ELABORATION OF NONCONVENTIONAL TECHNOLOGICAL METHODS AND EQUIPMENT FOR PRECESSIONAL GEARS MANUFACTURING BY MEANS OF PLASTIC MOLDING
The planetary precessional transmissions represent a new principled type of the mechanical transmission. Precessional planetary transmission has a number of advantages: increased bearing capacity, high mechanical efficiency, large kinematical possibilities. The mechanical efficiency of precessional planetary reducer is η=(0,85÷0,95 (at transmission ratio i = 10…300). The teeth of the central wheel have nonstandard variable convex-concave profile described by parametric equations according to the fundamental theory of the precessional gear. Because the teeth of the satellite have circular profile this fact allow its relative simple fabrication. The performed analysis of the state-of-the-art in the field of technology of fabrication of the wheels of the kinematical planetary precessional transmissions, demonstrated the need to elaborate the constructive-technological procedures for decreasing of the power loses. This work contains a broad justification of the method for plastic materials selection necessary for toothed wheels fabrication. As well, the plastic mass selection and functioning criteria are presented. Also a range of adequate materials for toothed wheels manufacturing are described.
2. Bostan I., Dulgheru V., Planetary precessional gear and method for its achievement. Patent MD no.1886 (2002).
3. Starzhy’nskij, V., Timofeev, B., Shalobaev, Е., Kudinov, А., Plastmassovy’e zubchaty’e kolesa v mexanizmax i priborov. Sankt-Peterburg – Gomel’: IMMSNAN B,– 538 s. (1998).
4. Zemlyakov, I., Prochnost’ detalei iz plastmass, Mashinostroenie, s. 158. (1972).
5. Bostan, I., Dulgheru, V., Dicusară, I., Bodnariuc, I., Patent no. 3623 MD. Gear wheel-tool for mould processing and procedure for its processing. Publ. BOPI no. 6/2008.