JP2007069664A - Vibration isolating floating floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolating floating floor structure of a vehicle body capable of improving riding comfort and reducing in-vehicle noise. <P>SOLUTION: A seat floor plate 24 wherein a seat 16 is mounted is supported by a bush type vibration isolating device 26 and a hybrid type vibration isolating device 28 so as to float from a beam. In the seat floor plate 24, both side parts in a vehicular width direction (an arrow W direction) is supported by the bush type vibration isolating device 26 setting stiffness in horizontal direction to be high, and a center part in the vehicular width direction is supported by the hybrid type vibration isolating device 28 having high vertical damping force. Though vibrations from the beam intend to transfer to the seat floor plate 24, the bush type vibration isolating device and the hybrid type vibration isolating device 28 are interposed between the beam and the seat floor plate 24 to prevent the transmission of vibrations to the floor plate side, so that the seat floor plate 24 is hard to be vibrated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-vibration floating floor structure, and more particularly, to an anti-vibration floating floor structure suitable for a high-speed moving body such as a railway vehicle that runs at high speed.

A conventional floor structure in a railway vehicle is generally a structure in which a floor panel is directly fixed to a beam formed on a vehicle body or a rubber plate is sandwiched and fastened, and a seat or a carpet and a seat are arranged thereon.
By the way, with the recent technological advancement, the speed and weight of high-speed moving bodies have progressed, and chatter vibrations (for example, 10 Hz to 50 Hz) generated in the vehicle body have become apparent and riding comfort has become a problem. In addition, an increase in low-frequency noise has become apparent.

  In the prior art, the vibration generated from the bogie is prevented from being transmitted to the vehicle body via an air spring or anti-vibration rubber, but the floor panel is directly fastened to the beam formed on the vehicle body. Vibrations generated in the vehicle body itself (for example, device vibrations, aerodynamic vibrations, and vehicle body primary bending vibrations) are directly transmitted to the passengers via the floor panel.

Some conventional floor structures have rubber plates or anti-vibration rubber sandwiched between the beam and the floor panel, but these are for the purpose of soundproofing (for example, reducing vibration transmission in the audible band of about 1 kHz) However, it did not solve the riding comfort problem (for example, Patent Documents 1 and 2).
JP 2000-205334 A JP 2000-52981 A

  An object of the present invention is to provide an anti-vibration floating floor structure for a vehicle body that can reduce chatter vibration of 10 Hz or more and improve riding comfort in consideration of the above facts. In addition, it is possible to reduce vehicle interior noise due to the vibration-proofing and damping effect of the floating floor structure.

  The invention according to claim 1 is an anti-vibration floating floor structure including a floor plate disposed on a beam provided on a vehicle body and an anti-vibration device disposed between the beam and the floor plate. Thus, the first vibration isolator having a higher horizontal rigidity than the vertical direction and the second vibration isolator having a higher attenuation rate with respect to the vertical vibration than the first vibration isolator. It is characterized by having.

Next, the operation of the anti-vibration floating floor structure according to claim 1 will be described.
As a result of investigation by the inventors, it has been found that the deterioration of riding comfort due to chatter vibrations generated in the vehicle body can be significantly improved by preventing vibrations transmitted from the beams to the floor plate and damping the vibrations of the floor plate. .

Therefore, in the anti-vibration floating floor structure according to the first aspect, the floor plate is supported on the beam via the first anti-vibration device having a higher horizontal rigidity than the vertical direction, and the first anti-vibration structure is provided. By supporting the beam via a second vibration isolator that has a higher damping rate for vibration in the vertical direction than that of the vibration device, the vibration from the beam is prevented while securing the required horizontal rigidity. In addition, it is possible to increase the vibration damping force in the vertical direction, which can greatly improve riding comfort.
In addition, as an example, a floor board supports the both sides of a vehicle body width direction to a beam via a 1st vibration isolator, and supports the center side of a vehicle body width direction to the said beam via a 2nd vibration isolator. Can do.

