JP2019100415A - Anti-cementation agent infiltration prevention bearing structure, four-point contact ball bearing including the same and ball screw device - Google Patents

Anti-cementation agent infiltration prevention bearing structure, four-point contact ball bearing including the same and ball screw device Download PDF

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JP2019100415A
JP2019100415A JP2017230581A JP2017230581A JP2019100415A JP 2019100415 A JP2019100415 A JP 2019100415A JP 2017230581 A JP2017230581 A JP 2017230581A JP 2017230581 A JP2017230581 A JP 2017230581A JP 2019100415 A JP2019100415 A JP 2019100415A
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outer ring
agent
point contact
bearing
contact ball
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JP7119358B2 (en
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宏教 水城
Hironori Mizushiro
宏教 水城
下村　祐二
Yuji Shimomura
祐二 下村
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/2015—Means specially adapted for stopping actuators in the end position; Position sensing means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

To constraint or inhibit an anti-cementation agent from moving, such as dripping, to a raceway surface and prevent the anti-cementation agent from infiltrating into the raceway surface.SOLUTION: An anti-cementation agent infiltration prevention bearing structure is provided with an anti-cementation agent trap part 41t for preventing or inhibiting an anti-cementation agent that has been applied or infiltrated from moving to a raceway surface 41k, in a position on a side of an inner peripheral surface between an end surface of an outer ring 41 formed with an anti-cementation treatment part 41y and the raceway surface 41k of the outer ring 41.SELECTED DRAWING: Figure 1

Description

本発明は、防炭剤の浸入防止軸受構造およびこれを備える４点接触玉軸受並びにボールねじ装置に関する。   BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an anti-carburetor bearing structure, a four-point contact ball bearing having the same, and a ball screw device.

例えばボールねじ装置に軸受を使用する場合に、軸受の外輪に対して後工程で追加工を施したり、軸受の外輪に切欠き形状の加工を施すことで薄肉部が形成されたりすることがある。例えば、浸炭処理後に、軸受の外輪端面に切欠き形状を追加工する際、追加工を施す部分での外輪の炭素量を下げたいため、外輪に追加工を施す部分とその近傍のみに防炭処理が施される（例えば特許文献１（段落００１５〜００１６）参照）。   For example, in the case of using a bearing for a ball screw device, a thin portion may be formed by applying additional processing to the outer ring of the bearing in a later step or processing the notch outer ring on the outer ring of the bearing . For example, after carburizing, when adding a notch shape to the end face of the outer ring of the bearing, it is desirable to reduce the carbon content of the outer ring at the portion to be subjected to additional processing. Processing is performed (see, for example, Patent Literature 1 (paragraphs 0015 to 0016)).

特開２０１１−１７４０９号公報JP, 2011-17409, A

しかし、防炭処理にあっては、流動性を有する防炭剤を塗布または浸漬する。そのため、防炭剤が軸受外輪端面から外輪の軌道面側に垂れ落ちて軌道面に浸入すると軌道面が焼き入れ不良となる。よって、外輪の軌道面への防炭剤の垂れ落ち等による侵入を防ぐ必要がある。
そこで、本発明は、このような問題点に着目してなされたものであり、軸受の外輪端面に流動性を有する防炭剤の塗布または浸漬による防炭処理部が形成される軸受において、外輪の軌道面への防炭剤の垂れ落ち等による侵入を防止または抑制し得る防炭剤の浸入防止軸受構造およびこれを備える４点接触玉軸受並びにボールねじ装置を提供することを課題とする。 However, in the case of anti-carburizing treatment, a fluid anti-carburizing agent is applied or immersed. For this reason, if the anti-carburizing agent drips down from the bearing outer ring end face to the raceway surface side of the outer ring and penetrates into the raceway surface, the raceway surface becomes quenched. Therefore, it is necessary to prevent the intrusion of the anti-carbon agent to the raceway surface of the outer ring and the like.
Therefore, the present invention has been made by paying attention to such problems, and in the bearing in which an anti-carburized portion is formed by coating or immersing a fluid-proof anti-carburizing agent on the end face of the outer ring of the bearing, It is an object of the present invention to provide an anti-carburetor intrusion preventing bearing structure capable of preventing or suppressing intrusion of the carburizer onto the raceway surface of the bearing, and a four-point contact ball bearing and a ball screw device provided therewith.

上記課題を解決するために、本発明の一態様に係る防炭剤の浸入防止軸受構造は、軸受の外輪端面に流動性を有する防炭剤の塗布または浸漬による防炭処理部が形成される軸受素材用の防炭剤の浸入防止軸受構造であって、前記防炭処理部が形成される外輪の端面と前記外輪の軌道面との間の外輪内周側の位置に、前記塗布または浸漬後の防炭剤の前記外輪の軌道面への移動を防止または抑制する防炭剤トラップ部が形成されていることを特徴とする。
また、上記課題を解決するために、本発明の一態様に係る４点接触玉軸受は、ナットに伝達された回転運動をねじ軸の直線運動として変換するボールねじ装置に用いられ、前記回転運動を行う前記ナットを支持するための４点接触玉軸受であって、軌道面を構成するゴシックアーチ溝をそれぞれ有する内輪および外輪と、これら内輪および外輪の軌道面間に転動自在に介装される複数のボールと、これら複数のボールを保持するクラウン型保持器と、を有し、前記外輪は、本発明の一態様に係る防炭剤の浸入防止軸受構造を有することを特徴とする。 In order to solve the above-mentioned subject, in the penetration preventing bearing structure of the anti-carburizing agent according to one aspect of the present invention, an anti-carburized portion is formed by applying or immersing the anti-carburizing agent having fluidity to the end face of outer ring A bearing structure for preventing entry of a carburizing agent for a bearing material, wherein the application or immersion is performed at a position on the inner peripheral side of the outer ring between the end face of the outer ring on which the carbon treated portion is formed and the raceway surface of the outer ring. It is characterized in that a decarburizing agent trap portion is formed to prevent or suppress the later movement of the decarburizing agent to the raceway surface of the outer ring.
Further, in order to solve the above problems, the four-point contact ball bearing according to one aspect of the present invention is used in a ball screw device that converts rotational motion transmitted to a nut as linear motion of a screw shaft. 4-point contact ball bearing for supporting the nut, which is mounted on the inner ring and the outer ring respectively having the gothic arch groove constituting the raceway surface, and rollably interposed between the raceway surfaces of the inner ring and the outer ring A plurality of balls and a crown type cage for holding the plurality of balls, and the outer ring is characterized by having an anti-carburetor entry preventing bearing structure according to one aspect of the present invention.

