrium chamber between the retainer member and the movable side member, a pressure introduction passage that communicates the inflow passage and the pressure equilibrium chamber, and the fixed side portion And an annular outer seal member that elastically seals between the passage forming member and between the fixed side member and the retainer member, the air bypass valve having the fixed side It is an air bypass valve in which the retainer member is temporarily held so as to be movable in the axial direction. According to this configuration, the retainer member is temporarily held by the fixed member so as to be movable in the axial direction, so that the reaction force of the outer seal member received by the retainer member can be reduced or eliminated. Thereby, the assembly | attachment property of a retainer member can be improved. In addition, it is possible to improve the problem that the retainer member is displaced or dropped before the air bypass valve is installed. Further, in the installed state of the air bypass valve, the outer side sealing member can elastically seal between the fixed side member and the passage forming member and between the fixed side member and the retainer member. For this reason, the airtightness of the intake bypass passage and the pressure balance chamber can be maintained by the outer seal member.

  According to a second invention, in the first invention, the outer seal member includes a first seal portion that elastically seals between the fixed side member and the passage forming member in an axial direction, and the fixed side member. It is an air bypass valve which has the 2nd seal part which seals between the retainer members elastically in the direction of an axis. According to this configuration, the first seal portion of the outer seal member elastically seals between the fixed side member and the passage forming member, and the second seal portion elastically seals between the fixed side member and the retainer member. Can be sealed. For this reason, it is possible to easily manage the dimensions of both seal portions.

  In a third aspect based on the second aspect, the second seal portion of the outer seal member is formed with a seal convex portion capable of coming into contact with at least one of the fixed side member and the retainer member. It is an air bypass valve. According to this structure, the surface pressure of the seal convex part formed in the outer seal member can be improved, and the sealing performance can be improved.

  According to a fourth invention, in any one of the first to third inventions, the outer seal member is free in the axial direction between the retainer member temporarily held by the fixed member and the fixed member. It is an air bypass valve arranged in a state. According to this configuration, the reaction force of the outer seal member received by the retainer member can be eliminated.

  According to a fifth invention, in any one of the first to third inventions, the outer seal member is minute in the axial direction between the retainer member temporarily held by the fixed member and the fixed member. An air bypass valve arranged in a deformed state. According to this configuration, shakiness in the axial direction of the outer seal member and the retainer member can be suppressed by a minute reaction force of the outer seal member.

It is sectional drawing which shows the air bypass valve concerning Embodiment 1 in the installation state. It is sectional drawing which shows the seal structure of an air bypass valve. It is sectional drawing which shows the seal structure in the installation state of an air bypass valve. It is sectional drawing which shows the seal structure of the air bypass valve concerning Embodiment 2. It is sectional drawing which shows the seal structure in the installation state of an air bypass valve. It is sectional drawing which shows the seal structure of the air bypass valve concerning Embodiment 3. It is sectional drawing which shows the seal structure in the installation state of an air bypass valve. It is sectional drawing which shows the seal structure of the air bypass valve concerning Embodiment 4. It is sectional drawing which shows the seal structure in the installation state of an air bypass valve. It is sectional drawing which shows the principal part of the air bypass valve concerning a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1] In this embodiment, for example, a blow-off valve for controlling the amount of bypass air flowing through an intake bypass passage that bypasses a compressor of a supercharger disposed in an intake passage of an internal combustion engine (engine) such as a vehicle. An air bypass valve used as an example FIG. 1 is a sectional view showing an air bypass valve in an installed state. In FIG. 1, the air bypass valve is shown in a closed state. In addition, the orientation of the air bypass valve is determined up, down, left, and right with reference to FIG.

