The invention relates to a pull rod joint design method. The method comprises the steps that the pull rod joint rigidity requirement of a user is compared with the maximum rigidity of a rubber layer;and linear
stiffness design or
variable stiffness design is adopted for pull rod nodes according to the comparison result.
Variable stiffness design is achieved in the mode that the inner backstop isarranged between a mandrel and an outer sleeve. An inner backstop and a rubber layer are used for bearing fatigue load together so as to control the fatigue load borne by the rubber layer and the strain of the rubber layer,
fatigue cracking caused by overlarge strain of the rubber layer is avoided, and the reliability of the traction joint is improved.