JP2007232051A - Ball screw device - Google Patents

Ball screw device Download PDF

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Publication number
JP2007232051A
JP2007232051A JP2006053081A JP2006053081A JP2007232051A JP 2007232051 A JP2007232051 A JP 2007232051A JP 2006053081 A JP2006053081 A JP 2006053081A JP 2006053081 A JP2006053081 A JP 2006053081A JP 2007232051 A JP2007232051 A JP 2007232051A
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Prior art keywords
peripheral surface
nut
fitting portion
ball screw
screw shaft
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JP2006053081A
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JP4923624B2 (en
Inventor
Daisuke Kuroiwa
大輔 黒岩
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/24—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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball screw device for preventing the entry of dust into a nut without increasing operating torque. <P>SOLUTION: The ball screw device comprises a wiper seal 14 consisting of a cylindrical fitted portion 14a to be fitted to the inner peripheral face of the nut and a wiper seal portion 14b resin-molded integrally with the fitted portion 14a, for preventing the entry of dust into the nut. The inner diameter of the fitted portion 14a is larger than the inner diameter of the wiper seal portion 14b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、回転運動を直線運動に変換するボールねじ装置に関し、特に、ナット内への粉塵の侵入を防止する防塵部材を備えたボールねじ装置に関する。   The present invention relates to a ball screw device that converts rotational motion into linear motion, and more particularly to a ball screw device that includes a dust-proof member that prevents dust from entering a nut.

回転運動を直線運動に変換するボールねじ装置は、一般に、ねじ軸と、このねじ軸の外径より大きい内径で筒状に形成されたナットとを備えており、ねじ軸の外周面に形成されたボールねじ溝とナットの内周面に形成されたボールねじ溝との間には、ねじ軸及びナットの両ボールねじ溝間をねじ軸またはナットの回転運動に伴って転動する多数のボールが設けられている。   A ball screw device that converts rotational motion into linear motion generally includes a screw shaft and a nut formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft, and is formed on the outer peripheral surface of the screw shaft. Between the ball screw groove formed on the inner peripheral surface of the nut and the ball screw groove formed on the inner peripheral surface of the nut, a number of balls that roll between the ball screw grooves of the screw shaft and the nut as the screw shaft or nut rotates. Is provided.

このようなボールねじ装置を例えば工作機械で使用する場合は、ナット内に切削屑などの粉塵が侵入するとボールの転がり運動が阻害されるため、ナット内に粉塵が侵入しないようにする必要がある。そこで、図６に示すような防塵部材１、すなわちナットの内周面に嵌合する円筒状の嵌合部１ａと、この嵌合部１ａと一体に樹脂成形された円筒状のワイパーシール部１ｂとからなる防塵部材１をナットの端部に装着してナット内への粉塵の侵入を防止するようにしたものがある（例えば、特許文献１）。
特開２００２−３６４７２６号公報（図８、図９） When such a ball screw device is used in a machine tool, for example, if dust such as cutting waste enters the nut, the rolling motion of the ball is inhibited, so it is necessary to prevent dust from entering the nut. . Therefore, a dustproof member 1 as shown in FIG. 6, that is, a cylindrical fitting portion 1a fitted to the inner peripheral surface of the nut, and a cylindrical wiper seal portion 1b molded integrally with the fitting portion 1a by resin. A dustproof member 1 consisting of the following is attached to the end of the nut to prevent dust from entering the nut (for example, Patent Document 1).
JP 2002-364726 A (FIGS. 8 and 9)

このようなボールねじ装置は防塵部材の内径がねじ軸の外径よりも０．１〜０．４ｍｍ程度大きいため、通常は、防塵部材の内周面がねじ軸の外周面に接触することはないが、防錆油などの油がねじ軸やナットに付着していると、これを吸収することによって防塵部材が膨潤する。この場合、防塵部材のワイパーシール部がガータースプリングによりねじ軸の外周面に締め付けられていると、ナット内に嵌め込まれている防塵部材の嵌合部が逃げ場を失うことによってねじ軸外周面に接触し、その結果、ボールねじ装置の作動トルク（ねじ軸やナットを回転させるためのトルク）を増大させるおそれがあった。また、防塵部材の嵌合部はシールとして機能していないが、ねじ軸との隙間に油やグリースが介在することにより動トルクを発生させる原因となっていた。
本発明は上述した問題点に着目してなされたものであり、その目的は、作動トルクを増大させることなくナット内への粉塵の侵入を防止することのできるボールねじ装置を提供することにある。 In such a ball screw device, since the inner diameter of the dust-proof member is about 0.1 to 0.4 mm larger than the outer diameter of the screw shaft, the inner peripheral surface of the dust-proof member normally contacts the outer peripheral surface of the screw shaft. However, if oil such as rust preventive oil adheres to the screw shaft or nut, the dustproof member swells by absorbing it. In this case, if the wiper seal part of the dust-proof member is tightened to the outer peripheral surface of the screw shaft by the garter spring, the fitting part of the dust-proof member fitted in the nut loses the clearance and contacts the outer peripheral surface of the screw shaft. As a result, there is a risk of increasing the operating torque of the ball screw device (torque for rotating the screw shaft and nut). Moreover, although the fitting part of the dust-proof member does not function as a seal, oil or grease is present in the gap with the screw shaft, causing dynamic torque.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a ball screw device that can prevent dust from entering the nut without increasing the operating torque. .

