JP4706781B2 - Solenoid valve - Google Patents

Description

  The present invention relates generally to an electromagnetically driven valve, and more specifically to an electromagnetically driven valve that collectively opens and closes a plurality of valves mounted on an internal combustion engine.

  Regarding a conventional electromagnetically driven valve, for example, US Pat. No. 6,467,441 discloses an electromagnetic actuator in which a valve of an internal combustion engine operates by cooperation of electromagnetic force and elastic force of a spring (Patent Document 1). . The electromagnetic actuator disclosed in Patent Document 1 includes a valve having a stem and a swing arm. The swing arm includes a first end that is swingably supported by the support frame, and a second end that is in contact with the tip of the stem. An electromagnet including a core and a coil wound around the core is disposed above and below the swing arm.

  The electromagnetic actuator is provided at the first end of the swing arm, and a torsion bar that biases the valve toward the open state, and a spiral spring that is disposed on the outer periphery of the stem and biases the valve toward the closed state. Is further provided. The oscillating arm is alternately attracted to the upper and lower electromagnet cores by the electromagnetic force generated by the electromagnet and the elastic force of the torsion bar and the spiral spring.

  Further, an electromagnetically driven valve having the same structure is disclosed in Japanese Patent Application Laid-Open No. 2007-23889 (Patent Document 2), Japanese Patent Application Laid-Open No. 2007-32436 (Patent Document 3), German Patent Application Publication No. 10025491 (Patent Document). Document 4), US Pat. No. 7088209 (Patent Document 5), US Pat. No. 6,571,823 (Patent Document 6), and US Pat. No. 6,481,396 (Patent Document 7).

US Pat. No. 6,467,441 JP 2007-23889 A JP 2007-32436 A German Patent Application Publication No. 10025491 US Patent No. 7088209 US Pat. No. 6,571,823 US Pat. No. 6,481,396

  A structure is conceivable in which two valves of the engine are collectively driven using the electromagnetically driven valves disclosed in the above-mentioned patent documents. However, when the operating state of the engine is in a low rotation region or a low load region, a sufficient intake amount or exhaust amount may be secured only by driving one valve. In such a case, if the two valves are continuously driven, useless power is consumed by the electromagnetically driven valve.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide an electromagnetically driven valve that can reduce power consumption.

  An electromagnetically driven valve according to the present invention is provided in an internal combustion engine, and is connected to a first valve and a second valve, and a first valve and a second valve that are provided in parallel to a common cylinder, and is driven by electromagnetic force. A connecting member to which force is transmitted, and the connecting member and the second valve are provided so that the connection between the connecting member and the second valve can be released. And a switching mechanism for switching from the first state in which the first valve and the second valve are driven to the second state in which the first valve is driven and the second valve is stopped.

  An electromagnetically driven valve according to another aspect of the present invention is provided in an internal combustion engine, and connects a first valve and a second valve, and a first valve and a second valve arranged in parallel, and is driven by electromagnetic force. A connecting member to which force is transmitted and a switching mechanism provided in the connecting member are provided. The switching mechanism switches between a first state in which the first valve and the second valve are driven and a second state in which the first valve is driven and the second valve is stopped.

  According to the electromagnetically driven valve configured as described above, the driving state of the first valve and the second valve is switched between the first state and the second state in accordance with the operating state of the internal combustion engine. As a result, the second valve can be stopped at a timing at which normal operation of the internal combustion engine is ensured only by driving the first valve. Thereby, the power consumption of an electromagnetically driven valve can be reduced.

  Preferably, the connecting member includes a first connecting part connected to the first valve and a second connecting part connected to the second valve. The switching mechanism includes an actuator that operates the connecting member. When switching from the first state to the second state, the actuator rotates the connecting member around the first connecting portion, thereby releasing the connection between the second valve and the second connecting portion. According to the electromagnetically driven valve configured as described above, the driving state of the first valve and the second valve can be switched between the first state and the second state through the operation of the connecting member by the actuator.

