| Fracturing requirement’s requirement of present domestic oilfield fracturing and coal-bed methane development is large power, high discharge pressure, large capacity, which makes the transmission system can adapt to the condition with heavy load. As one of the key component of oil field fracturing, Heavy load gear box’s construction, performance, adaptability and the service life related to the level oil production. Herringbone gear has advantage of its high contact ratio and small axial load and high load carrying capacity, it is the best choice for heavy load gearbox.The thesis take the herringbone planetary gear sets which designed by petroleum equipment as the object of study, and considering a variety of internal excitation and external excitation, the coupled dynamic model of herringbone planetary gear sets is built. The static and dynamic load sharing behavior of the transmission system are obtained by using numerical methods, and the calculation results are verified by ADAMS; and tooth modification effect on load sharing behavior is analyzed. This dissertation’s main work is as follow:① Based on the method of gear system dynamics and Lagrange equation, A translational-rotational coupling dynamic model of the herringbone planetary gear sets is built, and gear train elastic coupling, the meshing stiffness excitation, meshing error excitation and external load are considered, herringbone gear is treated as two helical gears in the model.② Static load sharing calculation model of transmission system is built, and the static load sharing coefficient of transmission system is obtained, the impact of load and tooth flexible and center member floating on the load sharing characteristic is analyzed, load sharing coefficient of each the pin hole position error configuration are compared, and its causes are analyzed.③ Dynamics differential equation of the herringbone planetary gear sets are calculated by numerical analysis method, the impact of stagger angle and coupling torsional stiffness between the left and right helical gear on the load sharing characteristic is analyzed, and load sharing coefficient of each the pin hole position error configuration are compared, the calculation results are verified by ADAMS.④ The tooth modification parameters are determined through calculation, the influence of modification on several important dynamics index which include internal motivation and dynamic meshing force are analyzed, and then the effect of tooth modification on load sharing characteristics is obtained. |
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