An External Gear Pump with Axial Stepped-gear Structure and Without Additional Trapped-oil Relief-grooves by Wang Hao, Song Anran, Li Yulong

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Output Ripple Difference and Following Lightweight Design of External Gear Pumps and Motors by Wang Hao, Song Anran, Li Yulong

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Large Modulus Method to Effectively Relieve Trapped-oil Phenomenon for Gear-pump and Gear-motor with Equal Displacement by Liu Ping, Li Yulong, Song Anran

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Different Output Ripples of Speed and Torque and Output Ripple Minimization for External Hydraulic Gear-motors by Li Yulong, Hou Xinyu, Zhang Lihua, Song Anran

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