JP2010255745A

JP2010255745A - Ball screw

Info

Publication number: JP2010255745A
Application number: JP2009106479A
Authority: JP
Inventors: Daisuke Kuroiwa; 大輔黒岩
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2009-04-24
Filing date: 2009-04-24
Publication date: 2010-11-11
Anticipated expiration: 2029-04-24
Also published as: JP5359515B2

Abstract

<P>PROBLEM TO BE SOLVED: To replace an oil retaining member attached to a nut end without removing a ball screw from a table even in a state of being installed on the table. <P>SOLUTION: The ball screw 1 has a connecting part attachable to and detachable from the axial direction of the end of a nut 3, and has a cylindrical housing 40 capable of storing the oil retaining member 50 constituted of a plurality of divided parts 51 and 52. The respective divided parts of the oil retaining member 40 have engaging grooves 51m and 52m formed in the axial direction. The housing 40 has a plurality of projection strips 48 fitted in the respective engaging grooves 51m and 52m so as to allow movement in axial directions of the respective divided parts 51 and 52 and restrict the movement in the peripheral direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ナット端部に配設される付帯装置を備えるボールねじに係り、特に、その付帯装置での含油部材の装着構造に関する。 The present invention relates to a ball screw including an accessory device disposed at an end of a nut, and more particularly, to an oil retaining member mounting structure in the accessory device.

付帯装置をナット端部に設けたボールねじとしては、例えば特許文献１に記載の技術が知られている。
特許文献１に記載のボールねじは、付帯装置として、シール装着装置がナット端部に付設される。このシール装着装置は、ナットの内周面に嵌合する外周面を有するリング状のシールハウジングと、このシールハウジングをナットに固定する固定ピンと、シールハウジング内に収容されるリング状のシール部材と、このシール部材をシールハウジングに押圧する方向に弾性付勢すると共に固定ピンをシールハウジングの外周面から突出させてナットの内周面に嵌合させる方向に弾性付勢する弾性付勢部材（例えばＣ形止め輪）とを備えている。 As a ball screw provided with an accessory device at a nut end, for example, a technique described in Patent Document 1 is known.
In the ball screw described in Patent Document 1, a seal mounting device is attached to the nut end as an accessory device. The seal mounting device includes a ring-shaped seal housing having an outer peripheral surface fitted to an inner peripheral surface of a nut, a fixing pin for fixing the seal housing to the nut, and a ring-shaped seal member accommodated in the seal housing. An elastic biasing member (for example, an elastic biasing member that elastically biases the seal member in a direction in which the seal member is pressed against the seal housing and elastically biases the fixing pin in a direction in which the fixing pin protrudes from the outer peripheral surface of the seal housing and fits into the inner peripheral surface of the nut. C-shaped retaining ring).

特開２００３−２９４１０４号公報JP 2003-294104 A

ここで、特許文献１に記載のシール装着装置では、含油部材の装着構造については言及されていないが、付帯装置をナット端部に設けたボールねじとしては、シール部材の装着に加え、含油部材も装着可能な構造とされる付帯装置もある。
例えば図１０（図１１〜図１６は構成する各部品を示す）に、シール部材の装着構造に加え、含油部材も装着可能な構造とした付帯装置（以下、「含油部材装着装置」ともいう）をナット端部に設けたボールねじの一例を示す。この例では、特許文献１に記載の技術を発展させて、含油部材を併せて装着可能になっている。 Here, in the seal mounting device described in Patent Document 1, the mounting structure of the oil-impregnated member is not mentioned, but as a ball screw provided with an auxiliary device at the nut end, in addition to the mounting of the seal member, the oil-impregnated member There is also an incidental device that can be mounted.
For example, in FIG. 10 (FIGS. 11 to 16 show constituent parts), in addition to the mounting structure of the seal member, an auxiliary device (hereinafter also referred to as “oil-containing member mounting device”) configured to be able to mount an oil-containing member as well. Shows an example of a ball screw provided at the nut end. In this example, the technique described in Patent Document 1 is developed so that the oil-containing member can be attached together.

つまり、図１０に示すように、このボールねじ１００には、ナット３の端部に含油部材装着装置１１０が付設されている。ナット３には、その端部の内径部に、係合溝３ｃが設けられている。一方、含油部材装着装置１１０は、略円筒状のハウジング１４０を有し、そのナット３側の端部の周面には、ナット３への連結用の穴１４０ａが径方向に開設されている。 That is, as shown in FIG. 10, the oil retaining member mounting device 110 is attached to the end portion of the nut 3 in the ball screw 100. The nut 3 is provided with an engagement groove 3c in the inner diameter portion at the end thereof. On the other hand, the oil impregnated member mounting device 110 has a substantially cylindrical housing 140, and a hole 140a for connection to the nut 3 is formed in the radial direction on the peripheral surface of the end portion on the nut 3 side.

そして、この例では、この穴１４０ａと係合溝３ｃとの周方向の位置を、相互が対向する位置に合わせた後に、特許文献１に記載の技術同様に、固定ピン１２０を径方向内側から穴１４０ａを通して係合溝３ｃに挿入し、さらに、固定ピン１２０の抜け防止用に、Ｃ形止め輪１３０によってハウジング１４０内径側から固定し、これにより、ハウジング１４０が、ナット３から抜けなくなる構造になっている。そして、リング状の含油部材１５０は、略円筒状のハウジング１４０の内径部に嵌め込まれ、さらに、その軸方向での外側にリング状のシール部材１６０が嵌め込まれ、ハウジング１４０の外径方向の外側から固定ねじ１４１，１４２によってそれぞれ締結固定される。 In this example, after the positions of the holes 140a and the engagement grooves 3c in the circumferential direction are matched with the positions facing each other, the fixing pin 120 is moved from the radially inner side in the same manner as the technique described in Patent Document 1. It is inserted into the engagement groove 3c through the hole 140a, and is further fixed from the inner diameter side of the housing 140 by the C-shaped retaining ring 130 to prevent the fixing pin 120 from coming off, thereby preventing the housing 140 from coming off the nut 3. It has become. The ring-shaped oil-impregnated member 150 is fitted into the inner diameter portion of the substantially cylindrical housing 140, and the ring-shaped seal member 160 is fitted on the outer side in the axial direction. To fastening screws 141 and 142, respectively.

