JP5206327B2 - Bearing device - Google Patents

Bearing device Download PDF

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JP5206327B2
JP5206327B2 JP2008282302A JP2008282302A JP5206327B2 JP 5206327 B2 JP5206327 B2 JP 5206327B2 JP 2008282302 A JP2008282302 A JP 2008282302A JP 2008282302 A JP2008282302 A JP 2008282302A JP 5206327 B2 JP5206327 B2 JP 5206327B2
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fixing member
housing
screw shaft
nut
peripheral surface
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JP2010107018A (en
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大輔 黒岩
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NSK Ltd
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  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
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  • Rolling Contact Bearings (AREA)

Description

本発明は、ボールねじ等の回転軸又はナットを支持する軸受として用いられる軸受装置に関する。   The present invention relates to a bearing device used as a bearing for supporting a rotary shaft such as a ball screw or a nut.

従来より、ボールねじ等のねじ軸（回転軸）又はナットは、軸受装置によって支持されている（例えば、特許文献１参照）。図５は、ボールねじ等のねじ軸を支持する従来の軸受装置の構成を示す軸方向に沿う断面図である。図５に示すように、ボールねじ２００に設置された軸受装置１００は、ハウジング１１０、組合せ転がり軸受１２０、外輪固定部材１３０、及び内輪固定部材１４０を備えている。   Conventionally, a screw shaft (rotating shaft) such as a ball screw or a nut is supported by a bearing device (see, for example, Patent Document 1). FIG. 5 is a cross-sectional view along the axial direction showing the configuration of a conventional bearing device that supports a screw shaft such as a ball screw. As shown in FIG. 5, the bearing device 100 installed on the ball screw 200 includes a housing 110, a combination rolling bearing 120, an outer ring fixing member 130, and an inner ring fixing member 140.

ボールねじ２００は、ねじ軸２１０と、転動体２２０を介してねじ軸２１０に螺合するナット２３０とを有する。ナット２３０は、ねじ軸２１０の外径より大きい内径で筒状に形成されている。ナット２３０の内面には、ねじ軸２１０の外周面に螺旋状に形成されたねじ溝２１１に対向するようにねじ溝２３１が形成されている。ねじ溝２１１とねじ溝２３１とによって形成された転動路において転動体２２０は転動可能とされている。   The ball screw 200 includes a screw shaft 210 and a nut 230 that is screwed onto the screw shaft 210 via the rolling element 220. The nut 230 is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft 210. A screw groove 231 is formed on the inner surface of the nut 230 so as to face the screw groove 211 formed in a spiral shape on the outer peripheral surface of the screw shaft 210. In the rolling path formed by the thread groove 211 and the thread groove 231, the rolling element 220 can roll.

ハウジング１１０は、ナット２３０の外径より大きい内径で筒状に形成されている。このハウジング１１０内に収容された組合せ転がり軸受１２０は、二つの転がり軸受１２１，１２２を軸方向に並べて備える。これらの転がり軸受１２１，１２２は、それぞれ外輪１２１ａ，１２２ａと、内輪１２１ｂ，１２２ｂと、外輪１２１ａ，１２２ａ及び内輪１２１ｂ，１２２ｂ間で転動可能とされた転動体１２１ｃ，１２２ｃとをそれぞれ有している。   The housing 110 is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the nut 230. The combined rolling bearing 120 accommodated in the housing 110 includes two rolling bearings 121 and 122 arranged in the axial direction. These rolling bearings 121 and 122 respectively have outer rings 121a and 122a, inner rings 121b and 122b, and rolling elements 121c and 122c that can roll between the outer rings 121a and 122a and the inner rings 121b and 122b, respectively. Yes.

