JPH02163550A - Ball screw - Google Patents
Ball screwInfo
- Publication number
- JPH02163550A JPH02163550A JP31698488A JP31698488A JPH02163550A JP H02163550 A JPH02163550 A JP H02163550A JP 31698488 A JP31698488 A JP 31698488A JP 31698488 A JP31698488 A JP 31698488A JP H02163550 A JPH02163550 A JP H02163550A
- Authority
- JP
- Japan
- Prior art keywords
- balls
- ball
- self
- vacuum
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 125000006850 spacer group Chemical group 0.000 abstract description 14
- 239000000314 lubricant Substances 0.000 abstract description 9
- 239000007787 solid Substances 0.000 abstract description 5
- 150000002739 metals Chemical class 0.000 abstract description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052737 gold Inorganic materials 0.000 abstract description 2
- 239000010931 gold Substances 0.000 abstract description 2
- 239000011133 lead Substances 0.000 abstract description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052982 molybdenum disulfide Inorganic materials 0.000 abstract description 2
- 229910052709 silver Inorganic materials 0.000 abstract description 2
- 239000004332 silver Substances 0.000 abstract description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 description 7
- 239000004519 grease Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 241001274216 Naso Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Classifications
-
- 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
- F16C33/37—Loose spacing bodies
- F16C33/3713—Loose spacing bodies with other rolling elements serving as spacing bodies, e.g. the spacing bodies are in rolling contact with the load carrying rolling elements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は特に真空中に用いられるホールネジに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a hole screw used particularly in a vacuum.
第５図は従来のボールねじを示す透視図である図におい
て、（１）はねじＩＩＪＩ、（２）はナソｌ−，（３）
はに、を己ねじ軸（１）とナツト（２）のそれぞれのみ
そに接触するボール、（５）は上記ホール（３）を循環
させるリターンチューブである。FIG. 5 is a perspective view showing a conventional ball screw, in which (1) is screw IIJI, (2) is naso l-, (3)
In addition, the ball (5) is a return tube that circulates through the hole (3).
次に動作について説明する。ねじ軸（］）とナツト（２
）のそれぞれのみぞに多数のボール（３）か介在してい
る。ねじ軸（１）を回転させると回転力はボール（３）
がねじ軸（１）のみそを転動しながらナツト（２）に伝
わり、ナツト（２）を直進運動させる。一般にねじとナ
ツトの絹合わせではみぞ部でのすべりによる摩擦抵抗か
大きいが、ボールねじてはボールを介在させみぞ部てこ
ろかぜることによりころがりによる小さな摩擦抵抗を実
現しているのが特徴である。ここで小さな摩擦抵抗を維
持するために油又はグリースによる潤滑を行うことが不
可欠である。無潤滑の場合金属同士の接触となり摩擦抵
抗の増大や焼き付き等をおこすので、寿命や伝達効率か
保証できない。Next, the operation will be explained. Screw shaft (]) and nut (2
) A large number of balls (3) are interposed in each groove. When the screw shaft (1) is rotated, the rotational force is generated by the ball (3)
is transmitted to the nut (2) while rolling on the threaded shaft (1), causing the nut (2) to move in a straight line. Generally, when a screw and a nut are mated together, the frictional resistance due to sliding in the grooves is large, but a ball screw is characterized by the fact that by interposing balls and rolling the grooves, a small frictional resistance due to rolling is achieved. be. Here, it is essential to lubricate with oil or grease in order to maintain a small frictional resistance. Without lubrication, metals come into contact with each other, causing increased frictional resistance and seizure, so we cannot guarantee the lifespan or transmission efficiency.
ねじ軸（１）のみぞをころがりながら進んだボール（３
）はリターンチューブ（５）の中に入り、ちとのみぞま
で戻され、無限に循環を行う。The ball (3) rolled through the groove of the screw shaft (1).
) enters the return tube (5), returns to the groove, and circulates endlessly.
従来のボールねじは以上のように構成されているので、
真空中の様に油やグリースが蒸発してしまう雰囲気下で
は潤滑が行えず使用できないという問題点があった。Conventional ball screws are constructed as described above, so
There was a problem in that it could not be used in an atmosphere where oil or grease would evaporate, such as in a vacuum, because lubrication could not be achieved.
この発明は一上記のような問題点を解消するためになさ
れたもので、真空中で使用できるボールねじを得ること
を目的とする。This invention was made to solve the above-mentioned problems, and its object is to obtain a ball screw that can be used in a vacuum.
この発明に係るボールねじは複数のボールの一部を他の
金属のボールより外径が小さく、かつ自己潤滑性のある
材質で形成したものである。In the ball screw according to the present invention, some of the balls are made of a material that has a smaller outer diameter than other metal balls and is self-lubricating.
〔作用〕
この発明によるボールねじは２外径を小さくし自己潤滑
性材質のボールにより潤滑剤を供給することにより、ね
じ軸とボール、ボールとす、トの間の潤滑状態を維持す
る。[Function] The ball screw according to the present invention maintains a lubricated state between the screw shaft and the ball, and between the ball and the ball by reducing the outer diameter of the ball screw and supplying lubricant by the ball made of a self-lubricating material.