ここで、この種の付帯装置をナット端部に設けたボールねじの使用例を図１７（（ａ）〜（ｃ））に示す。なお、同図（ａ）は、その平面図、（ｂ）は（ａ）でのＢ矢視図、（ｃ）は（ａ）でのＣ矢視図である。
同図に示す例では、ボールねじ１００は機台９上に設置され、このボールねじ１００の両側には、リニアガイド（直動案内装置）５が、その案内レール６をボールねじ１００と並列にそれぞれ設けられている。そして、各リニアガイド５のスライダ７とボールねじ１００のナット３とが、テーブル（またはブラケット）８を用いて一体に固定されている。テーブル８は、その大きさも使用用途により種々あるが、多くの製造装置においては、同図に示すように、ボールねじ１００のナット３、およびリニアガイド５のスライダ７を完全に覆った形状となっている。 Here, FIG. 17 ((a)-(c)) shows the usage example of the ball screw which provided this kind of accessory apparatus in the nut edge part. In addition, the figure (a) is the top view, (b) is the B arrow view in (a), (c) is the C arrow view in (a).
In the example shown in the figure, the ball screw 100 is installed on the machine base 9, and linear guides (linear motion guide devices) 5 are provided on both sides of the ball screw 100, and the guide rail 6 is parallel to the ball screw 100. Each is provided. The slider 7 of each linear guide 5 and the nut 3 of the ball screw 100 are integrally fixed using a table (or bracket) 8. The size of the table 8 varies depending on the application, but in many manufacturing apparatuses, as shown in the figure, the nut 8 of the ball screw 100 and the slider 7 of the linear guide 5 are completely covered. ing.

ところで、上述したような、内部に含油部材が設けられている付帯装置（含油部材装着装置）において、含油部材は、耐用年数、耐用走行距離数が限られており、その耐用年数や走行距離数が超過すると機能が低下する。そのため、耐用年数や走行距離数が超過した際には、含油部材を交換する必要がある。
しかしながら、上述のような含油部材装着装置１１０の装着構造では、ハウジング１４０、含油部材１５０を確実に固定できるものの、機台９上のテーブル８に一度組み込まれると、リング状の含油部材１５０は、略円筒状のハウジング１４０の内径部に嵌め込まれ、ハウジング１４０の外径方向の外側から固定ねじ１４１によって締結固定されるため、テーブル８からボールねじ１００を取り外さない限り、固定ねじ１４１を取り外すことができない。したがって、メンテナンスにおいて、含油部材１５０を交換する際は、テーブル８から、ボールねじ１００およびこれに係る機構部分を大きく分解する必要があった。 By the way, in the incidental device (oil-containing member mounting device) provided with an oil-impregnated member as described above, the oil-impregnated member has a limited service life and the number of serviceable travel distances. If it exceeds, the function deteriorates. Therefore, it is necessary to replace the oil-containing member when the service life or the number of travel distances has been exceeded.
However, in the mounting structure of the oil impregnated member mounting apparatus 110 as described above, the housing 140 and the oil impregnated member 150 can be securely fixed, but once incorporated into the table 8 on the machine base 9, the ring-shaped oil impregnated member 150 is Since it is fitted in the inner diameter portion of the substantially cylindrical housing 140 and is fastened and fixed by the fixing screw 141 from the outside in the outer diameter direction of the housing 140, the fixing screw 141 can be removed unless the ball screw 100 is removed from the table 8. Can not. Therefore, when replacing the oil-impregnated member 150 in maintenance, it is necessary to largely disassemble the ball screw 100 and the mechanism portion related thereto from the table 8.

そこで、本発明は、このような問題点に着目してなされたものであって、ナット端部に含油部材を付設するための付帯装置が設けられるボールねじにおいて、その含油部材のメンテナンスに際し、テーブルに装着された状態であっても、テーブルからボールねじを取り外すことなく、また、これに係る機構部分の分解を可及的に少なくし得るボールねじ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 such a problem, and in a ball screw provided with an auxiliary device for attaching an oil impregnating member to an end of a nut, a table for maintenance of the oil impregnating member is provided. It is an object of the present invention to provide a ball screw that can reduce the disassembly of the mechanism portion related to this without removing the ball screw from the table even when mounted on the table.

上記課題を解決するために、本発明は、ねじ軸と、該ねじ軸にボールを介して相対回転移動自在に外嵌されるナットと、該ナット端部に含油部材を配置する付帯装置とを備えるボールねじであって、前記付帯装置は、前記ナット端部に軸方向から着脱可能な連結部を有するとともに、自身内部に前記含油部材を収容可能な円筒状のハウジングを備え、前記含油部材は、環状体を軸方向に沿って分割した複数の分割部から構成されるとともに、各分割部が、軸方向に沿って形成された係合部をそれぞれ有し、前記ハウジングは、前記含油部材の各係合部に嵌め込まれることで各分割部の装着姿勢を保持する複数の含油部材装着姿勢保持部を有し、各含油部材装着姿勢保持部は、その保持する各分割部の軸方向への移動を許容するとともに、周方向への移動を拘束するように各係合部に嵌め込まれるようになっていることを特徴としている。 In order to solve the above-described problems, the present invention includes a screw shaft, a nut that is externally fitted to the screw shaft via a ball so as to be relatively rotatable, and an auxiliary device that disposes an oil-impregnated member at the end of the nut. The accessory device has a connecting portion that is attachable and detachable from the axial direction at the nut end portion, and includes a cylindrical housing that can accommodate the oil-containing member therein. The annular body is divided into a plurality of divided portions along the axial direction, and each divided portion has an engaging portion formed along the axial direction. Each oil retaining member mounting posture holding portion has a plurality of oil retaining member mounting posture holding portions that hold the mounting posture of each divided portion by being fitted into each engaging portion. Allow movement and move around It is characterized by being adapted to be fitted into respective engaging portions so as to restrain the movement of the.

なお、例えば、前記含油部材の係合部は、各分割部の外周面に、軸方向に沿って形成された係合溝からなり、前記含油部材装着姿勢保持部は、前記ハウジングの内周面にその径方向内側に向けて張り出すとともに軸方向に沿って形成された突条部からなる構成とすることができる。
また、例えば、前記含油部材の係合部は、各分割部の側面から軸方向に沿って穿設された係合穴からなり、前記含油部材装着姿勢保持部は、前記ハウジングの内周面に形成された円環状の鍔部の側面から軸方向に向けて立設された軸部からなる構成とすることができる。 For example, the engaging portion of the oil-impregnated member is formed of an engaging groove formed along the axial direction on the outer peripheral surface of each divided portion, and the oil-containing member mounting posture holding portion is the inner peripheral surface of the housing. And projecting toward the inside in the radial direction, and a configuration comprising a protrusion formed along the axial direction.
In addition, for example, the engaging portion of the oil-impregnated member includes an engaging hole drilled along the axial direction from the side surface of each divided portion, and the oil-containing member mounting posture holding portion is formed on the inner peripheral surface of the housing. It can be set as the structure which consists of an axial part standing toward the axial direction from the side surface of the formed annular collar part.

