JP2015075120A - Electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic valve which can prevent the generation of fluid leakage at valve-closing.SOLUTION: An air bypass valve 20 comprises: an electromagnetic device 22 having a fixed-side member 30, a movable-side member 32 which is moved to a suction direction by an electromagnetic force, and a coil spring which energizes the movable-side member 32 to a direction opposite to the suction direction; a valve member 24 which is connected to the movable-side member 32, and opens and closes a valve seat 15 of an intake bypass passage 12 of a casing 10; a diaphragm 26 which is laid between the fixed-side member 30 and the valve member 24, and forms a pressure equilibrium chamber 84 which is partitioned with respect to a flow-out passage 14 at a downstream side of the intake bypass passage 12 at valve-closing; and pressure introduction passages 28 which are formed at the movable-side member 32 and the valve member 24, and make a flow-in passage 13 at an upstream side of the intake bypass passage 12 and the pressure equilibrium chamber 84 communicate with each other at valve-closing. The diaphragm 26 is attached to the valve member 24 in a sealed state, and the valve member 24 is connected to the movable-side member 32 so as to be tiltable.

Description

  The present invention relates to a solenoid valve.

As a conventional example of an electromagnetic valve, for example, an air bypass valve that controls the amount of bypass air flowing through an intake bypass passage that bypasses a turbocharger of an internal combustion engine, there is one described in Patent Document 1, for example. An air bypass valve of a conventional example (Patent Document 1) will be described. FIG. 9 is a cross-sectional view showing the periphery of the valve member of the air bypass valve.
As shown in FIG. 9, the air bypass valve 100 includes an electromagnetic device 102, a valve member 104, a diaphragm 106, and a pressure introduction passage 108. The electromagnetic device 102 includes a fixed side member 110, a movable side member 112 that is moved in the suction direction by electromagnetic force, and a coil spring 114 that biases the movable side member 112 in a direction opposite to the suction direction. Yes. The valve member 104 is connected to the movable member 112 of the electromagnetic device 102 and opens and closes a valve seat 120 provided in the middle of the intake bypass passage 118 of the turbocharger casing 116.

  The diaphragm 106 is installed between the stationary member 110 of the electromagnetic device 102 and the valve member 104, and is partitioned with respect to the outflow passage 118b downstream of the valve seat 120 of the intake bypass passage 118 when the valve is closed. A pressure equilibrium chamber 122 is formed. Further, the pressure introduction passage 108 is formed in the movable side member 112 and the valve member 104 of the electromagnetic device 102, and when the valve is closed, the pressure introduction passage 108 has an inflow passage 118a upstream of the valve seat 120 of the intake bypass passage 118 and the pressure equilibrium chamber 122. Communicate.

  In the air bypass valve 100, when no electromagnetic force is generated in the electromagnetic device 102, that is, when no power is supplied, the valve member 104 is seated on the valve seat 120 by the urging force of the coil spring 114 and is closed. When the electromagnetic force is generated in the electromagnetic device 102, that is, when energized, the valve member 104 is moved against the urging force of the coil spring 114 together with the movable member 112 attracted by the electromagnetic force. 104 separates from the valve seat 120 and opens.

  By the way, when the valve is closed, the air pressure in the inflow passage 118 a of the intake bypass passage 118 acts on the pressure equilibrium chamber 122 via the pressure introduction passage 108. For this reason, the pressure of the air applied to the inflow path 118a side of the intake bypass passage 118 and the pressure equilibrium chamber 122 side is balanced, that is, the difference between the inflow path 118a side of the intake bypass path 118 and the pressure equilibrium chamber 122 side. Pressure is cancelled. Thereby, the urging force of the coil spring 114 and the electromagnetic force of the electromagnetic device 102 can be reduced.

JP 2013-83339 A

  According to the conventional example, the movable core 112 is fitted with the diaphragm 106, the stopper plate 126 of the valve member 104, the holder 128 and the retaining ring 130 on the movable side member 112 (specifically, the movable core 124) of the electromagnetic device 102. The front end portion (lower end portion) of 124 is caulked. Thus, the inner peripheral portion of the diaphragm 106 is attached in a sealed state between the stopper plate 126 of the valve member 104 and the holder 128, and the movable core 124 and the valve member 104 are fixedly integrated. .

