JP6125442B2 - Rotating shaft bearing device - Google Patents

Description

  The present invention relates to a bearing device for a rotating shaft that rotatably supports the rotating shaft by being provided in a casing such as a rotary solenoid.

  2. Description of the Related Art Conventionally, a bearing device provided in a rotary solenoid disclosed in Patent Document 1 is known as a bearing device having a bearing portion that rotatably supports a rotating shaft by being provided in a casing.

  The rotary solenoid disclosed in Patent Document 1 includes a shaft portion (rotating shaft) that is rotatably supported by a casing, one end fixed to the shaft portion, the other end being a free end, and a magnet. A movable part and a pair of electromagnetic coil parts having an iron core that is fixed to the casing and arranged at predetermined intervals on both sides in the movable direction of the movable part and that selectively attracts the movable part by being energized. In particular, when supporting the shaft portion, a pair of separately manufactured front and rear bearing portions are attached to the casing, and a bearing structure that rotatably supports the front and rear positions of the rotating shaft by this bearing portion ( The bearing device is adopted.

JP-A-11-178306

  However, the conventional rotating shaft bearing device described above has the following problems to be solved.

  First, the casing is mechanically strong and is often part of the magnetic circuit. Therefore, the casing is made of a metal material, and a separate bearing is attached to the casing. The rotating shaft is rotatably supported by the portion. Therefore, various disadvantages associated with the use of metal materials, specifically, there are limits to reducing the overall weight, inferior workability in manufacturing, and material costs associated with the materials are expensive. There were various disadvantages such as points.

  Secondly, a separate bearing part is attached to the front and rear of the casing, and the rotating shaft is rotatably supported by this bearing part, so that in addition to the casing, two bearing parts as separate parts are required, The man-hour for assembling the bearing portion is increased. Eventually, the increase in the parts cost due to the increase in the number of parts and the increase in the manufacturing cost due to the increase in the man-hours for assembly caused a cost increase that cannot be ignored.

  An object of the present invention is to provide a bearing device for a rotary shaft that solves the problems existing in the background art.

  In order to solve the above-described problem, a bearing device 1 for a rotary shaft according to the present invention is provided with a bearing portion 4 located on the front side and a rear side provided on a casing 3 of a rotary solenoid M that rotatably supports the rotary shaft 2. In constructing a bearing device having four bearing portions, a position corresponding to one corner portion P1 in the triangle is fixed to the rotary shaft 2 and corresponds to the remaining two corner portions P2 and P3 which are free ends. There is a movable body portion 7 having a magnet portion 7m that can be turned by generating an S pole and an N pole at each position, and a single coil 8c that is fixed to the casing 3 and has one coil end face 8s facing the magnet portion 7m. Then, a field control unit 8 that can attract or repel the movable body part 7 by power supply control, and a movable body regulation using an inner wall of the casing 3 that restricts the range in which the movable body part 7 turns to a predetermined range Zr. Constituting the rotary solenoid M and a part 9.

  In addition, the bearing portion 4 is formed to protrude in the axial direction Fs from the surface 3f of the casing 3 so as to have a predetermined thickness Dt with respect to the axial direction Fs, and a predetermined ring thickness Dr with respect to the radial direction Fd. The synthetic resin material R is integrally formed with the casing 3 so as to have a ring shape, and is arranged on the end surface of the bearing portion 4 at predetermined intervals La along the circumferential direction Fc, and the bottom portion 5d has a predetermined thickness. By selecting Lb, a plurality of tolerance absorbing recesses 5 that absorb thermal expansion and contraction are formed, and the gap between the tolerance absorbing recess 5 and the inner peripheral surface 4s of the bearing portion 4 is based at least on the synthetic resin material R. The thickness Lc is selected to absorb the tolerance of the diameter of the inner peripheral surface 4s.

