EP0697044A1

EP0697044A1 - Use of a rubber mixture to produce an elastic sole, especially a rail cushion

Info

Publication number: EP0697044A1
Application number: EP95910394A
Authority: EP
Inventors: Edgar Böhm; Manfred Klerk; Karl-Heinz Krause; Gerhard Merkmann; Rolf STEINMÜLLER; Klaus Tübel
Original assignee: Phoenix AG
Current assignee: Phoenix AG
Priority date: 1994-02-19
Filing date: 1995-02-15
Publication date: 1996-02-21
Also published as: DE19504937A1; US5735457A; JPH08509533A; WO1995022659A1

Abstract

The invention relates to the use a) of a rubber mixture, especially one based on natural rubber (NR), epoxy natural rubber (E-NR), isoprene rubber (IR), butadiene rubber (BR), acrylate rubber (ACM) styrene-butadiene rubber (SBR) or clippings of these rubbers especially NR/SBR or NR/BR clippings, and the usual mixture ingredients like fillers, plasticisers, anti-aging products and possibly other additives; b) to produce a flat elastic sole (3) with low dynamic stiffening, high dynamic loadability, high specific volume resistance and low frequency dependence of the dynamic stiffening, which is inserted especially between the foot of the rail and the top of the sleeper on high-speed lines, where the base (5) of the sole (3) has at least one recess (11) to form a peripheral edge (13) and faces the top of the sleeper, while the top of the sole (3), i.e. the rail foot supporting surface, is substantially smooth.

Description

Use of a rubber mixture for the production of an elastic intermediate layer, in particular

Track pad

Elastic liners, especially on railway lines between the rail base and the top of the sleeper

(e.g. concrete sleepers) are known

(EP-B-0 295 685, Fig. 1; EP-A-0 541 884, Fig. 1). Such rail pads reduce the vertical rigidity of the track, increase the smoothness of the rolling material, reduce the airborne noise level in the vehicles and reduce the crushed stone pressure.

The elastic rail pads must be permanent

(at least 20 years) and stable, weather and aging resistant, water and temperature resistant (in the range of -20ºC to + 50ºC) as well as oil and grease resistant.

As a result of the increasing expansion of high-speed lines, rail documents also have to be built

- in the low-frequency range (<50 Hz), in the medium-frequency range (50 Hz to 400 Hz) and in the high-frequency range (> 400 Hz to 2000 Hz) a low dynamic stiffening (rigidity, hardening);

- a high dynamic resilience;

- a high volume resistivity of

in particular ≥ 10 ⁸ Ω cm and

- a low frequency dependence of the dynamic

stiffening

have, the Federal Railways for a number of testing criteria has set target values. With the use

- A rubber mixture, especially based on natural rubber (NR), epoxidized natural rubber (E-NR), isoprene rubber (IR), butadiene rubber (BR), acrylate rubber (ACM), styrotebutadiene rubber (SBR ) or blends of these types of rubber, in particular NR / SBR or NR / BR blends, as well as customary mixture ingredients, such as fillers, plasticizers, anti-aging agents and optionally other additives; in combination with

- the constructive design of the plate-shaped,

elastic liner, especially the

rail pad described above, the

Bottom of the liner to form a

circumferential edge with at least one recess and facing the smoldering top

is while the top of the liner,

d. H. the rail foot support surface is essentially flat; the task resulting from the high demands is solved.

The rubber mixture expediently contains one

Rubber content of 45 to 75 wt .-%, in particular

55 to 65% by weight.

Appropriate constructive design variants are mentioned in claims 3 to 16, with detailed reference to these design features in the context of the figure description is received

In the following experimental part, an exemplary mixture recipe (Table 1) with test results (Table 2) is recorded, whereby the following symbols apply to the test criteria: static axial stiffening C _stat

dynamic axial stiffening C _dyn

static depression f _{s did}

dynamic depression

fdyn

dynamic stiffening factor ℜ

The test specimen was a profiled plate with the following

Dimensions: rectangular plate shape 145 mm × 160 mm

Thickness (i.e. thickness) of the plate 7 mm

Rare "width 12 mm

Number of knobs with

Rectangular Top View Shape 20 (4 × 5)

Depth of the grid-shaped recess 4 mm

Number of ventilation joints 2

The invention will now be explained using exemplary embodiments with reference to schematic drawings. Show it:

Fig. 1 shows a rail arrangement with elastic

Intermediate layer (cross-sectional view);

Fig. 2, 3, 4 three embodiments of the underside of the elastic intermediate layer with different recess variants

(Top view);

Fig. 5, the side wall of a recess

(Cross-sectional view);

Fig. 6 is an elastic intermediate layer, in which the entire recess is filled and the top is provided with edge strips (cross-sectional representation).

1, the rail arrangement consists of the following parts:

1 rail

2 rail feet

3 elastic intermediate layer (rail underlay)

4 top of the intermediate layer (rail foot support surface)

5 bottom of the intermediate days

6 top of the threshold (e.g. concrete threshold)

7 fastening system

Fig. 2 now shows the underside (5) of an elastic

Intermediate layer (3), in which the entire recess (8) is a system of three parallel joints (8a, 8b, 8c), which are arranged separately from one another. These joints can run in the longitudinal or transverse direction of the rail. The circumferential plate edge (9) expediently has a minimum width X of 5 mm.

