Abstract: A steerable vehicle knuckle has an inboard portion defining upper and lower arms, with a kingpin between them, and has an outboard portion defining a spindle that cooperates with a fluid driven motor. The arms define a cavity where an axle end portion is pivotally received. Fluid supply ports, which supply fluid to energize the motor, are located on an upper surface of the knuckle's inboard portion. Fluid drain lines extend within the knuckle from the motor to the cavity and are utilized to drain fluid from the motor. The supply ports and drain lines are each connected to separate hoses formed in a small arc that follows closely the circular curvature of the kingpin. This arrangement of port, lines, and hoses is less expensive to produce, easier to package, more robust, allows for faster steering reaction, and is easier to assemble than conventional arrangements.

Abstract: A hydrostatically driven vehicle has an engine operating a variable displacement propel pump, a displacement of which can vary based on an angle of a rotating swashplate, such that a fluid flow impelled by the pump transfers power to at least one propel motor rotating a wheel of the vehicle. An electronic controller of the vehicle senses an operating parameter of the system, for example, the angle of the rotating swashplate or the direction and speed of rotation of the propel motor with a sensor to yield an actual signal, and relays the actual signal to an electronic controller. The controller determines a desired angle for the rotating swashplate based on the control signal, and compares it to the actual signal from the sensor. Motion of the vehicle is stalled when the angle signal differs from the desired angle by a predetermined extent and for a predetermined period.

Abstract: A vehicle, in particular an agricultural tractor, is disclosed with a vehicle chassis, which is formed at least partly from two laterally spaced side members (1, 2) with C-shaped profile, comprising a vertical bar (1a, 2a) and two horizontal flanges (1b, 2b) and containing hydraulic lines in the space between the flanges, and with a radiator sub-assembly (5), fitted to the vehicle chassis, which consists of a carrier plate (6) fitted to the side members and several oil coolers (8, 9) supported by the carrier plate.

Abstract: An in-the-wheel hub-less suspension system for use on a vehicle is disclosed. The suspension mechanism has at least two vertical guides; at least two mounting brackets to be affixed to diametrically opposing positions on the rim of the wheel to which the suspension system is to be attached; at least one shock absorber unit; and one spring for each vertical guide. Each of the vertical guides extends through one of the at least one shock absorber units, wherein the spring for each vertical guide is located underneath the at least one shock absorber unit and encloses the vertical guide; and wherein each end of each of the at least two vertical guides engages with the corresponding mounting bracket.

Abstract: A work machine having a mechanical transmission in combination with a hydrostatic ground drive including a primary drive and a secondary drive engageable for providing additional propulsion torque in a power assist mode, the hydrostatic drive automatically providing an increased torque capability when the transmission is engaged in a high speed range, thereby allowing the work machine to accelerate from a complete stop to a high speed range with the transmission in a high speed range without the need to stop to shift the mechanical transmission to accommodate an increased propulsion torque requirement.

Abstract: A hydraulic pressure accumulator has an interior chamber containing a fire-suppressing gas such as nitrogen. The fire-suppressing gas in the accumulator is fluidly connected to a thermal device, such as a valve with a thermal fuse or a controlled valve triggered by a thermal sensor. The thermal device is designed to open a fluid connection between the accumulator's interior chamber to ambient when the exterior temperature exceeds a determined safety threshold, thereby releasing the fire suppressing gas from the accumulator.

Abstract: A vehicle includes an integrated drive module coupled to an axle thereof. The module includes a hydraulic motor configured to provide motive power at an output shaft, and a differential for distributing the motive power to right and left portions of the axle. The hydraulic motor and the differential are encased within a common housing. The vehicle may include a second integrated drive module having, within a housing, a second hydraulic motor (or multiple hydraulic motors), and a second differential coupled thereto and configured to distribute motive power to right and left portions of a second axle. The second module may also include a transmission within the same housing. The transmission may be a two speed or other multi-speed transmission. The second module is configured to operate in neutral while power demand is below a threshold, and to engage while the power demand exceeds the threshold. The second module may be configured to remain engaged for full-time four-wheel-drive operation.

