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JP2017180664A - Ball screw - Google Patents

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Publication number
JP2017180664A
JP2017180664A JP2016068765A JP2016068765A JP2017180664A JP 2017180664 A JP2017180664 A JP 2017180664A JP 2016068765 A JP2016068765 A JP 2016068765A JP 2016068765 A JP2016068765 A JP 2016068765A JP 2017180664 A JP2017180664 A JP 2017180664A
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Japan
Prior art keywords
oil
ball
ball screw
nut
oil supply
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JP2016068765A
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Japanese (ja)
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JP6777415B2 (en
Inventor
哲也 坂井
Tetsuya Sakai
哲也 坂井
正和 武石
Masakazu Takeishi
正和 武石
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DAIICHI SOKUHAN SEISAKUSHO KK
Nippon Thompson Co Ltd
Original Assignee
DAIICHI SOKUHAN SEISAKUSHO KK
Nippon Thompson Co Ltd
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Priority to JP2016068765A priority Critical patent/JP6777415B2/en
Priority to TW106106249A priority patent/TWI708017B/en
Priority to KR1020170040106A priority patent/KR102324533B1/en
Priority to CN201710201154.0A priority patent/CN107269788B/en
Publication of JP2017180664A publication Critical patent/JP2017180664A/en
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Publication of JP6777415B2 publication Critical patent/JP6777415B2/en
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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/04—Ball or roller bearings
    • F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
    • F16C29/0602—Details of the bearing body or carriage or parts thereof, e.g. methods for manufacturing or assembly
    • F16C29/0609—Details of the bearing body or carriage or parts thereof, e.g. methods for manufacturing or assembly of the ends of the bearing body or carriage where the rolling elements change direction, e.g. end caps
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/04—Ball or roller bearings
    • F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
    • F16C29/068—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track
    • F16C29/0683—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque
    • F16C29/0685—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • 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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • 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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F16H25/2418—Screw seals, wipers, scrapers or the like
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0497—Screw mechanisms

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Bearings For Parts Moving Linearly (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a ball screw that can be applied to incorporate into various kinds of equipment such as a mechatronic product or inspection device, and is configured to: always replenish lubricant from an oil-containing member to an oil supply member and contact a ball rolling on a direction change passage with the oil supply member to supply lubricant, thereby attaining maintenance free of lubrication.SOLUTION: A ball screw comprises a screw shaft 1 including a spiral groove 11 and a nut 2 relatively moving to the screw shaft. The nut 2 comprises: a nut body 3 formed with a raceway groove 12 and a return passage 13; an end cap 4 attached to the nut body 3 and including a spiral raceway passage 15 and a direction change passage 14 communicating with the return passage 13; an oil-containing member 5 disposed in the end cap 4; and an oil supply member 6 disposed in a communication hole 20 of the end cap 4.SELECTED DRAWING: Figure 3

Description

この発明は，例えば，精密位置決めテーブル等のメカトロ製品，検査装置等の各種機器に組み込んで使用され，ねじ軸と該ねじ軸上を相対移動するナットから成る給脂手段を備えたボールねじに関する。   The present invention relates to a ball screw provided with a greasing means including a screw shaft and a nut that moves relative to the screw shaft, which is used by being incorporated in various devices such as mechatronic products such as precision positioning tables and inspection devices.

従来，潤滑剤を自己潤滑によって安定的に供給する直動装置が知られている。該直動装置は，エンドデフレクタ式のボールねじ駆動装置であって，内周面に螺旋溝が形成されたナットと，該ナットの螺旋溝に対向する螺旋溝が外周面に形成されたねじ軸と，ナットの螺旋溝及びねじ軸の螺旋溝によって形成される螺旋状の軌道面の間に組み入れられた多数のボールとを備えており，ナットの内部には，軸方向に表面を含油性樹脂材料で一体的に射出成形した戻り通路が形成されるものである（例えば，特許文献１参照）。   Conventionally, a linear motion device that stably supplies a lubricant by self-lubricating is known. The linear motion device is an end deflector type ball screw drive device, and includes a nut having a spiral groove formed on an inner peripheral surface, and a screw shaft having a spiral groove opposed to the spiral groove of the nut formed on the outer peripheral surface. And a plurality of balls incorporated between the spiral raceway formed by the nut spiral groove and the screw shaft spiral groove, and the inside of the nut has an oil-impregnated resin surface in the axial direction. A return passage that is integrally injection-molded with a material is formed (see, for example, Patent Document 1).

また，本出願人は，設計の自由度を上げ，潤滑油の管理が簡単で且つ転動体に対する摺動抵抗が少ない転がり案内ユニットを開発し，先に特許出願した。該転がり案内ユニットは，レールを摺動自在に貫通させた筒部材と，該筒部材とレールとが相まって構成される軌道路と，筒部材に形成した軌道路の両端を方向転換路凹部を介して連通させた循環路と，該循環路及び上記軌道路を転走する複数の転動体とを備え，レールと筒部材との相対移動に応じて転動体が循環路及び軌道路内を循環するものである。上記転がり案内ユニットは，筒部材に形成した組み込み孔と，該組み込み孔に組み込んだ含油部材と，軌道路又は循環路における転動体の接触面に沿って設けた油供給部材とを備え，該油供給部材を含油部材に接触させたものである（例えば，特許文献２参照）。   In addition, the present applicant has developed a rolling guide unit with higher design freedom, easier management of lubricating oil and less sliding resistance against rolling elements, and has filed a patent application earlier. The rolling guide unit includes a cylindrical member through which a rail is slidably penetrated, a raceway formed by combining the tubular member and the rail, and both ends of the raceway formed in the cylindrical member via a direction change path recess. And a plurality of rolling elements that roll on the circulation path and the raceway, and the rolling elements circulate in the circulation path and the raceway according to the relative movement of the rail and the cylindrical member. Is. The rolling guide unit includes an assembly hole formed in the cylindrical member, an oil-impregnated member incorporated in the assembly hole, and an oil supply member provided along the contact surface of the rolling element in the raceway or the circulation path. The supply member is brought into contact with the oil-containing member (see, for example, Patent Document 2).

特開２０１３−１７４２５５号公報JP 2013-174255 A 特開２００６−３８１９５号公報JP 2006-38195 A

しかしながら，上記直動装置は，ナットの戻り通路に含油性樹脂材料を射出成形によってナットと一体成形したものである。上記含油性樹脂材料は樹脂材料と潤滑油とを予め混合し，該混合材を射出成形したものであるので，潤滑油容量が少なくなった時には潤滑油を補給ができず，潤滑不良になり易く，また，ナットと一体的に含油性樹脂材料を射出成形する必要があり，手間がかかる分，製造コストをアップするという問題があった。また，上記転がり案内ユニットは，ボールスプラインのエンドキャップの方向転換路に油供給部材，外筒に含油部材を備えることにより潤滑メンテナンスフリーを実現したものであるが，含油部材が組み込み孔に組み込まれており，含油部材から油供給部材への潤滑油の供給が十分でなく問題を有していた。   However, the linear motion device is an oil-impregnated resin material formed integrally with the nut by injection molding in the return passage of the nut. The above oil-impregnated resin material is obtained by mixing a resin material and lubricating oil in advance and then injection-molding the mixed material. Therefore, when the lubricating oil capacity decreases, the lubricating oil cannot be replenished, and lubrication tends to be poor. In addition, it is necessary to injection-mold the oil-containing resin material integrally with the nut, and there is a problem that the manufacturing cost is increased due to the time required. In addition, the rolling guide unit achieves lubrication maintenance-free by providing an oil supply member on the direction changing path of the end cap of the ball spline and an oil impregnation member on the outer cylinder, but the oil impregnation member is incorporated in the assembly hole. Therefore, the supply of lubricating oil from the oil-impregnated member to the oil supply member was not sufficient and had a problem.

この発明の目的は，上記の課題を解決することであり，精密位置決めテーブル等のメカトロ製品，検査装置等の各種の機器に組み込んで適用でき，インサイドリターンプレートで成るエンドキャップの外側端面に凹部を形成し，該凹部に潤滑剤を含浸し補給できる含油部材を配設し，装置自体を小型で簡素に構成すると共に，エンドキャップの方向転換路に開口する連通孔に油供給部材を嵌入し，含油部材と油供給部材とを潤滑剤を含浸した多孔質焼結樹脂で構成し，含油部材から油供給部材に潤滑剤を常時補給し，方向転換路を転走する転動体のボールに油供給部材の露出面を接触させて潤滑剤を確実に適正に供給して潤滑のメンテナンスフリーを達成したことを特徴とするボールねじを提供することである。   An object of the present invention is to solve the above-described problems, and can be applied by being incorporated in various devices such as mechatronic products such as precision positioning tables and inspection devices, and a recess is formed on the outer end surface of an end cap formed of an inside return plate. An oil-impregnated member that can be formed and impregnated with a lubricant and replenished is disposed, the device itself is small and simple, and an oil supply member is inserted into a communication hole that opens in the direction change path of the end cap. The oil-impregnated member and oil supply member are made of porous sintered resin impregnated with lubricant. The lubricant is constantly supplied from the oil-impregnated member to the oil supply member, and oil is supplied to the balls of the rolling elements rolling on the direction change path. It is an object of the present invention to provide a ball screw characterized in that the maintenance surface of lubrication is achieved by bringing the exposed surface of a member into contact with each other and reliably supplying a lubricant properly.

