JP2002048188A - Anti-vibration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution member of construction machine in which a noise level is effectively reduced, cost is lowered, and durability is high. SOLUTION: In the constitution member of construction machine, a laminated sheet is spreaded and attached by bolt joint or welding at a plurality of positions. In other cases, the constitution members are constructed with the laminated sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vibration damping device,
In particular, while efficiently reducing noise, low cost,
Further, the present invention relates to a durable vibration damping device for a construction machine.

[0002]

2. Description of the Related Art Conventionally, as a vibration damping device for a construction machine, a device in which a vibration damping member made of a viscoelastic material such as rubber or resin is attached to a component member of the construction machine is known. This utilizes the fact that the attached vibration damping member can be forcibly deformed such as bending or expansion and contraction as the component moves during vibration. In other words, when deformed, the damping member generates an internal loss (kinetic energy loss due to the viscosity of the viscoelastic body),
By dissipating vibration energy, which is a source of noise, as heat energy, a vibration damping effect is exhibited to reduce noise.

[0003] Further, as prior art of other vibration damping devices,
For example, Japanese Utility Model Laid-Open Publication No. 55-174082 discloses a shoe plate (crawler belt) of a tracked vehicle having a vibration damping means utilizing friction loss, that is, a vibration damping member attached to the back side thereof. According to this, one end of the damping member (for example, a spring steel plate) is fixed to the back surface of the shoe plate with bolts or the like, and the other end is attached to the shoe plate while being strongly pressed (not fixed). Then, when the shoe plate vibrates, the friction caused by the relative position shift between the other end of the damping member and the shoe plate causes
The vibration energy of the shoe plate is dissipated as heat energy, the vibration is attenuated, and the noise is reduced.

[0004]

However, the above conventional vibration damping device has the following problems. In an apparatus using a viscoelastic damping member, it is necessary to increase the thickness of the damping member in order to obtain an effective noise reduction effect, and the thickness of the damping member is two to three times the plate thickness of the component to be adhered. It is required that there be the above. In the case of a construction machine, the required thickness of the damping member is about 10 to 50 mm because the thickness of the target component is several mm to more than ten mm. For this reason, the vibration damping member, which is an expensive special material, requires a large plate thickness, so that the vibration damping member is more expensive, and a predetermined size is set at a place where the vibration damping member is adhered in order to avoid interference with other members. Therefore, there is a problem that the size of the apparatus increases.
In addition, viscoelastic materials such as rubber and resin, which are materials of vibration damping members, are generally susceptible to deterioration due to sunlight, wind, rain, vibration, impact and abrasion, and are used at various outdoor sites such as construction machines. In such a case, there is a problem that there is no durability.

The configuration in which one end of the corrugated spring steel plate is pressed with a bolt or the like and attached to the shoe plate has a problem of poor durability as described below. Due to the structure in which the corrugated plate is fixed and pressed only at one end, in the shoe plate, gravel easily enters the gap between the spring steel plate and the shoe plate, and the noise reduction effect is easily lost. That is, when sand and gravel enter, the spring steel plate is deformed and the gap becomes large, and the other end of the spring steel plate is separated from the shoe plate and frictional force is lost, so that noise cannot be reduced. In addition, other than the shoe, the same problem occurs when the vibration damping means is provided on other undercarriage components and components such as buckets and blades that frequently come in contact with earth and sand or rocks. Further, when the vibration damping means is provided on a boom, an arm, a cabin, or the like, a corrugated plate is exposed at a prominent place on the outside of the construction machine.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a vibration damping device which can reduce noise efficiently, is inexpensive, does not impair the aesthetic appearance, and is durable.

[0007]

In order to achieve the above object, a vibration damping device according to the present invention has a laminated plate in which a plurality of plates are partially connected, and the laminated plate is mechanically mounted. Characterized in that it is partially coupled to the member of (1). Further, a member of a machine may be constituted by the laminated plate. Further, it is desirable that the partial connection between the plurality of plates and the partial connection between the outer plate of the laminated plate and the member of the machine be at least one of bolting, plug welding, and full circumference welding.

