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 passenger restraint device of a fairground ride passenger unit, which has a passenger space, includes a position-adjustable restraint element and a lockable hydraulic adjuster which acts on the restraint element and has a cylinder-piston unit and a hydraulic accumulator. The hydraulic accumulator and the cylinder-piston unit of the hydraulic adjuster form a structural unit in that the cylinder of the cylinder-piston unit and a cylinder of the hydraulic accumulator arranged next to and parallel to the cylinder are part of an integrated cylinder assembly. The integrated cylinder assembly has a connection block with a switching plate on an axial end face, wherein the hydraulic accumulator is configured as a single unit and is detachably mounted on the switching plate.

Abstract: A preselection valve is for a hydraulic valve assembly with a switching element, a pressure input line, a first pressure output line and a first load pressure line with a load pressure inlet and output. The switching element is switchable from neutral to a first switching position. The pressure input line is connected to the first pressure output line in the first position. The preselection valve has a second and third load pressure line and a load pressure increasing device. The second load pressure line branches off the pressure input line upstream of the switching element. The load pressure increasing device is connected to the third load pressure line, which connects the pressure increasing device to the first load pressure line. The second load pressure line is connected to the pressure increasing device in the first switching position and the second load pressure line is blocked in the neutral position.

Abstract: A hydraulic component for vehicles, such as for maritime applications, is a hydraulic cylinder-piston unit. The piston of the hydraulic component has a piston rod with a measurement section. A magnetic rod in the piston rod extends over the measurement section. The magnetic rod has a helically varied magnetic field direction. The hydraulic component includes a sensor device having a scanning region measuring the field direction. The sensor device is arranged such that, over the entire stroke path of the piston, at least a part of the magnetic rod is located in the scanning region. The sensor device has a sensor unit configured to transmit measurement results for the field direction to a processing unit, configured to process and output the measurement results. Furthermore, the present invention relates to a hydraulic adjustment system having at least one hydraulic component and a vehicle having at least one hydraulic adjustment system.

Abstract: A hydraulic control system includes a first hydraulic cylinder, a second hydraulic cylinder, a fluid supply apparatus, a first control valve bank, a second control valve bank, a third control valve bank, and a first check valve. The first control valve bank is configured to independently control the first hydraulic cylinder; the second control valve bank is configured to independently control the second hydraulic cylinder; and the third control valve bank is configured to synchronously control the first hydraulic cylinder and the second hydraulic cylinder. Synchronous volume control is implemented through series connection of the hydraulic cylinders, and has quite high synchronization precision, which is measured to be up to two percent.

Abstract: A hydraulic system for a mobile rescue stretcher has a hydraulic cylinder, with first and second working chambers, a tank and pump. The first and second chambers are connected to the pump via first and second line arrangements, respectively, and can be pressurized by the pump. Hydraulic fluid flows out of the first chamber via the first line arrangement when pressure is applied to the second chamber. The first line arrangement has a first check valve which opens when pressure is applied to the second line arrangement. Hydraulic fluid flows out of the second chamber via the second line arrangement when pressure is applied to the first chamber. The second line arrangement has a first branch line connected to the pump and a second branch line connected to the tank. A pressure valve in the second branch line opens when pressure is applied to the second line arrangement.

Abstract: A housing unit for a hydraulic valve with an actuating device includes a first housing part with an internal thread and a second housing part with an external thread. A valve piston is disposed in the first housing part and an actuating element of the actuating device is disposed in the second housing part. The actuating element is operatively connected to the valve piston in the axial direction. The second housing part is only partially screwed into the first housing part in the assembled state of the housing unit. The housing unit further includes a securing device, which prevents a relative movement between the internal thread and the external thread in the assembled state of the housing unit in such a way that an operating point of the actuating device is set.

Abstract: A hydraulic component includes a component housing and a connection block. The component housing has an outer surface and an axial bore. At least one connecting channel extends from the outer surface to the axial bore. The connection block has a housing side with at least one connection bore, where the connection bore is in fluidic connection with the at least one connection channel. The outer surface of the component housing has a non-planar shape at least in the area of the at least one connecting channel, where at least one connecting bushing with a through hole is received in the at least one connecting channel and extends into the at least one connecting bore.

