Replacement Brake System for Mining Vehicles

A new wheel-end brake from MICO, designed for installation on vehicles used for underground and surface mining applications, is claimed to provide a significant alternative to standard OEM brake systems that may wear and corrode in severe operating conditions. The new brake is intended to retrofit standard caliper disc and drum brakes found on most Class 1 and 2 vehicles (GVW less than 10,000 lb). The brake is completely enclosed and selfcontained to reduce costs, as the need for maintenance throughout the vehicle’s life cycle is sharply reduced, according to the manufacturer. The wet-type multiple disc brake features a spring-applied, hydraulic release design for parking and emergency braking and is equipped with a pressure override function for regular service braking. Maximum static torque rating for the parking/emergency brake function is 40,000 in.-lb at 0 psi, while the service brake override has a maximum dynamic torque rating of 30,000 in.-lb at 1,500 psi. At maximum torque, the brake has an initial release pressure of 500 psi and full release pressure of 600 psi. The springapplied section of the brake requires 1- to 2-in.2 of oil, while between 0.23 and 0.46 in.2 of oil is needed for the service brake section—considerably less than other systems require.

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