Abstract: A mounting method for a skid steer loader is disclosed including coupling a first end portion of a component directly to a first wall of a skid steer loader frame. The method also includes coupling a second end portion of the component to an opposite wall of the skid steer loader frame by a mounting system that allows for dimensional differences between the component and the skid steer loader frame.

Abstract: A hybrid vehicle is provided with an engine, as well as a transmission having a motor/generator, a stationary member, and a planetary gear set. The engine and the motor/generator are separately selectively connectable to one of the drive axle assemblies by engagement of different ones of the torque-transmitting mechanism to transfer torque to that drive axle assembly. One or both of the engine and the motor/generator is also selectively connectable to the other drive axle assembly by engagement of another one of the torque-transmitting mechanisms to transfer torque to the other of drive axle assembly.

Abstract: A flexible fluid storage system for holding large volumes of fluid and a process and apparatus for the handling and transportation of the flexible storage system is provided. The flexible storage system includes a main storage bag with an attachment apron with fingers, a ground sheet, a lay flat tube for fluid circulation, a pressure release port, and fill/drain ports. The flexible storage system is configured for attachment to a trailer and reel system such that the flexible storage system can be mechanically rolled onto or off of a reel on a semi-truck trailer bed for easy transportation, deployment, and storage of the flexible storage system.

Abstract: A wheel tractor scraper having a rear wheel drive assist, the wheel tractor scraper includes a tractor portion pivotally coupled to a rear scraper portion, the rear scraper portion having a bowl for hauling material and a fluid powered work tool configured to assist in loading the bowl, the work tool powered by a fluid pump connected to a fluid operated work tool motor. The rear wheel drive assist includes a fluid operated drive motor coupled to the rear wheels of the machine, a diverter valve having a first position at which fluid flow is delivered from the pump to the work tool motor and a second position at which fluid flow is delivered from the pump to the drive motor, and a controller being configured to control the diverter valve to engage the rear wheel drive assist. The machine may be operated by engaging the pump and work tool motor, and then actuating the diverter valve to the second position to divert flow from the work tool motor to the drive motor.

Abstract: A rear wheel drive assist for a wheel tractor scraper, the wheel tractor scraper having a tractor portion with a power source operatively connected to the front driven wheels, and a rear, scraper portion having a bowl, work tool, and first and second rear wheels, the rear wheel drive assist includes a work tool pump fluidly connected to a work tool motor to drive the work tool, fluid operated drive motors operatively connected to the rear wheels, and a diverter valve selectively movable between a first position that delivers fluid flow from the pump to the work tool motor, and a second position that delivers fluid flow from the work tool pump to the rear wheel drive motors.

Abstract: A right-and-left-wheel differential torque generator makes a deceleration acted on a vehicle body to be corrected in small even when a rotating electric machine for generating a right-and-left-wheel differential torque is operated to generate a yaw moment of the vehicle, for this purpose, a correcting throttle opening is added to a throttle operation by a driver to correct a torque amount of an engine brake causing a power supply, two power generators A, B coupled independently to each of the left and right wheels and a rotating electric machine C for generating a torsional torque are provided, the power generator A absorbs (brake) the torque from one wheel to generate a power, and this power is supplied so that a torsional torque is generated by the rotating electric machine C in a direction toward which the other wheel (coupled with the power generator B) is accelerated.

Abstract: A personal vehicle has a fore section and an aft section. The fore and aft sections each have a frame, a transaxle mounted to the frame, and a wheels attached to the transaxle. The wheels of the aft section are vertically articulated relative to the frame of the aft section. A seat is disposed on the frame of the fore section. A joystick and interface are mounted to the fore section. A motor is mounted to the frame of the aft section. A hydraulic system is operatively connected to the motor. A shaft is operatively connected to the motor. A fender assembly is mounted to the fore and aft sections. A rollover structure is mounted to the fore and aft sections. The hydraulic systems controls the directional movement of the personal vehicle and includes a hydraulic pump, rotovalves, a null valve, a drive cylinder, and a steering cylinder.

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 control system (1) for a vehicle (10) with two axle drive devices (5, 12) has an engine control device (28) for controlling a first axle drive device (5) for driving a first axle of the vehicle (10) by a connected combustion engine (14) in a two-wheel drive mode and by a four-wheel drive mode. The control system (1) also has a control device (26) for controlling a second electric axle drive device (12) for driving a second axle of the vehicle in a four-wheel drive mode. The control device (26) is connected to the engine control device (28) for passing on at least one characteristic diagram to the engine control device (28).