  Preferably, the connecting member includes a support portion that supports the second valve in a movable state. The switching mechanism includes a fixing member that fixes the second valve to the support portion, and an actuator that operates the fixing member. When switching from the first state to the second state, the actuator operates the fixing member and releases the fixing of the second valve by the fixing member, thereby moving the support portion relative to the second valve. According to the electromagnetically driven valve thus configured, the driving state of the first valve and the second valve can be switched between the first state and the second state through the operation of the fixing member by the actuator.

  Preferably, the connecting member includes a support portion that supports the second valve in a movable state. The switching mechanism includes a hydraulic mechanism that applies hydraulic pressure to the second valve and fixes the second valve to the support portion. When switching from the first state to the second state, the support portion is moved relative to the second valve by releasing the fixation of the second valve by the hydraulic mechanism. According to the electromagnetically driven valve configured as described above, the operating state of the first valve and the second valve is changed between the first state and the second state through the hydraulic load applied to the second valve by the hydraulic mechanism and the release thereof. Can be switched.

  Preferably, the hydraulic mechanism includes a hydraulic control unit that controls the magnitude of the hydraulic pressure applied to the second valve. According to the electromagnetically driven valve configured as described above, the relative position between the second valve and the connecting member can be adjusted by controlling the hydraulic pressure. Thereby, the drive length of the second valve, that is, the valve lift amount can be adjusted.

  As described above, according to the present invention, an electromagnetically driven valve capable of reducing power consumption can be provided.

It is a top view which shows the gasoline engine carrying the electromagnetically driven valve in Embodiment 1 of this invention. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 1 of this invention. It is sectional drawing of the electromagnetically driven valve along the III-III line in FIG. It is sectional drawing which shows the operating state of the valve plate in FIG. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 2 of this invention. It is sectional drawing which shows the drive state of the electromagnetically driven valve in FIG. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 3 of this invention. It is sectional drawing which shows the drive state of the electromagnetically driven valve in FIG. It is sectional drawing which shows the modification of the electromagnetically driven valve in FIG.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
1 is a plan view showing a gasoline engine equipped with an electromagnetically driven valve according to Embodiment 1 of the present invention. With reference to FIG. 1, the electromagnetically driven valve 10 is mounted on a gasoline engine 60 as an internal combustion engine. The gasoline engine 60 includes a plurality of cylinders 200. The plurality of cylinders 200 are arranged in one direction at intervals. The gasoline engine 60 is an in-line multi-cylinder engine.

  The type of the internal combustion engine on which the electromagnetically driven valve 10 is mounted is not particularly limited, and may be a diesel engine, for example. The internal combustion engine may be a single cylinder engine. The layout in which the plurality of cylinders 200 are arranged is not particularly limited, and the internal combustion engine may be a V-type engine, a horizontally opposed engine, a W-type engine, or the like.

  The gasoline engine 60 includes four valves, that is, intake valves 14p and 14q and exhaust valves 15p and 15q per cylinder. In each cylinder, an intake valve 14p and an intake valve 14q are arranged side by side, and an exhaust valve 15p and an exhaust valve 15q are arranged side by side. The electromagnetically driven valve 10 collectively opens and closes the intake valve 14p and the intake valve 14q of each cylinder of the gasoline engine 60. The electromagnetically driven valve 10 collectively opens and closes the exhaust valve 15p and the exhaust valve 15q of each cylinder of the gasoline engine 60.

  The electromagnetically driven valve 10 may be provided so as to open and close a plurality of three or more intake valves or exhaust valves collectively.

  FIG. 2 is a cross-sectional view showing the electromagnetically driven valve according to Embodiment 1 of the present invention. Hereinafter, the electromagnetically driven valve 10 that collectively opens and closes the intake valve 14p and the intake valve 14q will be described, but the same applies to the electromagnetically driven valve 10 that collectively opens and closes the exhaust valve 15p and the exhaust valve 15q.

  1 and 2, the electromagnetically driven valve 10 is a rotationally driven electromagnetically driven valve that is driven by cooperation of electromagnetic force and elastic force. The electromagnetically driven valve 10 includes intake valves 14p and 14q, a disk 21 that swings around a central axis 25 that is a virtual axis, and electromagnets 51m and 51n that apply an electromagnetic force to the disk 21.

