JPS6212067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-noise wheel compartment of a monorail vehicle, and relates to the arrangement and structure of a sound absorbing device for reducing noise in the wheel compartment.

Conventionally, the most common way to reduce noise in railway vehicles is to shield the area around the noise source and apply sound-absorbing treatment to the inner surface of the noise source.In order to improve the sound-absorbing effect, the sound-absorbing material protection plate has been made into a serrated or bellows-like shape. However, these sound absorption treatment methods are just a combination of general methods, and cannot be said to be specific sound absorption measures for the bogie sound source. The drawback was that the sound absorption coefficient within the area was relatively small.

An object of the present invention is to provide a low-noise wheel chamber for a monorail vehicle that can efficiently reduce drive wheel noise, reducer noise, and main motor noise.

In general, noise from monorail bogies with rubber tires is dominated by drive wheel noise due to factors such as drive adhesion and the number of drive wheels, and exceeds the noise level of other reduction gears and main motors. The present invention diffracts the sound generated by the drive wheels to the upper side of the track girder to reduce the level. Therefore, the sound absorption effect at the upper part of the wheel chamber is increased by reflecting the rolling sound on the drive wheel tread surface. A partition plate is provided to reduce the main noise level in the wheel compartment above the partition plate.

In order to reduce the sound by sound absorption, the upper part of the drive wheel and the end wall are made of a bellows-shaped multi-layer sound-absorbing wall, and a single layer is placed behind the sound-absorbing wall on the end wall leading to the opening at a certain distance from the sound-absorbing wall. A sound-absorbing wall is installed to create a structure that is highly effective in absorbing low-frequency sound, and a sound-absorbing cover is attached to the end wall on the opposite side to cover the top surface of the girder to reduce the noise level reaching the opening. . In addition, the sound-absorbing treatment on the back of the lower skirt located at the bottom of the partition plate absorbs relatively low-level sounds such as diffracted and transmitted sound from the partition plate surface, noise generated by current collectors, guides, and stabilizing wheels. from,
A single-layer sound-absorbing wall is used to surround the sound source of the trolley and perform sound-absorbing treatment.
The unique feature is that sound-absorbing chambers are provided in each step, and the sound-absorbing layer is changed depending on the noise level.

An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the figure, 1 is a track girder, and 2 is a driving wheel tread. Reference numeral 3 denotes a bogie that straddles the track girder 1 and is composed of a drive wheel 4 rotating via a main motor 5 and a speed reducer 6, a guide wheel 7, a stabilizing wheel 8, a current collector 9, an auxiliary wheel 10, etc. . Reference numeral 11 denotes a lower skirt provided at a position surrounding the lower surface of the wheel well, and a single-layer sound absorbing wall 13 is provided on the back surface. Reference numeral 12 denotes an inspection lid on the side, and a bellows-type multilayer sound-absorbing wall 14 is provided. Reference numeral 15 denotes a ceiling sound absorbing wall, 16 a multilayer sound absorbing section, and 17a and 17b a gable multilayer sound absorbing wall, each of which has a sound board 18. 19 is a single-layer sound absorbing wall, and 20 is a sound absorbing cover. Reference numeral 21 denotes a wheel chamber, which is horizontally divided into an upper wheel chamber 22 and a lower wheel chamber 23 by a partition plate 30 with a sound-absorbing layer, has openings 24 and 25, and has a ceiling surrounded by a floor plate 29. The partition plate 30 is disposed at a lower position near the driving wheel tread surface, corresponding to the lower part of the driving wheel 4, the main electric motor 5, and the reduction gear 6, over almost the entire length of the bogie in the longitudinal direction.

FIG. 4 shows the structure of a multilayer sound absorbing wall, in which 26 is a perforated plate, 27 is a sound absorbing material, and 28 is an air layer.

