JP3635929B2 - Electric motor with gear reducer - Google Patents

Description

【０００１】
【発明の属する技術分野】
本発明は、機械設備などの機器の動力用に使用される歯車減速機付電動機に関するものである。
【０００２】
【従来の技術】
近年、モータはコンベアなどの動力用だけでなく、機器の中の狭い空間での用途が増えてきている。そのため電動機の小型化，軽量化，様々な方向への取付性向上の要望が強くなっている。また、より安価なものが望まれている。
以下、従来の歯車減速機付電動機の構造について図面を参照して説明する。
【０００３】
図４において、１１は歯車機構を有する歯車減速機であり、１１ａは歯車減速機１１の出力軸である。１２は歯車減速機１１を覆うギヤカバーである。１３は電動機部と歯車減速機を兼ねたフレームで、座１３ａと座１３ｂを有している。１４はフレーム１３に嵌合固着された固定子である。１５は電動機軸で、歯車側は歯車減速機１１の一段歯車と噛み合う一対のハスバ歯車となっている。１６は電動機軸１５を備えた回転子である。１７は電動機のブラケットである。１８は歯車側玉軸受、１９は反歯車側玉軸受であり、内輪をそれぞれ電動機軸１５に圧入固着している。
【０００４】
この組立方法は、フレーム１３の開口部１３ｃ側より、固定子１４と電動機軸１５に玉軸受１８，１９を固着した回転子１６を挿入し、ブラケット１７の嵌合孔１７ａにて玉軸受１９を保持し、かつブラケット１７の座１７ｂとフレーム１３の座１３ａにてネジ２０にて締結し電動機部を構成し、フレーム１３の開口部１３ｄ側より歯車減速機１１とギヤカバー１２を挿入し、フレーム１３の座１３ｂにてネジ２１にて締結することで歯車減速機部を構成する。通常、歯車減速機付電動機を組み立てる場合は、フレーム１３の開放部１３ｃ、もしくは１３ｄを上方向にして組み立てるため、電動機部もしくは歯車減速機部を組み立てる場合、フレーム１３を反転する必要がある。フレーム１３は、通常アルミにて作製されるため、開口部１３ｃ、１３ｄは加工を要する。またこの加工は、開放部１３ｃ、１３ｄが両側にあるため旋盤等で行なうときはフレーム１３を反転する必要があるため二工程となる。このため開放部１３ｃ、１３ｄの同心度の精度がでにくい構造となっている。この精度は数十μｍ以下の必要がある。またこの精度が悪いと、電動機軸１５と歯車減速機１１との噛み合いが悪くなるため歯車減速機付電動機の完成品にて騒音不良がでる場合がある。
【０００５】
【発明が解決しようとする課題】
上記従来の構成では、フレーム外周部にブラケットとギヤカバーを固定するネジ座のための突出部が必要となる。また、歯車減速機の固定位置も限定され、偏心した出力軸を有する歯車減速機の場合には、電動機の口出し部と出力軸との位置関係も限定されてしまう。このため狭い機器内で、この電動機を使用する場合に、この突出部が邪魔になり取付ができないという問題がある。また出力軸と口出し部の位置関係が限定されるため、機器への取付位置が限定される問題がある。さらに加工、組立において反転する作業が必要となるため作業性が悪く、特に加工において加工精度の確保が難しく、騒音不良につながる問題がある。
【０００６】
本発明は上記の課題を解決するもので、機器への取付性の向上と、加工性と組立作業性を向上させ安価で低騒音の歯車減速機付電動機を提供することを目的とする。
【０００７】
【課題を解決するための手段】
この課題を解決するために本発明は、開放端面の略四角形のフランジ部中央に孔部を有し、底部が一体で円筒状の筐体と、前記筐体の孔部に突起部が嵌合し、前記筐体のフランジ部外形と同じ輪郭のフランジを有するギヤカバーと、前記ギヤカバーの突起部に同心に固定した出力軸がフランジ部に対して偏心した歯車減速機とを備え、前記筐体の孔部で固定子と回転子と軸受を保持するブラケットとを固定して電動機部を構成し、前記歯車減速機を前記ブラケットに嵌合させ、前記ギヤカバーと前記筐体のフランジ部形状を重ね合わせて固定したものである。
【０００８】
【発明の実施の形態】
この課題を解決するために本発明は、開放端面の略四角形のフランジ部中央に孔部を有し、底部が一体で円筒状の筐体と、前記筐体の孔部に突起部が嵌合し、前記筐体のフランジ部外形と同じ輪郭のフランジを有するギヤカバーと、前記ギヤカバーの突起部に同心に固定した出力軸がフランジ部に対して偏心した歯車減速機とを備え、前記筐体の孔部で固定子と回転子と軸受を保持するブラケットとを固定して電動機部を構成し、前記歯車減速機を前記ブラケットに嵌合させ、前記ギヤカバーと前記筐体のフランジ部形状を重ね合わせて固定した歯車減速機付電動機である。