  By arranging the first vibration isolator on both sides of the floor plate, the entire floor plate can be stably supported, and the center portion of the floor plate becomes the anti-vibration part of the vibration. By arranging, it becomes possible to reduce floor board vibration and improve riding comfort. This is because the vibration from the foot has a great influence on the riding comfort in terms of bodily sensation, and it is effective to reduce the vibration at the foot (position on the center side of the floorboard).

  In addition, when a floor board is supported by one type of vibration isolator as in the prior art, if a vibration isolator having low vertical rigidity is used to prevent and attenuate vibrations in the vertical direction of 10 Hz or more, There was a problem that the rigidity in the direction also decreased at the same time.

  According to a second aspect of the present invention, in the anti-vibration floating floor structure according to the first aspect, the vehicle body is provided with a plurality of seats in the vehicle front-rear direction. Two or more seats are arranged in the front-rear direction.

Next, the operation of the anti-vibration floating floor structure according to claim 2 will be described.
Since the floor board is supported by the first vibration isolator and the second vibration isolator which are elastic bodies, if the length in the longitudinal direction of the vehicle body is short, it becomes easy to pitch, and this pitching motion deteriorates riding comfort. To do. Therefore, in order to ensure riding comfort, the floorboard is preferably set to a length that allows two or more seats to be arranged in the longitudinal direction of the vehicle body. However, if the floor plate is made too long in the longitudinal direction of the vehicle body, there are fears that the carrying-in and mounting operations into the vehicle will be deteriorated, and the establishment of the loading conditions will be lowered. Note that a condition in which all passengers are seated on the seats on the floor board is defined as a vehicle loading condition, and this condition enables vibration isolation up to a low frequency region with the same floating floor configuration. Conversely, in the empty state, the vibration isolation region shifts to the high frequency side (because the mass decreases and the natural frequency increases). Moreover, when the passenger | crew is seated sparsely, it becomes a vibration proof area | region between empty conditions and loading conditions. For this reason, it is preferable to set the upper limit of the length in the longitudinal direction of the vehicle body per floorboard to a length that provides four seats in the longitudinal direction of the vehicle body.

  According to a third aspect of the present invention, in the anti-vibration floating floor structure according to the first or second aspect, the plurality of floor boards are arranged on the beam, and the floor boards are separated from each other. It is characterized by.

Next, the operation of the anti-vibration floating floor structure according to claim 3 will be described.
By separating the floor boards from each other, it is possible to eliminate the influence of the vibration of the floor boards on other floor boards. For example, by separating a floor board on which a seat is mounted and a floor board for a passage without a seat, vibrations when walking in the passage can be prevented from being transmitted to a passenger in the seat. Furthermore, since there may be various conditions such as a part where vibration is likely to occur in a vehicle, a part where it is difficult to place, a place where a heavy object is mounted, etc., the floor is constituted by a plurality of floor boards according to those conditions Therefore, an optimal anti-vibration floating floor structure can be realized.
In addition, it is preferable that the gap between floor boards is small so that sound from under the floor does not easily enter the vehicle interior. However, if the gap is too small, the sliding resistance of the seal member between the floor plates described later increases due to the relative displacement between the floor plates, and it is likely to be affected by vibration through the seal member, and the soft support rigidity above and below may be impaired. For this reason, it is necessary to set a gap amount suitable for the vehicle body situation in consideration of the floor plate detachment workability.

  According to a fourth aspect of the present invention, in the anti-vibration floating floor structure according to any one of the first to third aspects, at least one of the first anti-vibration device and the second anti-vibration device. Is characterized in that it is supported on or directly attached to the beam via a bracket arranged to connect the two beams.

Next, the operation of the anti-vibration floating floor structure according to claim 4 will be described.
First, when a bracket is arranged so as to connect two beams and at least one of the first vibration isolator and the second vibration isolator is attached to the bracket, the first position is set at a desired position of the vehicle body. The anti-vibration device and the second anti-vibration device can be arranged, and the size of the floor board and the degree of freedom of the arrangement position are increased, and the anti-vibration effect can be exhibited to the maximum. In addition, the rigidity of the beam can be improved by connecting the two beams with a bracket.

