Device for switching off the supply of hydraulic fluid for a single-acting hydraulic cylinder for tilting the loading surface of a vehicle when the tilting limit position is reached

摘要

A device for switching off the supply of hydraulic fluid for a preferably single-acting hydraulic cylinder serves to tilt the loading surface of the vehicle. When the tilting limit position is reached, the hydraulic cylinder is switched off, a shut-off valve being present in the feed line to the cylinder and a control component which closes the shut-off valve when the tilting limit position is reached being present and having a release device which initiates the tilting back. The control component (9) is controlled by the swivel angle between the cylinder (5) and the chassis of the vehicle and interrupts a control line (19), which opens into the supply line (7), when the tilting limit position is reached. The shut-off valve and the release device are constructed as one component (17). The latter has an annular valve seat (21) arranged in it, a slide (22) which is displaceably arranged on one side of said seat and pressed under the force of a spring, an annular space (24) which adjoins the valve seat, around the slide (22) which in its area has a smaller diameter than in its rear area. In addition, a port (25) which opens into the annular space (24) and can be connected to the supply line (7) is provided and the annular space (24) has a sealed cavity (26) in the slide (22) which is provided on its side facing the valve seat (21) with an inlet port (27). In addition, an outlet port (20) is provided which opens in the cavity (26) and can be connected to the control line (19), it being possible to connect to the supply line (7) the free space (23) which adjoins the valve seat (21) and is in opposition with respect to the slide (22). IMAGE