【０００９】
また、筐体のフランジ部にギヤカバーを固定する固定ネジ孔と、機器などに取り付ける取付孔をそれぞれ９０°間隔に設けるとともに、円筒状の外周に口出し孔を設け、ギヤカバーのフランジ部に前記筐体の固定ネジ孔と取付孔に合致する固定孔と取付孔を設け、前記２つのフランジ部を重ね合せて固定するとき、電動機の口出し線と歯車減速機の出力軸の位置を９０°間隔で相対的に可変できる請求項１記載の歯車減速機付電動機である。
【００１０】
このように、底部が一体で円筒状の筐体の孔部に電動機部と歯車減速器部を一方向から組込み、フランジ部を重ね合わせて固定するもので、組立作業性を向上させることができ、安価で低騒音の歯車減速機付電動機が得られる。
また、筐体フランジ部に対して偏心した出力軸の歯車減速機であっても、口出し線と出力軸の位置を９０°間隔で相対的に変更ができ、機器への取付性の向上を図ることができる。
【００１１】
【実施例】
以下、本発明の実施例について図面を参照して説明する。
図１，図２，図３において、１は歯車減速機、１ａは歯車減速機１の出力軸、４は巻線を有する固定子、５は電動機軸、６は回転子、７はブラケット、８，９は玉軸受で回転子６の電動機軸５を回転自在に支承する。これらの構成は従来とほぼ同じである。
【００１２】
２はギヤカバーで、略四角形のフランジ部２ａに、固定孔２ｂと取付孔２ｃがそれぞれ９０°間隔で設けてある。また筐体３の孔部３ｃに嵌合する環状の突起部２ｄを備え、この突起部２ｄと同心になるように後で歯車減速機１が組込まれる。
３は筐体で、略四角形のフランジ部３ａ，玉軸受８を保持する底部３ｂ，固定子４と回転子６とブラケット７とがそれぞれ嵌合する孔部３ｃを備え、フランジ部３ａに、固定ネジ孔３ｄと取付孔３ｅをそれぞれ９０°間隔で設けており、さらに、円筒状の外周部には口出し線の出口となる口出し孔３ｆを備えている。また、ギヤカバー２のフランジ部２ａと筐体３のフランジ部３ａは同形状で重ね合わせると９０°間隔の孔も重なり合うように配設してある。
【００１３】
次に歯車減速機付電動機の組立方法について説明すると、まず筐体３の孔部３ｃに固定子４の外周部を圧入により固定する。次に、玉軸受８，９を回転子６の電動機軸５に取り付け、ブラケット７と一緒に筐体３の孔部３ｃに嵌合させながら玉軸受８を底部３ｂに固定し、この後口出し孔３ｆから固定子４の巻線と接続した口出し線を外に出して電動機部を構成する。歯車減速機１はギヤカバー２の突起部２ｄを基準にして同心に固定され歯車減速機部を構成した後、筐体３の孔部３ｃ側からブラケット７に嵌挿する。この後、ギヤカバー２と筐体３のフランジ部を重ね合わせ、固定孔２ｂ側から固定ネジ孔３ｄにネジ１２でネジ固定して歯車減速機付電動機が完成する。
【００１４】
このとき、筐体フランジ部に対して出力軸が偏心した歯車減速機１であれば、口出し孔３ｆとの位置関係を決定した上で固定すればよく、筐体３の孔部３ｃを上方向にして、構成部品を全てを筐体３の孔部３ｃ側より挿入できるため、筐体３を反転する必要がなく一方向から組立ができるので大幅に組立作業性が向上する。
【００１５】
また、筐体３はアルミニウムにて作製され内径の加工を要するが、この加工において筐体３の孔部３ｃが一方向であるため旋盤等で行う場合に筐体３を反転する必要がなく、１回のチャッキングで加工できるので筐体３の内径加工精度を向上させ、例えば筐体３の内径の同心度の精度を十数μｍにすることができる。したがって、電動機軸５と歯車減速機１との噛み合いを良くすることができ、歯車減速機付電動機にしたときの騒音を低減できる。
【００１６】
以上のように、開放端面のフランジ部中央に孔部を有し底部が一体で円筒状の筐体にしたことで、電動機部と減速機部を筐体の孔部に一方向から組込みが可能になり、筐体の円筒部に固定のための突出部がない構造にできる。
また、筐体フランジ部に対して偏心した出力軸の歯車減速機でも、略四角形のフランジ部の固定孔と取付孔をそれぞれ９０°間隔にすることで、筐体の口出し孔に対して出力軸の位置を９０°間隔で相対的に変更することができる。
【００１７】
