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WO2001090599A1 - Dispositif pour convertir des mouvements rotatifs en mouvements lineaires et inversement - Google Patents

Dispositif pour convertir des mouvements rotatifs en mouvements lineaires et inversement Download PDF

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Publication number
WO2001090599A1
WO2001090599A1 PCT/AT2001/000156 AT0100156W WO0190599A1 WO 2001090599 A1 WO2001090599 A1 WO 2001090599A1 AT 0100156 W AT0100156 W AT 0100156W WO 0190599 A1 WO0190599 A1 WO 0190599A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
rollers
housing
synchronization
handwheel
Prior art date
Application number
PCT/AT2001/000156
Other languages
German (de)
English (en)
Inventor
Wolfgang HÖDL
Original Assignee
Schiebel Antriebstechnik Gesellschaft M.B.H.
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 Schiebel Antriebstechnik Gesellschaft M.B.H. filed Critical Schiebel Antriebstechnik Gesellschaft M.B.H.
Priority to AU2001259933A priority Critical patent/AU2001259933A1/en
Publication of WO2001090599A1 publication Critical patent/WO2001090599A1/fr

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
    • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
    • F16H25/2266—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers arranged substantially in parallel to the screw shaft axis

Definitions

  • the invention relates to a device for converting rotary movements into linear movements, optionally of linear movements into rotary movements, with a threaded spindle and a plurality of rollers provided with ring projections, which are arranged between a threaded housing on the inside and the spindle, the Housing with spindle rotating relative to it by rolling engagement between the rollers and the spindle or the housing is movable relative to the spindle in the axial direction.
  • the invention relates to an actuator with a spindle and with a connection to an actuator, a handwheel being provided for manual adjustment and a motorized drive unit being provided for machine adjustment, wherein for the motorized drive unit e.g. an electric, pneumatic or hydraulic motor can be provided.
  • the motorized drive unit e.g. an electric, pneumatic or hydraulic motor can be provided.
  • spindle drives Devices for converting rotary movements into linear movements are generally known as spindle drives. Most of the time, such spindle drives have a trapezoidal spindle on which a nut secured against rotation is linearly adjusted. Such spindle drives are relatively robust and inexpensive to manufacture, but they are extremely maintenance-intensive and have an inconsistent efficiency.
  • US Pat. No. 3,884,090 A discloses a roller screw drive in which a plurality of cylindrical rollers are freely rotatably mounted in a cage and an improved efficiency is achieved by rolling the flanks of the thread of the spindle or the housing surrounding the rollers in the grooves of the rollers is achieved.
  • roller screws usually require extremely high manufacturing accuracies, which makes them relatively expensive to produce.
  • the field of application of such roller screw drives is also in the area of high Precision settings, such as for adjusting the solar wings of satellites.
  • the aim of the invention is to provide a device of the type mentioned at the outset which has a constant efficiency which is improved compared to trapezoidal spindle drives and which requires little maintenance. Furthermore, the device should have a construction which, due to the possibility of reduced manufacturing accuracy, brings about a cost saving, but on the other hand has a high level of robustness in order to be able to transmit large axial forces.
  • Another object of the invention is to provide an actuator of the type mentioned at the outset, which is also inexpensive to manufacture and can transmit high axial forces and / or high (derived) torques due to its robust design.
  • the device according to the invention of the type mentioned at the outset is characterized in that the rollers have a spherical shape and the inside of the annular housing has a shape which is curved outward toward the rollers in order to reduce the contact pressure in both end regions of the rollers.
  • the contact pressure between the individual gear parts in the two end regions of the rollers in which, depending on the direction of rotation of the spindle there is an absolute maximum, since the rollers are only in full contact with the thread of the spindle or the thread of the housing enclosing the rollers in the central region of the rollers when the axes of the spindle or the rollers are parallel.
  • the requirements for the manufacturing accuracy can be reduced and the device can be designed cost-effectively.
  • the rollers it is also possible for the rollers to have a cylindrical shape and for the housing enclosing the rollers to have a shape which is curved outwards towards the rollers, as a result of which the maximum contact pressure is also shifted from the respective end regions of the rollers to the central region to be able to reduce the requirements for manufacturing accuracy, which in turn saves costs. Furthermore, there is still an efficiency of approx. 80%.
