JPH11132305A - Sealing device for ball screw - Google Patents

Sealing device for ball screw

Info

Publication number
JPH11132305A
JPH11132305A JP9297284A JP29728497A JPH11132305A JP H11132305 A JPH11132305 A JP H11132305A JP 9297284 A JP9297284 A JP 9297284A JP 29728497 A JP29728497 A JP 29728497A JP H11132305 A JPH11132305 A JP H11132305A
Authority
JP
Japan
Prior art keywords
spiral groove
screw shaft
seal member
oil
projection
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
Application number
JP9297284A
Other languages
Japanese (ja)
Inventor
Masahiro Nobutomo
雅弘 信朝
Masaaki Toda
正明 戸田
Yasushi Shibata
靖史 柴田
Kimito Ushida
公人 牛田
Takayuki Kowada
貴之 小和田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP9297284A priority Critical patent/JPH11132305A/en
Publication of JPH11132305A publication Critical patent/JPH11132305A/en
Pending legal-status Critical Current

Links

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
    • 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

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To form an oil film so as to improve lubricating performance of a sliding contact part by arranging a reservoir part for oil between a spiral groove surface and a projection part surface of a seal member, in a device for sealing an inside of a ball nut by bringing the projection part of the seal member into contact with the spiral groove of a screw shaft. SOLUTION: A reservoir part 9 for oil is arranged between a spiral groove 1a surface of a screw shaft 1 and a projection part 5a surface of a seal member, the surface of the projection part 5a which is brought into contact with the spiral groove 1a of the screw shaft 1 is cut partially, and thereby, oil oozed from the seal member 5 is held on the reservoir part 9. When the screw shaft 1 is relatively rotated with the ball nut, and in the case where the projection part 5a is brought into sliding contact with the spiral groove 1a of the screw shaft 1, an oil film can be surely formed on the sliding contact part, and also lubricating performance is improved on the sliding contact part. Since oil on the sliding contact part is supplied to the part where the ball is brought into sliding contact with spiral groove 1a of the screw shaft 1 and the ball nut, the lubricating performance is improved in the ball nut.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ボールねじのボー
ルナット内をシールするためのシール装置に関する。The present invention relates to a sealing device for sealing the inside of a ball nut of a ball screw.

【０００２】[0002]

【従来の技術】ボールねじは、ねじ軸の外周面に設けた
螺旋溝と、ボールナットの内周面に設けた螺旋溝との間
に複数のボールを配し、ねじ軸（またはボールナット）
の回転動力をボールを介してボールナット（またはねじ
軸）の推力に変換するものである。このボールねじに
は、ボールナットの内部に充填した潤滑剤の洩出、およ
び外部からの異物の進入を防止するため、ねじ軸の螺旋
溝に嵌合する突部を有するシール部材をボールナットの
両端部に装着する場合が多い。2. Description of the Related Art In a ball screw, a plurality of balls are arranged between a spiral groove provided on an outer peripheral surface of a screw shaft and a spiral groove provided on an inner peripheral surface of a ball nut.
Is converted into thrust of a ball nut (or a screw shaft) via a ball. The ball screw has a seal member having a protrusion fitted into a spiral groove of the screw shaft, in order to prevent leakage of lubricant filled in the ball nut and entry of foreign matter from the outside. Often attached to both ends.

【０００３】従来のシール装置としては、図７に示すよ
うに、ボールナット（22）の両端部に装着したシール部
材（25）の突部（25ａ）とねじ軸（21）の螺旋溝（21
ａ）との間に隙間を設けたいわゆる非接触型シールが一
般的であるが、この種のシール装置では、当該隙間の存
在により、使用条件によってはシール不足に陥るおそれ
があるため、シール性を向上させるべく、シール部材の
突部とねじ軸の螺旋溝とを摺接させる、いわゆる接触型
のシール部材も従来から多数提案されている（実開平6
−47762 号公報、実開平7-4952号公報等参照）。As a conventional sealing device, as shown in FIG. 7, a protrusion (25a) of a seal member (25) mounted on both ends of a ball nut (22) and a spiral groove (21) of a screw shaft (21) are used.
Although a so-called non-contact type seal having a gap between the first and second seals is generally used, this type of seal device may cause insufficient sealing depending on the use conditions due to the presence of the gap. In order to improve the sealing performance, there have been proposed many contact-type seal members in which the protrusion of the seal member and the spiral groove of the screw shaft are in sliding contact with each other.
-47762, Japanese Utility Model Laid-Open No. 7-4952, etc.).

