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JP7045355B2 - Lead screw device - Google Patents
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JP7045355B2 - Lead screw device - Google Patents

Lead screw device Download PDF

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Publication number
JP7045355B2
JP7045355B2 JP2019200947A JP2019200947A JP7045355B2 JP 7045355 B2 JP7045355 B2 JP 7045355B2 JP 2019200947 A JP2019200947 A JP 2019200947A JP 2019200947 A JP2019200947 A JP 2019200947A JP 7045355 B2 JP7045355 B2 JP 7045355B2
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lead screw
bearing
diameter portion
hollow shaft
bracket
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JP2021078182A (en
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東暉 王
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Shinano Kenshi Co Ltd
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Shinano Kenshi Co Ltd
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Priority to JP2019200947A priority Critical patent/JP7045355B2/en
Priority to CN202011132326.1A priority patent/CN112787478B/en
Publication of JP2021078182A publication Critical patent/JP2021078182A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
    • H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
    • H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Support Of The Bearing (AREA)

Description

本発明は、リードスクリュー装置に関する。 The present invention relates to a lead screw device.

リードスクリューとモータとを備えたリードスクリュー装置が知られている。例えばリードスクリューを回転可能に支持する軸受を備えた場合がある（特許文献１参照）。このような軸受は、モータの熱により熱膨張する場合がある。上記特許文献１では、ウェーブワッシャによりその熱膨張が吸収され、軸受の破損が防止されている。 A lead screw device including a lead screw and a motor is known. For example, it may be provided with a bearing that rotatably supports the lead screw (see Patent Document 1). Such bearings may thermally expand due to the heat of the motor. In Patent Document 1, the wave washer absorbs the thermal expansion and prevents the bearing from being damaged.

特開２０１７－２１５０１９号公報Japanese Unexamined Patent Publication No. 2017-215019

例えば２つの軸受を軸心方向に離れて配置する場合がある。この場合にも、これらの軸受の熱膨張を吸収できることが望ましい。 For example, two bearings may be arranged apart in the axial direction. In this case as well, it is desirable to be able to absorb the thermal expansion of these bearings.

そこで本発明は、２つの軸受の熱膨張を吸収できるリードスクリュー装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a lead screw device capable of absorbing the thermal expansion of two bearings.

上記目的は、リードスクリューと、前記リードスクリューの先端が突出し基端が内部に挿入された状態で前記リードスクリューを回転するモータと、を備え、前記モータは、前記リードスクリューの外周部の一部に嵌合した中空軸と、前記中空軸の外周部に嵌合したロータコアと、前記ロータコアに対向したステータと、前記ステータよりも前記先端側に配置された第１ブラケットと、前記ステータよりも前記基端側に配置され、前記第１ブラケットと共に前記ステータを保持する第２ブラケットと、前記第２ブラケットに螺合し、螺合量に応じて前記リードスクリューの軸心方向に移動するネジ蓋と、前記ロータコアよりも前記先端側で前記中空軸の外周に嵌合した第１軸受と、前記ロータコアよりも前記基端側で前記中空軸の外周に嵌合した第２軸受と、前記第１ブラケットと前記第１軸受との間に配置された弾性体と、を含み、前記中空軸は、前記第１軸受が嵌合した第１小径部、前記第１小径部よりも前記基端側にあり前記第１小径部よりも外径が大きく前記ロータコアが嵌合した大径部、前記大径部よりも前記基端側にあり前記大径部よりも外径が小さく前記第２軸受が嵌合した第２小径部、を含み、前記螺合量に応じて、前記ネジ蓋は、前記第２軸受、前記大径部、及び前記第１軸受を介して、前記第１ブラケットとの間で前記弾性体を圧縮する、リードスクリュー装置によって達成できる。 The above object includes a lead screw and a motor that rotates the lead screw with the tip of the lead screw protruding and the base end inserted therein, and the motor is a part of the outer peripheral portion of the lead screw. A hollow shaft fitted to the hollow shaft, a rotor core fitted to the outer peripheral portion of the hollow shaft, a stator facing the rotor core, a first bracket arranged on the tip side of the stator, and the stator more than the stator. A second bracket that is arranged on the base end side and holds the stator together with the first bracket, and a screw lid that is screwed into the second bracket and moves in the axial direction of the lead screw according to the amount of screwing. The first bearing fitted to the outer periphery of the hollow shaft on the tip side of the rotor core, the second bearing fitted to the outer periphery of the hollow shaft on the proximal end side of the rotor core, and the first bracket. The hollow shaft includes an elastic body arranged between the first bearing and the first bearing, and the hollow shaft is located on the proximal end side of the first small diameter portion to which the first bearing is fitted and the first small diameter portion. The outer diameter is larger than the first small diameter portion, the large diameter portion into which the rotor core is fitted, the base end side of the large diameter portion, and the outer diameter is smaller than the large diameter portion, and the second bearing is fitted. Including the second small diameter portion, the screw lid is connected to the first bracket via the second bearing, the large diameter portion, and the first bearing, depending on the amount of screwing. This can be achieved by a lead screw device that compresses the bearing.