軸方向に当接する外輪１２１ａ，１２２ａは、ハウジング１１０の内周面に形成された環状段部１１１の端面１１１ａと、ハウジング１１０の内周面に固定された外輪固定部材１３０とによって挟まれるように固定されている。この外輪固定部材１３０は、例えば、ロックナットである。
一方、内輪１２１ｂ，１２２ｂは、ナット２３０の外周面に形成された環状段部２３２の端面２３２ａと、ナット２３０の外周面に固定された内輪固定部材１４０とによって挟まれるように固定されている。この内輪固定部材１４０は、例えば、ロックナットである。ここで、内輪１２１ａ，１２２ａ間には予圧用差幅すきまｓが設けられている。この予圧用差幅すきまｓを用いて内輪１２１ａ，１２２ａを軸方向に互いに押しつけることにより、転がり軸受１２１，１２２に予圧がかけられる。 The outer rings 121 a and 122 a that contact in the axial direction are sandwiched between the end surface 111 a of the annular step portion 111 formed on the inner peripheral surface of the housing 110 and the outer ring fixing member 130 fixed to the inner peripheral surface of the housing 110. It is fixed. The outer ring fixing member 130 is, for example, a lock nut.
On the other hand, the inner rings 121 b and 122 b are fixed so as to be sandwiched between an end surface 232 a of an annular step 232 formed on the outer peripheral surface of the nut 230 and an inner ring fixing member 140 fixed to the outer peripheral surface of the nut 230. The inner ring fixing member 140 is, for example, a lock nut. Here, a preload differential width gap s is provided between the inner rings 121a and 122a. Preload is applied to the rolling bearings 121 and 122 by pressing the inner rings 121a and 122a with each other in the axial direction using the preload differential width gap s.

ナット２３０の軸方向の端面には、ねじ軸２１０を囲む円環状のプーリー２４０が複数本のボルトにより固定されている。このプーリー２４０と、図示しない駆動モーターとを駆動ベルト等で懸架することにより、駆動モーターを駆動させたときに、ナット２３０を回転させることができる。
また、図示はしないが、従来のボールねじにおいては、ナット２３０の代わりに、ねじ軸２１０を軸受装置１００が支持する構成も採用されている。
特開２００７−３２１７７４号公報 An annular pulley 240 surrounding the screw shaft 210 is fixed to an end surface in the axial direction of the nut 230 with a plurality of bolts. By suspending the pulley 240 and a drive motor (not shown) with a drive belt or the like, the nut 230 can be rotated when the drive motor is driven.
Although not shown, the conventional ball screw employs a configuration in which the bearing device 100 supports the screw shaft 210 instead of the nut 230.
JP 2007-321774 A

しかしながら、軸受装置１００の内輪固定部材１４０としてロックナットを用いると、ナット２３０やねじ軸２１０の回転時にイナーシャが増大し、振れが大きくなるため、ナット２３０の耐久性が低下する問題が生じる。
そこで、本発明は上記の問題点に着目してなされたものであり、その目的は、イナーシャを低減させ、内輪が設置されるナットやねじ軸の耐久性を向上させることができる軸受装置を提供することにある。 However, when a lock nut is used as the inner ring fixing member 140 of the bearing device 100, the inertia increases when the nut 230 or the screw shaft 210 rotates, and the vibration increases, resulting in a problem that the durability of the nut 230 decreases.
Therefore, the present invention has been made paying attention to the above-mentioned problems, and its purpose is to provide a bearing device that can reduce inertia and improve durability of a nut and a screw shaft on which an inner ring is installed. There is to do.

