Abstract: A bearing arrangement includes a shaft with an outer circumferential supporting surface, and a mounting device with an inner circumferential supporting surface. The mounting device supports the shaft in a rotatable manner using a bearing structure. At least one tiltable sleeve member is arranged between at least one of the supporting surfaces and the bearing structure.

Abstract: A selective flow hydraulic gear pump has an integral unit with a front pump section and a rear pump section. The front pump section has a pumping gear set, gear plate, and bearing plate housing. The rear pump section has a pumping gear set, gear plate, and cover housing. The integral unit has an inlet port common to both the bearing plate housing and the cover housing. Check valves and solenoid operated control valves are contained within the bearing plate housing and the cover housing and are associated with a first fluid conduit. A second fluid conduit is in communication with and extends between the bearing plate housing an outlet port in the cover housing.

Abstract: A power converter is provided with a totem-pole power factor correction (PFC) circuit for bridgeless line rectification, and current sensing circuit that can be selectively disabled to reduce unwanted current sense signal components and undesirable current transformer voltage stresses. The totem-pole PFC has at least a first leg with first and second switching elements coupled in series. A PFC inductor is coupled between an AC input on a first end and a node between the switching elements. The current sensing circuit includes a first transformer winding coupled in series with the first switching element, a second transformer winding magnetically coupled to the first winding and configured to deliver current from the first winding to a current sense terminal during an active phase for the first switching element, and a shunt circuit configured to disable the current sensing circuit during a freewheeling phase for the first switching element.

Abstract: A method is provided of operating a resonant converter, the converter having a controller and power stage and providing an output voltage, by determining a characteristic frequency of the power stage. The characteristic frequency is defined as a natural oscillation frequency of the power stage observed right after the power stage control signals from the controller are disabled. The converter is operated at the characteristic frequency during ramp-up or ramp-down of the converter output voltage and/or during overload or input overvoltage conditions.

Abstract: A variable load sense spring setting for an axial piston open circuit having three subsystems. A backstepping control applied to the first and second subsystems to determine an operator control input and a load sense spool effective open area control input that stabilize the first and second subsystems. The calculating a feasible load sense area from the third subsystem and the control inputs.

Abstract: A commutation current steering method is provided for a power converter having an isolation transformer, a plurality of primary ZVS switches, a plurality of secondary switches for synchronous rectification, and a boosting resonant circuit. A commutation current is shared between all of the switches, and a resonance is induced in the boosting resonant circuit by controlling each of the synchronous rectifier switches to turn off at a time prior to a turn-off time for a corresponding one of the switches operating under ZVS conditions, wherein the primary current is boosted above a minimum commutation value during ZVS periods. The ZVS switches are further driven with a constant dead time, and the synchronous rectifier switches are driven to provide a fixed time relation with respect to all of the switches.

Abstract: A servo piston assembly having a servo piston body mounted within a servo piston cylinder. A pair of bushings are mounted within each end of the servo piston body. An elongated bore extends through the servo piston body and receives a guide rod that extends out of the servo piston body and is received within the servo piston cylinder.

Abstract: A wireless sensor assembly that includes a battery pack and a wireless sensor. The battery pack is placed in spaced relation to the wireless sensor and inductively powers the wireless sensor utilizing primary and secondary resonant coils presented within the battery pack and wireless sensor. The wireless sensor additionally has super capacitors therein to continue to operate the wireless sensor during the changing of the battery pack.

Abstract: A low profile (1U) power distribution system includes a power shelf assembly having a first side and an opposing second side. First and second bus bars extend across the assembly and substantially in parallel with the first and second sides, the second bar positioned behind the first bar. One row of power supply pins extends from the bars to engage power supply units within the assembly. A first set of pins extends from the first bus, while a second set extends from the second bar and protruding through respective apertures in the first bar. An insulating material may be provided to electrically insulate power supply pins of the second bar from the first bar. The reduced height profile of the bars allows for cooling air to pass through the remaining >50% of the assembly, which may now desirably include additional electrical circuits within the cooling channel.

