Kinematic Synthesis of Geared Mechanisms According to Specified Gain Type
Date Issued
2009
Date
2009
Author(s)
Chen, Yen-Chun
Abstract
In this paper, based on the internal conversions of each fractionated KUs, the global gain in terms of product of gear ratios can be predicted by the propagation path and the thin-edge type of common linkage. Also, the variation of global gains due to rearrangement of input/output pair is investigated, and assignment of input and output pairs of GKCs according to specified gain type can be accomplished without forming the redundant links. The coaxial conditions contained in GKCs are identified, and a GKC with coaxial condition is capable of rearranging input/output pair. The GKCs are classified according to the type of coaxial condition. The global gain of the GKCs without coaxial condition and the GKCs with coaxial condition but is not applied to rearranging the input/output pair are defined as generic global gains. The formulation of the generic global gains are carried out by the type of propagation path and the internal conversion of each fractionated KUs, and the classification of the geared mechanisms is obtained according to the gain types, ordinary, subtractive, fractional. Rules for the variation of global gain due to the rearrangement of input/output pair are established. The global gain of GKC with rearranged input/output pair are defined as derived global gains and can be easily obtained by applying the rules. Several exemplary design of ground-adjacent input and output links geared mechanisms with desired gain type are provided for the illustration of the proposed methodology. Thus, numerous atlas of GKCs are substantially utilized in the kinematic synthesis of geared mechanisms.
Subjects
geared kinematic chain
kinematic synthesis
kinematic fractionation
gain
Type
thesis
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