Disc Brake with Two Thermally Insulated Friction Units with Different Frictional Properties

The study considers the principles of creating a disc brake, promoting consistently high friction in a wide range of brake temperatures. The selection of friction materials for thermally insulated friction units is carried out according to the principle of mutual compensation of the negative properties of one friction unit due to the positive properties of another one. For example, for a cast iron–35GS steel disc brake, when heated to 300°C, the friction coefficient changes from 0.38 to 0.17, while for a carbon–35GS steel disc brake, the reverse effect of a coefficient variation from 0.17 to 0.58 is observed. A combination of the given tribological systems provides an acceptably high friction coefficient in the entire brake temperature range. A disc brake with two heat-insulated friction units makes it possible to improve the rolling stock braking efficiency. The cost of the new disc brake (compared to a disc brake based on a composite carbon–carbon friction material) is expected to be lower by about 30%.