JP2015036163A - Balance weight device - Google Patents

Balance weight device Download PDF

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JP2015036163A
JP2015036163A JP2013168013A JP2013168013A JP2015036163A JP 2015036163 A JP2015036163 A JP 2015036163A JP 2013168013 A JP2013168013 A JP 2013168013A JP 2013168013 A JP2013168013 A JP 2013168013A JP 2015036163 A JP2015036163 A JP 2015036163A
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gear
stage
peripheral surface
housing
mysterious
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JP6109009B2 (en
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片野　圭二
Keiji Katano
圭二 片野
裕二 小川
Yuji Ogawa
裕二 小川
勝哉 河野
Katsuya Kono
勝哉 河野
健次 宮地
Kenji Miyaji
健次 宮地
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OMIYA IND CO Ltd
Icomes Lab Co Ltd
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OMIYA IND CO Ltd
Icomes Lab Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To make it possible to obtain a higher speed reduction ratio and to increase a maintenance performance without enlarging a size of a device.SOLUTION: Screw grooves 121a, 161a are provided between a peripheral surface of a first front stage outer gear 12, which becomes a stationery side of a front stage wondrous gear mechanism 10 and a peripheral surface of a front stage housing 16, the first front stage outer gear 12 and the front stage housing 16 are engaged with each other by the screw grooves 121a, 161a, screw grooves 162a, 222b are provided between a peripheral surface of a first latter stage outer gear 22, which becomes a stationery side of a latter stage wondrous gear mechanism 20 and the peripheral surface of the front stage housing 16, the first latter stage outer gear 22 and the front stage housing 16 are engaged with each other by the screw grooves 162a, 222b, screw grooves 222a, 261a are provided between a peripheral surface of a latter stage housing 26 and a peripheral surface of the first latter stage outer gear 22, and the latter stage housing 26 and the first latter stage outer gear 22 are engaged with each other by the screw grooves 222a, 261a.

Description

本発明は、バランスウエイト装置に関するものである。   The present invention relates to a balance weight device.

研削盤や旋盤等のように工具もしくは加工対象物を回転させた状態で加工を行う工作機械においては、回転時にアンバランスが発生すると加工精度に大きな影響を及ぼす恐れがある。このため、この種の工作機械には、バランスウエイト装置が付設されている場合が多い。バランスウエイト装置は、工作機械の主軸を中心として回転可能に配設されたバランスウエイトと、動力源となる電動モータとの間に減速装置を備えて構成されたものが一般的である。減速装置は、遊星歯車機構を備えて構成されており、電動モータの回転を減速してバランスウエイトに伝達するものである。   In a machine tool that performs machining with a tool or a workpiece to be rotated, such as a grinding machine or a lathe, if unbalance occurs during rotation, the machining accuracy may be greatly affected. For this reason, this type of machine tool is often provided with a balance weight device. The balance weight device is generally configured to include a speed reducer between a balance weight disposed so as to be rotatable about a main axis of a machine tool and an electric motor serving as a power source. The reduction gear is configured to include a planetary gear mechanism, and reduces the rotation of the electric motor and transmits it to the balance weight.

このバランスウエイト装置では、電動モータの駆動により減速装置を介してバランスウエイトの位置を変化させることにより、回転時のアンバランスを打ち消すことができるようになる。減速装置としては、より高い減速比を得るために、例えば、特許文献１に記載されているように、複数段の遊星歯車機構を直列に接続するようにしたものを適用することも可能である。   In this balance weight device, the unbalance at the time of rotation can be canceled by changing the balance weight position via the speed reducer by driving the electric motor. In order to obtain a higher reduction ratio, for example, as described in Patent Document 1, it is also possible to apply a reduction gear that has a plurality of planetary gear mechanisms connected in series. .

特開平６−３３７０４３号公報JP-A-6-337043

ところで、遊星歯車機構の外周部に設けられるハウジングは、遊星歯車機構のメインテナンスを考慮した場合、電動モータのケーシングに対して着脱可能に取り付けられていることが好ましい。例えば、特許文献１に記載されているように、ハウジングに設けたネジ孔を介して電動モータのケーシングに取付ネジを螺合させることにより、ケーシングにハウジングを取り付けるようにした減速装置によれば、取付ネジを弛緩させることでハウジングを取り外すことができ、内部の遊星歯車機構に対してメインテナンス作業を容易に行うことが可能となる。   By the way, it is preferable that the housing provided in the outer peripheral part of the planetary gear mechanism is detachably attached to the casing of the electric motor in consideration of maintenance of the planetary gear mechanism. For example, as described in Patent Document 1, according to the reduction gear device that attaches the housing to the casing by screwing the attachment screw into the casing of the electric motor through the screw hole provided in the housing. By loosening the mounting screws, the housing can be removed, and maintenance work can be easily performed on the internal planetary gear mechanism.

しかしながら、取付ネジによってハウジングをケーシングに取り付けた場合には、ネジ孔を設けるためのスペース分だけハウジングの外形寸法を大きく構成せざるを得ず、減速装置を適用するバランスウエイト装置の大型化を招来することになる。   However, when the housing is attached to the casing with mounting screws, the outer dimensions of the housing must be increased by the space for providing the screw holes, leading to an increase in the size of the balance weight device to which the reduction gear is applied. Will do.