  Further, a tilt between the valve seat 120 and the valve member 104 is caused by manufacturing errors and assembly errors of the respective components of the air bypass valve 100, manufacturing errors of the casing 116, errors in mounting the air bypass valve 100 with respect to the casing 116, and the like. Directional misalignment may occur. In this case, the close contact (sealability) of the valve member 104 with respect to the valve seat 120 is lowered, and air leakage (fluid leakage) occurs. In this specification, “fluid leakage (air leakage)” refers to the relationship between the upstream passage portion (inflow passage 118a) and the downstream passage portion (outflow passage 118b) of the fluid passage (intake bypass passage 118). This refers to fluid (air) leakage that occurs in between. In addition, the “axial displacement in the tilt direction” in this specification refers to an axial displacement in which the axis of the valve seat and the axis of the valve member are inclined.

  Further, as a measure for preventing the occurrence of air leakage when the valve is closed, a predetermined gap is provided between the opposed surfaces of the movable core 124 and the retaining ring 130 so that the valve member 104 can be tilted with respect to the movable core 124. It is conceivable to provide it. However, a gap is generated between the diaphragm 106 and the valve member 104 (the stopper plate 126 and the holder 128), and air leakage occurs, which is not practical.

  The problem to be solved by the present invention is to provide an electromagnetic valve capable of preventing the occurrence of fluid leakage when the valve is closed.

According to a first aspect of the present invention, there is provided an electromagnetic device including a fixed side member, a movable side member that is moved in an attraction direction by an electromagnetic force, and an elastic member that biases the movable side member in a direction opposite to the attraction direction. A valve member connected to the movable side member of the device and opening and closing a valve seat provided in the middle of the fluid passage of the fluid passage forming member, and is erected between the fixed side member and the valve member of the electromagnetic device. A diaphragm that forms a pressure balancing chamber defined with respect to a passage portion downstream of the valve seat of the fluid passage, and a movable side member and a valve member of the electromagnetic device are formed. A solenoid valve having a pressure introducing passage communicating with the upstream passage portion and the pressure equilibrium chamber, wherein a diaphragm is attached to the valve member in a sealed state so that the valve member can be tilted with respect to the movable member of the electromagnetic device. Concatenated.
According to this configuration, the valve member to which the diaphragm is attached in a sealed state is connected to the movable side member of the electromagnetic device so as to be tiltable. For this reason, even when an axial deviation in the inclination direction occurs between the valve seat and the valve member, the valve member tilts with respect to the movable side member of the electromagnetic device when the valve is closed, so that the valve member is moved to the valve seat. Is aligned. Thereby, the adhesiveness (sealability) of the valve member when the valve is closed with respect to the valve seat can be improved.
Further, since the diaphragm is attached to the valve member in a sealed state, no air leakage occurs between the diaphragm and the valve member. In addition, by connecting the valve member to the movable side member of the electromagnetic device in a tiltable manner, a gap is created between the movable side member and the valve member. The gap is a passage portion on the upstream side of the pressure equilibrium chamber and the fluid passage. There is no problem just by communicating with.
Therefore, it is possible to prevent the occurrence of air leakage when the valve is closed by improving the adhesion (sealability) of the valve member when the valve is closed and the mounting of the diaphragm with respect to the valve member in a sealed state. Can do.

  In a second aspect based on the first aspect, the valve member includes a pair of shell members that sandwich the diaphragm over the entire circumference and are connected to the movable side member of the electromagnetic device so as to be tiltable. . According to this configuration, the diaphragm can be attached to the valve member in a sealed state by sandwiching the diaphragm over the entire circumference by the pair of shell members provided in the valve member. Further, the valve member can be tiltably connected to the movable side member of the electromagnetic device by the pair of shell members.

  In a third aspect of the invention, the solenoid valve of the first or second aspect of the invention is an air bypass valve that controls the amount of bypass air flowing through the intake bypass passage that bypasses the turbocharger of the internal combustion engine. According to this configuration, the electromagnetic valve can be used as an air bypass valve that controls the amount of bypass air that flows through the intake bypass passage that bypasses the turbocharger of the internal combustion engine.