  In this case, according to a preferred aspect of the invention, the surface of the casing 3 located in the vicinity of the outer peripheral portion 4 c of the bearing portion 4 is arranged at predetermined intervals along the circumferential direction Fc of the outer peripheral portion 4 c of the bearing portion 4. A plurality of the second recesses 5s can be formed.

  According to the bearing device 1 of the rotating shaft according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) The casing 4 is made of a synthetic resin material R so that the bearing 4 has a ring shape having a predetermined thickness Dt with respect to the axial direction Fs and a predetermined ring thickness Dr with respect to the radial direction Fd. 3 and a plurality of tolerance absorbing recesses 5 are formed on the end surface of the bearing portion 4 at predetermined intervals La along the circumferential direction Fc and the bottom portion 5d is selected to have a predetermined thickness Lb. By doing so, since the gap between the tolerance absorbing recess 5 and the inner peripheral surface 4s of the bearing portion 4 is selected to have a predetermined thickness Lc, the synthetic resin material R is used and the casing 3 and the bearing portion 4 are integrally formed. Even in this case, it becomes possible to suppress the deformation of the shape at the time of manufacture (molding) or use to a minimum, and sufficient stability and reliability as a bearing can be secured. In addition, since it has a plurality of tolerance absorbing recesses 5 arranged at predetermined intervals La and the bottom 5d is selected to have a predetermined thickness Lb, thermal expansion and contraction occur due to changes in the temperature environment during use. Even in this case, it becomes possible to absorb these thermal expansion and contraction.

  (2) Since two separately produced bearing parts are not required, only the casing 3 is sufficient for the number of parts. Accordingly, the cost of parts can be reduced, and the process of attaching the bearing parts to the casing 3 becomes unnecessary, and the manufacturing cost can be reduced by reducing the number of assembly steps. In addition, while securing the mechanical strength, various merits associated with using the synthetic resin material R, specifically, various merits such as overall weight reduction, improvement in manufacturability, and material cost reduction effect are obtained. In addition, since a plurality of tolerance absorbing recesses 5 are provided, the total amount of the synthetic resin material R forming the casing 3 and the bearing portion 4 can be reduced, and further weight reduction and material cost reduction can be achieved. Can contribute.

  (3) Since the bearing portion 4 is formed so as to protrude from the surface 3f of the casing 3 in the axial direction Fs so as to have a predetermined thickness Dt with respect to the axial direction Fs, a part 4p of the bearing portion 4 is formed with respect to the casing 3. It can become independent and can be implemented as an optimum form that can obtain a desirable effect as the bearing device 1 according to the present invention.

  (4) Since the thickness Lc between the tolerance absorbing recess 5 and the inner peripheral surface 4s of the bearing portion 4 is selected so as to absorb at least the tolerance of the diameter of the inner peripheral surface 4s based on the synthetic resin material R, For example, even when a synthetic resin material R having a large thermal expansion coefficient is used and a relatively large tolerance is likely to occur, unnecessary tolerances can be effectively absorbed while ensuring mechanical strength.

  (5) Since the present invention is applied to the casing of the rotary solenoid M, the stability and reliability related to the operation of the rotary solenoid M can be further improved, and it is possible to contribute to the reduction of the parts cost and the manufacturing cost in the entire rotary solenoid M.

  (6) As the rotary solenoid M, a position corresponding to one corner P1 in the triangle is fixed to the rotary shaft 2, and the S pole and N are positioned corresponding to the remaining two corners P2 and P3 which are free ends. It has a movable body portion 7 having a magnet portion 7m that can be turned by generating poles, and a single coil 8c that is fixed to the casing 3 and has one coil end face 8s facing the magnet portion 7m. Because the magnetic field portion 8 that makes the body portion 7 attractable or repulsive and the movable body regulating portion 9 that uses the inner wall of the casing 3 that regulates the range in which the movable body portion 7 turns to a predetermined range Zr are provided. The number of independent field parts can be halved, the number of parts can be reduced, the cost of parts can be further reduced, and the cost of manufacturing can be reduced by reducing the number of assembly steps. It can be achieved down. Further, the length of the movable body portion 7 in the direction perpendicular to the axis of the rotary shaft 2 can be shortened, and the field portion 6 is not disposed on both sides of the displacement space of the movable body portion 7, so that the casing 2 is formed in a rectangular parallelepiped shape. Even in this case, rational component placement can be easily performed. As a result, generation of unnecessary dead space can be greatly reduced, and the entire rotary solenoid can be reduced in size and size.

