Solenoid device

Abstract

Solenoid device (1) with: an electromagnetic coil (2) through which an electric current is passed to generate a magnetic flux (φ); a fixed core (3) which is arranged in the electromagnetic coil (2); a movable core (4) which performs a reciprocating movement in an axial direction of the electromagnetic coil (2) depending on whether an electric current passes through the electromagnetic coil (2); a magnetic spring (5) arranged between the fixed core (3) and the movable core (4) and comprising a magnetic substance, wherein the magnetic spring (5) biases the movable core (4) in a direction away from the fixed core (3) in the axial direction; and a yoke (6) which is included in a magnetic circuit (C) in which the magnetic flux (φ) flows, wherein the magnetic circuit (C) further comprises the magnetic spring (5), the movable core (4) and the fixed core (3), wherein When an electric current passes through the electromagnetic coil (2), the movable core (4) is attracted to an access position by an electromagnetic force against a spring force of the magnetic spring (5), the access position being relatively close to the fixed core (3), the electromagnetic force arising from the conduction of the electric current; and when the conduction of the electric current through the electromagnetic coil (2) is stopped, the movable core (4) is moved to a separation position by the spring force of the magnetic spring (5), the separation position being farther from the fixed core (3) than the access position. the magnetic spring (5) comprises a leaf spring element (50) which has the magnetic substance and is wound in such a spiral manner that a thickness direction of the leaf spring element (50) coincides with a radial direction of the electromagnetic coil (2), wherein a central section (51) of the magnetic spring (5) is biased to one side in the axial direction compared to a circumferential section (52) of the magnetic spring (5), and When the movable core (4) is attracted to the access position, the magnetic spring (5) is prevented from extending to a minimum spring length (L). MIN ) is deformed, which corresponds to a width of the leaf spring element (50) in the axial direction.

Description

Cross-reference to related registration

[0001] The present application is based on the Japanese patent application No. JP 2017 - 216 193 A filed on November 9, 2017, the contents of which are hereby incorporated by reference. Technical field

[0002] The present invention relates to a solenoid device comprising an electromagnetic coil and a movable core for performing a reciprocating movement depending on whether an electric current passes through the electromagnetic coil. Background of the state of the art

[0003] In the prior art, a solenoid device is known that has an electromagnetic coil and a movable core which performs a reciprocating motion depending on whether an electric current flows through the electromagnetic coil (see patent document 1 cited below). In the solenoid device, the electromagnetic coil is provided internally with a fixed core containing a magnetic substance. A spring element is also provided between the fixed core and the movable core. The spring element pushes the movable core away from the fixed core along an axial direction of the electromagnetic coil.

[0004] When an electric current flows through the electromagnetic coil, a magnetic flux is generated, producing an electromagnetic force that attracts the movable core to the fixed core against the compressive force of the spring element. Furthermore, when the flow of electric current through the electromagnetic coil is stopped, the electromagnetic force is eliminated, and the compressive force of the spring element separates the movable core from the fixed core. The solenoid device thus causes the movable core to perform a reciprocating motion, depending on whether an electric current flows through the electromagnetic coil.

[0005] The spring element is made of a non-magnetic material. Therefore, the section of the solenoid device in which the spring element is located offers high magnetic resistance, and the moving core is not attracted by a sufficiently strong force unless a high current passes through the electromagnetic coil.

[0006] To solve this problem, investigations have recently been carried out concerning the formation of a spring element using a magnetic substance. In particular, investigations have been carried out with regard to the application of a spring element (hereinafter referred to as a magnetic spring: see below). Fig. 4) which is formed by a spiral winding of a leaf spring made of a magnetic substance, wherein the spring element is shaped such that, when no force is applied in an axial direction, a central section of the spring element is biased to one side in an axial direction compared to a circumferential section of the spring element. The application of such a magnetic spring enables a reduction of the magnetic resistance at the section containing the magnetic spring (i.e., the section between the fixed core and the movable core). It is thus expected that a magnetic flux will flow more easily through the electromagnetic coil and that the movable core will be attracted by a strong force even with a small amount of electric current passing through the electromagnetic coil. List of state-of-the-art patent documents Patent document 1: JP 2015 - 162 537 A Patent document 2: WO 2018 / 084 222 A1 Patent document 3: DE 10 2018 104 456 A1 Patent Document 4: US 8,451,079 B2

[0007] WO 2018 / 084 222 A1 discloses a magnetic switching element in which a solid core is arranged within a coil center hole section in an inner diameter section of an excitation coil and forms a magnetic circuit. A yoke covers the outer circumferential side of the excitation coil and the end section sides of the excitation coil in their axial direction, forming a magnetic circuit and having an open section on one side in its axial direction. A movable core faces the solid core and is pulled in the direction of the solid core when the excitation coil is energized. A return spring biases the movable core in the opposite direction to the direction of pull. When the excitation coil is not energized, a first gap forms between the solid core and the movable core. A second gap forms between the yoke and the movable core when the excitation coil is not energized.