２つの軸受の熱膨張を吸収できるリードスクリュー装置を提供できる。 A lead screw device capable of absorbing the thermal expansion of two bearings can be provided.

図１は、リードスクリュー装置の外観図である。FIG. 1 is an external view of a lead screw device. 図２Ａは、図１の第１軸受周辺の拡大図であり、図２Ｂは、図１の第２軸受周辺の拡大図である。2A is an enlarged view of the periphery of the first bearing of FIG. 1, and FIG. 2B is an enlarged view of the periphery of the second bearing of FIG.

図１は、リードスクリュー装置１の外観図である。リードスクリュー装置１は、リードスクリュー１０と、リードスクリュー１０を回転するモータ２０とを備える。リードスクリュー１０は、先端がモータ２０から突出し、基端はモータ２０の内部に挿入されている。リードスクリュー１０は、モータ２０により回転可能に保持された軸部１２、モータ２０から突出して外周面に溝が形成された雄ネジ部１１が形成されている。雄ネジ部１１には、ナット部材２００が螺合している。軸部１２の外周面には、雄ネジ部１１のような溝は形成されていない。リードスクリュー１０は金属製であるがこれに限定されない。尚、モータ２０はステッピングモータである。
FIG. 1 is an external view of the lead screw device 1. The lead screw device 1 includes a lead screw 10 and a motor 20 for rotating the lead screw 10. The tip of the lead screw 10 protrudes from the motor 20, and the base end is inserted inside the motor 20. The lead screw 10 is formed with a shaft portion 12 rotatably held by the motor 20 and a male screw portion 11 protruding from the motor 20 and having a groove formed on the outer peripheral surface. A nut member 200 is screwed into the male screw portion 11. A groove like the male screw portion 11 is not formed on the outer peripheral surface of the shaft portion 12. The lead screw 10 is made of metal, but is not limited thereto. The motor 20 is a stepping motor.

モータ２０は、ブラケット３０及び４０、ステータ５０、ロータコア６０、中空軸７０、調整ネジ８０、ネジ蓋１１０等を含む。互いに略円板状に形成されたブラケット３０及び４０は、略円筒状のステータ５０を挟むようにステータ５０に固定されている。換言すれば、ブラケット３０及び４０はステータ５０を保持している。ブラケット４０はリードスクリュー１０の基端側に配置され、ブラケット３０はブラケット４０よりもリードスクリュー１０の先端側に配置されている。ネジ蓋１１０は、詳しくは後述するがブラケット４０に螺合している。ブラケット３０及び４０は金属製であるがこれに限定されない。ステータ５０は、金属製である。ブラケット３０は第１ブラケットの一例であり、ブラケット４０は第２ブラケットの一例である。 The motor 20 includes brackets 30 and 40, a stator 50, a rotor core 60, a hollow shaft 70, an adjusting screw 80, a screw lid 110, and the like. The brackets 30 and 40 formed in a substantially disk shape with each other are fixed to the stator 50 so as to sandwich the substantially cylindrical stator 50. In other words, the brackets 30 and 40 hold the stator 50. The bracket 40 is arranged on the base end side of the lead screw 10, and the bracket 30 is arranged on the tip end side of the lead screw 10 with respect to the bracket 40. The screw lid 110 is screwed to the bracket 40, which will be described in detail later. Brackets 30 and 40 are made of metal, but are not limited thereto. The stator 50 is made of metal. The bracket 30 is an example of the first bracket, and the bracket 40 is an example of the second bracket.

