JP7025136B2 - Vibration control housing - Google Patents

Description

The present invention relates to a structure of a housing in which an electronic device or the like is housed, and particularly relates to a technique effective for improving the vibration resistance of a control panel housing mounted on a moving body such as a vehicle or a ship.

The control panel installed on a moving body such as a vehicle or a ship via a rubber bush or the like swings due to the action from the moving body, and eventually cracks may occur in the welded portion due to aging fatigue. This causes a decrease in the rigidity of the housing, and the housing is deformed beyond the range of the design value, causing unexpected dust and moisture to enter, causing rust and electrical failure due to poor insulation.

For example, a control panel for an electrically driven dump truck such as a mining truck is a structure having a weight of several tons, and is usually installed on the body frame of the dump truck. Since dump trucks are often used continuously in environments where the road surface is not maintained, such as at mining sites for mineral resources, the force that strongly shakes the control panel back and forth, left and right, and up and down is constantly applied when the dump truck is in operation. , The control panel housing frame may crack.

Further, the control panel for a dump truck is generally supported only on the bottom surface, and is in the form of a so-called cantilever, so that the load on the base portion supporting the weight of the control panel is very large. In order to increase the strength of the base part, it is necessary to make the base part more sturdy, but on the other hand, from the viewpoint of maintainability and manufacturability, the weight of the control panel housing can be reduced, the parts of the control panel can be replaced, and the housing frame can be used. It is hoped that repairs, etc. can be easily performed.

In addition, seismic resistance is required for the housing for electronic devices, which is assumed to be one of the applications of the present invention, and the seismic standards specified by IEC (International Electrotechnical Commission), JIS, etc. It is designed according to the above. In housing design, it is necessary to minimize the weight with strength as a constraint, but in general, increasing the strength of the housing also increases the weight, and the increase in weight increases manufacturing, transportation, installation costs, etc. The price will be higher. In order to keep the cost burden of consumers low, it is important to secure the strength of the housing without increasing the weight as much as possible.

As a background technology in this technical field, for example, there is a technology such as Patent Document 1. Patent Document 1 describes a seismic isolation structure in which a non-seismic isolation structure building and a seismic isolation structure building are connected by a connected seismic isolation device, and an example thereof is shown in FIGS. 3, 8, and 9.

Further, in Patent Document 2, a vibration control structure of a building in which an oil damper is attached at an angle of 45 ° in a horizontal plane with respect to an opposing wall between two buildings having different vibration characteristics fixed on a foundation. There is a description about, and an example thereof is shown in FIGS. 1, 2, and 4.

Further, Patent Document 3 describes a seismic control structure in which two adjacent structures are connected by a seismic control structure composed of a plurality of X-shaped combinations of two seismic control devices. Yes, an example of which is shown in FIGS. 1 and 2.

Further, in Patent Document 4, for two buildings A and B having the same height and natural period, a rotational inertia mass damper is added to the building A, and the building A and the other building B are described. There is a description of a connected seismic control structure connected by a damper and a spring, and an example thereof is shown in FIGS. 1 and 2. Many of the connected vibration damping structures have been invented for buildings, and are characterized in that the displacement of the building caused by long-period ground motion is reduced by utilizing the mutual weight of the buildings.

Japanese Unexamined Patent Publication No. 2002-266517 Japanese Unexamined Patent Publication No. 11-270188 Japanese Unexamined Patent Publication No. 2004-285599 Japanese Patent No. 5382457

Mining trucks used in the harsh environment mentioned above are often operated continuously day and night except during maintenance and inspection, so regular maintenance and inspection are indispensable, but they want to minimize the time required for maintenance and inspection. There is a request.

In addition, the control panel mounted on the electrically driven dump truck has a waterproof, dustproof, and earthquake-resistant structure, but the risk of failure is higher than that of general electrical products, and the structural strength of the housing frame is also high. Reliability is required. The design issue of the control panel for an electrically driven dump truck is that it does not fail within the product life of the dump truck.