さらに、本発明の一態様に係るボールねじ装置は、外周面に螺旋状の転動路を設けたねじ軸と、内周面に前記ねじ軸の転動路に対応する螺旋状の転動路を設けたナットと、前記ねじ軸及び前記ナット相互の転動路間に転動自在に介装される複数の転動体と、前記ナットに回転運動を伝達するトルク伝達部材と、回転運動を行う前記ナットを支持する４点接触玉軸受と、を備え、前記ナットに伝達された回転運動を前記ねじ軸の直線運動として変換するボールねじ装置であって、前記４点接触玉軸受として、本発明の一態様に係る４点接触玉軸受を備えることを特徴とする。   Furthermore, in the ball screw device according to one aspect of the present invention, a screw shaft provided with a spiral rolling path on the outer peripheral surface, and a spiral rolling path corresponding to the rolling shaft of the screw shaft on the inner peripheral surface , A plurality of rolling elements rollably interposed between the screw shaft and the rolling path between the nuts, and a torque transfer member for transmitting the rotational motion to the nut A ball screw device comprising: a four-point contact ball bearing for supporting the nut; and converting the rotational motion transmitted to the nut as a linear motion of the screw shaft, the four-point contact ball bearing according to the present invention And a four-point contact ball bearing according to one aspect of the present invention.

本発明によれば、軸受の外輪端面に流動性を有する防炭剤の塗布または浸漬による防炭処理部が形成される軸受素材に対し、防炭処理部が形成される外輪の端面と外輪の軌道面との間の外輪内周側の位置に、防炭剤トラップ部を設けたので、これにより、外輪の軌道面への防炭剤の垂れ落ち等による移動を拘束または抑制して軌道面への防炭剤の浸入を防止または抑制できる。   According to the present invention, the end face of the outer ring and the outer ring in which the anti-carburized portion is formed with respect to the bearing material in which the anti-carburized portion is formed by applying or immersing the anti-carbon agent having fluidity on the outer ring end face of the bearing Since the anti-carburizing agent trap portion is provided at a position on the inner peripheral side of the outer ring between it and the raceway surface, the movement of the anti-carburizing agent to the raceway surface of the outer ring is restrained or suppressed to restrain the raceway surface. It is possible to prevent or suppress the infiltration of the anti-carburizing agent into the air.

本発明の一態様に係る防炭剤の浸入防止軸受構造を有する軸受を備えるボールねじ装置の第一実施形態を示す模式的説明図であり、同図では軸方向に沿った断面を示している。BRIEF DESCRIPTION OF THE DRAWINGS It is typical explanatory drawing which shows 1st embodiment of a ball screw apparatus provided with the bearing which has the intrusion prevention bearing structure of the anticarbide which concerns on 1 aspect of this invention, and shows the cross section which followed the axial direction in the figure. . 本発明の一態様に係る防炭剤の浸入防止軸受構造を有する軸受を備えるボールねじ装置の第二実施形態を示す模式的説明図であり、同図では軸方向に沿った断面を示している。It is a schematic explanatory drawing which shows 2nd embodiment of a ball screw apparatus provided with the bearing which has the intrusion prevention bearing structure of the anticarbide which concerns on 1 aspect of this invention, and shows the cross section which followed the axial direction in the figure. . 防炭剤トラップ部のトラップ形状の変形例を説明する要部拡大図（（ａ）〜（ｃ））であり、同図では固定プレートを装着する凹部の追加工前の状態を示している。It is a principal part enlarged view ((a)-(c)) explaining the modification of the trap shape of a carbon-carbon agent trap part, and the same figure shows the state before additional processing of the crevice which mounts a fixed plate.

以下、本発明の一実施形態について、図面を適宜参照しつつ説明する。なお、図面は模式的なものである。そのため、厚みと平面寸法との関係、比率等は現実のものとは異なることに留意すべきであり、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。また、以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記の実施形態に特定するものではない。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the plane dimension, the ratio, etc. is different from the actual one, and some parts have different dimensional relationships and ratios among the drawings. In addition, the embodiments described below illustrate apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention includes materials, shapes, structures, and arrangements of component parts. Etc. are not specified in the following embodiment.

［第一実施形態］
図１に示すように、第一実施形態のボールねじ装置１０は、ねじ軸２０およびナット３０を備える。ねじ軸２０の外周面には螺旋状の転動路であるねじ溝２１が設けられ、ナット３０の内周には、ねじ溝２１に対向する螺旋状の転動路であるねじ溝３１が設けられている。
図示を省略するが、ねじ軸２０およびナット３０相互のねじ溝２１、３１の間には、転動体である複数のボール（図示せず）が転動自在に介装され、これら複数のボールは、転動路の端を繋ぐボール循環路を介して循環可能に構成されている。ナット３０の軸方向の略中央部には、キー溝にキー３３が装着され、その外周の位置に、歯車等のトルク伝達部材７１が取り付けられている。トルク伝達部材７１は、外部からの回転入力Ｒにより、ねじ軸２０を中心として回転するようになっている。
ナット３０は、トルク伝達部材７１の同図右側の位置で、ハウジング８０に対して４点接触玉軸受４０を介して回転自在に支持されている。本実施形態の４点接触玉軸受４０は、その外輪４１の端面が、ハウジング８０の端面に対して面一に固定部９０によって固定される。 First Embodiment
As shown in FIG. 1, the ball screw device 10 according to the first embodiment includes a screw shaft 20 and a nut 30. The screw groove 21 which is a spiral rolling path is provided on the outer peripheral surface of the screw shaft 20, and the screw groove 31 which is a spiral rolling path facing the screw groove 21 is provided on the inner periphery of the nut 30. It is done.
Although not shown, a plurality of balls (not shown), which are rolling elements, are rotatably interposed between the screw grooves 21 and 31 of the screw shaft 20 and the nut 30, and the plurality of balls are And a ball circulation passage connecting the ends of the rolling passages. A key 33 is attached to the key groove substantially at the center of the nut 30 in the axial direction, and a torque transmission member 71 such as a gear is attached at the position of the outer periphery thereof. The torque transfer member 71 is configured to rotate around the screw shaft 20 by a rotation input R from the outside.
The nut 30 is rotatably supported on the housing 80 via a four-point contact ball bearing 40 at a position on the right side of the torque transfer member 71 in the drawing. The end face of the outer ring 41 of the four-point contact ball bearing 40 of the present embodiment is fixed by the fixing portion 90 flush with the end face of the housing 80.

本実施形態の固定部９０は、円環状に形成された板部材である固定プレート９１と、固定プレート９１の周方向に離隔して複数形成された装着穴に装着される固定ねじ９２とを有する。外輪４１の端面には、その外周側に円環状の凹部４１ｊが、固定プレート９１の内周が嵌め込まれるとともに周方向の移動を拘束する係合が可能に追加工によって形成される。
また、ハウジング８０の端面には、その内周側に円環状の凹部８０ｊが固定プレート９１の外周側を嵌め込み可能に形成されるとともに、固定プレート９１の複数の装着穴に対向する位置それぞれに、雌ねじが形成される。これにより、固定プレート９１を凹部４１ｊ、８０ｊに嵌め込むとともに固定ねじ９２を締めこむことにより、外輪４１がハウジング８０に固定されるようになっている。これにより、本実施形態では、軸方向に固定されているナット３０が外部からの回転入力Ｒに応じて回転することにより、ねじ軸２０が軸方向に直線駆動されるようになっている。 The fixing portion 90 of the present embodiment has a fixing plate 91 which is a plate member formed in an annular shape, and a fixing screw 92 which is mounted in a plurality of mounting holes which are formed separately in the circumferential direction of the fixing plate 91. . On the end face of the outer ring 41, an annular recess 41j is formed on the outer peripheral side by an additional process that allows the inner periphery of the fixed plate 91 to be fitted and the engagement for restraining movement in the circumferential direction.
Further, on the end face of the housing 80, an annular recess 80j is formed on the inner peripheral side so that the outer peripheral side of the fixed plate 91 can be inserted and at positions facing the plurality of mounting holes of the fixed plate 91, An internal thread is formed. Thus, the outer ring 41 is fixed to the housing 80 by inserting the fixing plate 91 into the recesses 41 j and 80 j and tightening the fixing screw 92. Thus, in the present embodiment, the screw shaft 20 is linearly driven in the axial direction by rotating the nut 30 fixed in the axial direction according to the rotation input R from the outside.

