Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
  • B63H25/06—Steering by rudders
  • B63H25/38—Rudders
  • B63H25/382—Rudders movable otherwise than for steering purposes; Changing geometry
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
  • B63H25/06—Steering by rudders
  • B63H25/38—Rudders
  • B63H25/382—Rudders movable otherwise than for steering purposes; Changing geometry
  • B63H2025/384—Rudders movable otherwise than for steering purposes; Changing geometry with means for retracting or lifting
  • B63H2025/386—Rudders movable otherwise than for steering purposes; Changing geometry with means for retracting or lifting by sliding, e.g. telescopic

Definitions

• the invention concerns a device for mounting a rudder in a drum which is mounted rotatably about its longitudinal axis in a hull of a vessel, wherein the rudder is movable along its and substantially also the drum's longitudinal axis, an end wall of the drum is substantially aligned with a section of a skin of the hull and the rudder can be moved between a first position, wherein it is substantially withdrawn into the drum, and a second position, wherein it extends substantially outside the drum and away from the hull and projecting in relation to the end wall.
• WO 93/24363 there is disclosed a rudder which is mounted in a drum in this manner.
• the drum In order to prevent penetration of water into the hull, the drum may be closed at its inner end, i.e. the end which faces into the hull and sealing devices may be provided between the drum and the hull.
• the fluid which flows around the rudder during running of the vessel gives rise to substantially transverse forces and bending moments which have to be transferred to the hull via the drum.
• the rudder must be designed to be capable of also withstanding other stresses.
• the rudder In the known rudder mounting device the rudder is disposed slidably in the drum, with areas of the drum and the rudder constantly overlapping one another. The transfer of forces as well as bending moments from the rudder to the drum is thereby ensured. In order to ensure the absorption of the maximum bending moments which occur when the rudder is pushed out of the drum to its maximum projecting position, however, these overlapping areas have to be relatively long.
• the section of the rudder which then projects into the drum cannot therefore be employed for steering the vessel, and in order to enable the rudder to be withdrawn completely into the drum it must have a length which at least corresponds to the length of this section and the length of the projecting section. The drum therefore projects a considerable distance into the hull, requiring a great deal of space.
• the object of the invention is to provide a device of the type mentioned in the introduction, which is not encumbered with this drawback.
• Fig. 1 shows a section through a drum with a thereto connected rudder according to a first embodiment of the device according to the invention.
• Fig. 2 shows a cross section along line II-II in fig. 1.
• Fig. 3 shows a longitudinal section through the drum and the rudder along line III-III in fig. 1.
• Fig. 4 shows a section like that in fig. 1 through a rudder assembly comprising two telescopic rudder sections according to a second embodiment of the device according to the invention.
• a circular cylindrical drum 6 which can rotate in the cavity 2 in bearings 8, 10. Between the hull 4 and the drum 6 there is provided a sealing device 12.
• the drum has an end wall 14 which closes the drum 4 at its inner end, i.e. the end which projects into the hull, and an outer end wall 16 which is substantially aligned with a skin 18 of the hull 4.
• a through-going opening 20 through which there extends a cylindrical rudder 22 which can slide in its longitudinal direction through the opening 20.
• the expression axial direction will hereinafter be understood to mean this longitudinal direction and the expression transverse direction will be understood to mean directions across the axial direction unless otherwise specified.
• a first mounting device 24 which is composed of a section of the outer end wall 16 at the opening 20 is arranged to support the rudder 22 laterally, i.e. to absorb forces which are exerted by the rudder against the end wall 16 in the rudder's transverse direction.
• the inner end wall 14 may be connected to devices (not shown) whereby the drum can be rotated for steering the vessel.
• an axial blind bore 26 which is open at the rudder's inner end.