この発明は，複数の転動体であるボールが転動する第１螺旋溝が外周面に軸方向螺旋状に形成された回転可能なねじ軸，及び前記ねじ軸の前記外周面に嵌合し且つ前記第１螺旋溝に対向して前記ボールが転動する第２螺旋溝が内周面に軸方向螺旋状に形成された筒状のナットを有し，前記ナットが前記ねじ軸の回転に対応して前記ねじ軸上を長手方向に移動することから成るボールねじにおいて，
前記ナットは，前記第２螺旋溝と前記ボールが転走する長手方向に延びるリターン路とが形成された筒状のナット本体，前記ナット本体の両端部にそれぞれ配設され且つ前記第１螺旋溝と前記第２螺旋溝とで形成される螺旋状軌道路と前記リターン路とを連通する方向転換路が形成されたエンドキャップ，前記エンドキャップの外側端面に配設された潤滑剤が含浸された含油部材，及び前記エンドキャップに形成され且つ前記方向転換路と前記含油部材側の前記エンドキャップの前記外側端面とを連通する連通孔に配設された油供給部材から構成され，前記油供給部材の前記含油部材側の前記端面には前記含油部材に圧接する弾性的な凸部が一体的に設けられており，
前記油供給部材の一方の端面は前記方向転換路を転走する前記ボールに接触して前記潤滑剤を前記ボールに供給し，前記油供給部材の他方の端面は前記含油部材に当接して前記潤滑剤が前記油供給部材に補給されることを特徴とするボールねじに関する。 The present invention includes a rotatable screw shaft in which a first spiral groove on which a ball as a plurality of rolling elements rolls is formed in an axial spiral shape on an outer peripheral surface, and a fitting to the outer peripheral surface of the screw shaft; The second spiral groove on which the ball rolls facing the first spiral groove has a cylindrical nut formed in an axial spiral on the inner peripheral surface, and the nut corresponds to the rotation of the screw shaft. In a ball screw consisting of moving in the longitudinal direction on the screw shaft,
The nut is provided in a cylindrical nut body in which the second spiral groove and a return path extending in the longitudinal direction in which the ball rolls are formed, respectively, on both ends of the nut body, and the first spiral groove And an end cap formed with a direction change path that connects the spiral track formed by the second spiral groove and the return path, and a lubricant disposed on the outer end surface of the end cap was impregnated. The oil supply member includes an oil impregnation member, and an oil supply member formed in the end cap and disposed in a communication hole that communicates the direction change path and the outer end surface of the end cap on the oil impregnation member side. An elastic convex portion that is pressed against the oil-impregnated member is integrally provided on the end surface of the oil-impregnated member.
One end surface of the oil supply member contacts the ball rolling on the direction change path to supply the lubricant to the ball, and the other end surface of the oil supply member contacts the oil-containing member and The present invention relates to a ball screw characterized in that a lubricant is supplied to the oil supply member.

このボールねじは，前記ナットには前記含油部材の外面を覆うためのキャップが設けられており，前記キャップは前記エンドキャップと前記含油部材を介在して前記ナット本体に固定されているものである。また，前記ナット本体には，相手部材を取り付けるための取付け用孔が形成されたフランジ部を備えているものである。   In this ball screw, the nut is provided with a cap for covering the outer surface of the oil-containing member, and the cap is fixed to the nut body with the end cap and the oil-containing member interposed therebetween. . Further, the nut body is provided with a flange portion in which a mounting hole for mounting a mating member is formed.

また，前記含油部材は，前記エンドキャップの前記外側端面に配設された前記キャップ内に収容されており，前記キャップに設けたシール用凸部に方向を合わせるため，Ｃ形リング状に形成されている。このボールねじは，前記ねじ軸の回転に応答して，前記ボールが前記螺旋状軌道路，前記リターン路及び前記方向転換路から成る循環路を転走し，前記ナットが前記ねじ軸上を前記ボールを介して長手方向に相対的に移動するものである。   The oil-impregnated member is accommodated in the cap disposed on the outer end surface of the end cap, and is formed in a C-shaped ring shape in order to align the direction with the sealing convex portion provided on the cap. ing. In this ball screw, in response to the rotation of the screw shaft, the ball rolls on a circulation path composed of the spiral track, the return path, and the direction changing path, and the nut moves on the screw shaft. It moves relatively in the longitudinal direction via the ball.

また，前記ねじ軸は，両端部が回転可能に支持された丸軸タイプのボールねじ軸である。また，前記エンドキャップに形成された前記連通孔は，前記方向転換路のＲ状に曲がった外側壁面に開口しており，前記方向転換路に露出する前記油供給部材の端面は，前記Ｒ状に曲がった前記外側壁面と同じＲ状に曲がった形状に形成されている。   The screw shaft is a round shaft type ball screw shaft whose both ends are rotatably supported. The communication hole formed in the end cap opens to an outer wall surface bent in an R shape of the direction change path, and an end surface of the oil supply member exposed to the direction change path is the R shape. It is formed in the shape bent in the same R shape as the outer wall surface bent in the direction.

また，前記油供給部材の前記方向転換路に露出する前記端面の幅は，前記ボールの径の実質的に１／４〜１／２の範囲に設定して形成されている。また，前記エンドキャップは，前記螺旋状軌道路と前記リターン路とを連通する前記方向転換路が形成された凸部と前記螺旋状軌道路側の前記ボールをすくうためのすくい爪とが形成されたインサイドリターンプレートであり，前記インサイドリターンプレートの前記凸部が前記ナット本体の端部に形成された前記第２螺旋溝の端部と連通する凹部に嵌合している。   In addition, the width of the end surface exposed to the direction change path of the oil supply member is formed to be substantially in a range of 1/4 to 1/2 of the diameter of the ball. Further, the end cap is formed with a convex portion formed with the direction changing path communicating the spiral path and the return path, and a rake claw for scooping the ball on the spiral path side. It is an inside return plate, The said convex part of the said inside return plate is fitted in the recessed part connected with the edge part of the said 2nd spiral groove formed in the edge part of the said nut main body.

更に，前記含油部材及び前記油供給部材は，ポリエチレン又はポリプロピレンの合成樹脂微粒子を押し固めて加熱成形し且つ前記合成樹脂微粒子間が連通状態に保形された多孔部を備えた多孔質成形体で形成し，前記多孔部に前記潤滑剤が含浸されているものである。   Further, the oil-containing member and the oil supply member are a porous molded body having a porous portion in which synthetic resin fine particles of polyethylene or polypropylene are pressed and heat-molded and the synthetic resin fine particles are kept in communication with each other. The porous part is formed and impregnated with the lubricant.

この発明によるボールねじは，上記のように構成されており，装置自体を簡素な小型に構成し，エンドキャップの外側端面に形成した凹部に配設した含油部材には潤滑剤を多量に含浸させることができ，エンドキャップの連通孔に配設した油供給部材の凸部を含油部材に圧接させ，それにより潤滑剤が毛細管現象等で確実にスムーズに前記含油部材から前記油供給部へ移動できるように構成し，含油部材に含浸された潤滑剤を油供給部材にスムーズに補給させ，方向転換路を転走するボールが油供給部材の露出端面に接することによって，油供給部材から容易に潤滑剤が滲み出てボールに潤滑剤が供給され，ボールねじの潤滑メンテナンスフリーを実現することができる。また，このボールねじは，キャップの凹部に配設される含油部材がＣ形リングに形成されている。また，キャップの内周側には，ねじ軸の螺旋溝に合せてシール用凸部を設けており，該シール用凸部によって異物の侵入を防止することができる。また，含油部材は外側がキャップで覆われているので，潤滑剤が飛散して周囲環境を悪化させることが無いものである。   The ball screw according to the present invention is configured as described above, and the apparatus itself is configured to be simple and compact, and the oil-impregnated member disposed in the recess formed on the outer end surface of the end cap is impregnated with a large amount of lubricant. The protruding portion of the oil supply member disposed in the communication hole of the end cap can be brought into pressure contact with the oil-containing member, so that the lubricant can be smoothly and smoothly moved from the oil-containing member to the oil supply portion by capillary action or the like. The oil supply member is smoothly replenished with the lubricant impregnated in the oil-impregnated member, and the ball rolling on the direction change path is in contact with the exposed end surface of the oil supply member so that the oil supply member can easily lubricate. The agent oozes out and the lubricant is supplied to the ball, making it possible to achieve a maintenance free of ball screw lubrication. Further, in this ball screw, an oil-containing member disposed in a concave portion of the cap is formed in a C-shaped ring. Further, a sealing convex portion is provided on the inner peripheral side of the cap in accordance with the spiral groove of the screw shaft, and entry of foreign matter can be prevented by the sealing convex portion. Moreover, since the oil-impregnated member is covered with a cap, the lubricant does not scatter and does not deteriorate the surrounding environment.

この発明によるボールねじの一実施例をを示す斜視図である。It is a perspective view which shows one Example of the ball screw by this invention. 図１のボールねじを示す分解斜視図である。It is a disassembled perspective view which shows the ball screw of FIG. 図１のボールねじの一部を破断してボールが転走する循環路の一部を示す側面図である。FIG. 2 is a side view showing a part of a circulation path in which a part of the ball screw in FIG. 1 is broken and the ball rolls. 図３のボールねじを構成するエンドキャップの外側端面を示す正面図である。It is a front view which shows the outer side end surface of the end cap which comprises the ball screw of FIG. 図４のボールねじを構成するエンドキャップのＡ−Ａ位置における断面図である。It is sectional drawing in the AA position of the end cap which comprises the ball screw of FIG. 図４のエンドキャップの内側端面を示す背面図である。It is a rear view which shows the inner side end surface of the end cap of FIG. 図１のボールねじを構成する油供給部材を示し，（Ａ）は側面図であり，（Ｂ）は上面図である。The oil supply member which comprises the ball screw of FIG. 1 is shown, (A) is a side view, (B) is a top view. 図１のボールねじを構成する含油部材を示し，（Ａ）は正面図であり，（Ｂ）は側面図である。The oil impregnation member which comprises the ball screw of FIG. 1 is shown, (A) is a front view, (B) is a side view. 図１のボールねじを構成するキャップを示しており，（Ａ）は内側端面を示す背面図，（Ｂ）は（Ａ）におけるＢ−Ｂ位置を示す断面図，（Ｃ）は外側端面を示す正面図，及び（Ｄ）は側面図である。FIG. 2 shows a cap constituting the ball screw of FIG. 1, (A) is a rear view showing an inner end face, (B) is a cross-sectional view showing a BB position in (A), and (C) shows an outer end face. A front view and (D) are side views.