[0008] DE 10 2018 104 456 A1 discloses an electromagnetic relay device with an excitation coil having opposite first and second ends in an associated axial direction and configured to generate a magnetic flux as soon as it is energized; a stationary core arranged coaxially in the excitation coil forming a magnetic circuit; a yoke arranged to surround an outer circumference of the excitation coil and the second end of the excitation coil to form the magnetic circuit, the yoke having an opening arranged to be closer to the first end of the excitation coil than to the second end of the excitation coil and opposite the stationary core;a movable core arranged to face the stationary core across the opening, the movable core being configured to be drawn towards the stationary core as soon as the excitation coil is energized; and a return spring made of a magnetic element wound helically in an axial direction of the stationary core, the return spring forming the magnetic circuit and being configured to push the movable core so that it is separated from the stationary core.

[0009] US 8,451,079 B2 discloses an electromagnetic solenoid comprising: an electromagnetic coil which forms an electromagnet when electrical power is supplied; a stationary iron core which is arranged at an end portion of the electromagnetic coil and which becomes magnetized when electrical power is supplied to the electromagnetic coil; a movable iron core which is configured to move towards and away from the stationary iron core along the axial direction into the interior of the electromagnetic coil; and a spring coil which is arranged between the stationary iron core and the movable iron core and which exerts a spring force on the movable iron core in a direction opposite to that of the stationary iron core along the axial direction, wherein a magnetic attraction surface and a mating element are formed in at least the stationary iron core and / or the movable iron core.wherein the magnetic attraction surface comes into contact with the other iron core when the movable iron core is attracted to and touched by the stationary iron core, and an outer circumferential surface of the fitting part, which is spaced from the magnetic attraction surface by a predetermined distance in the direction opposite to the stationary iron core along the axial direction, engages with the spring coil, and the outermost circumferential part of the magnetic attraction surface is positioned inwards in the diameter direction in contrast to the outermost circumferential part of the fitting part. Summary of the invention

[0010] The solenoid device described above in JP 2015-162537A introduces a difference in the attracting force between individual solenoid devices. Specifically, in the solenoid device described above, when the movable core is attracted, the magnetic spring is deformed to the width of the leaf spring described above (in other words, to the minimum spring length of the magnetic spring). When an axial force is applied to the magnetic spring, which has a natural length, the spring length gradually decreases while the spring force gradually increases (see Figure 1). Fig. 6) If the magnetic spring is sufficiently longer than the minimum spring length, the amount of offset from the natural length (actual length) and the spring force are in an essentially proportional relationship. However, near the minimum spring length, the spring force increases suddenly (rapidly). Furthermore, near the minimum spring length, the spring force varies among the products. Additionally, the deformation of the magnetic spring to the minimum spring length leads to a significant variation in the spring force among the products, and thus the attracting force (i.e., the force obtained by subtracting the spring force of the magnetic spring from the electromagnetic force resulting from conducting the electric current through the electromagnetic coil) of the movable core is likely to vary.Thus, the attraction may be insufficient, preventing the movable core from being attracted, or causing the speed at which the movable core is attracted to vary significantly.

[0011] One object of the present invention is to create a solenoid device that can reduce fluctuations in the pulling force of the movable core among the products.

[0012] This problem is solved by a solenoid device with the features of claim 1. Advantageous embodiments are shown in the dependent claims.

[0013] The solenoid device is designed in such a way that when the movable core is attracted to the access position, it prevents the magnetic spring from deforming to the minimum spring length.

[0014] This eliminates the need for a range (near the minimum spring length) of the magnetic spring that introduces a variation in spring force between products, thus suppressing the variation in the attracting force of the moving core (i.e., the force obtained by subtracting the spring force of the magnetic spring from the electromagnetic force resulting from conducting electric current through the electromagnetic coil). Accordingly, the solenoid device prevents failures in attracting the magnetic core due to insufficient attracting force and also suppresses significant variation in the attracting speed of the moving core.

[0015] As described above, according to the aspect explained above, a solenoid device can be created which can reduce variation (fluctuation) in the magnetic core's attracting force among the products. Brief description of the drawings

