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WO2008128512A2 - Mécanisme de bande d'écartement - Google Patents

Mécanisme de bande d'écartement Download PDF

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Publication number
WO2008128512A2
WO2008128512A2 PCT/DE2008/000631 DE2008000631W WO2008128512A2 WO 2008128512 A2 WO2008128512 A2 WO 2008128512A2 DE 2008000631 W DE2008000631 W DE 2008000631W WO 2008128512 A2 WO2008128512 A2 WO 2008128512A2
Authority
WO
WIPO (PCT)
Prior art keywords
spreader
take
roll
spreizbandmechanik
roller
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/DE2008/000631
Other languages
German (de)
English (en)
Other versions
WO2008128512A3 (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 WO2008128512A2 publication Critical patent/WO2008128512A2/fr
Publication of WO2008128512A3 publication Critical patent/WO2008128512A3/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 thus to provide an improved spreading band mechanism in which the stress of the expanding band is significantly reduced, in particular during the transition from the wound to the unwound stretched state, and at the same time a more efficient and precise force transmission is made 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 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 take place continuously, so that the spreader can be transferred continuously in relation to its longitudinal direction in the winding state. This transfer is reversible, so that the spreader at any time back into the extended state is feasible, in which it has the profile again.
  • the spreading belt mechanism according to the invention further comprises a take-up roll for rolling up and unrolling the spreading belt. That portion of the spreader, which is located between the winding roller and the stretched part of the spreader, undergoes a bending moment, by which the spreader at this position of the stretched state in the winding state is transferred. 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 roll large lengths of the spreader can be kept in a small space.
  • the expanding band mechanism according to the invention has a plurality of rotatable rolling elements for positively guiding the spreading band, which are arranged circumferentially around the spreading band wound up on the winding roll.
  • the rolling friction occurring in the guidance of the expanding belt is significantly reduced in comparison with the sliding friction occurring in the case of a guide through a sliding shoe (according to the prior art).
  • the reduced friction leads to less wear and thus to increased reliability and longevity of Sp lanternband entry.
  • the advantages of the Sp Dretzband entry invention are particularly clear at high speeds of the spreader, as it usually comes to increased forces between the spreader and its leadership. By the roller elements increased frictional forces between the spreader and its leadership are avoided. Thus, it does not overheat the spreader and the resulting wear.
  • the rolling elements may preferably be formed by rollers whose axes are parallel to the axis of the take-up roll. Alternatively, but also balls could be used, which press on the surface of the spreader and force it to rest on the take-up reel.
  • the spreader mechanism has a plurality of rollers, which together form a roller conveyor.
  • the roller conveyor surrounds the spreader belt rolled up on the take-up roll circumferentially completely or in sections. se, but with a Einfädelö réelle remains kept. Due to the roller conveyor, the guidance of the spreader belt is determined in the entire area of the take-up roll.
  • the spreader is passed through the threading and can be wound on the take-up reel with very low friction and unwound from the take-up reel.
  • the roller conveyor is arranged substantially circular, since it encloses the take-up roller circumferentially.
  • the expanding band mechanism according to the invention can be designed such that it has rollers for the positive guidance of the expansion band only in the transition region from the extended state to the winding state of the spreader belt. Outside this transition region, the spreader belt can be guided by a sliding shoe or the like.
  • the rollers are preferably urged by force on the wound on the take-up reel spreader. Consequently, the rollers can adjust in terms of their distance from the take-up reel of the amount of rolled up on the take-up reel spreader.
  • the rollers can be urged, for example, by springs or actuators on the rolled-up on the take-up reel spreader. There is a larger amount of spreader on the take-up reel, so the radius of a spreader roll formed by the wound spreader is significantly larger than the radius of the take-up roll. If, on the other hand, there is little spread on the take-up roll, the radius of the take-up roll is barely greater than the radius of the take-up roll.
