JP2009204091A - Ball screw device - Google Patents

Ball screw device Download PDF

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JP2009204091A
JP2009204091A JP2008047634A JP2008047634A JP2009204091A JP 2009204091 A JP2009204091 A JP 2009204091A JP 2008047634 A JP2008047634 A JP 2008047634A JP 2008047634 A JP2008047634 A JP 2008047634A JP 2009204091 A JP2009204091 A JP 2009204091A
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screw
screw shaft
peripheral surface
nut
outer peripheral
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JP5092796B2 (en
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Kazunari Miyazaki
一成 宮崎
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NSK Ltd
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball screw device capable of incorporating an end deflector into both ends in the axial direction of a nut in a state of inserting a screw shaft into the nut without forming a tongue separately from the end deflector, even if a screw groove formed on an outer peripheral surface of the screw shaft is an upward cut screw groove. <P>SOLUTION: An upward cut part of the screw groove 3 is formed as a shaft 8 having an outer diameter not larger than a major diameter of the screw shaft 1 and having the shaft length longer than a width of the tongue 7 formed in the end deflector 6 so that the screw groove 3 formed on the outer peripheral surface of the screw shaft 1 becomes a cut-though screw groove. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ナットの軸方向両端部にエンドデフレクタを有するボールねじ装置に関する。   The present invention relates to a ball screw device having end deflectors at both axial end portions of a nut.

ナットの軸方向両端部にエンドデフレクタを有するボールねじ装置としては、従来、特許文献１に記載されたものが知られている。この種のボールねじ装置は、図６に示すように、ねじ軸１と、このねじ軸１の外周面と対向する内周面を有するナット２と、ねじ軸１の外周面に形成されたねじ溝３とナット２の内周面に形成されたねじ溝４との間を転動する多数のボール５とを具備しており、ナット２の軸方向両端部には、ボール５を無限循環させるためのエンドデフレクタ６が組み込まれている。このエンドデフレクタ６はナット２の内周面から突出するタング７を有しており、ねじ溝３とねじ溝４との間を転動したボール５はエンドデフレクタ６のタング７によってねじ軸１のねじ溝３内からすくい上げられた後、ナット２のボール戻し通路（図示せず）に導入されるようになっている。   As a ball screw device having end deflectors at both ends in the axial direction of the nut, a device described in Patent Document 1 has been known. As shown in FIG. 6, this type of ball screw device includes a screw shaft 1, a nut 2 having an inner peripheral surface facing the outer peripheral surface of the screw shaft 1, and a screw formed on the outer peripheral surface of the screw shaft 1. A plurality of balls 5 that roll between the grooves 3 and the thread grooves 4 formed on the inner peripheral surface of the nut 2 are provided, and the balls 5 are endlessly circulated at both axial ends of the nut 2. An end deflector 6 is incorporated. The end deflector 6 has a tongue 7 protruding from the inner peripheral surface of the nut 2, and the ball 5 rolling between the screw groove 3 and the screw groove 4 is formed on the screw shaft 1 by the tongue 7 of the end deflector 6. After being scooped up from the inside of the thread groove 3, it is introduced into a ball return passage (not shown) of the nut 2.

このようなボールねじ装置は、ねじ軸の外周面に形成されたねじ溝が切り通しのねじ溝である場合には、ナットにねじ軸を挿入した状態でエンドデフレクタをナットの軸方向両端部に組み込むことができるが、ねじ軸の外周面に形成されたねじ溝が切り上がりのねじ溝である場合には、エンドデフレクタに形成されたタングがねじ溝の切り上がり部と干渉してしまうため、ねじ軸をナットに挿入した状態でエンドデフレクタをナットの軸方向両端部に組み込むことができないという不具合がある。そこで、タングをエンドデフレクタと別体に形成し、ナットの軸方向両端部にエンドデフレクタとタングを別々に組み込めるようにしたものが考案されている（例えば、特許文献２参照）。
特開２００３−３２９０９８号公報 特開２００４−２７０７９１号公報 In such a ball screw device, when the thread groove formed on the outer peripheral surface of the screw shaft is a cut-through thread groove, the end deflectors are assembled at both ends of the nut in the axial direction with the screw shaft inserted. However, when the thread groove formed on the outer peripheral surface of the screw shaft is a rounded thread groove, the tongue formed on the end deflector interferes with the rounded portion of the thread groove. There is a problem that the end deflector cannot be incorporated into both ends of the nut in the axial direction with the shaft inserted into the nut. In view of this, it has been devised that the tongue is formed separately from the end deflector so that the end deflector and the tongue can be separately incorporated at both ends of the nut in the axial direction (see, for example, Patent Document 2).
JP 2003-329098 A Japanese Patent Laid-Open No. 2004-270791

