JP5124658B2 - Spherical joint - Google Patents

Spherical joint Download PDF

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JP5124658B2
JP5124658B2 JP2011006848A JP2011006848A JP5124658B2 JP 5124658 B2 JP5124658 B2 JP 5124658B2 JP 2011006848 A JP2011006848 A JP 2011006848A JP 2011006848 A JP2011006848 A JP 2011006848A JP 5124658 B2 JP5124658 B2 JP 5124658B2
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spherical
peripheral surface
shaft
support
support shaft
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JP2011080606A (en
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幸人 今村
忠 穴田
一雄 磯村
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Kawasaki Motors Ltd
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Kawasaki Jukogyo KK
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Description

本発明は球面継ぎ手に関する。さらに詳しくは、球状の内周面と球状の外周面とを接触させることにより、二部材を互いに揺動や回転を許容して接続するための球面継ぎ手に関する。   The present invention relates to a spherical joint. More specifically, the present invention relates to a spherical joint for allowing two members to be connected to each other while being allowed to swing and rotate by contacting a spherical inner peripheral surface and a spherical outer peripheral surface.

従来、球面継ぎ手は種々の技術分野で種々の装置に採用されている。たとえば、駆動シリンダを回転および揺動が可能なようにその基端部を取り付けるためにも用いられる。この使用法はたとえば特許文献１に開示されている。   Conventionally, spherical joints are used in various devices in various technical fields. For example, it is used to attach the base end of the drive cylinder so that it can rotate and swing. This method of use is disclosed in Patent Document 1, for example.

図４に示すように、この球面継ぎ手は、シリンダ５１の基部５２と、この基部５２を覆うように支持する支持部材５３とから構成されている。換言すれば、シリンダ５１の基部５２が軸部材であり、支持部材５３が球面軸受である。そのとおり基部５２の外周面は球面状に形成されている。支持部材５３の内周面である軸部材５２との摩擦面（摺動面）も球面状に形成されている。   As shown in FIG. 4, the spherical joint includes a base portion 52 of the cylinder 51 and a support member 53 that supports the base portion 52 so as to cover the base portion 52. In other words, the base 52 of the cylinder 51 is a shaft member, and the support member 53 is a spherical bearing. As shown, the outer peripheral surface of the base 52 is formed in a spherical shape. A friction surface (sliding surface) with the shaft member 52 which is an inner peripheral surface of the support member 53 is also formed in a spherical shape.

前記支持部材５３は、シリンダの基部５２に対して着脱しうるように二つに分離可能であり、固定ボルト５４によって一体化されている。支持部材５３と基部５２との摩擦面には潤滑油が供給されている。そして、支持部材５３の摩擦面の両端縁にはそれぞれ、潤滑油の漏洩を防止するため、および、塵埃等の摩擦面への侵入を防止するためにリング状のシール部材５５が設置されている。いわゆるロッドエンド等、球面部を有する軸とこの軸を揺動自在に支持する球面軸受からなる公知の球面継ぎ手は図示のような構成のものがほとんどである。   The support member 53 is separable into two so as to be detachable from the base 52 of the cylinder, and is integrated by a fixing bolt 54. Lubricating oil is supplied to the friction surface between the support member 53 and the base 52. In addition, ring-shaped seal members 55 are installed at both end edges of the friction surface of the support member 53 in order to prevent leakage of lubricating oil and to prevent entry of dust or the like into the friction surface. . Most known spherical joints comprising a shaft having a spherical surface, such as a so-called rod end, and a spherical bearing that supports the shaft in a swingable manner are configured as shown in the figure.

かかる構成の球面継ぎ手では、図中に二点鎖線で示すように軸部材５２が大きい角度揺動すると、軸部材５２の摩擦面の端縁が支持部材５３のシール部材５５より内方へ回転してしまうおそれがある。そうすると支持部材５３のシール部材５５より内方の摩擦面が大気に露出することになる。その結果、支持部材５３の摩擦面に塵埃が付着したり、シール部材が軸部材５２の摩擦面の端部によって損傷させられる可能性も生じる。
特開平９−１４２０７号公報 In the spherical joint having such a configuration, when the shaft member 52 swings by a large angle as shown by a two-dot chain line in the figure, the edge of the friction surface of the shaft member 52 rotates inward from the seal member 55 of the support member 53. There is a risk that. If it does so, the friction surface inside the seal member 55 of the support member 53 will be exposed to air | atmosphere. As a result, there is a possibility that dust adheres to the friction surface of the support member 53 or that the seal member is damaged by the end of the friction surface of the shaft member 52.
JP-A-9-14207

本発明はかかる課題を解決するためになされたものであり、軸部材が相対揺動したときに、支持部側のシール部材より内方の摩擦面が露出することが防止され、かつ、弾力的な復元力が付与される球面継ぎ手を提供することを目的としている。 The present invention has been made to solve such a problem, and when the shaft member is relatively swung, it is possible to prevent the inner friction surface from being exposed from the seal member on the support portion side and to be elastic. An object of the present invention is to provide a spherical joint to which a sufficient restoring force is applied.

