Rotatory steerable drilling instrument actuating mechanism of static directional formula

The utility model provides a rotatory steerable drilling instrument actuating mechanism of static directional formula, belongs to rotatory steerable drilling instrument technical field, and this actuating mechanism includes casing (1) and transmission shaft (2), and casing (1) is connected through joint linkage unit (4) with transmission shaft (2), and the anterior of casing (1) is connected through sealing unit (5) with transmission shaft (2), and sealing unit (5) are used for keeping apart joint linkage unit (4) and drilling fluid, sealing unit (5) include at least one sealed spherical contact surface, and spherical contact surface has the same central centring point (P) with joint linkage unit (4). 种静态指向式旋转导向钻井工具执行机构，属于旋转导向钻井工具技术领域，该执行机构包括壳体(1)和传动轴(2)，壳体(1)与传动轴(2)通过关节连接单元(4)连接，壳体(1)的前部与传动轴(2)通过密封单元(5)连接，密封单元(5)用于将关节连接单元(4)与钻井液隔离；密封单元(5)包括至少个密封的球形接触面，球形接触面与关节连接单元(4)具有相同的中心枢点(P)。