[0016] The above-described problem and further objectives, features and advantages of the present invention will become clearer from the following detailed description in conjunction with the accompanying drawings. Fig. Figure 1 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a first embodiment. Fig. Figure 2 shows a cross-sectional view of the solenoid device immediately after electric current passes through the electromagnetic coil, according to the first embodiment. Fig. Figure 3 shows a cross-sectional view of a solenoid device in a state in which electric current passes through an electromagnetic coil, according to the first embodiment. Fig. Figure 4 shows a perspective view of a magnetic spring on which no force is applied, according to the first embodiment. Fig. Figure 5 shows a perspective view of the magnetic spring upon which a force is applied in an axial direction. Fig. Figure 6 shows a graphical representation of a relationship between the spring length and the spring force of the magnetic spring according to the first embodiment. Fig. Figure 7 shows a perspective view of the solenoid device of the first embodiment. Fig. Figure 8 shows a representation of the operating processes of a relay system using the solenoid device of the first embodiment. Fig. 9 shows a Fig. 8. The following illustration. Fig. 10 shows a Fig. 9. The following illustration. Fig. 11 shows a Fig. 10. The following illustration. Fig. Figure 12 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a second embodiment. Fig. Figure 13 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through the electromagnetic coil, according to the second embodiment. Fig. Figure 14 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a third embodiment. Fig. Figure 15 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through the electromagnetic coil, according to the third embodiment. Fig. Figure 16 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a fourth embodiment. Fig. Figure 17 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through the electromagnetic coil, according to the fourth embodiment. Fig. Figure 18 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a fifth embodiment. Fig. Figure 19 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through the electromagnetic coil, according to the fifth embodiment. Fig. Figure 20 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a sixth embodiment. Fig. Figure 21 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through an electromagnetic coil, according to the sixth embodiment. Fig. Figure 22 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a seventh embodiment. Fig. Figure 23 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through an electromagnetic coil, according to the seventh embodiment. Fig. Figure 24 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in an eighth embodiment. Fig. Figure 25 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through an electromagnetic coil, according to the eighth embodiment. Fig. Figure 26 shows a cross-sectional view of a solenoid device in a state in which no electric current passes through an electromagnetic coil, in a ninth embodiment. Fig. Figure 27 shows a cross-sectional view of the solenoid device in a state in which an electric current passes through an electromagnetic coil, according to the ninth embodiment. Description of the exemplary embodiments: First exemplary embodiment

[0017] The following are exemplary embodiments relating to the solenoid device described above, with reference to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 described. As this is described in the Fig. 1, Fig. 2 to Fig. As shown in Figure 3, a solenoid device 1 according to the present embodiment has an electromagnetic coil 2 through which an electric current (electric current intensity) is passed to generate a magnetic flux φ, a fixed core 3, a movable core 4, a magnetic spring 5, and a yoke 6. The fixed core 3 is arranged in the electromagnetic coil 2. The movable core 4 performs a reciprocating movement in an axial direction (direction Z) of the electromagnetic coil 2, depending on whether an electric current passes through the electromagnetic coil 2.

[0018] The magnetic spring 5 is arranged between the fixed core 3 and the movable core 4. The magnetic spring 5 contains a magnetic substance and biases the movable core 4 in a direction away from the fixed core 3 in a direction Z. The yoke, together with the magnetic spring 5, the movable core 4, and the fixed core 3, forms a magnetic circuit C through which a magnetic flux φ flows.

[0019] If, as in Fig. As shown in Figure 3, when an electric current passes through the electromagnetic coil 2, the movable core 4 is attracted to an access position by an electromagnetic force against a spring force of the magnetic spring 5, the access position being relatively close to the fixed core 3, the electromagnetic force arising from the conduction of the electric current. Furthermore, as shown in Figure 3, the magnetic force is attracted to the moving core 4 by an electromagnetic force acting against the magnetic force of the magnetic spring 5. Fig. Figure 1 shows that when the supply of electric current through the electromagnetic coil 2 is stopped, the movable core 4 is moved to a separation position by the spring force of the magnetic spring 5, the separation position being further away from the fixed core 3 than the access position.

[0020] As this is shown in the Fig. 1 and Fig. As shown in Figure 5, the magnetic spring 5 is formed by a spiral winding (winding) of a leaf spring element 50 which has a magnetic substance, in such a way that a thickness direction of the leaf spring element 50 coincides with a radial direction of the electromagnetic coil 2, and a central section 51 of the magnetic spring 5 is arranged such that it is biased to one side in a direction Z compared to a circumferential section 52 of the magnetic spring 5.

[0021] If, as in Fig. As shown in Figure 3, when the movable core 4 is attracted to the access position, the magnetic spring 5 is prevented from settling to a minimum spring length L. MIN deformed, which corresponds to the width of the leaf spring element 50.

[0022] The solenoid device 1 of the present embodiment is used in an electromagnetic relay 10. As shown in Fig. As shown in Figure 1, the electromagnetic relay 10 has a switch 16 (16 a and 16 b ). Forward and backward movements of the movable core 4 switch the switch 16 on and off.

[0023] As this is in Fig. As shown in Figure 1, the solenoid device 1 has a shaft 7 that is inserted into the fixed core 3. The shaft 7 is made of a non-magnetic material. An end piece 71 of the shaft 7 is made of an insulating material.

[0024] As this is shown in the Fig. 1 and Fig. As shown in Figure 7, the yoke 6 has a bottom wall section 63, a side wall section 62, and an upper wall section 61. The upper wall section 61 is provided with a through-hole 610. The movable core 4 is inserted (fitted) into the through-hole 610. ... Fig. As shown in Figure 3, an inner surface of the through-hole 610 is provided with a stopper or stop 611 which holds the movable core 4 at the access position.