ステータ５０内には、４つのロータコア６０や２つのマグネット６１、スペーサ６３、中空軸７０が配置されている。中空軸７０は、リードスクリュー１０の軸部１２の外周部に部分的に嵌合している。中空軸７０は金属製であるがこれに限定されない。中空軸７０は、小径部７１及び７２と大径部７３とが形成されている。小径部７１は、先端側に形成されている。大径部７３は、小径部７１よりも基端側に形成されている。小径部７２は、大径部７３よりも基端側に形成されている。大径部７３の外径は、小径部７１及び７２のそれぞれの外径よりも大きい。ここで、ブラケット３０及び４０は、それぞれ中空軸７０を回転可能に支持するための軸受９１及び９２を保持している。軸受９１の内輪は、小径部７１の外周面に嵌合している。同様に、軸受９２の内輪は、小径部７２の外周面に嵌合している。小径部７１は第１小径部の一例であり、小径部７２は第２小径部の一例である。軸受９１は第１軸受の一例であり、軸受９２は第２軸受の一例である。 In the stator 50, four rotor cores 60, two magnets 61, a spacer 63, and a hollow shaft 70 are arranged. The hollow shaft 70 is partially fitted to the outer peripheral portion of the shaft portion 12 of the lead screw 10. The hollow shaft 70 is made of metal, but is not limited thereto. The hollow shaft 70 is formed with a small diameter portion 71 and 72 and a large diameter portion 73. The small diameter portion 71 is formed on the tip side. The large diameter portion 73 is formed on the proximal end side of the small diameter portion 71. The small diameter portion 72 is formed on the proximal end side of the large diameter portion 73. The outer diameter of the large diameter portion 73 is larger than the outer diameter of each of the small diameter portions 71 and 72. Here, the brackets 30 and 40 hold bearings 91 and 92 for rotatably supporting the hollow shaft 70, respectively. The inner ring of the bearing 91 is fitted to the outer peripheral surface of the small diameter portion 71. Similarly, the inner ring of the bearing 92 is fitted to the outer peripheral surface of the small diameter portion 72. The small diameter portion 71 is an example of the first small diameter portion, and the small diameter portion 72 is an example of the second small diameter portion. The bearing 91 is an example of the first bearing, and the bearing 92 is an example of the second bearing.

４つのロータコア６０は、軸心方向に並ぶようにして中空軸７０の大径部７３の外周面に嵌合している。尚、ロータコア６０の数は４つに限定されず、１つであってもよい。マグネット６１は、ブラケット３０に隣接したロータコア６０とこれに隣接したロータコア６０との間に配置され、更に、ブラケット４０に隣接したロータコア６０とこれに隣接したロータコア６０との間にも配置されている。スペーサ６３は、４つのロータコア６０のうち中心側に配置された２つのロータコア６０の間に配置されている。マグネット６１は、薄い円板状であり、周方向に異なる極性が交互に並ぶように着磁されている。スペーサ６３は、アルミ製又は合成樹脂製の薄い円板状である。また、調整ネジ８０は、リードスクリュー１０の軸部１２の基端に形成されたネジ穴に螺合しており、螺合量に応じてリードスクリュー１０と中空軸７０との軸心方向での相対位置を調整する。このように、リードスクリュー１０、ロータコア６０、マグネット６１、スペーサ６３、中空軸７０、及び調整ネジ８０は、ブラケット３０及び４０、及びステータ５０に対して一体的に回転する。 The four rotor cores 60 are fitted to the outer peripheral surface of the large diameter portion 73 of the hollow shaft 70 so as to be aligned in the axial direction. The number of rotor cores 60 is not limited to four, and may be one. The magnet 61 is arranged between the rotor core 60 adjacent to the bracket 30 and the rotor core 60 adjacent thereto, and further arranged between the rotor core 60 adjacent to the bracket 40 and the rotor core 60 adjacent thereto. .. The spacer 63 is arranged between two rotor cores 60 arranged on the center side of the four rotor cores 60. The magnet 61 has a thin disk shape and is magnetized so that different polarities are alternately arranged in the circumferential direction. The spacer 63 has a thin disk shape made of aluminum or synthetic resin. Further, the adjusting screw 80 is screwed into a screw hole formed at the base end of the shaft portion 12 of the lead screw 10, and the lead screw 10 and the hollow shaft 70 are screwed in the axial direction according to the amount of screwing. Adjust the relative position. In this way, the lead screw 10, the rotor core 60, the magnet 61, the spacer 63, the hollow shaft 70, and the adjusting screw 80 rotate integrally with the brackets 30 and 40 and the stator 50.

