CN101006301A - Electromagnetically driven valve - Google Patents

Abstract

An electromagnetically driven valve includes a driven valve having a stem (12) and carrying out reciprocating motion along a direction in which the stem (12) extends, a disc support base (51), a lower disc (20) having one end coupled to the stem (12) and the other end supported by the disc support base (51) so as to allow free oscillation of the lower disc and oscillating around a central axis (25) extending at the other end, and a lower torsion bar (26) provided so as to extend along the central axis (25) and fixed to the other end. The lower torsion bar (26) has a fix portion (4) fixed to the disc support base (51), and a phase angle thereof around the central axis (25) with respect to the disc support base (51) can be adjusted. With such a structure, the driven valve can carry out reciprocating motion in a stable manner, and energy loss can be reduced.

Description

Solenoid driven valve

technical field

The present invention relates generally to solenoid-driven valves, and more particularly, to a rotary-driven solenoid-driven valve used in an internal combustion engine and driven by electromagnetic force and elastic force.

Background technique

Japanese Utility Model Laid-Open No. 61-200919 discloses a jack pin having serrations formed on the outer peripheral surface of the pin body along the axial direction thereof. Japanese Utility Model Laid-Open No. 61-200920 discloses a ejector pin having an elastic body provided on the outer peripheral surface of the pin body, the elastic body being pressed against and contacting the wall surface of the insertion hole.

Japanese Utility Model Publication No. 14-20004 discloses a device for preventing loosening of a male screw, which includes a male screw having a thread on the outer circumference and a notch on a part of the outer circumference, and a male screw arranged on the notch. Locknuts on the outer perimeter of the Furthermore, Japanese Utility Model Laid-Open No. 37-9013 discloses a loosening-preventing screw comprising a female screw shaped like a box, a screw screwed into the female screw, and a disc-shaped head. And in the axial direction from the head of the female threaded member to the inner end of the threaded member screwed into the set screw.

The so-called rotary-driven electromagnetically driven valve includes: a driven valve having a valve stem and performing reciprocating movement between a valve open position and a valve closed position, having an end adjacent to the end of the valve stem and hingedly driven by a disc. A platter is supported at the other end of the base support, and an electromagnet applies an electromagnetic force to the platter. The electromagnetically driven valve further includes a torsion bar provided at the other end of the disc and moving the driven valve toward the valve open position, and a coil spring arranged on the outer circumference of the valve stem and moving the driven valve toward the valve closed position . The elastic force of the spring and the electromagnetic force generated as a result of the current applied to the electromagnet cause the disc to oscillate about the other end. The movement of the disc is transmitted to the valve stem through the one end, so that the driven valve performs reciprocating movement.

In such an electromagnetically driven valve, the torsion bar and the coil spring are arranged so that the disk is located at a position intermediate between the valve open position and the valve closed position when no electromagnetic force is applied. Based on this assumption, the electromagnetic force for counteracting the elastic force of these springs at each lift position of the driven valve is calculated, and the current supply to the electromagnet is controlled according to the calculation result.

On the other hand, in torsion bars and coil springs, errors in shape or assembly with respect to the disc support base or valve stem that are inevitable in the manufacturing steps occur, which lead to setting the discs correctly to the middle location failure. In this case, an error occurs in the spring load applied to the driven valve at each lift position, and the correct electromagnetic force for canceling the spring load cannot be calculated. Then, the movement of the driven valve becomes unstable, the velocity of the valve when seated (sound generated by operation) is high, or the electric energy for correcting this error is wasted in the electromagnet.

Contents of the invention

In order to solve the above-mentioned problems, an object of the present invention is to provide an electromagnetically driven valve which realizes stable reciprocating movement of a driven valve and reduces energy loss.

The electromagnetically driven valve according to the present invention is actuated by cooperation of electromagnetic force and elastic force. The electromagnetically driven valve includes: a driven valve having a valve shaft and reciprocatingly moving along a direction in which the valve shaft extends; a support member provided at a position spaced from the driven valve; a swing member having coupled to one end of the valve shaft and the other end supported by the support member to allow free swing of the swing member, and swings around an axis extending at the other end; and a torsion spring disposed along The axis extends and is fixed to the other end. The torsion spring includes a fixed portion fixed to the support portion, and its phase angle with respect to the support portion around the axis is adjustable.