本発明は、上記実情に鑑みて、装置の大型化を招来することなく、より高い減速比を得ることができ、かつメインテナンス性を向上させることのできるバランスウエイト装置を提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide a balance weight device capable of obtaining a higher reduction ratio without increasing the size of the device and improving maintenance. .

上記目的を達成するため、本発明に係るバランスウエイト装置は、相互に接続された２組の遊星歯車機構を介して回転アクチュエータの駆動軸から与えられる回転を外部に出力することにより、駆動軸の軸心に対するバランスウエイトの位置を変更するようにしたバランスウエイト装置において、２組の遊星歯車機構は、それぞれが互いに歯数の異なる２つのアウタギヤを備えた不思議歯車機構として構成したものであり、前段となる不思議歯車機構において固定側となる前段固定アウタギヤの周面と、前記前段となる不思議歯車機構の外周部を覆う前段ハウジングの周面との間にネジ溝を設け、前記ネジ溝により前記前段固定アウタギヤと前記前段ハウジングとの間を互いに螺合し、後段となる不思議歯車機構において固定側となる後段固定アウタギヤの周面と、前記前段ハウジングの周面との間にネジ溝を設け、前記ネジ溝により前記後段固定アウタギヤと前記前段ハウジングとの間を互いに螺合し、前記後段となる不思議歯車機構の外周部を覆う後段ハウジングの周面と、前記後段固定アウタギヤの周面との間にネジ溝を設け、前記ネジ溝により前記後段ハウジングと前記後段固定アウタギヤとの間を互いに螺合したことを特徴とする。   In order to achieve the above object, the balance weight device according to the present invention outputs the rotation given from the drive shaft of the rotary actuator to the outside via two sets of planetary gear mechanisms connected to each other, thereby In the balance weight device that changes the position of the balance weight with respect to the shaft center, the two sets of planetary gear mechanisms are configured as a strange gear mechanism having two outer gears each having a different number of teeth. A screw groove is provided between the peripheral surface of the front fixed outer gear on the fixed side in the mysterious gear mechanism and the peripheral surface of the front housing that covers the outer periphery of the mysterious gear mechanism that is the front stage, and the front groove is provided by the screw groove. The fixed outer gear and the front housing are screwed together to fix the rear stage fixed on the fixed side in the magic gear mechanism on the rear stage. A screw groove is provided between the outer peripheral surface of the outer gear and the peripheral surface of the front housing, and the rear fixed outer gear and the front housing are screwed together by the screw groove, so that the wonder gear mechanism of the rear gear is formed. A screw groove is provided between the peripheral surface of the rear housing that covers the outer periphery and the peripheral surface of the rear fixed outer gear, and the rear housing and the rear fixed outer gear are screwed together by the screw groove. And

また、本発明は、上述したバランスウエイト装置において、それぞれの不思議歯車機構においては、固定アウタギヤの外周面と当該不思議歯車機構の外周部を覆うハウジングの内周面との間にネジ溝を形成し、かつ前段の不思議歯車機構と後段の不思議歯車機構との間においては、前記後段固定アウタギヤの内周面と前記前段ハウジングの外周面との間にネジ溝を形成したことを特徴とする。   Further, according to the present invention, in each of the above-described balance weight devices, a screw groove is formed between the outer peripheral surface of the fixed outer gear and the inner peripheral surface of the housing that covers the outer peripheral portion of the strange gear mechanism. In addition, a screw groove is formed between the inner peripheral surface of the rear-stage fixed outer gear and the outer peripheral surface of the front-stage housing between the front-stage mysterious gear mechanism and the rear-stage mysterious gear mechanism.

本発明によれば、別途取付ネジを要することなくそれぞれの連結部分にネジ溝を設けて互いに螺合させるようにしたため、各連結部分にネジ孔を設けるためのスペースが不要となり、装置の大型化を招来することなく、より高い減速比を得ることができ、かつメインテナンス性を向上させることが可能になる。   According to the present invention, since a screw groove is provided in each connecting portion and screwed together without requiring a separate mounting screw, a space for providing a screw hole in each connecting portion becomes unnecessary, and the size of the apparatus is increased. Therefore, a higher reduction ratio can be obtained and maintenance can be improved.

図１は、本発明の実施の形態であるバランスウエイト装置の断面側面図である。FIG. 1 is a cross-sectional side view of a balance weight device according to an embodiment of the present invention. 図２は、図１に示したバランスウエイト装置の分解断面側面図である。2 is an exploded cross-sectional side view of the balance weight device shown in FIG. 図３は、図１に示したバランスウエイト装置の外観斜視図である。3 is an external perspective view of the balance weight device shown in FIG.

以下に添付図面を参照して、本発明に係るバランスウエイト装置の好適な実施の形態について詳細に説明する。   Exemplary embodiments of a balance weight device according to the present invention will be explained below in detail with reference to the accompanying drawings.

図１〜図３は、本発明の実施の形態であるバランスウエイト装置を示したものである。ここで例示するバランスウエイト装置は、図には明示していないが、研削盤や旋盤等のように工具もしくは加工対象物を回転させた状態で加工を行う工作機械の主軸に付設され、回転時のアンバランスを抑えるように機能するもので、回転アクチュエータである電動モータＭの回転を減速するための２組の不思議歯車機構１０，２０を備えている。２組の不思議歯車機構１０，２０は、図１及び図２に示すように、それぞれがサンギヤ１１，２１、第１アウタギヤ１２，２２、第２アウタギヤ１３，２３及び複数のプラネタリギヤ１４，２４を備えて構成したものである。   1 to 3 show a balance weight device according to an embodiment of the present invention. The balance weight device illustrated here is not explicitly shown in the figure, but is attached to the spindle of a machine tool that performs machining with a tool or object to be rotated, such as a grinding machine or a lathe. Are provided with two sets of mysterious gear mechanisms 10 and 20 for decelerating the rotation of the electric motor M, which is a rotary actuator. As shown in FIGS. 1 and 2, the two sets of the strange gear mechanisms 10 and 20 include sun gears 11 and 21, first outer gears 12 and 22, second outer gears 13 and 23, and a plurality of planetary gears 14 and 24, respectively. It is configured.

サンギヤ１１，２１は、各不思議歯車機構１０，２０の中心部に位置した小径の歯車であり、その外周に設けた歯に複数のプラネタリギヤ１４，２４が歯合している。プラネタリギヤ１４，２４は、プラネタリキャリヤ１５，２５に支持させてあり、個々の軸心回りに回転（自転）可能、かつサンギヤ１１，２１の軸心を中心として公転することが可能である。第１アウタギヤ１２，２２及び第２アウタギヤ１３，２３は、それぞれの内周面に歯を有した円環状を成すもので、個々の歯がプラネタリギヤ１４，２４に歯合している。図には明示していないが、第１アウタギヤ１２，２２及び第２アウタギヤ１３，２３は、互いに歯数が異なるように構成してある。   The sun gears 11 and 21 are small-diameter gears positioned at the center of each of the mysterious gear mechanisms 10 and 20, and a plurality of planetary gears 14 and 24 mesh with teeth provided on the outer periphery thereof. The planetary gears 14 and 24 are supported by the planetary carriers 15 and 25, can be rotated (rotated) around the respective axis centers, and can revolve around the axis centers of the sun gears 11 and 21. The first outer gears 12, 22 and the second outer gears 13, 23 form an annular shape having teeth on their inner peripheral surfaces, and individual teeth mesh with the planetary gears 14, 24. Although not clearly shown in the drawing, the first outer gears 12 and 22 and the second outer gears 13 and 23 are configured to have different numbers of teeth.

一方の不思議歯車機構（前段の不思議歯車機構）１０は、電動モータＭからの回転が直接入力される前段となるものであり、他方の不思議歯車機構（後段の不思議歯車機構）２０は、一方の不思議歯車機構１０によって減速された後の回転をさらに減速して外部に出力する後段となるものである。以下において２組の不思議歯車機構１０，２０及びその構成要素１１，１２，１３，１４，１５，２１，２２，２３，２４，２５を区別する場合には、前段となる不思議歯車機構１０及びその構成要素１１，１２，１３，１４，１５に対してそれぞれの名称の先頭に「前段」という用語を付与し、後段となる不思議歯車機構２０及びその構成要素２１，２２，２３，２４，２５に対してそれぞれの名称の先頭に「後段」という用語を付与することとする。   One mysterious gear mechanism (front-stage mysterious gear mechanism) 10 is a front stage to which rotation from the electric motor M is directly input, and the other mysterious gear mechanism (second-stage mysterious gear mechanism) 20 This is the latter stage where the rotation after being decelerated by the mysterious gear mechanism 10 is further decelerated and output to the outside. In the following, when the two sets of the wonder gear mechanisms 10 and 20 and their constituent elements 11, 12, 13, 14, 15, 21, 21, 22, 23, 24, and 25 are distinguished, the wonder gear mechanism 10 as the preceding stage and its The term “front stage” is given to the heads of the names of the constituent elements 11, 12, 13, 14, and 15, so On the other hand, the term “subsequent” is given to the head of each name.

前段不思議歯車機構１０では、前段サンギヤ１１が電動モータＭの駆動軸ｍに取り付けてあるとともに、前段第１アウタギヤ（前段固定アウタギヤ）１２が電動モータＭのケーシングＭＣに取り付けてある。   In the front stage mysterious gear mechanism 10, the front stage sun gear 11 is attached to the drive shaft m of the electric motor M, and the front stage first outer gear (front stage fixed outer gear) 12 is attached to the casing MC of the electric motor M.

前段第１アウタギヤ１２の取付対象となる電動モータＭのケーシングＭＣは、駆動軸ｍが突出する本体ケースＭＣ１の先端部に取付プレートＭＣ２を備えたものである。取付プレートＭＣ２は、中心部に挿通孔Ｈを有し、かつ先端部の外周面に保持用外周ネジ溝ｎを有した略円板状を成すもので、複数の固定ネジＢを介して電動モータＭの本体ケースＭＣ１に固定してある。保持用外周ネジ溝ｎは、取付プレートＭＣ２を軸心周りに回転させた場合に螺進するように形成したものである。   The casing MC of the electric motor M to which the first outer gear 12 is attached is provided with a mounting plate MC2 at the tip of the main body case MC1 from which the drive shaft m protrudes. The mounting plate MC2 has a substantially disk shape having an insertion hole H in the center and a holding outer peripheral thread groove n on the outer peripheral surface of the tip, and the electric motor is connected via a plurality of fixing screws B. It is fixed to the M body case MC1. The holding outer peripheral thread groove n is formed so as to be screwed when the mounting plate MC2 is rotated around the axis.

