• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A dental handpiece power generator is subjected to a high pressure steam sterilization process (e.g., 135 ° C, vapor pressure: 2 atm) in a state of being integrated in the dental handpiece. In order to withstand the high-pressure steam sterilization process, the power generator according to the embodiment achieves an improvement in corrosion resistance through the use of a coil covered with AlW (polyamide-imide copper wire), and also achieves an improvement in corrosion resistance by filling with silicone-based resin has a high adhesiveness to a cylindrical body portion consisting of a thermoplastic member, and by wrapping the coil with the resin and the cylindrical body portion.
    公开号:AT512093A2
    申请号:T1061/2012
    申请日:2012-10-01
    公开日:2013-05-15
    发明作者:Yoshibumi Nakamura；Takashi Fujine；Shin Takagi
    申请人:Seiko Instr Inc；Nakanishi Inc；
    IPC主号:
    专利说明:

    1
    BACKGROUND OF THE INVENTION 1. Field of the Invention
    The present invention relates to a power generator used for a dental handpiece to be subjected to high pressure steam sterilization. 2. General state of the art
    Coils are used in motors and power generators.
    Examples of covering materials of the coils, which are mass-produced and widely used as inexpensive covering materials, include a UEW (polyurethane enameled wire), a PEW {polyester enameled wire), and a PESVW (wire formed by thermally curing a polyester-based resin) In general, these materials are fired on copper wires to cover these.
    The power generators, etc., using the UEW, PEW, etc., do not particularly suffer from performance degradation, even in an atmosphere of generally high temperatures.
    For example, even if the power generator using the UEW is immersed in hot water at 100 ° C for a while, there will be no problem of power deterioration of the power generator. Even if such a power generator is exposed to air (atmosphere) at a temperature of 135 ° C or more, no performance degradation occurs.
    In the medical field, however, recently used tools have been subjected to disinfecting sterilization to prevent infection by various types of pathogens in the patients. As a method of disinfecting 2 ...... ··;
    Sterilization ki.uptS'äctilicji is a high-pressure ···········> > ≪ ···
    Steam sterilization process {pressure vessel: 135 ° C, vapor pressure: 2 atm).
    Although the power generator using a UEW or the like does not suffer from performance degradation even when immersed in hot water at high temperatures or exposed to high temperatures and high pressures as described above, a new problem has been found to occur such a .Energieerzeuger is impaired performance when it is subjected to the high-pressure steam sterilization process.
    In particular, the deterioration of performance includes deterioration such as hydrolysis of the covering material of the UEW and the like, and the reduction of the coil resistance value caused thereby.
    In order to cope with the problem of high-temperature steam sterilization, it is considered to add an inorganic substance to the covering material in order to overcome the problem
    Corrosion resistance or the use of a covered copper wire produced by covering, as described in JP-A-2002-222616, copper formed with a ceramic insulating film and a melt film on the surface of an electric wire.
    However, the covering material of the electric wire disclosed in JP-A-2002-222616 is too thick, and therefore, the characteristics of the power generator can not be sufficiently satisfied although the corrosion resistance is provided.
    BRIEF SUMMARY OF THE INVENTION
    Accordingly, it is an object of the invention to provide a power generator for a dental handpiece that will withstand performance degradation, even if it interferes with performance. *** ""
    High-pressure steam steriliLiaWoa'Sprtizess is subjected.
    According to a first aspect of the invention, there is provided a power generator for a dental handpiece to be used for treatment and subjected to a high pressure steam sterilization comprising: a rotating shaft; a permanent magnet fixed to the shaft and having a plurality of magnetic poles arranged in a circumferential direction on an outer edge thereof; a Spuleneinbauelement having a cylindrical body portion in a position opposite to the permanent magnet across an air gap; an outer member constituting a cylindrical storage portion by being adhered to the coil installation member; a spool attached to an outer edge portion of the cylindrical body portion in the storage portion; a yoke disposed on an inner peripheral side of the outer member to face the spool in the storage portion; and a resin filled in the storage portion within a range covering at least the coil fixed to the coil insertion member and a peripheral edge thereof, the coil being formed of a polyamide-imide-copper wire or a polyimide-copper wire.
    Preferably, the resin to be filled in the storage portion is a silicone-based resin.
    Preferably, the resin is filled to cover a joint portion between the coil installation member and the outer member.
    Preferably, the joint surfaces of the coil installing member and the outer member are joined together to be oriented in a radial direction of the cylindrical body portion.
    Preferably, there is further provided an energy generating turbine blade fixed to the rotary shaft. 4 * *
    According to the invention, for a dental handpiece, it is possible to maintain long term high pressure steam sterilization process performance by using an AIW or PIW on the spool.
    The dental or medical handpiece according to the invention has a high energy efficiency, because the above-described rotary electric machine is provided and thus the illuminance of a light-emitting component of the handpiece can be increased. In addition, a cost reduction of the handpiece itself is achieved.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Show it:
    1 is a cross-sectional view of a power generator for a dental handpiece according to a first embodiment;
    Figs. 2A to 2C are explanatory drawings showing embodiments of cylindrical coils;
    Figs. 3A to 3D are explanatory drawings showing respective processes for manufacturing a cylindrical coil having a hexagonal winding pattern;
    4 is a cross-sectional view showing a change of the power generator for a dental handpiece according to the first embodiment;
    Fig. 5 is a cross-sectional view of the dental handpiece incorporating the power generator for a dental handpiece;
    6 is a cross-sectional view of the power generator for a dental handpiece according to a second embodiment;
    7 shows a perspective view of a state in which a ·· 11 ·· · * ·· ·· * «·« ·
    Yoke, on which a coil is wound, is disposed on a reel mounting member according to the second embodiment; · and
    8A and 8B are explanatory drawings showing the measurement results of Examples 1 and 2 and Comparative Examples 1 to 4.
