JP2010190361A - Ball screw device - Google Patents

Ball screw device Download PDF

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JP2010190361A
JP2010190361A JP2009036986A JP2009036986A JP2010190361A JP 2010190361 A JP2010190361 A JP 2010190361A JP 2009036986 A JP2009036986 A JP 2009036986A JP 2009036986 A JP2009036986 A JP 2009036986A JP 2010190361 A JP2010190361 A JP 2010190361A
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ball
ball screw
ball nut
peripheral surface
support bearing
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JP2010190361A5 (en
JP5304305B2 (en
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Shingo Saito
伸吾 齋藤
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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 positively preventing the positional deviation of a ball screw without having to secure high dimensional accuracy of an outer fitting part. <P>SOLUTION: The ball screw device 1 includes a ball screw shaft 4 with a male screw groove 3 formed thereon, a ball nut 5 screwed to the male screw groove 3 of the ball screw shaft 4 via a rolling element, and a supporting bearing 24 mounted on the outer peripheral face of the ball nut 5. A rotation drive member 31 to which a rotational force from the outside to the ball nut 5 is transmitted is fitted on the outside of one end side of the ball nut 5 with a strong press-contact force that restricts the axial movement of the supporting bearing 24. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、雄ねじ溝を形成したボールねじ軸と、このボールねじ軸の雄ねじ溝に転動体を介して螺合するボールナットと、このボールナットの外周面に圧入嵌合された支持軸受とを備えたボールねじ装置に関する。   The present invention includes a ball screw shaft in which a male screw groove is formed, a ball nut screwed into the male screw groove of the ball screw shaft via a rolling element, and a support bearing press-fitted to the outer peripheral surface of the ball nut. The present invention relates to a provided ball screw device.

この種のボールねじ装置としては、例えばボールねじ軸にボールナットが螺合され、このボールナットの両端を転がり軸受を介してケーシングに回転自在に支持し、ボールナットの外周面にウォームに螺合するウォームホイールを外嵌するとともに、ボールナットとウォームホイールとの一方に切欠きを設け、他方に突起を設けて切欠き及び突起を係合させ、さらにウォームホイールとケーシングとの間に支持軸受を配設した構成を有するものが知られている（例えば、特許文献１参照）。   In this type of ball screw device, for example, a ball nut is screwed onto a ball screw shaft, both ends of the ball nut are rotatably supported by a casing via rolling bearings, and screwed into a worm on the outer peripheral surface of the ball nut. The worm wheel is externally fitted, a notch is provided on one of the ball nut and the worm wheel, a protrusion is provided on the other to engage the notch and the protrusion, and a support bearing is provided between the worm wheel and the casing. What has the arrangement | positioning arrange | positioned is known (for example, refer patent document 1).

特開平１０−１１０８００号公報JP-A-10-110800

しかしながら、上記特許文献１に記載の従来例にあっては、外部から回転力が伝達される回転駆動部材としてのウォームホイールの体格が大きくなるために、このウォームホイールのボールナットとの外嵌部で高い寸法精度が要求されるという未解決の課題がある。
また、ウォームホイールとケーシングとの間にも支持軸受を配設しているので、この支持軸受は適度な内部すきまを確保するため嵌め合いに制限を設ける必要があり、過酷な使用条件によってはボールねじの位置ずれが生じるという未解決の課題がある。 However, in the conventional example described in Patent Document 1, since the size of the worm wheel as a rotational drive member to which the rotational force is transmitted from the outside increases, the outer fitting portion of the worm wheel with the ball nut However, there is an unsolved problem that high dimensional accuracy is required.
In addition, since a support bearing is also arranged between the worm wheel and the casing, it is necessary to limit the fit of the support bearing to ensure an appropriate internal clearance. There is an unsolved problem that the displacement of the screw occurs.

そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、外嵌部での高い寸法精度を確保することなく、ボールねじの位置ずれを確実に防止することができるボールねじ装置を提供することを目的としている。   Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and can reliably prevent the positional deviation of the ball screw without securing high dimensional accuracy at the outer fitting portion. An object of the present invention is to provide a ball screw device that can be used.

