scholarly journals Influence of profile modifications on meshing stiffness, load sharing, and trasnsmission error of involute spur gears

2019 ◽  
Vol 139 ◽  
pp. 506-525 ◽  
Author(s):  
Miryam B. Sánchez ◽  
Miguel Pleguezuelos ◽  
José I. Pedrero
Keyword(s):  
Load Sharing ◽  
Spur Gears ◽  
Meshing Stiffness

scholarly journals On the evaluation of the meshing stiffness of external spur gears

2020 ◽  
Vol 317 ◽  
pp. 01002
Author(s):  
Miguel Pleguezuelos ◽  
Miryam B. Sánchez ◽  
José I. Pedrero
Keyword(s):  
Load Sharing ◽  
Contact Stresses ◽  
Spur Gears ◽  
Tooth Root ◽  
Meshing Stiffness

A comparison among different approaches of the meshing stiffness of spur gears has been carried out. The influence of each one on the load sharing, and subsequently on the determinant tooth-root and contact stresses, has also been studied. Equations for the evolution of the meshing stiffness along the path of contact according to all these formulations are also provided.

scholarly journals Analytical Expressions of the Efficiency of Standard and High Contact Ratio Involute Spur Gears

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Miguel Pleguezuelos ◽  
José I. Pedrero ◽  
Miryam B. Sánchez
Keyword(s):  
Friction Coefficient ◽  
Contact Point ◽  
Load Sharing ◽  
Gear Ratio ◽  
Spur Gears ◽  
Contact Ratio ◽  
Transmission Parameters ◽  
Constant Friction ◽  
Analytical Expressions ◽  
Approximate Expressions

Simple, traditional methods for computation of the efficiency of spur gears are based on the hypotheses of constant friction coefficient and uniform load sharing along the path of contact. However, none of them is accurate. The friction coefficient is variable along the path of contact, though average values can be often considered for preliminary calculations. Nevertheless, the nonuniform load sharing produced by the changing rigidity of the pair of teeth has significant influence on the friction losses, due to the different relative sliding at any contact point. In previous works, the authors obtained a nonuniform model of load distribution based on the minimum elastic potential criterion, which was applied to compute the efficiency of standard gears. In this work, this model of load sharing is applied to study the efficiency of both standard and high contact ratio involute spur gears (with contact ratio between 1 and 2 and greater than 2, resp.). Approximate expressions for the friction power losses and for the efficiency are presented assuming the friction coefficient to be constant along the path of contact. A study of the influence of some transmission parameters (as the gear ratio, pressure angle, etc.) on the efficiency is also presented.

Stress Analysis of Cylindrical Webbed Spur Gears: Parametric Study

1998 ◽  
Vol 120 (2) ◽  
pp. 349-357 ◽  
Author(s):  
H. C. Kim ◽  
J. P. de Vaujany ◽  
M. Guingand ◽  
D. Play
Keyword(s):  
Simple Formula ◽  
Computer Software ◽  
Web Design ◽  
Maximum Principal Stress ◽  
Design Parameters ◽  
Preliminary Design ◽  
Spur Gears ◽  
Tooth Root ◽  
Detailed Design ◽  
Meshing Stiffness

In this paper, a numerical computer software based on the Finite Prism Method, is proposed in order to design external cylindrical spur gears with a web. It enables computing load sharing, pressure distribution, meshing stiffness and 3D tooth fillet stresses. The software is generally used during the detailed design for optimizing gear meshing. The software is also used to quantify the influences of web design parameters. The process is based on a statistical method: experimental design, that permits studying the influence of parameters. Thus, a simple formula was found in order to estimate the maximum principal stress in the tooth root. The results of the formula were compared with those found in the bibliography. The formula can be useful during the preliminary design for predimensioning webbed spur gears in design department.

scholarly journals Dynamical Modelling and Simulation of Spur Gears with Flank Pitch Error

2021 ◽  
Author(s):  
Lizhuang Tao ◽  
De Tian ◽  
Shize Tang ◽  
Xiaoxuan Wu ◽  
Bei Li
Keyword(s):  
Dynamic Models ◽  
Vibration Signal ◽  
Spur Gear ◽  
Transmission Model ◽  
Spur Gears ◽  
Meshing Stiffness ◽  
Pitch Error ◽  
Gear Fault ◽  
Tooth Flank ◽  
The Impact

Abstract Gearbox is commonly regarded as the most important power section of wind turbines which has been widely valued for its high malfunction rate. Gear fault researches mainly include wearing, pitting, spalling, breakage, falling off, etc, while little attention was paid to tooth Flank Pitch Error(FPE). Taking a single-stage parallel shaft spur gear as the research object, an 8-DOF gear transmission model and the FPE model were established in this paper and the gear’s time-varying meshing stiffness (TVMS) models with & without tooth FPE were obtained respectively, which the dynamic models with various tooth FPE values under different rotating speeds were simulated after. The simulation results showed that the TVMS mathematical model proposed in the paper under tooth FPE is practical at both low and high rotating speeds. Under the FPE model, side-bands are formed around each multiple of meshing frequency whose peaks are distributed by a fixed fault characteristic frequency ffp interval. The gearbox vibrates severely as the tooth FPE values and rotational speed grow. The peak value of the vibration signal is about 3 times that in case of fault-free state when the FPE value reaches 0.001rad, thus the impact of FPE on gearboxes cannot be neglected.

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