  • the threads In order to be able to transmit high axial forces, it is advantageous if the threads have a flank angle of less than 90 °, for example less than 70 °, preferably of approximately 60 °.
  • the thread on the inside of the housing has at least one roller reset section which extends over the entire axial length of the housing in which the thread is interrupted.
  • this roll reset section the rolls can e.g. after each revolution, related to the spindle, be set back by one thread.
  • flanks of the thread on the inside of the housing have a sloping transition towards the reset section, a smooth transition of the rollers between the reset section and the re-entry into the thread is advantageously achieved.
  • the sloping transition into the reset section can be rounded off, but tangential sloping or moderately discontinuous sloping transitions are also possible in terms of production technology.
  • each roller is therefore e.g. set back by half a pitch of a two-start thread or according to the number of partial reset areas.
  • rollers are rotatably mounted in synchronization disks by means of pins provided at both ends, the rollers can advantageously not move against one another, as a result of which disadvantageous mutual contact between the rollers can be avoided.
  • rollers are assigned end-link link plates which each have at least one roller reset nose, each of which is assigned to a reset partial area.
  • the synchronization disks are coupled to one another via at least one synchronization shaft.
  • the reaction forces that occur do not result in friction losses on the circumference of the synchronization disks, but are advantageously supported by the shaft bearings located opposite each other.
  • synchronization shaft is freely rotatable in the cover or link plates, additional bearing points for the synchronization shaft can advantageously be omitted, which results in cost-effective production.
  • the axes of the rollers are arranged obliquely with respect to the axis of the spindle, there are smaller difference angles between the grooved flanks of the rollers with respect to both the spindle and the nut thread, as a result of which advantageous rolling ratios and lower synchronization support torques are achieved. It is essential here that the desired inclination of the roller axes to the spindle axis remains constant, this being reliably achieved in a simple manner if the two synchronization disks for the inclination of the axes of the rollers are arranged offset with respect to the axis of the spindle.
  • the pins of the rollers In order to avoid an unfavorable point contact between the pins of the rollers and the elongated holes provided for their reception, it is advantageous if the pins have a bulbous shape.
  • the actuator according to the invention of the above Art is characterized in that a conversion device is provided as indicated above between the motor drive unit or handwheel on the one hand and the actuator connection on the other hand.
  • a conversion device is provided as indicated above between the motor drive unit or handwheel on the one hand and the actuator connection on the other hand.
  • a planetary gear with a sun wheel and several planet wheels is provided for adjusting the spindle.
  • the spindle is connected to the sun gear or the handwheel spindle is connected to the planet gears.
  • the spindle is connected to the planet gears or the handwheel spindle is connected to the sun gear in order to obtain a translation from the motor drive unit to fast or a translation of the movement introduced by the handwheel to slow.
  • a worm wheel is provided for transmission of movement from a motor-driven drive shaft to the planetary gear.
  • the connection between the drive shaft and the worm wheel can be self-locking in order to prevent unwanted turning back due to torques acting on the spindle.
  • the motor drive unit can also be assigned a switchable locking element, possibly an electromechanical brake, in order to hold the actuator in the respective position.
  • the cylindrical body can be connected to the housing with flexible elements, preferably two ropes, for transmitting motion from the housing to the cylindrical body.
  • Figure 1 partially a detailed view of a spherical roller between a spindle and a housing of a spindle drive.
  • FIG. 2a schematically shows a diagram of the force profiles between the rollers and the spindle or the housing according to the prior art
  • FIG. 2b shows a diagram according to FIG. 2a with manufacturing inaccuracies
  • 2c schematically shows a diagram of the force profiles between the rollers and the spindle or the housing in the case of a spherical shape of the rollers and / or a shape of the inside of the housing that bulges outwards in the central region of the rollers towards the rollers;
  • FIG. 2d shows a diagram according to FIG. 2c with manufacturing inaccuracies as in FIG. 2b;
  • FIG. 3 shows a plan view of the device according to the invention
  • FIG. 4 shows a view according to FIG. 3, however, with the link plate removed;
  • FIGS. 5 shows a view according to FIGS. 3 and 4 with the upper synchronization disk removed; 6 shows a perspective view of a device modified from FIGS. 1 to 5 with the housing part removed;
  • FIG. 7 shows a view of the device according to FIG. 6 with the housing closed
