JP4131629B2 - Electric motor with reduction gear and adjustment method thereof - Google Patents

Description

を満足するように決定する。ただし、安全率Ｓについては設計要求の内容により決めるものとする。
【００４１】
本願発明者等は、電動機１０の出力軸１２を片持ち梁に近似して、負荷を与えた場合の撓み量Ｖを計算すると共に、ねじりと曲げモーメントを受ける軸の計算から限界撓み量Ｃを計算した。
【００４２】
電動機１０の出力軸１２は、図４（ａ）に示すように、２個の軸受１４Ａ、１４Ｂで支承されている。出力軸１２の歯車１２Ａの軸径をｄ１［ｍｍ］、長さをａ［ｍｍ］とし、歯車１２Ａに連続する部分の軸径をｄ２［ｍｍ］、長さをＬ１［ｍｍ］とし、軸受１４Ａ、１４Ｂの支承部分の軸径をｄ３［ｍｍ］、長さをＬ３［ｍｍ］とする。
【００４３】
出力軸１２の歯車１２Ａに力Ｆが加わると、軸受１４Ａ、１４Ｂにおいて反力Ｒm1、Ｒm1を受ける。したがって、この出力軸１２は、図４（ｂ）に示すように、軸受１４Ｂの支承部分を固定端とし、歯車１２Ａの端部を自由端とする長さＬ１の片持ち梁に近似できる。
【００４４】
近似した片持ち梁の自由端に力Ｆを加えた場合の撓み量Ｖは次式により計算される。
【００４５】
Ｖ＝（Ｆ・Ｌ１³）／（３ＥＩ）
ただし、Ｅ：出力軸１２の縦弾性係数
Ｉ：出力軸１２の断面２次モーメント
Ｉ＝π×ｄ１³ ／６４
例えば、出力軸１２をＳＵＳ３０３で形成し（Ｅ＝１９７００Ｎ／ｍｍ²）、Ｌ１＝１６ｍｍ、ｄ１＝３．８４ｍｍとした場合、上述した式は、

となるから、片持ち梁の自由端に加える力Ｆと片持ち梁の撓み量Ｖは、図５のグラフに示すようになる。
【００４６】
電動機１０の出力軸１２の歯車１２Ａの噛み合い振れが１０μｍ、平歯車２４の歯車部２４Ａの噛み合い振れが１０μｍの場合には、出力軸１２の撓み量Ｖが２０μｍ近くになるように調整すればいいので、図５から、出力軸１２に加える力Ｆを８〜１０Ｎ程度にすればよい。
【００４７】
限界撓み量Ｃについては、出力軸１２はシャフト径が変わる段付き丸棒であるため、その段差部分に応力が集中する。出力軸１２の軸折れ強度の安全率Ｓ＝２とし、出力軸１２の形成材料であるＳＵＳ３０３の疲れ限度（２４ｋｇ／ｍｍ²）、引っ張り強さ（６３ｋｇ／ｍｍ²）を考慮し、かつ、電動機による荷重成分３．８４ｋｇを考慮すると、出力軸１２が折れない限界の力Ｆmaxは２６Ｎとなることが計算される。上述した式に限界の力Ｆmaxを代入すると、

となり、限界撓み量Ｃ＝６５μｍとなることがわかる。
【００４８】
限界撓み量Ｃ＝６５μｍ、歯車１２Ａの噛み合い振れが１０μｍ、歯車２４Ａの噛み合い振れが１０μｍのとき、上述した式、Ｃ＞Ａ＋Ｂ＋α、｛Ｃ／（Ａ＋Ｂ＋α）｝≧Ｓは、は、
６５＞１０＋１０＋α
｛６５／（１０＋１０＋α）｝≧２
となり、これから、α≦１２．５μｍとなる。
【００４９】
したがって、上述した式、（Ａ＋Ｂ）＋α＞Ｖ≧Ａ＋Ｂから、
３２．５＞Ｖ≧２０
となる。したがって、撓み量Ｖは３２．５μｍより小さく、２０μｍ以上である必要がある。
【００５０】
更に、出力軸１２を撓ませすぎると、歯車の歯面同士が強く当たりすぎて回転が重くなったり、歯面が摩耗しやすくなるので、歯車１２Ａと歯車部２４Ａの軸間距離が最大限に変化してもバックラッシが生じないように、出力軸１２の撓み量Ｖ［ｍｍ」が、次式
Ｖ≒Ａ＋Ｂ
に近くなるように調整することが望ましい。
【００５１】
なお、出力軸１２に加える力Ｆは噛み合う歯車の加工精度によるので、もし、電動機１０の出力軸１２の歯車１２Ａの噛み合い振れも、平歯車２４の歯車部２４Ａの噛み合い振れも共に０μｍの場合には、出力軸１２に加える力Ｆは０Ｎ近くの値でよい。
【００５２】
（減速機付き電動機の調整方法）
本実施形態の減速機付き電動機の調整方法について、図６乃至図９を用いて説明する。図６乃至図９の各図において（ａ）は断面図（ｂ）は平面図である。
【００５３】
まず、図６に示すように、減速機付き電動機の減速機２０を治具である取付板５０に取り付ける。このとき減速機２０を固定するため、押さえ板５２を介してトグルクランプ５４により上から減速機２０を押さえつける。
【００５４】
次に、図７に示すように、減速機２０の予め決められた位置に設けられたピン用孔（図示せず）に調整用のピン４８を挿入する。このときピン４８を余り強く押し込まないようにする。
【００５５】
次に、図８に示すように、電動機１０のピン用孔（図示せず）に調整用のピン４８が挿入されるように、減速機２０に電動機１０を装着する。電動機１０の底部に垂直下方の力Ｇを加え、その後、電動機１０の側面に水平方向の力Ｆを加える。水平方向の力Ｆは、上述した計算式により予め求めた値、例えば、８〜１０Ｎとし、垂直方向の力Ｇは、電動機１０が水平方向の力Ｆにより傾かないように力Ｆと同程度かそれ以上の値、例えば、１０Ｎとする。なお、力Ｆ、Ｇの値は、時間と共に少しずつ変化するので、最初に設定した値を加え、それ以降に力の調整は行わないようにする。