ステータ５０には、不図示の複数のコイルが巻回され、これらの通電状態によりステータ５０が励磁される。これにより、ステータ５０とマグネット６１との間に作用する磁気的吸引力及び磁気的反発力によって、リードスクリュー１０、４つのロータコア６０、２つのマグネット６１、スペーサ６３、中空軸７０、及び調整ネジ８０が一体的に回転する。 A plurality of coils (not shown) are wound around the stator 50, and the stator 50 is excited by these energized states. As a result, the lead screw 10, the four rotor cores 60, the two magnets 61, the spacer 63, the hollow shaft 70, and the adjusting screw 80 are generated by the magnetic attraction force and the magnetic repulsion force acting between the stator 50 and the magnet 61. Rotates integrally.

以上のように、ロータコア６０はリードスクリュー１０に直接嵌合しているのではなく、中空軸７０の大径部７３の外周面に嵌合している。このため、例えばリードスクリュー１０とは外径の大きさが異なるリードスクリューを採用する場合には、中空軸７０とは異なる、そのリードスクリューの外径の大きさに対応した内径を有した中空軸を用意すればよく、ロータコア６０をそのまま流用できる。ここで、ロータコア６０は、ステータ５０との間に作用する磁力や磁束などの回転動力への影響を考慮して設計、製造する必要があり、コストが高い。このようなコストの高いロータコア６０を流用できるため、低コストで外径の大きさが異なるリードスクリューを容易に交換できる。 As described above, the rotor core 60 is not directly fitted to the lead screw 10, but is fitted to the outer peripheral surface of the large diameter portion 73 of the hollow shaft 70. Therefore, for example, when a lead screw having a different outer diameter from the lead screw 10 is used, the hollow shaft has an inner diameter corresponding to the outer diameter of the lead screw, which is different from the hollow shaft 70. The rotor core 60 can be used as it is. Here, the rotor core 60 needs to be designed and manufactured in consideration of the influence on the rotational power such as the magnetic force and the magnetic flux acting on the stator 50, and the cost is high. Since the rotor core 60 having such a high cost can be diverted, lead screws having different outer diameters can be easily replaced at low cost.

また、軸受９１及び９２の内輪も、リードスクリュー１０に直接嵌合しているのではなく中空軸７０に嵌合している。この場合も、中空軸７０とは内径の大きさが異なる中空軸を用意することにより、軸受９１及び９２をそのまま流用しつつ外径の大きさが異なるリードスクリューを採用できる。 Further, the inner rings of the bearings 91 and 92 are also fitted to the hollow shaft 70 instead of being directly fitted to the lead screw 10. Also in this case, by preparing a hollow shaft having an inner diameter different from that of the hollow shaft 70, it is possible to adopt a lead screw having a different outer diameter while using the bearings 91 and 92 as they are.

