JP2007285356A - Oldham coupling and motor with encoder having same - Google Patents

Oldham coupling and motor with encoder having same Download PDF

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Publication number
JP2007285356A
JP2007285356A JP2006111106A JP2006111106A JP2007285356A JP 2007285356 A JP2007285356 A JP 2007285356A JP 2006111106 A JP2006111106 A JP 2006111106A JP 2006111106 A JP2006111106 A JP 2006111106A JP 2007285356 A JP2007285356 A JP 2007285356A
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hubs
rotating shaft
hub
intermediate joint
oldham
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Yusuke Isozaki
雄介 礒崎
Kenji Matsuura
賢司 松浦
Norio Shimojo
紀雄 下城
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Yaskawa Electric Corp
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Yaskawa Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
    • F16D3/04—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow radial displacement, e.g. Oldham couplings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an Oldham coupling enabling the easy fitting of hubs fitted to both rotating shafts to an intermediate joint for joining both hubs to each other and reduced in the axial dimension. <P>SOLUTION: This Oldham coupling 3 comprises the hubs 4, 5 fitted to both axial ends and the intermediate joint 6 disposed between the hubs 4, 5 and fitted to both hubs 4, 5. The hubs 4, 5 are formed in an H-shape having center holes fitted onto rotating shafts 1, 2 and recesses 4b, 5b on the radial both sides of the center holes. The intermediate joint 6 comprises projections 6b, 6c on both surfaces of a flat plate part 6a at the portions corresponding to the recesses 4b, 5b of the hubs 4, 5. The projections 6b, 6c are so related that a straight line connecting the projections 6b, 6b on one surface crosses a straight line connecting the projections 6c, 6c on one surface. Slits 6d, 6e are formed in the projections 6b, 6c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、２つの回転軸を締結するオルダム継手と、これを備えたエンコーダ付モータに関するものである。   The present invention relates to an Oldham coupling for fastening two rotating shafts, and a motor with an encoder including the same.

例えばモータの回転を検出する場合、一般的にモータの回転軸にエンコーダの回転軸を連結して、エンコーダでモータの回転検出を行うようにしている。この場合、モータの回転軸とエンコーダの回転軸の軸心が精度良く一致しておれば何の支障もなく良好な回転検出が行える。しかし、モータの回転軸とエンコーダの回転軸の軸心を精度良く一致させることは、限られた時間とコストの中では現実的には難しい。そこで、モータの回転軸とエンコーダの回転軸とをオルダム継手を用いて連結している（例えば、特許文献１参照）。
図２は、従来技術におけるオルダム継手を示す斜視図である。
図２において、
１は例えばモータの回転軸（第１の回転軸）、２は例えばエンコーダの回転軸（第２の回転軸）、１３は前記第１の回転軸１と前記第２の回転軸とを連結するオルダム継手で、前記両軸端に取り付けられたハブ１４，１５と、前記ハブ１４，１５間に配置され、両ハブ１４，１５と嵌合する中間継手１６とからなっている。前記ハブ１４，１５と中間継手１６は、樹脂で構成されている。
前記ハブ１４とハブ１５は、同一形状で構成されており、説明はハブ１５を用いて行う。前記ハブ１５（１４）は、円柱状をしており、中央部に前記第１の回転軸１に嵌合する中央孔１５ａ（ハブ１４では図示していない）を有するとともに、反第１の回転軸１側の端面に、前記中央孔１５ａを径方向に横切る凹部１５ｂ（１４ｂ）を設けて構成されている。前記ハブ１４とハブ１５は、それぞれ第１の回転軸１と第２の回転軸２に嵌合されるが、前記凹部１４ｂと凹部１５ｂが十字状に交差するようにして、前記中間継手１６に嵌合される。
前記中間継手１６は、円板状に構成され、平板部１６ａの両面の、前記ハブ１４，１５の凹部１４ｂ，１５ｂに対応する位置に、前記凹部１４ｂ，１５ｂに嵌合する凸部１６ｂ，１６ｃを設けている。前記凸部１６ｂと凸部１６ｃも、ハブ１４，１５の凹部１４ｂ，１５ｂと同様に十字状に交差している。
このような構成において、第１の回転軸１と第２の回転軸２を連結する場合は、前記第１の回転軸１と第２の回転軸２の先端を、ハブ１４の中央孔とハブ１５の中央孔１５ａに嵌合させて、第１および第２の回転軸１，２にハブ１４，１５を取り付けるとともに、前記ハブ１４の凹部１４ｂを前記中間継手１６の凸部１６ｂに嵌合し、かつ、前記ハブ１５の凹部１５ｂを前記中間継手１６の凸部１６ｃに嵌合させる。
モータの回転軸である第１の回転軸１が回転すると、前記第１の回転軸１の先端に取り付けられているハブ１４も、第１の回転軸１とともに回転する。また、それに伴って、前記第１の回転軸１側の凸部１６ｂが前記ハブ１４の凹部１４ｂに嵌合している中間継手１６も回転する。また、前記中間継手１６の回転に伴って、前記凹部１５ｂが前記中間継手１６の凸部１６ｃに嵌合しているハブ１５が回転し、これにより前記ハブ１５を軸端に取り付けている第２の回転軸２が回転する。
この際、第１の回転軸１と第２の回転軸２の軸心が一致して偏心量及び、偏角量がゼロの場合は、オルダム継手１３は、軸間の偏心及び、偏角を吸収する必要がないので、前記中間継手１６が動くことなく第１の回転軸１の回転を第２の回転軸２に伝達する。
また、第１の回転軸１と第２の回転軸２の軸心が一致しておらず偏心している場合は、オルダム継手１３は、中間継手１６の両凸部１６ｂ，１６ｃがハブ１４，１５の凹部１４ｂ，１５ｂ内をスライドして偏心を吸収し、第１の回転軸１の回転を第２の回転軸２に伝達する。
