DK145266B - NOISE REDUCING SHINES - Google Patents

Description

in 145266

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise reducing rail for vehicles traveling on tracks, in particular a track rail for curves in tram tracks, which rail in the running and guide area consists of a non-ferrous metal, while the rest of the rail cross section is of steel. The rail according to the invention is peculiar to the characterizing part of claim 1.

It is known that rail vehicles, especially in curves with small radii, can cause noise whose strength in many cases exceeds the tolerable and permissible. This noise is mainly caused by slip oscillations, which can, for example, be attributed to the wheels fixedly fixed on an axis having to travel different path lengths when traversing the curve, whereby one * 15 skating takes place. the road traveled. Before the skid, however, an increasing tension occurs in the wheels until the adhesive force between the wheels and the rail is exceeded and a set relaxation takes place. Under the influence of this, the wheelset performs frictional gravity: 20, whose vibrational energy is emitted in the form of sound which partly propagates through the air to the surroundings and partly propagates through the metal bodies.

These conditions occur especially in tram rails which exhibit very sharp curves. The stiffness and groove of the grooving rails allow the tram wheels, which are pressed and sliding in the curves, under certain contact conditions to carry out rapid friction oscillations, leading to the well-known, in many cases unbearable, high pitch bearing noise, which, among other things, leads to a strong lateral direction. 30 wear on the rail heads and guide rails.

Therefore, in order to control noise 'which is particularly necessary in inhabited areas, lubrication of the curve rails is often carried out. Further, attempts have been made to decrease the volume by changing the track width as well as by grinding and polishing the tread and guide surfaces, which, however, has not led to the desired result.

It is an object of the present invention to reduce the noise caused by rail vehicle driving through curves, and especially by tram driving through low radius curves, or to completely eliminate noise generation.

The rail in question is characterized in that the non-ferrous metal is a single or multi-phase bronze containing at least 50% copper and one or more alloying elements.

As a main alloy addition, aluminum, iron, manganese and nickel have proved particularly suitable.

A particularly preferred non-metal composition, which also satisfies the strength properties requirements, consists of 8% aluminum, 2% iron, 12% manganese and 2% nickel, while the remainder is copper.

The non-ferrous metal is preferably joined to the rest of the steel rail material by a material joining. The material joining is preferably done by welding.

The process for manufacturing the rail according to the invention can be applied to both new and used rails, both at the manufacturing sites and in the track area. The joints needed for welding in the running and guiding surfaces of the rails can be improved either by rolling or later mechanically, for example by grinding. The welders swear in their location to the places with the greatest wear, 145266 3 and must, for example, for rails fitted with grooves, be placed predominantly on the rail head and guide rail side. A special improvement of the joint can occur, for example, when laying and putting in rails-3 rails with complete steel cross-section in tram tracks, as after a short time wear of the rails heads and guide rails simultaneously form the joints necessary for welding in the running and manage flat areas.

The welding of non-ferrous metals, preferably bronze electrodes, can then be done either by hand or by semi-or whole-machine welding methods. Particularly suitable is powder welding or welding under protective gas with melting bronze welding wire. To this end, a welding apparatus is advantageously used which consists essentially of a motorized auxiliary trolley and a welding head which can be adjusted on it. During the welding process, the welding apparatus, being pulled by the scooters on the auxiliary trolley, is passed over the rail to be welded, whereby the additive material, preferably 20 of bronze, is supplied by a wire feeder at a speed adjusted according to the auxiliary trolley, at an arc formed between the electrode and the rail is applied to the welding surface. After applying the non-ferrous metal, preferably the bronze, the rail is ground in the proper profile.

In addition to welding non-ferrous metals, preferably bronze welding wires, non-ferrous metal profiled moldings can also be similarly connected to the rail by other means, for example, by screwing or bonding. However, it has been found that a welding of material best meets the requirements for operation. However, it is also possible to design the correct rail profile in the said areas otherwise.