SOME PARTICULARITIES OF INTERNAL-EXTERNAL GEAR PAIRS WITH ZERO DIFFERENCE IN NUMBERS OF TEETH

Ioan DOROFTEI, Ovidiu-Vasile CRIVOI, Cristina-Magda CAZACU, Stelian ALACI

Abstract


Geared mechanisms using internal-external gear pairs with a small difference in the number of teeth are well-known for the advantages they offer. Internal-external gear pairs with zero difference in the number of teeth represent a special case of this category of gear drives. Even if they have a transmission ratio equal to unity these gear pairs can be used both for transmitting rotational motion in the same direction between two shafts with a very small distance between their axes, and in the construction of cycloidal reducers. Because the difference in the number of teeth is zero, most of the mathematical equations used for internal-external gear drive with this difference bigger than zero are not valid any more. In this paper, a part of the mathematical equations which are only specific to these gear drives will be presented and discussed. More specific equations will be presented in future work.

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References


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