The problem to be solved by the present invention is to suppress deformation and reduce impact force when the control panel swings, and as a constraint condition at that time, a device for suppressing the influence on the maximum speed of the moving body and the load weight. It is to minimize the increase in the weight of the electric parts and to avoid the increase in mechanical damage such as shear stress and torsional stress to the electric parts and their cooling system.

Therefore, an object of the present invention is to provide a vibration-damping housing having high vibration resistance, which can suppress deformation during rocking and reduce impact force while minimizing weight increase in a housing in which an electronic device is housed. To do.

In order to solve the above problems, the present invention is a vibration damping housing installed on a moving body and accommodating a plurality of electronic devices, and is a first base member fixed to the integrated base member and the base member. The housing and the second housing arranged on the base member via the low-rigidity support member are provided, and the first housing and the second housing are arranged adjacent to each other. A damper that restricts the movement of the second housing is provided between the first housing and the second housing, and the damper faces the side surface of the first housing. The movement of the second housing in the direction along the side surface of the second housing is restricted, and the first housing is divided into a first division portion and a second division portion, and the base member. Fixed on top, the second housing is placed between the first division and the second division, and the damper is located between the first division and the second housing, the second. The second division is provided between the two divisions and the second housing, respectively, and when the vibration damping housing as a whole is shaken, the second division is displaced with respect to the displacement of the first division and the second division. The housing is displaced so as to cancel it, thereby suppressing the displacement of the entire vibration damping housing, and the damper is used to relative the first division portion, the second division portion, and the second housing. It is characterized by suppressing displacement .

According to the present invention, in a housing in which an electronic device is housed, it is possible to realize a vibration-damping housing having high vibration resistance, which can suppress deformation during rocking and reduce impact force while minimizing an increase in weight.

Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a schematic block diagram of the vibration damping housing which concerns on one Embodiment of this invention. FIG. 1A is an arrow view in the direction of AA in FIG. 1A. It is a figure which shows an example of the control panel which made it into the conventional integrated housing. It is a figure which shows an example of the dynamic vibration absorber structure. It is a BB'direction arrow view in FIG. 3A. It is a figure which shows an example of the vibration damping model. It is a schematic block diagram of the vibration damping housing which concerns on one Embodiment of this invention. It is a schematic block diagram of the vibration damping housing which concerns on one Embodiment of this invention. It is a schematic block diagram of the vibration damping housing which concerns on one Embodiment of this invention. It is a figure which shows an example of the duct provided in the through hole of FIG. 7A. It is a figure which shows the effect of this invention by the simulation by the analysis model. It is a figure which shows the effect of this invention by the simulation by the analysis model. It is a figure which shows the analysis model used for the simulation. It is a figure which shows the analysis model used for the simulation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same components are designated by the same reference numerals, and the detailed description of the overlapping portions will be omitted.

The vibration damping housing of the first embodiment will be described with reference to FIGS. 1A to 4. 1A is a perspective view showing a schematic configuration of the vibration damping housing of this embodiment, and FIG. 1B is a front view (arrow view in the direction of AA') of the vibration damping housing of FIG. 1A. FIG. 2 is a diagram showing a control panel as a conventional integrated housing shown for comparison. 3A is a diagram conceptually showing the operation of the vibration damping housing of FIG. 1A, and FIG. 3B is a front view (arrow view in the BB'direction) of the vibration damping housing of FIG. 3A. Further, FIG. 4 is a diagram showing a conceptual model of the vibration damping structure of this embodiment.

As shown in FIG. 1A, the vibration damping housing of the present embodiment has, as a main configuration, a base member 101 on which the control panel housing main body is placed, a part 102 of the first housing fixed on the base member 101, and the like. Another part 103 of the first housing fixed on the base member 101, an insulator 104 such as a rubber bush for suppressing vibration transmission, and a second housing arranged on the base member 101 via the insulator 104. The direction along the side surface of the second housing 105 facing each side surface of the body 105 and the first housing 102, 103 (that is, the first housing 102, 103 and the second housing 105 are fronted (that is). It is provided with dampers 108 and 109 that restrict the movement of the second housing 105 in the front-rear direction when viewed from the AA'direction). The first housings 102 and 103 are fixed to the base member 101 by the fixing members 106 and 107, respectively.

