Dynamic Behavior of Heavy-Loaded Spur Gears

Abstract

In order to analyze causes of failures of heavy-loaded spur gears, the authors deal with their dynamic characteristics by considering a vibrating system composed of an effective mass of gear blanks and stiffness of meshing teeth with manufacturing errors under a given operating condition. Even in the case of gears with considerable errors the coincidence of the theoretical findings with experimental results is satisfactory. Under heavy-load conditions the plastic flow produced in the subsurface layers of gear teeth is found to affect the variation of the dynamic load considerably owing to a local change of the tooth profile. The interaction between the tooth deformation and the dynamic load is investigated experimentally and theoretically. The authors treat the conditions of initiation of the gear failures in the representative modes, e.g., pitting and scoring, in connection with the dynamic load.

Dynamic analysis of involute spur gears with asymmetric teeth

“…(11), is recommended to be between 0.1 and 0.2 by Ichimaru and Hirano [16]. In this paper, a constant value of 0.17 proposed by Dowson and Higginson [26] for the damping ratio, z, was adapted in the solution of equations.…”

“…[13,14]. Tearuchi [16]. A comparison of the theoretical and the experimental results, obtained for dynamic characteristics of the heavily loaded spur gears, was made.…”

“…In this paper, we used the following equation, which is derived by Dowson and Higginson [26] from experimental results and used by some researchers, for calculating the coefficient of friction [16][17][18][19] …”

Theoretical Aspects of Torque Responses in Spur Gearing Due to Mesh Stiffness Variation

“…The value of the damping ratio z in equation (5) has a value between 0.1 and 0.2, as measured by Ichimaru and Hirano [5]. In this paper, a constant damping ratio z ¼ 0:17 proposed by Arikan [4] is used.…”

“…During the past three decades, numerous models for gear systems have been presented for specific purposes [1]. Different models show different targets, such as dynamic tooth loads [2,3], bending stresses [4], contact stresses [5], gear errors [6][7][8], vibratory motion of gear systems [9], etc. The effects of profile errors and mesh speed on the tooth pair mesh excitation spectrum [10][11][12] were introduced, which entail a full dynamic analysis.…”