Rotary Solenoid

Abstract

To increase the number of stop positions, promote energy conservation by reducing power consumption, suppress heat generation, stabilize rotational torque characteristics, and suppress an impact force generated at a time of a stop at an end terminal to improve the overall durability.SOLUTION: An inner surface 2mi of a yoke body 2m and magnetically connected surfaces 2cpo, 2cqo of core parts 2cp, 2cq are magnetically connected with each other through a void portion Gs. In addition, a gap Lg of the void portion Gs is set so that a rotary torque characteristic Pi as of when not energized with respect to an angle in a rotary angle range Zr that is set with respect to a magnet rotor part Mr, has a rotational torque Tr directed oppositely with respect to a rotational torque characteristic Po as of when there is no gap.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotary solenoid that displaces a magnet rotor section within a predetermined rotational angle range by passing current through a stator section. [Background technology]

[0002] Conventionally, as rotary solenoids comprising a cylindrical yoke main body, a pair of core portions protruding from the inner peripheral surface of the yoke main body toward the center at 180° opposite each other, a stator portion having coil portions wound around each core portion, and a magnet rotor portion supported for free rotation at the center position of the end face portion of the casing portion, there are known the solenoid disclosed in Patent Document 1 and the rotary solenoid device disclosed in Patent Document 2.

[0003] The solenoid in Document 1 is a solenoid comprising a cylindrical casing, an end cover that closes the opening of the casing, a coil bobbin housed in the casing, one or more coils wound around the coil bobbin, one or more pin terminals that are attached to the coil bobbin and connect the wire ends leading out from the coil, and a movable part having a magnet that is displaced when electricity is passed through the coil. In particular, the solenoid is configured with a through hole portion provided in the coil bobbin, and a pin terminal that has an intermediate mounting portion that, when inserted into one end opening of the through hole portion, can stop the wire end at an intermediate position where it can be connected to the wire connection portion and at a final position where the wire connection portion is shielded by a barrier portion in the coil bobbin, and has a pin main body portion that protrudes from the other end opening of the through hole portion in the final position.

[0004] Furthermore, the rotary solenoid device in the same document 2 aims to make the entire device small and compact, eliminating the problem of unnecessary installation space being taken up, and reducing the number of parts to reduce costs and improve ease of assembly. Specifically, in a rotary solenoid device configured by attaching an acting member to the shaft of a rotary solenoid body, the acting member is formed from a plate material, a restricting hole portion is provided in this plate material, and a restricting protrusion portion is provided on one end face of the rotary solenoid body that engages with the restricting hole portion to restrict the rotational displacement range of the acting member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-39804 A [Patent Document 2] JP 2001-258233 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional rotary solenoid (solenoid, rotary solenoid device) described above, as shown in FIG. 10, the basic configuration is such that the yoke portion 2 constituting the stator portion Ms is composed of a pair of core portions 2cp, 2cq that protrude opposite each other at 180° toward the center from the inner surface 2mi of a cylindrical yoke main body portion 2m, and the yoke main body portion 2m and the core portions 2cp, 2cq are in close contact (or formed integrally) with each other from the standpoint of reducing magnetic resistance. During operation, current is passed forward or reverse through the coils 3p, 3q wound around the core portions 2cp, 2cq to generate fixed magnetic poles N or S, and the magnet rotor portion Mr is rotated to one side or the other, causing the stopper 12s integral with the magnet rotor portion Mr to abut against one regulating portion 12p (first position X1) or the other regulating portion 12q (second position X2), which regulates the rotation angle range. Therefore, conventional rotary solenoids had the following problems to be solved.

[0007] First, the number of switchable positions is limited to two positions. Figure 9 shows the rotational torque Tr of the conventional rotary solenoid described above. When the power supply is released in a state where the stopper 12s is in contact with the first position X1 in Figure 10, that is, when the power supply is not released, the rotational torque Tr generates a rotational torque Tr that attracts the stopper 12s in a direction to hold the stopper 12s in the first position X1. Similarly, when the power supply is released in a state where the stopper 12s is in contact with the second position X2, the rotational torque Tr generates a rotational torque Tr that attracts the stopper 12s in a direction to hold the stopper 12s in the second position X2. Therefore, the number of switchable positions is limited to two positions. Therefore, in order to stop the stopper 12s at the third position, it is necessary to combine two rotary solenoids, which increases the overall cost and further increases the size of the mechanism.