  The intake valve 14p and the intake valve 14q include a stem 11p and a stem 11q, respectively. The stem 11p and the stem 11q extend in parallel to each other. The intake valve 14p and the intake valve 14q reciprocate in the direction in which the stems 11p and 11q extend (the direction indicated by the arrow 101) in response to the swing motion of the disk 21.

  The intake valves 14p and 14q are provided in the cylinder head 18. An intake port 16 is formed in the cylinder head 18. A valve seat 19 is provided at a position where the intake port 16 communicates with the combustion chamber 17. The intake valve 14p and the intake valve 14q include an umbrella portion 12 formed at the tip of the stem 11p and the stem 11q, respectively. As the intake valves 14p and 14q reciprocate, the umbrella portion 12 is brought into close contact with the valve seat 19 or detached from the valve seat 19, whereby the intake port 16 is opened and closed.

  The electromagnetically driven valve 10 includes a valve plate 31 and an intermediate stem 32. The valve plate 31 extends from the intake valve 14p toward the intake valve 14q. The valve plate 31 connects the intake valve 14p and the intake valve 14q. The valve plate 31 transmits the driving force generated by the electromagnetic force to the intake valves 14p and 14q. The intermediate stem 32 connects between the disk 21 and the valve plate 31. The driving force generated by the electromagnetic force is transferred from the disk 21 to the valve plate 31 via the intermediate stem 32.

  The electromagnetically driven valve 10 includes a guide member 41 that guides the stems 11p and 11q so as to be slidable in the axial direction. The electromagnetically driven valve 10 includes a guide member 42 that guides the intermediate stem 32 so as to be slidable in the axial direction. The guide members 41 and 42 are made of metal such as stainless steel, for example, so as to withstand high-speed sliding with each stem.

  On the outer circumferences of the stem 11p and the stem 11q, a lower spring 43 as a first spring member is supported by a bowl-shaped lower retainer 44, respectively. The lower spring 43 is formed of a coil spring. The lower spring 43 applies an elastic force in the direction in which the stems 11p and 11q are raised to the intake valves 14p and 14q.

  A support base 48 is fixed on the top surface of the cylinder head 18. The support base 48 supports electromagnets 51m and 51n. The electromagnet 51m and the electromagnet 51n are arranged above and below the disk 21, respectively.

  The electromagnet 51m and the electromagnet 51n have the same shape. The shape of the electromagnet 51n will be described typically. The electromagnet 51n includes a coil 53 and a core 52. The coil 53 is wound around the core 52.

  The core 52 is made of a magnetic material, and in this embodiment, the core 52 is made of a plurality of laminated electromagnetic steel plates. The core 52 may be formed of a magnetic material other than the electromagnetic steel plate, for example, a green compact of magnetic powder. The coil 53 of the electromagnet 51m and the coil 53 of the electromagnet 51n may be formed from a single continuous coil wire or may be formed from separate coil wires.

  The disk 21 is supported on the support base 48. The disk 21 is made of a magnetic material. The disk 21 is formed from a bulk material to ensure strength. The disk 21 includes a support portion 23 and a connecting portion 22. A central axis 25 is defined in the support portion 23. The disk 21 extends from the support portion 23 toward the connecting portion 22 in a direction intersecting the stems 11p and 11q.

  A through hole 24 is formed in the support portion 23. A torsion bar 30 as a second spring member is press-fitted into the through hole 24. The torsion bar 30 extends in the axial direction of the central shaft 25. The support portion 23 is rotatably supported by the support base 48 via the torsion bar 30. The intermediate stem 32 and the disk 21 are connected by the tip 32c of the intermediate stem 32 coming into contact with the connecting portion 22.

  The torsion bar 30 applies an elastic force to the disk 21 in a direction to rotate counterclockwise about the central axis 25. In other words, the torsion bar 30 applies the elastic force in the direction in which the stems 11p and 11q are lowered via the valve plate 31 to the intake valves 14p and 14q. In a state where the electromagnetic force is not acting on the disc 21, the disc 21 is positioned at an intermediate position between the valve opening position and the valve closing position by the elastic force of the lower spring 43 and the torsion bar 30.