また、第１の回転軸１と第２の回転軸２の軸心が一致しておらず、偏角している場合も、オルダム継手１３は、中間継手１６の両凸部１６ｂ，１６ｃがハブ１４，１５の凹部１４ｂ、１５ｂ内をスライドして偏角を吸収し、第１の回転軸１の回転を第２の回転軸２に伝達する。
実開昭６２−８６４１８号公報（第２図） For example, when detecting the rotation of the motor, the rotation shaft of the encoder is generally connected to the rotation shaft of the motor, and the rotation of the motor is detected by the encoder. In this case, as long as the axis of rotation of the motor and the axis of rotation of the encoder coincide with each other with good accuracy, good rotation detection can be performed without any trouble. However, it is practically difficult to match the axis of the motor rotation axis and the axis of the encoder with high accuracy within a limited time and cost. Therefore, the rotating shaft of the motor and the rotating shaft of the encoder are connected using an Oldham coupling (see, for example, Patent Document 1).
FIG. 2 is a perspective view showing an Oldham coupling in the prior art.
In FIG.
Reference numeral 1 denotes, for example, a rotating shaft (first rotating shaft) of a motor, 2 denotes, for example, a rotating shaft (second rotating shaft) of an encoder, and 13 connects the first rotating shaft 1 and the second rotating shaft. The Oldham coupling is composed of hubs 14 and 15 attached to both shaft ends, and an intermediate joint 16 which is disposed between the hubs 14 and 15 and is fitted to the hubs 14 and 15. The hubs 14 and 15 and the intermediate joint 16 are made of resin.
The hub 14 and the hub 15 have the same shape, and the description will be made using the hub 15. The hub 15 (14) has a columnar shape, and has a central hole 15a (not shown in the hub 14) that fits the first rotary shaft 1 at the center, and is anti-first rotation. A concave portion 15b (14b) that crosses the central hole 15a in the radial direction is provided on the end surface on the shaft 1 side. The hub 14 and the hub 15 are fitted to the first rotary shaft 1 and the second rotary shaft 2, respectively. The concave portion 14b and the concave portion 15b intersect with the intermediate joint 16 so that the concave portions 14b and 15b intersect in a cross shape. Mated.
The intermediate joint 16 is formed in a disc shape, and convex portions 16b and 16c fitted into the concave portions 14b and 15b at positions corresponding to the concave portions 14b and 15b of the hubs 14 and 15 on both surfaces of the flat plate portion 16a. Is provided. The convex portions 16b and the convex portions 16c also intersect in a cross shape like the concave portions 14b and 15b of the hubs 14 and 15.
In such a configuration, when the first rotary shaft 1 and the second rotary shaft 2 are connected, the tips of the first rotary shaft 1 and the second rotary shaft 2 are connected to the center hole of the hub 14 and the hub. The hubs 14 and 15 are attached to the first and second rotary shafts 1 and 2 by being fitted in the 15 central holes 15a, and the concave portions 14b of the hub 14 are fitted to the convex portions 16b of the intermediate joint 16. In addition, the concave portion 15b of the hub 15 is fitted into the convex portion 16c of the intermediate joint 16.
When the first rotating shaft 1 that is the rotating shaft of the motor rotates, the hub 14 attached to the tip of the first rotating shaft 1 also rotates together with the first rotating shaft 1. Along with this, the intermediate joint 16 in which the convex portion 16b on the first rotating shaft 1 side is fitted in the concave portion 14b of the hub 14 also rotates. Further, as the intermediate joint 16 rotates, the hub 15 in which the concave portion 15b is fitted to the convex portion 16c of the intermediate joint 16 rotates, whereby the hub 15 is attached to the shaft end. The rotation shaft 2 of the rotation rotates.