  (7) According to a preferred embodiment, a plurality of a plurality of portions arranged on the surface of the casing 3 located in the vicinity of the outer peripheral portion 4c of the bearing portion 4 at predetermined intervals along the circumferential direction Fc of the outer peripheral portion 4c of the bearing portion 4 If the second recesses 5s are formed, in addition to the tolerance absorbing function based on the tolerance absorbing recesses 5 provided in the bearing portion 4 itself, a synergistic or auxiliary tolerance absorbing function for the entire bearing portion 4 can be added. The overall tolerance absorbing function can be further enhanced.

A front view of a rotary solenoid configured using a bearing device according to a preferred embodiment of the present invention, Sectional side view clearly showing the main part of the bearing device in the rotary solenoid, A perspective view of the rotary solenoid, Rear view of the rotary solenoid, Sectional side view of the rotary solenoid, Sectional front view of the rotary solenoid, An exploded front view of the movable body in the rotary solenoid, Connection diagram of the electrical system when driving the rotary solenoid, Drive explanatory diagram of the rotary solenoid, Another drive explanatory diagram of the rotary solenoid, A front view of a rotary solenoid configured using a bearing device according to a modified embodiment of the present invention, Sectional side view clearly showing the principal part of the bearing device according to a modified embodiment of the present invention,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the structure of the rotary solenoid M provided with the bearing device 1 according to the present embodiment will be described with reference to FIGS.

  The rotary solenoid M includes a casing 3 constituting an outer shell, and the casing 3 includes a casing body 3m and a casing lid 3c that closes an opening of the casing body 3m as shown in FIG. The casing body 3m and the casing lid 3c are integrally formed of a synthetic resin material R excellent in moldability and light weight. In this case, the type of the synthetic resin material R is not limited to a specific type, but a material excellent in dimensional stability and thermal stability (heat resistance), for example, a PBT (polybutylene terephthalate) resin material, etc. Is desirable. In addition, the code | symbols 31 and 32 in FIG. 1 show the leg part for attachment provided in the bottom face of the casing main-body part 3m.

  The casing body 3m is integrally molded with the bearing 4 positioned on the front side, and the casing lid 3c is integrally molded with the bearing 4 positioned on the rear side. That is, the two bearing portions 4 and 4 are integrally formed with the casing 3 (the casing main body portion 3m and the casing lid portion 3c) by the same synthetic resin material R. As a result, a part of the casing body 3m and the bearing part 4 located on the front side, and a part of the casing lid part 3c and the bearing part 4 located on the rear side constitute the bearing device 1 according to this embodiment. .

  In the bearing device 1, one bearing portion 4 located on the front side has a predetermined thickness Dt with respect to the axial direction Fs and a predetermined ring thickness with respect to the radial direction Fd, as shown in FIG. 2. A part 4p in the axial direction Fs of the bearing portion 4 is formed so as to protrude from the surface 3f of the casing 3 in the axial direction Fs. That is, the dimension obtained by adding the portion protruding forward from the surface (front surface) 3f of the casing body 3m and the thickness portion of the casing body 3m is the substantial thickness Dt of the bearing portion 4. Thus, if the part 4p of the axial direction Fs in the bearing part 4 is formed so as to protrude from the surface 3f of the casing 3 in the axial direction Fs, the part 4p of the bearing part 4 can be made independent of the casing 3. Thus, the present invention can be implemented as an optimum mode that can obtain the desired effect as the bearing device 1 according to the present invention. Thereby, the inner peripheral surface 4s in the central circular hole of the bearing portion 4 becomes a bearing surface that rotatably supports the rotary shaft 2 described later.

