Session: 01-02: Pumps and Motors 1: Piston and Membrane Machines

Paper Number: 139407

139407 - Dynamic of an Axial Piston Pump With Floating Pistons 

Abstract: 

A new structure of the axial piston pump was proposed to address the limitation of its application under low viscosity medium conditions due to the insufficient oil film bearing capacity. The piston of this structure is in a floating state in the axial direction, and both ends of the piston are supported by a discrete cylinder in the shape of a spherical joint. Because of the adaptive ability of the spherical joint in the orientation, the lateral force borne by the piston during operation has been eliminated. And through a pair of bevel gears, the relative distance between the spherical joints at both ends of the piston varies with the rotation of the shaft, thereby enabling the pump to achieve a change in the cylinder volume. To demonstrate the superiority of the structure, firstly a mathematical model for dynamic analysis was constructed based on its working principle. Then, a kinematic analysis was conducted on a developed product, and co-simulated with AMESim to obtain the pressure pulsation in the cylinder chamber. Subsequently, the dynamic characteristics of each component and the contact stress of each friction pair were calculated. Finally, the simulation data was compared with that of a traditional swash plate axial piston pump of the same specifications. The results showed that the mechanical characteristics of each friction pair of the new piston pump were more stable, the contact stress was smaller, and the demand for oil film bearing capacity can be reduced. Therefore, this type of structure is more suitable for low viscosity media and low speed operating conditions.

Presenting Author: Baoyu LIU Taiyuan University of Science and Technology

Presenting Author Biography: Baoyu Liu, a doctoral student at Taiyuan University of Science and Technology, was born in 1994 and is dedicated to scientific research in the field of fluid power and motion control.

Authors:

Baoyu LIU Taiyuan University of Science and Technology
Lifeng Ma Taiyuan University of Science and Technology
Gaocheng An Taiyuan University of Science and Technology
Lankang Li Taiyuan University of Science and Technology
Jiaqi Guo Taiyuan University of Science and Technology
Wenwei Wang Taiyuan University of Science and Technology