Abstract
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.
Highlights
Three key friction pairs of axial piston pumps and motors have been extensively researched worldwide, and scholars have achieved fruitful results [1,2,3], not much research has been conducted on the pair of retainer platespherical hinge. e return mechanism is a key component of an axial piston pump or motor and has a direct effect on the performance of the three friction pairs, as it provides the preload force to the three key friction pairs to ensure the slipper clings to the swash plate as the plunger is reciprocating [4,5,6]
It is necessary to study the lubrication characteristics of external return mechanism for two main reasons: (i) its friction-lubrication property affects the reliability of its own structure and (ii) its friction-lubrication property greatly influences the working stability of the three friction pairs of the axial piston pump
Is work studies the lubrication mechanism of the friction pair with the spherical geometry, establishes a spherical coordinate system, constructs a Reynolds equation of the external return mechanism in a spherical coordinate system, and analyses the influence of a variety of parameters under the condition of the hydrodynamic lubrication, such as swash plate inclination, rotating speed, and eccentricity on the oil film load-bearing capacity and lubrication state. us, this work aims to provide a reference for the energy dissipation rules and friction theory of the external return spherical bearing pair of the balanced double-row axial piston pump and the dual-drive axial piston motor
Summary
Three key friction pairs (slipper pair, flow distribution pair, and plunger pair) of axial piston pumps and motors have been extensively researched worldwide, and scholars have achieved fruitful results [1,2,3], not much research has been conducted on the pair of retainer platespherical hinge. e return mechanism is a key component of an axial piston pump or motor and has a direct effect on the performance of the three friction pairs, as it provides the preload force to the three key friction pairs to ensure the slipper clings to the swash plate as the plunger is reciprocating [4,5,6]. It is necessary to study the lubrication characteristics of external return mechanism for two main reasons: (i) its friction-lubrication property affects the reliability of its own structure and (ii) its friction-lubrication property greatly influences the working stability of the three friction pairs of the axial piston pump. Is work studies the lubrication mechanism of the friction pair with the spherical geometry, establishes a spherical coordinate system, constructs a Reynolds equation of the external return mechanism in a spherical coordinate system, and analyses the influence of a variety of parameters under the condition of the hydrodynamic lubrication, such as swash plate inclination, rotating speed, and eccentricity on the oil film load-bearing capacity and lubrication state. Is work studies the lubrication mechanism of the friction pair with the spherical geometry, establishes a spherical coordinate system, constructs a Reynolds equation of the external return mechanism in a spherical coordinate system, and analyses the influence of a variety of parameters under the condition of the hydrodynamic lubrication, such as swash plate inclination, rotating speed, and eccentricity on the oil film load-bearing capacity and lubrication state. us, this work aims to provide a reference for the energy dissipation rules and friction theory of the external return spherical bearing pair of the balanced double-row axial piston pump and the dual-drive axial piston motor
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