JP2560142Y2 - Low spring constant type track pad - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track pad interposed between a railroad rail and a sleeper , and in particular, has a spring constant as low as about 15 to 50 tons / cm.

[0002]

2. Description of the Related Art In order to prevent noise when a train or the like travels on a track, to prevent vibration from being transmitted to a ground surface, and to improve ride comfort on a train, a train rail and a sleeper are used. A track pad made of an elastic plate is interposed. In this type of track pad, as shown in FIGS. 5 and 6, a plurality of linear concave grooves a are provided on the lower surface and the upper surface at regular intervals. The cross-sectional shape of the elastic plate is such that the concave and convex portions are continuously repeated, and the width of the convex portion formed by the groove a is about 1
0 mm, the width of the recess is about 8 mm, and the depth of the recess is about 3 mm.

[0003]

The conventional track pad is manufactured in a shape having a plurality of linear grooves, but this type of track pad has a spring constant of about 100 tons / cm and a large spring. It is a constant. However, if there is a demand for better ride comfort as recently, lowering the spring constant of the track pad is another method of improvement. In this case, the spring constant of the track pad is reduced to about 1/5 of the current state. There is a need. For this purpose, the spring constant can be reduced by increasing the width of the linear groove of the conventional type track pad, but if the load is increased by increasing the width of the groove, the ceiling surface of the recess falls down to the support surface. It will be grounded Te, width I constant in a practical load range
Could not be lowered to some extent .

In order to reduce the spring constant of the track pad, a urethane foam plate is interposed between the rail and the sleeper . However, the cost of such a track pad is high, and the track pad is expensive. A track pad used in large quantities would be too costly. Therefore, the present invention
An object of the present invention is to provide a track pad interposed between a rail and a sleeper , in which a spring constant is reduced to about 15 to 50 ton / cm and a track pad is inexpensive.

[0005]

SUMMARY OF THE INVENTION According to the present invention , a low spring constant is provided.
In order to solve the above-mentioned problem , the track pad is interposed between the railroad rail and the sleeper, and is used for vibration isolation or improving ride comfort.
Or track pad that provides sleeper protection
Of the elastic plate made of rubber or synthetic resin
Of the upper surface in contact with the road rail or the lower surface in contact with the sleeper
Circular cross-section or polygon of the same shape on one of the surfaces
Many blind-hole-shaped first recesses having a cross section, and a recess arrangement ratio of 25
About 45% and it is arranged almost uniformly on the one surface.
In addition, on the other of the upper surface or the lower surface
The same position as the first concave portion is provided at a position on the back side of the first concave portion.
A blind hole-shaped second concave portion is provided, and a bottom surface of the first concave portion and the second concave portion are provided.
Forming a flat partition between the bottom of the second recess
Ensures electrical insulation between the top and bottom surfaces
And when the elastic plate is pressed, the first
The recess (6a or 6b) or the second recess (6b or 6)
a) The diameter of a) is not expanded, and the spring constant is
Almost uniform and its value in the development direction of the track pad
Is about 15 to 50 tons / cm.
Sign.

[0006]

According to the above-mentioned low spring constant type track pad , the upper surface or the sleeper which comes into contact with the railroad rail among the surfaces of the elastic plate.
A circular section of the same shape is formed on one of the
A large number of concave first concave portions having a surface or polygonal cross section
Almost uniformly on the one surface with a partial arrangement ratio of about 25 to 45%
And the other of the upper surface or the lower surface
At the position on the back side of the first concave portion on the surface of
Since the second concave portion having the same blind hole shape as the concave portion is provided, there is no portion that rises from the grounding surface unlike the conventional example. For this reason, when the material of the elastic plate itself is softened to reduce the spring constant, the elastic plate having a large number of the first concave portions and the second concave portions has
Will receive a load on the entire surface other than the first recess and the second recess, the value of the spring rate is about 15 to 50 tons / cm
The track pad is as low as possible, and its vibration damping provides a desired soundproofing and vibration-proofing effect, and further improves the riding comfort of a train running on railroad rails. Further, the large number of the first and second concave portions provided on the elastic plate are substantially uniform over the entire surface of the elastic plate with the concave portion arrangement ratio of about 25 to 45%.
Because it is arranged in, the spring constant in each position of the elastic plate
This is where there is generally uniformity and more desirable characteristics of the track pad. Further, the bottom of the first concave portion and the
(2) Since a flat partition wall portion was formed between the bottom of the concave portion,
Ensure electrical insulation between the upper and lower surfaces of this track pad.
And when the elastic plate is pressed, the first concave portion or
Can prevent the diameter of the second concave portion from expanding.
You.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.
When laying railroad rails, sleepers 3 are arranged at appropriate intervals on a concrete surface 1 used as a track or on a ballast 2 on the ground, and rails 5 are fixed on the sleepers 3 via track pads 4. You. The track pad 4 is provided to attenuate the transmission of the vibration when the train travels on the rail 5 to the concrete surface 1 and to improve the ride comfort of the person on the train, It is made of synthetic resin elastic plate and has a hardness of about 6 to lower the spring constant.
A 0 degree elastic plate was used.

