JP2002286451A - Vibration-proof buffer device for gyrocompass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unnecessary torque from being applied to a gyrocompass even if a shock is applied to a sailing body or the gyrocompass. SOLUTION: The vibration-proof buffer device for gyrocompass has a fixed part on the side of the sailing body, a movable part which supports the gyrocompass and can move to and away from the fixed part, and attenuation device which attenuates the movement of the movable part to and away from the fixed part, and the fixed part and movable part have annular parts arranged on concentric circles having mutually different diameters, and when the movable part moves relatively to the fixed part owing to the abrupt movement of the sailing body or gyrocompass, the annular part of the movable part abuts against the annular part of the fixed part to stop the sailing body or gyrocompass from moving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device used for a gyrocompass, and more particularly to a vibration damping device for a mechanical gyrocompass mounted on a ship or the like.

[0002]

2. Description of the Related Art An example of a vibration damping device used in a conventional gyro compass will be described with reference to FIGS. As shown in FIG. 4, the vibration damping device has four vibration dampers 40.
-1, 40-2, 40-3, 40-4 and four support members 60. The vibration isolator is mounted on a mounting member 2 of a navigation body such as a ship or an aircraft. The support member 60 includes an upper end 60A, an intermediate portion 60B, and a lower end 60C. The upper end 60A is attached to the upper end of the vibration isolating buffer.
The base plate 4 is supported by C, and the gyro compass 6 is mounted on the base plate 4.

Referring to FIG. 5, vibration damping bodies 40-1 and 40 are provided.
One of -2, 40-3, and 40-4 will be described in detail. The vibration isolator is mounted on the shaft 41 and the cup 42 movable axially downward with respect to the shaft 41, the first spring 43 mounted on the upper side of the cup 42, and the first rubber 44 and the lower side of the cup 42. A second spring 45 and a second rubber 46.

[0004] The first spring 43 is connected to the upper end 6 of the support member 60.
The first rubber 44 is supported on the lower surface of the support member 60 and the lower surface of the upper end 60A of the support member 60. The second spring 45 and the second rubber 46 are connected to the shaft 4.
It is supported by a washer 49 attached to the first.

[0005] On the upper surface of the upper end 60A of the support member 60,
A friction plate 51 is arranged so as to come into contact therewith. A slide bearing 52 is mounted in a center hole of the friction plate 51, and a third spring 47 is provided on the bearing 52. The upper end of the third spring 47 is supported by the washer 53. A third rubber 48 is mounted on the washer 53. An adjustment screw 54 is mounted on the washer 53.

A leaf spring 6 is provided at an intermediate portion 60B of the support member 60.
1 and a stopper 62 are mounted. The leaf spring 61 is in contact with the outer peripheral surface of the cup 42. The elastic force of the leaf spring 61 absorbs the horizontal vibration of the gyro compass 6, and the friction force between the leaf spring 61 and the cup 42 attenuates the vertical vibration of the gyro compass 6.

The operation of the vibration damping device of this embodiment will be described. First, a case where a navigation body such as a ship vibrates in a vertical direction will be described. The gyro compass 6 vibrates relatively vertically,
The base plate 4 and the support plate 60 also vibrate in the vertical direction. When the amplitude of the vibration is relatively small, the vibration is absorbed by the elastic force of the first and third springs 43 and 47 and the frictional force of the leaf spring 61. The vertical downward force acting on the gyro compass 6 is applied to the first spring 43, the cup 42 and the second spring 4.
5, since the spring constant of the second spring 45 is sufficiently larger than the spring constant of the first spring 43,
Only 3 shrinks. When this force is large, the first rubber 43 abuts on the cup 42 due to the contraction of the first spring 43, and the cup 42 moves axially downward with respect to the shaft 42. As the cup 42 moves downward, the second spring 45 contracts and absorbs this force.

The upward force acting on the gyro compass 6 in the vertical direction is absorbed by the elastic force of the third spring 47. If the force is large, the third rubber 48 is brought into contact with the friction plate 51. , The gyro compass 6 is prevented from moving further upward.