It is a front sectional view showing an air bypass valve according to an embodiment. It is a sectional side view which shows an air bypass valve. It is a front sectional view showing the peripheral part of the valve member of the air bypass valve. It is a front sectional view showing a movable body. It is sectional drawing which decomposes | disassembles and shows a movable body. It is a top view which shows a diaphragm subassembly. It is a front sectional view showing a diaphragm subassembly. It is a front sectional view showing a movable body subassembly. It is sectional drawing which shows the peripheral part of the valve member of the air bypass valve concerning a prior art example.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. The electromagnetic valve of the present embodiment is implemented as an air bypass valve as a blow-off valve that controls the amount of bypass air flowing through an intake bypass passage that bypasses a turbocharger of an internal combustion engine (engine) such as a vehicle. 1 is a front sectional view showing an air bypass valve, FIG. 2 is a sectional side view, and FIG. 3 is a front sectional view showing a peripheral portion of the valve member. 1 and 3 are shown in a closed state, and FIG. 2 is shown in an opened state. For convenience of explanation, the upper, lower, left, and right sides of the air bypass valve are determined based on FIG. 1, but the arrangement direction of the air bypass valve is not specified.

  As shown in FIG. 1, an intake bypass passage 12 is formed in a casing 10 of a turbocharger (not shown). Although not shown, the compressor of the turbocharger is disposed in the intake passage of the internal combustion engine (engine). The intake bypass passage 12 is a passage that bypasses the compressor of the turbocharger in the intake passage. A hollow cylindrical valve chamber 17 is formed in the intake bypass passage 12. The upper end surface of the valve chamber 17 is opened.

  A hollow cylindrical inflow passage 13 is formed concentrically on the lower wall of the valve chamber 17. An annular valve seat 15 protruding on the lower wall of the valve chamber 17 is formed at the upper end opening of the inflow passage 13. A hollow cylindrical outflow passage 14 is formed on the side wall of the valve chamber 17. The inflow passage 13 communicates with an intake passage (not shown) on the upstream side of the turbocharger compressor. Further, the inflow passage 13 communicates with an intake passage (not shown) on the downstream side of the compressor of the turbocharger. The casing 10 corresponds to a “fluid passage forming member” and an “intake bypass passage forming member” in this specification. The intake bypass passage 12 corresponds to a “fluid passage” in this specification. The inflow passage 13 corresponds to the “upstream passage portion” in this specification. The outflow passage 14 corresponds to a “downstream passage portion” in the present specification. The valve chamber 17 forms a part of the outflow passage 14.

  An air bypass valve 20 is installed on the casing 10. The air bypass valve 20 is arranged in a vertical orientation in which the opening / closing direction is the vertical direction (vertical direction). The air bypass valve 20 includes an electromagnetic device 22, a valve member 24, a diaphragm 26, a pressure introduction passage 28, and the like. The electromagnetic device 22 includes a movable side member 32 that is moved in the suction direction by an electromagnetic force with respect to the fixed side member 30, and a coil spring 34 that biases the movable side member 32 in a direction opposite to the suction direction. Yes.

  The stationary member 30 includes a coil 36, a stationary core 38, an end plate member 40, a yoke 42, a housing 44, and the like. The coil 36 is made of a conductive wire with an insulating film, and is housed in a housing 44 while being wound around a bobbin 37 made of synthetic resin having insulation properties. The fixed core 38 is formed in a hollow cylindrical shape by a magnetic material such as iron and is disposed in the upper part of the hollow portion of the bobbin 37. A guide shaft 39 is fitted in the hollow portion of the fixed core 38. A lower portion of the guide shaft 39 protrudes downward from the fixed core 38.

  As shown in FIG. 3, the end plate member 40 is formed of a magnetic material such as iron, and has a cylindrical tube portion 40a and an end plate portion that protrudes radially outward from the lower end portion of the tube portion 40a in a flange shape. 40b. The cylindrical portion 40 a is fitted in the lower end portion of the bobbin 37. The end plate portion 40 b is in contact with the lower end surface of the bobbin 37.

  As shown in FIG. 2, the yoke 42 is formed of a magnetic material such as iron, and includes an annular plate-like end plate portion 42a and a pair of side plate portions 42b extending downward from both front and rear side portions of the end plate portion 42a. Have. A bobbin 37 is accommodated in the yoke 42. The end plate portion 42 a is in contact with the upper end surface of the bobbin 37 and is fitted to the upper end portion of the fixed core 38. Both side plate portions 42 b cover the front and rear side portions of the bobbin 37. The both side plate portions 42 b are formed in a circular cross-sectional arc shape that follows the front and rear side portions of the bobbin 37. Further, the lower end portions of the both side plate portions 42 b are engaged with the outer end portions of the end plate portions 40 b of the end plate members 40. The fixed core 38, the end plate member 40, and the yoke 42 described above constitute a stator, and a magnetic circuit on the fixed side is formed by energizing the coil 36.