本実施形態のボールねじ装置１０は、ナット３０の端面には、規制手段を構成する二つの係止部６１、６２が周方向に１８０°離隔した位置に設けられている。また、ねじ軸２０には、規制手段を構成するストッパ５０がスプライン嵌合により装着されている。ストッパ５０には、二つのストッパ部５１、５２が周方向に１８０°離隔した位置に設けられている。
これにより、本実施形態のボールねじ装置１０は、トルク伝達部材７１への外部からの回転入力Ｒにより、トルク伝達部材７１とともにナット３０が所定量の回転をすると、ねじ軸２０が所定の直線運動の行程を超えた場合に、ナット３０の係止部６１、６２がねじ軸２０のストッパ部５１、５２に同時に当接し、ボールねじ装置１０自身およびボールねじ装置１０に駆動される装置の破損を防止するために、ねじ軸２０の直線運動行程を強制的に制限可能になっている。 In the ball screw device 10 of the present embodiment, on the end face of the nut 30, two locking portions 61, 62 constituting the regulating means are provided at positions separated by 180 degrees in the circumferential direction. Moreover, the stopper 50 which comprises a control means is attached to the screw shaft 20 by spline fitting. In the stopper 50, two stopper portions 51 and 52 are provided at positions separated by 180 degrees in the circumferential direction.
Thereby, in the ball screw device 10 of the present embodiment, when the nut 30 is rotated by a predetermined amount together with the torque transmission member 71 by the rotation input R from the outside to the torque transmission member 71, the screw shaft 20 performs a predetermined linear motion. Of the screw 30 simultaneously with the stoppers 51 and 52 of the screw shaft 20, and damage to the ball screw device 10 itself and the device driven by the ball screw device 10 In order to prevent this, the linear movement stroke of the screw shaft 20 can be forcibly limited.

次に、上記４点接触玉軸受４０およびその外輪４１に設けられた防炭剤トラップ部４１ｔ（図１の符号Ｘで示す部分）について説明する。
第一実施形態の４点接触玉軸受４０は、円環状の外輪４１と、ナット３０の外周面に一体形成されて内輪として機能する内輪部（ナット３０の外周面に内輪軌道面４２ｋが形成されている部分（以下同じ））と、転動体である複数のボール（玉）４３とを有する。ボール４３は、クラウン型保持器４４で円周方向に等間隔に且つ転動自在に保持されている。この４点接触玉軸受４０には、ボールねじ装置１０の組立時にグリース等の潤滑油が封入され、４点接触玉軸受４０の外輪４１と内輪部との間で形成される開口部は不図示のシール又はシールドで塞がれる。 Next, the above-described four-point contact ball bearing 40 and the anti-carburizing agent trap portion 41t (the portion indicated by the symbol X in FIG. 1) provided in the outer ring 41 thereof will be described.
In the four-point contact ball bearing 40 of the first embodiment, an inner ring portion (an inner ring raceway surface 42k is formed on the outer peripheral surface of the nut 30) integrally formed on the outer ring 41 and the outer peripheral surface of the nut 30 to function as an inner ring. And a plurality of balls (balls) 43 which are rolling elements. The balls 43 are rotatably held at even intervals in the circumferential direction by the crown type cage 44. A lubricating oil such as grease is enclosed in the four-point contact ball bearing 40 when the ball screw device 10 is assembled, and an opening formed between the outer ring 41 and the inner ring portion of the four-point contact ball bearing 40 is not shown. Closed with a seal or shield.

より詳しくは、この４点接触玉軸受４０は、内輪軌道面４２ｋ及び外輪軌道面４１ｋの断面形状が、ゴシックアーチ形状（中心の異なる２つの同一円弧を組合せた略Ｖ字状）である。そして、内輪軌道面４２ｋ相互の境界部分には凹部からなるボール転動溝底（ゴシックアーチ溝底）４２ｄが形成され、外輪軌道面４１ｋ相互の境界部分には凹部からなるボール転動溝底（ゴシックアーチ溝底）４１ｄが形成されており、これらボール転動溝底４１ｄ、４２ｄ内に潤滑剤としてグリースが保持される。そのため、これら軌道面４１ｋ、４２ｋとボール（玉）４３との間にグリースが常に存在することとなって、ボール転動溝底４１ｄ、４２ｄ内のグリースは、内外の軌道面４１ｋ、４２ｋとボール４３の周囲に供給され、４点接触玉軸受４０の良好な潤滑が長期間にわたって維持されるようになっている。   More specifically, in the four-point contact ball bearing 40, the cross-sectional shapes of the inner ring raceway surface 42k and the outer ring raceway surface 41k are gothic arch shapes (substantially V-shaped in which two identical circular arcs having different centers are combined). A ball rolling groove bottom (Gothic arch groove bottom) 42d consisting of a recess is formed at the boundary between the inner ring raceways 42k, and a ball rolling groove bottom consisting of a recess is formed at the boundary between the outer raceway 41k. Gothic arch groove bottoms) 41d are formed, and grease is held in these ball rolling groove bottoms 41d and 42d as a lubricant. Therefore, grease is always present between the raceway surfaces 41k and 42k and the balls 43, and the grease in the ball rolling groove bottoms 41d and 42d is the inner and outer raceway surfaces 41k and 42k and the ball. 43 are supplied so that good lubrication of the four-point contact ball bearing 40 is maintained over a long period of time.

第一実施形態の４点接触玉軸受４０は、上述したように、内輪を構成する部分がナット３０と一体形成されている。また、第一実施形態の外輪４１は、軸方向前後においてボール転動溝底４１ｄの位置で分割体４１ａ，４１ｂの二つに分離されている。さらに、第一実施形態の４点接触玉軸受４０は、外輪４１の一端面（同図左側の端面）側からハウジング８０の端面に固定部９０によって軸方向に固定ねじ９２を締めこむことにより固定される。
これにより、この４点接触玉軸受４０は、正確な位置決めと予圧付与が可能であって、アキシャル荷重とラジアル荷重とモーメント荷重を同時に受けることができるとともに軸受幅を小さくできる。そのため、例えば二列組合せアンギュラ玉軸受よりも軽量でスペースをとらず、ボールねじ装置を一層小型化することができる。 As described above, in the four-point contact ball bearing 40 of the first embodiment, the portion constituting the inner ring is integrally formed with the nut 30. Further, the outer race 41 of the first embodiment is separated into two of the divided bodies 41a and 41b at the position of the ball rolling groove bottom 41d at the front and rear in the axial direction. Furthermore, the four-point contact ball bearing 40 of the first embodiment is fixed by tightening the fixing screw 92 in the axial direction by the fixing portion 90 from the one end surface (end surface on the left side in FIG. Be done.
Thus, the four-point contact ball bearing 40 can be accurately positioned and preloaded, can simultaneously receive an axial load, a radial load and a moment load, and can reduce the bearing width. Therefore, for example, the ball screw device can be further miniaturized because it is lighter in weight and takes less space than a double row combination angular contact ball bearing.

