WO2006033397A1 - ボールねじ機構 - Google Patents
ボールねじ機構 Download PDFInfo
- Publication number
- WO2006033397A1 WO2006033397A1 PCT/JP2005/017495 JP2005017495W WO2006033397A1 WO 2006033397 A1 WO2006033397 A1 WO 2006033397A1 JP 2005017495 W JP2005017495 W JP 2005017495W WO 2006033397 A1 WO2006033397 A1 WO 2006033397A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ball
- screw shaft
- screw
- circulation path
- groove
- 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
- F16H25/2228—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 the device for circulation forming a part of the screw member
-
- 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
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
-
- 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
Definitions
- the present invention relates to a ball screw mechanism that is assembled to a general industrial machine or used in an automobile.
- a ball screw mechanism has a screw shaft, a nut, and a ball that rolls in a rolling path formed between them and a force that also has a force.
- One piece of force A piece or tube is attached to the nut to return the ball to the other end.
- a top or tube is provided on the nut, the thickness of the nut increases, and interference with surrounding parts may become a problem.
- Patent Document 1 discloses a ball screw structure in which a circulation path is formed on a screw shaft. According to the powerful ball screw structure, the thickness of the nut can be reduced. Patent Document 1: JP 2003-97663 A
- the present invention has been made in view of the problems of the prior art, and is compact.
- An object of the present invention is to provide a ball screw mechanism that can ensure a smooth operation.
- a nut arranged so as to surround the screw shaft and having an internal thread groove formed on an inner peripheral surface thereof, and a plurality of Bonores arranged so as to be able to roll along a rolling path formed between the opposing screw grooves,
- the screw shaft forms a circulation path that connects one end and the other end of the male screw groove, and when the ball is directed toward one end force of the male screw groove, the axis of the screw shaft And when moving from the circulation path to the other end of the male screw groove, the axial force of the screw shaft is reduced.
- the distance from the axis of the screw shaft to the edge of the side wall at the end of the circulation path is larger than 1Z2 of the ball center distance (hereinafter referred to as BCD).
- the width of the circulation path is preferably larger than the groove width of the male screw groove.
- the land portion of the screw shaft cannot guide the ball and is likely to be locked.
- the ball since the distance from the axis of the screw shaft to the edge of the side wall at the end of the circulation path is increased from 1Z2 of the BCD, the ball has a depth of the circulation path.
- the land portion of the screw shaft serves as a guide for the ball, so that the ball can be circulated smoothly.
- the range in which the land portion of the screw shaft is larger than the BCD is sufficient to guide the ball at least as long as the ball starts to circulate (for example, in the vicinity of the one end and the other end). Even if it is provided over the entire circumference, it does not affect the operation of the ball screw. Further, in order to exert the effects of the present invention, not only when the land portion of the screw shaft is larger than the BCD, but at least the axial force of the screw shaft and the distance force to the edge of the side wall at the end of the circulation path 1Z2 of the BCD Larger is enough. [0010]
- the circulation path is formed directly on the outer peripheral surface of the screw shaft.
- FIG. 1 is a cross-sectional view of a ball screw mechanism according to the present embodiment.
- FIG. 2 is an enlarged view showing a part indicated by an arrow II in the configuration of FIG.
- FIG. 3 is an exploded perspective view of the ball screw mechanism of the present embodiment.
- FIG. 4 A view of the circulation path lb as seen from the side force of the screw shaft 1.
- FIG. 5 is a view of the configuration of FIG. 4 taken along the line V-V and viewed in the direction of the arrow.
- FIG. 6 is a view of the configuration of FIG. 4 taken along the VI-VI line and viewed in the direction of the arrow.
- a male screw groove la is formed on the outer peripheral surface of the screw shaft 1 connected to the driven member and supported so as not to rotate and to move only in the axial direction.
- a cylindrical nut 2 supported so as to be rotatable only with respect to a housing (not shown) is arranged so as to surround the screw shaft 1 and has a female screw groove 2a formed on an inner peripheral surface thereof.
- a plurality of balls 3 are arranged so as to be able to roll freely in a spiral rolling path formed between both opposing screw grooves.
- the male screw groove la provided with a plurality of (only two shown in the figure) terminates when the circumference of the screw shaft 1 is slightly wound around one round, and one end and the other The circuit lb is connected to the end. A land portion lc is formed between adjacent male screw grooves la.
- FIG. 4 is a view of the circuit lb as viewed from the side of the screw shaft 1
- FIG. 5 is a view of the configuration of FIG. 4 cut along the VV line and seen in the direction of the arrow
- FIG. Fig. 5 is a view of the configuration of Fig. 4 taken along line VI-VI and viewed in the direction of the arrow.
