JP2002250398A - Vibration damping cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent corrosion in a weld part of a nut for fastening, to facilitate manufacturing and mounting, and to reduce the number of parts and man-hours for mounting. SOLUTION: This vibration damping cover comprises: a pressure receiving plate formed so as to cover a body wall; a strut fixed to the pressure receiving plate so as to face the body wall; a band plate attached to the tip of the strut; a layer of damping elastic members formed integrally so as to cover the surface of the body wall side of the pressure receiving plate, the strut, and the band plate. A damping coating segment which fixes the end of the layer of the damping elastic members to the body wall by abutting the surface on the body wall side of the layer of the damping elastic members against the body wall is mounted to the both wall. Accordingly, there is no risk of the corrosion around the weld part in addition to achieving a protection of the damping elastic members, impact absorbing and damping, maintenance is easy to be carried out, a structure is made simple, a manufacturing operation is facilitated, and the number of parts and man-hours for mounting are reduced upon mounting, thereby reducing a cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-absorbing coating for reducing shock and vibration received from the outer surface of a device.

[0002]

2. Description of the Related Art The impact of fluid on the surface of the body wall of a device,
When receiving vibration, a vibration absorbing coating for absorbing vibration may be attached to the body wall in order to prevent the influence of the shock and vibration on the inside of the apparatus and damage to the body wall. In particular, when the fluid is a liquid such as water and is subjected to cavitation collisions in the liquid, the impact of the cavitation is large, and a vibration absorbing coating capable of sufficiently absorbing the vibration and protecting the coating itself is required.

[0003] Fig. 2 is an explanatory view showing, as a general example, a mounting state of a vibration absorbing coating on a side thruster of a ship, and shows a cross section of a side thruster mounting portion of the ship.

As shown in FIG. 2, a side thruster 1 of a ship has a propeller 5 supported by a supporting leg 4 in the center of a tunnel portion 3 penetrating across the port side of the hull 2 and directed in the lateral direction of the hull 2. The propeller 5 is rotationally driven via a drive shaft 7 by a drive motor 6 mounted in the hull 2.

When the propeller 5 is rotated, the tunnel 3
A water current is generated in the horizontal direction of the hull 2, and the hull 2 receives a thrust toward the left and right. At this time, cavitation occurs in the water due to the rotation of the propeller 5, and the wall of the tunnel portion 3 around the propeller 5. Collide with

[0006] Cavitation is also generated by a propeller for propulsion in a ship. However, in the side thruster 1, there is a tunnel wall 011 as an airframe wall which collides with a propeller 5 which generates cavitation at a short distance.
The effects are enormous, and it is essential to prevent and reduce the propagation of vibrations into the hull, and to protect the fuselage wall from damage due to collisions, impacts and vibrations.

Therefore, as shown in FIG. 2, a vibration absorbing coating 010 is attached to a tunnel wall 011 around the propeller 5 of the side thruster 1.

An example of a conventional vibration absorbing coating 010 will be described.
As shown in FIG. 3 showing a cross section taken along the line AA in FIG. 2, along the tunnel wall 011 of the tunnel portion 3, the vibration absorbing coating segments 012 divided into a plurality in the circumferential direction are formed. Is by a plurality of bolts 013
It is fastened to a nut 014 welded to the tunnel wall 011 side.

Each of the vibration-absorbing coating segments 012 is denoted by B in FIG.
As shown in an enlarged view of FIG.
On the side of the tunnel wall 011 of the steel pressure receiving plate 012a formed so as to cover along the inner circumferential curved surface of the steel plate, the band plates 012b, 012c, 0 are arranged in three stages at intervals from the pressure receiving plate 012a.
12d, a layer of vibration-absorbing rubber material 012e is formed integrally by wrapping them, and bolts 013 are attached to nuts 014 welded to the tunnel wall 011 at a plurality of points.
Has been concluded.

The structure of the vibration absorbing covering segment 012 is shown in FIG.
This will be further described with reference to FIG.
FIG. 5 is an enlarged sectional view of a portion D in FIG.

As shown in FIG. 5, a support 012f is fixed to the pressure receiving plate 012a by welding toward the tunnel wall 011, and a female screw of a bolt 012g is provided at the tip of the support 012f. The central band plate 012c in the thickness direction is fastened by bolts 012g.

The upper and lower strips 0 are located between adjacent strips 012c.
12b and 012d are arranged so that the edges overlap with the band plate 012c with the spacer 012h interposed therebetween, and the upper and lower band plates 012b and 012d and the spacer 012h are provided with bolt holes 012i of bolts 012 and bolt holes 012.
The position of i is the nut 01 welded to the tunnel wall 011
4 is matched.