At this time, when the shaft centers of the first rotating shaft 1 and the second rotating shaft 2 coincide with each other and the amount of eccentricity and the amount of declination are zero, the Oldham coupling 13 has the eccentricity and declination between the shafts. Since it is not necessary to absorb, the rotation of the first rotating shaft 1 is transmitted to the second rotating shaft 2 without the intermediate joint 16 moving.
When the axis of the first rotary shaft 1 and the second rotary shaft 2 are not coincident and eccentric, the Oldham joint 13 has the hubs 14 and 15 having the two convex portions 16b and 16c of the intermediate joint 16. The recesses 14b, 15b are slid to absorb the eccentricity, and the rotation of the first rotating shaft 1 is transmitted to the second rotating shaft 2.
Further, even when the axis of the first rotary shaft 1 and the second rotary shaft 2 do not coincide with each other and the angle is deviated, the Oldham joint 13 has both convex portions 16b and 16c of the intermediate joint 16 as hubs. 14, 15 slides in the recesses 14b, 15b to absorb the declination, and transmits the rotation of the first rotating shaft 1 to the second rotating shaft 2.
Japanese Utility Model Publication Sho 62-86418 (Fig. 2)

しかしながら、このような従来技術においては、次のような問題があった。
（１）前述したように、第１の回転軸１と第２の回転軸２の軸心が一致しておらず偏心及び、偏角している場合は、オルダム継手１３は、中間継手１６の両凸部１６ｂ，１６ｃがハブ１４，１５の凹部１４ｂ，１５ｂ内をスライドして偏心及び、偏角を吸収し、第１の回転軸１の回転を第２の回転軸２に伝達するわけであるが、従来のオルダム継手１３は、次のような理由でスムーズなスライドができず、軸間の偏心及び、偏角の吸収が良好に行えなかった。
(a) 中間継手１６の凸部１６ｂ，１６ｃは、ひとつの大きな塊として構成されており、ハブ１４，１５との嵌合時に凸部１６ｂ，１６ｃを圧縮する形で変形するための弾力性に乏しい。
(b) ハブ１４，１５の凹部１４ｂ，１５ｂと中間継手１３の凸部１６ｂ，１６ｃはガタなく嵌合される必要があるが、ハブ１４，１５は、凹部１４ｂ，１５ｂの両側の壁にあたる部分が、容量の大きなハブ本体で構成されており、中間継手１６の凸部１６ｂ，１６ｃが嵌合されてきても、壁となる部分が弾力性に乏しいため凹部１４ｂ，１５ｂが広がりにくい。
（２）更に中間継手１６の強度を確保するためには、平板部１６ａの厚さ（軸方向の長さ）を大きくする必要があるが、この場合、オルダム継手１３としての軸方向の全幅寸法が大きくなってしまう。
本発明は、このような問題を解決するためになされたもので、両回転軸に取付けられるハブと、両ハブを繋ぐ中間継手との嵌合が容易で、かつ軸方向寸法の短いオルダム継手を提供することを目的とするものである。 However, such conventional techniques have the following problems.
(1) As described above, when the shaft centers of the first rotating shaft 1 and the second rotating shaft 2 do not coincide with each other and are decentered and declinated, the Oldham joint 13 is connected to the intermediate joint 16. Both convex portions 16b and 16c slide in the concave portions 14b and 15b of the hubs 14 and 15 to absorb the eccentricity and declination, and transmit the rotation of the first rotary shaft 1 to the second rotary shaft 2. However, the conventional Oldham joint 13 cannot be smoothly slid for the following reasons, and the eccentricity between the shafts and the absorption of the deflection angle cannot be satisfactorily performed.
(a) The convex portions 16b and 16c of the intermediate joint 16 are configured as one large lump, and are elastic to deform the convex portions 16b and 16c so as to be compressed when they are fitted to the hubs 14 and 15. poor.
(b) The concave portions 14b and 15b of the hubs 14 and 15 and the convex portions 16b and 16c of the intermediate joint 13 need to be fitted without play, but the hubs 14 and 15 are portions corresponding to the walls on both sides of the concave portions 14b and 15b. However, even if the convex parts 16b and 16c of the intermediate joint 16 are fitted, the concave parts 14b and 15b are difficult to spread because the wall part is poor in elasticity.
(2) In order to further secure the strength of the intermediate joint 16, it is necessary to increase the thickness of the flat plate portion 16a (the length in the axial direction). In this case, the full width dimension in the axial direction as the Oldham joint 13 is required. Will become bigger.
