JP2007332880A - Solenoid-driven valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid-driven valve capable of improving a degree of freedom of mounting an electromagnetic actuator for driving an engine valve. <P>SOLUTION: The electromagnetic actuator 30 transmits its driving force to an arm member 50, by rocking a disc 33, by attracting the disc 33 arranged between mutually oppositely arranged electromagnets 31 and 32 to the respective electromagnets 31 and 32. The arm member 50 is rotatably supported around a fulcrum 51, and transmits the driving force of the electromagnetic actuator 30 inputted to a cam-follower 53 to an intake valve 29 by its rotational movement. Thus, the intake valve 20 is driven for opening and closing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetically driven valve that opens and closes an engine valve such as an intake valve or an exhaust valve of an internal combustion engine with electromagnetic force.

  2. Description of the Related Art Conventionally, an electromagnetically driven valve is known in which an engine valve such as an intake valve or an exhaust valve of an internal combustion engine is driven to open and close with an electromagnetic force. In such an electromagnetically driven valve, the engine valve is driven to open and close by an electromagnetic actuator including an electromagnet and an output member that is operated by the electromagnetic force of the electromagnet. As an electromagnetic actuator of such an electromagnetically driven valve, as shown in Patent Document 1, a disk as an output member is supported so as to be swingable between a pair of electromagnets provided to face each other. As disclosed in Patent Document 2, an armature as an output member is supported so as to be movable in parallel between a pair of electromagnets provided to face each other.

In the electromagnetic actuator configured as described above, when an electromagnet is energized, an electromagnetic force directed to the electromagnet acts on an output member such as a disk or an armature. Then, the output member is attracted and moved by the electromagnetic force, thereby driving the engine valve. For example, in the electromagnetically driven valve shown in Patent Document 1, due to the movement of the disk, the contact portion provided at the working end of the disk presses the tip of the valve stem of the engine valve, and the engine valve is driven in the axial direction. . Further, in the electromagnetically driven valve shown in Patent Document 2, the movement of the armature moves the valve stem of the engine valve connected to the armature, and the engine valve is driven in the axial direction. Then, by alternately energizing the pair of electromagnets, the engine valve is reciprocated in the axial direction to open and close the engine valve.
US Pat. No. 6,467,441 JP 2000-303809 A

  By the way, in the electromagnetically driven valve shown in Patent Document 1, since the disk of the electromagnetic actuator is configured to press the tip of the valve stem, the electromagnetic actuator is disposed on the operating shaft of the engine valve. Also in the electromagnetically driven valve disclosed in Patent Document 2, the armature of the electromagnetic actuator is connected to the valve stem, so that the electromagnetic actuator is also disposed on the operating shaft of the engine valve. For this reason, the overall height of the internal combustion engine becomes high, and restrictions are imposed on the layout of the internal combustion engine. In addition, when an electromagnetically driven valve is configured as in Patent Document 1 and Patent Document 2, one electromagnetic actuator is required for each engine valve, and thus there is a problem in that restrictions on the layout are further added.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electromagnetically driven valve that can improve the degree of freedom of mounting an electromagnetic actuator that drives an engine valve.

  In order to achieve the above object, an invention according to claim 1 includes a pair of electromagnets provided to face each other, and an output member that is disposed between the electromagnets and that is actuated by the electromagnetic force of the electromagnet. An electromagnetic actuator having an internal combustion engine supported so as to be capable of reciprocating movement, and an arm member rotatably supported around a predetermined fulcrum. The driving force of the output member of the electromagnetic actuator is controlled by the arm. The gist thereof is an electromagnetically driven valve that is transmitted to the engine valve through rotation of a member and drives the engine valve to open and close.

  According to the configuration, the electromagnetically driven valve opens and closes the engine valve by transmitting the driving force of the output member of the electromagnetic actuator to the engine valve through the rotation of the arm member. As described above, when the electromagnetic actuator and the engine valve are interlocked via the arm member, it is not necessary to arrange the electromagnetic actuator on the operating shaft of the engine valve, and the degree of freedom of arrangement of the electromagnetic actuator can be improved. For this reason, restrictions on the layout of the internal combustion engine can be relaxed, for example, by reducing the overall height of the internal combustion engine. Further, by using the arm member, it is possible to set an electromagnetic actuator arrangement that is optimal for various types of internal combustion engines.

The gist of the invention according to claim 2 is that, in the electromagnetically driven valve according to claim 1, the arm member is supported by a lash adjuster at the fulcrum.
According to this configuration, since the fulcrum of the arm member is supported by the lash adjuster, when the engine valve is closed, it is possible to absorb the influence of thermal expansion and the like so that the engine valve is reliably closed. it can.

  According to a third aspect of the present invention, in the electromagnetically driven valve according to the first or second aspect, energization is performed to an electromagnet provided on a cylinder head side that supports the engine valve, of the pair of electromagnets. Sometimes, the gist is that the engine valve is driven in the valve closing direction.

  In the stroke of the internal combustion engine, the valve closing time of the engine valve is longer than the valve opening time, so the amount of heat generated by the electromagnet on the side that drives the engine valve in the valve closing direction is larger than the amount of heat generated by the other electromagnet. . In addition, when control is performed to reduce the lift amount of the intake valve when the intake air amount of the internal combustion engine is small, current control is performed to maintain the intake valve on the valve closing side. The amount of heat generated by the electromagnet on the side that drives the intake valve in the valve closing direction is increased by a large current required for current control.

  In this regard, according to the same configuration, the engine valve is driven in the valve closing direction when energization is performed with respect to the electromagnet provided on the cylinder head side that supports the engine valve among the pair of electromagnets. An electromagnet on the side that drives the valve in the valve closing direction can be provided on the cylinder head side. For this reason, when the electromagnet on the side that drives the engine valve in the valve closing direction has a large heat generation amount as described above, the heat generation is configured to be easily radiated or transferred to the cylinder head cooled by cooling water or the like. be able to. Thereby, it can suppress that the temperature of the electromagnetic coil of an electromagnet rises exceeding the heat-resistant temperature of a coil, and electromagnetic force falls by the temperature rise of an electromagnet.

  According to a fourth aspect of the present invention, in the electromagnetically driven valve according to any one of the first to third aspects, the arm member has a distance between a power point at which the driving force of the output member acts and the fulcrum, The gist is that it is longer than the distance between the operating point for driving the engine valve and the fulcrum.

  According to this configuration, the arm member is longer than the driving force of the output member because the distance between the power point at which the driving force of the output member acts and the fulcrum is longer than the distance between the operating point to drive the engine valve and the fulcrum. The engine valve can be driven with a large driving force. For this reason, the amount of current supplied to the electromagnet can be reduced, and the power consumption can be reduced. Such a configuration requires a relatively large operating load and a large driving force for the electromagnetic actuator, such as when driving an exhaust valve that opens with a high cylinder pressure, such as before the end of the expansion stroke of the internal combustion engine. It can utilize suitably in such a case.

  According to a fifth aspect of the present invention, in the electromagnetically driven valve according to any one of the first to third aspects, the arm member has a distance between a power point at which the driving force of the output member acts and the fulcrum, The gist is that it is shorter than the distance between the operating point for driving the engine valve and the fulcrum.

  According to this configuration, the arm member has a shorter distance between the fulcrum and the force point at which the driving force of the output member acts than the distance between the fulcrum and the action point that drives the engine valve. The amount of movement of the engine valve can be increased. For this reason, the valve lift amount of the engine valve can be increased. Such a configuration can be suitably used when the operation load is relatively small but a large valve lift amount is desired, such as when the intake valve is driven.

  According to a sixth aspect of the present invention, in the electromagnetically driven valve according to any one of the first to fifth aspects, the output member directly contacts the arm member to rotate the arm member, and the engine The gist is to drive the valve to open and close.

  According to this configuration, the output member of the electromagnetic actuator directly contacts the arm member and rotates the arm member to drive the opening and closing of the engine valve. The power consumption of the electromagnet can be reduced by increasing the transmission efficiency of the movable member and reducing the weight of the movable part.

A seventh aspect of the invention is the electromagnetically driven valve according to the sixth aspect, wherein the arm member is made of a magnetic material.
According to this configuration, since the arm member is made of a magnetic material, the arm member that is in direct contact with the output member is also connected to the magnetic circuit made up of the electromagnetic core of the electromagnet and the output member. Can be used as part. For example, when the contact portion of the output member with respect to the arm member is formed in the suction surface that is attracted by the electromagnet, a notch portion is provided in the electromagnetic core to avoid interference between the electromagnetic core and the arm member. It is done. Thus, when a notch part exists in an electromagnetic core, since a magnetic circuit will be partly cut | disconnected, an electromagnetic force will fall. In this regard, when the arm member is made of a magnetic material as in the same configuration, a magnetic circuit can be formed via the arm member arranged in the notch, so that the electromagnetic force can be increased. As a result, power consumption in the electromagnet can be reduced.

The gist of an eighth aspect of the present invention is the electromagnetically driven valve according to any one of the first to seventh aspects, wherein the arm member is configured such that the position of the fulcrum is adjustable.
According to this configuration, since the arm member is configured so that the position of the fulcrum can be adjusted, by adjusting the position of the fulcrum, the positional relationship and operation of the power point where the driving force of the output member acts and the point of action which drives the engine valve The stroke relationship can be corrected. For this reason, it is possible to adjust the engine valve so as to have a desired opening / closing characteristic by absorbing the variation in the shape of the operating member of the electromagnetically driven valve.

  A ninth aspect of the invention is the electromagnetically driven valve according to the eighth aspect, wherein the arm member is configured such that the position of the fulcrum is movable in the operating direction of the output member. Yes.