  Further, as shown in FIGS. 1 and 2, the end surface 4f, which is the outer end surface located on the front side of the bearing portion 4, is arranged at predetermined intervals La along the circumferential direction Fc, and the bottom portion 5d is set to a predetermined value. A plurality of tolerance absorbing recesses 5... Selected for the thickness Lb are formed. The illustration shows an example in which eight substantially rectangular tolerance absorbing recesses 5... Selected in the same shape are formed over the entire circumference. In this case, the predetermined interval La and the thickness Lb of the bottom portion 5d can be arbitrarily selected in consideration of the type of forming material and the shape and size of the recess 5, but basically, the tolerance absorbing recess 5 ... In order to function as a rib for supporting the bearing tube portion 4w formed thin on the inside of the bearing portion 4, it can be selected in consideration of mechanical strength. As an example, when the outer diameter of the bearing portion 4 is about 15 [mm], the predetermined interval La and the thickness Lb of the bottom portion 5d can be selected to be about 0.2 to 1.2 [mm].

  Further, the thickness of the bearing tube portion 4w, that is, the thickness Lc between the tolerance absorbing recess 5 and the inner peripheral surface 4s of the bearing portion 4 is selected to be a predetermined thickness. The thickness Lc is selected so as to absorb at least the tolerance of the diameter of the inner peripheral surface 4s based on the synthetic resin material R. As an example, when the diameter of the bearing portion 4 is about 15 [mm], the ring thickness Lc can be selected to be about 0.5 to 1.5 [mm]. In this way, the thickness Lc between the tolerance absorbing recess 5 and the inner peripheral surface 4s of the bearing portion 4 is selected so as to absorb at least the tolerance of the diameter of the inner peripheral surface 4s based on the synthetic resin material R. For example, even if a synthetic resin material R having a large thermal expansion coefficient is used and a relatively large tolerance is likely to occur, unnecessary tolerances can be effectively absorbed while ensuring mechanical strength.

  Therefore, according to the bearing device 1 having such a configuration, the bearing portion 4 has a ring shape having a predetermined thickness Dt with respect to the axial direction Fs and a predetermined ring thickness Dr with respect to the radial direction Fd. The synthetic resin material R is integrally molded with the casing 3 so as to be arranged at predetermined intervals La along the circumferential direction Fc on the end surface of the bearing portion 4, and the bottom portion 5d is set to a predetermined thickness Lb. Since a plurality of selected tolerance absorbing recesses 5 are formed to select a predetermined thickness Lc between the tolerance absorbing recess 5 and the inner peripheral surface 4s of the bearing portion 4, a synthetic resin material R is used. Even when the casing 3 and the bearing portion 4 are integrally molded, it is possible to minimize shape deformation at the time of manufacturing (molding) and at the time of use, and sufficient stability and reliability as a bearing can be secured. . In addition, since it has a plurality of tolerance absorbing recesses 5 arranged at predetermined intervals La and the bottom 5d is selected to have a predetermined thickness Lb, thermal expansion and contraction occur due to changes in the temperature environment during use. Even in this case, it becomes possible to absorb these thermal expansion and contraction.

  In addition, since two separately manufactured bearing parts are not required, only the casing 3 is sufficient for the substantial number of parts. Accordingly, the cost of parts can be reduced, and the process of attaching the bearing parts to the casing 3 becomes unnecessary, and the manufacturing cost can be reduced by reducing the number of assembly steps. In addition, while securing the mechanical strength, various merits associated with using the synthetic resin material R, specifically, various merits such as overall weight reduction, improvement in manufacturability, and material cost reduction effect are obtained. In addition, since a plurality of tolerance absorbing recesses 5 are provided, the total amount of the synthetic resin material R forming the casing 3 and the bearing portion 4 can be reduced, and further weight reduction and material cost reduction can be achieved. Can contribute.

  On the other hand, as shown in FIGS. 1 and 2, the circumferential direction Fc of the outer peripheral portion 4 c of the bearing portion 4 is also applied to the surface (outer surface 3 f) of the casing main body portion 3 m located in the vicinity of the outer peripheral portion 4 c of the bearing portion 4. A plurality of second recesses 5s arranged at predetermined intervals are formed. In the case of illustration, the eight substantially rectangular second recesses 5s... Selected in the same shape are formed in a range excluding about 1/3 of the upper end portion in the entire circumference. The second recess 5s can also be formed in the same manner as the tolerance absorbing recess 5 described above, that is, with a dimension according to the tolerance absorbing recess 5. The interval between the second recesses 5 s... And the thickness of the bottom 5 sd in the second recess 5 s can be arbitrarily selected depending on the type of forming material, the shape and size of the recess 5, and the like. If such second recesses 5 s are formed, in addition to the tolerance absorbing function based on the tolerance absorbing recesses 5 provided in the bearing portion 4 itself, a synergistic or auxiliary tolerance absorbing function for the entire bearing portion 4 is provided. Since it can be added, the overall tolerance absorbing function can be further enhanced.

  Although the case where the bearing part 4 is provided in the casing main body part 3m has been described above, even when the bearing part 4 is provided in the casing lid part 3c, it can be basically configured in the same manner as the casing main body part 3m side. . FIG. 4 shows an outer surface of the casing lid portion 3 c that is the back side of the casing 3. In the case of the example, on the casing lid portion 3c side, two second recesses 5s formed in a circular shape as the second recesses 5s are included, in which the positions of the tolerance absorbing recesses 5 in the circumferential direction Fc are different. The bearing portion 4 on the casing lid portion 3c side is configured in the same manner as the casing body portion 3m side except that the bearing portion 4 on the casing body portion 3m side is symmetrical with respect to the bearing portion 4 on the casing body portion 3m side.

  On the other hand, the configuration other than the casing 3 including the bearing device 1 is as follows. Reference numeral 2 denotes a round bar-shaped rotating shaft (output shaft) formed of a magnetic material. The pair of bearings 4 and 4 are arranged at a position biased to one side (upper side) of the casing body 3m and the casing lid 3c. It is supported rotatably. Therefore, as the positions of the bearing portions 4 and 4 formed integrally with the casing main body 3m and the casing lid 3c, as shown in FIGS. 1 and 4, a position biased upward is selected.

  The movable body portion 7 is fixed at a position on the inner side of the casing 3 in the rotary shaft 2. The movable body portion 7 has a holding block portion 11 formed of a nonmagnetic material such as a synthetic resin material. As shown in FIG. 6, the holding block portion 11 (movable body portion 7) has a substantially triangular shape when viewed from the front. Therefore, the rotating shaft 2 is fixed at a position corresponding to one corner portion P <b> 1 in the triangle, A magnet portion 7 m is disposed on the other end side 7 s of the movable body portion 7. Therefore, an S pole and an N pole are generated by the magnet portion 7m at positions P2 and P3 corresponding to the remaining two corners in the triangle, respectively. Thereby, since the movable body part 7 (holding block part 11) has one end side 7c fixed to the rotating shaft 2 and the other end side 7s becomes a free end, it can turn around the rotating shaft 2 as a fulcrum.

  In this case, the holding block portion 11 holds the magnet portion 7m by covering. That is, as shown in FIG. 7, the holding block portion 11 is constituted by a holding block main body portion 11b and a holding block cover portion 11c attached to the holding block main body portion 11b, and a magnet is formed in a recess formed in the holding block main body portion 11b. The portion 7m is accommodated and held by a holding block cover portion 11c attached to the holding block main body portion 11b. At this time, the magnet portion 7m may be entirely covered with the holding block portion 11, but as illustrated, a field portion 8 described later on the other end side 7s of the holding block portion 11 (movable body portion 7). It is desirable to form an opening 11s in at least a part of the facing surface that faces the at least a part of the magnet part 7m. Specifically, the entire holding block cover portion 11c is formed in a rectangular frame shape, and a pair of holding band portions 11cb and 11cb are integrally formed in the frame. As a result, as shown in FIG. 8, the air gap Ga between the magnet portion 7m and the field portion 8 can be set to a minimum, and therefore there is an advantage that the magnetic characteristics of the magnet portion 7m can be utilized to the maximum.