上記目的を達成するために、請求項１に係るボールねじ装置は、雄ねじ溝を形成したボールねじ軸と、該ボールねじ軸の雄ねじ溝に転動体を介して螺合するボールナットと、前記ボールナットの外周面に圧入嵌合された支持軸受とを備えたボールねじ装置であって、前記ボールナットの一端側に当該ボールナットに対する外部からの回転力が伝達される回転駆動部材を、前記支持軸受の軸方向の移動を規制する強い圧接力で外嵌したことを特徴としている。   In order to achieve the above object, a ball screw device according to claim 1 includes a ball screw shaft formed with a male screw groove, a ball nut screwed into the male screw groove of the ball screw shaft via a rolling element, and the ball A ball screw device including a support bearing press-fitted to an outer peripheral surface of a nut, wherein a rotation driving member that transmits a rotational force from the outside to the ball nut is transmitted to one end side of the ball nut. It is characterized by external fitting with a strong pressure contact force that restricts the axial movement of the bearing.

この構成によると、ボールナットの端部に回転駆動部材を支持軸受の軸方向の移動を規制する強い圧接力で回転駆動部材を外嵌したので、外嵌部で高い寸法精度を必要とすることなくボールねじの軸方向の位置ずれを確実に防止することができる。
また、請求項２に係るボールねじ装置は、前記ボールナットの前記回転駆動部材の外嵌位置の内周面が前記雌ねじ溝のない円筒面に形成されていることを特徴している。 According to this configuration, since the rotary drive member is externally fitted to the end of the ball nut with a strong pressure contact force that restricts the axial movement of the support bearing, high dimensional accuracy is required at the external fitting portion. Therefore, the axial displacement of the ball screw can be reliably prevented.
The ball screw device according to claim 2 is characterized in that an inner peripheral surface of the ball nut at an outer fitting position of the rotation drive member is formed on a cylindrical surface without the female screw groove.

この構成によると、回転駆動部材をボールナットに強い圧接力で外嵌することにより、この外嵌位置でボールナットの内周面に変形を生じたとしても、ボールナットの円筒面とボールねじ軸の雄ねじ溝とが干渉することを防止することができる。
また、請求項３に係るボールねじ装置は、前記支持軸受は、軸方向に間座を介して配設された一対の軸受で構成されていることを特徴としている。 According to this configuration, even if the inner peripheral surface of the ball nut is deformed by externally fitting the rotation drive member to the ball nut with a strong pressure contact force, the cylindrical surface of the ball nut and the ball screw shaft It is possible to prevent interference with the male screw groove.
The ball screw device according to a third aspect is characterized in that the support bearing is composed of a pair of bearings disposed in the axial direction via a spacer.

この構成によると、ボールナットの外周面に一対の軸受が、間座を介して外嵌されているので、これら一対の軸受でボールナットを直接回転自在に支持することができる。
また、請求項４に係るボールねじ装置は、前記ボールナットは、前記支持軸受及び前記回転駆動部材が定位置に外嵌されたときに装着可能な止め輪を有することを特徴としている。 According to this configuration, since the pair of bearings are fitted on the outer peripheral surface of the ball nut via the spacer, the ball nut can be directly rotatably supported by the pair of bearings.
The ball screw device according to a fourth aspect is characterized in that the ball nut has a retaining ring that can be mounted when the support bearing and the rotary drive member are fitted in place.

この構成によると、支持軸受及び回転駆動部材がボールナットの正規の位置に外嵌されたときに初めて止め輪が装着可能となることから、支持軸受及び回転駆動部材の装着が適正であるか否かを判定することができるとともに、支持軸受及び回転駆動部材の軸方向の移動を確実に規制することができる。   According to this configuration, since the retaining ring can be mounted only when the support bearing and the rotation drive member are fitted to the proper positions of the ball nuts, whether or not the support bearing and the rotation drive member are properly mounted is determined. It is possible to determine whether or not the axial movement of the support bearing and the rotary drive member can be reliably regulated.