【０００４】[0004]

【発明が解決しようとする課題】上記接触型シール装置
では、シール部材を、組織内に潤滑油または潤滑グリー
スを保持する固形潤滑組成物で形成し、これをねじ軸に
直接接触させて、シール部材から滲み出した油で油膜を
形成し、摺接部における摩擦抵抗を低減する。従って、
このシール装置は、シール部材をねじ軸の螺旋溝に密着
させているにもかかわらず、トルク損失が少なく、また
摺接部における摩擦による発熱も少ない等の特徴を有す
る。In the above-mentioned contact-type sealing device, the sealing member is formed of a solid lubricating composition holding lubricating oil or lubricating grease in the tissue, and the sealing member is brought into direct contact with the screw shaft to form a seal. An oil film is formed by oil oozing out of the member, and the frictional resistance at the sliding contact portion is reduced. Therefore,
This seal device has features such as a small torque loss and a small heat generation due to friction at the sliding contact portion, despite the close contact of the seal member with the spiral groove of the screw shaft.

【０００５】しかし、シール部材の突部がねじ軸の螺旋
溝表面に密着する構造であるため、突部が螺旋溝に沿っ
て相対移動する際に、突部がシール部材から滲み出した
油を摺接部外に押し出し、油膜の形成を阻害するおそれ
がある。However, since the projecting portion of the seal member is in close contact with the surface of the spiral groove of the screw shaft, when the projecting portion relatively moves along the spiral groove, the projecting portion removes oil that has oozed from the sealing member. It may be pushed out of the sliding contact portion and hinder the formation of an oil film.

【０００６】そこで、本発明では、接触型のシール装置
において、良好な油膜を安定して形成可能とし、摺接部
での潤滑性を向上せさ得るボールねじのシール装置の提
供を目的とする。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a ball screw sealing device capable of stably forming a good oil film and improving lubricity at a sliding contact portion in a contact type sealing device. .

【０００７】[0007]

【課題を解決するための手段】上記目的を達成すべく、
本発明では、ねじ軸の螺旋溝に嵌合する、固形潤滑組成
物からなる突部を備えたシール部材をボールナットに装
着し、シール部材の突部をねじ軸の螺旋溝に接触させて
ボールナット内をシールするものにおいて、前記螺旋溝
表面とシール部材の突部表面との間に、油の溜り部を設
けることとした。In order to achieve the above object,
According to the present invention, a ball nut is fitted with a seal member having a projection made of a solid lubricating composition, which fits into a spiral groove of a screw shaft, and the projection of the seal member is brought into contact with the spiral groove of the screw shaft. In the case of sealing the inside of the nut, an oil reservoir is provided between the surface of the spiral groove and the surface of the protrusion of the seal member.

【０００８】油の溜り部は、シール部材の突部表面を部
分的に肉取りすることにより形成することができる。The oil reservoir can be formed by partially removing the surface of the projection of the seal member.

【０００９】突部表面の肉取り部分は、穴もしくは溝
で、または突部表面を部分的に除去した平面状の逃げで
形成される。[0009] The lightening portion of the surface of the projection is formed by a hole or a groove, or by a flat relief in which the surface of the projection is partially removed.

【００１０】以上の場合においては、シール部材を、円
周方向の複数箇所で分割し、各分割部分を内径側に弾圧
してシール部材の突部をねじ軸の螺旋溝に接触させるの
が望ましい。In the above case, it is desirable to divide the seal member at a plurality of positions in the circumferential direction, and to press each of the divided portions toward the inner diameter side so that the protrusion of the seal member comes into contact with the spiral groove of the screw shaft. .