According to the electromagnetically driven valve constructed as above, the fixing portion is provided so that the torsion spring is attached to the support member in a state where the phase angle around the axis extending at the other end is adjustable, and is fixed to this position. Therefore, the spring load applied to the swing member by the torsion spring can be accurately set to a value determined at design time. Here, when the swing member actually swings, there is no error between the spring load applied to the swing member by the torsion spring and the spring load calculated at the time of design. Therefore, an electromagnetic force based on the designed spring load is applied to the swing member, thereby achieving stable reciprocating movement of the driven valve. Since there is no need to apply electromagnetic force for canceling errors in spring load, it is possible to prevent waste of electric power in the electromagnetically driven valve.

Preferably, a plurality of the swing members are provided with a distance from each other in a direction in which the valve shaft extends. According to the electromagnetically driven valve constructed as above, the above-described effects can be obtained in the electromagnetically driven valve employing the parallel link mechanism.

Preferably, the fixing portion includes an outer peripheral surface of the torsion spring formed with serrations. The support member has an opening for receiving the fixing portion. The inner wall of the opening is formed with serrations that engage with the serrations formed on the fixing portion. According to the electromagnetically driven valve constructed as above, the engagement between the saw teeth formed on the outer peripheral surface of the torsion spring and the saw teeth formed on the inner wall of the opening can be displaced, whereby the phase of the torsion spring relative to the support member around the axis can be adjusted horn. Furthermore, the torsion spring can also be securely fixed in the adjusted position due to the strong engagement between the teeth.

Preferably, the fixing portion comprises an outer peripheral surface of the torsion spring realized as a conical surface. The support member has an opening for receiving the fixing portion. The inner wall of the opening is formed with a tapered surface that presses against and contacts the tapered surface formed on the fixing portion. According to the electromagnetically driven valve constructed as above, the torsion spring can be pressed into the opening in a state where the tapered surface is slid, whereby the phase angle of the torsion spring with respect to the support member around the axis can be arbitrarily adjusted. Furthermore, since a wedging force is generated between the outer peripheral surface of the torsion spring and the inner wall of the opening, the torsion spring can be securely fixed in the adjusted position. Therefore, such a shape can be easily obtained even if the availability of torsion springs is poor.

Preferably, the fixing portion includes an outer peripheral surface of the torsion spring formed with a male thread. The support member has an opening for receiving the fixing portion. An inner wall of the opening is formed with a female thread so that the male thread formed on the fixing portion can be screwed into the female thread. A locknut is fastened to the opening at a side opposite to a direction in which the fixing portion is inserted. According to the electromagnetically driven valve constructed as above, the angle at which the torsion spring is screwed into the opening can be modified, whereby the phase angle of the torsion spring with respect to the support member around the axis can be arbitrarily adjusted. In addition, the torsion spring can be prevented from loosening by the repulsive force generated between the locknut and the torsion spring. Therefore, the torsion spring can be securely fixed in the adjusted position.

As described above, according to the present invention, it is possible to provide an electromagnetically driven valve in which the temperature reciprocation of the driven valve and the reduction in energy loss are obtained.

Description of drawings

FIG. 1 is a sectional view showing an electromagnetically driven valve according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating the electromagnet in FIG. 1 .

FIG. 3 is a perspective view showing a lower disc (upper disc) in FIG. 1 .

FIG. 4 is a perspective view of the electromagnetically driven valve taken along line IV-IV in FIG. 1 .

FIG. 5 is a perspective view of the electromagnetically driven valve taken along line V-V in FIG. 4 .

FIG. 6 is an end view of the lower torsion bar viewed in the direction of arrow VI in FIG. 5 .

Fig. 7 is a schematic diagram showing the upper disc and the lower disc at the swing end on the valve opening side.

Fig. 8 is a schematic diagram showing the upper disc and the lower disc at an intermediate position.

Fig. 9 is a schematic diagram showing the upper disc and the lower disc at the swing end on the valve closing side.

FIG. 10 is a graph showing the relationship between the lift amount of the driven valve and the resultant force of the upper torsion bar and the lower torsion bar.

11 is a sectional view showing an electromagnetically driven valve according to a second embodiment of the present invention.

FIG. 12 is a sectional view showing a modification of the electromagnetically driven valve in FIG. 11 .

Fig. 13 is a sectional view showing an electromagnetically driven valve according to a third embodiment of the present invention.

FIG. 14 is a cross-sectional view illustrating adjustment of load balance in the electromagnetically driven valve in FIG. 13 .

Detailed ways

Embodiments of the present invention will be described with reference to the drawings. Hereafter in the drawings, the same or corresponding elements are assigned the same reference numerals.

(first embodiment)

The electromagnetically driven valve according to the present embodiment is realized as an engine valve (intake valve or exhaust valve) in an internal combustion engine such as a gasoline engine or a diesel engine. In the present embodiment, description will be given assuming that the electromagnetically driven valve is implemented as an intake valve, however, it should be noted that the electromagnetically driven valve may be similarly configured when implemented as an exhaust valve.