[0008] Secondly, the rotation torque Tr is low at the start and high at the end, so the voltage used by the rotary solenoid depends on the low rotation torque of the magnet rotor at the start. Therefore, it is necessary to set the applied voltage high to compensate for the rotation torque, which is an obstacle to promoting energy saving, and is also a factor in the heat generation of the rotary solenoid and instability of the rotation torque characteristics. Moreover, since the acceleration of the magnet rotor is large near the end, a large impact force is generated when the end is stopped, and depending on the size of the load and the structure of the stopper mechanism, the reaction force associated with this impact force is transmitted to the stator part side via the magnet rotor and bearings, which is a drawback that causes the durability of the entire rotary solenoid to be reduced.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a rotary solenoid that solves the problems existing in the background art. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the rotary solenoid 1 according to the present invention is configured to include a cylindrical yoke main body 2m, a pair of core portions 2cp, 2cq protruding from an inner peripheral surface 2mi of the yoke main body 2m toward the center at an angle of 180°, a stator portion Ms having coil portions 3p, 3q wound around each of the core portions 2cp, 2cq, and a magnet rotor portion Mr supported rotatably at the center position of end surface portions 4s, 4t of a casing portion 4. In this configuration, the yoke main body 2m is provided with a cylindrical yoke main body 2m, a pair of core portions 2cp, 2cq protruding from an inner peripheral surface 2mi of the yoke main body 2m toward the center at an angle of 180°, and a stator portion Ms having coil portions 3p, 3q wound around each of the core portions 2cp, 2cq. The inner surface 2mi of the main body portion 2m and the magnetic connection surfaces 2cpo, 2cqo of the core portions 2cp, 2cq are magnetically connected via a gap Gs in which a synthetic resin material R forming the coil bobbins 11p, 11q is filled to provide filled resin portions 11fp, 11fq, by selecting a position for fixing the core portions 2cp, 2cq, and the spacing Lg of the gap Gs is set so that the rotational torque characteristic Pi when no current is applied for an angle in the rotational angle range Zr set for the magnet rotor portion Mr is opposite to the direction of the rotational torque Tr relative to the rotational torque characteristic Po when there is no gap.

[0011] In this case, according to a preferred embodiment of the invention, the rotation angle range Zr of the magnet rotor portion Mr can be set within ±30°. Effect of the Invention

[0012] The rotary solenoid 1 according to the present invention having such a configuration provides the following remarkable effects.

[0013] (1) The inner peripheral surface 2mi of the yoke body 2m and the magnetic connection surfaces 2cpo, 2cqo of the cores 2cp, 2cq are magnetically connected via the gap Gs, and the interval Lg of the gap Gs is set so that the rotational torque characteristic Pi when not energized for the angle in the rotational angle range Zr set for the magnet rotor Mr is opposite in direction to the rotational torque characteristic Po when there is no gap, so that the rotor can be stopped at the intermediate position where the rotational torque in the rotational angle range Zr is 0 in the de-energized state. This allows the number of stop positions to be set to three positions, namely, one end position, the other end position, and the intermediate position of the rotational angle range Zr. As a result, an additional rotary solenoid for increasing the stop positions is not required, which allows for significant cost reduction and avoids an increase in size of the entire mechanism.

[0014] (2) Since the applied voltage at the time of startup can be set low, energy saving can be promoted by reducing power consumption, heat generation can be suppressed, and the rotation torque characteristics can be stabilized. Moreover, since the acceleration of the magnet rotor part Mr near the end can be reduced, the impact force generated when the end is stopped can be suppressed, and the reaction force caused by this impact force can be reduced from being transmitted to the stator part Ms side via the magnet rotor part Mr and the end face parts 4s, 4t having the bearing holes, thereby improving the durability of the entire rotary solenoid 1.

