Braking block

FIELD: automotive industry.

SUBSTANCE: braking block comprises metallic frame and friction lining secured to the frame with a glue. The mass of the glue layer relates to the mass of the friction lining as 1:100-1:150.

EFFECT: enhanced reliability.

 

The invention relates to the brake pads for various vehicles, mainly to the brake pads drum and disc brakes of the vehicle.

Analogous to the claimed invention is a brake pad, comprising a metal frame and secured it with glue friction pad (see Reference science in tribology. Tom. 3, Meters: machinery, 1992, s-364). The essential features of similar "metal frame, fixed it with glue friction strap" match the essential features of the claimed invention.

The disadvantage of analogue is the reduction of strength properties of adhesive joints under impact loads (vibration) and thermal effects (overheating and cooling), resulting from frictional contact pads and counterface under conditions of environmental change in the actual use of the product, due to the lack of balance between the weight of the adhesive layer, generally which is a heat insulator, and the mass of the friction lining, which has, as a rule, the higher the conductivity.

The prototype of the claimed invention is a brake pad, comprising a metal frame and fixed on it by means of a heat-resistant adhesive friction pad, etc the thickness of the adhesive layer is correlated with the thickness of the friction linings as ˜ 1:16 (see Marcon. Style professionals. Disc brake pads. Yaroslavl, "printing", 2003, p.6). The essential features of the prototype metal frame, fixed to it by means of a heat-resistant adhesive friction strap" match the essential features of the claimed invention.

The disadvantage of the prototype is excessive thickness of the adhesive layer that secures the cover (the ratio of the layer and the pads on the mass of the difference in density ˜1:25÷1:30). In the adhesive layer composed mainly of a polymeric binder and has therefore a very low thermal conductivity, prevents the transfer of heat from the friction lining to the metal frame and strongly heated. Due to possible thermal decomposition of the adhesive and reduce the mechanical strength of adhesive joints, which can lead to reduced performance of the product under conditions of shock loads and vibrations during operation.

The task, which is aimed by the invention is the improvement of the operational characteristics of the pad by increasing the heat transfer from the friction lining to the frame and lowering the temperature of the adhesive layer due to the relative weight of the adhesive compared to the mass of the friction lining.

To achieve the technical result in the brake is th block, includes metal frame and fixed on it by means of a heat-resistant adhesive friction pad, the weight of the adhesive layer is correlated with the mass of the friction lining 1:100÷1:150.

The essential features of the claimed invention "weight of the adhesive layer is correlated with the mass of the friction lining 1:100÷1:150 ' are different from the characteristics of the prototype.

Brake pad includes a metal frame in various forms. For example, pads of disc brakes usually have a flat metal frame different configuration, pads drum brakes typically have a frame with a T-shaped cross section in the form of a cylindrical shell, etc. of the Friction lining is usually of friction polymer composite comprising a polymer matrix and various dispersed (including fiber) fillers. The plate is fixed on the surface of the frame by placing between the frame and the cover layer of adhesive having adhesive properties to the metal frame and the composite overlay. As such adhesives can be used adhesives VK-1, VK-2, SU-10T, VK-AM and other the mass of the adhesive layer is correlated with the mass of the friction lining 1:100 to 1:150.

Be made of the inventive pad can by known methods, for example, the combination of a metal surface is of Arkasa, which is applied to the adhesive, with the corresponding surface of the friction lining with a subsequent heat treatment.

A concrete example of the claimed invention are pads drum brake cars VAZ-2101, VAZ-2108. The mass of the friction linings ˜109 g and ˜71, respectively. Apply glue SU-10T, holding temperature (curing) 180°S, the exposure time is 1 hour. The mass ratio of the adhesive and lining 1:114 1:109, respectively.

Using the stated ratio between the masses of the adhesive and friction lining can effectively dissipate the heat generated during frictional contact from the pad to the frame. If the mass ratio of the adhesive and lining will be more than 1:150, the heat will be even more effective, however, the amount of glue will be sufficient to provide bonding as a result of filling glue roughness on the surface of the metal frame and, in particular, the friction (roughness provide an increase in the adhesive surfaces of the frame and pads). The result can be formed unsized place and the strength of adhesive joints is reduced. The mass ratio of the adhesive and lining < 1:100 adhesive layer becomes thick enough to prevent efficient heat transfer and possible overheating as Ricci is authorized lining, and, accordingly, adhesive bonding with the inevitable decomposition of the polymer. As a result, the strength of adhesive joints is also reduced.

Brake pad comprising a metal frame and secured it with glue friction pad, characterized in that the mass of the adhesive layer is correlated with the mass of the friction lining 1:100÷1:150.



 

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