    DESCRIPTION OF THE PREFERRED EMBODIMENTS
    Preferred embodiments of a power generator used in a dental handpiece according to the present invention will be described in detail with reference to FIGS. 1 to 8. {1) Brief description of the embodiment
    The power generator of one embodiment generates power by rotating an energy generating turbine mounted on a rotating shaft of the power generator using air for rotating a dental treatment tool as a driving force. The energy generated is supplied to instruments necessary for dental treatment, such as an LED for illumination.
    The power generator for a dental handpiece according to the embodiment is subjected to a high-pressure steam sterilization process (for example, at 135 ° C, vapor pressure: 2 atm) in a state of being integrated in the dental handpiece.
    In order to endure the high-pressure steam sterilization process, the power generator according to the embodiment achieves an improvement in corrosion resistance by using a coil covered with an AIW (polyamideimide copper wire), and also achieves an improvement in corrosion resistance by filling a silicone-based resin which has a high adhesiveness to a cylindrical body portion formed of a thermoplastic member, "*. by wrapping the spool in the cylindrical part of the body.
    In particular, the following configuration is used as a power generator having a coil material and a structure capable of maintaining durability and high-quality properties with respect to disinfecting sterilization in the high-pressure steam sterilization process. <a) As the coil cover material, an AIW or a PIW (polyimide copper wire) having no deterioration of the cover is used.
    The AIW is known in the relevant technology as a motor coil which resists high temperatures. Other features are not known.
    From experiments with various materials that withstand the high pressure steam sterilization process, it has been found that the AIW has not only a high temperature resistance property but also a high pressure steam resistance property. Accordingly, in the embodiment, the AIW or the PIW is used as a coil for a power generator 40 for a dental handpiece. (b) The coil or the like is protected from the high pressure steam by the spaces of the coil and the gaps defined between the components such as a stator or a yoke material. a silicone-based resin. The silicone-based resin has a high adhesiveness and thus is capable of adequately protecting the coil or the like. (c) Thermoplastic resins formed of an insulating material, for example, a heat-resistant resin (softening temperature: 200 ° C. or more), such as a PPS (polyphenylene sulfide resin), LCP-7 + · »··· »« (Liquid Crystal Polymers) * for the PgEi £ - (polyetheretherketone) material, used for the cylindrical body portion (inner housing) to be placed between the coil and a magnet for effective rotation. (2) Detailed description of an embodiment
    Fig. 1 is a configuration drawing of a power generator 40 for a dental handpiece according to a first embodiment.
    A shaft 46 is disposed in the center of a cylindrical shaft of the dental handpiece power generator 40, and the shaft 46 is rotatably supported by bearings 47 and 48 functioning as radial bearings.
    The bearing 48 is held by a bearing holding member 54, and the bearing 47 is held by a bearing holding member 53.
    The bearing 48 and the bearing 47 are preferably not influenced by the magnetic flux of a permanent magnet.
    Although in the embodiment, an oil storage bearing comprising, for example, copper as a main component is used, a ball bearing or the like may be used.
    A permanent magnet 45 is rotatably provided on an outer peripheral surface of the shaft 46 between the bearing 48 and the bearing 47 together with the shaft 46.
    The permanent magnet 45 according to the embodiment is a sintered Sm-Co anisotropic magnet polarized at two poles.
    However, a Nd-Fe-B magnet may be used as the permanent magnet 45. The permanent magnet 45 may be a bonded magnet instead of a sintered magnet. The permanent magnet 45 may also be an isotropic magnet. The permanent magnet 45 may also have two or more poles. 8th ······*·*
    A coil installation element. 42 is concentric with the shaft 4 6 with * &quot; ·····································································.
    The bobbin fitting member 42 includes a cylindrical body portion 42a open at both ends and an outwardly extending annular portion 42b integrally formed to extend outward from an end of the cylindrical body portion 42a.
    The thermoplastic resins constituting the insulating material, for example, the heat-resistant resin (softening temperature: 200 ° C or more) such as PPS (polyphenylene sulfide resin), LCP (liquid crystal polymer) or PEEK (polyether ether ketone) material are referred to as Coil installation element 42 is used. The PPS containing 40% GF (glass fibers) is used for the coil installing member 42 according to the embodiment.
    The thickness of the cylindrical body portion 42a should preferably ensure the strength and be small, and is preferably, for example, 0.3 mm. However, the thickness of the cylindrical body portion 42a is not limited thereto, and the thickness may range from 0.1 mm to 0.5 mm inclusive.
