JP2008207607A - Railroad vehicle having vibration-isolating floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a railroad vehicle having a vibration-isolating floor structure capable of reducing propagation of the vibration of an upper floor to passengers while suppressing an increase of the weight as much as possible. <P>SOLUTION: The vibration-isolating floor structure of the railroad vehicle comprises a cushion material 13 arranged on a floor surface of an upper floor 12, a hard synthetic resin-made sheet 14 arranged on the cushion material 13, and a carpet 15 arranged on the hard synthetic resin-made sheet 14. The vibration-isolating floor structure is preferably arranged on a foot-side part 11a when a passenger is seated between front and rear seats. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a railway vehicle having an anti-vibration floor structure, and more particularly to a railway vehicle having an anti-vibration structure that absorbs vibration transmitted from a floor surface to a foot.

As a floor structure for high-speed railway vehicles, a structure is adopted in which an airtight floor is provided on the underframe and a floor support is placed, the upper floor is supported by this floor support, and an air conditioning duct is placed between the airtight floor and the upper floor. Has been. In many cases, a structure in which an anti-vibration rubber is interposed in the floor support as a countermeasure against noise and vibration is adopted on the carriage. Lightweight and highly rigid aluminum honeycomb plates are generally used for the upper floor. In general cars, floor coverings are provided from the viewpoint of waterproofing, floor board protection and design, and in special cars, waterproofing is provided on the upper floor. A deuteron is provided via a sheet (see, for example, Patent Document 1). Moreover, in a railway vehicle having such a floor structure, in order to suppress noise intrusion into the cabin and vibration of the floor surface, a sound insulating material and a vibration isolating material are disposed between the airtight floor and the upper floor. In order to improve the sound insulation performance and the vibration insulation performance, various proposals have conventionally been made regarding the material and configuration of the sound insulation material and the vibration insulation material (for example, see Patent Document 2).
JP 2003-146209 A Japanese Patent No. 3615215

  In general, as conventional noise insulation and anti-vibration measures in railway vehicles, the noise generated in the running carriage is transmitted through an airtight floor, sound insulation and vibration isolator, floor covering and jute, and transmitted sound. The main purpose is to suppress the vibration generated in the running cart part from solid sound that vibrates the upper floor through the traction device, underframe, and floor support, It is effective in reducing noise in the high frequency range.

  On the other hand, in a railway vehicle equipped with underfloor equipment such as an air conditioner and a blower motor unit, there is a problem that the vibration of the upper floor due to vibration generated in the underfloor equipment makes passengers feel uncomfortable, and there is a need for improvement. In particular, it is necessary to further strengthen measures for special vehicles that aim to provide a more comfortable cabin space. In addition, vibrations are often bothered by running vibrations while the vehicle is running, but only vibrations caused by underfloor equipment are generated while the running vibration disappears. I am often worried.

  However, sound insulation and vibration isolators that have been used in the past are effective for noise and vibration in the high frequency range, but can sufficiently reduce the vibration in the low frequency range of 60 to 300 Hz. There wasn't. Although the mass effect of the floor board material can be expected to reduce the vibration in the low frequency range, it is difficult to use it in a railway vehicle whose weight has been reduced. In addition, it is possible to reduce the vibration transmitted from the underframe to the upper floor by reducing the number of floor support installation points, but vibration propagation occurs at the floor support installation point. It is necessary to increase the rigidity of the receiver, which also causes a substantial increase in weight.

  Therefore, an object of the present invention is to provide a railway vehicle having a vibration-isolating floor structure capable of reducing the transmission of vibrations of the upper floor to passengers while suppressing an increase in weight as much as possible.

  In order to achieve the above object, a railway vehicle having a vibration-proof floor structure according to the present invention has a cushioning material disposed between the floor and the deuteron in a railway vehicle provided with a deuteron on the floor of a vehicle body. In addition, a hard synthetic resin sheet is interposed between the cushion material and the deuteron. In addition, the vibration-proof floor structure of the present invention is characterized in that the cushion material is disposed at a foot portion when seated, and the cushion material is formed of a porous material or a fibrous material.

  According to the railway vehicle provided with the vibration-proof floor structure of the present invention, the vibration of the upper floor can be absorbed by the cushion material, and in particular, the unpleasant feeling given to passengers who are stopped can be eliminated. Moreover, the effect of reducing vibration is improved by disposing the waterproof sheet above the cushion material and below the cushion material on the floor surface and between the cushion material and the jute. In addition, in special vehicles with basic seating, it is possible to expect a sufficient effect just by placing it on the foot part when sitting, eliminating the fluffy feeling when walking in the aisle, and minimizing the weight increase .

