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Transmission errors in precision worm gear drives

Fish, Michael Anderson (1998) Transmission errors in precision worm gear drives. Doctoral thesis, University of Huddersfield.

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    Transmission error is a measure of the positioning accuracy of a gear system. This
    has been widely documented in gearing for many years as the source of problems in
    noise and vibration. It is a result of errors in the contact conditions which affect the
    driven gear with respect to the rotation of the driver gear. This research aims to
    present a better understanding of the basic kinematics of worm gear systems by
    identifying the significant influences which determine the contact conditions.

    A literature review of existing theory is described which determines the major areas
    considered in worm gear contact analysis. Formulae are derived which quantify the
    effect of component parameter variation on contact. An investigation of the design,
    manufacture, and operating processes is recorded which identifies error sources
    relative to the theoretical contact condition. A computer program is developed which
    calculates contact characteristics such as worm and wheel component form,
    transmission error and contact marking pattern for a given design including any
    contact error sources. Computer calculations are validated by comparing direct
    measurements of these characteristics from several manufactured gear sets with
    synthesised results produced using the design information, machine settings and error
    sources detected during production. The behaviour of these gear sets during operation
    under a torque load has been investigated experimentally. Measured transmission
    error data from a test rig is used to develop a basic model of worm gear deformation
    under load. This model has been added to the computer program to improve and
    extend the analysis capability. The test rig has also been used to investigate the effect
    of initial wear on contact characteristics.

    The good correlation between calculated and experimental results shows that the
    characteristics of a worm gear set can be predicted once all elements of the design and
    manufacture are known. The results also validate the software as a useful design tool
    for academic and industrial applications. Important conclusions are drawn on design
    techniques, the manufacturing process, and the effects of operating under load.
    Further areas of investigation are identified which offer future research an opportunity
    to expand upon these conclusions.

    Item Type: Thesis (Doctoral)
    Additional Information: EThOS Persistent ID
    Uncontrolled Keywords: Geometry, Gear box assembly, Machinery Tools, Testing Laboratories, Machinery Testing
    Subjects: T Technology > TJ Mechanical engineering and machinery
    T Technology > TL Motor vehicles. Aeronautics. Astronautics
    Schools: School of Computing and Engineering
    Depositing User: Graham Stone
    Date Deposited: 30 Jun 2009 16:10
    Last Modified: 28 Jul 2010 19:39


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