Abstract: A method of conditioning a signal being communicated between a system to be controlled and a controller may include monitoring an actual output signal and conditioning the actual output signal. The method also includes determining the difference between the actual output signal and the condition signal and causing the actual output signal to be filtered based on the relationship between the difference between the actual output signal and the conditioned signal.

Abstract: A power train assembly includes an input member drivingly engaged by a power source, at least one output member and at least one gear assembly. The output member is driveably connected to the input member through the gear assembly. A brake assembly is engaged with the output member and a casing is configured to enclose the gear assembly and the brake assembly. The casing includes a main chamber in communication with at least one storage chamber and a reservoir. The storage chamber is adapted to receive a flow of lubrication fluid from the reservoir.

Abstract: A hydraulic system includes a pressurized fluid supply, a plurality of non-priority elements each including a signal port and a supply port, at least one priority implement including a signal port and a supply port and a priority valve arrangement. The priority valve arrangement is adapted to receive fluid from the pressurized fluid supply and selectively apportion fluid between the supply port of the priority implement and the supply ports of the plurality of non-priority elements. The valve arrangement includes a signal circuit operative to establish a flow priority between the priority implement and the plurality of non-priority implements and the signal circuit is in fluid communication with the priority supply. The signal circuit includes a pilot portion and a dynamic load portion and the signal port of the priority implement is in fluid communication with the priority valve arrangement through the dynamic load portion of the signal circuit.

Abstract: A fluid control system includes a pressure supply and a valve arrangement having an inlet and an outlet and being in fluid communication with the pressure supply. The valve arrangement includes a relief operator configured to provide fluid communication between the inlet and the outlet of the valve arrangement in response to a predetermined pressure condition at said inlet. The valve arrangement is configured to provide fluid communication between the inlet and the outlet of the valve arrangement in response to an outlet pressure being greater than an inlet pressure.

Abstract: A brake apparatus includes a brake disk secured to a shaft and a reaction plate secured to a housing. The brake apparatus further includes a fluid actuated piston which urges the brake disk against the reaction plate to slow rotation of the shaft and an adjustment member positioned by the piston. The brake apparatus yet further includes a spring interposed between the adjustment member and the piston. The piston positions the adjustment member relative to the brake disk when fluid is applied to said piston. The spring urges the piston away from the adjustment member and brake disk when fluid pressure is removed from the piston.

Abstract: A fluid control system may comprise a pump, a tank, and an actuator including a working chamber. The system may be operative to control rotational movement of a swing structure and movement of an least one implement. A valve assembly may be configured to control fluid communication between the working chamber and the tank and to control fluid communication between the working chamber and the pump. An input device may be operative to selectively control movement of the swing structure. The system may include a controller in communication with the valve assembly and the input device. The controller may be configured to control a flow condition of the working chamber through a sensed pressure condition of the working chamber and a command from the input device.

Abstract: A fluid system includes first and second control valves that control fluid communication with first and second actuators. The first control valve may combine fluid flow from a second end port of the first actuator with fluid flow from a pressurized fluid source when providing a supply of fluid to a first end port of the first actuator. The first and second control valves include first and second signal ports in fluid communication with the supply of fluid to the first and second actuators. A resolver outputs a resolved signal pressure equal to the greater of a first signal pressure output by the first signal port and a second signal pressure output by the second signal port. A compensator in fluid communication with the first control valve and the first actuator controls fluid flow from the first control valve to the first actuator based on the resolved signal pressure.

Abstract: A hydraulic regeneration system for a work machine is provided. The hydraulic regeneration system includes a first hydraulic actuator having a first chamber and a second chamber, a second hydraulic actuator having a third chamber and a fourth chamber, and a source of pressurized fluid. A first directional control valve is disposed between the source of pressurized fluid and the first chamber of the first hydraulic actuator and the third chamber of the second hydraulic actuator. A second directional control valve is disposed between the source of pressurized fluid and the second chamber of the first hydraulic actuator and the fourth chamber of the second hydraulic actuator. An accumulator may also be used to store pressurized fluid and selectively supply pressurized fluid to increase the efficiency of the work machine.

Abstract: A method of manufacturing involves providing a sub-unit including a shaft and a bevel gear associated with the shaft, and also providing a first support member and a second support member. A first bearing is positioned between the sub-unit and first support member. A second bearing is positioned between the second support member and the sub-unit. The first support member is connected to the second support member. Preload on the first and second bearings is adjusted. At least the sub-unit, the first support member, the second support member, the first bearing, and the second bearing constitute an assembly capable of being installed in a housing.

Abstract: A joystick controller is provided in a hydraulic circuit having a pair of hydraulic actuators and oriented with respect to the operator so that movement of a control lever of the joystick controller relative to a reference axis oriented perpendicular to the operator results in control signals being generated and delivered to the first and second main control valves so that the respective cylinders are moved in a direction that is intuitive to the operator. For example, forward movement of the control lever results in both hydraulic actuators moving in the same forward or downward direction and movement of the control lever rearwardly results in both actuators moving in the rearward or upward direction. Likewise, movement of the control lever along an axis that is oriented forty five degrees from the reference axis results in control of one of the actuators independent of the other one.

