Abstract
An innovative hydrodynamic–magnetic compound support (HMCS) is proposed for the cylinder block–valve plate pair of the axial piston pump. Compared with the traditional design method, the magnetic structure provides a fixed magnetic torque to balance the residual torque, which causes eccentric wear on the valve plate and keeps the compression coefficient constant. First, the structure and principle of the HMCS are introduced, the magnetic model is established together with relative hydraulic models, and the influence of the permanent magnet length on the magnetic force is obtained. By studying the magnetic moment, the optimal structure of the magnetic pole is determined. Next, the 3D finite element method is used to simulate the magnetic forces under different pole gaps. After that, a reasonable magnetic pole gap and flux density distribution are determined. To obtain the influence mechanism of the HMCS on the cylinder block, the changing law of the track radii of hydraulic forces and average difference in the track radii are analyzed. Finally, the trend of the resultant torque of the cylinder block under multiple working conditions is analyzed. The results show that the HMCS can balance the residual torque acting on the valve plate, which is beneficial in preventing the occurrence of eccentric wear of the valve plate.
Highlights
Axial piston pumps are compact structures with high power density
The overturning torque needs to be offset by the additional contact torque on the valve plate surface, which has a significant impact on the reliability of the piston pump
This paper innovatively puts forward the hydrodynamic– magnetic compound support for the cylinder block–valve plate pair of the axial piston pump
Summary
Axial piston pumps are compact structures with high power density. They have important applications in hydraulic systems in machinery and aviation. The cylinder block–valve plate pair is the most important friction pair with the highest failure rate in a piston pump. It directly affects the overall performance of the piston pump. The hydrodynamic–magnetic compound support (HMCS) uses the force from a permanent magnet to bear the additional contact torque of the material surface, which prevents inclination of the cylinder block to some extent. An effective way to improve the reliability of the friction pair in a pump is to include a magnetic force in the design of a cylinder block–valve plate pair to realize the hydrodynamic–magnetic compound support. The structure is composed of a permanent magnet, an iron core, magnetic insulation materials, etc It can realize the HMCS of the cylinder block–valve plate pair in an axial piston pump. It is composed of a permanent magnet, a radial stator, an axial stator, an annular iron core, and a magnetic insulation material It is connected in series with the pump shell, and the annular iron core is fixed on the cylinder block to allow for synchronous rotation.
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