Tribological behavior of tribo-pairs in water hydraulic radial piston pumps

Abstract

Friction and wear tests were performed on five Cu-based materials and three polyether ether ketone (PEEK)-based composites sliding against 17-4PH and 42CrMo4 coated with tungsten carbide-reinforced Ni-based coating. Two types of pin-on-disk specimens were used to represent the slipper/eccentric drive and piston/sleeve gap seal tribo-pairs in water hydraulic radial piston pumps. The experimental results showed that the QSn8-0.3 slipper material exhibited the highest steady-state friction coefficients for sliding against both 17-4PH (0.156) and coated-42CrMo4 (0.894). Glass fiber-reinforced PEEK exhibited the highest steady-state friction coefficients for sliding against the two specimens (0.540 and 0.420). The ZCuPb15Sn8/17-4PH showed the highest wear rate for the representative slipper/eccentric drive tribo-pair (26.86 × 10−6 mm/Nm); glass fiber-reinforced PEEK/17-4PH showed the highest wear rate for the representative piston/sleeve gap seal tribo-pair (46.91 × 10−6mm/Nm). The wear mechanisms of the two types of tribo-pairs were characterized through scanning electron microscopy, profilometry, and energy-dispersive spectroscopy analyses. Furthermore, the effects of hardness, pv values, coating, and reinforcement on the tribological behavior of the two types of tribo-pairs were analyzed.

Design and experimental validation of a valve-distributed water radial piston pump

“…The angle between line AO j j and the horizontal line is a, and the angle between line BO j j and the horizontal line is u 2 . Based on the structural dimensions, angles b and g are equal to 2 7 p. Therefore, angles a and u 2 can be obtained using equations ( 3) and (4), respectively:…”

“…Water hydraulic radial piston pumps (RPPs) have the advantages of excellent anti-noise characteristics, low pulsation, and reduced leakage and are widely used to transmit high pressure and power in various industrial applications, [1][2][3] such as seawater desalination, descaling, and coal mining. According to the different drive ends, RPPs can be divided into two typical types 4 : rotary cylinder blocks and eccentric cams.…”

Tribological properties of a novel iron‐based self‐lubricating composite

“…Wu et al 16 showed that the density of the tribopair material has a greater effect on the COF than Poisson's ratio or modulus of elasticity. Li et al 17 examined the effect of the material hardness and product of pressure and velocity (PV) value on the tribological behaviour of the tribopairs in a water hydraulic radial piston pump. Lysykh et al 18 found that surface hardening with boron and copper enhanced the mechanical properties of AISI L6 and 5140 steels and significantly increased their wear resistance.…”