Referring to FIG. 1 , the solenoid-driven valve 10 is a rotation-driven solenoid-driven valve. A parallel link mechanism is applied as an operating mechanism for electromagnetically driven valves.

The electromagnetically driven valve 10 includes a driven valve 14 having a valve stem 12 extending in one direction, a lower disc 20 coupled to different positions on the valve stem 12 and swinging by receiving electromagnetic force and elastic force applied thereto, and The upper disc 30, the disc support base 51 provided in parallel with the valve stem 12 at a position spaced from the valve stem 12, the valve opening/closing electromagnet 60 provided in the disc support base 51 and generating an electromagnetic force (hereinafter, Also simply referred to as an electromagnet 60 ), and an upper torsion bar 26 and a lower torsion bar 36 respectively disposed in the lower disc 20 and the upper disc 30 and applying elastic force to these discs. When receiving the swing motion of the lower disc 20 and the upper disc 30 , the driven valve 14 reciprocates in the direction in which the valve stem 12 extends (the direction indicated by the arrow 103 ).

The driven valve 14 is mounted on the cylinder head 41 in which the intake port 17 is formed. The valve seat 42 is provided at a position of the cylinder head 41 where the intake port 17 communicates with an unillustrated combustion chamber. The driven valve 14 also includes an umbrella portion 13 formed at the end of the valve stem 12 . The reciprocating movement of the driven valve 14 makes the umbrella portion 13 come into close contact with the valve seat 42 or move away from the valve seat 42 , thereby opening or closing the air inlet 17 . In other words, when the valve stem 12 is lifted, the driven valve 14 is positioned at the valve closed position. On the other hand, when the valve stem 12 is lowered, the driven valve 14 is positioned at the valve open position.

The valve stem 12 is composed of a lower valve stem 12m continuing from the umbrella portion 13 and an upper valve stem 12n connected to the lower valve stem 12m with a connecting regulator 16 interposed therebetween. The connection adjuster 16, which has the property of being easier to contract and harder to expand, fulfills a function as a cushioning member between the upper stem 12n and the lower stem 12m. The connection adjuster 16 accommodates the registration error of the driven valve 14 at the valve closed position and brings the umbrella portion 13 into contact with the valve seat 42 reliably. The lower stem 12m is formed with a coupling pin 12q protruding from its outer peripheral surface, and the upper stem 12n is formed with a coupling pin 12p protruding from its outer peripheral surface at a position apart from the coupling pin 12q.

In the cylinder head 41, a valve guide 43 for slidably guiding the lower valve rod 12m in the axial direction is provided, and a valve guide 43 for slidably guiding the lower valve rod 12m in the axial direction is provided at a position away from the valve guide 43. Valve guide 45 for upper valve stem 12n. The valve guide 43 and the valve guide 45 are formed of a metal material such as stainless steel to withstand high-speed sliding motion relative to the valve stem 12 .

Referring to FIGS. 1 and 2 , an electromagnet 60 is provided in the disk support base 51 at a position between the lower disk 20 and the upper disk 30 . The electromagnet 60 is composed of a valve opening/closing coil 62 and a valve opening/closing magnetic core 61 formed of a magnetic core material and having attracting surfaces 61a and 61b (hereinafter referred to as surface 61a, surface 61b ). The valve opening/closing core 61 has a shaft portion 61p extending in a direction perpendicular to the direction in which the valve stem 12 extends. The valve opening/closing coil 62 is provided in such a manner as to be wound around the shaft portion 61p, and is realized by a single coil (a coil realized by a continuous wire).

The disk supporting base 51 includes a valve opening permanent magnet 55 and a valve closing permanent magnet 56 on the side opposite to the valve opening permanent magnet 55 with the electromagnet 60 interposed therebetween. The valve opening permanent magnet 55 has an attracting surface 55 a (hereinafter referred to as surface 55 a ), and a space defined between the surface 55 a and the surface 61 b of the electromagnet 60 in which the lower disc 20 swings. In addition, the valve closing permanent magnet 56 has an attracting surface 56a (hereinafter referred to as surface 56a ), and a space defined between the surface 56a and the surface 61a of the electromagnet 60 in which the upper disc 30 swings.