As shown in FIG. 1, the housing 44 is made of a resin having an insulating property and is formed in a cylindrical shape. The housing 44 covers the upper surface and side surfaces of the stator (the coil 36, the fixed core 38, the end plate member 40, and the yoke 42) by resin molding.
As shown in FIG. 3, a holding portion 44 a that protrudes radially inward in a flange shape is integrally formed at the lower end portion of the housing 44. The holding portion 44 a covers the lower surface of the bobbin 37 and the end plate portion 40 b of the end plate member 40, and holds the bobbin 37 and the end plate member 40 in a fixed manner in the housing 44. Further, a mounting flange portion 44b that protrudes radially outward is formed integrally with the lower end portion of the housing 44.

  As shown in FIG. 1, a connector portion 46 is formed at the upper end portion of the side surface of the housing 44. The connector portion 46 is provided with a pair of terminals 47 (only one side is shown in FIG. 1). Both terminals of the coil 36 are connected to both terminals 47. The connector 46 is connected to an external connector connected to a control device (ECU) (not shown). Energization of the coil 36 is controlled by the control device.

The movable member 32 includes a movable core 50 as a mover. The movable core 50 is assembled as a movable body 53 (described later) together with a diaphragm 26 and a valve member 24 described later, and then is assembled to the fixed member 30. 4 is a front sectional view showing the movable body, and FIG. 5 is an exploded sectional view showing the movable body.
As shown in FIG. 5, the movable core 50 is formed in a hollow cylindrical shape by a magnetic material such as iron. At the lower end portion of the movable core 50, a large-diameter cylindrical portion 50a and a small-diameter cylindrical portion 50b that reduce the outer diameter stepwise are formed. The small-diameter cylindrical portion 50b is formed in a right cylindrical shape before attachment of a diaphragm subassembly 62 (described later). On the upper side of the large-diameter cylindrical portion 50a of the movable core 50, an appropriate number (two in FIG. 5) of horizontal holes 52 penetrating in the radial direction are formed at equal intervals in the circumferential direction. The lateral hole 52 communicates with the hollow portion 51 of the movable core 50. Further, the hollow portion 51 of the movable core 50 is fitted to the guide shaft 39 of the fixed side member 30 so as to be capable of reciprocating in the axial direction, that is, in the vertical direction (see FIG. 1). Note that the movable core 50 is fitted to the hollow portion of the end plate member 40 and the hollow portion of the holding portion 44a of the housing 44 so as to be reciprocally movable in the vertical direction.

  As shown in FIG. 1, the coil spring 34 is interposed between the fixed core 38 and the movable core 50 while being fitted to the guide shaft 39 when the movable core 50 is assembled to the fixed member 30. ing. The coil spring 34 biases the movable core 50 away from the fixed core 38, that is, in the direction opposite to the suction direction (downward in FIG. 1). The lower portion of the hollow portion of the fixed core 38 is formed in a stepped hole shape that increases the inner diameter, and the upper end portion of the coil 36 spring 34 is accommodated in the lower portion, and the coil 36 is formed on the stepped surface. The upper end surface of the spring 34 is in contact. The upper end portion of the hollow portion of the movable core 50 is formed in a stepped hole shape that increases the inner diameter, and the lower end portion of the coil 36 spring 34 is accommodated in the upper end portion, and the coil is formed on the stepped surface. The lower end surface of the 36 spring 34 is in contact. The coil spring 34 corresponds to an “elastic member” in this specification.

  In the electromagnetic device 22, when no electromagnetic force is generated, that is, when energization of the coil 36 is turned off (non-energization), the moving core 50 is pulled from the fixed core 38 by the biasing force of the coil spring 34. It is biased in the opposite direction, that is, downward (see FIG. 1). Further, when electromagnetic force is generated in the electromagnetic device 22, that is, when energization of the coil 36 is on (when energization is performed), the movable core 50 resists the biasing force of the coil spring 34 by the electromagnetic force and moves in the suction direction, that is, upward. Aspirated (see FIG. 2).

