WO2006068201A1 - ボールねじ - Google Patents
ボールねじ Download PDFInfo
- Publication number
- WO2006068201A1 WO2006068201A1 PCT/JP2005/023537 JP2005023537W WO2006068201A1 WO 2006068201 A1 WO2006068201 A1 WO 2006068201A1 JP 2005023537 W JP2005023537 W JP 2005023537W WO 2006068201 A1 WO2006068201 A1 WO 2006068201A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ball
- load
- balls
- spacer
- screw
- Prior art date
Links
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19702—Screw and nut
- Y10T74/19744—Rolling element engaging thread
- Y10T74/19749—Recirculating rolling elements
- Y10T74/19767—Return path geometry
- Y10T74/19772—Rolling element deflector
Definitions
- the present invention relates to a ball screw used for various feeding devices, and more particularly to a ball screw that requires a high load capacity, such as for a machine tool.
- Patent Document 1 Conventionally, as a ball screw used in a belt type continuously variable transmission (CVT) of an automobile or the like, there is one as shown in Patent Document 1.
- a screw shaft having a spiral screw shaft side ball rolling groove on the outer peripheral surface and a nut having a nut side ball rolling groove facing the screw shaft side ball rolling groove on the inner peripheral surface are provided. It is screwed.
- a load rolling path is formed by the screw shaft side ball rolling groove and the nut side ball rolling groove, and a large number of load balls are slidably loaded in the load rolling path. Then, when the nut rotates relative to the screw shaft, the nut moves in the axial direction via rolling of the load ball.
- each variable represents the following.
- the contact angle is an angle between a straight line connecting the ball center and the groove contact point center and a perpendicular to the screw shaft center line passing through the ball center in the cross section perpendicular to the groove.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-188705 (Fig. 1)
- the present invention has been made paying attention to the above-mentioned problems, and reduces the relative slip generated between the balls to improve the operation efficiency and prevent the load capacity and the rigidity from being lowered.
- it is an object to provide a ball screw capable of improving operability and durability.
- a screw shaft having a spiral screw shaft side ball rolling groove on an outer peripheral surface, and the screw shaft side ball rolling A nut having a nut-side ball rolling groove facing the groove on the inner peripheral surface
- a large number of load balls are loaded in the rolling contact within a load rolling path formed between the both ball rolling grooves, and a spacer ball having a diameter smaller than that of the load ball is disposed between these load balls.
- the ratio of the number of the spacer balls to the number of the load balls is in the range of 1% to 5%.
- the load ball that comes in contact with the spacer ball is in contact with the spacer ball on the far side.
- the relative slip generated between the balls is reduced, the operating efficiency of the ball screw is improved, and the wear rate of the load ball is greatly reduced.
- the ratio of the number of spacer balls to the load balls within the range of 1% to 5%, it is possible to prevent a decrease in the load capacity and rigidity of the ball screw with respect to Patent Document 1.
- the ratio of the number of spacer balls to the load balls is in the range of 1% to 5%.
- the ratio of the number of spacer balls to the load balls is 1% or more, the ball wear rate of the load balls is significantly lower than when all the balls are used as load balls. If the ratio of the number of spacer balls to the load balls exceeds 5%, the wear rate of the load balls hardly decreases. Therefore, even if the ratio of the number of spacer balls is set to exceed 5%, the wear rate of the load ball cannot be expected to decrease. Therefore, only the load capacity and rigidity of the ball screw are reduced. Therefore, the ratio of the number of spacer balls to the load balls should be in the range of 1% to 5%.
- the spacer balls are arranged evenly with respect to the row of load balls. According to the present invention, since the load balls are evenly arranged in the load rolling path, it is possible to prevent a decrease in the load capacity and rigidity of the ball screw.
- the relative slip generated between the balls is reduced with the minimum number of spacer balls, and the operation efficiency of the ball screw is improved, and the load capacity and rigidity of the ball screw are improved. Since the decrease is prevented, the operability and durability of the ball screw can be improved.
- FIG. 1 is an axial sectional view of a ball screw according to the present invention.
- FIG. 2 is a cross-sectional view of a main part of the ball screw of the present invention.
- FIG. 3 is a diagram showing the results of a durability life test for the ball screw of the present invention.
- FIG. 1 is a sectional view in the axial direction of the ball screw 1 of the present invention
- FIG. 2 is a sectional view of an essential part of FIG.
- the ball screw 1 of the present embodiment includes a screw shaft side ball rolling groove 6 and a screw shaft side ball rolling groove 6 having a helical screw shaft side ball rolling groove 6 on the outer peripheral surface.
- a nut 4 having an opposing nut side ball rolling groove 8 on its inner peripheral surface is screwed together.
- a spiral load rolling path 12 is formed by the screw shaft side ball rolling groove 6 and the nut side ball rolling groove 8, and a number of load balls are provided in the load rolling path 12. 10 is loaded freely.