本発明によれば、ボールナットの一端側に当該ボールナットに対する外部からの回転力が伝達される回転駆動部材を、前記支持軸受の軸方向の移動を規制する強い圧接力で外嵌したので、外嵌部での高い寸法精度を必要しないとともに、過酷な使用条件下であってもボールねじの軸方向の位置ずれを確実に防止することができるという効果が得られる。   According to the present invention, the rotary drive member that transmits the rotational force from the outside to the ball nut is externally fitted to one end side of the ball nut with a strong pressure contact force that restricts the axial movement of the support bearing. In addition to requiring high dimensional accuracy at the outer fitting portion, it is possible to reliably prevent the positional deviation of the ball screw in the axial direction even under severe use conditions.

本発明の第１の実施形態を示すボールねじ装置の側面図である。It is a side view of a ball screw device showing a 1st embodiment of the present invention. 図１の斜視図である。FIG. 2 is a perspective view of FIG. 1. ボールねじ装置の分解斜視図である。It is a disassembled perspective view of a ball screw device. ボールナットの一部を断面としたボールねじ装置の側面図である。It is a side view of the ball screw device which made a part of ball nut a section. ボールナットと回転駆動部材との寸法関係を示す説明図である。It is explanatory drawing which shows the dimensional relationship between a ball nut and a rotational drive member. 本発明の第２の実施形態を示すボールナットの一部を断面としたボールねじ装置の側面図である。It is a side view of the ball screw device which made a section of some ball nuts the 2nd embodiment of the present invention into a section.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は本発明の第１の実施形態を示すボールねじ装置の側面図であって、図中、１はボールねじ装置である。このボールねじ装置１は、先端に取付ねじ部２を有し、この取付ねじ部２を除く外周面に雄ねじ溝３を形成したボールねじ軸４と、このボールねじ軸４に転動体としてのボール（図示せず）を介して螺合するボールナット５とを少なくとも備えている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a ball screw device showing a first embodiment of the present invention. In FIG. 1, 1 is a ball screw device. This ball screw device 1 has a mounting screw portion 2 at the tip, a ball screw shaft 4 having a male screw groove 3 formed on the outer peripheral surface excluding the mounting screw portion 2, and a ball as a rolling element on the ball screw shaft 4. And a ball nut 5 which is screwed through (not shown).

ボールナット５は、図２〜図４に示すように、円筒状のケーシング１１を有し、このケーシング１１の外周面の右端部に外方に突出するフランジ部１２が形成されている。このケーシング１１の内周面にはフランジ部１２側の半部にねじ軸４の雄ねじ溝３と対向して転動路を形成する雌ねじ溝（図示せず）が形成されているとともに、転動路の前後端間に循環路１３が形成され、転動路及び循環路１３内に転動体としてのボールが多数配設されている。また、ケーシング１１の外周面におけるフランジ部１２とは反対側に軸方向に延長するキー１４が嵌合されている。さらにケーシング１１のフランジ部１２とは反対側の内周面が雌ねじ溝を形成せず、ボールねじ軸４の雄ねじ溝３に対して所定の隙間を有する円筒面１５が形成されている。   As shown in FIGS. 2 to 4, the ball nut 5 includes a cylindrical casing 11, and a flange portion 12 that protrudes outward is formed at the right end portion of the outer peripheral surface of the casing 11. On the inner peripheral surface of the casing 11, a female screw groove (not shown) that forms a rolling path facing the male screw groove 3 of the screw shaft 4 is formed in a half portion on the flange portion 12 side. A circulation path 13 is formed between the front and rear ends of the path, and a large number of balls as rolling elements are arranged in the rolling path and the circulation path 13. A key 14 that extends in the axial direction is fitted to the opposite side of the outer peripheral surface of the casing 11 from the flange portion 12. Further, the inner peripheral surface of the casing 11 opposite to the flange portion 12 does not form a female screw groove, and a cylindrical surface 15 having a predetermined clearance with respect to the male screw groove 3 of the ball screw shaft 4 is formed.

