WO2014142242A1 - Mécanisme d'élargissement au moyen d'un actionneur - Google Patents

Mécanisme d'élargissement au moyen d'un actionneur Download PDF

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Publication number
WO2014142242A1
WO2014142242A1 PCT/JP2014/056679 JP2014056679W WO2014142242A1 WO 2014142242 A1 WO2014142242 A1 WO 2014142242A1 JP 2014056679 W JP2014056679 W JP 2014056679W WO 2014142242 A1 WO2014142242 A1 WO 2014142242A1
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WO
WIPO (PCT)
Prior art keywords
frame
displacement
actuator
shaped member
central
Prior art date
Application number
PCT/JP2014/056679
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English (en)
Japanese (ja)
Inventor
久郷　智之
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並木精密宝石株式会社
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Publication date
Application filed by 並木精密宝石株式会社 filed Critical 並木精密宝石株式会社
Publication of WO2014142242A1 publication Critical patent/WO2014142242A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
    • H02N2/105—Cycloid or wobble motors; Harmonic traction motors

Definitions

  • the present invention relates to an actuator that extracts a rotational motion from the other by moving one of a frame-shaped member or a central member with a telescopic member.
  • Patent Document 2 a piezoelectric motor in which the driving source is changed from a coil and a magnet to a piezoelectric element is used.
  • Patent Document 2 03-238771 (hereinafter described as Patent Document 2) is published.
  • the piezoelectric motor described in Patent Document 1 uses a structure in which an external gear in a frame-shaped member is rotated by driving piezoelectric elements arranged radially around the frame-shaped member.
  • the piezoelectric motor described in Patent Document 1 has a structure in which the frame-shaped member is driven to reciprocate in at least two directions.
  • the reproducibility of the rotational speed is improved and the torque fluctuation is reduced as compared with the piezoelectric motor before Patent Document 1. It has the following advantages.
  • the piezoelectric motor described in Patent Document 2 has a structure in which the frame-like member that is directly driven by the piezoelectric element in Patent Document 1 is driven via a displacement enlarging mechanism. For this reason, it is possible to increase the amount of movement of the frame-shaped member relative to the piezoelectric element and to enlarge the diameter of the frame-shaped member relative to the length of the piezoelectric element.
  • JP-A-60-160384 Japanese Patent Laid-Open No. 03-238771
  • the piezoelectric motor described in Patent Document 1 has a structure in which the element displacement direction and the frame-shaped member displacement direction are the same, and therefore the drive source for the size of the rotating frame-shaped member. There is a problem that the space occupied by the piezoelectric element becomes large.
  • the piezoelectric motor described in Patent Document 2 has a structure in which a displacement enlarging mechanism is sandwiched between the piezoelectric element and the frame-like member, which makes it difficult to reduce the planar shape. There is a problem that it cannot be set large because of the structure.
  • Patent Document 2 lacks versatility as a motor device because the output shaft deviates from the center of the element due to its structure.
  • the piezoelectric motors described in Patent Documents 1 and 2 do not have a structure for releasing the stress applied to the output shaft with respect to the durability between the drive source and the output. For this reason, when the output shaft receives a displacement from another driving source, the output shaft is fixed, and the rotation mechanism section cannot be operated. Further, in these two structures, the space occupied by the element is large with respect to the rotation mechanism portion, and it is difficult to enlarge the diameter of the rotation mechanism portion. For this reason, the torque output with respect to the piezoelectric element to be mounted and the input voltage is lowered.
  • the invention described in the present application can reduce the space occupied by the element with respect to the rotation mechanism without reducing the size of the expansion / contraction member serving as a drive source. It is an object of the present invention to provide an actuator that can improve reliability, increase the diameter of a rotating mechanism, and increase the torque of an output shaft associated therewith, as compared with a conventional piezoelectric motor of the same size.
  • a rotating mechanism portion comprising a frame-shaped member having an internal gear and a central member having an external gear is provided on the inner periphery of a ring-shaped lever-type displacement magnifying mechanism.
  • the technical feature is a structure in which the displacement enlarging mechanism expands the displacement of the telescopic member that is disposed and serves as a drive source, and drives the frame-like member or the central member. More specifically, the displacement of the expansion / contraction member serving as the drive source is expanded by the lever portion surrounding the rotation mechanism portion, and the other is rotated by connecting one of the frame-shaped member or the central member to the lever portion. It is a feature.
  • the second aspect of the present invention is technically characterized in that the structure described in the first aspect of the present application is provided with a plurality of displacement magnifying mechanisms connected to the frame member or the central member on the same plane. More specifically, it is characterized by a structure in which annular displacement enlarging mechanisms are arranged radially around the rotation mechanism portion, and each insulator portion is connected to one of the frame-shaped member or the central member. .