Abstract: An electrical pressure control load sense system having a pump connected inline to an operator control spool valve and a compensation circuit. The system also has a plurality of sensors, at least one pressure transducer, a micro-processor, a fixed orifice, a proportional pressure relief valve, and a swashplate angle sensor.

Abstract: A hydraulic control system for steering rear caster wheels of a work machine. The control system has a steering mode that proportionally controls the steering of rear caster wheels while compensating the circuit to keep steering performance independent from the load generated by the rear caster wheels, a no steering mode that maintains the position of the rear caster wheels in the absence of a steering command, and a freewheeling mode that permits the rear caster wheels to rotate freely 360°.

Abstract: Mounting structure for housing-free hydraulic axial piston machines of the bent axis or swash plate design, having a closing plate on which a cylinder block unit with displacing pistons arranged therein is supported, and having a drive or driven shaft. The mounting structure here is designed in the manner of a basket and has a receptacle for the drive or driven shaft and at least two struts which are in each case connected at one end to the receptacle and at the other end to the closing plate in such a manner that the closing plate, the cylinder block unit and the drive or driven shaft are held—analogously as in a housing—in a functionally ready position.

Abstract: Method for engaging and disengaging a hydraulic motor which is adjustable in its displacement from and to a hydrostatic drive train of a hydromechanical transmission with a closed hydraulic fluid circuit. Two adjustable hydraulic motors and a hydraulic pump are arranged in parallel in the hydrostatic drive train and connected to a mechanical drive on the output side. At least one of the two hydraulic motors is connected to the mechanical drive via an assigned clutch. As appropriate to the driving situation, during operation of the other hydraulic motor and the hydraulic pump at least one of the hydraulic motors is engaged via the assigned clutch with the hydromechanical transmission from which the hydraulic motor was previously disengaged, likewise as appropriate to the driving situation.

Abstract: A speed control system for a hydrostatic transmission includes an engine having a drive shaft connected to a hydraulic pump. At least one hydrostatic motor is connected to the pump in a closed circuit by a flow line. Connected to the motor via a system shaft is a vehicle system. A controller is connected to a plurality of sensors and a proportional high pressure relief valve that is connected to the flow line between the pump and the motor. Based on information received from the sensors, the controller sets the pressure relief valve to limit the pressure to a valve that will not over-speed the engine and allows the demands of the speed control system to be attained. This may be accomplished through the use of various algorithms.

Abstract: A speed control system for a hydrostatic transmission includes an engine having a drive shaft connected to a hydraulic pump. At least one hydrostatic motor is connected to the pump in a closed circuit by a flow line. Connected to the motor via a system shaft is a vehicle system. A controller is connected to a plurality of sensors and a high pressure relief valve that is connected to the flow line between the pump and the motor. Based on information received from the sensors, the controller sets the pump and motor displacements to limit the pressure to a value that will not overspeed the engine and allow the system to automatically provide braking beyond the engine's capability. This may be accomplished through the use of various algorithms.

Abstract: A set of two or more modular-critical-power-distribution skids are arranged in a redundant power center configuration to supply power to electrical loads in a modular data center facility. The skids are housed in hardened buildings. The uninterruptable power supply is electrically and mechanically connected into the multiple power distribution cabinets, all of which are mounted onto a steel framed support structure, which supports a weight of those uninterruptable power supplies and power distribution cabinets. The environmental control system controls a cooling system for the modular-critical-power-distribution skids. Electrical power from the A-side and B-side connects in a redundant power configuration to electrical loads in the cooling system.

Abstract: A joystick for operating heavy machinery. The joystick has a base assembly and a grip assembly wherein a display is integrated into the first end of the grip assembly and the second end is pivotably mounted within the base assembly. Movement of the grip assembly relative to the base assembly moves an actuating assembly of the heavy machinery wherein the display is able to provide useful information to the user during operation.

Abstract: A bearing assembly having a cage that holds a plurality of rollers, an inner race, and an outer race. A layer of viscoelastic material positioned between the inner race and a swashplate and/or the outer race and the housing. Alternatively, the inner race has an elongated groove that receives an O-ring segment and a holder that is fitted over the inner race.