Brake pad railway rolling stock

 

(57) Abstract:

The invention relates to the brake pads railway rolling stock and can be used in railway transport. Brake pad is made of two longitudinal layers having different conductivity, the ratio of the mass of the composite layers is selected from the relation where M1- weight of the composite material over the conductive layer, M2- the mass of the composite is less thermally conductive layer. The technical result is improved performance brake pads by reducing the imbalance of thermal loads pads during operation by balancing the mass ratio of the conductive and less conductive layers.

The invention relates to the brake pads railway rolling stock, for example, blocks of passenger cars, electric trains, etc.

The analogue of the claimed invention is a rail brake pad comprising a polymeric composite friction element and a metal frame (see B. A. Shiryaev. Production of brake pads made of composite materials for railroad cars. - M.: Chemistry, 1982, S. 14-18). Sagaut with the essential features of the claimed invention.

The disadvantage of analogue is the low thermal conductivity of the friction element, causes, especially for high-speed vehicles (passenger trains), the overheating of the friction surface, which leads to defects in the surface of the rolling wheel and the friction surface of the pads and premature failure of the friction pair.

The analogue of the claimed invention is a rail brake pad comprising a metal frame and heat-conducting polymer composite friction element, which contains graphite (see B. A. Shiryaev. Production of brake pads made of composite materials for railroad cars. - M.: Chemistry, 1982, S. 16). The essential features of similar “metal frame and heat-conducting polymer composite friction element coincide with the essential features of the claimed invention.

The disadvantage of analog is the deterioration of the operating characteristics of the pads due due graphite high conductivity, resulting in the operation of the pad with the use of electric traction, when the rails and wheels are respectively the conductors of the power supply, through a block flow value is acesso friction and wear electrodynamic processes the result is an additional component wear - electric and decreases the stability of the friction coefficient in the anodic polarization pads.

Analogous to the claimed invention is a pad comprising a metal frame and the composite friction element is made of two longitudinal layers having different conductivity, the layer which contains the frame pads, has a lower conductivity (see RF patent №2114019, IPC 7 61 N 7/02, 1998). The essential features of similar “metal frame, polymer composite friction element is made of two longitudinal layers coincide with the essential features of the claimed invention.

The disadvantage of analog is insufficient conductivity of the friction element contributing to the overheating of the friction surface and premature failure of the friction pair.

The prototype of the claimed invention is a pad comprising a metal frame and polymer composite friction element is made of two longitudinal layers having different conductivity, the layer which contains the frame pads, has a smaller teploprovodnostyu composite friction element, made of two longitudinal layers having different conductivity, the layer which contains the frame pads, has a lower thermal conductivity coincide with the essential features of the claimed invention.

The disadvantage of the prototype is uneven thermal body pads, caused by the unequal heat transfer and the time of heating and cooling of the individual layers of the pad during operation, resulting in possible deformation and cracking of the pad.

The task, which is aimed by the invention is the improvement of the operational characteristics of railway brake pads by reducing the imbalance of thermal loads pads during operation by balancing the mass ratio of the conductive and less conductive layers.

To achieve the technical result in brake Shoe for railway vehicles, comprising a metal frame and polymer composite friction element is made of two longitudinal layers having different conductivity, the layer which contains the frame pads, has a lower thermal conductivity and mass of the polymer HDMI the conductive layer;

M2- the mass of the composite is less thermally conductive layer.

The essential features of the claimed invention “weight polymer composites, made from layers selected from the relation

where M1- weight of the composite material over the conductive layer;

M2- the mass of the composite is less thermally conductive layer, are different from the characteristics of the prototype.

Brake pad railway rolling stock includes a metal frame and heat-conducting polymer composite friction element is made of two longitudinal layers, each of which is made of polymer friction composite based on a polymeric binder with various fillers, including fiber and dispersed. When this composite is more thermally conductive layer additionally contains a filler of a material with high heat conductivity, such as graphite crystal, cryptocrystalline or mixtures thereof, various metals and other Metal frame pads placed in the less conductive layer. Mass M1the composite layer is more conductive to heat than the mass M2composite is less thermally conductive layer (without weight metal frame) in 1,5-2,0 nuclear biological chemical (NBC composition.

A specific example of the invention is to train a two-layer pad comprising a metal mesh-wire frame and two-ply friction element. Less heat-conducting layer of the friction element, which contains the frame pads made of composite tier-300, containing a matrix of vulcanizate rubber, powdered fillers (barite concentrate and carbon black) and a fibrous filler (asbestos). More heat-conducting layer is made of a composite material of tier-303 containing the matrix of the vulcanizate rubber, powdered fillers (barite concentrate, carbon black, oxide, graphite) and the fibrous filler (asbestos). In one block the mass of the composite tier-300 (without mass frame) is ~ 1.1 kg, the mass of the composite tier-303 ~ 1,8 kg

Another specific example of the invention is thickened shortened train a two-layer pad comprising a metal mesh-wire frame and two-ply friction element. Less heat-conducting layer pads where the frame is made of composite tier-300 and has a mass of ~ 1.2 kg (without mass frame), more heat-conducting layer of the composite tier-303 has Mljet to optimize thermal stresses in the pad during operation under conditions as high heatings, and deep cooling pads, particularly for the harsh continental climate. If the mass ratio of the composite layers is less than 1.5, when operating in cold weather increases the possibility of icing and frosting pads, contributing to the freezing of the brake Shoe, which dramatically complicates the changing needs cleaning pads and brake Assembly from the ice. In addition, the freezing pads increases the braking distance, reducing the traffic safety. The mass ratio of the composite layers greater than 2.0 significantly reduces the effect of high conductivity pads, since it increases the temperature gradient in the body of the pad, resulting in possible overheating of the friction surface and, as a consequence, the surface defects of the rolling wheels.

Brake Shoe for railway vehicles, comprising a metal frame and polymer composite friction element is made of two longitudinal layers having different conductivity, the layer which contains the frame pads, has a lower thermal conductivity, characterized in that the mass of polymer composites, made from layers selected from the relation


 

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