本発明によれば、その付帯装置は、軸方向からナット端部側の部材に相互着脱が可能な連結部を有するとともに、自身内部に含油部材を収容可能な円筒状のハウジングを備えているので、まず、この連結部の連結を軸方向から解除してナット端部からハウジングを外し、次いで、このハウジングをねじ軸の軸方向に沿ってスライド移動させれば、テーブルから離隔した位置までハウジングを移動し、その状態でハウジング内の含油部材を側面から視認可能とすることができる。 According to the present invention, the accessory device has a connecting portion that can be attached to and detached from the nut end side member from the axial direction, and includes a cylindrical housing that can accommodate the oil-containing member therein. First, release the connection of the connecting portion from the axial direction, remove the housing from the nut end, and then slide the housing along the axial direction of the screw shaft, the housing is moved to a position separated from the table. It moves, and the oil-containing member in the housing can be made visible from the side in that state.

そして、この状態において、この付帯装置は、含油部材が、環状体を軸方向に沿って分割した複数の分割部から構成されるとともに、各分割部が、軸方向に沿って形成された係合部をそれぞれ有しており、一方、ハウジングは、含油部材の各係合部に嵌め込まれることで各分割部の装着姿勢を保持する複数の含油部材装着姿勢保持部を有し、各含油部材装着姿勢保持部は、その保持する各分割部の軸方向への移動を許容するとともに、周方向への移動を拘束するように各係合部に嵌め込まれるようになっているので、各分割部を含油部材装着姿勢保持部の延設方向、つまり軸方向に沿って引き出し、ハウジング内から取り外すことができる。そして、この含油部材は、環状体を軸方向に沿って分割した複数の分割部から構成されているから、軸方向に沿ってハウジング内から引き出した後に、各分割部を径方向に取り外し可能である。 And in this state, this auxiliary | assistant apparatus is an engagement with which the oil impregnation member was comprised from the some division | segmentation part which divided | segmented the annular body along the axial direction, and each division | segmentation part was formed along the axial direction. On the other hand, the housing has a plurality of oil retaining member mounting posture holding portions that hold the mounting posture of each divided portion by being fitted into each engaging portion of the oil retaining member. The posture holding part is adapted to be fitted into each engaging part so as to allow movement in the axial direction of each divided part to be held and to restrain movement in the circumferential direction. It can be pulled out along the extending direction of the oil retaining member mounting posture holding portion, that is, the axial direction, and removed from the housing. And since this oil-impregnated member is comprised from the some division | segmentation part which divided | segmented the annular body along the axial direction, after pulling out from the housing along an axial direction, each division | segmentation part can be removed in radial direction. is there.

また、含油部材をナット端部に装着する際には、この逆の手順によって、ねじ軸の軸方向からの装着作業のみによって装着できるから、テーブルにボールねじが装着された状態であっても、テーブルからボールねじを取り外すことなくねじ軸の軸方向からの作業のみによって含油部材を交換することができる。
したがって、本発明に係るボールねじによれば、ナット端部に含油部材を付設するための付帯装置が設けられるボールねじにおいて、その含油部材のメンテナンスに際し、テーブルに装着された状態であっても、テーブルからボールねじを取り外すことなく、また、これに係る機構部分の分解を可及的に少なくすることができる。 Also, when mounting the oil-impregnated member on the nut end, it can be mounted only by mounting work from the axial direction of the screw shaft by the reverse procedure, so even if the ball screw is mounted on the table, The oil-impregnated member can be replaced only by the work from the axial direction of the screw shaft without removing the ball screw from the table.
Therefore, according to the ball screw according to the present invention, in the ball screw provided with an auxiliary device for attaching the oil-impregnated member to the nut end, in the maintenance of the oil-impregnated member, even in a state of being attached to the table, Without removing the ball screw from the table, the disassembly of the mechanism portion related to this can be minimized.

本発明に係るボールねじの一実施形態の説明図であり、同図では軸線を含む断面を図示している。It is explanatory drawing of one Embodiment of the ball screw which concerns on this invention, and the cross section containing an axis line is shown in the same figure. 本発明に係るボールねじのナットを説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the nut of the ball screw concerning the present invention, the figure (a) is a sectional view including the axis, and (b) is a front view. 本発明に係るボールねじの、含油部材装着装置の固定板を説明する図であり、同図（ａ）はその軸線を含む断面図（同図（ｂ）でのＸ−Ｘ断面）、（ｂ）は正面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the fixing plate of the oil-impregnated member mounting apparatus of the ball screw which concerns on this invention, The figure (a) is sectional drawing (XX cross section in the figure (b)) including the axis line, (b) ) Is a front view. 本発明に係るボールねじの、含油部材装着装置の連結板を説明する図であり、同図（ａ）はその軸線を含む断面図（同図（ｂ）でのＹ−Ｙ断面）、（ｂ）は正面図である。It is a figure explaining the connection board of the oil impregnated member mounting apparatus of the ball screw which concerns on this invention, The figure (a) is sectional drawing (YY cross section in the figure (b)) including the axis line, (b) ) Is a front view. 本発明に係るボールねじの、含油部材装着装置のハウジングを説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the housing of the oil impregnated member mounting apparatus of the ball screw which concerns on this invention, The figure (a) is sectional drawing containing the axis line, (b) is a front view. 本発明に係るボールねじの、含油部材装着装置の含油部材を説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the oil impregnation member of the oil impregnation member mounting apparatus of the ball screw which concerns on this invention, the same figure (a) is sectional drawing containing the axis line, (b) is a front view. 本発明に係るボールねじの、含油部材装着装置のシール部材を説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the sealing member of the oil impregnated member mounting apparatus of the ball screw which concerns on this invention, The figure (a) is sectional drawing containing the axis line, (b) is a front view. 図１に示す実施形態の変形例の説明図であり、同図では軸線を含む断面を図示している。It is explanatory drawing of the modification of embodiment shown in FIG. 1, and the cross section containing an axis line is shown in the same figure. 変形例のハウジングを説明する図であり、同図（ａ）はその軸線を含む断面図（同図（ｂ）でのＹ−Ｙ断面）、（ｂ）は正面図である。It is a figure explaining the housing of a modification, The figure (a) is sectional drawing containing the axis line (YY cross section in the figure (b)), (b) is a front view. 従来技術をベースとした、含油部材装着装置の装着構造の一例を説明する図であり、同図では軸線を含む断面を図示している。It is a figure explaining an example of the mounting structure of the oil impregnated member mounting apparatus based on a prior art, and the cross section containing an axis line is shown in the same figure. 図１０に示すボールねじのナットを説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the nut of a ball screw shown in Drawing 10, the figure (a) is a sectional view including the axis, and (b) is a front view. 図１０に示す含油部材装着装置のハウジングを説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the housing of the oil impregnation member mounting apparatus shown in FIG. 10, (a) is sectional drawing containing the axis line, (b) is a front view. 図１０に示す含油部材装着装置の固定ピンを説明する図である。It is a figure explaining the fixing pin of the oil impregnated member mounting apparatus shown in FIG. 図１０に示す含油部材装着装置のＣ形止め輪を説明する図である。It is a figure explaining the C-shaped retaining ring of the oil-containing member mounting apparatus shown in FIG. 図１０に示す含油部材装着装置の含油部材を説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the oil impregnation member of the oil impregnation member mounting apparatus shown in FIG. 10, The same figure (a) is sectional drawing containing the axis line, (b) is a front view. 図１０に示す含油部材装着装置のシール部材を説明する図であり、同図（ａ）はその軸線を含む断面図、（ｂ）は正面図である。It is a figure explaining the sealing member of the oil impregnation member mounting apparatus shown in FIG. 10, The same figure (a) is sectional drawing containing the axis line, (b) is a front view. ナット端部に含油部材装着装置等の付帯装置が設けられたボールねじの使用例を説明する図であり、同図（ａ）は、その平面図、（ｂ）は（ａ）でのＢ矢視図、（ｃ）は（ａ）でのＣ矢視図である。It is a figure explaining the usage example of a ball screw provided with incidental devices, such as an oil impregnation member mounting device, at the nut end, the figure (a) is the top view, and (b) is B arrow in (a) FIG. 4C is a view in the direction of arrow C in FIG.

