JP2010151168A - Ball external circulation type ball screw - Google Patents
Ball external circulation type ball screw Download PDFInfo
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- JP2010151168A JP2010151168A JP2008327546A JP2008327546A JP2010151168A JP 2010151168 A JP2010151168 A JP 2010151168A JP 2008327546 A JP2008327546 A JP 2008327546A JP 2008327546 A JP2008327546 A JP 2008327546A JP 2010151168 A JP2010151168 A JP 2010151168A
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- 238000005096 rolling process Methods 0.000 claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 238000005452 bending Methods 0.000 claims description 23
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
本発明は、ボールねじに係り、特にボール外部循環式ボールねじに関するものである。 The present invention relates to a ball screw, and more particularly to a ball external circulation ball screw.
目下、ボールねじは各種類の工作機械(例えば、フライス盤の工作テーブル、研磨盤の工作テーブル、旋盤の工作テーブルやボール盤の工作テーブルなど)に使用されており、上下左右に移動可能であることが必要であるため、工作機械の工作テーブルはボールねじを利用する。転がり子の流動方向により、ボールねじは、ボール内部循環式ボールねじと、ボール外部循環式ボールねじと、に分けられ、なお、本発明はボール外部循環式ボールねじに関するものである。ボール外部循環式ボールねじは、転がり子の回流がボールねじの外部で完成するものである。 Currently, ball screws are used in various types of machine tools (for example, milling machine table, polishing machine table, lathe machine table, drilling machine table, etc.) and can be moved vertically and horizontally Because it is necessary, the machine table of the machine tool uses a ball screw. The ball screw is classified into a ball internal circulation type ball screw and a ball external circulation type ball screw according to the flow direction of the rolling elements, and the present invention relates to a ball external circulation type ball screw. The ball external circulation type ball screw is one in which the rotation of the rolling element is completed outside the ball screw.
例えば米国特許第3,143,896号公報は、図1に示すように、循環子11が二つの脚部111を介してナット12内に組み付けられており、その循環経路112が負荷経路121と連通しており、転がり子13が前記循環経路112と負荷経路121とを通過可能であり、しかし、循環経路112がねじ軸14の軸方向と垂直するので、循環経路112の進出口の曲がり箇所113では、転がり子13が衝突し易く、そうすると、騒音が発生し、循環子11の寿命が短くなるという欠点があった。 For example, in US Pat. No. 3,143,896, as shown in FIG. 1, the circulator 11 is assembled in the nut 12 via two legs 111, and the circulation path 112 communicates with the load path 121. The rolling element 13 can pass through the circulation path 112 and the load path 121, but the circulation path 112 is perpendicular to the axial direction of the screw shaft 14. The child 13 easily collides, so that noise is generated and the life of the circulator 11 is shortened.
また、例えば米国特許第7,040,189号公報は、図2に示すように、循環経路151がねじ軸(図示せず)の軸方向と垂直するので、循環経路151の進出口の曲がり箇所152では、転がり子13に衝突されて欠陥が発生し、また、循環子15は、左右のピースを結合してナット(図示せず)に組付けられ、循環子15の循環経路151の進出口の曲がり箇所152では衝撃点があるので、循環子15が衝撃されて離間することを防止するために、補強構造を別に設けることが必要であるが、生産コストが増加する欠点があった。
そこで、本発明の主な目的は、組み付けられた循環経路がねじ軸の軸方向と垂直しないようにすることにより、転がり子が循環経路の進出口の曲がり箇所に直接衝突しなくなるボール外部循環式ボールねじを提供することにある。 Therefore, the main object of the present invention is to prevent the ball from circulating directly into the bent portion of the exit of the circulation path by preventing the assembled circulation path from being perpendicular to the axial direction of the screw shaft. It is to provide a ball screw.