The present invention has been made to solve such a problem. An Oldham coupling that is easy to fit between a hub attached to both rotating shafts and an intermediate joint that connects both hubs and has a short axial dimension is provided. It is intended to provide.

上記問題を解決するため、本発明は、次のように構成したものである。
請求項１に記載のオルダム継手の発明は、軸端が相対向する２つの回転軸間に介在され、一方の回転軸の回転力を他方の回転軸へ回転伝達するオルダム継手において、前記オルダム継手が、前記両軸端に取り付けられたハブと、前記ハブ間に配置され、両ハブと嵌合する中間継手とからなり、前記ハブは、前記回転軸に嵌合する中央孔と、前記中央孔の径方向両側に凹部を有するＨ字状に構成され、前記中間継手は、両面の前記ハブの凹部と対応する部分に、凸部を有するとともに、前記両面の凸部は、片面の凸部どおしを結ぶ直線が十字に交差する位置関係にあり、かつ、前記凸部にスリットを有して構成されていることを特徴とするものである。
請求項２に記載の発明は、前記中間継手が、それぞれの面の前記凸部の両側に梁を設けて構成されていることを特徴とするものである。
請求項３に記載のエンコーダ付モータの発明は、モータの回転軸に一方のハブを嵌合取り付けし、エンコーダの回転軸に他方のハブを嵌合取り付けし、前記両ハブを中間継手で連結したオルダムを備えたエンコーダ付モータにおいて、前記オルダム継手を、請求項１または２に記載のオルダム継手で構成したことを特徴とするものである。 In order to solve the above problems, the present invention is configured as follows.
The invention of the Oldham coupling according to claim 1 is an Oldham joint in which the shaft end is interposed between two rotating shafts facing each other and transmits the rotational force of one rotating shaft to the other rotating shaft. Comprises a hub attached to both ends of the shaft, and an intermediate joint that is disposed between the hubs and is fitted to both hubs. The hub has a center hole that fits the rotating shaft, and the center hole. The intermediate joint has a convex portion at a portion corresponding to the concave portion of the hub on both sides, and the convex portion on both sides is a convex portion on one side. The straight line connecting the crosses is in a positional relationship where it intersects with a cross, and the convex portion has a slit.
The invention according to claim 2 is characterized in that the intermediate joint is configured by providing beams on both sides of the convex portion of each surface.
In the invention of the motor with an encoder according to claim 3, one hub is fitted and attached to the rotating shaft of the motor, the other hub is fitted and attached to the rotating shaft of the encoder, and the both hubs are connected by an intermediate joint. In the motor with an encoder provided with Oldham, the Oldham joint is constituted by the Oldham joint according to claim 1 or 2.

本発明によれば、次のような効果がある。
請求項１に記載の発明によると、中間継手の凸部にスリットを形成し、かつハブをＨ字状に構成することにより、ガタが無く、かつ円滑にスライド可能に連結する必要のあるハブの凹部と、両ハブの凸部の嵌合をきわめてスムーズに行うことができ、精度の良い回転伝達ができるオルダム継手を提供することができる。また、ハブの凹部を回転軸の前方でなく上方に位置させることにより、オルダム継手の全長を短くすることができる。
請求項２に記載の発明によると、中間継手の凸部の裏面に梁を形成するので、中間継手の軸方向の幅寸法を長くすることなく強度を上げることができ、信頼性を向上することができるオルダム継手を提供することができる。
請求項３に記載の発明によると、全長を長くすることなく、精度がよく、かつ信頼性の高い回転検出ができるエンコーダ付モータを提供することができる。 The present invention has the following effects.
According to the first aspect of the present invention, by forming a slit in the convex portion of the intermediate joint and forming the hub in an H shape, there is no backlash and the hub needs to be smoothly slidably connected. It is possible to provide an Oldham joint that can smoothly fit the concave portion and the convex portion of both hubs and can transmit rotation with high accuracy. In addition, the total length of the Oldham coupling can be shortened by positioning the concave portion of the hub not at the front of the rotating shaft but at the upper side.
According to the invention described in claim 2, since the beam is formed on the back surface of the convex portion of the intermediate joint, the strength can be increased without increasing the axial width dimension of the intermediate joint, and the reliability can be improved. It is possible to provide an Oldham coupling that can be used.
According to the third aspect of the present invention, it is possible to provide a motor with an encoder that can detect rotation with high accuracy and high reliability without increasing the overall length.