【００１１】[0011]

【発明の実施の形態】以下、本発明の好ましい実施形態
を図１乃至図６に基いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS.

【００１２】図５は、接触型シール装置を有するボール
ねじの一例を示す断面図である。このボールねじは、ね
じ軸（１）の外周面に設けられた螺旋溝（1a）と、ボー
ルナット（２）の螺旋溝（2a）との間に複数のボール
（３）を配置して構成され、ねじ軸（１）とボールナッ
ト（２）とを相対回転させて、その回転動力をボール
（３）を介して相手側に伝達することにより、ボールナ
ット（２）またはねじ軸（１）を軸方向に相対移動させ
るものである。ボールナット（２）の内径面両端部には
凹部が形成され、凹部にリング状のシール部材（５）と
補助リング（６）とが装着されている。FIG. 5 is a sectional view showing an example of a ball screw having a contact-type sealing device. This ball screw is configured by disposing a plurality of balls (3) between a spiral groove (1a) provided on the outer peripheral surface of a screw shaft (1) and a spiral groove (2a) of a ball nut (2). Then, by rotating the screw shaft (1) and the ball nut (2) relative to each other and transmitting the rotational power to the other side via the ball (3), the ball nut (2) or the screw shaft (1) is transmitted. Are relatively moved in the axial direction. A recess is formed at both ends of the inner surface of the ball nut (2), and a ring-shaped seal member (5) and an auxiliary ring (6) are mounted in the recess.

【００１３】シール部材（５）は、合成樹脂基材に潤滑
油や潤滑グリース等の潤滑成分を分散保持させた固形潤
滑組成物で形成される。具体的には、超高分子量ポリオ
レフィン粉末９５〜１重量％に潤滑油または潤滑グリー
ス５〜９９重量％を混合し、この混合物を所定形状の型
に入れ、超高分子量ポリオレフィンのゲル化温度以上の
温度で加熱し、その後、冷却固化させて形成される［油
の滲み出しを抑制するための添加物（固形ワックス等）
を１〜５０重量％加える場合もある］。The seal member (5) is formed of a solid lubricating composition in which a lubricating component such as lubricating oil or lubricating grease is dispersed and held in a synthetic resin base material. Specifically, lubricating oil or lubricating grease is mixed with 95 to 1% by weight of ultrahigh molecular weight polyolefin powder and 5 to 99% by weight, and the mixture is placed in a mold having a predetermined shape, and the mixture is heated to a temperature higher than the gelation temperature of the ultrahigh molecular weight polyolefin. It is formed by heating at a temperature and then cooling and solidifying [additives for suppressing oil seepage (solid wax, etc.)
May be added in an amount of 1 to 50% by weight].

【００１４】超高分子量ポリオレフィン粉末としては、
例えばポリエチレン、ポリプロピレン、ポリブデン若し
くはこれらの共重合体からなる粉末、またはそれぞれ単
独の粉末を配合した混合粉末で、各粉末の平均分子量約
１×１０6 〜５×１０6 のものを使用することができ
る。The ultra-high molecular weight polyolefin powder includes:
For example, powders of polyethylene, polypropylene, polybutene, or copolymers thereof, or mixed powders each containing a single powder, each powder having an average molecular weight of about 1 × 10 6 to 5 × 10 6 may be used. it can.

【００１５】潤滑油としては、鉱油、ポリオールエステ
ル油、ジエステル油、合成炭化水素油、アルキルフェニ
ルエーテル油あるいはこれらの混合物からなる潤滑油を
使用することができる。一方、潤滑グリースの種類は特
に限定されるものではなく、石けん又は非石けんで増稠
した潤滑グリースであれば、リチウム石けん−ジエステ
ル系、リチウム石けん−鉱油系、ナトリウム石けん−鉱
油系、アルミニウム石けん−鉱油系、リチウム石けん−
ジエステル鉱油系、非石けん−ジエステル系、非石けん
−鉱油系、非石けん−ポリオールエステル系、リチウム
石けん−ポリオールエステル系等から適宜選択される
が、少なくとも超高分子量ポリオレフィンのゲル化点よ
りも高い滴点を有するものでなければならない。As the lubricating oil, a lubricating oil comprising mineral oil, polyol ester oil, diester oil, synthetic hydrocarbon oil, alkylphenyl ether oil or a mixture thereof can be used. On the other hand, the type of the lubricating grease is not particularly limited, and if the lubricating grease is soap or non-soap and thickened, lithium soap-diester, lithium soap-mineral oil, sodium soap-mineral oil, aluminum soap- Mineral oil, lithium soap-
Diester mineral oil type, non-soap-diester type, non-soap-mineral oil type, non-soap-polyol ester type, lithium soap-polyol ester type, etc., but at least a drop higher than the gel point of ultra-high molecular weight polyolefin It must have a point.