しかしながら、特許文献２に記載されたものでは、タングをエンドデフレクタと別体に形成しなければならないため、コストの上昇などを招くという問題があった。
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、ねじ軸の外周面に形成されたねじ溝が切り上がりのねじ溝である場合でもタングをエンドデフレクタと別体に形成したりすることなくねじ軸をナットに挿入した状態でエンドデフレクタをナットの軸方向両端部に組み込むことのできるボールねじ装置を提供することにある。 However, the one described in Patent Document 2 has a problem that the tongue has to be formed separately from the end deflector, resulting in an increase in cost.
The present invention has been made paying attention to the above-mentioned problems, and its purpose is to separate the tongue from the end deflector even when the screw groove formed on the outer peripheral surface of the screw shaft is a rounded screw groove. An object of the present invention is to provide a ball screw device in which an end deflector can be incorporated at both axial ends of a nut in a state where the screw shaft is inserted into the nut without being formed.

上記の目的を達成するために、請求項１記載の発明に係るボールねじ装置は、ねじ軸の外周面に形成されたねじ溝とナットの内周面に形成されたねじ溝との間を転動するボールを無限循環させるためのエンドデフレタをナットの軸方向両端部に具備し、前記ねじ軸の外周面に形成されたねじ溝が前記ねじ軸の両端部に切り上がり部を有するボールねじ装置において、前記ねじ軸の外周面に形成されたねじ溝の前記切り上がり部を、前記ねじ軸の谷径以下の外径を有し且つ前記エンドデフレクタに形成されたタングの幅より大きい軸長を有する軸部としたことを特徴とする。   In order to achieve the above object, a ball screw device according to a first aspect of the present invention rolls between a screw groove formed on the outer peripheral surface of the screw shaft and a screw groove formed on the inner peripheral surface of the nut. In a ball screw device comprising end deflectors for infinite circulation of a moving ball at both axial end portions of a nut, and screw grooves formed on an outer peripheral surface of the screw shaft having rounded portions at both end portions of the screw shaft The raised portion of the thread groove formed on the outer peripheral surface of the screw shaft has an outer diameter equal to or less than the root diameter of the screw shaft and an axial length larger than the width of the tongue formed on the end deflector. It is characterized by having a shaft part.

請求項２記載の発明に係るボールねじ装置は、請求項１記載のボールねじ装置において、前記軸部の半径を前記ねじ軸の中心から前記タングまでの径方向距離より小さくしたことを特徴とする。
請求項３記載の発明に係るボールねじ装置は、ねじ軸の外周面に形成されたねじ溝とナットの内周面に形成されたねじ溝との間を転動するボールを無限循環させるためのエンドデフレタをナットの軸方向両端部に具備し、前記ねじ軸の外周面に形成されたねじ溝が前記ねじ軸の両端部で切り上がっているボールねじ装置において、前記ねじ軸の外周面に形成されたねじ溝の切り上がり部分を平らに切り欠いて形成された平面部を前記ねじ軸の両端部に設けたことを特徴とする。 A ball screw device according to a second aspect of the present invention is the ball screw device according to the first aspect, wherein a radius of the shaft portion is made smaller than a radial distance from the center of the screw shaft to the tongue. .
According to a third aspect of the present invention, there is provided a ball screw device for infinite circulation of a ball rolling between a screw groove formed on an outer peripheral surface of a screw shaft and a screw groove formed on an inner peripheral surface of a nut. In a ball screw device in which end deflectors are provided at both ends of the nut in the axial direction and thread grooves formed on the outer peripheral surface of the screw shaft are rounded up at both ends of the screw shaft, the ball is formed on the outer peripheral surface of the screw shaft. Further, the present invention is characterized in that flat portions formed by flatly cutting off the raised portions of the thread grooves are provided at both ends of the screw shaft.

