Research on the Longitudinal Modification of Involute Spur Cylindrical Gear Pair with Axial Angle Errors Used in Timing Drive System of Automobile

2012 ◽  
pp. 2221-2225
Author(s):  
Yangang Wei ◽  
Kueide Quan
Keyword(s):  
Drive System ◽  
Gear Pair ◽  
Cylindrical Gear ◽  
Axial Angle ◽  
Timing Drive

Research on Mathematical Modeling and Kinematic Simulation of Elliptic Family Gears

2013 ◽  
Vol 579-580 ◽  
pp. 300-304 ◽  
Author(s):  
Lian Xia ◽  
Da Zhu Li ◽  
Jiang Han
Keyword(s):  
Performance Analysis ◽  
Tooth Profile ◽  
High Order ◽  
Numerical Control ◽  
Gear Pair ◽  
Cylindrical Gear ◽  
Kinematic Simulation ◽  
Cad Modeling ◽  
Pure Rolling ◽  
Pitch Curve

Elliptic family gears are commonly used in non-circular gears, which include elliptic gear, high-order gear, elliptic deformed gear and high-order deformed gear, thereinto high-order deformed gear can include the elliptic family gears through adjust its order and deformed coefficient. Because non-circular gear has different tooth profile in different position of pitch curve and there is difference in the left and right tooth profile of the same gear tooth, thus the CAD modeling of non-circular gear is difficult for these characteristics; but the precise model of non-circular gear has important significance to the realization of numerical control machining, kinematic simulation and relevant mechanical analysis. This paper deduce the corresponding pure rolling mathematical model based on the pure rolling contact theory that cylindrical gear and non-circular gear mesh in the end face, and realize the CAD modeling of non-circular straight and helical gears by letting the cylindrical gear and non-circular gear make solid geometry operation, which is suitable for pitch curve with convex and concave. The non-circular gear shaping methods with equal polar and equal arc length are simulated by setting different discrete polar angles, and the transmission ratio curve and the angular acceleration curve of driven gear are get through the kinematic simulation of gear pair, which realize the transmission performance analysis of elliptic family gear pair. The above research results can be applied to the modeling and kinematic performance analysis of other non-circular gears.

Study on the compound transmission mechanism of the curve-face gear based on screw theory

2017 ◽  
Vol 232 (17) ◽  
pp. 3115-3124 ◽  
Author(s):  
Chao Lin ◽  
Yanqun Wei ◽  
Zhiqin Cai
Keyword(s):  
Screw Theory ◽  
Transmission Mechanism ◽  
Tooth Surface ◽  
Design Parameters ◽  
Gear Pair ◽  
Face Gear ◽  
Cylindrical Gear ◽  
Cam Mechanism ◽  
Conjugate Surfaces ◽  
Curve Face

The compound transmission mechanism of curve-face gear is a new type of gear transmission based on the cam mechanism and the curve-face gear pair. It combines the transmission characteristics of the cam mechanism and noncircular bevel gear. When the compound transmission mechanism of curve-face gear is engaged in the meshing transmission, the rotating center of the cylindrical gear is fixed and used as the driving wheel, and the curve-face gear can generate the helical motion around the axis. In this paper, the meshing characteristics and motion laws of the compound transmission mechanism of the curve-face gear are studied based on the theory of screw. Based on the meshing theory of gears, the coordinate system of conjugate surfaces is established, the basic meshing theory and equation are obtained. On this basis, combined with the principle of the cam, the transmission principle is analyzed by the screw theory. The tooth surface equation of the compound transmission mechanism of curve-face gear is deduced based on the meshing theory and the related knowledge of geometry. The motion law of the curve-face gear and the change of the motion law with the change of the basic parameters of the gear pair with different design parameters are calculated and analyzed. An experimental platform is built to verify the law of motion, and the experimental results are compared with the theoretical values. The correctness of the theoretical analysis is verified, which provides a new way for the research of the compound transmission mechanism of the curve-face gear.

scholarly journals Comparison between the AFNOR Method and the Imposition of Balanced Maximum Specific Sliding in the Imposed Centre Distance Problem

2018 ◽  
Vol 3 (3) ◽  
pp. 17-26
Author(s):  
Pedro Freitas ◽  
António Francisco Tenreiro ◽  
Paulo M. S. T. De Castro
Keyword(s):  
Gear Pair ◽  
Auxiliary Parameter ◽  
Rigorous Analysis ◽  
Cylindrical Gear ◽  
Distance Problem ◽  
Approximate Procedure ◽  
Specific Sliding ◽  
Center Distance

Successive editions of Henriot’s treatise on gears, and an AFNOR document, present an approximate procedure for the choice of profile shift values for the pinion and wheel when a center distance value is imposed in a cylindrical gear pair. That procedure aims at achieving an approximate balancing of the maximum specific sliding values of the pinion and of the wheel. The method involves a loosely defined choice of an auxiliary parameter, but no information is available relating this choice with the level of attainment of the intended balancing of maximum specific sliding values. This assessment, if needed, requires a subsequent analysis for verification.Since no information is available evaluating the procedure, the purpose of this work is to provide a thorough rigorous analysis of the method, highlighting its qualities but also its shortcomings.