【００１６】シール部材（５）は、一体のリング状に形
成しても良いが、ねじ軸（１）やシール部材（５）の寸
法精度に影響されず、ねじ軸（１）と適度な接触力で接
触するように、例えば図６（ａ）（ｂ）に示すように、
円周等配位置の３箇所で分割した分割構造とすることが
できる。分割した各シール部材（５）は、内径方向に突
出した突部（5a）を有し、この突部（5a）はねじ軸
（１）の螺旋溝（1a）に対応した形状・寸法を有する。
また、シール部材（５）の各分割部分の分割面（5b）間
には、僅かな隙間がある。シール部材（５）の３つの分
割部分は、それぞれ適宜の手段で内径側に弾圧され、そ
のために突部（5a）とねじ軸（１）の螺旋溝（1a）との
嵌合隙間は、図５（ｂ）に示すようにゼロあるいは僅か
にマイナス（締め代をもった状態）になっている。図面
では、弾圧手段として、ボールナット（２）のねじ穴
（2b）に螺着したボールプランジャ（８）を例示してい
るが、その他にも、例えばシール部材（５）の外周に嵌
着したガータスプリングを用いて各分割部分を内径側に
弾圧してもよい。また、シール部材（５）を軸方向の全
幅で完全に分割する他、途中部分までを複数の軸方向ス
リットで分割し、この分割部分のみを弾圧手段で内径側
に弾圧してもよい（詳細は、実開平 6-47762号公報参
照）。また、各分割部分の全てに突部（5a）を設ける必
要はなく、少なくともそのうちの一の分割部分に突部
（5a）が形成されていれば足りる。The seal member (5) may be formed in an integral ring shape, but is not affected by the dimensional accuracy of the screw shaft (1) and the seal member (5), and has an appropriate contact with the screw shaft (1). As shown in FIGS. 6A and 6B, for example, as shown in FIGS.
It is possible to adopt a divided structure divided into three places at equal circumferential positions. Each divided seal member (5) has a protrusion (5a) projecting in the inner diameter direction, and the protrusion (5a) has a shape and dimensions corresponding to the spiral groove (1a) of the screw shaft (1). .
There is a slight gap between the divided surfaces (5b) of the divided portions of the seal member (5). The three divided portions of the seal member (5) are resiliently pressed to the inner diameter side by appropriate means, so that the fitting gap between the projection (5a) and the spiral groove (1a) of the screw shaft (1) is shown in FIG. As shown in FIG. 5 (b), it is zero or slightly negative (a state with a margin). In the drawing, a ball plunger (8) screwed into a screw hole (2b) of a ball nut (2) is illustrated as a resilient means. Each divided portion may be elastically pressed toward the inner diameter side by using a garter spring. Further, in addition to completely dividing the seal member (5) by the entire width in the axial direction, the intermediate portion may be divided by a plurality of axial slits, and only this divided portion may be resiliently pressed to the inner diameter side by resilient means (details). See Japanese Utility Model Laid-Open No. 6-47762). Further, it is not necessary to provide the projections (5a) in all of the divided portions, and it is sufficient that the projections (5a) are formed in at least one of the divided portions.