Next, a case where a navigation body such as a ship vibrates in a horizontal direction will be described. The gyro compass 6 vibrates relatively horizontally, and the base plate 4 and the support plate 60 also vibrate horizontally. The vibration is absorbed by the frictional force between the friction plate 51 and the upper end 60A of the support member 60 and the elastic force of the leaf spring 61.
The friction force generated by the friction plate 51 is the third spring 4
7 and the elastic force of the first spring 43. The spring constant of the first spring 43 is constant, while the spring constant of the third spring 47 can be changed by the adjusting screw 54. By operating the adjustment screw 54,
An optimum frictional force can be obtained.

[0010]

A description will be given with reference to FIG. In the conventional vibration damping device, four corners of the base plate 4 supporting the gyro compass 6 are divided into four vibration damping members 40-1 and 40-.
2, 40-3, and 40-4. When the navigating body makes a sudden movement, it is equivalent to the impact force (arrow F) acting on the center of gravity G of the gyro compass 6 (strictly, the center of gravity of the portion composed of the gyro compass and the base plate). This impact force F is absorbed by the vibration damping device, but usually does not act simultaneously and evenly on the four vibration damping members, and at a high probability, firstly one vibration damping member, for example, 40 Acts on -1. When the line of action of the impact force does not pass through the center axis of the vibration damping buffer 40-1, the torque T =
F × L occurs. This torque has a significant effect on the gyrocompass, especially on the drive around the vertical axis, which degrades the performance of the gyrocompass.

In the conventional shock absorbing device, the support member 6
Both the absorption mechanism for absorbing the vibration in the vertical direction and the absorption mechanism for absorbing the vibration in the horizontal direction are mounted at 0. In such a structure, a phenomenon that one vibration (for example, vertical vibration) induces another vibration (horizontal vibration), that is, a so-called vibration coupling may occur.

An object of the present invention is to provide a vibration damping device for a gyrocompass in which unnecessary torque does not act on a driving device around a vertical axis of the gyrocompass in response to an external impact.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the occurrence of coupling between vertical vibration and horizontal vibration in a vibration damping device for a gyro compass.

[0014]

According to the present invention, there is provided an anti-vibration shock absorber for a gyrocompass, comprising: a fixed portion on the navigation body side; a movable portion supporting the gyrocompass and movable in a horizontal direction with respect to the fixed portion; A damping device for attenuating a horizontal movement of the movable portion with respect to the fixed portion, wherein the fixed portion and the movable portion have annular portions arranged on concentric circles having different radii from each other; When the movable part moves in a horizontal direction relatively to the fixed part due to a sudden movement of the navigation body or the gyro compass, the annular part of the movable part comes into contact with the annular part of the fixed part. Thereby, horizontal movement of the navigation body or the gyro compass is prevented.

According to the present invention, a vibration damping device for a gyro compass includes a fixed member mounted on a mounting portion of a navigation body, a movable member movable in a horizontal direction with respect to the fixed member,
A damping member disposed between the fixed member and the movable member for damping horizontal movement of the movable member with respect to the fixed member; and a gyrocompass mounted on the movable member for supporting a gyrocompass and vibrating in a vertical direction thereof. A plurality of vibration isolating dampers for attenuating the vibration, wherein the fixed member and the movable member have annular portions arranged on concentric circles having different radii from each other, and abruptly moving the navigation body or the gyro compass. When the movable member relatively moves in the horizontal direction with respect to the fixed member due to an excessive motion, the annular portion of the movable member comes into contact with the annular portion of the fixed member so that the navigation body or the gyro can be moved. The compass is configured to prevent horizontal movement.

According to an embodiment of the present invention, the diameter of the annular portion of the fixed member is larger than the diameter of the annular portion of the movable member, the annular portion of the fixed member is the inner surface of the circular hole, and the annular portion of the movable member is Is an outer peripheral surface of the ring-shaped member. A buffer member for absorbing impact is provided on the annular portion of the movable member or the annular portion of the fixed member.