According to the above construction, first, the laminated plate is partially connected to the noise generating portion (vibrating portion). Therefore, when the noise generating portion vibrates, the space between the vibrating portion and the laminated plate and the plate constituting the laminated plate are formed. A minute positional deviation or a gap occurs between them. These minute displacements and gaps are generated one after another while constantly changing, so that friction and collision between the plates are repeated. Therefore,
The vibration energy of the noise generating unit is converted into heat energy by these frictions and collisions and dissipated, so that the vibration can be reduced and the noise can be reduced. At this time, the laminated plates convert vibration energy into heat energy by a principle different from the internal loss of the conventional vibration-damping member made of a viscoelastic body, that is, by friction or collision between the plates as described above.
A sufficient noise reduction effect can be obtained even when the thickness of each of the laminated plates is reduced to a laminating height substantially equal to or less than the original thickness of the vibrating portion (base material). Therefore, it is possible to avoid an increase in the size of the device due to the attachment of the vibration damping member using the conventional viscoelastic body. The plate to be laminated is not made of a special material such as a viscoelastic body, but is made of ordinary steel, aluminum, SUS or F
Since a material having a friction coefficient equal to or more than a predetermined value such as RP (reinforced plastic material) may be used, cost can be reduced. In addition, since the surfaces of the member and the surface of the laminated plate and the surfaces of the plates are substantially in close contact with each other to prevent intrusion of gravel and the like, durability can be improved.

Further, if a configuration is adopted in which some or all of the outer plates of the plurality of plates are replaced with the machine members themselves, the weight can be reduced by the replaced members.

[0010] Further, a partial connection between a plurality of plates,
If the outer plate of the laminate is partially bolted to the machine member, the plate becomes detachable from the member.
Therefore, the level of the noise reduction effect can be freely changed according to the working conditions by removing or attaching the board, or changing the thickness or the material of the board. Also, if the plate is damaged or corroded, it can be easily replaced on site.

If plug welding is used for the partial connection between the plurality of plates and the partial connection between the outer plate of the laminated plate and the machine member, bolts are not used. There is no need to protrude the bolt head or provide a counterbore to sink the bolt head on the surface of the board. Therefore, no irregularities are formed on the surface, and the appearance is improved. Also, by changing the joint depth for each plug welding joint, for example, instead of joining all the plates in a certain joint, joining several plates from the top, such as joining several plates from the top The number and spacing of locations can be varied. Therefore, the frequency band of the noise in which the noise reduction effect is large can be set freely for each plate, and an effective noise reduction effect can be obtained for noise in a wide or a plurality of frequency bands.

If the partial connection between the plurality of plates and the partial connection between the outer plate of the laminated plate and the member of the machine are all-circumferential welding, bolts are not used, so that members and plates are not used. There is no need to protrude the bolt head or provide a counterbore for sinking the bolt head on the surface. Therefore, no irregularities are formed on the surface, and the appearance is improved. In addition, since the part joined by the entire circumference welding is in a sealed state, foreign matter such as muddy water does not enter,
The generation of rust juice can be prevented.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a construction machine according to an embodiment of the present invention. The first to sixth embodiments are examples of application to a bucket of a hydraulic shovel, and the seventh to ninth embodiments are examples of application to an arm of a hydraulic shovel. The tenth embodiment is an example of application to a bucket of a wheel loader, and the eleventh embodiment is an example of application to a blade of a bulldozer. Twelfth
The fourteenth embodiment is an example of application to the underbody of a track-type vehicle,
The fifteenth embodiment is an example of application to a cabin of a general construction machine.

First, a first embodiment will be described with reference to FIG. FIG. 1 is a diagram of a bucket 10 of a hydraulic shovel in which a laminated plate is spread on side plates with bolts, (a) is a perspective view, and (b) is a cross-sectional view taken along line AA of (a). Bucket 1
A predetermined number of thin steel plates 1 on the outer surface of the bucket
3c, and a pressing plate 13b of a predetermined thickness for protecting the steel plate 13c is placed on the outside of the stacking plate 3c.
The laminated plate 13 is formed by tightening together with the bolts 14 and the nuts 15 so that the gap between the holding plate 13b and the holding plate 13b is substantially close to each other. The head of the bolt 14 sinks into a counterbore 13d provided on the holding plate 13b, and the nut 15
Of the bucket. The heads of the outer bolts 14 are sunk to avoid rock damage, and the inner nuts 15 are protruded to prevent damage. However, if durability is the highest priority, both should be sunk counterbore. If priority is given to cost over durability, it is better to project both. When the head of the outer bolt 14 is made to protrude, the counterbore 13d is not required, so that the holding plate 13b can be made thinner and lighter.