  FIG. 1 is a cross-sectional view of a main portion showing an example of a floor portion in a railway vehicle having a vibration-proof floor structure of the present invention, FIG. 2 is a plan view showing an arrangement example of the vibration-proof floor structure, and FIG. It is III-III sectional drawing of.

  The anti-vibration floor structure for reducing vibration in the railway vehicle 11 includes a cushion material 13 disposed on the floor surface of the upper floor 12, a hard synthetic resin sheet 14 disposed on the cushion material 13, and the hard And a deuteron 15 disposed on the synthetic resin sheet 14. The material and thickness of the upper floor 12 are not particularly limited, and can be supported on the frame with an arbitrary structure. For example, as described in Patent Document 1, an airtight floor is provided on the frame. It is possible to employ a structure in which a floor support is disposed and an aluminum honeycomb plate serving as an upper floor is supported on the floor support through vibration-proof rubber. In addition, on the lower surface of the upper floor 12, a sound insulating material and a vibration isolating material as described in Patent Document 2 can be arranged.

  The cushion material 13 is made of various porous materials such as urethane and melamine sponges, and various fibrous materials typified by polyester, for example, a low hardness silicon sheet or urethane sheet in a plate shape having an appropriate thickness. What was shape | molded can be used. The thickness of the cushion member 13 can be determined in consideration of the vibration reduction effect. However, when the thickness is 10 mm or more, the vibration reduction effect is increased, but a fluffy feeling is generated during walking, and a sense of incongruity is felt. In addition, as shown in the present embodiment, in the case where the cushion material is provided only on a part of the floor, a step is generated between the portion where the cushion material 13 is provided and the portion where the cushion material 13 is not provided. Absent. The flexibility and elastic restoring force of the cushioning material 13 are related to the thickness of the cushioning material 13, but are not deformed greatly by the weight of the foot when seated and sufficient flexibility and elastic restoring force to reduce vibration. It is set to be able to demonstrate. In addition, by using a porous material or the like as the cushion material 13, the sound absorption capability of the deutan 15 can be increased, and the quietness in the vehicle can be improved.

  The hard synthetic resin sheet 14 and the deuteron 15 are not particularly limited in materials and the like, and those generally adopted widely can be used. Although various synthetic resin sheets can be used for the hard synthetic resin sheet 14, in order to suppress the fluffy feeling of the cushion material 13, for example, various synthetic resin sheets having a thickness of about 1 to 2 mm, for example, polyolefin Various synthetic resin sheets made of polyester, polystyrene, polypropylene, polyvinyl chloride, polymethyl methacrylate, polycarbonate, and the like can be used, and at least one that is harder than the cushioning material 13 or the deuteron 15 is selected. Moreover, the hard synthetic resin sheet 14 can also be previously bonded to the upper surface of the cushion material 13 with an adhesive or the like. Furthermore, the hard synthetic resin sheet 14 having a waterproof property is used, and the conventional waterproof sheet provided on the upper floor 12 can be omitted by providing the hard synthetic resin sheet 14 on the entire back surface of the deuteron 15. it can.

  As shown in FIGS. 2 and 3, the anti-vibration floor structure provided with such a cushion material 13 is a foot portion when a passenger is seated on the seat 16 between the seats 16 and at the end of the vehicle in the railway vehicle 11. It is preferable to arrange only at 11a. That is, the passage portion 11b in the center of the vehicle is formed by the cushion material 13 when walking along the passage portion 11b by providing the hard synthetic resin sheet 14 and the deutan 15 on the floor surface of the upper floor 12 and omitting the cushion material 13. The fluffy feeling can be eliminated and the vehicle sales wagon will not be adversely affected. On the other hand, by providing the cushion member 13 on the foot portion 11a when seated, vibrations experienced on the soles of the passengers when seated can be reduced, so that discomfort felt while stopping can be eliminated. In addition, by providing the cushion material 13 at the minimum position of the foot portion 11a, the amount of use of the cushion material 13 can be reduced as compared with the case where the cushion material 13 is provided on the entire upper floor 12, so that the manufacturing cost can be reduced. Rise and increase in vehicle weight can be minimized.

