JP2004291893A - Damping device of rolling stock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling stock damping device capable of reducing the noise level in a cabin by suppressing the oscillation of a rotary member such as a compressor provided underfloor of a rolling stock. <P>SOLUTION: A damping device 22 to reduce the vehicle vibration by suppressing the oscillation of a compressor 20 which is one of underfloor rotary members as an oscillation source of a rolling stock includes a housing 24 as a rigid abutting part integrally displaced with an oscillation part of the compressor 20, a mass member 36 which is provided in a freely movable manner in the oscillating direction with respect to the housing 24, a space which is formed between the housing 24 and the mass member 36 to freely move the mass member 36 in the oscillating direction, and an elastic body formed on at least one of abutting surfaces of the housing 24 and the mass member 36. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for reducing vibration of a railway vehicle, and in particular, for reducing noise in a passenger compartment due to the vibration.
[0002]
Problems to be solved by the prior art and the invention
2. Description of the Related Art A rolling member such as a compressor for a brake, an air spring and the like is mounted on a railway vehicle under a floor of a passenger compartment.
The underfloor rotating member is elastically supported by vibration isolating rubber, but the vibration isolating rubber alone does not provide sufficient vibration insulation, and the vibration generated by the underfloor rotating member is transmitted to the floor of the passenger compartment, and the vibration is further transmitted to the floor. From the vehicle to the side wall and ceiling, causing the entire cabin to vibrate, generating noise in the cabin.
[0003]
As a countermeasure, it is conceivable to attach a dynamic damper to the underfloor rotating member and dampen it, but in this case, there is a problem that the mass weight of the dynamic damper becomes too heavy in order to exert a damping effect.
[0004]
The cause of noise in the cabin is the vibration of the underfloor rotating member itself, and the pipe extending from the underfloor rotating member vibrates, and the vibration of the pipe propagates from the floor to the cabin through the pipe support member. There is a problem that needs to be solved.
[0005]
2. Description of the Related Art Conventionally, as a damping device for a railway vehicle, a damping device in which a granular material is stored inside a container is attached to a towing link (Patent Documents 1 and 2 below), and a similar damping device is attached to a bogie frame. (Patent Document 3 below), a large number of granular materials sealed in a hollow portion of an axle, or a large number of granular materials sealed in a container are attached to a wheel so that the axle and the wheel are respectively damped. (Patent Document 4 below) and the like have been proposed, but those that focus on the underfloor rotating member and suppress the vibration of the underfloor rotating member or the vibration of the pipe connected to the underfloor rotating member to reduce the vehicle vibration are still described. Not provided.
[0006]
[Patent Document 1]
JP 2001-158349 A [Patent Document 2]
JP 2001-219848 A [Patent Document 3]
JP 2001-199334 A [Patent Document 4]
JP 2001-233003 A
[Means for Solving the Problems]
The railway vehicle vibration damping device of the present invention has been devised to solve such a problem.
An apparatus for reducing vehicle vibration by suppressing vibration of an underfloor rotating member which is a vibration source of a railway vehicle, wherein the rigidity is integrally displaced with a vibrating portion of the underfloor rotating member. A contact member, a mass member provided in a floating state in the vibration direction with respect to the corresponding portion and colliding with the corresponding portion during vibration, and the mass member formed between the relevant portion and the mass member, And a resilient member formed on at least one of the contact surfaces of the contact portion and the mass member.
[0008]
According to a second aspect of the present invention, in the first aspect, a housing formed separately from the underfloor rotating member is provided as the rigid contact portion, and the mass member is accommodated in a floating state in a floating chamber of the housing. It is characterized by having been done.
[0009]
An apparatus for reducing vehicle vibration by suppressing vibration of a pipe or a pipe support member extending from an underfloor rotating member that is a vibration source of a railway vehicle, wherein the pipe or the pipe support member is provided. A contact portion of rigidity that is integrally displaced with the mass member, a mass member provided in a floating state in the vibration direction with respect to the corresponding portion and colliding with the corresponding portion during vibration, and a mass member formed between the corresponding portion and the mass member. It is characterized by having a gap for allowing the mass member to float in the vibration direction, and an elastic body formed on at least one of the contact surfaces of the contact portion and the mass member.
