WO2006034711A1 - A linear actuator - Google Patents

A linear actuator Download PDF

Info

Publication number
WO2006034711A1
WO2006034711A1 PCT/DK2005/000614 DK2005000614W WO2006034711A1 WO 2006034711 A1 WO2006034711 A1 WO 2006034711A1 DK 2005000614 W DK2005000614 W DK 2005000614W WO 2006034711 A1 WO2006034711 A1 WO 2006034711A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
threads
spindle
safety
safety nut
Prior art date
Application number
PCT/DK2005/000614
Other languages
French (fr)
Inventor
Anders Lykkegaard
Original Assignee
Linak A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linak A/S filed Critical Linak A/S
Priority to ES05786713T priority Critical patent/ES2399828T3/en
Priority to AU2005289197A priority patent/AU2005289197B2/en
Priority to EP05786713A priority patent/EP1800025B1/en
Priority to US11/663,265 priority patent/US7685898B2/en
Priority to DK05786713.7T priority patent/DK1800025T3/en
Priority to JP2007532776A priority patent/JP4975625B2/en
Publication of WO2006034711A1 publication Critical patent/WO2006034711A1/en

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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F16H25/2472—Safety 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
    • Y10T74/186—Alternate power path operable on failure of primary
    • 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
    • Y10T74/18704—Means to selectively lock or retard screw or nut
    • 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
    • Y10T74/19707—Plural longitudinally variably spaced nuts

Definitions

  • the present invention relates to a linear actuator of the type defined in the introductory portion of claim 1.
  • EP 0 586 326 B1 and EP 1 134 454 B1 both to Linak AVS 1 disclose linear actuators of the type mentioned initially, which are provided with a safety nut which is connected with the main nut and follows it as a slave as long as the main nut is intact. In the event that the main nut fails, the connection is interrupted, whereby the safety nut takes over the load. Both structures are configured such that the safety nut can only move the load in the direc ⁇ tion of loading. In case of e.g. a pressure load, the actuator is not capable of lifting the load, but exclusively to lower it.
  • the object of the invention is to provide an improved effect of the safety nut.
  • the safety nut may be caused to follow the main nut in different ways.
  • the safety nut is placed in a well at the end of the main nut, an axially extending fin being provided in the well.
  • the safety nut is provided with a corresponding groove to receive the fin.
  • Fig. 1 shows a longitudinal section through an actuator
  • fig. 2 shows an enlarged longitudinal section through the area at the main nut
  • fig. 3 shows a schematic view of the forces at the contact of the safety nut with the threads of the spindle
  • fig. 4 shows the main nut seen from the side
  • fig. 5 shows a longitudinal section through the main nut, shown with a portion of the spindle and with a safety nut at each end,
  • fig. 6 shows a cross-section through the main nut
  • fig. 7 shows the safety nut seem from the side
  • fig. 8 shows the safety nut seen from one end
  • fig. 9 shows a longitudinal section through the safety nut
  • fig. 10 shows an enlarged section at the side of the safety nut.
  • the actuator comprises a reversible electric motor
  • a tubular thrust rod 6, guided in an outer pipe 5, is secured to the main nut 4, said thrust rod being extended from or retracted into the outer pipe 5 by the movement of the nut.
  • the actuator concerned is intended to accommodate pressure loads.
  • a safety nut 7 is provided in a well 10 at the end of the main nut 4, said safety nut being secured against rotation relative to the main nut in such a manner that it follows the main nut as a slave, as long as the threads of the main nut are intact and are out of engagement with the threads of the spindle.
  • the safety nut 7 is secured in that it is provided with a non-through groove 11 which is arranged inwardly over a fin 12 in the well 10. When the groove 11 is not through-going, easy and correct mounting of the safety nut is en- sured.
  • the spindle 3 is provided with external trapezoidal threads, and the main nut 4 has internal threads corresponding thereto.
  • the safety nut 7 has specially configured internal threads.
  • a first flank 8 of the threads corresponds to the threads of the spindle.
  • a second flank 9 of the threads forms an acute angle v with the longitudinal axis of the nut, that is the flank is steep.
  • the load on the thrust rod 6 will cause the spindle nut and thereby the safety nut 7 to sag, i.e. slide slightly back so that the steep flank 9 of the safety nut gets into contact with the outer edge of the spindle threads flank facing away from the actuator.
  • the safety nut hereby takes over the load.
  • an actuator has been described in the foregoing, where a tubular thrust rod guided in a guide profile is secured to the spindle nut. It will be appreciated that, alternatively, the actuator may be constructed without an thrust rod, but where the nut is secured directly to the structure in which the actuator is incorporated, as is known e.g. from DK 174 457 B1 to Linak A/S.