Abstract: A transaxle (1), having a hydraulic drive unit (20) and a pair of left and right wheel support units (2L and 2R), is suspended from a vehicle frame so as to be turnable around a turning-center axis oriented in a fore-and-aft direction of a vehicle. The hydraulic drive unit (20) comprises: a pair of left and right hydraulic motors (23L and 23R) having respective left and right horizontal motor shafts (23b); a center section (22) formed therein with an oil passage for hydraulically connecting at least one of the hydraulic motors to a hydraulic pump, the center section having motor attachment surfaces onto which the hydraulic motors are attached; and a pair of left and right axle casings (2L and 2R) containing the respective hydraulic motors and supporting the respective motor shafts.

Abstract: Fluid control propulsion system, machine including the system, and method of controlling the propulsion of a machine having a compacting drum and a wheel mounted on an axle, drum and axle motors operatively connected with the drum and the axle, respectively, and drum and axle pumps operatively connected to an engine and fluidly connected to the pumps. A fluid control orifice disposed in fluid communication between the pumps is selectively disengageable in response to at least one of operator instruction, sensed pressure differential between the drum and axle pumps, and sensed disparity in rotational speed between the drum and axle.

Abstract: A work vehicle operable in a rearward facing position using a simple construction is disclosed. The work vehicle includes a hydrostatic stepless change speed device for transmitting power from an engine to a traveling device, a change speed pedal mechanism operable in a forward facing position for changing speeds in the hydrostatic stepless change speed device, and a travel-control lever provided at a rear position of a vehicle body and operable in the rearward facing position. The travel-control lever and the change speed pedal mechanism are linked to each other through a mechanical interlocking mechanism so as to control the hydrostatic stepless change speed device by the travel-control lever through the change speed pedal mechanism.

Abstract: There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block.

Abstract: There is provided a power transmission device for a working vehicle, in which a drive takeoff shaft for front wheels can be easily mounted on or dismounted from a transmission case and hence the workability of assembly, maintenance, and the like can be improved but the cost of manufacturing the transmission case and the like can be easily reduced. In the power transmission device for a working vehicle provided with: an engine mounted on a running vehicle body having front wheels and rear wheels; a hydrostatic continuously variable transmission for variably transmitting power from the engine; and the transmission case for transmitting a transmission output from the hydrostatic continuously variable transmission, the drive takeoff shaft for front wheels for transmitting a driving force to the front wheels and the hydrostatic continuously variable transmission are arranged on a center plate disposed on the front side of the transmission case.

Abstract: A vehicle includes a first transaxle incorporating a first hydraulic motor for driving a first axle, a pair of second transaxles incorporating respective second hydraulic motors for driving respective second axles, and a pump housing separated from the first transaxle and the pair of second transaxles. The pump housing incorporates a hydraulic pump. The first hydraulic motor and the pair of second hydraulic motors are fluidly connected in series to the hydraulic pump. The second hydraulic motors are fluidly connected in parallel to the hydraulic pump.

Abstract: A hydrostatic transmission including a pump and motor connected by supply and return lines. The hydrostatic transmission can be an integrated unit mountable to a vehicle frame as a unit. The motor portion of the transmission is configured to be at least partially received within a wheel to which an output shaft of the motor can be directed connected. Accordingly, the output shaft of the motor can be configured to function as a wheel axle.

Abstract: The effective length of pump control linkage assembly of a pump-driven vehicle such as a zero-turn lawnmower can be adjusted without directly manipulating a rod or similar member forming the major length of the assembly. The length instead can be adjusted from above with a simple tool such as a screwdriver or wrench using a knob or similar device. In one embodiment, the linkage assembly includes a rod having a top end and a bottom end. The bottom end is attached to the pump. The top end of the rod is received by an internally threaded insert which is housed in a housing. The internally threaded insert includes an engagement structure such as a hex head for mating with the tool. Upon rotation of the insert using the tool, the insert rotates to drive the rod into or out of the insert and, thereby, vary the effective length of the linkage assembly.

Abstract: A materials handling vehicle is provided comprising a frame including structure for defining an operator compartment and structure for defining a battery compartment; first and second front wheels coupled to the frame; a rear steer wheel assembly coupled to the frame; an electric motor; and a controller coupled to a front wall of the frame to control the operation of the electric motor.

Abstract: A hydrostatic transmission that is operated in an open loop by way of an adjustable hydraulic motor (5), which is adjusted for the purpose of acceleration or deceleration with the aid of an electronic control unit (8) such that a desired vehicle speed corresponds to a measured vehicle speed.