  As shown in FIG. 1, an intake bypass passage 12 is formed in the passage housing 10 of the supercharger in which the air bypass valve 20 is installed. The intake bypass passage 12 has an inflow passage 12a and an outflow passage 12b defined by a hollow cylindrical valve seat forming wall 14 extending in the vertical direction. The inflow passage 12a communicates with the intake passage on the upstream side of the compressor of the supercharger. The outflow passage 12b communicates with the intake passage on the downstream side of the compressor of the supercharger. The upper end surface of the valve seat forming wall 14 is an annular valve seat 15. On the upper wall 10a of the passage housing 10, a circular hole 16 is formed concentrically above the valve seat 15. The passage housing 10 corresponds to a “passage forming member” in this specification.

  The air bypass valve 20 is installed on the upper wall 10a of the passage housing 10 in a vertical state in which the opening / closing direction is the vertical direction. The air bypass valve 20 includes an electromagnetic device 22. The electromagnetic device 22 includes a fixed side member 24 that is fixedly installed in the passage housing 10, and a movable side member 26 that can be reciprocated in the axial direction (vertical direction) with respect to the fixed side member 24. .

  The stationary member 24 includes a casing 30, a retainer member 32, an outer yoke 34, an inner yoke 36, a coil 38, a stator core 40, an end plate member 42, and the like. The movable member 26 includes an armature 44, a connecting shaft 46, a valve body 50, a stopper plate 52, and the like. Hereinafter, it demonstrates in order.

  The casing 30 is made of resin and has a hollow cylindrical shape. The casing 30 covers the built-in members (the outer yoke 34, the inner yoke 36, the coil 38, the stator core 40, the end plate member 42, and the like). A flange-shaped attachment portion 30 a that protrudes outward in the radial direction is formed at the lower end portion of the casing 30. A cylindrical metal collar 54 is embedded in the attachment portion 30a. An annular outer seal member 56 made of rubber is provided on the inner peripheral portion of the attachment portion 30a. The lower end surface of the attachment portion 30 a is a plane that is orthogonal to the axis of the casing 30. The seal structure including the outer seal member 56 will be described later.

  The retainer member 32 is disposed in the lower end opening of the casing 30. The retainer member 32 is made of, for example, a resin and is formed in an annular shape surrounding the valve body 50 of the movable side member 26. A part (inner peripheral part) of the outer seal member 56 is disposed between the retainer member 32 and the casing 30.

  The outer yoke 34 is formed in a celestial cylindrical shape. The inner yoke 36 is disposed in the outer yoke 34. The inner yoke 36 is formed in a hollow cylindrical shape. At both end portions (upper and lower end portions) of the inner yoke 36, flange portions 34a projecting outward in the radial direction are formed. The coil 38 is housed in a cylindrical space between the outer yoke 34 and the inner yoke 36 while being wound around the bobbin 58.

  The stator core 40 is formed in a cylindrical shape. The stator core 40 is disposed in the upper part of the inner yoke 36. The end plate member 42 is formed in an annular plate shape. A cylindrical guide tube portion 42 a is formed on the inner peripheral portion of the end plate member 42. The end plate member 42 is disposed so as to close the lower surface opening of the cylindrical space between the outer yoke 34 and the inner yoke 36. The guide tube portion 42 a is fitted in the lower end portion of the inner yoke 36.

  The outer yoke 34, the inner yoke 36, the stator core 40, and the end plate member 42 are made of a magnetic material such as iron, and constitute a stator that forms a fixed-side magnetic circuit by energizing the coil 38. Yes. Energization of the coil 38 is controlled by a control device (not shown).

  The armature 44 is disposed in the guide tube portion 42a of the end plate member 42 so as to be reciprocally movable in the axial direction (vertical direction). The armature 44 is formed in a hollow cylindrical shape by a magnetic material such as iron and constitutes a mover. A coil spring 60 is interposed between the stator core 40 and the armature 44. The coil spring 60 urges the armature 44 downward. The coil spring 60 corresponds to an “elastic member” in this specification.

