Study on Induction Tempering Technology of Escalator Change Gear by Peijie Chen, Guoqing Zeng, Zhengzeng Pan, Xiaopeng Dou, Yongzhi Li

“…Compared to the single-pass induction tempering， the hardness distribution at the surface and root of the tooth was more uniform. Besides， multi-pass induction tempering could obviously improve the hardness uniformity， form fine tempered martensite structure and compressive residual stress at the tooth surface， which would help improve the toughness and fatigue strength of the gear. …”
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Gear Modification Design Considering Axis Parallelism Deviation and Thermal Deformation by Yang Xinru, Lin Tengjiao, He Zeyin

“…Taking the involute spur gear pair as the research object,the tooth surface convection heat transfer equation is obtained based on the improved friction heat spread by centrifugal ejection model,the tooth surface heat flow equation is obtained based on finite element method and friction heat analysis,on this basis,the gear pair bulk temperature is analyzed considering axis parallelism deviation. …”
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RESEARCH OF THE COLD-BEATING GEAR HARDNESS ON THE BASIS OF MICROSTRUCTURE by LI YuXi, LI Yan, CUI LiMu, XIAO JiMing, CHEN YuZhao

“…The gear processed by traditional technology has a lower tooth surface hardness because of the cut metal fibre. …”
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MANAGEMENT OF USING SALINE IRRIGATION WATER AND TILLAGE SYSTEMS ON THE SOIL MECHANICAL AND HYDRAULIC by Shaima S. Dawod, Alaa S. Ati, Inas A. Abdujabbar

“…Tillage with Chisel Plow and Spring Tooth Harrows c. Tillage with Mold Plow and Spring Tooth Harrows. …”
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Study on Contact Force and Transmission Accuracy of Cycloidal Wheel with Exponential Modification by Chen Xinwen, Zhu Min, Wang Qiliang

“…RV reducer plays a dominant role in the field of robots because of its advantages of high accuracy，high efficiency and small size.Cycloid wheel，as the key component of RV reducer，directly affects the performance of the transmission system of RV reducer.In order to improve the meshing performance of cycloidal pin wheel，the radius of needle teeth is constructed as an exponential function of the rotation angle for modification，and the profile equation after modification is established.The tooth profile curve and curvature radius of cycloidal wheel before and after modification are compared with examples.The contact pressure and transmission error between cycloid wheel and pin teeth are calculated when the crank rotates from 0°~360°.The exponential function modification maintains the theoretical tooth profile curve in the working section of cycloidal gear，overcomes the problem of large modification amount in traditional modification method，ensures the meshing stability，and improves the strength and transmission accuracy of cycloidal wheel.…”
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Research of Mechanical Property of Trochoid Roller Pinion Rack Transmissions by Zhang Yun, Zhang Peng, Bao Bingbing

“…Through the finite element simulation of the meshing process of roller and trochoid tooth,the rationality of the mechanics modeling method and the analysis results of the meshing pair are verified.…”
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Endodontic Treatment of Fused Teeth with Talon Cusp by Shima Sadat Miri, Hakimeh Ghorbani, Anousheh Rashed Mohassel

“…Tooth anomalies are rare phenomena that may be reported by patients as chief complaints or may be discovered by dentists in the oral examination. …”
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Study on the Coupling of Gear Dynamics and Elastohydrodynamic Lubrication by Jian Guangxiao, Wang Youqiang, Luo Heng, Li Yunkai

“…There is greater impact on the entry point， single-tooth entry point and single-tooth exit point which are the dangerous points of elastohydrodynamic lubrication.…”
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BASED ON MATLAB AND EXCEL PROGRAMMING AND DEVELOPMENT THE NEW METHOD OF HEADING MACHINE CUTTING HEAD by ZHAO LiJuan, BAO WenJie, MA Qiang, ZHAO MingYang, LIU XuNan

“…In the engineering objects of type EBZ220 machine for cutting head shape,leaf Numbers,and cutter tooth arrangement design and select the optimal scheme,the universality and simplicity of the software…”
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Restorations of Endodontically Treated Teeth by Hale Cimilli, Şevval Sena Ak

“…Restorations in endodontically treated teeth are applied considering the remaining tooth structure and functional status. For many years, post core systems that require additional preparation in the root canal, as well as the loss of most of the coronal tooth structures, are used for the final restoration of endodontically treated teeth. …”
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Simulation of Asynchronous Starting of Converter Tilting Mechanism Reducer based on LS-DYNA and Hyper Mesh by Ren Xueping, Yang Songtao