本発明の次の目的は、合せラインが循環経路の輪郭ラインに沿い、上下に設けられた、内蓋と、外蓋と、によって循環子を構成することにより、転がり子が循環経路の曲がり箇所に直接衝突しなくなるボール外部循環式ボールねじを提供することにある。 Another object of the present invention is to form a circulator by an inner lid and an outer lid, which are provided at the top and bottom along the contour line of the circulation path, so that the rolling element is bent at the circulation path. It is an object of the present invention to provide an external circulation ball screw that does not directly collide with the ball.
上記課題を解決するために、本発明の請求項1に記載のボール外部循環式ボールねじによると、ねじ軸と、ナットと、循環子と、循環経路と、複数の転がり子と、を含むボール外部循環式ボールねじにおいて、前記ねじ軸は、周面には転がり溝が開設されており、前記ナットは、その中心には前記ねじ軸を挿通するための貫通孔が開設されており、前記貫通孔の周面には転がり溝が開設されており、前記ねじ軸の転がり溝と前記ナットの転がり溝とから負荷経路が形成され、前記循環子は、両端がそれぞれ第一脚部と第二脚部とであり、前記第一脚部と前記第二脚部とは、前記ナットに設けられており、その間には連接部が設けられており、前記循環経路は、前記循環子の内部に設けられており、前記第一脚部と前記連接部と前記第二脚部とを貫通しており、前記負荷経路と連通しており、前記循環経路の両端は、進出段と、前記進出段と連続している第一曲がり段と、前記第一曲がり段と連続している第二曲がり段と、前記第二曲がり段の間に設けられた連接段と、を有し、前記ねじ軸の軸方向から見れば、前記第一曲がり段が直線を呈し、前記ねじ軸の径方向から見れば、前記第二曲がり段が半円曲線を呈し、前記複数の転がり子は、前記負荷経路と前記循環経路とを転がり可能であることを特徴とするボール外部循環式ボールねじである。 In order to solve the above problems, according to the ball external circulation type ball screw according to claim 1 of the present invention, a ball including a screw shaft, a nut, a circulator, a circulation path, and a plurality of rolling elements. In the external circulation type ball screw, the screw shaft is provided with a rolling groove on the peripheral surface, and the nut is provided with a through-hole through which the screw shaft is inserted at the center thereof. A rolling groove is formed in the peripheral surface of the hole, and a load path is formed from the rolling groove of the screw shaft and the rolling groove of the nut, and both ends of the circulator are a first leg and a second leg, respectively. The first leg and the second leg are provided on the nut, and a connecting part is provided between them, and the circulation path is provided inside the circulator. The first leg, the connecting part, and the second leg. Penetrating and communicating with the load path, and both ends of the circulation path are an advancing stage, a first bending stage continuous with the advancing stage, and a first bending stage continuous with the first bending stage. A second bending step, and a connecting step provided between the second bending steps, and when viewed from the axial direction of the screw shaft, the first bending step exhibits a straight line, and the radial direction of the screw shaft As seen from the above, the second bending stage has a semicircular curve, and the plurality of rolling elements can roll between the load path and the circulation path.
本発明の請求項2に記載のボール外部循環式ボールねじによると、前記ねじ軸の軸方向から見れば、前記第一曲がり段が曲線を呈し、前記ねじ軸の径方向から見れば、前記第二曲がり段が半円曲線を呈する。 According to the ball external circulation type ball screw according to claim 2 of the present invention, when viewed from the axial direction of the screw shaft, the first bending step exhibits a curve, and when viewed from the radial direction of the screw shaft, the first Two bends have a semicircular curve.
本発明の請求項3に記載のボール外部循環式ボールねじによると、前記ナットの外周面には切り面が設けられており、前記ナットに前記循環子を組合せた後、前記連接部は、大部分が前記切り面の一側に位置しており、一部が前記切り面の他側に位置している。 According to the ball external circulation type ball screw according to claim 3 of the present invention, a cut surface is provided on the outer peripheral surface of the nut, and after the circulating element is combined with the nut, the connecting portion is large. The part is located on one side of the cut surface, and a part is located on the other side of the cut surface.
