Cnh Baumaschinen Gmbh

Cnh America LLC

O&k Orenstein & Koppel Aktiengesellschaft

Technische Universitát Dresden

Thomas Magnete Gmbh

Jürgen Weber

Monika Marianne Ivantysynova

Erik Lautner

Robert Rahmfeld

Troy D Bateman

Renato Gianoglio

Michael Sylvester Bares

Olaf Ohligschlager

Claudia Supparo, Legal Representative

Jarrod A Lemire

Olaf Ohligschläger

Thomas Neubert

Jörg Grabbel

Helmut Renner

Manfred Kurde

Martin Petzold

Regis Bellanger

Axel Müller

Frediani Salvatore

Thomas Kramer

Volker Bösebeck

Axe MÜLLER

The invention relates to a control arrangement for vehicles having a hydrostatic auxiliary drive for one or more axles, in particular for motor graders, having a drive engine, driven rear wheels coupled to the drive engine, further wheels which can be activated by associated hydraulic motors and can be operated by a hydraulic pump coupled to the drive engine and which has an adjustable feed volume, wherein each wheel is connected to a hydraulic motor without a clutch. The hydraulic pump and the hydraulic motors can be activated electrically and adjusted in a continuously variable fashion and the hydraulic pump is connected directly, without valves, to the hydraulic motors in parallel by hydraulic lines. The control device controls the respective displacement volume of the hydraulic motors only as a function of the rotational speed signals of the sensors.

Control arrangement for vehicles having a hydrostatic auxiliary drive

A controller of an electromagnetically driven reciprocating pump influences velocity of the magnetic armature by switching voltage applied to the electromagnet depending on the position of the magnetic armature, its position determined from state variables of the electromagnet. A processor calculates electrical resistance of the magnetic coil from the voltage and current measured by the measuring device, and calculates the temporal change of the linked magnetic flux in the electromagnet from the electrical voltage, the current and the resistance of the magnetic coil, and calculates the linked magnetic flux in the electromagnet from an earlier magnetic flux and from the temporal change, and determines the position of the magnetic armature from the linked magnetic flux in the electromagnet and the electrical current through the magnetic coil, and switches the voltage at the magnetic coil by the switching device depending on the position of the magnetic armature.

Method for controlling a reciprocating piston pump and device for carrying out the method

A hydraulic steering device for vehicles, especially construction machines, with which is simple and robust mechanically and can be precisely controlled, without possessing the disadvantages of the current state of the art. A hydraulic swivelling motor for producing the steering motion, which is connected to a variable flow rate pump with reversal of its direction of delivery.

Hydraulic steering device for vehicles

A work vehicle includes a frame and an axle assembly coupled to the frame, including a first axle shaft substantially disposed in an axle housing. A first wheel couples to the first axle shaft of the axle assembly. An axle lubricating fluid is disposed within the axle housing. A cooling circuit fluidly coupled to the axle assembly circulates cooling fluid therethrough. A hydraulic motor fluidly coupled to a fluid circuit includes a device disposed in parallel with the fluid circuit to discontinue operation of the motor in response to a predetermined pressure of at least one of the first and second circuit being exceeded.

External axle cooling system

The invention relates to a method and a device for damping the displacement of construction machines, in particular wheel loaders, comprising working equipment that is driven by means of a hydraulic cylinder, a hydraulic source, a controlled valve for supplying the hydraulic cylinder with hydraulic fluid, a regulator unit comprising control software, in addition to an acceleration sensor.

Method and device for damping the displacement of construction machines

The invention concerns a hydraulic system for linear drives with a differential cylinder, in particular for mobile machines which through the use of displacement-control of the drives avoids the many and diverse disadvantages of the state of the art and renders possible a precise and energy-efficient control of linear drives with differential cylinders, and which is economical and simple to maintain and which can be well integrated into the total hydraulic system of such machines.

Hydraulic system for linear drives controlled by a displacer element

The invention relates to a hydraulic control system for building machinery, particularly for controlling hydraulic consumers of an excavator. According to the invention, pump channels which ensure that the hydraulic consumers are supplied in parallel by means of a spool valve of the main control unit of the piece of building machinery are provided in addition to previously existing pump channels that ensure said hydraulic consumers are serially supplied with hydraulic fluid. The additional pump channels are arranged parallel to the previously existing ones.

Hydraulic control system for construction vehicle, particularly excavators

A method is described for controlling a hydraulic system, particularly of mobile working machine, with at least one internal combustion engine driving at least one hydraulic pump with adjustable volumetric displacement and possibly additional fixed-displacement pumps.

Method for controlling a hydraulic system of a mobile working machine

With a hydrostatic multi-motor drive unit with a least two hydraulic motors acting upon a common load, a solution should be created, with which a further operating range is covered by the use of several motors and at the same time a simple as possible and problem free coupling of the motors is assured. Furthermore, a method for controlling the drive unit is indicated, which permits continuous transitions between the different operating ranges. This is achieved in that the motors () are connected with each other through at least one freewheel device (), in which the motor () arranged after the freewheel device has a variable displacement volume.

Hydrostatic multi-motor drive

The invention relates to a control device for controlling machines, especially hydraulic machines, by hand or foot. The inventive device comprises an actuating element (), especially a pedal or a control lever, which can be moved in several directions. The aim of the invention is to feel a resisting force when the actuating element () is displaced or adjusted, whereby said force is on the scale of hydraulic forces having a direct effect. The actuating element () engages with a transmitter device () which is not hydraulic or is hydraulically decoupled from the hydraulic system. A damping device () engages with the actuating element (). Said damping device defies the movement in at least one direction of motion pertaining to the actuating element () by means of a fluid that is moved by the actuating element ().

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Dresden, Germany

Jürgen Weber