Abstract: A drive system for a vehicle includes a motor, an internal combustion engine, a generator, a power distribution mechanism distributing a driving force of the internal combustion engine to driving wheels and the generator, an electronic control unit controlling the motor and the internal combustion engine, and rotation members connected to first driving wheels constituted by one of front wheels and rear wheels and including an output element of the power distribution mechanism, wherein the internal combustion engine driving the first driving wheels via the power distribution mechanism, the motor driving second driving wheels not driven by the internal combustion engine, the rotation members are driven by the internal combustion engine.

Abstract: A hydraulic transaxle comprises a transaxle casing for supporting left and right axles, a pair of hydraulic motors disposed in the transaxle casing so as to drive the respective left and right axles, hydraulic ports provided in the transaxle casing so as to fluidly connect the pair of hydraulic motors in parallel to a common hydraulic pump, and a system for restricting or canceling differential rotation of the pair of hydraulic motors.

Abstract: A hydraulic motor unit according to the present invention includes an electric motor having an electric motor main body that is electrically controlled, an electric motor case that accommodates the electric motor main body and an electric motor main body output shaft that is rotated around an axis line thereof by the electric motor main body, the electric motor case being detachably mounted to the motor housing, wherein mounting of the electric motor to the motor housing causes the electric motor main body output shaft to be operatively connected to the first end of the control shaft so that the control shaft is rotated around the axis line in accordance with rotation of the electric motor main body output shaft.

Abstract: A torque distribution system is provided for a vehicle that uses a planetary gear set, an electric motor, and a torque-transmitting mechanism to control a torque difference between two axially-aligned wheels on a vehicle. The torque distribution system includes a planetary gear set having a first, a second, and a third member. The torque-transmitting mechanism is selectively engagable to connect the first and second members of the planetary gear set for common rotation. The second and third members of the planetary gear set are continuously operatively connected with the first and second rotatable connecting elements, respectively. The motor is continuously connected with the first member of the planetary gear set such that the motor adds or subtracts torque to the first member when the motor is energized and also adds or subtracts torque to the second member when the motor is energized and the torque-transmitting mechanism is engaged.

Abstract: The invention relates to a four wheel drive hybrid vehicle provided with at least one power train on each wheel set, a first power train (1) including at least one heat engine, a second power train (2) including at least one electric machine, the vehicle also being provided with a friction braking system on each drive wheel and sensor (7).

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 driving vehicle comprises front and rear transaxles incorporating respective hydraulic motors, and a pump unit separated from the front and rear transaxles. The pump unit incorporates a hydraulic pump having a pump shaft. A hydraulic circuit is formed by piping between the pump unit and the front and rear transaxles so as to circulate hydraulic fluid between the hydraulic pump and the hydraulic motors. A reservoir tank of the hydraulic fluid is connected to the hydraulic circuit by piping. A first cooling fan blowing air away from the pump unit and a second cooling fan blowing air toward the pump unit are disposed oppositely to each other with respect to the pump unit and drivingly connected to the pump shaft. At least a pipe for the piping of the hydraulic circuit and the reservoir tank passes an area blown by each of the first and second cooling fans.

Abstract: A four-wheel drive electric vehicle is provided. The vehicle comprises a chassis and a power system. The power system comprises batteries, an electric motor, a DC-DC converter and an electric motor controller which are electrically connected, and the chassis comprises a frame, a transmission/transfer case, a drive shaft, a front axle assembly as well as a rear axle assembly. The transmission/transfer case, the front axle assembly and the rear axle assembly are mounted on the frame. The transmission/transfer case is connected with the rear axle assembly directly and with the front axle assembly via the drive shaft. Under the control of the electric motor controller, the electric motor is driven to rotate by the batteries, whereby a power is transferred from the motor to the transmission/transfer case, and a part of the power is transferred to the rear axle assembly with the other part transferred to the front axle assembly via the drive shaft.

Abstract: A hydrostatic transaxle comprises: a motor casing; at least one hydraulic motor disposed in the motor casing; at least one output shaft disposed in the motor casing so as to be driven by the at least one hydraulic motor; and a pair of steerable wheel support units attached onto respective opposite ends of the motor casing. Each of the steerable wheel support units includes an axle, a steerable casing, a wheel, and a steering arm. In each of the steerable wheel support units, the axle is drivingly connected to the at least one output shaft, the steerable casing is substantially horizontally rotatable relative to the motor casing, the wheel is attached on an outer end of the axle outside of the steerable casing, and the steering arm is rotatably integrally provided on the steerable casing.

