WO2015025493A1 - 減速機構 - Google Patents

減速機構 Download PDF

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Publication number
WO2015025493A1
WO2015025493A1 PCT/JP2014/004102 JP2014004102W WO2015025493A1 WO 2015025493 A1 WO2015025493 A1 WO 2015025493A1 JP 2014004102 W JP2014004102 W JP 2014004102W WO 2015025493 A1 WO2015025493 A1 WO 2015025493A1
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Prior art keywords
gear
planetary
gears
stage
small
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PCT/JP2014/004102
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English (en)
French (fr)
Inventor
金井 孝
田中 祐介
松下 裕樹
嵩幸 遠藤
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日本電産コパル電子株式会社
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Application filed by 日本電産コパル電子株式会社 filed Critical 日本電産コパル電子株式会社
Priority to JP2015532699A priority Critical patent/JP6278968B2/ja
Publication of WO2015025493A1 publication Critical patent/WO2015025493A1/ja
Priority to US15/042,597 priority patent/US9689466B2/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H1/00Toothed gearings for conveying rotary motion
    • F16H1/28Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/36Toothed gearings for conveying rotary motion with gears having orbital motion with two central gears coupled by intermeshing orbital gears
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H1/00Toothed gearings for conveying rotary motion
    • F16H1/28Toothed gearings for conveying rotary motion with gears having orbital motion
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears

Definitions

  • the present invention relates to a speed reduction mechanism such as a gear motor having a high torque output used for a muscle force assist device or the like.
  • a gear motor having a high torque output employs a multi-stage planetary gear system in which planetary gear mechanisms are stacked in one and two stages to obtain a reduction ratio.
  • a high torque output can be obtained, but there is a drawback that it is thin and cannot be reduced in size and weight. For this reason, a compound planetary gear mechanism formed by coupling elements of two planetary gear mechanisms has been considered.
  • the present invention provides a high torque output, is thin, can be reduced in size and weight, and is capable of freely setting the number of gear teeth and the reduction ratio.
  • the purpose is to provide a mechanism.
  • the present invention is a reduction mechanism in which a planetary two-stage gear is arranged between a sun gear and an internal gear of a planetary gear mechanism, and the planetary two-stage gear between the sun gear and the internal gear.
  • a reduction gear mechanism is configured by arranging at least one planetary two-stage gear provided with a small gear or a large gear meshing with the large gear or the small gear.
  • the present invention has the following effects.
  • (1) According to claim 1, at least one planetary two-stage gear provided with a small gear or a large gear meshing with the large gear or the small gear of the planetary two-stage gear is arranged between the sun gear and the internal gear.
  • the shaft can be reliably prevented from shaking when an unbalanced load is generated, and a large speed reduction can be achieved, a high torque output can be obtained, the speed reduction part can be made thin, and the size and weight can be reduced. it can.
  • (2) According to the second aspect, the same effect as the above (1) can be obtained, and the gear ratio between the large gear and the small gear of the planetary two-stage gear is set to a non-integer multiple.
  • FIG. 3 is a sectional view taken along line 1-1 of FIG.
  • Explanatory drawing of the 1st planetary two-stage gear of the 1st form for carrying out the present invention.
  • Explanatory drawing of the 2nd two-stage gearwheel of the 1st form for implementing this invention.
  • FIG. 10 is a sectional view taken along line 10-10 in FIG. 9;
  • FIG. 10 is a cross-sectional view taken along line 11-11 in FIG. 9;
  • FIG. 12 is a sectional view taken along line 12-12 of FIG.
  • reference numeral 1 denotes a gear motor of the present invention which is thin, small and light, and this gear motor 1 includes an outer rotor type motor 2, A motor base 6 in which an encoder storage chamber 5 that enters a free space 4 existing in the center of the rotor 3 of the outer rotor type motor 2 is formed, and this motor base 6 constitutes a part of a planet carrier serving as an output shaft.
