JP2013024330A - Ball screw seal - Google Patents

Ball screw seal Download PDF

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Publication number
JP2013024330A
JP2013024330A JP2011159888A JP2011159888A JP2013024330A JP 2013024330 A JP2013024330 A JP 2013024330A JP 2011159888 A JP2011159888 A JP 2011159888A JP 2011159888 A JP2011159888 A JP 2011159888A JP 2013024330 A JP2013024330 A JP 2013024330A
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Prior art keywords
nut
seal
ball screw
axial direction
screw shaft
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Withdrawn
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JP2011159888A
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Japanese (ja)
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Hidenori Saito
秀徳 齋藤
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NSK Ltd
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NSK Ltd
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Priority to JP2011159888A priority Critical patent/JP2013024330A/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
    • 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
    • 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

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

Abstract

PROBLEM TO BE SOLVED: To provide a ball screw seal which retains a lubricant within a nut and prevents a foreign substance from entering the nut, and which has simple structure and low cost.SOLUTION: A lip part 41 of a seal 4 is comprised of a groove contact portion 41a in contact with spiral grooves 2a of a threaded shaft 2, an outer circumference contact portion 41b in contact with an outer circumferential surface 2b of the threaded shaft 2, and a connection part 41c connecting both portions 41a, 41b. A distal end of the groove contact portion 41a is turned toward the inside of a nut 1 in an axial direction, and a distal end of the outer circumference contact portion 41b is turned toward the outside of the nut 1 in the axial direction.

Description

この発明は、ボールねじのナットの軸方向端部に取り付けて使用されるシールに関する。   The present invention relates to a seal used by being attached to an axial end of a nut of a ball screw.

ボールねじは、内周面に螺旋溝が形成されたナットと、外周面に螺旋溝が形成されたねじ軸と、ナットの螺旋溝とねじ軸の螺旋溝で形成される軌道の間に配置されたボールと、ボールを軌道の終点から始点に戻すボール戻し経路とを備え、前記軌道内をボールが転動することで前記ナットがねじ軸に対して相対移動する装置である。
このようなボールねじは、ナットの内部に潤滑剤を供給して使用される。また、ねじ軸に付着した塵埃や摩耗粉などの異物がナット内に入り込むと、ボールや螺旋溝に焼付きなどの損傷が生じる原因となるため、ナット内部への異物の侵入を防ぐ必要がある。そこで、ナット内部に供給された潤滑剤の外部への排出防止とナット内部への異物の侵入防止を目的として、ナットの軸方向端部にリング状のシールが取り付けられている。 The ball screw is disposed between a nut having a spiral groove formed on the inner peripheral surface, a screw shaft having a spiral groove formed on the outer peripheral surface, and a raceway formed by the spiral groove of the nut and the spiral groove of the screw shaft. And a ball return path for returning the ball from the end point of the track to the start point, and the nut moves relative to the screw shaft as the ball rolls in the track.
Such a ball screw is used by supplying a lubricant to the inside of the nut. Also, if foreign matter such as dust or abrasion powder adhering to the screw shaft enters the nut, it may cause damage such as seizure of the ball or spiral groove, so it is necessary to prevent foreign matter from entering the nut. . Therefore, a ring-shaped seal is attached to the axial end of the nut for the purpose of preventing the lubricant supplied to the inside of the nut from being discharged to the outside and preventing foreign matter from entering the nut.

特許文献１には、ナット内部の潤滑剤を保持できるとともに、ナット内部への異物の侵入を防止できるシールとして、軸方向内側の端面に潤滑剤保持用のスリットを有し、軸方向外側の端面に異物除去用のスリットを有するものが記載されている。
特許文献２には、ナット内部の潤滑剤を保持できるとともに、ナット内部への異物の侵入を防止できるシールとして、潤滑剤保持用のリング状部材と異物除去用のリング状部材からなり、両部材の内周部がねじ軸の螺旋溝と外周面に接触し、異物除去用のリング状部材を軸方向外側に配置するものが記載されている。 In Patent Document 1, as a seal that can hold the lubricant inside the nut and prevent foreign matter from entering the inside of the nut, it has a slit for holding the lubricant in the axially inner end face, and the axially outer end face. Have a slit for removing foreign matter.
In Patent Document 2, a seal that can hold the lubricant inside the nut and prevent foreign matter from entering the nut is made up of a ring-like member for retaining the lubricant and a ring-like member for removing the foreign matter. In which a ring-shaped member for removing foreign matter is disposed on the outer side in the axial direction.