つまり、この４点接触玉軸受４０は、外輪４１の分割体４１ａ，４１ｂの対向する端面間に、内外輪の軌道面４１ｋ，４２ｋとボール４３とが幾何的に４点接触した状態で適度な予圧が付与されるように分割体４１ａ，４１ｂが設計され、ハウジング８０への固定部９０による組み立て時に、分割体４１ａ，４１ｂ相互を軸方向に押し付けて、分割体４１ａ，４１ｂ相互の端面同士を接触させることで所期の予圧を付与可能になっている。なお、本実施形態では、ハウジング８０への固定部９０による組み立て例を示したが、これに限らず、例えば、軸受ナットや押え蓋によって分割体４１ａ，４１ｂ相互を軸方向に押し付けて、分割体４１ａ，４１ｂ相互の端面同士を接触させることで予圧を付与してもよい。   That is, the four-point contact ball bearing 40 is appropriate in a state where the raceways 41k and 42k of the inner and outer rings and the ball 43 geometrically contact at four points between the opposing end faces of the divided bodies 41a and 41b of the outer ring 41. The divided bodies 41a and 41b are designed to be preloaded, and when assembled by the fixing portion 90 to the housing 80, the divided bodies 41a and 41b are mutually pressed in the axial direction, and the end faces of the divided bodies 41a and 41b are mutually selected. The desired preload can be applied by contacting. In the present embodiment, an example of assembly using the fixing portion 90 to the housing 80 has been described, but the present invention is not limited thereto. For example, the divided bodies 41a and 41b may be axially pressed with each other by a bearing nut or a presser lid. A preload may be applied by bringing the end faces of the 41a and 41b into contact with each other.

さらに、この４点接触玉軸受４０は、外輪４１に給脂部４１ｍを有する。給脂部４１ｍは、外輪４１の径方向外型から外輪４１のボール転動溝底４１ｄに給脂可能に連通形成されている。第一実施形態においては、上述した外輪４１の分割体４１ａ，４１ｂの対向する端面間に画成された円環状隙間が給脂部４１ｍを構成している。
これにより、この４点接触玉軸受４０では、給脂口８０ｈから給脂部４１ｍを介して、軌道面４１ｋ、４２ｋとボール４３の周囲にグリース等の潤滑油を直接給脂できる。そのため、ボールねじ機構一体型の４点接触玉軸受４０において、軸受内部まで潤滑油を十分に行き渡らせる上で好適である。 Furthermore, the four-point contact ball bearing 40 has a grease supply portion 41 m in the outer ring 41. The oil supplying portion 41m is formed to communicate with the ball rolling groove bottom 41d of the outer ring 41 from the radial direction outer mold of the outer ring 41 so as to be able to supply oil. In the first embodiment, the annular gap defined between the opposing end faces of the divided bodies 41a and 41b of the outer ring 41 described above constitutes the oil supply portion 41m.
Thus, in the four-point contact ball bearing 40, lubricating oil such as grease can be directly lubricated around the raceways 41k and 42k and the ball 43 via the oil supply port 80h and the oil supply portion 41m. Therefore, in the ball screw mechanism integrated four-point contact ball bearing 40, it is suitable for sufficiently spreading the lubricating oil to the inside of the bearing.

ここで、上述したように、この４点接触玉軸受４０は、追加工が施される外輪４１がハウジング８０に固定部９０によって固定される構成なので、外輪４１の端面は、予め防炭処理が施された防炭処理部４１ｙとされている。しかし、防炭処理にあっては、軸受素材の段階で、流動性を有する防炭剤を塗布または浸漬する。そのため、防炭処理部４１ｙから外輪４１の軌道面４１ｋへの防炭剤の垂れ落ち等による侵入を防ぐ必要がある。
そこで、この４点接触玉軸受４０は、軸受素材の段階で、防炭処理部４１ｙが形成された外輪４１の端面と外輪４１の軌道面４１ｋとの間の外輪内周側の位置（同図に符号Ｘで示す位置）に、塗布または浸漬後の防炭剤の軌道面４１ｋへの移動を防止または抑制する防炭剤トラップ部４１ｔを形成している。この４点接触玉軸受４０を製造する際は、熱処理前の軸受素材の段階での外輪４１の端面に対し、防炭剤トラップ部４１ｔを防炭処理前に形成しておき、防炭剤トラップ部４１ｔの形成後に、外輪４１の端面の防炭処理部４１ｙに防炭剤を塗布または浸漬する。 Here, as described above, the 4-point contact ball bearing 40 is configured such that the outer ring 41 to be subjected to additional machining is fixed to the housing 80 by the fixing portion 90, so the end face of the outer ring 41 is pre-carburized. It is referred to as an applied anti-carburizing unit 41 y. However, in the case of anti-carburizing treatment, a fluid anti-carburizing agent is applied or immersed at the stage of the bearing material. Therefore, it is necessary to prevent the intrusion of the anti-carbon agent due to dripping or the like from the anti-carbon treating portion 41 y to the raceway surface 41 k of the outer ring 41.
Therefore, at the stage of the bearing material, the four-point contact ball bearing 40 is a position on the inner peripheral side of the outer ring between the end face of the outer ring 41 on which the carburizing treatment portion 41y is formed and the raceway surface 41k of the outer ring 41 (FIG. In a position indicated by a symbol X), an anti-carbostatic agent trap portion 41t is formed which prevents or suppresses the movement of the anti-carburizing agent to the raceway surface 41k after application or immersion. When manufacturing the four-point contact ball bearing 40, the anti-carburizing agent trap portion 41t is formed before the anti-carburizing treatment on the end face of the outer ring 41 at the stage of the bearing material before heat treatment. After the formation of the portion 41t, the anti-carburizing agent is applied or immersed in the anti-carburizing portion 41y of the end face of the outer ring 41.