【００５６】
次に、図９に示すように、電動機１０に力を加えた状態で、ねじ３６Ａ、３６Ｂを挿入して減速機２０の電動機１０をねじ止めする。ねじ３６Ａ、３６Ｂの先端に接着剤を塗布してねじ込み予定のトルクでねじ締めを行う。
【００５７】
最後に、トグルクランプ５４を緩めて、組み立てられた減速機付き電動機を取付板５０から取り外す。
【００５８】
このように本実施形態によれば、電動機の出力軸の撓みを利用したので、簡単な調整によりバックラッシを無くすことができ、局所的に歯車同士のかみ合いにばらつきがある場合でも滑らかで無理のない回転が可能である。
【００５９】
また、本実施形態は構造が非常にシンプルであるので、部品点数を削減でき、コストの低減を図ることができると共に、従動側の歯車の歯数を変えるだけで様々な減速比の減速機付き電動機を容易に実現することができる。
【００６０】
また、本実施形態はギアケースと歯車に貫通孔を形成してギアケースの一面に被駆動部材を取り付ける部材取付手段を設けたので、様々な用途に応じた様々な形状の被駆動部材を取り付けて駆動することができる。
【００６１】
本発明は上記実施形態に限らず種々の変形が可能である。例えば、上記実施形態では、電動機の所定位置をギアケースに固定するためにピンを用いたが、他の固定手段を用いてもよい。また、大型の電動機の場合には、ピン等の固定手段を用いて固定することなく、電動機自体を平行移動して軸間距離を詰めて調整してもよい。
【００６２】
【発明の効果】
以上の通り、本発明によれば、バックラッシを無くすための調整が簡単で、大きな減速比を実現することができ、また、様々な用途に応じた様々な形状の被駆動部材であっても駆動することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態による減速機付き電動機の構成を示す図である。
【図２】本発明の一実施形態による減速機付き電動機を組み込んだ駆動機構の具体例を示す図である。
【図３】本発明の一実施形態による減速機付き電動機の調整機構についての説明図である。
【図４】本発明の一実施形態による減速機付き電動機の調整撓み量についての説明図である。
【図５】本発明の一実施形態による減速機付き電動機の調整撓み量についての説明図である。
【図６】本発明の一実施形態による減速機付き電動機の調整方法の説明図（その１）である。
【図７】本発明の一実施形態による減速機付き電動機の調整方法の説明図（その２）である。
【図８】本発明の一実施形態による減速機付き電動機の調整方法の説明図（その３）である。
【図９】本発明の一実施形態による減速機付き電動機の調整方法の説明図（その４）である。
【図１０】従来の減速機付き電動機の構成を示す図である。
【図１１】従来の減速機付き電動機による被駆動部材の駆動方法の説明図である。
【符号の説明】
１０…電動機
１２…出力軸
１４Ａ、１４Ｂ…軸受
２０…減速機
２２…ギアケース
２４…平歯車
２４Ａ…歯車部
２４Ｂ、２４Ｃ…軸部
２４Ｄ…取付用ねじ孔
２６Ａ、２６Ｂ…軸受
２８…スラストねじ
３０、３２…グリス吸収フェルト
３４…貫通孔
３６Ａ、３６Ｂ…ねじ
４０…取り付け板
４２…被駆動部材
４４…処理ステーション
４６…エアチューブ
４８…ピン
５０…取付板
５２…押さえ板
５４…トグルクランプ
１００…減速機
１０２…ギアケース
１０４…減速機の出力軸
１０６…中間軸
１０８Ａ、１０８Ｂ…軸受
１１０…歯車
１１２…テーパー歯車
１１２Ａ、１１２Ｂ…軸受
１１４…テーパー歯車
１２０…電動機の出力軸
１２０Ａ…歯車
１３０…減速機付き電動機
１３２…出力軸
１３４…プーリ
１３６…被駆動部材
１３８…処理ステーション
１４０…エアチューブ
１４２…取付部材
１４４Ａ、１４４Ｂ…軸受
１４６…パイプ
１４８…プーリ
１５０…ベルト[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor with a speed reducer that decelerates rotation of an output shaft of an electric motor and rotates a driven member, and a method for adjusting the electric motor with the speed reducer.
[0002]
[Prior art]