以下、本発明の一実施形態について、図面を適宜参照しつつ説明する。
図１に示すように、このボールねじ１は、ねじ溝２ａを外周面に有するねじ軸２と、このねじ溝２ａに対応するねじ溝３ａを内周面に有するナット３と、これらねじ溝２ａ，３ａ間に形成されたボール転動路を転動する多数のボール４とを有し、ナット３は、ねじ軸２に多数のボール４を介して相対回転移動自在に外嵌され、このナット３の両端部（同図では一方の端部のみ図示）に、シール部材６０および含油部材５０を配置する付帯装置として付設された一対の含油部材装着装置１０とを備えている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, the ball screw 1 includes a screw shaft 2 having a screw groove 2a on the outer peripheral surface, a nut 3 having a screw groove 3a corresponding to the screw groove 2a on the inner peripheral surface, and these screw grooves 2a. , 3a, and a plurality of balls 4 that roll on a ball rolling path formed between the nuts 3a and 3a. The nut 3 is externally fitted to the screw shaft 2 via the plurality of balls 4 so as to be relatively rotatable. 3 is provided with a pair of oil-impregnated member mounting devices 10 attached as accessory devices for disposing the seal member 60 and the oil-impregnated member 50 at both end portions (only one end is shown in the figure).

なお、本実施形態は、ナット３を高速で作動させた時でも音響特性を大きく低下させることのないボールねじの例であり、ナット３の両端面にボールの戻し路（不図示）を開設するとともに、この戻し路又はボール転動路を転動したボール４を、戻し路又はボール転動路に案内するボール案内部材（不図示）をナット３の内部両端に有する例である。
以下、このボールねじ１の含油部材装着装置１０およびその着脱構造について詳しく説明する。 The present embodiment is an example of a ball screw that does not greatly deteriorate the acoustic characteristics even when the nut 3 is operated at a high speed, and a ball return path (not shown) is opened on both end faces of the nut 3. In addition, in this example, ball guide members (not shown) for guiding the balls 4 rolling on the return path or the ball rolling path to the return path or the ball rolling path are provided at both inner ends of the nut 3.
Hereinafter, the oil impregnated member mounting device 10 of the ball screw 1 and its attachment / detachment structure will be described in detail.

図１または図２に示すように、ナット３の端面の内径部３ｂには、その周方向に離間して複数の係合溝３ｃが凹の円弧状に設けられている。この例では、上下（１８０°）に対向する位置に係合溝３ｃが二箇所形成されている。一方、含油部材装着装置１０は、リング状の連結板２０および固定板３０を備え、さらに、固定板３０の外側面に、略円筒状のハウジング４０が着脱可能に設けられ、このハウジング４０内に、含油部材５０およびシール部材６０が収容されている。 As shown in FIG. 1 or FIG. 2, the inner diameter portion 3b of the end surface of the nut 3 is provided with a plurality of engagement grooves 3c spaced in the circumferential direction in a concave arc shape. In this example, two engagement grooves 3c are formed at positions facing vertically (180 °). On the other hand, the oil-impregnated member mounting device 10 includes a ring-shaped connecting plate 20 and a fixed plate 30, and a substantially cylindrical housing 40 is detachably provided on the outer surface of the fixed plate 30. The oil-containing member 50 and the seal member 60 are accommodated.

詳しくは、連結板２０および固定板３０は、図１に示すように、軸方向から相互を締結およびその解除が可能な締結部７０を有しており、本実施形態の例では、連結板２０には、周方向に１８０°離間して二箇所のタップ穴（雌ねじ）２５が形成され（図３参照）、固定板３０には、連結板２０のタップ穴２５に軸方向で対向する位置に、二箇所の座繰り穴３２が穿設されており（図４参照）、固定板３０の外側面側から二本の締結用ねじ９２によって相互の締結およびその解除が可能になっている。 Specifically, as shown in FIG. 1, the connecting plate 20 and the fixing plate 30 have a fastening portion 70 that can be fastened and released from each other in the axial direction. In the example of this embodiment, the connecting plate 20 Are formed with two tapped holes (female screws) 25 spaced apart by 180 ° in the circumferential direction (see FIG. 3), and the fixing plate 30 is located at a position facing the tapped holes 25 of the connecting plate 20 in the axial direction. Two countersink holes 32 are drilled (see FIG. 4), and the two fastening screws 92 enable mutual fastening and release from the outer surface side of the fixing plate 30.

