JPH11201208A - Vibration-isolating tie pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-isolating tie pad having an excellent vibration isolating capability by forming the pad out of compression boards and a rubber pad sandwiched integrally between them to ensure an excellent vibration isolation by controlling a sharp repulsive force at the time of acceleration vibration to ensure a sufficient vibration damping, and by utilizing an anti-shear elasticity of rubber to ensure a damping effect. SOLUTION: An upper compression board 1 and a lower compression board 2, each having a plurality of protrusions on one side, a plurality of through holes 5, a sandwiching guide 6 at one corner of the board and a notch 7 at another corner of the board, are fabricated so that the two boards 1, 2 are fitted to each other. A vibration isolating rubber 3 is interposed and held between the two compression boards 1, 2. The upper compression board 1 and the lower compression board 2 are made of synthetic resins boards, or resin board in which metal powder or minerals substance is evenly mixed and in synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration tie pad for a rail fastening device in a railway track.

[0002]

2. Description of the Related Art In general, vibration isolating pads for railway track rails are:
Rail height is limited for security reasons. Therefore, a rubber plate is used because the vibration-proof pad is desired to be thin and has a vibration-proof effect. However, there is a problem that the elasticity of the rubber plate becomes uneven. In other words, the vibration-proof rubber plate has a problem that the elasticity near the outer periphery works well (the spring K is low), but the elasticity at the center portion is poor (the spring K is high and hard). This is because there is no place for rubber to escape at the time of compression, and for that purpose, multiple narrow grooves are formed on the upper and lower surfaces of the plate,
There are track pads that provide a place for rubber to escape. However, in the rubber plate installed under the track rail, the vibration energy pressure accompanying heavy load during traveling of the vehicle extends not only in the vertical direction but also in the traveling direction. Therefore, the rubber plate is extruded in the traveling direction, and abrasion occurs on the surface. In order to prevent this, a metal plate is bonded to the surface of the rubber plate. However, if the metal plate is bonded to the rubber plate, the rubber elasticity is impeded (the spring K is high and hard), which is also a problem. By the way, the applicant has already invented an anti-vibration pad exhibiting an excellent anti-vibration effect (Japanese Patent Application No. 8-143).
No. 25) Although this vibration-proof pad works very well in the horizontal direction, that is, in the left-right and front-rear directions, a problem occurs when the vertical amplitude of the rail becomes large. This may cause a heavy load on the rail due to the running of the vehicle and induce a resonance phenomenon when the rail vibrates, causing the rail to move up and down greatly. At this time, a part of the lower compression plate 2 may protrude from the metal cover to impair the anti-vibration function or may be damaged. In addition, when the rail is mounted on the tie plate for fastening the track, there is a problem that the rail may be mounted in a state where the lower compression plate is partly protruded from the cover. As shown in FIG. 5, the anti-vibration tie pad 14 is set on the variable pad 13, the rail 9 is placed thereon, and the rail holding spring 11 is tightened with the tightening screw 10 and fixed. is there. Therefore, if the rails generate heavy vibrations due to the running of the vehicle, the rails will slide back and forth on the tie pads installed to vibrate up and down greatly. The board protrudes from the cover, and the above-described defect occurs.

[0003]

In order to achieve the above object, a vibration isolating pad according to the first aspect of the present invention has an upper compression plate provided with a through hole, a projection, a tying guide, a cutout on one surface, and an upper compression plate on one surface. An anti-vibration rubber in which a vibration isolating rubber is interposed between a projection, a through hole, a tying guide, and a lower compression plate provided at a position where the notch portion is fitted to the upper compression plate, and ties the vibration isolating rubber by the guide. The vertical compression plate is characterized in that it is a synthetic resin plate or a resin plate formed by mixing a metal powder or an inorganic substance into a synthetic resin and uniformly dispersing it.
According to a second aspect of the present invention, there is provided an anti-vibration pad configured by attaching a metal cover to the anti-vibration pad according to the first aspect. Here, the synthetic resin plate corresponds to, for example, a polyamide resin, a polyimide, a polyester resin, ABS, or the like. Also, a resin plate formed by mixing a metal powder or an inorganic substance into a synthetic resin and uniformly dispersing the resin plate is, for example, an interference damping material described in JP-A-50-13976, which is preferable.

[0004]

When the anti-vibration pad bends under load, the projection provided on one of the compression plates compresses the anti-vibration rubber, and a part of the anti-vibration rubber is pressed into the through hole of the other compression plate. You. Then, when the load is reduced, a part of the press-fitted anti-vibration rubber escapes from the through-hole and is restored. Therefore, a sudden repulsive force is suppressed, and a damping force works to obtain effective vibration isolation. In particular, when the vibration-proof rubber is pressed into the through-hole formed in the compression plate by the projection, the effect of the shear force of the rubber and the vibration-proof force due to the synergistic effect with the damping force are extremely strong.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following embodiments. FIGS. 1 and 2 schematically show an anti-vibration pad according to an embodiment of the present invention. The anti-vibration pad is shown in an assembled state, an uncompressed state diagram 2 (b), and a compressed state diagram 2 (c), respectively. Is shown. As shown in the figure, the vibration isolating pad is integrally formed by tying guides 6 and 6 'provided on the upper and lower compression plates with an anti-vibration rubber plate 3 interposed between the upper compression plate 1 and the lower compression plate 2. Is formed.