請求項４記載の発明に係るボールねじ装置は、ねじ軸の外周面に形成されたねじ溝とナットの内周面に形成されたねじ溝との間を転動するボールを無限循環させるためのエンドデフレタをナットの軸方向両端部に具備し、前記ねじ軸の外周面に形成されたねじ溝が前記ねじ軸の両端部に切り上がり部を有するボールねじ装置において、前記ねじ軸の外周面に形成されたねじ溝と同等以下の深さを有し且つ前記エンドデフレクタに形成されたタングより大きい底面積を有する穴部を前記切り上がり部に設けたことを特徴とする。   According to a fourth aspect of the present invention, there is provided a ball screw device for infinite circulation of a ball rolling between a screw groove formed on an outer peripheral surface of a screw shaft and a screw groove formed on an inner peripheral surface of a nut. In a ball screw device having end deflators at both axial end portions of the nut, and thread grooves formed on the outer peripheral surface of the screw shaft having rounded portions at both end portions of the screw shaft, formed on the outer peripheral surface of the screw shaft. A hole portion having a depth equal to or less than that of the formed screw groove and having a bottom area larger than a tongue formed in the end deflector is provided in the raised portion.

請求項１〜４記載の発明に係るボールねじ装置によれば、ねじ軸の外周面に形成されたねじ溝が切り通しのねじ溝となり、ねじ軸をナットに挿入した状態でエンドデフレクタをナットの軸方向両端部に組み込むときに、エンドデフレクタに形成されたタングがねじ溝の切り上がり部に干渉することがないので、ねじ軸の外周面に形成されたねじ溝が切り上がりのねじ溝である場合でもタングをエンドデフレクタと別体に形成したりすることなくねじ軸をナットに挿入した状態でエンドデフレクタをナットの軸方向両端部に組み込むことができる。   According to the ball screw device of the first to fourth aspects of the present invention, the thread groove formed on the outer peripheral surface of the screw shaft becomes a through thread groove, and the end deflector is inserted into the nut while the screw shaft is inserted into the nut. When the tongue formed on the end deflector does not interfere with the raised part of the thread groove when assembled at both ends in the direction, the thread groove formed on the outer peripheral surface of the screw shaft is a raised thread groove However, the end deflector can be incorporated into both ends of the nut in the axial direction with the screw shaft inserted into the nut without forming the tongue separately from the end deflector.

以下、本発明に係るボールねじ装置を図面に基づいて説明する。図１は本発明の第１の実施形態に係るボールねじ装置のねじ軸端部を示す図、図２は第１の実施形態に係るボールねじ装置のエンドデフレクタを示す図であり、図１に示されるように、第１の実施形態に係るボールねじ装置のねじ軸１はねじ溝３を外周面に有している。このねじ溝３はねじ軸１の両端部に切り上がり部を有しており、ねじ溝３の切り上がり部は、ねじ軸１の谷径をｄ０--、エンドデフレクタ６（図２参照）に形成されたタング７の幅をｘ０とすると、ｄ０以下の外径ｄ（ｄ≦ｄ０）を有し且つｘ０より大きい軸長ｘ（ｘ＞ｘ０）を有する軸部８となっている。また、ねじ軸１の中心からタング７までの径方向距離（タング内接円半径）をｒ０とすると、軸部８の半径ｒ１はｒ１≦ｒ０となっている。 Hereinafter, a ball screw device according to the present invention will be described with reference to the drawings. 1 is a view showing a screw shaft end portion of a ball screw device according to a first embodiment of the present invention, and FIG. 2 is a view showing an end deflector of the ball screw device according to the first embodiment. As shown, the screw shaft 1 of the ball screw device according to the first embodiment has a thread groove 3 on the outer peripheral surface. The thread groove 3 has a rounded portion at both ends of the screw shaft 1, and the rounded portion of the screw groove 3 has a root diameter of the screw shaft 1 as d 0− , and an end deflector 6 (see FIG. 2). When the formed width of the tongue 7 in the x 0, a shank 8 having a d 0 or less of the outer diameter d (d ≦ d 0) has and x 0 is greater than the axial length x (x> x 0) It has become. When the radial distance (tang inscribed circle radius) from the center of the screw shaft 1 to the tongue 7 is r 0 , the radius r 1 of the shaft portion 8 is r 1 ≦ r 0 .