上記課題を解決するために、請求項１の発明は、ねじ軸と、該ねじ軸の外径より大きい内径で筒状に形成されたナットと、前記ねじ軸の外周面に形成されたボールねじ溝と前記ナットの内周面に形成されたボールねじ溝との間に設けられた多数のボールと、前記ナットの端部に装着された防塵部材とを備えてなり、前記防塵部材が前記ナットの内周面に嵌合する円筒状の嵌合部と、該嵌合部と一体に樹脂成形された円筒状のワイパーシール部とからなるボールねじ装置において、前記嵌合部の内径を前記ワイパーシール部の内径より大きくしたことを特徴とする。   In order to solve the above problems, the invention of claim 1 is directed to a screw shaft, a nut formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft, and a ball screw formed on an outer peripheral surface of the screw shaft. A plurality of balls provided between the groove and a ball screw groove formed on the inner peripheral surface of the nut, and a dustproof member attached to an end of the nut, wherein the dustproof member is the nut In a ball screw device comprising a cylindrical fitting portion that fits to the inner peripheral surface of the cylindrical member, and a cylindrical wiper seal portion that is resin-molded integrally with the fitting portion, the inner diameter of the fitting portion is the wiper It is characterized by being larger than the inner diameter of the seal portion.

請求項２の発明は、請求項１記載のボールねじ装置において、前記ねじ軸の外径をＡ、前記ナットの内径をＧ、前記嵌合部の内径をＣ、前記ワイパーシール部の内径をＢとしたとき、前記ワイパーシール部の内径と前記嵌合部の内径との差が
（Ｇ−Ｂ）×０．０８≦Ｂ−Ｃ≦（Ｇ−Ｂ）×０．１５
但し、Ａ＋０．１ｍｍ≦Ｂ≦Ａ＋０．４ｍｍ
であることを特徴とする。
請求項３の発明は、請求項２記載のボールねじ装置において、前記ねじ軸の軸方向に沿う前記嵌合部の外周面の長さをＥ、前記ねじ軸の軸方向に沿う前記嵌合部の内周面の長さをＤとしたとき、前記嵌合部の外周面の長さと前記嵌合部の内周面の長さとの関係がＥ≦Ｄであることを特徴とする。 According to a second aspect of the present invention, in the ball screw device according to the first aspect, the outer diameter of the screw shaft is A, the inner diameter of the nut is G, the inner diameter of the fitting portion is C, and the inner diameter of the wiper seal portion is B. The difference between the inner diameter of the wiper seal portion and the inner diameter of the fitting portion is (GB) × 0.08 ≦ BC− (GB) × 0.15.
However, A + 0.1mm ≦ B ≦ A + 0.4mm
It is characterized by being.
According to a third aspect of the present invention, in the ball screw device according to the second aspect, the length of the outer peripheral surface of the fitting portion along the axial direction of the screw shaft is E, and the fitting portion is along the axial direction of the screw shaft. When the length of the inner peripheral surface is D, the relationship between the length of the outer peripheral surface of the fitting portion and the length of the inner peripheral surface of the fitting portion is E ≦ D.