- the circulation path lb formed directly on the outer peripheral surface of the screw shaft 1 is on the screw shaft 1 side.
- it has a meandering groove shape to connect one end and the other end of the male thread groove la, and becomes deeper toward the center as shown in FIG. 6 (in the axis O of the screw shaft 1). It has a shape that approaches.
- the end E1 and the other end E2 of the male thread groove la and the circulation path lb are connected with a smooth curved surface so that the ball 3 can circulate smoothly. .
- the center-to-center distance BCD of the ball 3 is smaller than the outer diameter ⁇ of the land portion lc of the screw shaft 1. Further, as shown in FIGS. 4 and 5, the groove width W2 of the circulation path lb is larger than the groove width W1 of the male screw groove la.
- the ball 3 approaches the axis O of the screw shaft 1 when the force is applied to the circulation path lb from one end E1 of the male screw groove la, and the circulation path lb When rolling from the other end E2 of the male thread groove 1, it rolls so that the axial line O force of the screw shaft 1 moves away.
- the outer diameter ⁇ of the land portion lc (which forms the side wall of the circulation path lb) is smaller than BCD, the land portion lc of the screw shaft 1 cannot properly guide the ball, and the land portion of the nut 2 Stagnation is likely to occur between the two.
- the ball 3 since the outer diameter ⁇ of the land portion lc is larger than that of the BCD, the ball 3 is in a deep portion of the circulation path lb (a portion close to the axis O of the screw shaft 1).
- the land part lc of the screw shaft 1 serves as a guide for the ball 3, whereby the ball 3 can be smoothly circulated.
- at least the axis line of the screw shaft 1 is not required to be larger than the BCD over the entire circumference, and the distance to the edge of the side wall at the end of the circulation path lb (in FIG. ⁇ / 2) Force BC Larger than 1Z2 is sufficient.
- the groove width W2 of the circulation path lb is larger than the groove width W1 of the male thread groove la. Therefore, it is easy to secure the track space of the ball 3 in the circulation path lb. In addition, a no-load region can be formed, thereby ensuring a smooth circulation.
- the present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be appropriately changed or improved.
- the cross-sectional shape of the circulation path lb shown in FIG. 5 is a single R (however, a straight line outside BCD or a curve larger than a single R) in this embodiment, but it can also be a Gothic arc shape. is there.
- FIG. 1 is a cross-sectional view of the ball screw mechanism according to the present embodiment
- FIG. 2 is an enlarged view of the portion indicated by arrow II in the configuration of FIG. 1
- FIG. 3 is the present embodiment. It is a disassembled perspective view of the ball screw mechanism.
- a ball screw mechanism that can ensure a smooth operation while being compact can be applied to general industrial machines and automobiles.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05785608A EP1811204A1 (en) | 2004-09-24 | 2005-09-22 | Ball screw mechanism |
US11/663,720 US20080078264A1 (en) | 2004-09-24 | 2005-09-22 | Ball Screw Mechanism |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004276387A JP2006090421A (ja) | 2004-09-24 | 2004-09-24 | ボールねじ機構 |
JP2004-276387 | 2004-09-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006033397A1 true WO2006033397A1 (ja) | 2006-03-30 |
Family
ID=36090151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/017495 WO2006033397A1 (ja) | 2004-09-24 | 2005-09-22 | ボールねじ機構 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080078264A1 (ja) |
EP (1) | EP1811204A1 (ja) |
JP (1) | JP2006090421A (ja) |
WO (1) | WO2006033397A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005344782A (ja) * | 2004-06-01 | 2005-12-15 | Ntn Corp | ボールねじ |