  • a planetary gear storage case 10 including a shallow dish-shaped bearing storage case 9 fixed by a plurality of screws 8 via a carrier mount 14 and an inner portion of the planetary gear storage case 10 used for the outer rotor type motor 2.
  • a ring-shaped magnet 40 as a rotational position information recording body magnetized on the side surface so as to give position information to an absolute sensor attached to 39, and the ring-shaped magnet in the encoder storage chamber 5 of the planetary gear storage case 10;
  • a magnetic absolute sensor 25 capable of detecting the
  • a ball bearing 28 interposed between the outer peripheral portion of the base portion of the shaft 24 and the bearing storage case 9 of the planetary gear storage case 10, the inner wall surface of the carrier mount 14, and the upper end portion of the shaft 11 And a ball bearing 29 interposed therebetween.
  • the speed reduction mechanism 41 uses a helical gear fixed to a portion of the shaft 11 located in the planetary gear storage case 10, for example, the sun gear 12 having nine teeth, and the planetary gear storage case 10.
  • a sensor base 13 provided so as to rotate integrally therewith, a carrier mount 14 serving as an output shaft, and a shaft 11 of the outer rotor type motor 2 located in the planetary gear housing case 10 are fixed.
  • a plurality of helical gears are provided with both ends supported by the sensor base 13 and the carrier mount 14 via ball bearings 15 and 15 so as to mesh with the sun gear 12.
  • the large gears 16, 16, 16 having, for example, 21 teeth, and the same shaft center as that of the large gears 16, 16, 16 are used.
  • the first planetary two-stage gears 18, 18, 18 composed of small gears 17, 17, 17 having, for example, nine teeth, and the first planetary two-stage gears 18, 18, 18 and the horizontal direction Both ends of the first planetary two-stage gears 18, 18, 18 that are arranged in the first planetary gears 17, 17, 17 mesh with the sensor base 13 and the carrier mount 14 that serves as an output shaft.
  • a second planetary two-stage gear 44, 44, 44 composed of seven small gears 43, 43, 43, and a second gear 43, 43, 43 of the second planetary two-stage gear 44, 44, 44; 43 and the planetary gear storage case.
  • 10 is rotatably attached to the planetary gear shafts 21, 21, 21 attached to the sensor base 13 and the carrier mount 14 which mesh with the internal gear 19 fixed to the inner wall surface 10a of the motor 10 via ball bearings 22, 22, 22.
  • it is composed of planetary gears 23, 23, 23 having 20 teeth.
  • the first planetary two-stage gears 18, 18, 18 use gears with large gears 16, 16, 16 and small gears 17, 17, 17 having an integer multiple of teeth or gears having a non-integer multiple. can do.
  • the large gears 16, 16, 16 of the first planetary gears 18, 18, 18 respectively When the number of teeth of the small gears 17, 17, 17 is an integral multiple,
  • the first planetary two-stage gear 18 has a large gear 16 of 14 and a small gear 17 of 7
  • the overall gear ratio (reduction ratio) is 34.3.
  • the first planetary two-stage gear 18 has a large gear 16 of 14 and a small gear 17 of 7
  • the overall gear ratio (reduction ratio) is 51.0. In this way, even if the number of gear teeth is changed in the smallest unit, the overall gear ratio (reduction ratio) changes greatly.
  • the first planetary two-stage gear 18 has a large gear 16 of 35 and a small gear 17 of 32.
  • the overall gear ratio (reduction ratio) is 10.4.
  • the first planetary two-stage gear 18 has a large gear 16 of 35 and a small gear 17 of 32.
  • the overall gear ratio (reduction ratio) is 10.7.
  • the first planetary two-stage gear is also obtained.
  • the gear ratio of each of the 18 and the second planetary two-stage gear 44 it becomes possible to finely adjust the overall gear ratio (reduction ratio) by 0.1. Even if there is a limit, it is possible to design freely, and the overall gear ratio (reduction ratio) can be finely adjusted, so normally, the motor itself must be changed to obtain the optimum torque. Even in situations where this is not possible, it can be handled without changing the motor, so that the degree of freedom in design and a significant cost reduction can be achieved.