  • FIG. 8 shows a side view of the device according to FIG. 6;
  • FIGS. 1 to 5 shows a perspective view of a gearbox of an actuator with a device according to FIGS. 1 to 5;
  • FIG. 10 shows a broken view of this transmission according to FIG. 9;
  • FIG. 11 shows an actuator according to FIGS. 9 and 10, wherein a linear rotation movement transmission device free of lateral force is provided;
  • FIG. 12 shows a perspective view according to FIG. 11 from the rear
  • FIG. 13 shows in detail the course of ropes for the transverse force-free motion transmission device according to FIGS. 11 and 12.
  • FIG. 1 shows a half section of a device 1 for converting rotational movements into linear movements, in which a plurality of rollers 4 are provided between a spindle 2 and a housing 3 and are provided for a rolling motion transmission.
  • the spindle 2 and the housing 3 each have a thread 5 or 6, the flanks of these threads 5, 6 engaging in the grooves 7 of the rollers 4 and causing a rolling motion transmission.
  • the roller 4 shown in FIG. 1 has a slightly convex shape in order to achieve the maximum stress of to shift the end regions 8 and 9 into the central partial region 10 of the roller 4, as a result of which lower manufacturing accuracies are required.
  • the crowning can be defined differently, e.g. -Convexities on the order of a few tenths of a degree have proven to be favorable.
  • the maxima 17 ', 18' of the force transmissions 17, 18 between the spindle 2 and the rollers 4 or the rollers 4 and the housing 3 are shifted into the central region 10.
  • the device according to the invention exhibits a significantly less critical behavior towards manufacturing inaccuracies, as can be seen from FIG. 2d.
  • 2d shows manufacturing inaccuracies as in FIG. 2b, but these manufacturing inaccuracies only lead to an increase in the pressure in the edge regions 8, 19, while the pressure maxima 17 ', 18' remain unchanged.
  • the requirements for manufacturing accuracy which in the prior art are in the 0.001 mm range, can be reduced by a power of ten in the 0.01 mm range, and significant cost savings can thus be achieved.
  • flanks of the threads 5 or 6 and the corresponding grooves 7 of the roller 4 have a flank angle of e.g. approx. 60 ° (90 ° flank angles are common in the state of the art).
  • rollers 11 which serve to mount the rollers 4 in synchronization disks 12 (cf. FIG. 4).
  • This mounting of the rollers 4 in the synchronization disks 12 has the primary purpose of preventing the rollers 4 from colliding with one another, which could possibly destroy the device, and of guiding the rollers 4 parallel to the system axis.
  • the two synchronization disks 12 each have link disks
  • a synchronization shaft 14 is provided, which prevents rotation slip between the two synchronization disks 12.
  • the synchronization shaft 14 has two ring gears 15, which bring about an identical speed via a meshing engagement in ring gears 16 of the synchronization disks 12. This prevents the rollers 4 from sloping between the spindle 2 and the housing 3 become.
  • the synchronization shaft 14 is freely rotatably mounted in openings in the link plates 13, which further have control cam-like ratchet lugs 13 'for resetting the rollers.
  • the device 1 is shown in a plan view, wherein the spindle 2 and the rollers 4 rotatably mounted in the synchronization disks 12 can be seen within the housing 3, but partially from the link disk 13 in which the synchronization shaft 14 is mounted , are covered.
  • the synchronization shaft 14 engages with the ring gears 15 in the ring gears 16 of the synchronization disks 12 and thus forces synchronization of the synchronization disks 12, which prevents the rollers 4 from jamming.
  • the pins 11 of the rollers 4 are mounted in radial elongated holes 20, as a result of which the rollers 4 can move in the radial direction, which is particularly evident when the entry and exit in FIG 21 is desired.
  • FIG. 5 also illustrates the rolling engagement of the rollers 4 with the thread 5 of the spindle 2 or with the thread 6 of the housing 3.
  • the rounded transitions 22 of the thread 6 in, the thread-free reset partial regions 21 can also be seen, as a result of which a smooth entry or exit of the rollers 4 in or out of the respective reset portion 21 is made possible. It is expedient here if the thread 6 of the housing is not cylindrical, but is widened in the reset partial areas 21, as a result of which a torque which is as continuous as possible for generating the axial force (or vice versa) is achieved.
  • FIG. 6 shows a somewhat modified device 1 'compared to the device 1 shown in FIGS. 1 and 3 to 5, in which the synchronization disks 12 are coupled to one another via two synchronization shafts 14 arranged offset by 180 °.
  • the housing 3 is composed of two separate housing parts 3 ', one of the two housing parts 3' being removed in the exemplary embodiment shown in FIG. 6. With the aid of the diametrical arrangement of two synchronization shafts 14, the reaction forces that arise do not result in friction losses on the circumference of the synchronization disks 12, but are advantageously supported via the synchronization shaft 14 located opposite each other.
  • FIG. 7 the device 1 'according to FIG. 6 is with both Housing parts 3 'shown.