  • a technical feature is a structure in which the displacement enlarging mechanism is overlapped in the rotation axis direction of the central member and connected to one of the frame-shaped member or the central member. More specifically, the present invention is characterized in that a plurality of annular displacement enlarging mechanism portions that rotate the rotation mechanism portion by extending the rotation mechanism portion in the axial direction are provided in the axial direction.
  • the actuator according to the first aspect of the present invention can be downsized in its planar shape without reducing the size of the expansion / contraction member serving as a drive source.
  • the structure described in this application uses a drive mechanism that rotates the frame-shaped member or the central member by a connecting lever-type displacement enlarging mechanism that is annularly arranged around the frame-shaped member of the rotation mechanism section. That is, the connecting lever-type displacement enlarging mechanism is annularly arranged, so that the expansion and contraction member as a driving source is accommodated along the outer periphery of the frame-shaped member, and the entire outside of the frame-shaped member is used as a lever. The effect of increasing the enlargement ratio due to use can be obtained.
  • the tooth depth in the gears of the central member and the frame-like member can be set large due to the above effect.
  • This is an effect of increasing the amount of movement of the frame-like member of the rotating mechanism part with an increase in the enlargement ratio, and this effect makes it possible to improve the workability of the gear in the rotating mechanism part and increase the rotation speed in addition to the increase in torque. Become.
  • the displacement amount and the transmission efficiency are improved by the above effects, the input voltage to the telescopic member serving as the drive source can be reduced.
  • the frame member or the central member is driven via the displacement magnifying mechanism. For this reason, it is possible to operate the rotating mechanism portion even when a reaction force is applied from the output side, and to prevent the piezoelectric element serving as the drive source from being damaged.
  • the annular portion in the connecting lever type displacement magnifying mechanism is structured to be able to escape only by elasticity by the annular arrangement, and the lever portion absorbs the reaction force from the output shaft. By arranging them in an annular shape, the reaction force can be dispersed to prevent damage to not only the expansion / contraction member serving as the drive source but also the displacement enlarging mechanism.
  • the actuator according to the present invention has a structure in which the influence of thermal expansion is reduced due to its structure. This is because the displacement enlarging mechanism is driven via a gear in the rotation mechanism unit in addition to the annular arrangement. That is, in the structure using the displacement magnifying mechanism, the entire displacement magnifying mechanism expands and contracts due to thermal expansion. For this reason, in the actuator using the displacement magnifying mechanism, the displacement magnifying mechanism itself that enlarges the displacement of the drive source is also deformed by the thermal expansion, and as a result, the influence of the thermal expansion is enlarged.
  • the influence of the thermal expansion at the connecting position between the rotation mechanism and the displacement magnifying mechanism is reduced by connecting the lever parts in an annular arrangement, and the constant is achieved through the rotation mechanism having a gear.
  • a stable rotation output by the pitch can be obtained.
  • the above-mentioned elastic member it is possible to use a member such as a piezoelectric element, a magnetostrictive element, an electrostrictive element, a shape memory alloy, and other mechanical means.
  • the displacement magnifying mechanism used in the present invention is a ring-shaped connecting lever type structure. More specifically, when transmitting the displacement of the expansion / contraction member serving as the driving source to the rotation mechanism unit disposed in the central portion of the actuator, a plurality of displacement expansions are performed by using an annularly arranged displacement expansion mechanism having a gap in the central portion.
  • the rotation mechanism unit can be driven with a configuration in which the mechanisms are engaged with each other. For this reason, the torque transmitted to the rotating mechanism portion can be increased without reducing the lever portion of the displacement enlarging mechanism by using the structure described in this aspect.
  • the torque of the rotating mechanism can be increased while simplifying the overall structure. More specifically, by overlapping the displacement enlarging mechanism in the axial direction of the rotation mechanism portion, in addition to the increase in planar shape and torque similar to the second aspect, the structure is simplified and the rigidity is thereby improved. An effect can also be obtained.
  • FIG. 1 is an overall perspective view of an actuator according to an embodiment of the present invention
  • FIG. 2 is an exploded perspective view
  • FIG. 3 is a drive unit plan view.
  • the actuator described in the present embodiment includes a rotation mechanism portion including a central member 1 having a spacer 2 and an external gear 3 fixed on the outer periphery, and a frame-shaped member 6 having an inner gear portion provided on the inner periphery. Is formed in the central portion, and the number of teeth of the internal gear portion is smaller than the number of teeth of the external gear 3.
  • the drive unit that drives the frame-like member 6 is constituted by a connecting lever type displacement enlarging mechanism that is formed in an annular arrangement integrally with the frame 5 using the piezoelectric element 4 as a drive source.
  • two sets of displacement magnifying mechanisms are formed in one frame, and the two frames are stacked in the thickness direction and connected to the common frame-like member 6. The frame member 6 is moved to rotate the central member 1 fixed to the external gear 3.