A conventional electric motor with a reduction gear is shown in FIG. A reduction gear 100 is assembled to an electric motor (not shown) to constitute an electric motor with a reduction gear. The reduction gear 100 reduces the rotation of the output shaft 120 of the electric motor and transmits it to the output shaft 104 of the reduction gear 100 by a gear reduction mechanism provided in the gear case 102.
[0003]
An intermediate shaft 106 is provided in the gear case 102. The intermediate shaft 106 is rotatably supported with respect to the gear case 102 by two bearings 108A and 108B. The intermediate shaft 106 is provided with a gear 110 that meshes with the gear 120A of the output shaft 120 of the electric motor, and a tapered gear 112 that continuously changes the shift variable.
[0004]
An output shaft 104 is provided in the gear case 102, and the output shaft 104 is rotatably supported with respect to the gear case 102 by two bearings 112A and 112B. The output shaft 104 is provided with a tapered gear 114 that meshes with a tapered gear 112 provided on the intermediate shaft 106.
[0005]
When the output shaft 120 of the electric motor rotates, the output shaft 120 rotates through the gear 110, the taper gear 112, and the taper gear 114.
[0006]
In order to eliminate gear backlash, an adjustment screw 105 is provided at the end of the intermediate shaft 106. The adjustment screw 105 is adjusted so as to eliminate the backlash by slightly moving the intermediate shaft 106 in the axial direction.
[0007]
As described above, in the conventional electric motor with a reduction gear, variation in machining accuracy due to machining error and assembly error is inevitable. Therefore, the taper gears 112 and 114 are used and the intermediate shaft 106 is moved in the axial direction by the adjusting screw 105. Therefore, there was a problem that adjustment had to be made to eliminate backlash.
[0008]
Moreover, in the conventional electric motor with a reduction gear, it is common that an output shaft is a shaft shape. For this reason, when driving a driven member having a hole in the center, as shown in FIG. 11, a driving method using a belt / pulley has been proposed.
