| Green energy is the development trend of modern hydraulic, andvariable speed volume control system is the most energy-efficient hydraulic system. For these applications, a new structure of axial piston pump with rotary swashplate and pintle valve flow distribution was proposed. This pump can be bi-directional rotation, and its rotational inertia is small.Driven by a servo motor, the hydraulic system can be controlled rapidly and accurately.Firstly, on the basis of analysis of the widely usedpiston pumps at present, concerning the advantages, disadvantages and existing problems, the structure of rotary swashplate and pintle valve flow distribution was determined. Its working principle and structure characteristics were introduced. For the needs of principle verification facility stages, its expected performance indicators and main structural parameters(displacement, piston diameter, etc.) were determined.Secondly, according to the main structural parameters, kinematic analysis of this pump was carried out, the displacement, velocity and acceleration kinematic equations of the main moving parts were obtained. Then the stress analysis and design calculations of the main parts(slippers and pistons, ball guide and set plate, pintle valve, shaft-swashplate, and screws) were carried out. To solve the holding shaft problem between pintle valve and rear body, using the balanced pressure fields structure, the dimensions of grooves and radialorifices were determined.In order to reduce the pressure impact of piston chamber and reduce the noise, the triangular grooves on pintle valve were analyzed and calculated.Subsequently, according to theobtained structural dimensions of the parts, two-dimensional drawings of the pump were drawn, three-dimensional model of the pump was established by software Pro/Engineer, the dynamic analysis of the pump was carried out by software ADAMS. Under different pressure and speed, dynamic simulations of the pump were carried out. The piston velocity curves, shaft-swashplate force curves, the input power and torque curves were obtained. The simulation results coincided with the theoretical calculation results, indicating the correctness of movement and stress analysis in design calculation.Finally, the modal analysis of shaft-swashplate, pintle valve, front body and rear body were carried out by software ANSYS. The results showed that the resonance phenomenon would not occur within the design speed range.Currently the fixed displacement pumps applied to the variable speed volume control system are the gear pumps of foreign companies, and we have no domestic product. Compared with traditional pumps which cylinder block rotates, the reversible axial piston pump with low rotational inertiahas lower rotational inertia, faster response capability and better energy efficiency. This pump fills the gaps in the domestic market of variable speed volume control system, provides the hardware foundation of variable speed control system research. The first products have been manufactured by Jiangsu Oscen Hydraulic Technologies Co., Ltd., then the performance will be tested.
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