JP2923158B2 - Hydraulic cylinder drive lock marine fin stabilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin stabilizer for suppressing rolling and pitching of a hull.
In particular, the present invention relates to a hydraulic cylinder drive lock type marine fin stabilizer that drives a fin with a hydraulic cylinder to swing it out of the boat and locks it when not in use.

[0002]

2. Description of the Related Art Conventional hydraulic cylinder drive lock type marine fin stabilizers include those shown in FIGS. 6 and 7, in which a rotating shaft 21 to which fins (not shown) are fixed via an arm 1a is provided in the ship. The other end of the lever 1 having one end fixed to the rotating shaft 21 is connected to a piston rod 3a of the oscillating hydraulic cylinder 3 pivotally mounted at a fulcrum 25 in the ship.
Is pivotally connected to the tip portion 4 of the camera by a pin 22. Then, as shown in FIG. 6, the hydraulic cylinder 3 enters a use state in which the fins are swung out of the boat at the stroke end where the piston rod 3a is retracted, and as shown in FIG.
At the stroke end where the piston rod 3a protrudes, the fin is stored in the boat.

In the fin use state shown in FIG. 6, the hook lever 8 of the lock mechanism for maintaining this state rotates together with the rotation shaft 20 by the operation of the locking cylinder 9 and the tail end of the lever 1 is moved. Is locked by contact with Further, from the locked state when the fins are used, the lock is released by rotating the hook lever 8 and the piston rod 3a is protruded to operate the fin retracted state shown in FIG. The lock is performed by moving the piston rod and bringing it into contact with the jaw portion of the piston rod distal end portion 4.

[0004]

In the conventional fin stabilizer for a marine vessel as described above, a locking cylinder 9 is required in addition to the hydraulic cylinder 3 for driving the fins, and a control device for the cylinder 9 is also required. As a result, the structure is complicated, the required space inside the ship is increased, and the cost is also increased. The present invention is intended to solve such a problem and eliminates the need for a conventional locking cylinder and merely provides a fin drive hydraulic cylinder. It is an object of the present invention to provide a hydraulic cylinder drive lock type marine fin stabilizer which can maintain a locked state without pressurizing the inside of a cylinder.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a hydraulic cylinder drive lock type marine fin stabilizer according to the present invention is provided with a finned rotation provided on a ship with a base end of the fin fixed. A shaft, a lever having a base end fixed to the rotating shaft, a connecting rod having one end pivotally connected to a distal end of the lever, and a guide rod pivotally connected to the other end of the connecting rod and guided along a guide rail in the ship. A movable block, and a hydraulic cylinder for fin drive, which is fitted with a piston rod having the movable block at its tip and is disposed in parallel with the guide rail, and a stroke in which the piston rod of the hydraulic cylinder is retracted. When the fin is swung outboard at the end, the center of the pivot pin between the connecting rod and the movable block is the center of the pivot pin between the lever and the connecting rod. When the fin is retracted into the ship at the stroke end that protrudes the piston rod of the hydraulic cylinder while being set so as to be at a lock position slightly outside the circular arc locus, the center of the lever is A lock position where the line is substantially perpendicular to the projecting direction of the piston rod, and the center of the pivot pin between the connecting rod and the movable block is slightly away from the center line of the lever with respect to the cylinder body of the hydraulic cylinder. Is set as described above.

[0006]

In the above-described marine fin stabilizer of the hydraulic cylinder drive lock type according to the present invention, the operation of the hydraulic cylinder causes
When the movable block at the tip of the piston rod is guided along the guide rail and moves to reach the stroke end while retracting the piston rod of the hydraulic cylinder, the same as the connecting rod pivotally attached to the movable block. The rotating shaft with fins is rotated via the lever pivotally attached to the rod, and the fins are used out of the boat. At this time, the center of the pivot pin between the connecting rod and the movable block is located slightly outside the arc-shaped locus defined by the center of the pivot pin between the lever and the connecting rod. The lock in the extended use state is performed.