The layer of the vibration-absorbing rubber material 012e is
a surface on the side of the tunnel wall 011, support 012 f, bolt 0
12g, the band plates 012b, 012c, 012d, and the spacer 012h are wrapped around and integrally cast to form a layer having a constant thickness to be attached to the tunnel wall 011.

The layer of the vibration-absorbing rubber material 012e is provided with a mounting hole 012j on the side opposite to the spacer 012h of the band plate 012d, and the head of a bolt 013 on the side of the band plate 012b opposite to the spacer 012h. A mounting hole 012k through which the portion passes is provided, and a pressure receiving plate 012a is also provided with a mounting hole 012l in accordance with the mounting hole 012k.
A lid 012m is detachably attached to the attachment hole 012l.

The vibration absorbing covering segment 012 formed in advance as described above is set on the tunnel wall 011 so that the nut 014 of the tunnel wall 011 and the bolt hole 012i of the spacer 012h coincide with each other. 012l, 012k, and bolt holes 012i, and are fastened to the nut 014 and fixed on the tunnel wall 011. After that, a lid 012m is attached to the attachment hole 012l of the pressure receiving plate 012a.

When the plurality of vibration-absorbing coating segments 012 are attached over the entire circumference, the vibration-absorbing coating 010 is provided on the tunnel wall 011 around the propeller 5. In addition, the vibration absorption coating segment 012 is usually a tunnel wall 011.
5 in such a state that the surfaces are continuous with each other without a step.

In the above-described vibration absorbing coating 010, shocks and vibrations due to cavitation and the like in water are first applied to the pressure receiving plate 0.
Since it is received by 12a and the lid 012m, the vibration absorbing rubber member 012e, which is a soft vibration absorbing member, is protected from damage.

The pressure receiving plate 012a has its surface and the band plate 01.
2c is integrated with the layer of the vibration-absorbing rubber material 012e, and the layer of the vibration-absorbing rubber material 012e is attached to the strips 012b and 012d attached to the bolts 013 fixed to the tunnel wall 011.
Are integrated with the band plate 012c and the band plate 012.
b and 012d are not directly in contact with each other, and are disposed via the vibration absorbing rubber member 012e. Therefore, the vibration and shock received by the pressure receiving plate 012a are absorbed by the vibration absorbing rubber member 012e and transmitted directly to the bolt 013 and the tunnel wall 011. Absent.

[0019]

In the above-described conventional vibration-absorbing coating structure, since the nut 014 is welded and bolted on the back surface of the vibration-absorbing coating segment 012, the connection between the vibration-absorbing coating segment 012 and the tunnel wall 011 is made. Water gradually penetrates from the gap, and there is a possibility that corrosion around the welded portion of the nut may proceed unknowingly. The nut 014 is welded to the tunnel wall 011 to attach the vibration absorbing covering segment 012 and fastened with the bolt 013. Therefore, the positions of the plurality of nuts 014 and the bolts 013 must be aligned, which makes installation difficult.
Plural band plates 012b, 012c, 012d, spacer 0
12h etc. must be integrally molded in the layer of the vibration-absorbing rubber material 012e in a precise positional relationship, and there are difficulties in manufacturing, and the number of parts and the number of mounting steps, such as bolt 013 fastening and lid 012m mounting, are large. , Etc., which are factors that increase costs.

The present invention solves the problem of the conventional vibration-absorbing coating and eliminates the possibility of corrosion of the welded portion of the fastening nut.
An object of the present invention is to provide a vibration-absorbing coating that can be easily manufactured and mounted, and reduces the number of parts and the number of mounting steps.

[0021]

Means for Solving the Problems (1) The present invention has been made to solve the above-mentioned problems, and the
Pressure receiving plate formed in a shape covering the body wall,
A strut fixed to the pressure receiving plate toward the fuselage wall, a band plate attached to the tip of the strut, a surface of the pressure receiving plate on the body wall side, the support and the band plate are wrapped and integrally formed. A vibration-absorbing elastic material layer, wherein the surface of the layer of the vibration-absorbing elastic material on the side of the body wall is in contact with the body wall, and the edge of the layer of the vibration-absorbing elastic material is fixed to the body wall. The covering segment
Provided is a vibration-absorbing coating that is mounted on the airframe wall.

According to the vibration absorbing coating of the first means, the vibration absorbing elastic material is protected from damage by the pressure receiving plate, and the shock and vibration received by the pressure receiving plate are absorbed by the vibration absorbing elastic material and are not transmitted directly to the body wall. In addition to this, there is no danger of the corrosion around the welded part of the nut welded to the back of the vibration absorbing covering segment for fastening, and the structure is extremely simple, and the edge of the layer of the vibration absorbing elastic material is attached to the body even during installation. What is necessary is just to fix to a wall.

