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Simultaneous temperature measurements of bearing and seal parts of a swash plate type axial piston pump — effects of piston clearance and fluid property

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Abstract

Temperatures of three bearing and seal parts of a swash plate type axial piston pump were measured simultaneously using a slip ring with thermocouples’ amplifiers. The rotating cylinder block had five thermocouples, the swash-plate had four, and the valve-plate had four. Three sets of pistons with different diameters were prepared. Hydraulic mineral oil with VG22 and a water-glycol type hydraulic oil with VG32 were used as test fluids. The maximum discharge pressure was 20 MPa; the maximum rotational speed was 25 rps. The inlet oil temperature was 20–40°C. Temperatures and temperature differences between the bottom-dead-center and the top-dead-center increased concomitantly with the discharge pressure. For larger piston clearance ratios, the temperatures rose monotonically. The bearing and seal parts were markedly hotter than the discharge oil. Temperatures rose much less using the water-glycol type oil than when using the mineral oil.

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References

  1. T. Kazama and T. Tsuruno, Thermal lubrication characteristics of swash-plate type axial piston pumps (Temperature measurement of swash-plate and cylinder-block), Transactions of Japan Society of Mechanical Engineers, C74(738) (2008) 425–430, (in Japanese).

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  2. T. Kazama, T. Tsuruno and H. Sasaki, Temperature measurement of tribological parts in swash-plate type axial piston pumps, Proceedings of the 7th JFPS International Symposium on Fluid Power, TOYAMA 2008 (2008) P1/16.

  3. T. Kazama and H. Sasaki, Thermal lubrication characteris tics of swash-plate type axial piston pumps (Simultaneous measurement of temperatures in cylinder-block, swash-plate and valve-plate), Transactions of Japan Society of Mechanical Engineers, C75(758) (2009) 2797–2802, (in Japanese).

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Correspondence to Toshiharu Kazama.

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Toshiharu Kazama received his B.Eng. and M.Eng. degrees from Yokohama National University, Japan, respectively in 1986 and 1988. He received his Ph.D. degree in 1994. Dr. Kazama is a Professor at the College of Design and Manufacturing Technology, Graduate School of Engineering, Muroran Institute of Technology in Hokkaido, Japan. His research interests include fluid power, tribology, and machine design.

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Kazama, T., Sasaki, H. & Narita, Y. Simultaneous temperature measurements of bearing and seal parts of a swash plate type axial piston pump — effects of piston clearance and fluid property. J Mech Sci Technol 24, 203–206 (2010). https://doi.org/10.1007/s12206-009-1162-1

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  • DOI: https://doi.org/10.1007/s12206-009-1162-1

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