Further, when the piston rod of the hydraulic cylinder is made to reach its stroke end while protruding, the rotating shaft with fins rotates in the opposite direction via the movable block, the connecting rod and the lever, and
The fins are stored in the ship. At this time, the center line of the lever is substantially perpendicular to the protruding direction of the piston rod, and the center of the pivot pin between the connecting rod and the movable block is positioned at the center line of the lever with respect to the cylinder body of the hydraulic cylinder. The fins are locked in the retracted state by being located at a position slightly distant from the fins.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hydraulic cylinder drive lock type marine fin stabilizer as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a use state in which the fins are swung outboard, and FIG. FIG. 3 is a plan view showing a main part of the fin stabilizer in a fin use state, FIG. 3 is a plan view showing a main part of the fin stabilizer in a fin storage state, and FIG. 4 is a side view of a main part of the fin stabilizer. FIG. 5 is an explanatory view showing the operation of the fin stabilizer in the fin retracted state.

As shown in FIG. 1, FIG. 2 and FIG. 4, in a fin stabilizer for a ship, a rotating shaft 21 with a fin is provided in the ship, to which a base end of a fin 1b is fixed via an arm 1a. The base end of the lever 1 is fixed to the rotating shaft 21. At the end of the lever 1 is a connecting rod 2
Is pivotally connected by a pivot pin 10 and the other end of the connecting rod 2 is connected to a movable block 5 guided along a guide rail 6 in the ship by a pivot piston 11 via a tip 4 of a piston rod 3a. Being pivoted. (See FIG. 4) The fin drive hydraulic cylinder 3 fitted into the piston rod 3a is fixedly disposed in the ship in parallel with the guide rail 6, and the piston rod 3 of the hydraulic cylinder 3 is fixed.
At the stroke end in which a is retracted, as shown in FIG. 2, the fin is swung out of the boat together with the arm 1 a, and in this state, the fin is pivoted between the connecting rod 2 and the movable block 5. The center is set so as to be at a lock position slightly outside the arc-shaped locus 23 defined by the center of the pivot pin 10 between the lever 1 and the connecting rod 2.

The piston rod 3 of the hydraulic cylinder 3
At the stroke end where a is protruded, as shown in FIG. 3, the fin is stored in the boat together with the arm 1a. In this fin stored state, the center line 24 of the lever 1 is substantially perpendicular to the protruding direction of the piston rod 3a. Connecting rod 2
The center of the pivot pin 11 between the hydraulic cylinder 3 and the movable block 5 is set at a lock position slightly away from the center line 24 of the lever 1 with respect to the cylinder body of the hydraulic cylinder 3. In this fin retracted state, as shown in FIG. 5, the angle θ between the lever 1 and the connecting rod 2 is set to a small angle,
In order to perform a proper locking action, the angle θ is set to 6.87 ° or less. In FIG. 5, M indicates an external force moment, and N indicates a vertical stress caused by the external force moment M. F indicates the frictional force due to the normal stress N,
T indicates a reaction force accompanying the external force moment M.

Since the hydraulic cylinder drive lock type marine fin stabilizer of this embodiment is constructed as described above, the piston rod 3a of the hydraulic cylinder 3 can be retracted to reach the stroke end when the fins are swung out. By doing so, the connecting rod 2 pivotally attached to the movable block 5 moving along the guide rail 6,
The finned rotation shaft 21 rotates via the lever 1 pivotally attached to the rod 2, and the fins are used out of the boat. At this time, the center of the pivot pin 11 between the connecting rod 2 and the movable block 5 is located slightly outside the arc-shaped trajectory 23 defined by the center of the pivot pin 10 between the lever 1 and the connecting rod 2. Even if the fin pushed by the water flow tries to rotate clockwise (storing direction) in FIG. 2 together with the arm 1a, since the movable block 5 is pressed against the guide rail 6, the fin is prevented from turning in the storing direction, and Restriction (lock) is performed.

