Abstract: A variable displacement bent axis unit comprising a housing and a yoke pivotally disposed therein wherein the yoke has a cam member attached thereto. A control mechanism that changes the displacement of the unit has a control valve disposed therein that engages the cam member. The cam member itself has a non-linear feedback profile such that the feedback profile provides a linearized speed ratio.

Abstract: Hydraulic system with a hydraulic machine, in particular an axial piston or radial piston unit, with rotating and moving machine components which are arranged in a housing. The housing is connected to a high-pressure and a low-pressure line of a working circuit, which is supplied with pressure fluid by means of a charge pump. The leakage fluid which occurs in the housing collects in a leakage fluid reservoir which is arranged below the rotating and moving hydraulic machine components in the working position of the hydraulic machine and is connected fluidically to the housing. The leakage fluid is pumped out of the leakage fluid reservoir into the low-pressure line of the working circuit by the charge pump.

Abstract: A method of operating a transmission of a vehicle. The method includes determining an open loop ratio percentage from an engine RPM input signal and a brake input signal using a first algorithm. Determining a closed loop ratio percentage from the engine RPM input signal, a vehicle RPM input signal and a throttle input signal using a second algorithm. Summing the open loop percentage and closed loop ratio percentage to calculate a ratio command percentage that is used to sum with a swashplate input to actuate a swashplate positioner and operate the transmission.

Abstract: The invention relates to a hydraulic drive (2) having a main pump (8), which can be adjusted in terms of delivery volume and delivery direction, and having a hydraulic motor (9), which main pump (8) and hydraulic motor (9) are connected to one another in a closed circuit via pressure lines (10A, 10B), and having a charge pump (14, 15) for charging into the closed circuit and for supplying pressurized fluid to at least one controling device (11, 12), wherein the charge pump (15) has a separate drive motor (19) whose power/rotational speed can be specified independently of the rotational speed of the drive (3) of the main pump (8). In this way, the charge pump (15) can be of smaller dimensions than previously conventional, and the power balance of the hydraulic drive can be improved.

Abstract: An axial piston hydraulic machine having a housing with a cylinder block with reciprocating pistons disposed therein. The reciprocating pistons are rotatably connected to a swashplate at a first end of the swashplate. At a second end of a swashplate support balls are received and engage the housing. The support balls are located radially from the plurality of reciprocating pistons such that the distance between the axis of rotation of an input shaft and a piston axis of the plurality of pistons is significantly less than the radial distance between the axis of rotation of the shaft and the center points of the support balls, and wherein the pivot axis passing through the center points of the support balls lies in or near the plane passing through the piston/slipper ball joints.

Abstract: A joystick device having a grip assembly pivotably connected to a base assembly. The base assembly having sensing elements that detect the movement of the grip assembly as it pivots about the base assembly. Disposed within the base assembly and the sensing elements is a microprocessor. The microprocessor verifies an output signal prior to transmitting to a remote controller.

Abstract: An axial piston hydraulic device. The device has a housing that uses a servo piston in order to control the displacement of a swashplate within the device. By using a servo member disposed within a cavity of an end cap on the housing the axial piston hydraulic device is able to provide three operating positions depending on the angle of the swashplate.

Abstract: A method of operating a vehicle with a hydrostatic circuit. The method includes providing a hydrostatic circuit having first and second hydraulic kits that are fluidly connected to one another by first and second fluid lines. A by-pass valve is placed between the first and second hydraulic lines and is controlled in order to actuate the by-pass valve when certain predetermined conditions are present in order to relieve pressure within the hydrostatic circuit.

Abstract: A hydrostatic transmission having a hydraulic pump that is fluidly connected to a hydraulic motor. The transmission also has a pressure control valve that has first and second stages and is fluidly connected to the hydraulic pump. By utilizing the pressure control valve when the first stage of the pressure control is at a minimum pressure the second stage determines the minimum charge pressure setting for the hydrostatic transmission.

Abstract: A hydromechanical transmission having a self actuating clutch assembly. The self-actuating clutch assembly comprises a first and second gear clutching elements and a shaft clutching element that engages a shaft. The shaft clutching element is a cone clutch that is actuated by a ball element that is biased towards the shaft clutching element by a spring element that is disposed through the shaft.