本発明の球面継ぎ手は、 球面状の外周面を有する球面管部材が外嵌された軸部となる支持軸と、 前記球面管部材の外周面に接する球面状の内周面によって前記支持軸を相対揺動可能に支持する支持部を有する駆動シリンダと、 前記支持部の内周面の端部に設けられた前記球面管部材の外周面に接するシール部材と、前記駆動シリンダの前記支持部の内周面より前記支持軸の軸方向外方の部分、または、当該部分に対向する前記支持軸の部分に、前記支持軸の相対揺動を前記シール部材が前記球面管部材の球面状外周面から逸脱しない範囲に制限するストッパ部と、前記ストッパ部が、支持部に形成された軸部貫通孔の内周面から軸部に向けて内方へ突出する鍔状部から構成され、軸部の横断面外形よりわずかに大きく内周面が揺動の中心に向かって縮径するテーパ面形状を呈してなり、前記ストッパ部たる鍔状部の背面に着脱可能に保持された弾性部材と、を備え、
前記弾性部材は、その内周縁によって前記支持軸を中立位置に弾力的に保持するとともに、揺動時に中立位置に戻す復元力を付与するように前記弾性部材の内径は前記支持軸の外径とほぼ同じに形成されてなる。 The spherical joint according to the present invention includes a support shaft serving as a shaft portion on which a spherical tube member having a spherical outer peripheral surface is fitted, and a spherical inner peripheral surface in contact with the outer peripheral surface of the spherical tube member. A drive cylinder having a support portion that is supported so as to be capable of relative swinging; a seal member that is in contact with an outer peripheral surface of the spherical tube member provided at an end portion of the inner peripheral surface of the support portion; Relative oscillation of the support shaft is applied to the axially outer portion of the support shaft from the inner peripheral surface, or to the portion of the support shaft facing the portion, and the spherical outer peripheral surface of the spherical tube member The stopper portion is limited to a range that does not deviate from, and the stopper portion is configured by a hook-like portion that protrudes inward from the inner peripheral surface of the shaft portion through hole formed in the support portion toward the shaft portion. The inner peripheral surface is slightly larger than the cross-sectional outer shape of It presents a selfish diameter taper surface shape, and an elastic member which is detachably held to the back of the stopper portion serving as a flange-shaped portion,
The elastic member elastically holds the support shaft in a neutral position by its inner peripheral edge, and the inner diameter of the elastic member is equal to the outer diameter of the support shaft so as to give a restoring force to return to the neutral position when swinging. It is formed almost the same.

かかる球面継ぎ手によれば、そのストッパ部によって軸部の相対揺動を所定範囲、たとえば支持部の摩擦面が露出しない範囲に制限することができ、かつ、軸部が相対揺動したときに弾性部材によって元の位置に戻そうとする弾力的な復元力が付与される。
つまり、かかる弾性部材を装備することにより、軸部がこの弾性部材に保持された状態にすることができる。そうすれば、軸部がストッパに接触しない、いわばニュートラルな位置に弾性的に保持され、揺動するときにはこの弾性部材を押圧変形させて動くので、とくに揺動にとっての障害とはならない。また、ストッパ部による揺動範囲の制限とともにニュートラル保持という機能がコンパクトな構成に集約されるので、製造コストの低減、保守作業時間の短縮および作業手順の簡略化が可能となる。 According to such a spherical joint, the relative swing of the shaft portion can be limited to a predetermined range, for example, a range where the friction surface of the support portion is not exposed by the stopper portion, and elastic when the shaft portion relatively swings. An elastic restoring force is applied to return the member to the original position.
That is, by mounting such an elastic member, the shaft portion can be held by the elastic member. By doing so, the shaft portion is elastically held at a neutral position where it does not come into contact with the stopper, and when it swings, this elastic member is pressed and deformed, so that there is no particular obstacle to swinging. Further, since the function of holding the neutral as well as limiting the swing range by the stopper portion is integrated into a compact configuration, it is possible to reduce the manufacturing cost, shorten the maintenance work time, and simplify the work procedure.