なお、ギヤカバーと筐体のフランジ部が略多角形の場合は、固定孔と取付孔はそれぞれの角度を３６０°／角数で求めた角度で等間隔に配設すればよく、フランジ部が円形であっても、同様に固定孔と取付孔を少しずらしてそれぞれ等間隔に配設すれば同様な効果が得られる。また、歯車減速機付電動機をギヤカバーと筐体のフランジ部を重ね合わた状態で機器に取り付けるので取付強度も確保できる。
【００１８】
【発明の効果】
上記の実施例から明らかなように請求項１記載の発明によれば、筐体の小型化と加工精度の向上が図れ、組立作業性の改善により安価で低騒音な歯車減速機付電動機が実現できる。
また、請求項２記載の発明によれば、フランジに対して偏心した出力軸を有する歯車減速機であっても、出力軸の位置が口出し孔に対して９０°間隔で相対的に変更することができる。
【図面の簡単な説明】
【図１】 本発明の一実施例における歯車減速機付電動機の断面図
【図２】 本発明の一実施例のギヤカバーの斜視図
【図３】 本発明の一実施例の筐体の斜視図
【図４】 従来の歯車減速機付電動機の断面図
【符号の説明】
１ 歯車減速機
２ ギヤカバー
３ 筐体
４ 固定子
６ 回転子
７ ブラケット
２ａ，３ａ フランジ部
２ｂ 固定孔
２ｃ，３ｅ 取付孔
３ｂ 底部
３ｃ 孔部
３ｄ 固定ネジ孔
３ｆ 口出し孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor with a gear reducer used for powering equipment such as mechanical equipment.
[0002]
[Prior art]
In recent years, motors are used not only for power such as conveyors but also in narrow spaces in equipment. For this reason, there is an increasing demand for smaller and lighter motors and improved mounting in various directions. Moreover, a cheaper one is desired.
Hereinafter, the structure of a conventional electric motor with a gear reducer will be described with reference to the drawings.
[0003]
In FIG. 4, 11 is a gear reducer having a gear mechanism, and 11 a is an output shaft of the gear reducer 11. A gear cover 12 covers the gear reducer 11. Reference numeral 13 denotes a frame that serves as an electric motor unit and a gear reducer, and has a seat 13a and a seat 13b. Reference numeral 14 denotes a stator fitted and fixed to the frame 13. Reference numeral 15 denotes an electric motor shaft, and the gear side is a pair of helical gears that mesh with the first gear of the gear reducer 11. Reference numeral 16 denotes a rotor provided with an electric motor shaft 15. Reference numeral 17 denotes an electric motor bracket. Reference numeral 18 denotes a gear side ball bearing, and reference numeral 19 denotes a counter gear side ball bearing. The inner rings are press-fitted and fixed to the motor shaft 15 respectively.