  Further, it is possible to provide the hard synthetic resin sheet 14 on the floor surface of the upper floor 12 as in the case of a conventional waterproof sheet, and to dispose the cushion material 13 thereon, but the hard synthetic resin sheet 14 is disposed on the upper floor 12. Compared to the case where the cushioning material 13 and the deuteron 15 are arranged in this order, the cushioning material 13 is arranged on the floor surface of the upper floor 12 and then the hard synthetic resin sheet 14 and the deuteron 15 are arranged in this order. The reduction effect can be improved. Furthermore, by providing the cushioning material 13 under the deuteron 15 and the hard synthetic resin sheet 14, even if the cushioning material 13 is sagged after many years of use, it is only necessary to turn the deuteron 15 and the hard synthetic resin sheet 14. It can be easily replaced, and maintenance is easier compared to a conventional sound insulation material or vibration isolation material provided under the upper floor 12.

  In addition, when providing the cushioning material 13 in a part of floor surface, the influence of the level | step difference when using a thicker cushioning material can be reduced by cutting the periphery of the cushioning material 13 diagonally. Further, the thickness of the hard synthetic resin sheet 14 is set to be thin at the foot portion 11 a where the cushion material 13 is provided and thick at the passage portion 11 b where the cushion material 13 is not provided, or a recess corresponding to the cushion material 13 is provided on the upper floor 12. It is also possible to eliminate the level difference.

Next, a result of an experiment for confirming the effect of providing the cushion material 13 will be described. In the experiment, a vibration test apparatus 20 shown in the schematic diagram of FIG. 4 is used, a test piece 23 is placed on the upper surface of an aluminum honeycomb plate 22 supported by a spring 21 so as to be movable up and down, and further seated on the test piece 23. In a state where a weight (weight 5 kg, bottom area 257 cm ² ) 24 corresponding to the weight of the foot is placed, vibration is applied to the aluminum honeycomb plate 22 from the electromagnetic vibrator 25 disposed below the aluminum honeycomb plate 22, The movement of the weight 24 was measured by the acceleration pickup 26.

  As the test piece 23, a conventional structure in which the synthetic resin sheet 14 is bonded to the back surface of the deuteron 15 (the structure adopted in the passage portion 11b in the above embodiment) is used. A synthetic resin sheet 14 was bonded to the substrate and a deutan 15 was placed thereon (the structure adopted in the foot portion 11a in the embodiment). As the deuteron 15, the same structure was used for the conventional structure and the structure of the present invention. A melamine foam material having a thickness of 10 mm was used for the cushion material 13, and a polyolefin sheet having a thickness of 1.2 mm was used for the synthetic resin sheet 14. The sinking amount of the test piece 23 when the weight 24 was placed was 0.4 mm in the conventional structure and 0.7 mm in the structure of the present invention. The measurement results are shown in FIG.

  From this result, it can be seen that the vibration can be reduced in the frequency range of 60 to 300 Hz only by inserting the cushion material 13 in which the synthetic resin sheet 14 is bonded under the deuteron 15. Moreover, although illustration is abbreviate | omitted, when the cushion material 13 was inserted between the synthetic resin sheet 14 and the deuteron 15, the vibration reduction effect to some extent was acquired, but the effect was smaller than the said experimental result.

It is sectional drawing of the principal part which shows one example of this invention. It is a top view which shows the example of arrangement | positioning of a vibration-proof floor structure. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is the schematic of a vibration experiment apparatus. It is a figure which shows the relationship between the frequency measured in experiment, and a vibration acceleration level.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Railcar, 11a ... Underfoot part, 11b ... Passage part, 12 ... Upper floor, 13 ... Cushion material, 14 ... Hard synthetic resin sheet, 15 ... Deuteron, 16 ... Seat, 20 ... Vibration test apparatus, 21 ... Spring, 22 ... Aluminum honeycomb plate, 23 ... Test piece, 24 ... Weight, 25 ... Electromagnetic vibrator, 26 ... Accelerometer

Claims (4)

  A railway vehicle having a vibration-proof floor structure, wherein a cushioning material is disposed between the floor surface and the deuteron in a railway vehicle having a deuteron provided on a floor surface of a vehicle body.   The railway vehicle having a vibration-proof floor structure according to claim 1, wherein a hard synthetic resin sheet is interposed between the cushion material and the deuteron.   The railway vehicle having a vibration-isolating floor structure according to claim 1, wherein the cushion material is disposed at a foot portion when seated.   The railway vehicle having a vibration-proof floor structure according to any one of claims 1 to 3, wherein the cushion material is formed of a porous material or a fibrous material.

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