[0010]
According to a fourth aspect of the present invention, in the third aspect, a housing formed separately from the pipe or the pipe supporting member is provided as the rigid contact portion, and the mass member is in a floating state in a floating chamber of the housing. It is characterized by being housed in.
[0011]
[Action and effect of the invention]
As described above, the invention of claim 1 is provided with a rigid contact portion that is integrally displaced with the vibration portion of the underfloor rotating member, which is a vibration source of a railway vehicle, and is provided in a free state in the vibration direction with respect to the contact portion. A vibration damping device having a mass member, a gap formed therebetween, and an elastic body interposed between the hitting portion and the mass member is mounted on the underfloor rotating member. Is suppressed.
[0012]
This damping device works as follows.
That is, in the case of this vibration damping device, when the underfloor rotating member starts to vibrate, the contact portion integral with the vibrating portion is displaced and starts to vibrate in synchronization with the displacement.
On the other hand, since the mass member is in a floating state in the vibration direction with respect to the contact portion, that is, freely moves in the same direction independently of the contact portion, it collides with the contact portion when the contact portion vibrates, and It acts to cancel the vibration, that is, the vibration of the rotating member under the floor.
[0013]
At this time, the mass member colliding with the hit portion is given kinetic energy in the opposite direction from the hit portion (accordingly, a part of the vibration energy of the hit portion is absorbed as the kinetic energy of the mass member), and the mass member moves in the opposite direction. Exercise.
Then, it again collides with the contact surface at the position opposite to the first contact surface and acts again to cancel the vibration of the contact portion, that is, the vibration of the underfloor rotating member.
[0014]
After that, the mass member repeats the same motion in a phase opposite to or different from that of the hit portion, absorbs the vibration energy of the hit portion at each collision, and vibrates by converting this into its own kinetic energy. Continue to hit the hit section. Thereby, the vibration energy of the underfloor rotating member is absorbed, the vibration is attenuated, and the vibration is effectively damped.
[0015]
If both the contact portion and the mass member are made of a rigid body, a loud noise (collision sound) is generated at the time of collision.
However, in the vibration damping device according to the present invention, since an elastic body such as rubber or resin is formed on at least one of the contact surfaces of the contact portion and the mass member, there is no problem that a loud noise is generated at the time of collision, Vibration energy is converted and absorbed into heat by the sliding friction at the time and the viscous behavior of the elastic body, that is, the vibration damping action of the elastic body works to promote vibration damping of the underfloor rotating member.
[0016]
The effect when the dynamic damper is attached to the underfloor rotating member is as follows.
This dynamic damper adds a damper mass to a vibrating portion (under-floor rotating member) via a spring. The dynamic frequency of the additional vibration system including the damper mass and the spring is changed by the natural frequency (vibration) of the main vibration system. By tuning to the natural frequency of the vibrating part, the resonance magnification of the vibrating part can be reduced and vibration can be suppressed.
[0017]
However, the vibration damping by the dynamic damper only exerts an effect on vibration of a single resonance frequency, and cannot effectively prevent resonance of another frequency. That is, it is not effective for resonance at a plurality of frequencies.
Moreover, in the case of the dynamic damper, there is a problem that another resonance is newly generated before and after the resonance point.
In addition, when a rubber elastic body is used as a spring, the spring constant of the rubber elastic body changes with temperature, so that the temperature dependence of the vibration damping characteristics is high, and the vibration damping efficiency decreases at high or low temperatures.
[0018]
Furthermore, the dynamic damper requires a large mass as the damper mass (about 10% of the mass of the vibrating member (rotary member under the floor)), which increases the weight of the entire apparatus and the required installation space, and furthermore, There are various problems, such as the direction in which the vibration can be damped, which does not work effectively in multidirectional vibrations.
[0019]
However, in the vibration damping device of the present invention, the mass member is provided so as to be independently movable, and the mass member is moved in a phase opposite to or different from the vibration portion of the underfloor rotating member to be damped, so that the mass member collides with the hitting portion. Since it absorbs and attenuates vibration energy, there is no particular frequency dependence, vibration can be suppressed over a wide frequency range, and it is easy and simple to take collision directions in multiple directions. Vibration in the direction can be suppressed, and the dependency on temperature is small, and a good vibration damping effect is exhibited in a wide temperature range from high temperature to low temperature.
