JP2004285966A - Electromagnetically-driven valve system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetically-driven valve system capable of being mounted by reducing the height of the electromagnetically-driven valve system even if disposition intervals of intake and exhaust valves are small. <P>SOLUTION: This electromagnetically-driven valve system comprises: a movable element (40) reciprocatingly supported on a reference axis; an electromagnetic force generating mechanism (50) for reciprocating the movable element corresponding to energization; position holding mechanisms (60a, 60b) for maintaining the movable element at its neutral position at the time of nonenergization; and a positioning means (30) arranged so that the electromagnetic force generating mechanism and the position holding mechanisms may be overlapped at view points from the extension direction and the vertical direction of the reference axis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetically driven valve device and an internal combustion engine using the same.
[0002]
[Prior art]
Strict technical conditions are imposed on internal combustion engines, such as improved exhaust emissions, improved fuel efficiency, and improved operational stability. As one of the corresponding technologies, replacement of the opening and closing of an intake valve or an exhaust valve from a mechanical cam drive device to an electromagnetically driven valve device that can easily control opening and closing timing is being studied.
[0003]
For example, Japanese Patent Application Laid-Open No. 2000-303811 discloses an example in which an intake valve or an exhaust valve of a cylinder head is controlled by an electromagnetic valve driving device arranged on the cylinder head. Alternatively, it is provided with an armature (movable element) for driving an exhaust valve, first and second electromagnets for driving the armature vertically, and a biasing mechanism with a spring for keeping the armature at a predetermined position when the electromagnet is not excited.
[0004]
[Patent Document 1]
JP 2000-303811 A
[Problems to be solved by the invention]
However, in the electromagnetically driven valve device as described above, since the armature, the electromagnet, the spring, and the like are arranged in the axial direction of the intake or exhaust valve, the height of the electromagnetic valve drive device is higher than that of the cam drive device, and the internal combustion engine Height becomes high. With such a structure, it is difficult to clear the height restriction when the engine is mounted.
[0006]
Further, the electromagnetically driven valve device has a physique (width) in which an electromagnet is incorporated. If the arrangement interval between the intake and exhaust valves of each cylinder is small, the electromagnetically driven valve device cannot be mounted. For example, it is difficult to attach an electromagnetically driven valve device to an internal combustion engine in which intake and exhaust valves are arranged at a narrow included angle.
[0007]
Therefore, an object of the present invention is to provide an electromagnetically driven valve device that can reduce the height of the electromagnetically driven valve device and can be attached even when the arrangement interval between the intake and exhaust valves is narrow.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an electromagnetically driven valve device according to the present invention includes a movable element (armature) supported reciprocally on a reference axis, an electromagnetic force generating mechanism for reciprocating the movable element in response to energization, A position holding mechanism for holding the mover at the neutral position when not energized, and the electromagnetic force generating mechanism and the position holding mechanism are arranged so as to overlap in a viewpoint perpendicular to the direction in which the reference axis extends. Positioning means.
[0009]
With this configuration, the length (dimension) of the electromagnetically driven valve device in the reference axis direction can be reduced.
[0010]
Preferably, the positioning means is arranged such that the electromagnetic force generating mechanism and the position holding mechanism do not overlap in a viewpoint from the extending direction of the reference axis. Thereby, an electromagnetic force can be efficiently generated.
[0011]
Preferably, the positioning means arranges the electromagnetic force generating mechanism and the position holding mechanism in one direction separated from an extending direction of the reference axis. Thereby, it is easy to arrange the electromagnetically driven valve devices adjacent to each other, thereby avoiding deterioration in mountability.
[0012]
Preferably, the mover includes an armature stem that reciprocates on the reference axis, and an armature stem that is coupled to the armature stem and extends in one direction away from an extending direction of the reference axis. An armature plate receiving an electromagnetic force. Thereby, the electromagnetic force of the electromagnetic force generating mechanism can be received over a wide area, and the efficiency of using the electromagnetic force is improved.
[0013]
Preferably, the armature plate is guided in a reciprocating motion by a guide shaft provided in parallel with the reference axis. Thereby, rotation and inclination of the armature can be prevented.
[0014]
Preferably, the armature plate has a through hole through which the guide shaft passes. This makes it possible to reliably support the reciprocating motion of the armature.
[0015]
Preferably, the electromagnetic force generating mechanism and the guide shaft are arranged so as not to overlap in a viewpoint from the extending direction of the reference axis. Thereby, an electromagnetic force can be efficiently generated.
