JP5390481B2 - Railcar floor structure - Google Patents

Description

  The present invention relates to a railcar floor structure, and more particularly, to a railcar floor structure that suppresses vibrations in combination with sound insulation of rolling noise that is propagated from a track side to a passenger cabin side.

  Quietness is important for the comfort of in-car living, and various sound insulation and vibration control are achieved in the floor structure. In order to reduce in-vehicle noise, it is important to suppress vibration radiated sound generated when the vehicle body structure vibrates. For this purpose, it is also effective to reduce vibration radiation sound by suppressing vibrations and to insulate rolling noise generated by contact between wheels and rails when the vehicle is traveling. In particular, since the floor structure portion becomes a path for propagating rolling noise in the vehicle in the carriage portion, it is important to suppress the rolling noise and vibration in the floor structure.

  In Patent Document 1 below, a vibration absorbing layer made of a high elastic material having a low Young's modulus is formed on a corrugated plate also called a keystone plate, and the vibration absorbing layer is made of a low elastic material having a high Young's modulus. A load-bearing layer is formed, and vibration from the vehicle floor can be absorbed by the high elastic behavior of the vibration-absorbing layer to reduce radiated sound into the vehicle, and transmitted sound from the floor is blocked by the low-elastic behavior of the load-bearing layer. And the technique which can satisfy the depression strength with respect to the high heel of a female customer's shoes is disclosed.

JP 2008-213652 A

  However, the thing of patent document 1 pays attention to the fact that the elastic material advantageous for sound insulation is low elasticity, and arranges it as a load-bearing layer inside the vehicle rather than the high elastic material advantageous for vibration damping. And the depression strength of high-heeled shoes of female customers. For this reason, a vibration absorbing layer made of a highly elastic material that is advantageous for vibration absorption is disposed on the corrugated plate. Even if vibration suppression is achieved by utilizing the high elastic behavior, the supporting force and restraining force for the load bearing layer However, it is particularly weak at the troughs of the corrugated sheet, and there is a problem that the load bearing layer cannot exhibit sufficient depression strength, and there is also a problem of impairing the vibration damping property due to low elastic behavior.

  Moreover, although patent document 1 says that the sum in the high frequency band of 100-4kHz is reduced, it disturbs the frequency band of the rolling sound used as the generation | occurrence | production of the peculiar noise from under the floor, especially a passenger's mind. There is no evaluation of noise reduction by specifying 500 to 2 kHz or 800 to 2 kHz, and the conditions for that are not mentioned.

  In view of such a problem, an object of the present invention is to provide a floor structure of a railway vehicle that is excellent in vibration damping and particularly excellent in sound insulation against rolling noise.

  The floor structure of a railway vehicle according to the present invention has an effective thickness on a metal corrugated plate, and a sound insulation elastic layer that insulates sound including rolling noise transmitted from the wheel and the rail side through the corrugated plate. It is formed so as to exceed the peak of the corrugated plate, and a damping elastic layer that absorbs vibration is formed on the sound insulating elastic layer. The sound insulating elastic layer has a higher hardness than the vibration suppressing elastic layer and The thickness of the vibration elastic layer is larger than the thickness above the peak portion of the corrugated sheet in a range exceeding the total thickness of the sound insulating elastic layer, and a floor covering is stuck on the vibration damping elastic layer. It is characterized by the total thickness of commuting or express vehicle specifications.