特に、第一実施形態の４点接触玉軸受４０では、防炭剤トラップ部４１ｔのトラップ形状は、防炭処理部４１ｙが形成される端面側から順に、該端面の端に連続して外側から内側に向けて縮径するスロープ状の凹の円錐面を有する円錐部４１ｓと、該円錐部４１ｓの端に連続するフラットな凹の円環面を有する円環部４１ｎと、を備えて構成されている。円環部４１ｎの奥側は、防炭処理部４１ｙが形成される端面と並行な壁面４１ｈとなっている。
さらに、この４点接触玉軸受４０は、軌道面４１ｋの底を構成するボール転動溝底４１ｄの位置が、軸方向前後において防炭剤トラップ部４１ｔとは反対側にオフセットしており、これにより、ボール転動溝底４１ｄの位置に対して、防炭剤トラップ部４１ｔ側の分割体４１ａの軸方向長さαが、反対側の分割体４１ｂの軸方向長さβよりも長くなっている（α＞β）。また、クラウン型保持器４４は、リム側が反負荷側となるように、防炭剤トラップ部４１ｔ側とは反対の分割体４１ｂの側から装着されている。 In particular, in the four-point contact ball bearing 40 according to the first embodiment, the trap shape of the anti-carburizing agent trap portion 41t is continuous with the end of the end face from the end face side from the end face side where the anti-carburized part 41y is formed Comprising a conical portion 41s having a sloped concave conic surface which is diameter-reduced toward the inner side, and an annular portion 41n having a flat concave annular surface continuous with an end of the conical portion 41s ing. The back side of the annular portion 41 n is a wall surface 41 h parallel to the end face on which the anti-coking treatment portion 41 y is formed.
Furthermore, in the four-point contact ball bearing 40, the position of the ball rolling groove bottom 41d that constitutes the bottom of the raceway surface 41k is offset to the opposite side to the anti-carburizing agent trap portion 41t before and after the axial direction. As a result, the axial length .alpha. Of the divided member 41a on the side of the anti-carbon agent trapping portion 41t becomes longer than the axial length .beta. Of the divided member 41b on the opposite side with respect to the position of the ball rolling groove bottom 41d. (Α> β). Further, the crown-type cage 44 is mounted from the side of the divided body 41 b opposite to the side of the anti-carburizing agent trap portion 41 t so that the rim side is the anti-load side.

次に、上記４点接触玉軸受４０を備えるボールねじ装置１０の作用効果について説明する。
このボールねじ装置１０は、防炭剤の浸入防止軸受構造として、防炭剤トラップ部４１ｔを４点接触玉軸受４０に備えているので、防炭剤トラップ部４１ｔのトラップ形状による多段の凹または凸の段部が防炭剤を滞留させて、防炭剤の垂れ落ち等による軌道面４１ｋへの浸入を防止または抑制できる。
ここで、防炭剤の垂れ落ちは、防炭剤乾燥時の外輪４１の姿勢において、防炭剤の塗布面よりも軌道面４１ｋが低い位置にある場合に顕著に生じ得るところ、このボールねじ装置１０によれば、防炭剤の塗布面である防炭処理部４１ｙと軌道面４１ｋとの間に、凹または凸の段部が連続する複数の面および角からなる防炭剤トラップ部４１ｔを形成したので、防炭処理部４１ｙと軌道面４１ｋとが連続的に続いている場合でも、塗布面側から軌道面４１ｋ側へと垂れおちる防炭剤が、必ず防炭剤トラップ部４１ｔによる凹または凸の段部を通過することになる。よって、防炭剤トラップ部４１ｔによる凹または凸形状に形成された複数の面や角による界面間での界面張力や濡れ効果によって防炭剤を効果的にトラップできる。 Next, the operation and effect of the ball screw device 10 provided with the four-point contact ball bearing 40 will be described.
Since the ball screw device 10 has the four-point contact ball bearing 40 with the anti-carbon agent trap portion 41t as the anti-carbon agent intrusion preventing bearing structure, the multi-step concave or multi-cavity due to the trap shape of the anti-carbon agent trap portion 41t The convex step portion can hold the anti-carburizing agent, thereby preventing or suppressing the intrusion of the anti-carburizing agent to the raceway surface 41k due to dripping or the like.
Here, in the posture of the outer ring 41 at the time of drying the anti-carburizing agent, the dripping of the anti-carburizing agent can occur notably when the raceway surface 41k is at a lower position than the application surface of the anti-carburizing agent. According to the apparatus 10, the anti-carbon agent trap portion 41t is formed of a plurality of surfaces and corners in which concave or convex step portions are continuous between the anti-carbon treatment portion 41y which is the coated surface of the anti-carbon agent and the raceway surface 41k. Therefore, even when the anti-carburized portion 41y and the raceway surface 41k continue continuously, the anti-carburizing agent dripping from the coated surface side to the raceway surface 41k side is always by the anti-carburizing agent trap portion 41t. It will pass through the concave or convex steps. Therefore, it is possible to effectively trap the anti-carburizing agent by the interfacial tension and the wetting effect between the interfaces of the plurality of surfaces or corners formed in the concave or convex shape by the anti-carburizing agent trap portion 41t.

さらに、この４点接触玉軸受４０は、外輪軌道面４１ｋを構成するボール転動溝底４１ｄの位置をオフセットさせて、防炭剤トラップ部４１ｔ側の分割体４１ａの軸方向長さαが、反対側の分割体４１ｂの軸方向長さβよりも長くなっている（α＞β）ので、防炭剤トラップ部４１ｔを形成するスペースを可及的に長く確保するとともに、塗布面から軌道面４１ｋまでの距離を広げることにより、防炭剤の垂れ落ち等による軌道面４１ｋへの浸入を防止または抑制する上で好適である。
ここで、この４点接触玉軸受４０は、ナット３０に伝達された回転運動をねじ軸２０の直線運動として変換するボールねじ装置１０に用いられ、回転運動を行うナット３０を支持するものであるところ、トルク伝達部材７１への外部からの回転入力Ｒにより、トルク伝達部材７１とともにナット３０が所定量の回転をするとき、４点接触玉軸受４０は、内輪側に軸方向負荷（同図に示す符号Ｆ）を受ける。 Furthermore, the four-point contact ball bearing 40 offsets the position of the ball rolling groove bottom 41d that constitutes the outer ring raceway surface 41k, and the axial length α of the divided body 41a on the side of the anticarburizing agent trap portion 41t is Since it is longer than the axial length β of the divided body 41b on the opposite side (α> β), a space for forming the anti-carburizing agent trap portion 41t is secured as long as possible, and from the coated surface to the raceway surface By widening the distance to 41 k, it is suitable for preventing or suppressing the intrusion to the raceway surface 41 k due to the dripping or the like of the anti-carbon agent.
Here, the four-point contact ball bearing 40 is used for the ball screw device 10 that converts the rotational motion transmitted to the nut 30 as the linear motion of the screw shaft 20 and supports the nut 30 performing the rotational motion. By the way, when the nut 30 is rotated together with the torque transmission member 71 by a predetermined amount due to the external rotation input R to the torque transmission member 71, the four-point contact ball bearing 40 is axially loaded on the inner ring side (see FIG. Receive the code F).

