The present invention relates to a crane, particularly a crawler crane, whereby at least two different drive units can be alternately connected with the crane. The invention is additionally directed at corresponding drive units.

Lifting system (1) for mounting on a loading surface of a vehicle (3), comprising at least one first lifting arm system (4) on one side of the loading surface in the transverse direction of the vehicle (3) and at least one second lifting arm system (5) on the other side of the cargo area in the transverse direction of the vehicle (3). The lifting arm systems (4, 5) comprises at least one foundation (6) with which the respective lifting arm system (4, 5) is connected to the vehicle (3), The lift arm systems (4, 5) each comprise at least one lifting arm (9) and at least one operating mechanism (15). The lifting device (1) comprises at least one lifting boom (13) extending between the lifting arm (9) in the first lifting arm system (4) and the lifting arm (9) in the second lifting arm system (5), The operating mechanism (15) is operated with at least one actuator (27). The actuating mechanism (15) comprises at least one first operating arm (16), which is rotatably connected at one end, or end thereof, to the base (6) and at its other end, or its proximity is connected to the lifting arm (9) via at least one arm link (22). The operating arm (16) and the arm link (22) are pivotally connected to each other and the arm link (22) is pivotally arranged relative to the lifting arm (9). The operating mechanism (15) further comprises at least one operating link (25) which is pivotally connected to the operating arm (16).

Lifting system (1) for mounting on a loading surface of a vehicle (3), comprising at least one first lifting arm system (4) on one side of the loading surface in the transverse direction of the vehicle (3) and at least one second lifting arm system (5) on the other side of the cargo area in the transverse direction of the vehicle (3). The lifting arm systems (4, 5) comprises at least one foundation (6) with which the respective lifting arm system (4, 5) is connected to the vehicle (3), The lift arm systems (4, 5) each comprise at least one lifting arm (9) and at least one operating mechanism (15). The lifting device (1) comprises at least one lifting boom (13) extending between the lifting arm (9) in the first lifting arm system (4) and the lifting arm (9) in the second lifting arm system (5), The operating mechanism (15) is operated with at least one actuator (27). The actuating mechanism (15) comprises at least one first operating arm (16), which is rotatably connected at one end, or end thereof, to the base (6) and at its other end, or its proximity is connected to the lifting arm (9) via at least one arm link (22). The operating arm (16) and the arm link (22) are pivotally connected to each other and the arm link (22) is pivotally arranged relative to the lifting arm (9). The operating mechanism (15) further comprises at least one operating link (25) which is pivotally connected to the operating arm (16).

The invention relates to a transport system for vertically transporting goods and persons on an above-ground construction site, comprising a stewing tower crane (40, 300) and at least one construction elevator (10), wherein the stewing tower crane and the at least one construction elevator have shared anchoring (12) and are anchored or can be anchored jointly to a structure (30) by means of said anchoring.

The invention relates to a transport system for vertically transporting goods and persons on an above-ground construction site, comprising a stewing tower crane (40, 300) and at least one construction elevator (10), wherein the stewing tower crane and the at least one construction elevator have shared anchoring (12) and are anchored or can be anchored jointly to a structure (30) by means of said anchoring.

A vehicle frame and a mobile crane having such a vehicle frame includes a first frame part and a second frame part which can be detachably connected to each other via a common interface. The interface includes multiple points at which it is bolted to bolting elements assigned to the respective frame parts. The interface also includes at least one profile along which it engages with engaging elements assigned to the respective frame parts which, when the bolting elements are aligned with each other, are in a mutually positive-fit engagement across their extent.

A vehicle frame and a mobile crane having such a vehicle frame includes a first frame part and a second frame part which can be detachably connected to each other via a common interface. The interface includes multiple points at which it is bolted to bolting elements assigned to the respective frame parts. The interface also includes at least one profile along which it engages with engaging elements assigned to the respective frame parts which, when the bolting elements are aligned with each other, are in a mutually positive-fit engagement across their extent.

A hydraulic steering system, comprising a steering pump and a plurality of digital steering cylinder assemblies. Each digital steering cylinder assembly includes a steering cylinder and a digital hydraulic valve configured to selectively communicate a rodless cavity of the steering cylinder with one of the steering pump and a return oil circuit, and communicate a rod cavity of the steering cylinder with the other of the steering pump and the return oil circuit. A controller can be configured to emit a digital pulse signal to a motor and cause the digital hydraulic valve to move towards a first working position or a second working position. A mechanical feedback structure can be configured to be driven by a piston rod of the steering cylinder when the valve core of the digital hydraulic valve moves towards the first working position or the second working position, so as to drive the digital hydraulic valve to return to a neutral position. The system can improve the control precision and the response speed of the steering system.

A hydraulic steering system, comprising a steering pump and a plurality of digital steering cylinder assemblies. Each digital steering cylinder assembly includes a steering cylinder and a digital hydraulic valve configured to selectively communicate a rodless cavity of the steering cylinder with one of the steering pump and a return oil circuit, and communicate a rod cavity of the steering cylinder with the other of the steering pump and the return oil circuit. A controller can be configured to emit a digital pulse signal to a motor and cause the digital hydraulic valve to move towards a first working position or a second working position. A mechanical feedback structure can be configured to be driven by a piston rod of the steering cylinder when the valve core of the digital hydraulic valve moves towards the first working position or the second working position, so as to drive the digital hydraulic valve to return to a neutral position. The system can improve the control precision and the response speed of the steering system.

The invention relates to a construction- and/or material-handling machine such as a crane, excavator or tracked vehicle, comprising an internal combustion engine that drives one or more energy-consuming devices such as a pump, winch, actuator for a structure or working-unit drives of the construction- and/or material-handling machine via a mechanical drive train. According to the invention, an electric drive for driving the mechanical drive train is provided and can be engaged by means of a clutch and decoupled from the mechanical drive train.