そして、ボールナット５のケーシング１１の外周面にフランジ部１２に当接するように第１の転がり軸受２１の内輪が圧入嵌合され、次いで間座２２を介して第２の転がり軸受２３の内輪が圧入嵌合され、これら第１の転がり軸受２１、間座２２及び第２の転がり軸受２３で支持軸受２４が構成されている。   Then, the inner ring of the first rolling bearing 21 is press-fitted into the outer peripheral surface of the casing 11 of the ball nut 5 so as to contact the flange portion 12, and then the inner ring of the second rolling bearing 23 is inserted via the spacer 22. The first rolling bearing 21, the spacer 22, and the second rolling bearing 23 are press-fitted to form a support bearing 24.

そして、ボールナット５の左端側に回転駆動部材としての平歯車３１が支持軸受２４の軸方向の移動を規制する強い圧接力で外嵌されている。この平歯車３１は、外周面に歯部３２を形成し、内周面に嵌合穴３３を形成した円板部３４と、この円板部３４の嵌合穴３３側にこの嵌合穴３３に連接する内周面を有し右方に突出して形成された比較的短尺の円筒突出部３５とを有する。ここで、図５に示すように、ボールナット５のケーシング１１の外径φＤ０と平歯車３１の嵌合穴３３の内径φｄ０と円筒突出部３５の内径φｄ１との関係がφｄ１＞φＤ０＞φｄ０に設定されている。また、平歯車３１の嵌合穴３３及び円筒突出部３５の内周面には、図３及び図５に示すように、前述したケーシング１１に嵌合されたキー１４に係合するキー溝３６が形成されている。そして、平歯車３１がその円筒突出部３５をボールナット５のケーシング１１の外周面に対向させた状態で、嵌合穴３３をボールナット５のケーシング１１の外周面に強い圧接力で、円筒突出部３５の端面が支持軸受２４の第２の転がり軸受２３の内輪に当接する位置まで嵌合されている。   A spur gear 31 as a rotational drive member is fitted on the left end side of the ball nut 5 with a strong pressure contact force that restricts the axial movement of the support bearing 24. The spur gear 31 has a disc portion 34 in which a tooth portion 32 is formed on the outer peripheral surface and a fitting hole 33 is formed on the inner peripheral surface, and the fitting hole 33 on the fitting hole 33 side of the disc portion 34. And a relatively short cylindrical protruding portion 35 that has an inner peripheral surface that is connected to each other and that protrudes to the right. Here, as shown in FIG. 5, the relationship between the outer diameter φD0 of the casing 11 of the ball nut 5 and the inner diameter φd0 of the fitting hole 33 of the spur gear 31 and the inner diameter φd1 of the cylindrical protrusion 35 is φd1> φD0> φd0. Is set. Further, as shown in FIGS. 3 and 5, a key groove 36 that engages with the key 14 fitted in the casing 11 described above is formed in the fitting hole 33 of the spur gear 31 and the inner peripheral surface of the cylindrical protruding portion 35. Is formed. Then, with the spur gear 31 having the cylindrical protrusion 35 opposed to the outer peripheral surface of the casing 11 of the ball nut 5, the fitting hole 33 is protruded into the cylindrical portion with a strong pressing force against the outer peripheral surface of the casing 11 of the ball nut 5. The end surface of the portion 35 is fitted to a position where it abuts against the inner ring of the second rolling bearing 23 of the support bearing 24.

次に、上記第１の実施形態の動作を説明する。
先ず、ボールねじ軸４にボールナット５を転動体としてのボール（図示せず）を介して螺合させる。次いで、ボールナット５のケーシング１１の外周面にフランジ部１２とは反対側から第１の転がり軸受２１の内輪を圧入嵌合させて循環路１３を塞ぐように内輪をフランジ部１２に当接させる。次いで、間座２２をケーシング１１の外周面に第１の転がり軸受２１の内輪に当接するまで嵌合させてから第２の転がり軸受２３の内輪をケーシング１１の外周面に圧入嵌合させて、内輪を間座２２に当接させる。 Next, the operation of the first embodiment will be described.
First, the ball nut 5 is screwed onto the ball screw shaft 4 via a ball (not shown) as a rolling element. Next, the inner ring is brought into contact with the flange portion 12 so that the inner ring of the first rolling bearing 21 is press-fitted into the outer peripheral surface of the casing 11 of the ball nut 5 from the opposite side to the flange portion 12 to close the circulation path 13. . Next, the spacer 22 is fitted to the outer peripheral surface of the casing 11 until it comes into contact with the inner ring of the first rolling bearing 21, and then the inner ring of the second rolling bearing 23 is press-fitted to the outer peripheral surface of the casing 11. The inner ring is brought into contact with the spacer 22.

