JP2015064064A - Planetary reduction gear, and method for fixing internal gear in planetary reduction gear - Google Patents

Planetary reduction gear, and method for fixing internal gear in planetary reduction gear Download PDF

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JP2015064064A
JP2015064064A JP2013198707A JP2013198707A JP2015064064A JP 2015064064 A JP2015064064 A JP 2015064064A JP 2013198707 A JP2013198707 A JP 2013198707A JP 2013198707 A JP2013198707 A JP 2013198707A JP 2015064064 A JP2015064064 A JP 2015064064A
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gear
planetary
internal gear
case
front case
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鈴木　潤
Jun Suzuki
潤 鈴木
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Nissei Corp
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Abstract

PROBLEM TO BE SOLVED: To allow an internal gear to be fixed to the inside of a case without enlarging an outside diameter of the internal gear, to achieve downsizing.SOLUTION: A planetary reduction gear 1 is provided in which a planetary gear 21 which revolves in an internal gear 27 by using a sun gear 13 on an input side as a center, and a carrier 16 which supports the planetary gear 21, and accommodates the sun gear 13 in an axial core are provided in a case 2 including a front case 6 and a rear case 7. The internal gear 27 is fixed to the front case 6 by shrink-fitting. That is, both the front case 6 and the internal gear 27 are manufactured so that an inside diameter of a receiving seat 28 of the front case 6 and an outside diameter of the internal gear are substantially equal to each other, the internal gear 27 is fit to the receiving seat 28 in a state that the front case 6 is heated and inflated in advance, and the internal gear 27 is brought into a firmly-fixed state by the cooled and contracted front case 6.

Description

本発明は、入力軸の回転を遊星歯車減速機構を介して出力軸へ減速して伝達する遊星減速機と、その遊星減速機で用いられるインターナルギヤを固定する方法とに関する。   The present invention relates to a planetary speed reducer that transmits rotation of an input shaft to an output shaft through a planetary gear speed reduction mechanism and a method for fixing an internal gear used in the planetary speed reducer.

遊星減速機は、ケース内に、駆動源から回転伝達される入力軸と、入力軸と同軸の出力軸との間に、インターナルギヤ内で公転運動する遊星歯車を設けて遊星歯車を保持するキャリアを出力側に、遊星歯車の中心に位置する太陽歯車を入力側に設けてなる遊星歯車減速機構を介在させている。
このような遊星減速機においては、インターナルギヤは、特許文献１に示すように、ケースとの間に跨がって設けられるピンを用いたり、ボルトを用いたりしてケースに対して固定される。 The planetary speed reducer holds a planetary gear by providing a planetary gear that revolves in an internal gear between an input shaft that is rotationally transmitted from a drive source and an output shaft that is coaxial with the input shaft. A planetary gear speed reduction mechanism is provided in which a carrier is provided on the output side and a sun gear located at the center of the planetary gear is provided on the input side.
In such a planetary speed reducer, as shown in Patent Document 1, the internal gear is fixed to the case using a pin provided between the case and a bolt or using a bolt. The

特開２００７−３１５５４３号公報JP 2007-315543 A

しかし、ピンやボルトを用いた従来の固定構造では、ピンやボルト用の孔を加工するためにインターナルギヤにおいて径方向の肉厚を確保する必要がある。このためインターナルギヤの外径が大きくなって遊星減速機のコンパクト化を阻害する原因となっていた。   However, in the conventional fixing structure using pins and bolts, it is necessary to secure a radial thickness in the internal gear in order to process holes for the pins and bolts. For this reason, the outer diameter of the internal gear becomes large, which has been a cause of hindering the downsizing of the planetary reduction gear.

そこで、本発明は、インターナルギヤの外径を大きくすることなくケース内に固定可能としてコンパクト化が実現できる遊星減速機と、遊星減速機におけるインターナルギヤの固定方法とを提供することを目的としたものである。   SUMMARY OF THE INVENTION An object of the present invention is to provide a planetary speed reducer that can be compacted so that it can be fixed in a case without increasing the outer diameter of the internal gear, and an internal gear fixing method in the planetary speed reducer. It is what.

