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JP-2026074661-A - Rail vehicles

JP2026074661AJP 2026074661 AJP2026074661 AJP 2026074661AJP-2026074661-A

Abstract

[Problem] To provide a rail vehicle that improves sound transmission loss and reduces noise without increasing the weight of the vehicle. [Solution] A rail vehicle having a body with a frame and a bogie supporting the frame, wherein the frame has an upper floor disposed on the body side, an airtight floor disposed on the bogie side, and a plurality of support members disposed in connection with the upper floor and the airtight floor, the support members are arranged in rows at predetermined intervals along the longitudinal direction of the body, a plurality of rows of support members are arranged along the width direction of the body, and when two adjacent rows of support members in the width direction are viewed in the width direction of the body, the support members of one row are positioned between the support members of the other row that are adjacent in the longitudinal direction of the body. [Selection Diagram] Figure 8

Inventors

  • 冨田 斉央
  • 瀬畑 美智夫

Assignees

  • 株式会社日立製作所

Dates

Publication Date
20260507
Application Date
20241021

Claims (6)

  1. A rail vehicle having a body with a frame and a bogie that supports the frame, The aforementioned frame is The upper floor located on the vehicle body side, The airtight floor located on the trolley side, It has a plurality of support members arranged in connection with the upper floor and the airtight floor, The support members are arranged in rows at predetermined intervals along the longitudinal direction of the vehicle body. Multiple rows of the support members are arranged along the width direction of the vehicle body. When two rows of support members adjacent in the width direction are viewed in the width direction of the vehicle body, the support members of one row are positioned between the support members of the other row that are adjacent in the longitudinal direction of the vehicle body. A rail vehicle characterized by the following features.
  2. In the rail vehicle described in claim 1, The aforementioned support member is The upper floor support member that abuts against the upper floor, The floor support has the upper end attached to the upper floor support member and the lower end joined to the airtight floor, A rail vehicle characterized by the following features.
  3. In the rail vehicle described in claim 1, When two adjacent rows of support members in the width direction are viewed in the width direction of the vehicle body, the center of the support member in one row coincides with the midpoint of the line segment connecting the centers of adjacent support members in the longitudinal direction of the vehicle body in the other row. A rail vehicle characterized by the following features.
  4. In the rail vehicle described in claim 1, Reinforcing ribs are placed on the lower surface of the upper floor. When the two rows of support members adjacent in the width direction are viewed in the longitudinal direction of the vehicle body, the reinforcing ribs protrude toward the side structure side of the vehicle body relative to the two rows of support members. A rail vehicle characterized by the following features.
  5. In the rail vehicle described in claim 1, Reinforcing ribs are placed on the upper surface of the aforementioned upper floor. The reinforcing ribs are arranged to connect a pair of legs of a seat that is installed on the upper floor spaced apart in the width direction of the vehicle body. A rail vehicle characterized by the following features.
  6. In the rail vehicle described in claim 5, The reinforcing rib is a rectangular plate with a thickness equal to the longitudinal dimension of the vehicle body, a width equal to the height dimension of the vehicle body, and a total length equal to the width dimension of the vehicle body. The width is greater than the thickness, and the total length is greater than the width. One end of the width is fixed to the airtight floor, and both ends of the total length are fixed to the legs of the seat. A rail vehicle characterized by the following features.

Description

This invention relates to rail vehicles. Traditionally, efforts have focused on improving the sound transmission loss of various parts of rail vehicles to reduce in-vehicle noise. It is generally known that sound transmission loss increases with increasing surface density (mass per unit area) of the material through which sound passes, and with increasing sound frequency. Based on this understanding, increasing the surface density of materials would be one way to improve sound transmission loss. However, rail vehicles are subject to axle load limitations imposed by the design loads of the railway lines they operate on, making it impossible to simply increase surface density. Furthermore, in recent years, railway operators have been striving to achieve carbon neutrality by aiming for virtually zero CO2 emissions. Given the positive correlation between CO2 emissions and energy consumption, they are focusing on reducing CO2 emissions related to vehicle operation, which accounts for the majority of energy consumed in railway operations. One factor that reduces the energy required for vehicle operation is vehicle weight reduction. Therefore, measures such as increasing the surface density of materials to reduce in-car noise are difficult to apply, especially considering efforts toward achieving carbon neutrality. Japanese Patent Publication No. 2006-240482 Figure 1 is a side view of a railway vehicle.Figure 2 is a cross-sectional view (section A-A in Figure 1) of a railway vehicle intersecting in the longitudinal direction.Figure 3 is a detailed cross-sectional view of the floor section (section C in Figure 2) that intersects the longitudinal direction of the railway vehicle.Figure 4 is a perspective view of the floor structure of the comparative example.Figure 5 shows the natural vibration modes of the upper floor in the comparative example floor structure.Figure 6 shows the representative structure of the floor section of the comparative example and the natural vibration modes of the upper floor (section D in Figure 5).Figure 7 is a cross-sectional view (corresponding to the B-B section in Figure 2) of the floor structure of the comparative example, where the railway vehicle intersects vertically.Figure 8 is a cross-sectional view (section B-B in Figure 2) of the floor section that intersects vertically in a railway vehicle, relating to Embodiment 1 of the present invention.Figure 9 is a diagram showing a representative structure of the floor portion according to Embodiment 1 of the present invention, and corresponds to part D in Figure 5.Figure 10 is a detailed cross-sectional view (corresponding to section C in Figure 2) of the floor section intersecting in the longitudinal direction of a railway vehicle, relating to Embodiment 2 of the present invention.Figure 11 is a diagram showing a representative structure of the floor portion according to Embodiment 2 of the present invention, and corresponds to part D in Figure 5.Figure 12 is a detailed cross-sectional view (corresponding to section C in Figure 2) of the floor section intersecting in the longitudinal direction of a railway vehicle, relating to Embodiment 3 of the present invention.Figure 13 is a diagram showing a representative structure of the floor portion according to Embodiment 3 of the present invention, and corresponds to part D in Figure 5. Rail vehicles are vehicles that operate along laid tracks, and include railway cars, monorail cars, new transit system vehicles, and trams. Below, we will explain rail vehicles using railway cars as a representative example. The front-to-back direction (rail direction) of the railway vehicle 100 is defined as the x-axis direction, the left-to-right direction (sleeper direction or width direction) of the railway vehicle 100 is defined as the y-axis direction, and the vertical direction intersecting the x-axis and y-axis directions is defined as the z-axis direction. Figure 1 is a side view of a railway vehicle. The railway vehicle 100 comprises a car body 110 and a pair of bogies 120 that support the vicinity of both ends of the car body 110 in the x-axis direction, where passengers and other passengers ride. The car body 110 consists of a frame 111 that forms the floor and is supported by the bogies 120, side structures 112 erected at both ends of the frame 111 in the y-axis direction, end structures 114 erected at both ends of the frame 111 in the x-axis direction, and a roof structure 113 placed on the upper ends of the side structures 112 and end structures 114. The railway vehicle 100 consists of underfloor equipment such as an air conditioning or ventilation system (hereinafter referred to as the air conditioning/ventilation system) 10, and interior equipment such as an air conditioning control device (including power supply) 50 and a vehicle control device 51, and operates along a track 130 laid on the ground. Figure 2 is a cross-sectional view of a railway vehicle intersecting the longitudinal directi