JP2008018921A - Vibration-proof floating floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-proof floating floor structure with improved riding comfort suitable to a high-speed moving body such as rolling stock for high speed traveling. <P>SOLUTION: A floor plate 24 for seats having seats 16 on it are supported by a vibration-proof device 26 to float from a beam. Vibration from the beam is transmitted to the floor plate 24 for seats, while a metal spring 46 of the vibration-proof device 26 is provided between the beam and the floor plate 24 for seats to prohibit transmission of vibration to the floor plate, so that the floor plate 24 for seats is less likely vibrated. As the floor plate 24 for seats is vibrated, a shaft member 32 and an outer cylinder 30 in the vibration-proof device 26 are relatively displaced in the axial direction, and a slide member 42 slides to an outer circumferential surface of the shaft member 32 to generate damping force. In addition, air in a main fluid chamber 44 formed inside the shaft member 32 and the outer cylinder 30 passes through a gap between the slide member 42 and the shaft member 32 to generate damping force, thus effectively damping vibration of the floor plate 24 for seats, and improving ride comfort. <P>COPYRIGHT: (C)2008,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

In order to suppress the chatter vibration, it is necessary to set the natural frequency of the vibration isolator to be lower than the vibration frequency of the chatter vibration (for example, less than 10 Hz).
Considering conventional anti-vibration rubber, the natural frequency is a low frequency, which may cause the following problems.
(1) Deflection and settling due to static load increase.
(2) Sufficient horizontal (front and rear, left and right) rigidity cannot be obtained.
(3) Sufficient damping cannot be obtained (vibration does not calm down, and vibration in the resonance region increases.

  In consideration of the above facts, the present invention provides a vibration-isolating floating floor structure for a vehicle body that can improve the riding comfort while suppressing the increase in vibration in the resonance region while reducing chatter vibration while solving the above problems. Is the purpose.

  The invention according to claim 1 is an anti-vibration floating floor structure comprising 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. The vibration isolator is connected to one of the floor plate and the beam, and is connected to the shaft member whose axis is in the vertical direction, and is connected to the other one of the floor plate and the beam, and the shaft member is disposed inside. A housing member having a hole for housing, one of which is connected to the floor plate side and the other is connected to the beam side to support the load of the floor plate, the outer diameter portion of the shaft member, and the inside of the hole of the housing member It is arranged between the peripheral surface and restricts the relative displacement in the radial direction, and when the shaft member and the housing member are relatively displaced in the axial direction, the inner diameter of the shaft member and the inside of the hole of the housing member And a sliding member that is fixed to one of the peripheral surfaces and slides on the other to generate a damping force. , It is characterized in that.

Next, the operation of the anti-vibration floating floor structure according to claim 1 will be described.
The deterioration of riding comfort due to chatter vibrations generated in the vehicle body is greatly determined by the investigation by the inventor, by suppressing the vibration transmitted from the beam to the floor with an elastic body and damping the vibration of the floor with a damper. It turns out that it can be improved.

Therefore, in the vibration-isolating floating floor structure according to the first aspect, the vibration transmitted from the beam to the floor board can be prevented by a metal spring provided in the vibration isolator. Further, when vibration occurs in the floor plate, the shaft member and the housing member are relatively displaced in the axial direction, so that the sliding fixed to one of the outer diameter portion of the shaft member and the inner peripheral surface of the housing member Since the member slides on the other side to generate a damping force, the vibration is immediately controlled. In this vibration isolator, the sliding member slides on at least one of the outer diameter portion of the shaft member and the inner peripheral surface of the hole of the housing member, and thus has the following advantages.
(1) Since the load is received by the metal spring, there is almost no change over time (sagging), and a large stroke can be accommodated.
(2) Since the sliding member is disposed between the outer diameter portion of the shaft member and the inner peripheral surface of the hole of the housing member, the radial displacement between the shaft member and the housing member, that is, the horizontal displacement is small. The required rigidity in the horizontal direction can be secured. And sufficient horizontal rigidity can be obtained only with the vibration isolator without using other means.
(3) By appropriately setting the fitting size of the sliding member, it is possible to obtain an appropriate damping property while suppressing the influence on the support spring (spring in the vibration system) characteristics of the vibration isolator. it can.