[0009]
In this method, a pulley 134 is attached to the output shaft 132 of the motor 130 with a speed reducer. The driven member 136 is provided with a plurality of processing stations 138 along the circumference thereof. The air tube 140 is required for processing at each processing station 138, and the air tube 140 passes through the center of the driven member 136 so as not to disturb the work.
[0010]
The driven member 136 is rotatably attached to the attachment member 142 by bearings 144A and 144B. A pipe 146 for passing the air tube 140 is provided in the center of the driven member 136. A pulley 148 is attached to the pipe 146. The belt 150 is hung between the pulley 134 of the output shaft 132 and the pulley 148 of the pipe 146, and the driven member 136 is driven by belt driving.
[0011]
As described above, the conventional electric motor with a reduction gear has a problem that in order to drive a driven member having a hole in the center, a complicated mechanism is required and many parts are required. Although the driven member can be directly driven by the direct drive motor, the direct drive motor is expensive and requires tuning such as gain adjustment.
[0012]
[Problems to be solved by the invention]
Thus, the conventional electric motor with a reduction gear has a problem that adjustment for eliminating backlash is difficult, and a shape of a driven member to be rotated is defined by the structure of the reduction gear.
[0013]
An object of the present invention is to provide an electric motor with a reduction gear that can be easily adjusted to eliminate backlash and can realize a large reduction ratio, and an adjustment method thereof.
[0014]
Another object of the present invention is to provide an electric motor with a reduction gear that can be driven even with driven members having various shapes according to various applications.
[0015]
[Means for Solving the Problems]
The object is to be accommodated in the electric motor, the output shaft rotated by the electric motor and chopped by the first number of teeth, the gear case, and the gear case so as to be rotatable, and larger than the first number of teeth. A gear that is geared with a second number of teeth and meshes with the output shaft, a through-hole that penetrates the gear case and the gear is formed, and the gear case is located at a predetermined position outside the through-hole. A gear mounted with an electric motor and geared with the second number of teeth extends to a surface opposite to the mounting surface of the electric motor, and a member mounting means for mounting a driven member is provided on the surface. This is achieved by an electric motor with a speed reducer.
[0016]
The object is to be accommodated in the electric motor, the output shaft rotated by the electric motor and chopped by the first number of teeth, the gear case, and the gear case so as to be rotatable, and larger than the first number of teeth. A gear that is chopped by a second number of teeth and meshes with the output shaft; and a fixing means that fixes a predetermined position of the motor to the gear case. By moving with respect to the gear case, the amount of deflection of the output shaft of the motor is substantially equal to the total value of the meshing runout of the teeth of the output shaft and the meshing runout of the teeth of the gear. This is achieved by an electric motor with a speed reducer , wherein the output shaft is attached to the gear by being urged .
[0020]
The object is to be accommodated in the electric motor, the output shaft rotated by the electric motor and chopped by the first number of teeth, the gear case, and the gear case so as to be rotatable, and larger than the first number of teeth. A method of adjusting an electric motor with a reduction gear having a gear cut by a second number of teeth and meshing with the output shaft, wherein an amount of deflection of the output shaft of the electric motor is a meshing vibration of the teeth of the output shaft. This is achieved by an adjustment method for an electric motor with a reduction gear, wherein the output shaft of the electric motor is urged and attached to the gear so as to be substantially equal to the total value of the meshing vibrations of the gear teeth.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
An electric motor with a reduction gear according to an embodiment of the present invention will be described with reference to the drawings.
[0022]
(Configuration of motor with reduction gear)
The structure of the electric motor with a reduction gear of this embodiment is demonstrated using FIG. FIG. 1 is a view showing an electric motor with a reduction gear according to the present embodiment, in which FIG. 1 (a) is a plan view, FIG. 1 (b) is a cross-sectional view, and FIG. 1 (c) is a bottom view.
[0023]
A reduction gear 20 is assembled to the electric motor 10 to constitute an electric motor with a reduction gear. The output shaft 12 of the electric motor 10 is rotatably supported by two bearings 14A and 14B, and its end is a free end that is not supported by the bearings. The end of the output shaft 12 is geared to form a gear 12A.
[0024]
In the speed reducer 20, a driven side spur gear 24 is incorporated in the gear case 22. The spur gear 24 protrudes from the center of the circumference, and the protruding portion is cut out to form a gear portion 24A. The gear portion 24A meshes with the gear 12A of the output shaft 12 of the electric motor 10.