[0025] As this is in Fig. As shown in Figure 1, the electromagnetic relay 10 has a fixed conductive unit 13, a movable conductive unit 12, a fixed-side contact 15 formed on the fixed conductive unit 13, and a movable-side contact 14 formed on the movable conductive unit 12. The conductive units 12 and 13 and the contacts 14 and 15 are located in the switch 16 (16 a and 16 b) comprises. A switch-side spring element 17 is provided between the movable conductive unit 12 and a wall section 111 of a housing 11. The switch-side spring element 17 is used to press the movable conductive unit 12 towards the fixed core 3 in the direction Z.

[0026] As this is in Fig. As shown in Figure 1, when the conduction of electric current through the electromagnetic coil 2 is stopped, the movable core 4 is pushed by the spring force of the magnetic spring 5 to the separation position. At this point, the end piece 71 of the shaft 7 comes into contact with the movable conductive unit 12, pushing the movable conductive unit 12 against a pressing force from the switch-side spring element 17. Thus, contacts 14 and 15 separate from each other, turning off the switch 16.

[0027] Furthermore, as is shown in Fig. As shown in Figure 2, when the conduction of electric current through the electromagnetic coil 2 begins, a magnetic flux φ is generated. The magnetic flux φ flows from the fixed core 3 to the magnetic spring 5 and then through the movable core 4, a gap G, and the yoke 6. A portion of the magnetic flux φ also flows through a space S between the fixed core 3 and the magnetic spring 5. Similarly, the magnetic flux φ flows through a space between the movable core 4 and the magnetic spring 5. The magnetic flux φ flows, as described above, to generate an electromagnetic force, attracting the movable core 4 against the compressive force of the magnetic spring 5, as shown in Figure 2. Fig. Figure 3 shows that the movable core 4 comes into contact with the stopper 611 (stop) and is stopped.

[0028] When the movable core 4 is tightened as described above, the shaft 7 is also tightened towards the fixed core 3. Thus, the pressing force of the switch-side spring element 17 pushes the movable conductive unit 12 towards the fixed core 3, thereby opening the switch 16 (16 a , 16 b ) is switched on.

[0029] The following describes a relationship between the length and the spring force of the magnetic spring 5. As this is shown in Fig. As shown in Figure 6, when a force in direction Z is applied to the magnetic spring 5, which has a natural length (intrinsic length), the spring length gradually increases to increase the spring force. In a case where the magnetic spring 5 is sufficiently longer than a minimum spring length L MIN The amount of offset from the natural length (actual length) and the spring force are in an essentially proportional relationship. However, this relationship decreases as the spring length approaches its minimum length L.MIN The spring force increases suddenly (quickly, abruptly). Furthermore, the spring force increases near the minimum spring length L. MIN This can result in significant manufacturing variations. Therefore, in a case where the magnetic spring 5 is reduced to the minimum spring length L MIN is deformed when the movable core 4 (see below) Fig. 3) is attracted, the significant manufacturing variation in spring force prevents the movable core 4 from being sufficiently attracted, or can reduce the speed at which the movable core 4 is attracted. However, in the present embodiment, the magnetic spring 5 is not set to the minimum spring length L. MIN deformed (see above). Fig. 3), which makes it less likely that the effects of fluctuation in spring force described above will be generated. Thus, the movable core 4 can be reliably attracted to the access position. In addition, fluctuations in the speed at which the movable core 4 is attracted can be suppressed. Furthermore, in the present embodiment, only the area of ​​the magnetic spring 5 can be used where the offset amount and the spring force are essentially proportional (see Figure 3). Fig. 6), which thus facilitates the design of the magnetic spring 5.

[0030] The following describes a procedure for an application of the electromagnetic relay 10. As this is shown in Fig. As shown in Figure 8, in the present embodiment a relay system 19 is constructed using the electromagnetic relay 10. The relay system 19 has three electromagnetic relays 10, a DC power supply 72, a smoothing capacitor 75, an electrical system 73, a pre-charging resistor 76, and a control unit 74. The control unit 74 controls the switching on / off operations of the individual electromagnetic relays 10.

[0031] An electromagnetic relay 10 P The positive side is connected to a wiring 77 on the positive side, which connects a positive electrode 721 of the DC power supply 72 and the electrical system 73. An electromagnetic relay 10 is also provided. NThe negative side is provided on a wiring connection 78, which connects a negative electrode 722 of the DC power supply 72 and the electrical system 73. In addition, an electromagnetic relay 10 is provided. C Provided for pre-charging in series with the pre-charging resistor 76.

[0032] If both the electromagnetic relay 10 P the positive side as well as the electromagnetic relay 10 N If the negative side is switched on when the smoothing capacitor 75 is not charged, an inrush current can flow through the smoothing capacitor 75, leading to the melting of the switch 16. Thus, as shown in Fig. Figure 9 shows the electromagnetic relay 10 C for pre-charging and the electromagnetic relay 10 N the negative side is switched on so that a current I gradually passes through the pre-charging resistor 76.