Abstract

A linear actuator of the type whose function is based on a spindle (3) and a main nut (4), is provided with a safety nut (7) in connection with the main nut. The flank (9) of the safety nut closest to the load is made steep, i.e. forms an acute angle with its longitudinal axis, thereby providing a great frictional force by engagement with the threads of the spindle in the event that the main nut fails. The great frictional force is brought about in that the threads of the spindle, exclusively with the outer edge, get into linear engagement with the steep flank on the safety nut.

Description

A linear actuator
The present invention relates to a linear actuator of the type defined in the introductory portion of claim 1.
EP 0 586 326 B1 and EP 1 134 454 B1 , both to Linak AVS1 disclose linear actuators of the type mentioned initially, which are provided with a safety nut which is connected with the main nut and follows it as a slave as long as the main nut is intact. In the event that the main nut fails, the connection is interrupted, whereby the safety nut takes over the load. Both structures are configured such that the safety nut can only move the load in the direc¬ tion of loading. In case of e.g. a pressure load, the actuator is not capable of lifting the load, but exclusively to lower it.
The object of the invention is to provide an improved effect of the safety nut.
This object is achieved according to the invention by constructing the ac¬ tuator as stated in the characterizing portion of claim 1. When the second flank of the safety nut is made steep, i.e. forms an acute angle with its lon¬ gitudinal axis, a great frictional force is provided by engagement with the threads of the spindle in the event that the main nut fails. The great fric¬ tional force results from the fact that the threads of the spindle, exclusively with the outer edge, get into point-shaped engagement with the steep flank of the safety nut. The point-shaped engagement is rather a linear engage¬ ment seen over the entire threads of the safety nut.
In the event that the spindle is of steel and the safety nut is likewise of steel, it is expedient to harden the safety nut to avoid the situation that the spindle destroys the nut by abrasion. The safety nut may be caused to follow the main nut in different ways. In an embodiment, the safety nut is placed in a well at the end of the main nut, an axially extending fin being provided in the well. The safety nut is provided with a corresponding groove to receive the fin. When the groove is not through-going, but only extends over a portion of the height of the safety nut, correct mounting of the safety nut is ensured in a simple manner.
Additional features of the invention will appear from the following embodi¬ ment of the invention, which will be described more fully below with refer- ence to the accompanying drawing, in which:
Fig. 1 shows a longitudinal section through an actuator,
fig. 2 shows an enlarged longitudinal section through the area at the main nut,
fig. 3 shows a schematic view of the forces at the contact of the safety nut with the threads of the spindle,
fig. 4 shows the main nut seen from the side,
fig. 5 shows a longitudinal section through the main nut, shown with a portion of the spindle and with a safety nut at each end,
fig. 6 shows a cross-section through the main nut,
fig. 7 shows the safety nut seem from the side,
fig. 8 shows the safety nut seen from one end,
fig. 9 shows a longitudinal section through the safety nut, and fig. 10 shows an enlarged section at the side of the safety nut.
As will appear from fig. 1 , the actuator comprises a reversible electric motor
1 which, via a transmission 2, drives a spindle 3 on which a main nut 4 se- cured against rotation is provided, so that the nut is moved out or in on the spindle depending on the direction of rotation of the spindle. A tubular thrust rod 6, guided in an outer pipe 5, is secured to the main nut 4, said thrust rod being extended from or retracted into the outer pipe 5 by the movement of the nut. The actuator concerned is intended to accommodate pressure loads.
It appears from the detailed view in fig. 2 that a safety nut 7 is provided in a well 10 at the end of the main nut 4, said safety nut being secured against rotation relative to the main nut in such a manner that it follows the main nut as a slave, as long as the threads of the main nut are intact and are out of engagement with the threads of the spindle. With reference to figs. 5-8, the safety nut 7 is secured in that it is provided with a non-through groove 11 which is arranged inwardly over a fin 12 in the well 10. When the groove 11 is not through-going, easy and correct mounting of the safety nut is en- sured.
As will appear, the spindle 3 is provided with external trapezoidal threads, and the main nut 4 has internal threads corresponding thereto.
The safety nut 7 has specially configured internal threads. A first flank 8 of the threads corresponds to the threads of the spindle. A second flank 9 of the threads, on the other hand, forms an acute angle v with the longitudinal axis of the nut, that is the flank is steep.
If the threads of the main nut fail, e.g. because of abnormal wear or mate¬ rial defect, the load on the thrust rod 6 will cause the spindle nut and thereby the safety nut 7 to sag, i.e. slide slightly back so that the steep flank 9 of the safety nut gets into contact with the outer edge of the spindle threads flank facing away from the actuator. The safety nut hereby takes over the load.
As will appear from the schematic drawing in fig. 3, a great power compo¬ nent occurs in the contact with the steep flank, resulting in a great frictional force. This ensures the safe state that the actuator can hold the load, but not lift it. The user will see that the thrust rod stands still because the connection of the safety nut with the main nut has been interrupted and the safety nut participates in the rotation of the spindle. If the load is lowered, i.e. the thrust rod is retracted, then the spindle will run free of the steep flank of the safety nut, and the load is now carried on the first flank of the safety nut in engagement with the threads of the spindle.
Provisional tests have shown that an angle v of 20° - 30° gives the desired frictional force.
It will be appreciated that the invention also applies to actuators which are under tension, the safety nut then just has to be moved to the other side of the main nut. It is evident that a respective safety nut 7a, 7b may be ar¬ ranged, if the actuator is under pressure as well as tension, cf. the em¬ bodiment shown in figs. 4-6.
An actuator has been described in the foregoing, where a tubular thrust rod guided in a guide profile is secured to the spindle nut. It will be appreciated that, alternatively, the actuator may be constructed without an thrust rod, but where the nut is secured directly to the structure in which the actuator is incorporated, as is known e.g. from DK 174 457 B1 to Linak A/S.