その後、平歯車３１の円筒突出部３５の内周面内に、嵌合穴３３及び円筒突出部３５の内周面に形成されたキー溝３６をケーシング１１に嵌合されたキー１４に係合させながらケーシング１１の外周面を挿通させる。この場合の円筒突出部３５内へのケーシング１１の挿通は、円筒突出部３５の内径φｄ１がケーシング１１の外径φＤ０より大きく設定されているので、ケーシング１１を容易に挿通することができるとともに、キー溝３６とキー１４との係合を容易に行うことができる。   Thereafter, the key groove 36 formed in the inner peripheral surface of the cylindrical protrusion 35 of the spur gear 31 is engaged with the key 14 fitted in the casing 11 in the fitting hole 33 and the inner peripheral surface of the cylindrical protrusion 35. The outer peripheral surface of the casing 11 is inserted while being pushed. In this case, the casing 11 is inserted into the cylindrical protruding portion 35 because the inner diameter φd1 of the cylindrical protruding portion 35 is set larger than the outer diameter φD0 of the casing 11, so that the casing 11 can be easily inserted. The key groove 36 and the key 14 can be easily engaged.

その後、嵌合穴３３をケーシング１１の外周面に所定の圧接力をもって嵌合させて、円筒突出部３５の端面を第２の転がり軸受２３の内輪に当接させる。
このため、支持軸受２４の軸方向の移動がフランジ部１２と平歯車３１とによって規制され、ボールナット４上での位置ずれが確実に防止され、過酷な使用条件下で使用してもボールねじ装置１の位置ずれを確実に防止することができる。このとき、嵌合穴３３とボールナット５のケーシング１１との嵌合が強固に行われることにより、嵌合の影響がケーシング１１の内径側に影響して内径側に変形する場合があるが、この平歯車３１の外嵌部の内周面には円筒面１５が形成されており、ボールねじ軸４の雄ねじ部３とは所定の隙間を有するので、内径側への変形部が雄ねじ部３に干渉することはなく、ボールねじ軸４の移動に影響を与えることはない。 Thereafter, the fitting hole 33 is fitted to the outer peripheral surface of the casing 11 with a predetermined pressure contact force, and the end surface of the cylindrical protruding portion 35 is brought into contact with the inner ring of the second rolling bearing 23.
For this reason, the axial movement of the support bearing 24 is restricted by the flange portion 12 and the spur gear 31, and the positional deviation on the ball nut 4 is reliably prevented, and the ball screw can be used even under severe use conditions. The position shift of the device 1 can be surely prevented. At this time, when the fitting hole 33 and the casing 11 of the ball nut 5 are firmly fitted, the influence of the fitting may affect the inner diameter side of the casing 11 and deform to the inner diameter side. A cylindrical surface 15 is formed on the inner peripheral surface of the outer fitting portion of the spur gear 31 and has a predetermined clearance from the male screw portion 3 of the ball screw shaft 4, so that the deformed portion toward the inner diameter side is the male screw portion 3. The movement of the ball screw shaft 4 is not affected.

このようにして、ボールねじ軸４にボールナット５を螺合させることができるものであるが、この状態で、ボールナット５の支持軸受２４の第１及び第２の転がり軸受２１及び２３の外輪を図示しないケーシングの内周面に固定し、且つ平歯車３１に電動モータ等の回転駆動源に連結された平歯車を噛合させる。これにより、回転駆動源の回転駆動力が平歯車３１に伝達されることにより、ボールナット５が回転駆動される。   In this way, the ball nut 5 can be screwed onto the ball screw shaft 4, and in this state, the outer rings of the first and second rolling bearings 21 and 23 of the support bearing 24 of the ball nut 5. Is fixed to the inner peripheral surface of a casing (not shown), and the spur gear 31 is engaged with a spur gear connected to a rotational drive source such as an electric motor. As a result, the rotational driving force of the rotational driving source is transmitted to the spur gear 31 so that the ball nut 5 is rotationally driven.