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 machine is provided. The machine includes an engine, an engine speed sensor, a transmission, a transmission status sensor, a pump, and a controller. The engine speed sensor is configured to sense the speed of the engine. The transmission is coupled to the engine. The transmission status sensor is configured to sense the status of the transmission. The pump is coupled to the engine and has a first torque mode and a second torque mode. The controller is in communication with the engine speed sensor and the transmission status sensor and is operable to automatically switch the pump from the first torque mode to the second torque mode based on the engine speed and the transmission status.

Abstract: The invention describes vehicles where the steering effect of the driver-selected wheel angles is made identical to the steering effect of positively and independently driving the driven wheels. Means of delivering most of the power to each of the driven wheels by means of shaft drives is also described. Here speed-correcting differentials are close coupled to each driven wheel where the first input to the said differentials is by means of shaft drives, and the second input to the said differentials is provided by means of speed-correcting hydraulic or electric motors.

Abstract: A utility vehicle is disclosed having an electric drive. The drivetrain is comprised of batteries, a motor, a transaxle driven by the motor, a rear differential driven by the transaxle, and a prop shaft which is driven by the transaxle and drives a front differential. The batteries are provided in two groups and are supported on the frame of the vehicle.

Abstract: A utility vehicle is disclosed having an electric drive. The drivetrain is comprised of batteries, a motor, a transaxle driven by the motor, a rear differential driven by the transaxle, and a prop shaft which is driven by the transaxle and drives a front differential. The batteries are provided in two groups and are supported on the frame of the vehicle.

Abstract: A four wheel drive system for bilaterally symmetric vehicles has separate controlled drive speed and direction for each wheel. Each drive system is operable to independently drive each wheel. The rear wheels of the vehicle are steering wheels which are connected with the vehicle frame for independent rotation about a vertical axis. Steering and driving of the wheels is controlled by a controller. The combination of controlled steering for the rear wheels through many degrees about their vertical axes and individual power to all four wheels provides the vehicle with a zero turning radius for improved mobility as well as improved traction on unstable surfaces.

Abstract: A control system for a vehicle having first and second wheels is provided that includes a differential apparatus adapted to distribute torque between the first and second wheels and a traction controller for controlling operation of the differential apparatus from vehicle launch up to a predetermined vehicle speed. The traction controller is configured to engage the differential apparatus in a first operating state according to at least one vehicle operating parameter indicative of a low traction operating condition and to further control engagement of the differential apparatus in a second vehicle operating state during the low traction operating condition according to a difference between an actual vehicle yaw rate and a predetermined target vehicle yaw rate. The control system also includes a stability controller for controlling engagement of the differential apparatus at or above the predetermined vehicle speed.

Abstract: A steering system (10) for a vehicle, such as a gantry crane (12). The gantry crane (12) generally includes a support structure (14) having a first front wheel (32) and a second opposing front wheel (36) connected proximate a front portion of the crane (12), and a first rear wheel (30) and a second opposing rear wheel (34) connected proximate a rear portion of the crane (12). A control system connected to the crane includes a user interface (111) electronically coupled to a command potentiometer (114) and a programmable controller responsive to the command potentiometer for controlling the angular position of each of the first front wheel (32), the second front wheel (36), the first rear wheel (30) and the second rear wheel (34) to effect a steering mode selected through the user interface (111).

Abstract: A control device for a power transmitting device for four-wheel drive hybrid-vehicle is provided capable of preventing the occurrence of negative torque resulting from power generation control of a second electric motor MG2. Drive-force control means 72 executes a control such that rear-wheel output torque Tpr of rear wheels 40 falls in a positive torque when first and second electric motors MG1 and MG2 execute power generation controls, thereby preventing torques of front and rear wheels 34 and 40 from orienting in different directions. Accordingly, the front and rear wheels 34 and 40 have torques oriented in the same direction, thereby favorably preventing discomfort feeling during a vehicle running.

Abstract: The invention relates to a steering system for an agricultural or industrial utility vehicle, especially for a tractor. An electric drive (22, 24) is provided for each half of an axle, preferably a front axle (20), of the utility vehicle (10). Said electric drive can be driven by at least one wheel (26) associated with the each axle half. The electric drive (22, 24) can be controlled in such a manner that predetermined torque can be transmitted from the electric drive (22, 24) to the wheel (26) which is being driven. Preferably, the wheels (14) associated with a mechanical drive axle, particularly a rear axle (12) of the utility vehicle (10), can be driven by a mechanical drive (16, 18) of the utility vehicle (10). The invention also relates to a method for operating a steering system.