Next, the operation will be described. When the side plate 11 vibrates due to elastic deformation, this is transmitted from the bolted portion, so that each steel plate 13c also vibrates due to elastic deformation, and a minute delay due to a propagation delay and a difference in rigidity between the side plate 11 and the steel plate 13c and between the steel plates 13c. Sliding with gaps and gaps. As long as the vibration continues, the minute displacement and the gap are generated one after another while constantly changing, so that friction and collision between them are repeated. Then, the side plate 1
The vibration energy 1 is converted into heat energy by these frictions and collisions and is dissipated. Therefore, the side plate 11
Can be reduced, and the noise radiated from the side plate 11 can be reduced.

In other words, each plate vibrates according to the restraint condition, and generates a small relative displacement between the plates, thereby causing friction and collision between the plates. The vibration or energy is converted into heat energy by the friction or collision, so that vibration causing noise can be attenuated. In particular, when the degree of close contact between the plates is increased, the vibration between the plates can be attenuated more efficiently, mainly due to the friction between the plates, rather than the collision phenomenon caused by the formation of a gap between the plates. Also here
By changing the interval between the bolts 14, that is, the coupling interval between the laminated plates 13, noise in a predetermined frequency band can be reduced. In general, it is known that a mechanical structure has a plurality of resonance frequencies, and a vibration deformation pattern at the time of resonance has a more complicated shape as the resonance frequency increases. Taking bending vibration as an example, as the frequency becomes higher, vibration deformation with a smaller bending radius appears. The laminated plate vibrates following a small bending radius, and it is necessary to reduce the coupling interval between the laminated plates in order to efficiently attenuate the vibration by the frictional force. On the other hand, in a low-frequency vibration having a large bending radius, a larger relative displacement can be obtained when the coupling interval is longer than when the coupling interval is shorter. Therefore, the vibration can be more efficiently attenuated by increasing the coupling interval. In other words, if the main purpose is to reduce high-frequency noise, the coupling interval should be short, and if the main purpose is to reduce low-frequency noise, the coupling interval should be long. Can be obtained.

In this embodiment, since the laminated plate 13 is bolted, the laminated plate 13 can be freely attached and detached.
Therefore, the laminated plate 13 can be easily replaced at the time of damage, and the number of the steel plates 13c can be freely changed. As the number of steel plates 13c increases, the frequency of friction and collision increases, and the noise reduction effect increases.

According to such a first embodiment, the side plate 1
By connecting the laminated plate 13 to the lamination 1, vibration energy is dissipated due to friction or collision of the laminated plate 13 and noise can be greatly reduced. Further, since a cheap ordinary steel plate is sufficient without using an expensive vibration damping member as in the related art, the cost is low and the durability is high. In addition, since the noise frequency band to be reduced can be adjusted by the coupling interval of the laminated plates 13 and the noise level can be adjusted by the number of laminated plates, the noise can be finely and efficiently reduced according to various vibration states of the side plate 11. be able to. Further, the side plate 11, the steel plate 13c, and the holding plate 13b are substantially in close contact with each other, and sand and gravel intrude into each other to deform the steel plate 13c or widen the gap to reduce the frictional force. Because it prevents it, it has excellent durability.

A second embodiment will be described with reference to FIG. FIG. 2 is a diagram of a bucket 20 of a hydraulic shovel, in which the laminated plate members are joined by bolts and used as side plates,
(A) is a perspective view, (b) is AA sectional drawing of (a). A predetermined number of thin steel plates 23c are sandwiched between two holding plates 23a and 23b, and the bolts 24 and nuts 25
To form a laminated plate 23, which is used as a side plate of the bucket 20. The heads of the nut 25 and the bolt 24 are sunk in counterbore 23d, 23e provided on the holding plates 23a, 23b on both sides, respectively. The inner pressing plate 23a is provided on the bottom plate 26 of the bucket 20 and the side edge member 27 of the bucket 20, and the outer pressing plate 23b is provided on the side edge member 27.
And each is welded.