[0025]
Shaft portions 24B and 24C are provided on the upper surface side and the lower surface side of the gear portion 24A of the spur gear 24, respectively. On the lower surface of the spur gear 24, a mounting screw hole 24D for mounting the driven member is formed.
[0026]
The shaft portions 24B and 24C of the spur gear 24 are rotatably supported with respect to the gear case 102 by two bearings 26A and 26B, respectively. The diameter of the shaft portion 24B on the upper surface side of the spur gear 24 is smaller than the diameter of the shaft portion 24C on the lower surface side. A thrust screw 28 is fitted into the shaft portion 24C in order to fix the bearing 26B on the lower surface side.
[0027]
A grease absorbing felt 30 is enclosed between the bearing 26A on the upper surface side and the inner surface of the gear case 22, and a grease absorbing felt 32 is enclosed between the bearing 26B on the lower surface side and the thrust screw 28.
[0028]
The gear case 22 and the spur gear 24 are formed with a through hole 34 penetrating the center thereof. The through hole 34 allows the wiring, the tube, and the like to pass through the center of the speed reducer 20.
[0029]
The electric motor 10 is attached to the upper surface outside the through hole 34 so as not to obstruct the wiring or tube passing through the through hole 34 of the gear case 22. The electric motor 10 is fixed to the gear case 22 with two screws 36A and 36B.
[0030]
(Specific example of drive mechanism)
Next, a specific example of a drive mechanism incorporating the electric motor with a reduction gear according to the present embodiment will be described with reference to FIG.
[0031]
In this specific example, the electric motor with a reduction gear of the present embodiment is fixed to the mounting plate 40. The driven member 42 has a circular shape and is attached using the attachment screw hole 24 </ b> D on the lower surface of the spur gear 24.
[0032]
The driven member 42 is provided with a plurality of processing stations 44 along its circumference. A circular driven member 42 is intermittently rotated to the left and right to perform a series of processes at each processing station 44. In the case of this specific example, an air tube 46 is required for processing at each processing station 44, and the air tube 46 needs to be connected to an external air supply device (not shown). In this specific example, an air tube 46 from each processing station 44 is passed through a through hole 34 formed in the center of the motor with a speed reducer. For this reason, even if the driven member 42 rotates, the work can be performed without the air tube 46 getting in the way.
[0033]
(Adjustment mechanism of motor with reduction gear)
Next, the adjustment mechanism of the motor with a reduction gear according to the present embodiment will be described with reference to FIG.
[0034]
In the electric motor with a speed reducer of the present embodiment, the bending of the output shaft 12 of the electric motor 10 is used to eliminate backlash between the gear 12A formed on the output shaft 12 of the electric motor 10 and the gear portion 24A of the spur gear 24. Since the end portion of the output shaft 12 of the electric motor 10 is a free end that is not supported by a bearing, it is bent when a force is applied to the output shaft 12. Using this deflection, smooth rotation is realized while eliminating backlash.
[0035]
The gear 12A of the output shaft 12 of the electric motor 10 and the gear portion 24A of the spur gear 24 are swung with respect to the rotation center due to processing errors. If the amount of deflection is large, when the backlash is adjusted by meshing the gears to increase the distance between the shafts, the gears do not rotate smoothly. In the present embodiment, even if the gear 12 </ b> A and the gear portion 24 </ b> A are shaken, the change in the inter-axis distance between the gear 12 </ b> A and the gear portion 24 </ b> A due to the shake is absorbed by the deflection of the output shaft 12 of the electric motor 10.
[0036]
In order to bend the output shaft 12 of the electric motor 10, the attachment position of the electric motor 10 to the gear case 22 is adjusted. As shown in FIG. 3, when the electric motor 10 is attached to the gear case 22, one of the four corners of the electric motor 10 is fixed by pins 48. The attachment position is adjusted by applying a force indicated by an arrow to a corner on the opposite corner of the corner fixed by the pin 48 of the electric motor 10. When force is applied, the electric motor 10 rotates around the pin 48, and this rotation causes the gear 12A of the output shaft 12 of the electric motor 10 to be pressed against the gear portion 24A of the spur gear 24, thereby eliminating backlash between the gears. it can.
