JP5909797B2

JP5909797B2 - Rotary connector

Info

Publication number: JP5909797B2
Application number: JP2012099238A
Authority: JP
Inventors: 博史沢田
Original assignee: 株式会社ヒサワ技研
Priority date: 2012-04-06
Filing date: 2012-04-06
Publication date: 2016-04-27
Anticipated expiration: 2032-04-06
Also published as: JP2013218997A

Description

本発明は、内周面が円形である外周部材と、外周部材に対して相対的に回転自在であり、外周部材の中空部に前記内周面と同軸に配設される軸体と、外周部材及び軸体間に、半径方向の弾性変形を伴い回転自在に配設されるローラ集電子とを備え、このローラ集電子を介して、外周部材及び軸体を電気的に接続するコネクタに関する。 The present invention includes an outer peripheral member having a circular inner peripheral surface, a shaft that is relatively rotatable with respect to the outer peripheral member, and that is disposed coaxially with the inner peripheral surface in a hollow portion of the outer peripheral member; The present invention relates to a connector that includes a roller current collector that is rotatably disposed with elastic deformation in the radial direction between a member and a shaft body, and electrically connects the outer peripheral member and the shaft body via the roller current collector.

相対的に回転する部材同士を電気的に接続し、これらの間で電流を送給するための構造として、ローラ集電子型のロータリーコネクタが考案されている。As a structure for electrically connecting relatively rotating members and supplying a current between them, a roller-collector type rotary connector has been devised.

ローラ集電子型ロータリーコネクタでは、外周部材と軸体が相対的に回転運動するとローラ集電子は外周部材と軸体間の円環状空間で自転しながら公転運動する、いわゆる遊星運動を行う。In the roller-collected rotary connector, when the outer peripheral member and the shaft body are relatively rotated, the roller current collector performs a so-called planetary motion that revolves while rotating in an annular space between the outer peripheral member and the shaft body.

特開２０１１−２２２４６３号公報JP 2011-222463 A

しかしながらこのローラ集電子型ロータリーコネクタは、軸体を重力方向（縦方向）に取り付けた場合、ローラ集電子は遊星運動に伴い、重力方向に徐々に落下することとなり、最終的には固定部と断続的にではあっても接触することとなり、この摺動による磨耗粉が接触抵抗の増加を招き、製品寿命を短くする。そのため、ローラ集電子がいずれの部材とも摺動することがなく、その軸方向の移動を制限する構造が望まれる。However, in this roller collector type rotary connector, when the shaft body is attached in the direction of gravity (longitudinal direction), the roller collector is gradually dropped in the direction of gravity along with the planetary motion, and finally the fixed portion and Even if intermittent, they come into contact with each other, and the abrasion powder caused by this sliding increases contact resistance and shortens the product life. Therefore, a structure is desired in which the roller current collector does not slide with any member and the movement in the axial direction is limited.

溝底面に対しその外側に傾斜した側壁を持つ溝にローラ集電子を収容することで、ローラ集電子が自立的にその軸方向位置を調整し、いずれの部材とも摺動することのない構造を達成する。この際、側壁の傾斜角度、つまり溝底面と側壁のなす傾斜角度は０度を越え９０度未満とし、この溝を軸体、外周部材のいずれか一方または両方に設けることとする。 By storing the roller current collector in a groove having a side wall that is inclined to the outer side with respect to the groove bottom surface, the roller current collector can independently adjust its axial position so that it does not slide with any member. Achieve. At this time, the inclination angle of the side wall, that is, the inclination angle formed between the groove bottom surface and the side wall is more than 0 degree and less than 90 degrees, and this groove is provided in one or both of the shaft body and the outer peripheral member.