According to this embodiment, the first type described with reference to FIG.
In addition to the effects of the embodiment, since the steel plate 23c is protected by the two holding plates 23a and 23b, which are the side plates of the bucket 20, the thickness of the entire side plate portion can be reduced and the weight can be reduced. That is, in the first embodiment, the steel plate 13
Since c is outside the side plate 11, it is necessary to protect the steel plate 13c from an external force with the thick pressing plate 13b, and this thickness does not contribute to the strength as the side plate, resulting in "wasteful thickness" and an increase in weight. I was According to the present embodiment, the steel plate 23c
Is protected by the two pressing plates 23a and 23b on both sides, so that the pressing plate only for protecting the steel plate is eliminated and the side plate portion can be made thinner and lighter. However, unlike the first embodiment, since the pressing plates 23a and 23b on both sides have welds, the laminated plate 23 cannot be disassembled only by removing the bolt 24, and it is difficult to replace the steel plate or change the number of steel plates. Becomes

A third embodiment will be described with reference to FIG. FIG. 3 is a diagram of a bucket 30 of a hydraulic shovel, in which the laminated plate members are joined by plug welding and used as side plates,
(A) is a perspective view, (b) is AA sectional drawing of (a). A predetermined number of thin steel plates 33c are sandwiched between two holding plates 33a and 33b, and the two holding plates 33a and 33b are laminated.
b and all the steel plates 33 c are joined by a plurality of plug welding joints 34 to form a laminated plate 33, which is used as a side plate of the bucket 30. At the same time, the laminated plate 33 also has a plug welding joint for changing the depth so as to join only the outer pressing plate 33a and the fewer than the predetermined number of steel plates 33c adjacent thereto. For example, only the outer two of the four plug welding joints 35 in the figure are joined to the outer pressing plate 33a.

According to the present embodiment, the two holding plates 33a and 33b constituting the laminated plate 33 and the plurality of steel plates 33c can be overlapped and welded at one time, which facilitates assembly. Also,
Since the bonding can be performed at the center of the plate, the bonding strength is improved. In addition, since no bolt is used for the connection, there is no need to project the bolt head or provide a counterbore for sinking the bolt head. Therefore, the surface of the laminated plate 33 becomes smooth, and the appearance is improved. Also, by changing the joint depth for each plug welding joint, for example, instead of joining all steel plates at a certain joint, joining several steel plates from the outside, for example, joining each steel plate The number and spacing of locations can be varied. Therefore, the frequency band of the noise that increases the noise reduction effect can be set freely for each steel plate, and an effective noise reduction effect can be obtained for noise in a wide or a plurality of frequency bands. In the first and second embodiments in which the laminated plate is formed by bolt connection, the noise reduction effect can be improved as described above by providing the plug welding joint.

A fourth embodiment will be described with reference to FIG. FIGS. 4A and 4B are views of a hydraulic shovel bucket 40 in which the laminated plate members are joined by plug welding to form side plates 43 and a bottom plate 46, respectively. FIG. 4A is a perspective view, and FIG.
(C) is a BB sectional view of (b). The difference from the third embodiment is that a laminated plate is used not only for the side plate 43 but also for the bottom plate 46, and a greater noise reduction effect can be obtained by increasing the total area of the laminated plate.

A fifth embodiment will be described with reference to FIG. FIGS. 5A and 5B are diagrams of a bucket 50 of a hydraulic shovel in which the laminated plate members are joined by fillet welding around the entire circumference and used as side plates, wherein FIG. 5A is a perspective view, and FIG. It is A sectional drawing. A predetermined number of thin steel plates 53c are sandwiched between two holding plates and laminated, and the two holding plates 53a, 53b and all the steel plates 53c are joined at the outer peripheral portion by a full-round fillet weld joint to form a laminated plate 53. This is used as a side plate of the bucket 50.

