JP5953545B2 - Rotary solenoid - Google Patents

Description

  The present invention relates to a rotary solenoid, and more particularly to a rotary solenoid that does not use a permanent magnet to obtain a rotational force.

  Some rotary solenoids are designed to be smaller and lighter by not using a permanent magnet that is widely used to obtain rotational force. That is, the permanent magnet is a component that occupies a large volume together with the rotor and the like, and is also a component that is relatively heavy. Furthermore, since it is a brittle part than the magnetic material used for a rotor etc., it is necessary to make it the structure which considered preventing a crack and a chip. Therefore, making it possible to obtain a rotational force without using a permanent magnet is a major point in reducing the size and weight of the rotary solenoid.

  Below, the prior art of the rotary solenoid which does not use a permanent magnet is demonstrated. FIG. 9 is a view showing a structure of a rotary solenoid according to the prior art, in which (a) is a perspective view and (b) is a cross-sectional view. In FIG. 9, 110 is a rotary solenoid, 111, 112, 113 and 114 are fixed magnetic poles, 115, 116, 117, 118, 119, 120 and 121 are extended parts, 122 is a rotor, 123, 124, 125 and 126 are Extension part, 127 is a rotor, 128, 129, 130 and 131 are extension parts, 132 is a drive shaft, 133 is a large diameter part, 134 is a small diameter part, 135 is a coil, 136 is a bobbin, and 137 is a case. .

  FIG. 9 shows a rotary solenoid disclosed in Japanese Patent Laid-Open No. 2008-166347. When energized to the coil 135, the rotary solenoid 110 extends the extended portions 123, 124, 125, and 126 of the rotor 122 provided in contact with the large-diameter portion 133 and the end of the drive shaft 132, and the extended portion of the fixed magnetic pole 111. 115, an attractive force is generated between the extended portion 116 of the fixed magnetic pole 112, the extended portion 116 of the fixed magnetic pole 113, and the extended portion 118 of the fixed magnetic pole 114. Similarly, the extended portions 128, 129, 130 and 131 of the rotor 127 provided so as to be in contact with the end portion of the large diameter portion 133 on the small diameter portion 134 side, the extended portion 119 of the fixed magnetic pole 111, and the fixed magnetic pole 112 An attractive force is also generated between the extended portion 120, the extended portion that does not appear in the figure of the fixed magnetic pole 113, and the extended portion 121 of the fixed magnetic pole 114. When such an attractive force is generated, the extending portion 123 of the rotor 122 and the extending portion 115 of the fixed magnetic pole 111 rotate in the approaching direction, and a magnetic balance is established between each extending portion and each extending portion. Rotate to the position where the condition occurs.

  According to the above configuration, the rotary solenoid 110 can be manufactured with a relatively simple structure, so that it is advantageous in terms of cost, can save space, and is excellent in mass productivity. In addition, the rotational torques of the rotors 122 and 127 are increased, the control operation of the operation and stop with respect to the drive shaft 132 is accurate, and reliability is obtained at the same time.

  However, in the above configuration, it is necessary to secure a certain thickness of the fixed magnetic poles 111, 112, 113, and 114 in order to suppress the magnetic resistance. Further, at the time of manufacturing, the drive shaft 132 in which the rotor 127 is press-fitted into the small diameter portion 134 side is inserted into the hollow portion of the bobbin 136 with the bobbin 136 sandwiched between the fixed magnetic poles 111, 112, 113, and 114. Since it is necessary to insert into the case 137 in a state, a high skill is required for the operator. In order to prevent the fixed magnetic poles 111, 112, 113, and 114 from rattling due to external vibration, the fixed magnetic poles 111, 112, 113, and 114 are strongly pressed against the case 137 by the elastic force of the bobbin 136. It is necessary to do so. However, when configured in this manner, a force that deforms the bobbin 136 is applied from the fixed magnetic poles 111, 112, 113, and 114, so that in some cases, the peripheral side surface of the hollow portion of the bobbin 136 and the large-diameter portion 133 of the drive shaft 132 Will be in contact.

JP 2008-166347 A

  In order to solve the above-mentioned problems, the present invention provides a rotary solenoid that does not use a permanent magnet to obtain a rotational force, can be reduced in size, can obtain a large rotational torque, and can be easily assembled. Objective.

