某船尾轴液压无键套合联轴器的过盈安装研究

STUDY ON INTERFERENCE INSTALLATION OF HYDRAULIC KEYLESS SLEEVE COUPLING FOR A SHIP’S TAIL SHAFT

针对某船调距桨更换桨叶后承载功率增加而产生的液压无键套合联轴器的使用安全性问题,对传递扭矩和推力的联轴器箍套、锥套与尾轴的过盈安装进行了研究。首先分析了液压无键套合联轴器的组成及工作原理,接着研究了联轴器过盈安装的厚壁圆筒理论,根据厚壁圆筒某直径处的应力、变形量的表达公式,计算了传递2.8倍额定扭矩时联轴器套合锥面的过盈量和箍套的轴向位移。接着,计算了传递2.8倍额定扭矩时套合锥面平均直径处的切向应力、合成主应力,校核了联轴器的强度。接着,根据套合锥面最大压应力不大于0.7倍屈服强度的规定,计算了联轴器套合锥面的最大过盈量和箍套的最大轴向位移。接着,研究了联轴器的安装、测量误差对联轴器传递能力的影响。接着,考虑表面粗糙度造成的过盈量损失,确定了在规范允许范围内的过盈量设计值和轴向位移设计值。最后,研究了联轴器过盈安装的工艺问题。研究结果表明,箍套过盈量及轴向位移的设计值满足传递2.8倍额定扭矩的船检规定,套合锥面的压应力不超过材料的0.7倍屈服强度,满足使用要求;研究结果和安装工艺可供同行借鉴。

Absrtact Aiming at the safety problem of the hydraulic keyless sleeve coupling caused by the increase of bearing power of a ship’s CPP,studied the interference installation of coupling sleeve-cone sleeve-tail shaft for transferring torque and thrust.Firstly,analyzed the composition and working principle of hydraulic non-key sleeve coupling,then studied the thick-wall cylinder theory of the coupling interference fit,according to the formula of the stress and deformation amount at a certain diameter of the thick-wall cylinder,calculated the interference amount of coupling sleeve cone surface and axial displacement of coupling sleeve when transferring 2.8 times rated torque.Then,calculated the tangential stress and synthesized the principal stress at the mean diameter of the sleeve-in conical surface at 2.8 times of the rated torque,checked the strength of the coupling.Then,according to the stipulation that the maximum compressive stress of the cone surface was not more than 0.7 times the yield strength,calculated the maximum cone surface interference and the maximum hoop sleeve axial displacement.Then,studied the influence of the installation and measurement error of the coupling on the transmission capacity.Then,considered the interference loss caused by surface roughness,selected the design values of interference and axial displacement within the allowable range of the code.Finally,studied the technical of the interference fit of the coupling.The results show that the design interference value and hoop sleeve axial displacement meets the ship inspection regulation of transferring 2.8 times rated torque,and the cone surface compressive stress does not exceed 0.7 times yield strength of the material,which meet the application requirements,and the research results and installation technology can be used for reference by peers.