前段第１アウタギヤ１２は、内周面に歯を有した円環状を成す前段第１ギヤ本体１２１と、前段第１ギヤ本体１２１を保持する前段第１ギヤ保持体１２２とを備えたものである。前段第１ギヤ保持体１２２は、略円筒状を成し、先端部の外周面に前段ハウジング用外周ネジ溝１２１ａを有しているとともに、基端部の内周面にモータ用内周ネジ溝１２１ｂを有したものである。上述した前段第１ギヤ本体１２１は、前段第１ギヤ保持体１２２の先端部内周面に固着してある。前段ハウジング用外周ネジ溝１２１ａ及びモータ用内周ネジ溝１２１ｂは、前段第１ギヤ保持体１２２を円筒の軸心周りに回転させた場合に螺進するように形成したものである。この前段第１アウタギヤ１２は、前段第１ギヤ保持体１２２の基端部に設けたモータ用内周ネジ溝１２１ｂを取付プレートＭＣ２の保持用外周ネジ溝ｎに螺合させることにより、電動モータＭのケーシングＭＣに保持させてある。   The front-stage first outer gear 12 includes a front-stage first gear main body 121 that forms an annular shape with teeth on the inner peripheral surface, and a front-stage first gear holding body 122 that holds the front-stage first gear main body 121. . The front first gear holding body 122 has a substantially cylindrical shape, and has a front housing outer peripheral thread groove 121a on the outer peripheral surface of the front end portion, and an inner peripheral thread groove for motor on the inner peripheral surface of the base end portion. 121b. The above-described first-stage first gear main body 121 is fixed to the inner peripheral surface of the front end portion of the first-stage first gear holding body 122. The outer peripheral screw groove 121a for the front housing and the inner peripheral screw groove 121b for the motor are formed so as to be screwed when the front first gear holding body 122 is rotated around the axis of the cylinder. The front-stage first outer gear 12 is configured such that the motor inner peripheral thread groove 121b provided at the base end portion of the front-stage first gear holding body 122 is screwed into the holding outer peripheral thread groove n of the mounting plate MC2, whereby the electric motor M The casing MC is held.

前段第１アウタギヤ１２には、前段不思議歯車機構１０の外周部を覆う態様で前段ハウジング（前段ハウジング）１６が取り付けてある。前段ハウジング１６は、太径の略円筒状を成す前段ハウジング基部１６１と、前段ハウジング基部１６１よりも細径の略円筒状を成し、前段ハウジング基部１６１の先端部に連設した前段ギヤ支持部１６２とを一体に成形したものである。この前段ハウジング１６は、前段ハウジング基部１６１の基端部内周面に形成した前段ハウジング内周ネジ溝１６１ａを前段ハウジング用外周ネジ溝１２１ａに螺合させることによって前段第１アウタギヤ１２に保持させてある。前段ギヤ支持部１６２の先端部外周面には、前段ハウジング１６を円筒の軸心周りに回転させた場合に螺進するように第２ギヤ用外周ネジ溝１６２ａが設けてある。   A front housing (front housing) 16 is attached to the front first outer gear 12 so as to cover the outer periphery of the front mysterious gear mechanism 10. The front housing 16 includes a front housing base 161 having a substantially cylindrical shape with a large diameter, and a front gear support portion having a substantially cylindrical shape with a diameter smaller than that of the front housing base 161 and continuously provided at the tip of the front housing base 161. 162 is integrally molded. The front-stage housing 16 is held by the front-stage first outer gear 12 by screwing a front-stage housing inner peripheral thread groove 161a formed on the inner peripheral surface of the base end portion of the front-stage housing base section 161 into the front-stage housing outer peripheral thread groove 121a. . A peripheral gear groove 162a for the second gear is provided on the outer peripheral surface of the front end portion of the front gear support portion 162 so as to be screwed when the front housing 16 is rotated around the axis of the cylinder.

前段不思議歯車機構１０の前段第２アウタギヤ１３は、内周面に歯を有した円環状を成す前段第２ギヤ本体１３１と、前段第２ギヤ本体１３１に取り付けた前段出力軸１３２とを備えて構成したものである。前段出力軸１３２は、前段フランジ部１３２ａ、支持軸部１３２ｂ及び軸本体１３２ｃを互いに同一軸心上となるように一体に成形したもので、前段フランジ部１３２ａを介して前段第２ギヤ本体１３１の先端部内周面に取り付けてある。前段フランジ部１３２ａは、前段ハウジング１６に設けた前段ギヤ支持部１６２の内径よりも太径の円板状を成すものである。支持軸部１３２ｂは、前段ギヤ支持部１６２の内径よりも細径の円柱状を成すもので、前段フランジ部１３２ａの先端面から突出する態様で設けてある。軸本体１３２ｃは、支持軸部１３２ｂよりも細径の円柱状を成すもので、支持軸部１３２ｂの先端面に設けてある。前段出力軸１３２の基端部には、前段サンギヤ１１の軸部１１ａを回転可能に支持するための前段軸受部１３２ｄが設けてある。   The front-stage second outer gear 13 of the front-stage mysterious gear mechanism 10 includes a front-stage second gear main body 131 having an annular shape with teeth on the inner peripheral surface, and a front-stage output shaft 132 attached to the front-stage second gear main body 131. It is composed. The front-stage output shaft 132 is formed by integrally forming the front-stage flange portion 132a, the support shaft portion 132b, and the shaft main body 132c so as to be on the same axis, and the front-stage output shaft 132 is connected to the front-stage second gear main body 131 via the front-stage flange portion 132a. It is attached to the inner peripheral surface of the tip. The front flange portion 132 a has a disk shape that is thicker than the inner diameter of the front gear support portion 162 provided in the front housing 16. The support shaft portion 132b has a columnar shape with a diameter smaller than the inner diameter of the front gear support portion 162, and is provided in a manner protruding from the tip surface of the front flange portion 132a. The shaft main body 132c has a columnar shape with a diameter smaller than that of the support shaft portion 132b, and is provided on the distal end surface of the support shaft portion 132b. At the base end portion of the front output shaft 132, a front bearing portion 132d for rotatably supporting the shaft portion 11a of the front sun gear 11 is provided.