[0008] The elastic plate constituting a track pad 4, the
Blind of the same shape on the entire upper surface of the surface that contacts rail 5
With hole-shaped recesses 6a many are arranged with a substantially uniform pitch, the back side of the recess 6a at the lower surface of the elastic plate
A blind hole-shaped recess 6b similar to the recess 6a is provided at the position.
I have. That is, the recesses 6a and 6b correspond one to one.
You. In the present embodiment, each recess 6a on the upper surface of the elastic plate,
Alternatively, the concave portions 6b on the lower surface of the elastic plate are arranged so as to be shifted from each other vertically and horizontally by a half pitch so that the entire spring constant is substantially uniform. The plane of the elastic plate constituting the track pad 4 of the present embodiment is 140 mm in length and width, 180 mm in width, and 1 mm in thickness.
0 mm, the diameter of the concave portion 6a or 6b was 10 mm, and the arrangement pitch was 15 mm. Also, the concave portion on the upper surface of the elastic plate
Of the total cross-sectional area of the concave portion 6a with respect to the entire area including the
Ratio, or the total area including the concave part on the lower surface of the elastic plate
The ratio of the sum of the sectional areas of the concave portions 6b to the ratio of
In this example, the value of the concave portion arrangement ratio in this embodiment is about 33%, but the value of the concave portion arrangement ratio is 25 to 4%.
To 5% of it is desirable in achieving uniform spring constant of the entire surface. When the above track pad was manufactured and the spring constant was measured, the relationship was as shown in FIG. 3, and the spring constant was as low as about 20 tons / cm. 5 and 6
In was measured similarly spring constant in the conventional type of track pad shown, as shown in FIG. 3, the spring constant of the embodiment
It is much larger than the track pad .

In the track pad 4 of the above embodiment , as shown in FIG. 4, the bottom of the pair of recesses 6a and the recess 6b
Between the bottom surface of the upper and lower surfaces parallel to the partition wall portion 7 of the elastic plate are integrally formed of the same material as the bullet <br/> resistance plate. According to this structure, it is placed on maintaining the electrical insulation between the upper and lower surfaces of the track pad 4. In addition, by providing the partition 7, burrs are less likely to appear at the time of manufacture, and the manufacture is simplified. Further, in the track pad 4 of the above embodiment, the concave portion 6a, the partition wall portion 7, and the concave portion
Although the cross section of 6b is circular, other polygons may be used. Also , the arrangement of the concave portions 6a, the partition portions 7, and the concave portions 6b and the concave portions may be used.
The diameters of the portion 6a, the partition 7 and the recess 6b are not limited to those described above.

[0010]

[Effect of the invention] In the low spring constant type track pad of the invention,
Numerous concave parts are provided on the upper and lower surfaces of the elastic plate.
Since the track pad does not have a portion that rises with respect to the lower surface, a spring constant as low as about 15 to 50 ton / cm can be achieved, vibration damping in the track, and a train running on the track to a good ride in the Kotogaki, also Ru it is possible to secure the sleepers. Also,
The pair of recessed portions are provided with 25 to 45 over the entire upper and lower surfaces of the elastic plate.
% Are arranged almost uniformly with a concave arrangement ratio of about
The spring constant at each position of the elastic plate is almost uniform,
It has desirable characteristics as a pad. In addition, the concave
It is provided with the partition wall portion between the recesses, between the rails and sleepers
It is placed on maintaining the electrical insulation, water and dust or the like is prevented from entering under the track pad, further elastic plate is in the first recess 6a or the second recess 6b when pressed
Can diameter so that reluctance expansion, advantage
Also have.

[Brief description of the drawings]

1 is a surface portion on a track pad of the present invention.

FIG. 2 is an explanatory view of a state in which a track pad of the present invention is interposed between a rail and a sleeper .

FIG. 3 is a characteristic diagram showing measurement results of a spring constant.

FIG. 4 is a partial cross-sectional view illustrating a configuration of a partition between concave portions .

FIG. 5 is a plan view of a conventional track pad.

FIG. 6 is a side view of a conventional track pad.

[Explanation of symbols]

3 sleepers 4 track pads 5 rails 6a, 6b recess 7 partition

Continuing on the front page (72) Inventor Kazuo Arai 3-105 Sugaya, Ageo-shi, Saitama Fukukoku Co., Ltd. (72) Inventor Kazuyoshi Murakami 3-105, Sugaya, Ageo-shi, Saitama Fukukoku Investigator Ryuji Kawashima

Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. A combination of a railroad rail (5) and a sleeper (3).
Interposed, anti-vibration or ride comfort improvement or sleepers
A track pad (4) for protecting the railroad track (4) on the surface of an elastic plate made of rubber or synthetic resin;
(5) or the sleeper (3)
One of the lower surfaces has the same circular cross section or
Is a blind-hole-shaped first concave portion (6a or 6a) having a polygonal cross section.
b), one of the above-mentioned ones at a concave arrangement ratio of about 25 to 45%.
And the other surface of the upper surface or the lower surface.
The first recess is located at a position on the back side of the first recess (6a or 6b).
Blind hole-shaped second concave portion (6b or 6b) similar to the portion (6a or 6b).
Is provided with 6a), the bottom surface of the first recess (6a or 6b) and the second recess
A flat partition wall (7) between the bottom of (6b or 6a)
Forming an electric current between the upper surface and the lower surface.
The elastic plate was pressed while securing the electrical insulation.
The first recess (6a or 6b) or the second recess
(6b or 6a) so that the diameter of the track pad (4) does not expand, and the spring constant is substantially
Uniform and its value is about 15 to 50 ton / cm
A low spring constant type track pad characterized in that: