Research On The Failure Mechanism Of Slipper Retainer From Axial Piston Pump

Working on actual condition,one of the breakdowns on the axial piston pump is the failure of the slipper retainer,which is mainly manifested the fracture on slipper retainer,so it is necessary to analyze the causes of fracture on the slipper retainer.In this paper,the typical A10 V axial piston pump is taken as the research object.By using the method of theoretical analysis,joint simulation and actual guidance conditions,this paper will discuss the weak points of the slipper retainer and the main factors that affect the safety of the slipper retainer in the actual working condition.The main contents are as follows:Firstly,this paper introduces the working principle of axial piston pump and the structure of common slipper retainer.By introducing the collision mechanism analysis,According to the detailed theoretical analysis of the forces on the slipper retainer,the distribution of forces in all aspects is integrated,the distribution of each force vector borne by the slipper retainer in its structure presents a periodic change of "butterfly bending moment M" with the boundary of oil suction and discharge side as the reference line.The virtual prototype of fluid rigid flexible coupling simulation of piston pump was successfully built by selecting reasonable fluid calculation model and multibody dynamics simulation parameters.According to the results of the joint simulation of Adams rigid flexible coupling finite element and pumplinx fluid finite element,this paper analyzes the basic rules of the collision between the slipper and the slipper retainer and the magnitude of the instantaneous collision force and the impact of the collision force on the slipper retainer.In consideration of its long-term multi cycle operation,the stress distribution and size of the slipper retainer under normal working conditions are interpreted,and the weak points of the motion stress of the slipper retainer are found.According to the force vector monitoring of nine holes in the slipper retainer from joint simulation,it is found that the vector distribution presents the butterfly bending moment obtained from the theoretical stress analysis that proves the correctness of the theoretical analysis and simulation results,and discusses the relationship between the bending moment and the weak point of the slipper retainer,as well as the causes of possible fracture on the slipper retainer.Focusing on the weak points and influence of weak points on the structure of slipper retainer analyzed by the joint simulation results on the structure of the slipper retainer,this paper puts forward the structural improvement scheme of "Nang-side slipper retainer".With the verification of the joint simulation calculation,which points out that "Nang-side slipper retainer",to a certain extent,improves the overall safety factor of the slipper retainer.Mechanism and phenomenon of fracture on the slipper retainer related to the real situation.Based on the theoretical analysis and simulation results,there are three main factors are pointed out: 1.Fracture of slipper retainer from piston pump caused by oil pollution;2.Fracture of slipper retainer caused by cavitation in piston pump: 3.Fracture of slipper retainer caused by bulging deformation of piston.The above factors are analyzed and discussed in detail one by one,including theoretical analysis,joint simulation and guidance of actual situation.The main reasons for the fracture of the slipper retainer of the piston pump under the actual situation are explained.