    In this case, the coil insertion member 42 (an outer member 50 described later is also configured) is preferably formed of a resin having an elastic flexural modulus of 5000 MPa or more. Forming the coil installing member 42 made of a resin as described above is useful for preventing current leakage, and the use of the elastic bending modulus of 5000 MPa or more is useful for preventing deformation during processing, and thereby processing with a high degree of accuracy to a thin profile allows. Thus, a compact and lightweight rotary electric machine is achieved. 9
    The outwardly extending annular armature 2b of the coil insertion element 42 is provided with two terminal pins 49 configured to deliver the energy generated by the dental handpiece power generator 40 to enter the penetrate outwardly extending annular portion 42b.
    The lead wires of a field magnet coil (a cylindrical coil 44 in the embodiment) are attached to one end of each of the terminal pins 49 on the side of the cylindrical body portion 42a.
    The outwardly extending annular portion 42 b is formed with a through hole to be filled with resin as described below in addition to the through holes for the pin 49.
    The bearing holding member 54 is fitted in one end side of the spool installing member 42, and the bearing holding member 53 is fitted in the other end side thereof where the outwardly extending annular portion 42b is located.
    The bearing support member 54 is formed with a recess in its center, and the bearing 48 is fixed in the recess.
    The recess is formed with a through hole having a diameter larger than the diameter of the shaft 46 at its center, and the shaft 46 penetrates into this through hole and the bearing 48. In Fig. 1, the recess in which the bearing 48 is fixed, formed on the side of the permanent magnet 45 of the bearing support member 54. However, the recess may be formed on the opposite side thereof.
    The bearing holding member 53 is formed with a recess in its center on the side of the permanent magnet 45, and the bearing 47 is fixed in the recess. The recess is further formed with a second recess on its bottom, and a bearing ball 10 formed of ceramics and serving as a pressure bearing is disposed in the second recess and one end of the shaft 4 6 is applied to the bearing ball.
    In Fig. 1, the bearings 48 and 47 are fixed to the Spuleneinbauelement 42 respectively via the bearing support members 54 and 53. However, the bearings 48 and 47 may be directly attached to an inner peripheral surface of the - Spuleneinbauelements 42. In this case, the outer shapes of the bearings 48 and 47 are increased to match the inner diameter of the coil fitting 42, or the thickness of the coil fitting 42 at both ends is increased to match the outer shapes of the bearings 48 and 47 ,
    The cylindrical coil 44 is wound on and fixed to an outer peripheral surface of the cylindrical body portion 42 a of the coil installing member 42, in a region where an inner peripheral surface thereof faces the permanent magnet 45. One end of the cylindrical coil 44 is connected to the terminal pins 49.
    The cylindrical coil 44 of the embodiment uses the AIW (polyamide-imide-copper wire) or the PIW (polyimide-copper wire) which has no deterioration of the cover.
    In this way, in the embodiment, deterioration of the performance can be prevented even when the high-pressure steam sterilization process is performed by using the AIW or the PIW as a coil in the power generator 40 for a dental handpiece.
    Figs. 2A to 2C are drawings showing the cylindrical coil 44 to be used in the embodiment.
    The cylindrical coil 44 is a coil that is formed by arranging winding wires each forming a polygonal shaped circuit formed in a cylindrical shape 11 ······ * · · φ »« · «« «· · * The cylindrical coil 44 having a winding in a hexagonal pattern shown in Fig. 2A, a cylindrical coil 44b having a winding, is arranged in approximately three ways in a diamond pattern shown in Fig. 2B and a cylindrical coil 44c having a coil in a honeycomb pattern shown in Fig. 2C.
    The winding having a hexagonal pattern is formed of self-welded winding wire, and the adjacent parts of the cover of the winding wire are welded by heat or the like and fixed together. Since portions of the winding wire are aligned on the cylindrical shaft, in the hexagonal pattern winding, there are linear conductive portions in the direction of the cylindrical shaft, which contribute to generation of torque in a central portion of the cylindrical winding wire, so that a force generated by the magnetic pole is absorbed, effectively up to an operating torque works. Therefore, it is considered that the hexagonal pattern winding is the most effective of the three types of winding.
    In contrast, the rhombic pattern winding has no linear conductive portions in the direction of the cylindrical shaft contributing to the torque and forms a generally inclined conductive portion, so that the efficiency of the winding wire is less than the hexagonal pattern winding. Therefore, the diamond pattern winding is not a particularly desirable winding method with respect to increasing the efficiency.
    Also, the honeycomb pattern winding does not have a linear conductive portion in the direction of the cylindrical shaft contributing to the torque, as well as the diamond-shaped pattern winding, and has a lower efficiency of the winding wire as compared with the hexagonal-type winding. 12 * ·· «· · · ·
    For the reasons described above, the cylindrical coil 44 of the hexagonal pattern winding in the embodiment is used. However, the cylindrical coil of the diamond pattern winding or the honeycomb pattern winding may also be used.
    Figs. 3A to 3D show a method of forming the cylindrical coil 44 having the hexagonal pattern winding.
    The cylindrical coil 44 having the hexagonal pattern winding is formed by a winding process, a flat forming process, a crimping process and an annealing process.
    First, in the winding operation, as shown in Fig. 3A, a winding wire 62 is wound up cleanly on a hexagonal winding frame 61 and, in the state in which it is wound on the winding frame 61, is provisionally fastened with a tape 63 to prevent that the wound wire deforms. In this state, the wound wire is detached from the hexagonal winding frame 61.