特開２０００−１３０５４４号公報JP 2000-130544 A 特開２００２−３６４７２６号公報JP 2002-364726 A

特許文献１および２に記載されたボールねじ用シールは、複雑な構造であるか複数の部材を組み合わせたものであるため、コストの面で改善の余地がある。
この発明の課題は、ナット内部の潤滑剤を保持できるとともに、ナット内部への異物の侵入を防止できるボールねじ用シールであって、簡単な構造でコストが低いものを提供することである。 Since the ball screw seal described in Patent Documents 1 and 2 has a complicated structure or a combination of a plurality of members, there is room for improvement in terms of cost.
An object of the present invention is to provide a ball screw seal capable of holding a lubricant inside a nut and preventing foreign matter from entering the nut, and having a simple structure and low cost.

上記課題を解決するために、この発明のボールねじ用シールは、ボールねじのナットの軸方向端部に取り付けて使用され、ボールねじのねじ軸の螺旋溝および外周面に接触させるリップ部と、リップ部の外周側に連続する基部と、を有するリング状のシールであって、前記リップ部の先端が、ねじ軸の螺旋溝に接触させる部分では軸方向でナットの内側に向き、ねじ軸の外周面に接触させる部分では軸方向でナットの外側に向き、両部分の境界が連結されていることを特徴とする。   In order to solve the above-mentioned problems, a ball screw seal according to the present invention is used by being attached to an axial end portion of a ball screw nut, and a lip portion which is brought into contact with a spiral groove and an outer peripheral surface of the screw shaft of the ball screw; A ring-shaped seal having a base portion continuous to the outer peripheral side of the lip portion, wherein the tip of the lip portion is directed inward of the nut in the axial direction at a portion where the tip of the lip portion contacts the spiral groove of the screw shaft, In the part which contacts an outer peripheral surface, it faces to the outer side of a nut in the axial direction, and the boundary of both parts is connected, It is characterized by the above-mentioned.

リップ部の先端が軸方向でナットの外側に向いている部分は、ナット内部への異物の侵入を防止する作用を有し、リップ部の先端が軸方向でナットの内側に向いている部分は、ナット内部の潤滑剤を保持する（外部へ排出させない）作用を有する。よって、この発明のボールねじ用シールは、ナット内部への異物の侵入を防止する作用とナット内部の潤滑剤を保持する作用の両方を発揮できる。また、特許文献１のシールよりも構造が簡単であり、金型を変更すれば通常のシールと同じ方法で作製できる。   The part where the tip of the lip part faces the outside of the nut in the axial direction has an effect of preventing foreign matter from entering the inside of the nut, and the part where the tip of the lip part faces the inside of the nut in the axial direction , Has the action of holding the lubricant inside the nut (not discharging to the outside). Therefore, the ball screw seal according to the present invention can exhibit both the function of preventing foreign matter from entering the nut and the function of retaining the lubricant inside the nut. Further, the structure is simpler than the seal of Patent Document 1, and if the mold is changed, it can be produced by the same method as a normal seal.

この発明によれば、ナット内部の潤滑剤を保持できるとともに、ナット内部への異物の侵入を防止でき、簡単な構造でコストが低いボールねじ用シールが提供される。   According to the present invention, it is possible to provide a ball screw seal that can hold the lubricant inside the nut and prevent foreign matter from entering the nut, and has a simple structure and low cost.

実施形態のボールねじ用シールが取り付けられた状態のボールねじを示す部分断面図である。It is a fragmentary sectional view showing a ball screw in the state where a ball screw seal of an embodiment was attached. 図１のボールねじを示す正面図である。It is a front view which shows the ball screw of FIG. 実施形態のボールねじ用シールを示す正面図である。It is a front view which shows the seal | sticker for ball screws of embodiment. 図３のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図３のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. 図３とはリップ部の連結部の形状が異なるボールねじ用シールを示す正面図である。It is a front view which shows the seal | sticker for ball screws from which the shape of the connection part of a lip | rip part differs from FIG. 図６のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. ２枚のシールが取付けられた状態のボールねじを示す他の実施形態の図である。It is a figure of other embodiment which shows the ball screw in the state where two seals were attached.

以下、この発明の実施形態について説明する。
図１に示すボールねじは、ナット１と、ねじ軸２と、ボール３と、この発明の実施形態に相当するシール４を備えている。ナット１の軸方向両端に、シール４を取り付けるための凹部１１が形成されている。
ナット１の内周面に螺旋溝１ａが形成され、ねじ軸２の外周面に螺旋溝２ａが形成されている。ボール３は、ナット１の螺旋溝１ａとねじ軸２の螺旋溝２ａで形成される軌道溝の間に配置されている。 Embodiments of the present invention will be described below.
The ball screw shown in FIG. 1 includes a nut 1, a screw shaft 2, a ball 3, and a seal 4 corresponding to an embodiment of the present invention. Concave portions 11 for attaching the seal 4 are formed at both axial ends of the nut 1.
A spiral groove 1 a is formed on the inner peripheral surface of the nut 1, and a spiral groove 2 a is formed on the outer peripheral surface of the screw shaft 2. The ball 3 is disposed between the raceway grooves formed by the spiral groove 1 a of the nut 1 and the spiral groove 2 a of the screw shaft 2.

