TRIBOLOGICAL INVESTIGATION OF ALUMINUM COMPRESSOR CYLINDER IN BRAKE SYSTEM

Abstract

Reducing the weight of the built-in parts and reducing the friction on vehicles contributes to reducing fuel consumption. The use of aluminum and its alloys has the advantage because of reducing the weight of the parts, but at the same time there is a problem due to the lower strength and poor tribological characteristics of this metal. For the purposes of investigating the tribological characteristics of the compressor in the vehicle braking system, the inner surface of the aluminum cylinder is strengthened with tribological reinforcements. Their task is to reduce friction and wear between the piston and cylinder and to increase strength of the cylinder liner. Tribological optimization was made on the basis of the measurement results of the coefficient of friction. It is confirmed that the tribological properties of the cylinder with the tribological reinforcements are better, compared to the base aluminum construction with coated or honed cylinder running surface.