  The invention according to claim 1 includes a rotor, a shaft directly or indirectly fixed to the rotor, a coil disposed in the vicinity of the rotor, the rotor and the coil, and a substantially cylindrical shape. In the rotary solenoid provided with a case, the rotor has a plurality of magnetic pole portions formed so as to extend radially from a central axis of the shaft, and the case is made of a magnetic material, The same number of openings as the plurality of magnetic poles are formed at portions facing each of the magnetic poles, and the peripheral area of the plurality of openings attracts the plurality of magnetic poles when the coil is energized. It is a rotary solenoid characterized by being made as a fixed magnetic pole part.

  According to a second aspect of the present invention, in the first aspect of the present invention, the shaft is formed of a non-magnetic material, is further formed in a substantially cylindrical shape, and the shaft is inserted therein, and the rotor Is a rotary solenoid characterized by comprising an auxiliary magnetic pole fixed.

  The invention according to claim 3 is the rotor according to claim 1 or 2, further comprising a plurality of magnetic pole portions formed so as to extend radially from the central axis of the shaft. The rotor and the another rotor are arranged so that the coil is interposed between them.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, further comprising: a first lid that closes an opening on the tip side of the shaft of the case; A second lid that closes an opening on the proximal end side of the shaft of the case; a first bearing and a second bearing that are respectively fixed to the first lid and the second lid;
The shaft is a rotary solenoid that is rotatably supported by the first bearing and the second bearing.

  The invention according to claim 5 is the invention according to claim 4, further comprising at least one stopper having a base end fixed to the second lid and provided with a cushioning material at the tip. A rotary solenoid characterized by the following.

  According to the first aspect of the present invention, since the peripheral region of the opening of the case is used as the fixed magnetic pole, if the thickness of the case is equal to the thickness of the fixed magnetic pole of the rotary solenoid according to the prior art, the fixed There is no need to provide magnetic poles separately, and even with such a thickness, the size of the case of the rotary solenoid according to the prior art can be reduced. Therefore, it is possible to reduce the size and obtain a large torque, and the number of parts can be reduced, so that the assembly is simplified.

  According to the second aspect of the invention, the shaft can be made nonmagnetic by providing the auxiliary magnetic pole. Therefore, a parasitic magnetic circuit that goes around the rotor from the rotor device to the shaft, the mechanism of the load device connected from the shaft to the shaft, and the portion of the load device mechanism that faces the opening of the case does not occur. Magnetic flux lines generated by energization can be efficiently utilized by generating torque.

  According to the third aspect of the present invention, since the structure is provided with two rotors and the coil and the rotor are made as close as possible, a large torque can be obtained and the coil is energized. The magnetic flux lines generated by can be efficiently used by generating the rotational force.

  According to invention of Claim 4, since the 1st bearing and the 2nd bearing are each being fixed to the 1st lid | cover and the 2nd lid | cover, rather than the structure which fixes a bearing with a fixed magnetic pole. It becomes easy to reduce the size of the rotary solenoid.

  According to the fifth aspect of the present invention, since the stopper is positioned on the base end side cover of the shaft, the screw of the stopper is formed when the screw hole for fixing to the other device is formed in the cover on the tip end side of the shaft. The holes do not interfere.

It is a figure (1) which shows the rotary solenoid which concerns on the 1st Embodiment of this invention, (a) is sectional drawing of the axial direction of a shaft, (b) is AA sectional view taken on the line. It is a figure (2) which shows the rotary solenoid which concerns on the 1st Embodiment of this invention, (c) is a right view, (d) is a front view. It is a figure (3) which shows the rotary solenoid which concerns on the 1st Embodiment of this invention, (e) is a left view, (f) is a rear view. It is a figure which shows the rotor which concerns on the 1st Embodiment of this invention, (a) is a front view, (b) is a left view, (c) is a right view. It is sectional drawing which shows the rotation state of the rotary solenoid which concerns on the 1st Embodiment of this invention, (a) shows the state before rotation, (b) shows the state after rotation. It is sectional drawing which shows the rotation state of the rotary solenoid which concerns on the 2nd Embodiment of this invention, (a) is sectional drawing in the state using a rotor with the wide tip of a magnetic pole, (b) is narrow at the tip of a magnetic pole. Sectional drawing of the state using a rotor is shown. It is sectional drawing which shows the rotation state of the rotary solenoid which concerns on the 3rd Embodiment of this invention, (a) shows the state before rotation, (b) shows the state after rotation. It is a right view which shows the state which wound the protective tape around the case. It is a figure which shows the structure of the rotary solenoid which concerns on a prior art, (a) is a perspective view, (b) is sectional drawing.