  According to this configuration, since the arm member is configured so that the position of the fulcrum can move in the operation direction of the output member, the operation timing of the output member and the operation timing of the engine valve are accurately adjusted by adjusting the position of the fulcrum. Can be matched. In addition, when each electromagnet is configured to attract the output member from an intermediate position between the electromagnets, the electromagnetic force of each electromagnet acting on the output member is not biased by adjusting the intermediate position of the output member. Therefore, the engine valve can be reliably opened and closed.

  A tenth aspect of the present invention is the electromagnetically driven valve according to the eighth aspect, wherein the arm member drives the engine valve with respect to a distance between a power point at which the driving force of the output member acts and the fulcrum. The gist is that the ratio of the distance between the fulcrum and the fulcrum can be changed.

  According to this configuration, the arm member is configured to be able to change the ratio of the distance between the fulcrum and the operating point that drives the engine valve to the distance between the fulcrum and the force point at which the driving force of the output member acts. By adjusting the position, the operating stroke of the output member and the operating stroke of the engine valve can be accurately aligned. For this reason, the operating stroke of the engine valve can be adjusted to a desired valve lift amount, and the intended performance of the internal combustion engine can be brought out.

  According to an eleventh aspect of the present invention, in the electromagnetically driven valve according to any one of the first to tenth aspects, the fulcrum position variable that makes the position of the fulcrum of the arm member variable according to the engine operating state of the internal combustion engine. The gist is to further include means.

  According to this configuration, the electromagnetically driven valve includes the fulcrum position changing means for changing the position of the fulcrum of the arm member according to the engine operating state of the internal combustion engine. The valve lift can be made variable, and the engine characteristics of the internal combustion engine can be improved. As a method of making the fulcrum position variable, a method of driving and controlling the supporting member of the fulcrum of the arm member by an electric actuator or a method of driving and controlling the supporting member by hydraulic pressure can be employed. Further, even when the valve lift amount etc. changes over time due to the operation of the internal combustion engine, the valve lift amount etc. can be finely adjusted by such fulcrum position varying means, so that the durability reliability of the internal combustion engine is improved. Can do.

  According to a twelfth aspect of the present invention, in the electromagnetically driven valve according to any one of the first to eleventh aspects, the electromagnetic actuator opens and closes a plurality of engine valves provided in the same cylinder via the arm member. The gist is to drive.

  According to this configuration, since the electromagnetic actuator drives the plurality of engine valves provided in the same cylinder via the arm member to open and close, the plurality of intake valves or exhaust valves that operate in synchronism with one electromagnetic actuator. Can be driven. For this reason, the number of electromagnetic actuators can be reduced, and the mounting space can be reduced and the cost can be reduced. In addition, by reducing the number of electromagnetic actuators, it is possible to reduce the number of movable members that operate when the engine valve is driven to open and close. By increasing the transmission efficiency of the movable members and reducing the weight of the movable parts, Power consumption can be reduced. Further, when the number of electromagnetic actuators is reduced, the number of drive circuits provided for each electromagnetic actuator can be reduced, so that further cost reduction can be achieved.

  A thirteenth aspect of the present invention is the electromagnetically driven valve according to any one of the first to eleventh aspects, wherein the electromagnetic actuator opens and closes a plurality of engine valves provided between other cylinders via the arm member. The gist is to drive.

  According to this configuration, the electromagnetic actuator opens and closes the plurality of engine valves provided between the other cylinders via the arm member. Can be driven by. For this reason, the number of electromagnetic actuators can be further reduced, and the mounting space can be reduced, the cost can be reduced, and the power consumption can be further reduced.

  According to a fourteenth aspect of the present invention, in the electromagnetically driven valve according to the twelfth or thirteenth aspect, the electromagnetic actuator rotates a plurality of arm members provided corresponding to the plurality of engine valves. The gist of the invention is to open and close a plurality of engine valves.

  According to this configuration, the electromagnetic actuator rotates the plurality of arm members provided corresponding to the plurality of engine valves to open and close the plurality of engine valves. By adjustment, the valve lift amount and the like of the corresponding engine valve can be adjusted. For this reason, adjustment of the operation characteristic for every engine valve becomes easy.

  According to a fifteenth aspect of the present invention, in the electromagnetically driven valve according to the twelfth or thirteenth aspect, the plurality of engine valves are connected by a retainer, and the arm member presses the retainer, thereby The gist is to drive a plurality of engine valves in synchronization.

  According to this configuration, the arm member presses a retainer that connects a plurality of engine valves to drive the plurality of engine valves to open and close synchronously, so that the plurality of engine valves are regarded as one engine valve and are opened and closed. It can be driven. For this reason, it is possible to reduce the number of components such as valve springs and cam followers of the engine valve, simplifying the configuration, reducing the weight of the movable portion, and reducing the cost.

  According to a sixteenth aspect of the present invention, in the electromagnetically driven valve according to any one of the first to fifteenth aspects, the engine valve is configured such that a planar shape of the umbrella portion is formed in a shape other than a circle. It is a summary.

  According to this configuration, since the planar shape of the umbrella portion of the engine valve is formed in a shape other than a circle, a plurality of intake valves or exhaust valves in the cylinder are connected to, for example, one intake air having an equivalent opening area. It can be formed as a valve or an exhaust valve. That is, by making the plane shape of the umbrella portion of the intake valve or exhaust valve elliptical or different, a large opening area can be secured, so the number of intake valves or exhaust valves provided in the cylinder is reduced. Can do. For this reason, the number of electromagnetic actuators that open and close the engine valve can be reduced while securing the intake and exhaust performance of the internal combustion engine, and the mounting space can be reduced and the cost can be reduced.

  According to a seventeenth aspect of the present invention, in the electromagnetically driven valve according to the sixteenth aspect, the engine valve includes an anti-rotation mechanism that prevents the engine valve from rotating about a valve stem supported so as to be reciprocally movable. This is the gist.

  According to this configuration, the engine valve includes an anti-rotation mechanism that prevents the engine valve from rotating about a valve stem that is supported so as to be capable of reciprocating, so that the umbrella portion of the engine valve is formed in a shape other than a circle. In this case, the engine valve can be reliably closed.

  According to an eighteenth aspect of the present invention, in the electromagnetically driven valve according to any one of the first to seventeenth aspects, an electromagnetic actuator that is used to open and close the intake valve, and an electromagnetic actuator that is used to open and close the exhaust valve; It is the gist of the common use.

  According to this configuration, the electromagnetic actuator used for opening / closing drive of the intake valve and the electromagnetic actuator used for opening / closing drive of the exhaust valve are commonly used, and therefore, parts management and the like in the manufacturing process can be facilitated.

  According to a nineteenth aspect of the present invention, in the electromagnetically driven valve according to the eighteenth aspect, the number of intake valves that are opened and closed by one electromagnetic actuator is greater than the number of exhaust valves that are opened and closed by one electromagnetic actuator. Its gist is to be configured to increase.

  Since the exhaust valve is driven to open while the cylinder pressure is high, such as before the end of the expansion stroke of the internal combustion engine, the operation load becomes relatively large. On the other hand, the intake valve is driven to open and close while the pressure in the cylinder is lower than that of the exhaust valve, so that the operation load is relatively small. For this reason, when the intake valve and the exhaust valve are driven to open and close by the same electromagnetic actuator that is commonly used, the drive force is sufficient for the open / close drive of the intake valve, while the drive force is sufficient for the open / close drive of the exhaust valve. There may be situations where no.

  In this regard, according to this configuration, the number of intake valves that are opened and closed by one electromagnetic actuator is configured to be greater than the number of exhaust valves that are opened and closed by one electromagnetic actuator. It is possible to equalize the operation load borne by the electromagnetic actuator and the operation load borne by the electromagnetic actuator of the exhaust valve. For this reason, the engine valve can be efficiently opened and closed while the electromagnetic actuator is shared, and the power consumption of the electromagnetically driven valve in the entire internal combustion engine can be suitably reduced.

  The invention according to claim 20 is the electromagnetically driven valve according to any one of claims 1 to 19, wherein the output member is supported so as to be swingable about a predetermined rotation axis. It is said.

  According to this configuration, since the output member of the electromagnetic actuator is supported so as to be swingable about a predetermined rotation axis, the operation stroke of the output member is larger than that of the electromagnetic actuator configured to translate the output member. While securing the output member, the distance between the output member and the electromagnet can be shortened when the output member is attracted. For this reason, since a big electromagnetic force can be made to act on an output member, the electric current amount supplied to an electromagnet can be reduced and power consumption can be reduced.

  Hereinafter, embodiments embodying an electromagnetically driven valve according to the present invention will be described. In each of the following embodiments, a configuration in which the electromagnetically driven valve drives the intake valve of the engine valve will be described, but the same configuration is applied to the electromagnetically driven valve even when the exhaust valve is driven. be able to.

(First embodiment)
A first embodiment that embodies an electromagnetically driven valve according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a cross-sectional view showing the configuration of the electromagnetically driven valve 1 according to the first embodiment. The cylinder head 11 of the internal combustion engine 10 on which the electromagnetically driven valve 1 is mounted is formed with an intake port 14 that forms part of the intake passage and communicates with the combustion chamber 13 in the cylinder 12. The cylinder head 11 is provided with an intake valve 20, and when the intake valve 20 is driven to open and close, the combustion chamber 13 and the intake port 14 are communicated and disconnected.

  The electromagnetically driven valve 1 includes an intake valve 20, an electromagnetic actuator 30 that serves as a power source for opening and closing the intake valve 20, and an arm member 50 that is interposed between the intake valve 20 and the electromagnetic actuator 30.

  Two intake valves 20 are provided in the cylinder 12 and are driven to open and close in synchronization. Each intake valve 20 includes an umbrella portion 20 a provided at the lower end and a valve stem 20 b supported by the cylinder head 11. The valve stem 20 b is supported by a valve guide 21 provided in the cylinder head 11 so as to be capable of reciprocating in the axial direction. When the intake valve 20 moves upward, the umbrella portion 20a is seated on the valve seat 22 provided in the cylinder head 11, and the closed state is established in which the combustion chamber 13 and the intake port 14 are blocked. Further, when the intake valve 20 moves downward, the umbrella portion 20a is separated from the valve seat 22, and the combustion chamber 13 and the intake port 14 are communicated with each other.

