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WO2008135031A2 - Mécanisme à bande expansible guidé par rouleaux - Google Patents

Mécanisme à bande expansible guidé par rouleaux Download PDF

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Publication number
WO2008135031A2
WO2008135031A2 PCT/DE2008/000754 DE2008000754W WO2008135031A2 WO 2008135031 A2 WO2008135031 A2 WO 2008135031A2 DE 2008000754 W DE2008000754 W DE 2008000754W WO 2008135031 A2 WO2008135031 A2 WO 2008135031A2
Authority
WO
WIPO (PCT)
Prior art keywords
roller
belt
band
spreader
roll
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/DE2008/000754
Other languages
German (de)
English (en)
Other versions
WO2008135031A3 (fr
Inventor
Andreas Dätig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHO Holding GmbH and Co KG
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 WO2008135031A2 publication Critical patent/WO2008135031A2/fr
Publication of WO2008135031A3 publication Critical patent/WO2008135031A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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 Dretzbandmechanik allows a transmission of tensile and compressive forces and bending moments to a limited extent by profiled metal bands.
  • the stiffness property of a curved transversely to the winding direction metal strip is exploited, so that thus both tensile and compressive forces can be transmitted in the longitudinal direction of the belt, in contrast to the known Buchstoffgetrieben with metal bands.
  • 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 clamp the band between the side windows (ribs) of the drive roller, whereby a positive 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 belt, moments exclusively perpendicular to the longitudinal direction of the belt and to the axial direction of the roller.
  • 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 building space as well as 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 in particular given by the necessary clamping of the spreader between the two side windows of the drive roller.
  • the object of the present invention is therefore to provide an improved spreading band mechanism in which the stress of the spreading band is significantly reduced, in particular during the transition from the wound-up to the unwrapped stretched state, and Timing a more efficient and accurate power transmission is possible.
  • the improved spread-band mechanism should be distinguished by a high reliability, a long service life and a reduced production and maintenance costs.
  • the expanding band mechanism 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 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.
  • This transfer is reversible, so that the spreader belt can be moved back into the extended state at any time, in which it again has the profile.
  • the spread tape mechanism according to the invention further comprises a first roll (take-up reel) for rolling up and unrolling the spreader belt. That portion of the spreader, which is located between the take-up roller and the stretched portion of the spreader, 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. On the take-up reel large lengths of the spreader can be kept in a small space.
  • the expanding band mechanism has at least one second roller (secondary roller) on which che a rigid, in cross section preferably not profiled secondary belt up and is unwound.
  • the first and second rollers are arranged relative to one another such that the secondary belt can be wound up and unwound together with the spreading belt onto the take-up reel.
  • the secondary roller is rotatably mounted opposite to the take-up roller and is located on the opposite side of the expansion belt in relation to the take-up roller.
  • the secondary tape is wound on the secondary roll while the spreading tape is unwound from the take-up roll.
  • the secondary band is preferably a conventional metal or steel band, but may also consist of a different material of comparable stiffness depending on the application.
  • a secondary band can also be a coated metal strip is used, which may be useful for reasons of corrosion protection.
  • the problematic unwinding operation of the first spreader-carrying roller is indirectly converted into a non-problematic secondary reel-up operation.
  • the take-up roll serves as a tension roller, which allows a clean unwinding and the secondary role as a drive roller.
  • the secondary belt is wound together with the spreader on the take-up reel.
  • the secondary roller acts as a drive roller and carrier of the secondary belt, while the take-up roller now works as a tension roller.
  • the two rollers are thus used once for the different directions of movement as a drive and once as a tensioning roller.
  • the spreader mechanism realized in this way, the spreader belt is subjected to a significantly lower load and thus also less wear, which is not ultimately reflected in increased reliability and longevity of the spreader belt modules and thus reduced maintenance costs.
  • at least one of the two side windows of the first and the second roller is provided with a toothing.
  • the two gears are engaged with each other here. In this way, the desired bias can be generated as well as a synchronization of the two roles done.
  • the secondary band has approximately the same width as the expansion band in its flat wound state. This ensures that the secondary belt can easily be wound up on the take-up reel together with the spreading belt during the winding-up process.
  • the secondary band could also have a smaller width than the spreader. However, the width should be chosen so that the secondary band covers the largest area of the expansion band during winding.
  • one of the two rollers is driven by a motor to a rotation.
  • the rollers can also be braked or freewheeling operated.
  • the profile of the expansion band is preferably formed by a simple curvature. 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, wave-shaped or triangular-shaped profiles can also be used.
  • the expansion band may also have a profile in longitudinal section, for example in the form of holes or prongs.
  • 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. The spreader is anxious due to internal forces, the Take profile and so to 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. The profileless sections of the spreader can be deformed with lower bending moments, so that the spreader 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. Due to the loss of the profile in the winding state, the spreader is flat and therefore wider. This property can be exploited, for example, for additional guidance on the first, the spread-belt-carrying role.
  • Fig. 1 is a perspective view of a preferred embodiment of a spread tape mechanism according to the invention
  • Fig. 2 is a schematic diagram for illustrating the forces acting during winding forces
  • Fig. 3 is a schematic diagram for illustrating the forces acting during unwinding forces.
  • 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 wound on a first roller 02 (take-up roller).
  • a tool may be attached, which is to be positioned by the spreading belt 01.
  • the spreading band 01 is shown in two states.
  • the portion of the spreading belt 01 which is wound on the take-up reel 02 is in a winding state.
  • the expansion band 01 is in a stretched condition.
  • the expansion band 01 is stretched in a straight line substantially rectilinear and has a curved profile in cross section.
  • 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 rudimentary.
  • 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 winding roller 02.
  • 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.
  • first roller 02 is a second roller 04 (secondary roller), on which a secondary belt 05 up and unwound, in conjunction.
  • the secondary band is designed as a metal band in the embodiment shown. Alternatively, plastic or mixed material bands would also be suitable.
  • the two rollers 02, 04 are arranged to each other so that the spreader
  • the metal band 05 is an ordinary Lich flat, not profiled tape. Preferably, a steel strip is used.
  • the metal strip 05 is usually performed in about the same width as the spreading belt 01 in its flat, wound state. Such a trained metal strip 05 can be particularly easily wound on the first roller 02 together with the spreading belt 01. When unwinding is ensured that the expansion belt 01 is well supported in the transition region from the wound flat state in the curved state of the metal strip 05 and thereby subject to a lower stress.
  • the rollers 02, 04 have an opposite direction of rotation.
  • For synchronization of the rollers 02, 04 is at least one of the two side windows 07 of the rollers 02, 04 provided with a toothing (not shown), which are engaged with each other.
  • a toothing not shown
  • the torque can be transmitted from one to the other role.
  • the desired preload can be generated.
  • the teeth between the rollers could be made to synchronize a frictional engagement or the rollers are driven by direct drives. In the latter case, an adjustment of the rotational speed is possible, which appears to be necessary especially for large winding lengths to avoid looping when wrapping the secondary band from the first to the second role.
  • the power is transmitted via an attachment point 08 of the spreading 01 on the first roller 02 and the radius (Avemwickelradius) of the first roller 02.
  • the second roller 04 serves only as a carrier of the metal strip 05, which together with the spreading belt 01 on the first roller 02 is wound up.
  • the take-up roller 02 serves as a tension roller, which allows a clean unwinding of the spreading 01.
  • Fig. 2 shows a schematic diagram for illustrating the forces acting during winding forces. This basic illustration is based on the expanding band mechanism shown in FIG. 1, wherein for reasons of clarity, the representation of individual features has been dispensed with.
  • a torque Mi acts, so that the spreading belt 01 is moved in a direction 11 (winding).
  • the torque M 1 counteracts a force F L and a bias F V 2 caused by the secondary roller 04 on the spreader belt 01.
  • individual forces FR X acting radially outwards act as a result of the spreader 01 for taking the arched state result.
  • the take-up roll has a radius r 1 .
  • individual forces FR X act radially outward.
  • a torque M 2 acts.
  • the secondary roller 04 has a radius r 2 .
  • Fig. 3 shows a schematic diagram to illustrate the forces acting during unwinding forces. This principle representation is again based on the expansion band mechanism shown in FIG. 1, wherein the illustration of individual features has been dispensed with for the sake of clarity.
  • the winding roller 02 now acts a torque Mi with respect to the illustration in Fig. 3 opposite sense of direction, so that the spreading belt 01 is moved in a direction 12 (unwinding).
  • the Sp Dreckbandrolle take-up reel with wound spreader
  • first summand corresponds to the drive torque caused by the secondary roller 04 and the second summand corresponds to the prestressing moment caused by the take-up roller 02.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Winding Of Webs (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)