  The upper end portion of the connecting shaft 46 is inserted into and connected to the hollow portion of the armature 44. A spherical portion 46 a is formed at the lower end portion of the connecting shaft 46. The valve body 50 is made of, for example, a resin and has a bottomed cylindrical shape. The valve body 50 has a cylindrical cylindrical portion 50a and a bottom plate portion 50b that closes the lower surface opening of the cylindrical portion 50a. A cylindrical connecting portion 50c is formed on the center portion of the bottom plate portion 50b. The connecting portion 50c is slidably engaged with the spherical portion 46a of the connecting shaft 46. The outer peripheral portion of the bottom plate portion 50b projects radially outward from the cylindrical portion 50a, and is formed so as to be seated on the valve seat 15 of the passage housing 10 of the supercharger. A plurality of (two are shown in FIG. 1) communication holes 62 penetrating in the vertical direction are formed in the bottom plate portion 50b.

  The stopper plate 52 is made of, for example, a metal and is formed in an annular plate shape, and is fixedly attached to the upper end portion of the cylindrical portion 50 a of the valve body 50. The stopper plate 52 and the retainer member 32 are disposed so as to face each other in the axial direction (vertical direction). The interval between the stopper plate 52 and the retainer member 32 (that is, the annular gap in the axial direction) changes as the valve body 50 is opened and closed. A radial annular gap 64 is formed between the retainer member 32 and the cylindrical portion 50 a of the valve body 50.

  An annular inner seal member 66 made of rubber is attached to the cylindrical portion 50a of the valve body 50 in an outer fitting shape. The inner seal member 66 has a tapered seal lip portion 66a that gradually increases in diameter from the outer peripheral portion downward. The inner seal member 66 is positioned in the axial direction by the stepped portion of the cylindrical portion 50 a of the valve body 50 and the stopper plate 52.

  When the movable side member 26 is lowered (when the valve is closed), the seal lip 66a of the inner seal member 66 is elastically contacted with the retainer member 32, thereby sealing between the retainer member 32 and the valve body 50. The Accordingly, a sealed pressure equilibrium chamber 68 is formed between the fixed member 24 and the movable member 26. Further, the internal space of the valve body 50, the radial gap between the armature 44 and the cylindrical portion 50a of the valve body 50, and the axial gap between the casing 30 and the cylindrical portion 50a of the valve body 50 In addition, a pressure introduction passage 70 that communicates the internal space of the valve body 50 and the pressure equilibrium chamber 68 is formed. Further, when the movable side member 26 is raised (when the valve is opened), the seal lip portion 66a of the inner seal member 66 is separated from the retainer member 32, whereby the pressure balance chamber 68 is opened.

  The air bypass valve 20 configured as described above is installed on the passage housing 10 as follows. That is, the casing 30 is disposed on the upper wall 10 a so as to concentrically close the opening hole 16 of the passage housing 10. The attachment portion 30a of the casing 30 is fastened to the upper wall 10a of the passage housing 10 by bolts or the like. Accordingly, the valve body 50 is disposed so as to be movable in the axial direction (vertical direction) in the outflow passage 12 b of the intake bypass passage 12. Accordingly, the outer seal member 56 is provided between the upper wall 10a of the passage housing 10 and the mounting portion 30a of the casing 30 and between the upper wall 10a of the passage housing 10 and the outer peripheral side end of the retainer member 32. Elastically sealed. Thereby, the airtightness of the intake bypass passage 12 and the pressure equilibrium chamber 68 is maintained. The upper surface 10 b of the upper wall 10 a of the passage housing 10 is a plane that is orthogonal to the axis of the opening hole 16. The upper surface 10b corresponds to a “seal seat surface” in the present specification.