  A retainer 23 is provided at the upper end of the valve stem 20 b of the intake valve 20. The retainer 23 is configured to connect the two intake valves 20, whereby the two intake valves 20 move in synchronization with the axial direction. A valve spring 24 is disposed in a compressed state between the cylinder head 11 and the retainer 23, and the intake valve 20 is urged in the valve closing direction by the valve spring 24. A cam follower 25 that abuts on the arm member 50 is provided at the center of the retainer 23.

  The electromagnetic actuator 30 includes a pair of electromagnets including an electromagnet 31 disposed above and an electromagnet 32 disposed below, and a disk 33 serving as an output member that operates when the electromagnetic force of the electromagnets 31 and 32 acts. . The electromagnets 31 and 32 are provided opposite to each other, and the disk 33 is disposed in a space 34 provided between the electromagnet 31 and the electromagnet 32.

  The electromagnets 31 and 32 have electromagnetic coils 35 and 36 and electromagnetic cores 37 and 38. The disk 33 is supported so as to be able to swing with respect to the case 39 of the electromagnetic actuator 30 and is made of a magnetic material. The disk 33 has a plate portion 40 on which the electromagnetic force of the electromagnets 31 and 32 acts, and a shaft portion 41 that serves as a swinging rotation shaft. A torsion bar spring 42 is disposed in the center hole of the shaft portion 41. The plate portion 40 of the disk 33 is elastically supported at a predetermined position in the space 34 by the torsion bar spring 42.

  When electric current is supplied to the electromagnetic coil 35 of the electromagnet 31 and the electromagnetic coil 36 of the electromagnet 32, electromagnetic force is generated in the electromagnetic cores 37 and 38, and the plate portion 40 is attracted to the electromagnetic cores 37 and 38, so that the disk 33 swings in the space 34. When the disk 33 swings, the restoring force of the torsion bar spring 42 acts on the disk 33.

  The arm member 50 is supported so as to be rotatable around a fulcrum 51 formed in the middle in the longitudinal direction. A fulcrum 51 of the arm member 50 is supported by a lash adjuster 52. A cam follower 53 is provided at one end of the arm member 50 on the electromagnetic actuator 30 side so as to come into contact with an output surface 33 a provided at the tip of the disk 33. The cam follower 53 is directly transmitted with the driving force generated by the swing of the disk 33. The arm member 50 and the cam follower 53 are made of a magnetic material. Since the output surface 33a of the disk 33 is provided on the upper surface of the plate portion 40 attracted to the electromagnetic core 37, the electromagnetic core 37 is cut so as to avoid interference with the cam follower 53 when the plate portion 40 is attracted. A notch 37a is provided.

  On the other hand, the other end portion of the arm member 50 is provided with a pressing portion 54 that contacts the cam follower 25 of the retainer 23. The pressing portion 54 transmits the driving force of the disk 33 input to the cam follower 53 to the intake valve 20.

  In this way, the arm member 50 transmits the driving force of the electromagnetic actuator 30 to the intake valve 20 through its rotation. FIG. 2 shows a schematic diagram of the configuration of the electromagnetically driven valve 1. As shown in the figure, the arm member 50 has a cam follower 53 on which the driving force of the disk 33 acts on a fulcrum 51 constituted by a lash adjuster 52, and a pressing portion 54 that drives the intake valve 20 acts on the fulcrum 51. By being a point, the driving force of the electromagnetic actuator 30 is transmitted to the intake valve 20. Since the intake valve 20 is driven to open and close through the rotation of the arm member 50 in this way, the position of the fulcrum 51 of the arm member 50 depends on the driving force and operating stroke of the electromagnetic actuator 30 and the intake valve 20. It is set based on the relationship between the operating load and the operating stroke.

  For example, if the distance La from the cam follower 53 (power point) to the fulcrum 51 is configured to be longer than the distance Lv from the pressing portion 54 (action point) to the fulcrum 51, the intake valve 20 is driven with a driving force larger than the driving force of the disk 33. Can be driven. For this reason, such a configuration can be suitably used when the operation load of the intake valve 20 is large. On the other hand, if the distance La from the cam follower 53 (power point) to the fulcrum 51 is configured to be shorter than the distance Lv from the pressing portion 54 (action point) to the fulcrum 51, the intake valve 20 has a stroke longer than the operating stroke of the output surface 33a of the disk 33. The operating stroke can be increased. For this reason, such a configuration can be suitably used when it is necessary to increase the valve lift amount of the intake valve 20.

  The arm member 50 is configured so that the position of the fulcrum 51 in the vertical direction and the horizontal direction can be adjusted. The lash adjuster 52 constituting the fulcrum 51 is held by a holding member 55. The lash adjuster 52 is inserted into a through hole 56 formed in the vertical direction of the holding member 55 and supported so as to be movable in the vertical direction. A female screw part 56a is formed on the inner periphery of the upper side of the through hole 56, and a bolt 57 is screwed into the female screw part 56a. The lower end portion 57 a of the bolt 57 is in contact with the upper end of the lash adjuster 52 and receives the pushing-up force of the arm member 50 due to the urging force of the valve spring 24. A nut 58 is screwed into the threaded portion 57 b of the bolt 57 in advance, and the bolt 57 is fixed to the holding member 55 by tightening the nut 58 against the upper surface 55 a of the holding member 55. . Then, by appropriately changing the tightening position of the nut 58 with respect to the bolt 57, the vertical position of the bolt 57 can be adjusted, and the vertical position of the fulcrum 51 of the arm member 50 can be adjusted.

  The holding member 55 is fixed to the case 39 by a fixing bolt 59 and a fixing nut 60. The fixing bolt 59 is inserted into a through hole 39 a formed in the vertical direction of the case 39. The through hole 39 a is formed in a long hole shape along the longitudinal direction of the arm member 50. Then, the horizontal position of the holding member 55 is adjusted by appropriately changing the tightening positions of the fixing bolt 59 and the fixing nut 60 so that the horizontal position of the fulcrum 51 of the arm member 50 can be adjusted.

  As described above, by making it possible to adjust the vertical and horizontal positions of the fulcrum 51 of the arm member 50, the positional relationship between the force point and the action point of the arm member 50, the relationship of the operation stroke, and the like can be corrected. .

  The electromagnetically driven valve 1 configured as described above is driven and controlled by an electronic control unit 70 that controls the internal combustion engine 10. The electronic control unit 70 controls the timing of the valve opening operation and the valve closing operation of the intake valve 20 according to the signals of the sensors that detect the engine operating state of the internal combustion engine 10. The opening / closing drive of the intake valve 20 is performed by the electronic control unit 70 controlling the drive circuit 71 of the electromagnetic actuator 30. Hereinafter, opening / closing driving of the intake valve 20 will be described.

  When the operation of the internal combustion engine 10 is stopped, neither the electromagnetic coil 35 nor the electromagnetic coil 36 of the electromagnetic actuator 30 is energized. In this state, the electromagnetic force does not act on the disk 33. Therefore, as shown in FIG. 3, the intake valve 20, the disk 33, and the arm member 50 have the urging force of the valve spring 24 and the restoring force of the torsion bar spring 42. Is stopped at a position where they are balanced. That is, the intake valve 20 is stopped at an intermediate position between the valve closing state and the valve opening state, and the disk 33 is stopped in a state where the plate portion 40 is at an intermediate position between the electromagnetic core 37 and the electromagnetic core 38. The electronic control unit 70 energizes the electromagnetic coil 36 of the electromagnet 32 disposed below in order to close the intake valve 20.

  When the electromagnetic coil 36 is energized, an electromagnetic force is generated in the electromagnetic core 38, and an attractive force toward the electromagnetic core 38 acts on the plate portion 40 of the disk 33. Due to this suction force, the disk 33 swings in the CCW direction from the intermediate position against the restoring force of the torsion bar spring 42. Along with this swinging, the urging force of the valve spring 24 rotates the arm member 50 following the CCW direction, and the intake valve 20 moves in the valve closing direction. When the plate portion 40 of the disk 33 is attracted to the electromagnetic core 38, the umbrella portion 20a of the intake valve 20 is seated on the valve seat 22 and closed as shown in FIG. When the intake valve 20 is in the closed state, a holding current for holding the intake valve 20 in the closed state is supplied to the electromagnetic coil 36. By supplying the holding current, a magnetic circuit X as shown in FIG. 4 is formed between the plate portion 40 and the electromagnetic core 38, and the state in which the plate portion 40 is attracted to the electromagnetic core 38 is held.

  The electronic control unit 70 starts the opening / closing control of the intake valve 20 from the closed state of the intake valve 20. A solid line A in FIG. 5 indicates the valve lift amount of the intake valve 20 with respect to the time axis. When the intake valve 20 reaches the valve opening start timing T0, the electronic control unit 70 stops the supply of the holding current to the electromagnetic coil 36. When the supply of the holding current is stopped, the electromagnetic force of the electromagnetic core 38 disappears and the attraction force disappears. Therefore, the disk 33 swings in the CW direction toward the intermediate position by the restoring force of the torsion bar spring 42. Accordingly, the output surface 33a of the disk 33 presses the cam follower 53 of the arm member 50, and the arm member 50 rotates in the CCW direction. Then, the pressing portion 54 of the arm member 50 presses the cam follower 25 of the retainer 23, the intake valve 20 moves downward, and the valve lift amount gradually increases.