Abstract

L'invention concerne un mécanisme à bande expansible doté d'un guidage amélioré de la bande expansible. Les mécanismes à bande expansible sont utilisés comme éléments de machine dans la technique d'entraînement. Le mécanisme à bande expansible selon l'invention comprend un premier rouleau qui permet d'enrouler et de dérouler la bande expansible. Il comprend en outre un deuxième rouleau sur lequel une bande métallique plate peut être enroulée et déroulée, le premier et le deuxième rouleau étant disposés l'un par rapport à l'autre de telle sorte que la bande métallique puisse être enroulée et déroulée avec la bande expansible sur le premier rouleau. Le deuxième rouleau est monté de manière à tourner dans le sens opposé au premier rouleau. Par l'utilisation d'un deuxième rouleau supplémentaire, l'opération de déroulement du premier rouleau portant la bande expansible, qui pose des problèmes de sollicitation, est convertie indirectement en une opération d'enroulement sans problème sur le deuxième rouleau. Cela entraîne une moindre sollicitation de la bande expansible et donc également une moindre usure qui se reflètent notamment par une nette diminution du coût d'entretien.
PCT/DE2008/000754 2007-05-02 2008-05-02 Mécanisme à bande expansible guidé par rouleaux Ceased WO2008135031A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007020518.1 2007-05-02
DE200710020518 DE102007020518A1 (de) 2007-05-02 2007-05-02 Spreizbandmechanik mit Rollenführung

Publications (2)

Publication Number Publication Date
WO2008135031A2 true WO2008135031A2 (fr) 2008-11-13
WO2008135031A3 WO2008135031A3 (fr) 2009-01-22

Family

ID=39789752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/000754 Ceased WO2008135031A2 (fr) 2007-05-02 2008-05-02 Mécanisme à bande expansible guidé par rouleaux

Country Status (2)

Country Link
DE (1) DE102007020518A1 (fr)
WO (1) WO2008135031A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053071A1 (de) * 2009-11-13 2011-05-19 Festool Gmbh Führungsvorrichtung für eine Hand-Werkzeugmaschine und Hand-Werkzeugmaschine
AT521969B1 (de) * 2019-02-26 2020-07-15 Gerhard Kottek Vorrichtung zum Bewegen eines Spreizbands

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144215A (en) * 1961-01-19 1964-08-11 Dehavilland Aircraft Canada Coilable extensible apparatus
DE3737853A1 (de) * 1987-11-05 1989-05-18 Siemens Ag Vorrichtung zum verschieben eines betaetigungsorgans

Also Published As

Publication number Publication date
DE102007020518A1 (de) 2008-11-06
WO2008135031A3 (fr) 2009-01-22

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