  Next, the operation of the air bypass valve 20 will be described. The air bypass valve 20 is closed when the electromagnetic device 22 is not energized (when energization is turned off) (see FIG. 1). That is, the movable member 26 is biased downward by the biasing force of the coil spring 60, so that the valve body 50 is seated on the valve seat 15 of the passage housing 10. In this state, the inflow passage 12a and the outflow passage 12b of the intake bypass passage 12 are blocked. Further, the seal lip portion 66 a of the inner seal member 66 elastically contacts the retainer member 32. As a result, the pressure equilibrium chamber 68 is blocked from the outflow passage 12 b of the intake bypass passage 12. Therefore, the air pressure in the inflow passage 12 a of the intake bypass passage 12 acts on the pressure equilibrium chamber 68 through the communication hole 62 and the internal space of the valve body 50 and the pressure introduction passage 70. As a result, the pressure difference between the inflow passage 12a and the pressure equilibrium chamber 68 is balanced, that is, canceled. For this reason, the urging force of the coil spring 60 and the electromagnetic attractive force of the electromagnetic device 22 can be reduced.

  The air bypass valve 20 is opened when the electromagnetic device 22 is energized (when energization is on). That is, the movable member 26 is moved upward against the biasing force of the coil spring 60 by the electromagnetic attractive force of the electromagnetic device 22, so that the valve body 50 is separated from the valve seat 15. In this state, the inflow passage 12a and the outflow passage 12b of the intake bypass passage 12 are communicated. Further, when the seal lip portion 66 a of the inner seal member 66 is separated from the retainer member 32, the pressure balance chamber 68 is opened with respect to the outflow passage 12 b of the intake bypass passage 12.

  Next, the main part structure in the air bypass valve 20, that is, the seal structure including the outer seal member 56 will be described. FIG. 2 is a cross-sectional view showing the seal structure of the air bypass valve, and FIG. 3 is a cross-sectional view showing the seal structure in the installed state. As shown in FIG. 2, two upper and lower stepped recesses 72 and 74 are formed concentrically on the lower surface side of the casing 30. The inner diameter of the stepped recess 74 on the lower side is larger than the inner diameter of the stepped recess 72 on the upper side. A step surface 75 between the stepped recess 72 on the upper stage side and the stepped recess 74 on the lower stage side is a plane perpendicular to the axis of the casing 30. An annular locking projection 76 is formed at the lower end of the inner peripheral wall surface of the stepped recess 72 on the upper side. The locking projection 76 is formed in a semicircular cross section. The inner peripheral wall surface of the upper stepped recess 72 and the inner peripheral wall surface of the lower stepped recess 74 are formed of a cylindrical surface centered on the axis of the casing 30. The step surface 75 corresponds to a “seal seat surface” in the present specification.

  The retainer member 32 includes an annular plate-shaped outer flange portion 78, a cylindrical connecting tube portion 80 extending downward from the inner peripheral portion of the outer flange portion 78, and a radially inward direction from the lower end portion of the connecting tube portion 80. It has an annular plate-like inner flange portion 82 that protrudes. The upper surface 78 a and the lower surface 78 b of the outer flange portion 78 are each made of a plane orthogonal to the axis of the retainer member 32. A seal lip portion 66 a (see FIG. 1) of the inner seal member 66 can come into contact with the inner flange portion 82. The upper surface 78a corresponds to a “seal seat surface” in this specification. The lower surface 78b corresponds to a “contact surface” in the present specification.

  A cylindrical engagement tube portion 84 extending upward is formed on the inner peripheral portion of the outer flange portion 78. The engagement cylinder portion 84 is formed so as to be elastically deformable inward in the radial direction (see a two-dot chain line 84 in FIG. 2). An annular engagement convex portion 86 is formed on the upper end portion of the outer peripheral surface of the engagement cylinder portion 84. The engaging projection 86 is formed in a semicircular cross section. The engagement cylinder portion 84 is fitted in a stepped recess 72 on the upper side of the casing 30. At this time, the engaging convex part 86 gets over the locking projection 76 of the stepped concave part 72 on the upper stage side by utilizing the elastic deformation of the engaging cylinder part 84 (see the two-dot chain line 84 in FIG. 2). A so-called snap-fit engagement is made with the locking projection 76. Thereby, the retainer member 32 is temporarily held by the casing 30 so as to be movable in the axial direction (vertical direction). Note that “temporary holding” as used in this specification refers to a state in which the retainer member 32 is held by the casing 30 so as to be movable in the axial direction (vertical direction) before being installed in the air bypass valve 20. Further, the locking projection 76 and the engaging convex portion 86 constitute “temporary holding means” in this specification.