  First, the overall configuration of the rotary solenoid according to the first embodiment of the present invention will be described. 1A and 1B are views (1) showing a rotary solenoid according to a first embodiment of the present invention, in which FIG. 1A is a sectional view in the axial direction of a shaft, and FIG. 1B is a sectional view taken along line AA. . In FIG. 1, 10 is a rotary solenoid, 20 is a case, 20a is a distal end portion, 20b is a proximal end portion, 20c is an intermediate portion, 22 is an opening portion, 22a is an opening portion for wiring, 24, 25 and 26 are opening portions, 30, 31 and 32 are fixed magnetic pole portions, 33 and 34 are stepped portions, 35a and 35c are screw holes, 36 is a first rotor, 38 and 39 are magnetic pole portions, 41 is a second rotor, and 42, 43 and 44 are magnetic pole portions. 45, 46 and 47 are air gaps, 48 is a stopper, 49 is a shock absorbing rubber, 50 is an auxiliary magnetic pole, 51a and 51b are small diameter portions, 52 is a large diameter portion, 53 and 54 are step portions, 55 is a shaft, 55a Is a distal end portion, 55b is a base end portion, 56 is a first lid, 57 is a recessed portion, 58 is a second lid, 59 is a recessed portion, 60 and 61 are ball bearings, 62 is a spring, 62 is a base plate, and 64 is Cover, 65 is Down, 66 coils, 67 and 68 spacers, 70a and 70b are lead wires, 71 is a protective tube. FIG. 2 is a diagram (2) showing the rotary solenoid according to the first embodiment of the present invention, in which (c) is a right side view and (d) is a front view. In FIG. 2, 21 is an opening, 21a is a wiring opening, 27 and 29 are fixed magnetic poles, 35b and 35d are screw holes, 69a is a bolt, and the other symbols are the same as those in FIG. 3 is a view (2) showing the rotary solenoid according to the first embodiment of the present invention, (c) being a left side view, and (d) being a rear view. In FIG. 3, 23 is an opening, 23a is an opening for wiring, 28 is a fixed magnetic pole, 69b is a bolt, and other symbols are the same as those in FIG.

  An outline of the rotary solenoid 10 according to the first embodiment of the present invention will be described. The rotary solenoid 10 has a total of 6 magnetic poles, 3 poles each for two rotors. The case 20 has both a function as a housing that houses a component as a rotary solenoid and a function that generates the rotational force of the first rotor 36 and the second rotor 41. That is, as shown in FIG. 1B, the rotary solenoid 10 does not include a permanent magnet. The first rotor 36 and the second rotor 41 disposed inside the case 20 are disposed such that a bobbin 65 around which a coil 66 is wound is disposed between the distal end side and the proximal end side of the shaft 55. Further, as will be described later, the gaps between the magnetic pole portions 42, 43 and 44 of the second rotor 41 and the fixed magnetic pole portions 30, 31 and 32 are significantly smaller than the air gaps 45, 46 and 47. When energized, a strong attractive force is generated between the magnetic pole portions 42, 43 and 44 and the fixed magnetic pole portions 30, 31 and 32. The same applies to the first rotor 36, but the suction force becomes the rotational force of the shaft 55. The shaft 55 is fitted in a state of passing through the hollow portion of the auxiliary magnetic pole 50, and the first rotor 36 and the second rotor 41 are supported by the shaft 55 through the auxiliary magnetic pole 50. The shaft 55 is supported by a ball bearing 60 fitted to the first lid 56 and a ball bearing 61 fitted to the second lid 58.

