Screw propeller with safety coupling

A screw propeller with a safety coupling comprising:

• a screw propeller body-cum-hub, a driving coupling, mounted on a propeller shaft and receiving a torque from the propeller shaft, a driven coupling, connected with the screw propeller body-cum-hub for the transmission of torque to the screw propeller, a dowel pin for transmission of the torque between the driving coupling and the driven coupling, a common opening for the dowel pin, which is oriented along an axis of the propeller shaft and passes through an end surface of the driving coupling and the driven coupling, wherein the driven coupling is disposed partially or fully in an opening in the screw propeller body-cum-hub and consists of two parts divided transversely to a longitudinal axis and connected together in the axial direction, with it the parts of the driven coupling with its end surfaces or provided collars-ledges rest on adjacent end surface or internal collar of the opening of the screw propeller body-cum-hub, that way the screw propeller body-cum-hub is fixed between the parts of the driven coupling in the axial direction.

A screw propeller with a safety coupling comprising:

• a screw propeller body-cum-hub, a driving coupling, mounted on a propeller shaft and receiving a torque from the propeller shaft, a driven coupling, connected with the screw propeller body-cum-hub for transmission of the torque to the screw propeller, a dowel pin for transmission of the torque between the driving coupling and the driven coupling, a common opening for the dowel pin, which is oriented along an axis of the propeller shaft and passes through an end surface of the driving coupling and the driven coupling, wherein the opening for the dowel pin in the driving coupling and the driven coupling is configured as a transverse opening, and the blind end of the opening for the dowel pin is connected by a transverse opening to the outside surface of the coupling.

A screw propeller with a safety coupling comprising:

• a screw propeller body-cum-hub, a driving coupling, mounted on a propeller shaft and receiving a torque from the propeller shaft, a driven coupling, connected with the screw propeller body-cum-hub for transmission of the torque to the screw propeller, a dowel pin for transmission of the torque between the driving coupling and the driven coupling, a common opening for the dowel pin, which is oriented along an axis of the propeller shaft and passes through an end surface of the driving coupling and the driven coupling, a damper in the driving coupling is made of two coaxial bushings with an annular gap between them, the bushings of the damper have thrust exposed elements on the surface, a damping element is disposed in an annular segmental space between the bushings and the thrust elements, wherein the driving bushing and the driven bushing of the damper has a longitudinal groove-slot for the thrust element on the surface facing to the annular gap, the longitudinal groove-slot and the thrust element in cross section has a shape of a circle or a circle segment.

A screw propeller with a safety coupling comprising:

• a screw propeller body-cum-hub, a driving coupling, mounted on a propeller shaft and receiving a torque from the propeller shaft, a driven coupling, connected with the screw propeller body-cum-hub for transmission of the torque to the screw propeller, end, trapezoidal splines on end face of the driving coupling and the driven coupling, a dowel pin for transmission of the torque between the driving coupling and the driven coupling, a common opening for the dowel pin, which is oriented along an axis of the propeller shaft and passes through an end surface of the driving coupling and the driven coupling, a stopping nut on the end of the propeller shaft, wherein during transmission of the torque using the end, trapezoidal splines between the driving coupling and the driven coupling, the end, trapezoidal splines keep the contact by side surfaces in the geometric field during turning around the longitudinal axis of rotation and the beginning of side faces slide relative to one another with simultaneous movement of the driving coupling and the driven coupling from each other along the axis.