Abstract
A detailed study on the calculating of planar mechanism degree of freedom-including gear pair was carried out in detail. By the analysis of the basis concept of constraint, the constraint type of bogus higher pair was introduced. Based on the constraint type, the classical Grübler-Kutzbach formula of planar mechanism degree of freedom is beyond doubt. In addition, the correct-ness and practicality the method for the calculation of the freedom of planer mechanism was proved. It is believed that the work will provided instructive guidance for the calculating of planar mecha-nism degree of freedom and design of planar gear-link mechanism.
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