Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (11): 79-84.doi: 10.3969/j.issn.1000-565X.2013.11.013

• Mechanical Engineering • Previous Articles     Next Articles

Speed- Switching Characteristics of Hydraulic Motor of Excavator with Shift Valve

Tang He- sheng Yin Yao- bao Wang Kang- jing   

  1. College of Mechanical Engineering,Tongji University,Shanghai 200092,China
  • Received:2013-03-13 Revised:2013-07-26 Online:2013-11-25 Published:2013-10-11
  • Contact: 訚耀保(1965-)，男，教授，博士生导师，主要从事流体传动及控制基础理论研究． E-mail:y-yin@tongji.deu.cn
  • About author:汤何胜(1985-)，男，博士生，主要从事液压泵/马达设计研究．E-mail:tanghesheng321200@163．com
  • Supported by:

    国家自然科学基金资助项目(51175378， 51275356);国家科技支撑计划资助项目(2011BAJ02B06);航空科学基金资助项目(20120738001， 20128038003)

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Abstract:

In order to meet the variable speed drive requirements of the hydraulic motor of excavators under com-plex operation conditions,a variable speed control system with a shift valve was designed for the hydraulic motor.Then,the system model of the hydraulic motor was established,and the effects of some main parameters,such asthe diameter of the damper orifice at the pilot pressure port,the initial displacement of the valve spool,the diame-ter of the damper orifice at the valve pool and the spring stiffness,on the speed- switching stability,were analyzed.Theoretical and experimental results show that (1) setting a damper orifice at the pilot pressure port helps to im-prove the commutation performance of the shift valve and shorten the speed- switching time of the motor; (2) the ini-tial displacement of the valve spool,the diameter of the damper orifice and the spring stiffness all remarkably influ-ence the speed- switching stability of the hydraulic motor; and (3) the calculated results obtained by the theoreticalmodel accord well with the experimental ones.

Key words: excavators, hydraulic motors, variable speed drive, speed control

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