以下、本発明の実施例を図に基づいて説明する。     Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の実施例におけるオルダム継手を示す斜視図である。
図１において、本発明のオルダム継手３は、従来のオルダム継手１３と同様に、軸端が相対向する２つの回転軸、例えばモータの回転軸としての第１の回転軸１と、エンコーダの回転軸としての第２の回転軸２の間に介在され、両軸端に取り付けられるハブ４，５と、前記ハブ４，５間に配置され、両ハブ４，５と嵌合する中間継手６とからなっているが、その構成は大きく異なっている。
前記ハブ４，５は、中央部に前記回転軸１，２に嵌合する中央孔４ａ，５ａを有し、前記中央孔４ａ，５ａの径方向両側に凹部４ｂ，５ｂを有している。前記凹部４ｂ，５ｂの両側には側壁４ｃ，５ｃがあり、全体としてＨ字状に構成されている。前記凹部４ｂ，５ｂは、ハブ４，５を回転軸１，２に取り付けたときに回転軸１，２の前方ではなく、上方に位置することになり、中央孔４ａ，５ａと並設されることになるので、従来のようにオルダム継手３の軸方向長さとしてプラスされることはない。
また、前記中間継手６は、平板部６ａの両面の前記ハブ４，５の凹部４ｂ，５ｂと対応する部分に凸部６ｂ，６ｃを有している。前記両面の凸部６ｂ，６ｃは、一方の面の両端部の２つの凸部６ｂと６ｂを結ぶ直線（中央部を横切る線）と、他方の面の２つの凸部６ｃ，６ｃを結ぶ直線（中央部を横切る線）とが十字に交差する位置関係にある。また、前記凸部６ｂ，６ｃにはスリット６ｄ，６ｅが形成されている。
さらに、前記中間継手６には、それぞれの面の前記凸部６ｂ，６ｃの両側に梁６ｆ，６ｇを設けている。これらの梁６ｆ，６ｇは、裏面に凸部６ｃ，６ｂが位置している。平板状のものに凸部を設けるものでは、軸方向の寸法を抑えるためにはベースとなる平板部の厚みを薄くしなければならず、強度的に弱くなってしまうが、本発明における中間継手６は、凸部６ｂ，６ｃの裏面に梁６ｆ，６ｇを構成するようにしているので、中間継手６が同じ軸方向長さであっても、片方の梁６ｆ，６ｇの分だけベースとなる平板部６ａの厚みを大きくすることができ、強度が向上する。中間継手６の平板部６ａを側面から見ると、両側の梁６ｆ，６ｇが張り出した千鳥状をしている。
このような構成において、第１の回転軸１と第２の回転軸２を連結する場合は、前記第１の回転軸１と第２の回転軸２の先端を、ハブ４，５の中央孔４ａ，５ａに嵌合させて、第１および第２の回転軸１，２にハブ４，５を取り付けるとともに、前記ハブ４の凹部４ｂを前記中間継手６の凸部６ｂに嵌合し、かつ、前記ハブ５の凹部５ｂを前記中間継手６の凸部６ｃに嵌合させる。
この際、中間継手６の凸部６ｂ，６ｃは、ガタ無くハブ４，５の凹部４ｂ，５ｂに嵌合するが、前記中間継手６の凸部６ｂ，６ｃは、スリット６ｄ，６ｅが形成されて２山構造になっており、柔軟性があって、嵌合時に２山が内側に倒れてハブ４，５の凹部４ｂ，５ｂに強く圧入するようなことがない。また、ハブ４，５の凹部４ｂ，５ｂの両側には側壁４ｃ，５ｃがあるが、大きな部材ではないので弾力性があり、中間継手６の凸部６ｂ，６ｃがハブ４，５の凹部４ｂ，５ｂに嵌合する際には、凸部６ｂ，６ｃと凹部４ｂ，５ｂの寸法のばらつきによっては、少し倒れて凸部６ｂ，６ｃと凹部４ｂ，５ｂの嵌合を和らげることができる。
なお、中間継手６の凸部６ｂと梁６ｆとの間には凹部６ｈが形成され、また、凸部６ｃと梁６ｇとの間には凹部６ｉが形成され、この凹部６ｈ，６ｉの部分にハブ４，５の側壁４ｃ，５ｃが入り込むが、前記凹部６ｈ，６ｉの周方向の寸法、つまり、凹部６ｈ，６ｉの幅は、ハブ４，５の側壁４ｃ，５ｃの厚みの寸法よりも大きくしているので、側壁４ｃ，５ｃの弾力性が損なわれることはない。つまり、倒れにくくなることはない。
以下、第１の回転軸１から第２の回転軸２への回転の伝達について説明する。
モータの回転軸である第１の回転軸１が回転すると、前記第１の回転軸１の先端に取り付けられているハブ４も、第１の回転軸１とともに回転する。また、それに伴って、前記第１の回転軸１側の凸部６ｂが前記ハブ４の凹部４ｂに嵌合している中間継手６も回転する。また、前記中間継手６の回転に伴って、前記凹部５ｂが前記中間継手６の凸部６ｃに嵌合しているハブ５が回転し、これにより前記ハブ５を軸端に取り付けているエンコーダの回転軸である第２の回転軸２が回転する。
この際、第１の回転軸１と第２の回転軸２の軸心が一致して偏心量及び、偏角量がゼロの場合は、オルダム継手３は、軸間の偏心及び、偏角を吸収する必要がないので、前記中間継手６が動くことなく第１の回転軸１の回転を第２の回転軸２に伝達する。
また、第１の回転軸１と第２の回転軸２の軸心が一致しておらず偏心している場合は、オルダム継手３は、中間継手６の両凸部６ｂ，６ｃがハブ４，５の凹部４ｂ，５ｂ内をスライドして偏心を吸収し、第１の回転軸１の回転を第２の回転軸２に伝達する。
また、第１の回転軸１と第２の回転軸２の軸心が一致しておらず偏角している場合も、オルダム継手３は、中間継手６の両凸部６ｂ，６ｃがハブ４，５の凹部４ｂ，５ｂ内をスライドして偏角を吸収し、第１の回転軸１の回転を第２の回転軸２に伝達する。 FIG. 1 is a perspective view showing an Oldham coupling in an embodiment of the present invention.
In FIG. 1, an Oldham coupling 3 according to the present invention is similar to a conventional Oldham coupling 13 in that two rotating shafts whose shaft ends face each other, for example, a first rotating shaft 1 as a rotating shaft of a motor, and the rotation of an encoder. A hub 4, 5 interposed between the second rotary shafts 2 as shafts and attached to both shaft ends, and an intermediate joint 6 disposed between the hubs 4, 5 and fitted to both hubs 4, 5; However, the configuration is very different.