    In the flat-forming operation, as shown in Fig. 3B, a pair of opposite surfaces of the hexagon of the winding wire 62, which has been removed from the winding frame 61, brought down in the direction of the axis of the winding frame to achieve a flat plate shape.
    In the crimping operation, as shown in Fig. 3C, the winding wire formed into a flat plate shape is wound around a crimping rod 64. Then, a tape is wound around an outer edge of the crimped winding wire.
    In the annealing process, as shown in FIG. 3D, after the crimping rod 64 has been removed, a cylindrical spool 65 is heated and is designed to achieve a good cylindrical shape by pressing the cylindrical spool 65 into a cylindrical forming device 66. Since the self-fusing wire is used as a winding wire, the adjacent parts weld together to create any loss of shape.
    In the above-described process, the cylindrical coil 44 of the hexagonal pattern winding is formed, and the cylindrical coil 44 is inserted into the cylindrical body portion 42a of the coil installing member 42.
    In the cylindrical bobbin 44 of the embodiment, it is also possible to omit the above-described curling operation and the annealing operation in which the winding wire wound on the polygonal winding frame in the winding operation is formed in a flat shape in the flat forming operation toward the axis of the winding frame and then the flat-shaped winding wire is wound directly on the outer peripheral surface of the cylindrical body portion 42a of the cylindrical body portion 42 to be formed into a cylindrical shape.
    Accordingly, the cylindrical body portion 42a and the cylindrical coil 44 can be brought into closer contact with each other, and therefore, the gap is reduced as compared with the case where the cylindrical coil 44 previously brought into the cylindrical shape by the crimping operation and the annealing operation was inserted into the cylindrical body portion 42 a of the Spuleneinbauelements 42. Further, since the coil is formed along the line of the cylindrical shape of the cylindrical body portion 42a, the cylindrical shape of the coil can be formed with high accuracy, so that the gap between the outer peripheral surface of the cylindrical body portion 42a and a yoke 43 described below is made small can be.
    Accordingly, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and therefore, an improvement in the energy efficiency of the rotary electric machine is achieved. In addition one can partake of the trouble of
    Processing of the cylindrical coil 44 Spai'änVfli ^ 'gfe'was unusually expensive and impaired the processability.
    Returning to FIG. 1, the yoke 43 is disposed at a position opposite to the outer periphery of the cylindrical coil 44 so as to surround the entire outer periphery of the cylindrical coil 44.
    The yoke 43 is configured to magnetically connect the magnetic poles of the permanent magnet 45, and includes a plurality of thin magnetic plates (for example, 34 plates), such as electromagnetic steel plates or silicon steel plates formed in an annular shape (rim shape), and stacked on top of each other. The yoke 43 may for example be formed of a magnetic material in the form of a single steel block.
    The outer member 50 (outer case) is disposed on an outer peripheral side of the yoke 43 concentric with the shaft 46.
    The outer member 50 includes a cylindrical body portion 50a open at both ends, and an inwardly extending annular portion 50b integrally formed at an end portion of the cylindrical body portion 50a (at an end portion on the side opposite to the side) which outwardly extending annular portion 42b of the Spuleneinbauelements 42 is arranged) to extend from the cylindrical body portion 50a inwardly.
    The diameter of the cylindrical body portion 50a of the outer member 50 shown in FIG. 1 is formed so as to be smaller than an area on a surface on the side of the inwardly extending annular portion 50b on which the yoke 43 is not disposed. on which the yoke 43 is arranged. However, the diameter of the cylindrical body portion 50a of the outer member 50 may also be 15 ····· * * * · · · · · · · · · · · · · ······························. have to be of the same length as each other.
    The outer member 50 and the coil fitting member 42 are bonded together at both ends thereof with an adhesive agent or the like, so that a cylindrical receiving portion is formed between the two members. In the cylindrical receiving portion, the cylindrical coil 44 wound on an outer periphery of the coil fitting member 42 has portions of the terminal pins 49 penetrated in the outwardly extending annular portion 42b and the yoke 43 formed on an inner peripheral surface of the outer member 50 is fixed with the adhesive or the like.
    In addition, the entire portion of the inside of the cylindrical receiving portion is filled with a resin injected from a through hole to fill in resin formed on the outwardly extending annular portion 42b. With this resin, the gaps formed between respective constituents, such as between the cylindrical coil 44 and the yoke inside the cylindrical accommodating portion, are filled.
    As the resin to be filled between the outer member 50 and the coil installing member 42, the silicone-based resin is used like a resin having high adhesiveness to the coil insertion member 42 formed of PPS or the like.
    Accordingly, the coil installing member 42 and the silicone-based resin come into strong contact with each other and wrap the cylindrical coil 44, so that a direct contact state of the high-pressure steam with the coil during the high-pressure steam sterilization process is avoided, and the corrosion resistance improves. 16 * t * · # «» · I I * * * t * *
    • l l * * ♦ II
    Further, like a front joint portion 41a, an outer joint portion 41b circled in FIG. 1, the outer member 50 and the coil fitting 42 are joined so that the two joint surfaces are oriented in the radial direction.