According to Fig. 3, the underside (5) of the elastic intermediate layer (3) is provided with a recess (10) which is formed from two parallel joints (10a, 10b) and a transverse joint (10c) (H-shaped plan view shape).

Fig. 4 shows a further variant of the underside (5) of an elastic intermediate layer (3), in which the entire recess (11) is a grid system of joints (11a, 11b), with the formation of four knobs (12) have a rectangular plan view here.

With a number of nubs n> 4, it is advantageous if the nubs have a larger surface in the corner area of the elastic intermediate layer than those nubs in the

Center area. This basic principle was also implemented in the test specimen with a total of 20 knobs.

The peripheral edge (13) is equipped with a ventilation joint (14).

5 shows the cross section of a recess (15), the side wall (16) of which runs vertically in the upper part (16a) and angled in the lower part (16b), the angle α advantageously being 45 to 60. The minimum depth Y of the recess is 3 mm,

Fig. 6 now shows a special variant of an elastic intermediate layer (3). Here, the entire recess (17) is filled with a soft, elastic material (18) with very little water absorption, in particular with cellular rubber

(ie foamed). In addition, the top (4) provided with edge strips (19) which run in the longitudinal direction of the rails.

The recess of the elastic intermediate layer (3) can be formed by subsequent cutting (e.g. laser cutting, water jet cutting) of a plate. Also the

A corresponding molded article can be manufactured using the CM, IM or ITM process.

Even if the main focus of the elastic intermediate layer according to the invention is on the rail bearing sector, the profiled plate can also be used for storing heavily loaded machines.

The concrete sleeper would then be a corresponding concrete foundation, while a machine foot would be the rail foot

would replace. Here, too, the profiled would

Bottom rest on the foundation, while the essentially flat top would form the machine foot support surface.

Claims

Expectations

1. Use a) a rubber mixture, in particular based on natural rubber (NR), epoxidized natural rubber (E-NR), isoprene rubber (IR), butadiene rubber (BR), acrytate rubber (ACM), styrene-butadiene - Rubber (SBR) or blends of these rubber types, in particular NR / SBR or NR / BR blends, as well as customary mixture ingredients, such as fillers, plasticizers, anti-aging agents and optionally other additives; b) to produce a plate-shaped, elastic

Intermediate days (3) with

- low dynamic stiffening,

- high dynamic resilience,

- high volume resistance and

- low frequency dependence of the dynamic

Stiffening,

which in particular between the rail foot (2) and

Threshold top (6) is arranged at high-speed lines, the bottom (5) of the intermediate layer (3) forming a circumferential

Edge (9, 13) with at least one recess

(8, 10, 11, 15, 17) and the threshold top (6) faces, while the top (4) of the intermediate layer (3), ie the rail foot support surface, is essentially flat.

2. Rubber mixture according to claim 1, characterized in that it has a rubber content of

45 to 75 wt .-%, in particular 55 to 65 wt .-%, contains.

3. Eastic liner according to claim 1 or 2,

characterized in that the entire recess (8) is a system of at least two parallel joints (8a, 8b, 8c) which are arranged separately from one another.

4. Eastic liner according to claim 1 or 2,

characterized in that the entire recess (10) is a system of at least two parallel joints (10a, 10b), which over at least one

Transverse joint (10c) are connected to one another, in particular in an H-shaped plan view.

5. Elastic liner according to claim 1 or 2,

characterized in that the entire recess is a grid system of joints (11a, 11b), with the formation of knobs (12).

6. Elastic liner according to claim 5, characterized

characterized in that at least four knobs (12)

available.

7. Elastic liner according to claim 5 or 6,

characterized in that the knobs have a circular, rectangular and / or square plan view shape.

8. Elastic intermediate days according to claim 5, 6 or 7, characterized in that the knobs at one

Number n> 4 in the corner area of the intermediate layer have a larger surface than those knobs in the center area.

9. Elastic liner according to one of claims 1

to 8, characterized in that the side wall

(16, 16a, 16b) of the recess (15) runs vertically and / or at an angle.

10. Elastic liner according to claim 9, characterized

characterized in that the angle α of the side wall (16b) is 45 to 60 °.

11. Elastic intermediate layer according to one of claims 1

to 10, characterized in that the edge (9, 13) has a minimum width X of 5 mm.

12. Eastic intermediate days according to one of claims 1

to 11, characterized in that the recess (15) has a minimum depth Y of 3 mm.

13. Elastic intermediate layer according to one of claims 1

to 12, characterized in that the edge (13) is equipped with at least one ventilation joint (14).

14. Elastic intermediate layer according to one of claims 1

to 13, characterized in that the entire

The recess remains empty.

15. Elastic intermediate layer according to one of claims 1

to 13, characterized in that the entire

Recess (17) with a soft, elastic Material (18) with very low water absorption, especially with cellular rubber, is filled.

16. Elastic intermediate layer according to one of claims 1

to 15, characterized in that the top (4) of the intermediate days is provided with edge strips (19) which run in the longitudinal direction of the rails.