According to the present embodiment, there is an effect that rust juice is not generated as compared with the first to fourth embodiments. Pressing plates 53a, 53b, steel plate 53c, and steel plate 5
Since the surfaces where the members 3c are in contact with each other always generate friction, even if a coating or an oxide film is applied as a rust preventive measure, they are immediately peeled off, and rust juice is easily generated. By welding the outer peripheral portion to the entire periphery, these surfaces are kept in a sealed state, so that invasion of foreign substances such as muddy water can be cut off, and generation of rust juice can be prevented.

A sixth embodiment will be described with reference to FIG. FIG. 6 is a diagram of a bucket 60 of a hydraulic shovel, in which the stacked plate members are joined by fillet welding around the entire circumference, and a viscoelastic member, for example, a rubber sheet is sandwiched between the plate members to form a side plate. (A) is a perspective view, (b) is AA sectional drawing of (a). A viscoelastic rubber sheet 63d is sandwiched between two thin steel plates 63c, 63c from both sides, and further sandwiched between two holding plates 63a, 63b from both sides.
3a and the steel plate 63c and between the holding plate 63b and the steel plate 63c
Are joined at the outer periphery with a fillet weld joint at the entire periphery to form a laminated plate 63, which is used as a side plate of the bucket 60.

According to this embodiment, the operation of the first to fifth embodiments, that is, the pressing plates 63a and 63b and the steel plate 6
Since the kinetic energy loss effect due to the viscosity of the rubber sheet 63d is obtained in addition to the kinetic energy loss effect due to the friction between the rubber sheet 3c and the rubber sheet 3d, an even greater noise reduction effect is obtained. Further, as in the fifth embodiment, the outer peripheral portions are all-around fillet welded to keep the surfaces between the holding plates 63a, 63b and the steel plate 63c in a sealed state. Occurrence can be prevented. Since the rubber sheet 63d and the steel plate 63c are brought into close contact with each other due to viscoelasticity, the generation of rust juice can also be prevented.

FIG. 7 shows the shape of the welded joint between the laminated plate (side plate) and the bottom plate so that the generation of rust can be prevented without welding the steel plate all around as in the fifth and sixth embodiments. An example will be described. (A) is obtained by bending the edge of the outer pressing plate 72a inward and welding it together with the edge of the inner pressing plate 71a. (B) is the one in which the outer pressing plate 72b is fillet welded to the inside and the outside of the bottom plate 73, and the inner pressing plate 71b is fillet welded to the inside of the bottom plate. (C) shows that the edge of the inner pressing plate 71c is bent outward and is I-shaped welded to the outer pressing plate 72c, and this bent portion is flared to the inside of the bottom plate 73 and the edge of the bottom plate 73 is pressed to the outer pressing plate 72c. Are welded in an I-shape. (D) is a simplified version of (b), in which fillet welding between the outer holding plate 72d and the inside of the bottom plate 73 is omitted to facilitate assembly. (E) shows the outer holding plate 72e and the inner holding plate 71e welded to the inside of the bottom plate 73 by I-type welding. From the viewpoint of ease of assembly, (d) or (e) is preferable as the embodiment. On the other hand, if the strength is emphasized, it is advantageous that the length of the welding leg can be lengthened (d). If the emphasis is placed on reducing the excavation resistance, the advantage (e) without the projection is advantageous.

Further, a seventh embodiment described with reference to FIG. 8 may be adopted. FIG. 8 is a diagram of a hydraulic shovel bucket 38 formed by welding a frame member 37 so as to border an outer peripheral portion of a laminated plate 33k joined by plug welding and welding the frame member 37 to a bottom plate 36. FIG. 3A is a perspective view, FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A, and FIG. 3C is a cross-sectional view taken along line BB of FIG. Laminated plate 33k by frame member 37
By preventing the intrusion of muddy water and the like, the generation of rust juice can be prevented. Further, the frame member 37 facilitates securing rigidity and assembling of the entire bucket.

The eighth to tenth embodiments are examples of application to an arm of a hydraulic shovel. The eighth embodiment will be described with reference to FIG. FIG. 9 is a diagram of the arm 80 of the hydraulic excavator in which the laminated plate is spread on the side plates with bolts, (a) is a perspective view, (b) is a cross-sectional view cut along the Z plane in (a),
(C) is a detailed view of the bolt mounting portion. Arm side plate 8
A plurality of sheets 82 are welded to the outer surface of one arm,
A predetermined number of thin steel plates 83a are laminated on the outer surface of the arm 1 and a pressing plate 83b is further superimposed thereon, and the bolts 84 are attached to the sheet 8
The laminated plate 83 is formed by screwing together and fastening together.

The ninth embodiment will be described with reference to FIG. FIG. 10 is a view of an arm 90 of a hydraulic shovel in which a laminated plate is spread on a side plate with bolts, (a) is a perspective view,
(B) is a cross-sectional view cut along the Z plane in (a), and (c) is a detailed view of a bolt mounting portion. A plurality of tap holes 91a are provided in the side plate 91 of the arm 90, and a predetermined number of thin steel plates 93a are laminated on the outer surface of the arm of the side plate 91.
The laminated plate 93 is formed by stacking 3b and screwing a bolt 94 into the tap hole 91a and tightening them together. According to the present embodiment, as compared with the eighth embodiment, although the strength of the arm is reduced by providing the tap holes, the number of components is reduced, so that the cost can be reduced.

The tenth embodiment will be described with reference to FIG. FIGS. 11A and 11B are diagrams of an arm 100 of a hydraulic shovel, in which laminated plate members are plug-welded and used as side plates, wherein FIG. 11A is a perspective view, and FIG. FIG. A predetermined number of thin steel plates 103c are sandwiched between the two holding plates 103a and 103b, and they are laminated and plug-welded (or bolted) to form a laminated plate 103.
And this is used as the 100 side plate of the arm. Not only the side plates but also the upper surface plate 104 and / or the lower surface plate 105 may be a laminated plate.

FIGS. 12 and 13 show an eleventh embodiment in which a laminate is spread on a bucket of a wheel loader and a twelfth embodiment in which a laminate is spread on a blade of a bulldozer. Each of the laminated plates 113a and 113 is formed by laminating a plurality of steel plates having a predetermined thickness on the back surface of the bucket 110 or the blade 120 and by bolting or welding.
By spreading 3b, 113c or 123, it is possible to minimize the possibility of damage due to earth and sand while increasing the area of the laminate, thereby obtaining a large noise reduction effect and improving the durability of the laminate. .

Referring to FIG. 14, a thirteenth embodiment in which a laminate is spread on a front idler of a crawler type vehicle will be described. As shown in the figure, in the present embodiment, laminated plates 133 and 134 are spread on the side surface of the front idler 130, and the laminated plates 133 and 134 are formed by welding a plurality of steel plates having a predetermined thickness by plug welding. It is to be joined at the bonding interval of. The present embodiment can be applied to an existing front idler.

Based on FIG. 15, a first laminated sheet is spread on a final drive case (or hub) of a crawler type vehicle.
Fourth embodiment will be described. As shown in the figure, in the present embodiment, the final drive case (or hub) 1
40 and the final drive case (or hub) 1
The laminated plate 144 is spread on the surface of the cylindrical portion 40, and the laminated plates 143a, 143b, and 144 are formed by joining a plurality of steel plates having a predetermined thickness at predetermined bonding intervals by plug welding.

Further, as in the fifteenth embodiment shown in FIG. 16, the main body of the final drive case (or hub) of the crawler type vehicle may be constituted by a laminated plate. FIGS. 16A and 16B are views of a final drive case (or hub) 150 in which the main body is formed of a laminated plate, wherein FIG. 16A is a cross-sectional view as viewed from the cylindrical surface direction, and FIG. It is. In the present embodiment, the laminated plate 151 and the disk-shaped laminated plate 152 in which a plurality of steel plates are joined together by plug welding are combined with the laminated plate 1.
An annular member 153 serving as a flange of the final drive case (or hub) 150 is welded to the other end of the laminated plate 151.

FIG. 17 shows a sixteenth embodiment in which a laminate is applied to a cabin. As shown in the figure, laminated plates 163 and 164 are spread on the upper plate 161 and the rear plate 162 of the cabin 160, respectively. Laminated boards 163, 164
Instead of spreading the upper surface plate 161 of the cabin 160,
The back plate 162 may be formed of a laminated plate.