1B is a view of FIG. 1A as viewed from directly in front of the housing (direction AA'), in which the second housing 105 is rigidly coupled to the base member 101 or the first housings 102 and 103. It is shown for supplementing FIG. 1A to show how the rubber bushes and the like are connected via the insulators 104 and the dampers 108 and 109.

The conventional general control panel housing has an integrated housing structure as shown in FIG. Conventionally, as shown in FIG. 2, the storage spaces of the base member 201 on which the control panel housing body is placed, the control panel housing bodies 202 and 203 fixed on the base member 201, and the control panel housing bodies 202 and 203 are stored. It is composed of an electric device (electronic device) and the like 204 housed in the electric device (electronic device) and a door 205 for accessing the electric device (electronic device) and the like 204.

In the example of FIG. 2, although the control panel housing main body 202 and 203 are independent housings, they are finally assembled as a product, and in the scene where the product operates, they are rigidly fixed to the base member 201 and have structural strength. The top behaves as a unit. From the viewpoint of manufacturing and installation, or from the viewpoint of mounting and using the control panel on a moving body, weight reduction and space saving are desired, but in order to trade off with strength, experiments and simulations using a computer are desired. We are trying to optimize as much as possible.

However, under various operating conditions, there is a risk of being constantly exposed to strong shaking and unexpected impact vibration, so a safety design with a certain margin is required. Therefore, in particular, the base portion is made thicker, and reinforcing materials are added to various parts to cope with the problem, which is a factor of increasing the weight. Even if the product is designed in this way, if an impact load is repeatedly applied so that the total mass is concentrated at one point (specific location), the member may break due to the accumulation of fatigue. , It will lead to failure and shortened product life.

Therefore, in this embodiment, as shown in FIG. 1A, first, the control panel housing is divided into a plurality of portions to disperse the mass. Here, an example of dividing into two parts, a part of the first housing (first division part) 102 and another part of the first housing (second division part) 103, will be described. On top of that, the difference in the deformation mode between the first housings 102 and 103 and the second housing 105, and the inertial force that the second housing 105 tries to stay in that place when it receives an impact force. , And are used to suppress the amount of deformation of the housing.

The second housing 105 is joined to the base member 101 via a low-rigidity support member (insulator 104) such as a rubber bush, and the low-rigidity-supported second housing 105 and other parts ( A part of the first housing (first divided portion) 102 and another part of the first housing (second divided portion) 103) are provided via dampers 108 and 109 provided on the free end side of the housing. The second housing 105, which is supported by the low rigidity, is suppressed from being displaced by the structure in which the second housing 105 is connected. That is, since the displacement difference due to the difference in the natural period and the displacement difference due to the influence of the inertial force occur between the second housing 105 and the other parts, the dampers 108 and 109 absorb the energy and vibrate with each other. Cancel each other.

3A and 3B are examples of the structure of a dynamic vibration absorber. FIG. 3B is a front view (BB'direction) of FIG. 3A and shows the same structure. A dynamic vibration absorber is a case where a mass body 301 having a natural frequency almost equal to that of the structure is attached to the structure to be vibration-damped by using a suspension 302 and a damper 303, and vibration is applied to the structure to be vibration-damped. In addition, the mass body 301 starts to vibrate due to the resonance action, and the displacement energy gradually moves to the mass body 301 side, so that the displacement of the structure to be vibration-damped is accommodated.

In this embodiment, the second housing 105 supported by the insulator 104 with low rigidity acts like the mass body 301 in the tunned mass damper structure to cancel the displacement, but further, the first one. The dampers 108 and 109 connecting the housings 102 and 103 and the second housing 105 can suppress the relative displacement between the housings.

If the second housing 105 supported with low rigidity is freely vibrated without suppressing the displacement, the displacement may become excessive. Therefore, for example, the relative displacement between the housings is 10 mm or less. As such, it is more desirable to limit by the parameters of the dampers 108 and 109.