The hubs 4 and 5 have center holes 4a and 5a that fit into the rotary shafts 1 and 2 at the center, and recesses 4b and 5b on both radial sides of the center holes 4a and 5a. Side walls 4c and 5c are provided on both sides of the recesses 4b and 5b, respectively, and are formed in an H shape as a whole. When the hubs 4 and 5 are attached to the rotary shafts 1 and 2, the concave portions 4b and 5b are positioned not on the front of the rotary shafts 1 and 2 but on the upper side, and are arranged in parallel with the central holes 4a and 5a. Therefore, it is not added as the axial length of the Oldham joint 3 as in the prior art.
The intermediate joint 6 has convex portions 6b and 6c at portions corresponding to the concave portions 4b and 5b of the hubs 4 and 5 on both surfaces of the flat plate portion 6a. The convex portions 6b and 6c on both sides are a straight line connecting the two convex portions 6b and 6b at both ends of one surface (a line crossing the central portion) and a straight line connecting the two convex portions 6c and 6c on the other surface. (A line that crosses the center) and the cross intersect. In addition, slits 6d and 6e are formed in the convex portions 6b and 6c.
Further, the intermediate joint 6 is provided with beams 6f and 6g on both sides of the convex portions 6b and 6c on the respective surfaces. These beams 6f and 6g have convex portions 6c and 6b located on the back surface. In the case where a convex portion is provided on a flat plate, the thickness of the flat plate portion serving as a base must be reduced in order to suppress the axial dimension, and the strength is weakened. 6 is configured such that the beams 6f and 6g are formed on the back surfaces of the convex portions 6b and 6c, so that even if the intermediate joint 6 has the same axial length, it becomes a base by the amount of one of the beams 6f and 6g. The thickness of the flat plate portion 6a can be increased, and the strength is improved. When the flat plate portion 6a of the intermediate joint 6 is viewed from the side, the beams 6f and 6g on both sides are projected in a zigzag shape.
In such a configuration, when the first rotary shaft 1 and the second rotary shaft 2 are connected, the tips of the first rotary shaft 1 and the second rotary shaft 2 are connected to the central holes of the hubs 4 and 5. 4a and 5a are fitted, the hubs 4 and 5 are attached to the first and second rotary shafts 1 and 2, the concave portion 4b of the hub 4 is fitted to the convex portion 6b of the intermediate joint 6, and The concave portion 5b of the hub 5 is fitted into the convex portion 6c of the intermediate joint 6.