Claims

PATENT CLAIMS
1. A linear actuator comprising a spindle (3) provided with external threads, a main nut (4) provided with internal threads and in engagement with the threads of the spindle, a safety nut (7) arranged in connection with the main nut (4) and provided with internal threads adapted such that, in case of an intact main nut, it is not in carrying contact with the threads of the spindle, said threads of the safety nut having a first flank (8) intended to engage the threads of the spindle in the event that the carrying capacity of the main nut fails, characterized in that the second flank (9) of the safety nut (7) is steep, i.e. forms an acute angle with the longitudinal axis of the nut.
2. An actuator according to claim ^characterized in that the acute angle v is of the order of 30°.
3. An actuator according to claim 1, characterized in that the safety nut (7) is of metal with hardened threads.
4. An actuator according to claim ^characterized in that the safety nut (7) is mounted in a well (10) at the end of the main nut (4), that an axi- ally extending fin (12) is provided in the well, and that a groove (11) is pro¬ vided in the safety nut (7) to receive the fin (12), said groove (11) extending from one end of the safety nut only over a portion of the height of it.
5. An actuator according to claim ^characterized in that a safety nut (7a, 7b) is provided at each end of the main nut (4).
PCT/DK2005/000614 2004-09-29 2005-09-28 A linear actuator WO2006034711A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES05786713T ES2399828T3 (en) 2004-09-29 2005-09-28 Linear actuator
AU2005289197A AU2005289197B2 (en) 2004-09-29 2005-09-28 A linear actuator
EP05786713A EP1800025B1 (en) 2004-09-29 2005-09-28 A linear actuator
US11/663,265 US7685898B2 (en) 2004-09-29 2005-09-28 Linear actuator
DK05786713.7T DK1800025T3 (en) 2004-09-29 2005-09-28 Linear actuator
JP2007532776A JP4975625B2 (en) 2004-09-29 2005-09-28 Linear actuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200401487 2004-09-29
DKPA200401487 2004-09-29

Publications (1)

Publication Number Publication Date
WO2006034711A1 true WO2006034711A1 (en) 2006-04-06