  Thus, according to the anti-vibration floating floor structure according to claim 1, it is possible to prevent vibration from the beam and to increase the vibration damping force in the vertical direction while ensuring the necessary rigidity in the horizontal direction. This can greatly improve riding comfort. Further, vibration amplification near the natural frequency can be suppressed without lowering the static spring characteristics.

  In addition, the stable support of the whole floor board can be aimed at by arrange | positioning the vibration isolator on both floor boards. Moreover, since the center part of the floor board becomes an anti-vibration part, when installing a seat in the center part of the floor board, it is preferable to arrange a vibration isolator there. 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).

  According to a second aspect of the present invention, in the anti-vibration floating floor structure according to the first aspect, the opening of the hole of the housing member is closed by the shaft member and the sliding member, so that the mainstream is inside the housing member. A body chamber, and the main fluid chamber is formed between a gap formed between the sliding member and an outer diameter portion of the shaft member, and between the sliding member and an inner peripheral surface of the hole of the housing member. The main fluid is communicated with the outside through at least one of a gap formed in the shaft member, a hole formed in the shaft member, and a hole formed in the housing member, and relative displacement between the shaft member and the housing member. When a chamber volume change occurs, a fluid is caused to flow back and forth between the main fluid chamber and the outside via at least one of the gap and the hole to generate a damping force.

Next, the operation of the anti-vibration floating floor structure according to claim 2 will be described.
In the anti-vibration floating floor structure according to claim 2, when the floor plate moves up and down due to vibration and the shaft member and the housing member are relatively displaced in the axial direction, a volume change occurs in the main fluid chamber, and the sliding member and the shaft member A gap formed between the outer diameter portion, a gap formed between the sliding member and the inner peripheral surface of the hole of the housing member, a hole formed in the shaft member, and a hole formed in the housing member Fluid flows back and forth between the main fluid chamber and the outside through at least one of them, and generates a damping force.

  In the anti-vibration floating floor structure according to claim 2, the damping force generated when the sliding member slides on the outer diameter portion of the shaft member or the inner peripheral surface of the hole of the accommodating member, and the fluid The damping effect is enhanced by two damping forces, that is, a damping force generated by going back and forth with the outside.

  According to a third aspect of the present invention, in the vibration-proof floating floor structure according to the first aspect, the fluid is air.

Next, the operation of the anti-vibration floating floor structure according to claim 3 will be described.
In the anti-vibration floating floor structure according to claim 3, the gap is formed between the sliding member and the outer diameter portion of the shaft member, and is formed between the sliding member and the inner peripheral surface of the hole of the housing member. Air travels between the main fluid chamber and the outside through at least one of the gaps to generate a damping force.

  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, the main fluid chamber is arranged on the radially inner side fluid chamber of the shaft member, and A partition member made of an elastic material that is arranged radially outside the inner fluid chamber and divides into two outer fluid chambers that communicate with the atmosphere through the gap; a sub-fluid chamber independent of the main fluid chamber; and the inner fluid chamber A liquid sealed between the fluid chamber and the sub-fluid chamber, a diaphragm constituting a part of a partition wall of the sub-fluid chamber so that the sub-fluid chamber can be expanded and contracted, the inner fluid chamber, and the sub-fluid The fluid chamber communicates, and when the volume change of the inner fluid chamber occurs due to relative displacement between the housing member and the shaft member, the liquid is caused to flow back and forth between the inner fluid chamber and the sub fluid chamber. And an orifice that generates a damping force. There.

Next, the operation of the anti-vibration floating floor structure according to claim 4 will be described.
In the anti-vibration floating floor structure according to claim 4, when the floor plate moves up and down due to vibration and the shaft member and the housing member are relatively displaced in the axial direction, a volume change occurs in both the outer fluid chamber and the inner fluid chamber. .
When a volume change occurs in the outer fluid chamber, a gap formed between the sliding member and the outer diameter portion of the shaft member, and a gap formed between the sliding member and the inner peripheral surface of the hole of the housing member The fluid moves back and forth between the outer fluid chamber and the outside of the outer fluid chamber via at least one of the two, and generates a damping force.