  When a current is supplied to the coil 53 of the electromagnet 51m, a magnetic flux flow passing through the core 52 and the disk 21 of the electromagnet 51m is formed. Accordingly, the electromagnet 51m generates an electromagnetic force that attracts the disk 21. When a current is supplied to the coil 53 of the electromagnet 51n, a magnetic flux flow is formed through the core 52 and the disk 21 of the electromagnet 51n. As a result, the electromagnet 51n generates an electromagnetic force that attracts the disk 21.

  The disk 21 is alternately attracted to the electromagnet 51m and the electromagnet 51n by the electromagnetic force generated by the electromagnet 51m and the electromagnet 51n and the elastic force of the lower spring 43 and the torsion bar 30, and swings about the central shaft 25. When the disk 21 is attracted to the electromagnet 51m, the stems 11p and 11q are raised, and the intake valves 14p and 14q are positioned to the closed position. When the disk 21 is attracted to the electromagnet 51n, the stems 11p and 11q are lowered, and the intake valves 14p and 14q are positioned to the valve opening position.

  FIG. 3 is a cross-sectional view of the electromagnetically driven valve taken along line III-III in FIG. FIG. 4 is a cross-sectional view showing the operating state of the valve plate in FIG.

  2 to 4, the valve plate 31 includes a connecting portion 34 as a first connecting portion and a connecting portion 35 as a second connecting portion. The intake valve 14p and the intake valve 14q are connected to a connecting portion 34 and a connecting portion 35, respectively. A hole 36 and a hole 37 are formed in the connecting part 34 and the connecting part 35, respectively. The stem 11p of the intake valve 14p and the stem 11q of the intake valve 14q are inserted into the hole 36 and the hole 37, respectively.

  The connection part 35 is formed with a notch part 37g. The notch 37g is formed so as to open a part of the periphery of the hole 37. The notch width of the notch 37g is larger than the diameter of the stem 11q. The hole 36 is formed in a shape whose peripheral edge is closed over the entire circumference.

  The electromagnetically driven valve 10 includes hydraulic cylinders 61 and 62 as actuators. The hydraulic cylinder 61 and the hydraulic cylinder 62 include an arm 61g and an arm 62g, respectively. The hydraulic cylinder 61 and the hydraulic cylinder 62 are arranged on both sides of the valve plate 31. The arm 61g and the arm 62g are in contact with the valve plate 31 between the connecting portion 34 and the connecting portion 35.

  The hydraulic cylinders 61 and 62 switch between a two-valve drive state in which the intake valve 14p and the intake valve 14q are driven and a one-valve drive state in which the intake valve 14p is driven and the intake valve 14q is stopped.

  More specifically, the arm 61 g pushes the valve plate 31 by supplying hydraulic pressure to the hydraulic cylinder 61. At this time, the valve plate 31 rotates with the connecting portion 34 as a fulcrum, and the stem 11q comes out of the hole 37 through the notch 37g. As a result, the connection between the connecting portion 35 and the intake valve 14q is released. The intake valve 14q separated from the swinging motion of the disk 21 receives the elastic force of the coil spring 43 and stops at the valve closing position. As a result, the electromagnetically driven valve 10 is in a one-valve drive state in which only the intake valve 14p is driven.

  By supplying hydraulic pressure to the hydraulic cylinder 62, the arm 62g pushes the valve plate 31. At this time, the valve plate 31 rotates in the direction opposite to the previous rotation direction, and the stem 11q fits into the hole 37 through the notch 37g. Thereby, the connection part 35 and the intake valve 14q are connected. As a result, the electromagnetically driven valve 10 enters a two-valve drive state in which the intake valve 14p and the intake valve 14q are driven.

  An actuator other than the hydraulic cylinder may be used as the actuator that operates the valve plate 31. For example, an air cylinder or an electric motor may be used as the actuator.

  An electromagnetically driven valve 10 according to Embodiment 1 of the present invention is provided in a gasoline engine 60 as an internal combustion engine, and an intake valve 14p as a first valve and an intake valve 14q as a second valve that are provided side by side, and an intake valve 14p and intake valve 14q are connected to each other, and a valve plate 31 as a connecting member to which a driving force generated by electromagnetic force is transmitted, and hydraulic cylinders 61 and 62 as a switching mechanism provided in the valve plate 31 are provided. The hydraulic cylinders 61 and 62 have a two-valve drive state as a first state in which the intake valve 14p and the intake valve 14q are driven, and a one-valve drive state as a second state in which the intake valve 14p is driven and the intake valve 14q is stopped. And switch.