Abstract: A transmission includes a transmission case accommodating a planetary gear mechanism, a traveling speed change mechanism, a differential gear mechanism and a PTO clutch mechanism, and supporting an HST. The HST is connected to a first end wall of the transmission case positioned on one side in a vehicle longitudinal direction in a state that its HST output shaft is positioned its HST input shaft. A plurality of traveling rotational shafts forming a traveling transmission path are positioned coaxially with the HST output shaft, or on a first side of the HST output shaft in a vehicle width direction and below the HST output shaft. A plurality of PTO rotational shafts forming the PTO transmission path are positioned coaxially with or below the HST input shaft.

Abstract: A swivel joint for a construction machine is mounted to an upper track frame, and a body is rotatable together with a swing structure main frame in an opening through engagement between a stopper projection and a stopper plate. Tubes on the swing structure side are connected to an upper end surface of the body by using fittings in concentrated layout, and tubes on the travel structure side are connected to a lower portion of the spindle by using fittings. The body has thicker wall portions in sidewalls thereof, and a plurality of axial passages communicating with a plurality of circumferential grooves are formed inside the thicker wall portions. The plurality of axial passages are opened at the upper end surface of the body, and the tubes on the swing structure side are connected to the upper end surface of the body in concentrated layout.

Abstract: Disclosed is a cleaning system for removing coatings from a hard surface by high pressure liquid. The system employs a combination liquid and vacuum reservoir connected to a high pressure pump for directing ultra high pressure water through a blast head mounted on a front portion of the vehicle. The cleaning system is preferably mounted on a single truck with a single prime mover. The drive-line of the vehicle is constructed and arranged to operate in two distinct modes, e.g. a transport mode and a work mode. In the transport mode, a first transmission coupled to the rear portion of the prime mover delivers torque from the engine to the rear wheels of the vehicle. In the work mode, the prime mover is utilized to mechanically drive the bed mounted equipment as well as provide motive force in the form of mechanical-hydrostatic transmission to propel the system at a speed suitable for marking removal.

Abstract: There is provided a pump unit including plurality of hydraulic pump bodies respectively fluidly connected to plurality of hydraulic motor bodies, which are disposed away from the pump unit, so as to form closed circuits, the pump unit including: a housing accommodating the plurality of hydraulic pump bodies so that the plurality of hydraulic pump bodies are operatively driven by a common driving source; a charge pump body operatively driven by the driving source; a suction fluid passage fluidly connected to a suction side of the charge pump body; a discharge fluid passage fluidly connected to a discharge side of the charge pump body; a charge passage for replenishing a part of pressurized fluid in the discharge fluid passage into each of the closed circuits; and a working machine operating fluid passage for supplying a part of the pressurized fluid in the discharge fluid passage toward an external hydraulic actuator.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational per from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; and auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: An active vibration insulator includes an electromagnetic actuator, a controller, and a bad-roads processor. The electromagnetic actuator generates vibrating forces depending on electric-current supplies. The controller carries out vibrating-forces generation control. In the vibrating-forces generation control, the electric-current supplies are made variable so as to actively inhibit vibrations generated by an on-vehicle vibration generating source of a vehicle from transmitting to a specific part of the vehicle based on cyclic pulsating signals output from the on-vehicle vibration generating source. Thus, the controller lets the electromagnetic actuator generate the vibrating forces. The bad-roads processor stops the vibrating-forces generation control effected by the controller when the vehicle travels on bad roads.

Abstract: A unitary rear frame mounting an engine and hydrostatic transmissions to the rear of a ZTR mower is disclosed. The unitary rear frame includes a lower mounting surface supporting the engine, an upper mounting surface above and forward of the lower mounting surface; a wall extending between the upper and lower mounting surfaces; and a pair of integral side panels depending downwardly from the upper mounting surface and extending forwardly of the wall. Each side panel may have a side pocket for mounting a hydrostatic transmission thereto.

Abstract: A hydro-static transmission travel system for a working machine enables the working machine to travel over a range from low speed to high speed with a simplified circuit arrangement. By referring to a machine traveling speed (vehicle speed) based on a detected signal from a rotation sensor, a controller computes respective target tilting amounts of hydraulic motors 10, 20 and controls the tilting amount for the hydraulic motors and a clutch. Depending on whether the traveling speed exceeds a setting speed as a reference boundary, the controller selectively switches over a drive mode between low-speed four-wheel drive, in which travel units 12, 22 are both driven, and high-speed two-wheel drive, in which the front-wheel side hydraulic motor 10 is controlled to zero displacement and only the rear-wheel side travel unit 22 is driven.