As described above, according to the vibration damping device of the present invention, the laminated plate is partially connected to the noise generating section (vibrating section). Between the plates and between the plates constituting the laminated plate. These minute displacements and gaps are generated one after another while constantly changing, so that friction and collision between the plates are repeated. Therefore, the vibration energy of the noise generating part is converted into heat energy by these frictions and collisions,
Since the heat is dissipated, the vibration can be reduced, and the noise can be reduced. At this time, the laminated plate converts the vibration energy into heat energy by the principle different from the internal loss of the conventional viscoelastic vibration damping member, that is, by friction or collision between the plates as described above. A sufficient noise reduction effect can be obtained even when the thickness of each plate is reduced to a lamination height substantially equal to or less than the original thickness of the vibrating portion (base material).
Therefore, it is possible to avoid an increase in the size of the device due to the attachment of the vibration damping member using the conventional viscoelastic body. Further, the plate to be laminated is not made of a special material such as a viscoelastic body, but may be made of ordinary steel plate, aluminum, SUS or FRP (reinforced plastic material) or the like having a friction coefficient of a predetermined value or more. it can. Moreover, between the surface of the member and the surface of the laminated plate and between the surfaces of the plate are substantially in close contact with each other,
Since the intrusion of sand and gravel is prevented, the durability can be improved.

In addition, if some or all of the outer plates of the plurality of plates are replaced with the machine members themselves, the weight can be reduced by the replaced members.

Further, a partial connection between a plurality of plates,
If the outer plate of the laminate is partially bolted to the machine member, the plate becomes detachable from the member.
Therefore, the level of the noise reduction effect can be freely changed according to the working conditions by removing or attaching the board, or changing the thickness or the material of the board. Also, if the plate is damaged or corroded, it can be easily replaced on site.

If the partial connection between the plurality of plates and the partial connection between the outer plate of the laminated plate and the machine member are plug welding, bolts are not used, so that the machine member and There is no need to protrude the bolt head or provide a counterbore to sink the bolt head on the surface of the board. Therefore, no irregularities are formed on the surface, and the appearance is improved. Also, by changing the joint depth for each plug welding joint, for example, instead of joining all the plates in a certain joint, joining several plates from the top, such as joining several plates from the top The number and spacing of locations can be varied. Therefore, the frequency band of the noise in which the noise reduction effect is large can be set freely for each plate, and an effective noise reduction effect can be obtained for noise in a wide or a plurality of frequency bands.

If the partial connection between the plurality of plates and the partial connection between the outer plate of the laminated plate and the member of the machine are all-around welding, bolts are not used, so that the members and plates are not used. There is no need to protrude the bolt head or provide a counterbore for sinking the bolt head on the surface. Therefore, no irregularities are formed on the surface, and the appearance is improved. In addition, since the part joined by the entire circumference welding is in a sealed state, foreign matter such as muddy water does not enter,
The generation of rust juice can be prevented.

The mounting position of the laminated board effective for noise reduction was found from the experimental results as follows. In the case of a bucket, it is effective to attach the laminated plate to the center of the side surface. In the case of an arm, it is effective to attach the laminated plate mainly at the center, and for high frequency components, it is effective to attach the laminated plate from the base.

[Brief description of the drawings]

FIG. 1 is a diagram of a bucket of a hydraulic shovel according to a first embodiment of the present invention, in which a laminated plate is spread on side plates with bolts, (a) is a perspective view, and (b) is A in (a). It is -A sectional drawing.

FIG. 2 is a diagram of a bucket of a hydraulic shovel according to a second embodiment of the present invention, in which laminated plate members are bolted and used as side plates, (a) is a perspective view, and (b) is (a). A)
It is -A sectional drawing.

3A and 3B are diagrams of a bucket of a hydraulic shovel according to a third embodiment of the present invention, in which laminated plate members are joined by plug welding and used as side plates, wherein FIG. 3A is a perspective view, and FIG. It is an AA sectional view of (a).

FIG. 4 is a perspective view of a bucket of a hydraulic shovel according to a fourth embodiment of the present invention, in which laminated plate members are joined by plug welding to obtain side plates and a bottom plate, respectively.
(B) is an AA sectional view of (a), and (c) is a B- view of (b).
It is B sectional drawing.