このように傾斜した側壁により、ローラ集電子が配設されている空間は、側壁の傾斜の始まる位置から徐々に狭くなっている。このためローラ集電子に重力などで軸方向への力が働いた際でも、ローラ集電子がこの狭くなった空間に侵入するには、ローラ集電子の受ける重力が、弾性変形の増加分により新たに発生したローラ集電子のバネ力が側壁の傾斜により重力と対抗する向きに作用する力を上回る必要がある。通常ローラ集電子が受ける重力は、ローラ集電子の弾性変形により発生する力と比べて十分小さいため、ローラ集電子は側壁の手前で自立的にその位置に留まることになる。 Due to the inclined side wall, the space in which the roller current collector is disposed is gradually narrowed from the position where the side wall starts to be inclined. For this reason, even when a force in the axial direction is applied to the roller current collector due to gravity or the like, in order for the roller current collector to enter this narrow space, the gravity received by the roller current collector is renewed due to the increase in elastic deformation. It is necessary for the spring force of the roller current collector generated in the above to exceed the force acting in the direction opposite to gravity due to the inclination of the side wall. Normally, the gravitational force received by the roller current collector is sufficiently smaller than the force generated by the elastic deformation of the roller current collector, so that the roller current collector stays in that position in front of the side wall.

また側壁の傾斜角は９０度未満であることから、ローラ集電子端面と側壁は接触することがなく、摺動部のない構造が達成できる。 Further, since the inclination angle of the side wall is less than 90 degrees, the roller current collecting end face and the side wall are not in contact with each other, and a structure having no sliding portion can be achieved.

この構造によればロータリーコネクタは垂直、水平など取り付け方向が任意となり、部品点数を増やすことなく構造が簡単で、組み立て作業の容易なロータリーコネクタを実現できる。 According to this structure, the rotary connector can be attached in any direction, such as vertical and horizontal, and the structure is simple without increasing the number of parts, and a rotary connector that can be easily assembled can be realized.

本発明によるロータリーコネクタの回転軸方向の断面図であり、回転軸にのみ溝加工を行った例を示す断面図It is sectional drawing of the rotating shaft direction of the rotary connector by this invention, and sectional drawing which shows the example which grooved only the rotating shaft 図１に記載の線に沿った断面を矢印Ａ−Ａ方向から見た断面図Sectional drawing which looked at the cross section along the line of FIG. 1 from the arrow AA direction 傾斜した側壁を持つ溝を回転軸に施した場合の図であり、溝寸法や位置を表す構成図It is a figure when a groove with an inclined side wall is given to the rotating shaft, and a configuration diagram showing the groove dimensions and position

図を参考に実施形態を説明する。図１は軸体１にのみ、傾斜した側壁４を持つ溝加工を行った例である。図３の溝幅ｗは通常の使用範囲ではローラ集電子３の幅（軸方向の長さ）より十分広く設定してよいが、高速回転で使用される場合はローラ集電子３の幅よりわずかに広い程度に設定する必要がある。 Embodiments will be described with reference to the drawings. FIG. 1 shows an example in which only a shaft body 1 is subjected to groove processing having an inclined side wall 4. The groove width w in FIG. 3 may be set sufficiently wider than the width of the roller current collector 3 (length in the axial direction) in the normal use range, but slightly smaller than the width of the roller current collector 3 when used at high speed rotation. It is necessary to set a wide range.

ローラ集電子は遊星運動に際し、回転軸に対して傾斜する傾向があり、特にローラ集電子の幅が広いほど、また軸体の回転速度が速いほどその現象は顕著である。ローラ集電子の幅が５ｍｍ程度の場合、回転速度が２０，０００ｒｐｍ．程度であってもこの傾斜現象は発現しないが、幅が１０ｍｍ程度の場合、前記回転速度ではこの傾斜現象による異常磨耗が確認されている。このように、ロータリーコネクタが高速回転で用いられ、ローラ集電子の幅が広いときには、溝の幅をローラ集電子３より僅かに広くすることが好ましい。 The roller current collector tends to be inclined with respect to the rotation axis during planetary motion, and the phenomenon becomes more remarkable as the width of the roller current collector is wider and the rotation speed of the shaft body is higher. When the width of the roller current collector is about 5 mm, the rotational speed is 20,000 rpm. However, even if the width is about 10 mm, abnormal wear due to the tilt phenomenon is confirmed at the rotational speed. Thus, when the rotary connector is used at high speed and the width of the roller current collector is wide, it is preferable that the width of the groove is slightly wider than that of the roller current collector 3.

