Title of Invention	DEVICE FOR BRAKING A RAIL VEHICLE
Abstract	The invention relates to a device for braking a rail vehicle, comprising a braking element that can be forced against a wheel. The invention is characterized in that the wheel comprisises a surface area (6) which is used as a friction ring and against which the braking element can be forced.

Full Text

PCT/EP2006/063637 - 1 - 2005P07636WOIN Descripton Device for braking a rail vehicle The invent, ion relates to a device for braking a rail vehicle, comprising a braking element which cart be pressed against a wheel. In addition to other brake systems, a rail vehicle has a friction brake. In this context, a braking element is pressed against a wheel or a component which rotates with the wheel. In the case of a known block brake, a brake block, is pressed against the running surface of a rail wheel. As a result, the running surface is mechanically loaded and heat is applied to the wheel via the running surface. As a result, the service life of the wheel is shortened. The running surface can in fact become raw due to the braking processes. It is even possible for grooves to be produced. This then leads to increased travel noises which arc undesired. If has also already been proposed to use disk brakes on rail vehicles. In this context, a stationary braking element is pressed onto a brake disk which is rotating with the wheel. finally, in the case of relatively small wheels it has also already been proposed that a braking element which docs not rotate enters into contact directly with the end side of the wheel in order to brake the rail vehicle. This is possible with these small wheels since they are embodied as disk wheels and do not have any contours. Customary railway wheels are composed, viewed radially from the axle to the rail, of the wheel hub, the wheel web, the wheel rim and the wheel flange. The invention is based on the object of specifying a device for braking a rail vehicle which provides the PCT/EP2006/063637 - 2 - 2005P07636WOIN aforesaid advantages of a disk brake, specifically that the running face of the wheel cannot be damaged, and which nevertheless is cost-effective and, of technically simple design. Moreover, even in the case of large railway wheels if is to have contours which function reliably. According to the invention, the object is achieved by virtue of the fact that the wheel has a surface area which serves as a friction ring and against which the braking element can be pressed. The aim is therefore that the wheel itself should already be fabricated in such a way that it can serve as a rotating brake disk of a disk brake. The braking element is then generally a nonrotating braking element which is pressed onto the brake disk in the axial direction. The advantage is achieved that, on the one hand, the disadvantageous loading of the running face of the wheel by a block brake is avoided, and that, on the other hand, the rotating disk which has previously been necessary in a disk brake is no longer necessary. A braking effect which is just as good as a disk brake is advantageously achieved with significantly less technical complexity and thus at lower cost, furthermore, a significantly better braking effect is achieved than when the braking element is pressed directly onto the running face of the wheel. As a result of the configuration of a surface area on the end side of the wheel as a friction ring, there is advantageously significantly Jess wear than in the case of direct braking on the wheel surface. For example, the surface area which serves as a friction ring is located on the wheel web. According to another example, it is located on the wheel rim. According to a third example, the surface area which serves as a friction ring is located on the wheel hub. 3 PCT/EP2006/063637 2005P07636WOIN The three variants are suitable in the same way in terras of their braking effect. PCT/EP2006/063637 2005P07636WOIN By virtue of the surface area which serves as a friction ring, the, wheel is, for example, not thicker than is otherwise customary. The wheel is even provided with the desired surface area during its actual manufacture. However, it is possible, for example, for the wheel to be thicker at the surface area which serves as a friction ring than otherwise, in this variant, the desired surface area is also part of the wheel body itself. For example, on the surface area which serves as a friction ring, the wheel has a recess which, when the braking clement is pressed against the wheel, is covered but not filled and forms a cooling duct. The thermal energy produced during the braking process is then taken up in this cavity by the air. Cooling ribs are integrally formed on the wheel, on the surface area which serves as a friction ring. This provides the advantage that the thermal energy which is produced during the braking process is taken up by the air between the cooling ribs . For example, a groove is arranged as a wear mark in the wheel, on the surface area which serves as a friction ring. If this groove can no longer be seen, it must be assumed that wear has occurred so that repair or replacement is necessary. The device for braking a rail vehicle according to the invention provides the advantage that when there is a small amount of wear on the wheel reliable and rapid braking is always ensured without a complex and expensive brake disk. The drawing shows a section through a rail wheel from the axle to the running face, with the wheel having a surface area which serves as a friction ring: 5 PCT/EP2006/063637 2005P07636WOIN The rail wheel has a running face 1. which enters into contact, with the rail. In the region of the running face 1 there is the wheel flange 2 which holds the wheel on the rail. The running face 1 and wheel flange 2 are components Of the wheel rim 3. The wheel web 4 adjoins the center point of the wheel. The wheel hub 5 is located in the region of the axle. A surface area 6 which serves as a friction ring is located on the wheel web 4. This surface area 6 is distinguished by a particular surface treatment. A groove is arranged as a wear mark 7 in the surface area 6. In order to brake, a braking element (not shown) is pressed axially against the surface area 6. The braking device: shown provides the same effect without a customary wheel brake disk. 2005P07636WOIN 6 PCT/EP2006/063637 Patent claims 1. A device for braking a rail vehicle, comprising a braking clement which can be pressed against a wheel, wherein the wheel has a surface area (6) which serves as a friction ring and against which the braking element can be pressed characterized in that, on the surface area which serves as a friction ring, the wheel has a recess which, when the braking clement is pressed against the wheel, is covered but not filled and forms a cooling duct. 2. The device as claimed in claim 1, characterized in that the surface area (6) which serves as a friction ring is located on the wheel web (4). 3. The device as claimed in claim 1, characterized in that the surface area which serves as a friction ring is located on the wheel rim (3). 4. The device as claimed in claim 1, characterized in that the surface area which serves as a friction ring is .located on the wheel hub (5). 5. The. device as claimed in one of claims 1 to 4, characterized in that the wheel is thicker at the surface area which serves as a friction ring than otherwise. 6. The device as claimed in one of claims 1 to 5, characterized in that cooling ribs are Integra 11y formed on the wheel, on the surface area which serves as a friction ring. 7. The device as claimed in one of claims 1 to 6, characterized in that a groove is arranged as a wear mark (7) in the wheel, on the surface area (6) which serves as a Friction ring . The invention relates to a device for braking a rail vehicle, comprising a braking element that can be forced against a wheel. The invention is characterized in that the wheel comprisises a surface area (6) which is used as a friction ring and against which the braking element can be forced.