• the bore 26 has a narrowed section or nut section 28 which has an inner thread in which an axially extending screw 30 is screwed.
• the screw 30 is mounted in the inner end wall 14 of the drum 6, thus enabling the screw 30 to rotate freely about its longitudinal axis.
• a first chain wheel 32 is rotationally rigidly connected with the screw 30.
• a motor 34 which is preferably an electric motor.
• a second chain wheel 36 Around the chain wheels 32. 36 there extends a chain 38.
• the motor may be supplied with electricity via wires (not shown) which extend sealingly through the drum wall without preventing rotation of the drum 6.
• wires not shown
• the screw 30 can be rotated via the chain wheels 32, 36 and the chain 38 for axial movement of the rudder 22.
• the rudder 22 there are also provided two additional blind bores 40, 42 (see fig. 3) which extend on each side of the bore 26 for the screw 30, and which are open at the rudder's inner end.
• a screw 44, 46 is inserted with a through-going, axial bore 48, 50, whose outer end forms an outwardly facing shoulder 52, 54.
• a recess 56, 58 In the inner end of each screw 44, 46 and in the inner end section of the rudder 22 there is provided a recess 56, 58.
• each bore 40, 42 there extends a rod 60, 62 with a rod section 64, 66, the outer end of which is connected to a head 68, 70.
• the rod section 64. 66 extends slidably in the axial bore 48, 50 of the respective screws 44, 46.
• the rods' heads 68, 70 are arranged to abut against the shoulders 52, 54 for carrying the rods 60, 62 when the rudder 22 is moved out of the drum 6.
• each of the rods 60, 62 is securely attached to a yoke 72, 74 (see fig. 2) which extends across an axial symmetry plane P for the rudder 22.
• Each yoke and associated rods constitutes a carriage device.
• the end sections of each yoke 72, 74 has radial bearings 76, 78, 80, 82 which are arranged to be slidably moved on respective axially extending guide rods 84, 86, 88, 90, the ends of which are attached to the drum's end walls 14, 16.
• the guide rods constitute a guide device for the carriage device. In order to ensure that the rods 60, 62 are not moved too far against the drum's outer end wall 14, e.g.
• additional yoke sections may be provided which securely connect the yokes 72, 74 to each other.
• the mode of operation of the device is as follows, assuming that the fact that the rudder 22 initially has been pushed into the drum 6. In this position of the rudder the recesses 56, 58 receive adjacent sections of the yokes, thus enabling the rudder to be pushed the maximum distance up into the drum.
• a drum 100 which is arranged for rotation in a vessel hull 102.
• a first cavity 104 which is provided in the drum 100 and which is open away from the interior of the hull, and leads into the vessel's skin, there is provided a first rudder section 106 which is arranged to slide in its longitudinal direction, i.e. axially in the cavity 104. The direction inwards into the hull will hereinafter be described as upwards.
• a second rudder section 1 10 which is arranged to slide axially in the same direction as the first rudder section 106.
• a blind hole 1 12 which is open at the top.
• a nut section 1 14 into which there is screwed a screw 116, whose lower end section may extend into the blind hole 1 12, and whose upper end section is connected to the rotor of a motor 1 18, e.g. an electric motor, which is attached in the second cavity 108 and to the upper end section of the first rudder section 106.
• the second rudder section can thus be moved in or out of the first rudder section by rotation of the motor's rotor one way or the other.
• a rudder comprising telescopic rudder sections similar to that described here may be employed with rudders of the known type or with rudders of the type which is illustrated in figures 1 - 3.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Toys (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19900315

Family Applications (1)

Country Status (4)

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Family Cites Families (2)

• 1997
  • 1997-01-30 NO NO970413A patent/NO303974B1/no not_active IP Right Cessation
• 1998
  • 1998-01-30 WO PCT/NO1998/000033 patent/WO1998033703A1/en not_active Application Discontinuation
  • 1998-01-30 EP EP98902311A patent/EP0956235A1/en not_active Withdrawn
  • 1998-01-30 AU AU58870/98A patent/AU5887098A/en not_active Abandoned

Non-Patent Citations (1)

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