  Prior to the temporary holding of the retainer member 32 with respect to the casing 30, an outer seal member 56 is disposed between the members 30 and 32 so as to be movable in the axial direction. In the temporary holding state of the retainer member 32, the outer seal member 56 is arranged in a free state in the axial direction (vertical direction) and the radial direction. In this state, the outer seal member 56 is partially fitted in the stepped recess 74 on the lower side of the casing 30.

  The outer seal member 56 is formed in an inverted L-shaped cross section with the outer peripheral portion being thick and the inner peripheral portion being thin. A thick-walled portion of the outer seal member 56 is an annular first seal portion 90. The thin portion of the outer seal member 56 is an annular second seal portion 92. The outer peripheral surface of the first seal portion 90 and the inner peripheral surface of the second seal portion 92 are cylindrical surfaces centering on the axis of the outer seal member 56. The outer peripheral surface of the first seal portion 90 is formed so as to be fitted to the inner wall surface of the stepped recess 74 on the lower side of the casing 30.

  The upper surface 56 a of the outer seal member 56 including both the seal portions 90, 92, the lower surface 90 a of the first seal portion 90, and the lower surface 92 a of the second seal portion 92 are each composed of a plane orthogonal to the axis of the outer seal member 56. . The upper surface 56 a of the outer seal member 56 faces the step surface 75 of the casing 30. Further, the lower surface 90 a of the first seal portion 90 faces the upper surface 10 b of the passage housing 10. Further, the lower surface 92 a of the second seal portion 92 faces the upper surface 78 a of the outer flange portion 78 of the retainer member 32. The upper surface 78a, the lower surface 90a, and the lower surface 92a correspond to “seal surfaces” in this specification.

  When the air bypass valve 20 is installed on the passage housing 10, the lower surface 78b of the outer flange portion 78 of the retainer member 32 comes into contact with the upper surface 10b of the passage housing 10, and the casing 30 is lowered from this state. Accordingly, the retainer member 32 is moved upward relative to the casing 30. Subsequently, the attachment portion 30a of the casing 30 is fastened to the upper wall 10a of the passage housing 10 by bolts or the like. Thereby, the lower surface of the attachment portion 30a of the casing 30 is brought into contact with the upper surface 10b of the passage housing 10 in a surface contact manner.

  As a result, as shown in FIG. 3, the first seal portion 90 of the outer seal member 56 is sandwiched between the facing surfaces 10 b and 75 of the passage housing 10 and the casing 30 using elastic deformation. As a result, the space between the passage housing 10 and the casing 30 is elastically sealed by the first seal portion 90.

  Further, the second seal portion 92 of the outer seal member 56 is sandwiched between the opposing surfaces 75 and 78a of the casing 30 and the outer flange portion 78 of the retainer member 32 using elastic deformation. Thereby, the space between the casing 30 and the outer flange portion 78 of the retainer member 32 is elastically sealed by the second seal portion 92.

  According to the air bypass valve 20 described above, the retainer member 32 is temporarily held in the casing 30 of the stationary member 24 so as to be movable in the axial direction (see FIG. 2). For this reason, the reaction force of the outer seal member 56 received by the retainer member 32 can be eliminated. Thereby, the assembly property of the retainer member 32 can be improved. In addition, the problem that the retainer member 32 is displaced or dropped before the air bypass valve 20 is installed can be improved.

  Further, in the installed state of the air bypass valve 20 (see FIG. 3), the outer seal member 56 is elastic between the casing 30 of the stationary member 24 and the passage housing 10 and between the casing 30 and the retainer member 32. Can be sealed. For this reason, the airtightness of the intake bypass passage 12 and the pressure equilibrium chamber 68 can be maintained by the outer seal member 56.