JP2010286072A (ja) * | 2009-06-12 | 2010-12-24 | Ntn Corp | ボールねじおよびこれを備えた無段変速機のプーリ幅調整装置 |
CN103228953B (zh) * | 2010-11-15 | 2016-04-27 | 日本精工株式会社 | 滚珠丝杠 |
JP6581643B2 (ja) | 2017-11-28 | 2019-09-25 | Thk株式会社 | ボールねじスプライン |
EP3996974B1 (en) | 2019-07-12 | 2023-08-30 | R.H. Sheppard Co., Inc. | Coupled steering gear shaft |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB526735A (en) * | 1939-03-15 | 1940-09-24 | Giuseppe Gianetti | Improvements in screw-and-nut gearing |
US2924113A (en) * | 1960-02-09 | Orner | ||
JP2004108538A (ja) * | 2002-09-20 | 2004-04-08 | Nsk Ltd | ボールねじ |
JP2004150623A (ja) * | 2002-09-06 | 2004-05-27 | Koyo Seiko Co Ltd | ボールねじ装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2450282A (en) * | 1946-07-18 | 1948-09-28 | Gen Motors Corp | Antifriction screw and nut actuator |
US2486055A (en) * | 1948-01-29 | 1949-10-25 | Gen Motors Corp | Antifriction screw and nut actuator |
DE2941565C2 (de) * | 1979-10-13 | 1982-03-18 | Helmut 5600 Wuppertal Korthaus | Kugelgewindetrieb |
US5358265A (en) * | 1990-08-13 | 1994-10-25 | Yaple Winfred E | Motorcycle lift stand and actuator |
JP4786835B2 (ja) * | 2001-09-05 | 2011-10-05 | 株式会社ジェイテクト | ボールねじ装置 |
EP1426660B1 (en) * | 2001-09-12 | 2010-03-03 | JTEKT Corporation | Ball screw device |
US7013747B2 (en) * | 2002-04-15 | 2006-03-21 | White Stroke Llc | Internal recirculating ball screw and nut assembly |
-
2004
- 2004-09-24 JP JP2004276387A patent/JP2006090421A/ja not_active Withdrawn
-
2005
- 2005-09-22 US US11/663,720 patent/US20080078264A1/en not_active Abandoned
- 2005-09-22 WO PCT/JP2005/017495 patent/WO2006033397A1/ja active Application Filing
- 2005-09-22 EP EP05785608A patent/EP1811204A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2924113A (en) * | 1960-02-09 | Orner | ||
GB526735A (en) * | 1939-03-15 | 1940-09-24 | Giuseppe Gianetti | Improvements in screw-and-nut gearing |
JP2004150623A (ja) * | 2002-09-06 | 2004-05-27 | Koyo Seiko Co Ltd | ボールねじ装置 |
JP2004108538A (ja) * | 2002-09-20 | 2004-04-08 | Nsk Ltd | ボールねじ |
Also Published As
Publication number | Publication date |
---|---|
EP1811204A1 (en) | 2007-07-25 |
US20080078264A1 (en) | 2008-04-03 |
JP2006090421A (ja) | 2006-04-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5252279B2 (ja) | ボールねじ機構 | |
JP2008281063A (ja) | ボールねじ機構 | |
JP4371430B2 (ja) | 循環路を備えたボールねじ装置と、その製造方法 | |
JP2007092968A (ja) | ナットの製造方法 | |
JP6264049B2 (ja) | デフレクタ、ボールねじ装置、ボールねじ装置の製造方法、及びステアリング装置 | |
WO2006033397A1 (ja) | ボールねじ機構 | |
JP4483257B2 (ja) | ボールねじとそのナットのつなぎ目の加工方法及び電気式動力舵取装置 | |
US9266555B2 (en) | Electric power steering apparatus of ball screw type | |
US9446788B2 (en) | Ball screw mechanism and steering device | |
TW201100672A (en) | Ball-screw spline | |
JP2007255435A (ja) | 転動体ねじ装置及び転動体ねじ装置の製造方法 | |
JP4640135B2 (ja) | ボールねじおよびボールねじ用ナット製造方法 | |
JP2004058980A (ja) | 車両用電動式パワーステアリング装置 | |
JP2012112432A (ja) | リターンチューブ及びその製造方法、並びにボールねじ | |
JP2008157374A (ja) | ボールねじ機構 | |
JP2006275139A (ja) | ボールねじ機構 | |
JP4978887B2 (ja) | ボールねじ機構 | |
JP2007024229A (ja) | ボールねじ装置とその製造方法および該ボールねじ装置を用いた電動式動力舵取装置 | |
JP2007024174A (ja) | ボールねじ機構 | |
JP5282810B2 (ja) | ボールねじ機構 | |
KR20070092019A (ko) | 비순환형 볼너트를 구비한 전동식 조향장치 | |
JP2008064250A (ja) | デフレクタ式ボールねじ装置 | |
JP7183711B2 (ja) | ボールねじ装置及び電動パワーステアリング装置 | |
JP2012077914A (ja) | ボールねじ機構 | |
TWI675974B (zh) | 滾珠螺桿裝置及電動助力轉向裝置 |
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 KE KG KM 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): 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 |
|
DPE1 | Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101) | ||
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: 2005785608 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11663720 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: 2005785608 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11663720 Country of ref document: US |