- the nut 4 rotates relative to the screw shaft 2, the nut 4 moves in the axial direction via rolling of the load ball 10.
- a diameter force and a spacer ball 20 are arranged from the load ball 10.
- the load ball 10 is made of a steel material such as a high carbon chrome bearing steel, and the spacer ball 20 is made of a material having a smaller elastic modulus than the load ball 10 (for example, synthetic resin) and has a diameter of the load ball 10. Is smaller than 20 ⁇ m to 50 ⁇ m.
- the ratio of the number of spacer balls 20 to the number of load balls 10 is in the range of 1% to 5%.
- the spacer balls 20 are arranged uniformly with respect to the row of the load balls 10, and the number of the load balls 10 arranged between the spacer balls 20 is uniform.
- the ratio of the number of spacer balls 20 to the number of load balls 10 is 5%, that is, the number of spacer balls 20 arranged between the load balls 10 in the present invention. It shows the most frequent state. That is, the ratio of the number of spacer balls to the number of load balls is 19: 1 (5%).
- a substantially U-shaped circulation tube 14 is attached to the outer peripheral surface of the nut 4, and a return passage 16 is formed in the circulation tube 14 so that both ends thereof communicate with the load rolling path 12. Yes.
- the load rolling path 12 and the return path 16 form an infinite circulation path for the load ball 10 and the spacer ball 20.
- the nut 4 rotates relative to the screw shaft 2, and the nut 4
- the load ball 10 and the spacer ball 20 circulate while rolling in the endless circuit.
- the load ball 10 comes into contact with the spacer ball 20! /
- the load ball 10 comes into contact with the spacer ball 20! / Therefore, the relative slip generated between the balls is reduced.
- the relative slip generated between the balls when the nut 4 rotates relative to the screw shaft 2 is reduced.
- the operability of the ball screw 1 can be improved.
- the ratio of the number of spacer balls 20 to the number of load balls 10 is in the range of 1% to 5%, the load capacity and rigidity of the ball screw are hardly reduced with the minimum number of spacer balls. It is possible to reduce initial wear that occurs in the load ball 10 without lowering. Therefore, the durability of the ball screw 1 can be improved.
- Fig. 3 shows the number of spacer balls 2 with respect to the number of load balls 10 when an excessive load is applied to the ball screw 1 of the present embodiment using an existing ball screw durability life tester.
- the overload is set to 30000 N
- the initial wear amount of the load ball 10 is defined as the wear rate of the load ball 10 after traveling 100 km.
- Ball screw identification number NSK ball screw 50 X 10 X 1000— C5
- Lubricating grease Bulgaria No. 2 (Showa Shell Sekiyu)
- the ratio of the number of spacer balls 20 to the number of load balls 10 (hereinafter referred to as the spacer ball ratio) is 0%, 1%, 2%, 3%, 4%, 5%, 20%, Durability life tests were conducted at 10% of 25%, 33.4%, and 50%, and at each spacer ball ratio.
- the vertical axis in the figure indicates the ball wear rate, and the horizontal axis indicates the spacer ball ratio!
- the ball wear rate is a value obtained by averaging the rate of change of dimensions generated in the load ball 10 after traveling 100 km in the endurance life test at each spacer ball ratio.
- the spacer ball ratio when the spacer ball ratio is 1% or more, the ball wear rate of the load ball 10 is significantly lower than that when the spacer ball ratio is 0%. To do. In addition, when the spacer ball ratio exceeds 5%, the wear rate of the load ball hardly decreases.
- the spacer ball ratio within the range of 1% to 5% (in the range indicated by R in the figure), the wear rate of the load ball 10 is greatly increased with the minimum number of spacer balls.
- the load capacity and rigidity of the ball screw 1 can be hardly reduced and the load resistance of the ball screw 1 can be improved. Further, since the wear rate of the load ball 10 is significantly reduced, the life of the ball screw 1 can be extended.
- the spacer balls 20 are evenly arranged with respect to the row of the load balls 10, the load load is evenly distributed with respect to the load balls 10 loaded in the load rolling path 12.
- the durability of the ball screw 1 can be improved.
- the spacer balls 20 are evenly arranged between the many load balls 10.
- the present invention is not limited to this.
- the number of load balls 10 may be different!
- the force that forms the diameter of the spacer ball 20 to be about 20 m to 50 m smaller than the diameter of the ball 10 is not limited to this, and the diameter of the spacer ball 20 is not limited to this. It only needs to be smaller than the diameter of the ball 10.