[0033] As this is in Fig. As shown in Figure 10, after the smoothing capacitor 75 has been charged to prevent the flow of inrush current, the electromagnetic relay 10 P the positive side is switched on. Subsequently, as described in Fig. Figure 11 shows the electromagnetic relay 10 C The system is switched off for pre-charging. Then the electric current I flows continuously through the electrical system 73 via the electromagnetic relay 10. P the positive side and the electromagnetic relay 10 N the negative side.

[0034] The functions and effects of the present embodiment are described below. As this is shown in Fig. As shown in Figure 3, in the present embodiment, when the movable core 4 is pulled into the access position, the magnetic spring 5 is prevented from extending to the minimum spring length L. MIN is deformed.

[0035] Thus, the present embodiment eliminates the need for an application of the area of ​​the magnetic spring 5 (near the minimum spring length L). MIN : sh. Fig. 6), in which the spring force of the magnetic spring 5 varies significantly among the products. This, in turn, prevents an error in the attraction of the movable core 4 resulting from an insufficient attracting force of the movable core 4 (i.e., the force obtained by subtracting the spring force of the magnetic spring 5 from an electromagnetic force resulting from the conduction of electric current through the electromagnetic coil 2), and also prevents a significant variation in the attracting speed of the movable core 4.

[0036] Furthermore, the structure described above allows the application of only the area (see above). Fig. 6) of the magnetic spring 5, in which the offset from the natural length and the spring force are in a substantially proportional relationship. This range results in a slight (non-significant) variation among the products, which thus simplifies the design of the magnetic spring 5. In other words, the magnetic spring 5 must fulfill both magnetic and mechanical properties (spring force), and therefore a significant variation in the spring force makes the design difficult. However, in the present embodiment, the use of only the range with the slight (non-significant) variation in spring force among the products is permitted, which simplifies the design of the magnetic spring 5.

[0037] Furthermore, as this is shown in Fig. As shown in Figure 1, the magnetic spring 5 of the present embodiment is designed in such a way that the leaf spring element 50, which comprises a magnetic substance, is wound in a spiral such that the thickness direction of the leaf spring element 50 coincides with the radial direction of the electromagnetic coil 2, and the central section 51 of the magnetic spring 5 is arranged such that it is biased to one side in the direction Z compared to the circumferential section 52 of the magnetic spring 5.

[0038] The application of the magnetic spring 5 with the structure described above facilitates an increase in the cross-sectional area of ​​the magnetic spring 5. This allows a higher amount of magnetic flux φ to pass through the magnetic spring 5, which in turn increases the attracting force of the movable core 4. This also facilitates an increase in the contact area between the magnetic spring 5 and the fixed core 3, as well as an increase in the contact area between the magnetic spring 5 and the movable core 4. Thus, the amount of magnetic flux φ flowing through the spring can be increased, and the attracting force of the movable core 4 can be increased.Furthermore, the application of the magnetic spring 5 with the above-described structure allows for a gradual increase in the contact area (contact surface) between the magnetic spring 5 and the fixed core 3, and in the contact area (contact surface) between the magnetic spring 5 and the movable core 4, while maintaining the attraction of the movable core 4. Accordingly, even in a case where the movable core 4 approaches the fixed core 3 and the spring force of the magnetic spring 5 increases, the magnitude of the magnetic flux φ increases, which allows for an increase in the electromagnetic force of the electromagnetic coil 2, thus permitting the movable core 4 to be attracted by a strong force.

[0039] As described above, according to the present embodiment, a solenoid device can be provided which can reduce manufacturing variation in the tightening force of the movable core.

[0040] It should be noted that in the present embodiment the solenoid device 1 is used in the electromagnetic relay 10, however such a limitation of the present invention is not intended, and the solenoid device 1 can be used in an electromagnetic valve or the like.

[0041] In the following embodiments, the reference numerals used in the drawings, which are the same as the reference numerals of the first embodiment, denote corresponding and similar components as in the first embodiment, unless otherwise specified. Second embodiment

[0042] The present embodiment is an example in which the shape of the fixed core 3 is modified. As this is shown in the Fig. 12 and Fig. As shown in 13, in the present embodiment there is a projecting section 8S the side of the fixed core formed on the fixed core 3. The projecting section 8 S The side of the fixed core prevents deformation of the magnetic spring 5 to the minimum spring length L. MIN , when the movable core 4 is pulled to the access position (see Fig. 13).

[0043] In this way, a deformation of the magnetic spring 5 can be reduced to the minimum spring length L. MIN even more reliably avoided. More precisely, when the magnetic spring 5 contracts to a certain degree, the magnetic flux φ flows through the magnetic spring 5 in the direction Z. Thus, the magnetic flux φ in the magnetic spring 5 itself generates an electromagnetic force that causes it to contract in the direction Z. However, the aforementioned section 8 allows Son the side of the fixed core, which is designed as in the present embodiment, a suppression (prevention) of the contraction of the magnetic spring 5 to the minimum spring length L MIN This eliminates the need to apply the area of ​​the magnetic spring 5 near the minimum spring length L. MIN , i.e., the area with a significant variation in spring force among the products. Thus, a variation in the pulling force of the movable core 4 can be avoided.