本発明の請求項4に記載のボール外部循環式ボールねじによると、前記循環子は、内蓋と、外蓋と、から構成され、前記ねじ軸の軸方向から見れば、前記内蓋と前記外蓋とはそれぞれ上下に位置している。 According to the ball external circulation type ball screw according to claim 4 of the present invention, the circulator is composed of an inner lid and an outer lid, and when viewed from the axial direction of the screw shaft, the inner lid and the outer lid The outer lid is positioned above and below.
本発明の請求項5に記載のボール外部循環式ボールねじによると、前記循環子の前記内蓋と前記外蓋とは樹脂で作製されたものである。 According to the ball external circulation type ball screw according to claim 5 of the present invention, the inner lid and the outer lid of the circulator are made of resin.
本発明のボール外部循環式ボールねじによれば、次のような効果がある。
(1)循環経路の曲がり箇所を第一曲がり段と第二曲がり段とに設計され、ねじ軸の軸方向から見れば、第一曲がり段が曲線を呈し、ねじ軸の径方向から見れば、第二曲がり段が半円曲線を呈するようにすることにより、組み付けられた循環子の循環経路の進行方向がねじ軸の軸方向と垂直しないので、進行している転がり子が循環経路の進出口の曲がり箇所に直接衝突しなくなり、騒音が低減され、循環子の寿命が従来のものよりも更に長く延びる。
The ball external circulation type ball screw of the present invention has the following effects.
(1) The bent portion of the circulation path is designed as a first bent step and a second bent step, and when viewed from the axial direction of the screw shaft, the first bent step exhibits a curve, and when viewed from the radial direction of the screw shaft, By making the second bending step exhibit a semicircular curve, the traveling direction of the circulation path of the assembled circulator is not perpendicular to the axial direction of the screw shaft. No longer directly colliding with the bent portion of the coil, noise is reduced, and the life of the circulator is extended longer than the conventional one.
(2)合せラインが循環経路の輪郭ラインに沿い、上下に設けられた、内蓋と、外蓋と、によって循環子を構成することにより、転がり子が循環経路の曲がり箇所に直接衝突しなくなり、循環子が衝撃されて離間することがなくなる。 (2) By forming the circulator by the inner lid and the outer lid, which are provided on the upper and lower sides along the contour line of the circulation path, the rolling element does not directly collide with the bent part of the circulation path. The circulator will not be separated by being impacted.
以下、添付図面を参照して本発明の好適な実施の形態を詳細に説明する。
まず、図3乃至図6を参照する。本発明の実施例に係るボール外部循環式ボールねじは、ねじ軸20と、ナット30と、三つの循環子40と、三つの循環経路50と、複数の転がり子と、から構成される。
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
First, reference will be made to FIGS. The ball external circulation type ball screw according to the embodiment of the present invention includes a screw shaft 20, a nut 30, three circulation elements 40, three circulation paths 50, and a plurality of rolling elements.
ねじ軸20は、周面には転がり溝21が開設されている。 The screw shaft 20 is provided with a rolling groove 21 on the circumferential surface.
ナット30は、その中心にはねじ軸20を挿通するための貫通孔31が開設されており、貫通孔31の周面には転がり溝(図示せず)が開設されており、ねじ軸の転がり溝21とナットの前記転がり溝とから負荷経路(図示せず)が形成される。また、ナット30の外周面には切り面32が設けられている。 The nut 30 has a through-hole 31 through which the screw shaft 20 is inserted, and a rolling groove (not shown) is formed in the peripheral surface of the through-hole 31 to roll the screw shaft. A load path (not shown) is formed from the groove 21 and the rolling groove of the nut. A cut surface 32 is provided on the outer peripheral surface of the nut 30.