またローラ集電子３の幅は広いほど接触抵抗が下がるため、大電流通電用途では幅を広くするが、ローラ集電子３の幅が２５ｍｍ程度の場合は低速回転であっても傾斜現象が発現する場合があり、溝幅ｗに対しローラ集電子３の幅がわずかに狭いこととし、同時に軸体１と外周部材２の両方に溝加工を行うことでローラ集電子３の傾斜現象の発現を確実に回避する構造とする。即ち、図１あるいは図３には表されていないが、軸体１に設けたと同様の側壁付きの溝を外周部材２の内周面に形成する。このように、ローラ集電子３の幅が大きいときには傾斜側壁４を有する溝を、外周部材１と軸体２の双方に設けると好適である。 In addition, since the contact resistance decreases as the width of the roller current collector 3 increases, the width of the roller current collector 3 is increased for high current application. However, when the width of the roller current collector 3 is approximately 25 mm, a tilt phenomenon occurs even at low speed rotation. In some cases, the width of the roller current collector 3 is slightly narrower than the groove width w, and at the same time, by performing groove processing on both the shaft body 1 and the outer peripheral member 2, the occurrence of the tilt phenomenon of the roller current collector 3 is ensured. The structure is to avoid. That is, although not shown in FIG. 1 or FIG. 3, a groove with a side wall similar to that provided in the shaft body 1 is formed on the inner peripheral surface of the outer peripheral member 2. As described above, when the width of the roller current collector 3 is large, it is preferable to provide a groove having the inclined side wall 4 in both the outer peripheral member 1 and the shaft body 2.

次に、図３の溝深さｄに関して述べる。ロータリーコネクタ組み立ての際、ローラ集電子３はこのｄ分だけ通常より余計に弾性変形させる必要があることに注意する。このためローラ集電子３の弾性限界を超えて変形させないようにｄ寸法を設定しなければならない。
許容される弾性変形量は集電子材質、集電子肉厚、集電子直径により変化するが例えばローラ集電子材質にベリリウム銅、集電子肉厚０．１３ｍｍ、集電子直径φ７ｍｍとした場合、直径方向の変形量０．５ｍｍ以内であれば問題ない。Next, the groove depth d in FIG. 3 will be described. When assembling the rotary connector, it should be noted that the roller current collector 3 needs to be elastically deformed more than usual by this d. For this reason, the dimension d must be set so as not to be deformed beyond the elastic limit of the roller current collector 3.
The allowable amount of elastic deformation varies depending on the current collector material, current collector thickness, and current collector diameter. For example, when the roller current collector material is beryllium copper, the current collector thickness is 0.13 mm, and the current collector diameter is 7 mm, the diameter direction If the amount of deformation is within 0.5 mm, there is no problem.

また、溝底面と側壁４のなす傾斜角度θはローラ集電子３の自重と弾性変形時のバネ力により設定される。通常、ローラ集電子３が受ける重力は弾性変形時のバネ力に比べて十分小さいため３０度程度の傾斜があれば問題いない。この傾斜角度はローラ集電子３の弾性変形によるバネ力を重力方向と対抗する向きに方向を変換する役目を持っており、傾斜角度が小さ過ぎるとその作用が十分ではないこともあるが、その場合は傾斜角度を増やすことで調整すればよい。 The inclination angle θ formed by the groove bottom surface and the side wall 4 is set by the weight of the roller current collector 3 and the spring force during elastic deformation. Normally, the gravity received by the roller current collector 3 is sufficiently smaller than the spring force at the time of elastic deformation, so there is no problem if there is an inclination of about 30 degrees. This inclination angle has the role of changing the direction of the spring force generated by the elastic deformation of the roller current collector 3 in a direction opposite to the direction of gravity. If the inclination angle is too small, the action may not be sufficient. In this case, the adjustment may be made by increasing the tilt angle.