上述した第１の実施形態のように、ねじ溝３の切り上がり部をねじ軸１の谷径ｄ０以下の外径ｄを有し且つタング７の幅ｘ０より大きい軸長ｘを有する軸部８にすると、図１に示すように、ねじ軸１の外周面に形成されたねじ溝３が切り通しのねじ溝となる。これにより、ねじ軸１をナット２に挿入した状態でエンドデフレクタ６をナット２の軸方向両端部に組み込むときに、エンドデフレクタ６に形成されたタング７がねじ溝３の切り上がり部に干渉することがないので、ねじ軸１の外周面に形成されたねじ溝３が切り上がりのねじ溝である場合でもタング７をエンドデフレクタ６と別体に形成したりすることなくねじ軸１をナット２に挿入した状態でエンドデフレクタ６をナット２の軸方向両端部に組み込むことができる。 As in the first embodiment described above, the rounded portion of the screw groove 3 has an outer diameter d equal to or less than the root diameter d 0 of the screw shaft 1 and an axial length x greater than the width x 0 of the tongue 7. As shown in FIG. 1, as shown in FIG. 1, the thread groove 3 formed on the outer peripheral surface of the screw shaft 1 becomes a cut-through thread groove. Accordingly, when the end deflector 6 is assembled at both axial ends of the nut 2 with the screw shaft 1 inserted into the nut 2, the tongue 7 formed on the end deflector 6 interferes with the raised portion of the screw groove 3. Therefore, even when the screw groove 3 formed on the outer peripheral surface of the screw shaft 1 is a rounded screw groove, the screw shaft 1 is attached to the nut 2 without forming the tongue 7 separately from the end deflector 6. The end deflector 6 can be incorporated into both end portions of the nut 2 in the axial direction in a state of being inserted into the nut 2.

図３は本発明の第２の実施形態に係るボールねじ装置のねじ軸とエンドデフレクタを示す図であり、第２の実施形態が第１の実施形態と異なる点は、ねじ軸１が両端部にフランジ部１ａを有する点である。
図４は本発明の第３の実施形態に係るボールねじ装置のねじ軸とエンドデフレクタを示す図であり、同図に示されるように、第３の実施形態に係るボールねじ装置のねじ軸１はねじ溝３を外周面に有している。このねじ溝３はねじ軸１の両端部で切り上がっており、ねじ軸１の両端部には、方形状の平面部９が設けられている。この平面部９はねじ溝３の切り上がり部分を平らに切り欠いて形成されており、ねじ軸１の軸方向に沿う平面部９の長さＬ１、エンドデフレクタ６に形成されたタング７の幅をｘ０とすると、Ｌ１＞ｘ０となっている。 FIG. 3 is a view showing a screw shaft and an end deflector of a ball screw device according to a second embodiment of the present invention. The second embodiment is different from the first embodiment in that the screw shaft 1 has both end portions. It is a point which has the flange part 1a.
FIG. 4 is a view showing a screw shaft and an end deflector of a ball screw device according to a third embodiment of the present invention. As shown in FIG. 4, the screw shaft 1 of the ball screw device according to the third embodiment is shown. Has a thread groove 3 on its outer peripheral surface. The screw groove 3 is rounded up at both ends of the screw shaft 1, and square flat portions 9 are provided at both ends of the screw shaft 1. This flat portion 9 is formed by cutting out the raised portion of the screw groove 3 flatly. The length L 1 of the flat portion 9 along the axial direction of the screw shaft 1 and the tongue 7 formed on the end deflector 6 are and the width and x 0, and has a L 1> x 0.

このような平面部９をねじ軸１の両端部に設けると、図４に示すように、ねじ軸１の外周面に形成されたねじ溝３が切り通しのねじ溝となる。これにより、ねじ軸１をナット２に挿入した状態でエンドデフレクタ６をナット２の軸方向両端部に組み込むときに、エンドデフレクタ６に形成されたタング７がねじ溝３の切り上がり部に干渉することがないので、ねじ軸１の外周面に形成されたねじ溝３が切り上がりのねじ溝である場合でもタング７をエンドデフレクタ６と別体に形成したりすることなくねじ軸１をナット２に挿入した状態でエンドデフレクタ６をナット２の軸方向両端部に組み込むことができる。   When such flat portions 9 are provided at both ends of the screw shaft 1, as shown in FIG. 4, the screw grooves 3 formed on the outer peripheral surface of the screw shaft 1 become cut-through screw grooves. Accordingly, when the end deflector 6 is assembled at both axial ends of the nut 2 with the screw shaft 1 inserted into the nut 2, the tongue 7 formed on the end deflector 6 interferes with the raised portion of the screw groove 3. Therefore, even when the screw groove 3 formed on the outer peripheral surface of the screw shaft 1 is a rounded screw groove, the screw shaft 1 is attached to the nut 2 without forming the tongue 7 separately from the end deflector 6. The end deflector 6 can be incorporated into both end portions of the nut 2 in the axial direction in a state of being inserted into the nut 2.