  • the second planetary two-stage gears 44, 44, 44 also have large gears 42, 42, 42 and small gears 43, 43, 43 that are integral multiples like the first planetary two-stage gears 18, 18, 18.
  • a gear having a number of teeth and a gear having a number of teeth that is not an integral multiple can be used.
  • the rotor 3 is composed of an outer cylinder 31 having a shaft 11 fixed at the center and covering a main magnet 30 disposed on the outer periphery, and 32 is an iron core.
  • the rotation of the shaft 11 of the outer rotor type motor 2 is caused by the meshing of the sun gear 12 with the large gears 16, 16, 16 of the first planetary two-stage gears 18, 18, 18, and the first planetary two-stage gear.
  • 18, 18, 18 small gears 17, 17, 17 and second planetary two-stage gears 44, 44, 44 mesh with large gears 42, 42, 42, second planetary two-stage gears 44, 44, 44.
  • the gears 43, 43, 43 and the planetary gears 23, 23, 23 and the planetary gears 23, 23, 23 and the internal gears 19, 19, 19 can be decelerated.
  • the first planetary two-stage gears 18, 18, 18 and the second planetary two-stage gears 44, 44, 44 can be used in a thin, small-sized, Can reduce weight .
  • an absolute sensor 25 is disposed in an encoder storage chamber 5 that enters a free space 4 existing in the center of the rotor 3 of the outer rotor type motor 2 of the planetary gear storage case 10, and The rotation angle of the output shaft after deceleration can be detected by a ring-shaped magnet 40 attached to the sensor base 13 at a portion corresponding to the absolute sensor 25 via a magnet attachment ring 39.
  • the absolute sensor 25 As the absolute sensor 25, other types of sensors such as an optical type, a capacitance type, and a contact type can be used in addition to the magnetic type shown here.
  • the rotational position information recording body that gives position information to the absolute sensor 25 is also changed appropriately to a slit disk or the like according to the method.
  • the sun gear 12 and the large gears 16, 16, and 16 of the first planetary two-stage gears 18, 18, and 18 are helical gears.
  • a slightly spur gear may be used.
  • any of a spur gear, a helical gear, and a helical gear may be used.
  • the value of the module may be reduced for a gear with a small load.
  • the first planetary two-stage gears 18, 18, The 18 large gears 16, 16, 16 and the small gears 17, 17, 17 are set to different values, and the values of the large gears 16, 16, 16 are engaged with the large gears 16, 16, 16.
  • the value of the module of the sun gear 12 is matched, and the value of the module of the small gears 17, 17, 17 and the large gear 42, 42, 42 of the second planetary two-stage gear 44 that meshes with the small gear 17, 17, 17.
  • the gear motor 1 configured as described above uses the carrier mount 14 as an output shaft by fixing the internal gear 19, but by fixing the carrier mount 14 and the sensor base 13 as a planetary carrier,
  • the gear 19 can also be configured as an output shaft.
  • the absolute sensor 25 needs to be disposed in the encoder housing chamber 5 so as to rotate together with the internal gear.
  • FIG. 13 schematically shows a combination of gears according to the first embodiment for carrying out the present invention shown in FIGS.
  • FIG. 14 schematically shows the combination of the gears of the second form as in FIG.
  • the second embodiment for carrying out the present invention shown in FIG. 14 is mainly different from the first embodiment for carrying out the present invention in that the second planetary two-stage gears 44, 44, 44 are small gears.
  • the third planetary two-stage gears 44, 44, 44 including the large gears 45, 45, 45 meshing with the 43, 43, 43 are connected to the small gears 43, 43, 43 and the large gears 45, 45, 45.
  • the planetary gears 23, 23, 23 can be omitted.
