Study On The Anti-friction Characteristics Of The Piston Ring Of The Inclined Shaft Plunger Motor

In order to adapt to the continuous development of mechanical equipment in the engineering field and the higher requirements of production conditions for mechanical products,it is particularly important to improve the reliability of hydraulic system and components.The inclined high pressure plunger motor is an important power actuator in the hydraulic system,which transforms the pressure energy into mechanical energy to output power.Among them,the motor is divided into two kinds of structures: swashplate structure and swashplate structure.Compared with the traditional swashplate structure,the swashplate structure has larger output displacement and higher mechanical efficiency.At home and abroad,the research on pump and motor is mainly focused on swashplate structure,while the research on swashplate plunger motor is less.The sealing ring is the sealing device of the plunger motor,and the friction and wear are the main reasons for the failure of the sealing ring,while the friction and oil film characteristics are the main factors affecting the friction and wear.In this paper,multi-body dynamics and hydrodynamics are used to study the friction characteristics of the seal ring,and the influence of different structural parameters on the normal contact force and wall shear force is analyzed;the change rule of oil film characteristics in multi physical fields is analyzed,and the more accurate results are obtained compared with the two-phase calculation.The research conclusions provide theoretical guidance and scientific basis for the design of the seal ring and the efficiency improvement of the motor According to.The main contents of this paper are as follows:Firstly,the three-dimensional model is built according to the solid body of the plunger motor,and the constraint relationship between the parts is added based on ADAMS software.In order to comprehensively consider the influence of elastic deformation on the seal ring,the seal ring of the flexible component is discretized,and the flexible body of the seal ring is obtained and replaced with the rigid body.Then the multi-body system of the plunger motor is simulated The normal positive pressure and friction force of the seal ring are obtained.Secondly,the flow field model between seal ring and cylinder bore is established,and the mesh is divided in ICEM,and the mesh independence is verified.Then,fluent is used to analyze the flow field of seal ring,analyze the characteristics of seal ring wall gap flow,and obtain its gap flow pressure distribution and wall shear stress.Thirdly,based on ANSYS,the multi physical field coupling analysis of the oil film in the seal ring gap is carried out,considering the interaction of structure field,temperature field and flow field,the distribution of the pressure field and thickness field of the oil film in the gap under the multi physical field coupling,as well as the situation of the leakage,and the influence of different pressure difference and shear speed on the oil film characteristics is analyzed.Finally,the structural parameters of the seal ring are optimized,and the effects of different spindle angle,plunger cone angle and width diameter ratio on the friction characteristics are analyzed and studied respectively.It is concluded that the optimized size can reduce the normal normal normal pressure and wall shear stress,then reduce the friction force of the seal ring and reduce the friction and wear.It is concluded that the optimization of the structural parameters of the seal ring can achieve obvious results Antifriction effect.