In conventional vehicles, the floor plate is directly fixed to the beam or fixed with a highly rigid rubber plate sandwiched between them, so the floor plate stiffness also contributed to the beam stiffness. As a result, vibration amplification is a concern, but the effect of alleviating it can be obtained by attaching the bracket. Furthermore, by lowering the bracket's vibration isolator mounting position from the top surface of the beam, the floor surface height can be lowered and the cabin space (height) can be increased compared to the case where the vibration isolator is mounted on the beam. Can do.
On the other hand, the first vibration isolator and the second vibration isolator are attached on the beam, and the floor board is attached on the first vibration isolator and the second vibration isolator. The weight can be reduced by not using brackets.

  According to a fifth aspect of the present invention, in the anti-vibration floating floor structure according to any one of the first to fourth aspects, an amount of vertical displacement of the floor board is set between the beam and the floor board. It is characterized by the provision of a limiting stopper.

Next, the operation of the anti-vibration floating floor structure according to claim 5 will be described.
For example, when a passenger is walking or the like, when the vertical movement of the floor board is large, the vertical displacement of the floor board can be suppressed by providing a stopper that limits the vertical displacement of the floor board. In addition, as an effect of a stopper, the up-and-down displacement sense of incongruity at the time of walking can be improved, and walking safety can be improved.

  According to a sixth aspect of the present invention, in the vibration-isolating floating floor structure according to any one of the first to fifth aspects, the first vibration isolator is one of the beam and the floor plate. An outer cylinder having an axial direction oriented vertically, an inner cylinder disposed inside the outer cylinder and connected to either the beam or the floor plate, the outer cylinder and the inner cylinder, And an elastic body that connects the two.

Next, the operation of the anti-vibration floating floor structure according to claim 6 will be described.
The first vibration isolator in which the inner cylinder is arranged on the inner side of the outer cylinder facing the vertical direction via the elastic body, the elastic body is compressed and stretched and deformed in the vertical direction against the displacement in the horizontal direction. On the other hand, the elastic body undergoes shear deformation. Thereby, it is possible to easily realize that the rigidity in the horizontal direction is high and the rigidity in the vertical direction is low.

  According to a seventh aspect of the present invention, in the anti-vibration floating floor structure according to any one of the first to sixth aspects, the end of the floor plate is adjacent to the other floor plate adjacent to the vehicle body or the side wall of the vehicle body. The sealing member which consists of an elastic body which plugs up the clearance gap between them is provided.

Next, the operation of the anti-vibration floating floor structure according to claim 7 will be described.
When the floor portion of the vehicle body is composed of a plurality of floor boards, a gap is provided between the floor boards so as not to transmit the vibrations of the floor boards to other floor boards. When such a gap is provided, noise from a driving device such as a motor disposed under the floor enters the vehicle interior via the gap.

Therefore, when the floorboards are separated from each other, the gaps are closed with a sealing member made of an elastic body having the necessary sound insulation performance, thereby preventing the vibration of the floorboards from being transmitted to other floorboards, and Noise that enters the room can be blocked. It is also possible to prevent dust, articles, etc. from falling through the gap under the floor.
Further, since the seal member is made of an elastic body and is provided with an appropriate crushing allowance in the initial mounting state, the seal member can follow even if the floor boards are relatively displaced.

  The invention according to claim 8 is an anti-vibration floating floor structure including a beam provided on a vehicle body and a floor plate disposed on the beam, and is disposed between the floor plate and the beam. A first vibration isolating member that is provided with a vibration isolating body made of an elastomer and is set between the floor plate and the beam, the first vibration isolating member having a higher horizontal rigidity than the vertical direction, and the first vibration isolating member. A metal-made second vibration isolating member having a lower vertical spring constant than that of the metal plate, and a damper that is disposed between the floor plate and the beam and damps vibration of the floor surface. It is characterized by.