  At a predetermined timing T1 during the movement of the intake valve 20, the electronic control unit 70 supplies a drive current to the electromagnetic coil 35 of the electromagnet 31 disposed above. When energization to the electromagnetic coil 35 is started, an electromagnetic force is generated in the electromagnetic core 37, and an attractive force toward the electromagnetic core 37 acts on the plate portion 40 of the disk 33. By this suction force, the disk 33 swings in the CW direction beyond the intermediate position shown in FIG. That is, the disk 33 is swung in the CW direction against the urging force of the valve spring 24 and the restoring force of the torsion bar spring 42. Accordingly, the arm member 50 continues to rotate in the CCW direction, and the valve lift amount of the intake valve 20 further increases. Then, at timing T2 when the plate portion 40 of the disk 33 is attracted to the electromagnetic core 37, the intake valve 20 is fully opened as shown in FIG. When the intake valve 20 is fully opened, the electronic control unit 70 supplies a holding current smaller than the drive current to the electromagnetic coil 35 to hold the intake valve 20 in the fully open state.

  When the intake valve 20 is driven in the valve opening direction and when the intake valve 20 is held in the open state, the notch 37a of the electromagnetic core 37 is made of a magnetic material as shown in FIG. The arm member 50 and the cam follower 53 come to be positioned. For this reason, the magnetic circuit Y is formed by the electromagnetic core 37, the arm member 50, the cam follower 53, and the plate portion 40 even at the location where the notch portion 37 a is provided. By forming the magnetic circuit Y in this way, a decrease in electromagnetic force is suppressed.

  When the intake valve 20 reaches the valve closing start timing T <b> 3, the electronic control unit 70 stops supplying the holding current to the electromagnetic coil 35. When the supply of the holding current is stopped, the electromagnetic force of the electromagnetic core 37 disappears and the attractive force disappears. Therefore, the disk 33 moves toward the intermediate position by the urging force of the valve spring 24 and the restoring force of the torsion bar spring 42. Swings in the CCW direction. Along with this swing, the arm member 50 rotates following the CW direction, the intake valve 20 moves upward, and the valve lift amount gradually decreases.

  At a predetermined timing T4 during the movement of the intake valve 20, the electronic control device 70 supplies a drive current to the electromagnetic coil 36 of the electromagnet 32 disposed below. When energization of the electromagnetic coil 36 is started, an electromagnetic force is generated in the electromagnetic core 38, and an attractive force toward the electromagnetic core 38 acts on the plate portion 40 of the disk 33. With this suction force, the disk 33 swings in the CCW direction beyond the intermediate position shown in FIG. That is, the disk 33 is swung in the CCW direction against the restoring force of the torsion bar spring 42. As a result, the arm member 50 continues to rotate in the CW direction, and the valve lift amount of the intake valve 20 further decreases. Then, at the timing T5 when the plate portion 40 of the disk 33 is attracted to the electromagnetic core 38, the umbrella portion 20a of the intake valve 20 is seated on the valve seat 22 and closed as shown in FIG. Since the fulcrum 51 of the arm member 50 is supported by the lash adjuster 52, the influence of thermal expansion or the like of the intake valve 20 or the arm member 50 is absorbed so that the intake valve 20 is surely closed. It is configured.

  In this way, the electronic control device 70 alternately energizes the electromagnetic coil 35 of the electromagnet 31 and the electromagnetic coil 36 of the electromagnet 32 to control the valve opening operation and the valve closing operation of the intake valve 20.

  Further, the electronic control unit 70 performs minute lift control for driving the intake valve 20 in the valve opening direction by a minute amount from the closed state. Such minute lift control is performed in the low rotation and low load region of the internal combustion engine 10 in order to improve the fuel consumption by reducing the pumping loss caused by the throttle valve opening control.

  The broken line B in FIG. 5 shows the valve lift amount of the intake valve 20 when the minute lift control is performed. When the intake valve 20 is in a closed state, a holding current is supplied to the electromagnetic coil 36 of the electromagnet 32 disposed below. When the current supply to the electromagnetic coil 36 is stopped from this state, the intake valve 20 starts moving in the valve opening direction. At this time, the electromagnetic coil 36 is energized again to generate an electromagnetic force in the electromagnetic core 38 that balances the force with which the intake valve 20 is about to move to the intermediate position. Thereby, the valve lift amount of the intake valve 20 is kept at a minute amount b. Then, a drive current is supplied to the electromagnetic core 38 at a predetermined timing, and the intake valve 20 is closed.

  The current supplied to the electromagnetic core 38 when the valve lift amount of the intake valve 20 is kept at the minute amount b by such minute lift control is supplied when the intake valve 20 is kept in the closed state or the opened state. Since it becomes larger than the holding current, the amount of heat generated by the electromagnet 32 increases when the minute lift control is repeated. Therefore, the heat generated by the electromagnet 32 arranged on the cylinder head 11 side is configured to be radiated or transferred to the cylinder head 11 cooled by cooling water or the like.

According to the electromagnetically driven valve of the first embodiment, the following effects can be obtained.
(1) In the first embodiment, the electromagnetically driven valve 1 opens and closes the intake valve 20 by transmitting the driving force of the disk 33 of the electromagnetic actuator 30 to the intake valve 20 through the rotation of the arm member 50. To do. Thus, when the electromagnetic actuator 30 and the intake valve 20 are interlocked via the arm member 50, it is not necessary to arrange the electromagnetic actuator 30 on the operating shaft of the intake valve 20. For this reason, the degree of freedom of arrangement of the electromagnetic actuator 30 can be increased, and restrictions on the layout of the internal combustion engine 10 can be relaxed, for example, by reducing the overall height of the internal combustion engine 10. Further, in the present embodiment, the arm member 50 is formed in a substantially linear shape so that the swinging direction of the disk 33 is opposite to the operation direction of the intake valve 20, but the fulcrum 51 is bent. The swinging direction of the disk 33 can be freely set by forming the arm member 50 in a substantially L shape as a part. For this reason, it is possible to set an arrangement form of the electromagnetic actuator 30 that is optimal for various types of internal combustion engines.

  (2) In the first embodiment, since the fulcrum 51 of the arm member 50 is supported by the lash adjuster 52, the intake valve 20 is securely closed by absorbing the influence of thermal expansion or the like when the intake valve 20 is closed. Can be in a state.

  (3) In the first embodiment, the electromagnetic actuator 30 and the intake valve 20 are interlocked via the arm member 50, so that the electromagnetic of the electromagnet 32 provided on the cylinder head 11 side of the pair of electromagnets 31 and 32. When the coil 36 is energized, the intake valve 20 is driven in the valve closing direction. For this reason, the heat generation of the electromagnet 32 caused by a large current necessary for performing the minute lift control and the heat generation of the electromagnet 32 during the valve closing time set longer than the valve opening time are cooled by cooling water or the like. The cylinder head 11 can be configured to easily dissipate or transfer heat. Thereby, it can suppress that the temperature of the electromagnetic coil 36 of the electromagnet 32 rises exceeding the heat-resistant temperature of a coil, and the electromagnetic force falls by the temperature rise of the electromagnet 32.

  (4) In the first embodiment, the arm member 50 has the cam follower 53 on which the driving force of the disk 33 acts on the fulcrum 51 as the force point, and the pressing portion 54 that drives the intake valve 20 acts on the arm member 50. The driving force of the electromagnetic actuator 30 is transmitted to the intake valve 20. For this reason, the position of the fulcrum 51 can be set so that the driving force and operating stroke of the electromagnetic actuator 30 and the operating load and operating stroke of the intake valve 20 have an optimum relationship.

  For example, if the distance La from the force point to the fulcrum 51 is configured to be longer than the distance Lv from the action point to the fulcrum 51, the intake valve 20 can be driven with a driving force larger than the driving force of the disk 33. For this reason, the amount of current supplied to the electromagnetic coils 35 and 36 of the electromagnets 31 and 32 can be reduced, and the power consumption can be reduced. Such a configuration has a relatively large operating load and a large driving force applied to the electromagnetic actuator 30, such as when driving an exhaust valve that opens in a state where the cylinder pressure is high, such as before the end of the expansion stroke of the internal combustion engine 10. Can be suitably used in cases where such is required.

  On the other hand, when the distance La from the power point to the fulcrum 51 is configured to be shorter than the distance Lv from the action point to the fulcrum 51, the operation stroke of the intake valve 20 can be made larger than the operation stroke of the output surface 33a of the disk 33. The valve lift amount of the intake valve 20 can be increased. Such a configuration can be suitably used when the operating load is relatively small but a large valve lift amount is desired, such as when the intake valve is driven.

  (5) In the first embodiment, the disk 33 of the electromagnetic actuator 30 directly contacts the arm member 50 and rotates the arm member 50 to drive the intake valve 20 to open and close. While increasing the degree of freedom of arrangement of the electromagnetic actuator 30, the number of movable members that operate when opening and closing the intake valve 20 is reduced as much as possible. For this reason, an increase in the transmission efficiency of the movable member and a reduction in the weight of the movable part can be suitably achieved, and the power consumption in the electromagnets 31 and 32 can be reduced.

  (6) In the first embodiment, when the intake valve 20 is driven in the valve opening direction and when the intake valve 20 is held in the valve open state, the notch 37a of the electromagnetic core 37 is made of a magnetic material. The arm member 50 and the cam follower 53 are configured to be positioned. For this reason, the magnetic circuit Y can be formed by the electromagnetic core 37, the arm member 50, the cam follower 53, and the plate portion 40 even at the location where the notch portion 37 a is provided. As described above, even when the cam follower 53 is arranged so as to enter the electromagnetic core 37 to reduce the size of the electromagnetically driven valve 1, the magnetic circuit Y is formed, so that a decrease in electromagnetic force can be suppressed. As a result, power consumption in the electromagnet 31 can be reduced.

  (7) In the first embodiment, since the position of the fulcrum 51 of the arm member 50 is configured to be adjustable, the positional relationship between the power point at which the driving force of the electromagnetic actuator 30 acts and the point at which the intake valve 20 is driven The relation of the operation stroke can be corrected. Therefore, it is possible to adjust the intake valve 20 to have desired opening / closing characteristics by absorbing variations in the shape of the electromagnetic actuator 30 and the arm member 50 and the like.