At this time, the convex portions 6b and 6c of the intermediate joint 6 are fitted to the concave portions 4b and 5b of the hubs 4 and 5 without play, but the convex portions 6b and 6c of the intermediate joint 6 are formed with slits 6d and 6e. The two-crest structure is flexible, and there is no possibility that the two crests will fall inward and be strongly pressed into the recesses 4b and 5b of the hubs 4 and 5 when fitted. Moreover, although there are side walls 4c and 5c on both sides of the recesses 4b and 5b of the hubs 4 and 5, they are elastic because they are not large members, and the projections 6b and 6c of the intermediate joint 6 are the recesses 4b of the hubs 4 and 5. , 5b, depending on variations in the dimensions of the projections 6b, 6c and the recesses 4b, 5b, the fitting between the projections 6b, 6c and the recesses 4b, 5b can be eased.
A concave portion 6h is formed between the convex portion 6b of the intermediate joint 6 and the beam 6f, and a concave portion 6i is formed between the convex portion 6c and the beam 6g. The side walls 4c and 5c of the hubs 4 and 5 enter, but the circumferential dimension of the recesses 6h and 6i, that is, the width of the recesses 6h and 6i is larger than the thickness dimension of the side walls 4c and 5c of the hubs 4 and 5. Therefore, the elasticity of the side walls 4c and 5c is not impaired. In other words, it does not become difficult to collapse.
Hereinafter, transmission of rotation from the first rotating shaft 1 to the second rotating shaft 2 will be described.
When the first rotating shaft 1 that is the rotating shaft of the motor rotates, the hub 4 attached to the tip of the first rotating shaft 1 also rotates together with the first rotating shaft 1. Along with this, the intermediate joint 6 in which the convex portion 6 b on the first rotating shaft 1 side is fitted in the concave portion 4 b of the hub 4 also rotates. Further, as the intermediate joint 6 rotates, the hub 5 in which the concave portion 5b is fitted to the convex portion 6c of the intermediate joint 6 rotates, and thereby the encoder of the encoder that attaches the hub 5 to the shaft end. The 2nd rotating shaft 2 which is a rotating shaft rotates.
At this time, when the shaft centers of the first rotating shaft 1 and the second rotating shaft 2 coincide with each other and the amount of eccentricity and the amount of declination are zero, the Oldham joint 3 has the eccentricity and declination between the shafts. Since it is not necessary to absorb, the rotation of the first rotating shaft 1 is transmitted to the second rotating shaft 2 without the intermediate joint 6 moving.
When the first rotating shaft 1 and the second rotating shaft 2 do not coincide with each other and are eccentric, the Oldham joint 3 has both convex portions 6b, 6c of the intermediate joint 6 as the hubs 4, 5 The recesses 4b and 5b are slid to absorb the eccentricity, and the rotation of the first rotating shaft 1 is transmitted to the second rotating shaft 2.
Further, even when the shaft centers of the first rotating shaft 1 and the second rotating shaft 2 do not coincide with each other and are deviated, the Oldham joint 3 has both the convex portions 6b and 6c of the intermediate joint 6 formed by the hub 4. , 5 are slid in the recesses 4b, 5b to absorb the declination and transmit the rotation of the first rotating shaft 1 to the second rotating shaft 2.

本発明の実施例におけるオルダム継手を示す斜視図である。It is a perspective view which shows the Oldham coupling in the Example of this invention. 従来技術におけるオルダム継手を示す斜視図である。It is a perspective view which shows the Oldham coupling in a prior art.

符号の説明Explanation of symbols

１ 第１の回転軸
２ 第２の回転軸
３ オルダム継手（本発明）
４ ハブ（第１回転軸側）
４ａ 中央孔
４ｂ 凹部
４ｃ 側壁
５ ハブ（第２回転軸側）
５ａ 中央孔
５ｂ 凹部
５ｃ 側壁
６ 中間継手
６ａ 平板部
６ｂ，６ｃ 凸部
６ｄ，６ｅ スリット
６ｆ，６ｇ 梁
６ｈ，６ｉ 凹部
１３ オルダム継手（従来）
１４ ハブ（第１回転軸側）
１４ｂ 凹部
１５ ハブ（第２回転軸側）
１５ａ 中央孔
１５ｂ 凹部
１６ 中間継手
１６ａ 平板部
１６ｂ，１６ｃ 凸部 DESCRIPTION OF SYMBOLS 1 1st rotating shaft 2 2nd rotating shaft 3 Oldham coupling (this invention)
4 Hub (first rotating shaft side)
4a Central hole 4b Recess 4c Side wall 5 Hub (second rotating shaft side)