Recent Progress and Prospect on Tooth Modification of Involute Cylindrical Gear

2021 ◽  
Vol 14 ◽  
Author(s):  
Lin Han ◽  
Yang Qi
Keyword(s):  
Load Distribution ◽  
Power Transmission ◽  
Gear Tooth ◽  
Transmission Error ◽  
Gear Pair ◽  
Cylindrical Gear ◽  
Tooth Width ◽  
Modification Method ◽  
Power Transmission Systems ◽  
Tooth Modification

Background: Recent reviews on tooth modification of involute cylindrical gear are presented. Gear pairs are widely employed in motion and power transmission systems. Manufacturing and assembling errors of gear parts, time-varying mesh stiffness and transmission error of gear pair, usually induce vibration, noise, non-uniformly load distribution and stress concentration, resulting in earlier failure of gear. Tooth modification is regarded as one of the most popular ways to suppress vibration, reduce noise level, and improve load distribution of gear pairs. Objective: To provide an overview of recent research and patents on tooth modification method and technology. Methods: This article reviews related research and patents on tooth modification. The modification method, evaluation, optimization and machining technology are introduced. Results: Three types of modifications are compared and analyzed, and influences of each on both static and dynamic performances of gear pair are concluded. By summarizing a number of patents and research about tooth modification of cylindrical gears, the current and future development of research and patent are also discussed. Conclusion: Tooth modification is classified into tip or root relief along tooth profile, lead crown modification along tooth width and compound modification. Each could be applied in different ways. In view of design, optimization under given working condition to get optimal modification parameters is more practical. Machining technology and device for modified gear is a key to get high quality performance of geared transmission. More patents on tooth modification should be invented in future.

Research on Contact Fatigue of Cylindrical Gear

2011 ◽  
Vol 415-417 ◽  
pp. 879-882
Author(s):  
Xue Yi Li ◽  
San Shuai Li ◽  
Da Qian Geng ◽  
Qing Liang Zeng
Keyword(s):  
Contact Stress ◽  
Dynamic Balance ◽  
Influence Factors ◽  
Contact Fatigue ◽  
Fatigue Properties ◽  
Gear Pair ◽  
Transient Dynamic Analysis ◽  
Element Analysis ◽  
Cylindrical Gear ◽  
Balance Principle

Based on the dynamic balance principle and contact fatigue properties of cylindrical gear pair, the influence factors of dynamics are researched and the meshing location for the maximum contact stress is accurately determined. Loading spectrum of contact stress is obtained by transient dynamic analysis. At the same time, the corresponding S-N curve for contact fatigue is described in a double logarithmic coordinate system. Then the finite element analysis on the contact fatigue life is carried out by ANSYS Workbench and safety factor for both gears are obtained. It has great significance for evaluating the reliability of the cylindrical gear pair.

Profile Modification of Involute Spur Cylindrical Gear Pair Used in Timing Transmission System of Automobile and its Dynamic Simulation

2013 ◽  
Vol 568 ◽  
pp. 123-127 ◽  
Author(s):  
Yan Gang Wei ◽  
Yang Yang ◽  
Ta Jin Lin ◽  
Ming Cheng Gao
Keyword(s):  
Transmission System ◽  
Gear Pair ◽  
Analysis Software ◽  
Dynamic Simulations ◽  
Cylindrical Gear ◽  
Work Condition ◽  
Profile Modification ◽  
Straight Line ◽  
Fea Simulation ◽  
Simulation Results

According to the FEA simulation results of tooth deformations in the mesh process, the profile modification of the involute spur cylindrical gear pairs used in timing transmission system of an automobile are designed based on the methods and theories proposed by domestic and oversea scholars and experts. The dynamic simulations of the gear pairs with straight line modification profile and involute modification profile under different values of modification amounts are done using dynamic analysis software ADAMS. Then it is testified by simulation results that (i)the mesh impact between the gear pairs with involute correction profile is obviously smaller than those between the gear pairs with straight line correction profile and without correction, (ii) optimized value of modification amounts of the gear pairs with involute correction profile is different that of the gear pairs with straight line correction profile under the same work condition.

scholarly journals Tooth bending stress analysis of high speed curve face gear of composite transmission

2021 ◽  
Vol 22 ◽  
pp. 20
Author(s):  
Yongquan Yu ◽  
Chao Lin ◽  
Yanan Hu
Keyword(s):  
High Speed ◽  
Normal Load ◽  
Engineering Application ◽  
Tooth Surface ◽  
Gear Pair ◽  
Bending Stress ◽  
Contact Ratio ◽  
Face Gear ◽  
Cylindrical Gear ◽  
Curve Face

To promote the engineering application of composite transmission of high speed curve face gear, which consists of a cylindrical gear and a high speed curve face gear, the analysis of tooth bending stress should be taken into consideration. High speed curve face gear pair is a new type of curve face gear pair. Combined with the principle of high speed cam and curve face gear pair transmission, it can transfer the axial/rotation composite motion and power between two intersecting shafts. Based on the gear engagement principle, the gear meshing coordinate system was established and the fundamental of the high speed composite transmission was expounded. Combined with the tooth profile equation of generating gear, the tooth surface equation of high speed curve face gear was gained. Tooth force, contact ratio and normal load distribution were calculated. Then the tooth bending stress of high speed curve face gear during the transmission was calculated and analyzed in detail. Influence of basic parameters on tooth bending stress was discussed. Finally, the simulation and measurement experiment of tooth bending stress was carried out. By the comparison analysis of simulation, experiment and theory, the correctness of tooth bending stress calculation method was verified, which has important guiding significance for the further research of high speed curve face gear of composite transmission.

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