【００１７】以上の構成から、シール部材（５）の突部
（5a）がねじ軸（１）の螺旋溝（1a）に対して密着状態
で摺接するため、ボールナット（２）内の潤滑剤が外部
に洩れにくくなり、外部から異物が侵入しにくくなる。
また、シール部材（５）の組織内に保持された潤滑成分
（油）が突部（5a）と螺旋溝（1a）との摺接部に滲み出
して油膜を形成するので、摺接部における摩擦抵抗を低
減することができる。さらに、シール部材（５）から摺
接部に滲み出した油が、ねじ軸（１）の回転に伴ってボ
ールナット（２）の内部に送られ、ボール（３）とねじ
軸（１）およびボールナット（２）の螺旋溝（1a、2a）
との接触部分の潤滑にも寄与する。With the above arrangement, the protrusion (5a) of the seal member (5) comes into close contact with the spiral groove (1a) of the screw shaft (1), so that the lubricant in the ball nut (2) is in contact. Is less likely to leak to the outside, and foreign matter is less likely to enter from the outside.
Further, since the lubricating component (oil) retained in the tissue of the seal member (5) seeps into the sliding contact portion between the projection (5a) and the spiral groove (1a), an oil film is formed. Friction resistance can be reduced. Further, oil that has oozed from the seal member (5) to the sliding contact portion is sent into the ball nut (2) with the rotation of the screw shaft (1), and the ball (3) and the screw shaft (1) and Spiral groove of ball nut (2) (1a, 2a)
It also contributes to the lubrication of the parts in contact with.

【００１８】以上説明した接触型のシール装置におい
て、本発明は、図１および図２に示すように、ねじ軸
（１）の螺旋溝（1a）表面とシール部材（５）の突部
（5a）表面との間に、油の溜り部（９：散点模様で示
す）を設けたものである。この溜り部（９）は、ねじ軸
（１）の螺旋溝（1a）と接触する突部（5a）表面を螺旋
溝（1a）表面に対して部分的に肉取りすることにより形
成され、両図面では、肉取り部として突部（5a）の両側
表面をその形方向に沿って平面的に除去して逃げを形成
した場合を例示している。なお、このような平面状の逃
げに代えて、突部（5a）の両側表面をその形成方向に沿
って凹状に除去した溝を形成しても良い。In the contact type sealing device described above, the present invention, as shown in FIGS. 1 and 2, employs the surface of the spiral groove (1a) of the screw shaft (1) and the projection (5a) of the sealing member (5). ) An oil reservoir (9: indicated by a dotted pattern) is provided between the surface and the surface. The pool (9) is formed by partially removing the surface of the protrusion (5a) that comes into contact with the spiral groove (1a) of the screw shaft (1) from the surface of the spiral groove (1a). In the drawings, a case is shown in which both sides of the projection (5a) are removed as a lightening portion in a plane along the shape thereof to form a clearance. Instead of such a planar relief, a groove may be formed in which both side surfaces of the protrusion (5a) are concavely removed along the forming direction.

【００１９】このような溜り部（９）を設けることによ
り、シール部材（５）から滲み出した油が溜り部（９）
に保持されるので、ねじ軸（１）とボールナット（２）
との相対回転時に突部（5a）とねじ軸（１）の螺旋溝
（1a）とが摺接する際にも、摺接部分に確実に油膜を形
成することができ、この部分での潤滑性を向上させるこ
とができる。また、摺接部の油がねじ軸（１）の回転に
伴ってボール（３）とねじ軸（１）およびボールナット
（２）の螺旋溝（1a、2a）との接触部分にも供給される
ので、ボールナット（２）の内部の潤滑性も向上する。
このような潤滑効果のさらなる安定化を図るため、溜り
部（９）は突部（5a）の頂点を挟んで軸方向の両側（両
側部）に設けるのが望ましい。By providing such a reservoir (9), oil oozing out from the seal member (5) can be accumulated.
Screw shaft (1) and ball nut (2)
When the projection (5a) and the spiral groove (1a) of the screw shaft (1) are in sliding contact with each other at the time of relative rotation, an oil film can be reliably formed on the sliding contact portion, and lubricity at this portion Can be improved. The oil in the sliding contact portion is also supplied to the contact portion between the ball (3) and the helical grooves (1a, 2a) of the screw shaft (1) and the ball nut (2) with the rotation of the screw shaft (1). Therefore, the lubricity inside the ball nut (2) is also improved.
In order to further stabilize such a lubricating effect, it is desirable that the pool portion (9) is provided on both sides (both sides) in the axial direction with the vertex of the protrusion (5a) interposed therebetween.

