Design and Development of Compact Ceramics Reinforced Pump with Low Internal Leakage for Electro-Hydrostatic Actuated Robots

  • Mitsuo KomagataEmail author
  • Tianyi Ko
  • Yoshihiko Nakamura
Conference paper
Part of the Mechanisms and Machine Science book series (Mechan. Machine Science, volume 73)


In this paper, we developed a compact pump reinforced by ceramics structure. In order to reduce the internal leakage, we developed a ceramics reinforcer for the pump-casing to suppress the deformation of the casing under high pressure, and devised the structure using bearing balls which can adjust the gap between the gear and the casing precisely. To evaluate the internal leakage, we used the internal leakage resistance which indicate the difficulty of internal leakage. Internal leakage resistance of developed pump is 3.39 × 1013Pa·s/m3 which means that the internal leakage loss of developed pump is 1/2.8 times that of previously developed pump.


hydraulic EHA pump ceramics 


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  1. 1.
    Habibi, S., Goldenberg, A.: Design of a new high-performance electrohydraulic actuator. in IEEE/ASME Transactions on Mechatronics. vol.5, pp.158-164, Jun, 2000. Scholar
  2. 2.
    Pratt, G.A., Williamson, M.M.: Series elastic actuators. in Proceedings 1995 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human Robot Interaction and Cooperative Robots. vol.1, pp.399-406, 5-9 Aug, 1995, Pittsburgh, PA, USA.
  3. 3.
    Kaminaga, H., Ko, T., Masumura, R., Komagata, M., Sato, S., Yorita, S., Nakamura, Y.: Mechanism and Control of Whole-Body Electro-Hydrostatic Actuator Driven Humanoid Robot Hydra, International Symposium on Experimental Robotics, No.57, 3-6 October, 2016, Tokyo, Japan. Scholar
  4. 4.
    Kaminaga, H., Ko, T., Yorita, S., Sato, S., Masumura, R., Komagata, M., Ishikawa, T., Miyatake, T., Nakamura, Y.: Enhancement of Mechanical Strength, Computational Power, and Heat Management for Fieldwork Humanoid Robots, 16th IEEE RAS International Conference on Humanoid Robots, pp.786-793, 15-27 November, 2016, Cancun, Mexico.
  5. 5.
    Komagata, M., Ko, T., Nakamura, Y.: Small Size Hydraulic Pumps with Low Heat Generation for Electro Hydrostatic Actuation of Humanoid Robots, in Proceedings of IEEE-RAS International Conference on Humanoid Robots, pp.483-488, 6-9 November, 2018, Beijing, China.Google Scholar
  6. 6.
    Navarro, R.: Performance of an Electro-Hydrostatic Actuator on the F-18 Systems Research Aircraft, December, 1997.Google Scholar
  7. 7.
    ISO 3290-1:2014, Rolling bearings – Balls – Part 1: Steel balls.Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Mitsuo Komagata
    • 1
    Email author
  • Tianyi Ko
    • 1
  • Yoshihiko Nakamura
    • 1
  1. 1.Graduate School of Information Science and TechnologyThe University of TokyoBunkyo, TokyoJapan

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