Next, the operation of the anti-vibration floating floor structure according to claim 8 will be described.
In the anti-vibration floating floor structure according to claim 8, the floor plate includes a first anti-vibration member that is set to have higher rigidity in the horizontal direction than the up-down direction, and a spring constant in the upper-lower direction than that of the first anti-vibration member. Is supported by a metal-made second anti-vibration member set to be low and a damper that attenuates vibrations on the floor surface, thereby ensuring vibrations from the beam while ensuring the required horizontal rigidity. At the same time, the vibration damping force in the vertical direction can be increased, and the riding comfort can be greatly improved.

  As an example, the first vibration isolator can be placed on both sides of the floor plate to provide stable support for the entire floor plate. However, since the center portion of the floor plate becomes an anti-vibration portion, a damper for damping the vibration is disposed there. This makes it possible to reduce floor board vibration and improve riding comfort. This is because the vibration from the foot has a great influence on the riding comfort in terms of bodily sensation, and it is effective to reduce the vibration at the foot (position on the center side of the floorboard). Note that the arrangement position of the second vibration isolation member is arbitrary. The damper may be of any known structure as long as it can attenuate vibrations.

  As described above, according to the anti-vibration floating floor structure of the present invention, the ride comfort can be improved.

Hereinafter, an embodiment of the anti-vibration floating floor structure of the present invention will be described in detail with reference to the drawings. This embodiment is an example in which the anti-vibration floating floor structure of the present invention is applied to a railway vehicle.
As shown in FIG. 1 and FIG. 2, a plurality of seats 16 for two persons are provided on the floor 12 of the vehicle body 10 of the vehicle on the left and right sides of the vehicle across the central passage 14 in the vehicle front-rear direction. .

As shown in FIGS. 2 and 3, a plurality of beams 18 extending in the vehicle body width direction are provided at intervals in the vehicle front-rear direction at the inner lower portion of the vehicle body 10.
As shown in FIG. 3, these beams 18 are provided with sheet metal brackets 20 so as to connect the beams 18 adjacent to each other in the vehicle longitudinal direction.

  As shown in FIGS. 3 and 4, the bracket 20 includes a pair of upper portions 20 </ b> A that extend in the longitudinal direction of the vehicle and are mounted on the upper surface of the beam 18 and fixed by screws 22. A vertical portion 20B that extends integrally downward from one side of 20A facing each other, and a vibration isolator mounting portion 20C that integrally connects the lower end of one vertical portion 20B and the lower end of the other vertical portion 20B. I have. Accordingly, the vibration isolator mounting portion 20 </ b> C is positioned below the upper surface of the beam 18.

As shown in FIG. 5, the floor 12 includes a passage floor plate 22 provided in a central passage portion, and a seat floor plate 24 provided on both sides of the passage floor plate 22 in the vehicle width direction and to which a seat 16 is attached. Has been.
As shown in FIG. 6, the seat floor plate 24 of the present embodiment is formed in such a length that the seats 16 are attached in four rows in the vehicle front-rear direction.

  As shown in FIG. 3, a bush type vibration isolator 26 or a hybrid type vibration isolator 28, which will be described later, is attached to the bracket 20 described above, and the seat floor 24 includes a plurality of bush type vibration isolator 26, And a plurality of hybrid vibration isolator 28.

In the present embodiment, although not shown in the drawings, the passage floor plate 22 is supported only by the plurality of hybrid type vibration damping devices 28.
The bracket 20 has a relief hole 21 formed in the center of a portion to which the bush type vibration isolator 26 or the hybrid type vibration isolator 28 is attached. This has the role of not impairing the damping function of the orifice 52 of the hybrid vibration isolator 28 described later.

