Development Of Tooth Contact And Mechanical Efficiency Models For Face Milled And Face Hobbed Hypoid And Spiral Bevel Gears

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Development of Tooth Contact and Mechanical Efficiency Models for Face-milled and Face-hobbed Hypoid and Spiral Bevel Gears

Author : Mohsen Kolivand
Publisher :
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.:/5 (679 download)

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Book Synopsis Development of Tooth Contact and Mechanical Efficiency Models for Face-milled and Face-hobbed Hypoid and Spiral Bevel Gears by : Mohsen Kolivand

Download or read book Development of Tooth Contact and Mechanical Efficiency Models for Face-milled and Face-hobbed Hypoid and Spiral Bevel Gears written by Mohsen Kolivand and published by . This book was released on 2009 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A computationally efficient load distribution model is proposed for both face-milled and face-hobbed hypoid gears produced by Formate and generate processes. Tooth surfaces are defined directly from the cutter parameters and machine settings. A novel methodology based on the ease-off topography is used to determine the unloaded contact patterns. The proposed ease-off methodology finds the instantaneous contact curves through a surface of roll angles, allowing an accurate unloaded tooth contact analysis in a robust and accurate manner. Rayleigh-Ritz based shell models of teeth of the gear and pinion are developed to define the tooth compliances due to bending and shear effects efficiently in a semi-analytical manner. Base rotation and contact deformation effects are also included in the compliance formulations. With this, loaded contact patterns and transmission error of both face-milled and face-hobbed spiral bevel and hypoid gears are computed by enforcing the compatibility and equilibrium conditions of the gear mesh. The proposed model requires significantly less computational effort than finite elements (FE) based models, making its use possible for extensive parameter sensitivity and design optimization studies. Comparisons to the predictions of a FE hypoid gear contact model are also provided to demonstrate the accuracy of the model under various load and misalignment conditions. The proposed ease-off formulation is generalized next to include various types of tooth surface deviations in the tooth contact analysis. These deviations are grouped in two categories. The proposed ease-off based method is shown to be capable of modeling both global deviations due to common manufacturing errors and heat treat distortions and local deviations due to surface wear. The proposed loaded contact model is combined at the end with a friction model based on a mixed elastohydrodynamic lubrication model to predict the load dependent (mechanical) power losses and efficiency of the hypoid gear pairs. The velocity, radius of curvature and load information predicted by the contact model is input to the friction model to determine the distribution of the friction coefficient along the contact surfaces. At the end, the variations of predicted mechanical efficiency with geometry, surface and lubricant parameters are quantified.

Experimental Comparison of Face-Milled and Face-Hobbed Spiral Bevel Gears

Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Experimental Comparison of Face-Milled and Face-Hobbed Spiral Bevel Gears by :

Download or read book Experimental Comparison of Face-Milled and Face-Hobbed Spiral Bevel Gears written by and published by . This book was released on 2001 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental comparison of face-milled and face-hobbed spiral bevel gears was accomplished. The two differently manufactured spiral bevel gear types were tested in a closed-loop facility at NASA Glenn Research Center. Strain, vibration, and noise testing were completed at various levels of rotational speed and load. Tests were conducted from static (slow-roll) to 12600 rpm and up to 269 N.m (2380 in.lb) pinion speed and load conditions. The tests indicated that the maximum stress recorded at the root locations had nearly the same values, however the stress distribution was different from the toe to the heel. Also. the alternating stress measured was higher for the face-milled pinion than that attained for the face-bobbed pinion (larger minimum stress). The noise and vibration results indicated that the levels measured for the face-bobbed components were less than those attained for the face-milled gears tested.