According to the embodiment of the present invention, the vertical position at which the annular portion of the movable member and the annular portion of the fixed member contact each other is the same as the vertical position of the center of gravity of the gyrocompass.

According to an embodiment of the present invention, the damping member includes a viscoelastic material. The viscoelastic material is compressed in advance in a direction perpendicular to the moving direction of the movable member. The vibration isolator has an elastic member and a viscoelastic member for absorbing vibration in a direction perpendicular to the moving direction of the movable member. The viscoelastic member is compressed in advance in the moving direction of the movable member. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a vibration damping device for a gyro compass according to the present invention will be described with reference to FIG. The device of the present example has four vibration dampers 10-1, 10-2, 10-3,
10-4, the movable member 20, and the fixed member 12. The fixing member 12 is mounted on a mounting member of a navigation body such as a ship or an aircraft. The movable member 20 includes four vibration dampers 10-
1, 10-2, 10-3, and 10-4. A support member 65 is mounted on each of the lower portions of the vibration isolation buffer, and the base plate 4 is supported by the support member 65, and a gyrocompass 6 (not shown) is mounted on the base plate 4. The fixed member 12 is formed of a rectangular frame member, and has a circular hole 12A (not shown) for disposing the movable member 20 inside the frame, and holes 12B for disposing vibration dampers at four corners. Having.

The function of the vibration damping device according to the present invention will be described with reference to FIG. FIG. 2 is a diagram in which the anti-vibration shock absorber of the present embodiment is simplified and schematically drawn for the purpose of explanation. The base plate 4 supporting the gyro compass 6 is composed of four vibration dampers 10-
Supported by 1, 10-2, 10-3, 10-4,
The vibration isolator is connected to the movable member 20. The movable member 20 is mounted on the fixed member 12 via the damping member 16. The movable member 20 and the fixed member 12 both have annular portions 20A and 12A concentrically arranged.

A ring-shaped cushioning member 25 is mounted on the annular portion 20A of the movable member 20, as shown in the figure. The annular portion 12A of the fixing member 12 is an inner surface of the circular hole 12A. In this example, the cushioning material 25 is attached to the annular portion 20A of the movable member 20, but the cushioning material 25 is attached to the annular portion 20A of the movable member 20.
And at least one of the annular portions 12A of the fixing member 12.

For the sake of simplicity, it is assumed that only horizontal vibrations are considered and no vertical vibrations are present. Consider a case in which the navigating body makes a sudden movement in the horizontal direction. It is mechanically equivalent to the impact force F (arrow) acting on the center of gravity G of the gyrocompass (strictly, the center of gravity of the portion including the gyrocompass and the base plate). As shown in FIG. 2A, this impact force F
In some cases, the gyro compass 6, the base plate 4, the four vibration dampers 10-1, 10-2, 10-3, 10-4, and the movable member 20 connected thereto are relative to the fixed member 12. To move in the direction of the arrow. If the moving amount of the movable member 20 is large, the cushioning material 25 attached to the movable member 20 comes into contact with the inner surface of the circular hole 12A of the fixed member 12. Cushioning material 25
Is smaller than the radius of the circular hole 12A of the fixing member,
Both come into contact at one point (marked by x) on the circumference. At this contact point (x mark), the impact force F acts in the radial direction. Therefore,
In this example, no torque or moment is generated by the impact force F acting on the center of gravity G of the gyrocompass. Therefore, there is no effect on the driving device provided around the vertical axis provided in the gyrocompass, and the performance of the gyrocompass is not reduced.