以下この発明の一実施例を図について説明する第１図に
おいて、（１）はねじ軸、（２）はナツト、（３）は上
記ねじ軸（１）とナツト（２）のそれぞれのみぞに接触
する金属で形成されたボール、（４）は上記ポール（３
）よりも外径が小さく材質が異なるスペーサポール、（
５）は上記ボール（３）、スペーサボール（４）を循環
させるリターンチューブである。なお第２図は第１図の
軸断面を示す図である。In FIG. 1, which describes one embodiment of the present invention, (1) is a screw shaft, (2) is a nut, and (3) is a groove in each of the screw shaft (1) and nut (2). The ball (4) made of metal in contact with the above-mentioned pole (3
), a spacer pole with a smaller outer diameter and a different material than (
5) is a return tube that circulates the balls (3) and spacer balls (4). Note that FIG. 2 is a diagram showing an axial cross section of FIG. 1.
次に動作について説明する。ボールねじの基本的な動作
原理としては従来技術の動作と同様である。従来技術と
の相違点は潤滑の方法である。従来、ボールとねじ軸、
ナツトの間の潤滑は油又はグリースにより一様に行って
いた。しかし真空中では油やグリースは蒸発してしまう
ため使用できず、これらにかわるものとして自己潤滑性
の材料をボール、ねじ軸、ナツトの表面にコーティング
することにより潤滑状態を保つ方法かきられていたこの
方法によれば表面の皮膜が存在する間は良好な潤滑が保
たれるが、皮膜かうすいため、長期にわたって良好な潤
滑状態を維持することが難しかった。これを解決するた
め、多数のボールのうちの一部を外径を小さくし直接荷
重を伝えない様にした」〕で、材質を自己潤滑性のある
材料に変更する。このボールがスペーサボール（４）で
あり、ねじ軸（１）、ナツト（２）、ボール（３）に潤
滑剤を供給する役割をはたす。Next, the operation will be explained. The basic operating principle of the ball screw is similar to that of the prior art. The difference from the prior art is the method of lubrication. Traditionally, balls and screw shafts,
Lubrication between the nuts was uniformly performed using oil or grease. However, oil and grease cannot be used in a vacuum because they evaporate, so methods have been developed to maintain lubrication by coating the surfaces of balls, screw shafts, and nuts with self-lubricating materials. According to this method, good lubrication is maintained while the surface film exists, but because the film is thin, it is difficult to maintain good lubrication over a long period of time. To solve this problem, we reduced the outer diameter of some of the many balls so that they no longer directly transmit the load, and changed the material to a self-lubricating material. This ball is a spacer ball (4) and serves to supply lubricant to the screw shaft (1), nut (2), and ball (3).
ここで自己潤滑性のある材料とは二硫化モリブデンに代
表される層状構造物質、金、銀、鉛に代表される軟質金
属及び四フッ化エチレンに代表される高分子材料のこと
をいう。これらの材料を中休又は複合して固体潤滑剤と
して用いられる。真空中において、固体潤滑剤は蒸発し
ないので金属間の摩擦を低減し、摩耗を防ぐのに有利で
ある。Here, the self-lubricating material refers to a layered structure material represented by molybdenum disulfide, a soft metal represented by gold, silver, and lead, and a polymer material represented by tetrafluoroethylene. These materials are used as a solid lubricant either in combination or in combination. Since solid lubricants do not evaporate in a vacuum, they are advantageous in reducing friction between metals and preventing wear.
従って通常の金属ポールの間に自己潤滑性材料のスペー
サボールを入れ、ポール同志が接触した際に固体潤滑剤
が少しずつ供給される様にすれば真空中で長期の寿命が
期待できるボールねじが実現できる。Therefore, by inserting a spacer ball made of self-lubricating material between ordinary metal poles so that solid lubricant is gradually supplied when the poles come into contact, a ball screw that can be expected to have a long life in a vacuum can be created. realizable.
なお、上記実施例では、ボール（３）とスペーサボ一部
（４）の組合わせ比率については特定していないものに
ついて説明したが、下記に示す組合わせにより使用用途
に応じたボールねじが得られる。In addition, in the above example, the combination ratio of the ball (3) and the spacer sabot part (4) is not specified, but a ball screw suitable for the intended use can be obtained by the combination shown below. .
藝
自己潤滑性材質の外径の小さいボール（スペーサボール
）と金属材質のボールとの組合わせ比率をｍｌにし交互
に配置する。The combination ratio of balls (spacer balls) made of a self-lubricating material with a small outer diameter and balls made of a metal material is set to ml, and they are arranged alternately.