三つの循環子40は、構造が同様であり、内蓋41と、外蓋42と、から構成され、内蓋42と外蓋41とは樹脂で作製されたものであり、外蓋41の両側の側面には互いに対応するラグ411が設けられており、ラグ411がねじCを介してナット30に固定されている。各循環子40は、両端がそれぞれ第一脚部43と第二脚部44とであり、第一脚部43と第二脚部44とは、ナット30の切り面32に設けられており、その間には連接部45が設けられており、連接部45は、大部分が切り面32の一側に位置しており、一部が切り面32の他側に位置しており、ねじ軸20の軸方向Aから見れば、内蓋42と外蓋41とはそれぞれ上下に位置されている。 The three circulators 40 have the same structure and are composed of an inner lid 41 and an outer lid 42, and the inner lid 42 and the outer lid 41 are made of resin. Lugs 411 corresponding to each other are provided on the side surfaces of the, and the lugs 411 are fixed to the nut 30 via screws C. Each circulator 40 has a first leg 43 and a second leg 44 at both ends, and the first leg 43 and the second leg 44 are provided on the cut surface 32 of the nut 30. In the meantime, a connecting portion 45 is provided, and most of the connecting portion 45 is located on one side of the cut surface 32, and a part thereof is located on the other side of the cut surface 32. When viewed from the axial direction A, the inner lid 42 and the outer lid 41 are positioned vertically.
三つの循環経路50は、図7乃至図9に示すように、それぞれ三つの循環子40の内部に設けられており、第一脚部43と連接部45と第二脚部44とを貫通しており、前記負荷経路と連通しており、循環経路50の両端は、進出段51と、進出段51と連続している第一曲がり段52と、第一曲がり段52と連続している第二曲がり段53と、第二曲がり段53の間に設けられた連接段54と、を有し、ねじ軸20の軸方向Aから見れば、直線を呈する進出段51が第一曲がり段52と同じ平面に位置しており、なお、ねじ軸20の軸方向Aから見れば、第一曲がり段52が直線を呈し、なお、ねじ軸20の径方向Bから見れば、第一曲がり段52が曲線を呈し、ねじ軸20の径方向Bから見れば、第二曲がり段53が半円曲線を呈し、なお、ねじ軸20の軸方向Aから見れば、第二曲がり段53も半円曲線を呈する。 As shown in FIGS. 7 to 9, the three circulation paths 50 are respectively provided in the three circulators 40, and pass through the first leg portion 43, the connecting portion 45, and the second leg portion 44. The both ends of the circulation path 50 are connected to the advancing stage 51, the first bending stage 52 that is continuous with the advancing stage 51, and the first bending stage 52 that is continuous with the first bending stage 52. When viewed from the axial direction A of the screw shaft 20, the advancing step 51 having a straight line has a second bending step 53 and a connecting step 54 provided between the second bending step 53 and the first bending step 52. The first bending step 52 has a straight line when viewed from the axial direction A of the screw shaft 20 and the first bending step 52 is viewed from the radial direction B of the screw shaft 20. If it shows a curve and it sees from the radial direction B of the screw shaft 20, the 2nd bending step 53 will show a semicircle curve, , When viewed from the axial direction A of the screw shaft 20, also the second bending stage 53 exhibits a semi-circular curve.
複数の転がり子(図示せず)は、前記負荷経路と循環経路50とを転がり可能である。 A plurality of rolling elements (not shown) can roll the load path and the circulation path 50.
