Transient non-Newtonian Elastohydrodynamics of Rough Meshing Hypoid Gear Teeth Subjected to Complex Contact Kinematics

2021 ◽  
pp. 107398
Author(s):  
Gajarajan Sivayogan ◽  
Ramin Rahmani ◽  
Homer Rahnejat
Keyword(s):  
Hypoid Gear ◽  
Gear Teeth ◽  
Contact Kinematics

Pitting Resistance and Bending Strength of Bevel and Hypoid Gear Teeth

1992 ◽  
Author(s):  
B.-R. Höhn ◽  
H. Winter ◽  
K. Michaelis ◽  
F. Vollhüter
Keyword(s):  
Bending Strength ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Hypoid Gear ◽  
Hypoid Gears ◽  
Gear Teeth ◽  
Bevel Gears ◽  
Load Carrying ◽  
Calculation Results ◽  
Good Agreement

Abstract Bevel and hypoid gears are widely used for gears with crossed axis. The influence of a pinion offset on the load carrying capacity — pitting resistance and bending strength — is introduced in a different way in commonly used calculation methods. Load carrying and measurement investigations on the influence of pinion offset on pitting resistance and bending strength are reported. Tests show an increasing bending strength and decreasing maximum tooth root stresses with increasing pinion offset. Also a slight increase of pitting resistance and a slight decrease of the Hertzian pressure was evaluated. The load carrying calculation results for bevel gears without pinion offset, DIN 3991, is in good agreement with test results. The bending strength of hypoid gears calculated according to Niemann/Winter, is greater than that experimentally measured. For pitting resistance, however, the calculation is less than the measured results.

scholarly journals Multiphysics Investigations on the Dynamics of Differential Hypoid Gears

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
M. Mohammadpour ◽  
S. Theodossiades ◽  
H. Rahnejat
Keyword(s):  
Multiscale Analysis ◽  
Point Contact ◽  
Elastohydrodynamic Lubrication ◽  
Transmission Efficiency ◽  
Operating Conditions ◽  
Hypoid Gear ◽  
Tooth Contact Analysis ◽  
Hypoid Gears ◽  
Gear Teeth ◽  
Noise Vibration

Vehicular differential hypoid gears play an important role on the noise, vibration, and harshness (NVH) signature of the drivetrain system. Additionally, the generated friction between their mating teeth flanks under varying load-speed conditions is a source of power loss in a drivetrain while absorbing some of the vibration energy. This paper deals with the coupling between system dynamics and analytical tribology in multiphysics, multiscale analysis. Elastohydrodynamic lubrication (EHL) of elliptical point contact of partially conforming hypoid gear teeth pairs with non-Newtonian thermal shear of a thin lubricant film is considered, including boundary friction as the result of asperity interactions on the contiguous surfaces. Tooth contact analysis (TCA) has been used to obtain the input data required for such an analysis. The dynamic behavior and frictional losses of a differential hypoid gear pair under realistic operating conditions are therefore determined. The detailed analysis shows a strong link between NVH refinement and transmission efficiency, a finding not hitherto reported in literature.

A Scoring Formula for Bevel and Hypoid Gear Teeth

1967 ◽  
Vol 89 (2) ◽  
pp. 114-123 ◽  
Author(s):  
W. Coleman
Keyword(s):  
Hypoid Gear ◽  
Gear Teeth

Synthesis of Hypoid Gear Surface Topography by a Nonlinear Least Squares Approach

2007 ◽  
Author(s):  
A. Artoni ◽  
M. Gabiccini ◽  
M. Guiggiani
Keyword(s):  
Least Squares ◽  
Trust Region ◽  
Nonlinear Least Squares ◽  
Hypoid Gear ◽  
Gear Teeth ◽  
Angle Correction ◽  
Marquardt Algorithm ◽  
Numerical Instabilities ◽  
Feasible Solutions ◽  
Spiral Angle

This paper outlines a systematic methodology for finding the machine setting corrections required to obtain a predesigned ease-off surface in spiral bevel and hypoid gear teeth. The problem is given a nonlinear least squares formulation which, however, is highly prone to numerical instabilities. The Levenberg–Marquardt algorithm with a trust region strategy turned out to be quite effective and robust to obtain feasible solutions. The proposed method was tested on lengthwise crowning, profile crowning and spiral angle correction. In all cases, the goal was achieved with very high accuracy, in a few iterations and, remarkably, with different sets of machine parameters.

Chemo-mechanical characterization of phosphorus and sulfur containing ashless tribofilms on hypoid gear teeth

2021 ◽  
Vol 158 ◽  
pp. 106926 ◽  
Author(s):  
David C. Roache ◽  
Clifton H. Bumgardner ◽  
Yunya Zhang ◽  
David Edwards ◽  
David DeGonia ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Hypoid Gear ◽  
Gear Teeth ◽  
Sulfur Containing

Parametric relationship between hypoid gear teeth and accurate face-milling cutter

2020 ◽  
Vol 8 (4) ◽  
pp. 537-555
Author(s):  
Mahmoud Rababah ◽  
Muhammad Wasif ◽  
Syed Amir Iqbal
Keyword(s):  
Face Milling ◽  
Hypoid Gear ◽  
Milling Cutter ◽  
Gear Teeth ◽  
Parametric Relationship

An Approach for Determination of Basic Machine-Tool Settings From Blank Data in Face-Hobbed and Face-Milled Hypoid Gears

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Ignacio Gonzalez-Perez ◽  
Alfonso Fuentes ◽  
Ramon Ruiz-Orzaez
Keyword(s):  
Machine Tool ◽  
Normal Pressure ◽  
Hypoid Gear ◽  
Hypoid Gears ◽  
Gear Teeth ◽  
Gear Drive ◽  
Gear Geometry ◽  
Gear Drives ◽  
Crown Gear

The conditions of meshing and contact in hypoid gear drives depend substantially on the machine-tool settings to be applied. Determination of gear geometry is the first step in the design process of a hypoid gear drive. An approach for determination of basic machine-tool settings for face-hobbed and face-milled hypoid gears is proposed, covering the cases when the gear is generated and nongenerated. Gear basic machine-tool settings are determined from the blank data that can be obtained from application of Standard ANSI/AGMA 2005-C96. Some machine-tool settings are determined analytically considering the imaginary generation of the gear by a crown gear. Some other machine-tool settings are obtained numerically in order to provide some given blank data as the normal chordal tooth thickness and the normal pressure angles of the gear teeth. The developed theory is illustrated with numerical examples.

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