Structural Optimization Design On The Key Parts Of Swash Plate Axial Piston Pump

Swash plate axial piston pump is an important element in hydraulic pressure system, it iswidely used in all kinds of mechanical products especially in the field of engineeringmachinery. Piston sector，slipper-pair and port pair are the three key parts of swash plateaxial piston pump, meanwhile，it absolutely decides whether the good performance of entireplunger pump or not. Besides, the further study of performance characteristic of piston sector，slipper-pair and port pairare the key to improve plunger pump’s performance characteristic.Piston，slipper and valve plate are the most important part of the three moving parts thatdiscussed above respectively, and any unreasonable sizable or structural design will lead toperformance degradation. Therefore, the sizable and structural optimization of piston，slipperand valve plate is the key to improve plunger pump’s performance characteristic.This dissertation put forward the main influencing factors of the swash plate axial pistonpump’s structure and properties, and analyzed correlation between the piston number andthose main influencing factors. Obtain the best program of the piston number using thecomprehensive factor evaluation method which is a comprehensive weighted andcomparison of every factor. Considering the total loss of efficiency due to the leakage andfriction between piston and cylinder, a mathematical model of the overall efficiency losseswas built. Based on the principle of minimum loss of efficiency, a numerical method ofminimum left length of cylinder was proposed. While in order to make sure that the pistonthat is in the cylinder works normally, not broken because of friction locking, a strengthchecking method of piston and cylinder vice was proposed at the same time. It is used toverify the reasonableness of minimum left length of cylinder. Or based on the principle ofsliding piston and cylinder strength, a minimum left length of cylinder method was proposed.Based on the principle of minimum total efficiency loss, the optical gap between piston andcylinder was calculated. Based on Fluent simulation, a slipper damping hole with severalkinds of diameter such as1.6mm,1.8mm and2.0mm and several kinds of length such as3mm,5mm and7mm was chosen to have a simulation analysis about the model of slipper’sinternal flow passage. The research of the relationship between damping hole size and thefluid flow in slipper shows that it is the best design for the integrated performance of slipperwith the diameter1.8mm and length5mm, and not only meet the requirements of thecarrying capacity of the oil chamber pressure, but also the leakage is moderate. Therefore, itprovides slipper damping hole with a optical design. Based on the fluent simulation, aresearch of which damping groove width of valve plate in the triangle point of60degrees, 70degrees,80degrees,90degrees and100degrees and depth angles of10degrees,11degrees,12degrees,13degrees and14degrees were chosen to analyze plunger cavitypressure transients, and then the result show that it is the best design for the integratedperformance of valve plate’s damping oil pressure at the inlet groove width angle with70degrees and depth angle with11degrees and suction inlet dampers lot width angle with100degrees and depth angle with13degrees, and not only the vice has a better performance ofpressure shocking, but also noise can be effectively controlled.