  In such a configuration, rolling noise that propagates from the wheels and rails through the corrugated sheet on the corrugated sheet made of metal such as stainless steel, satisfying the total thickness of commuting or express vehicle specifications is included. A sound-insulating elastic layer that insulates sound, a vibration-damping elastic layer that absorbs vibration, and floor coverings are laminated on top of the corrugated sheet, so that a sound-insulating elastic layer is provided on the basis of sufficient support and restraint by the corrugated sheet. In addition to satisfying the effective thickness on the peak portion as well as the trough portion of the corrugated plate, it is possible to perform sound insulation of the transmitted sound by fully utilizing the low elastic behavior. In addition, since the vibration-damping elastic layer is provided on the sound insulating elastic layer, the thickness of the sound insulating elastic layer is higher than the thickness of the corrugated plate on the top of the corrugated plate by an amount less restrictive than that provided on the corrugated plate. Taking advantage of its large size, it is easy to exhibit vibration suppression characteristics due to its high elastic behavior. Further, since the sound insulating elastic layer is a low elastic material, even if the upper layer is a vibration-damping elastic layer made of a high elastic material, no shoe noise is generated even on the crest of the corrugated plate, and the load on the foot is small.

  In the above, the sound insulating elastic layer may be a coating material made of an epoxy resin floor filling material in which an epoxy resin is mixed with a lightweight artificial bone material.

  In such a configuration, in addition to the above, a commercially available product as a coating material can be used for the sound insulating elastic layer, and the corrugated plate surface can be filled up to a predetermined height by a coating operation.

  In the above, the vibration-damping elastic layer is made of rubber and may be composed of a rubber chip and a binder that connects the rubber chip.

  In such a configuration, in addition to the above, the sound insulation, vibration suppression, and heat insulation by the hole structure are excellent.

  In the above, the floor covering may be made of vinyl chloride or rubber.

  In such a configuration, in addition to the above, the vinyl chloride or rubber-based floor covering as an elastic flooring can satisfy the cushioning properties and appearance required for the floor on the outermost surface.

  In the above, further, the corrugated plate has a peak height of 13 mm to 25 mm, the sound insulating elastic layer has a thickness of 20 mm to 33 mm at the corrugated portion corresponding to the corrugated portion, and the damping elastic layer has a thickness of 13 mm to 17 mm. The floor covering has a thickness of 2 mm to 4 mm, and the total thickness of the floor can be a standard specification for a commuter vehicle or a standard specification for an express vehicle.

  In such a configuration, in addition to the above, the floor thickness that satisfies the standard specifications for commuter vehicles and limited express vehicles is used to control vibrations according to the characteristics of the vibrations and rolling noises of each type of vehicle, carriage, etc. Sound insulation measures can be taken. However, in the current underfloor equipment installation status, the standard specification for commuter vehicles related to the total thickness of the floor is 40 mm, the standard specification for express vehicles is 50 mm, etc. Therefore, the damping performance can be improved by increasing the thickness of the damping elastic layer.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Further, each feature of the present invention can be employed alone or in combination in various combinations as much as possible.

  Satisfying the total thickness of commuting or express vehicle specifications, the sound insulation elastic layer on the corrugated sheet is based on the support and restraint by the corrugated sheet, taking advantage of the low elastic behavior not only in the trough of the corrugated sheet but also in the mountain, In particular, it is possible to effectively insulate a rolling sound that is said to be difficult to suppress at a frequency of 500 to 800 to 2 kHz. In addition, the elastic damping layer on the sound insulation elastic layer is less elastic than the case on the corrugated sheet, so that the elastic insulation layer has a higher elasticity than the thickness of the corrugated sheet on the peak. By making good use of the behavior, it is possible to exhibit high vibration damping and reduce radiated sound. Further, since the sound insulating elastic layer is a low elastic material, even if the upper layer is a vibration-damping elastic layer made of a high elastic material, no shoe noise is generated even on the crest of the corrugated plate, and the load on the foot is small.

It is sectional drawing which shows one specific example in the case of the commuting vehicle regarding the floor structure of the rail vehicle which concerns on embodiment of this invention. It is sectional drawing which compares and shows the corrugated sheet example mainly used for a commuting vehicle, and the corrugated sheet example mainly used for an express vehicle divided into (a) and (b). The result of in-vehicle noise tests at the center in the left-right direction inside the vehicle at the top of the carriage and the center in the left-right direction above the floor when vibrating from below the floor is the case of the conventional floor structure without a pad and 1 of the present invention. It is a graph which compares and shows one specific example divided into (a) and (b).

  Hereinafter, the floor structure of a railway vehicle according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 for the understanding of the present invention. The following description and illustrations are specific examples of the present invention and do not limit the matters described in the claims.

  In a railway vehicle, the frequency band of noise transmitted from the outside of the vehicle to the inside of the vehicle is generally about 500 Hz to 5 kHz. In addition, the rolling noise that is easily disturbed by passengers is 500 to 800 Hz to 2 kHz. In particular, the present embodiment enables vibration suppression to be maintained and a quiet in-vehicle environment to be maintained in addition to effectively blocking rolling noise.

  The railcar floor structure 100 of the present embodiment shown in FIG. 1 insulates the sound including the rolling noise of the wheels propagating from the rail side via the corrugated plate 1 on the corrugated plate 1 made of metal. The sound insulation elastic layer 2 is formed so as to satisfy the effective thickness so as to exceed the crest 1a of the corrugated sheet 1, and the vibration suppression elastic layer 3 that absorbs vibration is formed on the sound insulation elastic layer 2, so that the sound insulation elasticity The layer 2 is harder than the damping elastic layer 3, and the thickness of the damping elastic layer 3 is smaller than the total thickness of the sound insulating elastic layer 2 and larger than the thickness above the peak 1 a of the corrugated plate 1. The floor covering 4 is pasted on the damping elastic layer 3 so as to have a total thickness for commuting or express vehicle specifications.

  In this way, rolling noise transmitted from the wheels and rails via the corrugated plate 1 is included on the corrugated plate 1 made of metal such as stainless steel, satisfying the total thickness of commuting or express vehicle specifications. Sufficient support by the corrugated plate 1 because the sound insulating elastic layer 2 is provided on the corrugated plate 1 for laminating the sound insulating elastic layer 2 for insulating sound, the damping elastic layer 3 for absorbing vibration, and the floor covering 4. In addition, based on the restraint, not only the valley portion 1b of the corrugated plate 1 but also the effective thickness is satisfied on the peak portion 1a, and the transmitted sound can be absorbed by fully utilizing the low elastic behavior. Moreover, since the damping elastic layer 3 is provided on the sound insulating elastic layer 2, the amount of the crest 1a of the corrugated plate 1 of the sound insulating elastic layer 2 is less than that provided on the corrugated plate 1. Taking advantage of the thickness larger than the above, it is easy to exhibit sound insulation characteristics due to high elastic behavior. Further, since the sound insulation elastic layer 2 is a low elastic material, even if the pressure is increased in the trough portion 1b of the corrugated sheet 1, the load insulation is superior to that of the low elastic material, and the high elastic material thereon is used. Since a certain vibration-damping elastic layer 3 is supported, even if the upper layer is a vibration-damping elastic layer 3 made of a highly elastic material, not only on the peak portion 1a of the corrugated sheet 1, but also on the valley portion 1b, high heels, etc. Enough to suppress the decline.

  As a result, the total thickness of the commuting or express vehicle specification is satisfied, and the sound insulating elastic layer 2 is supported on the corrugated plate 1 by the corrugated plate 1 and supported by the corrugated plate 1 as well as the valley 1b of the corrugated plate 1 and the mountain portion. Even in the case of 1a, it is possible to effectively insulate a rolling sound called a frequency 500 or 800 to 2 kHz which is difficult to suppress, taking advantage of the low elastic behavior. Further, the damping elastic layer 3 on the sound insulating elastic layer 2 is less constrained than that on the corrugated plate 1, and the thickness of the sound insulating elastic layer 2 on the peak portion 1a of the corrugated plate 1 is less than the thickness. By taking advantage of the high elastic behavior due to its large size, it is possible to exhibit high vibration damping and reduce radiated sound. Therefore, it is easy to guarantee a quiet environment by effectively isolating and damping the rolling sound into the vehicle.

