SEA-GOING ICE-BREAKING TRANSPORT VESSEL AND PROPULSION- AND-STEERING COMPLEX FOR THIS VESSEL Russian patent published in 2008 - IPC B63B35/08 B63H20/00 

FIELD: water transport facilities.

SUBSTANCE: proposed sea-going ice-breaking transport vessel has hull with keel, forecastle with deck house, fore pointed extremity, aft convex cochleariform lines, aft deck and propulsion-and-steering gears. Hull is additionally provided with flat bulb considerably projecting beyond fore perpendicular. Fore lines are made with U-shaped frames over entire height of side including forecastle superstructure with streamlined deck house; keel is rising in sternpost area; when it is stowed, its lower aft wedge-shaped edge projects beyond sternpost line. Aft cochleariform lines form section of deck which is oval in plan with transom inclined at angle of 45 deg. In underwater portion, lines smoothly change into side bulges-sponsons provided with passageways with longitudinal slots in their bottom part for motion of propulsion-and-steering gears over them. Side bulges-sponsons terminate in falling-out side on external side and falling-home side in their fore part so that line of maximum breadths in this area directed upward and sternward should cross the waterline at angle of 3-6 deg. Extreme breadth of hull over bulges-sponsons in the waterline area exceeds midship breadth. Bottom part of passageway has horizontal or slightly deadrise surface in cross-sections which passes to stern at angle of 1-3 deg. relative to waterline and extends to deck at angle of 45 deg. On both sides of its oval section made in form of shoulder perpendicular to hull CL. Propulsion-and-steering gear includes two all-moving struts with nacelles located in aft section of ship, motors in nacelles for rotating the propellers and load-bearing service lines running to struts from power module of vessel. Struts with nacelles are located on both parts of stern in bulges-sponsons. Each strut with nacelle has streamlined guide stud in form of spherical segment with base directed upward which is equipped with circular thrust sliding bearing over its perimeter; each strut has vertical shaft which is coaxial with segment and is rotated by motor in radial-thrust bearing of carriage located in passageway of bulge-sponson and driven by means of load-bearing service lines on four bevel gear wheels connected in pairs by means of transversal hydraulic cylinders of carriage and driven by hydraulic motors built in them; hydraulic motors are thrown into engagement with inclined toothed racks laid on either side from slot in bottom part of passageway. Width of this slot is equal to diameter of vertical shaft.

EFFECT: enhanced ice passability of vessel.

3 cl, 7 dwg