11 循環子
12 ナット
13 転がり子
14 ねじ軸
15 循環子
20 ねじ軸
21 転がり溝
30 ナット
31 貫通孔
32 切り面
40 循環子
41 外蓋
42 内蓋
43 第一脚部
44 第二脚部
45 連接部
50 循環経路
51 進出段
52 第一曲がり段
53 第二曲がり段
54 連続段
111 脚部
112 循環経路
113 曲がり箇所
121 負荷経路
151 循環経路
152 曲がり箇所
A 軸方向
B 径方向
C ねじ
DESCRIPTION OF SYMBOLS 11 Circulator 12 Nut 13 Roller 14 Screw shaft 15 Circulator 20 Screw shaft 21 Rolling groove 30 Nut 31 Through-hole 32 Cut surface 40 Circulator 41 Outer lid 42 Inner lid 43 First leg 44 Second leg 45 Connecting part 50 Circulation path 51 Advance stage 52 First bend stage 53 Second bend stage 54 Continuous stage 111 Leg 112 Circulation path 113 Bend part 121 Load path 151 Circulation path 152 Bend part A Axial direction B Radial direction C Screw
Claims (5)
前記ねじ軸は、周面には転がり溝が開設されており、
前記ナットは、その中心には前記ねじ軸を挿通するための貫通孔が開設されており、前記貫通孔の周面には転がり溝が開設されており、前記ねじ軸の転がり溝と前記ナットの転がり溝とから負荷経路が形成され、
前記循環子は、両端がそれぞれ第一脚部と第二脚部とであり、前記第一脚部と前記第二脚部とは、前記ナットに設けられており、その間には連接部が設けられており、
前記循環経路は、前記循環子の内部に設けられており、前記第一脚部と前記連接部と前記第二脚部とを貫通しており、前記負荷経路と連通しており、前記循環経路の両端は、進出段と、前記進出段と連続している第一曲がり段と、前記第一曲がり段と連続している第二曲がり段と、前記第二曲がり段の間に設けられた連接段と、を有し、前記ねじ軸の軸方向から見れば、前記第一曲がり段が直線を呈し、前記ねじ軸の径方向から見れば、前記第二曲がり段が半円曲線を呈し、
前記複数の転がり子は、前記負荷経路と前記循環経路とを転がり可能であることを特徴とする、ボール外部循環式ボールねじ。 In a ball external circulation type ball screw including a screw shaft, a nut, a circulator, a circulation path, and a plurality of rolling elements,
The screw shaft has a rolling groove on its peripheral surface,
The nut has a through-hole for inserting the screw shaft in the center thereof, and a rolling groove is formed in a peripheral surface of the through-hole, and the rolling groove of the screw shaft and the nut A load path is formed from the rolling groove,
Both ends of the circulator are respectively a first leg portion and a second leg portion, and the first leg portion and the second leg portion are provided on the nut, and a connecting portion is provided therebetween. And
The circulation path is provided inside the circulator, passes through the first leg portion, the connection portion, and the second leg portion, communicates with the load path, and the circulation path. The two ends of the joint are provided between an advancing stage, a first bent stage continuous with the advanced stage, a second bent stage continuous with the first bent stage, and the second bent stage. And when viewed from the axial direction of the screw shaft, the first bending step exhibits a straight line, and when viewed from the radial direction of the screw shaft, the second bending step exhibits a semicircular curve,
The ball external circulation type ball screw, wherein the plurality of rolling elements can roll between the load path and the circulation path.
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CN110375048A (en) * | 2019-08-06 | 2019-10-25 | 深圳市威远精密技术有限公司 | A kind of embedded interior circulation ball nut |
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JP5818925B2 (en) | 2014-02-13 | 2015-11-18 | Thk株式会社 | Ball screw device |
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JPH1151049A (en) * | 1997-07-31 | 1999-02-23 | Thk Kk | Tube type ball screw device |
JP2006125578A (en) * | 2004-10-29 | 2006-05-18 | Nsk Ltd | Ball screw |
JP2008202669A (en) * | 2007-02-19 | 2008-09-04 | Thk Co Ltd | Screw device series and screw device |
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WO2012077247A1 (en) * | 2010-12-08 | 2012-06-14 | 日本精工株式会社 | Ball screw device |
JP5500268B2 (en) * | 2010-12-08 | 2014-05-21 | 日本精工株式会社 | Ball screw device |
US9003911B2 (en) | 2010-12-08 | 2015-04-14 | Nsk Ltd. | Ball screw device |
CN110375048A (en) * | 2019-08-06 | 2019-10-25 | 深圳市威远精密技术有限公司 | A kind of embedded interior circulation ball nut |
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