以下，図面を参照して，この発明によるボールねじの一実施例を説明する。この発明によるボールねじは，図１〜図３に示すように，複数の転動体であるボール９が転動する螺旋溝１１（第１螺旋溝）が外周面１０に軸方向に形成された回転可能なボールねじ軸であるねじ軸１，及びねじ軸１の外周面１０に嵌合し且つ螺旋溝１１に対向してボール９が転動する螺旋溝１２（第２螺旋溝）が内周面１７に軸方向に形成された筒状のナット２から構成されており，ねじ軸１の回転に対応してナット２がねじ軸１上を長手方向に相対移動するものである。   Hereinafter, an embodiment of a ball screw according to the present invention will be described with reference to the drawings. In the ball screw according to the present invention, as shown in FIGS. 1 to 3, a spiral groove 11 (first spiral groove) on which a ball 9 as a plurality of rolling elements rolls is formed in the outer peripheral surface 10 in the axial direction. A spiral groove 12 (second spiral groove) that fits the screw shaft 1, which is a possible ball screw shaft, and the outer peripheral surface 10 of the screw shaft 1 and the ball 9 rolls against the spiral groove 11 is an inner peripheral surface. 17 includes a cylindrical nut 2 formed in the axial direction, and the nut 2 relatively moves in the longitudinal direction on the screw shaft 1 in response to the rotation of the screw shaft 1.

このボールねじにおいて，特に，ナット２は，螺旋溝１２と，ボール９が転走する長手方向に延びるリターン路１３とが形成された筒状のナット本体３，ナット本体３の両端面４７にそれぞれ配設され且つ螺旋溝１１と螺旋溝１２とで形成される螺旋状軌道路１５とリターン路１３とを連通する方向転換路１４が形成されたエンドキャップ４，エンドキャップ４の外側端面１９に配設された潤滑剤が含浸された含油部材５，及びエンドキャップ４に形成され且つ方向転換路１４と含油部材５側のエンドキャップ４の外側端面１９とを連通する連通孔２０に配設された油供給部材６から構成されていることを特徴としている。このボールねじは，ナット２には含油部材５の外面２４を覆うためのキャップ７が設けられている。キャップ７は，エンドキャップ４と含油部材５を介在してナット本体３に固定ねじ３１によって固定されている。ナット本体３には，その端面４７に複数箇所の取付け用ねじ穴４６が形成されている。固定ねじ３１は，キャップ７のザグリ取付け用孔４１，含油部材５の凹部３６及びエンドキャップ４の取付け用孔４３を挿通してナット本体３の取付け用ねじ穴４６に螺入し，ナット本体３にエンドキャップ４，含油部材５及びキャップ７が固定される。   In this ball screw, in particular, the nut 2 is respectively formed on a cylindrical nut body 3 formed with a spiral groove 12 and a return path 13 extending in the longitudinal direction along which the ball 9 rolls, on both end faces 47 of the nut body 3. The end cap 4 is formed on the outer end surface 19 of the end cap 4 and the end cap 4 formed with the direction change path 14 that communicates the spiral path 15 formed by the spiral groove 11 and the spiral groove 12 and the return path 13. The oil-impregnated member 5 impregnated with the provided lubricant and the end cap 4 are formed in a communication hole 20 that communicates the direction change path 14 and the outer end surface 19 of the end cap 4 on the oil-impregnated member 5 side. It is characterized by comprising an oil supply member 6. In this ball screw, the nut 2 is provided with a cap 7 for covering the outer surface 24 of the oil retaining member 5. The cap 7 is fixed to the nut body 3 by a fixing screw 31 with the end cap 4 and the oil impregnated member 5 interposed therebetween. A plurality of mounting screw holes 46 are formed in the end surface 47 of the nut body 3. The fixing screw 31 is inserted into the counterbore mounting hole 41 of the cap 7, the recess 36 of the oil retaining member 5, and the mounting hole 43 of the end cap 4 and screwed into the mounting screw hole 46 of the nut body 3. The end cap 4, the oil-impregnated member 5 and the cap 7 are fixed to each other.

このボールねじは，ねじ軸１がナット２を嵌挿しており，ねじ軸１がナット２を嵌挿するため，ナット２を構成するナット本体３には嵌挿孔３３，エンドキャップ４には嵌挿孔３４，含油部材５には嵌挿孔３５，及びキャップ７には嵌挿孔３７がそれぞれ対向整合して形成されている。また，含油部材５は，エンドキャップ４の外側端面１９に配設されたキャップ７内に収容されており，キャップ７に設けたシール用凸部３０に方向を合わせるためＣ形リング状の一部が切欠き部３２に形成されている。シール用凸部３０は，ねじ軸１の螺旋溝１１に合せて設けられている，シール用凸部３０は，ねじ軸１とナット２との隙間を小さくし，一種のラビリンスシールとして機能し，異物が侵入するのを防止することができる。キャップ７と含油部材との組み付け時には，キャップ７のシール用凸部３０と含油部材５の切欠き部３２を合せて取り付けられる。含油部材５は，その外周面に固定ねじ３１が挿通する凹部３６が形成されている。キャップ７は，中央にねじ軸１が嵌挿する嵌挿孔３７に，外側が含油部材５を覆う端面３８に，周囲がリング状の外周面３９に形成されており，外周面３９の内側に含油部材５を収容する凹部４０が形成されている。また，キャップ７には，固定ねじ３１を挿通するためのザグリ取付け用孔４１が複数箇所（図９では４箇所）設けられている。含油部材５は，キャップ７の凹部４０に収容され，外側が覆われた状態で組み込まれる。   In this ball screw, since the screw shaft 1 is fitted with the nut 2 and the screw shaft 1 is fitted with the nut 2, the nut body 3 constituting the nut 2 is fitted into the fitting hole 33 and the end cap 4. An insertion hole 35 is formed in the insertion hole 34, the oil retaining member 5, and an insertion hole 37 is formed in the cap 7 so as to face each other. The oil-impregnated member 5 is accommodated in a cap 7 disposed on the outer end surface 19 of the end cap 4, and a part of a C-shaped ring shape is used in order to align the direction with a seal projection 30 provided on the cap 7. Is formed in the notch 32. The sealing convex part 30 is provided in accordance with the spiral groove 11 of the screw shaft 1. The sealing convex part 30 reduces the gap between the screw shaft 1 and the nut 2 and functions as a kind of labyrinth seal. It is possible to prevent foreign matter from entering. When the cap 7 and the oil-impregnated member are assembled, the sealing convex portion 30 of the cap 7 and the notch 32 of the oil-impregnated member 5 are attached together. The oil-impregnated member 5 has a recess 36 formed in the outer peripheral surface thereof through which the fixing screw 31 is inserted. The cap 7 is formed at the center in a fitting hole 37 into which the screw shaft 1 is fitted, the outer side is formed on an end surface 38 that covers the oil-impregnated member 5, and the periphery is formed on a ring-shaped outer circumferential surface 39. A recess 40 for accommodating the oil-containing member 5 is formed. Further, the cap 7 is provided with a plurality of counterbore mounting holes 41 (four in FIG. 9) through which the fixing screw 31 is inserted. The oil-impregnated member 5 is accommodated in the recess 40 of the cap 7 and is incorporated with its outer side covered.

このボールねじにおいて，ねじ軸１は，両端部２６が回転可能に支持された丸軸タイプのボールねじ軸に構成されている。また，ナット本体３には，ワーク，工具，機器等の相手部材を取り付けるため一方の端部１８に取付け用孔２５が形成されたフランジ部８を備えている。エンドキャップ４は，一種のインサイドリターンプレートを構成する凸部３０には，ねじ軸１側の螺旋溝１１を転動してくるボール９をすくうためのすくい爪２９と，ボール９を方向転換させる方向転換路１４と，方向転換路１４からリターン路１３へボール９を案内するための出入口である口元部とが形成されている。エンドキャップ４は，その凸部３０がナット本体３の端部１８に形成された嵌合穴である凹部２８に嵌入しており，エンドキャップ４に形成された方向転換路１４は，ナット本体３に形成された螺旋溝１２に連通している。   In this ball screw, the screw shaft 1 is configured as a round shaft type ball screw shaft in which both end portions 26 are rotatably supported. Further, the nut body 3 is provided with a flange portion 8 in which a mounting hole 25 is formed at one end portion 18 for attaching a mating member such as a work, a tool, or an equipment. The end cap 4 has a convex portion 30 constituting a kind of inside return plate, a rake claw 29 for scooping the ball 9 rolling on the spiral groove 11 on the screw shaft 1 side, and a direction change of the ball 9. A direction changing path 14 and a mouth portion that is an entrance for guiding the ball 9 from the direction changing path 14 to the return path 13 are formed. The end cap 4 has a convex portion 30 fitted into a concave portion 28 which is a fitting hole formed in the end portion 18 of the nut body 3, and the direction changing path 14 formed in the end cap 4 is connected to the nut body 3. It communicates with the spiral groove 12 formed in the.

このボールねじでは，ボール９の循環路１６は，ボール９がねじ軸１の螺旋溝１１とナット本体３の螺旋溝１２とが対向して構成される螺旋状軌道路１５，ナット本体３に形成されたリターン路１３，及び一対のエンドキャップ４にそれぞれ形成された方向転換路１４から構成されている。このボールねじは，概して，ねじ軸１の回転に応答してボール９が循環路１６を転走し，ナット２がねじ軸１上をボール９を介して長手方向に相対的に移動するものである。   In this ball screw, the circulation path 16 of the ball 9 is formed in a spiral raceway 15 and a nut body 3 in which the ball 9 is configured such that the spiral groove 11 of the screw shaft 1 and the spiral groove 12 of the nut body 3 face each other. The return path 13 and the direction change paths 14 respectively formed in the pair of end caps 4 are configured. In general, the ball screw is configured such that the ball 9 rolls in the circulation path 16 in response to the rotation of the screw shaft 1, and the nut 2 moves relatively on the screw shaft 1 in the longitudinal direction via the ball 9. is there.

