Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

Kazama, Toshiharu; Tsuruno, Tadamasa; Sasaki, Hayato

doi:10.5739/isfp.2008.341

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…Many other researchers used the type (b) set up, as it recreates a quiet realistic test environment to evaluate slipper performance mainly by measuring friction and leakage [8][9][10][11]. The stationary slippers allow for interesting sensor placement for example temperature [12,13], pressure [10] or displacement sensors to measure the micro movement and gap height [14][15][16].…”

Section: State Of the Artmentioning

confidence: 99%

Tribological Properties of Different Slipper Designs of an Axial Piston Pump

Horn,

Ivantysyn,

Schmidt

et al. 2024

14th International Fluid Power Conference

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New application areas such as compact drives and displacement control using variable electric motors require that hydrostatic machines exhibit good performance also at very low relative speeds without being damaged during critical mixed friction conditions. While some pumps currently address this issue using leaded metals in their sliding bearings, European regulations (Reach Regulation) mandate the transition to lead-free materials in the near future. To address these challenges, this paper investigates about surface structures that offer the ability to selectively modify the pressure field within the fluid gap, generating additional hydrodynamic pressure. In this research project, various slipper surface structures of an axial piston pump were developed through extensive simulation studies and tested on a pump test-rig as well as on a dedicated hydrostatic tribometer. This paper outlines the development, construction, and optimization of a novel hydrostatic tribometer capable of adjusting speed, pressure, acceleration and temperature. Multiple measurements were conducted with different slipper geometries. The results encompass torque, temperature and wear measurements. They are presented along with a comprehensive analysis and validation of the findings in comparison to simulation and pump test results. In this study the tribometer revealed specific constraints not detected in pump bench tests, underscoring the imperative nature of such examinations.

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Section: State Of the Artmentioning

confidence: 99%

Tribological Properties of Different Slipper Designs of an Axial Piston Pump

Horn,

Ivantysyn,

Schmidt

et al. 2024

14th International Fluid Power Conference

View full text Add to dashboard Cite

show abstract

“…As most of these empirical studies were not performed in an actual pump environment, efficiency tests were infeasible. In the past two decades sensors and electronics have allowed for a less invasive measurement of both gap height and temperature in fully functional pumps [9]- [11], [24], [25], [29]- [32]. However, the findings mostly focused on the validation of simulation models, rather than a pump analysis.…”

Section: Literaturementioning

confidence: 99%

“…To validate the predicted temperature-efficiency trends, it is necessary to measure the cylinder block temperature in a regular pump setting, without modifying crucial pump components, as has been done in the past [9], [29], [38]. To accomplish this, a special telemetric system was used, which can accurately measure a large number of sensors simultaneously.…”

Section: Measurementmentioning

confidence: 99%

Thermal Analysis of the Cylinder Block of an Axial Piston Pump - The Key to Monitoring Efficiency

Ivantysyn,

Weber,

Kunze

et al. 2024

14th International Fluid Power Conference

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To prepare today's fluid power systems for the future digitalization of the industry, it is necessary to improve the information available regarding the current condition of crucial components of the system. Positive displacement machines, which constitute the core of any hydraulic system, play a vital role in this process. Future smart systems will require more information about the current state of the pump such as power usage and efficiency. Current condition monitoring approaches utilize an array of sensors that need to be sampled at high frequency. The transmission, storage, and post processing of this vast amount of data requires an enormous number of resources, especially if exercised at scale. Previous work conducted at the Institute of Mechatronics Engineering at TU Dresden has demonstrated that measuring the temperature in the lubricating gaps can allow for a deeper insight into the tribological mechanisms in these interfaces. Not only can the gap height, viscous friction and leakage be determined from this information, but also crucial information such as wear level and expected component lifespan can be derived from temperature levels with adequate reference models [1]- [4] This paper demonstrates that monitoring the thermal condition of the cylinder block is an effective approach to estimate the pump's efficiency. This will be illustrated through both simulation and measurement, in addition to the pioneering measurement of the heat convection coefficient on the cylinder block surface, a critical boundary condition for the simulation.To measure the temperature of a moving cylinder block, a 160cc axial piston pump was equipped with a telemetric system, which was specially designed and built for this task. Next to the 20 temperature sensors four heat convection coefficient sensors were also carefully placed inside the cylinder block. The resulting measurements did not only validate the simulation but also give a unique insight into the inner workings of a piston pump.

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“…The experimental and theoretical results showed that the extrusion pressure and hot wedge support force were the main factors affecting the oil film thickness and bearing capacity, and the ideal slipper radius ratio and hole length-diameter ratio were obtained by optimizing the structural parameters of the slipper and oil composition. Kazama et al [21] took hydraulic oils with different viscosities and water-glycol hydraulic oil as test fluids and measured the temperatures of the swash plate, valve plate, and cylinder block by a thermocouple under different inlet oil temperatures and viscosities. The test results show that the temperature of the valve plate proportionately increases as the load pressure increases.…”

Section: Introductionmentioning

confidence: 99%

Study on Temperature Characteristics of Lubrication Film of Valve Plate Pair in Axial Piston Pumps

Zhang,

Ma,

et al. 2024

Applied Sciences

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The film temperature distribution of the valve plate pair in axial piston pumps affects its lubrication, leakage, and friction. In order to investigate the film temperature distribution of the valve plate pair in axial piston pumps, a test platform was constructed including three displacement sensors for the oil film thickness and eleven thermocouples for the film temperature distribution of the valve plate pair. An accurate film shape model of the valve plate pair was built according to the three-point film thickness test data. Based on the film shape model, the film temperature model of the valve plate pair was developed considering the viscous oil temperature characteristics, the energy loss caused by leakage and viscous friction in the film, and the heat conduction among the oil, cylinder block, and valve plate. The influence of different swash plate tilt angles and operating pressures on the valve plate film temperature was studied. The test results indicate that the film temperature of the valve plate pair increases as the working pressure and swash plate tilt angle increase. The theoretical and experimental absolute errors of the film temperature in the circumferential range [−60°, 60°] of the valve plate high-pressure side are less than 3.5 °C. As the swash plate tilt angle varies from 12° to 16° and working pressure from 3 MPa to 7 MPa, the minimum film thickness position and the maximum temperature point move accordingly in the circumferential range [−15°, 5°] of the valve plate pair.

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Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

Cited by 7 publications

References 15 publications

Tribological Properties of Different Slipper Designs of an Axial Piston Pump

Tribological Properties of Different Slipper Designs of an Axial Piston Pump

Thermal Analysis of the Cylinder Block of an Axial Piston Pump - The Key to Monitoring Efficiency

Study on Temperature Characteristics of Lubrication Film of Valve Plate Pair in Axial Piston Pumps

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