図２Ａは、図１の軸受９１周辺の拡大図である。軸受９１とブラケット３０との間には２つのウェーブワッシャ１００が軸方向に重ねて配置されている。ウェーブワッシャ１００は弾性体の一例である。図２Ｂは、図１の軸受９２周辺の拡大図である。ネジ蓋１１０の外周部には雄ネジ部１１２が形成され、ブラケット４０の雌ネジ部４２に螺合している。雄ネジ部１１２と雌ネジ部４２との螺合量に応じて、ネジ蓋１１０はブラケット４０に対して軸心方向に相対移動する。ここで、ネジ蓋１１０は、軸受９２に向けて突出して軸受９２の外輪に当接した突部１１４が形成されている。突部１１４は、軸受９２に対向するネジ蓋１１０の面の外周縁を周回するように形成されている。ネジ蓋１１０の突部１１４は軸受９２の外輪を先端側に押圧することにより、軸受９２の内輪は中空軸７０の小径部７２と大径部７３との境界に形成された段部７３２を先端側に押圧する。これにより、中空軸７０の大径部７３と小径部７１との境界に形成された段部７３１は、軸受９１の内輪を先端側に押圧する。これにより軸受９１は、軸受９１とブラケット３０との間に配置された２つのウェーブワッシャ１００を圧縮する。このように、ネジ蓋１１０の雄ネジ部１１２とブラケット４０の雌ネジ部４２との螺合量を調整することにより、ブラケット３０及び４０やステータ５０に対する中空軸７０やロータコア６０の軸心方向での相対位置を調整することができる。 FIG. 2A is an enlarged view of the periphery of the bearing 91 of FIG. Two wave washers 100 are vertically overlapped between the bearing 91 and the bracket 30. The wave washer 100 is an example of an elastic body. FIG. 2B is an enlarged view of the periphery of the bearing 92 of FIG. A male screw portion 112 is formed on the outer peripheral portion of the screw lid 110, and is screwed onto the female screw portion 42 of the bracket 40. The screw lid 110 moves relative to the bracket 40 in the axial direction according to the amount of screwing between the male screw portion 112 and the female screw portion 42. Here, the screw lid 110 is formed with a protrusion 114 that protrudes toward the bearing 92 and is in contact with the outer ring of the bearing 92. The protrusion 114 is formed so as to orbit the outer peripheral edge of the surface of the screw lid 110 facing the bearing 92. The protrusion 114 of the screw lid 110 presses the outer ring of the bearing 92 toward the tip end, so that the inner ring of the bearing 92 has a stepped portion 732 formed at the boundary between the small diameter portion 72 and the large diameter portion 73 of the hollow shaft 70. Press to the side. As a result, the stepped portion 731 formed at the boundary between the large diameter portion 73 and the small diameter portion 71 of the hollow shaft 70 presses the inner ring of the bearing 91 toward the tip end side. As a result, the bearing 91 compresses the two wave washers 100 arranged between the bearing 91 and the bracket 30. By adjusting the amount of screwing between the male screw portion 112 of the screw lid 110 and the female screw portion 42 of the bracket 40 in this way, in the axial direction of the hollow shaft 70 and the rotor core 60 with respect to the brackets 30 and 40 and the stator 50. The relative position of can be adjusted.

ここで、モータ２０の発熱により軸受９１及び９２が熱膨張する場合がある。例えば軸受９１が熱膨張して軸心方向に膨張しても、ウェーブワッシャ１００がその熱膨張を吸収するように弾性変形する。また、軸受９２が熱膨張して軸心方向に膨張しても、中空軸７０や軸受９１を介してウェーブワッシャ１００がその熱膨張を吸収する。中空軸７０が熱膨張する場合も同様である。このように、ウェーブワッシャ１００がこれらの熱膨張を吸収するため、これらの部材の破損などが抑制されている。なお、軸受９２側にもウェーブワッシャ１００を配置することも考えられるがネジ蓋１１０があるためウェーブワッシャ１００を配置する空間は無い。かといってネジ蓋１１０などからなる軸心方向の調整機構が無いと各部品の精度や組立精度が必要となるためコストアップにつながってしまう。 Here, the bearings 91 and 92 may thermally expand due to the heat generated by the motor 20. For example, even if the bearing 91 thermally expands and expands in the axial direction, the wave washer 100 elastically deforms so as to absorb the thermal expansion. Further, even if the bearing 92 thermally expands and expands in the axial direction, the wave washer 100 absorbs the thermal expansion via the hollow shaft 70 and the bearing 91. The same applies to the case where the hollow shaft 70 thermally expands. As described above, since the wave washer 100 absorbs these thermal expansions, damage to these members is suppressed. It is conceivable to arrange the wave washer 100 on the bearing 92 side as well, but since there is a screw lid 110, there is no space for arranging the wave washer 100. However, if there is no adjustment mechanism in the axial direction including the screw lid 110 or the like, the accuracy of each part and the assembly accuracy are required, which leads to an increase in cost.

上記実施例では、弾性体として２つのウェーブワッシャ１００を一例として説明したが、これに限定されず、単一のウェーブワッシャ１００であってもよいし、３つ以上のウェーブワッシャ１００であってもよい。また、弾性体はウェーブワッシャ１００以外のものであってもよく、例えば板バネやコイルスプリングであってもよい。 In the above embodiment, two wave washers 100 are described as an example of the elastic body, but the present invention is not limited to this, and a single wave washer 100 may be used, or three or more wave washers 100 may be used. good. Further, the elastic body may be something other than the wave washer 100, and may be, for example, a leaf spring or a coil spring.

