| 摘要 |
Device for pressure cut-off in the terminal positions of the angle of deflection of a power-assisted steering system. In steering gears in which a working piston (2) slides in a steering system, this cut-off device is lodged in a through bore (17) of the working piston (2). A cut-off valve (20, 22 or 21, 23) actuated by a tappet (24 or 25) against a wall (30 and 31) is provided for each steering direction. To avoid time-consuming adjustments to the cut off valves (20, 22; 21, 23), the walls (30 and 31) contain sockets (32 and 33) opposite the tappets (24 and 25) which can be automatically inserted in terminal positions corresponding to the angle of the steering wheel, after the power-assisted steering has been mounted in the vehicle. For this purpose, the sockets (32, 33) are premounted in their respective bores (26, 27) and the steering is then actuated, at first without assistance, against the wheel stops, the front axle being previously mounted on a trestle. The sockets (32 and 33) are inserted by the working piston (2) for a predetermined distance (a) at which the hydraulic force is cut off. As the lengths of the tappets (24 and 25) of the cut-off valves (20, 22: 21, 23) exceed the depth(s) of the bore of the sockets (32 or 33) by a quantity (x), the hydraulic force is cut off just before the wheel stops are reached. |