Also, the mass required for the mass member is light (sufficient about 5% of the mass of the underfloor rotating member), the space required for the entire apparatus is small and compact, and it can be easily mounted on the underfloor rotating member. Has features.
[0020]
FIG. 1A schematically shows an embodiment of the vibration damping device according to the present invention in comparison with a dynamic damper. In the drawing, reference numeral 1 denotes the vibration damping device, and reference numeral 2 denotes a dynamic damper. .
Reference numeral 3 denotes a mass member in the vibration damping device 1, 4 denotes an elastic body formed on the outer peripheral surface of the mass member 3, that is, a contact surface, 5 denotes a housing forming a contact portion, and 6 denotes a damper mass in the dynamic damper 2. , 7 indicate a spring (rubber), and 8 indicates a vibration member (rotary member under the floor).
[0021]
FIG. 1B shows the vibration damping effect when the vibration damping device 1 is mounted on the vibration member 8 in comparison with the case where the dynamic damper 2 is mounted and the case where they are not mounted.
However, in FIG. 1B, c shows a case where the vibration damping device 1 is mounted, b shows a case where the dynamic damper 2 is mounted, and a shows a case where neither of them is mounted.
[0022]
As can be seen from the vibration damping characteristics shown in FIG. 1B, when the dynamic damper 2 shown in FIGS. 1A and 1B is mounted, resonance is suppressed in a specific frequency region (here, a region on the high frequency side). Although it is possible, another new resonance is generated before and after the resonance point, and there is no effect on the resonance on the lower frequency side, but the vibration damping device 1 of FIGS. In this case, the effect is exhibited on both the high frequency side and the low frequency side, and the phenomenon that another new resonance occurs before and after the resonance point does not occur.
[0023]
As is clear from the above, by mounting the vibration damping device according to the present invention on the underfloor rotating member of the railway vehicle, the vibration of the underfloor rotating member can be favorably suppressed, and the vibration transmitted to the passenger compartment can be effectively suppressed.
As a result, the noise level in the passenger compartment can be reduced, and the riding comfort can be improved.
[0024]
In the present invention, the rigid contact portion can be made of a metal such as iron or aluminum alloy, a hard resin, or another hard material.
The mass member itself can be formed of an elastic body such as rubber or resin. However, in this case, it is desirable to form a high specific gravity rubber, a high specific gravity resin, or the like in which metal powder or the like is mixed therein. When the mass member is formed of an elastic body such as rubber or resin, the mass member itself forms an elastic body such as rubber or resin formed on at least one contact surface between the rigid contact portion and the mass member. It is possible to configure.
The mass member may be formed as an elastic foam such as rubber or resin.
However, for more effective vibration suppression, it is desirable that the mass member be made of a metal such as iron, aluminum alloy, or lead. In that case, an elastic body such as rubber or resin is formed on at least one of the contact surfaces of the rigid contact portion and the mass member.
[0025]
In the present invention, the gap has an important meaning in causing the mass member to most effectively collide with the contact portion. In this sense, the gap is preferably formed in a range of 0.05 to 2.0 mm. Desirably, it is in the range of 0.2 to 1.0 mm.
[0026]
In the present invention, rubber and resin can be used as the elastic body.
Here, as the rubber, for example, various rubbers such as diene rubbers such as NR, SBR and BR, EPDM rubbers, urethane rubbers and silicone rubbers can be used.
As the resin, for example, a thermoplastic resin such as polypropylene or polyamide, a polyolefin, urethane, a polyester-based thermoplastic elastomer or the like can be used.
[0027]
Here, the elastic body may be bonded and fixed to the contact surface of the mass member or the contact portion by vulcanization or the like, or may be formed on the contact surface in a non-adhered state.
[0028]
In the present invention, the rigid contact portion of the vibration damping device may be constituted by using a part of the underfloor rotating member as it is, or a housing separate from the underfloor rotating member may be provided and formed as a contact portion. Further, the vibration damping device may be configured such that the mass member is accommodated in a floating state in the floating chamber of the housing (claim 2).