前記課題を解決するため、本発明者が鋭意検討を重ねた結果、回転するナット又はねじ軸に内輪を固定する固定部材として、ロックナットの代わりにベベル形止め輪を用いることでイナーシャを低減させ、耐久性を向上させることができることを知見した。
本発明は、本発明者による前記知見に基づくものであり、上記課題を解決するための本発明の請求項１に係る軸受装置は、ねじ軸と、転動体を介して前記ねじ軸に螺合するナットとを有するボールねじに設置され、
前記ねじ軸の外径より大きい内径で筒状に形成されたハウジングと、
該ハウジング内に収容された複数の転がり軸受と、
予圧用差幅すきまを有して配設された前記複数の転がり軸受の内輪を、前記ねじ軸に予圧をかけて固定する内輪固定部材と、
前記複数の転がり軸受の外輪を、前記ハウジングに固定する外輪固定部材と、を備えた軸受装置において、
前記内輪固定部材は、前記ねじ軸の外周面に形成された環状溝部に係合され、前記ねじ軸の外周面に形成された環状段部の端面にシムを介して一方の端部が係止された前記内輪の他方の端部を係止するベベル形止め輪であり、
前記外輪固定部材は、前記ハウジングの内周面に形成された環状溝部に係合され、前記ハウジングの内周面に形成された環状段部の端面に一方の端部が係止された前記外輪の他方の端部を係止するベベル形止め輪であることを特徴としている。 In order to solve the above-mentioned problems, the present inventor has made extensive studies and as a result, inertia is reduced by using a bevel-type retaining ring instead of a lock nut as a fixing member for fixing an inner ring to a rotating nut or screw shaft. It has been found that durability can be improved.
The present invention is based on the above knowledge obtained by the present inventor, and a bearing device according to claim 1 of the present invention for solving the above-mentioned problems is screwed to the screw shaft via a screw shaft and a rolling element. Installed on a ball screw having a nut to be
A housing formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft;
A plurality of rolling bearings housed in the housing;
An inner ring fixing member for fixing an inner ring of the plurality of rolling bearings disposed with a preload differential width gap by applying a preload to the screw shaft;
An outer ring fixing member that fixes an outer ring of the plurality of rolling bearings to the housing;
The inner ring fixing member is engaged with an annular groove formed on the outer peripheral surface of the screw shaft, and one end of the inner ring fixing member is locked to the end surface of the annular step formed on the outer peripheral surface of the screw shaft via a shim. A bevel-type retaining ring for locking the other end of the inner ring,
The outer ring fixing member is engaged with an annular groove formed on the inner peripheral surface of the housing, and one end is locked to an end surface of an annular step formed on the inner peripheral surface of the housing. It is characterized by being a bevel-type retaining ring that locks the other end portion.

また、上記課題を解決するための本発明の請求項２に係る軸受装置は、ねじ軸と、転動体を介して前記ねじ軸に螺合するナットとを有するボールねじに設置され、
前記ナットの外径より大きい内径で筒状に形成されたハウジングと、
該ハウジング内に収容された複数の転がり軸受と、
予圧用差幅すきまを有して配設された前記複数の転がり軸受の内輪を、前記ナットに予圧をかけて固定する内輪固定部材と、
前記複数の転がり軸受の外輪を、前記ハウジングに固定する外輪固定部材と、を備えた軸受装置において、
前記内輪固定部材は、前記ナットの外周面に形成された環状溝部に係合され、前記ナットの外周面に形成された環状段部の端面にシムを介して一方の端部が係止された前記内輪の他方の端部を係止するベベル形止め輪であり、
前記外輪固定部材は、前記ハウジングの内周面に形成された環状溝部に係合され、前記ハウジングの内周面に形成された環状段部の端面に一方の端部が係止された前記外輪の他方の端部を係止するベベル形止め輪であることを特徴としている。 Further, a bearing device according to claim 2 of the present invention for solving the above-mentioned problem is installed in a ball screw having a screw shaft and a nut screwed to the screw shaft via a rolling element,
A housing formed in a cylindrical shape with an inner diameter larger than the outer diameter of the nut;
A plurality of rolling bearings housed in the housing;
An inner ring fixing member for fixing the inner ring of the plurality of rolling bearings disposed with a preload differential width gap by applying a preload to the nut;
An outer ring fixing member that fixes an outer ring of the plurality of rolling bearings to the housing;
The inner ring fixing member is engaged with an annular groove formed on the outer peripheral surface of the nut, and one end is locked to the end surface of the annular step formed on the outer peripheral surface of the nut via a shim. A bevel retaining ring for locking the other end of the inner ring,
The outer ring fixing member is engaged with an annular groove formed on the inner peripheral surface of the housing, and one end is locked to an end surface of an annular step formed on the inner peripheral surface of the housing. It is characterized by being a bevel-type retaining ring that locks the other end portion.

本発明に係る軸受装置では、回転するナット又はねじ軸に内輪を固定する固定部材として、ベベル形止め輪を用いたので、軸方向及び外径方向の寸法が縮小され、イナーシャを低減させ、耐久性を向上させることができる。   In the bearing device according to the present invention, since the bevel type retaining ring is used as a fixing member for fixing the inner ring to the rotating nut or the screw shaft, the dimensions in the axial direction and the outer diameter direction are reduced, the inertia is reduced, and the durability is increased. Can be improved.