Referring to FIGS. 1 and 3 , the lower disc 20 has one end 22 and the other end 23 and extends from the other end 23 to the one end 22 in a direction intersecting the valve stem 12 . The lower disc 20 is constituted by an arm portion 21 formed with rectangular surfaces 21a and 21b and extending between one end 22 and the other end 23, and a shaft accommodating portion 28 having a hollow cylindrical shape and disposed on 23 at the other end. Surfaces 21a and 21b face surface 61b of electromagnet 60 and surface 55a of valve opening permanent magnet 55, respectively.

The arm portion 21 has a notch 29 formed on the one end 22 side, and a slit hole 24 is formed in an opposite wall surface of the notch 29 . A central axis 25 extending in a direction perpendicular to a direction from one end 22 to the other end 23 is defined in the other end 23 . The shaft receiving portion 28 is formed with a through hole 27 extending along the central axis 25 .

The upper disc 30 is shaped similarly to the lower disc 20, and forms the one end 22, the other end 23, the arm portion 21, the surface 21a, the surface 21b, the notch 29, the elongated hole 24, the shaft accommodating portion and the lower disc 20. 28. One end 32, the other end 33, the arm portion 31, the surface 31b, the surface 31a, the notch 39, the elongated hole 34, the shaft receiving portion 38, the through hole 37, and the central axis corresponding to the through hole 27 and the central axis 25 respectively 35. The lower disc 20 and the upper disc 30 are formed of magnetic material.

One end 22 of the lower disc 20 is coupled to the lower stem 12m by inserting the coupling pin 12p into the elongated hole 24 to allow free swing of the disc. One end 32 of the upper disc 30 is coupled to the upper stem 12n by inserting the coupling pin 12q into the elongated hole 34 to allow free swing of the disc.

Hereinafter, the structure of the torsion bar 26 and the structure for attaching the lower disc 20 will be described. Note that the upper torsion bar 36 and the upper disc 30 also have similar structures.

Referring to FIG. 1 and FIGS. 4 to 6 , the lower torsion bar 26 is fixed at the other end 23 in a state where it is inserted into the through hole 27 . The lower torsion bar 26 is formed from spring steel and is shaped as a bar extending along the central axis 25 . The lower torsion bar 26 has at one end thereof a fixing portion 4 fixed to a disc support base 51 . On the side opposite to the fixed portion 4, a lower torsion bar 26 is rotatably supported by the disk support base.

The outer peripheral surface 4a of the fixing portion 4 is formed with serrations. The serrations are realized by slots extending in the axial direction and arranged side by side in the circumferential direction. The number of grooves arranged side by side in the circumferential direction on the outer shaft surface 4a can be set to, for example, 20, or alternatively, it can be set to other numbers. The disc support base 51 is formed with an opening 52 for receiving the fixing portion 4 . The inner wall of the opening 52 is formed with serrations which engage with the serrations formed on the outer peripheral surface 4a.

When the fixing portion 4 is inserted into the opening 52, the serrations formed on the outer peripheral surface 4a of the fixing portion 4 engage with the serrations formed on the inner wall of the opening 52, whereby the lower torsion bar 26 is fixed to the disc supporting base 51. . Then, the other end 23 of the lower disc 20 is supported by the disc support base 51 to allow free swing of the disc about the central axis 25 . Similarly, the other end 33 of the upper disc 30 is supported by the disc support base 51 with the upper torsion bar 36 interposed therebetween to allow free swing of the disc about the central axis 35 . Oscillation of the lower disc 20 and the upper disc 30 about the central axes 25 and 35 respectively may cause the driven valve 14 to reciprocate.

The lower torsion bar 26 applies elastic force to the lower disc 20 in such a manner that the lower disc 20 moves clockwise around the central axis 25 . The upper torsion bar 36 applies elastic force to the upper disc 30 in such a way that the upper disc 30 moves counterclockwise around the central axis 35 . When the electromagnetic force from the electromagnet 60 is not applied, the lower disc 20 and the upper disc 30 are positioned at the swing end on the valve opening side and the swing on the valve closing side by the elastic force of the lower torsion bar 26 and the upper torsion bar 36 midway between the ends.

In the present embodiment, the lower torsion bar 26 and the upper torsion bar 36 are fixed to the disc support base 51, and the positions where the saw teeth formed on the outer peripheral surface 4a of the fixed portion 4 engage with the saw teeth formed on the inner wall of the opening 52 can be changed. adjust. For example, if the lower disc 20 and the upper disc 30 are positioned closer to the swing ends on the valve opening side with respect to the above-mentioned intermediate position, the counterclockwise elastic force exerted by the upper torsion bar 36 counteracts the clockwise force produced by the lower torsion bar 26 . Hour hand elasticity. Here, for example, in order to increase the elastic force generated by the lower torsion bar 26 , the engagement position of the sawtooth should be adjusted such that the fixed portion 4 of the lower torsion bar 26 moves clockwise relative to the opening 52 . In this way, the fixed portion 4 is implemented as a mechanism for adjusting the load balance between the lower torsion bar 26 and the upper torsion bar 36 . By means of the fixing portion 4, the lower disc 20 and the upper disc 30 can be precisely positioned at an intermediate position between the swing end on the valve opening side and the swing end on the valve closing side.