上記例について第３図に示す。図に示す様に荷重の負担
は金属ボールでなされるため、全てが金属ボールの場合
に較べ荷重負担能力は１／２になる一方潤滑剤はスペー
サボールから供給されるが。The above example is shown in FIG. As shown in the figure, since the load is borne by the metal balls, the load bearing capacity is halved compared to the case where all the balls are metal, while the lubricant is supplied from the spacer balls.
金属ホール１個に対し、スペーサポール１個の割合であ
てがわれるため長寿命が期待できる。また自己潤滑性材
質の外径の小さいボール（スペーサボール）と金属材質
のボールとの組合わせ比率を１＝２にし金属ポール２個
の次にスペーサボール１個の順に配置する。上記例につ
いて第４図に示す。図に示す様に荷重の負担は全てが金
属ボールの場合に較べ荷重負荷能力は２／３になる。一
方間滑剤は金属ボール２個に対し、スペーサボール１個
の割合であてがわれるため、寿命は短くなる。Since one spacer pole is applied to one metal hole, a long life can be expected. Further, the combination ratio of balls (spacer balls) made of a self-lubricating material with a small outer diameter and balls made of a metal material is set to 1=2, and the two metal poles are then arranged in the order of one spacer ball. The above example is shown in FIG. As shown in the figure, the load carrying capacity is 2/3 that of the case where all metal balls are used. On the other hand, since the spacer lubricant is applied at a ratio of one spacer ball to two metal balls, the service life is shortened.
以にの様に荷重負荷能力より寿命を重視する時は」−記
（１）項の組合わせを、寿命より荷重負荷能力を重視す
る時は−Ｉ；記（２）項の組合わせを選択すれば良い。If life is more important than load-bearing capacity as described above, select the combination in item (1), and if load-bearing capacity is more important than life, select the combination in item (2). Just do it.
以Ｊ二のように、この発明によれば一部のボールを外径
を小さくシ、材質を自己潤滑性の材料に変更したので、
真空中において長寿命のボールねじが得られる効果があ
る。As shown in J2 above, according to this invention, the outer diameter of some of the balls is reduced and the material is changed to a self-lubricating material.
This has the effect of providing a long-life ball screw in a vacuum.
第１図はこの発明の一実施例によるボールねじを示す透
視図、第２図は第１図の軸断面図、第３図、第４図はこ
の発明の他の変形例を示す軸直角断面図、第５図は従来
のボールねじを示す透視図である。
（１）はねじ軸、（２）はナツト、（３）はボール、（
４）はスペーサポール、り５）はリターンチューブであ
る。
なお１図中、同一符号は同一、又は相当部分を示す。FIG. 1 is a perspective view showing a ball screw according to an embodiment of the present invention, FIG. 2 is an axial sectional view of FIG. FIG. 5 is a perspective view showing a conventional ball screw. (1) is the screw shaft, (2) is the nut, (3) is the ball, (
4) is a spacer pole, and 5) is a return tube. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts.
Claims (2)
ールと、上記ボールにみぞで接触するナット及び上記ね
じ軸のみぞを転動する上記ボールを循環させるための経
路によって構成されるボールねじにおいて、上記複数の
ボールのうち一部のボールを金属で形成し、また他のボ
ールを前記金属のボールより外径が小さく、かつ自己潤
滑性のある材料で形成したことを特徴とするボールネジ
。(1) Consists of a screw shaft, a plurality of balls that contact the grooves of the screw shaft, a nut that contacts the balls through the grooves, and a path for circulating the balls that roll in the grooves of the screw shaft. The ball screw is characterized in that some of the plurality of balls are made of metal, and other balls are made of a material that has a smaller outer diameter than the metal balls and is self-lubricating. ball screw.
されたボールの１つ又は２つおきに配置したことを特徴
とする特許請求の範囲第（１）項記載のボールねじ。(2) The ball screw according to claim (1), characterized in that a ball made of a self-lubricating material is arranged at every one or every second ball made of metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31698488A JPH02163550A (en) | 1988-12-15 | 1988-12-15 | Ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31698488A JPH02163550A (en) | 1988-12-15 | 1988-12-15 | Ball screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02163550A true JPH02163550A (en) | 1990-06-22 |
Family
ID=18083122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31698488A Pending JPH02163550A (en) | 1988-12-15 | 1988-12-15 | Ball screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02163550A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0603067A1 (en) * | 1992-12-17 | 1994-06-22 | AEROSPATIALE Société Nationale Industrielle | Roller-screw-mechanism for a spacecraft and linear actuator comprising such mechanism |
| US6149307A (en) * | 1997-12-19 | 2000-11-21 | Nippon Thompson Co., Ltd. | Relatively movable unit with rolling elements |
-
1988
- 1988-12-15 JP JP31698488A patent/JPH02163550A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0603067A1 (en) * | 1992-12-17 | 1994-06-22 | AEROSPATIALE Société Nationale Industrielle | Roller-screw-mechanism for a spacecraft and linear actuator comprising such mechanism |
| US6149307A (en) * | 1997-12-19 | 2000-11-21 | Nippon Thompson Co., Ltd. | Relatively movable unit with rolling elements |
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