WO2008128511A2 - Mécanisme de bande d'écartement comprenant un système de guidage par rouleaux - Google Patents

Mécanisme de bande d'écartement comprenant un système de guidage par rouleaux Download PDF

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Publication number
WO2008128511A2
WO2008128511A2 PCT/DE2008/000630 DE2008000630W WO2008128511A2 WO 2008128511 A2 WO2008128511 A2 WO 2008128511A2 DE 2008000630 W DE2008000630 W DE 2008000630W WO 2008128511 A2 WO2008128511 A2 WO 2008128511A2
Authority
WO
WIPO (PCT)
Prior art keywords
belt
spreizbandmechanik
forming rollers
profile
spreader
Prior art date
Application number
PCT/DE2008/000630
Other languages
German (de)
English (en)
Other versions
WO2008128511A3 (fr
Inventor
Andreas Dätig
Original Assignee
Schaeffler Kg
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 Schaeffler Kg filed Critical Schaeffler Kg
Publication of WO2008128511A2 publication Critical patent/WO2008128511A2/fr
Publication of WO2008128511A3 publication Critical patent/WO2008128511A3/fr

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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
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/06—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising flexible members, e.g. an endless flexible member
    • F16H19/064—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising flexible members, e.g. an endless flexible member the flexible push member uses a bended profile to generate stiffness, e.g. spreading belts