    In other words, an inner surface (the side of the outwardly extending annular portion 42b) of the end portion of the inwardly extending annular portion 50b on the side of the shaft 46 and an end surface at an end portion of the cylindrical body portion 42a of the coil fitting member 42, to which the outwardly extending annular portion 42b is not formed is joined to the front joint portion 41a.
    On the other hand, an inner surface (the side of the inwardly extending annular portion 50b) of a radially outer end portion of the outwardly extending annular portion 42b and an end surface at an end portion of the cylindrical body portion 50a of the outer member 50 become inward extending annular portion 50b is not formed, joined together at the rear joint portion 41b.
    By causing the joined surface between the outer member 50 and the coil fitting member 42 to be oriented in the radial direction instead of the axial direction, entry of the high pressure steam into the cylindrical receiving portion during the high pressure steam sterilization process is counteracted.
    Also, by using a heat-resistant resin such as PPS, LCP and PEEK, which is the same material as that of the coil installing member 42, as the material of the outer member 50, higher adhesiveness to the silicone-based resin filling the interior is achieved. so that the entry of the high-pressure steam is further counteracted. 17
    The dental appliance power generator 40, configured as described above, is provided with a power generating turbine blade at a portion projecting from the bearing support member 54 of the shaft 46.
    Then, the dental handpiece power generator 40 is disposed such that the power generating turbine blade is located at a center of an air supply passage to rotate the treatment tool of the dental handpiece.
    Accordingly, the air rotates the power generating turbine blade and the shaft 46, and the permanent magnet 45 provided on the outer peripheral surface of the shaft 46 integrally rotates with the shaft 46, causes the cylindrical coil 44 to generate inductive voltage, and outputs the generated inductive voltage at the pins 49.
    4 is a cross-sectional view showing a change of the power generator 40 for a dental handpiece.
    The dental handpiece power generator 40 according to this modification includes the power generating turbine blade integrated therein, and thereby facilitates the installation of the power generator 40 of a dental handpiece into the dental handpiece as such.
    For information, in the dental handpiece power generator 40 according to this modification, the same parts as in the dental handpiece power generator 40 described in connection with Fig. 1 are given the same reference numerals and their description is omitted as appropriate.
    As shown in FIG. 4, in this change, a bearing 48b is disposed at the end portion of the shaft 46 instead of the center of the shaft 46. An energy-generating turbine blade 37 is attached between the bearing 48b and the permanent magnet * 4 ^ ** at * 5 ** branch 4 6.
    The dental handpiece power generator 40 includes a lower case 38 and an upper case 39 to be attached to an inner peripheral surface on a side of the lower case 38.
    An energy generating part including the permanent magnet 45, the cylindrical coil 44 and the yoke 43 is received in a state where an outer peripheral surface of the cylindrical body portion 50 a of the outer member 50 is in close contact with the inner peripheral surface of the lower case 38 stands.
    The power generating turbine blade 37 is accommodated inside the upper case 39 at a predetermined interval.
    The upper case 39 is formed with a through hole for introducing air to pass therethrough.
    A bearing holding member 54b for holding the bearing 48b is fitted in the interior of the upper case 39.
    The bearing holding member 54 b includes a recess configured to receive a blade portion of the power generating turbine blade 37, and the recess is formed on its side surfaces with through holes communicating with the through hole formed in the upper case 39 they go through. The two through holes are air introduction holes 90. The plurality of air introduction holes 90 are formed so as to penetrate toward the rotational direction of the power generating turbine blade 37.
    A bottom portion of the recess formed on the bearing support member 54b for receiving the power generating turbine blade 37, 19, 19 is further contained in this. r1: ie, configured to receive the bearing 48b. Then, on the outside of the recess for the bearing 48b, an air channel hole 91 is formed which serves as an air passage after the power generating turbine blade 37 has been rotated. The air passing through the air passage hole 91 is used to rotate a tool turbine 21, as described below.
    Fig. 5 shows a cross section of a dental handpiece 1, in which the power generator 40 is integrated for a dental handpiece.
    In the dental handpiece 1, the power generator 40 is used for a dental handpiece into which the power generating turbine blade 37 previously described in connection with FIG. 4 is previously integrated.
    As shown in FIG. 5, the dental handpiece 1 includes a tool turbine 21 which drives a treatment tool 22 to rotate about an axial line L, a head portion 2 configured to hold the tool turbine 21 to be rotatable , and a grip portion 3 configured to be held by an operator.
    The grip portion 3 includes an air supply tube 56 and a water supply tube 57 at a rear end portion to extend forward.
    The grip portion 3 includes a receiving portion 80 serving as a passage for air supplied from the air supply tube 56, and configured to receive therein the dental handpiece power generator 40.
    The air flow supplied from the air supply tube 56 passes between the lower housing 38 and the handle portion 3, and is further restricted in the air introduction holes 90 which are in the upper housing 39 and the 20 • * · * »* · · · »« · »· · · ·
    Bearing support 54 provided w £ td £ fi, 'ύηίΓ * iri &quot; rö &quot; The permanent magnet 45 provided on the outer land of the shaft 46 rotates integrally with the shaft 46 and causes the cylindrical coil 44 to generate the inductive voltage.
    The electrode formed in the cylindrical coil 44 leads the electric cable 32 via the terminal pins 49 and is supplied to an LED 31. The LED 31 is disposed on the edge toward the treatment tool 22 and is capable of illuminating the edge of a location to be treated by the dental handpiece 1 by energy supplied by the dental handpiece power generator 40.