As shown in FIG. 3, the upper compression plate 1 is provided with projections and through holes, for example, in four rows and six rows. And three protrusions and three through holes are provided alternately on the side. Two projections and two through holes are provided alternately in the vertical direction. In the case of the drawing, both the projections and the through holes are formed in an even number, but this is an example, and even if the projections are formed in odd rows and the odd number of the holes and the through holes are formed in an even number. good. The elastic force of the rubber plate is determined by the diameter of the projection and the diameter of the through hole in the relationship between the projection and the through hole. That is, the spring K (elasticity) becomes lower as the diameter of the through hole is larger than the diameter of the projection. Therefore, in consideration of the above, the number and diameter of the projections and the through holes are appropriately formed in comparison with the pad area. FIG. 3A illustrates the inner surface of the compression plate, and FIG. 3B illustrates the outer surface. Therefore, the upper compression plate and the lower compression plate have a front-back integrated relationship. In the case of this embodiment, both the projection 8 and the through hole 5 are formed in a columnar shape and a circular shape, and they are provided at equal intervals. However, the present invention is not limited to the illustrated one. The size, number, shape, and interval are appropriately changed in consideration of the elasticity of rubber. In the illustrated case, the diameter of the through hole 5 is slightly larger than the diameter of the protrusion 8, but the spring constant can be set lower as the diameter of the through hole 5 is larger than the diameter of the protrusion 8. The spring constant can also be adjusted by providing a difference in the diameter of the projection 8 or by giving a height difference to the projection 8.

[0007] The compression plate is a synthetic resin or a hard synthetic resin formed by mixing a metal powder or an inorganic substance into the synthetic resin and uniformly dispersing it. The material of the compression plates 1 and 2 is not particularly limited, but is described in Japanese Patent Application Laid-Open No. 50-1309.
The interference damping material of No. 76 itself has an anti-vibration ability and is effective. As shown in FIG. 3, the upper compression plate 1 is provided with a projection 8, a through hole 5, a tying guide 6, and a notch 7 at corners of the plate symmetrically to the lower compression plate 2. That is, the upper compression plate 1
The lower compression plate 2 is provided with a through hole 5 at the position of the projection 8, and the conjugate guide 6 is formed symmetrically at the corner of the upper compression plate, and the notch is formed at the corner of the lower compression plate. As mentioned above, FIG.
The anti-vibration pad is constituted by interposing an anti-vibration rubber plate 3 between the compression plates 1 and 2. FIG. 4 shows the vibration-proof rubber plate 3, and a known vibration-proof rubber is appropriately selected and used. 2C, the projections 8 of the upper compression plate 1 coincide with the positions of the through holes 5 of the lower compression plate 2, and the projections 8 of the upper compression plate 1 Corresponds to the position of the projection 8 of the lower compression plate 2.

When the anti-vibration pad receives a heavy load in such a state, the anti-vibration pad is compressed and deformed as shown in FIG. That is, the projections 8, 8 provided on the compression plates 1, 2 are pressed into the upper and lower surfaces of the vibration-isolating rubber plate 3 to compress the rubber, and a part 3 'of the compressed rubber is pierced into the compression plates 1, 2. Into the through hole 5. Thereafter, when the load is reduced, a part 3 'of the press-fitted rubber escapes from the one or two through-holes 5 and is restored. This action is the shearing force of the rubber, the cushioning action, and also the damping force. This anti-vibration effect is also a feature of the present invention. Further, the through holes 5 and 5 formed in the compression plates 1 and 2 are also escape places for the compressed rubber 3 '. Generally, when the flat surface of the rubber plate is compressed, the rubber elasticity near the outer peripheral portion is soft and the spring constant is low, but the central portion of the plate is strongly elastic and hard. This is because, when the outer peripheral portion of the rubber plate is compressed, the compressed rubber can easily escape, but the resistance to the escape of the rubber increases as it approaches the center of the rubber. Therefore, there was a defect that the elasticity of the rubber was non-uniform, but in the present invention, this defect was eliminated and the rubber plate was formed so that uniform elasticity and rubber shearing force could be obtained at any position of the rubber plate. ing.

As described above with reference to FIGS. 1, 2 and 3, in the present invention, the projections 8, 8 provided on the compression plates 1, 2 and the through holes 5, 5, and the engaging guides 6, 6 'for the corners and the notches are provided. Part 7,
At 7 ', a vibration isolating rubber plate is fitted from both sides to form an integrated structure. A single rubber plate 3 is completely embraced from both sides and a corner to utilize the shearing force and elasticity. Therefore, compared with Japanese Patent Application No. 60-173781 and Japanese Patent Application Laid-Open No. 8-14325, this vibration-proof pad eliminates the drawbacks of the conventional pad and exhibits an extremely excellent vibration-proof effect.