As shown in FIG. 2B, the gyro compass 6, the base plate 4, and the four vibration dampers 10-1, 10-2, 1
The vertical position of the center of gravity of the movable body composed of 0-3, 10-4 and the movable member 20 is preferably arranged on a horizontal plane passing through the contact point between the annular portion of the fixed member 12 and the annular portion of the movable member 20. . Since the weight of the gyro compass is sufficiently larger than the weights of the base plate 4, the four vibration dampers 10-1, 10-2, 10-3 and 10-4 and the movable member 20, the position of the center of gravity of the gyro compass 6. The gyro compass 6,
Base plate 4, four vibration-damping buffers 10-1, 10-2, 10-
The position of the center of gravity of the movable body composed of 3, 10-4 and the movable member 20 may be estimated.

When an impact force acts on the navigation body or the gyrocompass, the impact force acts on the center of gravity of the movable part including the gyrocompass 6. If the line of action of the horizontal force acting on the center of gravity is
When it does not pass through the contact point of the annular portion, a torque is generated around a horizontal axis passing through this contact point. This torque adversely affects the drive of the gyrocompass. However, in this example, since the line of action of the horizontal force acting on the center of gravity passes through the contact point between the annular portion of the fixed member 12 and the annular portion of the movable member 20, such unnecessary torque is not generated.

Referring to FIG. 3, vibration damping buffers 10-1 and 10-1
-2, 10-3, and 10-4 will be described. The vibration isolator has a shaft 30 and a first spring 31, a first rubber 32, a second spring 33, a second rubber 34, and a third rubber 35 mounted around the shaft. A fixed sleeve 24 having an inner diameter larger than the outer diameter of the shaft 30 is mounted around the shaft 30, and the first viscoelastic member 14 is provided between the fixed sleeve 24 and the shaft 30.
The fixed sleeve 24 is mounted on the movable member 20 via a mounting member 22 having a U-shaped cross section. Movable member 20
Is an annular portion, that is, a circumferential surface 20A and an upper portion 2 as shown.
OB has an L-shaped cross section. An annular cushioning member 25 is mounted on the circumferential surface 20 </ b> A of the movable member 20.

A movable sleeve 66 is mounted on the lower end of the shaft 30 via a slide bearing. A support member 65 is mounted on the sleeve 66. Support member 6
The base plate 4 supporting the gyro compass 6 is mounted on 5.

As shown, second viscoelastic members 16U and 16D are mounted on the upper and lower surfaces of the inner end of the fixing member 12. The upper viscoelastic member 16U is disposed between the fixed member 12 and the upper portion 20B of the movable member 20, and the lower viscoelastic member 16D is disposed between the spacer 23 mounted on the mounting member 22 and the fixed member 12. Are located in The first and second viscoelastic members 14, 16U, 16D are inserted in a compressed state, which will be described later in detail.

First, a case where a navigation body such as a ship vibrates in a vertical direction will be described. When the gyrocompass 6 relatively vibrates in the vertical direction, the base plate 4, the support member 65, and the sleeve 6
6 also oscillates vertically. When the amplitude of the vibration is relatively small, the vibration is absorbed by the elastic force of the first spring 31 and the viscoelastic force of the first viscoelastic member 14. The vertical downward force acting on the gyro compass 6 is applied to the second spring 3
3, transmitted to the shaft 30 and the first spring 31,
Since the spring constant of the second spring 33 is sufficiently larger than the spring constant of the first spring 31, only the first spring 31 expands and contracts.
When the amplitude of the vibration is relatively large, the first rubber 32 comes into contact with the lower washer 26 of the first spring 31. Further, when the shaft 30 moves downward, the second spring 33 contracts until the second rubber 34 contacts the sleeve 66.
Although the upward movement of the shaft 30 is absorbed by the first spring 31, the third rubber 35 is
4 is limited by contact with the lower end.

Next, a case where a navigation body such as a ship vibrates in the horizontal direction will be described. When the gyrocompass 6 relatively vibrates in the horizontal direction, the base plate 4, the support member 65, and the sleeve 6
6 also vibrates in the horizontal direction. Horizontal vibration is shaft 3
0, fixed sleeve 24, U-shaped member 22, movable member 20
And transmitted to the spacer 23. When the amplitude is relatively small, the vibration is absorbed by the viscoelastic force, that is, the shear force of the second viscoelastic bodies 16U and 16D. If the amplitude is relatively large, the cushioning material 25 attached to the movable member 20
Abuts against the fixing member 12 and is prevented from moving further in the horizontal direction.

