Relation between Sliding-Part Temperature and Clearance Shape of A Slipper in Swashplate Axial Piston Motors

Abstract

Temperature and behavior of a piston motor slipper were examined using a test rig. The experimental setup comprised a tester, a hydraulic circuit, control units, and measuring instruments. The tester included a servomotor and a chamber enclosing two piston assemblies with slippers, a rotating disk, displacement sensors, and thermocouples. The sliding surface diameter of the test slipper was 32 mm; the test oil was hydraulic oil with VG46. Tests were conducted at supply pressures up to 35 MPa, rotational speeds up to 26.7 s −1 , and oil temperature of 30-50°C. The pad temperature increased with the supply pressure and rotational speed. The pad established a temperature gradient, being maximized near the slightly-outer trailing edge and minimized near the leading edge. The temperature differences were influenced by the rotational speed, but were almost independent of the supply pressure.

Power loss characteristics analysis of slipper pair in axial piston pump considering thermoelastohydrodynamic deformation

“…A validation case is chosen from the published paper to verify the current result of the TEHD model of the slipper pair. A TEHD analysis of the slipper pair is presented in Kazama et al In this experiment, the eddy current sensors (eddy NCDT 3300) were found to be the smallest available on the market which are used to measure film thickness. The outer diameter of the displacement sensor is 2 mm.…”

“…Figure 10 shows the film thickness calculated by HD, EHD, and TEHD and gives a comparison with the experimental result from Kazama. 31 As the slipper runs in the discharge stroke, the increase in the TEHD deformation is reflected immediately by a decrease in the fluid film thickness. The value of the film thickness under the TEHD lubrication condition is lower than those of the HD and EHD results.…”

“…Table lists the structural parameters of the slipper pair. The results for the slipper bearing were investigated by Kazama et al, including the fluid film thickness distributions and fluid film temperature distributions, amongst others. The experimental setup is described in detail in Kazama et al Table lists the input parameters for the computational model.…”

The Impact of the Deformation Phenomenon on the Process of Lubricating and Improving the Efficiency Between the Slipper and Swashplate in Axial Piston Machines

“…As the Slipper motion on the swashplate is dynamic, and taking into account the deformation caused by thermal expansion and hydrostatic pressure loads, the oil film thickness between the Slipper and Swashplate is not uniform at under the Slipper land. When the oil temperature is lowered, the increase in temperature becomes more pronounced [36]. The oil thickness between the Slipper land's size subjected to the greatest load and the swashplate is minimal (see illustration in FIGURE 15).…”

Experimental Research on the Dynamic Lubricating Performance of Slipper/Swash Plate Interface in Axial Piston Pumps

“…Chao et al [3] presented a review of the test rigs of the slipper bearing in axial piston pump. The test rigs are classified into four groups in this paper: stationary cylinder and swash plate [22], stationary cylinder and rotational swash plate without tilt [23,24], stationary cylinder and rotational swash plate with tilt [25] and stationary swash plate and rotational cylinder [26,27].…”