当船舶在波浪中航行时，由于受到水浮力、水阻力、船舶重力及惯性力等作用，船体会产生中拱或中垂变形。研究表明，船体的这种变形会导致沿船体纵向布置的齿轮机构的轴承支座中心距产生变化，中心距的改变影响到轮齿的啮合传动，并最终对齿轮的寿命产生影响。另外，已有的研究也表明，齿间摩擦对齿轮强度的影响不可轻视。针对传统的船用齿轮在强度计算中不计船体变形及齿间摩擦力的问题，以沿船体纵向布置的渐开线斜齿减速齿轮机构中主动轮为研究对象，通过系统地分析、研究，推导出综合考虑船体变形及齿间摩擦的齿根弯曲疲劳强度优化计算公式。算例表明．船体变形及齿间摩擦的确对齿轮强度有着不可忽视的影响。
Abstract
The hogging or sagging deformation of boat hull may be due to water buoyancy and resis?tance, gravity and inertia of ship while a ship navigates by water. The research results have shown that the deformation can result in changing the center distance of bearing supports of the gearing ar?ranged along the ship longitudinal direction. Under certain conditions, this change of the center dis?tance affects the meshing performance of helical gearing, ana leads to the reduction in the gearing life. In addition, the effect of interteeth friction on gear strength could be neglected, but it ’ s not the case for the helical gear fixed in boat. The optimal calculation equations for the bending fatigue strength of tooth root caused by the deformation of ship hull and interteeth triction were deduced by analyzing the forces exerted on the driving gear of helical gear drive. The calculation results show that the hull defor?mation and the interteeth friction have the great effect on the tooth strength.
关键词
机械设计 /
船体变形 /
摩擦 /
斜齿轮 /
弯曲疲劳强度
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Key words
macmnery design /
ship hull deformation /
friction /
helical gear /
bending fatigue strength
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