By the first spring 31, the shaft 30,
The loads of the sleeve 66, the support member 65, the base plate 4, and the gyrocompass 6 are carried. Therefore, when no external force acts on the navigation body or the gyrocompass, a load in the vertical direction, that is, a shearing force does not act on the first viscoelastic body 14.

In this embodiment, the vibration in the vertical direction is absorbed by the elastic force of the first and second springs 31 and 33 and the viscoelastic force or shear force of the first viscoelastic member 14, and the vibration in the horizontal direction is It is absorbed by the viscoelastic force of the second viscoelastic bodies 16U and 16D and the buffering force of the buffer material 25. Also in the present example, the vertical position of the center of gravity of the movable portion including the gyrocompass 6, the support member 65, the four vibration dampers, and the movable member 20 is arranged on a horizontal plane passing through the buffer material 25.

As described above, the first and second viscoelastic bodies 1
4, 16U and 16D are inserted in a compressed state. This will be described. When the viscoelastic body is compressed in advance, the rigidity increases in the compression direction, and performs the same operation as the rigid body or the viscoelastic body having high rigidity in the compression direction. However, the shear characteristics in the direction perpendicular to the compression direction do not change much. In this example, the first viscoelastic body 14 absorbs vertical vibration or impact by a shear force, that is, a shear resistance force. The first viscoelastic body 14 is pre-compressed in the horizontal direction. Second viscoelastic body 16U, 16D
Absorbs horizontal vibrations or shocks due to shearing or shearing resistance. The second viscoelastic bodies 16U, 16D are pre-compressed in the vertical direction. The direction of the shearing force for absorbing the vibration or the shock is perpendicular to the pre-compression direction of the viscoelastic bodies 14, 16U, 16D. Therefore, the viscoelastic bodies 14, 16U,
Since the damping characteristics of the 16D vibration are different in the compression direction and the shear direction, no vibration coupling occurs.

In the above example, the first and second rubbers 32,
34 is made of hard rubber. First and second viscoelastic members 1
4, 16U and 16D are made of a polymer viscoelastic material, and such a polymer viscoelastic material includes natural rubber, synthetic rubber, polymer, silicone rubber, silicone gel and the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope of the invention described in the appended claims. Will be understood by those skilled in the art.

[0035]

According to the present invention, even if an impact or a rapid motion is applied to a mechanical gyro mounted on a ship or the like, unnecessary torque is applied to a drive device provided around the vertical axis provided in the gyro. There is no effect.

According to the present invention, the viscoelastic body has high rigidity in the direction perpendicular to the direction of the shearing force for absorbing the vibration. There is an effect that vibration (coupling) is not caused in the direction.

[Brief description of the drawings]

FIG. 1 is a view showing an entire vibration damping device for a gyrocompass according to the present invention.

FIG. 2 is an explanatory diagram for explaining an operation of the vibration damping device for a gyro compass of the present invention.

FIG. 3 is a view showing one of the vibration damping members of the vibration damping device for a gyro compass of the present invention.

FIG. 4 is a diagram showing the entirety of a conventional vibration damping device for a gyrocompass.

FIG. 5 is a view showing one of the vibration damping bodies of a conventional vibration damping device for a gyrocompass.

FIG. 6 is an explanatory diagram for explaining the operation of a conventional anti-vibration shock absorber for a gyrocompass.