これに対し、この４点接触玉軸受４０は、軌道面４１ｋの底を構成するボール転動溝底４１ｄの位置が、軸方向前後において内輪の反負荷側にオフセットしており、これにより、ボール転動溝底４１ｄの位置に対して、内輪の負荷側の軸方向での分割体４１ａの軸方向長さ（肉厚）αが、反負荷側の分割体４１ｂの軸方向長さ（肉厚）βよりも長くなっている（α＞β）ので、４点接触玉軸受４０の負荷側での内容積を広げることができる。
そのため、面圧大となる内輪部の負荷側に、より多くのグリースが配分されるため、４点接触玉軸受４０の良好な潤滑を長期間にわたって維持する上で好適である。また、クラウン型保持器４４は、そのリム側が反負荷側となるように、反負荷側の分割体４１ｂの側から装着されているので、保持器をコンパクトに構成しつつ、内輪部の負荷側の軸方向での分割体４１ａの軸方向長さ（肉厚）αをより厚肉にすることができる。 On the other hand, in the four-point contact ball bearing 40, the position of the ball rolling groove bottom 41d that constitutes the bottom of the raceway surface 41k is offset to the opposite load side of the inner ring in the axial direction. The axial length (thickness) α of divided body 41a in the axial direction on the load side of the inner ring with respect to the position of rolling groove bottom 41d is the axial length (thickness) of divided body 41b on the non-load side Since the length is longer than β) (α> β), the internal volume on the load side of the four-point contact ball bearing 40 can be expanded.
Therefore, more grease is distributed on the load side of the inner ring portion where the surface pressure increases, which is suitable for maintaining good lubrication of the four-point contact ball bearing 40 over a long period of time. Further, since the crown type cage 44 is mounted from the side of the divided body 41b on the non-load side so that the rim side is on the side opposite to the load side, the load side of the inner ring portion is formed while the cage is made compact. The axial length (thickness) α of the divided body 41 a in the axial direction of the above can be made thicker.

［第二実施形態］
図２に示すように、第二実施形態のボールねじ装置１０では、４点接触玉軸受４０は、内輪４２とナット３０とは別個の部品から構成されている点が上記第一実施形態と相違する。第二実施形態の内輪４２は、軸方向前後においてゴシックアーチ溝底の位置で分割され、円環状に形成された二つの分割体４２ａ，４２ｂから構成されている。
内輪４２は、各分割体４２ａ，４２ｂの内周面がナット３０の外周面に対して締め代を有し、内面に圧入用のねじが形成された円環状の装着ナット８２をトルク伝達部材７１とは反対の側から締めこむことにより圧入嵌合される。これにより、トルク伝達部材７１は、キー結合により円周方向に、軸受４０の内輪４２により軸方向に、それぞれナット３０と相対的に位置がずれることの無いように取り付けられる。
また、第二実施形態では、４点接触玉軸受４０の外輪４１は分割されておらず、一の中空円筒状部材から構成されている点が上記第一実施形態と相違する。さらに、第二実施形態では、外輪４１の給脂部４１ｍは、外輪４１の径方向外型から外輪４１のボール転動溝底４１ｄに給脂可能なように、円形横断面の貫通穴によって形成されている点が上記第一実施形態と相違する。 Second Embodiment
As shown in FIG. 2, in the ball screw device 10 according to the second embodiment, the four-point contact ball bearing 40 is different from the first embodiment in that the inner ring 42 and the nut 30 are formed of separate parts. Do. The inner ring 42 of the second embodiment is divided at the position of the gothic arch groove bottom in the axial direction, and is constituted by two divided bodies 42 a and 42 b formed in an annular shape.
The inner ring 42 has an annular mounting nut 82 having an interference with the outer peripheral surface of the nut 30 on the inner peripheral surface of each of the divided bodies 42a and 42b, and a screw for press-in formed on the inner surface. It is press fit by tightening from the opposite side. As a result, the torque transfer member 71 is mounted in the circumferential direction by the key connection and in the axial direction by the inner ring 42 of the bearing 40 so as not to be displaced relative to the nut 30 respectively.
In the second embodiment, the outer ring 41 of the four-point contact ball bearing 40 is not divided, and is different from the first embodiment in that the outer ring 41 is formed of one hollow cylindrical member. Furthermore, in the second embodiment, the oil supply portion 41m of the outer ring 41 is formed by a through hole with a circular cross section so that oil can be supplied from the radially outer mold of the outer ring 41 to the ball rolling groove bottom 41d of the outer ring 41. The second embodiment differs from the first embodiment in that

その他の構成は、上記第一実施形態と同様である。この第二実施形態のボールねじ装置１０においても、上記第一実施形態と同様の構成を有する防炭剤トラップ部４１ｔを４点接触玉軸受４０に備えている。よって、この第二実施形態においても、上記第一実施形態と同様に、防炭剤トラップ部４１ｔによる凹または凸形状に形成された複数の面および角による界面間での界面張力や濡れ効果によって防炭剤をトラップし、防炭剤の垂れ落ち等による軌道面４１ｋへの浸入を防止または抑制できる。
また、上記第一実施形態と同様に、外輪軌道面４１ｋを構成するボール転動溝底４１ｄの位置をオフセットさせて、ボール転動溝底４１ｄの位置に対し、防炭剤トラップ部４１ｔ側の軸方向長さαが、反対側の軸方向長さβよりも長くなっている（α＞β）ので、防炭剤トラップ部４１ｔを形成するスペースを確保するとともに、塗布面から軌道面４１ｋまでの距離を広げることにより、防炭剤の垂れ落ち等による軌道面４１ｋへの浸入を防止または抑制する上で好適である。 The other configuration is the same as that of the first embodiment. Also in the ball screw device 10 of the second embodiment, the four-point contact ball bearing 40 is provided with the anti-carbon agent trap portion 41t having the same configuration as that of the first embodiment. Therefore, also in the second embodiment, as in the first embodiment, the interface tension or the wetting effect between the interfaces formed by the plurality of surfaces and corners formed in the concave or convex shape by the anti-carburizing agent trap portion 41t. It is possible to trap the anti-carburizing agent and prevent or suppress the intrusion of the anti-carburizing agent to the raceway surface 41k due to dripping or the like.
Further, as in the first embodiment, the position of the ball rolling groove bottom 41d constituting the outer ring raceway surface 41k is offset to the side of the anti-carburizing agent trap portion 41t with respect to the position of the ball rolling groove bottom 41d. Since the axial length α is longer than the opposite axial length β (α> β), a space for forming the anti-carburizing agent trap portion 41t is secured, and from the coated surface to the raceway surface 41k This is suitable for preventing or suppressing the penetration of the anti-carburizing agent to the raceway surface 41k due to the dripping of the anti-carburizing agent or the like.

なお、本発明に係る防炭剤の浸入防止軸受構造およびこれを備える軸受並びにボールねじ装置は、上記各実施形態に限定されるものではなく、本発明の趣旨を逸脱しなければ種々の変形が可能である。
例えば、上記各実施形態では、防炭剤トラップ部のトラップ形状は、防炭処理部４１ｙが形成される端面側から順に、該端面の端に連続して外側から内側に向けて縮径する円錐面を有する円錐部４１ｓと、該円錐部４１ｓの端に連続する円環面を有する円環部４１ｎと、を有する例を示したが、これに限定されず、凹または凸形状に形成された複数の面および角による界面間での界面張力および濡れ効果によって防炭剤をトラップできれば、種々のトラップ形状を採用できる。 The anti-carburetion agent bearing structure according to the present invention and the bearing and ball screw device provided with the same are not limited to the above embodiments, and various modifications may be made without departing from the spirit of the present invention. It is possible.
For example, in each of the above-described embodiments, the trap shape of the anti-carburizing agent trap portion is a cone whose diameter decreases continuously from the outside to the inside continuously with the end of the end face from the end face side where the anti-carburized part 41 y is formed. Although an example having a conical portion 41s having a face and an annular portion 41n having an annular surface continuing to an end of the conical portion 41s is shown, the invention is not limited thereto, and it is formed in a concave or convex shape A variety of trap shapes can be employed as long as the agent can be trapped by interfacial tension and wetting effects between interfaces with multiple faces and corners.