As shown in FIG. 3, the valve member 24 is connected to the movable core 50 of the movable side member 32 of the electromagnetic device 22 and opens and closes the valve seat 15 of the intake bypass passage 12 of the casing 10. The movable member 53 (see FIG. 4) is configured by connecting the valve member 24 to the movable core 50.
As shown in FIG. 5, the valve member 24 includes a valve plate 55, a holder 57, a stopper plate 59, and the like. A diaphragm subassembly 62 (see FIGS. 6 and 7) is configured by sandwiching the inner peripheral portion of the diaphragm 26 between the holder 57 and the stopper plate 59. FIG. 6 is a plan view showing the diaphragm subassembly, and FIG. 7 is a front sectional view of the same.

  As shown in FIG. 5, the diaphragm 26 is a diaphragm with a base fabric formed by embedding a base fabric in a rubber-like elastic membrane member made of resin. The diaphragm 26 is formed in a disc shape, and includes an inner peripheral mounting plate portion 26a, an outer peripheral mounting plate portion 26b, and a deforming portion 26c formed between the two mounting plate portions 26a and 26b. Concentric. A circular mounting hole 27 is formed concentrically at the center of the inner peripheral mounting plate portion 26a. Further, a bulging portion 26d having a quadrangular cross section is formed on the outer peripheral portion of the mounting plate portion 26b on the outer peripheral side.

  The stopper plate 59 is made of a metal press-molded product such as stainless steel. The stopper plate 59 is formed in an annular plate shape having a circular mounting hole 60 at the center. The attachment hole 60 of the stopper plate 59 and the attachment hole 27 of the diaphragm 26 are formed with the same or substantially the same hole diameter. The stopper plate 59 is formed with an outer diameter that is larger than the outer diameter of the mounting plate portion 26a on the inner peripheral side of the diaphragm 26 and smaller than the inner diameter of the mounting plate portion 26b on the outer peripheral side.

  The holder 57 is made of a press-formed product made of metal such as stainless steel. The holder 57 is formed in a three-stepped cylindrical shape, and has a small-diameter cylindrical portion 64, a small-diameter stepped portion 65, an intermediate-diameter cylindrical portion 66, a large-diameter stepped portion 67, and a large-diameter cylindrical portion 68. . The small-diameter cylindrical portion 64 has a right cylindrical shape before the diaphragm 26 is attached, and is formed in a wave shape having convex portions 64a and concave portions 64b alternately in the circumferential direction. The small diameter cylindrical portion 64 is formed so as to be able to fit into the mounting hole 27 of the diaphragm 26 and the mounting hole 60 of the stopper plate 59. Further, the small diameter step portion 65 is formed in an annular plate shape between the lower end portion of the small diameter cylindrical portion 64 and the upper end portion of the medium diameter cylindrical portion 66. The large diameter step portion 67 is formed in an annular plate shape between the lower end portion of the medium diameter cylindrical portion 66 and the upper end portion of the large diameter cylindrical portion 68. The large-diameter cylindrical portion 68 is formed in a right cylindrical shape before the valve plate 55 (described later) is attached.

A procedure for assembling the diaphragm 26, the stopper plate 59, and the holder 57 will be described (see FIGS. 5 to 7).
The mounting hole 27 of the diaphragm 26 is fitted into the small diameter cylindrical portion 64 of the holder 57, and the mounting plate portion 26 a on the inner peripheral side of the diaphragm 26 is disposed on the small diameter step portion 65 of the holder 57 so as to be stacked and concentrically. Is done. Next, the mounting hole 60 of the stopper plate 59 is fitted into the small-diameter cylindrical portion 64 of the holder 57, and the stopper plate 59 is stacked and concentrically arranged on the mounting plate portion 26a on the inner peripheral side of the diaphragm 26. Is done. Next, caulking is performed so that the small-diameter cylindrical portion 64 (mainly the convex portion 64a) of the holder 57 expands radially outward in a petal shape and is stacked on the stopper plate 59 (FIG. 6). And FIG. 7). Thereby, the inner peripheral side mounting plate portion 26a of the diaphragm 26 is sandwiched between the small diameter step portion 65 of the holder 57 and the stopper plate 59 in a sealed state, and the inner peripheral side mounting plate portion. The space between the two 57 and 59 is elastically sealed by 26a. As a result, the inner peripheral part of the diaphragm 26 is attached to the valve member 24 in a sealed state. In this way, the diaphragm subassembly 62 is configured. The holder 57 and the stopper plate 59 correspond to “a pair of shell members” in the present specification.