(Bush type vibration isolator)
As shown in FIG. 7, the bush type vibration isolator 26 includes an outer cylinder 30 whose axial direction is in the vertical direction, a shaft 32 that is coaxially disposed inside the outer cylinder 30, and the outer cylinder 30 and the shaft 32. And a rubber-like elastic member 34 for connecting the two. Thereby, the bush type vibration isolator 26 of the present embodiment is set to have higher rigidity in the horizontal direction (direction perpendicular to the axial direction of the shaft 32) than in the vertical direction (axial direction of the shaft 32). .

The bush type vibration isolator 26 is fixed to the holder 34 by pressing the outer cylinder portion into the hole 36 of the holder 34. The holder 34 is fixed to the vibration isolator mounting portion 20C of the bracket 20 with a bolt (not shown).
A mounting plate 38 is horizontally fixed to the upper end of the shaft 32 with screws 40, and the seat floor plate 24 or the passage floor plate 22 is attached to the mounting plate 38.

(Hybrid vibration isolator)
As shown in FIG. 8, the hybrid vibration isolator 28 is provided with a hollow cylindrical rubber-like elastic member 46 between a first plate 42 attached to the bracket 20 and a second plate 44 attached to the seat floor plate 24. A support spring 48 is provided between the first and second plates 42 and 44 in the hollow interior 46 </ b> A of the rubber-like elastic member 46. An intermediate restraining member 50 is provided at an axially intermediate position on the cylindrical outer surface side of the rubber-like elastic member 46 so that the outer diameter dimension of the corresponding part does not increase.

  The rubber-like elastic member 46 is made of natural rubber, synthetic rubber or the like and has an internal damping effect against vibration. The rubber-like elastic member 46 is formed with a flange-like portion 46B projecting radially outward at an intermediate portion, and the intermediate restraining member 50 is partially embedded in the flange-like portion 46B. Constricted portions 46C and 46D constricted on the center side are formed above and below the hook-shaped portion 46B.

  The support spring 48 is a metal coil spring that is less likely to be damaged than an elastomer such as rubber, and supports the load and has an anti-vibration function so as not to transmit the vibration of the beam 18 to the floor plate side. It is what you are doing. The support spring 48 is mounted between a protruding portion 42 </ b> A formed on the first plate 42 and a dish portion 44 </ b> A formed on the second plate 44.

  An orifice 52 is formed at the center of the projecting portion 42A of the first plate 42, and air communication between the hollow interior 46A and the outside is achieved. When the first plate 42 and the second plate 44 move relative to each other in the vertical direction, air travels inside and outside the rubber-like elastic member 46 through the orifice 52 and exhibits a large damping force. In other words, the hybrid vibration isolator 28 has a damper function in the vibration system. That is, this hybrid type vibration isolator 28 is provided with a spring and a damper in parallel in a vibration system.

  In the hybrid type vibration isolator 28, the intermediate restraining member 50 is used. However, in the case where the intermediate restraining member 50 is not used, when the entire rubber-like elastic member 46 is formed of rubber, When the internal air is discharged by compression, escape deformation occurs in the direction in which the outer diameter of the intermediate portion increases. When such escape deformation occurs, the amount of air passing through the orifice 52 decreases, and sufficient attenuation with respect to the design value cannot be obtained. On the other hand, when the intermediate restraint member 50 is provided as in the present embodiment, it is possible to prevent the outer diameter of the intermediate portion from expanding. Therefore, in this embodiment, the deformation of the rubber-like elastic member 46 is not an enlargement of the outer diameter, but can be effectively deformed to obtain an air damping effect.

(Support structure for floorboard for seat)
As shown in FIG. 6, the seat floor plate 24 of the present embodiment is supported by a plurality of bush type vibration isolators 26 on both sides of the vehicle width direction (arrow W direction) and in the vicinity of the seat 16. A central portion in the vehicle width direction is supported by a plurality of hybrid type vibration damping devices 28. The hybrid vibration isolator 28 at the center portion in the vehicle width direction need not be limited to one row, and the arrangement of the hybrid vibration isolator 28 is determined according to the vibration state of the vehicle body 10 and the like.