Definitions

  • the invention relates to a Sp Schwarzbandmechanik with improved guidance of the spreader.
  • Spreader belt mechanisms are used as a machine element in drive technology.
  • a Sp Dr Drettichanik allows a transmission of tensile and compressive forces and bending moments to a limited extent by profiled metal bands.
  • the stiffness property of a metal band curved transversely to the direction of winding is utilized, so that, in contrast to the known traction mechanism transmissions with metal bands, both tensile and compressive forces can be transmitted in the longitudinal direction of the band.
  • the property of width variation of a curved band is used, which assumes its entire width in the wound state, while it is narrower in the developed and then curved in cross-section state. This change in width is used to tape between the side windows (shelves) to clamp the drive roller, whereby a force and possibly positive connection is made.
  • a Sp Drettifmodul In its basic structure, a Sp Drettifmodul consists of a role and a band and has a rotationally mounted, driven roller over two degrees of freedom in one plane. Forces can be transmitted via this basic structure only in the longitudinal direction of the strip, moments exclusively perpendicular to the longitudinal direction of the strip and to the axial direction of the roll.
  • Sp Dreckbandmodule that unite as a joint-member combination drive and guide member to parallel kinematics very compact robot can be built. These are characterized by a very good ratio of working space to space and a comparatively simple mechanical structure.
  • a disadvantage of spreading band mechanisms is the high stress which the metal band is subjected to during the transition from the wound to the unwound stretched state. This is given in particular by the necessary clamping of the expansion band between the two side windows of the drive roller.
  • Sp Dr are known in which the side windows of the drive roller in the circumferential direction have a profiling and are selectively biased.
  • the loads of the spreader are to be reduced and the power transmission can be made more efficient and accurate.
  • the loads of the spreader are very high.
  • the wear behavior of such a solution is not yet known.
  • Another disadvantage of this solution is that a very accurate production of the side surfaces of the spreader is required to allow for improved power transmission. Increased positioning accuracy can only be achieved through complex control technology.
  • the object of the present invention is thus to provide an improved spreading band mechanism in which the stress of the spreading band is significantly reduced and at the same time a more efficient and accurate power transmission is made possible.
  • the improved expansion band mechanism should be distinguished by high reliability, a long service life and a reduced production cost.
  • the expansion band mechanism according to the invention initially comprises a spreading band, which can be reversibly converted from a stretched state into a winding state.
  • the spreader In the extended state, the spreader has a profile in cross section.
  • the spreader is suitable for receiving bending moments.
  • this part of the spreading belt has been transferred to the winding state, this part of the spreading belt has essentially lost its profile.
  • This part of the spreading band is therefore flat in cross section. This transfer can be carried out continuously, so that the spreading belt can be continuously transferred to the winding state with respect to its longitudinal direction.
  • the expanding band mechanism further comprises at least one pair of forming rollers, between which the spreader is guided longitudinally.
  • the forming rollers serve to guide the expansion belt when it is in the stretched state.
  • the two forming rollers each have a tread that is at least partially in the extended position with the profile of the spreader in positive engagement.
  • This positive connection can be achieved in that the roller tread has at least partially the complementary shape as the profile side of the expansion band to be led.
  • this has a take-up roll for rolling up and unrolling the expansion band.
  • the portion of the spreader which is located between the take-up roll and the two forming rollers undergoes a bending moment, by which the spreader is transferred at this position from the extended state to the winding state. As a result, it loses its profile and is flat in cross section.
  • the flat expansion band is now elastic enough to be rolled up on the take-up roll. This transfer takes place in the reverse direction, when the spreader is unrolled from the take-up roll.
  • the winding roller has the advantage that large lengths of the spreader can be kept in a small space.
  • At least one of the two shaping rollers is driven. Since the spreader belt is guided by the forming rollers, forces can be transmitted to the spreader belt from the forming rollers. These can be both driving forces and braking forces.
  • This embodiment has the advantage that the drive of the spreader belt over the two forming rollers allows much higher power transmission, as is possible for example by a driven take-up reel.
  • the drive of the spreading belt via the two forming rollers allows a significantly higher positioning accuracy, since the drive does not take place over a Sp Drostbandab mustard in flat winding condition.
  • the drive does not have to be on each be adapted to the current winding radius.
  • the forming rollers are preferably arranged so that a plane spanned by the axes of the two rollers lies perpendicular to a plane in which the spreading belt is located between the forming rollers.
  • the distance between the axes of the two forming rollers corresponds to the sum of the radii of the two rollers plus the thickness of the expansion band.
  • This embodiment has the advantage that a maximum power transmission is possible.
  • the form rollers are urged toward one another in this arrangement by one or more springs, whereby the force-fit of the connection between the form rollers and spreader is significantly increased and high forces between these ü can be transferred.
  • the forming rollers may be urged toward one another by actuators or the like.
  • a plurality of pairs of forming rollers are used, which are arranged one behind the other in the running direction of the spreading belt.
  • the transfer of the spreader ribbon from the wound to the stretched state can in this case take place in several steps if the cross-sectional shapes of the pairs of forming rolls differ. This means, for example, that a first pair of forming rollers positioned near the take-up roll has fewer curved running surfaces and a more distant second pair of forming rollers has more curved running surfaces.
  • the take-up roll is preferably free-running. Since the form roller pair fulfills the function of the guide and possibly also of the drive, there is no need for a drive on the take-up reel. Consequently, the considerable stress that the expansion band between the side windows of the take-up roll experiences in the case of expanding belt mechanisms according to the prior art is eliminated. Also, the take-up roller can be driven, in particular reversibly driven by a coil spring and, if necessary, be braked to support the Aufrollfunktion.
  • the running surfaces of the two forming rollers are completely in positive engagement with the profile of the expanding belt.
  • the treads in width and shape on a surface which is in each case completely complementary to the leading profile side of the expansion band.
  • the profile of the spreader is preferably formed by a simple curvature of the spreader. This profile shape of a spreader has proven to be the most suitable form for most applications.
  • the spreading band mechanism according to the invention is, however, in principle also suitable for other profiles of the spreader belt. For example, wavy or triangular profiles are usable.
  • the expansion band may also have a profile in longitudinal section, for example in the form of holes or prongs, which may also be in positive engagement with the running surfaces of the forming rollers; for example, by pins in the tread, which engage in the holes in the spreader. In the last-mentioned embodiment, the slip between the forming rollers and the spreading belt reduces substantially to zero.
  • Sp Dr Drettichanik with a curved spreader preferably one of the two forming rollers on a convex curved tread, while the other of the two form rollers has a concave tread.
  • the arched expansion band is completely enclosed in this way in cross section of the forming rollers, whereby a complete positive engagement and a substantial adhesion are ensured.
  • the radii of the curved running surfaces of the forming rollers are preferably the same size as the radius of curvature of the profile of the expansion belt.
  • the radii of the curved running surfaces of the shaping rollers are slightly smaller than the radius of curvature of the profile of the expansion belt.
  • the expansion band is preferably made of an elastic metal or an elastic plastic. Due to the elasticity of the spreader, this can be reversibly transferred from the stretched state to the winding state. Due to internal forces, the expansion band strives to take the profile and thus assume the stretched state. If a bending moment acts on the expansion band, the expansion band can initially withstand the bending moment due to the transverse profile. However, if the bending moment is greater than a transfer bending moment, then the expansion strip abruptly buckles at the point of action of the bending moment and loses its profile there. However, the profileless sections of the spreader belt can be deformed with lower bending moments so that the spreader belt can be wound up. If the bending moment acting on the spreading band becomes smaller than a return bending moment, the expanding band resumes its profile and jumps into the stretched state.
  • the spreading band is wider in the winding state than in the stretched state.
  • Fig. 1 is a perspective view of a preferred embodiment of a spread tape mechanism according to the invention.
  • Fig. 2 is a sectional view of a forming roller pair of Sp Schwarzbandmechanik shown in Fig. 1.
  • Fig. 1 shows a perspective view of a preferred embodiment of a spreadable band mechanism according to the invention.
  • the spreading band mechanism comprises a spreading band 01, which can serve as an actuator for positioning, for example. About the spreading 01 tensile and compressive forces, but also bending moments are transferable to a limited extent.
  • the spreading belt 01 is guided between a first forming roller 02 and a second forming roller 03. At the proximal end of the spreading belt 01, the spreading belt 01 is wound on a take-up reel 04. For example, a tool or a probe could be attached to the distal end of the spreader.
  • the spreading band 01 is shown in two states.
  • the portion of the spreading belt 01 which is wound on the take-up reel 04 is in a winding state.
  • the other portion of the spreader belt 01 shown is in an extended condition.
  • the expansion band 01 is stretched in a straight line substantially rectilinear and has a curved profile 06.
  • the profile 06 has here the shape of a bow.
  • the spreading belt 01 In the winding state, the spreading belt 01 is flat in cross section and wider than in the extended state. It may have a curvature only partially.
  • the spreading belt 01 located in the winding state changes its shape in the longitudinal direction when bending moments occur, so that it can be wound onto the take-up reel 04.
  • the transition from the extended state to the winding state or vice versa takes place continuously during the winding or unwinding in the longitudinal direction of the spreading belt 01.
  • the first forming roller 02 has a running surface 07, which is outwardly, that is convexly curved.
  • the second forming roller 03 has a tread 08, which is curved inwardly, that is concave.
  • the curvatures of the running surfaces 07, 08 are equal in relation to the radius of curvature of the profile 06 of the spreading belt 01.
  • the forming rollers 02, 03 are urged by springs or other force-introducing elements (not shown) on each other, so that the spreading belt 01 is clamped between them. Since this clamping effect is distributed over the entire transverse profile 06, the spreading belt 01 is only insignificantly stressed.
  • the forming rollers 02, 03 are pressed by the springs on the spreading belt 01, whereby a non-positive connection to the expansion belt 01 is given.
  • the two forming rollers 02, 03 are driven by a motor or the like.
  • the drive torque is transmitted as tensile or shear force on the spreading belt 01. This can be done a precise positioning of the spreading 01.
  • the take-up roll 04 is free-running or braked.
  • the drive of the spreading belt 01 is effected either exclusively via the shaping rollers 02, 03 or, in the case of modified embodiments, in addition via the take-up reel.
  • the drive of the spreading belt 01 over the two forming rollers 02, 03 can be done in two directions. In an unwinding direction, the spreading belt 01 is unwound from the take-up reel 04. If the unwinding roller 04 runs freely, the drive of the spreading belt 01 is not thereby braked and the stress of the spreading belt 01 is minimal. If the spreading belt 01 is driven by the forming rollers 02, 03 in the opposite direction, the spreading belt 01 is moved in the direction of the winding roller 04. As a result, an enlarged elongate section of the expansion belt 01 faces the take-up roll 04, as a result of which the bending moment increases to the transition region between the stretched section and the section in the winding state. Due to the increasing bending moment the spreading belt 01 is continuously transferred to the winding state, whereby the bending moment is simultaneously reduced. This transfer is continuous and continuous.
  • the roll on 04 may be caused by an inner coil spring to support the winding of the Spreader 01.
  • FIG. 2 shows a sectional view of a detail of the spreading band mechanism shown in FIG. 1.
  • FIG. The section runs through the axes of the two forming rollers 02, 03.
  • the cutting plane is aligned perpendicular to the Sp Dahlband 01.
  • the spreading belt 01 is shown in the transverse profile.
  • the curved running surfaces 07, 08 are shown in cross section, between which the spreading belt 01 is guided.
  • the curved running surfaces 07, 08 engage in the profile of the expansion belt 01, so that a complete positive fit between the running surfaces 07, 08 of the two rollers 02, 03 and the spreading belt 01 is given.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