  Next, each component will be described. The case 20 is formed in a substantially cylindrical shape by a magnetic material. Moreover, as shown in FIG. 1, since it has a role as a fixed magnetic pole which produces | generates the rotational force of the 1st rotor 36 and the 2nd rotor 41, it considers magnetic resistance etc. and is thicker than a general case. Is formed. Further, as shown in FIGS. 2 and 3, the openings 21, 22 and 23 and the openings 24, 25 and 26 are provided at positions corresponding to the first rotor 36 and the second rotor 41 in the axial direction of the shaft 55. Forming. The openings 21, 22 and 23 are formed so as to be aligned in the circumferential direction of the case 20 and at equal intervals. Of the peripheral regions of the openings 21, 22 and 23, the regions serving as gaps between these openings are the fixed magnetic pole portions 27, 28 and 29. That is, the fixed magnetic pole portions 27, 28, and 29 are located at positions corresponding to the first rotor 36 in the axial direction of the shaft 55, and thus face the three magnetic poles of the first rotor 36 described later in the case 20. When the coil 66 is energized, these three magnetic poles are attracted. Similarly, the openings 24, 25, and 26 are formed so as to be aligned in the circumferential direction of the case 20 and at equal intervals, and a region that becomes a gap between these openings is a fixed magnetic pole portion 30. , 31 and 32. Since the fixed magnetic pole portions 30, 31 and 32 are at positions corresponding to the second rotor 41 in the axial direction of the shaft 55, these three magnetic poles are attracted when the coil 66 is energized.

  Further, the first rotor 36 and the second rotor 41 will be described. 4A and 4B are views showing the rotor according to the first embodiment of the present invention, in which FIG. 4A is a front view, FIG. 4B is a left side view, and FIG. 4C is a right side view. In FIG. 4, 37 is a magnetic pole part, 40 is an opening part, and other code | symbol shows the same thing as FIG. Note that the first rotor 36 and the second rotor 41 have the same shape and size, and the description of FIG. 4 showing the first rotor 36 and the following description regarding FIG. Common.

  As shown in FIG. 4, in the first rotor 36, the magnetic pole portions 37, 38 and 39 extend radially from the center at equal intervals and in the same shape, and the magnetic pole portions 37, 38 and 39 and the fixed magnetic pole portion 27. , 28 and 29, the rotation is caused by the suction force generated. An opening 40 for fitting the auxiliary magnetic pole 50 is formed at the center of the first rotor 36. Further, in order to prevent breakage when the auxiliary magnetic pole 50 is fitted, the peripheral region of the opening 40 is formed to have a predetermined width or more. The shape of the magnetic pole portion is not limited to that shown in this embodiment, and can be changed as appropriate according to the required torque and rotation angle. Further, as will be described later, the number of magnetic poles of the rotor may be two or four or more. As shown in FIG. 1B, the second rotor 41 also rotates due to the attractive force generated between the magnetic pole portions 42, 43 and 44 and the fixed magnetic pole portions 30, 31 and 32. As described above, by providing the two rotors with the coil 66 interposed therebetween, more magnetic flux lines generated when the coil 66 is energized are taken into the magnetic circuit and efficiently converted into rotational force. can do.

  Next, the auxiliary magnetic pole 50 will be described. The auxiliary magnetic pole 50 is provided so as to surround the coil 66 together with the first rotor 36 and the second rotor 41 and the case 20, and constitutes a magnetic circuit when the coil 66 is energized. Further, as shown in FIG. 1 (a), the portion from the end portion is a small-diameter portion 51a and 51b having a relatively small meter, and the portion near the center is a large-diameter portion 52. The small diameter portion 51 a and the small diameter portion 51 b are portions where the first rotor 36 and the second rotor 41 are respectively fitted. Note that the press-fitting position can be easily determined by press-fitting the first rotor 36 and the second rotor 41 to the stepped portion 53 and the stepped portion 54 that are the boundary between the large-diameter portion 52. A bobbin 66 is inserted into the large-diameter portion 52, but has a diameter that can secure a predetermined gap with the bobbin 66 so as not to prevent the auxiliary magnetic pole 50 from rotating.

  The shaft 55 is fitted in a state of penetrating through the hollow portion of the auxiliary magnetic pole 50, and is formed of a nonmagnetic material. When a magnetic shaft is used, for example, when the load mechanism link mechanism is very close to the rotary solenoid, the magnetic flux lines flow through the link mechanism connected from the shaft to the shaft. Although a parasitic magnetic circuit that flows from the rotor and the rotor to the shaft through the opening is generated, the rotary solenoid of this embodiment does not generate such a parasitic magnetic circuit. Therefore, the magnetic flux lines can be efficiently used by generating torque. Further, a portion in the vicinity of the distal end portion of the shaft 55 is rotatably supported by the ball bearing 60, and a portion in the vicinity of the proximal end portion of the shaft 55 is supported by the ball bearing 61. Therefore, since the ball bearing 60 is fitted to the first lid 56 and the ball bearing 61 is fitted to the second lid 58, the shaft 55 is firmly supported by the two lids, and the center axis is shaken. There is nothing. Further, since these bearings supporting the shaft 55 are respectively fitted in the hollow portions of the separate lids, a space for housing the bearings in the case 20 is not required, and a structure that contributes to downsizing of the rotary solenoid. It can be said. The shaft 55 may be supported by another bearing such as a needle bearing or a dry bearing instead of the ball bearing.