図２〜５に示すように、シール４は、ねじ軸２の螺旋溝２ａおよび外周面２ｂに接触させるリップ部４１と、リップ部４１の外周側に連続する基部４２と、を有する。基部４２はリング状の芯金４３の一方の面に形成されている。リップ部４１の内周縁の正面形状は、ねじ軸２の軸直角断面形状と相似である。シール４には、取付用のボルト挿入穴として、基部４２および芯金４３を貫通する各３個の貫通穴４２ａ，４３ａが、周方向に等間隔で形成されている。   As shown in FIGS. 2 to 5, the seal 4 includes a lip portion 41 that is brought into contact with the spiral groove 2 a and the outer peripheral surface 2 b of the screw shaft 2, and a base portion 42 that is continuous on the outer peripheral side of the lip portion 41. The base 42 is formed on one surface of a ring-shaped cored bar 43. The front shape of the inner peripheral edge of the lip portion 41 is similar to the cross-sectional shape perpendicular to the axis of the screw shaft 2. In the seal 4, three through holes 42 a and 43 a that penetrate the base 42 and the cored bar 43 are formed at equal intervals in the circumferential direction as bolt insertion holes for mounting.

シール４のリップ部４１は、ねじ軸２の螺旋溝２ａに接触させる溝接触部分４１ａと、ねじ軸２の外周面２ｂに接触させる外周接触部分４１ｂと、両部分４１ａ，４１ｂを連結する連結部４１ｃとからなる。溝接触部分４１ａの先端は軸方向でナット１の内側に向き、外周接触部分４１ｂの先端は軸方向でナット１の外側に向いている。
連結部４１ｃは、基部４２の板面（軸方向に垂直な面）に対して傾斜する面で両部分の境界を連結している。この連結部４１ｃにより、溝接触部分４１ａから外周接触部分４１ｂに向かう間に、リップ部４１の先端の軸方向での向きが、ナット１の内側向きから外側
向きに徐々に変化している。 The lip portion 41 of the seal 4 includes a groove contact portion 41a that is brought into contact with the spiral groove 2a of the screw shaft 2, an outer peripheral contact portion 41b that is brought into contact with the outer peripheral surface 2b of the screw shaft 2, and a connecting portion that connects the portions 41a and 41b. 41c. The tip of the groove contact portion 41a faces the inside of the nut 1 in the axial direction, and the tip of the outer peripheral contact portion 41b faces the outside of the nut 1 in the axial direction.
The connection part 41c connects the boundary of both parts with the surface which inclines with respect to the plate | board surface (surface perpendicular | vertical to an axial direction) of the base 42. FIG. With this connecting portion 41c, the direction of the tip of the lip portion 41 in the axial direction gradually changes from the inner side toward the outer side of the nut 1 while moving from the groove contact portion 41a to the outer peripheral contact portion 41b.

このシール４は、リップ部４１の形状に対応させて金型を変更することで、通常のボールねじ用シール（リップ部の先端が周方向全体で同じ向きになっているシール）と同じ方法で作製することができる。
この実施形態のシール４によれば、先端が軸方向でナット１の外側に向いているリップ部４１の外周接触部分４１ｂで、ナット１の内部への異物侵入が防止され、先端が軸方向でナット１の内側に向いているリップ部４１の溝接触部分４１ａで、ナット１の内部の潤滑剤が保持される。すなわち、簡単な構造で、ナット１の内部への異物侵入を防止する作用とナット１の内部の潤滑剤を保持する作用の両方を発揮できる。 The seal 4 can be changed in accordance with the shape of the lip portion 41 to change the mold in the same manner as a normal ball screw seal (a seal in which the tip of the lip portion is in the same direction in the entire circumferential direction). Can be produced.
According to the seal 4 of this embodiment, foreign matter intrusion into the inside of the nut 1 is prevented at the outer peripheral contact portion 41b of the lip portion 41 whose tip is directed to the outside of the nut 1 in the axial direction, and the tip is in the axial direction. The lubricant inside the nut 1 is held at the groove contact portion 41 a of the lip portion 41 facing the inside of the nut 1. That is, with a simple structure, both the action of preventing foreign matter from entering the inside of the nut 1 and the action of holding the lubricant inside the nut 1 can be exhibited.

