Lubrication characteristics of the slipper–swash-plate interface in a swash-plate-type axial piston pump

2020 ◽  
pp. 095440622093294
Author(s):  
Xiangxu Meng ◽  
Chang Ge ◽  
Hongxi Liang ◽  
Xiqun Lu ◽  
Xuan Ma
Keyword(s):  
Hydrodynamic Lubrication ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Plate Interface ◽  
Load Pressure ◽  
Swash Plate ◽  
Lubrication Performance ◽  
Lubrication Characteristics ◽  
Axial Piston ◽  
Plate Type

An analytical approach based on a hydrodynamic lubrication model is presented to understand the bearing capacity, leakage, and friction moment of the slipper–swash-plate interface in a swash-plate-type axial piston pump. Furthermore, how the shaft speed, load pressure, and slipper attitude influence the lubrication performance of the interface is analyzed. The research shows that the slipper attitude has a significant effect on the pressure distribution. To improve the lubrication performance, a grooved sealing-land design is proposed, and the location and geometric parameters of the groove are analyzed. The results indicate that the optimal lubrication performance is achieved when the groove is 2.0–3.0 mm wide and 5–20 µm deep at its inner boundary.

scholarly journals Analysis of the Hydrodynamic Lubrication Characteristics of the External Return Spherical Bearing Pair of an Axial Piston Pump/Motor

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Haishun Deng ◽  
Lei Wang ◽  
Yongcun Guo ◽  
Yu Zhang ◽  
Chuanli Wang
Keyword(s):  
Friction Pair ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Operating Characteristics ◽  
Spherical Coordinate ◽  
Swash Plate ◽  
Lubrication Performance ◽  
Lubrication Characteristics ◽  
Spherical Hinge ◽  
Axial Piston

At present, the study on lubrication of return mechanism friction pair is only for the common axial piston pump, and the influence of kinematic characteristics of contact points between the retainer plate and the spherical hinge on lubrication of return mechanism friction pair is not considered. So, it is hard to directly apply the frictional lubrication characteristic of the bearing to design the external return mechanism. Based on the kinematic and operating characteristics of the external return mechanism and considering the lubrication situation of the friction pair under Newtonian fluid, a Reynolds equation in the spherical coordinate system was deduced, and then the lubrication of the external return spherical hinge under different structural parameters was analysed. The results show that different slant inclination of the external swash plate, pump shaft rotating speeds, and eccentricities all affect the lubrication characteristics of the friction pair, especially the slant inclination of the external swash plate and oil film clearance has great influence on axial leakage flow. Therefore, in the design of external return mechanism of the multirow axial piston pump, the lubrication performance of the external return spherical hinge under different slant inclinations of the external swash plate should be analysed and calculated.

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