中文摘要：

由于外界环境及设计制造等因素影响，空间飞行器货舱门锁机构各构件间的运动尺寸会产生变形和误差，引起锁机构运动规律改变，导致锁机构失效。建立了基于各构件尺寸误差的货舱门锁机构运动精度模型，研究了实际工作情况中6个构件尺寸及输入角度误差对机构输出位置的误差影响，给出了货舱门锁机构的运动精度。结果表明：在锁钩工作范围内，锁机构杆1和杆3的尺寸误差对锁钩的理想工作位置影响最大，制造时需对其误差加以控制。

英文摘要：

Because of influences of external environment, design manufacture and other factors, every component＇s transmission size of spacecraft cargo door locking mechanism should produce deformation and error. It should change motion law of locking mechanism and lead to failure. The kinematic accuracy model of cargo door locking mechanism was built based on every component＇s size error. Every eomponent＇s size and error of input angle on er- ror influences of mechanism output position were studied in actual working status. And the kinematic accuracy of cargo door locking mechanism was given. The results show that the size error of locking mechanism＇s bar 1 and bar 3 for latch hook＇s ideal working position has most influence on its working range. So their errors should be con- trolled at machining.