    On the other hand, the air after turning the power generating turbine blade 37 through the air passage hole 91 formed in the bearing holding member 54 is discharged from the dental handpiece power generator 40, and then further into the tool turbine 21 through an air passage 33 introduced, thereby turning the treatment tool 22.
    Referring now to FIG. 6 and FIG. 7, a second. Embodiment of the power generator 40 for a dental handpiece described.
    As shown in Fig. 6, in the second embodiment, a coil 44a and the coil 44b are formed on two teeth on a laminated silicon steel plate formed to protrude inward, instead of the cylindrical coil 44 at the first Embodiment is described, wound up.
    To. In the case of the dental handpiece power generator 40 in the second embodiment, the same parts as in the dental handpiece power generator 40 described in conjunction with FIG. 1 and FIG. 4 are given the same reference numerals and description thereof 21 • I ································································································································· I···································
    7 is a perspective view of a state in which a yoke 43p on which the coils 44a, 44b are wound is disposed on the coil installing member 42 according to the second embodiment.
    As shown in Fig. 7, the yoke 43p of the second embodiment is formed of ten laminated silicon steel plates. The yoke 43 includes a disk portion 43pa punched at its center in an H-shape, and two teeth 43pb formed to oppose the disk portion from the disk portion 383pa.
    The disk portion 43pa of the yoke 43p except for the teeth 43pb is formed in a rectangular shape, and the two teeth 43pb are formed therein from two opposite sides of the rectangle toward the center. The coils 44a and 44b are wound around the two teeth 43pb and 43pb, and the end portions of the coils are connected to the terminal pins 49, not shown.
    Between the two teeth 43pb, which are wound by the coils 44a and 44b, the cylindrical body portion 42a of the Spuleneinbauelements 43 is arranged.
    The two teeth 43pb integrally formed with the disk portion 43pa may be formed separately and coupled.
    The end portions on the middle side of the teeth 43pb shown in FIG. 7, as formed in a flat shape, may be formed to be. curving in the same curvature as the outer peripheral surface of the cylindrical body portion 42a, so that the whole portion comes into close contact with the cylindrical body portion 42a. 22 22 · · · Φ Φ • * ΦΦ • · Φ · Φ Φ. Φ Φ · Φ the
    Further, in the described embodiment, a dental handpiece power generator 40 in which the power generating turbine blade 37 is integrated in advance as in the dental handpiece power generator 40 described in connection with Fig. 4 has been described as an example. However, a dental handpiece power generator 40 which is not provided with the power generating turbine blade 37 as in the dental handpiece power generator 40 described in connection with Fig. 1 is also applicable. In this case, the bearing holding member 54, the bearing 48, and the shaft 46 are configured as shown in FIG.
    Next, the result of a performance test performed on the dental handpiece power generator 40 configured in this manner will be described.
    In this performance test, changes in the coil resistance value were used in the case where the high pressure steam sterilization process (continuous high pressure steam sterilization: 135 ° C, vapor pressure: 2 atm) was performed on the dental handpiece power generator 40 in Example 1 and Example 2 wherein the power generators for a dental handpiece 40 according to the first embodiment and the second embodiment were used, and the power generators for a dental handpiece 40 according to Comparative Examples 1 to 4 were measured. (a) Example 1
    In Example 1, the test was performed on the dental handpiece power generator 40 according to the first embodiment shown in FIGS. 1 and 4.
    The bobbin installation member 42 (inner housing) was formed of PPS containing more than 40% GF (glass fibers) to have an inner diameter of 05.5, the cylindrical coil 44 of the winding of hexagonal pattern, ** di * £ aMs * ti $ m * 'R.TW' * was formed with a diameter of 00.1, was wound on it and secured with an insulating tape. Then the yoke 43, consisting of 34 silicon steel wafers with 09 YMBOL 180 f &quot; symbol &quot; As 12 07 x t0.3 was formed on the outer periphery of the cylindrical coil 44 of the hexagonal pattern winding, the silicone-based resin was injected, and then the outer member 50 (outer case) was mounted thereon in a fully sealed state. Also, the permanent magnet 45 made of a 2-17 Sm-Co (samarium-cobalt) sintered magnet with 04 YMBOL 180 f &quot; symbol &quot; is formed 12 01 x tlO, attached to the shaft 46 and rotatably supported by the bearings 47 and 48 inside the Spuleneinbauelements 42. The unit of diameter 0 was mm (which also applies to the description below).
    The dental handpiece power generator 40 configured as described above was rotated to 50,000 RPM and placed in an atmosphere of continuous high-pressure steam sterilization at 135 ° C with the vapor pressure of 2 atm (high-pressure steam sterilization process) after the measurement the generated energy (watts) and the coil resistance value were measured. (b) Example 2
    In Example 2, the test was carried out on the dental handpiece power generator 40 according to the second embodiment shown in FIGS. 6 and 7.
    The coils 44a and 44b were formed by winding the PIW at 01.0 on the teeth 43pb of the yoke 43p formed of ten 09 x 05.5 x t0.74 silicon steel wafers.