La présente invention concerne un mécanisme de bande d'écartement dans lequel le guidage de la bande d'écartement est amélioré. Des mécanismes de bande d'écartement sont utilisés comme élément de machine à des fins d'entraînement. Le mécanisme de bande d'écartement comprend au moins une paire de rouleaux profilés (02, 03) entre lesquels la bande d'écartement est guidée de façon longitudinale. Les rouleaux profilés servent au guidage de la bande d'écartement (01) lorsque celle-ci se trouve à l'étend d'extension. A cet effet, les deux rouleaux profilés présentent respectivement une surface de roulement (07, 08) qui vient en prise par complémentarité de forme au moins partiellement avec la forme profilée de la bande d'écartement dans sa position d'extension. Cette complémentarité de forme peut être obtenue en donnant à la surface de roulement au moins partiellement une forme complémentaire de celle du côté profilé de guidage de la bande d'écartement. Ensuite, les surfaces de roulement et la forme profilée de la bande d'écartement viennent en prise mutuelle et le profilage de la bande de guidage est entretenu par les surfaces de roulement.
PCT/DE2008/000630 2007-04-18 2008-04-16 Mécanisme de bande d'écartement comprenant un système de guidage par rouleaux WO2008128511A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710018163 DE102007018163A1 (de) 2007-04-18 2007-04-18 Spreizbandmechanik mit Rollenführung
DE102007018163.0 2007-04-18