[0037]
(Adjustment deflection amount)
Next, the adjustment deflection amount of the electric motor with a reduction gear according to the present embodiment will be described with reference to FIGS. 4 and 5.
[0038]
In the present embodiment, the output shaft 12 of the electric motor 10 is bent in order to eliminate the backlash of the electric motor with a reduction gear. If the amount of deflection of the output shaft 12 at this time is larger than the maximum value of the change in the distance between the gears 12A and 24A, even if the distance between the gears 12A and 24A changes, The state where the gear 12A of the output shaft 12 of the electric motor 10 is pressed against the gear portion 24A of the spur gear 24 can be maintained, and backlash does not occur.
[0039]
However, if the distance between the shafts of the gear 12A and the gear portion 24A changes so as to bend the output shaft 12, there is a risk that the output shaft 12 will break. Therefore, it is necessary to prevent the output shaft 12 from being bent even if the distance between the shafts of the gear 12A and the gear portion 24A changes to the maximum.
[0040]
Considering this, the meshing runout of the gear 12A of the output shaft 12 of the electric motor 10 is A [mm], the meshing runout of the gear portion 24A of the spur gear 24 is B [mm], and the limit deflection amount at which the output shaft 12 can be broken is set. When C [mm] and the safety factor against the bending of the output shaft 12 is S, the deflection amount V [mm] of the output shaft 12 is expressed by the following equation.

To be satisfied. However, the safety factor S is determined according to the contents of the design request.
[0041]
The inventors of the present application approximate the output shaft 12 of the electric motor 10 to a cantilever beam, calculate the amount of deflection V when a load is applied, and calculate the limit amount of deflection C from the calculation of the shaft that receives torsion and bending moment. Calculated.
[0042]
As shown in FIG. 4A, the output shaft 12 of the electric motor 10 is supported by two bearings 14A and 14B. The shaft diameter of the gear 12A of the output shaft 12 is d1 [mm], the length is a [mm], the shaft diameter of the portion continuing to the gear 12A is d2 [mm], the length is L1 [mm], and the bearing 14A , 14B has a shaft diameter d3 [mm] and a length L3 [mm].
[0043]
When a force F is applied to the gear 12A of the output shaft 12, the bearings 14A and 14B receive reaction forces Rm1 and Rm1. Therefore, as shown in FIG. 4B, the output shaft 12 can be approximated to a cantilever having a length L1 in which the support portion of the bearing 14B is a fixed end and the end portion of the gear 12A is a free end.
[0044]
The amount of deflection V when a force F is applied to the approximate free end of the cantilever is calculated by the following equation.
[0045]
V = (F · L1 ³ ) / (3EI)
However, E: longitudinal elastic coefficient of the output shaft 12 I: geometrical moment of inertia of the output shaft ^{12 I = π × d1 3/} 64
For example, when the output shaft 12 is formed of SUS303 (E = 19700 N / mm ² ) and L1 = 16 mm and d1 = 3.84 mm, the above-described equation is

Therefore, the force F applied to the free end of the cantilever and the deflection amount V of the cantilever are as shown in the graph of FIG.
[0046]
When the meshing runout of the gear 12A of the output shaft 12 of the electric motor 10 is 10 μm and the meshing runout of the gear portion 24A of the spur gear 24 is 10 μm, the deflection amount V of the output shaft 12 may be adjusted to be close to 20 μm. Therefore, from FIG. 5, the force F applied to the output shaft 12 may be about 8 to 10N.
[0047]
Regarding the limit deflection amount C, the output shaft 12 is a stepped round bar whose shaft diameter changes, and stress concentrates on the stepped portion. The safety factor S = 2 of the shaft bending strength of the output shaft 12, the fatigue limit (24 kg / mm ² ) and the tensile strength (63 kg / mm ² ) of SUS303, which is the material forming the output shaft 12, are taken into account, and the electric motor In consideration of the load component of 3.84 kg, the limit force Fmax at which the output shaft 12 cannot be broken is calculated to be 26N. Substituting the limit force Fmax into the above equation,

Thus, it can be seen that the limit deflection amount C = 65 μm.