例えば、図３に変形例を示す。なお、同図に示す例では、防炭剤乾燥時の外輪４１の素材を、テーブル面Ｔに対して防炭処理部４１ｙを上にして載置した姿勢で防炭剤を乾燥させるイメージを併せて示している。
同図（ａ）に示す例では、防炭剤トラップ部のトラップ形状は、防炭処理部４１ｙが形成される端面に連続して形成されて外側から内側に向けて縮径する凹の円錐面を有する円錐部４１ｓ（つまり、円錐部４１ｓのみが防炭剤トラップ部４１ｔに対応する）を備える。このような構成であっても、凹または凸形状に形成された面や角による界面間での界面張力や濡れ効果によって防炭剤をトラップできる。 For example, FIG. 3 shows a modification. In the example shown in the figure, the material of the outer ring 41 at the time of anti-carburizing agent drying is combined with an image of drying the anti-carburizing agent in a posture in which the anti-carburizing portion 41y is placed on the table surface T up. Is shown.
In the example shown in FIG. 6A, the trap shape of the anti-carburizing agent trap portion is a concave conical surface continuously formed on the end face on which the anti-carburized portion 41y is formed and having a diameter decreasing from the outside to the inside (I.e., only the conical portion 41s corresponds to the anti-carburetor trap portion 41t). Even with such a configuration, it is possible to trap the anti-carburizing agent by the interfacial tension and the wetting effect between the interfaces formed by the surfaces or corners formed in the concave or convex shape.

また、防炭剤トラップ部のトラップ形状は、防炭処理部４１ｙが形成される端面に連続して形成された凹の円環面を有する円環部４１ｎ（つまり、円環部４１ｎのみが防炭剤トラップ部４１ｔに対応する）を備える構成としてもよい（同図（ｂ）参照）。このような構成であっても、凹または凸形状に形成された面や角による界面間での界面張力や濡れ効果によって防炭剤をトラップできる。
さらに、防炭剤トラップ部４１ｔのトラップ形状は、より多段化してもよい。例えば、同図（ｃ）に示すように、防炭処理部４１ｙが形成される端面側から順に、該端面に連続する凹の円環面を有する第一円環部４１ｐと、該第一円環部４１ｐの端に連続して外側から内側に向けて縮径する凹の円錐面を有する円錐部４１ｓと、該円錐部４１ｓの端に連続する凹の円環面を有する第二円環部４１ｎと、を備える構成としてもよい。 In addition, the trap shape of the anti-carburizing agent trap portion is an annular portion 41 n having a concave annular surface continuously formed on the end face on which the anti-carburized portion 41 y is formed (that is, only the annular portion 41 n is prevented It is good also as composition provided with carbon agent trap part 41t (refer to the figure (b)). Even with such a configuration, it is possible to trap the anti-carburizing agent by the interfacial tension and the wetting effect between the interfaces formed by the surfaces or corners formed in the concave or convex shape.
Furthermore, the trap shape of the anti-carburizing agent trap portion 41t may be multi-tiered. For example, as shown in FIG. 6C, a first annular portion 41p having a concave annular surface continuing to the end face, in order from the end face side where the carbon-repellent treated part 41y is formed, and the first circle A second circular portion having a conical portion 41s having a concave conical surface decreasing in diameter continuously from the outside to the end of the annular portion 41p, and a concave toroidal surface continuing to the end of the conical portion 41s 41 n may be provided.

さらにまた、同図（ｃ）に示すように、凹または凸の段部の角の位置に、細幅の凹の溝部４１ｇを形成することが好ましい。細幅の溝部４１ｇを凹または凸の段部の角に設ければ、凹または凸形状に形成された面や角による界面間での界面張力や濡れ効果とともに、細幅の溝による毛管現象によって防炭剤の軌道面への移動をより好適に防止または抑制できる。   Furthermore, as shown in FIG. 6C, it is preferable to form a narrow concave groove 41g at the corner of the concave or convex step. If narrow grooves 41g are provided at the corners of concave or convex steps, interface tension or wetting effect between the interface formed by concave or convex surfaces and corners, and capillary effect by narrow grooves It is possible to more preferably prevent or suppress the movement of the anti-carburizing agent to the raceway surface.

１０ ボールねじ装置
２０ ねじ軸
２１ （ねじ軸の）ねじ溝（転動路）
３０ ナット
３１ （ナットの）ねじ溝（転動路）
３３ キー
４０ ４点接触玉軸受
４１ 外輪
４１ａ，４１ｂ （外輪の）分割体
４１ｄ ボール転動溝底
４１ｇ 溝部
４１ｈ 壁面
４１ｋ （外輪の）軌道面
４２ｋ （内輪側の）軌道面
４１ｍ 給脂部
４１ｓ 円錐部
４１ｎ，４１ｐ 円環部
４１ｔ 防炭剤トラップ部
４１ｙ 防炭処理部
４２ 内輪、内輪部
４２ａ，４２ｂ （内輪の）分割体
４２ｄ ボール転動溝底
４２ｋ （内輪の）軌道面
４３ ボール（転動体）
４４ クラウン型保持器
５０ ストッパ
５１ ストッパ部
６１ 係止部
７１ トルク伝達部材
８０ ハウジング
８２ 装着ナット
９０ 固定部
９１ 固定プレート
９２ 固定ねじ
Ｒ 回転入力 10 Ball screw device 20 Screw shaft 21 (Screw shaft) thread groove (rolling path)
30 Nut 31 (Nut's) thread groove (rolling path)
33 key 40 four-point contact ball bearing 41 outer ring 41a, 41b division body 41d (for outer ring) ball rolling groove bottom 41g groove 41h wall surface 41k (for outer ring) raceway surface 42k (for inner ring side) raceway surface 41m greasing portion 41s cone Portions 41n, 41p Annular portion 41t Anti-carburetor trap portion 41y Anti-carburizing portion 42 Inner ring, inner ring portions 42a, 42b (for inner ring) divided body 42d Ball rolling groove bottom 42k (for inner ring) Raceway surface 43 Ball (rolling element )
44 Crown type cage 50 Stopper 51 Stopper 61 Stopper 71 Torque transmission member 80 Housing 82 Mounting nut 90 Fixing part 91 Fixing plate 92 Fixing screw R Rotation input

Claims (8)

軸受の外輪端面に流動性を有する防炭剤の塗布または浸漬による防炭処理部が形成される軸受素材用の防炭剤の浸入防止軸受構造であって、
前記防炭処理部が形成される外輪の端面と前記外輪の軌道面との間の外輪内周側の位置に、前記塗布または浸漬後の防炭剤の前記外輪の軌道面への移動を防止または抑制する防炭剤トラップ部が形成されていることを特徴とする防炭剤の浸入防止軸受構造。 An anti-corrosion agent bearing structure for an anti-carburizing agent for a bearing material, wherein an anti-carburizing portion is formed by applying or immersing an anti-carburizing agent having fluidity to the outer ring end face of the bearing.
The movement of the anti-carburizing agent to the raceway surface of the outer ring after the application or immersion is prevented at a position on the inner peripheral side of the outer ring between the end face of the outer ring where the anti-carburized portion is formed and the raceway surface of the outer ring An anti-corrosion agent infiltration-preventing bearing structure characterized in that an anti-carburizing agent trap portion is formed. 前記防炭剤トラップ部のトラップ形状は、前記防炭処理部が形成される端面に連続して形成された凹の円環面を有する請求項１に記載の防炭剤の浸入防止軸受構造。   2. The bearing structure for preventing entry of a carbur agent according to claim 1, wherein the trap shape of the carbur agent trap portion has a concave annular surface continuously formed on an end face on which the carburized portion is formed. 前記防炭剤トラップ部のトラップ形状は、前記防炭処理部が形成される端面に連続して形成されて外側から内側に向けて縮径する凹の円錐面を有する請求項１に記載の防炭剤の浸入防止軸受構造。   The trap shape of the anti-carburizing agent trap portion has a concave conical surface continuously formed on the end face on which the anti-carburized portion is formed and having a diameter decreasing from the outer side to the inner side. Carbonaceous agent intrusion prevention bearing structure. 前記防炭剤トラップ部のトラップ形状は、前記防炭処理部が形成される端面側から順に、該端面の端に連続して外側から内側に向けて縮径する凹の円錐面と、該円錐面の端に連続する凹の円環面と、を有する請求項１に記載の防炭剤の浸入防止軸受構造。   The trap shape of the anti-carburizing agent trap portion is a concave conical surface which decreases in diameter continuously from the outside to the inside continuously with the end of the end face from the end face side on which the anti-carburized part is formed, and the cone The anti-corrosion agent intrusion preventing bearing structure according to claim 1, further comprising: a concave annular surface continuing to an end of the surface. 前記防炭剤トラップ部のトラップ形状は、前記防炭処理部が形成される端面側から順に、該端面に連続する凹の第一円環面と、該第一円環面の端に連続して外側から内側に向けて縮径する凹の円錐面と、該円錐面の端に連続する凹の第二円環面と、を有する請求項１に記載の防炭剤の浸入防止軸受構造。   The trap shape of the anti-carburizing agent trap portion is, in order from the end face side where the anti-carburized portion is formed, continuous to the concave first annular surface continuing to the end surface and the end of the first annular surface The anti-corrosion agent intrusion preventing bearing structure according to claim 1, further comprising: a concave conical surface whose diameter decreases from the outer side to the inner side; and a concave second annular surface continuing to an end of the conical surface. ナットに伝達された回転運動をねじ軸の直線運動として変換するボールねじ装置に用いられ、前記回転運動を行う前記ナットを支持するための４点接触玉軸受であって、
軌道面を構成するゴシックアーチ溝をそれぞれ有する内輪および外輪と、これら内輪および外輪の軌道面間に転動自在に介装される複数のボールと、これら複数のボールを保持するクラウン型保持器と、を有し、
前記外輪は、請求項１〜５のいずれか一項に記載の防炭剤の浸入防止軸受構造を有することを特徴とする４点接触玉軸受。 A four-point contact ball bearing for use in a ball screw device that converts rotational motion transmitted to a nut as linear motion of a screw shaft and for supporting the nut performing the rotational motion,
An inner ring and an outer ring each having a gothic arch groove constituting a raceway surface, a plurality of balls rollably interposed between the raceways of the inner ring and the outer ring, and a crown type cage for holding the plurality of balls And have
The four-point contact ball bearing according to any one of claims 1 to 5, wherein the outer ring has the anti-carburetor entry prevention bearing structure according to any one of claims 1 to 5. 前記軌道面を構成するゴシックアーチ溝底の位置は、軸方向前後において前記防炭剤トラップ部とは反対側にオフセットしており、前記ゴシックアーチ溝底の位置に対して、前記防炭剤トラップ部側の外輪軸方向長さが反対側の外輪軸方向長さよりも長くなっており、
前記クラウン型保持器は、前記防炭剤トラップ部側とは反対側または内輪の反対側から装着されている請求項６に記載の４点接触玉軸受。 The positions of the gothic arch groove bottoms constituting the raceway surface are offset on the opposite side of the anti-carburizing agent trap portion in the axial back and forth direction, and the anti-carburizing agent traps relative to the positions of the gothic arch groove bottoms. The outer ring axial length on the part side is longer than the axial length on the opposite side,
The four-point contact ball bearing according to claim 6, wherein the crown type cage is mounted from the opposite side to the side of the anticarbotor trap portion or the opposite side of the inner ring. 外周面に螺旋状の転動路を設けたねじ軸と、内周面に前記ねじ軸の転動路に対応する螺旋状の転動路を設けたナットと、前記ねじ軸及び前記ナット相互の転動路間に転動自在に介装される複数の転動体と、前記ナットに回転運動を伝達するトルク伝達部材と、回転運動を行う前記ナットを支持する４点接触玉軸受と、を備え、前記ナットに伝達された回転運動を前記ねじ軸の直線運動として変換するボールねじ装置であって、
前記４点接触玉軸受として、請求項６または７に記載の４点接触玉軸受を備えることを特徴とするボールねじ装置。 A screw shaft provided with a spiral rolling path on an outer peripheral surface, a nut provided on the inner peripheral surface with a spiral rolling path corresponding to the rolling path of the screw shaft, the screw shaft and the nut A plurality of rolling elements rotatably interposed between rolling paths, a torque transmission member transmitting rotational movement to the nut, and a four-point contact ball bearing supporting the nut performing rotational movement A ball screw device for converting the rotational motion transmitted to the nut as a linear motion of the screw shaft,
A ball screw apparatus comprising the four-point contact ball bearing according to claim 6 or 7 as the four-point contact ball bearing.
JP2017230581A 2017-11-30 2017-11-30 Bearing structure for preventing intrusion of carburizing agent, and four-point contact ball bearing and ball screw device provided with the same Active JP7119358B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113048147A (en) * 2021-03-11 2021-06-29 北京博鲁斯潘精密机床有限公司 High-precision linear motion guide rail of numerical control machine tool

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03236415A (en) * 1990-02-14 1991-10-22 Nippon Seiko Kk Method and device for applying carburization preventing agent at end part of metal parts
JPH0598415A (en) * 1991-02-04 1993-04-20 Three Bond Co Ltd Carburization control material
JPH06241248A (en) * 1993-02-18 1994-08-30 Ntn Corp Roller clutch unit
JP2002089550A (en) * 2000-09-14 2002-03-27 Koyo Seiko Co Ltd Shell type needle roller bearing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03236415A (en) * 1990-02-14 1991-10-22 Nippon Seiko Kk Method and device for applying carburization preventing agent at end part of metal parts
JPH0598415A (en) * 1991-02-04 1993-04-20 Three Bond Co Ltd Carburization control material
JPH06241248A (en) * 1993-02-18 1994-08-30 Ntn Corp Roller clutch unit
JP2002089550A (en) * 2000-09-14 2002-03-27 Koyo Seiko Co Ltd Shell type needle roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113048147A (en) * 2021-03-11 2021-06-29 北京博鲁斯潘精密机床有限公司 High-precision linear motion guide rail of numerical control machine tool

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