  Further, the outer seal member 56 is axially connected between the first seal portion 90 that elastically seals between the casing 30 of the stationary member 24 and the passage housing 10 in the axial direction, and between the casing 30 and the retainer member 32. And a second seal portion 92 that seals elastically. Therefore, the first seal portion 90 of the outer seal member 56 can elastically seal between the casing 30 and the passage housing 10. Further, the second seal portion 92 can elastically seal between the casing 30 and the retainer member 32. For this reason, the dimension management of both the seal parts 90 and 92 can be performed easily.

  In addition, an outer seal member 56 is disposed in a free state in the axial direction between the retainer member 32 temporarily held in the casing 30 and the casing 30. Therefore, the reaction force of the outer seal member 56 received by the retainer member 32 can be eliminated. Note that the second seal portion 92 of the outer seal member 56 may be disposed in the axial direction in a minute deformation state between the retainer member 32 temporarily held in the casing 30 and the casing 30. In this case, the backlash in the axial direction of the outer seal member 56 and the retainer member 32 can be suppressed by a minute reaction force of the outer seal member 56.

[Embodiment 2] Since Embodiment 2 is a modification of the outer seal member 56 (see FIG. 2) of Embodiment 1, the changed portion will be described and redundant description will be omitted. FIG. 4 is a cross-sectional view showing the seal structure of the air bypass valve, and FIG. 5 is a cross-sectional view showing the seal structure in the installed state. As shown in FIG. 4, the outer seal member (indicated by reference numeral 94) of the present embodiment has a quadrangular cross section, and an engagement groove 96 having a square groove shape that opens inward in the radial direction on the inner peripheral portion thereof. Is formed. An outer flange portion 78 of the retainer member 32 is engaged with the engagement groove 96. The upper surface 78a and the lower surface 78b of the outer flange portion 78 correspond to a “seal seat surface” in this specification.

  The outer peripheral portion of the outer seal member 94 is an annular first seal portion 98. The inner peripheral portion of the outer seal member 94 is an annular upper and lower pair of second seal portions 100 and 102. The outer peripheral surface of the first seal portion 98 is formed so as to be fitted to the inner wall surface of the stepped recess 74 on the lower side of the casing 30. The outer peripheral surface of the first seal portion 98 and the inner peripheral surfaces of both the second seal portions 100 and 102 are respectively cylindrical surfaces centering on the axis of the outer seal member 94.

  The upper surface 94 a and the lower surface 94 b of the outer seal member 94 are each formed of a plane orthogonal to the axis of the outer seal member 94. The upper surface 94 a faces the step surface 75 of the casing 30, and the lower surface 94 b faces the upper surface 10 b of the passage housing 10. In addition, the lower surface 100 a of the upper second seal portion 100 and the upper surface 102 a of the lower second seal portion 102 are each made of a plane orthogonal to the axis of the outer seal member 94. The lower surface 100 a faces the upper surface 78 a of the outer flange portion 78 of the retainer member 32, and the upper surface 102 a faces the lower surface 78 b of the outer flange portion 78. Note that the upper surface 94a, the lower surface 94b, the lower surface 100a, and the upper surface 102a correspond to “seal surfaces” in this specification, respectively.

  As shown in FIG. 5, in the installed state of the casing 30 with respect to the passage housing 10, the first seal portion 98 of the outer seal member 94 utilizes elastic deformation between the facing surfaces 10 b and 75 of the passage housing 10 and the casing 30. It is pinched. Thereby, the space between the passage housing 10 and the casing 30 is elastically sealed by the first seal portion 98.

  In addition, the second seal portion 100 on the upper side of the outer seal member 94 is sandwiched between the opposing surfaces 75 and 78a of the casing 30 and the outer flange portion 78 of the retainer member 32 using elastic deformation. As a result, the space between the casing 30 and the outer flange portion 78 of the retainer member 32 is elastically sealed by the upper second seal portion 100.

  Further, the second seal portion 102 on the lower side of the outer seal member 94 is sandwiched between the facing surfaces 10b and 78b of the passage housing 10 and the outer flange portion 78 by utilizing elastic deformation. Accordingly, the space between the passage housing 10 and the outer flange portion 78 is elastically sealed by the lower second seal portion 102.