しかし、一般的には加工コストの面から設定すればよく、例えば旋盤での加工を想定すればバイトの刃先角度に合わせて３０度から６０度程度の範囲で自由に設定すればよい。また角度に関して９０度末満とするのはローラ集電子３の端面が、側壁４と摺動するのを防ぐためである。ローラ集電子３の軸方向の移動を制限するのはあくまで空間の狭まりによるローラ集電子３の自立的な位置調整作用であることに注意する。 However, in general, it may be set from the viewpoint of machining cost. For example, assuming machining on a lathe, it may be set freely within a range of about 30 to 60 degrees according to the cutting edge angle of the cutting tool. The reason why the angle is 90 degrees is to prevent the end face of the roller current collector 3 from sliding with the side wall 4. It should be noted that limiting the movement of the roller current collector 3 in the axial direction is an independent position adjusting action of the roller current collector 3 due to the narrowing of the space.

さらに、この溝加工は通常の用途では軸体１または外周部材２のどちらか一方に施せばよいが、一般的には軸体１に施す方が、外周部に対する加工となるため、加工コストの面で有利であると言える。ただし、高速回転、振動環境などで使用される場合、ローラ集電子３の軸方向の動き、また軸に対して傾斜する動きを確実に規制するため、軸体１及び外周部材２の両方に溝加工を施すことが望ましい。 Furthermore, this groove processing may be performed on either the shaft body 1 or the outer peripheral member 2 in a normal application, but generally, the processing on the outer peripheral portion is performed on the shaft body 1, so that the processing cost is reduced. It can be said that this is advantageous. However, when used in a high-speed rotation, vibration environment, or the like, a groove is formed in both the shaft body 1 and the outer peripheral member 2 in order to reliably restrict the movement of the roller current collector 3 in the axial direction and the movement inclined with respect to the shaft. It is desirable to apply processing.

１軸体
２外周部材
３ローラ集電子
４傾斜1 Shaft body 2 Outer peripheral member 3 Roller current collector 4 Inclination

Claims

内周面が円形である外周部材と、前記外周部材に対して相対的に回転自在であり、前記外周部材の中空部に前記内周面と同軸に配設される軸体と、前記外周部材及び前記軸体間で半径方向に弾性変形しながら遊星運動するよう回転自在に配設されるローラ集電子とを備え、前記ローラ集電子を介して、前記外周部材及び前記軸体を電気的に接続するロータリーコネクタにおいて、前記軸体、前記外周部材のいずれか一方または両方に、ローラ集電子の軸方向長さよりも長くその両端部に連なって、前記軸体の場合は外側、前記外周部材の場合は内側に傾斜する側壁がある溝を備え、その溝に前記ローラ集電子を配設することを特徴とするロータリーコネクタ。An outer peripheral member having a circular inner peripheral surface, a shaft that is relatively rotatable with respect to the outer peripheral member, and is disposed coaxially with the inner peripheral surface in a hollow portion of the outer peripheral member, and the outer peripheral member And a roller current collector rotatably arranged so as to make a planetary movement while elastically deforming in the radial direction between the shaft bodies, and electrically connecting the outer peripheral member and the shaft body via the roller current collectors. In the rotary connector to be connected, either one or both of the shaft body and the outer peripheral member is connected to both ends of the shaft longer than the axial length of the roller current collector . comprises a groove in the side walls that slope inwardly case, a rotary connector, wherein the arrangement to Rukoto the roller collecting electrons in the groove.

前記溝の溝底面部と側壁とのなす傾斜角度が、０度を越え９０度未満であることを特徴とする請求項１のロータリーコネクタ。2. The rotary connector according to claim 1, wherein an inclination angle formed by the groove bottom surface portion and the side wall of the groove is more than 0 degree and less than 90 degrees.