前記弾性部材を、軸部の周囲を取り囲むように支持部に取り付けられた、環状の可撓性素材、たとえばゴムや軟質の合成樹脂等から形成することができる。   The elastic member can be formed of an annular flexible material, for example, rubber or soft synthetic resin, which is attached to the support portion so as to surround the periphery of the shaft portion.

本発明の球面継ぎ手によれば、ストッパ部を備えていることにより、その軸部と支持部とが相対的に揺動したときでも、支持部の摩擦面が露出することが防止されうるので、軸部と支持部との摩擦面へ塵埃等の侵入が効果的に防止されるとともに、軸部が相対揺動したときに弾性部材によって元の位置に戻そうとする弾力的な復元力が付与される。また、ストッパ部は球面継ぎ手自体に設置されているため、全体構造が簡素且つコンパクトなものとなる。 According to the spherical joint of the present invention, by providing the stopper portion, it is possible to prevent the friction surface of the support portion from being exposed even when the shaft portion and the support portion swing relatively. Intrusion of dust and the like into the friction surface between the shaft portion and the support portion is effectively prevented, and an elastic restoring force is applied to return the shaft portion to its original position when the shaft portion relatively swings. Is done . Further, since the stopper portion is installed on the spherical joint itself, the overall structure is simple and compact.

本発明の球面継ぎ手の一実施形態が適用された装置の一部を示す一部断面図である。It is a partial cross section figure which shows a part of apparatus with which one Embodiment of the spherical joint of this invention was applied. 図１のII−II線矢視図である。It is the II-II arrow directional view of FIG. 本発明の球面継ぎ手の他の実施形態が適用された装置を示す一部断面図である。It is a partial cross section figure which shows the apparatus with which other embodiment of the spherical joint of this invention was applied. 従来の球面継ぎ手が適用された装置の一例を示す一部断面図である。It is a partial sectional view showing an example of a device to which a conventional spherical joint is applied.

添付の図面を参照しながら本発明にかかる球面継ぎ手の実施形態を説明する。   An embodiment of a spherical joint according to the present invention will be described with reference to the accompanying drawings.

図１は本発明の球面継ぎ手の一実施形態が適用された装置の一部を示す縦断面図である。図２は図１のII−II線矢視図である。図３は本発明の球面継ぎ手の他の実施形態が適用された装置の一部を示す縦断面図である。   FIG. 1 is a longitudinal sectional view showing a part of an apparatus to which an embodiment of a spherical joint of the present invention is applied. 2 is a view taken along the line II-II in FIG. FIG. 3 is a longitudinal sectional view showing a part of an apparatus to which another embodiment of the spherical joint of the present invention is applied.

図１および図２には、駆動シリンダ１のロッドエンド構造として採用された球面継ぎ手が例示されている。この球面継ぎ手は、駆動シリンダ１の基部２と、この駆動シリンダ１をその基部２を中心として揺動可能且つ回転可能に支持する円柱状の支持軸３とから構成されている。この支持軸３が軸部材に相当し、前記基部２がこの軸部材を相対的に揺動可能且つ自軸回り回転可能に支持する支持部材に相当する。   1 and 2 illustrate a spherical joint employed as the rod end structure of the drive cylinder 1. The spherical joint includes a base portion 2 of the drive cylinder 1 and a columnar support shaft 3 that supports the drive cylinder 1 so as to be swingable and rotatable about the base portion 2. The support shaft 3 corresponds to a shaft member, and the base 2 corresponds to a support member that supports the shaft member so as to be relatively swingable and rotatable about its own axis.

この支持軸３には球面状に膨出した外周面を有する太鼓状の球面管部材５が外嵌されている。この球面管部材５は、その一端部が支持軸３に形成された段差部４に接触し、他端部が支持軸３に螺着される固定ナット６に接触することにより、支持軸３に固定されている。支持軸３の両端にはそれぞれ取付ブラケット７が設置されている。この取付ブラケット７が取付対象の基台８等にボルト９等によって固定される。球面管部材５の球面状の外周面が摩擦面となる。   A drum-shaped spherical tube member 5 having an outer peripheral surface bulging in a spherical shape is fitted on the support shaft 3. The spherical tube member 5 has one end portion in contact with the stepped portion 4 formed on the support shaft 3 and the other end portion in contact with a fixing nut 6 screwed to the support shaft 3, thereby causing the support shaft 3 to move. It is fixed. Mounting brackets 7 are installed at both ends of the support shaft 3, respectively. The mounting bracket 7 is fixed to the base 8 to be mounted by bolts 9 or the like. The spherical outer peripheral surface of the spherical tube member 5 is a friction surface.