Prior to the attachment of the valve plate 55 (described later) to the diaphragm subassembly 62 (see FIGS. 6 and 7), the diaphragm subassembly 62 is tiltably connected to the movable core 50, thereby moving the movable body subassembly. 70 (see FIG. 8) is configured. FIG. 8 is a front sectional view showing the movable body subassembly.
As shown in FIG. 8, a hollow portion (denoted by reference numeral 62 a) of the diaphragm subassembly 62 is fitted into the large-diameter cylindrical portion 50 a of the movable core 50. Subsequently, an annular plate-shaped retaining ring 72 is fitted into the small-diameter cylindrical portion 50b of the movable core 50 with almost no gap. The retaining ring 72 is made of, for example, a metal press-formed product. Then, the retaining ring 72 is fixedly attached to the movable core 50 by caulking the lower end portion of the small-diameter cylindrical portion 50b of the movable core 50 over the entire circumference. The retaining ring 72 prevents the diaphragm subassembly 62 from coming off from the movable core 50. The caulking portion of the small diameter cylindrical portion 50b of the movable core 50 is referred to as a caulking portion 50c.

  Further, between the stepped surface on the upper side of the large-diameter cylindrical portion 50 a of the movable core 50 and the retaining ring 72, the peripheral portion of the hollow portion 62 a of the diaphragm subassembly 62 (the mounting plate portion 26 a on the inner peripheral side of the diaphragm 26). (A portion sandwiched between the holder 57 and the stopper plate 59 is equivalent) and a predetermined distance K is set. Further, the hollow portion 62a of the diaphragm subassembly 62 is fitted into the large-diameter cylindrical portion 50a of the movable core 50 with a slight gap in the radial direction. Thereby, the diaphragm subassembly 62 is connected to the movable core 50 so as to be tiltable (see arrow Y in FIG. 8). In this way, the movable body subassembly 70 is configured. The stop ring 72 forms a part of the movable side member 32.

A valve plate 55 is attached to the holder 57 of the movable body subassembly 70 (see FIG. 8) so as to close the lower end opening surface of the internal space (reference numeral 58) of the holder 57 (FIG. 4). reference).
As shown in FIG. 5, the valve plate 55 is made of a resin and has a main plate portion 74 formed in a disc shape, a cylindrical tube portion 75 extending downward from the outer peripheral portion of the main plate portion 74, and the tube portion 75. A flange portion 76 that protrudes radially outward from the lower end portion in a flange shape is concentrically provided. A valve portion 77 made of an annular protrusion is formed concentrically on the lower surface of the flange portion 76. The central portion of the main plate portion 74 is gently recessed downward. Further, an appropriate number of air holes 78 (two are shown in FIG. 3) penetrating in the thickness direction are formed at equal intervals in the circumferential direction on the outer peripheral portion of the main plate portion 74. Further, the outer peripheral surface of the flange portion 76 is formed in a tapered shape that gradually decreases the outer diameter downward. An annular groove 79 is formed on the inner peripheral portion of the upper surface of the flange portion 76.

  As shown in FIG. 5, the valve plate 55 is fitted in the lower end opening of the holder 57. Specifically, the cylinder part 75 of the valve plate 55 is fitted in the medium diameter cylinder part 66 of the holder 57. The flange portion 76 of the valve plate 55 is fitted in the large diameter cylindrical portion 68 of the holder 57. At this time, an annular seal member 80 made of a rubber-like elastic material is fitted into the annular groove 79 of the valve plate 55. The valve plate 55 is fixedly attached to the holder 57 by caulking the large-diameter cylindrical portion 68 of the holder 57 along the outer peripheral surface of the flange portion 76 of the valve plate 55 over the entire circumference. In this way, the movable body 53 is configured. The seal member 80 is sandwiched between the large-diameter step portion 67 of the holder 57 and the flange portion 76 of the valve plate 55, thereby elastically sealing between the both 67 and 76.