また、リップ部４１の溝接触部分４１ａの先端が軸方向でナット１の外側に向き、外周接触部分４１ｂの先端が軸方向でナット１の内側に向いているシールよりも、異物侵入防止性能の点で優れている。
なお、この実施形態では、リップ部４１の先端の向きが異なる両部分４１ａ，４１ｂの境界を、連結部４１ｃにより、基部４２の板面（軸方向に垂直な面）に対して傾斜する面で連結しているが、図６および７に示すように、基部４２の板面に対して垂直な面（連結部４１ｄ）で連結してもよい。 Moreover, the foreign substance intrusion prevention performance is better than a seal in which the tip of the groove contact portion 41a of the lip portion 41 faces the outside of the nut 1 in the axial direction and the tip of the outer peripheral contact portion 41b faces the inside of the nut 1 in the axial direction. Excellent in terms.
In this embodiment, the boundary between the portions 41a and 41b having different tip directions of the lip portion 41 is a surface that is inclined with respect to the plate surface (surface perpendicular to the axial direction) of the base portion 42 by the connecting portion 41c. Although connected, as shown in FIGS. 6 and 7, they may be connected by a surface (connecting portion 41 d) perpendicular to the plate surface of the base portion 42.

また、上記実施の形態では、ナット１の軸方向両端に夫々シール４を１枚づつ取り付けた例を示したが図８に示すように、シールを２枚向き合せて取り付けてもよい。
複数枚のシール４を取り付けることによって、ナット１の内部への異物侵入を防止する作用とナット１の内部の潤滑剤を保持する作用の両方の作用を更に発揮することができる。 Moreover, in the said embodiment, although the example which attached the seal | sticker 4 one each to the axial direction both ends of the nut 1 was shown, as shown in FIG. 8, you may attach two stickers facing each other.
By attaching a plurality of seals 4, it is possible to further exhibit both the action of preventing foreign matter from entering the inside of the nut 1 and the action of holding the lubricant inside the nut 1.

１ ナット
１ａ ねじ軸の螺旋溝
１１ シール取り付け用の凹部
２ ねじ軸
２ａ ねじ軸の螺旋溝
３ ボール
４ シール
４１ リップ部
４１ａ 溝接触部分（ねじ軸の螺旋溝に接触させる部分）
４１ｂ 外周接触部分（ねじ軸の外周面に接触させる部分）
４１ｃ 連結部
４１ｄ 連結部
４２ 基部
４２ａ 基部の貫通穴
４３ 芯金
４３ａ 芯金の貫通穴
５ ボルト DESCRIPTION OF SYMBOLS 1 Nut 1a Spiral groove | channel 11 of a screw shaft Recess 2 for screw attachment 2 Screw shaft 2a Spiral groove of a screw shaft 3 Ball 4 Seal 41 Lip part 41a Groove contact part (part made to contact the spiral groove of a screw shaft)
41b Peripheral contact part (part to be in contact with the outer peripheral surface of the screw shaft)
41c connecting portion 41d connecting portion 42 base portion 42a base through hole 43 cored bar 43a cored bar through hole 5 bolt

Claims (1)

ボールねじのナットの軸方向端部に取り付けて使用され、ボールねじのねじ軸の螺旋溝および外周面に接触させるリップ部と、リップ部の外周側に連続する基部と、を有するリング状のシールであって、
前記リップ部の先端が、ねじ軸の螺旋溝に接触させる部分では軸方向でナットの内側に向き、ねじ軸の外周面に接触させる部分では軸方向でナットの外側に向き、両部分の境界が連結されていることを特徴とするボールねじ用シール。 A ring-shaped seal that is used by being attached to the axial end portion of a ball screw nut, and has a lip portion that comes into contact with the spiral groove and the outer peripheral surface of the screw shaft of the ball screw, and a base portion that is continuous on the outer peripheral side of the lip portion. Because
The tip of the lip portion faces the inside of the nut in the axial direction at the portion where it contacts the spiral groove of the screw shaft, and faces the outside of the nut in the axial direction at the portion where it contacts the outer peripheral surface of the screw shaft. A ball screw seal characterized by being connected.
JP2011159888A 2011-07-21 2011-07-21 Ball screw seal Withdrawn JP2013024330A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011159888A JP2013024330A (en) 2011-07-21 2011-07-21 Ball screw seal

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Application Number Priority Date Filing Date Title
JP2011159888A JP2013024330A (en) 2011-07-21 2011-07-21 Ball screw seal

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3048337A4 (en) * 2013-10-22 2017-06-07 NSK Ltd. Seal for ball-screw device
KR200491652Y1 (en) * 2019-01-14 2020-05-15 하이윈 테크놀로지스 코포레이션 Ball screw with a dustproof unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3048337A4 (en) * 2013-10-22 2017-06-07 NSK Ltd. Seal for ball-screw device
KR200491652Y1 (en) * 2019-01-14 2020-05-15 하이윈 테크놀로지스 코포레이션 Ball screw with a dustproof unit

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Effective date: 20141007