[0044] Furthermore, as this allows in Fig. As shown in Figure 12, the formation of the projecting section 8s on the side of the fixed core reduces the length D in the Z direction of a space S between the fixed core 3 and the magnetic spring 5, while the movable core 4 is positioned at the separation position. As described above, passing an electric current through the electromagnetic coil 2 causes a portion of the magnetic flux φ to flow through the space S. The present embodiment allows for a reduction in the length D in the Z direction of the space S, which facilitates the flow of the magnetic flux φ. Consequently, the attracting force of the movable core 4 can be increased.

[0045] The second embodiment otherwise has a structure, function and effects that are similar to the structure, function and effects of the first embodiment. Third example

[0046] The present embodiment is an example in which the fixed core 3 is deformed. As this is shown in the Fig. 14 and Fig. As shown in Figure 15, in the present embodiment the fixed core 3 is provided with the projecting section 8s of the side of the fixed core as in the second embodiment. In the present embodiment, the projecting section 8s of the side of the fixed core is provided with a chamfered surface 81 (chamfered surface 81). S (the side of the fixed core). The beveled surface 81 S The side of the fixed core is constructed in such a way that it overlaps with a part (a section) of the magnetic spring 5 when viewed in the direction Z.

[0047] The functions and effects of the present embodiment are described below. In the present embodiment, the fixed core 3 is provided with the projecting section 8s on the side of the fixed core. Thus, as in the second embodiment, when the movable core 4 is pulled to the access position (see Figure 1), the fixed core 3 is provided with the projecting section 8s on the side of the fixed core. Fig. 15), a deformation of the magnetic spring 5 to the minimum spring length L MIN can be suppressed even more reliably. Furthermore, the projecting section 8s on the side of the fixed core is provided with the chamfered surface 81 (chamfered surface 81). S (the side of the fixed core). This design allows for a reduction in the distance D. S between the projecting section 8s of the side of the fixed core and the magnetic spring 5 in an oblique direction, as shown in Fig. Figure 14 shows this. This in turn facilitates the flow of the magnetic flux φ between the projecting section 8s on the side of the fixed core and the magnetic spring 5, which arises from the conduction of electric current through the electromagnetic coil 2, thus enabling the attracting force of the movable core 4 to be increased.

[0048] The third embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment. Fourth embodiment

[0049] The present embodiment is an example in which the shape of the fixed core 3 is modified. As this is shown in the Fig. 16 and Fig. As shown in Figure 17, in the present embodiment the fixed core 3 is provided with the projecting section 8s of the side of the fixed core as in the case of the third embodiment. The projecting section 8s of the side of the fixed core is provided with the chamfered surface 81 (the chamfered surface 81 S (the side of the fixed core). In the present embodiment, all sections of the magnetic spring 5 are constructed such that they are aligned with the chamfered surface 81. S overlap the side of the fixed core when viewed in the direction Z.

[0050] The functions and effects of the present embodiment are described below. The solenoid device 1 of the present embodiment is constructed such that all sections of the magnetic spring 5 have the chamfered surface 81 SThe sides of the fixed core overlap when viewed in the Z direction. Thus, the sections of the magnetic spring 5 can be positioned closer to the chamfered surface 81. S are arranged on the side of the fixed core. Accordingly, the magnetic flux φ flows easily between the beveled surface 81. S the side of the fixed core and the magnetic spring 5, which allows the attracting force of the movable core 4 to be increased.

[0051] The fourth embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment. Fifth embodiment

[0052] The present embodiment is an example in which the shape of the movable core 4 is modified. As this is shown in the Fig. 18 and Fig. As shown in Figure 19, in the present embodiment the movable core 4 has a projecting section 8 M provided on the side of the movable core. As shown in Fig. As shown in 19, the protruding section 8 suppresses M on the side of the movable core a deformation of the magnetic spring 5 up to the minimum spring length L MIN , when the movable core 4 is pulled towards the access position.

[0053] The functions and effects of the present embodiment are described below. The setup described above enables even more reliable prevention of deformation of the magnetic spring 5 down to the minimum spring length L. MIN , when the movable core 4 is pulled towards the access position.

[0054] The fifth embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment. Sixth embodiment

[0055] The present embodiment is an example in which the shape of the movable core 4 is modified. As this is shown in the Fig. 20 and Fig. As shown in Figure 21, in the present embodiment the movable core 4 with the projecting section 8 M the side of the movable core as in the fifth embodiment. Furthermore, in the present embodiment, the projecting section 8 M the side of the movable core is provided with the chamfered surface 81 (chamfered surface 81) M (the side of the movable core). The chamfered surface 81 MThe side of the movable core is constructed in such a way that it overlaps with all sections of the magnetic spring 5 when viewed in the direction Z.

[0056] The functions and effects of the present embodiment are described below. Forming the chamfered surface 81 M The side of the movable core allows for a reduction in the distance D. M between the magnetic spring 5 and the movable core 4, while the movable core 4 is not attracted, as shown in Fig. Figure 20 shows that this facilitates the flow of the magnetic flux φ between the magnetic spring 5 and the movable core 4, which allows the attractive force of the movable core 4 to be increased.