上記目的を達成するために、請求項１に記載の発明は、ケース内に、入力側の太陽歯車を中心としてインターナルギヤ内で公転運動する遊星歯車と、その遊星歯車を支持して軸心に太陽歯車を収容するキャリアとを設けた遊星減速機であって、インターナルギヤをケースに焼きばめによって固定したことを特徴とするものである。
上記目的を達成するために、請求項２に記載の発明は、遊星減速機のケース内に、遊星歯車を公転運動させるインターナルギヤを固定する方法であって、インターナルギヤをケースに焼きばめによって固定することを特徴とするものである。 In order to achieve the above object, the invention according to claim 1 is characterized in that a planetary gear that revolves in an internal gear around a sun gear on an input side in a case, and an axial center that supports the planetary gear and supports the planetary gear. The planetary reduction gear provided with a carrier for housing the sun gear is characterized in that the internal gear is fixed to the case by shrink fitting.
In order to achieve the above object, an invention according to claim 2 is a method of fixing an internal gear for revolving a planetary gear in a case of a planetary speed reducer, wherein the internal gear is burned into the case. It is characterized by being fixed by means of a screw.

本発明によれば、ボルトやピンによる締結部分がなくなってインターナルギヤの外径を小さくでき、ひいてはケースを径方向にコンパクト化できる。また、ボルトやピンによる締結部分の加工が不要となってボルト等も不要となるため、製造コストの低減に繋がる。   According to the present invention, there is no fastening portion by a bolt or a pin, the outer diameter of the internal gear can be reduced, and the case can be made compact in the radial direction. Moreover, since the process of the fastening part by a volt | bolt or a pin becomes unnecessary and a volt | bolt etc. become unnecessary, it leads to the reduction of manufacturing cost.

遊星減速機の縦断面図である。It is a longitudinal cross-sectional view of a planetary reduction gear. 前ケースにインターナルギヤを嵌合させる状態を示す説明図である。It is explanatory drawing which shows the state which makes an internal gear fit in a front case. インターナルギヤの正面図である。It is a front view of an internal gear. 後側支持部の説明図で、（Ａ）は正面、（Ｂ）は中央縦断面をそれぞれ示す。It is explanatory drawing of a rear side support part, (A) shows a front, (B) shows a center longitudinal cross-section, respectively. 前ケースの供給孔部分を示す説明図である。It is explanatory drawing which shows the supply hole part of a front case. 後側支持部において潤滑剤が遊星軸に達する状態を示す説明図である。It is explanatory drawing which shows the state in which a lubricant reaches a planetary shaft in a rear side support part.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、遊星減速機の一例を示す縦断面図で、遊星減速機１は、ケース２内の後方（図１の左側を前方とする。）に入力軸３を収容し、その入力軸３の前方に同軸で配置した出力軸４を前方へ突出させて、入力軸３と出力軸４との間に遊星歯車減速機構５を設けている。
まずケース２は、出力軸４を軸支して遊星歯車減速機構５を収容する前ケース６と、入力軸３を軸支する後ケース７とに分割されており、両ケース６，７はボルト８によって連結されている。後ケース７は、軸受９を介して入力軸３を同軸で回転可能に軸支する筒状体で、後ケース７の後部には、モータを組み付け可能なブラケット１０がボルト１１で連結されている。入力軸３は、軸心にモータ軸の連結孔１２が形成される筒状体で、前ケース６内に突出する前端には、同軸で太陽歯車１３が固定されている。１４は、後ケース７の前端に組み付けられて入力軸３との間をシールするシール部材である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an example of a planetary speed reducer. The planetary speed reducer 1 accommodates an input shaft 3 behind the case 2 (the left side in FIG. 1 is the front). The planetary gear reduction mechanism 5 is provided between the input shaft 3 and the output shaft 4 by projecting the output shaft 4 coaxially arranged in front of the front shaft.
First, the case 2 is divided into a front case 6 that supports the output shaft 4 and accommodates the planetary gear speed reduction mechanism 5, and a rear case 7 that supports the input shaft 3, and both cases 6 and 7 are bolts. 8 are connected. The rear case 7 is a cylindrical body that rotatably supports the input shaft 3 coaxially via a bearing 9, and a bracket 10 to which a motor can be assembled is connected to the rear portion of the rear case 7 with a bolt 11. . The input shaft 3 is a cylindrical body having a motor shaft connecting hole 12 formed in the shaft center, and a sun gear 13 is coaxially fixed to a front end protruding into the front case 6. Reference numeral 14 denotes a seal member that is assembled to the front end of the rear case 7 and seals between the input shaft 3.