  • the arrangement of the rollers is adapted to the ever-changing radius of the spreader roll formed by the wound spreader ribbon.
  • the spreading band mechanism according to the invention, it is ensured that the spreading band is guided in a defined manner in the region between the rollers and the already wound spreader belt. Otherwise it could come in this area to an uncontrolled transfer from the stretched state to the winding state, whereby the spreader would be unnecessarily stressed.
  • the roller conveyor is divided into several segments. The rollers are arranged in segments and thus also in segments urged onto the wound on the take-up reel spreader. The segmental construction of the roller conveyor simplifies the movable storage of the rollers, since not every roller is individually pushed onto the spreader roll wound on the take-up reel.
  • the segments each comprise a bracket on which the rollers of the respective segment are arranged.
  • the brackets are each pivotally mounted relative to the winding roller and urged by a spring or an actuator against the wound on the take-up spreader.
  • the roller conveyor can for example be divided into two segments, approximately 180 °, or three segments, approximately 120 °.
  • the brackets then have approximately the shape of the corresponding circular segment and have bearings for the storage of roles.
  • the brackets may each be rotatably mounted at one of its ends, wherein the spring or the actuator is formed by a compression spring which urges the bracket against the wound on the take-up reel spreader.
  • the rollers of the segments are each connected flexibly to one another, so that the segments each form a roller chain.
  • the roller chains are each stretched around a circular segment of the spreading belt roll formed by the wound spreader.
  • the flexible roller chains can adapt to the variable curvature of the circumference of the spreader roll. This ensures that as many of the rollers of each segment roll on the surface of the Sp Schwarzbandrolle as possible.
  • the roller conveyor may be formed by two segments, each stretched by almost 180 ° of the circumference of the Sp Schwarzbandrolle are.
  • the two roller chains can be stretched for example by a tension spring or an actuator.
  • the take-up roll is preferably drivable.
  • the driving torque of the take-up roll is transferred during unwinding of the spreader due to the leadership by the rollers loss and precise as a thrust on the stretched part of the spreader.
  • the take-up reel can also be braked or operated free-running.
  • the rollers are preferably designed as cylindrical needle rollers.
  • the axes of all needle rollers and the take-up reel are aligned parallel to each other. All needle rollers are the same and have a length which is greater than the width of the spreader, so that the spreader is guided in its entire width, thereby a tape guide can be done by the rollers in the radial direction.
  • a guide of the band in the axial direction can hereby preferably be accomplished by means of flat side windows, in particular two flat side windows.
  • Needle rollers can be arranged due to their small diameter at a small distance from each other, so that an accurate guidance of the spreader is possible.
  • the running surface of the rollers can be adapted to a longitudinal profile or a remaining transverse profile of the spreading belt. It is also conceivable that the roller length is chosen to be smaller than or equal to the width of the spreader, in particular if no space is available laterally of the take-up reel.
  • 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, are also wavy or triangular profiles usable.
  • 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. 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 non-profiled 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. 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 in the take-up roll.
  • Fig. 1 is a schematic representation of a preferred embodiment of an expansion band 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 illustrating the forces acting on the Ab-- ekeleln forces.
  • Fig. 1 shows a schematic diagram of a preferred embodiment of a spread tape 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 take-up roll 02.
  • a tool may be attached, which is to be positioned by 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 02 is in a winding state.
  • the other portion of the spreader belt 01 shown is in an extended condition.
  • the spreading belt 01 is stretched in a straight line substantially rectilinear and has a curved profile.
  • 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.
  • the spreader roller 03 is enclosed almost over its entire circumference by the needle rollers 04. However, the spreader roller 03 is not edged by the needle rollers in an area of a threading opening 06.
