1.前言近来,船用齿轮的发展趋势是以降低成本,提高疲劳强度为目的,用渗碳淬硬的齿轮代替以往的调质钢齿轮。在表面硬度大的渗碳齿轮中,影响齿轮损坏的齿根弯曲疲劳强度比受点蚀断痕等影响的齿面强度更为重要。 1. Introduction Recently, the development trend of marine gear is to reduce costs and improve fatigue strength for the purpose, with hardened carburized gear to replace the previous quenched and tempered steel gear. In the carburized gear with large surface hardness, the tooth root bending fatigue strength which affects the gear damage is more important than the tooth surface strength which is affected by the pitting marks and the like.