  According to the electromagnetically driven valve 10 according to Embodiment 1 of the present invention configured as described above, when the operation of the gasoline engine 60 is in a low rotation region or a low load region, the intake valve 14p and the intake valve 14q There may be a case where a sufficient intake amount is secured only by opening one of the valves. In the present embodiment, only the intake valve 14p is driven by switching from the two-valve driving state to the one-valve driving state at such timing. Thereby, the electromagnetic force required for driving the valve can be kept small, and the power consumption of the electromagnetically driven valve 10 can be reduced.

(Embodiment 2)
FIG. 5 is a sectional view showing an electromagnetically driven valve according to Embodiment 2 of the present invention. 6 is a cross-sectional view showing a driving state of the electromagnetically driven valve in FIG. The electromagnetically driven valve in the present embodiment basically has the same structure as that of the electromagnetically driven valve 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  With reference to FIGS. 5 and 6, in the present embodiment, valve plate 31 includes a support portion 65. The support part 65 supports the intake valve 14q in a movable state. The support part 65 supports the intake valve 14q in a movable state in the reciprocating direction. A hole 66 is formed in the support portion 65. The hole 66 is a through hole. A stem 11q of the intake valve 14q is inserted into the hole 66. The stem 11q is inserted so as to be slidable in the axial direction.

  The electromagnetically driven valve in the present embodiment includes a pin 68 as a fixed member and a hydraulic cylinder 69 as an actuator that operates the pin 68. For example, engine oil in the cylinder head 18 is supplied to the hydraulic cylinder 69.

  FIG. 6 (A) shows the state when the valve plate 31 is positioned at the valve opening position in the two-valve driving state. As shown in FIG. 6A, by supplying hydraulic pressure to the hydraulic cylinder 69, the pin 68 is inserted into the valve plate 31 and the intake valve 14q. Thereby, the intake valve 14q is fixed to the support portion 65. At this time, the electromagnetically driven valve is in a two-valve drive state in which the intake valve 14p and the intake valve 14q are driven.

  FIG. 6B shows a state where the valve plate 31 is positioned at the valve opening position in the one-valve driving state. As shown in FIG. 6B, by stopping the supply of hydraulic pressure to the hydraulic cylinder 69, the pin 68 moves to a position where it is retracted from the valve plate 31 and the intake valve 14q. As a result, the fixing of the intake valve 14q by the pin 68 is released. The intake valve 14q separated from the swinging motion of the disk 21 receives the elastic force of the lower spring 43 and stops at the valve closing position. The valve plate 31 reciprocates while sliding the support portion 65 with the stem 11q. As a result, the electromagnetically driven valve is in a one-valve drive state in which only the intake valve 14p is driven.

  An actuator other than the hydraulic cylinder may be used as the actuator that operates the pin 68. For example, an air cylinder or an electric motor may be used as the actuator. The fixing member that fixes the intake valve 14q to the support portion 65 is not limited to a pin shape, and may be, for example, a friction plate that uses frictional engagement to fix the intake valve 14q to the support portion 65. .

  According to the electromagnetically driven valve according to the second embodiment of the present invention configured as described above, the same effects as those described in the first embodiment can be obtained.

(Embodiment 3)
FIG. 7 is a sectional view showing an electromagnetically driven valve according to Embodiment 3 of the present invention. FIG. 8 is a cross-sectional view showing a driving state of the electromagnetically driven valve in FIG. The electromagnetically driven valve in the present embodiment basically has the same structure as that of the electromagnetically driven valve 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIG. 7, in the present embodiment, valve plate 31 includes a support portion 65. Support portion 65 has the same structure as support portion 65 in the second embodiment. The electromagnetically driven valve in the present embodiment includes a hydraulic mechanism 70. The hydraulic mechanism 70 applies hydraulic pressure to the intake valve 14q, and fixes the intake valve 14q to the support portion 65. That is, the hydraulic pressure loaded on the intake valve 14q by the hydraulic mechanism 70 plays the same role as the pin 68 in the second embodiment.