- the relative slip generated between the balls is reduced with the minimum number of spacer balls, and the operation efficiency of the ball screw is improved, and the load capacity and rigidity of the ball screw are prevented from being lowered. Therefore, a ball screw with improved operability and durability is provided.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/722,530 US20080127763A1 (en) | 2004-12-22 | 2005-12-21 | Ball Screw |
EP05820371A EP1830105A1 (en) | 2004-12-22 | 2005-12-21 | Ball screw |
JP2006549042A JPWO2006068201A1 (ja) | 2004-12-22 | 2005-12-21 | ボールねじ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004370816 | 2004-12-22 | ||
JP2004-370816 | 2004-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006068201A1 true WO2006068201A1 (ja) | 2006-06-29 |
Family
ID=36601798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/023537 WO2006068201A1 (ja) | 2004-12-22 | 2005-12-21 | ボールねじ |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080127763A1 (ja) |
EP (1) | EP1830105A1 (ja) |
JP (1) | JPWO2006068201A1 (ja) |
CN (1) | CN101087967A (ja) |
WO (1) | WO2006068201A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009103257A (ja) * | 2007-10-25 | 2009-05-14 | Jtekt Corp | ボールスプライン付きボールねじ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6295469B2 (ja) * | 2014-02-27 | 2018-03-20 | 日立オートモティブシステムズ株式会社 | パワーステアリング装置およびパワーステアリング装置の製造方法 |
JP6954220B2 (ja) * | 2018-04-24 | 2021-10-27 | 日本精工株式会社 | ボールねじ |
EP3971448B1 (de) * | 2020-09-22 | 2023-04-26 | SFS Group International AG | Kugelgewindetrieb und spindelmutter hierfür |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54153962A (en) * | 1978-05-25 | 1979-12-04 | Hitachi Medical Corp | Ball screw |
JP2002188705A (ja) * | 2000-12-22 | 2002-07-05 | Ntn Corp | ボールねじ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2844044A (en) * | 1955-11-21 | 1958-07-22 | Electrical Engineering & Mfg C | Antifriction screw device |
US3053105A (en) * | 1955-11-21 | 1962-09-11 | Electronic Specialty Co | Anti-friction screw device |
US6113274A (en) * | 1999-04-15 | 2000-09-05 | Tsubaki Nakashima Co., Ltd. | Linear guideway having spacers and spacer ball |
US6499374B1 (en) * | 2001-07-30 | 2002-12-31 | Tsubaki Nakashima Co., Ltd. | Ball screw with alternately disposed steel balls and ceramic balls |
-
2005
- 2005-12-21 US US11/722,530 patent/US20080127763A1/en not_active Abandoned
- 2005-12-21 CN CNA2005800441624A patent/CN101087967A/zh active Pending
- 2005-12-21 WO PCT/JP2005/023537 patent/WO2006068201A1/ja active Application Filing
- 2005-12-21 JP JP2006549042A patent/JPWO2006068201A1/ja active Pending
- 2005-12-21 EP EP05820371A patent/EP1830105A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54153962A (en) * | 1978-05-25 | 1979-12-04 | Hitachi Medical Corp | Ball screw |
JP2002188705A (ja) * | 2000-12-22 | 2002-07-05 | Ntn Corp | ボールねじ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009103257A (ja) * | 2007-10-25 | 2009-05-14 | Jtekt Corp | ボールスプライン付きボールねじ |
Also Published As
Publication number | Publication date |
---|---|
US20080127763A1 (en) | 2008-06-05 |
CN101087967A (zh) | 2007-12-12 |
JPWO2006068201A1 (ja) | 2008-06-12 |
EP1830105A1 (en) | 2007-09-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1734285B1 (en) | Ball screw | |
CN1258044C (zh) | 滚柱推力轴承 | |
US7201076B2 (en) | Ball screw | |
JP4834921B2 (ja) | コンプレッサ用プーリの回転支持装置 | |
US7640820B1 (en) | Ball screw assembly and spacer elements therefor | |
WO2006068201A1 (ja) | ボールねじ | |
JP5178889B2 (ja) | ボールねじ | |
US20030031527A1 (en) | Ball screw apparatus | |
CN1873225A (zh) | 滚柱推力轴承 | |
EP1347187B1 (en) | Linear motion device | |
JPH09291942A (ja) | ラジアル転がり軸受 | |
JP2001021018A (ja) | ボールねじ | |
JP2006083988A (ja) | ボールねじ | |
KR100657657B1 (ko) | 베어링 스크류 이송장치 | |
JP2007127240A (ja) | ボールねじ,電動射出成形機,及び電動プレス装置 | |
EP1318330B1 (en) | Ball screw apparatus | |
JP2008298237A (ja) | ボールねじ | |
US6231242B1 (en) | Double row ball bearing | |
JP4459545B2 (ja) | ボールねじ装置 | |
JP2005155714A (ja) | ボールねじ | |
US20030121348A1 (en) | Ball screw apparatus | |
JP2005003104A (ja) | ボールねじ | |
JP2004084935A (ja) | ボールねじ | |
JP2005003103A (ja) | ボールねじ | |
JP3506853B2 (ja) | ボールねじ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006549042 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580044162.4 Country of ref document: CN Ref document number: 2005820371 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11722530 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 2005820371 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11722530 Country of ref document: US |