  • the small gears 43, 43, 43 of the second planetary two-stage gears 44, 44, 44 mesh with the internal gear 19
  • the third planetary two-stage gear 47 is engaged. 47, 47 and the internal gear 19 mesh with the small gears 46, 46, 46.
  • the present invention is used in a gear motor reduction mechanism having a high torque output used for a muscle force assist device and the like and in an industry for manufacturing a gear motor using the reduction mechanism.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Retarders (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

本発明は、遊星歯車機構の太陽歯車と内歯車との間に遊星2段歯車が配列された減速機構において、太陽歯車と内歯車との間に前記遊星2段歯車の大歯車あるいは小歯車と互いに噛み合う小歯車あるいは大歯車を備える少なくとも1個の遊星2段歯車を配列して減速機構を構成しており、高トルク出力が得られ、薄型で小型化や軽量化を図ることができるとともに、歯車の歯数や減速比を自由に設定することができる減速機構を得ることができる。

Description

減速機構
 本発明は筋力アシスト装置等に使用される高トルク出力を有するギヤモータ等の減速機構に関する。
 従来、高トルク出力を有するギヤモータは遊星歯車機構を1段、2段と積み重ねて、減速比を獲得する多段式遊星歯車方式がとられている。
しかしながら、このような方式だと高トルク出力が得られるが、薄型で小型化・軽量化することができないという欠点があった。
このため、2個の遊星歯車機構の各要素を結合してなる複合遊星歯車機構が考えられている。
 しかしながら、遊星歯車機構の設計には種々の条件(幾何学的条件、隣接条件、組立条件等)が課せられるため、その設計自由度が著しく制限される。
特に全ての遊星歯車が太陽歯車および内歯車と正しく噛み合うための組立条件はきわめて厳しい制約であり、選択可能な歯数の組合せ、および減速比が大幅に限定されてしまうという欠点があった。
実開昭64-35237号公報 特許第3248690号公報
 本発明は以上のような従来の欠点に鑑み、高トルク出力が得られ、薄型で小型化や軽量化を図ることができるとともに、歯車の歯数や減速比を自由に設定することができる減速機構を提供することを目的としている。
 本発明の前記ならびにそのほかの目的と新規な特徴は次の説明を添付図面と照らし合わせて読むと、より完全に明らかになるであろう。
ただし、図面はもっぱら解説のためのものであって、本発明の技術的範囲を限定するものではない。
 上記目的を達成するために、本発明は遊星歯車機構の太陽歯車と内歯車との間に遊星2段歯車が配列された減速機構において、太陽歯車と内歯車との間に前記遊星2段歯車の大歯車あるいは小歯車と互いに噛み合う小歯車あるいは大歯車を備える少なくとも1個の遊星2段歯車を配列して減速機構を構成している。
 以上の説明から明らかなように、本発明にあっては次に列挙する効果が得られる。
(1)請求項1によって、太陽歯車と内歯車との間に前記遊星2段歯車の大歯車あるいは小歯車と互いに噛み合う小歯車あるいは大歯車を備える少なくとも1個の遊星2段歯車を配列したので、偏荷重が発生した時に、軸がぶれたりするのを確実に防止することができるとともに、大きな減速ができ、高トルク出力が得られ、減速部分を薄型で、小型・軽量化を図ることができる。