駆動シリンダ１の基部２には、支持軸３が挿通される貫通孔１０が形成されている。この貫通孔１０の内周面には、環状の球面滑り軸受部材（以下単に軸受部材という）１１が貫通孔１０と同軸状に嵌着されている。この軸受部材１１はその内周面が凹陥した球面状を呈しており、前記球面管部材５の球面状の外周面が接する摩擦面となる。この軸受部材１１はその内周面と球面管部材５の外周面とはほぼ同一曲率の球面にされている。軸受部材１１は、その一端部が前記貫通孔１０内の段差部１２に接触し、他端部が軸受部材１１の抜け止めのための軸受固定金具１３に接触することにより、貫通孔１０内に固定されている。軸受固定金具１３は、貫通孔１０の端部に配置され、軸受部材１１の端部に接触した状態で固定ボルト１８によって基部２に固定されている。また、軸受部材１１の摩擦面の両端部にはそれぞれ、円環状のシールリング１４が球面管部材５の摩擦面に接するように設置されている。球面管部材５の摩擦面は軸受部材１１の摩擦面より、軸方向に広く形成されている。   A through hole 10 through which the support shaft 3 is inserted is formed in the base portion 2 of the drive cylinder 1. An annular spherical plain bearing member (hereinafter simply referred to as a bearing member) 11 is fitted coaxially with the through hole 10 on the inner peripheral surface of the through hole 10. The bearing member 11 has a spherical shape with a concave inner peripheral surface, and becomes a friction surface with which the spherical outer peripheral surface of the spherical tube member 5 comes into contact. The bearing member 11 has a spherical surface with substantially the same curvature on its inner peripheral surface and the outer peripheral surface of the spherical tube member 5. The bearing member 11 has one end portion in contact with the stepped portion 12 in the through-hole 10 and the other end portion in contact with the bearing fixing bracket 13 for preventing the bearing member 11 from coming off, so that the inside of the through-hole 10 is obtained. It is fixed. The bearing fixing metal 13 is disposed at the end of the through hole 10 and is fixed to the base 2 by a fixing bolt 18 in contact with the end of the bearing member 11. An annular seal ring 14 is installed at each end of the friction surface of the bearing member 11 so as to be in contact with the friction surface of the spherical tube member 5. The friction surface of the spherical tube member 5 is formed wider in the axial direction than the friction surface of the bearing member 11.

この構成により、駆動シリンダ１は支持軸３の回り（図１における紙面に垂直な方向）に回転可能であり、また、球面管部材５および軸受部材１１の摩擦面の曲率中心Ｃの回りに揺動可能である。本実施形態では、軸部材である支持軸３が基台８に固定され、軸受である駆動シリンダ１の基部２が揺動するようにされている。本発明の球面継ぎ手としては、とくにこの支持軸３と基部２との組み合わせに限定されるものではない。球面継ぎ手はその軸部材と軸受とが相対的に揺動可能にされておればよい。   With this configuration, the drive cylinder 1 can rotate around the support shaft 3 (in a direction perpendicular to the paper surface in FIG. 1), and swing around the center of curvature C of the friction surfaces of the spherical tube member 5 and the bearing member 11. It is possible to move. In this embodiment, the support shaft 3 that is a shaft member is fixed to a base 8, and the base 2 of the drive cylinder 1 that is a bearing is swung. The spherical joint of the present invention is not particularly limited to the combination of the support shaft 3 and the base 2. The spherical joint may be configured such that the shaft member and the bearing can swing relatively.