[0057] Furthermore, the present embodiment is constructed such that all sections of the magnetic spring 5 have the chamfered surface 81 Moverlap the side of the movable core when viewed in the direction Z.

[0058] Thus, as is shown in Fig. As shown in Figure 20, the entirety of the sections of the magnetic spring 5 is closer to the chamfered surface 81. M are arranged on the side of the movable core. Accordingly, the magnetic flux φ flows easily between the chamfered surface 81. M the side of the movable core and the magnetic spring 5, which allows the attracting force of the movable core 4 to be increased.

[0059] The sixth embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment.

[0060] It should be noted that the present embodiment is constructed such that the beveled surface 81 Mthe side of the movable core overlaps with all sections of the magnetic spring 5 when viewed in the direction Z, however, the present invention is not limited to this. For example, the chamfered surface 81 can M the side of the movable core overlaps with a part of the magnetic spring 5 when viewed in the direction Z. Seventh embodiment

[0061] The present embodiment is an example in which the shapes of the fixed core 3 and the movable core 4 are modified. As this is shown in Fig. As shown in Figure 22, in the present embodiment the projecting section 8 is formed on both the fixed core 3 and the movable core 4.

[0062] As this is in Fig. As shown in Figure 23, the projecting section 8 formed on the fixed core 3 (projecting section 8s of the side of the fixed core) and the projecting section 8 formed on the movable core 4 (projecting section 8) suppress (avoid) M (the side of the movable core) a deformation of the magnetic spring 5 to the minimum spring length L MIN , when the movable core 4 is attracted.

[0063] The projecting section 8s of the side of the fixed core is provided with the chamfered surface 81 (chamfered surface 81). S (the side of the fixed core). Furthermore, the projecting section 8 M the side of the movable core is also provided with the chamfered surface 81 (chamfered surface 81) M (the side of the movable core). The chamfered surfaces 81 are designed such that they overlap with all sections of the magnetic spring 5 when viewed in the Z direction.

[0064] The functions and effects of the present embodiment are described below. In the present embodiment, both the fixed core 3 and the movable core 4 are connected to the projecting section 8 (8 S and 8 M ) provided.

[0065] This allows for a reduction in the distance D S between the fixed core 3 and the magnetic spring 5 and also at the distance D M between the movable core 4 and the magnetic spring 5. Accordingly, the flow of the magnetic flux φ is facilitated, which allows the attracting force of the movable core 4 to be increased.

[0066] Furthermore, the solenoid device 1 of the present embodiment is constructed such that all sections of the magnetic spring 5 have the chamfered surface 81 S the side of the fixed core and the beveled surface 81 Moverlap the side of the movable core when viewed in the direction Z.

[0067] Thus, all sections of the magnetic spring 5 can be moved closer to the beveled surface 81. S the side of the fixed core and also closer to the beveled surface 81 M are arranged on the side of the movable core. Accordingly, the magnetic flux φ flows easily between the chamfered surface 81. S the side of the fixed core and the magnetic spring 5 and between the magnetic spring 5 and the chamfered surface 81 M the side of the movable core, which allows the attracting force of the movable core 4 to be increased.

[0068] The seventh embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment. Eighth embodiment

[0069] The present embodiment is an example in which the shapes of the fixed core 3 and the movable core 4 are modified. As shown in the Fig. 24 and Fig. As shown in Figure 25, in the present embodiment the fixed core 3 and the movable core 4 with their respective projecting sections 8 (the projecting section 8s on the side of the fixed core and the projecting section 8 M the side of the movable core) as in the seventh embodiment. In addition, the individual projecting sections 8 (8s and 8) are provided. M ) with the beveled surfaces 81 (the beveled surface 81 S the side of the fixed core and the chamfered surface 81 M the side of the movable core). The two chamfered surfaces 81 S and 81 M are parallel to each other.

[0070] The functions and effects of the present embodiment are described below. In the present embodiment, the two chamfered surfaces 81 S and 81 M , i.e., the beveled surface 81 S the side of the fixed core and the chamfered surface 81 M the side of the movable core, parallel to each other.

[0071] This allows for a minimization of any possible gap between the beveled surface 81 S the side of the fixed core and the magnetic spring 5 and a minimization of a possible gap between the chamfered surface 81 M the side of the movable core and the magnetic spring 5, when the movable core 4 is attracted, as shown in Fig. Figure 25 shows that the movable core 4 can be continuously attracted by a stronger attractive force.

[0072] The eighth embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment. Ninth embodiment

[0073] In the present embodiment, the shapes of the fixed core 3 and the movable core 4 and the direction of the magnetic spring 5 are changed. As shown in the Fig. 26 and Fig. As shown in Figure 27, in the present embodiment the central section 51 of the magnetic spring 5 is directed towards the fixed core 3, and the circumferential section 52 of the magnetic spring 5 is directed towards the movable core 4. Furthermore, the fixed core 3 and the movable core 4 are each provided with the projecting section 8. The projecting sections 8 (8 S and 8 M ) prevent the magnetic spring 5 from reaching the minimum spring length L MINis deformed when the movable core 4 is tightened.