Further, when a volume change occurs in the inner fluid chamber, the liquid moves back and forth between the inner fluid chamber and the sub-fluid chamber via the orifice to generate a damping force. Since the liquid is an incompressible fluid, when the liquid moves between the inner fluid chamber and the sub fluid chamber via the orifice, the diaphragm is deformed to allow a change in the volume of the sub fluid chamber.
Thus, in the vibration-isolating floating floor structure according to the fourth aspect, the damping force by the liquid is further applied, so that the vibration damping action can be further enhanced.

  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, the plurality of floor boards are arranged on the beam, It is characterized by being spaced apart from each other.

Next, the operation of the anti-vibration floating floor structure according to claim 5 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 floor plates described later increases due to the relative displacement between the floor plates, and it is easy to be affected by vibration from the adjacent floor plate through the seal member, and the soft support spring characteristics of the upper and lower sides Since there is a possibility of damage, it is necessary to set a gap amount suitable for the vehicle body condition in consideration of workability for removing and attaching the floor plate.

  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 vibration-proof device is a bracket arranged to connect the two beams. It is characterized by being supported by the beam through or directly attached on the beam.

Next, the operation of the anti-vibration floating floor structure according to claim 6 will be described.
First, if the bracket is arranged so as to connect the two beams, and the vibration isolator is attached to the bracket, the vibration isolator can be arranged at a desired position of the vehicle body, and the size of the floorboard and the degree of freedom of the arrangement position are increased. The vibration-proof effect can be maximized. 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. Although there is a concern about vibration amplification with the decrease, the effect of mitigating 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, if it is set as the structure which attaches an anti-vibration apparatus on a beam and attaches a floor board on the anti-vibration apparatus, it can reduce in weight not using a bracket.

  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 adjacent floor boards. When such a gap is provided, noise from a driving device such as a motor arranged under the floor enters the vehicle interior via the gap.

Therefore, when the floorboards are separated from each other, the gap between the floorboards is 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 adjacent floorboards. Noise from entering the passenger compartment 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.

  As described above, according to the anti-vibration floating floor structure of the present invention, it is possible to obtain the settling resistance, the sufficient rigidity in the horizontal direction, and the sufficient damping property, and the riding comfort can be greatly improved. It has an excellent effect. In addition, it is possible to reduce vehicle interior noise due to the vibration proofing / damping effect of the vibration proof floating floor structure.

[First Embodiment]
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 FIGS. 1 and 2, on the floor 12 of the vehicle body 10, two-seat seats 16 are arranged in the vehicle front-rear direction (arrow A direction) on the left and right sides of the vehicle with the central passage 14 interposed therebetween. A plurality are provided.
As shown in FIG. 2, a plurality of beams 18 extending in the vehicle body width direction are provided at the inner lower portion of the vehicle body 10 at intervals in the vehicle front-rear direction (the front and back sides in FIG. 2).

  As shown in FIGS. 2 and 3, the floor 12 includes a passage floor plate 22 provided in a central passage portion and a seat floor plate provided on both sides of the passage floor plate 22 in the vehicle width direction and to which a seat 16 is attached. Each floor board is attached on the beam 18 via a plurality of vibration isolators 26.

  In the present embodiment, as shown in FIG. 4, for example, as shown in FIG. 4, 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 passage floor plate 22 and between the seat floor plate 24 and the seat floor plate 24). For example, the cross-sectional shape shown in FIGS. The sealing member 54 which has is attached.

  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. 4 to 6, the seal member 54 has the left side of the drawing bonded to the end of the floor plate on the left side of the drawing, and the right end of the right side 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. 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 the above-described one. For example, as shown in FIG. 7, a belt-like seal member 54 that connects the floor plates is disposed on the back side of the floor plate, 54 may be loosened and attached to the back surface of the floor board by adhesion, screwing, or the like. 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. 4, a peak as shown in FIG. 5, and a comb-teeth shape as shown in FIG. Other shapes may be used.

As shown in FIG. 8, the vibration isolator 26 according to the present embodiment includes a metal outer cylinder 30 whose axial direction is vertical, and a metal shaft member that is coaxially disposed inside the outer cylinder 30. 32 is connected to the passage floor plate 22 or the seat floor plate 24 via the upper mounting plate 48.
The shaft member 32 has a bottom plate 32A integrally provided at the top thereof and has a cup shape.