In the above configuration, the rolling noise of the drive wheels 4 having a high noise level is transmitted to the ceiling surface of the wheel chamber 22, the ceiling sound absorbing wall 15 provided on the side surface of the gable surface, the multilayer sound absorbing section 16, and the multilayer sound absorbing section 16 on the gable surface. The layered sound-absorbing walls 17a, 17b and the partition plate 30 have a high sound-absorbing efficiency due to the reflection effect, and the sound-absorbing plate 19 provided on the back side of the multi-layered sound-absorbing wall 17a prevents the sound from coming from the opening 25. The noise of low frequency components is particularly reduced with respect to diffracted sound and transmitted sound from the multilayer sound absorbing wall 17a. moreover,
A sound absorbing cover 20 having a shape that wraps around the track girder 1 is provided on the lower surface of the multilayer sound absorbing wall 17b in order to absorb the rolling noise of the driving wheels 4 reflected from the driving wheel tread 2, resulting in a configuration with high sound absorbing efficiency. It's summery. In contrast,
Noise processing in the lower wheel chamber 23 bordering on the partition plate 30 is performed to ensure a relatively low noise level, such as diffraction, transmitted sound and guidance from the upper wheel chamber 22, and noise generated by the stabilizing wheels 7, 8 and the current collector 9. The purpose of reducing sound is achieved by using the single layer sound absorbing wall 13.

Furthermore, to explain the specific value of monorail bogie noise and its sound absorption effect, the reduction gear 6, which is a noise source other than the drive wheels 4, is By installing separate ducts and fans, and by using high-precision bearings, the current collector 9 is able to reduce the noise level of each sound source compared to the specified value due to the elastic support of the shoes, etc. However, the drive wheels 4, which are made of rubber tires, , an approximate lug formation pattern is required due to the adhesion properties to steel girders during rain, and the noise value on the kick-off side relative to the tread-in side in the rotational direction, which is unique to rubber tires, is higher around the tread than in the outer diameter direction of the tire. It is difficult to reduce noise. In addition, in terms of noise characteristics, both low-frequency components and high-frequency components with peak levels have frequency values, so sound absorption cannot be achieved with single-layer sound absorption treatment alone. In this regard, high-frequency components at peak levels are absorbed by the multi-layer sound absorbing walls 17a and 17b on the gable side and the multi-layer sound absorbing section 16 constructed near the corner of the ceiling sound absorbing wall 15 shown in FIG. In addition, the partition plate 30 that reflects rolling noise is also subjected to sound absorption treatment, and the laminated sound absorption wall 1 is also applied to absorb standing waves or low frequency components.
A single-layer sound absorbing mold 19 is placed on the back side of the roller 7a to absorb rolling noise.

According to the present invention, the monorail vehicle The noise of the drive system, which is the main source of noise, can be efficiently reduced without propagating it to the outside, and the noise of the monorail vehicle can be effectively reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a low-noise wheel chamber of a monorail vehicle according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a view taken from direction B in FIG. The perspective view, FIG. 4, is a sectional view of the multilayer sound absorbing wall. 11...Lower skirt, 12...Inspection lid, 13
...Single-layer sound-absorbing wall, 14...Multi-layer sound-absorbing wall, 15...
Ceiling surface sound absorption wall, 16...Multilayer sound absorption part, 17a, 1
7b...Multi-layer sound absorption wall, 18...Shiya sound board, 19...
...Sound absorbing wall, 20...Sound absorbing cover, 22...Upper wheel chamber, 23...Lower wheel chamber, 24, 25...
Opening, 26...Perforated plate, 27...Sound absorbing material, 2
8...air layer, 30...partition plate.

Claims (1)

[Claims] 1. A bogie configured to straddle track girders,
In the low-noise wheel chamber of a monorail vehicle, which is formed by covering the outer periphery with a skirt formed integrally with the vehicle body, the lower part near the drive wheel tread corresponds to the drive wheel, reducer, and main motor of the bogie. The ceiling surface, side surfaces, and The partition plate is composed of both ends and a lower skirt with a single-layer sound-absorbing wall formed inside;
A low-noise wheel chamber for a monorail vehicle, characterized in that an upper wheel chamber is formed by a ceiling surface, side surfaces, and both ends, and a lower wheel chamber is formed by the partition plate and the lower skirt. 2. The low-noise wheel chamber of a monorail vehicle according to claim 1, characterized in that a sound-absorbing wall is provided at a predetermined distance between one end of the end and the back surface of the sound-absorbing wall. . 3. The low-noise wheel chamber for a monorail vehicle according to claim 2, characterized in that the other end of the gable is provided with a sound-absorbing cover that wraps around a track girder at the bottom of the sound-absorbing wall. 4. The low-noise wheel chamber of a monorail vehicle according to claim 1, characterized in that the multilayer sound-absorbing wall is of a bellows type.