  Further, the magnet portion 7m is formed in an elongated flat rectangular parallelepiped shape, and thus a set of a magnet 7ma having a south pole and a north pole respectively magnetized on both sides in the longitudinal direction and a back yoke 7my disposed on the back side of the magnet 7ma. Configured by combination. The magnet portion 7m may be configured by combining the magnet 7ma and the back yoke 7my as described above, or only the magnet portion 7m may be used alone. When the magnet portion 7m is used alone, the holding block portion 11 can be formed of a magnetic material. As described above, the magnet portion 7m may be a single magnet 7ma, or may be configured by a combination of the magnet 7ma and the back yoke 7my. The degree of freedom can be increased.

  On the other hand, as shown in FIGS. 5 and 6, a field portion 8 having a single coil 8 c is disposed inside the casing 3. In this case, the single coil 8c is arranged with one end face 8s facing the magnet portion 7m (magnet 7ma). In the illustrated example, the field magnet 8 is provided with an E-shaped yoke 12 into which the single coil 8c is loaded. Thereby, since the magnetic circuit by the E-shaped yoke 12 is comprised, it can contribute to the high efficiency and high performance of the rotary solenoid M. Reference numeral 21 denotes a coil bobbin formed of an insulating material such as plastic and wound with a single coil 8c.

  Furthermore, a movable body restricting portion 9 for restricting the turning range of the magnet portion 7m to a predetermined range Zr is provided inside the casing 3. The illustrated movable body restricting portion 9 includes a pair of restricting wall surface portions 3p and 3q formed on the inner wall of the casing 3 and a holding block portion 11 so that the movable member restricting portion 9 is in contact with the restricting wall surface portions 3p and 3q to be position restricted. It is comprised by the regulation surface parts 11p and 11q. If such a movable body restricting portion 9 is provided, the inner wall of the casing 3 and a part of the holding block portion 11 can be used as the movable body restricting portion 9, further simplifying the overall structure, reducing costs, There is an advantage that can contribute to size reduction.

  Therefore, since the rotary solenoid M configured as described above includes the bearing device 1 according to the present embodiment, the stability and reliability related to the operation of the rotary solenoid M can be further improved, and components in the entire rotary solenoid M can be obtained. This can contribute to cost and manufacturing cost reduction. In particular, the illustrated rotary solenoid M has a position corresponding to one corner P1 in the triangle fixed to the rotary shaft 2 and an S pole at a position corresponding to the remaining two corners P2 and P3 which are free ends. It has a movable body portion 7 having a magnet portion 7m that can turn by generating N poles, and a single coil 8c that is fixed to the casing 3 and has one coil end face 8s facing the magnet portion 7m. Since the movable body portion 7 is configured to include the field portion 8 that can attract or repel the movable body portion 7 and the movable body restriction portion 9 that restricts the range in which the movable body portion 7 turns to a predetermined range Zr, The number of parts can be halved, and the cost for further parts costs can be reduced by reducing the number of parts, and the cost for manufacturing costs can be reduced by reducing the number of assembly steps.Further, the length of the movable body portion 7 in the direction perpendicular to the axis of the rotary shaft 2 can be shortened, and the field portion 6 is not disposed on both sides of the displacement space of the movable body portion 7, so that the casing 2 is formed in a rectangular parallelepiped shape. Even in this case, rational component placement can be easily performed. As a result, generation of unnecessary dead space can be greatly reduced, and the entire rotary solenoid can be reduced in size and size.