  The first lid 56 and the second lid 58 are respectively fitted to both end portions of the case 20 and are press-fitted to a step portion formed near the end portion of the inner peripheral surface. In addition, on the inner surface of the first lid 56 and the second lid 58, a recessed portion 57 and a recessed portion 59 each having an opening for penetrating the shaft 55 are formed at the center, as described above. A ball bearing 60 and a ball bearing 61 are fitted from the inside. Incidentally, in order to prevent the rotating components from rattling in response to variations in the dimensions of the case 20 and the like, the gap between the auxiliary magnetic pole 50 and the ball bearing 60 and the gap between the auxiliary magnetic pole 50 and the ball bearing 61 are set. Are provided with spacers 67 and 68, respectively.

  A base plate 63 is provided on the outer surface of the second lid 58, and one end of a spring 62 is fixed to the base plate 63. The spring 62 is a spring type spring, the other end is fixed to the shaft, and the shaft 55 is rotated and returned to the original position. Further, the base plate 63 is provided with a cover 64 that covers the spring 62. The base plate 63 and the cover 64 are fixed to the second lid 58 by bolts 69a and 69b in FIG. Further, a stopper 48 is provided in a portion hidden by the base plate 63 of the second lid 58. The stopper 48 is formed in a bolt shape, is screwed into a screw hole formed in the second lid 58, and is provided with a ring-shaped buffer rubber 49 at the tip, so that the magnetic pole of the second rotor 41 is provided. The rotation of the second rotor 41 is restricted by contacting the portion 43.

  The bobbin 65 is wound with a coil wire that constitutes the coil 66, and is interposed between the first rotor 36 and the second rotor 41 without contacting the rotors as described above. Further, the bobbin 65 is provided in a state of being pushed into the case 20 and is held by the case 20. Further, as described above, the first rotor 36, the second rotor 41, and the auxiliary magnetic pole 50 are not in contact with each other, and the rotation of these rotating components is not hindered. In addition, the end of the coil wire is connected to the lead wires 71a and 71b, and the coil 66 is led to the outside through the wiring opening 21a provided in the vicinity of the opening 21. In this embodiment, the end portion of the coil wire and the lead wires 71a and 71b are connected to each other at the winding body portion of the bobbin 65. For example, the coil wire is connected to the opening or slit of the flange portion of the bobbin 65. Is connected to the lead wires 71a and 71b, and passes between the magnetic poles of the first rotor 36, and is led out from the opening formed in the first lid 56 to the outside. You may do it. In this case, it is not necessary to provide wiring openings 21a, 22a and 23a described later.

  Further, end portions of the lead wires 71a and 71b on the coil wire side are inserted into the protective tube 71, and the protective tube 71 is lightly tightened to the wiring opening 21a. The wiring opening 21 a is a small hole formed in the vicinity of the opening 21. As described above, when the lead wires 71a and 71b are led out from the wiring opening 21a when the lead wires 71a and 71b are formed near the opening 21, a tool is inserted from the opening 21 to grasp the lead wires 71a and 71b. Since the distal end portion of 71b can be moved toward the wiring opening 21a, there is an advantage that wiring work is facilitated. Moreover, since the wiring opening 22a and the wiring opening 23a are formed in the opening 22 and the opening 23, respectively, the lead wires 71a and 71b can be led out from three directions. In this embodiment, the wiring opening 21a is provided in the vicinity of the opening 21, but the formation position may be changed as appropriate according to the configuration of the coil, for example, on the opening 24 side. . Further, only one may be formed.