  (8) In the first embodiment, since the position of the fulcrum 51 of the arm member 50 can be adjusted in the vertical direction, the operation timing of the disk 33 and the operation timing of the intake valve 20 can be accurately aligned. Further, since the position of the fulcrum 51 can be adjusted in the swinging direction of the disk 33, an intermediate position that is balanced by the urging force of the valve spring 24 and the restoring force of the torsion bar spring 42 can be adjusted. Therefore, the electromagnetic force of the electromagnets 31 and 32 acting on the disk 33 can be prevented from being biased, and the intake valve 20 can be opened and closed reliably.

  (9) In the first embodiment, since the position of the fulcrum 51 of the arm member 50 can be adjusted in the horizontal direction, the intake valve 20 is driven with respect to the distance between the fulcrum 51 and the force point at which the drive force of the disk 33 acts. The ratio of the distance between the action point and the fulcrum 51 can be changed. For this reason, the operation stroke of the disk 33 and the operation stroke of the intake valve 20 can be accurately aligned. FIG. 7 shows a schematic diagram of the operation stroke of the disk 33 and the intake valve 20 with respect to the horizontal position of the fulcrum 51. Even if the operating stroke Sd of the disk 33 is the same, as shown in FIG. 7A, when the fulcrum 51 is on the operating point side, the operating stroke Sv1 of the intake valve 20 becomes small, and FIG. As shown, when the fulcrum 51 is on the power point side, the operation stroke Sv2 of the intake valve 20 is increased. Therefore, the operation stroke of the intake valve 20 can be adjusted to a desired valve lift amount, and the intended performance of the internal combustion engine 10 can be extracted.

  (10) In the first embodiment, the electromagnetic actuator 30 opens and closes the two intake valves 20 provided in the same cylinder 12 via the arm member 50, so that the electromagnetic actuator 30 is provided for each intake valve 20. This is unnecessary, and the number of electromagnetic actuators 30 can be reduced. For this reason, the mounting space can be reduced and the cost can be reduced. Further, by reducing the number of electromagnetic actuators 30, it is possible to reduce the number of movable members that operate when the intake valve 20 is driven to open and close. By increasing the transmission efficiency of the movable members and reducing the weight of the movable parts, The power consumption in the electromagnets 31 and 32 can be reduced. Further, when the number of electromagnetic actuators 30 is reduced, the number of drive circuits 71 provided for each electromagnetic actuator 30 can be reduced, and therefore, further cost reduction can be achieved.

  (11) In the first embodiment, the arm member 50 presses the cam follower 25 of the retainer 23 connecting the two intake valves 20 to drive the two intake valves 20 to open and close in synchronization. It is not necessary to provide the spring 24 and the cam follower 25 in each intake valve 20, and the number of components can be reduced. For this reason, simplification of a structure, weight reduction of a movable part, and cost reduction can be achieved.

  (12) In the first embodiment, the disk 33 of the electromagnetic actuator 30 is supported so as to be swingable about the shaft portion 41, so that the disk 33 is compared with an electromagnetic actuator configured to move in parallel. While securing the operating stroke, the distance between the disk 33 and the electromagnets 31 and 32 can be shortened when the disk 33 is attracted. For this reason, since a large electromagnetic force can be applied to the disk 33, the amount of current supplied to the electromagnetic coils 35 and 36 of the electromagnets 31 and 32 can be reduced, and the power consumption can be reduced.

(Second Embodiment)
Hereinafter, with reference to FIG. 8, 2nd Embodiment which actualized the electromagnetically driven valve which concerns on this invention is described. In the second embodiment, the configuration in which the electromagnetic actuator 30 and the intake valve 20 are interlocked via the arm member 50 is the same as in the first embodiment, but the position of the fulcrum 51 of the arm member 50 is the engine of the internal combustion engine 10. The point which is comprised so that it may become variable according to a driving | running state differs from 1st Embodiment. In the embodiments described below, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions thereof are omitted or simplified.

  FIG. 8 is a cross-sectional view showing the configuration of the electromagnetically driven valve 2 according to the second embodiment. The electromagnetically driven valve 2 includes an intake valve 20, an electromagnetic actuator 30, and an arm member 50 that is interposed between the intake valve 20 and the electromagnetic actuator 30.

  The arm member 50 is configured such that the position of the fulcrum 51 is variable. A fulcrum 51 of the arm member 50 is supported by a lash adjuster 52. The lash adjuster 52 is inserted into a through hole 62a formed in the vertical direction of the holding member 62, and is supported so as to be movable in the vertical direction. The upper end surface 52a of the lash adjuster 52 is configured so that the hydraulic pressure supplied from the hydraulic circuit 72 acts, and the lash adjuster 52 drives the inside of the through hole 62a in the vertical direction by controlling the hydraulic circuit 72.

  The holding member 62 is slidably supported between the slopes 39b and 39c of the case 39 formed in parallel with each other. The upper end surface 62b of the holding member 62 is configured so that the hydraulic pressure supplied from the hydraulic circuit 72 is applied. The hydraulic circuit 72 is controlled to drive the holding member 62 in the directions of the inclined surfaces 39b and 39c.

  In this way, the position of the lash adjuster 52 can be changed in the vertical direction and the horizontal direction by the control of the hydraulic circuit 72, so that the position of the fulcrum 51 of the arm member 50 can be moved to a desired position. Since the operation stroke of the intake valve 20 relative to the operation stroke of the disk 33 can be changed by moving the position of the fulcrum 51, the valve lift amount of the intake valve 20 can be configured to be variable. Here, the lash adjuster 52, the holding member 62, and the hydraulic circuit 72 correspond to fulcrum position changing means.

  The hydraulic circuit 72 is driven and controlled by the electronic control unit 70. The electronic control unit 70 responds to the signals of the sensors that detect the engine operating state of the internal combustion engine 10, such as an air flow meter that detects the intake air amount, an NE sensor that detects the engine speed, and an accelerator sensor that detects the accelerator amount. The hydraulic circuit 72 is driven and controlled, and the valve lift amount of the intake valve 20 is controlled. For example, in the low rotation and low load region of the internal combustion engine 10, the valve lift amount of the intake valve 20 is reduced in order to reduce the pumping loss caused by the throttle valve opening control. On the other hand, in the high rotation and high load region of the internal combustion engine 10, the valve lift amount of the intake valve 20 is increased in order to improve intake charging efficiency and ensure a large engine output.

  Thus, the position of the fulcrum 51 of the arm member 50 is changed according to the engine operating state of the internal combustion engine 10, and the valve lift amount of the intake valve 20 is changed. In the above configuration, the position of the fulcrum 51 is changed using the hydraulic circuit 72, but the position of the fulcrum 51 may be changed using an electric actuator or the like.

According to the electromagnetically driven valve of the second embodiment, the following effects can be obtained in addition to the effects (1) to (12) of the first embodiment.
(13) In the second embodiment, since the position of the fulcrum 51 of the arm member 50 is changed by the control of the electronic control unit 70, the intake valve 20 is changed according to the engine operating state of the internal combustion engine 10. The valve lift amount can be made variable. For this reason, the engine characteristics of the internal combustion engine 10 can be improved by changing the valve characteristics. Further, even when the valve lift amount or the like of the intake valve 20 changes over time due to the operation of the internal combustion engine 10, the position of the fulcrum 51 of the arm member 50 can be finely adjusted with the above-described configuration. The durability reliability can be improved.

(Third embodiment)
A third embodiment that embodies the electromagnetically driven valve according to the present invention will be described below with reference to FIGS. In the third embodiment, the configuration in which the electromagnetic actuator 30 and the intake valve 20 are interlocked via an arm member to open and close the two intake valves 20 in the same cylinder 12 is the same as in the first embodiment. However, it differs from the first embodiment in that the two intake valves 20 are not connected by a retainer. In the embodiments described below, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions thereof are omitted or simplified.

  FIG. 9 is a cross-sectional view showing the configuration of the electromagnetically driven valve 3 according to the third embodiment. The electromagnetically driven valve 3 includes an intake valve 20, an electromagnetic actuator 30, an intermediate stem 80 driven by the electromagnetic actuator 30, and arm members 90 and 91 interposed between the intermediate stem 80 and the intake valve 20. .

  Two intake valves 20 are provided in the cylinder 12, and each valve stem 20 b is supported by a valve guide 21 provided in the cylinder head 11 so as to reciprocate in the axial direction. A retainer 27 is provided for each intake valve 20 at the upper portion of the valve stem 20b. A valve spring 28 is disposed in a compressed state between the cylinder head 11 and the retainer 27, and the intake valve 20 is urged in the valve closing direction by the valve spring 28.

  The electromagnetic actuator 30 has the same configuration as that of the first embodiment, and the driving force is applied to the intermediate stem 80 by swinging of the disk 33 disposed between the electromagnets 31 and 32 provided opposite to each other. introduce.

  The intermediate stem 80 is supported by an intermediate stem guide 81 provided on the case 39 so as to reciprocate in the vertical direction. A cam follower 82 is provided at the upper end of the intermediate stem 80 so as to come into contact with the output surface 33 a provided at the tip of the disk 33. The cam follower 82 is directly transmitted with the driving force generated by the swinging of the disk 33, whereby the intermediate stem 80 reciprocates in the vertical direction.

  The arm members 90 and 91 are provided corresponding to the two intake valves 20, respectively, and are disposed at positions that are symmetrical with respect to the moving axis of the intermediate stem 80. The arm members 90 and 91 are supported so as to be rotatable around fulcrums 92 and 93 formed at one end on the outer side in the longitudinal direction. The fulcrums 92 and 93 are supported by the lash adjuster 52. Abutting portions 94 and 95 that abut against the lower end surface 83 of the intermediate stem 80 are provided at the other end portions inside the arm members 90 and 91. The driving force of the disk 33 is transmitted to the contact portions 94 and 95 via the intermediate stem 80. In addition, pressing portions 96 and 97 that abut against the upper end surface of the valve stem 20b of the intake valve 20 are provided in the middle portions of the arm members 90 and 91 in the longitudinal direction. The pressing portions 96 and 97 transmit the driving force of the disk 33 input to the contact portions 94 and 95 to the intake valve 20.

