Sauer-danfoss Inc.

Sauer Gmbh

Eckhard Skirde

Vladimir Galba

Frank Ramm

Jeff Rea

Olaf Koltoff

Wilhelm Gollner

The invention relates to a mobile machine having a traction drive and working hydraulics. The drive unit has a radial piston pump which is driven by a drive set and supplies working hydraulics. The radial piston pump is arranged on the axis of the output drive shaft of the drive set, between the drive set and a gearbox which is connected thereto via the output drive shaft. The drive set, the radial piston pump and the gearbox in this case form a compact drive unit.

Hydraulic output drive shaft generator

An inclined-axis variable displacement unit has an output shaft ( ), mounted in a housing ( ) of the unit, and a cylinder block ( ), these being connected via a synchronizing articulation ( ), and via working pistons ( ) which can be displaced axially in the cylinder block ( ), the cylinder block ( ) being mounted axially in a pivoting body ( ) which can be pivoted in relation to the axis of the output shaft ( ) and has two symmetrical cylinder segments ( ) which are mounted for hydrostatic sliding action in mutually opposite concave cylindrical hollows ( ) in the inner surface of the housing ( ).

Inclined-axis variable displacement unit

An inclined-axis variable displacement unit comprises an output shaft ( ), mounted in a housing ( ), and a cylinder block ( ), the cylinder block ( ) being connected to the output shaft ( ) via a synchronizing articulation ( ), and via working pistons ( ) which can be displaced in the cylinder block ( ), the cylinder block ( ) being mounted in a pivoting body ( ) which can be pivoted in relation to the axis of the output shaft ( ) by an adjusting means, it being the case that the adjusting means is arranged on that side of the pivoting body ( ) on which the output shaft is located.

Adjusting means for an axial piston machine of inclined-axis construction

An inclined-axis variable displacement unit has an output shaft ( ), mounted in a housing ( ), and a cylinder block ( ), the cylinder block ( ) being connected to the output shaft ( ) via a synchronizing articulation ( ), and via working pistons ( ) which can be displaced in the cylinder block ( ), and the cylinder block ( ) being mounted in a pivoting body ( ) which can be pivoted in relation to the axis of the output shaft, it being the case that the pivoting body ( ) is in the form of an open vessel, and the cylinder block ( ) is arranged in the opening of the pivoting body.

Cooling arrangement for an inclined-axis variable displacement unit

A mobile work vehicle with at least one driven axle assembly is connected to and driven by just one integrated hydraulic motor. The hydraulic motor is a low-speed radial-piston motor which has a hollow shaft of which the axis of rotation is concentric with respect to the longitudinal axis of the axle assembly.

Mobile work vehicle with compact axle assembly

A control system for a variable pump and a process to control the variable pump with a circuit connected to a hydraulic motor by working lines, controlled by an electronic controller, having check valves in the circuit to allow oil flow from a charge pump going into the circuit and further consisting of high pressure relief valves to allow oil flow out of the working lines to limit maximum pressure. A temperature sensor is placed between the high pressure relief valves and the connected check valves. A signal is processed in an electronic control to control the displacement of a variable pump, depending on temperature measure of the fluid flowing across the high pressure relief valves.

Control system and method to control variable hydraulic pumps with a

A control device for variable hydraulic machines, and specifically for variable axial piston machines equipped with a servo system that is connected to a swash plate so that the discharge/displacement volume is infinitely variable. The hydraulic machine is equipped with a sensor that detects the piston displacement and is connected with an electronical control unit that controls the swash angle position of the swash plate and is pressure controlling the servo system by an electrohydraulic converter. A method for the infinite controlling of the volume flow of hydraulic machines, by which the servo system is connected to the swash plate of the hydraulic machine, and by which a conduction of a signal from a sensor to the control unit, a pressure controlling of the servo system by an electrohydraulic converter as well as the controlling of the swash angle position of the swash plate by the electronical control unit is realized.

Control device for variable hydraulic machines

A hydrostatic pump of the axial piston type having a significantly reduced overall length due to a special three point bearing arrangement for the main shaft (1) of the pump and the charge pump shaft (12). The improvement comprises a bearing assembly which consists of just three bearings (6, 14, 23) at separate locations for simultaneously supporting the coupled main shaft (1) and charge pump shaft (12). A first bearing 6 is located at the end of the main shaft (1) which is opposite that coupled to the charge pump shaft (12), a second bearing (14) is located at the end of the charge pump shaft (12) which is opposite to that coupled to the main shaft (1), and a third bearing (23) is located at the junction of the coupled shafts (1,12) to provide for their common support. The third bearing (23) can be a needle bearing or of the plain bushing type. The shafts (1,12) can be coupled by mating splines (17,22) and engage each other in a clearance fit (21).

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Aukrug-Böken, Germany

Eckhard Skirde