An Numerical Analysis Of Gear Tooth Contact & Stress Distribution Of Marine Gearbox

Marine gear reducer is a class of machinery widely used on the ship, There is its presence in the governor shaft, diesel fuel injection system and the anchor machine. Therefore, the failure of gear will bring immeasurable impact to the ship work, the failure of the main form of marine gear contain pitting, bonding, wear, when break occurs in rare cases, in addition, reducing vibration and noise also become the goal by the people. In order to increase the service life of gears and improve its performance, it will have on the work gear contact and stress distribution in the study the issue, including issues of access you have to study gear lubrication, gear of stress intensity distribution must be studied, this paper is carried out from the two perspectives.Taking marine a single-stage spur gear for the study, the paper introduce the EHL theory, calculate the contact of the gear lubricant parameters, analysis the contact stress of gears using the strength theory, to guide the emergence of improper contact with failure in gear lubrication, the main contents of the paper can be summarized as follows:This paper summarizes the application and failure of marine gear failure, analyses the failure factors and figures out that the main causes of the failure is poor contact of lubrication.Motion model and force model are established. Then, the lubrication parameter of marine gear is calculated by using the elastic-hydrodynamic lubrication theory and tooth surface strength is analyzed by elasticity combining with mathematical algorithms.At last, finite element analysis software ANSYS input the gear diagram which is created by three-dimensional modeling software to obtain concise results of three-dimensional stress.The results of numerical computation show:when the calculation region node is increased, the calculation speed will slow down; oil film pressure appears obvious secondary pressure peak; stable oil film mesh can format in mesh point; the double single alternate mesh point force is worst in line of action; the strength from lubrication results is smaller than from Hertz contact; and the simulation calculation results consistent with the numerical computation results.