FIG. 4 shows a conceptual model of the vibration damping structure of this embodiment. Reference numerals 401, 402, and 403 are mass bodies, and reference numeral 402 thereof corresponds to a second housing 105 joined to the base member 101 via a support member (insulator 104) having low rigidity such as a rubber bush. Here, the damper 404 and the spring 405 are used instead of the insulator 104 such as the rubber bush. Then, 401 and 403 correspond to a part of the first housing (first division) 102 and another part 103 of the first housing (second division) 103, respectively, and the damper 406 is attached to the mass body 402, respectively. The structure is connected to the spring 407 via a spring 407.

As shown in the conceptual model of FIG. 4, the control panel housing of the present embodiment operates in the same manner as the dynamic vibration absorber structure of FIGS. 3A and 3B when the whole is swayed, and the mass bodies 401 and 403. The mass body 402 is displaced so as to cancel the displacement, and the displacement of the entire control panel housing can be suppressed. Further, by the action of the damper 406 and the spring 407, the relative displacement between the mass bodies 401, 402 and 403 can be suppressed.

8A and 8B show the verification results of the effect of the present invention by simulation using each analysis model (No. 1 to No. 5) of FIG. 9A. FIG. 8A shows the change in stress value (maximum principal stress) from the start of vibration in chronological order, and FIG. 8B shows the amount of deformation (relative displacement of the housing corner in the Y direction) from the start of vibration in chronological order. ing.

The analysis by simulation was performed by creating the analysis model shown in FIG. 9B. The control panel housing was divided into three parts vertically, and the central part was used as the low-rigidity support housing. In addition, a mass body assuming an electronic device was placed in each room (storage unit). In the actual control panel, the IGBT unit, rectifier, water cooling unit, etc. are stored, so the weight is not uniform, but if the electronic devices stored in each room have the same weight, resonance is likely to occur, and in verification Due to the stricter conditions, all weights were set to 180 kg. The plate thickness of the steel material, which is the material of the housing, is set appropriately with reference to the actual product, and the low-rigidity support member (insulator) for suppressing vibration from the base member is placed on the bottom surface of the low-rigidity support housing. Elastic rubber (Young's modulus: 2MPa) was used at 4 locations. Since the shaking in the direction parallel to the plane where the housings are adjacent to each other becomes large, the damper arrangement is used here to suppress the shaking in the front-rear direction (Y direction) of the housings.

For vibration to the analysis model, one sine wave with a one-sided amplitude of 0.002 m and a frequency of 100 Hz is given as a forced displacement in the front-back direction (Y direction) and the vertical direction (Z direction) of the housing, respectively, from the start of vibration. The behavior up to 2 seconds later was obtained by linear time history response analysis. The damping model is Rayleigh type damping, and the rigidity proportional damping coefficient (β damping coefficient) for considering minute friction generated inside the structure is set to 0.05.

As a result, as shown in FIG. 8A, the maximum stress was generated 0.011 seconds after the start of vibration in all the analysis cases, and then converged to zero by 2 seconds after that. As for the change in the amount of deformation, as shown in FIG. 8B, it was confirmed that the peak of the amount of deformation appeared in the case of No. 5 with a delay of 0.002 to 0.003 seconds from the other cases.

Table 1 shows the maximum stress value and the maximum deformation amount for each analysis case.

First, comparing the cases of No. 1 and No. 2, No. 2 is a state in which the housing is simply divided into three parts and no dampers are provided, and the maximum stress and maximum deformation are No. The tendency is almost the same as 1 (conventional control panel housing). No. 2 has a slightly larger value due to the difference in eigenvalues, but the difference is small compared to other analysis cases.

Next, looking at the effect of the presence or absence of a low-rigidity support member (insulator), in the cases of No. 2 and No. 4, the maximum stress is reduced by 23%, the maximum deformation is reduced by 29%, and In the cases of No. 3 and No. 5, the maximum stress is reduced by 33% and the maximum deformation is reduced by 48%, so it is considered that the low-rigidity support member (insulator) has the effect of reducing stress and deformation.

Furthermore, looking at the effects of the presence and absence of dampers, in the cases of No. 2 and No. 3, the maximum stress was reduced by 21%, the maximum deformation was reduced by 26%, and No. 4 and No. Even in case 5, the maximum stress is reduced by 32% and the maximum deformation is reduced by 46%, so it is considered that the damper also has the effect of reducing stress and deformation.

