AUTOMATIC LOAD DEPENDENT COMPRESSED AIR BRAKE SYSTEM

摘要

An automatic compressed air brake system for a vehicle the operation of which is dependent on the vehicle load includes brake cylinders for an unladen and for a loaded vehicle connected to a common spring restored actuating linkage. The load brake cylinder is connected to a pressure transmitter controlled by the vehicle load and the unladen brake cylinder pressure. A pressure limiting valve is connected to a control valve connected to the main brake line to control the charging of the load brake cylinder. This device generates an initial pressure for overcoming the restoring force of the linkage irrespective of vehicle load. Means are provided to relax the pressure in the load brake cylinder after the brake has initially responded. These means can exhaust the load brake cylinder and are controlled by the load brake cylinder pressure. The means disclosed are a hollow tappet in the limiting valve which is coupled by a lost motion coupling to a piston subject to the load brake cylinder pressure.