（第１の実施形態）
以下、本発明の第１の実施形態について図面を参照して説明する。図１は、本発明に係る軸受装置の第１の実施形態における構成を示す軸方向に沿う断面図である。図２は、本発明に係る軸受装置の第１の実施形態において内輪に設置されるベベル形止め輪の構成を示す図であり、（ａ）は平面図、（ｂ）は（ａ）のIIｂ−IIｂ線に沿う断面図、（ｃ）は（ｂ）のIIｃ部拡大図である。図３は、本発明に係る軸受装置の第１の実施形態において用いられるベベル形止め輪の作用を示す図である。 (First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view along the axial direction showing the configuration of the bearing device according to the first embodiment of the present invention. FIGS. 2A and 2B are diagrams showing a configuration of a bevel retaining ring installed on an inner ring in the first embodiment of the bearing device according to the present invention, wherein FIG. 2A is a plan view and FIG. 2B is IIb of FIG. Sectional drawing along line -IIb, (c) is an IIc part enlarged view of (b). FIG. 3 is a view showing the operation of the bevel retaining ring used in the first embodiment of the bearing device according to the present invention.

図１〜図３に示すように、ボールねじ５０に設置された軸受装置１は、ハウジング１０、組合せ転がり軸受２０、外輪固定部材３０、及び内輪固定部材４０を備えている。
ボールねじ５０は、ねじ軸５１と、転動体５２を介してねじ軸５１に螺合するナット５３とを有する。ナット５３は、ねじ軸５１の外径より大きい内径で筒状に形成されている。ナット５３の内面には、ねじ軸５１の外周面に螺旋状に形成されたねじ溝５１ａに対向するようにねじ溝５３ａが形成されている。ねじ溝５１ａとねじ溝５３ａとによって形成された転動路において転動体５２は転動可能とされている。 As shown in FIGS. 1 to 3, the bearing device 1 installed on the ball screw 50 includes a housing 10, a combined rolling bearing 20, an outer ring fixing member 30, and an inner ring fixing member 40.
The ball screw 50 includes a screw shaft 51 and a nut 53 that is screwed onto the screw shaft 51 via a rolling element 52. The nut 53 is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft 51. A screw groove 53 a is formed on the inner surface of the nut 53 so as to face the screw groove 51 a formed in a spiral shape on the outer peripheral surface of the screw shaft 51. The rolling element 52 can roll on a rolling path formed by the thread groove 51a and the thread groove 53a.

ハウジング１０は、ナット５３の外径より大きい内径で筒状に形成されている。このハウジング１０内に収容された組合せ転がり軸受２０は、二つの転がり軸受２１，２２を軸方向に並べて備える。これらの転がり軸受２１，２２は、それぞれ外輪２１ａ，２２ａと、内輪２１ｂ，２２ｂと、外輪２１ａ，２２ａ及び内輪２１ｂ，２２ｂ間で転動可能とされた転動体２１ｃ，２２ｃとをそれぞれ有している。   The housing 10 is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the nut 53. The combined rolling bearing 20 accommodated in the housing 10 includes two rolling bearings 21 and 22 arranged in the axial direction. These rolling bearings 21 and 22 respectively have outer rings 21a and 22a, inner rings 21b and 22b, and rolling elements 21c and 22c that can roll between the outer rings 21a and 22a and the inner rings 21b and 22b, respectively. Yes.

軸方向に当接する外輪２１ａ，２２ａは、ハウジング１０の内周面に形成された環状段部１１の端面１１ａと、ハウジング１０の内周面に固定された外輪固定部材３０とによって挟まれるように固定されている。この外輪固定部材３０は、ベベル形止め輪であり、ハウジング１０の内周面に形成された環状溝部１２に係合して固定されるいわゆる穴用ベベル形止め輪である。   The outer rings 21 a and 22 a that abut in the axial direction are sandwiched between an end surface 11 a of the annular step portion 11 formed on the inner peripheral surface of the housing 10 and an outer ring fixing member 30 fixed to the inner peripheral surface of the housing 10. It is fixed. The outer ring fixing member 30 is a bevel-type retaining ring, and is a so-called bevel-type retaining ring for a hole that is engaged and fixed to an annular groove portion 12 formed on the inner peripheral surface of the housing 10.