    The coils 44a and 44b were inserted into the cylindrical body portion 42a of the coil installing member 42 formed of the PPS containing more than 40% GF (glass fibers), then the silicone-based resin was injected, and the outer member 50 became complete sealed 24 · · · «« · «« ·················································· «
    Condition set on it. Also, the tfaue "mägnet * # 45" formed of a sintered magnet of Nd (neodymium) with 07 χ01 χ t10 was fixed to the shaft 46 and rotatably supported by the bearings 47 and 48 inside the coil fitting 42 ,
    The dental handpiece power generator 40, configured as described above, was rotated to 30,000 RPM and placed in an atmosphere of continuous high pressure steam sterilization at 135 ° C with the vapor pressure of 2 atm (high pressure steam sterilization process) after the measurement the generated energy (watts) and the coil resistance value were measured. (c) Comparative Example 1
    In Comparative Example 1, the same configuration as in Example 1 was used, except that the material of the coil installing member 42 was changed from PPS to aluminum. (d) Comparative Example 2
    In Comparative Example 2, the same configuration as in Example 1 was used except that the cylindrical coil 44 was changed from AIW to UEW. (e) Comparative Example 3
    In Comparative Example 3, the same configuration as in Example 1 was used, except that the injected resin was changed from the silicone-based resin to the epoxy-based resin. (f) Comparative Example 4
    In Comparative Example 4, the same configuration as in Example 2 was used, except that the materials of the coils 44a and 44b were changed from AIW to PEW. 25 »····» * * * ····· ** · · *
    FIG. 8 shows the measurement result of the first-to-third recovery examples 1 and 2 and Comparative Examples 1 to 4.
    Fig. 8A shows measured values of the output energy (Watts) before the continuous high pressure steam sterilization was carried out in the respective examples and the comparative examples.
    Fig. 8B shows changes in the coil resistance value with time caused by the continuous high-pressure steam sterilization in the respective examples and comparative examples.
    Since the high pressure steam sterilization process is generally performed repeatedly, it is necessary that the performance of the dental handpiece power generator 40 with respect to the continuous high pressure steam sterilization is not affected for more than a certain period of time, that is, the coil resistance value is not drops. In the embodiment, 250 hours is taken as the reference time T for determining that the required performance is maintained over the high pressure steam sterilization.
    As shown in Fig. 8B, in the case of Examples 1 and 2, in which the coils of AIW were used and the silicone-based resin was filled, no decrease in the resistance was observed even after 2000 hours or more elapsed, and it became achieved a satisfactory result that went well beyond 250 hours.
    On the other hand, in the case of Comparative Example 3 using the coils of AIW but filling the epoxy-based resin, no lowering of the resistance due to the effect of the AIW was observed until about 300 hours, which exceeded the reference time of 250 hours , From then on, however, the resistance value sank significantly and later. Due to a problem of grates and sources, it later came to a separation. 26 • · I · * · «f
    On the other hand, in Comparative Example 2, where UEW or PEW was used for the coils as in the prior art and the silicone-based resin was filled, the reference time of 250 hours could not be achieved, the resistance value dropped significantly to about 50 hours, and in both cases a separation occurred after about 200 hours.
    From the above description, the onset of the coil resistance deterioration could be shifted to about 300 hours by using the coils of AIW as coils.
    By filling with the silicone-based resin in addition to using the coils of AIW as coils, it was possible to prevent the deterioration of the resistance for a period of more than 2000 hours.
    In Comparative Example 1, since the AIW was used for the coils and the silicone-based resin was filled, the deterioration of the resistance value itself did not occur.
    However, since aluminum was used as the material for the coil installing member 42, a surge occurred, and thus a loss occurred, so that the generated power was 0.2 watts and the power required for an LED (0.5W) could not be reached, as shown in Fig. 8A.
    As has been described so far, according to the present invention power generator 40 for the coils 44, 44a and 44b by the application of AIW or PIW, not only high temperature resistant performance is possible but also high pressure performance -
    Steam sterilization process during the reference time T sufficiently maintained.
    Accordingly, one can estimate the number of repetitions of the high-pressure steam sterilization process applied to the
    Power generator 40 for a dental änd§tuc.k ** ÄftgVtf h h * det can be increased.
    Further, in the embodiment, the adhesiveness of the outer member 50 relative to the coil installing member 42 is improved by filling the cylindrical receiving portion formed therebetween with the silicone-based resin so that the coils 44, 44a and 44b can be wound, without forming a gap.
    Accordingly, by forming the coils 44, 44a, and 44b of AIW or PIW and using the silicone resin as the filler material, permanent prevention of deterioration of the coil is achieved, and thus the power generator 40 can be used for a dental handpiece, although the High-pressure steam sterilization process is repeatedly performed.
    The respective embodiments of the dental handpiece power generator 40 of the invention have heretofore been described. However, the invention is not limited to the above-described embodiments, and various changes can be made in the scope described in the respective claims.
    For example, although the case where the AIW or PIW is used for the coils 44, 44a and 44b and the silicone resin is used as the filler is described in the above embodiments, it is also possible to use only one of these options. When the silicone resin is not filled, it is preferred to fill in another heat-resistant resin such as epoxy-based resin.