  Further, since the sound insulating elastic layer 2 is a low elastic material, the damping elastic layer 3 is supported by exhibiting an excellent load resistance as compared with the high elastic material even by the pressure increase in the valley portion 1b of the corrugated plate 1. Therefore, in cooperation with the sandwich structure with the floor covering 4, the damping elastic layer 3 is not affected by the fact that it is a highly elastic material, but not only on the peak portion 1a of the corrugated plate 1 but also on the valley portion 1b. Even if there is, it is possible to sufficiently suppress the fall of high heels, etc., and not only to reach the corrugated sheet 1 but also to catch the passenger and feel uneasy about the passengers.

  Here, the sound insulation elastic layer 2 is preferably composed mainly of an epoxy resin, but is more preferably a coating material made of an epoxy resin floor filling material in which an epoxy resin material is mixed with a lightweight artificial bone material. is there. A lightweight artificial aggregate can effectively reduce the elasticity of the epoxy resin without increasing its weight and exhibit excellent sound insulation. Such artificial aggregates can be obtained as, for example, lightweight artificial aggregates (Unicaron (trade name)) manufactured and sold by Takaken Materials Manufacturing Co., Ltd., and epoxy resin materials are manufactured and sold by, for example, Takaken Materials Manufacturing Co., Ltd. It can be obtained as an epoxy resin flooring (trade name UNITEX E2). This commercially available epoxy resin-based flooring is provided in combination with an epoxy resin for undercoating and an epoxy resin for intermediate and overcoating, both of which are blended at a ratio of 7: 3 of main material and curing agent. It is. The former main material has a viscosity of 230 to 30 (CP / 25 ° C.), the curing agent has a viscosity of 1300 to 1700 (CP / 25 ° C.), and the latter main material has a viscosity of 900 to 1300 (CP / 25 ° C.). The viscosity of the agent is 3100-4100 (CP / 25 ° C.).

Thus, the epoxy resin floor filling can fill the corrugated plate surface to a predetermined height by a coating operation using a commercial product as a coating material for the sound insulating elastic layer 2. Specifically, in the standard work specification by Takara Kenshi Seisakusho Co., Ltd., as a pretreatment, the dirt is removed and the primer is applied. Next, as the undercoating, the main material of the epoxy resin for the undercoating and the curing agent are mixed on the surface of the corrugated sheet 1, and a thin film is applied with a brush. An epoxy resin mixed with a main material and a curing agent is mixed on the undercoat and the light-weight artificial bone described above, and is spread smoothly with a trowel. Therefore, the thickness of the sound insulation elastic layer 2 is an epoxy resin floor filling. With respect to this epoxy resin floor filling, the compression strength is 73 to 83 (kg / cm ² ), and the depression strength is 410 to 450 (kgf / 10φ).

  On the other hand, the vibration-damping elastic layer 3 is mainly rubber, and in particular, is composed of a rubber chip and a binder that connects the rubber chip. As a result, the sound insulation, vibration proofing, and the heat insulating action by the hole structure are further improved. Further, the floor covering 4 can be made of vinyl chloride or rubber. Thereby, the vinyl chloride or rubber-type floor covering 4 as an elastic flooring can satisfy the cushioning properties and appearance required for the floor on the outermost surface. Such an elastic material composed of a rubber chip and a binder is already known such as a rubber chip recycled into a rubber chip, for example, a rubber material having a particle diameter of about 1 mm or 2 and mixed (for example, gradation manufactured by Nitto Kako (trade name)) The elasticity of the damping elastic layer 3 can be adjusted by the material, size, blending ratio, etc. of the chip. For example, the applicant previously proposed that this is satisfied (Japanese Patent Laid-Open No. 2001-81226), “KS non-brene (trade name)” manufactured by Kinki Vehicle Co., Ltd. Good. As a specific example, an elastomer alone such as rubber, for example, a material obtained by chopping an old tire or the like is used, and an epoxy resin equivalent to the conventional one is used as the binder.