  According to the present embodiment, the outer flange portion 78 of the retainer member 32 is engaged with the engagement groove 96 of the outer seal member 94 in the temporary holding state of the retainer member 32 (see FIG. 2). Shaking of the outer seal member 94 can be suppressed.

[Third Embodiment] Since the third embodiment is a modification of the outer seal member 56 (see FIG. 2) of the first embodiment, the changed portion will be described, and a duplicate description will be omitted. FIG. 6 is a cross-sectional view showing the seal structure of the air bypass valve, and FIG. 7 is a cross-sectional view showing the seal structure in the same installed state. As shown in FIG. 6, the outer seal member (denoted by reference numeral 104) of the present embodiment is gradually reduced in diameter from the annular first seal portion 106 and the inner peripheral portion of the first seal portion 106 downward. And a second seal portion 108 made of a tapered seal lip. The first seal portion 106 is formed in a vertically long rectangular cross section.

  The outer peripheral surface and the inner peripheral surface of the first seal portion 106 are formed of a cylindrical surface centered on the axis of the outer seal member 104. The outer peripheral surface of the first seal portion 106 is formed so as to be fitted to the inner wall surface of the stepped recess 74 on the lower side of the casing 30. Each of the upper surface 106 a and the lower surface 106 b of the first seal portion 106 is a plane that is orthogonal to the axis of the outer seal member 104. The upper surface 106 a faces the step surface 75 of the casing 30. Further, the lower surface 106 b faces the upper surface 10 b of the passage housing 10. Further, the distal end portion of the second seal portion 108 is in close contact or lightly with the outer flange portion 78 of the retainer member 32. The top surface 106a, the bottom surface 106b, and the front end surface of the second seal portion 108 facing the outer flange portion 78 correspond to the “seal surface” in this specification.

  As shown in FIG. 7, in the installed state of the casing 30 with respect to the passage housing 10, the first seal portion 106 of the outer seal member 104 utilizes elastic deformation between the facing surfaces 10 b and 75 of the passage housing 10 and the casing 30. It is pinched. As a result, the space between the passage housing 10 and the casing 30 is elastically sealed by the first seal portion 106.

  Further, the distal end portion of the second seal portion 108 is brought into close contact with the outer flange portion 78 of the retainer member 32 using elastic deformation. Thereby, the space between the casing 30 and the outer flange portion 78 of the retainer member 32 is elastically sealed by the second seal portion 108.

[Embodiment 4] Since Embodiment 4 is a modification of the outer seal member 56 (see FIG. 2) of Embodiment 1, the changed portion will be described, and duplicate description will be omitted. FIG. 8 is a sectional view showing the seal structure of the air bypass valve, and FIG. 9 is a sectional view showing the seal structure in the installed state. As shown in FIG. 8, the outer seal member (denoted by reference numeral 110) of the present embodiment is located above and below the first seal portion 90 and the second seal portion 92 of the outer seal member 56 (see FIG. 2) of the first embodiment. The upper and lower seal projections 112 that are annular on both sides are formed symmetrically in the vertical direction. The seal protrusion 112 is formed in an annular shape centering on the axis of the outer seal member 110. The seal protrusion 112 is formed in a semicircular cross section.

  In the temporary holding state of the retainer member 32 (see FIG. 8), both seal projections 112 on the upper surface side of the outer seal member 110 are brought into contact with the step surface 75 of the casing 30 in a slightly deformed state. At the same time, the seal convex portion 112 on the lower surface side of the second seal portion 92 is in contact with the upper surface 78a of the outer flange portion 78 of the retainer member 32 in a minute deformation state. Therefore, shakiness in the axial direction of the outer seal member 110 and the retainer member 32 can be suppressed by a minute reaction force of the outer seal member 110.

  Further, as shown in FIG. 9, in the installed state of the casing 30 with respect to the passage housing 10, the tip ends (upper end portions) of both the seal convex portions 112 on the upper side of the outer seal member 104 are elastically applied to the step surface 75 of the casing 30. Abut. Further, the tip (lower end) of the lower seal projection 112 of the first seal portion 90 abuts elastically on the upper surface 10 a of the passage housing 10. Further, the tip (lower end) of the lower seal convex portion 112 of the second seal portion 92 elastically contacts the upper surface 78 a of the outer flange portion 78 of the retainer member 32. Therefore, the surface pressure of each seal projection 112 formed on the outer seal member 110 can be improved, and the sealing performance can be improved.

  Note that one of the upper and lower seal projections 112 of the first seal portion 90 may be omitted or formed in a multiple ring shape. In addition, any one of the upper and lower seal projections 112 of the second seal portion 92 may be omitted or formed in a multiple ring shape.

[Other Embodiments] The present invention is not limited to the embodiments and can be modified without departing from the gist of the present invention. For example, the inner seal member 66 may be provided on the retainer member 32 as in the conventional inner seal member 208 (see FIG. 10). Further, the cross-sectional shape of the inner seal member 66 may be changed as appropriate. For example, as the cross-sectional shape of the inner seal member 66, the cross-sectional shape of the inner seal member 208 (see FIG. 10) of the conventional example may be applied.

10: Passage housing (passage forming member)
12 ... Intake bypass passage 12a ... Inflow passage 12b ... Outlet passage 15 ... Valve seat 20 ... Air bypass valve 22 ... Electromagnetic device 24 ... Fixed side member 26 ... Movable side member 30 ... Casing 32 ... Retainer member 50 ... Valve body 56 ... Outside Seal member 60 ... Coil spring (elastic member)
66 ... Inner seal member 68 ... Pressure equilibrium chamber 70 ... Pressure introduction passage 90 ... First seal portion 92 ... Second seal portion 94 ... Outer seal member 98 ... First seal portion 100, 102 ... Second seal portion 104 ... Outer seal Member 106 ... 1st seal part 108 ... 2nd seal part 110 ... Outer seal member 112 ... Seal convex part

Claims (5)

An air bypass valve that controls an amount of bypass air flowing through an intake bypass passage that bypasses a supercharger of an internal combustion engine,
A movable side member having a valve body for opening and closing a valve seat provided between the inflow path and the outflow path of the intake bypass passage in the outflow path side; and
An elastic member for urging the movable side member in the closing direction;
An electromagnetic device having a fixed side member installed in a passage forming member forming the intake bypass passage and moving the movable side member in an opening direction against an urging force of the elastic member by an electromagnetic attractive force;
An annular retainer member provided on the fixed side member and surrounding the movable side member;
An annular inner seal member forming a pressure equilibrium chamber between the retainer member and the movable member;
A pressure introduction passage communicating the inflow passage and the pressure equilibrium chamber;
An annular outer seal member that elastically seals between the fixed side member and the passage forming member and between the fixed side member and the retainer member;
An air bypass valve comprising:
An air bypass valve in which the retainer member is temporarily held by the stationary member so as to be movable in the axial direction. The air bypass valve according to claim 1,
The outer seal member is elastic in the axial direction between the first seal portion that elastically seals between the fixed side member and the passage forming member in the axial direction, and between the fixed side member and the retainer member. And an air bypass valve having a second seal portion for sealing. The air bypass valve according to claim 2,
An air bypass valve, wherein a seal convex portion capable of contacting at least one of the fixed side member and the retainer member is formed on the second seal portion of the outer seal member. The air bypass valve according to any one of claims 1 to 3,
An air bypass valve, wherein the outer seal member is disposed in a free state in the axial direction between the retainer member temporarily held by the fixed member and the fixed member. The air bypass valve according to any one of claims 1 to 3,
An air bypass valve in which the outer seal member is arranged in a minutely deformed state in the axial direction between the retainer member temporarily held by the fixed member and the fixed member.

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