[0048]
When the limit deflection amount C = 65 μm, the meshing runout of the gear 12A is 10 μm, and the meshing runout of the gear 24A is 10 μm, the above formula, C> A + B + α, {C / (A + B + α)} ≧ S
65> 10 + 10 + α
{65 / (10 + 10 + α)} ≧ 2
From this, α ≦ 12.5 μm.
[0049]
Therefore, from the above formula, (A + B) + α> V ≧ A + B,
32.5> V ≧ 20
It becomes. Therefore, the deflection amount V needs to be smaller than 32.5 μm and 20 μm or more.
[0050]
Furthermore, if the output shaft 12 is bent too much, the tooth surfaces of the gears will hit each other too strongly and the rotation will become heavy, and the tooth surfaces will be easily worn, so the distance between the shafts of the gear 12A and the gear portion 24A will be maximized. The deflection amount V [mm] of the output shaft 12 is expressed by the following formula V≈A + B so that backlash does not occur even if the change occurs.
It is desirable to adjust so that it is close to.
[0051]
The force F applied to the output shaft 12 depends on the processing accuracy of the meshing gear. Therefore, if both the meshing runout of the gear 12A of the output shaft 12 of the electric motor 10 and the meshing runout of the gear portion 24A of the spur gear 24 are 0 μm. The force F applied to the output shaft 12 may be a value close to 0N.
[0052]
(Adjustment method of motor with reduction gear)
The adjustment method of the electric motor with a reduction gear of this embodiment is demonstrated using FIG. 6 thru | or FIG. 6 to 9, (a) is a cross-sectional view (b) is a plan view.
[0053]
First, as shown in FIG. 6, the speed reducer 20 of the motor with a speed reducer is attached to an attachment plate 50 that is a jig. At this time, in order to fix the speed reducer 20, the speed reducer 20 is pressed from above by a toggle clamp 54 via a pressing plate 52.
[0054]
Next, as shown in FIG. 7, an adjustment pin 48 is inserted into a pin hole (not shown) provided at a predetermined position of the speed reducer 20. At this time, the pin 48 is not pushed too hard.
[0055]
Next, as shown in FIG. 8, the electric motor 10 is mounted on the reduction gear 20 so that the adjustment pin 48 is inserted into a pin hole (not shown) of the electric motor 10. A vertically downward force G is applied to the bottom of the electric motor 10, and then a horizontal force F is applied to the side surface of the electric motor 10. The horizontal force F is a value obtained in advance by the above-described calculation formula, for example, 8 to 10 N. Is the vertical force G about the same as the force F so that the electric motor 10 does not tilt due to the horizontal force F? A value higher than that, for example, 10N. Since the values of the forces F and G change little by little with time, the first set value is added and the force is not adjusted thereafter.
[0056]
Next, as shown in FIG. 9, with the force applied to the electric motor 10, screws 36 </ b> A and 36 </ b> B are inserted to screw the electric motor 10 of the speed reducer 20. An adhesive is applied to the tips of the screws 36A and 36B, and the screws are tightened with a torque to be screwed.
[0057]
Finally, the toggle clamp 54 is loosened, and the assembled electric motor with a reduction gear is removed from the mounting plate 50.
[0058]
As described above, according to the present embodiment, since the deflection of the output shaft of the motor is used, the backlash can be eliminated by simple adjustment, and even when there is a variation in the meshing between the gears, it is smooth and reasonable. Rotation is possible.
[0059]
In addition, since this embodiment has a very simple structure, the number of parts can be reduced, the cost can be reduced, and a reduction gear with various reduction ratios can be provided by simply changing the number of teeth of the driven gear. An electric motor can be easily realized.
[0060]
In addition, since the present embodiment is provided with a member attaching means for forming a through hole in the gear case and the gear and attaching the driven member to one surface of the gear case, the driven member having various shapes according to various uses is attached. Can be driven.
[0061]
The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the pin is used to fix the predetermined position of the electric motor to the gear case, but other fixing means may be used. Further, in the case of a large motor, the motor itself may be translated in parallel to reduce the distance between the axes without being fixed using fixing means such as pins.