In this way, the vibration damping device can be easily mounted on the underfloor rotating member.
[0029]
Vibrations transmitted to the cabin of the railway vehicle include vibrations from the underfloor rotating members themselves and vibrations from pipes extending from the underfloor rotating members.
[0030]
Here, claim 3 attaches a vibration damping device having a configuration similar to the above to the pipe or the pipe support member, thereby suppressing vibration of the pipe itself or the pipe support member. is there.
Even in such a case, the noise in the vehicle compartment can be effectively reduced, and the riding comfort can be improved.
[0031]
Further, when the vibration of the pipe or the pipe supporting member is suppressed by the vibration damping device in this way, a housing formed separately from the pipe or the pipe supporting member is provided as a rigid contact portion of the vibration damping device. The vibration damping device can be configured in such a manner that the mass member is accommodated in a floating state in the room (claim 4).
[0032]
【Example】
Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 2, reference numeral 10 denotes a railway vehicle, and a floor panel 12, side wall panels 14, and a ceiling panel 16 form a passenger compartment 18 inside.
Reference numeral 20 denotes a compressor (air compressor) provided under the floor, which is one of the underfloor rotating members, and is suspended under the floor by vibration-proof rubber (not shown).
As shown in FIG. 3, the compressor 20 is provided with the vibration damping device 22 of the present example.
[0033]
FIG. 4 specifically shows the configuration of the vibration damping device 22.
In FIG. 4, reference numeral 24 denotes a rigid housing made of metal, which is formed separately from the compressor 20. The housing main body 26 has an open lower surface in FIG. 4A, and a mounting plate 28 for closing the lower surface. And these are fastened by bolts 30.
[0034]
A floating chamber 34 having a quadrangular cross-sectional shape, a vertical cross-sectional shape, and a horizontal cross-sectional shape is formed inside the housing 24, and a metal mass member 36 having a shape corresponding to the floating chamber 34 is formed of rubber. It is movably accommodated in a state covered with an elastic body 38 such as. That is, the mass member 36 whose outer peripheral surface is covered with the elastic body 38 is movably accommodated in the floating chamber 34 through the gaps S and 2S.
It should be noted that projections 40 are formed at a plurality of locations on the elastic body 38, and at these projections 40, the mass member 36 comes into contact with the housing 24 via the elastic body 38.
[0035]
The mounting plate 28 forming a part of the housing 24 is provided with a mounting hole 32, and the vibration damping device 22 is mounted and fixed to the compressor 20 in the mounting hole 32.
[0036]
In the case of the vibration damping device 22 of the present example, when the compressor 20 starts to vibrate, the mass member 36 collides with the housing 24 as a rigid contact portion that vibrates integrally with the compressor 20, and the vibration of the housing 24, that is, the vibration of the compressor 20 Acts to cancel.
At this time, kinetic energy is applied to the mass member 36 in the opposite direction from the housing 24, that is, the vibrating portion of the compressor 20, and the mass member 36 moves in the opposite direction. Then, it again collides with a contact surface located at a position opposite to the first contact surface and acts so as to cancel the vibration of the compressor 20.
[0037]
The mass member 36 repeats the same movement in the opposite phase or a different phase from the vibration part of the housing 24, that is, the vibration part of the compressor 20, and absorbs the vibration energy of the compressor 20 every time a collision occurs. Convert to energy.
As a result, the vibration energy of the compressor 20 is attenuated due to the energy absorption by the sliding friction at that time, and the vibration is effectively damped.
[0038]
Unlike the dynamic damper, the vibration damping device 22 of this example has no particular frequency dependency, can suppress vibration over a wide frequency range, has a small temperature dependency, and has a wide temperature range from high temperature to low temperature. Demonstrate good damping effect.
Further, since the required mass of the mass member 36 is light and sufficient, the required space of the whole vibration damping device 22 is small and compact, and therefore, the vibration damping device 22 can be easily mounted on the compressor 20 even in a narrow limited installation space.