このボールねじは，エンドキャップ４の外側に配設された含油部材５から油供給部材６を通して方向転換路１４を転走するボール９に潤滑剤を供給するものである。エンドキャップ４に凸部３０が形成された端面４２とは反対側の外側端面１９（図２）に含油部材５が配設されている。エンドキャップ４に形成された連通孔２０は，一端が方向転換路１４のＲ状に曲がった外側壁面２７の長方形の開口部４４で開口し，他端がエンドキャップ４の外側端面１９に開口している。エンドキャップ４に形成された連通孔２０には，油供給部材６が嵌入しており，方向転換路１４に露出する油供給部材６の端面２２は，方向転換路１４の外側壁面２７に対応して同じＲ状に曲がった形状に形成されている。特に，油供給部材６の含油部材５側の端面２１には潤滑剤が確実に供給されるように含油部材５の内側端面４５に圧接する弾性的な凸部２３が一体的に設けられている。このボールねじは，油供給部材６の一端側の凸部２３が含油部材５のエンドキャップ４側の端面２２に当接して配設されているので，固定ねじ３１がナット本体３の取付け用ねじ穴４６に螺入することによって，凸部２３が圧接させた状態になって，ナット本体３にエンドキャップ４，油供給部材６，含油部材５及びキャップ７が固定される。油供給部材６の凸部２３が含油部材５の端面４５に圧接状態に取り付けられることによって，含油部材５に含浸された潤滑剤が油供給部材６にスムーズに移動することができ，含油部材５に含浸された潤滑剤を油供給部材６に確実にスムーズに補給されることになる。また，油供給部材６の一方の端面２２は，方向転換路１４を転走するボール９に接触して潤滑剤をボール９に供給し，油供給部材６の他方の端面２１は，含油部材５に当接して潤滑剤が油供給部材６に補給されるように構成されている。また，油供給部材６は，平板状であって，方向転換路１４に露出する端面２２は，実質的に長方形で長手方向に伸びるＲ状の円弧面に形成されており，油供給部材６の端面２２の幅は，ボール９の径の実質的に１／４〜１／２の範囲に設定して形成されており，油供給部材６からボール９に適量の潤滑剤が供給されるように構成されている。   This ball screw supplies lubricant from the oil retaining member 5 disposed outside the end cap 4 to the ball 9 rolling on the direction change path 14 through the oil supply member 6. The oil-impregnated member 5 is disposed on the outer end surface 19 (FIG. 2) opposite to the end surface 42 on which the convex portion 30 is formed on the end cap 4. One end of the communication hole 20 formed in the end cap 4 opens at the rectangular opening 44 of the outer wall surface 27 bent in the R shape of the direction change path 14, and the other end opens at the outer end surface 19 of the end cap 4. ing. The oil supply member 6 is fitted into the communication hole 20 formed in the end cap 4, and the end surface 22 of the oil supply member 6 exposed to the direction change path 14 corresponds to the outer wall surface 27 of the direction change path 14. Are formed in the same curved shape. In particular, the end face 21 of the oil supply member 6 on the oil impregnated member 5 side is integrally provided with an elastic convex portion 23 that presses against the inner end face 45 of the oil impregnated member 5 so that the lubricant is reliably supplied. . In this ball screw, the protruding portion 23 on one end side of the oil supply member 6 is disposed in contact with the end surface 22 on the end cap 4 side of the oil-containing member 5, so that the fixing screw 31 is a mounting screw for the nut body 3. By screwing into the hole 46, the convex portion 23 is brought into pressure contact, and the end cap 4, the oil supply member 6, the oil-containing member 5, and the cap 7 are fixed to the nut body 3. By attaching the convex portion 23 of the oil supply member 6 to the end face 45 of the oil-containing member 5 in a pressure contact state, the lubricant impregnated in the oil-containing member 5 can smoothly move to the oil supply member 6. The oil impregnated in the oil supply member 6 is surely and smoothly supplied. One end surface 22 of the oil supply member 6 contacts the ball 9 rolling on the direction change path 14 to supply the lubricant to the ball 9, and the other end surface 21 of the oil supply member 6 is connected to the oil-containing member 5. The lubricant is supplied to the oil supply member 6 in contact with the oil supply member 6. The oil supply member 6 has a flat plate shape, and the end surface 22 exposed to the direction changing path 14 is formed in a substantially rectangular rectangular shape extending in the longitudinal direction. The width of the end face 22 is set to a range substantially ¼ to ½ of the diameter of the ball 9 so that an appropriate amount of lubricant is supplied to the ball 9 from the oil supply member 6. It is configured.

このボールねじにおいて，含油部材５及び油供給部材６は，ポリエチレン又はポリプロピレンの合成樹脂微粒子を押し固めて加熱成形し且つ前記合成樹脂微粒子間が連通状態に保形された多孔部を備えた多孔質成形体で形成し，前記多孔部に前記潤滑剤が含浸されている。従って，このボールねじは，油供給部材６が方向転換路１４に露出しているので，方向転換路１４を転走するボール９は，油供給部材６の端面２２に接触し，含油部材５及び油供給部６に含浸されている潤滑剤がボール９に供給され，潤滑のメンテナンスフリーを達成することができる。また，このボールねじについて，ボールねじ仕様は，例えば，ねじ軸１の軸径がφ１５に形成され，ねじ軸１の外周面１０に形成された螺旋溝１１は一条列に形成され，リードは３０に形成することができる。   In this ball screw, the oil-impregnated member 5 and the oil supply member 6 have a porous portion having a porous portion in which synthetic resin fine particles of polyethylene or polypropylene are pressed and heat-molded and the synthetic resin fine particles are kept in communication with each other. The molded body is formed and the porous portion is impregnated with the lubricant. Accordingly, since the oil supply member 6 is exposed to the direction change path 14 in this ball screw, the ball 9 rolling on the direction change path 14 comes into contact with the end face 22 of the oil supply member 6, and the oil impregnating member 5 and Lubricant impregnated in the oil supply unit 6 is supplied to the balls 9 and lubrication maintenance-free can be achieved. The ball screw specifications of this ball screw are, for example, such that the shaft diameter of the screw shaft 1 is formed to φ15, the spiral groove 11 formed on the outer peripheral surface 10 of the screw shaft 1 is formed in a single row, and the lead is 30 Can be formed.

この発明によるボールねじは，精密位置決めテーブル等のメカトロ製品，検査装置等の各種機器に適用して好ましいものである。   The ball screw according to the present invention is preferably applied to various devices such as mechatronic products such as precision positioning tables and inspection devices.

１ ねじ軸
２ ナット
３ ナット本体
４ エンドキャップ
５ 含油部材
６ 油供給部材
７ キャップ
８ フランジ部
９ ボール（転動体）
１０，３９ 外周面
１１ 螺旋溝（第１螺旋溝）
１２ 螺旋溝（第２螺旋溝）
１３ リターン路
１４ 方向転換路
１５ 螺旋状軌道路
１６ 循環路
１７ 内周面
１８，２６ 端部
１９ 外側端面
２０ 連通孔
２１，２２，３８ 端面
２３，３０ 凸部
２４ 外面
２５ 取付け用孔
２７ 外側壁面
２８ 凹部
３２ 切欠き部 DESCRIPTION OF SYMBOLS 1 Screw shaft 2 Nut 3 Nut main body 4 End cap 5 Oil impregnation member 6 Oil supply member 7 Cap 8 Flange part 9 Ball (rolling element)
10, 39 Outer peripheral surface 11 Spiral groove (first spiral groove)
12 Spiral groove (second spiral groove)
DESCRIPTION OF SYMBOLS 13 Return path 14 Direction change path 15 Spiral track 16 Circulation path 17 Inner peripheral surface 18,26 End part 19 Outer end surface 20 Communication hole 21,22,38 End surface 23,30 Convex part 24 Outer surface 25 Mounting hole 27 Outer wall surface 28 Recess 32 Notch

この発明は，例えば，精密位置決めテーブル等のメカトロ製品，検査装置等の各種機器に組み込んで使用され，ねじ軸と該ねじ軸上を相対移動するナットから成る給脂手段を備えたボールねじに関する。   The present invention relates to a ball screw provided with a greasing means including a screw shaft and a nut that moves relative to the screw shaft, which is used by being incorporated in various devices such as mechatronic products such as precision positioning tables and inspection devices.

従来，潤滑剤を自己潤滑によって安定的に供給する直動装置が知られている。該直動装置は，エンドデフレクタ式のボールねじ駆動装置であって，内周面に螺旋溝が形成されたナットと，該ナットの螺旋溝に対向する螺旋溝が外周面に形成されたねじ軸と，ナットの螺旋溝及びねじ軸の螺旋溝によって形成される螺旋状の軌道面の間に組み入れられた多数のボールとを備えており，ナットの内部には，軸方向に表面を含油性樹脂材料で一体的に射出成形した戻り通路が形成されるものである（例えば，特許文献１参照）。   Conventionally, a linear motion device that stably supplies a lubricant by self-lubricating is known. The linear motion device is an end deflector type ball screw drive device, and includes a nut having a spiral groove formed on an inner peripheral surface, and a screw shaft having a spiral groove opposed to the spiral groove of the nut formed on the outer peripheral surface. And a plurality of balls incorporated between the spiral raceway formed by the nut spiral groove and the screw shaft spiral groove, and the inside of the nut has an oil-impregnated resin surface in the axial direction. A return passage that is integrally injection-molded with a material is formed (see, for example, Patent Document 1).