図５は本発明の第４の実施形態に係るボールねじ装置のねじ軸とエンドデフレクタを示す図であり、同図に示されるように、第３の実施形態に係るボールねじ装置のねじ軸１はねじ溝３を外周面に有している。このねじ溝３はねじ軸１の両端部に切り上がり部を有しており、ねじ溝３の切り上がり部には、ねじ溝３より深い深さを有し且つエンドデフレクタ７に形成されたタング８より大きい底面積を有する穴部１０が設けられている。   FIG. 5 is a view showing a screw shaft and an end deflector of a ball screw device according to a fourth embodiment of the present invention. As shown in FIG. 5, the screw shaft 1 of the ball screw device according to the third embodiment is shown. Has a thread groove 3 on its outer peripheral surface. The thread groove 3 has a raised portion at both ends of the screw shaft 1, and the raised portion of the thread groove 3 has a deeper depth than the thread groove 3 and is formed on the end deflector 7. A hole 10 having a bottom area greater than 8 is provided.

このような穴部１０をねじ溝３の切り上がり部に設けると、ねじ軸１の外周面に形成されたねじ溝３が切り通しのねじ溝となる。これにより、ねじ軸１をナット２に挿入した状態でエンドデフレクタ６をナット２の軸方向両端部に組み込むときに、エンドデフレクタ６に形成されたタング７がねじ溝３の切り上がり部に干渉することがないので、ねじ軸１の外周面に形成されたねじ溝３が切り上がりのねじ溝である場合でもタング７をエンドデフレクタ６と別体に形成したりすることなくねじ軸１をナット２に挿入した状態でエンドデフレクタ６をナット２の軸方向両端部に組み込むことができる。
上述した第３の実施形態では、外形形状が円形の穴部１０を例示したが、穴部１０の外形形状は特に限定されるものではなく、例えば長円形状や角形形状であってもよい。 When such a hole 10 is provided in the cut-up portion of the screw groove 3, the screw groove 3 formed on the outer peripheral surface of the screw shaft 1 becomes a through-thread groove. Accordingly, when the end deflector 6 is assembled at both axial ends of the nut 2 with the screw shaft 1 inserted into the nut 2, the tongue 7 formed on the end deflector 6 interferes with the raised portion of the screw groove 3. Therefore, even if the screw groove 3 formed on the outer peripheral surface of the screw shaft 1 is a rounded screw groove, the screw shaft 1 is attached to the nut 2 without forming the tongue 7 separately from the end deflector 6. The end deflector 6 can be incorporated into both end portions of the nut 2 in the axial direction in a state of being inserted into the nut 2.
In the above-described third embodiment, the hole 10 having a circular outer shape is illustrated, but the outer shape of the hole 10 is not particularly limited, and may be, for example, an oval shape or a square shape.

本発明の第１の実施形態に係るボールねじ装置のねじ軸端部を示す図である。It is a figure which shows the screw-shaft end part 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エンドデフレクタを示す図である。It is a figure which shows the end deflector of the ball screw apparatus which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係るボールねじ装置のねじ軸とエンドデフレクタを示す図である。It is a figure which shows the screw axis | shaft and end deflector of the ball screw apparatus which concern on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係るボールねじ装置のねじ軸とエンドデフレクタを示す図である。It is a figure showing a screw axis and an end deflector of a ball screw device concerning a 3rd embodiment of the present invention. 本発明の第４の実施形態に係るボールねじ装置のねじ軸とエンドデフレクタを示す図である。It is a figure showing a screw axis and an end deflector of a ball screw device concerning a 4th embodiment of the present invention. 従来のボールねじ装置の一例を示す図である。It is a figure which shows an example of the conventional ball screw apparatus.

符号の説明Explanation of symbols

１ ねじ軸
２ ナット
３，４ ねじ溝
５ ボール
６ エンドデフレクタ
７ タング
８ 軸部
９ 平面部
１０ 穴部 DESCRIPTION OF SYMBOLS 1 Screw shaft 2 Nut 3, 4 Thread groove 5 Ball 6 End deflector 7 Tongue 8 Shaft part 9 Flat part 10 Hole part

Claims (4)

