36results about "Stern posts" patented technology

A device (100), for the checking and measurement of the journal bearing clearance between the outer bearing on the rudder shaft (25) of a rudder for water-borne craft and the inner bearing (32) on the rudder trunk (20) corresponding with the outer bearing (31), is characterised by a measurement rail (70) made of a springy elastic material having internal stiffness, which can be introduced by means of a guide rail (60), provided with a grip-type handle (61), into the gap between the outer bearing and the inner bearing and hence into the clearance measurement region, with a measurement probe (80) located at its free end (70a) for the clearance width measurement, wherein the measurement rail (70) with the measurement probe (80) with a prescribed thickness (a) are exchanged for measurement rails with measurement probes with other thicknesses until the achievement of an agreement of the clearance width with the thickness of a measurement rail (70) with the measurement probe (80).

The invention discloses a sharp-bilge planing boat type with constant wetted length. A boat body curved surface is a fairing space closed curved surface formed in a controlling mode with a designed water line, a midship longitudinal section line, an angle folding line, an upper boundary line, a stern transverse section line, a midship section line, a folding angle line longitudinal inclined angle, a stern inclined rising angle and a midship inclined rising angle as characteristics. The sharp-bilge planing boat type has the advantages that the wetted length is constant and unchanged no matter how the ship state changes at various kinds of ship speed; the resistance performance is greatly reduced than that of a traditional planing boat when sailing in states of water draining, transiting and taking off; the resistance performance is close to that of the traditional planing boat when sailing in a planing state; maneuverability, seaworthiness and seakeeping are greatly improved. The sharp-bilge planning boat type can be used in sea conditions 1-2 grades higher than the traditional planing boat. Further, due to the fact that the wetted length remains unchanged, the sharp-bilge planning boat type is more favorable for people to utilize the length Froude number to analyze and study the performance of the sharp-bilge planning boat type theoretically.

The invention relates to a rudder for ships with propeller drive, in which the propeller is arranged to rotate about a propulsion axis, with a rudder blade (15) and a flow body (20) arranged on the rudder blade (15), whereby the flow body designed in a bulb or zeppelin shape is arranged as an extension of the propulsion axis in the region of the rudder blade and is designed to self-destruct or self-detach in the event of an increase in the effect of force, blow, impact or pressure.

In order to achieve a connection between a nozzle shaft (20) and a nozzle ring (10) that has the simplest design possible, while at the same time being stable, in a propeller nozzle (100) for a watercraft which comprises a fixed propeller (30) and a nozzle ring (10) surrounding the propeller (30), said nozzle ring being pivotable by means of a nozzle shaft (20), the nozzle shaft (20) is designed as a hollow body.

A propeller arrangement (100) for a marine vessel, the propeller arrangement (100) comprising a propeller (110), a propeller shaft assembly (120) comprising a shaft portion (122) extending from a distal side of the propeller (111), a support member (130) arranged to be connected to a hull (2) of the marine vessel, and a bearing arrangement (140) interconnecting the support member (130) and the shaft portion (122). The propeller arrangement is characterized in that the support member (130) comprises at least one cooling fluid conduit (131 ) for accommodating and circulating a first cooling fluid within the support member (130) and further to the shaft portion (122) and/or to the bearing arrangement (140).

The present invention relates to a stern tube bush unit. When assembling the stern tube bush unit onto a hull, the rear surface of the stern of the hull and the rear surface of a first bush housing are disposed on the same plane, for coupling, and a rubber sponge is mounted between the bush housing and the hull for retaining sealing resin. Therefore, it is possible to increase the use of space at the rear side of the stern of the hull, and increase the sealing force of the resin which is filled between the hull and the bush housing. In addition, it is possible to firmly mount the stern tube bush unit at the precise position in the hull through a stable structure in a short time.

The invention provides a manufacturing method of a large tail casting structure of a ship. The manufacturing method includes the following steps that the large tail casting structure of the ship is transversely broken to form an upper part and a lower part, and the upper part and the lower part are cast separately; a jaw-shaped connecting frame is arranged between the upper part and the lower part; and the upper part and the lower part are welded to the jaw-shaped connecting frame to form the tail structure of the ship. By means of the manufacturing method, a large casting can be precisely machined, the manufacturing period is short, and the cost is low.

This invention discloses a ship comprising an upper part, a middle part and a head part of a lower part. In the front section, the width of the upper part is decreased in an upward direction; in the front section, the middle part has constant width or the width is changed within a predetermined range; and in the front section, the width of the lower part is decreased in a downward direction; and the lower part is coupled to the bottom of the ship, and the head part is formed in a rearward direction and is formed in a predetermined range from the ship head to the upward direction.

