|
Abstract:
Open gear is key driving device of hydraulic power tongs, and bearing the rotating loads from two idlers. When unscrewing and screwing, there is only a single idler meshes with open gear and the stress focuses in the contact areas which having a bad influence on the quality of makeup and breakout and the operating life of the hydraulic power tongs. In order to learn the effect of the gear pair of single idler - open gear on high torque. Building the three-dimensional model of the gear pair by the software Pro/E, then simulated the condition of single idler meshes with open gear and double idlers mesh with open gear. The results show that the multiple stress of the condition of single idler working is higher than double and the multiple stress increment of single idler and open gear are 17.7% and 87.8%.The gear pair of single idler - open gear on high torque will reducing stiffness and working life of the open gear easily. It is necessary to avoid to working in such condition. And measures should be taken to decrease the stress concentrative, such as: increase the radius of gear root arc and make the tooth surface load sharing homogeneous along the axis.
|