(2)請求項2も前記(1)と同様な効果が得られるとともに、遊星2段歯車の大歯車と小歯車のギヤ比を非整数倍としたので、減速機構全体の減速比(ギヤ比)を細かく設定することができるため、設計の自由度を大幅に向上することができる。
すなわち、決まった外径(大きさ)に対して、任意なギヤ比が選択できる機会が得られる。
(3)請求項3も前記(1)、(2)と同様な効果が得られるとともに遊星2段歯車の小歯車あるいは大歯車の位置関係が上下反転するように該遊星2段歯車を水平方向に配列したので、厚みを増すことなく減速比を高くすることができる。
(4)請求項4も前記(1)乃至(3)と同様な効果が得られるとともに、遊星2段歯車の大歯車と小歯車のモジュール(歯の大きさ)を異なる値とするとともに、更なる小型化を図ることができる。
図2の1-1線に沿う断面図。 本発明を実施するための第1の形態の平面図。 本発明を実施するための第1の形態の底面図。 本発明を実施するための第1の形態の減速機構の説明図。 本発明を実施するための第1の形態の太陽歯車の説明図。 本発明を実施するための第1の形態の第1の遊星2段歯車の説明図。 本発明を実施するための第1の形態の第2の2段歯車の説明図。 本発明を実施するための第1の形態の第1の遊星歯車の説明図。 本発明を実施するための第1の形態の減速機構の取付け状態の平面図。 図9の10-10線に沿う断面図。 図9の11-11線に沿う断面図。 図10の12-12線に沿う断面図。 本発明を実施するための第1の形態の歯車の組み合わせを模式的に示した図。 本発明を実施するための第2の形態の歯車の組み合わせを模式的に示した図。
1、1A、1B:ギヤモータ、 2:アウターロータ型のモータ、 
3:ロータ、    4:空間、
5:エンコーダ収納室、  6:モータベース、
8:ビス、          9:ベアリング収納ケース、
10:遊星歯車収納ケース、
11:シャフト、   12:太陽歯車、
13:センサベース、  14:キャリアマウント、
15:ボールベアリング、  16:大歯車、
17:小歯車、     18:第1の遊星2段歯車、
19:内歯車、
21:遊星ギヤシャフト、  22:ボールベアリング、
23:遊星歯車、  24:軸、
25:アブソリュートセンサ、 26:ボールベアリング、
28:ボールベアリング、
29:ボールベアリング、  30:メインマグネット、
31:外筒、    32:鉄心、
39:マグネット取付けリング、 40:リング状のマグネット、
41、41A、41B:減速機構、
42:大歯車、        43:小歯車、
44:第2の遊星2段歯車、  45:大歯車、
46:小歯車、   47:第3の遊星2段歯車。
 以下、図面に示す本発明を実施するための形態により、本発明を詳細に説明する。
 図1ないし図12に示す本発明を実施するための第1の形態において、1は薄型で、小型・軽量化を図った本発明のギヤモータで、このギヤモータ1はアウターロータ型のモータ2と、このアウターロータ型のモータ2のロータ3の中心部に存在する自由な空間4に入り込むエンコーダ収納室5が形成されたモータベース6、このモータベース6に出力軸となる遊星キャリアの一部を構成するキャリアマウント14を介して複数のビス8で固定された浅皿状のベアリング収納ケース9とからなる遊星歯車収納ケース10と、前記アウターロータ型のモータ2に用いた前記遊星歯車収納ケース10内に位置するシャフト11と、前記遊星歯車収納ケース10内に設けられた遊星歯車機構を用いた減速機構41と、前記キャリアマウント14に必要に応じて一体形成された前記シャフト11の軸心と同じ軸心となり、かつ前記遊星歯車収納ケース10より外方へ突出する筒状の出力軸として使用される軸24と、前記遊星歯車収納ケース10のエンコーダ収納室5と対応する部位の、前記キャリアマウント14とともに遊星キャリアを構成するセンサベース13に3本のビス39a、39a、39aで取付けられたマグネット取付けリング39と、このマグネット取付けリング39に取付けられたアブソリュートセンサに位置情報を与えるように側面に着磁された回転位置情報記録体としてのリング状のマグネット40と、前記遊星歯車収納ケース10のエンコーダ収納室5内の前記リング状のマグネット40と対応する部位の壁面に設けた、減速後の出力軸と一体的に回転するセンサベース13の回転角度を検出可能な磁気式のアブソリュートセンサ25と、前記シャフト11の下端部寄りの部位と前記遊星歯車収納ケース10のモータベース6の下端部との間に介装されたボールベアリング26と、前記軸24の根元部の外周部と前記遊星歯車収納ケース10のベアリング収納ケース9との間に介装されたボールベアリング28と、キャリアマウント14の内壁面と前記シャフト11の上端部との間に介装されたボールベアリング29とで構成されている。
 前記減速機構41は前記シャフト11の前記遊星歯車収納ケース10内に位置する部位に固定されたはすば歯車を用いた、例えば歯数が9個の太陽歯車12と、前記遊星歯車収納ケース10内に一体となって回転するように設けられたセンサベース13および出力軸となるキャリアマウント14と、前記遊星歯車収納ケース10内に位置する部位のアウターロータ型のモータ2のシャフト11に固定された太陽歯車12と噛み合うように、前記センサベース13およびキャリアマウント14に両端部がボールベアリング15、15を介して支持される複数個、本発明の実施の形態では3個のはすば歯車を用いた、例えば歯数が21個の大歯車16、16、16および、この大歯車16、16、16の軸心と同じ軸心となるようにそれぞれ設けられた、例えば歯数が9個の小歯車17、17、17とからなる第1の遊星2段歯車18、18、18と、この第1の遊星2段歯車18、18、18と水平方向に配列された該第1の遊星2段歯車18、18、18の小歯車17、17、17と噛み合う、前記センサベース13および出力軸となるキャリアマウント14に両端部がボールベアリング15、15を介して支持される複数個の、例えば歯数が21個の大歯車42、42、42、およびこの大歯車42、42、42の軸心と同じ軸心となるようにそれぞれ設けられた、例えば歯数が7個の小歯車43、43、43とからなる第2の遊星2段歯車44、44、44と、この第2の遊星2段歯車44、44、44の小歯車43、43、43と噛み合うとともに、前記遊星歯車収納ケース10の内壁面10aに固定された内歯車19と噛み合う前記センサベース13およびキャリアマウント14に取付けられた遊星ギヤシャフト21、21、21にボールベアリング22、22、22を介して回転可能に取付けられた、例えば歯数が20個の遊星歯車23、23、23とで構成されている。
 なお、第1の遊星2段歯車18、18、18は大歯車16、16、16と小歯車17、17、17とが整数倍の歯数の歯車や、整数倍でない歯数の歯車を使用することができる。
 例えば、歯数が9個の太陽歯車12と歯数が75個の内歯車19を用いた場合において、第1の遊星2段歯車18、18、18のそれぞれの大歯車16、16、16と小歯車17、17、17の歯数を整数倍とした場合、
第1の遊星2段歯車18の大歯車16は14、小歯車17は7
第2の遊星2段歯車44の大歯車42は14、小歯車43は7とすると、
全体のギヤ比(減速比)は34.3となり、
第1の遊星2段歯車18の大歯車16は14、小歯車17は7
第2の遊星2段歯車44の大歯車42は21、小歯車43は7に変えると、
全体のギヤ比(減速比)は51.0となる。
このように最少の単位でギヤの歯数を変更しても全体のギヤ比(減速比)が大きく変わってしまう。
 これに対し、第1の遊星2段歯車18、18、18のそれぞれの大歯車16、16、16と小歯車17、17、17の歯数を非整数倍とした場合、
第1の遊星2段歯車18の大歯車16は35、小歯車17は32
第2の遊星2段歯車44の大歯車42は35、小歯車43は34とすると、
全体のギヤ比(減速比)は10.4となり、
第1の遊星2段歯車18の大歯車16は35、小歯車17は32
第2の遊星2段歯車44の大歯車42は35、小歯車43は33に変えると、
全体のギヤ比(減速比)は10.7となる。