一方、内輪２１ｂ，２２ｂは、ナット５３の外周面に形成された環状段部５４の端面５４ａと、ナット５３の外周面に固定された内輪固定部材４０とによって挟まれるように固定されている。なお、内輪２２ｂと、環状段部５４の端面５４ａとの間には、円環状の薄板よりなるシム６０が嵌合されている。この内輪固定部材４０も、ベベル形止め輪であり、ナット５３の外周面に形成された環状溝部５５に係合して固定されるいわゆる軸用ベベル形止め輪である。ここで、内輪２１ｂ，２２ｂ間には予圧用差幅すきまｓが設けられている。この予圧用差幅すきまｓを用いて内輪２１ｂ，２２ｂを軸方向に互いに押しつけることにより、転がり軸受２１，２２に予圧がかけられる。   On the other hand, the inner rings 21 b and 22 b are fixed so as to be sandwiched between an end surface 54 a of an annular step 54 formed on the outer peripheral surface of the nut 53 and an inner ring fixing member 40 fixed to the outer peripheral surface of the nut 53. A shim 60 made of an annular thin plate is fitted between the inner ring 22b and the end face 54a of the annular step portion 54. The inner ring fixing member 40 is also a bevel-type retaining ring, and is a so-called bevel-type retaining ring for a shaft that is fixed by being engaged with an annular groove 55 formed on the outer peripheral surface of the nut 53. Here, a preload differential width gap s is provided between the inner rings 21b and 22b. Preload is applied to the rolling bearings 21 and 22 by pressing the inner rings 21b and 22b with each other in the axial direction using the preload differential width gap s.

ナット５３の軸方向の端面には、ねじ軸５１を囲む円環状のプーリー７０が複数本のボルトにより固定されている。このプーリー７０と、図示しない駆動モーターとを駆動ベルト等で懸架することにより、駆動モーターを駆動させたときに、ナット５３を回転させることができる。
内輪固定部材４０としてのベベル形止め輪は、図２（ａ）に示すように、切り欠きが形成されたＣ字形状をなす薄板である。ここで、外輪２１ａ，２２ａに設置されるベベル形止め輪（外輪固定部材３０）も内輪固定部材４０と同様の構成であるため、説明を省略する。また、図２（ｂ）に示すように、内輪固定部材４０としてのベベル形止め輪の内縁部４１には、内方に傾斜した断面形状の傾斜部４２が形成される。傾斜部４２の傾斜角度としては、図２（ｃ）に示すように、内輪固定部材４０の表面４０ａから裏面４０ｂへの俯角が軸中心方向へ１５°程度をなすことが好ましい。 An annular pulley 70 surrounding the screw shaft 51 is fixed to the end face of the nut 53 in the axial direction by a plurality of bolts. By suspending the pulley 70 and a drive motor (not shown) with a drive belt or the like, the nut 53 can be rotated when the drive motor is driven.
The bevel retaining ring as the inner ring fixing member 40 is a thin plate having a C-shape with a notch, as shown in FIG. Here, since the bevel retaining ring (outer ring fixing member 30) installed in the outer rings 21a and 22a has the same configuration as the inner ring fixing member 40, description thereof is omitted. Further, as shown in FIG. 2 (b), the inner edge portion 41 of the bevel-type retaining ring as the inner ring fixing member 40 is formed with an inclined portion 42 having an inwardly inclined sectional shape. As shown in FIG. 2C, the inclination angle of the inclined portion 42 is preferably such that the depression angle from the front surface 40a to the rear surface 40b of the inner ring fixing member 40 is about 15 ° in the axial center direction.

また、図３に示すように、内輪固定部材４０としてのベベル形止め輪を環状溝部５５に係合させる際に、内輪固定部材４０に作用する力ｆは、傾斜部４２が環状溝部５５に当接し、内輪固定部材４０に加えられる力ｆ１と、内径側（ラジアル方向）に戻ろうとする復元力ｆ２とに分散される。そして、その復元力ｆ２は、内輪２１ｂにおいて、内輪２２ｂ側に作用し、組合せ転がり軸受２０の予圧発生に寄与することとなる。   Further, as shown in FIG. 3, when the bevel retaining ring as the inner ring fixing member 40 is engaged with the annular groove portion 55, the force f acting on the inner ring fixing member 40 is applied to the inclined portion 42 against the annular groove portion 55. The force f1 applied to the inner ring fixing member 40 and the restoring force f2 trying to return to the inner diameter side (radial direction) are dispersed. The restoring force f2 acts on the inner ring 22b side in the inner ring 21b, and contributes to the generation of preload of the combined rolling bearing 20.