“…Aiming at the brakes open out of sync phenomenon of 210 t converter tilting mechanism in a steel plant,to study the influence of contact-impact on the gear strength under this working condition,the geometry entity model of the reducer is set up in Pro / E,and it is imported into the software of Hyper Mesh to built the finite element solving model,and the solving is carried out by using the explicit dynamics solver LS-DYNA.According to the results,a conclusion can be drawn that the impact stress of the pinion starting later is far less than that of three other pinions,when the gears contact without clearance and brakes open out of sync.At the same time,the result verifies the conclusion that the gear contact impact stress increases with increasing of the velocity difference between the gears and the maximum impact stress of gear occurs in tooth root in the middle of tooth width.…”
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Numercial Calculation of Time-varying Meshing Stiffness of Spur Gear based on Weber Energy Method by Yang Changhui, Xu Taojin, Xu Hongbin, Wang Zhiqiang, Liang Juke, Li Bingqian

“…Based on the Weber energy method,the numerical integral calculation formula of timevarying meshing stiffness for spur gear is derived.The meshing points are obtained by using the method of variable increment and infinite approximation method.By using this method,the meshing points location of the gear after tooth profile modification can be easily obtained.It is convenient for the study of the tooth profile modification.And by changing the value of the increment,the accuracy errors of the position of the meshing points can be controlled within 10-4 mm.And some MATLAB programs are written to calculate the time-varying meshing stiffness of the first stage planetary spur gear of a high-power wind turbine gearbox,thus it will lay the foundation for the subsequent dynamics analysis of wind turbine gearbox.…”
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Simulation of Wear in Involute Micro Gear by Shi Wankai, Wang Xu, Han Zhenhua, Liu Yin

“…In order to further study the microscopic wear mechanisms of micro gear,by using the classical Archard wear equation,combining with JKR（Johnson K L,Kendall K,Roberts A D） theory and GW（Greenwood and Williamson） rough surface model,a simulation model of the wear in micro gear is firstly established and the measures to reduce tooth wear are proposed.The simulation with considering the influence of single factor and multiple factor of surface attractive forces,surface roughness,the radius of curvature in asperity apex,material property etc.on tooth surface wear is carried out.The results show that an appropriate increasing in the surface roughness,reducing the radius of curvature in asperity apex,selecting the gear with larger parameter product value ηβσ which describing the rough surface,choosing the material which has a larger elastic modulus can alleviate wear and extend wear life.…”
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Optimization Design of Gear Parameter of a Tri-polar Parallel Gear Pump by Wang Shuangzhen

“…The optimization design of a tri-polar parallel gear pump is carried out by taking the minimum volume of the pump body as the objective function.In the mathematical model,the gear parameters such as modulus,tooth numbers,and thickness are taken as design variables,and the constraint condition is that the tri-polar parallel gear pump can meet the prescribed performance requirements.In the objective function,the volume of pump is replaced by the total volume of 4 mounting holes of addendum circles,which accurately reflects the volume of pump.In the process of solving optimization mathematical model,a new three-dimensional step-by-step search algorithm is proposed according to the characteristic that the formula of the objective function is very complex and the modulus,tooth numbers of gears are discrete variables.Thus an optimization algorithm for the tri-polar parallel gear pump designing is provided,and through an example,the feasibility and effectiveness of the algorithm are verified.…”
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Analysis and Research on NVH Problem of Double Clutch Transmission by Zhou Xinjian, Mao Le, Bao Guangzhen

“…Through the verification of the machining process of tooth to crossover,it is confirmed that the center hole of the input shaft head is not concentric with the A datum,which is the root cause of the gear direction helix angle error. …”
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STRENGTH TEST AND RELIABILITY EVALUATION OF 20CRNIMO MATERIAL (MT) by GUO YuLiang, WEI BingYang, GU DeWan, WANG YongQiang, CAO XueMei

“…After surface nitriding, carburizing or carbonitriding quenching treatment, it has good tooth surface hardness and tooth root toughness. …”
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Analysis and Dynamic Load Characteristic Modeling of RV Reducer by Liu Xueao, Xu Honghai

“…The results show that with the number of cycloidal gear tooth,the short amplitude coefficient and the pin gear center distribution circle radius increase,the meshing force decreases. …”
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Reverse Determination of Face-milling Cutter Radius of Curvilinear Cylindrical Gears Using Contact Pattern by Zhang Xuegang, Dong Yingjie

“…Firstly, the mathematical model of the tooth surface of the curvilinear cylindrical gear was introduced. …”
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Study on the Effect of Water Pollution in Lubricant on Gear Thermal Elastohydrodynamic Lubrication Characteristic by Yan Chen, Xian Zhang, Guosheng Li

“…Appropriate increase of water content can improve the lubrication characteristics of tooth surface，but considering oil film temperature rise and corrosion wear of equipment，the water content should be controlled within 5%.…”
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A Rare Case of Orthograde Retrieval of Extruded Instrument following Periapical Tissue Healing by Ahmed Elhakim, Tarek Mohamed Abd El-Wahab

“…The ideal retrieval protocol of separated instruments reverts the case to the initial situation prior to the fracture incidence while preserving the tooth hard tissue and the integrity of the supporting structures. …”
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