本発明に係るボールねじ装置によれば、嵌合部の内径をワイパーシール部の内径より大きくしたことで、ねじ軸の外周面と嵌合部の内周面との間に形成される隙間がねじ軸の外周面と嵌合部のワイパーシール部の内周面との間に形成される隙間よりも大きな隙間となる。これにより、ねじ軸に付着した防錆油等の油によって防塵部材が膨潤しても嵌合部の内周面がねじ軸の外周面に接触することがないので、作動トルクを増大させることなくナット内への粉塵の侵入を防止することができる。   According to the ball screw device according to the present invention, the gap formed between the outer peripheral surface of the screw shaft and the inner peripheral surface of the fitting portion is increased by making the inner diameter of the fitting portion larger than the inner diameter of the wiper seal portion. The gap is larger than the gap formed between the outer peripheral surface of the screw shaft and the inner peripheral surface of the wiper seal portion of the fitting portion. As a result, even if the dust-proof member swells due to oil such as rust-preventing oil attached to the screw shaft, the inner peripheral surface of the fitting portion does not contact the outer peripheral surface of the screw shaft without increasing the operating torque. Intrusion of dust into the nut can be prevented.

以下、図１〜図５を参照して本発明の第１の実施形態について説明する。
本発明の第１の実施形態に係るボールねじ装置を図1に示す。同図に示されるボールねじ装置１０は、ねじ軸１１と、このねじ軸１１の外径より大きい内径で筒状に形成されたナット１２とを備えており、ねじ軸１１の外周面に形成されたボールねじ溝１１ａとナット１２の内周面に形成されたボールねじ溝１２ａとの間には多数のボール１３が設けられている。これらのボール１３はねじ軸１１またはナット１２の回転運動に伴ってボールねじ溝１１ａ，１２ａ間を転動するようになっており、ナット１２の両端部には、ボール１３のスムーズな転がり運動を確保するために、図２〜図4に示すような構造のワイパーシール１４がナット１２内への粉塵の侵入を防止する防塵部材として装着されている。 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a ball screw device according to a first embodiment of the present invention. The ball screw device 10 shown in the figure includes a screw shaft 11 and a nut 12 formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft 11, and is formed on the outer peripheral surface of the screw shaft 11. A large number of balls 13 are provided between the ball screw groove 11 a and the ball screw groove 12 a formed on the inner peripheral surface of the nut 12. These balls 13 roll between the ball screw grooves 11a and 12a in accordance with the rotational movement of the screw shaft 11 or the nut 12, and the balls 13 are smoothly rolled on both ends of the nut 12. In order to ensure, a wiper seal 14 having a structure as shown in FIGS. 2 to 4 is mounted as a dust-proof member for preventing dust from entering the nut 12.

ワイパーシール１４は円筒状の嵌合部１４ａと、この嵌合部１４ａと一体に樹脂成形された円筒状のワイパーシール部１４ｂとからなり、ワイパーシール部１４ｂの内周面には、ねじ軸１１の外周面に形成されたボールねじ溝１１ａに摺動自在に嵌合する螺旋状突起部１４ｃが形成されている。
嵌合部１４ａの外周面はナット１２の内周面に嵌合しており、ねじ軸１１の外径をＡ、ナット１２の内径をＧ、ワイパーシール部１４ｂの内径をＢとすると、嵌合部１４ａの内径Ｃは、次式（１）の関係を満たす値となっている。
（Ｇ−Ｂ）×０．０８≦（Ｂ−Ｃ）≦（Ｇ−Ｂ）×０．１５ ‥‥（１）
但し、Ａ＋０．１ｍｍ≦Ｂ≦Ａ＋０．４ｍｍ
また、ねじ軸１１の軸方向に沿う嵌合部１４ａの外周面の長さをＥ、ねじ軸１１の軸方向に沿う嵌合部１４ａの内周面の長さをＤとすると、嵌合部１４ａの外周面の長さＥと嵌合部１４ａの内周面の長さＤとの関係は、下式（２）の関係を満たす値となっている。
Ｅ≦Ｄ ‥‥‥（２） The wiper seal 14 includes a cylindrical fitting portion 14a and a cylindrical wiper seal portion 14b formed by resin molding integrally with the fitting portion 14a. The screw shaft 11 is provided on the inner peripheral surface of the wiper seal portion 14b. A helical protrusion 14c is formed that is slidably fitted in a ball screw groove 11a formed on the outer peripheral surface of the screw.
The outer peripheral surface of the fitting portion 14a is fitted to the inner peripheral surface of the nut 12, and the outer diameter of the screw shaft 11 is A, the inner diameter of the nut 12 is G, and the inner diameter of the wiper seal portion 14b is B. The inner diameter C of the portion 14a is a value that satisfies the relationship of the following equation (1).
(GB) × 0.08 ≦ (BC) ≦ (GB) × 0.15 (1)
However, A + 0.1mm ≦ B ≦ A + 0.4mm
Further, when the length of the outer peripheral surface of the fitting portion 14a along the axial direction of the screw shaft 11 is E and the length of the inner peripheral surface of the fitting portion 14a along the axial direction of the screw shaft 11 is D, the fitting portion The relationship between the length E of the outer peripheral surface 14a and the length D of the inner peripheral surface of the fitting portion 14a is a value that satisfies the relationship of the following expression (2).
E ≦ D (2)