Abstract: A sensor unit is described for measuring parameters of a fluid, in particular a hydraulic fluid, in a fluid power unit, in particular a hydraulic power unit, as well as a fluid power unit with a sensor unit and a method for measuring parameters of a fluid in a fluid power unit. The sensor unit has a contact module and two electrode pairs with two electrodes each. The electrode pairs are connected to the contact module and the longitudinal axes of the electrode pairs are arranged essentially perpendicular to each other. This enables capacitive fluid level measurements with different orientations of the sensor unit without the need to adjust the sensor system. The additional measurement of other parameters of the fluid by means of the method efficiently allows for statements about the quality of the fluid to be made.

Abstract: A proportional hydraulic valve has a valve housing, an actuating device and a valve piston axially movable in a piston chamber of the valve housing. The valve housing has at least one pressure connection and at least one connection port. The valve piston blocks a flow path between the pressure connection and the connection port or releases it proportionally by moving the valve piston proportionally to an actuating force generated by the actuating device between a closed position and an open position. The valve piston has a first and a second spool area with a circumferential recess in the axial direction after the first and before the second spool area. The recess together with the piston chamber forms a pressure chamber and the pressure connection opens into the pressure chamber. A first diameter of the first spool area is larger than a second diameter of the second spool area.

Abstract: A hydraulic valve system has a valve housing, which has a first connection side and a second connection side. The valve housing has a through-hole for accommodating at least one piston. The valve housing has a third connection side with at least three hydraulic connections which are each connected to the through-hole via a line. The hydraulic valve system has a connection block with at least three hydraulic through-lines each extending from a first connection opening arranged on a housing side of the connection block to at least one second connection opening arranged on a hole pattern side opposite the housing side. Each of the at least three first connection openings is connected in a fluid-tight manner to one of the at least three hydraulic connections, and the second connection openings are arranged in a pre-defined hole pattern. A method for manufacturing a valve housing is also disclosed.

Abstract: A hydraulic power unit has a housing, at least one pump element, a pressure collecting plate and an electric motor. The electric motor has at least one end shield, a stator and a rotor fixed on a rotor shaft. The at least one end shield has at least one partially circumferential functional recess extending between an outer and an inner circumferential surface of the end shield in the direction of a rotor shaft bearing seat. The functional recess thus formed permits the arrangement of functional elements at a central point of the hydraulic power unit in a space-efficient manner without negatively influencing the overall size of the hydraulic power unit.

Abstract: The present disclosure refers to a modular motor pump unit having an outer housing with two open ends, two housing covers attachable to the open ends, at least one electric motor arranged in the outer housing, at least one pump element arranged in the outer housing and drivable by the electric motor, and at least one connection portion arranged externally on the outer housing. The outer housing forms a hydraulic fluid reservoir, a pressure channel extending from the pump element to the connection portion. A return channel extends from the connection portion to the inside of the outer housing. An additional housing is provided between the outer housing and at least one housing cover. A heat exchanger element is arranged in the additional housing and the return channel is connected to the additional housing and the additional housing is connected to the hydraulic fluid reservoir.

Abstract: A hydraulic valve assembly includes a first spool valve and a first selector valve for actuating a first hydraulic consumer port or a second hydraulic consumer port, and a second spool valve and a second selector valve for actuating a third hydraulic consumer port or a fourth hydraulic consumer port. A shut-off valve is arranged in a common pressure channel. A branch channel with first and second pressure branch channels branches off the pressure channel upstream of the shut-off valve. The first selector valve connects the first pressure branch channel to a first connection line in a first switching position and connects the second pressure branch channel to a second connection line in a second switching position. The second selector valve, in a first switching position, connects the first connection line to the control channel and, in a second switching position, connects the second connection line to the control channel.

Abstract: A passenger restraint device of a fairground ride passenger unit, which has a passenger space, includes a position-adjustable restraint element and a lockable hydraulic adjuster which acts on the restraint element and has a cylinder-piston unit and a hydraulic accumulator. The hydraulic accumulator and the cylinder-piston unit of the hydraulic adjuster form a structural unit in that the cylinder of the cylinder-piston unit and a cylinder of the hydraulic accumulator arranged next to and parallel to the cylinder are part of an integrated cylinder assembly. The integrated cylinder assembly has a connection block with a switching plate on an axial end face, wherein the hydraulic accumulator is configured as a single unit and is detachably mounted on the switching plate.