Comparing the cases of No. 1 and No. 5 (best mode in which the housing is divided into three parts and a low-rigidity support member and damper are used together), the maximum stress is reduced by 45% and the maximum deformation is reduced by 59%. Of the five analysis cases, both the maximum stress and the maximum deformation are the minimum, so it is considered that there is an effect of using the low-rigidity support member (insulator) and the damper together.

From the above results, it was confirmed that stress and deformation can be reduced by using the difference in deformation mode and inertial force by dividing the control panel housing into multiple parts and using a rigid support member (insulator) and damper together. did it. When subjected to short-period vibration such as impact load, the housing supported with low rigidity has a short displacement delay due to the influence of inertial force, which causes the displacement of the housing fixed to the base member. Suppress. At this time, the stop time (time until the maximum deformation) is extended, so that the impact acceleration is reduced. The reason why the peak of the amount of deformation appears in the case of analysis result No. 5 with a delay of 0.002 to 0.003 seconds from the other cases is considered to be due to the reproduction of this behavior.

As described above, according to the present embodiment, the control panel housing is divided into a plurality of parts, and the amount of deformation of the housing is suppressed by controlling the vibration by utilizing the difference in the deformation mode and the inertial force. Can be done.

In addition, while each of the above patent documents is a mechanism for suppressing displacement mainly for long-period vibration such as an earthquake by a connected vibration damping structure, in this embodiment, a housing supported with low rigidity is used. It acts as an auxiliary mass body in the dynamic vibration absorption structure to cancel the vibration, and the housing supported by low rigidity has a short displacement delay due to the influence of inertial force, and follows the housing fixed to the base member. By displacing the material, it is possible to deal with phase shift killing in short-period vibration such as impact load.

In addition, since it is a passive configuration that does not use an electric actuator or the like, it is possible to minimize the weight increase that affects the maximum speed and load capacity of moving objects such as vehicles and ships. Furthermore, by changing from an integrated housing to a split housing, it is expected that manufacturing and transportation costs will be reduced.

The vibration damping housing of the second embodiment will be described with reference to FIG. FIG. 5 is a perspective view showing a schematic configuration of the vibration damping housing of this embodiment, and is a modification of FIG. 1A.

As shown in FIG. 5, the vibration damping housing of the present embodiment has a second housing 105 for supporting the second housing 105 between the second housing 105 and the base member 101 instead of the insulator 104. It differs from the vibration damping housing of the first embodiment in that it includes a plate-shaped support member 501 having substantially the same area as the bottom surface of the housing 105.

If the support member 501 is made of a material having excellent impact absorption such as butyl rubber, the vibration damping effect is further enhanced, but a general rubber material may also be used. The plate-shaped structural member facilitates construction and can cover the entire bottom surface of the second housing 105, so that the bottom surface structure of the second housing 105 can be made lighter and simpler.

Further, the support member 501 may be made to have anisotropy in displacement with respect to a load as a laminated structure composed of a plurality of layers made of different materials. That is, by limiting the displacement of the second housing 105 mainly in the horizontal direction, vibration damping weighted to the front-back and left-right shaking when accelerating / decelerating or changing the course of a moving body such as a vehicle or a ship can be achieved. It will be possible.

The vibration damping housing of the third embodiment will be described with reference to FIG. FIG. 6 is a perspective view showing a schematic configuration of the vibration damping housing of this embodiment, and is another modification of FIG. 1A.

As shown in FIG. 6, the vibration damping housing of this embodiment is a second housing in a direction (front-back direction) along the side surface of the second housing facing each side surface of the first housing. It is different from the vibration damping housing of the first embodiment in that it is provided with a damper 601 that suppresses the displacement of the second housing 105 in the left-right direction (lateral direction) instead of the dampers 108 and 109 that restrict the movement of the second housing 105.

The dampers 108 and 109 shown in FIGS. 1A and 1B of the first embodiment are in the form of suppressing the displacement in the front-rear direction of the paper surface, but the damper 601 of the present embodiment suppresses the displacement in the left-right direction of the paper surface. The direction of suppressing the displacement may be determined by the direction in which the control panel is installed and how the moving body moves, and if necessary, dampers in the front-back and left-right directions may be used in combination.