[0015] (3) The coils 3p, 3q are wound around the coil bobbins 11p, 11q attached to the outer casing of the cores 2cp, 2cq, which not only provides the original insulating function of insulating the cores 2cp, 2cq from the coils 3p, 3q, but also ensures positioning by providing the gap Gs between the yoke body 2m and the cores 2cp, 2cq. This makes it easy to obtain a highly reliable rotary solenoid 1.

[0016] (4) Since the gap Gs is formed by selecting the position where the core portions 2cp and 2cq are fixed by the coil bobbins 11p and 11q, it can be accommodated by changing the shape of the coil bobbins 11p and 11q. This makes it possible to easily form the gap Gs with high accuracy.

[0017] (5) Since the synthetic resin material R that forms the coil bobbins 11p, 11q is filled into the gap Gs to provide the filled resin portions 11fp, 11fq, the coil bobbins 11p, 11q can be molded together by insert molding, etc. This makes it possible to stably maintain the spacing Lg of the gap Gs and to easily mold the gap Gs as part of the coil bobbins 11p, 11q without changing the mold, etc.

[0018] (6) In a preferred embodiment, by setting the rotation angle range Zr of the magnet rotor portion Mr to within ±30°, the effective rotation angle range Zr of the present invention can be covered, so that a stable and reliable rotary solenoid 1 can be obtained that can enjoy the effects of the present invention from the standpoint of implementation. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a cross-sectional rear view including an enlarged cross-sectional view of a part of a rotary solenoid according to a preferred embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional plan view of the rotary solenoid; [Diagram 3] FIG. 3 is a side view of the coil bobbin of the rotary solenoid as viewed from above in FIG. 2; [Figure 4] FIG. 2 is a graph showing the rotation angle range vs. rotation torque characteristics when the rotary solenoid is not energized, with the gap width of the rotary solenoid as a parameter; [Diagram 5] A graph showing the rotation angle range (±30°) vs. rotation torque characteristics when the rotary solenoid has a gap of 0.5 mm and when it is de-energized and when it is energized at 0.5 A, and a graph showing the rotation angle range vs. rotation torque characteristics when it is de-energized as a parameter. [Figure 6] FIG. 2 is a front view of the rotary solenoid in one of the stop positions; [Figure 7] FIG. 2 is a front view of the rotary solenoid at a stop position in the middle position; [Figure 8] FIG. 2 is a front view of the rotary solenoid at the other stop position; [Figure 9] A graph showing the rotational torque characteristics of a rotary solenoid according to the prior art, with no current and with a current of 0.5 A applied, versus the rotation angle range (±30°) [Figure 10] FIG. 1 is a cross-sectional front view including an enlarged cross-sectional view of a part of a rotary solenoid according to a conventional technique; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0021] First, the overall configuration of a rotary solenoid 1 according to this embodiment will be specifically described with reference to FIGS. 1 to 3. FIG.

[0022] The rotary solenoid 1 includes, as its main components, a yoke body 2m, core portions 2cp and 2cq, coil portions 3p and 3q, a casing portion 4, a magnet rotor portion Mr, and coil bobbins 11p and 11q.

[0023] In this case, the stator section Ms is made up of a cylindrical yoke body 2m, a pair of cores 2cp, 2cq protruding from an inner peripheral surface 2mi of the yoke body 2m toward the center, and coils 3p, 3q wound around each of the cores 2cp, 2cq. As shown in FIG. 2, the yoke body 2m constitutes a part of the casing section 4, and the casing section 4 is made up of the yoke body 2m, a front end cover (end surface section) 4s that closes the front end opening of the yoke body 2m, and a rear end cover (end surface section) 4t that closes the rear end opening of the yoke body 2m. Therefore, the yoke body 2m serves as a part of the casing section 4 in addition to its original function as the yoke body 2m. The yoke body 2m is formed into a cylindrical shape using a carbon steel material or the like. In addition, as shown in FIG. 2, the front end cover 4s is fitted into the front end opening of the yoke main body 2m to close it, and the rear end cover 4r is also fitted into the rear end opening of the yoke main body 2m to close it, and the rear end cover 4r is also formed as a single unit into a disk shape.