一方、前ケース６も、軸受１５を介して出力軸４を同軸で回転可能に軸支する筒状体で、出力軸４の後端には、出力軸４より大径のキャリア１６が連設されている。このキャリア１６は、出力軸４と連設される前側支持部１６Ａと、その後方で軸受１７によって軸支される後側支持部１６Ｂとに二分割されており、両支持部１６Ａ，１６Ｂの互いの対向面にそれぞれ形成された有底孔１８，１８間に跨がって圧入される同心円上の３本のピン１９，１９・・により、両支持部１６Ａ，１６Ｂは一体に結合されている。この結合状態で両支持部１６Ａ，１６Ｂの間には、３つの遊星歯車２１，２１・・の収容空間２０が形成されている。   On the other hand, the front case 6 is also a cylindrical body that rotatably supports the output shaft 4 coaxially through a bearing 15, and a carrier 16 having a diameter larger than that of the output shaft 4 is provided at the rear end of the output shaft 4. Has been. The carrier 16 is divided into a front support portion 16A that is connected to the output shaft 4 and a rear support portion 16B that is supported by a bearing 17 behind the output shaft 4, and the support portions 16A and 16B are connected to each other. The two support portions 16A and 16B are integrally coupled by three concentric pins 19 which are press-fitted across the bottomed holes 18 and 18 formed on the opposing surfaces of . In this coupled state, an accommodation space 20 for three planetary gears 21, 21,... Is formed between the support portions 16A, 16B.

遊星歯車減速機構５の各遊星歯車２１は、軸心を貫通する遊星軸２２との間に遊星軸受（ここではニードルベアリング）２３を介在させたもので、遊星軸２２の前後端は、両支持部１６Ａ，１６Ｂにそれぞれ貫通形成された結合孔２４に圧入されている。また、後側支持部１６Ｂの中心には、収容空間２０と連通する貫通孔２５が形成されて、入力軸３の太陽歯車１３は、貫通孔２５を貫通して収容空間２０内に突出し、前端を前側支持部１６Ａの後面中央に設けた凹み部２６内に位置させて各遊星歯車２１と噛合している。この貫通孔２５及び収容空間２０の中心部、凹み部２６が太陽歯車１３の収容部となる。   Each planetary gear 21 of the planetary gear speed reduction mechanism 5 has a planetary bearing (here, a needle bearing) 23 interposed between the planetary shaft 22 penetrating the shaft center, and the front and rear ends of the planetary shaft 22 are both supported. The parts 16A and 16B are press-fitted into coupling holes 24 that are formed through the parts 16A and 16B. In addition, a through hole 25 communicating with the accommodation space 20 is formed at the center of the rear support portion 16B, and the sun gear 13 of the input shaft 3 penetrates the through hole 25 and projects into the accommodation space 20, and the front end Is located in a recessed portion 26 provided at the center of the rear surface of the front support portion 16A and meshes with each planetary gear 21. The through hole 25, the central portion of the accommodation space 20, and the recess 26 serve as an accommodation portion for the sun gear 13.

２７は、遊星歯車２１の外周にあって遊星歯車２１が噛合するインターナルギヤで、軸受１５，１７の間で前ケース６に形成した受け座２８に固定されるが、ここではいわゆる焼きばめによって固定されている。すなわち、受け座２８の内径とインターナルギヤ２７の外径とを略等しくして両者を作製し、前ケース６を予め加熱して膨張させた状態で、図２に示すようにインターナルギヤ２７を受け座２８に嵌合させ、冷却して収縮した前ケース６によってインターナルギヤ２７を固着状態としたものである。従って、インターナルギヤ２７は、図３に示すように外周にボルト等の締結部分がなく、径方向の肉厚が薄くなっている。   Reference numeral 27 denotes an internal gear which is located on the outer periphery of the planetary gear 21 and meshes with the planetary gear 21, and is fixed to a receiving seat 28 formed on the front case 6 between the bearings 15 and 17. It is fixed by. That is, both the inner diameter of the receiving seat 28 and the outer diameter of the internal gear 27 are made substantially equal to each other, and the internal gear 27 is heated as shown in FIG. The internal gear 27 is brought into a fixed state by the front case 6 fitted into the receiving seat 28 and cooled and contracted. Therefore, as shown in FIG. 3, the internal gear 27 has no fastening portion such as a bolt on the outer periphery, and is thin in the radial direction.