Abstract: There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block.

Abstract: A power-dividing device for a working vehicle includes a case member, an input shaft supported by the case member so that a first end portion of the input shaft can be operatively connected to a driving source, a PTO unit having a PTO shaft supported by the case member so as to be offset with respect to the input shaft, a power transmission mechanism accommodated in the case member to transmit power from the input shaft to the PTO shaft, and a first pump unit having a first pump shaft operatively connected to the input shaft and being fluid-connected to an actuator disposed outside.

Abstract: A hydraulic-drive work vehicle includes a plurality of variable capacity hydraulic motors which are rotated by receiving pressure oil from a variable capacity hydraulic pump. Wheels provided at two or more axles are rotated due to torques of the hydraulic motors. The work vehicle is provided with a traveling stabilizer, the traveling stabilizer including a traveling-state detector for detecting a traveling state of the vehicle, and a controller which receives a signal from the detector and varies a capacity of at least particular one of the plurality of hydraulic motors according to the traveling state of the vehicle.

Abstract: The construction vehicle includes an engine, an accelerator pedal, a main pump configured to be driven by the engine, first and second traveling motors driven by pressured oil discharged from the main pump to generate driving force for traveling, a driving shaft configured to receive the driving force from the first traveling motor and the driving force from the second traveling motor, a clutch configured to switch between transmission and non-transmission of the driving force from the second traveling motor to the driving shaft, an accelerator opening degree detection unit, a vehicle velocity detection unit, and a control unit. The control unit is configured to determine the switchover velocity depending on the opening degree of the accelerator pedal, and to control the clutch when the vehicle velocity that is detected by the vehicle velocity detection unit reaches the switchover velocity.

Abstract: A system, method and computer readable media are disclosed for providing a hydraulic system for a vehicle. The system includes at least one accumulator for storing hydraulic fluid and may also include a flywheel or other storage mechanism for storing energy. Energy may be stored either in one of the accumulators or the flywheel. A control system controls fluid flow to and from the at least one accumulator and, if included, the flow of energy to and from the flywheel such that: in a steady state mode, a first hydraulic pump/motor is energized by an engine to cause hydraulic fluid to flow and actuate a drive line attached to a second hydraulic pump/motor; in a deceleration mode, the second pump/motor is operates as a pump to transfer energy to the at least one flywheel and/or accumulator; and in an acceleration mode, energy is transferred from the at least one flywheel and/or accumulator to the second hydraulic pump/motor to actuate the driveline and accelerate the vehicle.

Abstract: The invention relates to a traction drive for a working machine, in particular an industrial truck, including an electrical converter having a generator (11), which is drive-connected to a combustion engine (12), and a traction motor (1 or 2), which is combined with the generator (11) in spatial terms to form one structural unit. In order to increase the performance of the traction drive whilst having a high degree of efficiency and in order to achieve a simple design, the electrical converter (generator 11, traction motors 1, 2) has, according to the invention, an operating voltage of more than 100 volts, in particular more than 200 volts, and is connected to a cooling liquid cycle.

Abstract: In a hydraulic four-wheel drive vehicle, a rear transaxle incorporates a hydraulic motor for driving rear wheels, a front transaxle incorporates a hydraulic motor for driving front wheels, and hydraulic pressure fluid pipes interposed between the front and rear transaxles are extended along at least one of left and right side plates of a frame of the vehicle.

Abstract: Fluid control propulsion system, machine including the system, and method of controlling the propulsion of a machine having a compacting drum and a wheel mounted on an axle, drum and axle motors operatively connected with the drum and the axle, respectively, and drum and axle pumps operatively connected to an engine and fluidly connected to the pumps. A fluid control orifice disposed in fluid communication between the pumps is selectively disengageable in response to at least one of operator instruction, sensed pressure differential between the drum and axle pumps, and sensed disparity in rotational speed between the drum and axle.

Abstract: A method and apparatus to move a modular drilling rig in formation wherein the drilling rig includes a plurality of self-propelled modules to facilitate the movement of the rig while all systems are intact and fully operational. The apparatus includes a plurality of wheel assemblies which are steerable to guide the modules during movement. The apparatus also includes a propulsion system for each of the modules to drive each of the modules during movement. A steering control and position feedback system is also provided for determining the relative position of each module with respect to the master module. This control and feedback system provides feedback to the steering control and feedback systems of other modules in order to move the modules in a formation.

Abstract: A vehicle transmission having a pair of left and right HSTs for driving respective axles is applicable for a riding lawn mower. The transmission comprises a center casing incorporating a distributing drive train. In the fore-and-aft direction, an input shaft of the distributing drive train projects from the center casing toward a prime mover, and a PTO shaft for driving a mower unit projects from the center casing opposite to the prime mover. A pair of left and right deceleration drive train casings for incorporating respective deceleration gear trains and supporting the respective axles are disposed on respective left and right sides of the center casing. A pair of left and right stepless transmission mechanisms, each of which is drivingly interposed between the distributing drive train and each of the deceleration gear trains in the deceleration gear train casings, are mounted on left and right side portions of the center casing opposite to the prime mover in the fore-and-aft direction.

Abstract: A utility vehicle comprises: a cargo; an engine disposed under the cargo, the engine including a fore-and-aft crankshaft; a lateral axle disposed under the cargo; a hydrostatic transmission (a hydraulic pump and a hydraulic motor) disposed under the cargo so as to transmit power from the engine to the axle; and a mechanical transmission (e.g., a planetary gear mechanism) disposed under the cargo so as to transmit power from the engine to the axle. The mechanical transmission includes a transmission shaft disposed in parallel to the axle. The hydrostatic transmission and the mechanical transmission are laterally juxtaposed. Therefore, the utility vehicle is minimized while ensuring a sufficiently large capacity of the cargo.

Abstract: Taught is an apparatus for converting energy in a wheeled vehicle, comprising a wheel rim; a tire; and a plurality of hydraulic plunger cylinders alternatively distributed on periphery of the wheel rim.

Abstract: A wheel end assembly comprises a wheel hub support housing and a wheel hub drive assembly rotatably connected to the wheel hub support housing. The wheel end assembly also includes a hydraulic motor operatively coupled to the wheel hub drive assembly, the hydraulic motor being disposed to deliver a torque to the wheel hub drive assembly. The wheel end assembly further includes a pump, fluidly coupled to the wheel hub drive assembly and the hydraulic motor, the pump being disposed to provide a flow of hydraulic fluid to the wheel hub drive assembly.

Abstract: There is provided an HST unit including: a first hydraulic motor unit for operatively driving one of a pair of driving wheels; a second hydraulic motor unit for operatively driving the other one of the pair of driving wheels; a hydraulic pump unit operatively connected to a driving power source, the hydraulic pump unit configuring a traveling hydrostatic transmission in cooperation with the first and second hydraulic motor units; and an attachment frame for supporting the first hydraulic motor unit, the second hydraulic motor unit and the hydraulic pump unit, the attachment frame being attachable to a vehicle frame.

Abstract: An HST unit includes a first hydraulic motor unit for operatively driving one of a pair of driving wheels; a second hydraulic motor unit for operatively driving the other one of the pair of driving wheels; a hydraulic pump unit operatively connected to a driving power source, the hydraulic pump unit configuring a traveling hydrostatic transmission in cooperation with the first and second hydraulic motor units; and an attachment frame for supporting the first hydraulic motor unit, the second hydraulic motor unit and the hydraulic pump unit, the attachment frame being attachable to a vehicle frame.

Abstract: A hydraulic energy recovery and a mechanical drive system in one unit that also provides integral mounting of hydraulic pump/motors for primary drive, secondary drive, and pumps for cooling, lubrication, and low pressure systems along with a mounting position for a power take-off device.

Abstract: A steerable hydraulic transaxle comprises: a kingpin relatively rotatably supported by a vehicle chassis; a housing fixed to the kingpin; a single axle disposed in the housing; a single wheel fixed onto the single axle out of the housing; and a hydraulic motor disposed in the housing so as to drive the single axle.

Abstract: The apparatus of the present invention includes a hydrostatic retarder pump and motor. The apparatus includes a housing rotatably supporting a shaft. The shaft includes a first eccentric portion and a second eccentric portion. A plurality of pistons are disposed within the housing and are engageable with the first eccentric portion. A plurality of valves are also disposed within the housing and are engageable with the second eccentric portion. The plurality of valves are configured to selectively connect the plurality of pistons with a low pressure accumulator or a high pressure accumulator. The rotation of the shaft may be implemented to drive the plurality of pistons and thereby transfer hydraulic fluid from the low pressure accumulator to the high pressure accumulator such that resistance is applied to the shaft and vehicle output is retarded. Alternatively, hydraulic fluid from the high pressure accumulator may be implemented to drive the plurality of pistons and thereby power the vehicle.