貫通孔１０の内周の一部分、すなわち、本実施形態では前記段差部１２の反軸受部材１１側に隣接した部分が、半径方向内方に鍔状に張り出している。この鍔状部分が、駆動シリンダ１の揺動を所定範囲に制限するストッパ部１５として構成されている。張り出したストッパ部１５の円形状内周縁１５Ａは貫通孔１０と同軸にされている。内周縁１５Ａの直径は前記支持軸３の直径より所定寸法だけ大きくされている。したがって、支持軸３の中心軸が軸受部材１１の中心軸と一致しているとき、すなわち、駆動シリンダ１が揺動していないとき（この状態をニュートラルの状態ともいう）、支持軸３の外周面とストッパ部内周縁１５Ａとの間に周方向に均一な隙間Ｇが形成される。この隙間Ｇと、前記曲率中心Ｃからストッパ部内周縁１５Ａまでの軸方向離間寸法とが、駆動シリンダ１の許容揺動角度を決定する。ストッパ部内周縁１５Ａが駆動シリンダ１の外周面に接触することによって駆動シリンダ１の揺動が制限されるからである。前記許容揺動角度は、駆動シリンダ１の揺動時に軸受部材１１のシールリング１４が前記球面管部材５の摩擦面から軸方向外方へ逸脱しない範囲に定められる。この範囲に基づく前記内周縁１５Ａの位置は球面継ぎ手の設計段階で容易に求めることができる。   A part of the inner periphery of the through hole 10, that is, in the present embodiment, a portion adjacent to the side opposite to the bearing member 11 of the stepped portion 12 projects in a radial shape inwardly. This hook-shaped portion is configured as a stopper portion 15 that limits the swing of the drive cylinder 1 to a predetermined range. A circular inner peripheral edge 15 </ b> A of the protruding stopper portion 15 is coaxial with the through hole 10. The diameter of the inner peripheral edge 15A is larger than the diameter of the support shaft 3 by a predetermined dimension. Therefore, when the center axis of the support shaft 3 coincides with the center axis of the bearing member 11, that is, when the drive cylinder 1 is not oscillating (this state is also referred to as a neutral state), the outer periphery of the support shaft 3 A uniform gap G is formed in the circumferential direction between the surface and the stopper inner peripheral edge 15A. The gap G and the axial separation distance from the center of curvature C to the stopper inner peripheral edge 15A determine the allowable swing angle of the drive cylinder 1. This is because the swing of the drive cylinder 1 is limited when the stopper inner peripheral edge 15 </ b> A contacts the outer peripheral surface of the drive cylinder 1. The allowable swing angle is determined in a range in which the seal ring 14 of the bearing member 11 does not deviate from the friction surface of the spherical tube member 5 in the axial direction when the drive cylinder 1 swings. The position of the inner peripheral edge 15A based on this range can be easily obtained at the design stage of the spherical joint.

ストッパ部１５は、駆動シリンダ１の揺動時に支持軸３の外周面以外には干渉しない位置および形状に形成されている。ストッパ部内周縁１５Ａは、駆動シリンダ１の揺動時に支持軸３の外周面と面接触しうるように、図示のごとく軸方向に沿って前記曲率中心Ｃに近づくにつれて縮径したテーパ状に形成されている。   The stopper portion 15 is formed in a position and a shape that do not interfere with other than the outer peripheral surface of the support shaft 3 when the drive cylinder 1 swings. The stopper inner peripheral edge 15A is formed in a taper shape whose diameter is reduced as it approaches the center of curvature C along the axial direction as shown in the figure so that it can come into surface contact with the outer peripheral surface of the support shaft 3 when the drive cylinder 1 swings. ing.

本実施形態では、前述のごとくストッパ部１５を機械加工等によって基部２に一体に形成している。しかし、かかる構成に限定されない。基部２とは別体に形成された円環状のストッパ部材を貫通孔１０内に装着しうるように構成してもよい。内径のみ異なる複数個のストッパ部材を用意しておけば、それらを取り替えることにより、駆動シリンダ１の許容揺動角度を変更することができる。   In the present embodiment, as described above, the stopper portion 15 is formed integrally with the base portion 2 by machining or the like. However, it is not limited to such a configuration. You may comprise so that the annular | circular shaped stopper member formed separately from the base 2 can be mounted in the through-hole 10. If a plurality of stopper members having different inner diameters are prepared, the allowable swing angle of the drive cylinder 1 can be changed by replacing them.

前記貫通孔１０内において、ストッパ部１５に隣接して円環状の溝１６が、貫通孔１０と同軸状に形成されている。この溝１６内には円環状の弾性部材１７が着脱可能に嵌着されている。この弾性部材１７は、たとえばゴムや軟質合成樹脂等の弾力性および可撓性を有する材料から形成されている。この弾性部材１７の内径は支持軸３の外径とほぼ同じである。そして、この弾性部材１７は、その内周縁１７Ａによって、支持軸３の中心軸が軸受部材１１の中心軸と一致するように支持軸３を弾力的に保持する寸法および位置に形成されている。この弾性部材１７の弾力は、駆動シリンダ１の揺動を阻害するほど大きいものではない。しかし、駆動シリンダ１がニュートラルの状態から揺動させられると、揺動角度にほぼ比例して駆動シリンダ１をニュートラル位置へ戻そうとする弾力的な復元力が生じる。また、弾性部材１７は、不用意にストッパ部１５が支持軸３にカチカチ当たることを防止する。   In the through hole 10, an annular groove 16 is formed coaxially with the through hole 10 adjacent to the stopper portion 15. An annular elastic member 17 is detachably fitted in the groove 16. The elastic member 17 is made of a material having elasticity and flexibility, such as rubber and soft synthetic resin. The inner diameter of the elastic member 17 is substantially the same as the outer diameter of the support shaft 3. And this elastic member 17 is formed in the dimension and position which hold | maintain the support shaft 3 elastically so that the center axis | shaft of the support shaft 3 may correspond with the center axis of the bearing member 11 by the inner periphery 17A. The elasticity of the elastic member 17 is not so great as to hinder the swing of the drive cylinder 1. However, when the drive cylinder 1 is swung from the neutral state, an elastic restoring force is generated to return the drive cylinder 1 to the neutral position substantially in proportion to the swing angle. Further, the elastic member 17 prevents the stopper portion 15 from ticking against the support shaft 3 inadvertently.