このとき、ボールねじ軸４の取付ねじ部２に、例えばリニアガイドのスライダ等の回転方向が規制された直動機構や回転方向が規制されたアクチュエータを螺合させて固定することにより、ボールねじ軸４の回転が規制されるので、ボールナット５の回転駆動により、ボールねじ軸４が進退駆動され、直動機構やアクチュエータを進退駆動することができる。   At this time, the ball screw shaft 4 is fixed to the mounting screw portion 2 by screwing and fixing a linear motion mechanism, such as a linear guide slider, or the like, or an actuator, the rotational direction of which is restricted. Since the rotation of the shaft 4 is restricted, the ball screw shaft 4 is driven forward and backward by the rotational drive of the ball nut 5, and the linear motion mechanism and the actuator can be driven forward and backward.

次に、本発明の第２の実施形態を図６について説明する。
この第２の実施形態では、ボールナット５のケーシング１１の外周面に、支持軸受２４を構成する第１の転がり軸受２１、間座２２及び第２の転がり軸受２３が正規の位置に嵌合され、且つ平歯車３１がその円筒突出部３５の端面を第２の転がり軸受２３の内輪に当接させた正規の位置に嵌合されたときに露出する環状溝４１が形成され、この環状溝４１にＣリング等の止め輪４２を係合させるように構成されていることを除いては前述した第１の実施形態と同様の構成を有し、図４との対応部分には同一符号を付し、その詳細説明はこれを省略する。 Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the first rolling bearing 21, the spacer 22 and the second rolling bearing 23 constituting the support bearing 24 are fitted to the outer peripheral surface of the casing 11 of the ball nut 5 at regular positions. An annular groove 41 is formed that is exposed when the spur gear 31 is fitted at a normal position where the end surface of the cylindrical protrusion 35 is in contact with the inner ring of the second rolling bearing 23. 4 has the same configuration as that of the first embodiment described above except that it is configured to engage a retaining ring 42 such as a C ring. This is not described in detail here.

この第２の実施形態によると、支持軸受２４及び平歯車３１がボールナット５のケーシング１１の外周面に正規の位置で嵌合されているときのみ止め輪４２を環状溝４１に係合させることが可能となり、支持軸受２４及び平歯車３１のボールナット５に対する嵌合が正常であるか否かを判断することができる。このため、環状溝４１の一部又は全部が平歯車３１で覆われている場合には、支持軸受２４及び平歯車３１の少なくとも一方が規定位置まで嵌合されていないものと判断することができ、これらを規定位置まで嵌合させてから止め輪４２を環状溝４１に係合させる。また、止め輪４２によって平歯車３１の軸方向の抜け出しが確実に防止されるので、ボールねじ装置の位置ずれをより確実に防止することができる。   According to the second embodiment, the retaining ring 42 is engaged with the annular groove 41 only when the support bearing 24 and the spur gear 31 are fitted to the outer peripheral surface of the casing 11 of the ball nut 5 at a regular position. Thus, it is possible to determine whether or not the support bearing 24 and the spur gear 31 are normally fitted to the ball nut 5. For this reason, when part or all of the annular groove 41 is covered with the spur gear 31, it can be determined that at least one of the support bearing 24 and the spur gear 31 is not fitted to the specified position. The retaining ring 42 is engaged with the annular groove 41 after these are fitted to a specified position. In addition, the retaining ring 42 reliably prevents the spur gear 31 from coming off in the axial direction, so that the positional displacement of the ball screw device can be more reliably prevented.

なお、上記第１及び第２の実施形態においては、回転駆動部材として平歯車３１を適用した場合について説明したが、これに限定されるものではなく、タイミングベルトを巻装した従動プーリ、ウォームホイール、傘歯車等の他の回転駆動部材を適用することができる。   In the first and second embodiments, the case where the spur gear 31 is applied as the rotational drive member has been described. However, the present invention is not limited to this, and a driven pulley and a worm wheel around which a timing belt is wound. Other rotational drive members such as bevel gears can be applied.

