After analyzing the limitation of the conventional unload groove, this article puts forward the duple unload groove which can eliminate the phenomenon of oil-trap completely.

• 本文分析了齿轮泵常规卸荷槽消除齿轮泵困油压力的设计局限性,提出能完全消除齿轮泵困油压力的双重卸荷槽,并分析其设计原理,同时介绍了其具体设计过程。