The invention discloses a single-side driving and synchronous transmission double-hook electric chain hoist. Comprising a left reduction gearbox supporting an input gear shaft, a motor fixed on a right reduction gearbox, a right hoisting chain wheel which is supported on the right reduction gearbox and is provided with a toothed central rotating shaft in a penetrating manner, a right last-stage gear in spline connection with the chain wheel, a left hoisting chain wheel supported in the left reduction gearbox and a left last-stage gear in spline connection with the chain wheel, and a rotor shaft is fixed with the toothed central rotating shaft; a speed reduction friction transmission mechanism is arranged between the tooth part of the toothed central rotating shaft and the right final-stage gear and comprises a speed reduction gear shaft supported on the right reduction gearbox, a speed reduction gear mounted on the speed reduction gear shaft, a friction plate, a friction pressure plate with an internal spline and a disc spring with preset elastic force, and the tooth part of the toothed central rotating shaft is meshed with the speed reduction gear; a tooth portion of the speed reduction gear shaft is meshed with the right last-stage gear, the speed reduction gear shaft and the input gear shaft are respectively connected with the transmission shaft, and a tooth portion of the input gear shaft is meshed with the left last-stage gear. After the mechanism is adopted, the double lifting hooks synchronously ascend and descend, and overload limiting transmission is carried out on the two reduction gearboxes.

本发明公开了一种单侧驱动同步传动的双钩环链电动葫芦，包括支承有输入齿轴的左减速箱、固定在右减速箱的电机、支承在右减速箱且穿置有带齿中心转轴的右起重链轮及该链轮花键联接右末级齿轮、支承在左减速箱内的左起重链轮及此链轮花键联接左末级齿轮，转子轴与带齿中心转轴固定，带齿中心转轴的齿部与右末级齿轮之间设减速摩擦传动机构，包括支承在右减速箱的减速齿轴、安装在减速齿轴的减速齿轮、摩擦片、带内花键的摩擦压盘和预设弹力的碟簧，带齿中心转轴的齿部啮合减速齿轮，减速齿轴的齿部啮合右末级齿轮，减速齿轴、输入齿轴分别与传动轴连接，输入齿轴的齿部啮合左末级齿轮。采用该机构后，双吊钩同步升降，且对二减速箱超载限制传动。