なお、嵌合部１４ａの外周面にはワイパーシール１４をナット１２に固定するワイパーシール固定用ねじ１５（図１参照）と係合する複数の抜け止め穴１６が嵌合部１４ａの周方向にほぼ等ピッチで設けられ、ワイパーシール部１４ｂの外周面にはワイパーシール部１４ｂの内周面をねじ軸１１の外周面に締め付けるガータースプリング１７（図１参照）をワイパーシール部１４ｂの外周上に位置決めする位置決め溝１８が設けられている。さらに、ワイパーシール部１４ｂには、ねじ軸１１に付着した防錆油等の油をワイパーシール部１４ｂの外部（外径側）に排出する複数の溝部１９が設けられている。また、螺旋状突起部１４ｃは、図５に示すように、その断面がゴッシクアーク状をなしており、ボールねじ溝１１ａ，１２ａの断面と一致する形状となっている。   A plurality of retaining holes 16 that engage with wiper seal fixing screws 15 (see FIG. 1) for fixing the wiper seal 14 to the nut 12 are provided on the outer peripheral surface of the fitting portion 14a in the circumferential direction of the fitting portion 14a. A garter spring 17 (see FIG. 1) for fastening the inner peripheral surface of the wiper seal portion 14b to the outer peripheral surface of the screw shaft 11 is provided on the outer periphery of the wiper seal portion 14b. A positioning groove 18 for positioning is provided. Further, the wiper seal portion 14b is provided with a plurality of groove portions 19 for discharging oil such as rust preventive oil attached to the screw shaft 11 to the outside (outer diameter side) of the wiper seal portion 14b. Further, as shown in FIG. 5, the spiral projection 14c has a gossip arc shape in cross section, and has a shape that matches the cross section of the ball screw grooves 11a and 12a.

このような構成において、ワイパーシール１４をナット１２の端部に装着すると、ねじ軸１１の外周面と嵌合部１４ａの内周面との間に形成される隙間がねじ軸１１の外周面とワイパーシール部１４ｂの内周面との間に形成される隙間よりも大きな隙間となる。これにより、ねじ軸１１に付着した防錆油等の油によってワイパーシール１４が膨潤しても嵌合部１４ａの内周面がねじ軸１１の外周面に接触することがないので、作動トルクを増大させることなくナット１２内への粉塵の侵入を防止することができる。   In such a configuration, when the wiper seal 14 is attached to the end of the nut 12, a gap formed between the outer peripheral surface of the screw shaft 11 and the inner peripheral surface of the fitting portion 14a is separated from the outer peripheral surface of the screw shaft 11. The gap is larger than the gap formed between the inner peripheral surface of the wiper seal portion 14b. As a result, even if the wiper seal 14 swells due to oil such as rust preventive oil adhered to the screw shaft 11, the inner peripheral surface of the fitting portion 14a does not contact the outer peripheral surface of the screw shaft 11, so that the operating torque is reduced. Intrusion of dust into the nut 12 can be prevented without increasing.

本発明の第１の実施形態に係るボールねじ装置の概略構成を示す図である。It is a figure showing a schematic structure of a ball screw device concerning a 1st embodiment of the present invention. 本発明の第１の実施形態に係るボールねじ装置のワイパーシール（防塵部材）を示す断面図である。It is sectional drawing which shows the wiper seal (dust-proof member) of the ball screw apparatus which concerns on the 1st Embodiment of this invention. 本発明の第１の実施形態に係るボールねじ装置のワイパーシールを示す側面図である。It is a side view which shows the wiper seal of the ball screw apparatus which concerns on the 1st Embodiment of this invention. 本発明の第１の実施形態に係るボールねじ装置のワイパーシールを示す正面である。1 is a front view showing a wiper seal of a ball screw device according to a first embodiment of the present invention. 図２に示す螺旋状突起部の正面図である。It is a front view of the helical protrusion part shown in FIG. 従来のボールねじ装置の防塵部材の一例を示す断面図である。It is sectional drawing which shows an example of the dustproof member of the conventional ball screw apparatus.