Family

ID=36118601

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2005/000614 WO2006034711A1 (en) 2004-09-29 2005-09-28 A linear actuator

Country Status (8)

Country Link
US (1) US7685898B2 (en)
EP (1) EP1800025B1 (en)
JP (1) JP4975625B2 (en)
CN (1) CN100535478C (en)
AU (1) AU2005289197B2 (en)
DK (1) DK1800025T3 (en)
ES (1) ES2399828T3 (en)
WO (1) WO2006034711A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107793A1 (en) * 2007-03-05 2008-09-12 Mecvel S.R.L. Improved linear actuator
WO2010092120A1 (en) 2009-02-11 2010-08-19 Brose Fahrzeugteile Gmbh & Co. Kg, Coburg Spindle drive for longitudinally adjusting a motor vehicle seat
EP2716935A1 (en) * 2012-10-03 2014-04-09 Linak A/S Linear actuator

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090249910A1 (en) * 2008-04-04 2009-10-08 Kerk Motion Products, Inc. Lead screw device
US8677852B2 (en) * 2010-02-23 2014-03-25 GM Global Technology Operations LLC Multiplexed electromechanical actuator mechanism
TW201307705A (en) * 2011-08-04 2013-02-16 Jian Xue Qin Ball screw with spare thread track
DE102011084489A1 (en) * 2011-10-14 2013-04-18 Robert Bosch Gmbh Device for operating a plunger
US10493867B2 (en) * 2015-03-24 2019-12-03 Adient Luxembourg Holding S.à.r.l. Adjusting device for a vehicle seat and vehicle seat
US11268607B1 (en) * 2016-02-17 2022-03-08 Helix Linear Technologies Lead screw nuts having threads formed from different materials
USD1016599S1 (en) 2017-02-17 2024-03-05 Helix Linear Technologies Nut
CN107285247B (en) * 2017-08-23 2019-08-27 上海联影医疗科技有限公司 Lifting device and C arm machine
DE102018202926A1 (en) * 2018-02-27 2019-08-29 Aktiebolaget Skf Actuator with a threaded spindle and plastic element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0586326A1 (en) * 1992-09-01 1994-03-09 Linak A/S Linear actuator
EP1134454A2 (en) * 1994-12-23 2001-09-19 Linak A/S A nut assembly for a linear actuator
EP1460311A1 (en) * 2003-03-19 2004-09-22 Ab Skf Safety nut and support of a safety nut for a linear actuator

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Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0586326A1 (en) * 1992-09-01 1994-03-09 Linak A/S Linear actuator
EP1134454A2 (en) * 1994-12-23 2001-09-19 Linak A/S A nut assembly for a linear actuator
EP1460311A1 (en) * 2003-03-19 2004-09-22 Ab Skf Safety nut and support of a safety nut for a linear actuator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1800025A4 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107793A1 (en) * 2007-03-05 2008-09-12 Mecvel S.R.L. Improved linear actuator
WO2010092120A1 (en) 2009-02-11 2010-08-19 Brose Fahrzeugteile Gmbh & Co. Kg, Coburg Spindle drive for longitudinally adjusting a motor vehicle seat
US9139110B2 (en) 2009-02-11 2015-09-22 Brose Fahrzeugteile Gmbh & Co. Kg, Coburg Spindle drive for longitudinally adjusting a motor vehicle seat
US9371012B2 (en) 2009-02-11 2016-06-21 Brose Fahrzeugteile Gmbh & Co. Kg, Coburg Spindle drive for longitudinally adjusting a motor vehicle seat
EP2716935A1 (en) * 2012-10-03 2014-04-09 Linak A/S Linear actuator

Also Published As

Publication number Publication date
US7685898B2 (en) 2010-03-30
EP1800025B1 (en) 2013-01-16
ES2399828T3 (en) 2013-04-03
CN100535478C (en) 2009-09-02
DK1800025T3 (en) 2013-03-25
AU2005289197A1 (en) 2006-04-06
US20090120219A1 (en) 2009-05-14
EP1800025A4 (en) 2010-12-22
JP4975625B2 (en) 2012-07-11
EP1800025A1 (en) 2007-06-27
JP2008514871A (en) 2008-05-08
AU2005289197B2 (en) 2011-02-03
CN101031740A (en) 2007-09-05

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