Abstract

In this study, tightening and untightening experiments were conducted for pitch difference nuts toward realizing good anti-loosening performance. By applying the three-dimensional FEM, the relationship between the tightening force F and the tightening torque T was clarified by varying the pitch difference α during the whole nut tightening/untightening process. The well-known F-T formula available for tightening the normal nut (α = 0) agrees with the FEM results and the F-T formula for untightening the normal nut (α = 0) was newly proposed. Then, the loosening resistance ability of the pitch difference nut was clarified focusing on the untightening in comparison with the normal nut.

摘要

在这项研究中，对螺距差螺母进行了拧紧和拧松实验，以实现良好的防松性能。通过应用三维 FEM，通过在整个螺母拧紧/松开过程中改变螺距差α ，阐明了拧紧力F和拧紧扭矩T之间的关系。可用于拧紧普通螺母 ( α = 0) 的著名F - T公式 与 FEM 结果和用于松开普通螺母的F - T公式 ( α = 0) 是新提出的。然后，与普通螺母相比，以防松度为中心阐明了螺距差螺母的抗松动能力。