Documents:

04803-kolnp-2007-abstract.pdf

04803-kolnp-2007-claims.pdf

04803-kolnp-2007-correspondence others.pdf

04803-kolnp-2007-description complete.pdf

04803-kolnp-2007-drawings.pdf

04803-kolnp-2007-form 1.pdf

04803-kolnp-2007-form 2.pdf

04803-kolnp-2007-form 3.pdf

04803-kolnp-2007-form 5.pdf

04803-kolnp-2007-gpa.pdf

04803-kolnp-2007-international exm report.pdf

04803-kolnp-2007-international publication.pdf

04803-kolnp-2007-international search report.pdf

04803-kolnp-2007-pct request form.pdf

4803-KOLNP-2007-(21-12-2011)-ABSTRACT.pdf

4803-KOLNP-2007-(21-12-2011)-AMANDED CLAIMS.pdf

4803-KOLNP-2007-(21-12-2011)-CORRESPONDENCE.pdf

4803-KOLNP-2007-(21-12-2011)-DESCRIPTION (COMPLETE).pdf

4803-KOLNP-2007-(21-12-2011)-FORM-1.pdf

4803-KOLNP-2007-(21-12-2011)-FORM-2.pdf

4803-KOLNP-2007-(21-12-2011)-FORM-3.pdf

4803-KOLNP-2007-(21-12-2011)-OTHER PATENT DOCUMENT.pdf

4803-KOLNP-2007-(21-12-2011)-OTHERS.pdf

4803-KOLNP-2007-CORRESPONDENCE OTHERS 1.1.pdf

4803-KOLNP-2007-OTHERS.pdf

4803-KOLNP-2007-PRIORITY DOCUMENT.pdf

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