  Furthermore, the rotational state of the rotary solenoid according to the first embodiment of the present invention will be described. FIG. 5 is a cross-sectional view showing the rotation state of the rotary solenoid according to the first embodiment of the present invention, where (a) shows a state before rotation and (b) shows a state after rotation. Reference numerals used in FIG. 5 are the same as those in FIG.

  In a state where the coil 66 is not energized, the magnetic pole 43 of the second rotor 41 is urged by the spring 62 and pressed against the buffer rubber 49 of the stopper 48 as shown in FIG. When the coil 66 is energized, a magnetic circuit flows from the auxiliary magnetic pole 50 to the first rotor 36, further flows from the first rotor 36 to the case 20, from the case 20 to the second rotor 41, and returns from the second rotor 41 to the auxiliary magnetic pole 50. Generate. At this time, a suction force that reduces the air gap acts between the first rotor 36 and the second rotor 41 and the case 20. In other words, a force attracted to the closest magnetic pole portion 31 that is closest to the magnetic pole 43 of the second rotor 41 acts to rotate the second rotor 41 clockwise in FIG. 5B. Similarly, a force to rotate the magnetic poles 42 and 44 to the right acts. Since the force to rotate in the same direction also acts on each magnetic pole of the first rotor 36, the shaft 55 also rotates to the right. When the motor rotates by a predetermined angle, the magnetic pole 42 comes into contact with the buffer rubber 49 of the stopper 48 and stops rotating. When energization of the coil 66 is stopped, the coil 62 returns to the position shown in FIG.

  As described above, the rotary solenoid 10 according to the first embodiment of the present invention has the opening 21 at a position of the case 20 corresponding to the first rotor 36 and the second rotor 41 in the axial direction of the shaft 55. , 22 and 23 and the openings 24, 25 and 26 are provided with the fixed magnetic pole portions 27, 28 and 29 and the fixed magnetic pole portions 30, 31 and 32 in the case 20, and when the coil 66 is energized, Since the magnetic pole portions 37, 38 and 39 of the first rotor 36 and the magnetic pole portions 42, 43 and 44 of the second rotor 41 are respectively attracted, there is no need to separately provide a fixed magnetic pole, and the case 20 is fixed by the prior art. Even with the same thickness as the magnetic pole, the size can be reduced by the thickness of the case of the rotary solenoid according to the prior art. Therefore, it is possible to reduce the size and obtain a large rotational torque, and the number of parts can be reduced, so that the assembly is simplified. Further, since the two rotors are provided so as to interpose the coil 66, the torque can be increased. Further, since the auxiliary magnetic pole 50 is provided and the first rotor 36 and the second rotor 41 are fitted to the auxiliary magnetic pole 50 instead of the shaft, the shaft 55 does not need to be formed of a magnetic material. Therefore, even if an opening is provided in the case 20, it is possible to prevent the generation of a parasitic magnetic circuit. In addition, when the wiring opening 21a is formed in the vicinity of the opening 21 and the lead wires 71a and 71b are led out of the case 20, the opening 21 can be used, so that the lead wires 71a and 71b The derivation process becomes very simple. Further, since the ball bearings 60 and 61 are fitted to the first lid 56 and the second lid 58, a space for housing the bearings in the case 20 is unnecessary. Further, since the stopper 48 is provided on the second lid 58, it is not necessary to avoid the stopper when the screw hole for fixing to the load device is provided on the first lid 56 side.

  Furthermore, a rotary solenoid according to a second embodiment of the present invention will be described. 6A and 6B are cross-sectional views showing a rotating state of a rotary solenoid according to the second embodiment of the present invention, in which FIG. 6A is a cross-sectional view showing a state in which a rotor having a wide magnetic pole tip is used, and FIG. Sectional drawing of the state using the rotor with the narrow tip of is shown. In FIG. 6, 72 is a case, 73 and 74 are openings, 75 and 76 are fixed magnetic pole parts, 77 is a rotor, 78 and 79 are magnetic pole parts, 80 is a central part, 81 and 82 are air gaps, 83 is a rotor, Reference numerals 84 and 85 denote magnetic pole portions, and other reference numerals are the same as those in FIG. In FIG. 6, only one rotor is shown and the other rotor is omitted, but the other rotor has the same shape and size as the one rotor.

