Gear rotor for gear pump and design method of gear rotor

The invention discloses a gear rotor for a gear pump. The rotor is composed of a left gear rotor body (1) and a right gear rotor body (2) which can be engaged with each other. Each gear rotor body comprises six to twelve teeth. A left end profile line (101) is composed of four curves which comprise two segments of arcs, one segment of transition curve and one segment of conjugate curve. A right end profile line (201) is composed of four curves which comprise two segments of arcs, one segment of transition curve and one segment of conjugate curve. The gear rotor for the gear pump has a simple forming profile line, the design optimization is facilitated, and the left gear rotor body (1) and the right gear rotor body (2) can achieve complete and correct engagement; and the fluid leakage from a high-pressure chamber to a low-pressure chamber can be effectively reduced during the working process, no closed capacity reduction process is generated, and no trapped liquid phenomenon is generated. 本发明公开了一种合齿轮泵的齿轮转子，该转子