(2) As a second means, there is provided the vibration-absorbing coating according to the first means, wherein the body wall is a tunnel wall of a side thruster of a ship.

According to the vibration-absorbing coating of the second means, in addition to the function of the first means, it is provided especially on the inner surface of the narrow tunnel portion. The characteristics are effectively exerted on the tunnel wall surface of a side thruster of a ship that requires easiness and durability against the corrosiveness of seawater.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration absorbing coating according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a vibration absorbing coating segment in the vibration absorbing coating of the present embodiment at the same position as that of FIG.

This embodiment is also a vibration-absorbing coating mounted on the inner wall of the tunnel portion 3 around the propeller 5 of the side thruster 1 of a ship similar to that described in FIG.

Therefore, except that the structure of the individual vibration absorbing coating segments and the manner of attaching them are different, they are used in the same manner as the above-described conventional vibration absorbing coating. , Description thereof will be omitted, and different points will be mainly described below.

In this embodiment, as in the case of the vibration-absorbing coating segment 012 of the vibration-absorbing coating 010 provided on the tunnel wall 011 shown in FIG. 3, a plurality of the vibration-absorbing coating segments 12 are provided around the propeller 5 of the side thruster 1. 5 is mounted on a tunnel wall 11 as an airframe wall, and its internal structure and mounting structure are as shown in FIG.

That is, the steel pressure receiving plate 12a is formed in a shape to cover the tunnel wall 11 to be mounted.
The support 12f is fixed to the side by welding, and a female screw of a bolt 12g is provided at the tip of the support 12f. A band plate 12c is attached to the vibration absorbing covering segment 12 near the center in the thickness direction by the bolt 12g.

On the side of the pressure receiving plate 12a on the side of the tunnel wall 11, a layer of a vibration absorbing rubber material 12e wraps the pressure receiving plate 12a, the support 12f, the bolt 12g, and the strip 12c, and has a constant thickness to be integrally attached to the tunnel wall 11. It is formed by casting.

The rubber material 12 of the vibration absorbing coating segment 12
e, a pressure receiving plate 1 is provided on an edge around the inside of the tunnel portion 3.
2a, there is formed a portion provided with a mounting step 12n. As shown, for example, the mounting step 12n is pressed down and fixed to the tunnel wall 11 by the mounting strip 15 at the mounting step 12n. Are attached so as to be continuous without any step.

The tunnel wall 11 of the mounting strip 15
The fixing to the device may be performed by a bolt or the like as appropriate.

The vibration absorbing rubber material 12 of the vibration absorbing covering segment 12
The layer e has such a thickness that the surface on the side of the tunnel wall 11 abuts on the tunnel wall 11 in the attached state.

According to the above-described vibration-absorbing coating of the present embodiment, the impact and vibration due to cavitation and the like in water are reduced.
First, since it is received by the pressure receiving plate 12a, the vibration absorbing rubber member 12e, which is a soft vibration absorbing member, is protected from damage.

The pressure receiving plate 12a has its surface and a band plate 12c.
Is integrated with the layer of the vibration absorbing rubber material 12e through
Since the band plate 12c and the tunnel wall 11 are arranged so as not to come into direct contact with each other but to be in contact with each other via the vibration absorbing rubber material 12e,
Impacts and vibrations received by the pressure receiving plate 12a are absorbed by the vibration absorbing rubber material 12e, and are not transmitted directly to the tunnel wall 11.

Further, since the vibration-absorbing coating segment 12 is not fastened on the back surface thereof, there is no fear that the vicinity of the welded portion of the nut welded on the back surface of the vibration-absorbing coating segment 12 for the fastening may proceed without knowing. Maintenance becomes easy.

Further, the structure of the vibration-absorbing covering segment 12 itself does not require alternately arranging multi-stage strips, but merely attaches a single-stage strip to the pressure receiving plate side and integrates with the layer of the vibration-absorbing rubber material 12e. The structure is extremely simple, and the manufacture of the vibration-absorbing covering segment 12 becomes easy. In mounting, the edge of the layer of the vibration-absorbing rubber material 12e of the vibration-absorbing covering segment 12 may be fixed to the tunnel wall 11 by the attaching strip 15 and the necessary The number of mounting bolts is small, and a cover for the mounting hole is not required, so that the number of components and the number of mounting steps can be reduced, and thus the cost can be reduced.

In the above-described conventional example and the embodiment, the vibration absorbing coating for protecting the wall surface of the tunnel portion of the side thruster of the ship is shown as an example. However, the vibration absorbing coating of the present invention is not limited to this. Impact from fluids, generally in general,
The present invention can be implemented as a vibration-absorbing coating for the body wall of a device that receives vibration, and is particularly effective as a vibration-absorbing coating for a portion that receives the impact of cavitation of a liquid such as water.