  • the rollers 4 are not arranged parallel to the axis of the spindle 2, but rather that the axes of the rollers 4 are inclined slightly relative to the main system axis defined by the axis of the spindle 2 is (see also Fig. 8). This can be achieved, for example, by rotating the two synchronization disks 12 with respect to one another before the rollers 4 are installed.
  • the pins 11 of the rollers 4 have a bulbous shape, as a result of which it does not occur even when the axes of the rollers 4 are inclined relative to the axis of the spindle 2 there is an adverse point contact between the pins 11 and the elongated holes 20 receiving the pins 11.
  • rounded shapes of the pins 4 e.g. a double cone shape or the like, conceivable.
  • FIG. 9 shows a perspective view of an actuator 23 (without a motor drive unit and without a handwheel) with a device 1 for converting rotational movements of the spindle 2 into a linear movement of the housing 3, which is connected to an actuator (not shown).
  • the spindle 2 is connected to a sun gear 24 of a planetary gear 25, whereby a rotational movement translation of planet gears 26 of the planetary gear 25 is effected.
  • the planet gears 26 are either driven by a worm drive, which can be self-locking (not shown), for example by an electric motor (possibly not equipped) with a braking device (not shown), or moved by a handwheel spindle 27.
  • a load torque lock 28 is provided between the handwheel spindle 27 and the spindle 2, which enables the torque to be transmitted from the handwheel spindle 27 to the spindle 2 in both directions of rotation, but from the spindle 2 to the handwheel spindle 27 acting torques blocked.
  • FIG. 10 shows a partially broken perspective view of the actuator according to FIG. 9.
  • the movement conversion from the planet gear carrier 29 to the sun gear 24 via the planet gears 26 can be seen.
  • the positive connection of the link plate 13 to the housing 3 of the device 1 can be seen.
  • FIG. 11 An actuator 23 is shown in FIG. 11, in which the linear movement of the housing 3 of the device 1 is in turn converted into a pivoting movement for the actuator.
  • the spindle 2 is connected to the planet gear carrier 25 and the handwheel spindle 27 to the sun gear (not shown), which leads to a speed reduction from the handwheel spindle 27 to the spindle 2.
  • This movement conversion between the housing 3 and a cylindrical connecting piece 32 takes place in the embodiment shown without lateral force, for which purpose a rail 30 is provided on the housing 3, which is provided with four grooves 31 for guiding two cables 33.
  • the cylindrical connection piece 32 is connected to the housing 3 via the two cables 33 looped around the connection piece 32, as a result of which a rolling movement occurs between the connection piece 32 and the rail 30 when the housing 3 is displaced linearly.
  • the ropes 33 are connected in detail to the rail 30 via an adjustable latching device 34, as can be seen in particular from FIG. 12. The tension of the ropes 33 can be adjusted by adjusting a screw 35.
  • FIG. 13 shows the course of the ropes 33 around the cylindrical connecting piece 32, not shown in FIG. 13, in detail. It is important here that the crossed wrapping of the two ropes 33 around the connecting piece 32 enables the rope forces, which may possibly occur due to uneven setting of the ropes, to be balanced, and thus the introduction of tilting moments into the device 1 can be avoided.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un dispositif (1) permettant de convertir des mouvements rotatifs en mouvements linéaires, éventuellement des mouvements linéaires en mouvements rotatifs. Ce dispositif comprend une broche (2) munie d'un filetage (5) et plusieurs rouleaux (4) munis de parties saillantes annulaires, qui sont disposés entre un boîtier (3) présentant un filetage (6) sur sa face intérieure et la broche (2). Le boîtier (3) peut être déplacé par engrènement par roulement entre les rouleaux (4) et la broche (2) ou le boîtier (3), par rapport à la broche (2) dans son sens axial, lorsque la broche (2) tourne par rapport à lui. Les rouleaux (4) présentent une forme convexe ou la face intérieure du boîtier (3) en arc de cercle présente une forme bombée vers l'extérieur en direction des rouleaux (4), afin de réduire la pression de compression exercée dans chacune des deux zones terminales (8,9) des rouleaux (4). L'invention concerne en outre un mécanisme de commande (23) comportant une broche et un raccord avec un élément d'ajustement. Il est prévu pour assurer l'ajustement manuel, un volant et pour assurer l'ajustement mécanique, une unité d'entraînement motorisée. Ledit mécanisme de commande comprend un dispositif selon une des revendications 1 à 12, entre l'unité d'entraînement motorisée ou le volant d'une part et le raccord d'élément d'ajustement d'autre part.
PCT/AT2001/000156 2000-05-19 2001-05-18 Dispositif pour convertir des mouvements rotatifs en mouvements lineaires et inversement WO2001090599A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001259933A AU2001259933A1 (en) 2000-05-19 2001-05-18 Device for converting rotational movements into linear movements or vice versa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT8772000 2000-05-19
ATA877/2000 2000-05-19