そして、後側支持部１６Ｂの前面には、貫通孔２５と同心円上となる凹部２９が形成されている。この凹部２９は、図４に示すように、外周縁が遊星軸２２の結合孔２４に達する正面視円形状で、中心側は貫通孔２５と連通するまで凹設されるもので、凹部２９の外周縁２９ａは、前方へ行くに従って拡径するテーパ状となっている。
３０は、前ケース６の前端で出力軸４との間に設けられたシール部材で、前ケース６には、図５に示すように、プラグで閉塞される潤滑剤の供給孔３１が形成されており、ここから前ケース６内に潤滑剤が供給可能となっている。 A recess 29 that is concentric with the through hole 25 is formed on the front surface of the rear support portion 16B. As shown in FIG. 4, the recess 29 has a circular shape when viewed from the front where the outer peripheral edge reaches the coupling hole 24 of the planetary shaft 22, and the center side is recessed until it communicates with the through hole 25. The outer peripheral edge 29a has a tapered shape that increases in diameter toward the front.
Reference numeral 30 denotes a seal member provided between the front end of the front case 6 and the output shaft 4. The front case 6 is provided with a lubricant supply hole 31 closed by a plug as shown in FIG. From here, the lubricant can be supplied into the front case 6.

以上の如く構成された遊星減速機１においては、入力軸３に連結されたモータ軸の回転によって入力軸３が回転すると、先端の太陽歯車１３と噛合する遊星歯車２１がインターナルギヤ２７内で自転しながら公転運動する。この公転運動によってキャリア１６が減速して回転し、出力軸４を同時に回転させる。このとき、前ケース６内に供給された潤滑剤は、キャリア１６の収容空間２０にも進入し、太陽歯車１３と遊星歯車２１とが噛み合う部分で押し出されるように内部を循環するが、ここでは潤滑剤が押し出される部分と後側支持部１６Ｂの凹部２９の内周とがすぐ近い位置にあるので、潤滑剤は凹部２９に流入する。すると、図６に示すように、凹部２９内に貯留する潤滑剤（網掛け部分）が矢印で示すように放射方向へ移動して遊星軸２２及び遊星軸受２３まで容易に到達する。よって、遊星歯車２１の端面と両支持部１６Ａ，１６Ｂの端面との隙間が狭くても、凹部２９を介して遊星軸受２３には十分な量の潤滑剤が供給可能となる。   In the planetary reduction gear 1 configured as described above, when the input shaft 3 is rotated by the rotation of the motor shaft connected to the input shaft 3, the planetary gear 21 that meshes with the sun gear 13 at the tip is within the internal gear 27. Revolves while rotating. The carrier 16 decelerates and rotates by this revolving motion, and the output shaft 4 rotates simultaneously. At this time, the lubricant supplied into the front case 6 also enters the housing space 20 of the carrier 16 and circulates in the interior so that it is pushed out at the portion where the sun gear 13 and the planetary gear 21 mesh with each other. Since the portion where the lubricant is pushed out and the inner periphery of the concave portion 29 of the rear side support portion 16B are in a close position, the lubricant flows into the concave portion 29. Then, as shown in FIG. 6, the lubricant (shaded portion) stored in the recess 29 moves in the radial direction as indicated by the arrow and easily reaches the planetary shaft 22 and the planetary bearing 23. Therefore, even if the gap between the end face of the planetary gear 21 and the end faces of the support portions 16A and 16B is narrow, a sufficient amount of lubricant can be supplied to the planetary bearing 23 through the recess 29.

このように、上記形態の遊星減速機１によれば、インターナルギヤ２７を前ケース６に焼きばめによって固定しているので、ボルトやピンによる締結部分がなくなってインターナルギヤ２７の外径を小さくでき、ひいてはケース２を径方向にコンパクト化できる。また、ボルトやピンによる締結部分の加工が不要となってボルト等も不要となるため、製造コストの低減に繋がる。   As described above, according to the planetary reduction gear 1 of the above embodiment, since the internal gear 27 is fixed to the front case 6 by shrink fitting, there is no fastening portion by bolts or pins and the outer diameter of the internal gear 27 is reduced. The case 2 can be made compact in the radial direction. Moreover, since the process of the fastening part by a volt | bolt or a pin becomes unnecessary and a volt | bolt etc. become unnecessary, it leads to the reduction of manufacturing cost.