Of course, the vibration-absorbing coating on the inner wall of the tunnel portion of the side thruster of the ship shown in the embodiment is provided on the inner surface of the narrow tunnel portion. Since ease of maintenance and durability against the corrosiveness of seawater are required, the side thruster provided with the vibration absorbing coating according to the present embodiment can effectively exhibit the characteristics of the vibration absorbing coating, thereby reducing the cost and operation of the side thruster. The above effect is also great.

The embodiment of the present invention has been described above.
The present invention is not limited to the above embodiment, and it goes without saying that various changes may be made to the specific structure within the scope of the present invention.

For example, the layer of the vibration-absorbing rubber material 12e is not limited to a layer formed by casting one side of the pressure-receiving plate 12a so as to enclose another member. And the like. Pressure receiving plate 12a, band plate 12c, strut 12
f, the bolt 12g is not limited to steel and may be made of an appropriate alloy, a hard resin material, or the like.
Is not limited to a rubber material, but may be a vibration-absorbing elastic material such as an appropriate synthetic rubber material or elastic resin material.

[0042]

(1) According to the first aspect of the present invention, the pressure-absorbing plate is formed so as to cover the body wall with the vibration-absorbing coating, the column fixed to the pressure-receiving plate toward the body wall, and the column. A band plate attached to the tip of the pressure receiving plate, a layer of the vibration absorbing elastic material integrally formed by wrapping around the body wall side surface of the pressure receiving plate, the strut, and the band plate. Since the surface of the airframe wall side is in contact with the airframe wall and the edge of the layer of the vibration-absorbing elastic material is fixed to the airframe wall, the vibration-absorbing coating segment is configured to be attached to the airframe wall. The pressure-receiving plate protects the vibration-absorbing elastic material from damage, and the shock and vibration received by the pressure-receiving plate are absorbed by the vibration-absorbing elastic material and are not directly transmitted to the body wall. There is no risk of corrosion progressing around the welded part of the The structure is extremely simple and the production is easy, and the edge of the layer of the vibration-absorbing elastic material can be fixed to the fuselage wall in the installation, reducing the number of parts and the number of installation steps, thereby reducing the cost. The above reduction can also be achieved.

(2) According to the invention of claim 2, claim 1
In the vibration-absorbing coating described in (1), since the body wall is configured to be a tunnel wall of a side thruster of a ship, in addition to the effect of the invention of claim 1, it is provided particularly on the inner surface of a narrow tunnel portion. As a vibration-absorbing coating on the tunnel wall of a ship's side thruster, which requires not only easiness but also easy installation, easy maintenance, and durability against seawater corrosion, it can effectively exhibit its characteristics. The thruster is also very effective in terms of cost and operation.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a vibration absorbing and covering structure according to an embodiment of the present invention, and is a cross-sectional view of a vibration absorbing and covering segment in the vibration absorbing and covering structure of the present embodiment at the same position as FIG. It is.

FIG. 2 is an explanatory view of a state in which a vibration absorbing coating is mounted on a side thruster of a general ship, and is a cross-sectional view of a side thruster mounting portion of the ship.

FIG. 3 is an explanatory view of a conventional vibration-absorbing coating structure; FIG.
It is sectional drawing in the -A arrow direction.

FIG. 4 is an enlarged view of a portion B in FIG.

5 is a cross-sectional view taken along a line CC in FIG. 4 and an enlarged cross-sectional view of a portion D in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side thruster 2 Hull 3 Tunnel part 4 Support leg 5 Propeller 10 Vibration absorbing covering 11 Tunnel wall 12 Vibration absorbing covering segment 12a Pressure receiving plate 12c Strip 12e Vibration absorbing rubber material 12f Strut 12g Bolt 12n Mounting step 15 Mounting strip

Claims (2)

[Claims] A pressure receiving plate formed in a shape covering a body wall;
A strut fixed to the pressure receiving plate toward the fuselage wall, a band plate attached to the tip of the strut, a surface of the pressure receiving plate on the body wall side, the support and the band plate are wrapped and integrally formed. A vibration-absorbing elastic material layer, wherein the surface of the layer of the vibration-absorbing elastic material on the side of the body wall is in contact with the body wall, and the edge of the layer of the vibration-absorbing elastic material is fixed to the body wall. The covering segment
A vibration-absorbing coating that is mounted on the airframe wall. 2. The vibration absorbing coating according to claim 1, wherein the body wall is a tunnel wall of a side thruster of a ship.