Performance Analysis Of MC Nylon Helical Gear Based On The Finite Element Method

MC Nylon(i.e. the Monomers Casting Nylon) is featured with high strength, toughness, and the ability of sound-absorbing, wear-resisting, self-lubricating. It also has high impact and fatigue resistance, good contravariance and rebounding property, and the characterization of not binding other materials. With these various unique performance, it in some cases will be better to use MC nylon gears than metal gears.Compared with traditional metal gears, MC nylon gears have lower strength and elastic modulus, which restricts its application and development in industry. In order to make it better applied, the author conducts an analysis of the mechanical performance of MC nylon gears. The main contents are as follows:1. Giving a brief summary of the contemporary application and development of plastic gears in industry, and of the contemporary status and progress in the study of gears in the aspect of simulated analysis via the finite element contact method.2. Building a three-dimensional finite element model of inclined gear with its vice model by using the software SolidWorks with its plug-ins GearTrax, HyperMesh and ANSYS. This method of building a geometrical model first and then undertaking finite element calculation provides for the engineers and research workers a quick and efficient way to conduct the finite element simulation analysis.3. Conducting a model analysis of gears by making use of Block Lanczos method, then extracting the low frequencies and the corresponding main vibration and making a study of the intrinsic characteristics of the system. To reduce the gear vibration and noise and avoid gear transmission system resonance, the frequency of vibration force should be staggered from the inherent frequency of the system.4. Building a vice three-dimensional finite element model on the basis of setting up a single inclined gear, and then taking a computational experiment in which the engaging and driving process of the vice MC nylon helical gear was analysed through the adoption of the Full method in transient dynamics in ANSYS. Then came the result that the maximum stress which is 84.3MPa locates at the root, which meets for the intensity requirements of the load conditions. Also this paper got the results that the gear contact line turns out to be 1.33mm-wide and that the inclination angle of the contact line roughly equals the helical angle of the gear. For whether the vice gear is steady or not in the meshing process can be shown through calculating the figures of the width and gradient of the contact line, the two figures show that the inclined gear's meshing process is relatively steady. The dedendum stress spectrum was also obtained, which provides a basis for the computation of fatigue life of the gear.All these achievements are valuable for further-studying, improving and optimizing gears. In the end, this thesis makes an elaboration on the orientation of further study.