前記弾性部材としては、とくに連続した円環状に限定されることはなく、多数個の円弧状部材を円上に配置してもよい。また、ゴムや軟質合成樹脂等からなる部材に限定されない。前記貫通孔１０の内周に周方向に多数個のバネ部材を配置してもよい。各バネ部材の先端には支持軸３の外周面とほぼ同じ曲率の曲面を持つ円弧状パッドを設置しておいてもよい。   The elastic member is not particularly limited to a continuous annular shape, and a large number of arc-shaped members may be arranged on the circle. Moreover, it is not limited to the member which consists of rubber | gum, soft synthetic resin, etc. A large number of spring members may be arranged on the inner periphery of the through hole 10 in the circumferential direction. An arc-shaped pad having a curved surface with substantially the same curvature as the outer peripheral surface of the support shaft 3 may be provided at the tip of each spring member.

前述したストッパ部１５および弾性部材１７はそれぞれ、図１中の軸受部材１１の軸方向右側外方に配置されているが、この配置に限定されない。曲率中心Ｃから軸方向に離間した位置であれば軸受部材１１の軸方向いずれ側に配置されていてもよい。また、ストッパ部１５および弾性部材１７のいずれを軸方向外方に配置してもよい。しかし、着脱可能に装着されている弾性部材１７を図示のごとく外方に配置する方が着脱作業が容易となるので好ましい。   Each of the stopper portion 15 and the elastic member 17 described above is disposed on the outer right side in the axial direction of the bearing member 11 in FIG. 1, but is not limited to this arrangement. As long as the position is spaced apart from the center of curvature C in the axial direction, the bearing member 11 may be disposed on either side in the axial direction. Further, either the stopper portion 15 or the elastic member 17 may be disposed outward in the axial direction. However, it is preferable to dispose the elastic member 17 which is detachably attached as shown in the figure because the attachment / detachment work is facilitated.

また、これらストッパ部１５および弾性部材１７はともに基部２の貫通孔１０内に設けられているが、かかる構成に限定されない。前記支持軸３の外周面にストッパ部および弾性部材を形成して、基部２の貫通孔１０の内周面に接するようにしてもよい。また、ストッパ部および弾性部材のいずれか一方を支持軸３の外周面に形成し、他方を貫通孔１０の内周面に形成してもよい。   Moreover, although both the stopper part 15 and the elastic member 17 are provided in the through hole 10 of the base part 2, it is not limited to this structure. A stopper portion and an elastic member may be formed on the outer peripheral surface of the support shaft 3 so as to contact the inner peripheral surface of the through hole 10 of the base portion 2. Further, either the stopper portion or the elastic member may be formed on the outer peripheral surface of the support shaft 3, and the other may be formed on the inner peripheral surface of the through hole 10.

図３には、球面継ぎ手の他の適用例が示されている。すなわち、この球面継ぎ手は、駆動シリンダ２１の基部２２と、この基部２２を覆うように支持する支持部材２３とから構成されている。図１の球面継ぎ手とは逆に、この球面継ぎ手においてはその駆動シリンダ２１が軸部材に相当し、球面滑り軸受としての支持部材２３によって揺動可能に支持されている。基部２２の外周面は球面状に形成されており、この球面状外周面と接触する支持部材２３の内周面も球面状に形成されている。前記支持部材２３は、駆動シリンダの基部２２に着脱が容易となるように二つに分離可能に構成されており、固定ボルト２４によって一体化されている。支持部材２３の摩擦面の両端縁にはそれぞれシールリング２５が設置されている。   FIG. 3 shows another application example of the spherical joint. That is, the spherical joint is composed of a base portion 22 of the drive cylinder 21 and a support member 23 that supports the base portion 22 so as to cover it. Contrary to the spherical joint of FIG. 1, in this spherical joint, the drive cylinder 21 corresponds to a shaft member and is supported by a support member 23 as a spherical plain bearing so as to be swingable. The outer peripheral surface of the base 22 is formed in a spherical shape, and the inner peripheral surface of the support member 23 that comes into contact with the spherical outer peripheral surface is also formed in a spherical shape. The support member 23 is configured to be separable into two so as to be easily attached to and detached from the base portion 22 of the drive cylinder, and is integrated by a fixing bolt 24. Seal rings 25 are provided at both ends of the friction surface of the support member 23, respectively.