また，本出願人は，設計の自由度を上げ，潤滑油の管理が簡単で且つ転動体に対する摺動抵抗が少ない転がり案内ユニットを開発し，先に特許出願した。該転がり案内ユニットは，レールを摺動自在に貫通させた筒部材と，該筒部材とレールとが相まって構成される軌道路と，筒部材に形成した軌道路の両端を方向転換路凹部を介して連通させた循環路と，該循環路及び上記軌道路を転走する複数の転動体とを備え，レールと筒部材との相対移動に応じて転動体が循環路及び軌道路内を循環するものである。上記転がり案内ユニットは，筒部材に形成した組み込み孔と，該組み込み孔に組み込んだ含油部材と，軌道路又は循環路における転動体の接触面に沿って設けた油供給部材とを備え，該油供給部材を含油部材に接触させたものである（例えば，特許文献２参照）。   In addition, the present applicant has developed a rolling guide unit with higher design freedom, easier management of lubricating oil and less sliding resistance against rolling elements, and has filed a patent application earlier. The rolling guide unit includes a cylindrical member through which a rail is slidably penetrated, a raceway formed by combining the tubular member and the rail, and both ends of the raceway formed in the cylindrical member via a direction change path recess. And a plurality of rolling elements that roll on the circulation path and the raceway, and the rolling elements circulate in the circulation path and the raceway according to the relative movement of the rail and the cylindrical member. Is. The rolling guide unit includes an assembly hole formed in the cylindrical member, an oil-impregnated member incorporated in the assembly hole, and an oil supply member provided along the contact surface of the rolling element in the raceway or the circulation path. The supply member is brought into contact with the oil-containing member (see, for example, Patent Document 2).

特開２０１３−１７４２５５号公報JP 2013-174255 A 特開２００６−３８１９５号公報JP 2006-38195 A

しかしながら，上記直動装置は，ナットの戻り通路に含油性樹脂材料を射出成形によってナットと一体成形したものである。上記含油性樹脂材料は樹脂材料と潤滑油とを予め混合し，該混合材を射出成形したものであるので，潤滑油容量が少なくなった時には潤滑油を補給ができず，潤滑不良になり易く，また，ナットと一体的に含油性樹脂材料を射出成形する必要があり，手間がかかる分，製造コストをアップするという問題があった。また，上記転がり案内ユニットは，ボールスプラインのエンドキャップの方向転換路に油供給部材，外筒に含油部材を備えることにより潤滑メンテナンスフリーを実現したものであるが，含油部材が組み込み孔に組み込まれており，含油部材から油供給部材への潤滑油の供給が十分でなく問題を有していた。   However, the linear motion device is an oil-impregnated resin material formed integrally with the nut by injection molding in the return passage of the nut. The above oil-impregnated resin material is obtained by mixing a resin material and lubricating oil in advance and then injection-molding the mixed material. Therefore, when the lubricating oil capacity decreases, the lubricating oil cannot be replenished, and lubrication tends to be poor. In addition, it is necessary to injection-mold the oil-containing resin material integrally with the nut, and there is a problem that the manufacturing cost is increased due to the time required. In addition, the rolling guide unit achieves lubrication maintenance-free by providing an oil supply member on the direction changing path of the end cap of the ball spline and an oil impregnation member on the outer cylinder, but the oil impregnation member is incorporated in the assembly hole. Therefore, the supply of lubricating oil from the oil-impregnated member to the oil supply member was not sufficient and had a problem.

この発明の目的は，上記の課題を解決することであり，精密位置決めテーブル等のメカトロ製品，検査装置等の各種の機器に組み込んで適用でき，インサイドリターンプレートで成るエンドキャップの外側端面に凹部を形成し，該凹部に潤滑剤を含浸し補給できる含油部材を配設し，装置自体を小型で簡素に構成すると共に，エンドキャップの方向転換路に開口する連通孔に油供給部材を嵌入し，含油部材と油供給部材とを潤滑剤を含浸した多孔質焼結樹脂で構成し，含油部材から油供給部材に潤滑剤を常時補給し，方向転換路を転走する転動体のボールに油供給部材の露出面を接触させて潤滑剤を確実に適正に供給して潤滑のメンテナンスフリーを達成したことを特徴とするボールねじを提供することである。   An object of the present invention is to solve the above-described problems, and can be applied by being incorporated in various devices such as mechatronic products such as precision positioning tables and inspection devices, and a recess is formed on the outer end surface of an end cap formed of an inside return plate. An oil-impregnated member that can be formed and impregnated with a lubricant and replenished is disposed, the device itself is small and simple, and an oil supply member is inserted into a communication hole that opens in the direction change path of the end cap. The oil-impregnated member and oil supply member are made of porous sintered resin impregnated with lubricant. The lubricant is constantly supplied from the oil-impregnated member to the oil supply member, and oil is supplied to the balls of the rolling elements rolling on the direction change path. It is an object of the present invention to provide a ball screw characterized in that the maintenance surface of lubrication is achieved by bringing the exposed surface of a member into contact with each other and reliably supplying a lubricant properly.

この発明は，複数の転動体であるボールが転動する第１螺旋溝が外周面に軸方向螺旋状に形成された回転可能なねじ軸，及び前記ねじ軸の前記外周面に嵌合し且つ前記第１螺旋溝に対向して前記ボールが転動する第２螺旋溝が内周面に軸方向螺旋状に形成された筒状のナットを有し，前記ナットが前記ねじ軸の回転に対応して前記ねじ軸上を長手方向に移動することから成るボールねじにおいて，
前記ナットは，前記第２螺旋溝と前記ボールが転走する前記長手方向に延びるリターン路とが形成された筒状のナット本体，前記ナット本体の両端部にそれぞれ配設され且つ前記第１螺旋溝と前記第２螺旋溝とで形成される螺旋状軌道路と前記リターン路とを連通する方向転換路が形成されたエンドキャップ，前記エンドキャップの外側端面に配設された潤滑剤が含浸された含油部材，及び前記エンドキャップに形成され且つ前記方向転換路と前記含油部材側の前記エンドキャップの前記外側端面とを連通する連通孔に配設された油供給部材から構成され，前記油供給部材の前記含油部材側の一方の端面には前記含油部材に圧接する弾性的な凸部が一体的に設けられており，
前記油供給部材の他方の端面は前記方向転換路を転走する前記ボールに接触して前記潤滑剤を前記ボールに供給し，前記油供給部材の前記凸部が前記含油部材に圧接して前記潤滑剤が前記油供給部材に補給されることを特徴とするボールねじに関する。 The present invention includes a rotatable screw shaft in which a first spiral groove on which a ball as a plurality of rolling elements rolls is formed in an axial spiral shape on an outer peripheral surface, and a fitting to the outer peripheral surface of the screw shaft; The second spiral groove on which the ball rolls facing the first spiral groove has a cylindrical nut formed in an axial spiral on the inner peripheral surface, and the nut corresponds to the rotation of the screw shaft. In a ball screw consisting of moving in the longitudinal direction on the screw shaft,
Wherein the nut, the second helical groove and the said longitudinally extending return passage and is formed cylindrical nut body which balls are rolling, are disposed at both ends of the nut body and the first helical An end cap formed with a direction change path that connects the spiral track formed by the groove and the second spiral groove and the return path, and a lubricant disposed on the outer end surface of the end cap are impregnated. The oil supply member, and an oil supply member formed in the end cap and disposed in a communication hole that communicates the direction changing path and the outer end surface of the end cap on the oil containing member side. One end face of the member on the oil-impregnated member side is integrally provided with an elastic convex portion that presses against the oil-impregnated member,
The end surface of the other side of the oil supply member supplies the lubricant in contact with the ball rolling the turnaround passage to the ball, the convex portion of the oil supply member is in contact pressure to the oil-impregnated member The lubricant is supplied to the oil supply member.

このボールねじは，前記ナットには前記含油部材の外面を覆うためのキャップが設けられており，前記キャップは前記エンドキャップと前記含油部材を介在して前記ナット本体に固定されているものである。また，前記ナット本体には，相手部材を取り付けるための取付け用孔が形成されたフランジ部を備えているものである。   In this ball screw, the nut is provided with a cap for covering the outer surface of the oil-containing member, and the cap is fixed to the nut body with the end cap and the oil-containing member interposed therebetween. . Further, the nut body is provided with a flange portion in which a mounting hole for mounting a mating member is formed.

また，前記含油部材は，前記エンドキャップの前記外側端面に配設された前記キャップ内に収容されており，前記キャップに設けたシール用凸部に方向を合わせるため，Ｃ形リング状に形成されている。このボールねじは，前記ねじ軸の回転に応答して，前記ボールが前記螺旋状軌道路，前記リターン路及び前記方向転換路から成る循環路を転走し，前記ナットが前記ねじ軸上を前記ボールを介して前記長手方向に相対的に移動するものである。 The oil-impregnated member is accommodated in the cap disposed on the outer end surface of the end cap, and is formed in a C-shaped ring shape in order to align the direction with the sealing convex portion provided on the cap. ing. In this ball screw, in response to the rotation of the screw shaft, the ball rolls on a circulation path composed of the spiral track, the return path, and the direction changing path, and the nut moves on the screw shaft. it is intended to move relatively in the longitudinal direction through the ball.

また，前記ねじ軸は，両端部が回転可能に支持された丸軸タイプのボールねじ軸である。また，前記エンドキャップに形成された前記連通孔は，前記方向転換路のＲ状に曲がった外側壁面に開口しており，前記方向転換路に露出する前記油供給部材の前記他方の端面は，前記Ｒ状に曲がった前記外側壁面と同様な前記Ｒ状に曲がった形状に形成されている。 The screw shaft is a round shaft type ball screw shaft whose both ends are rotatably supported. Further, the communication hole formed in the end cap opens to an outer wall surface curved in an R shape of the direction change path, and the other end surface of the oil supply member exposed to the direction change path is: The outer wall surface bent in the R shape is formed in the shape bent in the R shape similar to the outer wall surface.

また，前記油供給部材の前記方向転換路に露出する前記端面の幅は，前記ボールの径の実質的に１／４〜１／２の範囲に設定して形成されている。また，前記エンドキャップは，前記螺旋状軌道路と前記リターン路とを連通する前記方向転換路が形成された凸部と前記螺旋状軌道路側の前記ボールをすくうためのすくい爪とが形成されたインサイドリターンプレートであり，前記インサイドリターンプレートの前記凸部が前記ナット本体のそれぞれの端部に形成された前記第２螺旋溝のそれぞれの端部と連通する凹部に嵌合している。 In addition, the width of the end surface exposed to the direction change path of the oil supply member is formed to be substantially in a range of 1/4 to 1/2 of the diameter of the ball. Further, the end cap is formed with a convex portion formed with the direction changing path communicating the spiral path and the return path, and a rake claw for scooping the ball on the spiral path side. It is an inside return plate, The said convex part of the said inside return plate is fitted in the recessed part connected with each edge part of the said 2nd spiral groove formed in each edge part of the said nut main body.

