Study On Dual Stator Radial Piston Motor With Force-coupling End-face Flow Distribution

In this paper,the existing internal curve multi-acting radial piston motor is analyzed,and it is concluded that the output torque and speed pulsation rate of the traditional motor are large when running.In order to make the roller pressed on the motor track during the return stroke,it is necessary to set a certain return back pressure in the return pipeline,which causes a certain waste of hydraulic energy in the input motor and reduces the output efficiency.In view of the above problems,this paper presents a dual-stator radial piston motor with end face distribution,which can achieve radial force balance on the rotor by setting plungers with the same working state at the axisymmetric position of the rotor,and the output form of the plunger at the symmetrical position is the couple.A special flow channel is designed on the cover of the oil distribution end to form the inner and outer double motors working simultaneously in the motor shell.When the motor is running,its internal and external rails work alternately,which can continuously output torque.Under the premise of improving the output stability,the dual-stator motor expands the displacement,making it more suitable for the working conditions of low speed and high torque.In this paper,the basic structure of the motor is designed,and its structural characteristics and working principle are introduced in detail.The working conditions of the motor under different combinations of internal curve number and plunger number are analyzed.The internal relationship between the force of the rotor and the working stability of the motor and the two combination parameters is obtained,and the number of the motor and the plunger number studied in this paper are determined.The calculation formula of output instantaneous torque and speed of Mada is derived,and the amplitude and angle of each section of the internal curve are reasonably distributed to reduce the output pulsation rate of the motor to the greatest extent.The curve equation of the inner and outer double stator tracks of the motor is obtained.Under ideal conditions,the output performance of the dual-stator motor is compared with the traditional internal curve motor with the same parameters.It is concluded that the output torque and speed ripple rate of the dual-stator motor can be reduced by twice.In this paper,the key dimensions of the motor oil distribution ring are designed,and the end face separation force between the oil distribution ring and the rotor is theoretically analyzed.The leakage of piston pair and oil distribution ring rotor pair which affect the volumetric efficiency of motor is analyzed and the calculation formula is given.The StaticStructual module of Ansys finite element analysis software is used to analyze the stress of the key transmission pair of the motor.The results show that the deformation at the connecting rod increases with the increase of pressure,and the deformation is small under the rated working pressure.The structural strength meets the requirements,and the structure of the contact pair is optimized and improved.The Fluent software is used to simulate and analyze the flow state of oil in the flow channel of the motor at a certain time.It is found that the impact at the corner is large.The flow velocity at the inlet of the oil distribution ring is 9.78 m/s,which is less than 10 m/s in the normal range,and the pressure loss in the pipeline is small,indicating that the design of the motor oil channel is reasonable.