この前段第２アウタギヤ１３は、前段出力軸１３２の軸本体１３２ｃが前段ハウジング１６の前段ギヤ支持部１６２から外部に突出し、かつ前段第２ギヤ本体１３１が前段ハウジング基部１６１に収容された状態で、支持軸部１３２ｂと前段ギヤ支持部１６２との間に介在させたベアリングｂ１により前段ハウジング１６に回転可能に支持させてある。前段出力軸１３２の前段軸受部１３２ｄには、ベアリングｂ２を介して前段サンギヤ１１の軸部１１ａが回転可能に配設してある。   The front-stage second outer gear 13 is in a state where the shaft main body 132c of the front-stage output shaft 132 protrudes outside from the front-stage gear support portion 162 of the front-stage housing 16, and the front-stage second gear main body 131 is accommodated in the front-stage housing base 161. The front housing 16 is rotatably supported by a bearing b1 interposed between the support shaft portion 132b and the front gear support portion 162. A shaft portion 11a of the front sun gear 11 is rotatably disposed on the front bearing portion 132d of the front output shaft 132 via a bearing b2.

後段不思議歯車機構２０では、後段サンギヤ２１が前段ハウジング１６から突出する前段第２アウタギヤ１３の前段出力軸１３２に取り付けてあるとともに、後段第１アウタギヤ（後段固定アウタギヤ）２２が前段ハウジング１６の前段ギヤ支持部１６２に取り付けてある。   In the rear stage mysterious gear mechanism 20, the rear stage sun gear 21 is attached to the front stage output shaft 132 of the front stage second outer gear 13 protruding from the front stage housing 16, and the rear stage first outer gear (rear stage fixed outer gear) 22 is connected to the front stage gear of the front stage housing 16. It is attached to the support part 162.

後段第１アウタギヤ２２は、内周面に歯を有した円環状を成す後段第１ギヤ本体２２１と、後段第１ギヤ本体２２１を保持する後段第１ギヤ保持体２２２とを備えたものである。後段第１ギヤ保持体２２２は、略円筒状を成し、先端部の外周面に後段ハウジング用外周ネジ溝２２２ａを有しているとともに、基端部の内周面に前段ハウジング用内周ネジ溝２２２ｂを有したものである。上述した後段第１ギヤ本体２２１は、後段第１ギヤ保持体２２２の先端部内周面に固着してある。後段ハウジング用外周ネジ溝２２２ａ及び前段ハウジング用内周ネジ溝２２２ｂは、後段第１ギヤ保持体２２２を円筒の軸心周りに回転させた場合に螺進するように形成したものである。この後段第１アウタギヤ２２は、後段第１ギヤ保持体２２２の基端部に設けた前段ハウジング用内周ネジ溝２２２ｂを前段ハウジング１６の前段ギヤ支持部１６２に設けた第２ギヤ用外周ネジ溝１６２ａに螺合させることにより、前段ハウジング１６に保持させてある。   The rear-stage first outer gear 22 includes a rear-stage first gear main body 221 that forms an annular shape having teeth on the inner peripheral surface, and a rear-stage first gear holding body 222 that holds the rear-stage first gear main body 221. . The rear first gear holder 222 has a substantially cylindrical shape, and has a rear housing outer peripheral thread groove 222a on the outer peripheral surface of the distal end portion, and an inner peripheral screw for the front housing on the inner peripheral surface of the base end portion. A groove 222b is provided. The above-described first-stage first gear main body 221 is fixed to the inner peripheral surface of the front end portion of the first-stage first gear holder 222. The rear housing outer peripheral thread groove 222a and the front housing inner peripheral thread groove 222b are formed so as to be screwed when the rear first gear holder 222 is rotated around the axis of the cylinder. The rear stage first outer gear 22 has a front gear inner peripheral thread groove 222 b provided at the proximal end of the rear stage first gear holder 222 and a second gear outer peripheral thread groove provided in the front gear support part 162 of the front housing 16. It is held by the front housing 16 by being screwed to 162a.