符号の説明Explanation of symbols

１１ ねじ軸
１２ ナット
１１ａ，１２ａ ボールねじ溝
１３ ボール
１４ ワイパーシール（防塵部材）
１４ａ 嵌合部
１４ｂ ワイパーシール部
１５ ワイパーシール固定用ねじ
１６ 抜け止め穴
１７ ガータースプリング
１８ 位置決め溝 11 Screw shaft 12 Nut 11a, 12a Ball screw groove 13 Ball 14 Wiper seal (dust-proof member)
14a Fitting portion 14b Wiper seal portion 15 Wiper seal fixing screw 16 Retaining hole 17 Garter spring 18 Positioning groove

Claims (3)

ねじ軸と、該ねじ軸の外径より大きい内径で筒状に形成されたナットと、前記ねじ軸の外周面に形成されたボールねじ溝と前記ナットの内周面に形成されたボールねじ溝との間に設けられた多数のボールと、前記ナットの端部に装着された防塵部材とを備えてなり、前記防塵部材が前記ナットの内周面に嵌合する円筒状の嵌合部と、該嵌合部と一体に樹脂成形された円筒状のワイパーシール部とからなるボールねじ装置において、
前記嵌合部の内径を前記ワイパーシール部の内径より大きくしたことを特徴とするボールねじ装置。 A screw shaft, a nut formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft, a ball screw groove formed on the outer peripheral surface of the screw shaft, and a ball screw groove formed on the inner peripheral surface of the nut A cylindrical fitting portion that includes a plurality of balls provided between the nut and a dust-proof member attached to an end of the nut, and the dust-proof member is fitted to the inner peripheral surface of the nut; In the ball screw device comprising a cylindrical wiper seal portion molded integrally with the fitting portion,
A ball screw device characterized in that an inner diameter of the fitting portion is made larger than an inner diameter of the wiper seal portion. 前記ねじ軸の外径をＡ、前記ナットの内径をＧ、前記嵌合部の内径をＣ、前記ワイパーシール部の内径をＢとしたとき、前記ワイパーシール部の内径と前記嵌合部の内径との差が
（Ｇ−Ｂ）×０．０８≦Ｂ−Ｃ≦（Ｇ−Ｂ）×０．１５
但し、Ａ＋０．１ｍｍ≦Ｂ≦Ａ＋０．４ｍｍ
であることを特徴とする請求項１記載のボールねじ装置。 When the outer diameter of the screw shaft is A, the inner diameter of the nut is G, the inner diameter of the fitting portion is C, and the inner diameter of the wiper seal portion is B, the inner diameter of the wiper seal portion and the inner diameter of the fitting portion And the difference from (GB) × 0.08 ≦ B−C ≦ (GB) × 0.15
However, A + 0.1mm ≦ B ≦ A + 0.4mm
The ball screw device according to claim 1, wherein: 前記ねじ軸の軸方向に沿う前記嵌合部の外周面の長さをＥ、前記ねじ軸の軸方向に沿う前記嵌合部の内周面の長さをＤとしたとき、前記嵌合部の外周面の長さと前記嵌合部の内周面の長さとの関係がＥ≦Ｄであることを特徴とする請求項２記載のボールねじ装置。   When the length of the outer peripheral surface of the fitting portion along the axial direction of the screw shaft is E, and the length of the inner peripheral surface of the fitting portion along the axial direction of the screw shaft is D, the fitting portion The ball screw device according to claim 2, wherein the relationship between the length of the outer peripheral surface of the inner surface and the length of the inner peripheral surface of the fitting portion is E ≦ D.
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KR20150135594A (en) * 2014-05-22 2015-12-03 하이윈 테크놀로지스 코포레이션 Ball screw having wiper
JP2016109189A (en) * 2014-12-04 2016-06-20 日本精工株式会社 Packaging form of direct-acting device, packaged direct-acting device, and packaging method of direct-acting device
CN106926821B (en) * 2017-04-28 2023-05-30 合肥学院 Automobile windscreen wiper
CN106926821A (en) * 2017-04-28 2017-07-07 合肥学院 A kind of vehicle wiper
EP3726098A1 (en) * 2019-04-18 2020-10-21 Goodrich Actuation Systems Limited Lubrication system for ballscrew actuator
US11287027B2 (en) 2019-04-18 2022-03-29 Goodrich Actuation Systems Limited Lubrication system for ballscrew actuator

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