  • FIG. 3 in the actuator described in the present embodiment, two sets of connecting lever-type displacement enlarging mechanisms formed in an annular arrangement with two piezoelectric elements 4 opposed to each other as drive sources in one frame.
  • the drive structure is formed by connecting the two displacement magnifying mechanism end portions C to the frame-like member 6 of the rotation mechanism portion provided at the center.
  • the two piezoelectric elements 4 arranged opposite to each other are alternately expanded and contracted so that the frame-like member 6 arranged at the center is translated in an annular shape.
  • the number of teeth of the internal gear provided on the inner periphery of the frame-shaped member 6 is one less than the number of teeth of the external gear 3 provided on the outer periphery of the center member 1.
  • the feed mechanism rotates the central member 1 by one tooth.
  • the piezoelectric elements are controlled using a sine wave cycle. More specifically, a sine wave signal shifted by 90 degrees is input to the two piezoelectric elements, and the frame member 6 is translated. For this reason, the actuator of this embodiment has a holding torque due to contact between the gears even when the input is cut off, and the center member can be fixed at a predetermined position.
  • the actuator described in the present embodiment reduces the overall planar shape without reducing the size of the piezoelectric element 4 serving as a drive source, increases the rotational speed, and increases the input voltage.
  • the effect of the decrease is also obtained.
  • the effect is obtained by using a connecting lever type displacement enlarging mechanism formed in an annular arrangement between the piezoelectric element 4 as a driving source and the rotating mechanism portion as an output.
  • the loss in the power transmission system to the rotation mechanism portion is suppressed by adopting an annular arrangement that forms a gap in the center portion, and the length of the lever portion T in the displacement expansion mechanism is maximized. It is possible to secure.
  • the frame-like member 6 provided at the center has a structure that receives stress F in an oblique direction from the end of the displacement magnifying mechanism. For this reason, the frame-shaped member can be moved with a high stroke in a limited space, and the diameter of the rotating mechanism portion can be increased in accordance with space saving of the drive structure.
  • connection between the displacement enlarging mechanism and the rotating mechanism is connected by the thin wall portion, so that both the power transmission and the structure in which the power from the other escapes are achieved.
  • the structure of pulling and pushing the thin part between the lever part T and the end part C of the displacement enlarging mechanism is used at the same time. For this reason, it has become possible to adopt a structure in which the frame-shaped member is released only by the elasticity of the thin portion with respect to the lateral displacement that occurs when the central member 1 receives stress from another drive source.
  • the frame per step can be manufactured by wire cutting, etching, press lamination, etc., the effect of improving mass productivity could be obtained.
  • the output torque as a piezoelectric motor can be increased in this embodiment.
  • This is an effect accompanying the space saving of the drive structure, and is due to the relative increase in the diameter of the frame-like member 6 due to the increase in the size of the rotation mechanism portion in the planar shape. Yes. More specifically, the effect of increasing the tooth depth of the gear provided in the rotation mechanism by increasing the diameter of the frame-shaped member 6 and the effect of increasing the driving torque during driving can be obtained.
  • the two frames are stacked in the thickness direction and the two frames are overlapped to change the direction by 90 degrees.
  • the present embodiment has a structure in which a connecting lever-type displacement enlarging mechanism arranged in a ring is integrally formed in the frame. For this reason, the influence of thermal expansion at the displacement magnifying mechanism end C, which is the connection position between the rotating mechanism and the displacement magnifying mechanism, is reduced against the influence of temperature changes such as thermal expansion, and stable rotation output is achieved. I was able to get it.
  • the frame can be manufactured with a single low thermal expansion material (Invar, Super Invar, etc.), it is possible to further reduce the influence of thermal expansion.
  • the piezoelectric elements 4 provided on each frame generate a displacement in one direction as a set of two elements, so that the piezoelectric elements 4 are operated with a torque twice that of the conventional structure in which the piezoelectric elements are arranged radially. Is possible. Further, since the same drive voltage is input to the elements in the set, the number of lead wires is four and the input waveform is two types. This makes it possible to reduce the structural and driver burden on the control system. Further, from the same technical point of view as this embodiment, the torque can be increased by increasing the number of frames that are connected to the frame-like member and the number of displacement magnifying mechanisms in the frame.
  • the enlargement mechanism is used to suppress dimensional expansion in the thickness direction, and without reducing the size of the expansion / contraction member serving as a drive source, the rotation mechanism unit can be reduced.
  • the space occupied by the expansion and contraction member can be reduced, and an actuator in which the diameter of the rotation mechanism can be easily increased compared to conventional piezoelectric motors of the same size represented by Patent Documents 1 and 2 can be provided. It was.