  More specifically, two bush type vibration damping devices 26 are arranged in the front-rear direction on both sides of the seat 16 in a plan view of the floor surface, and two hybrid type vibration damping devices are disposed in the center portion in the width direction of the seat 16. A device 28 is arranged. In the seat floor plate 24, the hybrid vibration isolator 28 is disposed on both sides in the width direction in the front portion of the front row of seats 16 located on the vehicle front side (arrow A direction side).

(Support structure for passage floor)
Although not shown in the drawings, the passage floor plate 22 supports both side portions in the vehicle width direction by a plurality of bush-type vibration isolators 26 as in the case of the floor plate 24 for seats, and a plurality of hybrid vibration-proof devices at the center portion in the vehicle width direction. It may be supported by 28, or may be supported only by a plurality of hybrid type vibration isolators 28 or a plurality of bush type vibration isolators 26.

  In this embodiment, as shown in FIG. 9, for example, as shown in FIG. 9, the end portion of the passage floor plate 22 and the end portion of the seat floor plate 24 are separated by about 10 mm (not shown, but the passage floor plate 22 The same applies to the floor plate 22 for the passage, the floor plate 24 for the seat, and the floor plate 24 for the seat.), For example, a seal member 54 having a cross-sectional shape as shown in FIGS. It has been.

  Each of the seal members 54 is formed of an elastic body such as an elastomer and is provided so as to close a gap between floor boards. 9 to 11, the seal member 54 has the left side of the drawing bonded to the end of the floor board on the left side of the drawing, and the right end of the drawing is given an appropriate crushing margin to the end of the floor plate on the right side of the drawing. Although the contact is made in the state, the seal member 54 is bonded to the floor plate end on the right side of the drawing with the direction of the seal member 54 opposite to that in FIGS. 9 to 11, and an appropriate crushing margin is applied to the floor plate end on the left side of the drawing. The sealing member 54 may be brought into contact with each other, and high sealing performance is maintained even when the bonding partner of the sealing member 54 changes. Further, the configuration for closing the gap between the floor plates is not limited to that described above. For example, as shown in FIG. 17, a strip-shaped seal member 54 that connects the floor plates is disposed on the back side of the floor plate, 54 may be attached to the rear surface of the floor plate by slackening or screwing. Further, when closing the gap between the end of the floor plate and the side wall of the vehicle body, the sealing member 54 may be bonded to one of them, as in the case of closing the gap between the floor plates, although not shown.

  Specific examples of the cross-sectional shape of the seal member 54 include, for example, three peaks as shown in FIG. 9, a peak as shown in FIG. 10, and a comb shape as shown in FIG. Other shapes may be used.

(Function)
Next, the operation of the anti-vibration floating floor structure of the present embodiment will be described.
For example, when the vehicle travels at a high speed, vibration is generated in the vehicle body itself, and this vibration is also transmitted to the beam 18. This vibration tries to be transmitted from the beam 18 to the seat floor 24, but the bush type vibration isolator 26 and the hybrid type vibration isolator 28 are interposed between the beam 18 and the seat floor 24 to the floor plate side. Therefore, the seat floor plate 24 is less likely to vibrate while ensuring the necessary rigidity in the horizontal direction.

  Here, the chatter vibration that the occupant feels uncomfortable is the superposition of the vibration of the seat floor plate 24 and the vibration accompanying the deformation that bends the seat floor plate 24 in the width direction, and the seat becomes the antinode of vibration. Hybrid type anti-vibration in which the damping force in the vertical direction is set high at the central portion in the width direction of the floor plate 24 for the seat, although it is greatest at the central portion in the width direction of the plate member 24 (note that the vibration nodes are at both ends in the width direction). Since the device 28 is connected, the chatter vibration can be effectively damped and the riding comfort is improved.