  As shown in FIG. 1, when the movable body 53 is assembled to the stationary member 30 of the electromagnetic device 22, the movable core 50 has a coil spring 34 attached to the guide shaft 39 of the stationary member 30 of the electromagnetic device 22. Is fitted through. Further, an outer peripheral mounting plate portion 26b (see FIG. 5) including the bulging portion 26d of the diaphragm 26 is fitted to the inner peripheral portion on the lower surface side of the mounting flange portion 44b of the housing 44, and a diaphragm guide 82 is mounted. (See FIG. 3). The diaphragm guide 82 is made of resin and is formed in an annular shape. The outer peripheral mounting plate portion 26 b including the bulging portion 26 d of the diaphragm 26 is sandwiched between the mounting flange portion 44 b of the housing 44. The space between the two 44 and 82 is elastically sealed by the outer peripheral mounting plate portion 26b including the bulging portion 26d of the diaphragm 26. The diaphragm guide 82 forms a part of the fixed side member.

  Further, the diaphragm 26 is provided between the fixed side member 30 and the valve member 24. The diaphragm 26, the housing 44, and the movable core 50 form an annular pressure equilibrium chamber 84. Further, the pressure introduction passage 28 that connects the outside of the valve member 24 and the pressure equilibrium chamber 84 is formed by the vent hole 78 of the valve plate 55, the internal space 58 of the holder 57, the hollow portion 51 of the movable core 50, and the lateral hole 52. Has been. That is, the pressure introduction passage 28 is formed in the movable side member 32 and the valve member 24 of the electromagnetic device 22.

As shown in FIG. 1, the air bypass valve 20 is installed on the turbocharger casing 10 so as to close the upper end opening surface of the valve chamber 17. The mounting flange portion 44 b of the housing 44 of the air bypass valve 20 is disposed on the opening edge portion of the valve chamber 17 of the casing 10. A mounting flange portion 44b of the housing 44 is fastened to the casing 10 by bolts or the like (not shown).
As shown in FIG. 3, the valve member 24 is disposed in the valve chamber 17 of the casing 10. Further, the valve portion 77 of the valve plate 55 of the valve member 24 corresponds concentrically on the valve seat 15 of the casing 10. Further, an O-ring 86 that elastically seals between the casing 10 and the mounting flange portion 44b of the housing 44 is concentrically interposed.

Next, the operation of the air bypass valve 20 will be described.
When no electromagnetic force is generated in the electromagnetic device 22, that is, when power is not supplied, the movable body 53 is biased in a direction opposite to the suction direction, that is, downward by the biasing force of the coil spring 34. As a result, the valve plate 55 of the valve member 24 is seated on the valve seat 15 of the casing 10, and the valve is closed (see FIGS. 1 and 3).
Further, when an electromagnetic force is generated in the electromagnetic device 22, that is, during energization, the movable body 53 is moved against the biasing force of the coil spring 34 by the electromagnetic force, that is, upward. As a result, the valve plate 55 of the valve member 24 is separated from the valve seat 15 and is opened (see FIG. 2). In addition, when the movable body 53 moves upward, that is, when the valve is opened, the outer peripheral portion of the stopper plate 59 abuts on the holding portion 44a of the housing 44, so that further upward movement of the movable body 53 is restricted.

  By the way, when the valve is closed (see FIG. 3), the diaphragm 26 forms a pressure equilibrium chamber 84 that is partitioned with respect to the outflow passage 14 of the intake bypass passage 12 of the casing 10. The inflow passage 13 of the intake bypass passage 12 and the pressure equilibrium chamber 84 are communicated with each other via the pressure introduction passage 28. Accordingly, the air pressure in the inflow passage 13 of the intake bypass passage 12 acts on the pressure equilibrium chamber 84 via the pressure introduction passage 28. For this reason, the pressure of the air applied to the inflow passage 13 side and the pressure equilibrium chamber 84 side of the intake bypass passage 12 is balanced, that is, the differential pressure between the inflow passage 13 side and the pressure equilibrium chamber 84 side of the intake bypass passage 12. Will be cancelled. Thereby, the urging force of the coil 36 spring 34 and the electromagnetic force of the electromagnetic device 22 can be reduced.

  Further, the valve member 24 is connected to the movable side member 32 of the electromagnetic device 22 so as to be tiltable. Accordingly, even when an axial deviation in the tilt direction occurs between the valve seat 15 and the valve member 24, the valve member 24 tilts with respect to the movable member 32 of the electromagnetic device 22 when the valve is closed. The valve member 24 is aligned with the seat 15. For this reason, the valve member 24 can be properly adhered to the valve seat 15 over the entire circumference.