 このように、第1の遊星2段歯車18と第2の遊星2段歯車44のそれぞれの大歯車と小歯車の歯数を非整数倍とすることにより、また、第1の遊星2段歯車18と第2の遊星2段歯車44のそれぞれのギヤ比を適宜選定する事により、全体のギヤ比(減速比)を0.1ずつ微調整することも可能となるため、減速機構全体の大きさに制限がある場合にも自由な設計が可能となり、全体のギヤ比(減速比)を微調整できることから、通常であれば、最適なトルクが得られるように、モータそのものを変更しなければならないような状況であってもモータを変更することなく対応することができるため、設計自由度の向上と大幅なコストダウンを図ることができる。
 なお、非整数倍の歯数とした場合、組み立て用の位置合わせ用の印をつけておくことにより、正確且つ簡単に組み立てることができる。
 また、第2の遊星2段歯車44、44,44も大歯車42,42,42と小歯車43、43、43が前記第1の遊星2段歯車18、18、18と同様に整数倍の歯数の歯車と整数倍でない歯数の歯車を用いることができる。
前記ロータ3は中心にシャフト11が固定され、外周に配置されたメインマグネット30を覆う外筒31で構成されており、32は鉄心である。
 上記構成のギヤモータ1を駆動させるとロータ3、シャフト11が回転する。
このシャフト11の回転によって、シャフト11に固定されているはすば歯車を用いた太陽歯車12が回転し、該太陽歯車12の回転によって複数個の第1の遊星2段歯車18、18、18のはすば歯車を用いた大歯車16、16、16および小歯車17、17、17が減速回転し、該小歯車17、17、17と噛み合う複数個の第2の遊星2段歯車44、44、44の大歯車42、42、42および小歯車43、43、43が減速回転し、該複数個の第2の遊星2段歯車44、44、44の小歯車43、43、43と内歯車19と噛み合う遊星歯車23、23、23が回転する。
 この遊星歯車23、23、23の内歯車19に噛み合って回転することにより、遊星キャリアとしてのセンサベース13およびキャリアマウント14が回転し、該キャリアマウント14に複数のビスで固定された軸24が回転する。
 このためアウターロータ型のモータ2のシャフト11の回転は、太陽歯車12と第1の遊星2段歯車18、18、18の大歯車16、16、16との噛み合い、第1の遊星2段歯車18、18、18の小歯車17、17、17と第2の遊星2段歯車44、44、44の大歯車42、42、42との噛み合い、第2の遊星2段歯車44、44、44の小歯車43、43、43と遊星歯車23、23、23との噛み合いおよび遊星歯車23、23、23と内歯車19、19、19との噛み合い関係で減速できるため、減速の範囲を大きく設定することができるとともに、第1の遊星2段歯車18、18、18および第2の遊星2段歯車44、44、44を用いることにより、歯車の強度を持たせた状態で、薄型で小型・軽量化を図ることができる。
 また、遊星歯車収納ケース10のアウターロータ型のモータ2のロータ3の中心部に存在する自由な空間4に入り込むエンコーダ収納室5内にアブソリュートセンサ25が配置されるとともに、エンコーダ収納室5内の該アブソリュートセンサ25と対応する部位のセンサベース13にマグネット取付けリング39を介して取付けられたリング状のマグネット40によって、減速後の出力軸の回転角度を検出することができる。
 なお、アブソリュートセンサ25としては、ここに示した磁気式の他に、光学式や静電容量式、接点式等、他の方式のセンサを用いることもできる。
 その場合には、アブソリュートセンサ25に位置情報を与える回転位置情報記録体も、その方式に合わせてスリット円盤等に適宜変更する。
 また、高トルク出力を必要とする等、歯車に負担がかかる場合には、オイル等の潤滑剤を用いることが一般的であるが、このオイルの飛散等があっても、正確に検出することができる磁気式のアブソリュートセンサ25を用いることが好ましい。
 また、第1の形態では、太陽歯車12と第1の遊星2段歯車18、18、18の大歯車16、16、16は、はすば歯車を用いたものとなっているが、平歯車ややまば歯車を用いてもよい。それ以外の歯車についても同様で、平歯車、はすば歯車、やまば歯車の何れであってもよい。