The outer cylinder 30 has an inner flange 30A extending radially inward integrally at the upper end and an outer flange 30B extending radially outward integrally formed at the lower end.
The lower mounting plate 34 is adhered and fixed to the lower surface of the outer flange 30B.
The lower mounting plate 34 is mounted on the upper surface of the beam 18 and is fixed to the beam 18 with bolts 36 and nuts 37.

A sliding member holding member 38 made of an annular elastic body (rubber in this embodiment) is fixed to the inner peripheral surface of the outer cylinder 30. These serve as accommodating members via the lower mounting plate 34. The housing member is connected to the beam 18.
An annular groove 40 is formed on the inner peripheral surface of the sliding member holding member 38, and an annular sliding member 42 is fitted in the groove 40. The sliding member 42 slides on the outer peripheral surface of the shaft member 32 when the shaft member 32 and the outer cylinder 30 are relatively displaced in the axial direction. The inner diameter of the sliding member 42 is slightly larger than the outer diameter of the shaft member 32 so as to create a gap that allows air to enter and exit between the shaft member 32 and the sliding member 42. Further, the damping force can be adjusted by this fitting.

  Although the material of the sliding member 42 of this embodiment is a fluororesin, other synthetic resins such as PEEK resin and polyacetal resin may be used. If the wear resistance is excellent, a material other than the above synthetic resin is used. May be.

  In the vibration isolator 26, an internal space surrounded by the shaft member 32, the outer cylinder 30, the lower mounting plate 34, the sliding member holding member 38, and the sliding member 42 serves as a main fluid chamber 44. The air 44 can enter and leave the atmosphere through a gap between the shaft member 32 and the sliding member 42.

A metal spring 46 is disposed coaxially with the shaft member 32 inside the shaft member 32. The upper end of the metal spring 46 is in contact with the bottom plate 32 </ b> A of the shaft member 32, and the lower end is in contact with the lower mounting plate 34.
An upper mounting plate 48 is disposed on the upper side of the shaft member 32, and the upper mounting plate 48 is mounted on the bottom plate 32 </ b> A of the shaft member 32 by a countersunk bolt 50 and a nut 52.

The passage floor plate 22 and the seat floor plate 24 are mounted on the upper mounting plate 48 and fixed to the upper mounting plate 48 with bolts 78 and nuts 80.
The metal spring 46 is set to have a spring constant so as to prevent vibration transmission from the beam 18 to the floor side while supporting the floor plate load.
Further, the lower end of the shaft member 32 is separated from the lower mounting plate 34 so that the shaft member 32 moves in the vertical direction.

(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 plate 24 or the passage floor plate 22, but a vibration isolator 26 is interposed between the beam 18 and the seat floor plate 24 or the passage floor plate 22, thereby preventing the vibration. Since the metal spring 46 of the vibration device 26 acts to prevent transmission of vibration to the floor plate side, the seat floor plate 24 or the passage floor plate 22 is less likely to vibrate.

Since the sliding member 42 and the sliding member holding member 38 are interposed between the shaft member 32 and the outer cylinder 30, the position of the shaft member 32 is coaxially held with respect to the outer cylinder 30, Further, the radial rigidity of the shaft member 32 and the outer cylinder 30, that is, the horizontal rigidity is kept high.
That is, in this vibration isolator 26, the horizontal rigidity is set relatively higher than the vertical rigidity in order to ensure the necessary horizontal rigidity while preventing the vibration transmission. .

  When the seat floor plate 24 or the passage floor plate 22 vibrates, the shaft member 32 and the outer cylinder 30 are relatively displaced in the axial direction, so that the sliding member 42 slides on the outer peripheral surface of the shaft member 32. Therefore, damping force can be generated, and vibration can be effectively controlled as compared with support by an air spring or support by a vibration isolating rubber.

  Further, in the present embodiment, the load of the seat floor plate 24 or the passage floor plate 22 is supported by the metal spring 46, so that the conventional anti-vibration rubber with a static load acting causes a problem (change over time). Does not occur.

