rotates the master lever; the profile of the cam is selected so that it insures the required motion law: immobile in the first part (shock absorption), extension to full equalization in the second, retraction for further coupling in the third. Tn the last portion, the ends of the levers must accurately track the surface of the cone. The roller of the lever slides along the shape of the cone. If there is an “obstruction,” for example, misalignment of the position of the cam, the lever mechanism can be wedged (see Figure 3.8b). The rollers of the levers are coated with a lubricant. To further reduce friction it is also expedient to introduce another degree of freedom of rotation of the roller relative to the transverse axis. Immobile supports are installed on the hull of the docking mechanism, which protects the levers from overloads during shock absorption. Jamming of the socket linkage sensor, like the linkage sensor in the head of the rod of the docking mechanism, may prevent linkage, thus it is expedient to add another compression element. For back-up disengagement, both pyrotechnics and multiple-use mechanisms with an electrical drive are used. Tn the construction with the drive it is desirable for this mechanism to disengage when coupling forces are created by the docking mechanism drive. To decrease the friction created by this force, a mechanism with a rotating lining is used, which is rotated by the electrical drive and which releases four supports with a cam mechanism (see Figure 3.8). For a hermetic implementation of the docking device the socket is covered with a separate hatch which does not absorb loads during shock absorption and coupling. 3.4.2. Peripheral Type Docking Mechanisms The ring with guides has a complex configuration (Figure 3.9) and is subjected to a spatial system of forces. Three main groups of rated cases are decisive: 1) shock absorption before linkage (interaction of guides and impact of the ring with the guide protrusions) (a); 2) shock absorption after linkage (central impact, rotation) (b); 3) coupling by the docking mechanism drive (c).
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