| 摘要 |
Ventilation losses in a hydrodynamic brake (1) are reduced by installing variable baffles (2, 20) between the rotor (3) and the stator (4). One or more baffles (2, 20) of angular cross-section have an annular leg (21) which projects radially inward. During idling, when the oil has been evacuated from the brake (11), said annular leg separates the toroidal chambers (31, 41) in their outer region. A cylindrical leg arranged in the axial direction is adjacent to the inner wall (52) of a chamber (5). When the hydrodynamic brake (1) is in operation, i.e., filled with oil, the front edge (29) of the leg (21) which projects radially inward is located behind the toroidal chambers (31, 41). If only one baffle (20) covering the entire periphery of the outer region of the toroidal chambers (31, 41) is present, the appropriate elasticity is obtained by arranging slits (23, 28) in the annular leg (21) which projects radially inward. Actuation in the radially outward and inward end position is effected by an actuating device (6, 60). One particularly advantageous embodiment comprises a piston-cylinder unit (60) with two pistons (61), a driver device on the pistons and drivers on the baffle (20). The inner position is attained by means of springs (62) and the outer position by means of the pressure of a hydraulic fluid in a pressure chamber (63) between the two pistons (61). |