  Therefore, according to the anti-vibration floating floor structure of the present embodiment, vibrations transmitted from the beam 18 to the seat floor plate 24 or the passage floor plate 22 from the beam 18 are prevented while securing necessary horizontal rigidity. The vibration damping force in the direction can be increased, and the riding comfort can be greatly improved. In addition, vehicle interior noise from under the floor is also reduced by the anti-vibration and damping effect of the anti-vibration floating floor structure.

The vibration isolator of this structure has the following merits as compared with the conventional rubber support structure.
(1) Since the vibration is suppressed by the metal spring 46, there is almost no change over time (sagging), and a large stroke can be handled.
(2) Since the sliding member 42 held by the sliding member holding member 38 is disposed between the outer diameter portion of the shaft member 32 and the inner peripheral surface of the outer cylinder 30, the shaft member 32 and the outer The relative displacement in the radial direction with respect to the cylinder 30, that is, in the horizontal direction is limited, and sufficient necessary rigidity in the horizontal direction can be secured only by the vibration isolator 26.
(3) By appropriately setting the fitting dimension of the sliding member 42, an appropriate damping property can be obtained while suppressing the influence on the characteristics of the support spring (vibrating system) of the vibration isolator 26. be able to.

  Further, the vibration isolator 26 has a metal spring 46 disposed inside the shaft member 32 and has both functions of a spring and a damper in terms of a vibration system. Compared with the case where they are arranged as separate devices, the installation space is not required, the weight can be reduced, the mounting can be simplified, and the cost can be reduced.

  Here, the chatter vibration that the occupant feels uncomfortable is the superposition of the overall vibration of the seat floor plate 24 and the bending vibration of the seat floor plate 24 itself, and the center in the width direction of the seat floor plate 24 that becomes the antinode of vibration. (It is to be noted that since the end of the floor plate is supported in order to stably support the floor plate, the vibration nodes are at both ends in the width direction.) For this reason, by connecting the vibration isolator 26 that generates a damping force to the central portion in the width direction of the floor plate 24 for the seat, the chatter vibration can be effectively attenuated and the riding comfort can be improved. .

  Since the seat floor plate 24 and the passage floor plate 22 have different load loading conditions and the like, their movements are usually not the same. However, in this embodiment, the floor plates are separated from each other. There is no risk of vibration affecting the other adjacent floorboard.

  Moreover, in this embodiment, since the sealing member 54 is interposed at the end of the floor board, no gap is generated even if the floor boards are relatively displaced, and sound from under the floor is prevented from entering the cabin. It is also possible to prevent dust and articles from falling below the floor.

Needless to say, the spring constant and damping force of the metal spring 46 of the vibration isolator 26 are optimally set according to the conditions of each floor board.
Further, the anti-vibration floating floor structure of the present invention can be applied not only to a railway vehicle but also to a high-speed moving body such as a bus or an aircraft.

[Second Embodiment]
Next, a second embodiment of the anti-vibration floating floor structure of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.
As shown in FIG. 9, in the vibration isolator 26 of the present embodiment, an outer flange 32 </ b> B that extends radially outward is integrally formed at the lower end of the shaft member 32.

  Further, in the center of the lower mounting plate 34, there is a disc-shaped first elastic sheet 60 made of an elastic body such as rubber, a metal plate 62, and an annular second elastic body sheet 64 made of an elastic body such as rubber. The metal springs 46 are in contact with the upper surface of the metal plate 62.

Here, the vibration from the beam 18 is generated by the lower mounting plate 34 → the first elastic sheet 60 → the metal plate 62 → the metal spring 46 → the shaft member 32 → the upper mounting plate 48 → the passage floor plate 22 (or the seat floor plate 24). ) Is transmitted in this order, but the effect of blocking vibration is further enhanced by the internal damping of the first elastic sheet 60 interposed in the middle of the metal spring 46 alone.
Furthermore, in the first embodiment, when an unexpected load is applied downward, the lower end of the shaft member 32 may come into contact with the lower mounting plate 34 to generate an abnormal noise (a sound in which metals collide). In this embodiment, the metal outer flange 32B abuts on the second elastic sheet 64 made of an elastic body, and the first elastic sheet 60 and the second elastic sheet 64 made of an elastic body. Since the shock is absorbed, the generation of abnormal noise can be suppressed. Even when an unexpected load acts on the upper side, not only the displacement is limited by the outer flange 32B and the sliding member holding member 38, but also buffering is possible.