  • the threading opening 06 serves to carry out the spreading belt 01, so that this can be wound onto the take-up reel 02, or unwound from the unwinding reel 02.
  • All needle rollers 04 form a nearly circular roller conveyor.
  • the needle rollers 04 are distributed on two segment bracket 07 of the roller conveyor.
  • Each of the two segmental yokes 07 is rotatably mounted in a pivot point 08, so that the segmental yokes 07 can be pivoted in the direction of the take-up roller 02.
  • Furthermore acts on each of the two segmental yoke 07 each have a compression spring 09, which urges the segmental bracket 07 in the direction of the take-up roll 02. This ensures that even then a large proportion of the needle rollers 04 is in contact with the surface of the spreader roller 03 when the Sp Schwarzbandrolle 03 is largely unwound and consequently has a reduced radius.
  • the spreading belt 01 If the spreading belt 01 is moved in the direction of the take-up roll 02, it is pushed into the circular roller conveyor formed by the needle rollers 04, so that a bending moment acts on the transition region between the stretched section and the section in the winding state. As a result of the bending moment, the spreading belt 01 is continuously transferred into the winding state, whereby the bending moment is simultaneously reduced. This transition is continuous and continuous.
  • the expansion belt 01 winds on the take-up roll 02, regardless of whether the take-up roll 02 is driven and thereby exerts a tensile force on the spreading belt 01 or whether take-up roll 02 is free-running.
  • Hg. 2 shows a schematic diagram for illustrating the forces acting during winding. This schematic diagram is based on the spreading band mechanism shown in FIG.
  • the friction of the spreading belt 01 relative to the roller belt has a coefficient of friction ⁇ .
  • FIG. 3 shows a schematic representation for illustrating the forces acting on the wiper.
  • This schematic diagram is again based on the spreading band mechanism shown in FIG. 1, wherein the illustration of individual features has been omitted for reasons of clarity.
  • a torque M 1 acts, so that the spreading belt 01 is moved in a direction 12.
  • the torque Mi acts counter to a thrust force F s on the spreading belt 01.
  • From the Sp Dreckbandrolle 03 act single forces FRy on the roller belt.
  • individual forces F 0x act on the surface of the spreader roller 03.
  • the friction of the spreader belt 01 with respect to the roller belt has a coefficient of friction ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Basic Packing Technique (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 un rouleau de bobinage destiné au bobinage et au débobinage de la bande d'écartement. Le mécanisme de bande d'écartement comprend également plusieurs éléments roulants qui servent à réaliser un guidage forcé et sont disposés autour de la bande d'écartement enroulée sur le rouleau de bobinage. Les éléments roulants permettent de réduire significativement les frottements qui surviennent lors du guidage de la bande d'écartement, par rapport à un guidage effectué par un patin de guidage de l'état de la technique. La diminution des frottements conduit à une usure réduite et ainsi à de meilleures fiabilité et longévité du système de guidage de bande d'écartement.
PCT/DE2008/000631 2007-04-18 2008-04-16 Mécanisme de bande d'écartement Ceased WO2008128512A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710018162 DE102007018162A1 (de) 2007-04-18 2007-04-18 Spreizbandmechanik
DE102007018162.2 2007-04-18

Publications (2)

Publication Number Publication Date
WO2008128512A2 true WO2008128512A2 (fr) 2008-10-30
WO2008128512A3 WO2008128512A3 (fr) 2009-02-12

Family

ID=39767822

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/000631 Ceased WO2008128512A2 (fr) 2007-04-18 2008-04-16 Mécanisme de bande d'écartement

Country Status (2)

Country Link
DE (1) DE102007018162A1 (fr)
WO (1) WO2008128512A2 (fr)

Families Citing this family (1)

* 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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB706282A (en) * 1951-11-15 1954-03-24 Moeller & Neumann Gmbh Improvements in or relating to strip coilers for use with metal strip rolling mills
US3371453A (en) * 1964-08-03 1968-03-05 Dehavilland Aircraft Canada Cassette stem device
US4225871A (en) * 1977-06-28 1980-09-30 Luigi Ramari Collapsible, flattenable and drum wrappable type of radio antenna, particularly for motor-vehicles and moving equipments
GB2109348B (en) * 1981-11-05 1985-03-20 Head Wrightson Mach Apparatus for coiling strip

Also Published As

Publication number Publication date
WO2008128512A3 (fr) 2009-02-12
DE102007018162A1 (de) 2008-10-23

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