さらに、連結板２０には、図１または図３に示すように、上記ナット３の複数の係合溝３ｃに嵌め込まれる複数の係止部２３が凸の円弧状に設けられている。
連結板２０のリング状の本体部２１は、その外径部２６の寸法が、ナット３の端部に挿入可能になっており、この外径部２６には、上下（１８０°）に対向する位置に係止部２３が二箇所形成されている。そして、この係止部２３は、上記ナット３の複数の係合溝３ｃにそれぞれ嵌め込まれるとともに自身径方向に弾性的に変位可能なように間隙部２４をもって形成されている。本実施形態の例では、この間隙部２４は、リング状の本体部２１の周方向に沿って円弧状に形成されるとともに一端側が外径部２６の外周面側に開口しており、これにより、間隙部２４の他端側が基端部となって係止部２３を片持ち腕部２２で支持している。 Furthermore, as shown in FIG. 1 or FIG. 3, the coupling plate 20 is provided with a plurality of locking portions 23 fitted in the plurality of engaging grooves 3 c of the nut 3 in a convex arc shape.
The ring-shaped main body portion 21 of the connecting plate 20 has an outer diameter portion 26 that can be inserted into the end of the nut 3. The outer diameter portion 26 faces vertically (180 °). Two locking portions 23 are formed at the positions. And this latching | locking part 23 is formed with the gap | interval part 24 so that it can each be elastically displaced in the radial direction while being each inserted in the some engaging groove 3c of the said nut 3. As shown in FIG. In the example of the present embodiment, the gap portion 24 is formed in an arc shape along the circumferential direction of the ring-shaped main body portion 21, and one end side opens to the outer peripheral surface side of the outer diameter portion 26. The other end side of the gap portion 24 is a base end portion, and the locking portion 23 is supported by the cantilever arm portion 22.

固定板３０は、リング状の本体部３１を有し、上記連結板２０側の端面には、連結板２０の内径に対して「インロー」となるように突設された環状のインロー部３４が形成されており、連結板２０に固定板３０を固定する際に、ボールねじ１の軸心ＣＬと同軸に容易に装着可能になっている。そして、本体部３１には、軸方向に貫通形成された上記座繰り穴３２に加え、さらに、タップ穴（雌ねじ）３３が複数（この例では二箇所）設けられている。このタップ穴３３は、連結板２０の各間隙部２４に対向する位置に設けられており、このタップ穴３３に軸方向から軸部用ねじ９１が挿入されて固定されることで、軸部用ねじ９１のねじ部分が連結板２０の係止部２３の戻り防止用の軸部８０となり、複数の係止部２３の径方向の弾性的変位を阻止するようになっている。 The fixing plate 30 has a ring-shaped main body portion 31, and an annular inlay portion 34 projecting so as to be “inlay” with respect to the inner diameter of the connecting plate 20 is provided on the end surface on the connecting plate 20 side. Thus, when the fixing plate 30 is fixed to the connecting plate 20, it can be easily mounted coaxially with the axial center CL of the ball screw 1. The main body 31 is provided with a plurality of tap holes (female screws) 33 (two in this example) in addition to the counterbore holes 32 penetratingly formed in the axial direction. The tap hole 33 is provided at a position facing each gap portion 24 of the connecting plate 20, and the shaft portion screw 91 is inserted into the tap hole 33 from the axial direction and fixed, thereby fixing the shaft portion. The screw portion of the screw 91 serves as a shaft portion 80 for preventing the return of the locking portion 23 of the connecting plate 20 and prevents the plurality of locking portions 23 from being elastically displaced in the radial direction.

さらに、固定板３０には、図４に示すように、本体部３１の外側面の１８０°に対向する位置に、係合案内面３５と、この係合案内面３５に隣接して形成された係合フック３６とが二箇所形成されている。この係合フック３６は、同図（ａ）に示すように、横断面が略コ字状をなして固定板３０の軸方向での外側を向く面（同図での右側の面）に、装着されるハウジング４０側に張り出して形成されている。また、係合案内面３５は、周方向に沿って形成された斜面であり、この斜面の傾斜は、略コ字状の係合フック３６の近傍側が高く（つまり、その反対側に向けて低く）なっている。 Further, as shown in FIG. 4, the fixing plate 30 is formed adjacent to the engagement guide surface 35 at a position facing the outer surface of the main body 31 at 180 °. Two engagement hooks 36 are formed. As shown in FIG. 6A, the engagement hook 36 has a substantially U-shaped cross section and faces the outside in the axial direction of the fixing plate 30 (the right side surface in the figure). An overhang is formed on the housing 40 side to be mounted. The engagement guide surface 35 is a slope formed along the circumferential direction, and the slope of this slope is high on the side near the substantially U-shaped engagement hook 36 (that is, low toward the opposite side). It has become.

これに対し、装着されるハウジング４０には、図５に示すように、その円筒状の固定板３０側の端部に、係合爪４２が二箇所に形成されている。この係合爪４２は、上記係合フック３６に係合するように、相互の周方向の位置を合わせて、相互が対向する位置で嵌め合わせられるように形成されることで連結部を構成している。また、この係合爪４２は、周方向に沿って形成された係合用斜面４２ａと、これに隣接する係合面４２ｂとを有している。係合用斜面４２ａは、その連結部としての係脱動作が円滑になるように、上記係合フック３６の側が低く、係合面４２ｂ側に高い傾斜の面になっている。 On the other hand, as shown in FIG. 5, the housing 40 to be mounted is formed with two engaging claws 42 at the end portion on the cylindrical fixing plate 30 side. The engaging claws 42 are formed so that the circumferential positions of the engaging claws 42 are engaged with each other so that the engaging claws 42 are engaged with each other so as to be engaged with each other. ing. The engaging claw 42 has an engaging slope 42a formed along the circumferential direction, and an engaging surface 42b adjacent to the engaging inclined surface 42a. The engaging slope 42a has a low slope on the side of the engaging hook 36 and a high slope on the side of the engaging face 42b so that the engaging / disengaging operation as the connecting portion is smooth.

そして、このハウジング４０内には、径方向内側に張り出す円環状の鍔部４３が形成されており、この鍔部４３に対して固定板３０側（図３（ａ）での左側）に含油部材５０が収容され、反対側にはシール部材６０が収容されるようになっている。
また、シール部材６０が収容される側の外周面には、シール部材６０を固定するためのねじを装着するための装着穴４４が設けられている。なお、シール部材６０は、図７に示すように、円環状をなし、その内径面は、ねじ軸２のねじ溝２ａに倣うように形成されたシール面６０ａになっている。 An annular flange 43 is formed in the housing 40 so as to project radially inward, and oil is impregnated on the fixing plate 30 side (left side in FIG. 3A) with respect to the flange 43. The member 50 is accommodated, and the seal member 60 is accommodated on the opposite side.
A mounting hole 44 for mounting a screw for fixing the seal member 60 is provided on the outer peripheral surface on the side where the seal member 60 is accommodated. As shown in FIG. 7, the seal member 60 has an annular shape, and an inner diameter surface thereof is a seal surface 60 a formed so as to follow the screw groove 2 a of the screw shaft 2.