[0024] Furthermore, a bearing hole 21 that supports the front side of the drive shaft 5s in the magnet rotor part Mr, which will be described later, is provided at the center of the front end cover 4s, and a bearing hole 22 that supports the rear side of the drive shaft 5s in the magnet rotor part Mr, is provided at the center of the rear end cover 4t. Since the front end cover 4s and the rear end cover 4t are required to have a bearing function and an insulating function, respectively, they are desirably formed from a lubricating resin material that has insulating properties, heat resistance, and high slidability.

[0025] On the other hand, a pair of core portions 2cp, 2cq protruding from an inner peripheral surface 2mi of the yoke main body 2m toward the center at 180° opposite each other are provided, and at least the yoke main body 2m and the pair of core portions 2cp, 2cq are prepared as three independent components. According to the present invention, the inner peripheral surface 2mi of the yoke main body 2m and the magnetic connection surfaces 2cpo, 2cqo of the core portions 2cp, 2cq are magnetically connected via a gap Gs, as shown in Figures 1 and 2. In this case, coil bobbins 11p, 11q made of a synthetic resin material R are attached to the outer peripheries of the pair of core portions 2cp, 2cq, and the coil portions 3p, 3q are wound around the coil bobbins 11p, 11q. Further, the coil bobbins 11p, 11q located on the magnetic connection surfaces 2cpo, 2cqo of the core portions 2cp, 2cq opposing the inner peripheral surface 2mi of the yoke body 2m are formed to extend along the inner peripheral surface 2mi of the yoke body 2m.

[0026] At this time, since the tip portion of the coil bobbin 11p located at the tip of the core portion 2cp and the tip portion of the coil bobbin 11q located at the tip of the core portion 2cq are close to each other, the tip portion of the coil bobbin 11p and the tip portion of the coil bobbin 11q are integrally formed via the connecting piece portions 11ju, 11jd, respectively, and the step portion formed by these connecting piece portions 11ju, 11jd has a positioning function of abutting against the tips of the core portions 2cp, 2cq. As a result, the coil bobbins 11p and 11q can be integrally molded as a continuous bobbin unit 11 as a whole. Note that it is preferable that the bobbin unit 11 is integrally formed as a whole from a highly flame-retardant insulating synthetic resin material (for example, syndiotactic polystyrene, etc.).

[0027] As a result, the core portions 2cp, 2cq are attached to the bobbin unit 11 or assembled by insert molding, and in this state, the magnet wire W, such as a copper wire, can be wound around each of the coil bobbins 11q, 11q using an automatic winding machine. In this way, when forming the coil portions 3p, 3q, if the coil portions 3p, 3q are formed by winding the wire around the coil bobbins 11p, 11q attached to the outer casings of the core portions 2cp, 2cq, in addition to the inherent insulating function of insulating the core portions 2cp, 2cq from the coil portions 3p, 3q, positioning can be reliably performed with the gap portion Gs between the yoke main body 2m and the core portions 2cp, 2cq interposed therebetween, so that a highly reliable rotary solenoid 1 can be easily obtained.

[0028] The bobbin unit 11 in this state can be inserted directly into the yoke body 2m and assembled. When assembled, as shown in FIG. 1, the outer surfaces of the four almost equally spaced outer circumferential portions of the bobbin unit 11 come into surface contact with the inner circumferential surface 2mi of the yoke body 2m, and the bobbin unit 11 is positioned in the radial direction. Furthermore, the above-mentioned shapes of the connecting pieces 11ju, 11jd and the coil bobbins 11p, 11q allow the bobbin unit 11 to be positioned in the radial direction relative to the core portions 2cp, 2cq, so that the spacing Lg of the gaps Gs can be easily set. In this way, if the gaps Gs are formed by selecting the positions at which the core portions 2cp, 2cq are fixed by the coil bobbins 11p, 11q, the gaps Gs can be easily formed because the gaps Gs can be easily formed with high accuracy since the gaps Gs can be adjusted by changing the shapes of the coil bobbins 11p, 11q.