すなわち、内輪固定部材４０としてのベベル形止め輪を環状溝部５５に係合させた後に、複数種類の厚さから選択されるシム６０を内輪２２ｂと、環状段部５４の端面５４ａとの間に嵌めることによって、転がり軸受２１，２２にかけられる予圧量（荷重）を調整することができる。
このように、回転するナット５３に内輪２１ｂ，２２ｂを固定する内輪固定部材４０としてベベル形止め輪を用いることによって、回転対象の軸方向における寸法がＣからＡに縮小される（図１及び図５参照）。したがって、内輪２１ｂ，２２ｂが固定されるナット５３のイナーシャを低減させ、ナット５３の耐久性を向上させた軸受装置１を提供することができる。 That is, after engaging the bevel retaining ring as the inner ring fixing member 40 with the annular groove portion 55, the shim 60 selected from a plurality of thicknesses is placed between the inner ring 22 b and the end surface 54 a of the annular step portion 54. By fitting, the amount of preload (load) applied to the rolling bearings 21 and 22 can be adjusted.
Thus, by using a bevel retaining ring as the inner ring fixing member 40 that fixes the inner rings 21b and 22b to the rotating nut 53, the axial dimension of the object to be rotated is reduced from C to A (FIGS. 1 and 5). Accordingly, it is possible to provide the bearing device 1 in which the inertia of the nut 53 to which the inner rings 21b and 22b are fixed is reduced and the durability of the nut 53 is improved.

（第２の実施形態）
以下、本発明の第２の実施形態について、図面を参照して説明する。本実施形態に係る軸受装置は、内輪が固定される対象が前述の第１の実施形態と異なるだけであるので、第１の実施形態と同じ符号を付した同様の構成については説明を省略する。図４は、本発明に係る軸受装置の第２の実施形態における構成を示す軸方向に沿う断面図である。 (Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the bearing device according to the present embodiment, the object to which the inner ring is fixed is different from that of the first embodiment described above, and therefore, the description of the same configuration with the same reference numeral as that of the first embodiment is omitted. . FIG. 4 is a cross-sectional view along the axial direction showing the configuration of the bearing device according to the second embodiment of the present invention.

図４に示すように、本実施形態に係る軸受装置１は、第１の実施形態において内輪２１ｂ，２２ｂがナット５３に設置される代わりに、内輪２１ｂ，２２ｂがねじ軸５１を支持するように設置されている。具体的に、内輪２１ｂ，２２ｂは、ねじ軸５１に形成された環状溝部５１ｂに係合する内輪固定部材４０としてのベベル形止め輪と、ねじ軸５１の外周面に形成された環状段部５１ｃの端面５１ｄとの間で固定されている。なお、内輪２１ｂと、環状段部５１ｃの端面５１ｄとの間には、円環状の薄板よりなるシム６０が嵌合されている。ここで、内輪２１ｂ，２２ｂ間には予圧用差幅すきまｓが設けられている。この予圧用差幅すきまｓを用いて内輪２１ｂ，２２ｂを軸方向に互いに押しつけることにより、転がり軸受２１，２２に予圧がかけられる。   As shown in FIG. 4, the bearing device 1 according to this embodiment is configured so that the inner rings 21 b and 22 b support the screw shaft 51 instead of the inner rings 21 b and 22 b being installed on the nut 53 in the first embodiment. is set up. Specifically, the inner rings 21 b and 22 b include a bevel-type retaining ring as an inner ring fixing member 40 that engages with an annular groove 51 b formed on the screw shaft 51, and an annular step 51 c formed on the outer peripheral surface of the screw shaft 51. It is being fixed between the end surfaces 51d. A shim 60 made of an annular thin plate is fitted between the inner ring 21b and the end surface 51d of the annular step portion 51c. Here, a preload differential width gap s is provided between the inner rings 21b and 22b. Preload is applied to the rolling bearings 21 and 22 by pressing the inner rings 21b and 22b with each other in the axial direction using the preload differential width gap s.