Abstract: A method of manufacturing a circuit board assembly for a controller. The method includes providing first and second printed circuit boards wherein the first printed circuit board has a plurality of copper pads containing slots therein that correspond to a plurality of power tabs in the second printed circuit board. The power tabs are then slid into the slots and the tabs are flooded with copper. At this time the power tabs are soldered within the slots to provide an electrical connection between the first and second printed circuit boards that allows for the transfer of current between the boards of more than three amps.

Abstract: A bent axis hydromodule that utilizes a bearing carrier assembly between the trunnion of a yoke and the frame of the bent axis hydromodule. The bearing carrier receives the trunnion and is secured to the frame by at least one fastening element that extends axially perpendicular to the trunnion axis that causes the fastening element preload force to be in the same direction as primary loading of that joint.

Abstract: A roller vane pump that uses slippers on its rollers to create multiple seals. The roller vane pump has a fixed cam ring that has a rotor within. The rotor has openings that receive rollers that rotate about the inside of the cam ring. Each roller has a slipper rotatably connected thereto. The use of the slipper allows multiple seals to be created between the slipper, the rollers, and the cam ring and additionally allows for the roller vane pump to rotate clockwise or counterclockwise without the changing of parts.

Abstract: A three position servo system. The servo system has a servo housing that has first and second control ports disposed therein in a cavity in fluid communication with the first and second control ports. A servo piston having at least one pressure chamber disposed therein is then used to communicate the pressure within the first and second ports into the first end of the cavity. Thus, when pressure is applied below a threshold pressure to both ports a first position is achieved, when pressure is applied above the threshold pressure in only one port a second position is achieved, and when pressure is applied above the threshold pressure in both ports a third position is achieved. Therefore, the servo system provides three different operating positions.

Abstract: A method of cooling a radiator in an internal combustion engine wherein a plurality of fan assemblies is provided. Specifically, each fan assembly has a housing with an interior containing a fan blade and an exterior having six sides to form a hexagonal perimeter. The fan assemblies are then arranged side by side to form a cluster of fan assemblies in order to maximize the amount of fan assemblies that may be provided on an enclosure. The cluster of fan assemblies is then placed adjacent to a radiator to control the air flow over the radiator in order to cool the engine.

Abstract: 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.

Abstract: An electronic traction control system for a vehicle having multiple hydraulic driven wheels includes a plurality of digital displacement pumps, a plurality of drive systems having counterbalance valves and motors used to drive wheels, and electronic flow control valves used in association with each drive assembly. Additionally the system has a steering mechanism that is electrically connected to a digital sensor and a proportional sensor that sends signals to a system controller that operates the functioning of the digital displacement hydraulic pumps.

Abstract: A hydraulic power unit that uses a quantity of media within a cavity adjacent to and surrounding a hydraulic assembly in the housing of the hydraulic power unit to reduce the overall noise of the unit. Additionally, the cavity either seals the media from the moving parts of the hydraulic assembly or isolates the media from the moving parts of the hydraulic assembly to ensure damage to the hydraulic assembly does not result.

Abstract: A selectable detent assembly that has a housing with a plurality of passageways. Within the housing is a selector spool that is disposed within a selector passageway and is rotatable to provide a plurality of rotational positions including a no detent position, a kick down position, and a continuous detent position. A pilot check valve is disposed within the housing and provides a fluid flow path from a pilot passageway to the selector passageway and a detent passageway. A detent arming piston is disposed within the detent passageway and is connected to a directional control valve spool. Thus, depending on the rotational position of the selector spool, the selector spool can either provide a continuous flow path through the selector passageway to a tank, a flow path that is controlled by the axial position of the selector spool or prevent flow to the tank in order to operate the detent arming piston.

Abstract: An assembly having a frame supported by a plurality of ground engaging wheels. Mounted to the frame is an operator control system that is connected to a controller that is powered by an electrical source. The controller is operatively connected to a blade assembly and a ground drive assembly and adjusts the ground speed of the assembly based upon the cutting load of the blade.