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

L'invention concerne un actionneur qui rend possible de réduire la taille d'un espace qui est occupé par un élément par rapport à un mécanisme rotatif sans réduire la taille d'un organe étirable qui sert de source d'entraînement, et qui simplifie l'accroissement du diamètre du mécanisme rotatif en comparaison avec les moteurs piézoélectriques conventionnels de même taille. Le déplacement d'un organe étirable (4) est élargi par un mécanisme (T, C) d'élargissement de déplacement de type levier auquel il est relié qui est formé dans un agencement annulaire, un organe d'armature (6) est agencé sur la périphérie intérieure du mécanisme d'élargissement de déplacement, et une structure dans laquelle l'organe d'armature est maintenu en une position qui fait face à l'organe extensible est utilisée et l'organe d'armature qui est associé à la section d'extrémité (T) du mécanisme d'élargissement de déplacement se déplace de manière parallèle par rapport à l'agencement annulaire. Par conséquent, il est possible d'accroître le couple de sortie de mécanismes rotatifs (1, 2, 3, 6).
PCT/JP2014/056679 2013-03-14 2014-03-13 Mécanisme d'élargissement au moyen d'un actionneur WO2014142242A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-052080 2013-03-14
JP2013052080A JP6097915B2 (ja) 2013-03-14 2013-03-14 拡大機構を利用したアクチュエータ

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WO2014142242A1 true WO2014142242A1 (fr) 2014-09-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3498147A1 (fr) * 2017-12-15 2019-06-19 Richard Wolf GmbH Instrument oblong à tige
CN117155233A (zh) * 2023-09-15 2023-12-01 安徽朗越能源股份有限公司 一种基于led路灯的光伏板调节装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578902B (zh) * 2014-12-26 2016-10-05 燕山大学 基于电磁夹持非接触式旋转压电电机
KR20210156994A (ko) 2020-06-19 2021-12-28 한국과학기술연구원 로터리 모터

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03273871A (ja) * 1990-03-22 1991-12-05 Nec Corp 圧電モータ
JP2001161083A (ja) * 1999-11-03 2001-06-12 Siemens Ag 電気機械式モータ
JP2010527573A (ja) * 2007-05-18 2010-08-12 コンチネンタル オートモーティヴ ゲゼルシャフト ミット ベシュレンクテル ハフツング 電気機械式のモータ、特に圧電式のマイクロステッピング駆動装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03273871A (ja) * 1990-03-22 1991-12-05 Nec Corp 圧電モータ
JP2001161083A (ja) * 1999-11-03 2001-06-12 Siemens Ag 電気機械式モータ
JP2010527573A (ja) * 2007-05-18 2010-08-12 コンチネンタル オートモーティヴ ゲゼルシャフト ミット ベシュレンクテル ハフツング 電気機械式のモータ、特に圧電式のマイクロステッピング駆動装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3498147A1 (fr) * 2017-12-15 2019-06-19 Richard Wolf GmbH Instrument oblong à tige
CN117155233A (zh) * 2023-09-15 2023-12-01 安徽朗越能源股份有限公司 一种基于led路灯的光伏板调节装置

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JP2014180123A (ja) 2014-09-25
JP6097915B2 (ja) 2017-03-22

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