[Explanation of symbols]

2 mounting member 4 base plate 6 gyro compass 10-1, 10-2, 10-3, 10-4
... Vibration damping body, 12 ... Fixing member, 14 ... 1st
Viscoelastic member, 16U, 16D ... second viscoelastic member, 20 ... movable member, 22 ... mounting member (U
23) Spacer, 24 ... Fixed sleeve, 25 ... Buffer material, 26 ... Washer, 30 ...
Shaft, 31 ... 1st spring, 32 ... 1st rubber, 33 ... 2nd spring, 34 ... 2nd rubber,
40-1, 40-2, 40-3, 40-4 ... anti-vibration buffer, 41 ... shaft, 42 ... cup, 43 ...
1st spring, 44 ... 1st rubber, 45 ... 2nd spring, 46 ... 2nd rubber, 47 ... 3rd spring,
48: third rubber, 49: washer, 51: friction plate, 52: slide bearing, 53: washer, 54: adjusting screw, 60: support member, 61・ ・
・ Leaf spring, 62 ・ ・ ・ Stopper, 65 ・ ・ ・ Support member,
66 ・ ・ ・ Sleeve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01C 19/16 G01C 19/16 (72) Inventor Yasunori Yagisawa 2--16-46 Minami Kamata, Ota-ku, Tokyo In Tokimec Co., Ltd. (72) Inventor Noboru Itakura 2-16-46 Minami Kamata, Ota-ku, Tokyo F-term in Tokimec Co., Ltd. (Reference) 3J048 AA01 AC05 AD11 BA05 BC02 BD08 DA03 DA04 EA13 EA37

Claims (9)

[Claims] 1. A fixed portion on the navigation body side, a movable portion supporting a gyrocompass and movable in a horizontal direction with respect to the fixed portion, and an attenuation for attenuating a horizontal movement of the movable portion with respect to the fixed portion. Device, wherein the fixed part and the movable part have an annular part arranged on concentric circles having different radii from each other, and the movable part is caused by rapid movement of the navigation body or the gyro compass. When moving in the horizontal direction relative to the fixed portion, the annular portion of the movable portion abuts on the annular portion of the fixed portion, thereby preventing horizontal movement of the navigation body or the gyrocompass. A vibration damping device for a gyro compass, which is configured as described above. 2. A fixed member attached to a mounting portion of a navigation body, a movable member movable in a horizontal direction with respect to the fixed member, and a movable member disposed between the fixed member and the movable member, and An attenuation member for attenuating the horizontal movement of the movable member, and a plurality of vibration dampers for supporting the gyrocompass attached to the movable member and for attenuating the vertical vibration thereof, The fixed member and the movable member have annular portions arranged on concentric circles having different radii from each other, and the movable member is horizontally positioned with respect to the fixed member due to a sudden movement of the navigation body or the gyrocompass. When the movable member or the gyro compass is moved relatively in the direction, the movable member or the gyro compass is prevented from moving horizontally by the annular portion of the movable member abutting on the annular portion of the fixed member. A vibration damping device for a gyro compass, wherein the vibration damping device is configured. 3. The annular portion of the fixed member has a diameter larger than that of the annular portion of the movable member, the annular portion of the fixed member is an inner surface of a circular hole, and the annular portion of the movable member is formed of a ring-shaped member. 3. The vibration damping device for a gyro compass according to claim 2, wherein the vibration isolating device is an outer peripheral surface. 4. The vibration damping device for a gyro compass according to claim 2, wherein a shock absorbing member for absorbing an impact is provided on the annular portion of the movable member or the annular portion of the fixed member. 5. The vertical position at which the annular portion of the movable member and the annular portion of the fixed member contact each other is the same as the vertical position of the center of gravity of the gyrocompass. Vibration damping device for gyrocompass. 6. The vibration damping device for a gyro compass according to claim 2, wherein the damping member includes a viscoelastic material. 7. The vibration damping device for a gyro compass according to claim 6, wherein the viscoelastic material is compressed in advance in a direction perpendicular to a moving direction of the movable member. 8. The gyrocompass according to claim 2, wherein the vibration damping body has an elastic member and a viscoelastic member for absorbing vibration in a direction perpendicular to the moving direction of the movable member. For vibration damping device. 9. A vibration damping device for a gyro compass according to claim 8, wherein said viscoelastic member is compressed in advance in a moving direction of said movable member.