[0074] Furthermore, the projecting section 8s of the side of the fixed core has the chamfered surface 81 S the side of the fixed core, and the projecting section 8 M the side of the movable core is with the chamfered surface 81 M the side of the movable core. The chamfered surfaces 81 S and 81 M are constructed in such a way that they overlap with all sections of the magnetic spring 5 when viewed in the direction Z.

[0075] The ninth embodiment otherwise has a structure, functions and effects that are similar to the structure, functions and effects of the first embodiment.

Claims

[1] Solenoid device (1) with: an electromagnetic coil (2) through which an electric current is passed to generate a magnetic flux (φ); a fixed core (3) which is arranged in the electromagnetic coil (2); a movable core (4) which performs a reciprocating movement in an axial direction of the electromagnetic coil (2) depending on whether an electric current passes through the electromagnetic coil (2); a magnetic spring (5) arranged between the fixed core (3) and the movable core (4) and comprising a magnetic substance, wherein the magnetic spring (5) biases the movable core (4) in a direction away from the fixed core (3) in the axial direction; and a yoke (6) which is included in a magnetic circuit (C) in which the magnetic flux (φ) flows, wherein the magnetic circuit (C) further comprises the magnetic spring (5), the movable core (4) and the fixed core (3), wherein When an electric current passes through the electromagnetic coil (2), the movable core (4) is attracted to an access position by an electromagnetic force against a spring force of the magnetic spring (5), the access position being relatively close to the fixed core (3), the electromagnetic force arising from the conduction of the electric current; and when the conduction of the electric current through the electromagnetic coil (2) is stopped, the movable core (4) is moved to a separation position by the spring force of the magnetic spring (5), the separation position being farther from the fixed core (3) than the access position. the magnetic spring (5) comprises a leaf spring element (50) which has the magnetic substance and is wound in such a spiral manner that a thickness direction of the leaf spring element (50) coincides with a radial direction of the electromagnetic coil (2), wherein a central section (51) of the magnetic spring (5) is biased to one side in the axial direction compared to a circumferential section (52) of the magnetic spring (5), and When the movable core (4) is attracted to the access position, the magnetic spring (5) is prevented from extending to a minimum spring length (L). MIN ) is deformed, which corresponds to a width of the leaf spring element (50) in the axial direction. [2] Solenoid device (1) according to claim 1, wherein the fixed core (3) is provided with a projecting section (8s) of the side of the fixed core (3) which projects from the fixed core (3) to the movable core (4) in the axial direction and causes a deformation of the magnetic spring (5) to the minimum spring length (L MIN ) is avoided when the movable core (4) is pulled towards the access position. [3] Solenoid device (1) according to claim 2, wherein the projecting section (8s) of the side of the fixed core (3) has a chamfered surface (81) S ) the side of the fixed core (3) is provided which overlaps at least a section of the magnetic spring (5) when viewed in the axial direction. [4] Solenoid device (1) according to claim 3, wherein all sections of the magnetic spring (5) are joined with the chamfered surface (81) S) overlap the side of the fixed core (3) when viewed in the axial direction. [5] Solenoid device (1) according to any one of claims 1 to 4 wherein the movable core (4) has a projecting section (8) M ) the side of the movable core (4) is provided which projects from the movable core (4) to the fixed core (3) in the axial direction and causes a deformation of the magnetic spring (5) to the minimum spring length (L MIN ) is avoided when the movable core (4) is pulled towards the access position. [6] Solenoid device (1) according to claim 5, wherein the projecting section (8 M ) the side of the movable core (4) with a chamfered surface (81 M ) the side of the movable core (4) is provided which overlaps at least a section of the magnetic spring (5) when viewed in the axial direction. [7] Solenoid device (1) according to claim 6, wherein all sections of the magnetic spring (5) are joined with the chamfered surface (81) M ) the side of the movable core (4) overlap when viewed in the axial direction. [8] Solenoid device (1) according to any one of claims 1 to 7, wherein the fixed core (3) is provided with a projecting section (8s) of the side of the fixed core (3) which causes a deformation of the magnetic spring (5) to the minimum spring length (L MIN ) avoids when the movable core (4) is pulled to the access position, and the movable core (4) with a projecting section (8 M ) the side of the movable core (4) is provided which causes a deformation of the magnetic spring (5) to the minimum spring length (L MIN ) is avoided when the movable core (4) is pulled towards the access position. [9] Solenoid device (1) according to claim 8, wherein the projecting section (8s) of the side of the fixed core (3) and the projecting section (8 M ) the side of the movable core (4) with respective chamfered surfaces (81 S and 81 M ) are provided, each of which overlaps with at least one section of the magnetic spring (5), and wherein the two chamfered (81 S and 81 M ) surfaces are parallel to each other.

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