Power Transmissions

Author : Datong Qin
Publisher : CRC Press
ISBN 13 : 1315386801
Total Pages : 2126 pages
Book Rating : 4.3/5 (153 download)

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Book Synopsis Power Transmissions by : Datong Qin

Download or read book Power Transmissions written by Datong Qin and published by CRC Press. This book was released on 2016-11-10 with total page 2126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents papers from the International Conference on Power Transmissions 2016, held in Chongqing, China, 27th-30th October 2016. The main objective of this conference is to provide a forum for the most recent advances, addressing the challenges in modern mechanical transmissions. The conference proceedings address all aspects of gear and power transmission technology and a range of applications. The presented papers are catalogued into three main tracks, including design, simulation and testing, materials and manufacturing, and industrial applications. The design, simulation and testing track covers topics such as new methods and designs for all types of transmissions, modelling and simulation of power transmissions, strength, fatigue, dynamics and reliability of power transmissions, lubrication and sealing technologies and theories, and fault diagnosis of power transmissions. In the materials and manufacturing track, topics include new materials and heat treatment of power transmissions, new manufacturing technologies of power transmissions, improved tools to predict future demands on production systems, new technologies for ecologically sustainable productions and those which preserve natural resources, and measuring technologies of power transmissions. The proceedings also cover the novel industrial applications of power transmissions in marine, aerospace and railway contexts, wind turbines, the automotive industry, construction machinery, and robots.

Journal of Mechanical Design

Author :
Publisher :
ISBN 13 :
Total Pages : 712 pages
Book Rating : 4.4/5 (91 download)

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Book Synopsis Journal of Mechanical Design by :

Download or read book Journal of Mechanical Design written by and published by . This book was released on 2008-07 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Computerized Design, Generation, and Simulation of Meshing and Contact of Face-Milled Formate Cut Spiral Bevel Gears

Author :
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Computerized Design, Generation, and Simulation of Meshing and Contact of Face-Milled Formate Cut Spiral Bevel Gears by :

Download or read book Computerized Design, Generation, and Simulation of Meshing and Contact of Face-Milled Formate Cut Spiral Bevel Gears written by and published by . This book was released on 2001 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new approach for design, generation, and computerized simulation of meshing and contact of face-milled, formate cut spiral bevel gears is presented. The purpose is to develop a low noise, stabilized bearing contact for this type of gear drives. The approach proposed is based on application of three procedures that permit in sequence, to provide a longitudinally directed bearing contact, a predesigned parabolic function of transmission errors and limit the shift of bearing contact caused by errors of alignment. The theory developed is illustrated with an example of design and computation.

An Accurate Approach to Modeling the Genuine Tooth Surfaces of the Face-Milled Spiral Bevel and Hypoid Gears

Author : Shuangxi Xie
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis An Accurate Approach to Modeling the Genuine Tooth Surfaces of the Face-Milled Spiral Bevel and Hypoid Gears by : Shuangxi Xie

Download or read book An Accurate Approach to Modeling the Genuine Tooth Surfaces of the Face-Milled Spiral Bevel and Hypoid Gears written by Shuangxi Xie and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears

Author : F. L. Litvin
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears by : F. L. Litvin

Download or read book Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears written by F. L. Litvin and published by . This book was released on 1996 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Mechanism and Machine Science

Author : Tadeusz Uhl
Publisher : Springer
ISBN 13 : 3030201317
Total Pages : 4248 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Advances in Mechanism and Machine Science by : Tadeusz Uhl

Download or read book Advances in Mechanism and Machine Science written by Tadeusz Uhl and published by Springer. This book was released on 2019-06-13 with total page 4248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 15th IFToMM World Congress, which was held in Krakow, Poland, from June 30 to July 4, 2019. Having been organized every four years since 1965, the Congress represents the world’s largest scientific event on mechanism and machine science (MMS). The contributions cover an extremely diverse range of topics, including biomechanical engineering, computational kinematics, design methodologies, dynamics of machinery, multibody dynamics, gearing and transmissions, history of MMS, linkage and mechanical controls, robotics and mechatronics, micro-mechanisms, reliability of machines and mechanisms, rotor dynamics, standardization of terminology, sustainable energy systems, transportation machinery, tribology and vibration. Selected by means of a rigorous international peer-review process, they highlight numerous exciting advances and ideas that will spur novel research directions and foster new multidisciplinary collaborations.

