Design And Optimation Study Of Pinion And Rack In The Installstion Vessel Jacking Systems

Supper-modulus gear is used more and more in great engineering projects, and the module of gear is continuously augmented. For example, the module of gear of gear of the offshore drilling platform already achieves135mm. In the Standard of Country GB3480-1997, the maximum of module is50mm. Nowdays whereas for supper-module gear which module is more than50mm, there is lack of mature design theory and thrength calculating theory.The subject takes support project of science and technology plan in Jiangsu Province-"research and development of offshore wind power lifting and special transport ship" as the background. Researching design method for supper-modulus gear, and designing a safety and reliable mechanism of supper-modulus gear for the ship. On the base, deeply researching supper-modulus gear contact thrength and bend thrength by finite element method and doing optimization of rack and pinion strength. The main contents of this theisi are listed as:1. According to gear meshing theory, studying designing theory of supper-modulus rack and pinion. Studying design method of pinion, which is used for any modulus, pressure angle and other parameters pinion, by similarity theory and finite element. Establishing modulus and pitch circle calculation model of supper-modulus pinion, and calculating compound profile coefficient YZ by finite element.2. Anaylzing different actual working condition of wind power installation vessel and caculating external load of mechanism of rack and pinion, wich is under the most dangerous operating condition (preloading condition).According to parameters and designing requriement of the wind power installation vessel, designing a safty and ralibale mechanism of rack and pinion for it, by supper-modulus gear design mothed which has been studied.3. Based on C#and secondary development of SolidWorks, developing a set of accurate parametric modeling program of involute spur gears and building3D model of rack and pinion. Doing contact analysis of rack and pinion by finite element method, and studying laws of contact stress and bending stress in engagement cycle.4. Studying laws which pinion profile shiftx, pressure angle α, addendum coefficient ha, tooth gap coefficient c*, tooth fillet coefficient ρ*f, module m and width of rack affect contact strength and bending strength of rack and pinion. On the base of which, optimizing the mechanism of rack and pinion, to improve contactstrength and bending strength of rack and pinion. Analysis of laws show that eachparameter has large influence on the capacity of the rack and pinion, but the degreesof influence are different.