後段第１アウタギヤ２２には、後段不思議歯車機構２０の外周部を覆う態様で後段ハウジング（後段ハウジング）２６が取り付けてある。後段ハウジング２６は、太径の略円筒状を成す後段ハウジング基部２６１と、後段ハウジング基部２６１よりも細径の略円筒状を成し、後段ハウジング基部２６１の先端部に連設した後段ギヤ支持部２６２とを一体に成形したものである。本実施の形態では、後段ハウジング基部２６１の外径が前段ハウジング基部１６１の外径と一致するように構成してある。この後段ハウジング２６は、後段ハウジング基部２６１の基端部内周面に形成した後段ハウジング内周ネジ溝２６１ａを後段ハウジング用外周ネジ溝２２２ａに螺合させることによって後段第１アウタギヤ２２に保持させてある。   A rear housing (rear housing) 26 is attached to the rear first outer gear 22 so as to cover the outer periphery of the rear mysterious gear mechanism 20. The rear housing 26 includes a rear housing base portion 261 having a substantially cylindrical shape with a large diameter, and a rear gear support portion having a substantially cylindrical shape with a diameter smaller than that of the rear housing base portion 261 and connected to the distal end portion of the rear housing base portion 261. 262 is integrally molded. In the present embodiment, the outer diameter of the rear housing base 261 is configured to match the outer diameter of the front housing base 161. The rear housing 26 is held by the rear first outer gear 22 by screwing a rear housing inner peripheral thread groove 261a formed on the inner peripheral surface of the rear end of the rear housing base 261 into the rear housing outer peripheral thread groove 222a. .

後段不思議歯車機構２０の後段第２アウタギヤ２３は、内周面に歯を有した円環状を成す後段第２ギヤ本体２３１と、後段第２ギヤ本体２３１に取り付けた後段出力軸２３２とを備えて構成したものである。後段出力軸２３２は、後段フランジ部２３２ａ及び支持軸本体２３２ｂを互いに同一軸心上となるように一体に成形したもので、後段フランジ部２３２ａを介して後段第２ギヤ本体２３１の先端部内周面に取り付けてある。後段フランジ部２３２ａは、後段ハウジング２６に設けた後段ギヤ支持部２６２の内径よりも太径の円板状を成すものである。支持軸本体２３２ｂは、後段ギヤ支持部２６２の内径よりも細径の円柱状を成すもので、後段フランジ部２３２ａの先端面から突出する態様で設けてある。後段出力軸２３２の基端部には、後段サンギヤ２１を設けた前段出力軸１３２の先端部を回転可能に支持するための後段軸受部２３２ｃが設けてある。   The rear-stage second outer gear 23 of the rear-stage wonder gear mechanism 20 includes a rear-stage second gear main body 231 having an annular shape with teeth on the inner peripheral surface, and a rear-stage output shaft 232 attached to the rear-stage second gear main body 231. It is composed. The rear-stage output shaft 232 is formed by integrally forming the rear-stage flange portion 232a and the support shaft body 232b so as to be on the same axis, and the inner peripheral surface of the front end portion of the second-stage second gear main body 231 via the rear-stage flange portion 232a. It is attached to. The rear flange portion 232 a has a disk shape that is thicker than the inner diameter of the rear gear support portion 262 provided in the rear housing 26. The support shaft main body 232b is formed in a columnar shape having a diameter smaller than the inner diameter of the rear gear support portion 262, and is provided in a manner protruding from the front end surface of the rear flange portion 232a. A rear stage bearing portion 232c for rotatably supporting the distal end portion of the front stage output shaft 132 provided with the rear stage sun gear 21 is provided at the base end portion of the rear stage output shaft 232.

この後段第２アウタギヤ２３は、後段出力軸２３２の支持軸本体２３２ｂが後段ハウジング２６の後段ギヤ支持部２６２から外部に突出し、かつ後段第２ギヤ本体２３１が後段ハウジング基部２６１に収容された状態で、支持軸本体２３２ｂと後段ギヤ支持部２６２との間に介在させたベアリングｂ３により後段ハウジング２６に回転可能に支持させてある。後段出力軸２３２の後段軸受部２３２ｃには、ベアリングｂ４を介して前段出力軸１３２が回転可能に配設してある。尚、図中の符号ＥＣは、後段出力軸２３２に嵌着させた抜け止め部材である。   The rear stage second outer gear 23 is in a state where the support shaft main body 232b of the rear stage output shaft 232 protrudes from the rear stage gear support portion 262 of the rear stage housing 26 and the rear stage second gear main body 231 is accommodated in the rear stage housing base 261. The rear housing 26 is rotatably supported by a bearing b3 interposed between the support shaft body 232b and the rear gear support portion 262. A front stage output shaft 132 is rotatably disposed on a rear stage bearing portion 232c of the rear stage output shaft 232 via a bearing b4. In addition, the code | symbol EC in a figure is the retaining member fitted to the back | latter stage output shaft 232. FIG.

また、後段出力軸２３２には、後段ハウジング２６から突出する支持軸本体２３２ｂの端部にバランスウエイト３０が設けてある。バランスウエイト３０は、後段ハウジング２６及び前段ハウジング１６の外周部を覆う大きさに構成した厚肉の円筒状を成すウエイト部３１と、ウエイト部３１の一端部から円筒の軸心に向けて突出した支持片部３２と備えたもので、支持片部３２を介して支持軸本体２３２ｂに取り付けてあり、支持軸本体２３２ｂと一体に回転することが可能である。   The rear output shaft 232 is provided with a balance weight 30 at the end of the support shaft main body 232 b protruding from the rear housing 26. The balance weight 30 protrudes from one end of the weight portion 31 toward the axial center of the cylinder, and the weight portion 31 has a thick cylindrical shape configured to cover the outer periphery of the rear housing 26 and the front housing 16. It is provided with the support piece portion 32, is attached to the support shaft main body 232b via the support piece portion 32, and can rotate integrally with the support shaft main body 232b.