ねじ軸の外周面に形成されたねじ溝とナットの内周面に形成されたねじ溝との間を転動するボールを無限循環させるためのエンドデフレタをナットの軸方向両端部に具備し、前記ねじ軸の外周面に形成されたねじ溝が前記ねじ軸の両端部に切り上がり部を有するボールねじ装置において、
前記ねじ軸の外周面に形成されたねじ溝の前記切り上がり部を、前記ねじ軸の谷径以下の外径を有し且つ前記エンドデフレクタに形成されたタングの幅より大きい軸長を有する軸部としたことを特徴とするボールねじ装置。 End deflectors for infinite circulation of balls that roll between the thread grooves formed on the outer peripheral surface of the screw shaft and the thread grooves formed on the inner peripheral surface of the nut are provided at both ends in the axial direction of the nut, In the ball screw device in which the thread groove formed on the outer peripheral surface of the screw shaft has a rounded-up portion at both ends of the screw shaft,
The shaft having an outer diameter equal to or less than the root diameter of the screw shaft and an axial length larger than the width of the tongue formed on the end deflector, with the raised portion of the screw groove formed on the outer peripheral surface of the screw shaft. A ball screw device characterized by being a part. 請求項１記載のボールねじ装置において、前記軸部の半径を前記ねじ軸の中心から前記タングまでの径方向距離より小さくしたことを特徴とするボールねじ装置。   2. The ball screw device according to claim 1, wherein a radius of the shaft portion is smaller than a radial distance from a center of the screw shaft to the tongue. ねじ軸の外周面に形成されたねじ溝とナットの内周面に形成されたねじ溝との間を転動するボールを無限循環させるためのエンドデフレタをナットの軸方向両端部に具備し、前記ねじ軸の外周面に形成されたねじ溝が前記ねじ軸の両端部で切り上がっているボールねじ装置において、
前記ねじ軸の外周面に形成されたねじ溝の切り上がり部分を平らに切り欠いて形成された平面部を前記ねじ軸の両端部に設けたことを特徴とするボールねじ装置。 End deflectors for infinite circulation of balls that roll between the thread grooves formed on the outer peripheral surface of the screw shaft and the thread grooves formed on the inner peripheral surface of the nut are provided at both ends in the axial direction of the nut, In the ball screw device in which the thread groove formed on the outer peripheral surface of the screw shaft is rounded up at both ends of the screw shaft,
2. A ball screw device according to claim 1, wherein flat portions formed by flattening off a raised portion of a screw groove formed on an outer peripheral surface of the screw shaft are provided at both ends of the screw shaft. ねじ軸の外周面に形成されたねじ溝とナットの内周面に形成されたねじ溝との間を転動するボールを無限循環させるためのエンドデフレタをナットの軸方向両端部に具備し、前記ねじ軸の外周面に形成されたねじ溝が前記ねじ軸の両端部に切り上がり部を有するボールねじ装置において、
前記ねじ軸の外周面に形成されたねじ溝と同等以下の深さを有し且つ前記エンドデフレクタに形成されたタングより大きい底面積を有する穴部を前記切り上がり部に設けたことを特徴とするボールねじ装置。 End deflectors for infinite circulation of balls that roll between the thread grooves formed on the outer peripheral surface of the screw shaft and the thread grooves formed on the inner peripheral surface of the nut are provided at both ends in the axial direction of the nut, In the ball screw device in which the thread groove formed on the outer peripheral surface of the screw shaft has a rounded-up portion at both ends of the screw shaft,
A hole having a depth equal to or less than a screw groove formed on an outer peripheral surface of the screw shaft and having a bottom area larger than a tongue formed in the end deflector is provided in the raised portion. Ball screw device to do.
JP2008047634A 2008-02-28 2008-02-28 Ball screw device Expired - Fee Related JP5092796B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015159508A1 (en) * 2014-04-14 2015-10-22 日本精工株式会社 Ball screw

Citations (1)

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JP2007247659A (en) * 2006-03-13 2007-09-27 Shangyin Sci & Technol Co Ltd Ball screw combining device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007247659A (en) * 2006-03-13 2007-09-27 Shangyin Sci & Technol Co Ltd Ball screw combining device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015159508A1 (en) * 2014-04-14 2015-10-22 日本精工株式会社 Ball screw
CN106133396A (en) * 2014-04-14 2016-11-16 日本精工株式会社 Ball-screw
TWI568955B (en) * 2014-04-14 2017-02-01 Nsk Ltd Ball screw
JPWO2015159508A1 (en) * 2014-04-14 2017-04-13 日本精工株式会社 Ball screw
CN106133396B (en) * 2014-04-14 2018-09-14 日本精工株式会社 Ball-screw

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