ESFA 2003 – R 10
THE GEAR SYNTHESIS WITH THE BEST EFFICIENCY Relly PETRESCU1, Florian PETRESCU2 Chair GDGI, Bucharest Polytechnic University, ROMANIA, victoriap@emoka.ro 2 Chair TMR, Bucharest Polytechnic University, ROMANIA,
1
ABSTRACT The paper presents an original method to determinate the efficiency of the gear. The originality of this method consist in the eliminated of the friction modulus. On analyze the influence of few parameters about the efficiency value. These parameters are: z1 - the number of tooth’s for the primary wheel of gear; z2 - the number of tooth’s for the secondary wheel of gear; α0 the pressure angle normal on the divided circle; β - the inclination angle. With the relations of this presentment, on can synthesizing the gear mechanisms. KEY WORDS: efficiency, gear, constructive parameters, tooth, wheel, circle.
INTRODUCTION In this paper the authors presents an original method to calculate the efficiency of the gear. The originality n © 2002 Victoria PETRESCU 2 consist in the way to determinate the t efficiency of the v2 gear, because on Fτ are not utilized the α1 friction forces of P F m couple (this new way eliminate the v1 rp1 classical method). α1 Fψ K1 On eliminate too the necessity to v12 determinate the rb1 t friction coefficients O1 by different n ω1 experimental 0 1 methods. The determinates Fig. 1. The forces of the gear efficiency by the new method is the same like the classical efficiency, namely the mechanical efficiency of the gear. The model taken in calculation is very simple. It can be fallowed in figure 1.
63