  The anti-vibration floating floor structure of the present embodiment is compared with the conventional floor structure supported by a single anti-vibration device, for example, not only vibration (chatter vibration) felt by the body of 10 to 50 Hz but also about 60 to 300 Hz. Low-frequency noise can be significantly reduced, and is suitable for, for example, a high-speed railway vehicle that travels at 300 km / h or more. The conventional floor structure referred to here is, for example, a vibration isolator 106 sandwiching a rubber 100 as shown in FIG. 13 between a pair of plates 102 and 104, as shown in FIG. It is a thing of composition.

Since each seat floor plate 24 and passage floor plate 22 have different load loading conditions and the like, their movements are usually inconsistent. However, in this embodiment, the floor plates are separated from each other. There is no possibility that the vibration of the floor board affects the other floor board.
In addition, since the sealing member 54 is interposed at the end of the floor plate, no gap is generated even if the floor plates are relatively displaced to each other, so that sound from under the floor can be prevented from entering the cabin, and dust can be prevented. And the article can be prevented from falling below the floor.

Of course, the spring constants (vertical direction, horizontal direction), damping force, etc. of the bush type vibration isolator 26 and the hybrid type vibration isolator 28 are optimally set according to the conditions of each floor board. is there.
The anti-vibration floating floor structure of the present invention is not limited to a railway vehicle, and can be applied to a high-speed moving body such as a bus or an aircraft.

[Other Embodiments]
Since the passage floor plate 22 and the seat floor plate 24 are supported by elastic bodies (vibration isolation devices), they may move up and down due to load fluctuations (for example, walking of passengers, etc.). Therefore, when it is desired to limit the amount of displacement of such vertical movement, as shown in FIG. 4, between the beam 18 and the passage floor plate 22 (or between the beam 18 and the seat floor plate 24), A block-shaped stopper 56 that restricts the amount of vertical movement displacement may be disposed. The stopper 56 is preferably formed of an elastic body such as an elastomer. A stopper that limits the amount of vertical movement displacement may be provided on the bush type vibration isolator 26 or the hybrid type vibration isolator 28.

In the above embodiment, four seats 16 are attached to the front and rear seats 24 for one seat floor plate 24. However, the number of seats 16 attached to one seat floor plate 24 is not limited to four. . However, if the front and back length of the seat floor plate 24 is too short, the seat floor plate 24 tends to cause pitching (giving passengers discomfort). Therefore, the minimum front and rear length of the seat floor plate 24 is shown in FIG. In addition, it is preferable to have a length that accommodates two front and rear seats. Further, in order to make it difficult for pitching to occur, it is preferable that the longitudinal length of the seat floor plate 24 is long. However, if it is too long, it is difficult to carry in the vehicle during manufacture or it becomes difficult to attach and detach, as shown in FIG. Although it is preferable to keep the length to accommodate the front and rear four seats, it may be determined according to the situation of the vehicle body 10.
In the above-described embodiment, the hybrid type vibration isolator 28 and the plurality of bush type vibration isolators 26 are attached to the brackets 20 spanned on the beam 18, but in some cases, directly on the beam 18. You may attach (for example, refer FIG. 15 (In addition, illustration of the bush type vibration isolator 26 is abbreviate | omitted in FIG. 15)). In this method, the weight can be reduced and the cost can be reduced because the bracket 20 is not used, but the floor height is increased by the amount of the vibration isolator, and the cabin space is narrowed. Accordingly, whether or not the bracket 20 is used may be appropriately selected depending on the purpose.
Moreover, in the said embodiment, although the floor 12 in a passenger room was comprised with the passage floor board 22 provided in a channel | path part, and the seat floor boards 24 provided in the vehicle width direction both sides, for example, for one sheet | seat The floor 12 may be constituted by a plurality of floor boards 58 instead of the floor board 22 and the two seat floor boards 24 on both sides thereof as shown in FIG.

