Characteristics Analysis And Structure Optimization Of Slipper With Static And Dynamic Pressure Support Used In The Axial Piston Pump

Through the reciprocating motion of the piston, axial piston pump changesthe volume of the cylinder body and the piston cavity. And slipper pair is thejoint between the piston and the swashplate. When the pump running, highpressure oil which through the slipper damping to the slipper pair has the effectof lubrication, and also has the effect of losing the oil and wearing the slipper.Experiments show that the support structure which made of sealing ring andsupport ring has an important influence on underside oil films’ microscopiccharacteristics, thus influences the performance of the pump. Therefore, researchthe design principles of the support structure of the slipper has great significancefor achieving high efficiency and low power consumption pump.At present, the design of slipper structure is accordance with thehydrostatic bearing theory, but some analysis of part parameter on slipperperformance is lack, and in China the research of polycyclic slipper is few.Meanwhile, when the slipper at high-speed, dynamic pressure effect and squeezeeffect of oil film will make complex changes in oil film properties, and itsinfluence should not be neglected.The article analyses the support structure of slipper in terms of thehydrostatic and hydrodynamic, which perfects the design of slippers’ supportstructure. Modeling is built for the motion, force and pressure-flow negativefeedback of slipper damping equations. Take the dished deformation of dampingtube slipper undersurface and minimum displacement of every point fromequilibrium position under forces as the analysis targets, study how the supportstructure of slipper affect the performance of pump from leakage and wearingaspects. Design software for analyzing the slipper support under static pressureand verify the feasibility of the software through an example, which provides thestatic design of slipper a practical design tool.Dynamic pressure effect and the squeezing effect produced from thecircumferential rotation of slipper are studied. Modeling is built for the wedge oilfilm equations. and. Study the coupling relationship between the force andmoment of slipper and wedge oil model of slipper,which based on the pressure-flow negative feedback of slipper damping model and the wedge oil film model.Draw the logic flow of solving oil film pressure field and thickness undercoupling relationship. Programing the solver to calculates the wedge oil film’s microscopic characteristic. And using MATLAB software to design a softwarefor analyzing the slippers’ fluid dynamic pressure support structure. So that theuser operates friendly.And verify the feasibility of the software through anexample and the consistency of the calculated results.Draw the flowchart of using the slipper hydrostatic and hydrodynamicsupport analysis software. And take the widely used A4VG series pump whichdisplacement is56ml as an example, using the two software to analysis theeigensensitivity of slippers’ structure parameters. Research how the structure ofthe slipper support affects the oil film microscopic characteristics. And based onanalysis results, carried out the optimal scheme and drawn the optimal slippers’structure diagram. Sums up the design principles of slipper support structure withthree rings.