【００２０】図３および図４は本発明の他の実施形態を
表すもので、図３は突部（5a）表面に周方向に整列させ
た多数の穴を形成することにより（ランダムに形成して
もよい）、図４はねじ軸（１）の螺旋溝（1a）と直交す
る方向の多数条の溝を形成することにより、油の溜り部
（９）を形成したもので、図１に示す溜り部（９）と同
様の効果が奏される。FIG. 3 and FIG. 4 show another embodiment of the present invention. FIG. 3 shows that a large number of holes aligned in the circumferential direction are formed on the surface of the projection (5a) (the holes are randomly formed). FIG. 4 shows an oil reservoir (9) formed by forming a number of grooves in a direction perpendicular to the spiral groove (1a) of the screw shaft (1). The same effect as the pool portion (9) shown is exerted.

【００２１】なお、以上の説明では、シール部材（５）
を円周方向の複数箇所で分割し、各分割部分を内径側に
弾圧する場合を例示しているが、これは突部（5a）と螺
旋溝（1a）との密着性を確保するためである。従って、
そのような密着性が確保されるのであれば、シール部材
（５）を円周方向で連続する一体のリング状とする場合
にも（弾圧手段の有無は問わない）本発明を同様に適用
することができる。In the above description, the sealing member (5)
Is divided into a plurality of portions in the circumferential direction, and each divided portion is resiliently pressed toward the inner diameter side. However, this is to ensure the close contact between the protrusion (5a) and the spiral groove (1a). is there. Therefore,
As long as such adhesion is ensured, the present invention is similarly applied to the case where the sealing member (5) is formed into an integral ring shape that is continuous in the circumferential direction (with or without the resilient means). be able to.

【００２２】[0022]

【発明の効果】以上のように、本発明によれば、シール
部材から滲み出した油が溜り部に保持されるので、シー
ル部材の突部とねじ軸の螺旋溝とが摺接する際にも、摺
接部に確実に油膜を形成することができ、この部分での
潤滑性を向上させることができる。また、摺接部の油が
ねじ軸の回転に伴ってボールとねじ軸およびボールナッ
トの螺旋溝との接触部分にも供給されるので、ボールナ
ットの内部の潤滑性も向上する。As described above, according to the present invention, the oil oozing out of the seal member is held in the reservoir, so that even when the protrusion of the seal member and the spiral groove of the screw shaft are in sliding contact with each other. Thus, an oil film can be reliably formed on the sliding contact portion, and the lubricity at this portion can be improved. Further, the oil in the sliding contact portion is also supplied to the contact portion between the ball, the screw shaft and the spiral groove of the ball nut with the rotation of the screw shaft, so that the lubricity inside the ball nut is also improved.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明にかかるシール部材の一実施形態を示す
斜視図（一部断面）である。FIG. 1 is a perspective view (partially in section) showing an embodiment of a seal member according to the present invention.

【図２】ねじ軸の螺旋溝に嵌合させたシール部材（図１
に示す）の軸方向の断面図である。FIG. 2 shows a seal member (FIG. 1) fitted in a spiral groove of a screw shaft.
2) is an axial sectional view of FIG.

【図３】本発明にかかるシール部材の他の実施形態を示
す斜視図（一部断面）である。FIG. 3 is a perspective view (a partial cross section) showing another embodiment of the seal member according to the present invention.

【図４】本発明にかかるシール部材の他の実施形態を示
す斜視図（一部断面）である。FIG. 4 is a perspective view (a partial cross section) showing another embodiment of the seal member according to the present invention.

【図５】接触型のシール装置を有するボールねじの断面
図（ａ図）、および部分拡大断面図である（ｂ図）。5A and 5B are a sectional view of a ball screw having a contact-type sealing device (FIG. 5A) and a partially enlarged sectional view of FIG.