[0062]
【The invention's effect】
As described above, according to the present invention, adjustment for eliminating backlash is easy, a large reduction ratio can be realized, and even driven members having various shapes according to various applications can be driven. can do.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an electric motor with a reduction gear according to an embodiment of the present invention.
FIG. 2 is a diagram showing a specific example of a drive mechanism incorporating a motor with a reduction gear according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram for an adjustment mechanism of a motor with a reduction gear according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram of an adjustment deflection amount of a motor with a reduction gear according to an embodiment of the present invention.
FIG. 5 is an explanatory diagram of an adjustment deflection amount of a motor with a reduction gear according to an embodiment of the present invention.
FIG. 6 is an explanatory diagram (No. 1) of a method for adjusting a motor with a reduction gear according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram (No. 2) of a method for adjusting a motor with a reduction gear according to an embodiment of the present invention.
FIG. 8 is an explanatory diagram (No. 3) of a method for adjusting an electric motor with a reduction gear according to an embodiment of the present invention.
FIG. 9 is an explanatory diagram (No. 4) of a method for adjusting a motor with a reduction gear according to an embodiment of the present invention.
FIG. 10 is a diagram showing a configuration of a conventional motor with a reduction gear.
FIG. 11 is an explanatory diagram of a driving method of a driven member by a conventional electric motor with a reduction gear.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Electric motor 12 ... Output shaft 14A, 14B ... Bearing 20 ... Reduction gear 22 ... Gear case 24 ... Spur gear 24A ... Gear part 24B, 24C ... Shaft part 24D ... Mounting screw hole 26A, 26B ... Bearing 28 ... Thrust screw 30 32 ... Grease absorbing felt 34 ... Through holes 36A, 36B ... Screw 40 ... Mounting plate 42 ... Driven member 44 ... Processing station 46 ... Air tube 48 ... Pin 50 ... Mounting plate 52 ... Holding plate 54 ... Toggle clamp 100 ... Deceleration Machine 102 ... gear case 104 ... output shaft 106 of reduction gear ... intermediate shaft 108A, 108B ... bearing 110 ... gear 112 ... taper gear 112A, 112B ... bearing 114 ... taper gear 120 ... output shaft 120A of motor ... gear 130 ... reduction gear Motor 132 with output shaft 134 with pulley 136 driven member 138 with processing station 1 0 ... air tube 142 ... mounting member 144A, 144B ... bearing 146 ... pipe 148 ... pulley 150 ... belt

Claims (3)

An electric motor,
An output shaft rotated by the electric motor and cut by a first number of teeth;
Gear case,
A gear housed rotatably in the gear case, geared with a second number of teeth greater than the first number of teeth, and meshed with the output shaft;
A through-hole penetrating the gear case and the gear is formed,
The electric motor is attached to a predetermined position outside the through hole of the gear case ,
The gear cut by the second number of teeth extends to a surface opposite to the mounting surface of the electric motor, and a member mounting means for mounting a driven member is provided on the surface. Electric motor with machine. An electric motor,
An output shaft rotated by the electric motor and cut by a first number of teeth;
Gear case,
A gear housed rotatably in the gear case, geared with a second number of teeth greater than the first number of teeth, and meshed with the output shaft;
Fixing means for fixing a predetermined position of the electric motor to the gear case;
By moving the electric motor with respect to the gear case in a state of being fixed by the fixing means, the amount of deflection of the output shaft of the electric motor is such that the meshing runout of the teeth of the output shaft and the meshing runout of the teeth of the gears. An electric motor with a speed reducer , wherein the output shaft of the electric motor is attached to the gear so as to be substantially equal to the total value of An electric motor, an output shaft that is rotated by the electric motor and cut by the first number of teeth, a gear case, and a second tooth that is rotatably accommodated in the gear case and has a larger number of teeth than the first number of teeth A method for adjusting an electric motor with a reduction gear having a gear that is geared with a number and meshes with the output shaft,
The output shaft of the motor is biased with respect to the gear so that the amount of deflection of the output shaft of the motor is substantially equal to the total value of the meshing runout of the teeth of the output shaft and the meshing runout of the teeth of the gear. And attach
A method for adjusting an electric motor with a speed reducer.

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