  The corrugated plate 1 is a dimensional example shown in FIG. 2A having a mountain height of 13 mm mainly for commuting vehicles to 25 mm mainly for express vehicles shown in FIG. 2B. Corresponding to what has, the sound insulation elastic layer 2 has a thickness of 20 mm to 33 mm at the position corresponding to the valley 1 b of the corrugated plate 1, the vibration damping elastic layer 3 has a thickness of 13 mm to 17 mm, and the floor covering 4 The total thickness of the floor can be standard specifications for commuting vehicles and standard specifications for express vehicles. As a result, vibration suppression and sound insulation measures according to the characteristics of the vibration and rolling noise of each type of vehicle, bogie, etc. can be achieved with the total thickness of the floor satisfying the standard specifications of commuter vehicles and express vehicles. However, in the current underfloor equipment installation status, the standard specification for commuter vehicles related to the total thickness of the floor is 30 mm, the standard specification for express vehicles is 50 mm, etc. Therefore, the damping property can be further increased by increasing the thickness of the damping elastic layer.

  Incidentally, the railcar floor structure 100 of the present embodiment shown in FIG. 1 is an example in which the corrugated plate 1 shown in FIG. 2A is adopted, and the height of the corrugated plate 1 (existing) The thickness of the sound insulation elastic layer 2 (thickness at the valley 1b) is 22 mm, and therefore the thickness at the peak 1a is 9 mm, and the thickness of the damping elastic layer 3 is 15 mm. The thickness of the floor covering 4 is 3 mm.

  In this example, the interior noise experiment at the center in the left-right direction in the upper part of the carriage and the center in the left-right direction on the floor when being vibrated from under the floor is equivalent to supporting the corrugated sheet 1 with a large frame. As a result of carrying out in the restrained state, it became as shown in FIG. When this is compared with FIG. 3 (b) showing the experimental results in the conventional case without filling, it can be seen that a remarkable sound insulation effect can be exhibited particularly in the rolling sound range of 800 Hz to 2 kHz as a sound insulation target. .

  INDUSTRIAL APPLICABILITY The present invention can be practically used for a floor structure of a railway vehicle, and can effectively suppress vibration mainly from rolling under the floor and also realize vibration suppression to reduce vibration radiation sound.

DESCRIPTION OF SYMBOLS 1 Corrugated plate 1a Mountain part 1b Valley part 2 Sound insulation elastic layer 3 Damping elastic layer 4 Floor covering

Claims (4)

  On the corrugated metal plate, a sound-insulating elastic layer that insulates sound including rolling noise that propagates from the wheels and rails through the corrugated sheet exceeds the peak of the corrugated sheet with an effective thickness. A vibration-damping elastic layer that absorbs vibration is formed on the sound-insulating elastic layer. The sound-insulating elastic layer is harder than the vibration-damping elastic layer, and the thickness of the vibration-damping elastic layer is A floor covering is pasted on the damping elastic layer in a range that is smaller than the thickness equivalent to the depth of the corrugated valley of the corrugated sheet and larger than the upper thickness of the corrugated sheet. Or a railcar floor structure characterized by the total thickness of the express vehicle specification.   The railway vehicle floor structure according to claim 1, wherein the sound insulating elastic layer is a coating material made of a resin-based floor filling material in which a resin is mixed with a lightweight artificial aggregate.   The floor structure of a railway vehicle according to any one of claims 1 and 2, wherein the vibration-damping elastic layer is made of rubber and includes a rubber chip and a binder that connects the rubber chip.   The floor structure of a railway vehicle according to any one of claims 1 to 3, wherein the floor covering is made of vinyl chloride or rubber.