Comparative study of materials for friction pairs in a new high water-based hydraulic motor with low speed and high pressure

2019 ◽  
Vol 71 (1) ◽  
pp. 164-172 ◽  
Author(s):  
Bingjing Qiu ◽  
Jiyun Zhao ◽  
Jiaxiang Man
Keyword(s):  
High Pressure ◽  
Working Conditions ◽  
Surface Coating ◽  
High Water ◽  
Hydraulic Motor ◽  
Content Type ◽  
Low Speed ◽  
Water Based ◽  
Friction Performance ◽  
Matching Type

Purpose Aiming at improving the mechanical efficiency, the applicability and the working life of high water-based hydraulic motor (HWBHM) under working conditions at low speed and high pressure, the friction performance of different matching materials for piston slipper – crankshaft pair with high water-based hydraulic fluid (HWBHF) under working conditions at low speed and high pressure – were studied. Design/methodology/approach The friction experiments for different materials (316L, 316L with surface coating OVINO – tetrahedral amorphous carbon [TAC; 316L-TAC] – 316L with surface coating OVINO-graphite intercalated compound [GIC; 316L-GIC] and polyetheretherketone [PEEK] reinforced with 30 per cent carbon fiber [PEEK-30CF]) under HWBHF lubrication were implemented on a pin-disk friction abrasion machine to determine the variations of coefficient of friction (CoF) and wear rate for each matching materials. In addition, the roughness and the morphology of worn surface of different matching materials were quantitatively characterized. Findings The study revealed that material combinations have different friction performances. Test results showed that the abrasion of matching type stainless steel (SS) and SS is rather serious, and the method of surface coating could improve the friction performance of SS when friction with other materials. For matching type of SS with surface treatment (SS-ST) and SS-ST, 316L-GIC and 316L-GIC have relatively stable CoF, and the wear rate was smaller than other matching materials, while 316L-TAC and 316L-TAC has the smaller CoF than that of 316L-GIC. Matching materials 316L-GIC with PEEK-30CF of matching type SS-ST and PEEK-30CF has more stable COF and better wear resistance than those of other matching materials. Originality/value This research has laid a foundation for the improvement of service life and working efficiency of friction pair in HWBHM under working conditions at low speed and high pressure.

Characterization and performance analysis of a new type of a high water-based hydraulic motor with a self-balanced distribution valve mode

2017 ◽  
Vol 231 (24) ◽  
pp. 4655-4669 ◽  
Author(s):  
Bingjing Qiu ◽  
Jiyun Zhao ◽  
Liang Zhao
Keyword(s):  
Flow Distribution ◽  
High Water ◽  
Test Method ◽  
Structure Parameters ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Hydraulic Motors ◽  
Water Based ◽  
Balanced Distribution ◽  
High Torque

High water-based hydraulic motors (HWBHMs) with advantages including higher specific power and shorter acceleration and braking time can be used to directly drive loads. In particular, low speed and high torque high water-based hydraulic motors work well in limited space and for special applications (open flame areas). However, traditional structure and flow distribution mechanisms cause serious leakage and lower work efficiency for low speed and high torque high water-based hydraulic motors. Thus, a new structure and flow distribution mechanism with self-balanced distribution valve groups for a high water-based hydraulic motor need to be developed to work in high pressure, low speed, and high torque conditions. In this paper, a high water-based hydraulic motor was theoretically analyzed and the working principle behind a high water-based hydraulic motor was briefly introduced. Numerical simulations were performed to examine the effects of the distribution valve parameters on the distribution performance. An orthogonal test method was used to determine the optimized structure parameters. A simulation model of a high water-based hydraulic motor was established using the AMESim simulation method to validate the feasibility of the optimized structure parameters. This research has laid a foundation for the further development of a high water-based hydraulic motor with low speed and high torque.

scholarly journals Study the Influence of Surface Morphology and Lubrication Pressure on Tribological Behavior of 316L–PTFE Friction Interface in High-Water-Based Fluid

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 405
Author(s):  
Jiaxiang Man ◽  
Jiyun Zhao ◽  
Liangchen Song ◽  
Haifeng Yang
Keyword(s):  
Surface Morphology ◽  
Normal Load ◽  
Friction Pair ◽  
Experimental System ◽  
High Water ◽  
Hydraulic Motor ◽  
Stainless Steel 316L ◽  
Lubrication Film ◽  
Low Viscosity ◽  
Water Based

Because of the low viscosity of high-water-based fluids, the intense wear and leakage of key friction pairs represent a bottleneck to the wide application of the high-water-based hydraulic motor in engineering machinery. In this work, based on the common characteristics of plane friction pairs, the friction experiments of a 316L stainless steel (316L)–polytetrafluoroethylene (PTFE) friction pair under various working condition were carried out by a self-designed friction experimental system with fluid lubrication. The influence of lubrication pressure and surface morphology on the 316L–PTFE friction pair was investigated both experimentally and theoretically. The experimental and numerical results indicated that increasing lubrication pressure reduced the surface wear of PTFE sample, but the leakage of 316L–PTFE friction pair also increased. It could not form an effective fluid lubrication film in the 316L–PTFE friction pair under low lubrication pressure, which caused the severe wear in friction pair interface. The smooth 316L surface could be conducive to the formation of high-water-based fluid lubrication film in 316L–PTFE friction interface. The pressure distribution of high-water-based fluid lubrication film in 316L–PTFE friction pair was also obtained in fluent. The PTFE surface was easily worn when the lubrication film in the friction pair was too thin or uneven. The friction and wear were obviously improved when the normal load was balanced by the bearing capacity of the high-water-based fluid lubrication film.