[Third Embodiment]
Next, a third embodiment of the anti-vibration floating floor structure of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same structure as embodiment mentioned above, and the description is abbreviate | omitted.
As shown in FIG. 10, in the vibration isolator 26 of the present embodiment, the lower mounting plate 34 is press-molded so that the center is convex upward, and the shallow concave portion 66 </ b> A formed at the center of the convex portion 66 is formed. The lower end of the metal spring 46 is supported.

A bellows-shaped partition wall member 68 made of an elastic body such as rubber is disposed inside the outer cylinder 30 so as to connect the lower surface of the outer flange 32B of the shaft member 32 and the lower mounting plate 34 to each other.
The partition member 68 divides the main fluid chamber 44 into two in the radial direction, and an inner fluid chamber 44A is formed on the inner side and the outer fluid chamber 44B on the outer side.

A disk-shaped diaphragm 70 made of an elastic body such as rubber is disposed below the lower mounting plate 34. The diaphragm 70 is bonded to the lower mounting plate 34 only at the periphery of the outer periphery so that a sub-fluid chamber 72 is formed between the lower mounting plate 34 and the central portion of the diaphragm 70.
An orifice (small hole) 74 is formed in the center of the recess 66A of the lower mounting plate 34.

  The inner fluid chamber 44 </ b> A and the sub fluid chamber 72 are filled with a liquid 76 such as oil or ethylene glycol, so that the liquid 76 can travel between the inner fluid chamber 44 </ b> A and the sub fluid chamber 72 via the orifice 74. It has become.

  Note that the inside of the outer fluid chamber 44B is air, and the air flows between the outer fluid chamber 44B and the outer fluid chamber 44B via a gap between the sliding member 42 and the outer peripheral surface of the shaft member 32, as in the first and second embodiments. You can move to and from the atmosphere.

In the present embodiment, when the shaft member 32 and the outer cylinder 30 are relatively displaced in the axial direction, a volume change occurs in the inner fluid chamber 44A, and the liquid 76 flows between the inner fluid chamber 44A and the auxiliary fluid chamber 72 via the orifice 74. A damping force is generated by moving back and forth. Here, when the liquid 76 moves back and forth between the inner fluid chamber 44 </ b> A and the sub fluid chamber 72 via the orifice 74, the diaphragm 70 is deformed to allow a change in the volume of the sub fluid chamber 72.
Note that a relief hole 82 is formed in the beam 18 so that the diaphragm 70 does not come into contact therewith.

Thus, since the damping force by the liquid 76 is further applied to the vibration isolator 26 of the present embodiment, the vibration damping action can be further enhanced as compared with the vibration isolator 26 of the first and second embodiments.
The vibration damping effect of the vibration isolator 26 can be adjusted by adjusting the diameter of the orifice 74, the viscosity of the liquid 76, the hardness of the diaphragm 70 against the hydraulic pressure, and the like.

[Other Embodiments]
In the said embodiment, although the shaft member 32 was attached to the floor board side and the outer cylinder 30 was attached to the beam side, you may attach the vibration isolator 26 upside down.

  In the above embodiment, the sliding member 42 is slid on the outer peripheral surface of the shaft member 32. However, the sliding member holding member 38 and the sliding member 42 are attached to the shaft member side, and the sliding member 42 is attached to the outer cylinder. You may make it slide on 30 inner peripheral surfaces.

  In the above embodiment, the metal pulling 46 is disposed inside the shaft member 32, but the metal spring 46 may be disposed outside the outer cylinder 30.

Moreover, in the said embodiment, although the vibration isolator 26 was attached on the beam 18, you may attach to the bracket 20 spanned over the beam 18 and the beam 18, as shown in FIG.11 and FIG.12. The bracket 20 extends in a longitudinal direction toward the vehicle front-rear direction, and is mounted on the upper and lower surfaces of the beam 18 and fixed to each other by a fastening member such as a screw 84, and one side of the upper portion 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. Therefore, the vibration isolator mounting portion 20C is positioned below the upper surface of the beam 18, and the floor surface can be lowered compared to the case where the vibration isolator 26 is mounted on the beam 18, and the cabin is made higher accordingly. be able to.
In the above-described embodiment, the damping force is generated by allowing the air in the main fluid chamber 44 to enter and exit from the atmosphere through the gap between the shaft member 32 and the sliding member 42. Alternatively, a hole (orifice) may be formed in the outer cylinder 30, the lower mounting plate 34, the beam 18, and the like, and air in the main fluid chamber 44 may enter and exit from the atmosphere through the hole to generate a damping force.