Abstract: A fluid circuit for raising and lowering an implement including a quick drop valve member movable between at least a first position and a second position, the first position corresponding to a non-quick drop hydraulic fluid flow path of the fluid circuit and the second position corresponding to a quick drop hydraulic fluid flow path of the fluid circuit, the quick drop valve member being movable between at least the first and second positions based on pressures in the fluid circuit produced by hydraulic fluid. The fluid circuit further including a control system configured to selectively apply a biasing force against the quick drop valve member biasing the quick drop valve in the first position, the control system providing the biasing force independent of pressures in the fluid circuit produced by the hydraulic fluid.

Abstract: A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently controlled valves controlling the flow of fluid into and out of the other end of the actuator. Regeneration of the fluid flow from one end of the actuator to the other end of the actuator is provided by blocking the exhaust flow of fluid to the reservoir by one of the independently controlled valves and redirecting the flow across the other of the independently controlled valves to join with the flow of the pump that is being directed to the other end of the actuator. This arrangement permits a portion or all of the fluid from one end of the actuator to be regenerated to the other end of the actuator.

Abstract: A method is provided for controlling a torque output of an hydrostatic motor in fluid communication with a variable displacement pump. At least one of the motor and pump has variable displacement capabilities. The method includes monitoring at least one motor condition of the hydrostatic motor and determining a displacement signal corresponding to the monitored motor condition. The variable displacement capabilities are controlled based on the displacement signal to reduce a torque ripple in the torque output of the hydrostatic motor.

Abstract: A solenoid actuated valve assembly includes a valve assembly including at least a moveable valving element and a solenoid assembly including an armature. The solenoid assembly is operative to move the armature in response to electrical activation of the solenoid assembly wherein the armature is independently moveable relative to the valving element and the valving element is in tracking engagement with the armature. The valving element is not retained by the solenoid assembly.

Abstract: A method is provided for controlling displacement of a variable displacement pump coupled to a load. The method includes determining an electrical signal to be applied to a proportional solenoid for a desired pump displacement based on known pump characteristics. The electrical signal is provided to the proportional solenoid. The displacement of the variable displacement pump is controlled based on the electrical signal to the proportional solenoid.

Abstract: A removable shaft assembly having a drive shaft with internal splines defined therein and an output shaft positioned within the drive shaft and having a first set of external splines defined thereon adapted to engage the internal splines of the drive shaft is disclosed. The assembly further includes a cap axially aligned with the drive shaft having internal splines defined thereon which are adapted to prevent an axial movement of the output shaft relative to the drive shaft when the cap is in a first position and hallow axial movement of the output shaft relative to the drive shaft when the cap is in a second position. The output shaft may be removed from the drive shaft when the cap is placed in the first position by axially sliding the first set of external splines through the internal splines of the cap. A method of operating a removable shaft assembly is also disclosed.

Abstract: A suspension control system includes a load support member, a base member and a moveable element attached to the base member and the load support member. The load support member is moveable relative to the base member through the moveable element. An accumulator is in fluid communication with the moveable element. A locking circuit is disposed between the moveable element and the accumulator and is selectively activatable to sustain the load support member in a fixed position. The locking circuit includes a pressurized fluid supply and a flow blocking mechanism operably engaged with the pressurized fluid supply. The flow blocking mechanism is urged to block fluid communication between the moveable element and the accumulator when the locking circuit is selectively activated.

Abstract: An accessory drive system to provide engagement between a driving input source and a driven accessory unit includes a housing attachable to the input source. A fluid suction port and a discharge port are defined by the housing and the suction port is in fluid communication with a fluid reservoir of the input source. The fluid discharge port is in fluid communication with the suction port and a gear assembly is rotatably supported by the housing. The accessory unit is operably engaged by the input source through the gear assembly and the gear assembly is structured and arranged within the housing to urge fluid away from the housing in response to movement of the gear assembly.

Abstract: A control valve in fluid communication with an actuator may include a pressurized pilot supply and a fluid reservoir fluidly connected to a passageway defined by a valve body. A pilot operator is selectively moveable within the passageway, and a flow metering operator is moveably disposed within the passageway. A fluid make-up operator, disposed in the passageway and in fluid communication with the fluid reservoir and the actuator, directs pressurized pilot supply fluid in response to a decrease in actuator pressure coinciding with a cavitation condition within the actuator. A control chamber within the valve body contains pressurized fluid from the pilot supply and is in fluid communication with the flow metering operator. The flow metering operator fluidly connects the actuator with the fluid reservoir under the influence of the pressurized fluid within the control chamber through activation by either the pilot operator or the fluid make-up operator.

Abstract: Multiple circumferential rows of textured features are formed between the outer peripheral edge and the inner peripheral edge of a seal. The multiple circumferential rows of textured features form a boundary for incoming dirt and wash away abrasive particles as well as act as lubricant wells. The multiple rows provide additional protection from leakage and wear.