支持部材２３の駆動シリンダ側にはストッパ部材２６が固定ボルト２７によって取り付けられている。このストッパ部材２６は、その円形状の中央開口２８を円筒状の駆動シリンダ２１が貫通するように配置されている。中央開口２８の内周のうち、駆動シリンダ２１の外周面と対向する一部分が半径方向内方に鍔状に張り出している。この鍔状部分が、駆動シリンダ１の揺動を所定範囲に制限するストッパ部２９として構成されている。張り出したストッパ部２９の円形状内周縁２９Ａは支持部材２３の内周面と同軸にされている。ストッパ部内周縁２９Ａは、駆動シリンダ２１の揺動時にその外周面と面接触しうるように、図示のごとく軸方向に沿って球状摩擦面の曲率中心Ｃに近づくにつれて縮径したテーパ状に形成されている。   A stopper member 26 is attached to the drive cylinder side of the support member 23 by a fixing bolt 27. The stopper member 26 is arranged so that the cylindrical drive cylinder 21 passes through the circular central opening 28. A part of the inner periphery of the central opening 28 that faces the outer peripheral surface of the drive cylinder 21 protrudes in a bowl shape radially inward. This hook-shaped portion is configured as a stopper portion 29 that limits the swing of the drive cylinder 1 to a predetermined range. The circular inner peripheral edge 29 </ b> A of the protruding stopper portion 29 is coaxial with the inner peripheral surface of the support member 23. The stopper inner peripheral edge 29A is formed in a taper shape whose diameter is reduced as it approaches the center of curvature C of the spherical friction surface along the axial direction as shown in the figure so that it can come into surface contact with the outer peripheral surface when the drive cylinder 21 swings. ing.

内周縁２９Ａの直径は駆動シリンダ２１の直径より所定寸法だけ大きくされている。駆動シリンダ２１の中心軸と中央開口２８の中心軸が一致するニュートラルの状態においては、駆動シリンダ２１の外周面とストッパ部２９の内周縁２９Ａとの間に周方向に均一な隙間Ｇが形成される。この隙間Ｇは、駆動シリンダ２１の揺動時に支持部材２３のシールリング２５が前記基部２２の摩擦面から外方へ逸脱しない範囲に定められる。   The diameter of the inner peripheral edge 29A is larger than the diameter of the drive cylinder 21 by a predetermined dimension. In the neutral state where the central axis of the drive cylinder 21 and the central axis of the central opening 28 coincide, a uniform gap G is formed in the circumferential direction between the outer peripheral surface of the drive cylinder 21 and the inner peripheral edge 29A of the stopper portion 29. The The gap G is determined within a range in which the seal ring 25 of the support member 23 does not deviate outward from the friction surface of the base portion 22 when the drive cylinder 21 swings.

中央開口２８内における、ストッパ部２９に隣接して円環状の溝３０が、中央開口２８と同軸状に形成されている。この溝３０内には円環状の弾性部材３１が着脱可能に嵌着されている。この弾性部材３１の目的、材質および形状は前述した弾性部材１７（図１および図２）と同様にして決定されるので、その説明を省略する。   An annular groove 30 is formed coaxially with the central opening 28 adjacent to the stopper portion 29 in the central opening 28. An annular elastic member 31 is detachably fitted in the groove 30. Since the purpose, material, and shape of the elastic member 31 are determined in the same manner as the elastic member 17 (FIGS. 1 and 2) described above, description thereof is omitted.

以上説明した球面継ぎ手の実施形態では、球面滑り軸受を例示しているが、滑り軸受には限定されない。摩擦面への塵埃の侵入防止という課題はないが、たとえば、軸部材と軸受との間に多数個の遊星球を保持したリテーナを介在させた転がり球面継ぎ手にも本発明を適用することは可能である。何らかの理由によって相対揺動の角度を制限する必要があるときには有効である。   In the embodiment of the spherical joint described above, the spherical plain bearing is exemplified, but the invention is not limited to the plain bearing. Although there is no problem of preventing dust from entering the friction surface, for example, the present invention can be applied to a rolling spherical joint in which a retainer holding a large number of planetary balls is interposed between a shaft member and a bearing. It is. This is effective when it is necessary to limit the angle of relative oscillation for some reason.

本発明の球面継ぎ手は、その支持部側のシール部材より内方の摩擦面が露出するほどの大きな軸部材の揺動が防止されるので、たとえば、揺動可能ないわゆるロッドエンド等として有用である。   The spherical joint according to the present invention is useful as a so-called rod end that can be swung, for example, because the shaft member is prevented from swinging so much that the inner friction surface is exposed from the seal member on the support side. is there.