Experimental Research on Wear Loss of Slipper Pair in Axial Piston Hydraulic Motor Lubricated with High Water Based Fluid

2012 ◽  
Vol 452-453 ◽  
pp. 119-123
Author(s):  
Yong Xia Gu ◽  
Zhong Ning Zhou ◽  
Fei Gao
Keyword(s):  
Experimental Research ◽  
High Water ◽  
Experimental Results ◽  
Wear Volume ◽  
Wear Loss ◽  
Hydraulic Motor ◽  
Water Based ◽  
Wear And Tear ◽  
Axial Piston

The slipper pairs with concaves of reasonable and unreasonable structures and without concave originally are chosen for the experiment. The experimental results show that appropriate concave distribution can improve the wear and tear condition of the slipper bottom. Under the same experimental condition, the fringe wear volume can be reduced by 28.77%, and the overall wear volume 68.72%, which is the best result.

scholarly journals A Piston-Swiveling-Cylinder Pair in a High Water-Based Hydraulic Motor with Self-Balanced Distribution Valves

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3175 ◽  
Author(s):  
Jiyun Zhao ◽  
Bingjing Qiu ◽  
Jiaxiang Man
Keyword(s):  
Friction Coefficient ◽  
Fluid Structure Interaction ◽  
High Water ◽  
Hydraulic Motor ◽  
Working Pressure ◽  
Structure Interaction ◽  
Water Based ◽  
Balanced Distribution ◽  
Working Performance ◽  
The Difference

To improve the low viscosity and poor lubrication characteristics of high-water-based hydraulic liquid, the abrasion and leakage problems in hydraulic components need to be addressed. In a high water-based hydraulic motor with self-balanced distribution valve (HWBHM-SDV), there are two key friction pairs: the piston-crankshaft pair and piston-swivelling-cylinder (PSC) pair. To study the working performance of the PSC pair in HWBHM-SDV, we firstly designed the structural parameters. We found that, within the working speed 0–100 rpm, the leakage in the PSC pair is mainly caused by pressure-gradient flow, and the influence of the seal will not be significant when the seal length is 24 mm. Then, the friction coefficients of different matching materials were tested. It was found that the friction coefficient of 316L stainless steel with OVINO-GIC (OVINO-graphite intercalated compound) coating (316L-GIC)/PEEK reinforced with 30% carbon fibre (PEEK-30CF) is about 0.02~0.04, and the friction coefficient of 316L-GIC/316L-GIC is about 0.05–0.07. Finally, the influences of factors (clearance, temperature, pressure, and material) on leakage performance were analysed based on an orthogonal test method considering fluid-structure interaction. It was found that clearance has the most significant influence on leakage, followed by pressure and liquid temperature, and the difference between matching materials 316L-GIC/316L-GIC and 316L-GIC/PEEK-30CF is insignificant when the clearance is less than 8 μm and the working pressure is less than 10 MPa. Moreover, the difference in volume efficiency loss between theoretical analysis and calculated result considering fluid-structure interaction increases with the increase of working pressure and working speed. To ensure good working performance of a PSC pair, matching materials 316L-GIC/PEEK-30CF could be selected for pressures below 15 MPa, while 316L-GIC/316L-GIC could be used at 28 MPa.

scholarly journals Design of a high water-based fluid, high-pressure, and large-flow safety valve

2019 ◽  
Vol 2019 (13) ◽  
pp. 79-85
Author(s):  
Geqiang Li ◽  
Liaoyuan Li ◽  
Bingjing Guo ◽  
Yuesong Li
Keyword(s):  
High Pressure ◽  
Safety Valve ◽  
High Water ◽  
Water Based ◽  
Large Flow

Wear Research and Improvement Design of Slipper Pair in Axial Piston Hydraulic Motor Lubricated with High Water Based Fluid

2011 ◽  
Vol 422 ◽  
pp. 752-757
Author(s):  
Yong Xia Gu ◽  
Zhong Ning Zhou ◽  
Fei Gao
Keyword(s):  
Flow Field ◽  
Radial Direction ◽  
High Water ◽  
Bottom Surface ◽  
Hydraulic Motor ◽  
Lubrication Film ◽  
Water Based ◽  
Set Up ◽  
Axial Piston ◽  
Lubrication Effect

The flow field of lubrication film under the bottom of the slipper is analyzed particularly. The velocity in different points of the lubrication film on the bottom of the slipper is solved based on the premise that the rotation and self-rotation of the slipper has been taken into account of. This paper puts forward that regular concaves converging along the radial direction be set up in the cyclic zone of slipper’s bottom surface to enhance the lubrication effect and improve the overwear situation in the peripheral parts of the slipper.

Simulation on the Dynamic Characteristics of an Electromagnetic Relief Valve with High Pressure and Large Flow Rate

2013 ◽  
Vol 303-306 ◽  
pp. 1786-1789 ◽  
Author(s):  
Xiang Lin Liu ◽  
Xiao Feng He ◽  
Long Jun Luo ◽  
Xiao Hui Luo
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
Hydraulic System ◽  
Peak Pressure ◽  
High Water ◽  
Relief Valve ◽  
Fluid Medium ◽  
Large Flow Rate ◽  
Water Based ◽  
Large Flow

The use of electromagnetic relief valve with high pressure and large flow rate in hydraulic system is usually easy to bring vibration and noise issues, especially while water or high water based fluid (HWBF) is used as the fluid medium. In this paper, a HWBF electromagnetic relief valve with a cushion valve was presented and its simulation model was built based on AMESim software. Through simulation, it is found that the cushion valve can significantly reduce the peak pressure gradient of the electromagnetic relief valve during unloading process compared with that without a cushion valve. This research provides a new solution for solving the vibration and noise issues of a hydraulic system with electromagnetic relief valve.

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