Abstract: A hydraulic power trim lift device for a marine propulsion system has at least one lift cylinder, at least one pump and a tank. The lift cylinder has a lift piston chamber and a lift rod chamber separated from the lift piston chamber by a lift cylinder piston. The pump is connected to the lift rod chamber via a first line arrangement and to the lift piston chamber via a second line arrangement. The lift piston chamber is connected to the tank via the second line arrangement when the first line arrangement is pressurized. The second line arrangement has a flow control device acting in the direction of flow to the tank. Furthermore, a marine propulsion system with such a power trim lift device is provided.

Abstract: A hydraulic trim device is provided for a boat motor with at least one trimming cylinder, a piston rod movable axially in the trimming cylinder between a first end position and a second end position, a trimming plate and a hydraulic unit. The trimming cylinder can be pressurized via the hydraulic unit to extend the piston rod. The piston rod has a contact portion and the trimming plate has an contact surface and the contact portion is in contact with the contact surface. The contact portion moves along the contact surface when the piston rod moves between the first end position and the second end position relative to the contact surface. The contact surface at least partially has a convex curvature in the direction of the piston rod. A boat motor with a hydraulic trim device and to a boat with such a boat motor are also provided.

Abstract: A boat drive hydraulic steering unit has a steering cylinder unit, pump and tank. The cylinder unit has a first chamber, piston and second chamber. The pump is connected to the first and second chambers by respective first and second line. The first chamber is connected to the tank via the first line arrangement when the second chamber is pressurized, by the first line arrangement having a first check valve which opens when the second line arrangement is pressurized. The second chamber is connected to the tank via the second line arrangement when the first chamber is pressurized, by the second line arrangement having a second check valve which opens when the first line arrangement is pressurized. The first and second line arrangements have respective first and second throttling devices acting in the direction of flow towards the tank. A boat drive may include the steering unit.

Abstract: A hydraulic power trim lift device for a marine propulsion system has at least one lift cylinder, at least one pump and a tank. The lift cylinder has a lift piston chamber and a lift rod chamber separated from the lift piston chamber by a lift cylinder piston. The pump is connected to the lift rod chamber via a first line arrangement and to the lift piston chamber via a second line arrangement. The lift piston chamber is connected to the tank via the second line arrangement when the first line arrangement is pressurized. The second line arrangement has a flow control device acting in the direction of flow to the tank. Furthermore, a marine propulsion system with such a power trim lift device is provided.

Abstract: In a motor vehicle chassis, at least one wheel suspension, which comprises a spring in the form of a coil spring, has associated therewith a hydraulic height adjustment device having a cylinder-piston arrangement which acts on a base point of the coil spring. The cylinder-piston arrangement can be supplied by a decentral hydraulic aggregate which is associated with the relevant wheel and comprises a storage container for hydraulic fluid and a hydraulic pump driven by an electric motor. At least the electric motor of the hydraulic aggregate is situated within the coil spring.

Abstract: In a motor vehicle chassis, at least one wheel suspension, which comprises a spring in the form of a coil spring, has associated therewith a hydraulic height adjustment device having a cylinder-piston arrangement which acts on a base point of the coil spring. The cylinder-piston arrangement can be supplied by a decentral hydraulic aggregate which is associated with the relevant wheel and comprises a storage container for hydraulic fluid and a hydraulic pump driven by an electric motor. At least the electric motor of the hydraulic aggregate is situated within the coil spring.

Abstract: An arrangement for hydraulic actuation of a movable component on vehicles, particularly a vehicle top, trunk lid, a cover or the like, includes at least one double-action working cylinder (1) whose working chambers are connected to a pressure source (5) via a pressure line (4) or whose working chambers are at least temporarily connectable thereto through a switching valve (11).