[0016]
Further, the internal combustion engine of the present invention uses the above-described electromagnetic valve driving device as a driving means of the intake valve or the exhaust valve. Thus, the height of the internal combustion engine can be suppressed from increasing, and the intake and exhaust valves can be appropriately arranged even at a narrow included angle.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
In the embodiment of the present invention, the armature accommodated in the housing is supported so as to reciprocate. A spring chamber is formed which accommodates a spring member formed in the housing in the axial direction of the armature and biasing the armature in the axial direction. Further, an electromagnet arranged to oppose the armature is housed in the housing. The valve body connected to the armature is opened and closed by electromagnetic force acting between the armature and the armature. The electromagnet and the spring chamber are disposed so as to overlap in the height direction.
[0019]
As described above, in the spring-mass-type electromagnetically driven valve actuator, the height of the actuator is reduced by disposing the opening / closing electromagnetic core with respect to the valve center. In addition, a configuration in which the physical size on the adjacent valve side is reduced by arranging the opening / closing electromagnetic core offset from the valve center. The core area is maximized by disposing the armature guide outside the electromagnetic core.
[0020]
FIG. 1A is a cross-sectional view illustrating a configuration of an electromagnetically driven valve device according to an embodiment of the present invention. FIG. 1B shows a cross section in the AA direction of FIG.
[0021]
As shown in FIG. 1, the valve driving device 1 includes a cylinder head 10, a valve 20, a housing 30, an armature 40 as a mover, an electromagnet 50 as an electromagnetic force generating mechanism, an upper spring portion 60a as a holding mechanism, and a lower spring. It is composed of a part 60b and the like.
[0022]
The valve 20 opens and closes the intake port 11 of the cylinder head 10 and introduces air or air-fuel mixture from the intake passage 12 into the combustion chamber. The stem 21 of the valve 20 is guided by the valve guide 13 and enters the lower spring chamber 14 of the lower spring portion 60b.
[0023]
The lower spring chamber 14 is provided with a spring seat 62 attached to the end of the valve stem 21 and a lower spring 61 disposed between the spring seat 62 and the bottom of the lower spring chamber 14. The valve 20 is urged by the lower spring 61 so as to close the intake port 11.
[0024]
An upper spring chamber 31 of the upper spring portion 60a is provided on an extension of the axis of the valve 20 of the housing 30. A spring seat 64 and an upper spring 63 disposed between the spring seat 64 and the ceiling of the upper spring chamber 31 are also provided in the upper spring chamber 31. The upper spring 63 biases the valve 20 in a direction to open the intake port 11.
[0025]
The stem 41 of the armature 40 is mounted between the spring seat 62 and the spring seat 64. The armature stem 41 is reciprocally supported by bearings 32 and 33 attached to the housing 30. The armature stem 41 and the valve stem 21 are connected via the spring seat 62. At substantially the center of the armature stem 41, an armature plate 42 extending to the left in FIG. The armature plate 42 is a ferromagnetic material such as iron or iron alloy. A through hole is formed at the other end of the armature plate 42, and a bearing 43 is provided. A guide shaft 44 arranged parallel to the central axis of the valve 20 passes through this bearing. Both ends of the guide shaft 44 are supported by the housing 30.
[0026]
An upper electromagnet 50a for closing the valve is disposed above the armature plate 42, and a lower electromagnet 50b for opening the valve is disposed below the armature plate 42. The upper electromagnet 50a includes an upper magnetic core 51 and an exciting winding 52. The lower electromagnet 50b is constituted by a lower magnetic core 53 and an exciting winding 54.
[0027]
FIG. 1B is a cross-sectional view in the AA direction of FIG. As shown by a two-dot chain line in the figure, the magnetic cores 51 and 53 have areas corresponding to the suction surfaces.
[0028]
In such a configuration, when the upper electromagnet 50a and the lower electromagnet 50b of the electromagnetically driven valve device 1 are not energized, the loads of the springs 61 and 63 are adjusted so that the armature 40 is located between the upper magnetic core 51 and the lower magnetic core 53. You. When the internal combustion engine is started, current is supplied to the upper electromagnet 50a and the lower electromagnet 50b alternately, and the armature plate 42 moves between the upper electromagnet 50a and the lower electromagnet 50b. Thereby, the armature 40 moves and the opening and closing of the valve 20 are repeated.
[0029]
FIG. 3 shows a comparative example. In the figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description of such parts is omitted.
[0030]
In this comparative example, since the armature 40, the electromagnet 50, the holding upper spring portion 60a, the lower spring portion 60b, and the like are stacked in the axial direction of the valve 20, the height of the device is H '.