Publications (2)

Publication Number Publication Date
WO2008128511A2 true WO2008128511A2 (fr) 2008-10-30
WO2008128511A3 WO2008128511A3 (fr) 2009-01-15

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Application Number Title Priority Date Filing Date
PCT/DE2008/000630 WO2008128511A2 (fr) 2007-04-18 2008-04-16 Mécanisme de bande d'écartement comprenant un système de guidage par rouleaux

Country Status (2)

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DE (1) DE102007018163A1 (fr)
WO (1) WO2008128511A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010052498A1 (de) 2010-11-26 2012-05-31 Martin Högenauer-Lego Mechanik für ein Spreizband
AT513318B1 (de) 2012-09-14 2015-05-15 Werner & Pfleiderer Lebensmitt Walze zur Führung von Förderbändern
DE102012221202B4 (de) * 2012-11-20 2021-10-28 Schaeffler Technologies AG & Co. KG Vorrichtung zum Führen eines Spreizbandes
DE102020129479B4 (de) 2020-11-09 2023-11-09 Polymath.Vision UG (haftungsbeschränkt) Linearantrieb und Verfahren zur Linearverschiebung eines Objektes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371801A (en) * 1965-10-06 1968-03-05 Widegren Lars Harald Extensible jib, mast or the like
DE1509020A1 (de) * 1962-07-12 1969-03-13 Thiokol Chemical Corp Ein- und ausziehbares Bauteil
GB2202815A (en) * 1987-03-30 1988-10-05 Mantell Technical Services Lim Load pushing apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1509020A1 (de) * 1962-07-12 1969-03-13 Thiokol Chemical Corp Ein- und ausziehbares Bauteil
US3371801A (en) * 1965-10-06 1968-03-05 Widegren Lars Harald Extensible jib, mast or the like
GB2202815A (en) * 1987-03-30 1988-10-05 Mantell Technical Services Lim Load pushing apparatus

Also Published As

Publication number Publication date
DE102007018163A1 (de) 2008-10-23
WO2008128511A3 (fr) 2009-01-15

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