Abstract: The present invention relates to a device for detecting leaks in a hydraulic cylinder, comprising: a first pressure sensor for detecting a pressure value in a first pressure chamber of a hydraulic cylinder, a second pressure sensor for detecting a pressure value in a second pressure chamber of the hydraulic cylinder, an evaluation unit for continuously detecting the pressure values of the first pressure sensor and the second pressure sensor, the evaluation unit being designed to detect a leak, preferably an internal leak, in the hydraulic cylinder that deviates from the norm based on the pressure values recorded by the first pressure sensor and the second pressure sensor.

Abstract: The invention relates to a wind energy system with at least one pitch adjustment system for adjusting the pitch of at least one rotor blade of the wind energy system, wherein the pitch adjustment system comprises at least one electrohydraulic drive that comprises an unregulated electromotor rotating in one direction of rotation for generating pressure.

Abstract: The present invention discloses an implement, in particular an excavator or a machine for material handling, with an element movable via at least one working drive, wherein at least one energy recovery cylinder is provided for energy recovery from the movement of the movable element, which includes a chamber filled with gas. In accordance with the invention, a device for adjusting the temperature of the energy recovery cylinder is provided.

Abstract: The present invention relates to an implement, in particular an excavator or a machine for material handling, with an element movable via at least one working drive, wherein at least one energy recovery cylinder is provided for energy recovery from the movement of the movable element, which includes a chamber filled with gas. The energy recovery cylinder is equipped with a heat exchanger.

Abstract: The present invention relates to a working device having an element movable via at least one working cylinder, with at least one energy recovery cylinder being provided for recovering energy from the movement of the movable element and having a chamber filled with gas. In this respect, the chamber filled with gas is in operative communication with a pressure store which counters a pressure increase in the chamber filled with gas at least from a maximum pressure onward.

Abstract: The present invention relates to a working device having an element movable via at least one working drive, with at least one energy recovery cylinder being provided for recovering energy from the movement of the movable element and having a chamber filled with gas. In this respect, the energy recovery cylinder has a sealing arrangement for sealing the chamber filled with gas which includes an annular space filled with oil.

Abstract: The invention relates to a wind energy system with at least one pitch adjustment system for adjusting the pitch of at least one rotor blade of the wind energy system, wherein the pitch adjustment system comprises at least one electrohydraulic drive that comprises an unregulated electromotor rotating in one direction of rotation for generating pressure.

Abstract: The present disclosure relates to a piston-cylinder unit with a device for determining position, the device comprising at least one exciter that is indirectly or directly electrically connected with the cylinder jacket and the cylinder piston of the piston-cylinder unit, and that excites the electrical oscillating circuit formed by the piston-cylinder unit and the contact lines to oscillate at its resonant frequency, it being possible to measure an electrical signal characterizing the resonant frequency on the piston-cylinder unit. The invention also relates to a construction machine or piece of hoisting equipment with such a piston-cylinder unit.

Abstract: The present invention relates to a piece of working equipment, in particular to an excavator or to a machine for the transfer of material, having an element movable via at least one working hydraulic cylinder, wherein at least one energy recovery hydraulic cylinder is provided for the recovery of energy from the movement of the movable element. In accordance with the invention, the energy recovery hydraulic cylinder is filled with gas at the bottom side and has a hollow piston rod.

Abstract: The present invention relates to a tool for screwing a piston onto the piston rod of a hydraulic cylinder, in particular of a hydraulic cylinder with a piston diameter of more than 200 mm, comprising a first tool element with connecting elements for releasable connection with the piston and a second tool element with connecting elements for releasable connection with the piston rod, which is rotatable with respect to the first tool element, wherein the torque necessary for screwing together piston and piston rod can be applied onto the piston and the piston rod via the connecting elements by rotating the first tool element against the second tool element.

Abstract: The present invention discloses an implement, in particular an excavator or a machine for material handling, with an element movable via at least one working drive, wherein at least one energy recovery cylinder is provided for energy recovery from the movement of the movable element, which includes a chamber filled with gas. In accordance with the invention, a device for adjusting the temperature of the energy recovery cylinder is provided.

Abstract: The present invention relates to a working device having an element movable via at least one working drive, with at least one energy recovery cylinder being provided for recovering energy from the movement of the movable element and having a chamber filled with gas. In this respect, the energy recovery cylinder has a sealing arrangement for sealing the chamber filled with gas which includes an annular space filled with oil.

Abstract: The present invention relates to an implement, in particular an excavator or a machine for material handling, with an element movable via at least one working drive, wherein at least one energy recovery cylinder is provided for energy recovery from the movement of the movable element, which includes a chamber filled with gas. The energy recovery cylinder is equipped with a heat exchanger.

Abstract: The present disclosure shows a working apparatus, in particular an excavator or a machine for material handling, having an element movable via at least one hydraulic working cylinder, wherein at least one energy recovery cylinder is provided for recovering energy from the movement of the movable element, said energy recovering cylinder being filled with gas at the base side and having an annular space filled with a medium. In this respect, a flow restricting element is provided which restricts the flow of the medium from the annular space on a sudden moving out of the piston rod.

Abstract: The present invention relates to a working device having an element movable via at least one working cylinder, with at least one energy recovery cylinder being provided for recovering energy from the movement of the movable element and having a chamber filled with gas. In this respect, the chamber filled with gas is in operative communication with a pressure store which counters a pressure increase in the chamber filled with gas at least from a maximum pressure onward.

Abstract: The present disclosure relates to a piston-cylinder unit with a device for determining position, the device comprising at least one exciter that is indirectly or directly electrically connected with the cylinder jacket and the cylinder piston of the piston-cylinder unit, and that excites the electrical oscillating circuit formed by the piston-cylinder unit and the contact lines to oscillate at its resonant frequency, it being possible to measure an electrical signal characterizing the resonant frequency on the piston-cylinder unit. The invention also relates to a construction machine or piece of hoisting equipment with such a piston-cylinder unit.

Abstract: The invention relates to a hydraulic cylinder piston comprising a piston rod and a piston connected thereto. In accordance with the invention, the piston can be tensioned with respect to the piston rod via a screw system comprising two threaded rings, with the inner threaded ring of the two threaded rings comprising a removable tensioning element for the application of the pre-tension and with the outer threaded ring being movable relative to the inner threaded ring.

Abstract: The present invention relates to a tool for screwing a piston onto the piston rod of a hydraulic cylinder, in particular of a hydraulic cylinder with a piston diameter of more than 200 mm, comprising a first tool element with connecting elements for releasable connection with the piston and a second tool element with connecting elements for releasable connection with the piston rod, which is rotatable with respect to the first tool element, wherein the torque necessary for screwing together piston and piston rod can be applied onto the piston and the piston rod via the connecting elements by rotating the first tool element against the second tool element.

Abstract: The present invention relates to a piece of working equipment, in particular to an excavator or to a machine for the transfer of material, having an element movable via at least one working hydraulic cylinder, wherein at least one energy recovery hydraulic cylinder is provided for the recovery of energy from the movement of the movable element. In accordance with the invention, the energy recovery hydraulic cylinder is filled with gas at the bottom side and has a hollow piston rod.

Abstract: The invention relates to a hydraulic cylinder piston comprising a piston rod and a piston connected thereto. In accordance with the invention, the piston can be tensioned with respect to the piston rod via a screw system comprising two threaded rings, with the inner threaded ring of the two threaded rings comprising a removable tensioning element for the application of the pre-tension and with the outer threaded ring being movable relative to the inner threaded ring.