The conventional transmission mechanism of disconnector is a cross four-bar linkage mechanism

and its hinge clearance reduces transmission precision of the mechanism. This work models the cross four-bar linkage mechanism based on the continuous contact model

and solves the error of passive crank rotation angle usingMATLAB. Result shows that when the hinge clearance reaches 4 mm

the error value of the passive crank rotation angle is nearly 4°

resulting in 26.5 mm in position offset of the conducting arm. And the position offset increasesapproximately linearly with the hinge clearance. Further

a new bevel gear transmission mechanism is proposed

andMonte Carlo method is employed to analyze its transmission precision. Result indicates that the mean transmissionangle error of the new mechanism is only 0.001°

and its transmission precision is raised by more than 99%compared with the conventional cross four-bar linkage mechanism

which is beneficial for disconnector opening and closing accurately.