[0029] The gap Gs may be formed simply as an air space, but may also be formed as filled resin portions 11fp, 11fq by filling synthetic resin material R forming the coil bobbins 11p, 11q as shown in Figs. 1 to 3. In this way, if the gap Gs is filled with synthetic resin material R forming the coil bobbins 11p, 11q to provide filled resin portions 11fp, 11fq, the gap Gs can be molded together with the coil bobbins 11p, 11q by insert molding or the like, so that the gap Gs can be stably maintained at a distance Lg and can be easily molded as a part of the coil bobbins 11p, 11q without changing the mold or the like. In this manner, the stator portion Ms can be configured.

[0030] On the other hand, the magnet rotor section Mr includes a drive shaft 5s made of a magnetic material such as stainless steel, and a cylindrical magnet 5m fixed to the middle of the drive shaft 5s. The magnet 5m is a two-pole magnet with an S pole and an N pole magnetized at 180° opposing positions in the radial direction. As shown in Figures 1 and 2, the front side of the drive shaft 5s is rotatably supported by a bearing hole 21 provided in the center of the front-end cover 4s, and the rear side of the drive shaft 5s is rotatably supported by a bearing hole 22 provided in the center of the rear-end cover 4t.

[0031] In addition, a stopper mechanism 12 is disposed near the front end of the magnet rotor part Mr located outside the casing part 4 to restrict the rotation angle range of the magnet rotor part Mr to a predetermined angle range. The stopper mechanism 12 is composed of a lever-shaped stopper 12s having one end fixed to the magnet rotor part Mr, and a pair of restricting parts 12p, 12q disposed on one side and the other side to restrict the rotation angle range of the stopper 12s. That is, the stopper mechanism 12 has a function of restricting the rotation angle range of the magnet rotor part Mr to a predetermined angle range, and is composed of a lever-shaped stopper 12s having one end fixed to the magnet rotor part Mr, and a pair of restricting parts 12p, 12q disposed on one side and the other side to restrict the rotation angle range of the stopper 12s. In particular, the stopper mechanism 12 in FIG. 1 sets the rotation angle range Zr of the magnet rotor part Mr to ±15°.

[0032] Next, the gap Gs, which is a main component of the rotary solenoid 1 according to this embodiment, will be specifically described with reference to FIGS.

[0033] As mentioned above, in this type of rotary solenoid, magnetic loss is typically reduced by closely contacting or forming integrally between the inner surface 2mi of the yoke main body portion 2m and the magnetic connection surfaces 2cpo, 2cqo of the core portions 2cp, 2cq.

[0034] On the other hand, there is room for modification from the viewpoint of improving the magnetic properties (rotational torque properties) for a certain purpose. Therefore, this time, the effect of the presence or absence of the gap Gs was verified, and the spacing Lg of the gap Gs was selected from the viewpoint of setting the switching position to three positions, and further, from the viewpoint of improving energy saving and durability.

[0035] First, the influence of the presence or absence of the gap Gs when the current is not applied was verified. This verification was performed by simulation, and in Fig. 4, the torque value of the rotation torque Tr [Nm] in the rotation angle range "-90 to +90 [°]" when the current is not applied was obtained by setting the distance Lg of the gap Gs of the rotary solenoid 1 as a parameter, i.e., the distance Lg [mm] as "0", "0.1", "0.2", "0.3", "0.4", and "0.5".

[0036] As is clear from Fig. 4, the rotation torque characteristic for the rotation angle range changes greatly depending on the size of the gap Lg of the gap Gs. Specifically, when the gap Lg (mm) is relatively small, i.e., "0" and "0.1" (mm), when the rotation angle changes from "-30 to 0" (°), the rotation torque Tr (Nm) changes from a negative value to "0", and when the rotation angle changes from "0 to 30" (°), the rotation torque Tr (Nm) changes from 0 to a positive value. On the other hand, when the gap Lg (mm) is relatively large, i.e., "0.2", "0.3", "0.4", and "0.5" (mm), when the rotation angle changes from "-30 to 0" (°), the rotation torque Tr (Nm) changes from a positive value to "0", and when the rotation angle changes from "0 to 30" (°), the rotation torque Tr (Nm) changes from 0 to a negative value.

