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    Kinematics of Roller Migration in the Planetary Roller Screw Mechanism

    Source: Journal of Mechanical Design:;2012:;volume( 134 ):;issue: 006::page 61006
    Author:
    Matthew H. Jones
    ,
    Steven A. Velinsky
    DOI: 10.1115/1.4006529
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper develops a kinematic model to predict the axial migration of the rollers relative to the nut in the planetary roller screw mechanism (PRSM). This axial migration is an undesirable phenomenon that can cause binding and eventually lead to the destruction of the mechanism. It is shown that this migration is due to slip at the nut–roller interface, which is caused by a pitch mismatch between the spur-ring gear and the effective nut– roller helical gear pairs. This pitch circle mismatch can be due to manufacturing errors, deformations of the mechanism due to loading, and uncertainty in the radii of contact between the components. This paper derives the angle through which slip occurs and the subsequent axial migration of the roller. It is shown that this roller migration does not affect the overall lead of the PRSM. In addition, the general orbital mechanics, in-plane slip velocity at the nut–roller interface, and the axial slip velocities at the nut–roller and the screw–roller interfaces are also derived. Finally, an example problem is developed using a range of pitch mismatch values for the given roller screw dimensions, and the axial migration and slip velocities are determined.
    keyword(s): Screws , Rollers , Mechanisms , Gears AND Spur gears ,
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      Kinematics of Roller Migration in the Planetary Roller Screw Mechanism

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/149772
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    • Journal of Mechanical Design

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    contributor authorMatthew H. Jones
    contributor authorSteven A. Velinsky
    date accessioned2017-05-09T00:53:09Z
    date available2017-05-09T00:53:09Z
    date copyrightJune, 2012
    date issued2012
    identifier issn1050-0472
    identifier otherJMDEDB-27963#061006_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/149772
    description abstractThis paper develops a kinematic model to predict the axial migration of the rollers relative to the nut in the planetary roller screw mechanism (PRSM). This axial migration is an undesirable phenomenon that can cause binding and eventually lead to the destruction of the mechanism. It is shown that this migration is due to slip at the nut–roller interface, which is caused by a pitch mismatch between the spur-ring gear and the effective nut– roller helical gear pairs. This pitch circle mismatch can be due to manufacturing errors, deformations of the mechanism due to loading, and uncertainty in the radii of contact between the components. This paper derives the angle through which slip occurs and the subsequent axial migration of the roller. It is shown that this roller migration does not affect the overall lead of the PRSM. In addition, the general orbital mechanics, in-plane slip velocity at the nut–roller interface, and the axial slip velocities at the nut–roller and the screw–roller interfaces are also derived. Finally, an example problem is developed using a range of pitch mismatch values for the given roller screw dimensions, and the axial migration and slip velocities are determined.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleKinematics of Roller Migration in the Planetary Roller Screw Mechanism
    typeJournal Paper
    journal volume134
    journal issue6
    journal titleJournal of Mechanical Design
    identifier doi10.1115/1.4006529
    journal fristpage61006
    identifier eissn1528-9001
    keywordsScrews
    keywordsRollers
    keywordsMechanisms
    keywordsGears AND Spur gears
    treeJournal of Mechanical Design:;2012:;volume( 134 ):;issue: 006
    contenttypeFulltext
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