[0004]
In this assembling method, the rotor 16 having ball bearings 18 and 19 fixed to the stator 14 and the motor shaft 15 is inserted from the opening 13 c side of the frame 13, and the ball bearing 19 is inserted into the fitting hole 17 a of the bracket 17. The motor 17 is configured by fastening with a screw 20 between the seat 17b of the bracket 17 and the seat 13a of the frame 13, and the gear reducer 11 and the gear cover 12 are inserted from the opening 13d side of the frame 13, and the frame 13 The gear reducer is configured by fastening with screws 21 at the seat 13b. Normally, when assembling an electric motor with a gear reducer, the frame 13 needs to be inverted when assembling the electric motor portion or the gear reducer portion because the open portion 13c or 13d of the frame 13 is assembled upward. Since the frame 13 is usually made of aluminum, the openings 13c and 13d require processing. In addition, since the opening portions 13c and 13d are on both sides, this processing is a two-step process because it is necessary to reverse the frame 13 when using a lathe or the like. For this reason, the accuracy of the concentricity of the open portions 13c and 13d is difficult to achieve. This accuracy needs to be several tens of μm or less. Further, if this accuracy is poor, the meshing between the motor shaft 15 and the gear reducer 11 becomes poor, and noise may be produced in the finished product of the gear reducer-equipped motor.
[0005]
[Problems to be solved by the invention]
In the above-described conventional configuration, a protrusion for a screw seat that fixes the bracket and the gear cover to the outer peripheral portion of the frame is required. Further, the fixed position of the gear reducer is also limited, and in the case of a gear reducer having an eccentric output shaft, the positional relationship between the lead portion of the motor and the output shaft is also limited. For this reason, when this electric motor is used in a narrow device, there is a problem in that the protruding portion interferes with the mounting. Moreover, since the positional relationship between the output shaft and the lead-out portion is limited, there is a problem that the mounting position on the device is limited. Further, since work that reverses in processing and assembly is required, workability is poor, and in particular, it is difficult to ensure processing accuracy in processing, leading to a problem of noise failure.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to provide an electric motor with a gear reducer that is inexpensive and low noise by improving the attachment property to equipment and improving workability and assembly workability.
[0007]
[Means for Solving the Problems]
In order to solve this problem, the present invention has a hole in the center of a substantially square flange portion of the open end surface, a bottom is integrated with a cylindrical casing, and a protrusion is fitted into the hole of the casing. A gear cover having a flange having the same contour as the outer shape of the flange portion of the housing; and a gear reducer in which an output shaft fixed concentrically to the projection portion of the gear cover is eccentric with respect to the flange portion , The stator, the rotor, and the bracket that holds the bearing are fixed in the hole to configure the motor unit, the gear reducer is fitted into the bracket, and the shape of the gear cover and the flange of the housing are overlapped. It is fixed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In order to solve this problem, the present invention has a hole in the center of a substantially square flange portion of the open end surface, a bottom is integrated with a cylindrical casing, and a protrusion is fitted into the hole of the casing. And a gear cover having a flange having the same contour as the outer shape of the flange portion of the housing, and a gear reducer in which an output shaft fixed concentrically to the protrusion portion of the gear cover is eccentric with respect to the flange portion , The stator, the rotor, and the bracket that holds the bearing are fixed in the hole to configure the motor unit, the gear reducer is fitted into the bracket, and the shape of the gear cover and the flange of the housing are overlapped. It is an electric motor with a gear reducer fixed by
[0009]
In addition, a fixing screw hole for fixing the gear cover to the flange portion of the housing and a mounting hole for attaching to a device or the like are provided at intervals of 90 °, and an opening hole is provided on the outer periphery of the cylindrical shape. The fixing screw hole and mounting hole that match the mounting hole are provided, and when the two flange portions are overlapped and fixed, the positions of the lead wire of the motor and the output shaft of the gear reducer are relative to each other at 90 ° intervals. The electric motor with a gear reducer according to claim 1, wherein the electric motor can be varied .
