Study on the Influence of Speed on the Cylinder Block Overturning process of Aerospace Bent-axis Piston Pump

Bent-axis piston pump is the core component of hydraulic system inaerospace and cylinder block-valve plate pair is the most complicated contact pair within the pump. The cylinder block will inevitably tilt in the process of rotation, on the one hand, it will lead to excessive leakage of the cylinder block-valve plate pair and reduce the volumetric efficiency. On the other hand, the surface wear of valve plate is aggravated, which seriously restricts the life of piston pump. This paper analyses the impacet of inertia force and centrifugal force of piston-connecting rod on balance the cylinder block, and the acting point trajectory of the force between psiton and cylinder. Within one piston interval angle, the change rules of the resultant torque and its radius acting on cylinder block with increasing speed are analyzed quantitatively. It lays a foundation for further research on the relationship between cylinder block motion and flow characteristics in cylinder block-valve plate pair of bent-axis piston pump.