某近海供应船齿轮箱PTO轴断裂分析及改进

Fracture analysis and improvement of PTO shaft on marine gearbox for an offshore supply vessel

针对某近海供应船齿轮箱在运行过程中发生PTO轴断裂这一问题,通过建立力学模型并结合测量技术和金相分析技术,对由于校中不好而引起高弹性联轴器损坏的情况下的PTO轴进行了分析,找出了各种可能造成PTO轴损坏的原因;在对PTO轴进行受力分析的基础上,着重研究了当高弹性联轴器成为悬臂负载时PTO轴的受力状况,分析了最薄弱处的二向应力状态,提出了提高PTO轴强度的几种措施。研究结果表明,针对高弹性联轴器的安装精度对船用齿轮箱PTO轴的强度影响,所提出的改进措施能够消除断轴事件的再次发生,保证设备的正常运行。

Aiming that PTO shafts fracture occurring during operation of a marine gearbox on an offshore supply vessel,in the case of the high flexible coupling is damaged because of the bad alignment of the high flexible coupling, through making mechanical model together with measuring technique and material metallographic analysis, all possible causes resulting to the fracture were found out. On the basis of mechanics analysis of the PTO shaft, stress condition of the sink groove of the PTO shaft were studied mainly and the two dimensional stress state of the weakest point was analyzed, when the high flexible coupling became cantilever load. Then, several precautions of improving strength of the PTO shaft were raised. The research result proves that, the strength of the PTO shaft is affected quite by installation accuracy of the high flexible coupling, and the improvement actions presented can eliminate the broken shaft event from happening again, ensure the normal operation of equipment.