Pistons in radial hydrostatic piston pump undergoes a composite motion, which means that the pistons move in and out along the cylinder hole linearly, while pistons rotate with the cylinder. So an additional Coriolis inertia force should be considered.
Taking friction forces, inertia forces into consideration, the force equation sets were modeled. The forces, contact stress, friction forces and contact pressure angle acted on the piston were analyzed
in varied parameters such as piston length and roller radius. Analysis shows
that under higher output pressure the contact stress increases sharply. Conclusions
are obtained,which show that setting compound material cushion in the cylinder pairs, extending the piston length, and increasing roller radius will reduce the contact stress.