It is a top view which shows the inside of a vehicle. It is a width direction sectional view of vehicles. It is a top view of the floor which shows arrangement | positioning of a floor board. 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 sectional drawing of the sealing member which concerns on other embodiment. It is sectional drawing of a vibration isolator. It is sectional drawing of the vibration isolator which concerns on 2nd Embodiment. It is sectional drawing of the vibration isolator which concerns on 3rd Embodiment. It is a perspective view which shows the vehicle lower part which removed the floor board. It is sectional drawing of a vibration proof floating floor.

Explanation of symbols

10 body
12 floors
18 beams
20 Bracket
22 Passage floor board
24 Seat flooring
26 Vibration isolator
30 outer cylinder
32 Shaft member
38 Sliding member holding member
42 Sliding member
44 Main fluid chamber
44A Inner fluid chamber
44B outer fluid chamber
46 Metal spring
54 Sealing member
68 Bulkhead member
70 Diaphragm
72 Secondary fluid chamber
74 Orifice
76 liquid

Claims (7)

A vibration-isolating floating floor structure comprising a floor plate disposed on a beam provided in a vehicle body, and a vibration isolation device disposed between the beam and the floor plate,
The vibration isolator is connected to one of the floor plate and the beam, and the shaft member is connected to the other of the floor plate and the beam, and the shaft member is housed therein. A housing member having a hole to be connected, one is connected to the floor plate side, the other is connected to the beam side to support the load of the floor plate, the outer diameter portion of the shaft member, and the inner periphery of the hole of the housing member And the inner periphery of the outer diameter portion of the shaft member and the hole of the housing member when the shaft member and the housing member are relatively displaced in the axial direction. And a sliding member which is fixed to one of the surfaces and slides on the other to generate a damping force. The main fluid chamber is configured inside the housing member by closing the opening of the hole of the housing member with the shaft member and the sliding member,
A gap formed between the sliding member and the outer diameter portion of the shaft member, a gap formed between the sliding member and the inner peripheral surface of the hole of the housing member, the main fluid chamber; A volume change of the main fluid chamber is caused by relative displacement between the shaft member and the housing member through communication with at least one of a hole formed in the shaft member and a hole formed in the housing member. 2. The anti-vibration method according to claim 1, wherein a damping force is generated by causing fluid to flow back and forth between the main fluid chamber and the outside through at least one of the gap and the hole. Floating floor structure.   The anti-vibration floating floor structure according to claim 2, wherein the fluid is air. The main fluid chamber is made of an elastic material that is divided into two parts: an inner fluid chamber radially inside the shaft member and an outer fluid chamber that is arranged radially outside the inner fluid chamber and communicates with the atmosphere through the gap. A partition member;
A sub-fluid chamber independent of the main fluid chamber;
A liquid sealed between the inner fluid chamber and the sub-fluid chamber;
A diaphragm constituting a part of a partition wall of the sub-fluid chamber so that the sub-fluid chamber can be expanded and contracted;
The inner fluid chamber and the sub fluid chamber communicate with each other, and when the volume change of the inner fluid chamber occurs due to relative displacement between the housing member and the shaft member, the inner fluid chamber and the sub fluid chamber An orifice for moving the liquid back and forth to generate a damping force;
The anti-vibration floating floor structure according to any one of claims 1 to 3, characterized by comprising:   5. The anti-vibration floating floor structure according to claim 1, wherein a plurality of the floor boards are arranged on the beam, and the floor boards are separated from each other. .   The said vibration isolator is supported by the said beam through the bracket arrange | positioned so that the two said beams may be connected, or it is directly attached on the beam. Item 6. The anti-vibration floating floor structure according to any one of items 5 to 6.   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.

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