    Although the power generator 40 for a dental handpiece has been described as an inner rotor type in the previously-shown embodiments, a power generator 40 for a dental handpiece may also be applicable to an outer rotor type. Also in this case, either the use of the AIW or PIW 28 * 28 * • * ♦ »t · * · · 4 · · · · · · · ·» · can be sent to the bobbins or the filling of 'SililconTiät ^' ^ FeYi or both. When no silicone resin is filled, it is preferable to fill in another heat-resistant resin such as epoxy-based resin.
    In the outer rotor type, an outer cylinder is configured to receive the coils, or the coil and the yoke are disposed between the coils and the permanent magnet, and the coils are in close contact or near an inner peripheral surface of the outer cylinder arranged. Also, by filling the inside of the outer cylinder with resin, the coils are wound by the resin and the outer cylinder.
    The winding frame in which the cylindrical coil 44 described in the first embodiment is manufactured is not limited to a hexagonal shape but has only a polygonal shape.
    Although the case where the cylindrical coil 44 has been used is also described in the first embodiment, the other types of coils described in the second embodiment may be used.
    In the embodiment, the dental handpiece power generator 40 has also been described as one of the rotary electric machines, but the invention is not limited to the dental handpiece and may be used with power generators to be subjected to the high pressure steam sterilization process.
    Further, the invention is not limited to the power generator and may be applied to engines to be subjected to the high pressure steam sterilization process. In this case, the invention is applicable to a motor in which an AIW or PIW is used for a three-phase coil, for example, and AC power is supplied to the coil while it is being turned on. *** 29 ··· + ··· · · · "* ··" ·· " ♦ · t 4 «#« · * »* is switched one after the other, whereby * si * e Äferf'etatf ^ VRtöijneten rotates.
    The motor may be any type of internal rotor type and external rotor type motor. However, when filled with resin, resins other than the silicone-based resin may be used although the silicone-based resin is preferred.
    When the invention is applied to the engine, the power generating turbine blade 37, the upper case 39 and so on described in Figs. 4 and 6 are not necessary, and the bearing 48, the bearing holding member 54 and the shaft 46, which are shown in Fig. 1, are used.
    In the embodiments described above, the case of a two-pole structure has been described. However, the number of poles of the stator and the rotor is not limited to this, and any number of poles are applicable.
    In the above-described embodiments, the case where the silicone-based resin is filled in the receiving portion has been described. However, the resin to be filled may be another heat-resistant resin, such as the epoxy-based resin, instead of the silicone-based resin, as long as the AIW or PIW is used as the material for the coils.
    In the above-described embodiments, the case where the silicone-based resin is filled in the entire part of the cylindrical accommodating portion formed between the coil installing member 42 and the outer member 50 has been described. However, at least a portion of the coil attached to the coil installing member 42 and the peripheral edge thereof may be filled with resin instead of the entire part of the inside of the receiving portion. The resin in this case may be the epoxy-based resin, although the silicone-based resin is preferred. 30 · «· · · · · · · · · · · · · · ·
    • »« »« I
    If the resin is filled in this way not * * * * * ^ ^ ^ ^ iih * Yftneren of the receiving section, it is preferred to use the coils with. Cover resin and fill the resin to fill the joint portion between the Spuleneinbauelement 42 and the outer member 50.
    权利要求:
    Claims (1)
    [1]
    Claims 1. An energy generator for a dental handpiece intended to be used for treatment and subjected to high-pressure steam sterilization, comprising: a rotary shaft; a permanent magnet fixed to the shaft and having a plurality of magnetic poles arranged in a circumferential direction at an outer edge thereof; a Spuleneinbauelement having a cylindrical body portion in a position opposite to the permanent magnet across an air gap; an outer member constituting a cylindrical receiving portion by being adhered to the coil installing member; a spool attached to an outer edge portion of the cylindrical body portion in the receiving portion; a yoke disposed on an inner peripheral side of the outer member to face the spool in the receiving portion; and a resin covered in the accommodating portion within a region covering at least the coil fixed to the coil installing member and a peripheral edge thereof, the coil being formed of a polyamide-imide-copper wire or a polyimide-copper wire. The dent generator power generator according to claim 1, wherein the resin to be filled in the receiving portion is a silicone-based resin. A dental handpiece power generator according to claim 1 or claim 2, wherein the resin is filled so as to fill a joint portion between the coil installing member and the outer member. A dental handpiece power generator according to claim 1, 2 or 3, wherein the joint surfaces of the coil insertion member and the outer member are assembled so as to be arranged in a radial direction of the cylindrical body portion. The power generator for a dental handpiece according to any one of claims 1 to 4, further comprising: a power generating turbine blade fixed to the rotary shaft.
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    同族专利:
    公开号 | 公开日
    JP2013085750A|2013-05-13|
    JP5918498B2|2016-05-18|
    AT512093A3|2013-06-15|
    AT512093B1|2014-10-15|
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    WO2011043143A1|2009-10-06|2011-04-14|セイコーインスツル株式会社|Rotating electric machine, and dental or medical handpiece|
    WO2011043142A1|2009-10-06|2011-04-14|セイコーインスツル株式会社|Rotating electric machine, and dental or medical handpiece|WO2017026550A1|2015-08-10|2017-02-16|日本電産株式会社|Motor|
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    法律状态:
    2021-06-15| MM01| Lapse because of not paying annual fees|Effective date: 20201001 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011229646A|JP5918498B2|2011-10-19|2011-10-19|Dental handpiece generator|
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