[0010]
In this way, the motor part and gear reducer part are assembled from one direction into the hole of the cylindrical casing with an integral bottom part, and the flange part is overlapped and fixed, so that assembly workability can be improved. An inexpensive and low noise motor with a gear reducer can be obtained.
In addition, even with a gear reducer with an output shaft that is eccentric with respect to the housing flange, the positions of the lead wire and the output shaft can be relatively changed at 90 ° intervals, thereby improving the ease of attachment to equipment. be able to.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1, 2, and 3, 1 is a gear reducer, 1 a is an output shaft of the gear reducer 1, 4 is a stator having a winding, 5 is an electric motor shaft, 6 is a rotor, 7 is a bracket, 8 , 9 are ball bearings that rotatably support the motor shaft 5 of the rotor 6. These configurations are almost the same as the conventional one.
[0012]
Reference numeral 2 denotes a gear cover, in which a fixing hole 2b and a mounting hole 2c are provided at 90 ° intervals in a substantially square flange portion 2a. An annular protrusion 2d that fits into the hole 3c of the housing 3 is provided, and the gear reducer 1 is later assembled so as to be concentric with the protrusion 2d.
Reference numeral 3 denotes a casing, which includes a substantially rectangular flange portion 3a, a bottom portion 3b for holding the ball bearing 8, a hole portion 3c into which the stator 4, the rotor 6 and the bracket 7 are fitted, and is fixed to the flange portion 3a. The screw holes 3d and the mounting holes 3e are provided at 90 ° intervals, respectively, and further, a hole 3f serving as an outlet of the lead line is provided on the cylindrical outer peripheral portion. Further, the flange portion 2a of the gear cover 2 and the flange portion 3a of the housing 3 have the same shape and are arranged so that holes at intervals of 90 ° overlap each other.
[0013]
Next, a method for assembling the electric motor with gear reducer will be described. First, the outer peripheral portion of the stator 4 is fixed to the hole 3c of the housing 3 by press fitting. Next, the ball bearings 8 and 9 are attached to the motor shaft 5 of the rotor 6, and the ball bearing 8 is fixed to the bottom 3 b while being fitted together with the bracket 7 in the hole 3 c of the housing 3. The lead wire connected to the winding of the stator 4 is taken out from 3f to constitute the motor part. The gear reducer 1 is concentrically fixed with respect to the protrusion 2d of the gear cover 2 to form a gear reducer portion, and is then inserted into the bracket 7 from the hole 3c side of the housing 3. Thereafter, the gear cover 2 and the flange portion of the housing 3 are overlapped and fixed to the fixing screw hole 3d from the fixing hole 2b side with the screw 12 to complete the electric motor with a gear reduction gear.
[0014]
At this time, in the case of the gear reducer 1 whose output shaft is eccentric with respect to the housing flange portion, the positional relationship with the outlet hole 3f may be determined and fixed, and the hole portion 3c of the housing 3 is directed upward. Thus, since all the components can be inserted from the hole 3c side of the housing 3, it is not necessary to invert the housing 3, and assembly can be performed from one direction, so that assembly workability is greatly improved.
[0015]
Further, the housing 3 is made of aluminum and requires machining of the inner diameter. However, since the hole 3c of the housing 3 is unidirectional in this processing, there is no need to invert the housing 3 when using a lathe or the like. Since machining can be performed with one chucking, the inner diameter machining accuracy of the housing 3 can be improved, and for example, the accuracy of the concentricity of the inner diameter of the housing 3 can be set to several tens of μm. Therefore, the meshing between the electric motor shaft 5 and the gear reducer 1 can be improved, and noise when the electric motor with the gear reducer is used can be reduced.
[0016]
As described above, the hole part is located in the center of the flange part of the open end face, and the bottom part is integrated into a cylindrical casing, so that the motor part and the speed reducer part can be incorporated into the hole part of the casing from one direction. Thus, the cylindrical portion of the housing can be structured without a protrusion for fixing.