ここで、上記含油部材５０は、図６に示すように、環状体を軸方向に沿って左右二分割した半円環状の分割部５１，５２から構成されている。さらに、各分割部５１，５２は、軸方向に沿って形成された係合溝５１ｍ、５２ｍを係合部としてそれぞれ有している。
一方、上記ハウジング４０は、含油部材５０の各係合溝５１ｍ、５２ｍに嵌め込まれることで各分割部５１，５２の装着姿勢を保持する複数の突条部４８を含油部材装着姿勢保持部として有している。各突条部４８は、ハウジング４０の内周面にその径方向内側に向けて張り出すとともに軸方向に沿って形成されており、含油部材５０の各係合溝５１ｍ、５２ｍに嵌め込まれた状態にあっては、その保持する各分割部５１，５２の軸方向への移動を許容するとともに、周方向への移動を拘束するようになっている。 Here, as shown in FIG. 6, the oil-impregnated member 50 is composed of semi-annular divided portions 51 and 52 obtained by dividing the annular body into left and right parts along the axial direction. Furthermore, each division part 51 and 52 has the engaging grooves 51m and 52m formed along the axial direction as an engaging part, respectively.
On the other hand, the housing 40 has a plurality of protrusions 48, which are fitted in the respective engaging grooves 51m, 52m of the oil-impregnated member 50, to hold the attachment postures of the divided portions 51, 52 as oil-impregnated member attachment posture holding portions. is doing. Each protrusion 48 is formed on the inner peripheral surface of the housing 40 toward the inner side in the radial direction and is formed along the axial direction, and is fitted in each of the engagement grooves 51m and 52m of the oil retaining member 50. In this case, movement of the divided parts 51 and 52 held in the axial direction is allowed and the movement in the circumferential direction is restricted.

次に、このボールねじ１の作用・効果について説明する。
このボールねじ１では、ナット３の端部に含油部材装着装置１０を装着する場合は、まず、リング状の連結板２０をナット３の端部に挿入し、ナット３の内径部３ｂの複数の係合溝３ｃと連結板２０との相互の周方向の位置を合わせて、複数の係止部２３が複数の係合溝３ｃに対向する位置で相互を嵌め合わせる。 Next, functions and effects of the ball screw 1 will be described.
In this ball screw 1, when the oil retaining member mounting device 10 is mounted on the end of the nut 3, first, the ring-shaped connecting plate 20 is inserted into the end of the nut 3, and a plurality of inner diameter portions 3 b of the nut 3 are inserted. The positions of the engagement grooves 3c and the connecting plate 20 in the circumferential direction are matched, and the plurality of locking portions 23 are fitted together at positions facing the plurality of engagement grooves 3c.

このとき、複数の係止部２３が複数の係合溝３ｃに対向していない非係合位置では、複数の係止部２３の先端は、ナット３の内径部３ｂの面に当接することになるが、各係止部２３は、間隙部２４の他端側が基端部となって片持ち腕部２２で支持されているので、片持ち腕部２２が径方向内側に弾性変形することで偏倚して、内径部３ｂに摺接しつつ周方向に回動可能となる。そして、複数の係止部２３が複数の係合溝３ｃに対向した係合位置では、片持ち腕部２２が径方向外側に弾性変形（復帰）することで外側に偏倚して係合溝３ｃに係合される。なお、本実施形態では、複数の係合溝３ｃが凹の円弧状に設けられ、これに嵌め込まれる複数の係止部２３が凸の円弧状に設けられているので、相互の周方向での回転の際の係脱の動作が円滑に行える。 At this time, in a non-engagement position where the plurality of locking portions 23 are not opposed to the plurality of engaging grooves 3 c, the tips of the plurality of locking portions 23 come into contact with the surface of the inner diameter portion 3 b of the nut 3. However, since each locking portion 23 is supported by the cantilever arm portion 22 with the other end side of the gap portion 24 serving as a base end portion, the cantilever arm portion 22 is elastically deformed radially inward. It is biased and can rotate in the circumferential direction while being in sliding contact with the inner diameter portion 3b. At the engagement position where the plurality of locking portions 23 are opposed to the plurality of engagement grooves 3c, the cantilever arm portion 22 is elastically deformed (returned) radially outward to be biased outward and the engagement grooves 3c. Is engaged. In the present embodiment, the plurality of engaging grooves 3c are provided in a concave arc shape, and the plurality of engaging portions 23 fitted in the concave grooves are provided in a convex arc shape. Engagement / disengagement during rotation can be performed smoothly.

次いで、ナット３と連結板２０相互を上記係合位置に位置させ、係止部２３が係合溝３ｃに嵌ったことを確認した後に、リング状の固定板３０を連結板２０の軸方向の外側面側から被せ、固定板３０のタップ穴３３に軸方向の外側面側から軸部用ねじ９１を挿入して固定する。これにより、軸部用ねじ９１のねじ部が、連結板２０の各間隙部２４に軸方向から挿入されて、連結板２０の係止部２３の戻り防止用の軸部８０となり、複数の係止部２３の径方向内側への弾性的変位を阻止することができる。そのため、固定板３０の複数の軸部８０（この例では、軸部用ねじ９１のねじ部）で連結板２０の係止部２３を内径方向に戻らなくすることができる。なお、連結板２０側の端面には、連結板２０の内径に対してインロー部３４が形成されているので、連結板２０に固定板３０を固定する際に、ボールねじ１の軸心ＣＬと同軸に容易に装着することができる。 Next, after the nut 3 and the connecting plate 20 are positioned at the engaging position and it is confirmed that the locking portion 23 is fitted in the engaging groove 3c, the ring-shaped fixing plate 30 is moved in the axial direction of the connecting plate 20. Covering from the outer surface side, the shaft portion screw 91 is inserted and fixed to the tap hole 33 of the fixing plate 30 from the outer surface side in the axial direction. As a result, the screw portion of the shaft portion screw 91 is inserted into each gap portion 24 of the connecting plate 20 from the axial direction, and becomes a shaft portion 80 for preventing the locking portion 23 of the connecting plate 20 from returning. It is possible to prevent elastic displacement of the stop portion 23 inward in the radial direction. Therefore, it is possible to prevent the locking portion 23 of the connecting plate 20 from returning to the inner diameter direction by the plurality of shaft portions 80 of the fixing plate 30 (in this example, screw portions of the shaft portion screws 91). In addition, since the inlay part 34 is formed with respect to the internal diameter of the connection board 20 in the end surface by the side of the connection board 20, when fixing the fixing board 30 to the connection board 20, it is the axis CL of the ball screw 1 and it. Can be easily mounted on the same axis.

