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Study on the Modification and Dynamic Contact Characteristics of Involute Cylindrical Gears

Author: SunJianGuo
Tutor: LinTengZuo
School: Chongqing University
Course: Mechanical Design and Theory
Keywords: Gear Analysis of thermoelastically coupling Gear modification Impact simulation Finite Element Method
CLC: TH132.41
Type: Master's thesis
Year: 2008
Downloads: 682
Quote: 4
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Abstract


Gear has the characteristics of high transmission efficiency, constant power, widely used in many fields such as machinery, electronics, chemical industry, metallurgy, transportation. With the rapid development of modern industrial technology, vibration and noise reduction gear put forward higher requirements. Analysis of thermoelastic contact through the gears, gear modification, the impact of dynamic simulation has become high-performance gear designed to improve the dynamic performance of the gear. Thesis topic from the national scientific and technological support projects and the Natural Science Foundation of Chongqing. Combination of gear engagement theory, heat transfer, contact mechanics, structural dynamics the thermoelastic deformation analysis and engagement Impact Behavior during operation of the gear pair. The research work of this paper is as follows: (1) use of the Principles of Gear kinematics law, involute gear tooth profile equation is derived contact finite element modeling and different geometric parameters of involute gear pair. (2) based on Hertz contact theory, analysis of the variation of the gear pair tooth contact pressure; during operation of the gear pair contact finite element analysis using ANSYS software, draw a tooth contact force, contact deformation and meshing stiffness changes law. ③ analysis of the main gear meshing process, passive sprocket relative sliding velocity, calculate the the tooth boundary convective heat transfer coefficient and the tooth surface friction heat flow model analysis and multi-tooth gear body temperature field; temperature field displacement and stress field coupling analysis, calculate the gear pair the thermoelastic deformation draw than cold gear Vice thermoelastic deformation amount deformation slightly larger amount is slightly smaller, the contact stress colder state. (4) based on the finite element analysis of the tooth contact tooth modification, has been the position of the gear pair without considering temperature impact and considering temperature effects Modification Curve; using ANSYS software on biting, gnawing when standard involute the line gear pair and modification gear Vice contact tooth contact stress significantly reduced after the modification. And ⑤ established standard involute gear modification gear dynamic contact finite element analysis model using ANSYS / LS-DYNA software simulation, meshing process gear Vice dynamic contact force and dynamic stress variation, modification of gear contact characteristics are significantly improved. ⑥ the gears the thermoelastic contact analysis and the power developed by Visual Basic and ANSYS / APDL language contact finite element analysis program; able to establish any modulus, the coefficient of the number of teeth, helix angle and displacement gear pair finite element model; easy means secondary development of ANSYS software gear Vice static contact and power contact and the gear body temperature field analysis.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Gears and gearing
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