なお、上記形態ではキャリアを前側支持部と後側支持部とに分割して両支持部を結合するようにしているが、両支持部を部分的に結合して一体化したキャリアであっても差し支えない。
そして、上記形態では、遊星歯車とキャリアとを一段備えた遊星歯車減速機構となっているが、遊星歯車とキャリアとを軸方向に二段以上備えた遊星歯車減速機構であっても本発明は適用できる。 In the above embodiment, the carrier is divided into the front support portion and the rear support portion so that both the support portions are combined. However, even if the support portion is partially combined and integrated, There is no problem.
In the above embodiment, the planetary gear reduction mechanism has one planetary gear and a carrier. However, the present invention is applicable to a planetary gear reduction mechanism having two or more planetary gears and a carrier in the axial direction. Applicable.

１・・遊星減速機、２・・ケース、３・・入力軸、４・・出力軸、５・・遊星歯車減速機構、６・・前ケース、７・・後ケース、１３・・太陽歯車、１６・・キャリア、１６Ａ・・前側支持部、１６Ｂ・・後側支持部、２０・・収容空間、２１・・遊星歯車、２２・・遊星軸、２３・・遊星軸受、２４・・結合孔、２５・・貫通孔、２６・・凹部、２７・・インターナルギヤ、２８・・受け座、２９・・凹部。   1 .... planetary speed reducer, 2 .... case, 3 .... input shaft, 4 .... output shaft, 5 .... planetary gear reduction mechanism, 6 .... front case, 7 .... rear case, 13 .... sun gear, 16 ··· Carrier, 16A ·· Front support portion, 16B ·· Rear support portion, 20 ·· Storage space, 21 ·· Planetary gear, 22 ·· Planetary shaft, 23 ·· Planetary bearing, 24 ·· Coupling hole, 25..Through hole 26..Recessed portion 27..Internal gear 28..Reception seat 29..Recessed portion

Claims (2)

ケース内に、入力側の太陽歯車を中心としてインターナルギヤ内で公転運動する遊星歯車と、その遊星歯車を支持して軸心に前記太陽歯車を収容するキャリアとを設けた遊星減速機であって、
前記インターナルギヤを前記ケースに焼きばめによって固定したことを特徴とする遊星減速機。 A planetary speed reducer provided with a planetary gear that revolves in an internal gear centering on an input-side sun gear and a carrier that supports the planetary gear and accommodates the sun gear in an axial center in a case. And
A planetary speed reducer characterized in that the internal gear is fixed to the case by shrink fitting. 遊星減速機のケース内に、遊星歯車を公転運動させるインターナルギヤを固定する方法であって、
前記インターナルギヤを前記ケースに焼きばめによって固定することを特徴とする遊星減速機におけるインターナルギヤの固定方法。 A method of fixing an internal gear for revolving the planetary gear in the case of the planetary reducer,
A method of fixing an internal gear in a planetary reducer, wherein the internal gear is fixed to the case by shrink fitting.
JP2013198707A 2013-09-25 2013-09-25 Planetary reduction gear, and method for fixing internal gear in planetary reduction gear Pending JP2015064064A (en)

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CN107269772A (en) * 2017-07-10 2017-10-20 淄博纽氏达特行星减速机有限公司 The high-precision planetary reducer of small speed reducing ratio
JP2017227330A (en) * 2016-06-22 2017-12-28 日本電産新宝（浙江）有限公司 Speed reducer and actuator
KR20210117428A (en) * 2020-03-19 2021-09-29 주식회사 본시스템즈 Thin profile cycloid reducer

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CN106969100A (en) * 2015-10-19 2017-07-21 日本电产新宝株式会社 Variable-speed motor
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JP2017227330A (en) * 2016-06-22 2017-12-28 日本電産新宝（浙江）有限公司 Speed reducer and actuator
CN107524761A (en) * 2016-06-22 2017-12-29 日本电产新宝(浙江)有限公司 Reductor and actuator
JP7188849B2 (en) 2016-06-22 2022-12-13 日本電産新宝（浙江）有限公司 Reducer and Actuator
CN107524761B (en) * 2016-06-22 2023-07-14 日本电产新宝(浙江)有限公司 Speed reducer and actuator
CN107269772A (en) * 2017-07-10 2017-10-20 淄博纽氏达特行星减速机有限公司 The high-precision planetary reducer of small speed reducing ratio
KR20210117428A (en) * 2020-03-19 2021-09-29 주식회사 본시스템즈 Thin profile cycloid reducer
KR102433732B1 (en) * 2020-03-19 2022-08-19 주식회사 본시스템즈 Thin profile cycloid reducer

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