Non-circular gear
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Macro geometry optimization of a helical gear pair for mass, efficiency, and transmission error Open
When designing helical gears, the goal is to optimize gear weight, efficiency, and noise while simultaneously achieving the required strength. In this study, the macro geometry of a helical gear pair was optimized for low weight, high effi…
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An improved numerical method for the mesh stiffness calculation of spur gears with asymmetric teeth on dynamic load analysis Open
Gears are one of the most crucial parts of power transmission systems in various industrial applications. Recently, there emerged a need to design gear drivers due to the rising performance requirements of various power transmission applic…
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Design of Geometrical Parameters and Kinematical Characteristics of a Non-circular Gear Transmission for Given Parameters Open
In this paper, the authors present the design of a suitable gear transmission with the continuously changing gear ratio in the range from 0.5 through 1.0 to 2.0 and back during one revolution of intermeshing gears, according to demands spe…
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Vibration and noise characteristics of a gear reducer under different operation conditions Open
Gear system is characterized by high efficiency, compact structure, and transmission ratio stability, and it has been extensively applied in various industrial equipment. This paper presents a novel preliminary estimate method for gear red…
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Polymer gear contact fatigue reliability evaluation with small data set based on machine learning Open
Polymer gears have shown potential in power transmission by their comprehensive mechanical properties. One of the significant concerns with expanding their applications is the deficiency of reliability evaluation methods considering small …
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Surface integrity aspects in gear manufacturing Open
Gears are highly loaded components in many different application areas such as automotive, aircraft turbines, ships or wind energy systems. The demand on gears can be summarized by ever rising load capacity on the one hand side and signifi…
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Geometric design and kinematics analysis of coplanar double internal meshing non-circular planetary gear train Open
A new type of non-circular planetary gear train is proposed, in which the planetary gear is internally meshed with the sun gear and the ring gear at the same time. The structural form and transmission principle are analyzed, and the design…
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A New Structure for the Magnetic Gear Open
In this paper, a new structure for increasing the magnetic gear torque is proposed, which has high torque density and high mechanical properties. The permanent magnets (PMs) of the outer rotor are spoked and magnetized along the tangential…
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Design and analysis of composite spur gears using finite element method Open
In this study, the parametric design and contact analysis of composite spur gears are investigated numerically. Composite gear provides an adequate strength to weight ratio, more hardness, durability and low maintenance cost. It is emergin…
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Double-arc harmonic gear profile design and meshing analysis for multi-section conjugation Open
Harmonic gear with double-circular-arc tooth profile has great advantage in the meshing performance. However, only the single cross section meshing or the adjustment of the flexible gear structure is considered to design the conjugate prof…
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Quasi-Static and Dynamic Behaviors of Helical Gear System with Manufacturing Errors Open
Time-varying mesh stiffness (TVMS) and gear errors include short-term and long-term components are the two main internal dynamic excitations for gear transmission. The coupling relationship between the two factors is usually neglected in t…
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Experimental study of the effect of assembly error on the lightly loaded transmission error of spur gear with crown modification Open
Experimental measurement of transmission error and vibration of a gear pair with crown modification are developed. With the help of high-precision optical encoder, effects of gear misalignment on unloaded and lightly loaded dynamic transmi…
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Multi-Objective Optimization of Gear Ratios of a Seamless Three-Speed Automated Manual Transmission for Electric Vehicles Considering Shift Performance Open
Multi-speed transmission can greatly improve the power and economic performance of electric vehicles (EVs) compared with single-speed transmission. Gear ratio is the key design parameter of multi-speed transmission. Optimizing gear ratios …
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Geometry and design of spur gear drive associated with low sliding ratio Open
The relative sliding between tooth surfaces is the main cause of tooth wear and power loss, which directly affects the transmission efficiency and durability of gear. The aim of this paper is to provide a method to design such spur gear wi…
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Mathematical Modeling and Dynamic Analysis of Planetary Gears System with Time-Varying Parameters Open
Planetary gears are widely used in automobiles, helicopters, heavy machinery, etc., due to the high speed reductions in compact spaces; however, the gear fault and early damage induced by the vibration of planetary gears remains a key conc…
