PARKING BRAKE DEVICE OF A RAILWAY VEHICLE HAVING HIGH EFFICIENCY

摘要

The invention relates to a brake device of a railway vehicle, comprising at least one operating brake cylinder (10) having at least one operating brake piston (4) actuated by a pressurizing medium, said piston actuating an operating brake piston rod (6) coaxial to the brake cylinder axis (12), and having a parking brake device having a pivotally supported actuating lever (20), the rotary motion thereof being transmitted to a shaft (24) rotationally supported by at least one shaft bearing (22) on a housing (18), wherein the rotary motion of the shaft (24) induced by the actuating lever (20) can be converted to a linear motion parallel to the brake cylinder axis (12) of at least one support roller (42) rotationally supported by a support roller bearing (44) on a rotary axis (76) disposed parallel to the shaft (24), in that at least one cam (50) having an operating cam face (52) and rotationally fixed to the shaft (24) is provided, said cam interacting with a radially outer support roller surface (54) of the support roller (42) during a tightening or releasing stroke of the parking brake device, wherein the linear motion of the support roller (42) is transferred to the operating brake piston rod (6). According to the invention, the operating cam face (52) is designed as a circumferential segment of a cylinder surface, the center axis (66) thereof executing a circular motion path (68) about the shaft axis (70) of the shaft (24) during a tightening or releasing stroke of the parking brake device, wherein an intersection point (72) of said motion path (68) and the brake cylinder axis (12) exists that is substantially associated with a maximum parking brake force.