Abstract: An agricultural combine for supporting an agricultural header and carrying that agricultural header to a field to harvest a crop. The combine includes a chassis, front and rear drive wheels, a hydraulic motor, a device for sensing and a controller. The front and rear drive wheels support the chassis. The hydraulic motor is drivingly coupled to the front wheels. The device for sensing senses a presence of a header mounted to the combine. The controller is configured to monitor the device for sensing and to change the specific displacement of the hydraulic motor dependent upon the presence of the agricultural header.

Abstract: An energy storage type of differential hybrid power distribution system to drive an all wheel driving carrier; a revolution output end of an internal combustion engine (or any other revolution power source) to drive the front wheel through an intermediate transmission and control interface device, and to also drive an input end of the energy storage type of differential hybrid power device to output kinetics to further drive the rear wheel; and an electro-mechanical unit functioning as a generator and a motor being disposed in the energy storage type of differential hybrid power device to regulate the power distribution between the front wheel and the rear wheel by controlling the electro-mechanical unit to operate as a motor or as a generator.

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: An object of the invention is to change a layout structure of a hydraulic continuously variable transmission apparatus (HST) particularly constituting a hydromechanical continuously variable transmission apparatus (HMT) as a continuously variable transmission apparatus, thereby achieving a simplification of structures of a working vehicle and a traveling drive system, and an easiness of a maintenance. In a working vehicle provided with an HMT structured such as to combine an HST and a planetary gear mechanism as the traveling drive system so as to output and rotate a power of an engine while shifting gear, the HST is provided with a hydraulic pump and a hydraulic motor integrally in a front wall of a transmission case, and is arranged in an upper side of a transmission shaft transmitting the power to the transmission case from the engine.

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: An energy storage type of dual-drive coupled power distribution system adapted to an all wheel driving (AWD) transportation means having a revolution output end from an internal combustion engine that drives front wheel through a front-wheel transmission assembly by means of an intermediate transmission and control interface or a coupling device providing gear-changing or clutching function, connects the revolving kinetics to drive the revolution input end of a dual-drive type of electromagnetic coupling drive device, and further drives the rear wheel through the other revolution output end of the dual-drive type of electromagnetic coupling drive device made in the construction of a revolving dual-end shaft with both end shafts respectively incorporated to a revolving magnetic field structure and a revolving rotor structure to regulate the power distribution between the front wheel and the rear wheel while being subject to the manipulation by a control device.

Abstract: In a driving force control apparatus for an automotive vehicle employing an engine that drives a main drive wheel, a generator driven by the engine, and a motor driven by an electric power output generated by the generator to drive a subsidiary drive wheel, a subsidiary-drive-wheel acceleration slip estimation circuitry is provided to estimate a subsidiary-drive-wheel acceleration slip rate. An electric power output suppression circuitry is provided to suppress the electric power output of the generator when the estimated subsidiary-drive-wheel acceleration slip rate exceeds a predetermined slip rate. Also provided is a subsidiary-drive-wheel acceleration-slip period engine output torque reduction circuitry that reduces an engine output torque responsively to suppressing the electric power output.

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 hydraulically driven vehicle comprises: a first transaxle disposed at one of front and rear portions of the vehicle, wherein the first transaxle incorporates a first hydraulic motor for driving a first axle; a second transaxle disposed at the other of the rear or front portion of the vehicle, wherein the second transaxle incorporates a second hydraulic motor for driving a second axle; a hydraulic pump for supplying fluid to the first and second hydraulic motors; a mower; a duct for transferring grass mowed by the mower, wherein the first transaxle is disposed above the duct; and a vertical power train interposed between the first axle and an axial center shaft of a wheel driven by the first axle, wherein the power train is disposed on a lateral outside of the duct.

Abstract: An energy storage type of differential mixed power distribution system to drive an all wheel driving carrier; a revolution output end of an internal combustion engine (or any other revolution power source) to drive the front-end load through an intermediate transmission and control interface device, and to also drive an input end of the energy storage type of differential mixed power device to output kinetics to further drive the rear-end load; and an electro-mechanical unit functioning as a generator and a motor being disposed in the energy storage type of differential mix power device to regulate the power distribution between the front-end and the rear-end loads by controlling the electro-mechanical unit to operate as a motor or as a generator.

Abstract: A driving-force distribution control apparatus for a vehicle includes a first motor adapted to drive one of front wheels and rear wheels, as main drive wheels; a second motor adapted to drive another of the front wheels and the rear wheels, as auxiliary drive wheels; an engine adapted to drive the main drive wheels; a battery connected electrically with the first motor and the second motor; an upper-limit output setting section configured to set an upper limit output of the battery in accordance with a charge state of the battery; and a driving-force distribution control section. This driving-force distribution control section is configured to control an output of the first motor and an output of the second motor in accordance with a running condition of the vehicle, to bring a steer characteristic of the vehicle closer to a neutral steer.