The operation of the electromagnetically driven valve 10 will now be described.

Referring to FIG. 7 , when the slave valve 14 is in the valve open position, the valve opening/closing coil 62 is supplied with current flowing in a direction around the shaft portion 61p of the valve opening/closing core 61 as indicated by arrow 111 . Here, on the side where the upper disk 30 is located, the current flows from the back side of the paper sheet shown in FIG. 9 to the front side. Accordingly, magnetic flux flows in the valve opening/closing core 61 in the direction indicated by the arrow 112 , and generates an electromagnetic force that attracts the upper disc 30 toward the surface 61 a of the electromagnet 60 . On the other hand, the lower disc 20 is attracted toward the surface 55a by the valve opening permanent magnet 55 . Accordingly, the upper disc 30 and the lower disc 20 resist the elastic force of the lower torsion bar 26 arranged around the central axis 25 and are held at the swing ends on the valve opening side as shown in FIG. 7 .

Referring to FIG. 8, when the current supply to the valve opening/closing coil 62 is stopped, the electromagnetic force generated by the electromagnet 60 disappears. Then, as a result of the elastic force of the lower torsion bar 26, the upper disc 30 and the lower disc 20 move away from the surfaces 61a and 55a, respectively, and begin to swing toward the neutral position. The spring force exerted by the lower torsion bar 26 and the upper torsion bar 36 tends to hold the upper disc 30 and the lower disc 20 in the neutral position. Therefore, at a position beyond the intermediate position, a force in a direction opposite to the swing direction acts on the upper disc 30 and the lower disc 20 from the upper torsion bar 36 . On the other hand, since the inertial force acts on the upper disc 30 and the lower disc 20 in the swing direction, the upper disc 30 and the lower disc 20 will swing as long as their positions are beyond the middle position.

Referring to FIG. 9 , at a position beyond the intermediate position, current is again supplied to the valve opening/closing coil 62 in the direction shown by arrow 111 . Here, on the side where the lower disc 20 is located, the current flows from the front side to the back side of the paper sheet shown in FIG. 9 . Accordingly, magnetic flux flows in the valve opening/closing core 61 in the direction indicated by the arrow 132 , and generates an electromagnetic force that attracts the lower disc 20 toward the surface 61 b of the electromagnet 60 . On the other hand, the upper disc 30 is attracted by the valve closing permanent magnet 56 towards the surface 56a.

Here, the upper platter 30 is also attracted toward the surface 61 a of the electromagnet 60 by the electromagnetic force generated by the electromagnet 60 . At this time, the electromagnetic force between the lower plate 20 and the electromagnet 60 is stronger because the space therebetween is narrower. Accordingly, the upper disc 30 and the lower disc 20 swing from a position beyond the middle position to swing ends on the valve closing side as shown in FIG. 9 .

Thereafter, the current supply to the valve opening/closing coil 62 is repeatedly started and stopped at the above-mentioned timing. In this way, the upper disc 30 and the lower disc 20 are caused to swing between the swing ends on the valve opening side and the valve closing side, so that the driven valve 14 can reciprocate as a result of this swinging motion.

The electromagnetically driven valve 10 according to the first embodiment of the present invention is actuated by cooperation of electromagnetic force and elastic force. The electromagnetically driven valve 10 includes a driven valve 14, a disc support base 51, a lower disc 20 and an upper disc 50, and a lower torsion bar 26 and an upper torsion bar 36, and the driven valve 14 has a valve stem 12 serving as a valve shaft And move back and forth along the direction in which the valve rod 12 extends, the disc support base 51 is used as a support mechanism arranged at a position spaced from the driven valve 14, and the lower disc 20 and the upper disc 30 are used as a coupling with a coupling respectively. To one end 22 and 32 of the valve stem 12 and the other end 23 and 33 supported by the disc support base 51 to allow the free swing of the disc, and to swing around the central axis 25 and 35 extending at the other end 23 and 33 The swing member, the lower torsion bar 26 and the upper torsion bar 36 serve as torsion springs extending along the central axes 25 and 35 and fixed to the other ends 23 and 33 . The lower torsion bar 26 and the upper torsion bar 36 have the fixed portion 4 fixed to the disc support base 51, and their phase angles about the central axes 25 and 35 with respect to the disc support base 51 are adjustable.

