| Gear is a kind of basic part which is used in a wide range as the most important sparepart in the transmission system. It has become the symbol of industry in other ways. Largemodule gear is used more and more in great engineering projects, and the module of gear iscontinuously augmented, for example, the module of gear of the offshore drilling platformalready achieves 135mm. Whereas it is an important precondition to assure the security oftransmission to calculate the bending stress of tooth of the large module gear. However, theresearch on the bending strength of large module gear tooth root is scarce until now.Therefore, it is significant to investigate the stress of engaging tooth of large module gearprecisely.After introducing research & development and basis theory of contact problems,theoretical analysis of finite element numerical solution method is made for contact problemsof large module involutes cylindrical spur gear. A comparatively accurate 3D model of toothis confirmed by applying for three-dimensional solid and contact elements, aiming at its largeloading, the complicated situation and bad lubrication. Finite element model built in the paperis fit for objective practice, with flexible—flexible contact bodies and surfaces—surfacescontact mode. In term of that, the solution is achieved by ANSYS software.The model of gear is established by the parameterized function of ANSYS and thedetailed contact operation is illustrated. Rack and gear's contacting of elevating systems formobile self-elevating offshore platforms are analyzed by ANSYS software with finite elementnumerical solution method. The gear's bending stress and contact stress is computed too andis compared with the bending stress computed by GB33480—83 involutes cylindrical spur gearcarrying capacity method. So the material is verified and logical suggestion is proposed.
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