  The opening / closing drive of the intake valve 20 is performed by alternately supplying current to the electromagnetic coil 35 of the electromagnet 31 and the electromagnetic coil 36 of the electromagnet 32 as in the first embodiment. When the electromagnetic coil 35 of the electromagnet 31 disposed above is energized, an electromagnetic force is generated in the electromagnetic core 37 and the disk 33 is attracted to the electromagnetic core 37. Accordingly, the urging force of the valve spring 28 causes the arm member 90 to rotate in the CCW direction and the arm member 91 to rotate in the CW direction, so that the contact portions 94 and 95 push the intermediate stem 80 upward. Then, when the disk 33 is attracted to the electromagnetic core 37, the intake valve 20 is closed as shown in FIG.

  When the energization of the electromagnetic coil 35 is stopped and the electromagnetic coil 36 of the electromagnet 32 disposed below is energized from the state in which the intake valve 20 is closed, an electromagnetic force is generated in the electromagnetic core 38. The disk 33 is attracted to the electromagnetic core 38. As a result, the output surface 33a of the disk 33 pushes down the intermediate stem 80, causing the arm member 90 to rotate in the CW direction and the arm member 91 to rotate in the CCW direction. When the pressing portions 96 and 97 push down the intake valve 20 against the urging force of the valve spring 28 and the disk 33 is attracted to the electromagnetic core 38, the intake valve 20 is fully opened as shown in FIG. It becomes a state.

  When the energization of the electromagnetic coil 36 is stopped and the electromagnet 31 of the electromagnet 31 is energized from the fully open state of the intake valve 20, the disk 33 is attracted to the electromagnetic core 37 and the intake valve 20 is energized. Returns to the closed state as shown in FIG. In this way, by controlling the current supplied to the electromagnetic coil 35 and the electromagnetic coil 36, the intake valve 20 is driven to open and close in synchronization.

According to the electromagnetically driven valve of the third embodiment, in addition to the effects (1), (2), (4), (10), (12) of the first embodiment, the following effects can be obtained. Can do.
(14) In the third embodiment, the electromagnetic actuator 30 opens and closes the two intake valves 20 by rotating the two arm members 90 and 91 provided corresponding to the two intake valves 20, respectively. To drive. Therefore, by adjusting the positions of the fulcrums 92 and 93 of the arm members 90 and 91, the valve lift amount of the intake valve 20 driven by the arm members 90 and 91 can be individually adjusted. Accordingly, it is possible to easily adjust the operation characteristics of each intake valve 20 while reducing the number of electromagnetic actuators 30 by opening and closing the two intake valves 20 by one electromagnetic actuator 30.

(Fourth embodiment)
Hereinafter, with reference to FIGS. 11-13, 4th Embodiment which actualized the electromagnetically driven valve which concerns on this invention is described. In the fourth embodiment, the configuration in which the electromagnetic actuator 30 and the intake valve are interlocked via the arm member 50 is the same as that of the first embodiment, but only one intake valve is provided in the cylinder 12, and the intake valve The point that the planar shape of the umbrella part is formed in a shape other than a circle is different from the first embodiment. In the embodiments described below, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions thereof are omitted or simplified.

  FIG. 11 is a cross-sectional view showing the configuration of the electromagnetically driven valve 4 according to the fourth embodiment. The electromagnetically driven valve 4 includes an intake valve 100, an electromagnetic actuator 30, and an arm member 50 that is interposed between the intake valve 100 and the electromagnetic actuator 30.

  One intake valve 100 is provided in the cylinder 12, and includes an umbrella portion 100 a provided at the lower end and a valve stem 100 b supported by the cylinder head 11. The umbrella 100a is formed in a shape other than a circle when viewed from below. FIG. 12 shows the arrangement of intake valves and exhaust valves when the cylinder 12 is viewed from below. The upper surface in the cylinder 12 is composed of two surfaces 12a and 12b, an intake valve is disposed on the surface 12a, and an exhaust valve is disposed on 12b. FIG. 12A shows an arrangement in the case where the planar shape of the umbrella portion of each valve is formed in a circle as in the first embodiment, and two intake valves and two exhaust valves are provided. In the present embodiment, as shown in FIGS. 12B and 12C, the intake valve 100 and the exhaust valve in which the planar shape of the umbrella portion 100a is formed in a shape other than a circle are used. FIG. 12B shows the umbrella portion 100a having an elliptical planar shape, and FIG. 12C shows the umbrella portion 100a having a different planar shape. 12 (b) and FIG. 12 (c), the planar shape of the umbrella portion of the intake valve and the exhaust valve is the opening area of the umbrella portion of the intake valve and the exhaust valve shown in FIG. 12 (a). It is formed so as to have substantially the same size.

  The valve stem 100b is supported by a valve guide 101 provided in the cylinder head 11 so as to be capable of reciprocating in the axial direction. The support portion of the valve stem 100b is provided with a rotation prevention mechanism for preventing the intake valve 100 from rotating around the valve stem 100b. 13 is a cross-sectional view taken along the line CC of FIG. As shown to Fig.13 (a), the cross section of the sliding part 100c of the outer periphery of the valve stem 100b is formed in the rectangular shape. And the sliding part 101a of the inner periphery of the valve guide 101 is formed in substantially the same shape as the sliding part 100c so that it may loosely fit with the sliding part 100c. In this way, the sliding portion 100c and the sliding portion 101a are formed in a rectangular shape to constitute a rotation prevention mechanism, and the umbrella portion 100a formed in a planar shape other than a circle is prevented from rotating. In addition, you may comprise a rotation prevention mechanism by forming 2 surface width in the sliding part 100c and the sliding part 101a, as shown in FIG.13 (b).

  When the intake valve 100 moves upward, the umbrella portion 100a is seated on the valve seat 102 provided in the cylinder head 11, and the combustion chamber 13 and the intake port 14 are shut off. Further, when the intake valve 100 moves downward, the umbrella portion 100a is separated from the valve seat 102, and the combustion chamber 13 and the intake port 14 are communicated with each other. A retainer 103 is provided on the upper portion of the valve stem 20b. A valve spring 104 is disposed in a compressed state between the cylinder head 11 and the retainer 103, and the intake valve 100 is urged in the valve closing direction by the valve spring 104.

  The electromagnetic actuator 30 has the same configuration as that of the first embodiment, and the driving force is applied to the arm member 50 by the swing of the disk 33 disposed between the electromagnets 31 and 32 provided to face each other. introduce. The arm member 50 is supported so as to be rotatable around a fulcrum 51 formed in the middle in the longitudinal direction. A fulcrum 51 of the arm member 50 is supported by a lash adjuster 52. A cam follower 53 is provided at one end of the arm member 50 on the electromagnetic actuator 30 side so as to come into contact with an output surface 33 a provided at the tip of the disk 33. The other end of the arm member 50 is provided with a pressing portion 54 that contacts the upper end of the valve stem 100b of the intake valve 100. The pressing portion 54 transmits the driving force of the disk 33 input to the cam follower 53 to the intake valve 100.

  The opening / closing drive of the intake valve 100 is performed by alternately supplying current to the electromagnetic coil 35 of the electromagnet 31 and the electromagnetic coil 36 of the electromagnet 32, as in the first embodiment. That is, when the electromagnetic coil 36 of the electromagnet 32 disposed below is energized, the intake valve 100 is closed, and when the electromagnetic coil 35 of the electromagnet 31 disposed above is energized, the intake valve 100 is closed. Is fully open.

According to the electromagnetically driven valve of the fourth embodiment, in addition to the effects (1) to (6) and (12) of the first embodiment, the following effects can be obtained.
(15) In the fourth embodiment, the intake valve 100 is formed such that the planar shape of the umbrella part 100a is an elliptical shape as shown in FIG. 12B or an irregular shape as shown in FIG. Therefore, the plurality of intake valves in the cylinder 12 can be formed as one intake valve 100 having an equivalent opening area. For this reason, while ensuring the intake / exhaust performance of the internal combustion engine, the number of intake valves and the number of electromagnetic actuators can be reduced, and the mounting space can be reduced and the cost can be reduced.

  (16) In the fourth embodiment, the intake valve 100 has a rotation prevention mechanism that prevents the valve stem 100b from rotating about the valve stem 100b, so that the umbrella portion 100a formed in a planar shape other than a circle rotates. Thus, when the intake valve 100 is closed, the umbrella portion 100a can be surely brought into a closed state in which it is seated on the valve seat 102.

(Fifth embodiment)
Hereinafter, with reference to FIGS. 14-16, 5th Embodiment which actualized the electromagnetically driven valve which concerns on this invention is described. In the fifth embodiment, the configuration for interlocking the electromagnetic actuator 30 and the intake valve via the arm member is the same as in the first embodiment, but the electromagnetic actuator 30 opens and closes a plurality of intake valves provided between other cylinders. The driving point is different from the first embodiment. In the embodiments described below, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions thereof are omitted or simplified.

  FIG. 14 is a cross-sectional view showing the configuration of the electromagnetically driven valve 5 according to the fifth embodiment. The electromagnetically driven valve 5 includes an intake valve 20, an electromagnetic actuator 30, an intermediate stem 110 driven by the electromagnetic actuator 30, and arm members 120 and 121 interposed between the intermediate stem 110 and the intake valve 20. .