次いで、連結板２０および固定板３０を、軸方向から相互を締結およびその解除が可能な締結部７０によって固定する。つまり、固定板３０の外側面側から二本の締結用ねじ９２を座繰り穴３２に挿入し、タップ穴２５に螺着することで軸方向から固定することができる。 Next, the connecting plate 20 and the fixing plate 30 are fixed by a fastening portion 70 that can be fastened and released from each other in the axial direction. That is, the two fastening screws 92 can be inserted into the counterbore holes 32 from the outer surface side of the fixing plate 30 and screwed into the tap holes 25 to be fixed from the axial direction.

次いで、ハウジング４０を軸方向から装着する際は、固定板３０の係合案内面３５に対向するように、ハウジング４０の係合爪４２の周方向の位置を位置させる。次いで、上記連結部によって、ハウジング４０をナット端部に軸方向から装着する。すなわち、上記係合案内面３５に係合爪４２を軸方向から押しつけると、係合案内面３５の斜面が「カム」として作用するので、これにより係合爪４２が係合フック３６側に導かれるようにハウジング４０を周方向に円滑に廻すことができる。そして、係合フック３６との係合が開始される係合爪４２の部分には、係合用斜面４２ａが形成されているので、係合フック３６との係合も円滑になされ、これにより、軸方向からのハウジング４０の着脱を容易とし、かつ係合フック３６に係合時の拘束力を強くすることができる。そのため、このボールねじ１によれば、ナット端部に軸方向から着脱可能な連結部を有するので、ねじ軸２の軸方向からの装着作業のみによってハウジング４０の着脱も容易である。 Next, when the housing 40 is mounted from the axial direction, the circumferential position of the engagement claw 42 of the housing 40 is positioned so as to face the engagement guide surface 35 of the fixed plate 30. Next, the housing 40 is attached to the nut end portion from the axial direction by the connecting portion. That is, when the engagement claw 42 is pressed against the engagement guide surface 35 from the axial direction, the inclined surface of the engagement guide surface 35 acts as a “cam”, so that the engagement claw 42 is guided to the engagement hook 36 side. Thus, the housing 40 can be smoothly turned in the circumferential direction. And since the engaging slope 42a is formed in the part of the engaging claw 42 where the engagement with the engagement hook 36 is started, the engagement with the engagement hook 36 is also made smooth. The housing 40 can be easily attached and detached from the axial direction, and the binding force at the time of engagement with the engagement hook 36 can be increased. Therefore, according to this ball screw 1, since the nut end portion has the connecting portion that is detachable from the axial direction, the housing 40 can be easily attached and detached only by the mounting operation from the axial direction of the screw shaft 2.

このように、このボールねじ１によれば、ねじ軸２の軸方向からの装着作業のみによってハウジング４０、連結板２０および固定板３０をナット３の端部に装着することが可能である。また、ハウジング４０、連結板２０および固定板３０をナット３の端部から取り外す際には、上述とは逆の手順によって、ねじ軸２の軸方向からの作業のみによって容易に取り外すことができる。 As described above, according to the ball screw 1, the housing 40, the connecting plate 20, and the fixing plate 30 can be attached to the end portion of the nut 3 only by the attaching operation from the axial direction of the screw shaft 2. Moreover, when removing the housing 40, the connection plate 20, and the fixing plate 30 from the end portion of the nut 3, the housing 40, the connection plate 20 and the fixing plate 30 can be easily removed only by the operation from the axial direction of the screw shaft 2 by the reverse procedure.

さらに、このボールねじ１によれば、ハウジング４０内の含油部材５０のメンテナンスに際し、上記連結部の連結を軸方向から解除してナット３の端部からハウジング４０を外し、次いで、このハウジング４０をねじ軸２の軸方向に沿ってスライド移動させれば、例えば、図１７に例示したようなテーブル８から離隔した位置までハウジング４０を移動し、ハウジング４０内の含油部材５０を軸方向側面から視認可能とすることができる。 Furthermore, according to this ball screw 1, during the maintenance of the oil-impregnated member 50 in the housing 40, the connection of the connecting portion is released from the axial direction, the housing 40 is removed from the end of the nut 3, and then the housing 40 is removed. If the sliding movement is performed along the axial direction of the screw shaft 2, for example, the housing 40 is moved to a position separated from the table 8 illustrated in FIG. 17, and the oil-containing member 50 in the housing 40 is visually recognized from the axial side surface. Can be possible.

そして、この状態において、このボールねじ１によれば、含油部材装着装置１０は、含油部材５０が、環状体を軸方向に沿って分割した複数の分割部５１，５２から構成されるとともに、各分割部５１，５２は、軸方向に沿って形成された係合部として係合溝５１ｍ，５２ｍをそれぞれ有し、ハウジング４０が、含油部材５０の各係合溝５１ｍ，５２ｍに嵌め込まれることで各分割部５１，５２の装着姿勢を保持する複数の突条部４８（含油部材装着姿勢保持部）を有しており、各突条部４８は、その保持する各分割部５１，５２の軸方向への移動を許容するとともに、周方向への移動を拘束するように各係合溝５１ｍ，５２ｍに嵌め込まれるようになっているので、各分割部５１，５２を突条部４８の延設方向、つまり軸方向に沿って引き出し、ハウジング４０内から取り外すことができる。そして、この含油部材５０は、環状体を軸方向に沿って分割した複数の分割部５１，５２から構成されているから、各分割部５１，５２を径方向に取り外し可能である。 In this state, according to the ball screw 1, the oil retaining member mounting device 10 includes the oil retaining member 50 including a plurality of divided portions 51 and 52 that divide the annular body along the axial direction. The division parts 51 and 52 have engagement grooves 51m and 52m as engagement parts formed along the axial direction, respectively, and the housing 40 is fitted into the engagement grooves 51m and 52m of the oil retaining member 50. Each of the divided portions 51 and 52 has a plurality of ridge portions 48 (oil-containing member attachment posture holding portions) that hold the mounting posture, and each ridge portion 48 has an axis of each of the divided portions 51 and 52 that are held. Since the movement in the direction is allowed and the engagement grooves 51m and 52m are fitted so as to restrain the movement in the circumferential direction, the split portions 51 and 52 are extended from the ridge 48. Direction, ie along the axial direction And it can be removed from the housing 40 inside. And since this oil-impregnated member 50 is comprised from several division part 51,52 which divided | segmented the annular body along the axial direction, each division part 51,52 is removable in radial direction.