The vibration damping housing of the fourth embodiment will be described with reference to FIGS. 7A and 7B. FIG. 7A is a perspective view showing a schematic configuration of the vibration damping housing of this embodiment, and is still another modification of FIG. 1A. FIG. 7B shows an example of the duct 703 provided in the through holes 701 and 702 of FIG. 7A.

As shown in FIG. 7A, the vibration damping housing of this embodiment is between the first housing 102 and the second housing 105, and between the first housing 103 and the second housing 105. It differs from the vibration damping housing of the first embodiment in that each has through holes 701 and 702.

In the control panel, for example, water-cooled pipes and electrical wiring may be arranged across the housing, and as in this embodiment, by providing through holes between the divided housings, the piping and wiring can be placed in the housing. Can be placed across.

This through hole is provided on the side surface of the housing, and for waterproof and dustproof purposes, for example, a duct 703 as shown in FIG. 7B is attached to the through port portion to pass a water-cooled pipe or an electric wiring. It is desirable that the duct 703 is made of a flexible material that does not affect the displacement suppression control of the present invention.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

Further, in each of the above embodiments, the base member is required for manufacturing the housing, but the principle of the present invention is effective even when there is no base member, for example, a moving body such as a vehicle or a ship. The effect of the present invention can also be obtained when the housing is directly installed on the floor without using the base member.

101 ... Base member,
102 ... A part of the first housing (first partition)
103 ... Another part of the first housing (second division)
104 ... Insulator 105 ... Second housing 106, 107 ... Fixed member 108, 109 ... Damper 201 ... Base member 202, 203 ... Control panel housing body 204 ... Electric device (electronic device), etc. 205 ... Door 301 ... (Dynamic) Mass body 302 ... (supporting the mass body of the dynamic vibration absorber) Suspension 303 ... (supporting the mass body of the dynamic vibration absorber) Damper 401, 402, 403 ... Mass body 404 ... (supporting the second housing) ) Damper 405 ... (supporting the second housing) Spring 406 ... (connecting the first housing and the second housing) Damper 407 ... (connecting the first housing and the second housing) ) Spring 501 ... Plate-shaped support member 601,602 ... Damper 701,702 ... Through hole 703 ... Duct.

Claims (5)

It is a vibration damping housing that is installed on a mobile body and stores multiple electronic devices.
With an integrated base member,
The first housing fixed on the base member and
A second housing arranged on the base member via a low-rigidity support member is provided.
The first housing and the second housing are arranged adjacent to each other.
A damper that restricts the movement of the second housing is provided between the first housing and the second housing.
The damper restricts the movement of the second housing in a direction along the side surface of the second housing facing the side surface of the first housing.
The first housing is divided into a first division portion and a second division portion and fixed on the base member.
The second housing is arranged between the first division and the second division.
The damper is provided between the first division portion and the second housing, and between the second division portion and the second housing, respectively .
When the entire vibration damping housing is shaken, the vibration damping housing is displaced so that the second housing cancels the displacement of the first division portion and the second division portion. A vibration damping housing characterized in that the displacement of the entire body is suppressed, and the relative displacement between the first divided portion, the second divided portion, and the second housing is suppressed by the damper. The vibration damping housing according to claim 1.
The damper is a vibration damping housing characterized in that the movement of the second housing in a direction perpendicular to the side surface of the second housing facing the side surface of the first housing is restricted. .. The vibration damping housing according to claim 1 or 2.
The low-rigidity support member is a vibration-damping housing characterized by being a plate-shaped rubber elastic body having substantially the same area as the bottom surface of the second housing. The vibration damping housing according to any one of claims 1 to 3.
The low-rigidity support member is a vibration-damping housing characterized by being a laminated structure composed of a plurality of layers made of different materials. The vibration damping housing according to any one of claims 1 to 4.
It has a through hole that penetrates the first housing and the second housing.
A vibration damping housing characterized in that a duct is provided in the through hole.

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