一方、外輪２１ａ，２２ａは、ハウジング１０の内周面に形成された環状段部１１の端面１１ａと、ハウジング１０の内周面に固定された外輪固定部材３０とによって挟まれるように固定されている。この外輪固定部材３０も、ベベル形止め輪であり、ハウジング１０の内周面に形成された環状溝部１２に係合して固定されるいわゆる穴用ベベル形止め輪である。   On the other hand, the outer rings 21 a and 22 a are fixed so as to be sandwiched between an end surface 11 a of the annular step portion 11 formed on the inner peripheral surface of the housing 10 and an outer ring fixing member 30 fixed to the inner peripheral surface of the housing 10. Yes. This outer ring fixing member 30 is also a bevel-type retaining ring, and is a so-called bevel-type retaining ring for a hole that is fixed by being engaged with an annular groove portion 12 formed on the inner peripheral surface of the housing 10.

このように、本発明に係る軸受装置１がボールねじ５０の端部においてねじ軸５１を支持するために適用された場合に、内輪２１ｂ，２２ｂが設置されたねじ軸５１の軸方向に対する寸法がＣからＡに縮小される（図１及び図５参照）。したがって、ねじ軸５１のイナーシャを低減させ、ねじ軸５１の耐久性を向上させた軸受装置１を提供することができる。   As described above, when the bearing device 1 according to the present invention is applied to support the screw shaft 51 at the end of the ball screw 50, the dimension of the screw shaft 51 in which the inner rings 21b and 22b are installed is in the axial direction. It is reduced from C to A (see FIGS. 1 and 5). Therefore, the bearing device 1 in which the inertia of the screw shaft 51 is reduced and the durability of the screw shaft 51 is improved can be provided.

以上、本発明の実施の形態について説明してきたが、本発明はこれに限定されずに、種々の変更、改良を行うことができる。例えば、上記実施形態では転がり軸受２１，２２の向きを背面（ＤＢ）組合せとしたが、正面（ＤＦ）組合せでもよい。このとき、外輪固定部材３０としては、軸用ベベル形止め輪の代わりに穴用ベベル形止め輪が用いられる。   As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed. For example, in the above embodiment, the orientation of the rolling bearings 21 and 22 is the rear (DB) combination, but a front (DF) combination may be used. At this time, as the outer ring fixing member 30, a bevel-type retaining ring for a hole is used instead of the bevel-shaped retaining ring for a shaft.

本発明に係る軸受装置の第１の実施形態における構成を示す軸方向に沿う断面図である。It is sectional drawing which follows the axial direction which shows the structure in 1st Embodiment of the bearing apparatus which concerns on this invention. 本発明に係る軸受装置の第１の実施形態において内輪に設置されるベベル形止め輪の構成を示す図であり、（ａ）は平面図、（ｂ）は（ａ）のIIｂ−IIｂ線に沿う断面図、（ｃ）は（ｂ）のIIｃ部拡大図である。It is a figure which shows the structure of the bevel type retaining ring installed in an inner ring in 1st Embodiment of the bearing apparatus which concerns on this invention, (a) is a top view, (b) is the IIb-IIb line | wire of (a). Sectional drawing which follows, (c) is the IIc part enlarged view of (b). 本発明に係る軸受装置の第１の実施形態において内輪に設置されるベベル形止め輪の作用を示す図である。It is a figure which shows the effect | action of the bevel type retaining ring installed in an inner ring | wheel in 1st Embodiment of the bearing apparatus which concerns on this invention. 本発明に係る軸受装置の第２の実施形態における構成を示す軸方向に沿う断面図である。It is sectional drawing which follows the axial direction which shows the structure in 2nd Embodiment of the bearing apparatus which concerns on this invention. 従来の軸受装置の構成を示す軸方向に沿う断面図である。It is sectional drawing which follows the axial direction which shows the structure of the conventional bearing apparatus.