The fixed portion 4 includes serrated outer peripheral surfaces 4 a of the lower torsion bar 26 and the upper torsion bar 36 . The disc support base 51 is formed with an opening 52 for receiving the fixing portion 4 . The inner wall of the opening 52 is formed with serrations that engage with serrations formed in the fixing portion 4 .

In the present embodiment, a mechanism for adjusting the load balance by the fixing portion 4 has been provided in each of the lower disc 20 and the upper disc 30, however, the mechanism may be provided in either of them. If a mechanism for adjusting the load balance is provided in each of the lower disc 20 and the upper disc 30, the load balance between the lower torsion bar 26 and the upper torsion bar 36 can be easily changed. Therefore, the elastic force applied to the lower disc 20 and the upper disc 30 during swinging can be freely adjusted.

According to the electromagnetically driven valve 10 in the first embodiment of the present invention configured as above, the fixed portion 4 is provided in the lower torsion bar 26 and the upper torsion bar 36, whereby the lower disc 20 and the upper The disk 30 can be precisely positioned at an intermediate position between the swing ends on the valve opening side and the valve closing side.

Figure 10 shows the relationship between the lift of the driven valve and the resultant force of the upper torsion bar and the lower torsion bar, and the direction in which the driven valve 14 is moved upwards is positive and the upper torsion bar 36 and the lower torsion bar The resultant force of 26 is shown on the vertical axis. The straight line 76 in FIG. 10 represents the relationship between the lift amount and the resultant force at the time of design, that is, when the electromagnetic force from the electromagnet 60 is not applied, the lower disc 20 and the upper disc 30 are precisely positioned at the middle position. the relationship between the two. The straight line 78 in FIG. 10 represents the relationship between the lift amount and the resultant force in the case where the lower disc 20 and the upper disc 30 are positioned closer to the valve opening side with respect to the neutral position, while the straight line 77 in FIG. 20 and the relationship between the lift amount and the resultant force in the case where the upper disc 30 is positioned closer to the valve closing side with respect to the neutral position.

As can be seen from a comparison of lines 76 to 78, if the lower disc 20 and upper disc 30 are set to a position offset from the neutral position, the point at which the elastic forces of the two torsion bars balance is changed from the designed The balance point P is shifted within the range indicated by the arrow 79 in FIG. 10 . Here, the resultant force applied by the two torsion bars to the driven valve 14 at each lifting position varies within the range indicated by the arrow 80 in FIG. The resultant force represented by 76 produces an error. However, in the present embodiment, the lower disc 20 and the upper disc 30 are positioned precisely at the middle position between the swing ends on the valve opening side and the valve closing side, so such an error does not occur. Accordingly, an electromagnetic force calculated based on a resultant force set at design time is applied to the lower disc 20 and the upper disc 30 , so that stable reciprocating movement of the driven valve 14 can be achieved.

(second embodiment)

The electromagnetically driven valve according to the present embodiment is constructed in a substantially similar manner to the electromagnetically driven valve 10 in the first embodiment. Therefore, descriptions of the same structures will not be repeated.

FIG. 11 shows an area similar to that shown in FIG. 5 . Referring to FIG. 11, in the present embodiment, the outer peripheral surface 4a of the fixing portion 4 is formed as a tapered surface. In other words, the outer peripheral surface 4 a extends obliquely with respect to the central axis 25 and is realized by the side surfaces of the truncated cone extending along the central axis 25 . On the inner wall of the opening 52 , there is formed a tapered surface that makes surface contact with the outer peripheral surface 4 a when the lower torsion bar 26 is inserted in the opening 52 . The fixing portion 4 is formed with a hexagonal hole from the end surface 4 c side of the fixing portion 4 .

The disk support base 51 is formed with a female threaded hole 81 which opens from the side surface 51 c side and continues to the opening 52 . The nut 82 is fastened into the female threaded hole 81 with a magnitude P of fastening force. The nut 82 is formed with a hexagonal hole 83 penetrating along the central axis 25 . The hexagonal hole 83 is larger than the hexagonal hole 84 . The nut 82 presses the end surface 4 c of the fixing portion 4 so that the tapered surface formed on the outer peripheral surface 4 a is pressed against and contacts the tapered surface formed on the inner wall of the opening 52 . Here, the angle between the central axis 25 and the edge line of the outer peripheral surface 4a is assumed to be θ (the taper angle of the outer peripheral surface 4a is 2θ). Accordingly, a fastening force N of the fixing portion 4 with a magnitude of P/tanθ is generated with respect to the opening 52 .