  Two intake valves 20 are provided in each of the cylinder 12 and the cylinder 15, and each valve stem 20 b is supported by a valve guide 21 provided in the cylinder head 11 so as to be capable of reciprocating in the axial direction. A retainer 23 is provided at the upper end of the valve stem 20 b of the intake valve 20. The retainer 23 is configured to connect two intake valves 20 provided in the cylinders 12 and 15, whereby the two intake valves 20 move in synchronization with the axial direction. A valve spring 24 is disposed in a compressed state between the cylinder head 11 and the retainer 23, and the intake valve 20 is urged in the valve closing direction by the valve spring 24. In addition, a cam follower 25 that abuts on the arm members 120 and 121 is provided at the center of the retainer 23.

  The electromagnetic actuator 30 has the same configuration as that of the first embodiment, and the driving force is applied to the intermediate stem 110 by the swing of the disk 33 disposed between the electromagnets 31 and 32 provided to face each other. introduce.

  The intermediate stem 110 is supported by an intermediate stem guide 111 provided in the case 39 so as to reciprocate in the vertical direction. A cam follower 112 is provided at the upper end of the intermediate stem 110 so as to come into contact with the output surface 33 a provided at the tip of the disk 33. The cam follower 112 is directly transmitted with the driving force generated by the swinging of the disk 33, whereby the intermediate stem 110 reciprocates in the vertical direction.

  The arm member 120 is provided at the upper part of the cylinder 12, and the arm member 121 is provided at the upper part of the cylinder 15. The arm members 120 and 121 are supported so as to be rotatable around fulcrums 122 and 123 formed at one end on the inner side in the longitudinal direction. The fulcrums 122 and 123 are supported by the lash adjuster 52. Abutting portions 124 and 125 that abut against two lower end surfaces 113 and 114 that are branched and provided below the intermediate stem 110 are provided in the middle portions of the arm members 120 and 121 in the longitudinal direction. The driving force of the disk 33 is transmitted to the contact portions 124 and 125 via the intermediate stem 110. In addition, pressing portions 126 and 127 that are in contact with the cam follower 25 of the retainer 23 are provided at the other end portions outside the arm members 120 and 121. The pressing parts 126 and 127 transmit the driving force of the disk 33 input to the contact parts 124 and 125 to the intake valve 20.

  The opening / closing drive of the intake valve 20 is performed by alternately supplying a current to the electromagnetic coil 35 of the electromagnet 31 and the electromagnetic coil 36 of the electromagnet 32 as in the first embodiment. When the electromagnetic coil 35 of the electromagnet 31 disposed above is energized, an electromagnetic force is generated in the electromagnetic core 37 and the disk 33 is attracted to the electromagnetic core 37. Accordingly, the urging force of the valve spring 24 causes the arm member 120 to rotate in the CW direction and the arm member 121 to rotate in the CCW direction, so that the contact portions 124 and 125 push the intermediate stem 110 upward. When the disk 33 is attracted to the electromagnetic core 37, the intake valve 20 is closed as shown in FIG.

  When the energization of the electromagnetic coil 35 is stopped and the electromagnetic coil 36 of the electromagnet 32 disposed below is energized from the state in which the intake valve 20 is closed, an electromagnetic force is generated in the electromagnetic core 38. The disk 33 is attracted to the electromagnetic core 38. As a result, the output surface 33a of the disk 33 pushes down the intermediate stem 110, causing the arm member 120 to rotate in the CCW direction and the arm member 121 to rotate in the CW direction. When the pressing portions 126 and 127 push down the intake valve 20 against the urging force of the valve spring 24 and the disk 33 is attracted to the electromagnetic core 38, the intake valve 20 is fully opened as shown in FIG. It becomes a state.

  When the energization of the electromagnetic coil 36 is stopped and the electromagnet 31 of the electromagnet 31 is energized from the fully open state of the intake valve 20, the disk 33 is attracted to the electromagnetic core 37 and the intake valve 20 is energized. Returns to the closed state as shown in FIG. In this way, by controlling the current supplied to the electromagnetic coil 35 and the electromagnetic coil 36, the intake valve 20 provided between the other cylinders is driven to open and close in synchronization. For example, when the configuration of the electromagnetically driven valve 5 is applied to a four-cylinder internal combustion engine, the intake valves 20 of the first cylinder and the fourth cylinder are driven to open and close by one electromagnetic actuator 30, and the second and third cylinders are driven. The intake valve 20 can be configured to be opened and closed by another electromagnetic actuator 30.

  Further, by using the electromagnetically driven valve 5 as described above, the drive mechanism of the intake valve and the exhaust valve of the internal combustion engine 10 can be configured as follows. FIG. 16 shows a schematic diagram of the drive mechanism 130 for the intake valve and the exhaust valve. The cylinder 131 and the cylinder 132 are each provided with two intake valves 133 and two exhaust valves 134. The total four intake valves 133 of the cylinder 131 and the cylinder 132 use the configuration of the electromagnetically driven valve 5 and are opened and closed by one electromagnetic actuator 135. On the other hand, the two exhaust valves 134 in the cylinder 131 use the configuration of the electromagnetically driven valve 1 of the first embodiment and the like, and are opened and closed by a single electromagnetic actuator 135. Similarly, the two exhaust valves 134 in the cylinder 132 are opened and closed by one electromagnetic actuator 135. The electromagnetic actuators 135 that drive the intake valve 133 and the exhaust valve 134 are commonly used.

  In general, the exhaust valve 134 is driven to open in a state where the pressure in the cylinder is high, such as before the end of the expansion stroke of the internal combustion engine 10, so that the operation load becomes relatively large. On the other hand, the intake valve 133 is driven to open and close in a state where the pressure in the cylinder is lower than that of the exhaust valve 134, so that the operation load is relatively small. For this reason, when the four intake valves 133 are opened / closed by one electromagnetic actuator 135 and the two exhaust valves 134 are opened / closed by the commonly used electromagnetic actuator 135 as in the drive mechanism 130, The operating load borne by each electromagnetic actuator 135 can be equalized. In this way, the intake valve 133 and the exhaust valve 134 can be efficiently opened and closed while the electromagnetic actuator 135 is shared.

  As described above, the configuration is the same in that the electromagnetic actuator is shared and the number of intake valves that are opened and closed by one electromagnetic actuator is larger than the number of exhaust valves that are opened and closed by one electromagnetic actuator. The present invention can also be applied to a drive mechanism for an intake valve and an exhaust valve in a cylinder. For example, two intake valves in the same cylinder can be driven to open and close by one electromagnetic actuator, and two exhaust valves can be driven to open and close by one electromagnetic actuator. Even with this configuration, similarly to the drive mechanism 130, the intake valve and the exhaust valve can be efficiently opened and closed while the electromagnetic actuator is shared.

According to the electromagnetically driven valve of the fifth embodiment, in addition to the effects (1), (2), (4), (12) of the first embodiment, the following effects can be obtained.
(17) In the fifth embodiment, the electromagnetic actuator 30 opens and closes the intake valve 20 provided between the other cylinders via the arm members 120 and 121 in synchronization with each other, so that the number of the electromagnetic actuators 30 can be further reduced. it can. For this reason, by using the configuration of the electromagnetically driven valve 5, the mounting space can be reduced, the cost can be reduced, and the power consumption can be further reduced.

  (18) In the fifth embodiment, in the drive mechanism 130 using the electromagnetically driven valve 5, the electromagnetic actuator 135 used for opening and closing the intake valve 133 and the electromagnetic actuator 135 used for opening and closing the exhaust valve 134 are shared. Since it is used, it is possible to easily manage components in the manufacturing process.

  (19) In the fifth embodiment, in the driving mechanism 130 using the electromagnetically driven valve 5, the number of intake valves 133 that are driven to open and close by one electromagnetic actuator 135 is the number of exhaust valves that are driven to open and close by one electromagnetic actuator 135. It is comprised so that it may exceed the number of 134. For this reason, the operation load borne by the electromagnetic actuator 135 of the intake valve 133 and the operation load borne by the electromagnetic actuator 135 of the exhaust valve 134 can be equalized. Accordingly, the intake valve 133 and the exhaust valve 134 can be efficiently opened and closed while the electromagnetic actuator 135 is made common, and the power consumption of the electromagnetically driven valve in the entire internal combustion engine 10 can be suitably reduced.

In addition, you may change the said embodiment as follows.
-In 1st, 3rd, 4th embodiment, as shown in FIG. 2, the arm member 50 is the end which the driving force of the electromagnetic actuator 30 acts with respect to the fulcrum 51 formed in the middle part of the longitudinal direction. The cam follower 53 on the part side is used as a force point, and the other end side pressing part 54 that drives the intake valves 20 and 100 is rotated as an action point. However, the arrangement of the fulcrum, force point, and action point is changed. May be. For example, as shown in FIG. 17A, a fulcrum 51 of the arm member 50 is formed at one end, a pressing portion 54 (operation point) for driving the intake valve 20 is formed in the middle, and the electromagnetic actuator 30 is formed. A cam follower 53 (power point) on which the driving force is applied may be formed at the other end. With this configuration, since the distance La from the power point to the fulcrum is longer than the distance Lv from the action point to the fulcrum, the engine valve can be driven with a driving force larger than the driving force of the electromagnetic actuator 30. . Such a configuration can be suitably used when opening and closing an exhaust valve having a relatively large operating load. Further, as shown in FIG. 17B, a fulcrum 51 of the arm member 50 is formed at one end, a cam follower 53 (power point) on which the driving force of the electromagnetic actuator 30 acts is formed in the middle, and an intake valve A pressing portion 54 (action point) for driving 20 may be formed at the other end portion. If comprised in this way, since distance La from a power point to a fulcrum is comprised shorter than distance Lv from an action point to a fulcrum, an engine valve can be driven with an operation stroke larger than the operation stroke of electromagnetic actuator 30. . Such a configuration can be suitably used in the case of opening and closing an intake valve that requires a relatively small operating load but requires a certain operating stroke.

