JPS5861062A - Low noise wheel chamber of monorail car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-noise wheel compartment of a Morrail 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 efficiently absorb the noise peculiar to a mole rail bogie in a wheel chamber of a certain volume, thereby reducing the sound radiated from the skirt opening.

Generally, the noise of a mole rail truck with rubber tires is
Drive wheel noise is dominant due to 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.

- Also, the sound reduction effect through sound absorption is achieved by using a bellows-type multi-layer sound absorbing wall on the upper part of the drive wheel and the end wall, and installing a single layer on the back of the sound absorbing wall on the end wall leading to the opening at a certain distance from the sound absorbing wall. A layered sound absorbing wall is installed to create a structure that is highly effective in absorbing low-frequency sound, and a sound absorbing cover is placed on the end wall on the opposite side to cover the top of the girder to reduce the noise level reaching the opening. be. 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. As a single layer sound absorbing wall,
In the structure in which the sound source circumference P of the trolley is surrounded and subjected to sound absorption treatment, sound absorption chambers are provided in upper and lower levels with a partition plate attached to the trolley as a boundary, and the sound absorption layer is changed depending on the noise level.

An embodiment of the present invention will be explained with reference to FIGS. 1 to 4. In the figure, 1 is a track girder, and 2 is a driving wheel tread.

3 is a bogie that straddles the track girder 1, and has drive wheels 4 and guide wheels 7 that rotate via a main motor 5 and a reduction gear 6. Stable axis8. Current collector9. It is composed of auxiliary wheels 10 and the like.

Reference numeral 11 is a lower skirt provided at a position surrounding the lower surface of the wheel draft, and a single-layer sound-absorbing wall 13 is provided on the back side.012 is an inspection lid on the side, and a bellows-type multi-layer sound-absorbing wall 14 is provided. There is. 15 is a ceiling sound absorption wall, 16 is a multilayer sound absorption section, 1
7a.

+7 b is a multilayer sound absorption wall on the gable side, each with 18 sound plates.
has. ] 9 is a single-layer sound-absorbing wall, and 021 is a sound-absorbing cover. 021 is a wheel well, which is horizontally divided into an upper wheel well, a lower wheel well between partition plates made of sound-absorbing material, and an opening part.
25, and the ceiling is surrounded by floorboards.

FIG. 4 shows the structure of a multilayer sound-absorbing wall, where % is a perforated plate, γ is a sound-absorbing material, and rows are air layers.

In the configuration described above, the rolling noise of the drive wheels 4, which has a high noise level, is transmitted through the sound absorbing wall 15. The multi-layer sound absorbing section 16° is configured to have high sound absorption efficiency due to the reflection effect between the multi-layer sound absorbing walls 17a and 17b on the end face and the partition plate (material), and is also provided on the back side of the multi-layer sound absorbing wall 17a. The sound-absorbing plate 19 reduces noise, especially low frequency components, of the diffracted sound from the opening δ and the transmitted sound from the multilayer sound-absorbing wall 17a. Further, on the lower surface of the multi-layer sound absorbing wall 17b, a sound absorbing cover is provided which is shaped to wrap around the track girder l in order to absorb the rolling noise of the drive wheels 4 reflected from the drive wheel tread 2, thereby increasing the sound absorption efficiency. It has a high composition. On the other hand, noise in the lower wheel chamber Z bordered by the partition plate is processed by diffraction from the upper wheel chamber N.

This is achieved by using the single-layer sound absorbing wall 13 for the purpose of attenuating relatively low-level sounds such as transmitted sound and sound generated by the guide, stabilizing wheels 7, 8, and current collector 9.

Furthermore, to explain the characteristic value of mole rail bogie noise and its sound absorption effect, the reduction gear 6, which is a noise source other than the drive wheels 4, is By placing the fan separately and using high-precision bearings, the current collector 9 can reduce the noise of each sound source compared to the specified value due to the elastic support of the shoe. 4 requires an approximate lug type pattern due to the adhesion characteristics to steel girders during rain or when the noise value on the tread exit side relative to the treading side in the rotational direction peculiar to rubber tires is The situation is such that 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 view of this, high-frequency components at peak levels are absorbed by the double-layer sound-absorbing walls 17a and 17b shown in FIG. In addition, the partition plates (materials) that reflect rolling noise are also subjected to sound-absorbing treatment, and a single-layer stem-type sound-absorbing type is installed on the back of the multi-layer sound-absorbing wall 17a to absorb standing waves or low-frequency components. 19 is arranged to perform sound absorption processing of driving sound.

According to the present invention, in order to deal with the noise peculiar to the wheel compartment, a partition plate that divides the wheel compartment into an upper and lower part and a peak level are set to absorb the diffracted sound radiated to the opening and the direct radiated sound of the sound source at a low level. It has the effect of absorbing sound with the walls and reducing the sound radiated from the openings with an efficient sound absorption treatment structure.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of a low-noise wheel chamber of a mole rail 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. 1. The perspective view, FIG. 4, is a cross-sectional view of a 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...
・Multi-layer sound-absorbing section, 17a, 17b...Multi-layer sound-absorbing wall, 18...Sound-proof plate, 19...Sound-absorbing wall, addition...Sound-absorbing cover , n... Upper wheel chamber, illusion... Lower wheel chamber, Sae, 25...
・Opening, part...Perforated plate, 4...Sound absorbing material, A...Air layer, (Investment)...Partition plate Agent Patent attorney Usui 1) Kosai Toshi 1 illustration

Claims (1)

[Scope of Claims] 1. In the wheel chamber of a bogie that is configured to straddle the track girders, a partition plate made of a sound-absorbing layer material is provided over almost the entire length of the lower part near the drive wheel tread to divide the wheel chamber into upper and lower parts. A low-noise wheel compartment for a mole rail vehicle, characterized in that multi-layer sound-absorbing walls are provided on the ceiling, side and inner gable walls, and a single-layer sound-absorbing wall is attached to the back of the lower skirt of the lower wheel compartment. 2. A low-noise wheel chamber for a mole rail vehicle according to claim 1, in which a sound-absorbing wall is provided on the back side of the sound-absorbing wall on the end wall. 3. A low-noise wheel chamber for a mole rail vehicle according to claim 1 or 2, in which a sound-absorbing cover that wraps around a track girder is attached to the lower part of the sound-absorbing wall on the end wall. 4. The low-noise wheel chamber of a Morrail vehicle according to claim 1, in which the multilayer sound-absorbing wall is bellows-shaped.