Development of a Generalized Mechanical Efficiency Prediction Methodology for Gear Pairs

Author : Hai Xu
Publisher :
ISBN 13 :
Total Pages : 233 pages
Book Rating : 4.:/5 (685 download)

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Book Synopsis Development of a Generalized Mechanical Efficiency Prediction Methodology for Gear Pairs by : Hai Xu

Download or read book Development of a Generalized Mechanical Efficiency Prediction Methodology for Gear Pairs written by Hai Xu and published by . This book was released on 2005 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this study, a general methodology is proposed for the prediction of friction-related mechanical efficiency losses of gear pairs. This methodology incorporates a gear contact analysis model and a friction coefficient model with a mechanical efficiency formulation to predict the gear mechanical efficiency under typical operating conditions. The friction coefficient model uses a new friction coefficient formula based on a non-Newtonian thermal elastohydrodynamic lubrication (EHL) model. This formula is obtained by performing a multiple linear regression analysis to the massive EHL predictions under various contact conditions. The new EHL-based friction coefficient formula is shown to agree well with measured traction data. Additional friction coefficient formulae are obtained for special contact conditions such as lubricant additives and coatings by applying the same regression technique to the actual traction data. These coefficient of friction formulae are combined with a contact analysis model and the mechanical efficiency formulation to compute instantaneous torque/power losses and the mechanical efficiency of a gear pair at a given position. This efficiency prediction methodology is applied to both parallel axis (spur and helical) and cross-axis (spiral bevel and hypoid) gears. In the case of hypoid gears, both face-milling and face-hobbing processes are considered, and closed-form expressions for the geometric and kinematic parameters required by the efficiency model are derived. The efficiency prediction model is validated by comparing the model predictions to a set of high-speed spur gear efficiency measurements covering several gear design and surface treatment variations. The differences between the predicted efficiency values and the measured ones are consistently within 0.1 percent. Influence of basic gear design parameters, tooth modifications, operating conditions, surface finish and treatments, lubricant properties, and manufacturing and assembly errors on mechanical efficiency of both parallel-axis and cross-axis gears are investigated. At the end, a set of guidelines is provided on how to improve mechanical efficiency of gear pairs through design, surface engineering and lubricant solutions.

Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722618063
Total Pages : 52 pages
Book Rating : 4.6/5 (18 download)

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Book Synopsis Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears by : National Aeronautics and Space Administration (NASA)

Download or read book Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Face-milled spiral bevel gears with uniform tooth height are considered. An approach is proposed for the design of low-noise and localized bearing contact of such gears. The approach is based on the mismatch of contacting surfaces and permits two types of bearing contact either directed longitudinally or across the surface to be obtained. Conditions to avoid undercutting were determined. A Tooth Contact Analysis (TCA) was developed. This analysis was used to determine the influence of misalignment on meshing and contact of the spiral bevel gears. A numerical example that illustrates the theory developed is provided. Litvin, F. L. and Wang, A. G. Glenn Research Center...

Computerized Design and Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gear Drives

Author : Faydor L. Litvin
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Computerized Design and Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gear Drives by : Faydor L. Litvin

Download or read book Computerized Design and Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gear Drives written by Faydor L. Litvin and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

User's Manual for Tooth Contact Analysis of Face-Milled Spiral Bevel Gears with Given Machine-Tool Settings

Author : National Aeronautics and Space Adm Nasa
Publisher :
ISBN 13 : 9781731233806
Total Pages : 80 pages
Book Rating : 4.2/5 (338 download)

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Book Synopsis User's Manual for Tooth Contact Analysis of Face-Milled Spiral Bevel Gears with Given Machine-Tool Settings by : National Aeronautics and Space Adm Nasa

Download or read book User's Manual for Tooth Contact Analysis of Face-Milled Spiral Bevel Gears with Given Machine-Tool Settings written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-12 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research was performed to develop a computer program that will: (1) simulate the meshing and bearing contact for face milled spiral beval gears with given machine tool settings; and (2) to obtain the output, some of the data is required for hydrodynamic analysis. It is assumed that the machine tool settings and the blank data will be taken from the Gleason summaries. The theoretical aspects of the program are based on 'Local Synthesis and Tooth Contact Analysis of Face Mill Milled Spiral Bevel Gears'. The difference between the computer programs developed herein and the other one is as follows: (1) the mean contact point of tooth surfaces for gears with given machine tool settings must be determined iteratively, while parameters (H and V) are changed (H represents displacement along the pinion axis, V represents the gear displacement that is perpendicular to the plane drawn through the axes of the pinion and the gear of their initial positions), this means that when V differs from zero, the axis of the pionion and the gear are crossed but not intersected; (2) in addition to the regular output data (transmission errors and bearing contact), the new computer program provides information about the contacting force for each contact point and the sliding and the so-called rolling velocity. The following topics are covered: (1) instructions for the users as to how to insert the input data; (2) explanations regarding the output data; (3) numerical example; and (4) listing of the program. Litvin, Faydor L. and Zhang, YI and Chen, Jui-Sheng Unspecified Center...

Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives

Author : F. L. Litvin
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives by : F. L. Litvin

Download or read book Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives written by F. L. Litvin and published by . This book was released on 1996 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781730849794
Total Pages : 84 pages
Book Rating : 4.8/5 (497 download)

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Book Synopsis Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives by : National Aeronautics and Space Adm Nasa

Download or read book Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-04 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method for design and generation of spiral bevel gears of uniform tooth depth with localized bearing contact and low level of transmission errors is considered. The main features of the proposed approach are as follows: (1) The localization of the bearing contact is achieved by the mismatch of the generating surfaces. The bearing contact may be provided in the longitudinal direction, or in the direction across the surface; and (2) The low level of transmission errors is achieved due to application of nonlinear relations between the motions of the gear and the gear head-cutter. Such relations may be provided by application of a CNC machine. The generation of the pinion is based on application of linear relations between the motions of the tool and the pinion being generated. The relations described above permit a parabolic function of transmission errors to be obtained that is able to absorb almost linear functions caused by errors of gear alignment. A computer code has been written for the meshing and contact of the spiral bevel gears with the proposed geometry. The effect of misalignment on the proposed geometry has also been determined. Numerical examples for illustration of the proposed theory have been provided. Litvin, F. L. and Zhao, X. Glenn Research Center...

Bevel Gear

Author : Jan Klingelnberg
Publisher : Springer
ISBN 13 : 3662438933
Total Pages : 358 pages
Book Rating : 4.6/5 (624 download)

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Book Synopsis Bevel Gear by : Jan Klingelnberg

Download or read book Bevel Gear written by Jan Klingelnberg and published by Springer. This book was released on 2016-03-25 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to offer a complete presentation of bevel gears. An expert team of authors highlights the areas of application for these machine elements and presents the geometrical features of bevel gears as well as the various gear cutting processes based on gear cutting theory. The aspect of three-dimensional gearing is assessed in detail in terms of flank design, load capacity and noise behavior. A representation of production processes with the required technologies provides a knowledge base on which sound decisions can be based. The authors offer a thorough introduction to the complex world of bevel gears and present the rapid advances of these machine elements in a detailed, comprehensible manner. This book addresses design engineers in mechanical engineering and vehicle manufacturing, as well as producers of bevel gears and students in mechanical engineering.

Local Synthesis and Tooth Contact Analysis of Face-milled Spiral Bevel Gears

Author : Faydor L. Litvin
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Local Synthesis and Tooth Contact Analysis of Face-milled Spiral Bevel Gears by : Faydor L. Litvin

Download or read book Local Synthesis and Tooth Contact Analysis of Face-milled Spiral Bevel Gears written by Faydor L. Litvin and published by . This book was released on 1991 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Testing of Face-Milled Spiral Bevel Gears at High-Speed and Load

Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Testing of Face-Milled Spiral Bevel Gears at High-Speed and Load by :

Download or read book Testing of Face-Milled Spiral Bevel Gears at High-Speed and Load written by and published by . This book was released on 2001 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spiral bevel gears are an important drive system components of rotorcraft (helicopters) currently in use. In this application the spiral bevel gears are required to transmit very high torque at high rotational speed. Available experimental data on the operational characteristics for thermal and structural behavior is relatively small in comparison to that found for parallel axis gears. An ongoing test program has been in place at NASA Glenn Research Center over the last ten years to investigate their operational behavior at operating conditions found in aerospace applications. This paper will summarize the results of the tests conducted on face-milled spiral bevel gears. The data from the pinion member (temperature and stress) were taken at conditions from slow-roll to 14400 rpm and up to 537 kW (720 hp). The results have shown that operating temperature is affected by the location of the lubricating jet with respect to the point it is injected and the operating conditions that are imposed. Also the stress measured from slow-roll to very high rotational speed, at various torque levels, indicated little dynamic affect over the rotational speeds tested.