  Next, the usage method and operation | movement of the rotary solenoid M are demonstrated with reference to FIGS.

  FIG. 8 shows a drive circuit E of the rotary solenoid M. The drive circuit E supplies power to or feeds a pair of connection leads 13a and 13b derived from the single coil 8c, and a DC voltage supplied from the DC source 41 to the connection leads 13a and 13b. There is provided an operation switch 42 for stopping and switching the polarity for inverting the polarity of the DC voltage.

  When the rotary solenoid M is used, as shown in FIG. 8, the drive circuit E is connected to the connection leads 13a and 13b of the single coil 8c. FIG. 8 shows a state in which the operation switch 42 is switched to the power supply position. Therefore, power is supplied to the single coil 8c, and the S pole and the N pole shown in FIG. The polarities (S pole and N pole) of the magnet 7ma are as shown in FIG. As a result, the S pole side of the magnet 7ma is attracted to the N pole side of the E-shaped yoke 12, and the N pole side of the magnet 7ma is repelled with respect to the N pole side of the E-shaped yoke 12. As a result, the rotary shaft 2 is rotated and displaced in the clockwise direction in the direction of the arrow Fc shown in FIG. 10, and the movable body portion 7 has the regulated surface portion 11q of the movable body portion 7 abutted against the regulation wall surface portion 3q of the casing 3. It stops at the position shown in FIG.

  On the other hand, it is assumed that the operation switch 42 is switched to the power supply stop position from this state. In this case, as shown in FIG. 9, the magnetic field portion 8 does not generate its own magnetic pole based on power feeding. However, since the magnetic field by the magnet 7ma is maintained, the position of the movable body portion 7 is held by the magnetic circuit formed by the magnet 7ma and the E-shaped yoke 12. A dotted line Jm shown in FIG. 9 indicates magnetic lines of force passing through the magnetic circuit when power feeding is stopped.

  On the other hand, it is assumed that the operation switch 42 is switched from this state to an inversion feed position in which the polarity is inverted. In this case, as shown in FIG. 10, the S-pole and the N-pole reversed with respect to the polarity shown in FIG. As a result, the N pole side of the magnet 7ma is attracted to the S pole side of the E-shaped yoke 12, and the S pole side of the magnet 7ma repels against the S pole side of the E-shaped yoke 12. As a result, the rotary shaft 2 is rotationally displaced counterclockwise in the direction of the arrow Fc shown in FIG. 10, and the movable body portion 7 has the regulated surface portion 11p of the movable body portion 7 at the regulation wall surface portion 3p of the casing 3. It stops at the position shown in FIG. Dotted lines Jp and Jq shown in FIG. 10 indicate magnetic lines of force that pass through the magnetic circuit during power feeding. At this time, an angular range in which the rotary shaft 2 is rotationally displaced is a predetermined range Zr shown in FIG.

  Next, the bearing apparatus 1 which concerns on the modified embodiment of this invention is demonstrated with reference to FIG.11 and FIG.12.

  In the modified embodiment shown in FIG. 11, in addition to the above-described tolerance absorbing recesses 5... And second recesses 5 s in the casing 3, additional auxiliary recesses are provided in parts other than the tolerance absorbing recesses 5. 5e ... are provided. The auxiliary recesses 5e can be basically formed in the same manner as the tolerance absorbing recesses 5 ... and the second recesses 5s. The auxiliary recesses 5e are provided at a position away from the bearing portion 4. Therefore, even if it has a tolerance absorbing function similar to that of the auxiliary recesses 5e, the function (action) is relatively small, and the effects such as overall weight reduction and material cost reduction are relatively large. The auxiliary recesses 5e can be formed by selecting an arbitrary position, quantity, shape and the like. FIG. 11 shows the casing body 3m side, but the casing lid 3c side can be similarly configured.