符号の説明Explanation of symbols

１ 軸受装置
１０ ハウジング
２０ 組合せ転がり軸受
２１，２２ 転がり軸受
２１ａ，２２ａ 外輪
２１ｂ，２２ｂ 内輪
３０ 外輪固定部材
４０ 内輪固定部材
５０ ボールねじ
５１ ねじ軸
５３ ナット
６０ シム DESCRIPTION OF SYMBOLS 1 Bearing apparatus 10 Housing 20 Combination rolling bearing 21, 22 Rolling bearing 21a, 22a Outer ring 21b, 22b Inner ring 30 Outer ring fixing member 40 Inner ring fixing member 50 Ball screw 51 Screw shaft 53 Nut 60 Shim

Claims (2)

ねじ軸と、転動体を介して前記ねじ軸に螺合するナットとを有するボールねじに設置され、
前記ねじ軸の外径より大きい内径で筒状に形成されたハウジングと、
該ハウジング内に収容された複数の転がり軸受と、
予圧用差幅すきまを有して配設された前記複数の転がり軸受の内輪を、前記ねじ軸に予圧をかけて固定する内輪固定部材と、
前記複数の転がり軸受の外輪を、前記ハウジングに固定する外輪固定部材と、を備えた軸受装置において、
前記内輪固定部材は、前記ねじ軸の外周面に形成された環状溝部に係合され、前記ねじ軸の外周面に形成された環状段部の端面にシムを介して一方の端部が係止された前記内輪の他方の端部を係止するベベル形止め輪であり、
前記外輪固定部材は、前記ハウジングの内周面に形成された環状溝部に係合され、前記ハウジングの内周面に形成された環状段部の端面に一方の端部が係止された前記外輪の他方の端部を係止するベベル形止め輪であることを特徴とする軸受装置。 Installed in a ball screw having a screw shaft and a nut screwed to the screw shaft via a rolling element;
A housing formed in a cylindrical shape with an inner diameter larger than the outer diameter of the screw shaft;
A plurality of rolling bearings housed in the housing;
An inner ring fixing member for fixing an inner ring of the plurality of rolling bearings disposed with a preload differential width gap by applying a preload to the screw shaft;
An outer ring fixing member that fixes an outer ring of the plurality of rolling bearings to the housing;
The inner ring fixing member is engaged with an annular groove formed on the outer peripheral surface of the screw shaft, and one end of the inner ring fixing member is locked to the end surface of the annular step formed on the outer peripheral surface of the screw shaft via a shim. A bevel-type retaining ring for locking the other end of the inner ring,
The outer ring fixing member is engaged with an annular groove formed on the inner peripheral surface of the housing, and one end is locked to an end surface of an annular step formed on the inner peripheral surface of the housing. It is a bevel type retaining ring which latches the other edge part of this, The bearing apparatus characterized by the above-mentioned. ねじ軸と、転動体を介して前記ねじ軸に螺合するナットとを有するボールねじに設置され、
前記ナットの外径より大きい内径で筒状に形成されたハウジングと、
該ハウジング内に収容された複数の転がり軸受と、
予圧用差幅すきまを有して配設された前記複数の転がり軸受の内輪を、前記ナットに予圧をかけて固定する内輪固定部材と、
前記複数の転がり軸受の外輪を、前記ハウジングに固定する外輪固定部材と、を備えた軸受装置において、
前記内輪固定部材は、前記ナットの外周面に形成された環状溝部に係合され、前記ナットの外周面に形成された環状段部の端面にシムを介して一方の端部が係止された前記内輪の他方の端部を係止するベベル形止め輪であり、
前記外輪固定部材は、前記ハウジングの内周面に形成された環状溝部に係合され、前記ハウジングの内周面に形成された環状段部の端面に一方の端部が係止された前記外輪の他方の端部を係止するベベル形止め輪であることを特徴とする軸受装置。 Installed in a ball screw having a screw shaft and a nut screwed to the screw shaft via a rolling element;
A housing formed in a cylindrical shape with an inner diameter larger than the outer diameter of the nut;
A plurality of rolling bearings housed in the housing;
An inner ring fixing member for fixing the inner ring of the plurality of rolling bearings disposed with a preload differential width gap by applying a preload to the nut;
An outer ring fixing member that fixes an outer ring of the plurality of rolling bearings to the housing;
The inner ring fixing member is engaged with an annular groove formed on the outer peripheral surface of the nut, and one end is locked to the end surface of the annular step formed on the outer peripheral surface of the nut via a shim. A bevel retaining ring for locking the other end of the inner ring,
The outer ring fixing member is engaged with an annular groove formed on the inner peripheral surface of the housing, and one end is locked to an end surface of an annular step formed on the inner peripheral surface of the housing. It is a bevel type retaining ring which latches the other edge part of this, The bearing apparatus characterized by the above-mentioned.
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