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      저자 : YIN Yaobao (검색결과 2 건)
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      • Erosion Wear Characteristics of Hydraulic Jet Pipe Servovalve

        YIN Yaobao,FU Jiahua,YUAN Jiayang,So-Nam Yun,Yoshito Tanaka 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10

        The situation considered here is that the surface of the spool of jet pipe servo valve is a conical surface that with a certain taper caused by the machining error and the spool mounting with the valve sleeve eccentrically. The models of the contamination wear and the durability life of jet pipe servo valve are established by using the theory of abrasive wear, the maximum allowable leakage of jet pipe servo valve and the distribution of the pollution particles in the hydraulic system. At last the models are verified by an example and the influencing factors of the servo valve contamination wear are analyzed. Results show that mathematical models are well agreed with wear processes, and durability life meets the national standard. At the same time, the durability life of jet pipe servo valve is longest when the spool has no eccentricity and taper. While the surface of the spool of jet pipe servo valve has a certain taper caused by the machining error and the spool mounting with the valve sleeve eccentrically, the durability life of jet pipe servo valve is the shortest. The results are useful for the prediction and calculation of wear and durability life of jet pipe servo valve and have an important role on the anti-wear design of jet pipe servo valve.

      • Characteristics of Compacted Two Stage Relief Valve with Damping Orifice between Main Valve and Pilot Valve

        Yin Yaobao,Yuan Jiayang,Li Jing,So-Nam Yun,Yoshito Tanaka 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10

        A new type of compacted two-stage relief valve is introduced in this paper. The two-stage relief valve has a series damping orifice between main valve and pilot valve, and has a better dynamic characteristics than ordinary valve in engineering, but theoretical guidance for design process is lacking. Mathematical model of compacted two-stage relief valve with damping orifice between main valve and pilot valve is established and the characteristics of different type orifices are studied. Theoretical study shows damping orifice decrease the open loop gain of pilot valve; so the pilot valve is more stable and the dynamic characteristics of the whole valve are better than ordinary. Moreover, thin-wall orifice instead of tenuous orifice provides a greater damping coefficient and improves the stability of pilot valve more effective, so thin-wall orifice is recommended. The mathematical model is validated by experiments.

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