When the fins are retracted, if the piston rod 3a of the hydraulic cylinder 3 is made to reach its stroke end while protruding from the state shown in FIG. 2, the connecting rod 2 goes through a state parallel to the guide rail 6,
Further, the fin is stored as shown in FIG. Even when the connecting rod 2 is parallel to the guide rail 6, the rotational moment as a product of the thrust of the piston rod 3 a and the mutual distance from the center of the rotating shaft 21 to the center line of the guide rail 6 is used. The rotation of the rotation shaft 21 is continued, and reaches the fin retracted state of FIG. At this time, the center line 24 of the lever is substantially perpendicular to the direction in which the piston rod 3a protrudes, and the center of the pivot pin 11 between the connecting rod 2 and the movable block 5 is positioned with respect to the cylinder body of the hydraulic cylinder 3. Since the fin is located at a position slightly distant from the center line 24, the fin is locked in the retracted state.

That is, in the fin retracted state shown in FIG. 3, even if the rotating shaft 21 of the finned arm 1a tries to rotate in the counterclockwise direction (fin swinging direction), the frictional force F of the movable block 5 against the guide rail 6 is obtained. As a result (see FIG. 5), the movable block 5 does not move to the cylinder body side of the hydraulic cylinder 3, and thus the locking action is performed. Each locking operation in the fin swinging-out state and the fin storage state described above can be performed without pressurizing the inside of the hydraulic cylinder 3, whereby the locking operation can be sufficiently ensured. (Refer to reference numeral 9 in FIGS. 6 and 7) and the advantage that the control device for the cylinder is not required.

[0014]

As described in detail above, the hydraulic cylinder drive lock type marine fin stabilizer of the present invention has the following advantages. (1) By simply providing a hydraulic cylinder for swinging out and storing the fins, a lock effect can be obtained in the swing-out state and the storage state of the fins, and this lock effect can be obtained without pressurizing the inside of the hydraulic cylinder. Become like (2) The above-mentioned item (1) eliminates the need for the conventional locking cylinder and its control device, which leads to a reduction in manufacturing cost and a reduction in space required on board.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fin swing-out state in a hydraulic cylinder drive lock type marine fin stabilizer as one embodiment of the present invention.

FIG. 2 is a plan view of a main part of the fin stabilizer in a fin swing-out state.

FIG. 3 is a plan view of a main part of the fin stabilizer in a fin stowed state;

FIG. 4 is a side view of a main part of the fin stabilizer.

FIG. 5 is an explanatory diagram showing an operation of the fin stabilizer in a fin retracted state.

FIG. 6 is a plan view of a main part of a conventional fin stabilizer for a marine vessel in a fin swinging state.

FIG. 7 is a plan view of a main part of a conventional fin stabilizer for a marine vessel in a fin retracted state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lever 1a Arm 1b Fin 2 Connecting rod 3 Hydraulic cylinder 3a Piston rod 4 Piston rod tip part 5 Movable block 6 Guide rail 10,11 Pivot pin 21 Rotation shaft with fin 23 Arc-shaped locus of pivot pin 10 24 Lever 1 center line

Claims (1)

(57) [Claims] 1. A fin stabilizer for a ship, comprising: a finned rotation shaft provided in a ship with a base end of the fin fixed thereto; a lever having a base end fixed to the rotation shaft; A connecting rod with one end pivotally attached to the tip,
A movable block pivotally connected to the other end of the connecting rod and guided along a guide rail in the ship, and a fin drive in which a piston rod having the movable block at its tip is inserted and disposed in parallel with the guide rail. When the fin is swung outboard at the stroke end where the piston rod of the hydraulic cylinder is retracted, the center of the pivot pin between the connecting rod and the movable block is The fin is set at a lock position slightly outside the arcuate locus defined by the center of the pivot pin between the lever and the connecting rod, and at the stroke end where the piston rod of the hydraulic cylinder projects. When stored in the ship, the center line of the lever is substantially perpendicular to the direction in which the piston rod protrudes, and A hydraulic cylinder drive lock type, wherein a center of a pivot pin with the movable block is set at a lock position slightly away from a center line of the lever with respect to a cylinder body of the hydraulic cylinder. Marine fin stabilizer.