  The hydraulic mechanism 70 includes a hydraulic chamber 71. Oil for applying a hydraulic pressure to the intake valve 14q is supplied to the hydraulic chamber 71. A support portion 65 is inserted into the hydraulic chamber 71. The support portion 65 is inserted so as to be slidable in the reciprocating direction of the valve plate 31. An O-ring 72 and an O-ring 73 as seal members are disposed between the stem 11q and the support portion 65 and between the support portion 65 and the inner wall of the hydraulic chamber 71, respectively. With such a configuration, oil leakage from the hydraulic chamber 71 is prevented.

  FIG. 8A shows a state where the valve plate 31 is positioned at the valve opening position in the two-valve driving state. As shown in FIG. 8 (A), the hydraulic mechanism 70 applies a hydraulic pressure to the intake valve 14q, so that the position of the intake valve 14q with respect to the support portion 65 is fixed. The valve plate 31 reciprocates the intake valves 14p and 14q while sliding with the inner wall of the hydraulic chamber 71. At this time, the electromagnetically driven valve is in a two-valve drive state in which the intake valve 14p and the intake valve 14q are driven.

  FIG. 8B shows a state when the valve plate 31 is positioned at the valve opening position in the one-valve driving state. As shown in FIG. 8B, when the hydraulic pressure supply by the hydraulic mechanism 70 is stopped, the intake valve 14q receives the elastic force of the coil spring 43 and stops at the valve closing position. The valve plate 31 reciprocates the intake valve 14p while sliding with the inner wall of the hydraulic chamber 71 and the stem 11q of the intake valve 14q. At this time, the electromagnetically driven valve is in a one-valve drive state in which only the intake valve 14p is driven.

  According to the electromagnetically driven valve according to the third embodiment of the present invention configured as described above, the same effects as those described in the first embodiment can be obtained.

  FIG. 9 is a cross-sectional view showing a modification of the electromagnetically driven valve in FIG. In the drawing, the state when the valve plate 31 is positioned at the valve opening position in the two-valve driving state is shown.

  Referring to FIG. 9, in this modification, the hydraulic mechanism 70 includes a hydraulic control unit 76. The hydraulic control unit 76 controls the magnitude of the hydraulic pressure applied to the intake valve 14q by the hydraulic mechanism 70. With such a configuration, the position at which the intake valve 14q is fixed with respect to the support portion 65 can be adjusted, and the lift amount of the intake valve 14q can be made variable. For example, as shown in the figure, the lift amount of the intake valve 14q can be reduced by setting the hydraulic pressure applied to the intake valve 14q to be small.

  It is possible to provide the hydraulic mechanism 70 including the hydraulic control unit 76 in both the intake valves 14p and 14q. In this case, the valve lift amounts of the intake valve 14p and the intake valve 14q can be made variable, and the degree of freedom can be improved.

  The structure of the electromagnetically driven valve to which the present invention is applied is not limited to the structure described above, and can be changed as appropriate. For example, an upper disk and a lower disk may be arranged above and below the electromagnet, and an intermediate stem may be connected to these disks. The electromagnetically driven valve is not limited to a rotary drive type, and may be a translational drive type that drives the valve by a linear motion obtained by an electromagnetic force.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 Electromagnetically driven valve, 14p, 14q Intake valve, 31 Valve plate, 34, 35
Connecting part, 60 gasoline engine, 61, 62, 69 hydraulic cylinder, 65 support part, 70 hydraulic mechanism, 76 hydraulic control part.

Claims (1)

A first valve and a second valve provided in the internal combustion engine and arranged in parallel with a common cylinder;
A connecting member connected to the first valve and the second valve, to which a driving force generated by electromagnetic force is transmitted;
Provided so that the connection between the connection member and the second valve can be released, and the connection between the connection member and the second valve is released when the operating state of the internal combustion engine is in a low rotation region or a low load region. By doing this, the first valve is driven and the second valve is switched from the first state in which the first valve and the second valve are driven to stop at the position where the cylinder is closed. An electromagnetically driven valve comprising a switching mechanism.

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