  FIG. 12 shows a change in the formation surface (formation site) for forming the tolerance absorbing recesses 5... And the second recesses 5 s. In the embodiment shown in FIG. 2, when the tolerance absorbing recesses 5 are provided, the case is formed on the end surface 4 f that is the outer surface portion of the bearing portion 4, but FIG. 12 is an end surface that is the inner surface portion of the bearing portion 4. The case where it forms in 4i is shown. In the embodiment shown in FIG. 2, when the second recesses 5 s are provided, the case is formed on the outer surface 3 f of the casing 3, but FIG. 12 shows the outer surface 3 f and the inner surface of the casing 3. The case where it forms in both of the surfaces 3i is shown. Accordingly, the bottom 5sd is provided at an intermediate position between the two front and rear second recesses 5s and 5s. Thus, when forming the tolerance absorbing recesses 5..., The second recesses 5 s... And the auxiliary recesses 5 e..., Various forms such as use as an external design or conversely avoiding exposure are provided. It can be selected and implemented.

  The preferred embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, and the like are within the scope not departing from the gist of the present invention. , Can be changed, added and deleted arbitrarily.

  For example, although the embodiment has shown the case where the second recesses 5s and the auxiliary recesses 5e are provided, the second recesses 5s and the auxiliary recesses 5e are not necessarily provided and can be provided if necessary. . The rotary solenoid M is not limited to the illustrated configuration, and can be applied to various rotary solenoids adopting various principles.

  The rotating shaft bearing device according to the present invention can be used for various devices such as the illustrated rotary solenoid and the rotary motor including the rotating shaft.

  DESCRIPTION OF SYMBOLS 1: Bearing apparatus, 2: Rotating shaft, 3: Casing, 3f: Casing surface, 4: Bearing part, 4s: Inner peripheral surface of a bearing part, 4p: A part of axial direction of a bearing part, 5 ...: Tolerance absorption Concave part, 5d: bottom part, 5s ...: second concave part, 7: movable part, 7m: magnet part, 8: field part, 8s: coil end face, 8c: single coil, 9: movable part regulating part, Fs: Axial direction, Fd: radial direction, Fc: circumferential direction, Dt: predetermined thickness, Dr: ring thickness, R: synthetic resin material, La: first dimension, Lb: second dimension, Lc: third dimension, M : Rotary solenoid, P1: Corner, P2: Corner, P3: Corner, Zr: Predetermined range

Claims (2)

  In a rotary shaft bearing device including a bearing portion located on the front side and a bearing portion located on the rear side provided in a casing of a rotary solenoid that rotatably supports the rotary shaft, the position corresponding to one corner in the triangle is A movable body portion having a magnet portion that can be rotated by generating a south pole and a north pole at positions corresponding to the remaining two corner portions that are free ends, and fixed to the rotating shaft, and fixed to the casing. A field coil section that has a single coil with its coil end face facing the magnet section, and that allows the movable body section to be attracted or repelled by power supply control, and a range in which the movable body section turns within a predetermined range And a movable body restricting portion using an inner wall of the casing to be regulated to constitute a rotary solenoid, and the bearing portion has a predetermined thickness with respect to the axial direction. It is integrally formed with the casing by a synthetic resin material so as to project in the axial direction from the surface of the casing and have a predetermined ring thickness with respect to the radial direction. A plurality of tolerance absorbing recesses that absorb thermal expansion and contraction are formed by arranging them at predetermined intervals along the direction and selecting the bottom portion to a predetermined thickness. A bearing device for a rotary shaft, wherein a gap between the inner peripheral surfaces is selected to a predetermined thickness that absorbs at least a tolerance of a diameter dimension of the inner peripheral surface based on the synthetic resin material.   A plurality of second concave portions arranged at predetermined intervals along the circumferential direction of the outer peripheral portion of the bearing portion are formed on the surface of the casing located in the vicinity of the outer peripheral portion of the bearing portion. Item 6. A bearing device for a rotating shaft according to Item 1.

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