DD222618A1 - MEANS FOR FREE-FRAME PROTECTION ON BRAKE SOLE - Google Patents

Abstract

The invention relates to the field of antifreeze of brake pads on rail vehicles. The aim of the invention is to provide a means to prevent the freezing of brake pads on tires, thereby eliminating the heavy physical work and damage to the drive can be avoided. It was the task of finding an agent that has a good antifreeze effect and reduces the coefficient of friction no more than water. In addition, the funds should be available in the GDR. According to the invention, the object has been achieved by using a mixture of an organic (urea) and an inorganic substance (potassium carbonate), which influence one another in such a way that even when the eutectic does not fall below, no adherent crystalline layer is formed. The invention is suitable for the antifreeze of brake pads of rail-bound vehicles or for similar applications.

Description

Means for the antifreeze on Breast soles

' Application area

The invention relates to a means "that prevents the pest freezing of brake pads on Badreifen.von rail-bound vehicles.

Characteristic of the known technical solutions When parking railway carriages, insbesoniiere in passenger trains, it often comes as a result of the simultaneous action of cheers and moisture to freeze the brake pads on the Badreifen, Thus, the provision of trains is delayed to a great extent, resulting in train delays

 In individual frozen brake pads caused by the Batschen of the baths on the rails flat spots in the Badreifen that · · gen conditions, the ride comfort significantly affect and excessively burden the material, especially the Badlager, excessively, which is why an over-tighten the Badreifen is required.

At present, the freezing of brake pads is internationally prevented by the trains with released brakes, secured by drag shoes, parked or only the brakes are applied to the train ends. The disadvantage of this method is that due to leaks in the brake system over time, all brake pads come to rest and thus the risk of freezing persists. '. '

Chemical agents "like WaCl or MgClP or organic substances such as alcohols, are not used internationally as anti-freeze protection for brake pads.

Loosening festge.fro rener Bremss.ohlen done either by the strike with a. ' Hammer or release by crowbar or with a small number of frozen brake soles by briefly pressing the locomotive. The first method is very time consuming, / at the latter stone the already described! Adjust in the wheel tire.

Object of the invention . -

The aim of the invention is to find a chemical agent which, in addition to a good antifreeze effect, has a sufficiently long duration of action and does not reduce the addition coefficient significantly more than water.

Explanation of the essence of the invention;

In principle, it would be possible to use all thawing substances for antifreeze on brake pads. However, a key criterion is the low impact on the Bsib coefficient, which is why the majority of thawing chemicals are unsuitable for antifreeze on brake pads. Furthermore, in almost all chemicals falls below the eutectic no ^: sufficient protection against the freezing more available.

It has now been found that a mixture of a non-ionic water-soluble organic and an inorganic salt-like water-soluble substance offers a good antifreeze protection to below - 25 ⁰ C, wherein despite falling below the eutectic pest freezing of the brake pads does not occur because the antifreeze solution as a loose, non-adhesive amorphous mass solidifies. This is all the more remarkable, since both .Single components in solution for this phenomenon does not show and therefore the brake pads freeze below the eutectics. The friction coefficient is no more than reduced by water.

Measurements showed, both in wet bath tires and in wheel tires, which were wetted with the water according to the invention, a reduction of the Eeibbeiv / ertes by about 6% compared to dry Sadreifen.

According to the invention, the antifreeze contains urea and potassium carbonate, preferably in the ratio of 4-; 1, wherein the agent can be applied in both solid and dissolved in water form. -

Practical experiments have shown that when using the agent according to the invention freezing of the brake pads is reliably prevented. ,

embodiments example 1

Urea and potassium carbonate (A: 1) were plotted as a saturated solution on wet surfaces made of cast iron and steel and in the cooling cabinet: at - 25 ⁰ C cooled. After a storage time of 8 h at - 25 ⁰ C, the parts could be solved without special effort from each other.

Example 2

Using a tree spray, a saturated solution of 4 parts urea and 1 part potassium carbonate was sprayed onto wet bath tires, then the brakes were applied. After 12 hours at - 12 ⁰ C was in solving not Pestfrieren the brake blocks determined.

Example 3 ^

A saturated solution of urea and potassium carbonate in the ratio 4 ·. 1 was brought to the Badreifen by rolling over a polyurethane strip attached to both sides of the rails. After standing for 8 hours with applied brakes at - 15 ⁰ C, the brake pads could be solved without difficulty.

Example 4

A mixture of granulated urea and powdered

Potassium carbonate was placed on the wet rail head by means of a suitable device (inclined plane with reservoir). Then a tractor was pulled over the mixture. After 1O-hour concerns of the brake pads at - 20 ⁰ C, they could be solved without difficulty.

Claims (3)

Invention claim '. * ' An anti-freeze agent for brake linings of rail-bound vehicles having a long-lasting effect and having little influence on the friction coefficient, characterized in that it consists of a mixture of a non-ionic water-soluble organic and an inorganic salt-like water-soluble substance. 2. Composition according to item 1, characterized in that the organic substance is urea and the inorganic material is potassium carbonate, preferably in the ratio 4-: 0.8 to 4: 1.2. 3. Means according to items 1 and 2, characterized in that - it is used as a concentrated J solution or in solid form.