更に，前記含油部材及び前記油供給部材は，ポリエチレン又はポリプロピレンの合成樹脂微粒子を押し固めて加熱成形し且つ前記合成樹脂微粒子間が連通状態に保形された多孔部を備えた多孔質成形体で形成し，前記多孔部に前記潤滑剤が含浸されているものである。   Further, the oil-containing member and the oil supply member are a porous molded body having a porous portion in which synthetic resin fine particles of polyethylene or polypropylene are pressed and heat-molded and the synthetic resin fine particles are kept in communication with each other. The porous part is formed and impregnated with the lubricant.

この発明によるボールねじは，上記のように構成されており，装置自体を簡素な小型に構成し，エンドキャップの外側端面に設けられたキャップの凹部に配設した含油部材には潤滑剤を多量に含浸させることができ，エンドキャップの連通孔に配設した油供給部材の凸部を含油部材に圧接させ，それにより潤滑剤が毛細管現象等で確実にスムーズに前記含油部材から前記油供給部へ移動できるように構成し，含油部材に含浸された潤滑剤を油供給部材にスムーズに補給させ，方向転換路を転走するボールが油供給部材の露出端面に接することによって，油供給部材から容易に潤滑剤が滲み出てボールに潤滑剤が供給され，ボールねじの潤滑メンテナンスフリーを実現することができる。また，このボールねじは，キャップの凹部に配設される含油部材がＣ形リングに形成されている。また，キャップの内周側には，ねじ軸の螺旋溝に合せてシール用凸部を設けており，該シール用凸部によって異物の侵入を防止することができる。また，含油部材は外側がキャップで覆われているので，潤滑剤が飛散して周囲環境を悪化させることが無いものである。 The ball screw according to the present invention is configured as described above, and the apparatus itself is configured to be simple and small, and a large amount of lubricant is added to the oil-impregnated member disposed in the concave portion of the cap provided on the outer end surface of the end cap. The projecting portion of the oil supply member disposed in the communication hole of the end cap is brought into pressure contact with the oil-impregnated member, so that the lubricant can be surely and smoothly transferred from the oil-impregnated member to the oil-supplied portion by capillary action or the like The oil supply member is smoothly replenished with the lubricant impregnated in the oil-impregnated member, and the ball rolling on the direction change path contacts the exposed end surface of the oil supply member. Lubricant easily oozes out and is supplied to the ball, making it possible to achieve lubrication-free maintenance of the ball screw. Further, in this ball screw, an oil-containing member disposed in a concave portion of the cap is formed in a C-shaped ring. Further, a sealing convex portion is provided on the inner peripheral side of the cap in accordance with the spiral groove of the screw shaft, and entry of foreign matter can be prevented by the sealing convex portion. Moreover, since the oil-impregnated member is covered with a cap, the lubricant does not scatter and does not deteriorate the surrounding environment.

この発明によるボールねじの一実施例をを示す斜視図である。It is a perspective view which shows one Example of the ball screw by this invention. 図１のボールねじを構成するナットを示す分解斜視図である。It is a disassembled perspective view which shows the nut which comprises the ball screw of FIG. 図１のボールねじの一部を破断してボールが転走する循環路の一部を示す側面図である。FIG. 2 is a side view showing a part of a circulation path in which a part of the ball screw in FIG. 1 is broken and the ball rolls. 図３のボールねじを構成するエンドキャップの外側端面を示す正面図である。It is a front view which shows the outer side end surface of the end cap which comprises the ball screw of FIG. 図４のボールねじを構成するエンドキャップのＡ−Ａ位置における断面図である。It is sectional drawing in the AA position of the end cap which comprises the ball screw of FIG. 図４のエンドキャップの内側端面を示す背面図である。It is a rear view which shows the inner side end surface of the end cap of FIG. 図１のボールねじを構成する油供給部材を示し，（Ａ）は側面図であり，（Ｂ）は上面図である。The oil supply member which comprises the ball screw of FIG. 1 is shown, (A) is a side view, (B) is a top view. 図１のボールねじを構成する含油部材を示し，（Ａ）は正面図であり，（Ｂ）は側面図である。The oil impregnation member which comprises the ball screw of FIG. 1 is shown, (A) is a front view, (B) is a side view. 図１のボールねじを構成するキャップを示しており，（Ａ）は外側端面を示す正面図，（Ｂ）は（Ａ）におけるＢ−Ｂ位置を示す断面図，（Ｃ）は内側端面を示す背面図，及び（Ｄ）は側面図である。Shows a cap constituting a ball screw of Fig. 1, (A) is a positive plane view showing an outer side end surface, (B) is a sectional view showing a B-B position in (A), (C) the inner side rear view of the end face, and (D) is a side view.

以下，図面を参照して，この発明によるボールねじの一実施例を説明する。この発明によるボールねじは，図１〜図３に示すように，複数の転動体であるボール９が転動する螺旋溝１１（第１螺旋溝）が外周面１０に軸方向に形成された回転可能なボールねじ軸であるねじ軸１，及びねじ軸１の外周面１０に嵌合し且つ螺旋溝１１に対向してボール９が転動する螺旋溝１２（第２螺旋溝）が内周面１７に軸方向に形成された筒状のナット２から構成されており，ねじ軸１の回転に対応してナット２がねじ軸１上を長手方向に相対移動するものである。   Hereinafter, an embodiment of a ball screw according to the present invention will be described with reference to the drawings. In the ball screw according to the present invention, as shown in FIGS. 1 to 3, a spiral groove 11 (first spiral groove) on which a ball 9 as a plurality of rolling elements rolls is formed in the outer peripheral surface 10 in the axial direction. A spiral groove 12 (second spiral groove) that fits the screw shaft 1, which is a possible ball screw shaft, and the outer peripheral surface 10 of the screw shaft 1 and the ball 9 rolls against the spiral groove 11 is an inner peripheral surface. 17 includes a cylindrical nut 2 formed in the axial direction, and the nut 2 relatively moves in the longitudinal direction on the screw shaft 1 in response to the rotation of the screw shaft 1.

このボールねじにおいて，特に，ナット２は，螺旋溝１２と，ボール９が転走する長手方向に延びるリターン路１３とが形成された筒状のナット本体３，ナット本体３の両端面４７にそれぞれ配設され且つ螺旋溝１１と螺旋溝１２とで形成される螺旋状軌道路１５とリターン路１３とを連通する方向転換路１４が形成されたエンドキャップ４，エンドキャップ４の外側端面１９に配設された潤滑剤が含浸された含油部材５，及びエンドキャップ４に形成され且つ方向転換路１４と含油部材５側のエンドキャップ４の外側端面１９とを連通する連通孔２０に配設された油供給部材６から構成されていることを特徴としている。このボールねじは，ナット２には含油部材５の外面２４を覆うためのキャップ７が設けられている。キャップ７は，エンドキャップ４と含油部材５を介在してナット本体３に固定ねじ３１によって固定されている。ナット本体３には，その端面４７に複数箇所の取付け用ねじ穴４６が形成されている。固定ねじ３１は，キャップ７のザグリ取付け用孔４１，含油部材５の凹部３６及びエンドキャップ４の取付け用孔４３を挿通してナット本体３の取付け用ねじ穴４６に螺入し，ナット本体３にエンドキャップ４，含油部材５及びキャップ７が固定される。   In this ball screw, in particular, the nut 2 is respectively formed on a cylindrical nut body 3 formed with a spiral groove 12 and a return path 13 extending in the longitudinal direction along which the ball 9 rolls, on both end faces 47 of the nut body 3. The end cap 4 is formed on the outer end surface 19 of the end cap 4 and the end cap 4 formed with the direction change path 14 that communicates the spiral path 15 formed by the spiral groove 11 and the spiral groove 12 and the return path 13. The oil-impregnated member 5 impregnated with the provided lubricant and the end cap 4 are formed in a communication hole 20 that communicates the direction change path 14 and the outer end surface 19 of the end cap 4 on the oil-impregnated member 5 side. It is characterized by comprising an oil supply member 6. In this ball screw, the nut 2 is provided with a cap 7 for covering the outer surface 24 of the oil retaining member 5. The cap 7 is fixed to the nut body 3 by a fixing screw 31 with the end cap 4 and the oil impregnated member 5 interposed therebetween. A plurality of mounting screw holes 46 are formed in the end surface 47 of the nut body 3. The fixing screw 31 is inserted into the counterbore mounting hole 41 of the cap 7, the recess 36 of the oil retaining member 5, and the mounting hole 43 of the end cap 4 and screwed into the mounting screw hole 46 of the nut body 3. The end cap 4, the oil-impregnated member 5 and the cap 7 are fixed to each other.

このボールねじは，ねじ軸１がナット２を嵌挿しており，ねじ軸１がナット２を嵌挿するため，ナット２を構成するナット本体３には嵌挿孔３３，エンドキャップ４には嵌挿孔３４，含油部材５には嵌挿孔３５，及びキャップ７には嵌挿孔３７がそれぞれ対向整合して形成されている。また，含油部材５は，エンドキャップ４の外側端面１９に配設されたキャップ７内に収容されており，キャップ７に設けたシール用凸部５０に方向を合わせるためＣ形リング状の一部が切欠き部３２に形成されている。シール用凸部５０は，ねじ軸１の螺旋溝１１に合せて設けられている，シール用凸部５０は，ねじ軸１とナット２との隙間を小さくし，一種のラビリンスシールとして機能し，異物が侵入するのを防止することができる。キャップ７と含油部材との組み付け時には，キャップ７のシール用凸部５０と含油部材５の切欠き部３２を合せて取り付けられる。含油部材５は，その外周面に固定ねじ３１が挿通する凹部３６が形成されている。キャップ７は，中央にねじ軸１が嵌挿する嵌挿孔３７に，外側が含油部材５を覆う端面３８に，周囲がリング状の外周面３９に形成されており，外周面３９の内側に含油部材５を収容する凹部４０が形成されている。また，キャップ７には，固定ねじ３１を挿通するためのザグリ取付け用孔４１が複数箇所（図９では４箇所）設けられている。含油部材５は，キャップ７の凹部４０に収容され，外側が覆われた状態で組み込まれる。 In this ball screw, since the screw shaft 1 is fitted with the nut 2 and the screw shaft 1 is fitted with the nut 2, the nut body 3 constituting the nut 2 is fitted into the fitting hole 33 and the end cap 4. An insertion hole 35 is formed in the insertion hole 34, the oil retaining member 5, and an insertion hole 37 is formed in the cap 7 so as to face each other. The oil-impregnated member 5 is accommodated in a cap 7 disposed on the outer end surface 19 of the end cap 4, and a part of a C-shaped ring shape is used to align the direction with a seal projection 50 provided on the cap 7. Is formed in the notch 32. The sealing convex portion 50 is provided in accordance with the spiral groove 11 of the screw shaft 1. The sealing convex portion 50 reduces the gap between the screw shaft 1 and the nut 2 and functions as a kind of labyrinth seal. It is possible to prevent foreign matter from entering. When the cap 7 and the oil-impregnated member are assembled, the sealing convex portion 50 of the cap 7 and the notch 32 of the oil-impregnated member 5 are attached together. The oil-impregnated member 5 has a recess 36 formed in the outer peripheral surface thereof through which the fixing screw 31 is inserted. The cap 7 is formed at the center in a fitting hole 37 into which the screw shaft 1 is fitted, the outer side is formed on an end surface 38 that covers the oil-impregnated member 5, and the periphery is formed on a ring-shaped outer circumferential surface 39. A recess 40 for accommodating the oil-containing member 5 is formed. Further, the cap 7 is provided with a plurality of counterbore mounting holes 41 (four in FIG. 9) through which the fixing screw 31 is inserted. The oil-impregnated member 5 is accommodated in the recess 40 of the cap 7 and is incorporated with its outer side covered.

このボールねじにおいて，ねじ軸１は，両端部２６が回転可能に支持された丸軸タイプのボールねじ軸に構成されている。また，ナット本体３には，ワーク，工具，機器等の相手部材を取り付けるため一方の端部１８に取付け用孔２５が形成されたフランジ部８を備えている。エンドキャップ４は，一種のインサイドリターンプレートを構成する凸部３０には，ねじ軸１側の螺旋溝１１を転動してくるボール９をすくうためのすくい爪２９と，ボール９を方向転換させる方向転換路１４と，方向転換路１４からリターン路１３へボール９を案内するための出入口である口元部とが形成されている。エンドキャップ４は，その凸部３０がナット本体３の両端部１８に形成された嵌合穴である凹部２８に嵌入しており，エンドキャップ４に形成された方向転換路１４は，ナット本体３に形成された螺旋溝１２に連通している。 In this ball screw, the screw shaft 1 is configured as a round shaft type ball screw shaft in which both end portions 26 are rotatably supported. Further, the nut body 3 is provided with a flange portion 8 in which a mounting hole 25 is formed at one end portion 18 for attaching a mating member such as a work, a tool, or an equipment. The end cap 4 has a convex portion 30 constituting a kind of inside return plate, a rake claw 29 for scooping the ball 9 rolling on the spiral groove 11 on the screw shaft 1 side, and a direction change of the ball 9. A direction changing path 14 and a mouth portion that is an entrance for guiding the ball 9 from the direction changing path 14 to the return path 13 are formed. The end cap 4, the convex portion 30 is fitted into the concave portion 28 is a fitting hole formed at both end portions 18 of the nut main body 3, the direction changing passage 14 formed in the end cap 4, the nut body 3 communicates with the spiral groove 12 formed in the groove 3.

このボールねじでは，ボール９の循環路１６は，ボール９がねじ軸１の螺旋溝１１とナット本体３の螺旋溝１２とが対向して構成される螺旋状軌道路１５，ナット本体３に形成されたリターン路１３，及び一対のエンドキャップ４にそれぞれ形成された方向転換路１４から構成されている。このボールねじは，概して，ねじ軸１の回転に応答してボール９が循環路１６を転走し，ナット２がねじ軸１上をボール９を介して長手方向に相対的に移動するものである。   In this ball screw, the circulation path 16 of the ball 9 is formed in a spiral raceway 15 and a nut body 3 in which the ball 9 is configured such that the spiral groove 11 of the screw shaft 1 and the spiral groove 12 of the nut body 3 face each other. The return path 13 and the direction change paths 14 respectively formed in the pair of end caps 4 are configured. In general, the ball screw is configured such that the ball 9 rolls in the circulation path 16 in response to the rotation of the screw shaft 1, and the nut 2 moves relatively on the screw shaft 1 in the longitudinal direction via the ball 9. is there.

このボールねじは，エンドキャップ４の外側に配設された含油部材５から油供給部材６を通して方向転換路１４を転走するボール９に潤滑剤を供給するものである。エンドキャップ４に凸部３０が形成された端面４２とは反対側の外側端面１９（図２）に含油部材５が配設されている。エンドキャップ４に形成された連通孔２０は，一端が方向転換路１４のＲ状に曲がった外側壁面２７の長方形の開口部４４で開口し，他端がエンドキャップ４の外側端面１９に開口している。エンドキャップ４に形成された連通孔２０には，油供給部材６が嵌入しており，方向転換路１４に露出する油供給部材６の端面２１は，方向転換路１４の外側壁面２７に対応して同じＲ状に曲がった形状に形成されている。特に，油供給部材６の含油部材５側の端面２２には潤滑剤が確実に供給されるように含油部材５の内側端面４５に圧接する弾性的な凸部２３が一体的に設けられている。このボールねじは，油供給部材６の一端側の凸部２３が含油部材５のエンドキャップ４側の端面４５に当接して配設されているので，固定ねじ３１がナット本体３の取付け用ねじ穴４６に螺入することによって，凸部２３が圧接させた状態になって，ナット本体３にエンドキャップ４，油供給部材６，含油部材５及びキャップ７が固定される。油供給部材６の凸部２３が含油部材５の端面４５に圧接状態に取り付けられることによって，含油部材５に含浸された潤滑剤が油供給部材６にスムーズに移動することができ，含油部材５に含浸された潤滑剤を油供給部材６に確実にスムーズに補給されることになる。また，油供給部材６の一方の端面２１は，方向転換路１４を転走するボール９に接触して潤滑剤をボール９に供給し，油供給部材６の他方の端面２２は，含油部材５に圧接して潤滑剤が油供給部材６に補給されるように構成されている。また，油供給部材６は，平板状であって，方向転換路１４に露出する端面２１は，実質的に長方形で長手方向に伸びるＲ状の円弧面に形成されており，油供給部材６の端面２１の幅は，ボール９の径の実質的に１／４〜１／２の範囲に設定して形成されており，油供給部材６からボール９に適量の潤滑剤が供給されるように構成されている。 This ball screw supplies lubricant from the oil retaining member 5 disposed outside the end cap 4 to the ball 9 rolling on the direction change path 14 through the oil supply member 6. The oil-impregnated member 5 is disposed on the outer end surface 19 (FIG. 2) opposite to the end surface 42 on which the convex portion 30 is formed on the end cap 4. One end of the communication hole 20 formed in the end cap 4 opens at the rectangular opening 44 of the outer wall surface 27 bent in the R shape of the direction change path 14, and the other end opens at the outer end surface 19 of the end cap 4. ing. The oil supply member 6 is fitted into the communication hole 20 formed in the end cap 4, and the end surface 21 of the oil supply member 6 exposed to the direction change path 14 corresponds to the outer wall surface 27 of the direction change path 14. Are formed in the same curved shape. In particular, the end surface 22 of the oil supply member 6 on the oil retaining member 5 side is integrally provided with an elastic convex portion 23 that presses against the inner end surface 45 of the oil retaining member 5 so that the lubricant is reliably supplied. . In this ball screw, since the convex portion 23 on one end side of the oil supply member 6 is disposed in contact with the end face 45 on the end cap 4 side of the oil-containing member 5, the fixing screw 31 is a mounting screw for the nut body 3. By screwing into the hole 46, the convex portion 23 is brought into pressure contact, and the end cap 4, the oil supply member 6, the oil-containing member 5, and the cap 7 are fixed to the nut body 3. By attaching the convex portion 23 of the oil supply member 6 to the end face 45 of the oil-containing member 5 in a pressure contact state, the lubricant impregnated in the oil-containing member 5 can smoothly move to the oil supply member 6. The oil impregnated in the oil supply member 6 is surely and smoothly supplied. One end surface 21 of the oil supply member 6 contacts the ball 9 rolling on the direction change path 14 to supply the lubricant to the ball 9, and the other end surface 22 of the oil supply member 6 is connected to the oil-containing member 5. lubricant is configured to be supplied to the oil supply member 6 in contact pressure. The oil supply member 6 has a flat plate shape, and the end surface 21 exposed to the direction changing path 14 is formed in an R-shaped arc surface that is substantially rectangular and extends in the longitudinal direction. The width of the end face 21 is formed so as to be substantially within a range of 1/4 to 1/2 of the diameter of the ball 9 so that an appropriate amount of lubricant is supplied to the ball 9 from the oil supply member 6. It is configured.