[0031]
On the other hand, in the configuration of the embodiment in which the electromagnet 50 is arranged offset with respect to the axis center of the valve 20, as shown in FIG. 1A, the magnets of the electromagnets 50a and 50b are arranged with respect to the valve center axis a. The center axis b of the core is displaced to the left. Accordingly, the height of the device becomes H, and the height of the device of the solenoid valve driving device can be reduced by the overlap ΔH between the electromagnet 50 (or the electromagnet chamber) and the spring chambers 14 and 31 in the valve axis direction.
[0032]
Further, as shown in FIGS. 1B and 3B, in the configuration of the embodiment, the armature stem 41 does not exist in a portion of the armature plate 42 corresponding to the magnetic core attraction surfaces of the electromagnets 50a and 50b. . The effective area of the electromagnetic core can be maximized, and the suction force is not wasted.
[0033]
Further, in the configuration of the embodiment, the physique on the left side (one side) with respect to the axis of the valve is large, and the physique on the right side (the other side) is small. This is advantageous when the intake valve and the exhaust valve are arranged at a narrow included angle.
[0034]
FIG. 2 is an explanatory diagram for explaining an advantage of the electromagnetically driven valve device having such an asymmetric structure with respect to the valve shaft. In the figure, the same reference numerals are given to portions corresponding to FIG.
[0035]
As shown in FIG. 3A, when the included angle between the intake valve 20 and the exhaust valve 200 is large, even the electromagnetically driven valve device 1 of the comparative example can be mounted on the cylinder head 10. However, when the included angle between the intake valve 20 and the exhaust valve 200 is narrow as shown in FIG. 2B, the electromagnetically driven valve device 1 cannot be mounted because it overlaps.
[0036]
On the other hand, as shown in FIG. 7C, in the configuration of the embodiment, even when the included angle between the intake valve 20 and the exhaust valve 200 is narrow, the electromagnetically driven valve devices 1 do not overlap. Therefore, it can be mounted.
[0037]
In the embodiment, the center c of the guide stem 44 is arranged to be offset from the center b of the magnetic core, but may be arranged at the center b of the magnetic core to save the mounting space. Further, the electromagnet 50 may be a movable winding type or a linear motor type in which a winding side is provided on the armature plate 42 side. It is not limited to the configuration of the embodiment.
[0038]
【The invention's effect】
As described above, according to the present embodiment, the height of the electromagnetically driven valve device can be reduced, and the intake valve and the exhaust valve can be used in an internal combustion engine having an included angle arrangement.
[Brief description of the drawings]
FIG. 1 is a sectional view of an electromagnetically driven valve device for explaining an embodiment of the present invention.
FIG. 2 is an explanatory diagram illustrating advantages of the embodiment of the present invention.
FIG. 3 is a sectional view of a series drive type electromagnetic drive device for explaining a comparative example.
[Explanation of symbols]
10: Cylinder head, 20: Valve, 30: Housing, 40: Armature, 50: Electromagnet

Claims (8)

A mover supported so as to be able to reciprocate on a reference axis,
An electromagnetic force generating mechanism that reciprocates the mover according to energization,
A position holding mechanism that keeps the mover in the neutral position when not energized;
Positioning means for arranging the electromagnetic force generating mechanism and the position holding mechanism so as to overlap in a viewpoint perpendicular to the extending direction of the reference axis;
An electromagnetically driven valve device comprising: 2. The electromagnetically driven valve device according to claim 1, wherein the positioning unit is arranged so that the electromagnetic force generating mechanism and the position holding mechanism do not overlap with each other when viewed from a direction in which the reference axis extends. 3. 3. The electromagnetically driven valve device according to claim 1, wherein the positioning unit arranges the electromagnetic force generating mechanism and the position holding mechanism in one direction apart from an extending direction of the reference axis. 4. An armature stem that reciprocates on the reference axis; and an armature that is coupled to the armature stem and extends in one direction away from an extending direction of the reference axis. The solenoid valve driving device according to claim 1, further comprising a receiving armature plate. The electromagnetic driving device according to claim 4, wherein the armature plate is guided in a reciprocating motion by a guide shaft provided in parallel with the reference axis. The electromagnetic drive device according to claim 5, wherein the armature plate is provided with a through hole through which the guide shaft passes. 7. The electromagnetic drive device according to claim 5, wherein the electromagnetic force generating mechanism and the guide shaft are arranged so as not to overlap with each other in a view from the extending direction of the reference axis. An internal combustion engine using the electromagnetically driven valve device according to any one of claims 1 to 7 as driving means for an intake valve or an exhaust valve.

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