[0037] Fig. 5 shows the rotation angle range "-60 to 60°" of Fig. 4, and also shows the cases where the gap Lg (mm) is 0.5 (this embodiment) and 0 (conventional technology). As is clear from Fig. 5, the rotation torque characteristic Pi when not energized has a direction (direction of action) of the rotation torque Tr opposite to that of the rotation torque characteristic Po when there is no gap. This tendency becomes stronger as the gap Lg (mm) becomes larger, as shown in the results of Fig. 4.

[0038] Therefore, in the case of the rotary solenoid 1 of the present embodiment, it is considered most effective to select the gap Lg (mm) of the gap Gs to "0.5" (mm). The same tendency is observed in the cases of "0.3" and "0.4" (mm), and it is possible to select at least in the range of "0.3" to "0.5" (mm). It is also desirable to set the rotation angle range Zr of the magnet rotor part Mr within ±30 (°). By setting it in this way, as is clear from FIG. 5, the effective rotation angle range Zr of the present invention can be covered, so that a stable and reliable rotary solenoid 1 that can enjoy the effects of the present invention from the viewpoint of implementation can be obtained. In FIG. 5, the rotation torque characteristic Pdi was obtained when 0.5 (A) current was applied in addition to when no current was applied, and the tendency was the same as when no current was applied, except that a rotation torque of 0.04 (Nm) was generated near the rotation angle of 0 (°). In the figure, Pdo indicates the rotational torque characteristics when there is no gap and a current of 0.5 A is applied.

[0039] In the case of a typical (conventional) rotary solenoid, the flow of magnetic flux is mainly magnet 5m (N pole) → core part 2cp → yoke main body part 2m → core part 2cq → magnet 5m (S pole). In contrast, in the rotary solenoid 1 according to the present embodiment, which is provided with a gap part Gs (magnetic resistance), the amount of magnetic flux flowing from magnet 5m (N pole) → core part 2cp → core part 2cq → magnet 5m (S pole) can be increased. As a result, it is assumed that the rotational torque characteristic Pi when not energized can be changed by changing the balance between the magnetic flux flowing between the yoke main body part 2ms and the core parts 2cp and 2cq.

[0040] Next, the operation (function) of the rotary solenoid 1 according to this embodiment will be specifically described with reference to FIGS.

[0041] First, as shown in Fig. 6, when a current is applied in the forward direction to the coil portions 3p and 3q, an S pole is generated in the core portion 2cp and an N pole is generated in the core portion 2cq. As a result, the S pole of the magnet 5m is attracted to the N pole of the core portion 2cq and the N pole of the magnet 5m is attracted to the S pole of the core portion 2cp, so that the stopper 12s comes into contact with one of the restricting portions 12p due to the rotational displacement of the magnet rotor portion Mr. In other words, it stops at the first position X1.

[0042] On the other hand, if the current supply is released in this state, that is, if the current supply is switched off, the stopper 12s stops at an intermediate position between the restriction portions 12p and 12q due to the rotational displacement of the magnet rotor portion Mr, as shown in Fig. 7. In this case, due to the action of the core portions 2cp, 2cq, the N pole of the magnet rotor portion Mr is displaced in a direction away from the core portion 2cp and the S pole of the magnet rotor portion Mr is displaced in a direction away from the core portion 2cq in accordance with the rotational torque characteristic Pi shown in Fig. 5, and the magnet rotor portion Mr stops at the intermediate position where the rotational torque Tr is 0, that is, the third position X3.

[0043] Furthermore, in this state, if current is applied to the coil portions 3p and 3q in the opposite direction to the current application direction (forward direction) shown in Fig. 6, an N pole is generated in the core portion 2cp and an S pole is generated in the core portion 2cq as shown in Fig. 8. As a result, the S pole of the magnet 5m is attracted to the N pole of the core portion 2cp and the N pole of the magnet 5m is attracted to the S pole of the core portion 2cq, so that the stopper 12s comes into contact with the other regulating portion 12q due to the rotational displacement of the magnet rotor portion Mr. In other words, it stops at the second position X2.