１…ボールねじ装置、３…雄ねじ溝、４…ボールねじ軸、５…ボールナット、１１…ケーシング、１２…フランジ部、１４…キー、１５…円筒面、２１…第１の転がり軸受、２２…間座、２３…第２の転がり軸受、２４…支持軸受、３１…平歯車、３２…歯部、３３…嵌合穴、３４…円板部、３５…円筒突出部、３６…キー溝、４１…環状溝、４２…止め輪   DESCRIPTION OF SYMBOLS 1 ... Ball screw apparatus, 3 ... Male screw groove, 4 ... Ball screw shaft, 5 ... Ball nut, 11 ... Casing, 12 ... Flange part, 14 ... Key, 15 ... Cylindrical surface, 21 ... 1st rolling bearing, 22 ... Spacer, 23 ... second rolling bearing, 24 ... support bearing, 31 ... spur gear, 32 ... tooth portion, 33 ... fitting hole, 34 ... disc portion, 35 ... cylindrical protrusion, 36 ... keyway, 41 ... annular groove, 42 ... retaining ring

Claims (4)

雄ねじ溝を形成したボールねじ軸と、該ボールねじ軸の雄ねじ溝に転動体を介して螺合するボールナットと、前記ボールナットの外周面に装着された支持軸受とを備えたボールねじ装置であって、
前記ボールナットの一端側に当該ボールナットに対する外部からの回転力が伝達される回転駆動部材を、前記支持軸受の軸方向の移動を規制する強い圧接力で外嵌したことを特徴とするボールねじ装置。 A ball screw device comprising: a ball screw shaft having a male screw groove; a ball nut screwed into the male screw groove of the ball screw shaft through a rolling element; and a support bearing mounted on the outer peripheral surface of the ball nut. There,
A ball screw characterized in that a rotary drive member that transmits a rotational force from the outside to the ball nut is externally fitted to one end side of the ball nut with a strong pressure contact force that restricts the axial movement of the support bearing. apparatus. 前記ボールナットの前記回転駆動部材の外嵌位置の内周面が前記雌ねじ溝のない円筒面に形成されていることを特徴とする請求項１に記載のボールねじ装置。   2. The ball screw device according to claim 1, wherein an inner peripheral surface of an external fitting position of the rotation drive member of the ball nut is formed in a cylindrical surface without the female screw groove. 前記支持軸受は、軸方向に間座を介して配設された一対の軸受で構成されていることを特徴とする請求項１又は２に記載のボールねじ装置。   3. The ball screw device according to claim 1, wherein the support bearing is configured by a pair of bearings disposed in the axial direction via a spacer. 4. 前記ボールナットは、前記支持軸受及び前記回転駆動部材が定位置に外嵌されたときに装着可能な止め輪を有することを特徴とする請求項１乃至３の何れか１項に記載のボールねじ装置。   4. The ball screw according to claim 1, wherein the ball nut has a retaining ring that can be mounted when the support bearing and the rotary drive member are fitted in place. 5. apparatus.
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Publication number Priority date Publication date Assignee Title
CN105317989A (en) * 2015-11-30 2016-02-10 东北大学 Load self-adaptive type automatic gear shifting transmission mechanism
CN107091308A (en) * 2017-07-07 2017-08-25 青岛英派斯健康科技股份有限公司 Skiing simulating machine lowering or hoisting gear

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JP2007315512A (en) * 2006-05-26 2007-12-06 Ntn Corp Electric linear actuator

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JPH01129027U (en) * 1988-02-23 1989-09-04
JPH09280344A (en) * 1996-04-10 1997-10-28 Isuzu Motors Ltd Gear structure
JP2003002220A (en) * 2001-06-27 2003-01-08 Nsk Ltd Electric power steering device
JP2005337412A (en) * 2004-05-28 2005-12-08 Hitachi Ltd Screw mechanism with reduction mechanism
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105317989A (en) * 2015-11-30 2016-02-10 东北大学 Load self-adaptive type automatic gear shifting transmission mechanism
CN107091308A (en) * 2017-07-07 2017-08-25 青岛英派斯健康科技股份有限公司 Skiing simulating machine lowering or hoisting gear

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