Power Transmissions: Proceedings of the 4th International by Kiril Arnaudov, Dimitar Karaivanov (auth.), George Dobre

By Kiril Arnaudov, Dimitar Karaivanov (auth.), George Dobre (eds.)

This books includes the court cases of the 4th overseas convention on energy Transmissions, that was once held in Sinaia, Romania from June 20 -23, 2012. energy Transmissions is a truly advanced and multi-disciplinary medical box of Mechanical Engineering that covers the different sorts of transmissions (mechanical, hydraulic, pneumatic) in addition to the entire computer components concerned, reminiscent of gears, bearings, shafts, couplings and much more. It issues not just their simple idea but in addition their layout, research, trying out, program and upkeep. the necessities set to fashionable energy transmissions are quite difficult to fulfill: they should be extra effective, improved, smaller, noiseless, more straightforward to supply and to price much less. there's a robust call for to develop into more uncomplicated in operation and upkeep, or perhaps computerized and in maintenance-free. final yet no longer least, they need to be simply recycled and recognize the surroundings. Joint efforts of experts from either academia and can considerably give a contribution to satisfy those wishes. the most objective of this convention used to be to compile specialists from worldwide and current the most recent advancements within the box of energy Transmissions.

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Extra resources for Power Transmissions: Proceedings of the 4th International Conference, held at Sinaia, Romania, June 20 -23, 2012

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The number of teeth conducting the load simultaneously in the gearing is z = (z4 - 1)/2 for the number of teeth z4 with couples. The remained teeth contact between each other with passive flanks. It is necessary to specify a number of features of precessional transmissions 2K-H, which gives them higher performance compared to similar planetary transmission with cylindrical wheels: • Precessional transmissions do not require compliance of equal distance between the axes, which fact broadens their optimum design field; • Kinematics of precessional transmissions does not limit the choice of teeth modules of the gear torque or rollers location pitch, which increases the possibilities of generation of tooth numbers torque and gear ratio interval; • Characteristics of the designed precessional gearings, unlike traditional involute gears, enlarge considerably kinematical possibilities and performances of precessional transmissions.

Fig. 1 Geared transmission for a turbo-fan engine Ring Gear Sun Gear Fluid Film BRG Planet Gear New Tendencies in the Design of the Modern Aerospace Transmissions 47 2 Wave Bearing Concept The wave bearing was introduced by Dimofte (1995a, b), as an alternative to the plain (circular) journal bearing. Unlike the plain bearing, the wave bearing has a slight continuous variation of its profile. The variation is such that a continuous waved profile is circumscribed onto the non-rotating bearing surface.

Planetary precessional transmissions K-H-V. Kinematical structure of precessional transmission K-H-V (Fig. 1a) has four components: planet (wheel) carrier H, satellite gear g, central wheel b and the casing (framework). Satellite gear g and the central wheel b are under internal gearing, and their teeth generators cross in a 24 I. Bostan b g H ω2 ω1 ω1 Zb Zg Zb (a) (b) (c) g Zg b H V W H δ ωV θ ω1 g b b Zb Zb g1 V ω2 ωM h V ω2 θ ω1 Zg b V H ω2 θ θ Zb W W H Zg g b g W θ θ2 W ω3 ωV W2 g2 g1 V2 (f) (e) (d) Z2 Z3 V θ1 ω H Zb Zg g2 Z H W1 H g b b H V ω1 ωH V ω2 ω1 g Vg 2A (g) Vtb Zb Zg (h) Fig.

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