Further, even in the gear reducer of the output shaft that is eccentric with respect to the housing flange portion, the output shaft with respect to the opening hole of the housing is formed by setting the fixing hole and the mounting hole of the substantially square flange portion at 90 ° intervals. Can be relatively changed at intervals of 90 °.
[0017]
In addition, when the gear cover and the flange portion of the housing are substantially polygonal, the fixing hole and the mounting hole may be arranged at equal intervals at an angle determined by 360 ° / number of angles, and the flange portion is circular. Even in this case, the same effect can be obtained if the fixing holes and the mounting holes are similarly shifted and arranged at equal intervals. Moreover, since the motor with a gear reducer is attached to the device in a state where the gear cover and the flange portion of the casing are overlapped, the mounting strength can be secured.
[0018]
【The invention's effect】
As is apparent from the above-described embodiments, according to the invention described in claim 1, the housing can be reduced in size and processing accuracy can be improved, and an inexpensive and low noise motor with gear reduction can be realized by improving the assembly workability. it can.
According to the second aspect of the present invention, even in a gear reducer having an output shaft that is eccentric with respect to the flange, the position of the output shaft is changed relatively at intervals of 90 ° with respect to the outlet hole. Can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electric motor with a gear reducer according to an embodiment of the present invention. FIG. 2 is a perspective view of a gear cover according to an embodiment of the present invention. 4 is a cross-sectional view of a conventional motor with a gear reducer.
DESCRIPTION OF SYMBOLS 1 Gear reducer 2 Gear cover 3 Housing | casing 4 Stator 6 Rotor 7 Bracket 2a, 3a Flange part 2b Fixing hole 2c, 3e Mounting hole 3b Bottom part 3c Hole part 3d Fixing screw hole 3f Outlet hole

Claims (2)

開放端面の略四角形のフランジ部中央に孔部を有し、底部が一体で円筒状の筐体と、前記筐体の孔部に突起部が嵌合し、前記筐体のフランジ部外形と同じ輪郭のフランジを有するギヤカバーと、前記ギヤカバーの突起部に同心に固定した出力軸がフランジ部に対して偏心した歯車減速機とを備え、前記筐体の孔部で固定子と回転子と軸受を保持するブラケットとを固定して電動機部を構成し、前記歯車減速機を前記ブラケットに嵌合させ、前記ギヤカバーと前記筐体のフランジ部形状を重ね合わせて固定した歯車減速機付電動機。A hole is formed in the center of the substantially square flange portion of the open end surface, the bottom portion is integrated with the cylindrical casing, and the protrusion is fitted into the hole portion of the casing, and is the same as the flange section outline of the casing A gear cover having a contoured flange , and a gear reducer in which an output shaft fixed concentrically to the protrusion of the gear cover is eccentric with respect to the flange, and a stator, a rotor, and a bearing are provided in the hole of the housing. An electric motor with a gear reducer in which a holding bracket is fixed to constitute an electric motor part, the gear reducer is fitted into the bracket, and the shape of the gear cover and the flange part of the housing are overlapped and fixed. 筐体のフランジ部にギヤカバーを固定する固定ネジ孔と、機器などに取り付ける取付孔をそれぞれ９０°間隔に設けるとともに、円筒状の外周に口出し孔を設け、ギヤカバーのフランジ部に前記筐体の固定ネジ孔と取付孔に合致する固定孔と取付孔を設け、前記２つのフランジ部を重ね合せて固定するとき、電動機の口出し線と歯車減速機の出力軸の位置を９０°間隔で相対的に可変できる請求項１記載の歯車減速機付電動機。A fixing screw hole for fixing the gear cover to the flange portion of the housing and a mounting hole for attaching to a device etc. are provided at intervals of 90 °, and a lead hole is provided on the outer periphery of the cylindrical shape, and the housing is fixed to the flange portion of the gear cover. When fixing holes and mounting holes that match the screw holes and mounting holes are provided, and the two flange portions are overlapped and fixed, the positions of the lead wire of the motor and the output shaft of the gear reducer are relatively spaced at 90 ° intervals. The electric motor with a gear reducer according to claim 1, which can be varied .

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