Publications (1)

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WO2001090599A1 true WO2001090599A1 (fr) 2001-11-29

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WO (1) WO2001090599A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1596101A3 (fr) * 2004-05-10 2006-09-20 Hitachi, Ltd. Mécanisme pour convertir un mouvement rotatif en mouvement linéaire.
CN1869478B (zh) * 2005-05-24 2010-05-05 株式会社日立制作所 旋转直线运动变换机构
US8011264B2 (en) 2004-05-10 2011-09-06 Hitachi, Ltd. Mechanism for converting rotary motion into linear motion
WO2014207239A1 (fr) * 2013-06-27 2014-12-31 Airbus Defence And Space Limited Ensemble rotatif
US11499609B2 (en) 2018-04-30 2022-11-15 Nexen Group, Inc. Rotary to linear torque transmission device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884090A (en) 1972-04-25 1975-05-20 Skf Ind Trading & Dev Roller screw mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884090A (en) 1972-04-25 1975-05-20 Skf Ind Trading & Dev Roller screw mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1596101A3 (fr) * 2004-05-10 2006-09-20 Hitachi, Ltd. Mécanisme pour convertir un mouvement rotatif en mouvement linéaire.
US8011264B2 (en) 2004-05-10 2011-09-06 Hitachi, Ltd. Mechanism for converting rotary motion into linear motion
CN1869478B (zh) * 2005-05-24 2010-05-05 株式会社日立制作所 旋转直线运动变换机构
WO2014207239A1 (fr) * 2013-06-27 2014-12-31 Airbus Defence And Space Limited Ensemble rotatif
EP2818419A1 (fr) * 2013-06-27 2014-12-31 Astrium Limited Ensemble rotatif
US10040580B2 (en) 2013-06-27 2018-08-07 Airbus Defence And Space Limited Rotatable assembly
US11499609B2 (en) 2018-04-30 2022-11-15 Nexen Group, Inc. Rotary to linear torque transmission device

Also Published As

Publication number Publication date
AU2001259933A1 (en) 2001-12-03

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