 更に、負荷が小さい歯車については、モジュール(歯の大きさ)の値を小さくしてもよいことが知られているが、本発明にあっては、第1の遊星2段歯車18、18、18の大歯車16、16、16と小歯車17、17、17のモジュールを異なる値に設定するとともに、大歯車16、16、16のモジュールの値と、この大歯車16、16、16に噛み合う太陽歯車12のモジュールの値を一致させ、小歯車17、17、17のモジュールの値と、この小歯車17、17、17に噛み合う第2の遊星2段歯車44の大歯車42、42,42のモジュールの値を一致させることにより、回転性能に何等劣化させることなく、減速機構を更に小型化することができる。
 これは、第2の遊星2段歯車44、44、44についても同様であり、大歯車42、42、42と小歯車43、43、43のモジュールを異なる値とすることもできる。
 以上のように構成されたギヤモータ1は内歯車19を固定することにより、キャリアマウント14を出力軸としたものであるが、遊星キャリアとしてのキャリアマウント14およびセンサベース13を固定することにより、内歯車19を出力軸とするように構成することもできる。
 このように、内歯車19を出力軸とする場合には、この内歯車と一緒に回転す
るようにアブソリュートセンサ25をエンコーダ収納室5内に配置する必要があ
る。
  [発明を実施するための異なる形態]
 次に、図14に示す本発明を実施するための異なる形態につき説明する。なお、これらの本発明を実施するための異なる形態の説明に当って、前記本発明を実施するための第1の形態と同一構成部分には同一符号を付して重複する説明を省略する。
 まず、図1ないし図12に示す本発明を実施するための第1の形態の歯車の組み合わせを模式的に示したものが図13である。
 そして、この図13と同様に第2の形態の歯車の組み合わせを模式的に示したものが図14となる。
図14に示す本発明を実施するための第2の形態において、本発明を実施するための第1の形態と主に異なる点は、第2の遊星2段歯車44、44、44の小歯車43、43、43と噛み合う大歯車45、45、45を備える第3の遊星2段歯車44、44、44を、該小歯車43、43、43と該大歯車45、45、45の位置関係が上下反転するように水平方向に配列したことであり、このように第3の遊星2段歯車44、44、44を配列したことにより、減速機能41の厚みを増すことなく、更に減速比を高くすることができる。
 また、第1の形態、第2の形態において、前記遊星歯車23,23,23を省略することができる。この場合、第1の形態では、第2の遊星2段歯車44,44,44の小歯車43,43,43と内歯車19とが噛み合い、第2の形態では第3の遊星2段歯車47、47、47の小歯車46、46、46と内歯車19とが噛み合う。
このように、遊星歯車23,23,23を省略することにより、減速機構41の直径を更に小さくすることができる。
 本発明は筋力アシスト装置等に使用される高トルク出力を有するギヤモータの減速機構および、この減速機構を用いたギヤモータを製造する産業で利用される。

Claims (4)

  1. 遊星歯車機構の太陽歯車と内歯車との間に遊星2段歯車が配列された減速機構において、太陽歯車と内歯車との間に前記遊星2段歯車の大歯車あるいは小歯車と互いに噛み合う小歯車あるいは大歯車を備える少なくとも1個の遊星2段歯車を配列したことを特徴とする減速機構。
  2. 少なくとも1個の遊星2段歯車の大歯車と小歯車のギヤ比を非整数倍としたことを特徴とする請求項1に記載の減速機構。
  3. 遊星2段歯車の大歯車あるいは小歯車と互いに噛み合うもう1つの遊星2段歯車の小歯車あるいは大歯車の位置関係が上下反転するように水平方向に配列したことを特徴とする請求項1又は請求項2に記載の減速機構。
  4. 少なくとも1個の遊星2段歯車の大歯車と小歯車のモジュールを異なる値としたことを特徴とする請求項1乃至請求項3の何れか一つに記載の減速機構。
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