上記のように構成したバランスウエイト装置では、電動モータＭが駆動し、駆動軸ｍの回転によって前段サンギヤ１１が回転すると、前段第１アウタギヤ１２が電動モータＭのケーシングＭＣに取り付けられているため、前段プラネタリギヤ１４が自転しながら前段サンギヤ１１の軸心回りに公転することになり、前段プラネタリギヤ１４に歯合する前段第２アウタギヤ１３が駆動軸ｍの軸心回りに回転することになる。後段第２アウタギヤ２３の回転によって後段サンギヤ２１が回転すると、後段第１アウタギヤ２２が前段ハウジング１６を介して電動モータＭのケーシングＭＣに取り付けられているため、後段プラネタリギヤ２４が自転しながら後段サンギヤ２１の軸心回りに公転することになり、後段プラネタリギヤ２４に歯合する後段第２アウタギヤ２３が駆動軸ｍの軸心回りに回転する。つまり、電動モータＭを駆動すると、駆動軸ｍの回転が２つの不思議歯車機構１０，２０によって高い減速比で減速され、後段第２アウタギヤ２３から外部出力されることになる。従って、電動モータＭの回転によってバランスウエイト３０の位置を高い精度で変更することができ、主軸（図示せず）の回転時に発生するアンバランスを効果的に抑えることが可能となる。   In the balance weight device configured as described above, when the electric motor M is driven and the front sun gear 11 is rotated by the rotation of the drive shaft m, the front first outer gear 12 is attached to the casing MC of the electric motor M. The front planetary gear 14 revolves around the axis of the front sun gear 11 while rotating, and the front second outer gear 13 that meshes with the front planetary gear 14 rotates about the axis of the drive shaft m. When the rear stage sun gear 21 is rotated by the rotation of the rear stage second outer gear 23, the rear stage first outer gear 22 is attached to the casing MC of the electric motor M via the front stage housing 16, so that the rear stage planetary gear 24 rotates while the rear stage sun gear 21 rotates. And the second-stage second outer gear 23 meshing with the second-stage planetary gear 24 rotates around the axis of the drive shaft m. That is, when the electric motor M is driven, the rotation of the drive shaft m is decelerated at a high reduction ratio by the two strange gear mechanisms 10 and 20 and is output from the second outer gear 23 at the rear stage. Therefore, the position of the balance weight 30 can be changed with high accuracy by the rotation of the electric motor M, and it is possible to effectively suppress unbalance that occurs when the main shaft (not shown) rotates.

さらに、上述したバランスウエイト装置においては、それぞれのハウジング１６，２６を電動モータＭのケーシングＭＣに対して駆動軸ｍの軸心回りに回転させれば、ケーシングＭＣから取り外すことができ、内部に収容した不思議歯車機構１０，２０に対して容易にメインテナンスを施すことが可能となる。しかも、ハウジング１６，２６の着脱に際しては、上述したように、別途取付ネジを要することなくそれぞれの連結部分１２，１６，２２，２６にネジ溝１２１ａ，１６１ａ，２２２ａ，２６１ａを設けるようにしたため、各連結部分１２，１６，２２，２６にネジ孔を設けるためのスペースが不要となり、装置の大型化を招来する恐れがない。   Further, in the above-described balance weight device, if the respective housings 16 and 26 are rotated around the axis of the drive shaft m with respect to the casing MC of the electric motor M, they can be removed from the casing MC and accommodated inside. It is possible to easily perform maintenance on the mysterious gear mechanisms 10 and 20. In addition, when the housings 16 and 26 are attached and detached, as described above, the screw grooves 121a, 161a, 222a, and 261a are provided in the respective connecting portions 12, 16, 22, and 26 without requiring additional mounting screws. A space for providing a screw hole in each of the connecting portions 12, 16, 22, and 26 is not necessary, and there is no risk of increasing the size of the apparatus.

