Steering arrangement for a ship propelled by waterjet
The present invention relates to a steering arrangement for ships propelled by water jet, comprising a steering device ( 6 ) that is pivotal about an essentially vertical shaft ( 5 ) having a first center line (C 1 ), at least one hydraulic cylinder ( 2; 3 ) for turning said steering device ( 6 ), which hydraulic cylinder is directly or indirectly articulately connected to the ship's body at one of its ends ( 2 B; 3 B), a turning device ( 4 ) connected to said shaft ( 5 ), for attachment to a second end ( 2 A; 3 A) of said hydraulic cylinder at a distance from said shaft ( 5 ), a reversing device ( 7 ) arranged in connection with said steering device ( 6 ) about an essentially horizontal shaft ( 12 ), an additional hydraulic cylinder ( 9 ) arranged to act on the reversing device ( 7 ), the additional hydraulic cylinder ( 9 ) following the movement of the steering device ( 6 ), characterized in that all the hydraulic cylinders ( 2,3,9 ) are arranged within a sheltered space ( 1 ) located above the extension of said vertical shaft ( 5 ), which space ( 1 ) is accessible for maintenance from the inside of the ship, and in that the arranging of said hydraulic cylinder ( 9 ) at the turning device ( 4 ) in relation to the steering device ( 6 ) is arranged such that the relative position of the reversing device ( 7 ) is uninfluenced by the relative position of the steering device ( 6 ).
1. Steering arrangement for ships propelled by water jet, comprising:
a) a steering device ( 6 ) that is pivotal in relation to the ship's body about an essentially vertical center line (Cl);
b) a turning device ( 4 ) fixedly connected to said steering device;
c) at least one hydraulic cylinder ( 2 ; 3 ) for turning said steering device ( 6 ) via said turning device;
d) a reversing device arranged in connection with said steering device ( 6 ); and
e) an additional hydraulic cylinder ( 9 ) arranged to act on the reversing device ( 7 ),
wherein said at least one hydraulic cylinder is directly or indirectly articulately connected to the ships' body at one end of its ends ( 2 B; 3 B) and connected to said turning device at a second end ( 2 A; 3 A) at a distance from said center line,
wherein all hydraulic cylinders ( 2 , 3 , 9 ) are arranged within a sheltered space ( 1 ) located above the extension of said center line, which space ( 1 ) is accessible for maintenance from the inside of the ship,
wherein said reversing device is arranged about an essentially horizontal shaft ( 12 ) on said steering device to follow the movement of the steering device ( 6 ),
wherein said additional hydraulic cylinder ( 9 ) is arranged at the turning device ( 4 ) such that the relative position of the reversing device ( 7 ) is uninfluenced by the relative position of the steering device ( 6 ), and
wherein movement of said additional hydraulic cylinder produces a horizontal pivotal movement of said reversing device.
2. Steering arrangement according to claim 1 , characterised in that the hydraulic cylinder ( 9 ) controlling the reversing device ( 7 ) is articulately connected to a pivoting arm ( 15 ) that in its turn acts on a link ( 29 ) that is connected to a lever arm ( 17 ) for the reversing device ( 7 ).
3. Steering arrangement according to claim 2 , characterised in that said centre line (C 3 ) of said hydraulic cylinder ( 9 ) comes close to said first center line (Cl).
4. Steering arrangement according to claim 2 , characterised in that said pivoting arm ( 15 ) is arranged about a shaft ( 8 ), the center line (C 2 ) of which comes close to said first center line (C 1 ).
5. Steering arrangement according to claim 1 , characterised in that said space ( 1 ) has at least one wall ( 1 A) that is part of the outer boundaries of the ship, said wall being arranged above the water line.
6. Steering arrangement according to claim 1 , characterised in that positional measuring equipment for measuring the position of the steering device ( 6 ) and/or the reversing device ( 7 ) also is arranged within said space.
7. Steering arrangement according to claim 1 , characterised in that said bottom part ( 1 F) of said space ( 1 ) at least for some part is arranged above and in contact with, the outlet part ( 20 ) for the water jet unit.
8. Steering arrangement according to claim 1 , characterised in that two cylinders ( 2 , 3 ) articulately connected to said turning device ( 4 ) and with their first ends ( 2 A; 3 A) on each side of said shaft ( 5 ), are used to turn the steering device ( 6 ).