[0044] In addition, when switching directly from the first position X1 to the second position X2, or from the second position X2 to the first position X1, as with a conventional rotary solenoid, the current flow direction can be immediately switched from the forward direction to the reverse direction, or from the reverse direction to the forward direction, without turning off the current, and two-position switching can be performed as in the conventional case.

[0045] Thus, according to the rotary solenoid 1 of this embodiment, as a basic configuration, the inner peripheral surface 2mi of the yoke main body 2m and the magnetic connection surfaces 2cpo, 2cqo of the cores 2cp, 2cq are magnetically connected through the gap Gs, and the interval Lg of the gap Gs is set so that the rotation torque characteristic Pi when not energized for the angle in the rotation angle range Zr set for the magnet rotor Mr is opposite in direction to the rotation torque characteristic Po when there is no gap, so that the rotary solenoid can be stopped at the intermediate position of the rotation angle where the rotation torque Tr in the rotation angle range Zr is 0 in the non-energized state. This allows the number of stop positions to be set to three positions, that is, one end position (first position X1), the other end position (second position X2), and the intermediate position (third position X3) of the rotation angle range Zr. As a result, an additional rotary solenoid for increasing the stop positions is not required, which makes it possible to significantly reduce costs and avoid an increase in size of the entire mechanism.

[0046] In addition, since the applied voltage at the time of startup can be set low, energy saving can be promoted by reducing power consumption, heat generation can be suppressed, and the rotation torque characteristics can be stabilized. Moreover, since the acceleration of the magnet rotor part Mr near the end can be reduced, the impact force generated when the end is stopped can be suppressed, and the reaction force caused by this impact force can be reduced from being transmitted to the stator part Ms side via the magnet rotor part Mr and the end face parts 4s, 4t having the bearing holes, thereby improving the durability of the entire rotary solenoid 1.

[0047] Although the preferred embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, numerical values, etc. can be changed, added, or deleted as desired without departing from the gist of the present invention.

[0048] For example, in the present invention, the pair of core portions 2cp, 2cq protruding from the inner peripheral surface 2mi of the yoke body 2m toward the center at an angle of 180° refers to one set, and does not exclude the case where two or more sets are included. Also, in the embodiment, the gap Gs has a spacing Lg of 0.5 mm, but as shown in FIG. 4, it can be confirmed that the same effect can be obtained even with a spacing Lg of 0.3 or 0.4 mm. In other words, any spacing Lg can be selected as long as it is 0.2 mm or more. [Industrial Applicability]

[0049] The rotary solenoid according to the present invention can be used in various types of rotary solenoids that have a function of displacing a magnet rotor portion within a predetermined rotational angle range by passing current through a stator portion. [Explanation of symbols]

[0050] 1: rotary solenoid, 2m: yoke body, 2mi: inner surface of yoke body, 2cp: core, 2cq: core, 2cpo: magnetic connection surface, 2cqo: magnetic connection surface, 3p: coil, 3q: coil, 4: casing, 4s: end surface, 4t: end surface, 11p: coil bobbin, 11q: coil bobbin, 11fp: filled resin, 11fq: filled resin, 12: stopper mechanism, Ms: stator, Mr: magnet rotor, Gs: gap, Lg: gap spacing, Zr: rotation angle range, Xc: central position, Tr: rotational torque, Pi: rotational torque characteristics when not energized when a gap is set, Po: rotational torque characteristics when not energized when there is no gap, R: synthetic resin material

Claims

1. a stator section having a cylindrical yoke body, a pair of core sections protruding from an inner circumferential surface of the yoke body at an angle opposite to each other by 180° toward the center, and a coil section wound around each core section, and a magnet rotor section rotatably supported at the center of an end surface of a casing section, characterized in that a coil bobbin is provided which is attached to an outer casing of the core section and has the coil section wound around it, the inner circumferential surface of the yoke body and a magnetic connection surface of the core section are magnetically connected through a gap which is filled with a synthetic resin material forming the coil bobbin and has a filled resin section, the gap being set so that the rotational torque characteristics when no current is applied for angles within a rotational angle range set for the magnet rotor section are opposite in direction to the rotational torque characteristics when there is no gap.

2. 2. The rotary solenoid according to claim 1, wherein the rotation angle range is set within ±30°.

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