In this embodiment, a dedicated hexagonal wrench having a through hole formed in the axial direction as well as a conventional hexagonal wrench are used to fix the lower torsion bar 26 to the disc support base 51 . More specifically, the nut 82 is slightly tightened in a state where the fixing portion 4 is inserted into the opening 52 . Then, the tip of the special hexagonal wrench is fitted into the hexagonal hole 83 , and a conventional hexagonal wrench is inserted into a through hole formed in the special hexagonal wrench to fit into the hexagonal hole 84 . In this state, the lower torsion bar 26 is positioned to obtain the optimum phase angle by turning a conventional hexagonal wrench, and thereafter turning a special hexagonal wrench. Thus, the lower torsion bar 26 is fixed in this position.

According to the electromagnetically driven valve in the second embodiment of the present invention, the fixed portion 4 includes the outer peripheral surface 4a of the lower torsion bar 26 formed as a tapered surface. The disc support base 51 has an opening 52 for receiving the fixing portion 4 . The inner wall of the opening 52 is formed with a tapered surface that is pressed against and contacts the tapered surface formed on the fixing portion 4 .

The disc support base 51 is formed with a female screw hole 81 continuing to the opening 52 . A nut 82 (which serves as a pressing member that presses the end surface 4c of the fixing portion 4 and makes the tapered surfaces formed on the outer peripheral surface 4a and the inner wall of the opening 52 press and contact each other) is fastened to the female screw hole 81 . The fixing portion 4 is formed with a hexagonal hole 84 serving as a first tool insertion hole into which a hexagonal wrench serving as a tool for turning the fixing portion around the rotation axis 25 is inserted from the side of the end surface 4c . The nut 82 is formed with a hexagonal hole 83 serving as a second working insertion hole into which a dedicated hexagonal wrench for a tool exposing the hexagonal hole 84 to tighten the nut 82 is inserted.

FIG. 12 shows a variation of the electromagnetically driven valve in FIG. 11 . Referring to FIG. 12 , in this variation, a plate 71 connected to the end surface 4 c of the fixed portion 4 is provided instead of the nut 82 in FIG. 11 . The plate 71 is similar to a retaining ring and extends over the end surface 4c to the side surface 51c of the disc support base 51 . The plate 71 is formed with an elongated hole 71 h which is elongated in the axial direction about the central axis 25 at a position above the side surface 51 c. The plate 71 is fastened to the disk support base 51 by screws 72 inserted through the elongated holes 71h. In this variant, the bolts 72 are tightened with the plate 71 turned to fix the lower torsion bar 26 at the optimum phase angle.

In the present embodiment, only the contents related to the lower torsion bar 26 are described, however, the fixing portion 4 as described above may be provided only on at least one of the lower torsion bar 26 and the upper torsion bar 36 .

According to the electromagnetically driven valve in the second embodiment of the present invention constructed as above, effects similar to those of the first embodiment can be obtained. Furthermore, according to the present embodiment, the mechanism for adjusting the load balance by the fixed portion 4 is realized by the abutment of the conical surfaces. Therefore, the lower torsion bar 26 can be positioned at any phase angle around the central axis 25, so that adjustment of load balance with a higher degree of freedom can be realized. Furthermore, since a large fastening force can be generated by the effect of the wrench, loosening of the lower torsion bar 26 can be prevented.

(third embodiment)

The electromagnetically driven valve according to the present embodiment is constructed in a substantially similar manner to the electromagnetically driven valve 10 in the first embodiment. Therefore, descriptions of the same structures will not be repeated.

FIG. 13 shows an area similar to that shown in FIG. 5 . Referring to FIG. 13, in the present embodiment, the outer peripheral surface 4a of the fixing portion 4 is formed with male threads. The fixing portion is formed with a hexagonal hole 88 from the end surface side 4 c of the fixing portion 4 . On the other hand, the inner wall of the opening 52 is formed with female threads into which the male threads formed on the outer peripheral surface 4a can be screwed. A locknut 86 is fastened to the opening 52 from the side opposite to the fixed portion 4, and presses the end surface 4c of the fixed portion 4 by an end surface 86c of the locknut 86 facing the end surface 4c. The locknut 86 is formed with a hole 87 penetrating in the direction in which the central axis 25 extends.

The procedure for adjusting the load balance in the electromagnetically driven valve shown in FIG. 13 will now be described. Referring to FIG. 14 , the fixing portion 4 is first fastened to the opening 52 . Referring to FIG. 13 , slightly tighten locknut 86 from the opposite side and fit a hex wrench through hole 87 into hex hole 88 . In this state, the lower torsion bar 26 is positioned at the optimal phase angle by turning the hexagonal wrench, and the locknut 86 is further tightened strongly. Thus, the lower torsion bar 26 is fixed in this position.