5a Central hole 5b Recess 5c Side wall 6 Intermediate joint 6a Flat plate 6b, 6c Projection 6d, 6e Slit 6f, 6g Beam 6h, 6i Recess 13 Oldham joint (conventional)
14 Hub (first rotating shaft side)
14b Concave portion 15 Hub (second rotating shaft side)
15a Central hole 15b Concave part 16 Intermediate joint 16a Flat plate part 16b, 16c Convex part

Claims (3)

軸端が相対向する２つの回転軸間に介在され、一方の回転軸の回転力を他方の回転軸へ回転伝達するオルダム継手において、
前記オルダム継手が、
前記両軸端に取り付けられたハブと、
前記ハブ間に配置され、両ハブと嵌合する中間継手とからなり、
前記ハブは、前記回転軸に嵌合する中央孔と、前記中央孔の径方向両側に凹部を有するＨ字状に構成され、
前記中間継手は、両面の前記ハブの凹部と対応する部分に、凸部を有するとともに、前記両面の凸部は、片面の凸部どおしを結ぶ直線が十字に交差する位置関係にあり、かつ、前記凸部にスリットを有して構成されていることを特徴とするオルダム継手。 In the Oldham coupling, whose shaft end is interposed between two rotating shafts facing each other, and which transmits the rotational force of one rotating shaft to the other rotating shaft,
The Oldham coupling is
A hub attached to both shaft ends;
An intermediate joint that is disposed between the hubs and fits with both hubs,
The hub is configured in an H shape having a central hole that fits into the rotating shaft, and concave portions on both radial sides of the central hole,
The intermediate joint has a convex portion at a portion corresponding to the concave portion of the hub on both sides, and the convex portions on the both sides are in a positional relationship in which a straight line connecting the convex portions on one side intersects the cross, And the Oldham coupling characterized by having a slit in the said convex part. 前記中間継手が、それぞれの面の前記凸部の両側に梁を設けて構成されていることを特徴とする請求項１に記載のオルダム継手。   The Oldham joint according to claim 1, wherein the intermediate joint is configured by providing beams on both sides of the convex portion of each surface. モータの回転軸に一方のハブを嵌合取り付けし、エンコーダの回転軸に他方のハブを嵌合取り付けし、前記両ハブを中間継手で連結したオルダムを備えたエンコーダ付モータにおいて、
前記オルダム継手を、請求項１または２に記載のオルダム継手で構成したことを特徴とするエンコーダ付モータ。 In a motor with an encoder provided with an Oldham in which one hub is fitted and attached to the rotating shaft of the motor, the other hub is fitted and attached to the rotating shaft of the encoder, and both hubs are connected by an intermediate joint.
A motor with an encoder, wherein the Oldham joint is constituted by the Oldham joint according to claim 1.
JP2006111106A 2006-04-13 2006-04-13 Oldham coupling and motor with encoder having same Pending JP2007285356A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010019274A (en) * 2008-07-08 2010-01-28 Koda:Kk Pack type valve
US7985140B2 (en) 2008-10-03 2011-07-26 Ford Global Technologies Zero-lash Oldham coupling
CN102649271A (en) * 2011-02-23 2012-08-29 株式会社安川电机 Robot, robot system, and rotating electrical machine
DE102013004888A1 (en) 2012-03-28 2013-10-02 Fanuc Corporation Oldham clutch, manufacturing process for this, coupling process of shafts through the Oldham clutch and electric motor, which includes the Oldham clutch
CN103378691A (en) * 2012-04-18 2013-10-30 株式会社安川电机 Rotating electric machine
US11047424B2 (en) 2017-01-12 2021-06-29 Jeco Co., Ltd. Oldham coupling
WO2021261421A1 (en) * 2020-06-25 2021-12-30 ファナック株式会社 Motor with electromagnetic brake

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010019274A (en) * 2008-07-08 2010-01-28 Koda:Kk Pack type valve
US7985140B2 (en) 2008-10-03 2011-07-26 Ford Global Technologies Zero-lash Oldham coupling
CN102649271A (en) * 2011-02-23 2012-08-29 株式会社安川电机 Robot, robot system, and rotating electrical machine
JP2012171072A (en) * 2011-02-23 2012-09-10 Yaskawa Electric Corp Robot, robot system, and rotating electrical machine
DE102013004888A1 (en) 2012-03-28 2013-10-02 Fanuc Corporation Oldham clutch, manufacturing process for this, coupling process of shafts through the Oldham clutch and electric motor, which includes the Oldham clutch
US8736120B2 (en) 2012-03-28 2014-05-27 Fanuc Corporation Oldham coupling, manufacturing process thereof, coupling process of shafts by oldham coupling and electric motor including oldham coupling
CN103378691A (en) * 2012-04-18 2013-10-30 株式会社安川电机 Rotating electric machine
US11047424B2 (en) 2017-01-12 2021-06-29 Jeco Co., Ltd. Oldham coupling
WO2021261421A1 (en) * 2020-06-25 2021-12-30 ファナック株式会社 Motor with electromagnetic brake

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