【図６】図５のボールねじのシール部材を示す正面図
（ａ図）、および側面図である（ｂ図）。6 is a front view (a view) and a side view (b view) showing a seal member of the ball screw of FIG. 5;

【図７】従来のボールねじの断面図である。FIG. 7 is a sectional view of a conventional ball screw.

【符号の説明】[Explanation of symbols]

１ ねじ軸 1a 螺旋溝 ２ ボールナット ３ ボール ５ シール部材 5a 突部 ８ 弾圧手段 ９ 溜り部 DESCRIPTION OF SYMBOLS 1 Screw shaft 1a Spiral groove 2 Ball nut 3 Ball 5 Seal member 5a Projection 8 Repression means 9 Reservoir

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 ねじ軸の螺旋溝に嵌合する、固形潤滑組
成物からなる突部を備えたシール部材をボールナットに
装着し、シール部材の突部をねじ軸の螺旋溝に接触させ
てボールナット内をシールするものにおいて、前記螺旋
溝表面とシール部材の突部表面との間に、油の溜り部を
設けたことを特徴とするボールねじのシール装置。1. A sealing member having a projection made of a solid lubricating composition and fitted to a spiral groove of a screw shaft is mounted on a ball nut, and the projection of the sealing member is brought into contact with the spiral groove of the screw shaft. A ball screw sealing device for sealing the inside of a ball nut, wherein an oil reservoir is provided between the surface of the spiral groove and the surface of the projection of the sealing member. 【請求項２】 油の溜り部を、シール部材の突部表面を
部分的に肉取りして形成した請求項１記載のボールねじ
のシール装置。2. The ball screw sealing device according to claim 1, wherein the oil reservoir is formed by partially removing the surface of the protrusion of the seal member. 【請求項３】 突部表面の肉取り部分が、穴もしくは溝
であり、または突部表面を部分的に除去した平面状の逃
げである請求項２記載のボールねじのシール装置。3. The ball screw sealing device according to claim 2, wherein the lightening portion on the surface of the projection is a hole or a groove, or a flat relief in which the surface of the projection is partially removed. 【請求項４】 シール部材を、円周方向の複数箇所で分
割し、各分割部分を内径側に弾圧してシール部材の突部
をねじ軸の螺旋溝に接触させることを特徴とする請求項
１乃至３何れか記載のボールねじのシール装置。4. The seal member is divided at a plurality of positions in a circumferential direction, and each divided portion is resiliently pressed to an inner diameter side so that a projection of the seal member comes into contact with a spiral groove of a screw shaft. The sealing device for a ball screw according to any one of claims 1 to 3.
JP9297284A 1997-10-29 1997-10-29 Sealing device for ball screw Pending JPH11132305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9297284A JPH11132305A (en) 1997-10-29 1997-10-29 Sealing device for ball screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9297284A JPH11132305A (en) 1997-10-29 1997-10-29 Sealing device for ball screw

Publications (1)

Publication Number Publication Date
JPH11132305A true JPH11132305A (en) 1999-05-21

Family

ID=17844533

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9297284A Pending JPH11132305A (en) 1997-10-29 1997-10-29 Sealing device for ball screw

Country Status (1)

Country Link
JP (1) JPH11132305A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1477707A1 (en) * 2003-05-16 2004-11-17 Umbra Cuscinetti S.p.A. Ball screw
JP2008121857A (en) * 2006-11-15 2008-05-29 Ntn Corp Motor-driven linear-motion actuator and motor-driven brake device
US8091236B2 (en) * 2004-11-29 2012-01-10 Nsk Ltd. Manufacturing method for toothed power transmission member having oil reservoir and toothed power transmission member manufactured by this manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1477707A1 (en) * 2003-05-16 2004-11-17 Umbra Cuscinetti S.p.A. Ball screw
US8091236B2 (en) * 2004-11-29 2012-01-10 Nsk Ltd. Manufacturing method for toothed power transmission member having oil reservoir and toothed power transmission member manufactured by this manufacturing method
JP2008121857A (en) * 2006-11-15 2008-05-29 Ntn Corp Motor-driven linear-motion actuator and motor-driven brake device

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