Abstract: A mobile machine, such as an industrial truck, has heat-emitting drive components (K) of a traction drive and a hydraulic work system. The traction drive includes at least one electric traction motor (3) and a traction motor control system (7). The hydraulic work system includes at least one electric pump motor (5) and a pump motor control system (6). At least some of the drive components (K) are located in a cooling circuit. The cooling circuit has a cooling device (1), to which, on the output side, the traction motor (3), the pump motor (5), the traction motor control (7), and the pump motor control system (6) are connected, and which can be connected on the input side, depending on the fluid temperature in a reservoir (9) of the hydraulic work system, to the reservoir (9) or to a return line of the heat-emitting drive components (K).

Abstract: A hydrostatic drive system has a travel drive (4) and working hydraulics (6). The working hydraulics (6) have a variable delivery pump (5) connected to the driving engine (1). The pump (5) is connected to a container (10) on the inlet side and delivers to a delivery line (11), to which at least one consumer of the working hydraulics (6) is connected. The pressure medium delivered by the pump (5) is feedable to a pressure valve (9). The pressure valve (9) is arranged in the delivery line (11) from the pump (5) to a control valve device (13; 15; 17; 18). A container branch line (29), which is connected to a container (10) and in which a circulating device (31) is arranged, is connected to the delivery line (11) downstream of the pressure valve (9).

Abstract: The invention comprises a method, an article, and a control system for controlling a powertrain having a main and an auxiliary hydraulic pump, with each pump operative to supply hydraulic fluid to a hydraulic circuit of the transmission. It includes determining a main pressure and a desired main pressure, and controlling the auxiliary hydraulic pump. Determining a main pressure in the hydraulic circuit comprises estimating hydraulic pressure. The auxiliary pump is controlled to an operating speed. Control of flow from the auxiliary and main pumps can comprise an exclusive ‘either-or’ flow, or a blended flow.

Abstract: An hybrid four wheel drive system characterized by a vehicle having a conventional rear wheel driveline as well as a conventional driving front steer axle powered by an hydraulic motor. The hybrid four wheel drive system is provided in multiple embodiments, particularly with and without an hydraulic pressure accumulator.

Abstract: A propulsion drive system is provided for a utility vehicle having an internal combustion engine, a hydraulic pump connected, so as to be driven by the internal combustion engine wherein the fluid displacement of the hydraulic pump can be varied by a first actuator. A hydraulic motor is connected by a line conducting hydraulic fluid to the hydraulic pump wherein the fluid displacement of the hydraulic motor can be varied by a second actuator and is connected so as to drive at least one propulsion device in engagement with the ground. A control arrangement is connected with a speed input arrangement. The control arrangement is operated so as to control the first actuator and the second actuator in such a way that the overall efficiency of the hydraulic pump and the hydraulic motor is at a maximum.

Abstract: A wheel type work machine having improved ease of assembly and a compact-sized traveling system power transmission mechanism. The wheeled work machine comprises a traveling body (2) having an engine (7) mounted at the rear of a machine frame (6) supported by front and rear wheels (4, 5) and the traveling system power transmission mechanism (8) for transmitting power from the engine (7) to the rear wheels (5). The traveling system power transmission mechanism (8) comprises a rear wheel differential device (38) disposed on the front side of the engine (7), a hydrostatic transmission (35) disposed on the front side and the rear wheel differential device and receiving the power from the engine (7), and a mechanical transmission device (37) disposed between the hydrostatic transmission (35) and the rear wheel differential device (38) and transmitting the power from the hydrostatic transmission (35) to the rear wheel differential device (38).

Abstract: An axle driving apparatus which has a housing and a hydrostatic transmission therein separate from the housing with fluid conduits in a center section connected to hydrostatic rotatable cylinder blocks operatively connected to axle shafts, the improvement involving check valves associated with the fluid conducting conduits and including check valve balls to affect fluid flow through the conduits and being positioned to move in a vertical path in a direction at right angles to the axes of the axle shafts, and a movable bypass arm mounted in the housing and movable to open or close the fluid conduits.