  In the above embodiment, the hybrid vibration isolator 28 having a configuration in which a spring and a damper referred to in the vibration system are provided in parallel is used. However, the present invention is not limited to this, and the spring and the damper referred to in the vibration system are used. May be provided separately. For example, a configuration in which the support spring 48 is removed from the hybrid vibration isolator 28 may be used as a damper, and the support spring 48 may be disposed in another part.

It is a top view which shows the inside of a vehicle. It is a width direction sectional view of vehicles. It is a perspective view which shows the vehicle lower part which removed the floor board. It is sectional drawing of a vibration-proof floor. It is a top view of the floor which shows arrangement | positioning of a floor board. It is a top view of the floor board which shows the positional relationship of a vibration isolator, a floor board, and a seat. It is sectional drawing of a bush type vibration isolator. It is sectional drawing of a hybrid type vibration isolator. It is sectional drawing of a sealing member. It is sectional drawing of the sealing member which concerns on other embodiment. It is sectional drawing of the sealing member which concerns on other embodiment. It is a top view of the floor board which concerns on other embodiment which shows the positional relationship of a vibration isolator, a floor board, and a seat. It is sectional drawing of the conventional vibration isolator. It is a top view of the vibration isolator floor using the conventional vibration isolator. It is sectional drawing of the vibration-proof floor which concerns on other embodiment. It is a top view of the floor which shows arrangement | positioning of the floor board which concerns on other embodiment. It is sectional drawing of the sealing member which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car body 12 Floor 18 Beam 20 Bracket 22 Passage floor board 24 Seat floor board 26 Bush type vibration isolator (first vibration isolator)
28 Hybrid vibration isolator (second vibration isolator)
30 outer cylinder 32 shaft 34 rubber-like elastic member 54 seal member 58 floor board

Claims (8)

A vibration-isolating floating floor structure comprising a floor plate disposed on a beam provided on a vehicle body, and a vibration isolation device disposed between the beam and the floor plate,
A first anti-vibration device that is set to have a higher rigidity in the horizontal direction than the up-down direction; An anti-vibration floating floor structure characterized by comprising The said vehicle body is provided with several seats in the vehicle front-back direction, The said floor board provided with the said seat has arrange | positioned two or more seats in the vehicle body front-back direction. Anti-vibration floating floor structure. The anti-vibration floating floor structure according to claim 1 or 2, wherein a plurality of floor boards are arranged on the beam, and the floor boards are separated from each other. At least one of the first anti-vibration device and the second anti-vibration device is supported by the beam via a bracket arranged to connect the two beams, or directly on the beam. The anti-vibration floating floor structure according to any one of claims 1 to 3, wherein the anti-vibration floating floor structure is attached. The anti-vibration floating floor according to any one of claims 1 to 4, wherein a stopper is provided between the beam and the floor board to limit a vertical displacement amount of the floor board. Construction. The first vibration isolator is connected to one side of the beam or the floor plate, and has an outer cylinder with the axial direction oriented in a vertical direction, and is disposed inside the outer cylinder, either the beam or the floor plate. The vibration isolator according to any one of claims 1 to 5, further comprising: an inner cylinder connected to the other side; and an elastic body connecting the outer cylinder and the inner cylinder. Floating floor structure. The sealing member which consists of an elastic body which block | closes the clearance gap between the said other adjacent floor board or the side wall of a vehicle body is provided in the edge part of the said floor board, The Claims 1 thru | or 6 characterized by the above-mentioned. The anti-vibration floating floor structure described in any one of the items. An anti-vibration floating floor structure comprising a beam provided on a vehicle body and a floor plate disposed on the beam,
A first anti-vibration member disposed between the floor plate and the beam, provided with an anti-vibration body made of an elastomer, and set to have higher rigidity in the horizontal direction than in the vertical direction;
A metal second vibration isolating member disposed between the floor plate and the beam and having a lower vertical spring constant than the first vibration isolating member;
A damper disposed between the floor plate and the beam and dampening vibration of the floor surface;
An anti-vibration floating floor structure characterized by comprising:

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