  In the rotary solenoid according to the second embodiment of the present invention, the two rotors of the rotary solenoid according to the first embodiment of the present invention are provided with a total of six magnetic poles, each having three poles. There are 4 poles, 2 poles each. That is, as shown in FIG. 6A, the rotor 77 includes a magnetic pole part 78 and a magnetic pole part 79, and is attracted to the fixed magnetic pole part 75 and the fixed magnetic pole part 76, respectively. Since the air gaps 81 and 82 are wide in the circumferential direction of the case 72, the rotation angle can be set larger than that of the rotary solenoid according to the first embodiment. . The central portions 80a and 80b of the rotor 77 need to have a certain thickness in order to prevent cracks and chips from occurring when the auxiliary magnetic pole 53 is press-fitted. Further, in FIG. 6A, the magnetic poles 78 and 79 of the rotor 77 are formed so as to expand in a fan shape toward the tip side, and the rotation angle is easily set to be large. However, the shape of these magnetic poles is necessary. It can change suitably according to the rotation angle and torque which become. That is, as shown in FIG. 6B, the magnetic poles 84 and 85 of the rotor 83 are examples formed so that the width becomes narrower toward the tip side, and the shape of the magnetic poles can be changed in this way.

  In addition, a rotary solenoid according to a third embodiment of the present invention will be described. FIGS. 7A and 7B are cross-sectional views showing a rotation state of a rotary solenoid according to the third embodiment of the present invention, where FIG. 7A shows a state before rotation, and FIG. 7B shows a state after rotation. In FIG. 7, 86 is a case, 87, 88, 89 and 90 are fixed magnetic pole portions, 91, 92, 93 and 94 are openings, 95 is a rotor, 96, 97, 98 and 99 are magnetic pole portions, 100, 101, Reference numerals 102 and 103 denote recesses, and 104, 105, 106, and 107 denote air gaps, and other reference numerals are the same as those in FIG. In FIG. 7, only one rotor is shown and the other rotor is omitted, but the other rotor has the same shape and size as the one rotor.

  In the rotary solenoid according to the third embodiment of the present invention, the two rotors of the rotary solenoid according to the first embodiment of the present invention are provided with a total of 6 magnetic poles, 3 poles each. There are 8 poles, 4 poles each. That is, the rotor 95 includes a magnetic pole part 96, a magnetic pole part 97, a magnetic pole part 98, and a magnetic pole part 99, and is attracted to the fixed magnetic pole part 87, the fixed magnetic pole part 88, the fixed magnetic pole part 89, and the fixed magnetic pole part 90, respectively. Is done. In this embodiment, since the four poles are used, the width of the air gaps 104, 105, 106, and 107 in the circumferential direction of the case 86 is reduced, and the recesses 100, 101, which are spaces for installing stoppers, are provided. 102 and 103 are also smaller. Therefore, in the rotary solenoid according to this embodiment, the maximum settable rotation angle is considerably smaller than that according to the first embodiment.

  Since the rotary solenoid according to the embodiment described above forms an opening with respect to the case, there may be a problem in dustproofness when used in this state. Therefore, a modified example that solves the problem of dustproofness will be described. FIG. 8 is a right side view showing a state where the protective tape is wound around the case. In FIG. 8, reference numeral 108 denotes a protective tape, and other reference numerals are the same as those in FIG.

  As shown in FIG. 8, the protective tape 108 is wound around the entire peripheral side surface of the case 20 so as to partially overlap. In addition, the part of the protective tube 71 is provided with an opening for cutting the protective tape 108 and taking out the protective tube 71. By taking such measures, it is possible to obtain a dustproof property equivalent to a rotary solenoid in which an opening is not formed in the case 20. Moreover, since the protective tape 108 is wound, the insulation with respect to movable parts, such as a rotor, can also be improved.

  In addition, this invention is not limited to the content demonstrated above, For example, in order to comprise as a thin rotary solenoid, you may comprise only one rotor. Two or more stoppers may be provided. Furthermore, it is good also as a structure which does not provide a stopper like the rotary solenoid currently disclosed by Unexamined-Japanese-Patent No. 2008-166347. Moreover, you may make it the structure which fits the base end part of a shaft to the recessed part of an auxiliary magnetic pole, without setting it as the structure which a shaft penetrates an auxiliary magnetic pole. Thus, various modifications can be made without departing from the scope described in each claim.