したがって、図１７に例示したようなテーブル８に、このボールねじ１が装着された状態であっても、含油部材５０のメンテナンスに際し、テーブル８からボールねじ１を取り外すことなく含油部材装着装置１０のハウジング４０をナット３の端部に対して着脱することができる。そして、テーブル８にボールねじ１が装着された状態であっても、テーブル８からボールねじ１を取り外すことなく、ねじ軸２の軸方向からの作業のみによって含油部材５０を交換することができる。 Accordingly, even when the ball screw 1 is mounted on the table 8 illustrated in FIG. 17, the oil-impregnated member mounting device 10 can be removed without removing the ball screw 1 from the table 8 during maintenance of the oil-containing member 50. The housing 40 can be attached to and detached from the end of the nut 3. Even when the ball screw 1 is mounted on the table 8, the oil-impregnated member 50 can be replaced only by the work from the axial direction of the screw shaft 2 without removing the ball screw 1 from the table 8.

以上説明したように、このボールねじ１によれば、含油部材５０をナット３端部に着脱する工程を容易にすることができる。なお、本発明に係るボールねじは、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しなければ種々の変形が可能である。
例えば、上記実施形態では、含油部材５０の係合部は、各分割部５１，５２の外周面に、軸方向に沿って形成された係合溝５１ｍ，５２ｍからなり、含油部材装着姿勢保持部は、ハウジング４０の内周面にその径方向内側に向けて張り出すとともに軸方向に沿って形成された突条部４８からなる構成例で説明したが、これに限定されるものではない。 As described above, according to this ball screw 1, the process of attaching and detaching the oil retaining member 50 to the end of the nut 3 can be facilitated. In addition, the ball screw which concerns on this invention is not limited to the said embodiment, A various deformation | transformation is possible unless it deviates from the meaning of this invention.
For example, in the above-described embodiment, the engaging portion of the oil-impregnated member 50 includes the engaging grooves 51m and 52m formed along the axial direction on the outer peripheral surfaces of the divided portions 51 and 52, and the oil-containing member mounting posture holding portion. Has been described in the configuration example including the protruding portion 48 that protrudes from the inner peripheral surface of the housing 40 toward the inside in the radial direction and is formed along the axial direction, but is not limited thereto.

例えば、図８および図９に示すように、含油部材５０の係合部として、各分割部５１，５２の側面から軸方向に沿って穿設された係合穴５１ｍ，５２ｍから構成し、含油部材装着姿勢保持部としては、ハウジング４０の内周面に形成された円環状の鍔部の側面から軸方向に向けて立設された軸部４８から構成することができる。 For example, as shown in FIGS. 8 and 9, the engaging portion of the oil retaining member 50 is constituted by engaging holes 51 m and 52 m drilled along the axial direction from the side surfaces of the divided portions 51 and 52. The member mounting posture holding portion can be constituted by a shaft portion 48 erected in the axial direction from the side surface of an annular collar formed on the inner peripheral surface of the housing 40.

１ボールねじ
２ねじ軸
３ナット
４ボール
５リニアガイド
６案内レール
７スライダ
８テーブル
９機台
１０含油部材装着装置（付帯装置）
２０連結板
３０固定板
４０ハウジング
４８突条部（含油部材装着姿勢保持部）
５０含油部材
５１，５２分割部
５１ｍ，５２ｍ係合溝（係合部）
６０シール部材
７０締結部
８０軸部
９１軸部用ねじ
９２締結用ねじ DESCRIPTION OF SYMBOLS 1 Ball screw 2 Screw shaft 3 Nut 4 Ball 5 Linear guide 6 Guide rail 7 Slider 8 Table 9 Machine base 10 Oil-impregnated member mounting device (accessory device)
20 connecting plate 30 fixing plate 40 housing 48 protrusion (oil retaining member mounting posture holding portion)
50 Oil-impregnated member 51, 52 Dividing part 51m, 52m Engaging groove (engaging part)
60 Sealing member 70 Fastening portion 80 Shaft portion 91 Shaft portion screw 92 Fastening screw

Claims

ねじ軸と、該ねじ軸にボールを介して相対回転移動自在に外嵌されるナットと、該ナット端部に含油部材を配置する付帯装置とを備えるボールねじであって、
前記付帯装置は、前記ナット端部に軸方向から着脱可能な連結部を有するとともに、自身内部に前記含油部材を収容可能な円筒状のハウジングを備え、
前記含油部材は、環状体を軸方向に沿って分割した複数の分割部から構成されるとともに、各分割部が、軸方向に沿って形成された係合部をそれぞれ有し、
前記ハウジングは、前記含油部材の各係合部に嵌め込まれることで各分割部の装着姿勢を保持する複数の含油部材装着姿勢保持部を有し、各含油部材装着姿勢保持部は、その保持する各分割部の軸方向への移動を許容するとともに、周方向への移動を拘束するように各係合部に嵌め込まれるようになっていることを特徴とするボールねじ。 A ball screw comprising: a screw shaft; a nut that is externally fitted to the screw shaft so as to be relatively rotatable through a ball; and an accessory device that disposes an oil-impregnated member at an end of the nut,
The accessory device has a connecting portion that is detachable from the axial direction at the nut end, and includes a cylindrical housing that can accommodate the oil-containing member therein.
The oil-impregnated member is composed of a plurality of divided portions obtained by dividing the annular body along the axial direction, and each divided portion has an engaging portion formed along the axial direction,
The housing has a plurality of oil retaining member mounting posture holding portions that hold the mounting postures of the divided portions by being fitted into the respective engaging portions of the oil retaining member, and each oil retaining member mounting posture holding portion holds the oil retaining member mounting posture holding portion. A ball screw characterized by being fitted into each engaging portion so as to allow movement of each divided portion in the axial direction and restrain movement in the circumferential direction.

前記含油部材の係合部は、各分割部の外周面に、軸方向に沿って形成された係合溝からなり、前記含油部材装着姿勢保持部は、前記ハウジングの内周面にその径方向内側に向けて張り出すとともに軸方向に沿って形成された突条部からなることを特徴とする請求項１に記載のボールねじ。 The engaging portion of the oil-impregnated member is formed of an engaging groove formed along the axial direction on the outer peripheral surface of each divided portion, and the oil-containing member mounting posture holding portion is radially formed on the inner peripheral surface of the housing. 2. The ball screw according to claim 1, wherein the ball screw is formed of a protruding portion that protrudes inward and is formed along the axial direction.

前記含油部材の係合部は、各分割部の側面から軸方向に沿って穿設された係合穴からなり、前記含油部材装着姿勢保持部は、前記ハウジングの内周面に形成された円環状の鍔部の側面から軸方向に向けて立設された軸部からなることを特徴とする請求項１に記載のボールねじ。 The engaging portion of the oil-impregnated member is formed of an engaging hole drilled along the axial direction from the side surface of each divided portion, and the oil-containing member mounting posture holding portion is a circle formed on the inner peripheral surface of the housing. The ball screw according to claim 1, comprising a shaft portion erected in the axial direction from a side surface of the annular flange portion.