  In the first to fifth embodiments, the disk 33 as the output member of the electromagnetic actuator 30 is supported so as to be swingable between a pair of electromagnets 31 and 32 provided to face each other. You may be supported so that a parallel movement is possible between a pair of electromagnets provided facing each other. FIG. 18 is a cross-sectional view showing the configuration of the electromagnetically driven valve 6 that opens and closes the intake valve 20 by using an electromagnetic actuator 140 in which an armature as an output member is supported so as to be movable in parallel between a pair of electromagnets. It is. Since the configuration of the intake valve 20 and the arm member 50 is the same as that of the first embodiment, the description thereof is omitted. The electromagnetic actuator 140 includes a pair of electromagnets 141 and 142 and an armature 143 disposed between the electromagnets 141 and 142. Stem portions 143a and 143b extending from the armature 143 in the vertical direction are loosely fitted in the guide portions 144a and 144b of the case 144, respectively, so that the armature 143 is supported so as to be movable in the vertical direction. A retainer 145 is provided on the stem portion 143 b below the armature 143. A spring 146 is disposed in a compressed state between the case 144 and the retainer 145, and the armature 143 is biased upward by the spring 146. When no current is supplied to the electromagnetic coils 147 and 148 of the electromagnets 141 and 142, the valve spring 24 and the spring 146 are balanced, and the armature 143 and the intake valve 20 are in the middle positions of the operation stroke. When current is alternately supplied to the electromagnetic coils 147 and 148, electromagnetic force is alternately generated in the electromagnetic cores 149 and 150 of the electromagnets 141 and 142, and the armature 143 is attracted to the electromagnetic cores 149 and 150 and translated in the vertical direction. To do. Then, the arm member 50 is rotated by the parallel movement of the armature 143, and the intake valve 20 is driven to open and close. Even when the electromagnetically driven valve 6 configured as described above is used, the intake valve 20 can be reliably opened and closed similarly to the first embodiment.

  In the first to fifth embodiments, the disk 33 and the intake valves 20, 100 are operated strokes when neither the electromagnetic coil 35 nor the electromagnetic coil 36 is energized, such as when the operation of the internal combustion engine 10 is stopped. The permanent magnet is further arranged in the electromagnetic actuator 30 and the intake valves 20 and 100 are held in the closed state by the cooperative action of the permanent magnet and the electromagnets 31 and 32. May be.

  In the first to third embodiments, two intake valves 20 in the same cylinder are driven to open and close by one electromagnetic actuator 30, but one electromagnetic actuator 30 for each intake valve 20. May be provided, and the opening / closing drive may be performed for each intake valve 20.

  In the first to third and fifth embodiments, the configuration of the electromagnetically driven valve in the case where two intake valves 20 are provided for each cylinder is shown. However, one or three or more intake valves are provided for each cylinder. Even when 20 is provided, the electromagnetically driven valve can be configured using the same principle as in the above embodiment.

  In the first to fifth embodiments, the fulcrum of the arm members 50, 90, 91, 120, 121 is supported by the lash adjuster 52, but the fulcrum may be supported by the rotation shaft.

  In the first to fifth embodiments, the configuration of the electromagnetically driven valve that opens and closes the engine valve of the internal combustion engine 10 has been shown, but the open / close valve used for other purposes also uses the same principle as in the above embodiment. An electromagnetically driven valve can be configured.

Sectional drawing which shows the structure of the electromagnetically driven valve which concerns on 1st Embodiment. Schematic of the configuration of an electromagnetically driven valve. The state diagram of an electromagnetically driven valve when no current is supplied to the electromagnetic coil. The state diagram of an electromagnetically driven valve when the intake valve is closed. The time chart which shows the valve lift amount of an intake valve. The state diagram of an electromagnetically driven valve when the intake valve is fully open. (A), (b) is a schematic diagram which shows the relationship between the fulcrum of an arm member, and an operating stroke. Sectional drawing which shows the structure of the electromagnetically driven valve which concerns on 2nd Embodiment. Sectional drawing which shows the structure of the electromagnetically driven valve which concerns on 3rd Embodiment. The state diagram of an electromagnetically driven valve when the intake valve is fully open. Sectional drawing which shows the structure of the electromagnetically driven valve which concerns on 4th Embodiment. (A), (b), (c) is a top view which shows the planar shape of the umbrella part of a valve | bulb, and arrangement | positioning in the cylinder of a valve | bulb. (A), (b) is sectional drawing which shows a rotation prevention mechanism. Sectional drawing which shows the structure of the electromagnetically driven valve which concerns on 5th Embodiment. The state diagram of an electromagnetically driven valve when the intake valve is fully open. The schematic diagram of the drive mechanism of an intake valve and an exhaust valve. (A), (b) is a schematic diagram which shows the arrangement | sequence of the fulcrum, force point, and action point of an arm member. Sectional drawing which shows the structure of the electromagnetically driven valve in another example.

Explanation of symbols

  1, 2, 3, 4, 5 ... Electromagnetically driven valve, 10 ... Internal combustion engine, 11 ... Cylinder head, 12 ... Cylinder, 20, 100 ... Intake valve, 23, 27, 103 ... Retainer, 24, 28, 104 ... Valve Spring, 25 ... cam follower, 30 ... Electromagnetic actuator, 31, 32 ... Electromagnet, 33 ... Disc, 35, 36 ... Electromagnetic coil, 37, 38 ... Electromagnetic core, 42 ... Torsion bar spring, 50, 90, 91, 120, 121 ... arm members, 51, 92, 93, 122, 123 ... fulcrums, 52 ... lash adjusters, 53 ... cam followers, 54, 96, 97, 126, 127 ... pressing parts, 70 ... electronic control units, 71 ... drive circuits, 72 ... Hydraulic circuit, 80,110 ... Intermediate stem, 94,95,124,125 ... Contact part, 130 ... Drive mechanism.

Claims (20)

An electromagnetic actuator having a pair of electromagnets provided opposite to each other, and an output member that is disposed between the electromagnets and that is activated by the electromagnetic force of the electromagnets;
An engine valve of an internal combustion engine supported so as to be capable of reciprocating;
An arm member rotatably supported around a predetermined fulcrum,
An electromagnetically driven valve that transmits a driving force of an output member of the electromagnetic actuator to the engine valve via rotation of the arm member, and opens and closes the engine valve. The electromagnetically driven valve according to claim 1,
The electromagnetically driven valve, wherein the arm member is supported by a lash adjuster at the fulcrum. The electromagnetically driven valve according to claim 1 or 2,
Among the pair of electromagnets, the electromagnetic valve is driven in a valve closing direction when energization is performed on an electromagnet provided on a cylinder head side that supports the engine valve. . In the electromagnetically driven valve according to any one of claims 1 to 3,
The electromagnetically driven valve characterized in that the arm member has a distance between a force point at which the driving force of the output member acts and the fulcrum is longer than a distance between an action point that drives the engine valve and the fulcrum. In the electromagnetically driven valve according to any one of claims 1 to 3,
The electromagnetically driven valve is characterized in that the arm member has a distance between a force point at which the driving force of the output member acts and the fulcrum is shorter than a distance between an action point that drives the engine valve and the fulcrum. In the electromagnetically driven valve according to any one of claims 1 to 5,
The electromagnetic drive valve, wherein the output member directly contacts the arm member to rotate the arm member to open and close the engine valve. The electromagnetically driven valve according to claim 6,
The said arm member is comprised with a magnetic body. The electromagnetically driven valve characterized by the above-mentioned. In the electromagnetically driven valve according to any one of claims 1 to 7,
The said arm member is comprised so that adjustment of the position of the said fulcrum is possible. The electromagnetically driven valve characterized by the above-mentioned. The electromagnetically driven valve according to claim 8,
The said arm member is comprised so that the position of the said fulcrum can move to the operating direction of the said output member. The electromagnetically driven valve characterized by the above-mentioned. The electromagnetically driven valve according to claim 8,
The arm member is configured to be able to change a ratio of a distance between the fulcrum and the operating point that drives the engine valve with respect to the distance between the fulcrum and the power point at which the driving force of the output member acts. An electromagnetically driven valve. In the electromagnetically driven valve according to any one of claims 1 to 10,
An electromagnetically driven valve characterized by further comprising fulcrum position changing means for changing the position of the fulcrum of the arm member in accordance with the engine operating state of the internal combustion engine. The electromagnetically driven valve according to any one of claims 1 to 11,
The electromagnetic actuator is configured to open and close a plurality of engine valves provided in the same cylinder via the arm member. The electromagnetically driven valve according to any one of claims 1 to 11,
The electromagnetic actuator is configured to open and close a plurality of engine valves provided between other cylinders via the arm member. The electromagnetically driven valve according to claim 12 or 13,
The electromagnetic actuator is configured to open and close the plurality of engine valves by rotating a plurality of arm members provided corresponding to the plurality of engine valves. The electromagnetically driven valve according to claim 12 or 13,
The plurality of engine valves are connected by a retainer,
The electromagnetically driven valve, wherein the arm member presses the retainer to drive the plurality of engine valves to open and close synchronously. In the electromagnetically driven valve according to any one of claims 1 to 15,
The engine-operated valve is characterized in that the planar shape of the umbrella portion is formed in a shape other than a circle. The electromagnetically driven valve according to claim 16,
The engine valve includes an anti-rotation mechanism that prevents the engine valve from rotating about a valve stem supported so as to be reciprocally movable. The electromagnetically driven valve according to any one of claims 1 to 17,
An electromagnetically driven valve characterized by commonly using an electromagnetic actuator used for opening / closing drive of an intake valve and an electromagnetic actuator used for opening / closing drive of an exhaust valve. The electromagnetically driven valve according to claim 18,
An electromagnetically driven valve characterized in that the number of intake valves that are opened and closed by one electromagnetic actuator is greater than the number of exhaust valves that are opened and closed by one electromagnetic actuator. The electromagnetically driven valve according to any one of claims 1 to 19,
The output member is supported so as to be swingable about a predetermined rotation axis.

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