  According to the air bypass valve 20 described above, the amount of bypass air flowing through the intake bypass passage 12 that bypasses the turbocharger of the internal combustion engine can be controlled.

Further, the valve member 24 to which the diaphragm 26 is attached in a sealed state is connected to the movable side member 32 of the electromagnetic device 22 so as to be tiltable. For this reason, even when an axial deviation in the tilt direction occurs between the valve seat 15 and the valve member 24, the valve member 24 tilts with respect to the movable side member 32 of the electromagnetic device 22 when the valve is closed. A valve member 24 is aligned with the valve seat 15. Thereby, the adhesion (sealability) of the valve member 24 when the valve seat 15 is closed can be improved.
Further, since the diaphragm 26 is attached to the valve member 24 in a sealed state, no air leakage occurs between the diaphragm 26 and the valve member 24. In addition, by connecting the valve member 24 to the movable side member 32 of the electromagnetic device 22 so as to be tiltable, a gap is generated between the movable side member 32 and the valve member 24. The gap is formed between the pressure equilibrium chamber 84 and the intake bypass. There is no problem just by communicating with the inflow path 13 of the passage 12.
Therefore, the occurrence of air leakage at the time of closing of the valve is achieved by cooperation of the improvement in the adhesion (sealability) of the valve member 24 when the valve seat 15 is closed and the attachment of the diaphragm 26 to the valve member 24 in the sealed state. Can be prevented.

  In addition, the valve member 24 includes a holder 57 and a stopper plate 59 that sandwich the diaphragm 26 over the entire circumference and are connected to the movable member 32 of the electromagnetic device 22 so as to be tiltable. Therefore, the diaphragm 26 can be attached to the valve member 24 in a sealed state by sandwiching the diaphragm 26 over the entire circumference by the holder 57 and the stopper plate 59 provided in the valve member 24. The valve member 24 can be tiltably connected to the movable member 32 of the electromagnetic device 22 by the holder 57 and the stopper plate 59.

[Other technical matters]
The present invention is not limited to the embodiment described above, and can be modified without departing from the gist of the present invention. For example, the present invention is not limited to an air bypass valve, and may be applied as a relief valve, a flow control valve, or the like. Further, the fluid is not limited to air (air) but may be a gas other than air, a liquid such as water or fuel, a gas-liquid mixture of gas and liquid, or the like. Further, the structure of the valve member 24 may be changed as appropriate.

10. Casing (fluid passage forming member, intake bypass passage forming member)
12 ... Intake bypass passage (fluid passage)
13 ... Inflow channel (upstream passage)
14 ... Outflow passage (downstream passage part)
15 ... Valve seat 20 ... Air bypass valve (solenoid valve)
22 ... Electromagnetic device 24 ... Valve member 26 ... Diaphragm 28 ... Pressure introduction passage 30 ... Fixed side member 32 ... Movable side member 34 ... Coil spring (elastic member)
57 ... Holder (shell member)
59 ... Stopper plate (shell member)
84 ... Pressure equilibrium chamber

Claims (3)

An electromagnetic device having a fixed side member, a movable side member that is moved in the suction direction by electromagnetic force, and an elastic member that biases the movable side member in a direction opposite to the suction direction;
A valve member connected to the movable side member of the electromagnetic device and opening and closing a valve seat provided in the middle of the fluid passage of the fluid passage forming member;
A diaphragm that is spanned between the stationary member of the electromagnetic device and the valve member, and forms a pressure equilibrium chamber that is partitioned with respect to a passage portion downstream of the valve seat of the fluid passage when the valve is closed;
A solenoid valve comprising: a pressure introduction passage formed on the movable side member and the valve member of the electromagnetic device and communicating with the pressure balance chamber and a passage portion upstream of the valve seat of the fluid passage when the valve is closed. And
An electromagnetic valve, wherein the diaphragm is attached to the valve member in a sealed state, and the valve member is tiltably connected to a movable member of the electromagnetic device. The electromagnetic valve according to claim 1,
The said valve member is equipped with a pair of shell member which clamps the said diaphragm over the perimeter and is connected with respect to the movable side member of the said electromagnetic device so that tilting is possible. The solenoid valve according to claim 1 or 2, wherein the solenoid valve is an air bypass valve that controls an amount of bypass air that flows through an intake bypass passage that bypasses a turbocharger of an internal combustion engine.

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