According to the electromagnetically driven valve in the third embodiment of the present invention, the fixed portion 4 includes the outer peripheral surface 4 a of the lower torsion bar 26 formed with male threads. The disc support base 51 has an opening 52 for receiving the fixing portion 4 . The inner wall of the opening 52 is formed with female threads so that the male threads formed on the fixing portion 4 can be screwed into. The locknut 86 is fastened to the opening 52 in a direction opposite to the direction in which the fixing portion 4 is inserted.

The fixed portion 4 is formed from the side of the end surface 4 c with a hexagonal hole 88 serving as a tool insertion hole into which a tool for rotating the fixed portion 4 about the rotation axis 25 is inserted. The locknut 86 is formed with a hole 87 for exposing a hexagonal hole 88 .

In the present embodiment, only the contents related to the lower torsion bar 26 are described, however, the fixing portion 4 as described above may be provided only on at least one of the lower torsion bar 26 and the upper torsion bar 36 .

According to the electromagnetically driven valve in the third embodiment of the present invention constructed as above, effects similar to those of the first embodiment can be obtained. Furthermore, according to the present embodiment, the mechanism for adjusting the load balance by the fixing portion 4 is realized by a screw structure. Therefore, the lower torsion bar 26 can be positioned at any phase angle around the central axis 25, so that adjustment of load balance with a higher degree of freedom can be realized.

The first to third embodiments have described examples in which a parallel link mechanism is employed in a rotationally driven electromagnetically driven valve, however, the present invention is not limited thereto. The present invention can be applied to an electromagnetically driven valve as follows in a similar manner to the first to third embodiments, which includes a disc having one end coupled to the valve stem 12 and a plurality of electromagnets. At the other end supported by the sheet support base 51 to allow free swing of the disk, a plurality of electromagnets are arranged above and below the disk and alternately apply electromagnetic force to the disk.

While the present invention has been described and illustrated in detail, it should be clearly understood that this has been done by way of illustration and example only and not in a limiting sense, the spirit and scope of the invention being limited only by the terms of the appended claims.

Industrial applicability

The present invention is mainly used as an intake valve or an exhaust valve in a gasoline engine, a diesel engine, and the like.

Claims (5)

1. Electromagnetically driven valve, it activated by the collaborative of electromagnetic force and elastic force, comprising:

Servo valve (14), it has valve shaft (12) and moves back and forth along the direction that described valve shaft (12) extends;

Supporting member (51), it is arranged on and described servo valve (14) spaced positions place;

Swinging member (20,30), it has the end (22,32) that is coupled to described valve shaft (12) and supports the other end that freely swings (23,33) to allow described swinging member by described supporting member (51), and be that swing at the center with the axis of locating to extend at the described the other end (23,33) (25,35); With

Torque spring (26,36), it is set to extend and be fixed to the described the other end (23,33) along described axis (25,35); Wherein

Described torque spring (26,36) comprises the standing part (4) that is fixed to described supporting member (51), and can regulate described standing part relatively with the phase angle of described supporting member (51) around described axis (25,35).

2. Electromagnetically driven valve according to claim 1, wherein

State with each interval on the direction of extending at described valve shaft (12) is provided with a plurality of described swinging members (20,30).

3. Electromagnetically driven valve according to claim 1, wherein

Described standing part (4) comprises the serrate outer surface of formation (4a) of described torque spring (26,36),

Described supporting member (51) has the opening (52) that is used to take in described standing part (4), and

The inwall of described opening (52) is formed with and the sawtooth that is formed on the described engagement on the described standing part (4).

4. Electromagnetically driven valve according to claim 1, wherein

Described standing part (4) comprises the outer surface that is embodied as conical surface (4a) of described torque spring (26,36),

Described supporting member (51) has the opening (52) that is used to take in described standing part (4), and

The inwall of described opening (52) is formed with and presses and contact the conical surface that is formed on the described conical surface on the described standing part (4).

5. Electromagnetically driven valve according to claim 1, wherein

Described standing part (4) comprises the outer surface that is formed with external screw thread (4a) of described torque spring (26,36),

Described supporting member (51) has the opening (52) that is used to take in described standing part (4), and

The inwall of described opening (52) is formed with female thread, make the described external screw thread that is formed on the described standing part (4) can be screwed into described female thread, and lock nut (86) is fastened to described opening (52) from a side relative with the direction of described standing part (4) insertion.

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