１０ 前段不思議歯車機構、１１ 前段サンギヤ、１２ 前段第１アウタギヤ、１３ 前段第２アウタギヤ、１４ 前段プラネタリギヤ、１５，２５ プラネタリキャリヤ、１６ 前段ハウジング、２０ 後段不思議歯車機構、２１ 後段サンギヤ、２２ 後段第１アウタギヤ、２３ 後段第２アウタギヤ、２４ 後段プラネタリギヤ、２６ 後段ハウジング、３０ バランスウエイト、３１ ウエイト部、３２ 支持片部、１２１ 前段第１ギヤ本体、１２１ａ 前段ハウジング用外周ネジ溝、１２１ｂ モータ用内周ネジ溝、１２２ 前段第１ギヤ保持体、１３１ 前段第２ギヤ本体、１３２ 前段出力軸、１３２ａ 前段フランジ部、１３２ｂ 支持軸部、１３２ｃ 軸本体、１３２ｄ 前段軸受部、１６１ 前段ハウジング基部、１６１ａ 前段ハウジング内周ネジ溝、１６２ 前段ギヤ支持部、１６２ａ 第２ギヤ用外周ネジ溝、２２１ 後段第１ギヤ本体、２２２ 後段第１ギヤ保持体、２２２ａ 後段ハウジング用外周ネジ溝、２２２ｂ 前段ハウジング用内周ネジ溝、２３１ 後段第２ギヤ本体、２３２ 後段出力軸、２３２ａ 後段フランジ部、２３２ｂ 支持軸本体、２３２ｃ 後段軸受部、２６１ 後段ハウジング基部、２６１ａ 後段ハウジング内周ネジ溝、２６２ 後段ギヤ支持部、Ｍ 電動モータ、ＭＣ ケーシング、ＭＣ１ 本体ケース、ＭＣ２ 取付プレート、ｍ 駆動軸、ｎ 保持用外周ネジ溝   DESCRIPTION OF SYMBOLS 10 Front stage mysterious gear mechanism, 11 Front stage sun gear, 12 Front stage 1st outer gear, 13 Front stage 2nd outer gear, 14 Front stage planetary gear, 15, 25 Planetary carrier, 16 Front stage housing, 20 Back stage mysterious gear mechanism, 21 Back stage sun gear, 22 Back stage 1st stage Outer gear, 23 Rear stage second outer gear, 24 Rear stage planetary gear, 26 Rear stage housing, 30 Balance weight, 31 Weight part, 32 Support piece part, 121 Front stage first gear main body, 121a Front stage outer peripheral screw groove, 121b Motor inner peripheral screw Groove, 122 Pre-stage first gear holder, 131 Pre-stage second gear main body, 132 Pre-stage output shaft, 132a Pre-stage flange, 132b Support shaft, 132c Shaft body, 132d Pre-stage bearing, 161 Pre-stage housing base, 161a Pre-stage housing Inner thread groove, 162 front gear support section, 162a second gear outer thread groove, 221 rear first gear body, 222 rear first gear holder, 222a rear housing outer thread groove, 222b front housing inner circumference Threaded groove, 231 Rear stage second gear body, 232 Rear stage output shaft, 232a Rear stage flange part, 232b Support shaft body, 232c Rear stage bearing part, 261 Rear stage housing base part, 261a Rear stage inner circumferential thread groove, 262 Rear stage gear support part, M Electric motor, MC casing, MC1 body case, MC2 mounting plate, m drive shaft, n outer peripheral thread groove for holding

Claims (2)

相互に接続された２組の遊星歯車機構を介して回転アクチュエータの駆動軸から与えられる回転を外部に出力することにより、駆動軸の軸心に対するバランスウエイトの位置を変更するようにしたバランスウエイト装置において、
２組の遊星歯車機構は、それぞれが互いに歯数の異なる２つのアウタギヤを備えた不思議歯車機構として構成したものであり、
前段となる不思議歯車機構において固定側となる前段固定アウタギヤの周面と、前記前段となる不思議歯車機構の外周部を覆う前段ハウジングの周面との間にネジ溝を設け、前記ネジ溝により前記前段固定アウタギヤと前記前段ハウジングとの間を互いに螺合し、
後段となる不思議歯車機構において固定側となる後段固定アウタギヤの周面と、前記前段ハウジングの周面との間にネジ溝を設け、前記ネジ溝により前記後段固定アウタギヤと前記前段ハウジングとの間を互いに螺合し、
前記後段となる不思議歯車機構の外周部を覆う後段ハウジングの周面と、前記後段固定アウタギヤの周面との間にネジ溝を設け、前記ネジ溝により前記後段ハウジングと前記後段固定アウタギヤとの間を互いに螺合したことを特徴とするバランスウエイト装置。 A balance weight device for changing the position of the balance weight with respect to the axis of the drive shaft by outputting the rotation given from the drive shaft of the rotary actuator to the outside through two planetary gear mechanisms connected to each other In
The two sets of planetary gear mechanisms are configured as a wonder gear mechanism having two outer gears each having a different number of teeth.
A screw groove is provided between the peripheral surface of the front fixed outer gear on the fixed side in the mysterious gear mechanism serving as the front stage and the peripheral surface of the front housing covering the outer periphery of the mysterious gear mechanism serving as the front stage, The front fixed outer gear and the front housing are screwed together,
A screw groove is provided between the circumferential surface of the rear fixed outer gear on the stationary side and the peripheral surface of the front housing in the mysterious gear mechanism at the rear stage, and the screw groove provides a gap between the rear fixed outer gear and the front housing. Screwed together,
A screw groove is provided between the peripheral surface of the rear housing that covers the outer periphery of the mysterious gear mechanism as the rear stage and the peripheral surface of the rear fixed outer gear, and the screw groove allows the gap between the rear housing and the rear fixed outer gear. The balance weight device characterized by being screwed together. それぞれの不思議歯車機構においては、固定アウタギヤの外周面と当該不思議歯車機構の外周部を覆うハウジングの内周面との間にネジ溝を形成し、かつ前段の不思議歯車機構と後段の不思議歯車機構との間においては、前記後段固定アウタギヤの内周面と前記前段ハウジングの外周面との間にネジ溝を形成したことを特徴とする請求項１に記載のバランスウエイト装置。   In each of the mysterious gear mechanisms, a screw groove is formed between the outer peripheral surface of the fixed outer gear and the inner peripheral surface of the housing covering the outer peripheral portion of the mysterious gear mechanism, and the mysterious gear mechanism at the front stage and the mysterious gear mechanism at the rear stage. 2. The balance weight device according to claim 1, wherein a thread groove is formed between an inner peripheral surface of the rear fixed outer gear and an outer peripheral surface of the front housing.
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Publication number Priority date Publication date Assignee Title
CN111164270A (en) * 2017-10-06 2020-05-15 日本电产伺服有限公司 Motor unit and drive device
CN111164270B (en) * 2017-10-06 2022-01-18 日本电产伺服有限公司 Motor unit and drive device

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