FIG. 5 is a diagram of a bucket of a hydraulic shovel according to a fifth embodiment of the present invention, in which stacked plate members are joined by fillet fillet welding and used as side plates, (a) is a perspective view, (b) is an AA sectional view of (a).

FIG. 6 shows a sixth embodiment of the present invention, wherein the laminated plate members are joined by fillet welding around the entire circumference, and a viscoelastic member is further provided between the plate members;
It is a figure of a bucket of a hydraulic shovel which sandwiched a rubber sheet and made this a side plate, for example, (a) is a perspective view, (b)
3A is a cross-sectional view taken along line AA of FIG.

FIG. 7 is a view exemplifying a shape of a welded joint between a laminated plate (side plate) and a bottom plate so that generation of rust juice can be prevented without welding a steel plate all around in a bucket of a hydraulic shovel.

FIG. 8 is a diagram of a bucket of a hydraulic shovel according to a seventh embodiment of the present invention, in which the outer peripheral edge of the laminated plate material is a single plate and is used as a side plate, (a) is a perspective view, and (b) is a perspective view; (A) is an AA sectional view of (a).

FIG. 9 is a view of an arm of a hydraulic shovel according to an eighth embodiment of the present invention, in which a laminated plate is spread on a side plate with bolts;
(A) is a perspective view, (b) is a cross-sectional view cut along the Z plane in (a), and (c) is a detailed view of a bolt mounting portion.

FIG. 10 is a view of an arm of a hydraulic shovel according to a ninth embodiment of the present invention, in which a laminated plate is spread on side plates with bolts, (a) is a perspective view, and (b) is a diagram in (a). FIG. 3C is a cross-sectional view taken along the Z plane, and FIG.

11A and 11B are diagrams of an arm of a hydraulic shovel according to a tenth embodiment of the present invention, in which stacked plate members are plug-welded and used as side plates, where FIG. 11A is a perspective view, and FIG. a) It is sectional drawing cut | disconnected by the Z surface in a figure.

FIG. 12 is a diagram of a bucket of a wheel loader on which laminated boards are spread according to an eleventh embodiment of the present invention.

FIG. 13 is a view of a bulldozer blade with a laminated plate spread thereon according to a twelfth embodiment of the present invention.

FIG. 14 is a diagram of a front idler with a laminated plate spread thereon according to a thirteenth embodiment of the present invention.

FIG. 15 is a view of a final drive case (or hub) on which a laminated board is spread according to a fourteenth embodiment of the present invention.

FIG. 16 shows a final drive case (or hub) according to a fifteenth embodiment of the present invention, in which the main body is formed of a laminated plate.
(A) is a cross-sectional view as viewed from the cylindrical surface direction,
(B) is AA sectional drawing of (a).

FIG. 17 is a view of a cabin to which a laminate is applied according to a sixteenth embodiment of the present invention.

[Explanation of symbols]

11 ... side plate, 13, 33, 53 ... laminated plate, 13b, 23
a, 23b, 33a, 33b, 53a, 53b ... holding plate, 13c, 33c, 53c ... steel plate.

Claims (5)

[Claims] A laminated plate (13) formed by partially joining a plurality of plates (13b, 13c), and the laminated plate (13) is partially joined to a member (11) of a machine. A vibration damping device characterized in that: 2. A laminated plate (13) formed by partially connecting a plurality of plates (13b, 13c), and the laminated plate (13) constitutes a machine member (23a, 23b). A vibration damping device characterized by the above-mentioned. 3. The vibration damping device according to claim 1, wherein a plurality of plates (13b, 13c) are partially connected to each other, and a laminated plate is provided.
(13) the outer plate and the partial connection of the machine member (11),
A vibration damping device characterized by bolting. 4. The vibration damping device according to claim 1, wherein the plurality of plates (33c) are partially connected to each other and the laminated plate (33).
A vibration damping device characterized in that a partial connection between the outer plate and the machine members (33a, 33b) is made by plug welding. 5. The vibration damping device according to claim 1, wherein the plurality of plates (53c) are partially connected to each other and the laminated plate (53).
A partial connection between the outer plate and the machine members (53a, 53b) by welding all around.