以上本発明の好ましい実施形態について詳述したが、本発明は係る特定の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、変形・変更が可能である。 Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiment, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. It is possible.

１ リードスクリュー装置
１０ リードスクリュー
２０ モータ
３０ ブラケット（第１ブラケット）
４０ ブラケット（第２ブラケット）
５０ ステータ
６０ ロータコア
７０ 中空軸
７１ 小径部（第１小径部）
７２ 小径部（第２小径部）
７３ 大径部
９１ 軸受（第１軸受）
９２ 軸受（第２軸受）
１００ ウェーブワッシャ（弾性体）
１１０ ネジ蓋 1 Lead screw device 10 Lead screw 20 Motor 30 Bracket (1st bracket)
40 bracket (second bracket)
50 Stator 60 Rotor core 70 Hollow shaft 71 Small diameter part (1st small diameter part)
72 Small diameter part (second small diameter part)
73 Large diameter part 91 Bearing (1st bearing)
92 Bearing (2nd bearing)
100 wave washer (elastic body)
110 screw lid

Claims (3)

リードスクリューと、
前記リードスクリューの先端が突出し基端が内部に挿入された状態で前記リードスクリューを回転するモータと、を備え、
前記モータは、
前記リードスクリューの外周部の一部に嵌合した中空軸と、
前記中空軸の外周部に嵌合したロータコアと、
前記ロータコアに対向したステータと、
前記ステータよりも前記先端側に配置された第１ブラケットと、
前記ステータよりも前記基端側に配置され、前記第１ブラケットと共に前記ステータを保持する第２ブラケットと、
前記第２ブラケットに螺合し、螺合量に応じて前記リードスクリューの軸心方向に移動するネジ蓋と、
前記ロータコアよりも前記先端側で前記中空軸の外周に嵌合した第１軸受と、
前記ロータコアよりも前記基端側で前記中空軸の外周に嵌合した第２軸受と、
前記第１ブラケットと前記第１軸受との間に配置された弾性体と、を含み、
前記中空軸は、前記第１軸受が嵌合した第１小径部、前記第１小径部よりも前記基端側にあり前記第１小径部よりも外径が大きく前記ロータコアが嵌合した大径部、前記大径部よりも前記基端側にあり前記大径部よりも外径が小さく前記第２軸受が嵌合した第２小径部、を含み、
前記螺合量に応じて、前記ネジ蓋は、前記第２軸受、前記大径部、及び前記第１軸受を介して、前記第１ブラケットとの間で前記弾性体を圧縮する、リードスクリュー装置。 With the lead screw
A motor for rotating the lead screw with the tip of the lead screw protruding and the base end inserted therein is provided.
The motor is
A hollow shaft fitted to a part of the outer peripheral portion of the lead screw,
A rotor core fitted to the outer peripheral portion of the hollow shaft and
The stator facing the rotor core and
The first bracket arranged on the tip side of the stator,
A second bracket arranged on the base end side of the stator and holding the stator together with the first bracket,
A screw lid that is screwed into the second bracket and moves in the axial direction of the lead screw according to the amount of screwing,
A first bearing fitted to the outer periphery of the hollow shaft on the tip side of the rotor core, and
A second bearing fitted to the outer periphery of the hollow shaft on the base end side of the rotor core, and
Includes an elastic body disposed between the first bracket and the first bearing.
The hollow shaft is located on the base end side of the first small diameter portion into which the first bearing is fitted and the first small diameter portion, and has a larger outer diameter than the first small diameter portion and has a large diameter in which the rotor core is fitted. A second small-diameter portion, which is located on the base end side of the large-diameter portion and has an outer diameter smaller than that of the large-diameter portion and to which the second bearing is fitted, is included.
Depending on the amount of screwing, the screw lid is a lead screw device that compresses the elastic body with the first bracket via the second bearing, the large diameter portion, and the first bearing. .. 前記弾性体は、ウェーブワッシャを含む、請求項１のリードスクリュー装置。 The lead screw device according to claim 1, wherein the elastic body includes a wave washer. 前記弾性体は、複数の前記ウェーブワッシャを含む、請求項２のリードスクリュー装置。 The lead screw device according to claim 2, wherein the elastic body includes a plurality of the wave washers.
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