このボールねじにおいて，含油部材５及び油供給部材６は，ポリエチレン又はポリプロピレンの合成樹脂微粒子を押し固めて加熱成形し且つ前記合成樹脂微粒子間が連通状態に保形された多孔部を備えた多孔質成形体で形成し，前記多孔部に前記潤滑剤が含浸されている。従って，このボールねじは，油供給部材６が方向転換路１４に露出しているので，方向転換路１４を転走するボール９は，油供給部材６の端面２１に接触し，含油部材５及び油供給部６に含浸されている潤滑剤がボール９に供給され，潤滑のメンテナンスフリーを達成することができる。また，このボールねじについて，ボールねじ仕様は，例えば，ねじ軸１の軸径がφ１５に形成され，ねじ軸１の外周面１０に形成された螺旋溝１１は一条列に形成され，リードは３０ｍｍに形成することができる。 In this ball screw, the oil-impregnated member 5 and the oil supply member 6 have a porous portion having a porous portion in which synthetic resin fine particles of polyethylene or polypropylene are pressed and heat-molded and the synthetic resin fine particles are kept in communication with each other. The molded body is formed and the porous portion is impregnated with the lubricant. Accordingly, since the oil supply member 6 is exposed to the direction change path 14 in this ball screw, the ball 9 rolling on the direction change path 14 comes into contact with the end face 21 of the oil supply member 6 and the oil retaining member 5 and Lubricant impregnated in the oil supply unit 6 is supplied to the balls 9 and lubrication maintenance-free can be achieved. The ball screw specifications of this ball screw are, for example, such that the shaft diameter of the screw shaft 1 is formed to φ15, the spiral groove 11 formed on the outer peripheral surface 10 of the screw shaft 1 is formed in a single row, and the lead is 30 mm .

この発明によるボールねじは，精密位置決めテーブル等のメカトロ製品，検査装置等の各種機器に適用して好ましいものである。   The ball screw according to the present invention is preferably applied to various devices such as mechatronic products such as precision positioning tables and inspection devices.

１ ねじ軸
２ ナット
３ ナット本体
４ エンドキャップ
５ 含油部材
６ 油供給部材
７ キャップ
８ フランジ部
９ ボール（転動体）
１０，３９ 外周面
１１ 螺旋溝（第１螺旋溝）
１２ 螺旋溝（第２螺旋溝）
１３ リターン路
１４ 方向転換路
１５ 螺旋状軌道路
１６ 循環路
１７ 内周面
１８，２６ 端部
１９ 外側端面
２０ 連通孔
２１，２２，３８ 端面
２３，３０ 凸部
２４ 外面
２５ 取付け用孔
２７ 外側壁面
２８ 凹部
３２ 切欠き部 DESCRIPTION OF SYMBOLS 1 Screw shaft 2 Nut 3 Nut main body 4 End cap 5 Oil impregnation member 6 Oil supply member 7 Cap 8 Flange part 9 Ball (rolling element)
10, 39 Outer peripheral surface 11 Spiral groove (first spiral groove)
12 Spiral groove (second spiral groove)
DESCRIPTION OF SYMBOLS 13 Return path 14 Direction change path 15 Spiral track 16 Circulation path 17 Inner peripheral surface 18,26 End part 19 Outer end surface 20 Communication hole 21,22,38 End surface 23,30 Convex part 24 Outer surface 25 Mounting hole 27 Outer wall surface 28 Recess 32 Notch

Claims (10)

複数の転動体であるボールが転動する第１螺旋溝が外周面に軸方向に形成された回転可能なねじ軸，及び前記ねじ軸の前記外周面に嵌合し且つ前記第１螺旋溝に対向して前記ボールが転動する第２螺旋溝が内周面に軸方向に形成された筒状のナットを有し，前記ナットが前記ねじ軸の回転に対応して前記ねじ軸上を長手方向に移動することから成るボールねじにおいて，
前記ナットは，前記第２螺旋溝と前記ボールが転走する長手方向に延びるリターン路とが形成された筒状のナット本体，前記ナット本体の両端部にそれぞれ配設され且つ前記第１螺旋溝と前記第２螺旋溝とで形成される螺旋状軌道路と前記リターン路とを連通する方向転換路が形成されたエンドキャップ，前記エンドキャップの外側端面に配設された潤滑剤が含浸された含油部材，及び前記エンドキャップに形成され且つ前記方向転換路と前記含油部材側の前記エンドキャップの前記外側端面とを連通する連通孔に配設された油供給部材から構成され，前記油供給部材の前記含油部材側の前記端面には前記含油部材に圧接する弾性的な凸部が一体的に設けられており，
前記油供給部材の一方の端面は前記方向転換路を転走する前記ボールに接触して前記潤滑剤を前記ボールに供給し，前記油供給部材の他方の端面は前記含油部材に当接して前記潤滑剤が前記油供給部材に補給されることを特徴とするボールねじ。 A first spiral groove in which a ball as a plurality of rolling elements rolls is formed on an outer peripheral surface in the axial direction, and a rotatable screw shaft is fitted to the outer peripheral surface of the screw shaft and is formed in the first spiral groove. A second spiral groove on which the ball rolls oppositely has a cylindrical nut formed on the inner peripheral surface in the axial direction, and the nut extends longitudinally on the screw shaft in response to the rotation of the screw shaft. In a ball screw consisting of moving in the direction
The nut is provided in a cylindrical nut body in which the second spiral groove and a return path extending in the longitudinal direction in which the ball rolls are formed, respectively, on both ends of the nut body, and the first spiral groove And an end cap formed with a direction change path that connects the spiral track formed by the second spiral groove and the return path, and a lubricant disposed on the outer end surface of the end cap was impregnated. The oil supply member includes an oil impregnation member, and an oil supply member formed in the end cap and disposed in a communication hole that communicates the direction change path and the outer end surface of the end cap on the oil impregnation member side. An elastic convex portion that is pressed against the oil-impregnated member is integrally provided on the end surface of the oil-impregnated member.
One end surface of the oil supply member contacts the ball rolling on the direction change path to supply the lubricant to the ball, and the other end surface of the oil supply member contacts the oil-containing member and A ball screw characterized in that a lubricant is supplied to the oil supply member. 前記ナットには前記含油部材の外面を覆うためのキャップが設けられており，前記キャップは前記エンドキャップと前記含油部材を介在して前記ナット本体に固定されていることを特徴とする請求項１に記載のボールねじ。   2. The nut is provided with a cap for covering an outer surface of the oil-containing member, and the cap is fixed to the nut body with the end cap and the oil-containing member interposed therebetween. Ball screw as described in. 前記ナット本体には，相手部材を取り付けるための取付け用孔が形成されたフランジ部を備えていることを特徴とする請求項１又は２に記載のボールねじ。   The ball screw according to claim 1, wherein the nut body includes a flange portion in which a mounting hole for mounting a mating member is formed. 前記含油部材は，前記エンドキャップの前記外側端面に配設された前記キャップ内に収容されており，前記キャップに設けたシール用凸部に方向を合わせるためＣ形リング状に形成されていることを特徴とする請求項２又は３に記載のボールねじ。   The oil-impregnated member is accommodated in the cap disposed on the outer end face of the end cap, and is formed in a C-shaped ring shape in order to align the direction with the sealing convex portion provided on the cap. The ball screw according to claim 2 or 3, wherein 前記ねじ軸の回転に応答して，前記ボールは，前記螺旋状軌道路，前記リターン路及び前記方向転換路から成る循環路を転走し，前記ナットが前記ねじ軸上を前記ボールを介して長手方向に相対的に移動することを特徴とする請求項１〜４のいずれか１項に記載のボールねじ。   In response to the rotation of the screw shaft, the ball rolls on a circulation path composed of the spiral track, the return path, and the direction changing path, and the nut is moved on the screw shaft via the ball. The ball screw according to any one of claims 1 to 4, wherein the ball screw moves relatively in a longitudinal direction. 前記ねじ軸は，両端部が回転可能に支持された丸軸タイプのボールねじ軸であることを特徴とする請求項１〜５のいずれか１項に記載のボールねじ。   The ball screw according to any one of claims 1 to 5, wherein the screw shaft is a round shaft type ball screw shaft whose both ends are rotatably supported. 前記エンドキャップに形成された前記連通孔は，前記方向転換路のＲ状に曲がった外側壁面に開口しており，前記方向転換路に露出する前記油供給部材の端面は，前記Ｒ状に曲がった前記外側壁面と同じＲ状に曲がった形状に形成されていることを特徴とする請求項１〜６のいずれか１項に記載のボールねじ。   The communication hole formed in the end cap opens to the outer wall surface curved in the R shape of the direction change path, and the end surface of the oil supply member exposed in the direction change path is bent in the R shape. The ball screw according to claim 1, wherein the ball screw is formed in the same curved shape as the outer wall surface. 前記油供給部材の前記方向転換路に露出する前記端面の幅は，前記ボールの径の実質的に１／４〜１／２の範囲に設定して形成されていることを特徴とする請求項１〜７のいずれか１項に記載のボールねじ。   The width of the end surface exposed to the direction change path of the oil supply member is formed to be substantially set to a range of 1/4 to 1/2 of the diameter of the ball. The ball screw according to any one of 1 to 7. 前記エンドキャップは，前記螺旋状軌道路と前記リターン路とを連通する前記方向転換路が形成された凸部と前記螺旋状軌道路側の前記ボールをすくうためのすくい爪とが形成されたインサイドリターンプレートであり，前記インサイドリターンプレートの前記凸部が前記ナット本体の端部に形成された前記第２螺旋溝の端部と連通する凹部に嵌合していることを特徴とする請求項１〜８のいずれか１項にボールねじ。   The end cap includes an inside return formed with a convex portion formed with the direction changing path communicating the helical track and the return path, and a rake claw for scooping the ball on the spiral track side. It is a plate, The said convex part of the said inside return plate is fitted in the recessed part connected with the edge part of the said 2nd spiral groove formed in the edge part of the said nut main body, The 1st characterized by the above-mentioned. The ball screw as described in any one of 8 above. 前記含油部材及び前記油供給部材は，ポリエチレン又はポリプロピレンの合成樹脂微粒子を押し固めて加熱成形し且つ前記合成樹脂微粒子間が連通状態に保形された多孔部を備えた多孔質成形体で形成し，前記多孔部に前記潤滑剤が含浸されていることを特徴とする請求項１〜９のいずれか１項に記載のボールねじ。   The oil-containing member and the oil supply member are formed of a porous molded body having a porous portion in which synthetic resin fine particles of polyethylene or polypropylene are pressed and heat-molded and the synthetic resin fine particles are kept in communication with each other. The ball screw according to any one of claims 1 to 9, wherein the porous portion is impregnated with the lubricant.
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