FIG. 1 is a partially cutaway view of an anti-vibration pad configured by housing a pad configured as shown in FIG. 2 in a box-shaped metal cover 4 (see FIG. 1). . As is clear from FIG. 1, the upper compression plate 1, the vibration isolating rubber plate 3, and the lower compression plate 2 are laminated, and the four corners are fixed by tying slides, covered with a metal cover 4, and provided with a metal cover. The anti-vibration pad 14 of FIG. Therefore, the anti-vibration function and the built-in anti-vibration rubber or resin compression plate
It also has the effect of blocking and protecting from ultraviolet light. In addition, the effect that the mounting work can be performed easily and securely is extremely large.

FIG. 5 shows a case where the vibration isolating pad 13 shown in FIG. 1 is applied to a slab track. Generally, as shown in FIG. 5, a slab track is formed by forming a concrete slab 18 on a bridge, installing a rubber mat 17 with asphalt mortar, a concrete block 16 and mounting a rail mounting bracket (type plate) 15 thereon. Place the variable pad 14 (for level) on the tie plate 15,
The anti-vibration pad 13 of the present invention is laid thereon, and the rail 9 is installed and fixed with the spring 11. When a train travels on a track, fine irregularities on a rail surface and minute irregularities on a wheel tire surface cause shock wave vibration due to high-speed rotation of a wheel accompanied by a heavy load. Wheel braking (brake)
Sometimes it happens. The vibration accompanied by these heavy loads acts in the vertical direction, but the rail expands and contracts because a force is also applied in the traveling direction of the rail. For this reason, the upper surface of the installed vibration isolating pad 13 is rubbed by the flexure and expansion and contraction of the rail. Also, the combination of the vibration isolating pads causes the rails to bend significantly due to the braking of the wheels and the like, and a displacement occurs when the rails rebound. When used for vibration isolation of a general power machine, it can be fixed by penetrating the mounting bolt, but cannot be done by the track pad. Accordingly, the metal cover 4 is used for holding, but the protrusion of the lower compression plate from the cover due to displacement is not prevented. This is because the height of the vibration isolating pad at the compression dead center is slightly higher than the height of the metal cover 4. This is also for security to keep the rail height low. Before mounting, the lower compression plate 2 is in a state of protruding below the cover. Therefore, place the anti-vibration pad on the tie plate,
When the rail is installed, the lower compression plate may protrude from the metal cover and may be installed in a shifted state. Therefore, it may occur before use. The anti-vibration pad 13 provided with the tying guide 6 for preventing this is extremely effective.

[0012]

As described above, the anti-vibration pad of the present invention has an upper compression plate having a plurality of projections and through holes alternately provided on one side, a tying guide and a notch at the corner, and Insert a metal cover with a vibration isolating rubber between the lower compression plate and the projection, the through hole and the corner, and the engagement guide and the notch in the upper compression plate. It is configured. For this reason, the vibration-proof rubber plate operates stably by the projections and the through holes provided on the compression plate, and the entanglement guides and the cutout portions. When the load is reduced, the anti-vibration rubber that has been compressed and press-fitted into the through hole escapes slowly when the load is reduced, and attenuates a sudden repulsive force. The anti-vibration pad of the present invention utilizes a structure having a damping force and a shear elastic force of rubber to perform anti-vibration by a cushioning action. In the case of a slab track, it is extremely difficult to prevent vibrations due to severe generation of vibration noise. The anti-vibration pad of the present invention retains the ability to safely operate and perform anti-vibration even by strong vibration such as a slab track by the tying guide of the rubber pad and the compression plate.

[Brief description of the drawings]

FIG. 1 is a perspective view in which a vibration isolating pad according to the present invention is assembled, a metal cover is mounted, and a part of the cover is cut away.

2 is a perspective view of the anti-vibration pad of FIG. 1 in a compressed state, and FIG. b shows the side surface at the time of non-compression.

FIG. 3 shows an inner surface a and an outer surface b of an upper and lower compression plate having the same structure.
1 is a perspective view of FIG.

FIG. 4 shows a perspective view a and a side surface b of a rubber vibration isolating plate.

FIG. 5 illustrates a use state of the vibration isolating pad of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper compression plate 2 lower compression plate 3, 3 ′ anti-vibration rubber plate 4 metal cover 5 through hole 6, 6 ′ tying guide 7, 7 ′ corner notch 8 protrusion 9 rail 10 spring fastener 11 rail pressing spring 12 Anchor vault 13 anti-vibration pad 14 variable pad 15 tie plate 16 support (block) 17 rubber mat 18 slab

Claims (2)

[Claims] 1. A synthetic resin plate or a resin plate formed by mixing a metal powder or an inorganic substance into a synthetic resin and uniformly dispersing the same. An upper compression plate provided with a notch portion, a lower compression plate provided with a projection, a through hole and a corner tying guide and a notch portion in a positional relationship to be fitted with the upper compression plate on one surface of the resin plate. An anti-vibration tie pad characterized by being formed into an integral structure with an anti-vibration rubber pad interposed therebetween. 2. An anti-vibration tie pad, wherein a metal cover is attached to the anti-vibration pad according to claim 1 so as to prevent the plate from protruding.