DESCRIPTION OF SYMBOLS 10 Rotary solenoid 20 Case 20a Tip part 20b Base end part 20c Intermediate part 21 Opening part 21a Wiring opening part 22 Opening part 22a Wiring opening part 23 Opening part 23a Wiring opening part 24 Opening part 25 Opening part 26 Opening part 27 Fixing Magnetic pole portion 28 Fixed magnetic pole portion 29 Fixed magnetic pole portion 30 Fixed magnetic pole portion 31 Fixed magnetic pole portion 32 Fixed magnetic pole portion 33 Stepped portion 34 Stepped portion 35a Screw hole 35b Screw hole 35c Screw hole 35d Screw hole 36 First rotor 37 Magnetic pole portion 38 Magnetic pole portion 39 Magnetic pole part 40 Opening part 41 Second rotor 42 Magnetic pole part 43 Magnetic pole part 44 Magnetic pole part 45 Air gap 46 Air gap 47 Air gap 48 Stopper 49 Buffer rubber 50 Auxiliary magnetic pole 51a Small diameter part 51b Small diameter part 52 Large diameter part 53 Step part 54 Stepped portion 55 Shaft 55a Tip portion 55b Base end portion 56 First lid 57 Recessed portion 58 First 2 Lid 59 Recessed part 60 Ball bearing 61 Ball bearing 62 Spring 63 Base plate 64 Cover 65 Bobbin 66 Coil 67 Spacer 68 Spacer 69a Bolt 69b Bolt 70a Lead wire 70b Lead wire 71 Protective tube 72 Case 73 Opening portion 74 Opening portion 75 Fixed magnetic pole Part 76 fixed magnetic pole part 77 rotor 78 magnetic pole part 79 magnetic pole part 80 central part 81 air gap 82 air gap 83 rotor 84 magnetic pole part 85 magnetic pole part 86 case 87 fixed magnetic pole part 88 fixed magnetic pole part 89 fixed magnetic pole part 90 fixed magnetic pole part 91 opening Portion 92 opening 93 opening 94 opening 95 rotor 96 magnetic pole portion 97 magnetic pole portion 98 magnetic pole portion 99 magnetic pole portion 100 concave portion 101 concave portion 102 concave portion 103 concave portion 104 air gap 105 air gap 106 air gap 107 air gap 10 Protective tape 110 Rotary solenoid 111 Fixed magnetic pole 112 Fixed magnetic pole 113 Fixed magnetic pole 114 Fixed magnetic pole 115 Extension part 116 Extension part 117 Extension part 118 Extension part 119 Extension part 120 Extension part 121 Extension part 122 Rotor 123 Extension Part 124 extension part 125 extension part 126 extension part 127 rotor 128 extension part 129 extension part 130 extension part 131 extension part 132 drive shaft 133 large diameter part 134 small diameter part 135 coil 136 bobbin 137 case

Claims (5)

A rotor, a shaft directly or indirectly fixed to the rotor, a coil disposed in the vicinity of the rotor, and a case that accommodates the rotor and the coil and is formed in a substantially cylindrical shape. In rotary solenoid,
The rotor includes a plurality of magnetic pole portions formed to extend radially from the central axis of the shaft;
The case is formed of a magnetic material, and the same number of openings as the plurality of magnetic pole portions are formed at portions facing the magnetic pole portions, and a peripheral region of the plurality of openings is connected to the coil. A rotary solenoid characterized by being formed as a fixed magnetic pole portion that attracts each of the magnetic pole portions when energized. The shaft is formed of a nonmagnetic material,
2. The rotary solenoid according to claim 1, further comprising an auxiliary magnetic pole formed in a substantially cylindrical shape, into which the shaft is inserted, and to which the rotor is fixed. Furthermore, another rotor formed with a plurality of magnetic pole portions formed to extend radially from the central axis of the shaft,
The rotary solenoid according to claim 1, wherein the rotor and the other rotor are arranged so that the coil is interposed between the rotor and the other rotor. Furthermore, a first lid for closing the opening on the distal end side of the shaft of the case, a second lid for closing the opening on the proximal end side of the shaft of the case, the first lid, A first bearing and a second bearing respectively fixed to the second lid;
The rotary solenoid according to any one of claims 1 to 3, wherein the shaft is rotatably supported by the first bearing and the second bearing.   5. The rotary solenoid according to claim 4, further comprising at least one stopper having a base end fixed to the second lid and provided with a cushioning material at a tip.

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