１・・・・駆動シリンダ
２・・・・基部
３・・・・支持軸
４・・・・段差部
５・・・・球面管部材
６・・・・固定ナット
７・・・・取付ブラケット
８・・・・基台
９・・・・ボルト
１０・・・・貫通孔
１１・・・・軸受部材
１２・・・・段差部
１３・・・・軸受固定金具
１４・・・・シールリング
１５・・・・ストッパ部
１６・・・・溝
１７・・・・弾性部材
１８・・・・固定ボルト
２１・・・・駆動シリンダ
２２・・・・基部
２３・・・・支持部材
２４・・・・固定ボルト
２５・・・・シールリング
２６・・・・ストッパ部材
２７・・・・固定ボルト
２８・・・・中央開口
２９・・・・ストッパ部
３０・・・・溝
３１・・・・弾性部材
Ｇ・・・・隙間 1 ... Drive cylinder
2 ... Base
3 ... Support shaft
4 .... Step part
5 .... Spherical tube member
6 ... Fixing nut
7 .... Mounting bracket
8 ... Base
9 ... Bolt
10 .... through hole
11. Bearing member
12 .... Step part
13. Bearing fixing bracket
14 .... Seal ring
15 ... Stopper part
16 .... Groove
17 .. Elastic member
18 ··· Fixing bolt
21 ... Drive cylinder
22 ··· Base
23... Support member
24 .. Fixing bolt
25... Seal ring
26... Stopper member
27 ··· Fixing bolt
28 ... Center opening
29... Stopper
30 ... Groove
31... Elastic member
G ・ ・ ・ ・ Gap

Claims (2)

球面状の外周面を有する球面管部材が外嵌された軸部となる支持軸と、
前記球面管部材の外周面に接する球面状の内周面によって前記支持軸を相対揺動可能に支持する支持部を有する駆動シリンダと、
前記支持部の内周面の端部に設けられた前記球面管部材の外周面に接するシール部材と、前記駆動シリンダの前記支持部の内周面より前記支持軸の軸方向外方の部分、または、当該部分に対向する前記支持軸の部分に、前記支持軸の相対揺動を前記シール部材が前記球面管部材の球面状外周面から逸脱しない範囲に制限するストッパ部と、
前記ストッパ部が、支持部に形成された軸部貫通孔の内周面から軸部に向けて内方へ突出する鍔状部から構成され、軸部の横断面外形よりわずかに大きく内周面が揺動の中心に向かって縮径するテーパ面形状を呈してなり、
前記ストッパ部たる鍔状部の背面に着脱可能に保持された弾性部材と、を備え、
前記弾性部材は、その内周縁によって前記支持軸を中立位置に弾力的に保持するとともに、揺動時に中立位置に戻す復元力を付与するように前記弾性部材の内径は前記支持軸の外径とほぼ同じに形成されてなる球面継ぎ手。 A support shaft serving as a shaft portion on which a spherical tube member having a spherical outer peripheral surface is fitted;
A drive cylinder having a support portion that supports the support shaft in a relatively swingable manner by a spherical inner peripheral surface that is in contact with the outer peripheral surface of the spherical tube member;
A seal member in contact with an outer peripheral surface of the spherical tube member provided at an end portion of an inner peripheral surface of the support portion, and a portion axially outward of the support shaft from an inner peripheral surface of the support portion of the drive cylinder, Alternatively, a stopper portion that restricts relative swinging of the support shaft to a portion in which the seal member does not deviate from the spherical outer peripheral surface of the spherical tube member at the portion of the support shaft facing the portion;
The stopper portion is composed of a hook-like portion that protrudes inward from the inner peripheral surface of the shaft portion through-hole formed in the support portion toward the shaft portion, and is slightly larger than the outer cross-sectional outline of the shaft portion. Has a tapered surface shape whose diameter decreases toward the center of oscillation,
An elastic member detachably held on the back surface of the bowl-shaped portion which is the stopper portion ,
The elastic member elastically holds the support shaft in a neutral position by its inner peripheral edge, and the inner diameter of the elastic member is equal to the outer diameter of the support shaft so as to give a restoring force to return to the neutral position when swinging. Spherical joints that are formed almost the same. 前記弾性部材が、軸部の周囲を取り囲むように支持部に取り付けられた、環状の可撓性素材から形成されてなる請求項１記載の球面継ぎ手。   The spherical joint according to claim 1, wherein the elastic member is formed of an annular flexible material attached to the support portion so as to surround the periphery of the shaft portion.
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