A stern operatively mounted universal transducer for boat includes a mounting device, having upper and lower brackets, for securement to the boat, preferably its transom, the upper and lower brackets secure a drive cylinder, which when operative, lowers a drive rod for shifting a sonic transducer upwardly above the water, or downwardly into the water to scope the surrounding underwater typography. A pair of guide rods shiftably extend through the upper and lower brackets, and at their upper ends, secure to a motor and gear housing, the guide rods at their lower ends secure to a base plate. A transducer shaft extends into the motor housing which provides for its pivoting, and at its lower end, extends downwardly through the base plate, and secures a transducer mounting plate, to which the transducer is affixed, in preparation for its usage. Electrical, pneumatic, or hydraulic pressure can be used to pivot the transducer shaft, and to raise and lower the base plate that connects with the drive shaft, the latter when operative, raises or lowers the entire transducer assembly into and out of the water, during application.

The invention discloses a ship stern post, which comprises an outer plate, a shaft hub and round steel, and one end of the shaft hub extends out of the outer plate and is used for being connected with a propeller of a ship; the round steel extends along the outer contour line of the outer plate; the outer plates comprise the first outer plate and the second outer plate, the end face of the first outer plate and the end face of the second outer plate are connected with the outer wall of the round steel, and the diameter of the round steel is larger than the wall thickness of the first outer plate or the second outer plate. By adopting the invention, the tail end connecting position of the outer plate is moved forwards, namely, the connecting position of the original middle longitudinal section is moved to the position tangent to the outer edge of the round steel. According to the structure, the internal operation space of the ship body is increased, and the construction manufacturability is effectively improved. In addition, the round steel replaces a part of the outer plate, correspondingly, the size of the outer plate is reduced, and therefore the machining difficulty of the outer plate is lowered, especially the outer plate with the tail portion provided with bidirectional curvature.

An asymmetrical stern structure of a ship includes the hull, A stern is arranged at the bottom of the hull, A longitudinal section of that stern of the ship is in the shape of a dagger, the longitudinal centerline of the stern of the ship is shifted toward one side of the hull, the stern of the ship comprises a hub cast steel piece, the hub steel casting includes an integrally formed first portionand a second portion, A lateral cross-section of that first portion and the second portion are U-shape and opposite in direction, A longitudinal section of that first portion is rectangular and radiated at both ends; At first, that width of the longitudinal section of the second part increase and then decreases along the longitudinal cent line, A tail shaft of a propeller is arrange in that middle of the shaft hub cast steel part, the tail shaft of the propeller is positioned on the longitudinal centerline of the hull, and the front end of the tail shaft of the propeller is provide with a stern tube front support. The invention has the advantages of simple structure, reducing ship resistance, improving propulsion efficiency, reducing oil consumption and saving energy.

The invention discloses a line type of a supervise boat. A V-shaped break angle line type is adopted. The supervise boat comprises a main boat body. A rib frame composed of a plurality of ribs is arranged in the main boat body. Two watertight cabin walls are arranged at the positions #0 and #8 and divide the main boat body into a tail tip cabin from the stem to the position #0 and a passenger compartment and a cockpit from the position #0 to the position #8. A head tip cabin is arranged from the position #8 to the bow. A flat barge line type with a break angle is adopted for the stem. Ship sides on the two sides are transited to the bow in an upwarp mode. The rib frame structures of all parts on the ship sides are different. The structure of the line type of the supervise boat is optimized, and the wave-making resistance and viscous resistance of the boat body are effectively reduced.

The invention discloses an open tunnel ship type reversing performance enhancement method and device. In order to form a tail-closed structure similar to a closed tunnel at the tail of a ship body, one device needs to be added, a closed space can be formed at the tail of an open tunnel during reversing, air in the upper portion of the tunnel is evacuated to form vacuum, the closed space sucks water and is filled with the water, and all screw propellers are immersed in the water during reversing. The device needs to be opened during advancing, and backward drainage of the tunnel cannot be affected. The requirements are combined, a turnover baffle plate is additionally mounted at the back of a tail sealing plate and pushed open by backward water flow during advancing, and the shape of the open tunnel is ensured. The reversing performance enhancement device with simple structure, high efficiency and low cost is provided for shallow draught ships constrained, controllability of open tunnelships can be effectively improved, and the low-priced device for efficiently enhancing ship reversing performances can be provided for future similar ships by project implementation.

A vessel for operation on a water surface, having a hull that creates a waveform that attracts aquatic animals such as dolphins when traveling at a speed of 9 to 13 knots. The hull comprises a bow, a rounded stern and a midship section extending from the bow to the stern. The hull has a ratio of a waterline beam to a radius of the stern in a range between 2.0-2.5, and a speed-to-length ratio in a range between 1.5-1.7 to create a soft, curling wake in which dolphins can surf and jump. The hull further has a length-to-beam ratio between 2.5 to 3.0, a flat bottom aft, a high deadrise at the bow, and a full midsection with a longitudinal center of gravity located 52% to 56% aft of a beginning of a waterline to result in a low prismatic coefficient of the hull.