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Simulation and Experimental Verification of Die Quenching Deformation of Aviation Carburized Face Gear Open
The tooth width and length of face gear limit control the strength of face gear, and heat treatments are often used to improve the hardness and strength of face gear. However, heat treatments will often cause additional deformations, which…
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Dynamic analysis of spur gear with backlash using ADAMS Open
Gear tooth profile can deviate from its initial design shape and size as a result of increasing service time under time-varying load, introducing external agents like debris, overheating due to friction, wear, and in generally due to other…
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Development of Helical Teethed Involute Gear Meshed with a Multi-Edge Cutting Tool Using a Mixed Gear Teeth Modeling Method Open
Gearing studies, gear-manufacturing simulations or FEM analysis are nowadays performed mostly in virtual environment. Basically, studies in virtual environment require models, in present cases gear models. The reliability of the results of…
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Dynamic modeling of double-helical gear with Timoshenko beam theory and experiment verification Open
In the dynamic study of the double-helical gear transmission, the coupling shaft in the middle of the two helical gears is difficult to be handled accurately. In this article, the coupling shaft is treated as the Timoshenko beam elements a…
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Numerical and Experimental Investigations of Noise and Vibration Characteristics for a Dual-Motor Hybrid Electric Vehicle Open
This paper investigates the abnormal noise and vibration of a hybrid electric vehicle during the electric-only driving mode. The sources of the noise and vibration are first identified through the frequency analysis, and then several measu…
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Determination of optimum gear ratios of a three stage bevel helical gearbox Open
This paper presents a study on the determination of optimum gear ratios of a three stage bevel helical gearbox. In the study, for finding the optimum gear ratios, an optimization problem was conducted. In the optimization problem, the cros…
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Analysis of Load-Sharing Behavior of the Multistage Planetary Gear Train Used in Wind Generators: Effects of Random Wind Load Open
Load-sharing behavior is very important for power-split gearing systems. Taking the multistage planetary gear train transmission of an Million Watt (MW) wind generator as the investigation object, and based on the gear transmission system …
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A Virtual Measurement Method of the Transmission Error Based on Point Clouds of the Gear Open
As the most widely used gear measuring instrument, the gear measuring center can measure the individual deviations of a gear tooth flank other than the comprehensive deviations of the gear. However, gear transmission error is an important …
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Design of a Noncircular Planetary Gear Mechanism for Hydraulic Motor Open
Given the design difficulty and poor accuracy of tooth profile of noncircular gear used in noncircular gear hydraulic motor, it is proposed to reduce the design difficulty and improve the design accuracy by using arc-shaped pitch curve ins…
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Face-gear drive: Simulation of shaping as manufacturing process of face-gears Open
Gear shaping is the most important process for manufacturing internal gears. Even if this method is also suitable for the production of spur gears, these can be produced more effectively using hobbing. Gear shaping is also interesting for …
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Dynamic Responses of the Planetary Gear Mechanism Considering Dynamic Wear Effects Open
Gear wear is unavoidable and results in vibrations and decreased performance in a planetary gear system. In this work, the wear phenomenon of the gear teeth surface and the dynamic responses of the planetary gear mechanism are investigated…
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Experiments and finite element analysis on a hybrid polymer gear rack Open
This article presents the results of experiments and finite element analysis on a hybrid polymer gear concept. The study aimed to investigate the effectiveness of the hybrid gear concept by using a rack tooth geometry. The results of the e…
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The Effects of the Planet–Gear Manufacturing Eccentric Errors on the Dynamic Properties for Herringbone Planetary Gears Open
In the presence of manufacturing errors, the dynamic properties of herringbone planetary gear train (HPGT) can be altered from the originally designed properties to have undesired behavior. In this paper, by considering the herringbone gea…
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Life Distribution Transformation Model of Planetary Gear System Open
Planetary gear systems have been widely used in transportation, construction, metallurgy, petroleum, aviation and other industrial fields. Under the same condition of power transmission, they have a more compact structure than ordinary gea…
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Dynamical processes in a multi-motor gear drive of heavy slabbing mill Open
A real case study is represented of abrupt failures in a new multi-motor gear drive of vertical rolls in the heavy slabbing mill. Modal analysis is conducted, and the lowest torsional vibration modes are verified by the data from an indust…