Thus, since the vibration of the compressor 20 can be effectively suppressed in this manner, the transmission of the vibration from the compressor 20 to the vehicle interior 18 is reduced, the noise in the vehicle interior 18 is reduced, and the riding comfort is improved. I can do it.
[0039]
FIG. 5 shows an example in which a vibration damping device is attached to a piping system extending from the compressor 20.
In the figure, reference numeral 42 denotes a flexible air pipe (hereinafter, simply referred to as a pipe) extending from the compressor 20, and is supported by a frame 44 via a holding member 46.
In this embodiment, the holding member 46 and the frame 44 constitute a pipe support member.
[0040]
Reference numeral 48 denotes a vibration damper, which is attached to the holding member 46 via an attachment member 50.
The vibration damping device 48 of this example has a rigid housing 24 made of metal, and the housing 24 is fixed to a mounting member 50.
The housing 24 has two cylindrical floating chambers 34, each of which has a cylindrical mass member 36, which is also cylindrical and has an outer peripheral surface covered with an elastic body 38 through gaps S and 2S. It is housed in a floating state.
[0041]
By attaching the vibration damping device 48 according to this example, even if the vibration from the pipe 42 connected to the compressor 20 is transmitted to the pipe support member, specifically, the holding member 46 and the frame 44, those vibrations are transmitted by the vibration damping device 48. It is possible to effectively suppress the vibration from being transmitted to the cabin 18 of the railway vehicle and to generate loud noise in the cabin 18.
[0042]
Here, the vibration suppression device 48 is attached to the pipe support member to suppress the vibration. However, the vibration suppression device 48 shown in FIG. Of course, it is also possible to suppress the vibration of the vehicle. In this case as well, the effect of reducing the noise in the passenger compartment 18 due to the vibration of the pipe 42 can be obtained.
[0043]
Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention can be configured in various other forms other than the above examples. It can be configured in a form in which various changes are made in the range.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram conceptually showing one embodiment of a vibration damping device of the present invention in comparison with one embodiment of a conventional dynamic damper.
FIG. 2 is a diagram showing a compressor to which the vibration damping device of the present invention is mounted together with a passenger compartment of a railway vehicle.
FIG. 3 is a diagram showing a vibration damping device according to an embodiment of the present invention mounted on a compressor.
FIG. 4 is a diagram showing a specific configuration of the vibration damping device of the embodiment.
FIG. 5 is a diagram of another embodiment of the present invention.
[Explanation of symbols]
10 Railway vehicle 20 Compressor (rotary member under floor)
22, 48 Vibration suppression device 24 Housing (contact part)
34 Idling chamber 36 Mass member 38 Elastic body 42 Piping 44 Frame (Piping support member)
46 Holding member (Piping support member)
S, 2S gap

Claims (4)

An apparatus for reducing vehicle vibration by suppressing vibration of a rotating member under the floor, which is a vibration source of a railway vehicle,
A contact portion of rigidity that is displaced integrally with the vibrating portion of the underfloor rotating member; a mass member provided in a floating state in a vibration direction with respect to the corresponding portion and colliding with the corresponding portion at the time of vibration; And a gap for allowing the mass member to float in the vibration direction, and an elastic body formed on at least one contact surface of the contact portion and the mass member. Railway vehicle vibration damper. 2. The device according to claim 1, further comprising a housing formed separately from the underfloor rotating member as the rigid contact portion, wherein the mass member is accommodated in a floating state in a floating chamber of the housing. 3. Railway vehicle vibration damper. An apparatus for reducing vehicle vibration by suppressing the vibration of a pipe or a pipe support member extending from an underfloor rotating member that is a vibration source of a railway vehicle,
A contact portion of rigidity that is integrally displaced with the pipe or the pipe support member, a mass member provided in a floating state in a vibration direction with respect to the corresponding portion and colliding with the corresponding portion at the time of vibration, and a corresponding portion and the mass member And a gap formed between the mass member and the elastic member formed on at least one of the contact surfaces of the contact portion and the mass member. Railcar damping device. In Claim 3, it has a housing constituted separately from the pipe or the pipe support member as the rigid contact portion, and the mass member is accommodated in a floating state in a floating chamber of the housing. Characteristic vibration damping device for railway vehicles.

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