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: A work machine with an engine control device is provided, which is capable of ensuring fine controllability and providing further improved fine controllability with a simple construction. To this end, the work machine includes: an engine control device for controlling the output of an engine in accordance with each of a plurality of operation modes which are set according to the contents of operations; and operation mode selector switches for selecting any one of the plurality of operation modes. If the operation mode selector switches select, from the plurality of operation modes, an operation mode for setting a set revolution speed for the engine to a relatively low value, the engine control device performs isochronous control for maintaining the revolution speed of the engine to a constant value irrespective of load fluctuations.

Abstract: An articulated vehicle with a working device has a first frame having a prime mover mounted thereon and supporting a first transaxle apparatus. The first transaxle apparatus includes an input shaft receiving power from the prime mover, a pair of first axles, and a hydrostatic transmission. The hydrostatic transmission comprises a variable hydraulic pump, a first hydraulic motor fluidly connected to the hydraulic pump via a fluid passage, and a housing with a flexible port fluidly connected to the fluid passage. The second transaxle apparatus includes a pair of second axles having different lengths and a second hydraulic motor. The second hydraulic motor is fluidly connected via piping to a directionally adjustable connection portion of the flexible port. Proximal ends of the first and second frames with respect to the vehicle are coupled to each other so that the first and second frames are rotatable around a vertical axis relative to each other when steered.

Abstract: A hydrostatic transaxle, comprises: a transaxle casing; a pair of left and right axles disposed in the transaxle casing; a pair of hydraulic motors for driving the respective axles; and a pair of left and right steerable drive wheels disposed on left and right outsides of the transaxle casing so as to be drivingly connected to the respective axles. The hydraulic motors are disposed in the housing so as to be fluidly connected to a common hydraulic pressure source in parallel to each other. One of the hydraulic motors is a fixed displacement hydraulic motor, and the other is a variable displacement hydraulic motor. Displacement of the variable displacement hydraulic motor is changed according to change of steered angles of the drive wheels.

Abstract: A torque distribution system is provided for a vehicle that uses a planetary gear set, an electric motor, and a torque-transmitting mechanism to control a torque difference between two axially-aligned wheels on a vehicle. The torque distribution system includes a planetary gear set having a first, a second, and a third member. The torque-transmitting mechanism is selectively engagable to connect the first and second members of the planetary gear set for common rotation. The second and third members of the planetary gear set are continuously operatively connected with the first and second rotatable connecting elements, respectively. The motor is continuously connected with the first member of the planetary gear set such that the motor adds or subtracts torque to the first member when the motor is energized and also adds or subtracts torque to the second member when the motor is energized and the torque-transmitting mechanism is engaged.

Abstract: An energy storage type of dual-drive coupled power distribution system adapted to an all wheel driving (AWD) transportation means having a revolution output end from an internal combustion engine that drives front-end load through a front-end transmission by means of an intermediate transmission providing gear-changing or clutching function and a control interface or coupling device; and to couple to revolution input end of a dual-drive type of electromagnetic coupling device, further to drive rear-end load through the other revolution output end of the dual-drive type of electromagnetic coupling drive device made in the construction of a revolving dual-end shaft with both end shafts respectively incorporated to a revolving magnetic filed structure and a revolving rotor structure to regulate the power distribution between the front-end and the rear-end loads while being subject to the manipulation by a control device.

Abstract: A working vehicle comprises: a power source having an output shaft; axles; a cargo deck; and a transmission apparatus for driving axles disposed below the cargo deck. The transmission apparatus includes an input shaft drivingly connected to the output shaft of the power source, a hydro-mechanical stepless transmission driven by the input shaft, and a differential gear assembly differentially connecting the axles to each other. The hydro-mechanical stepless transmission includes a planetary gear assembly and a hydrostatic stepless transmission drivingly connected to the planetary gear assembly. The differential gear assembly is drivingly connected to the hydro-mechanical stepless transmission.

Abstract: A method is provided for controlling an all-wheel-drive vehicle. The method includes providing an aggression signal and determining a desired speed ratio based on the aggression signal. An output speed signal corresponding to the determined desired speed ratio is generated.

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 transaxle apparatus for a four-wheel drive vehicle, comprises: a hydraulic pump; a housing; a hydraulic motor disposed in the housing so as to be driven in response to fluid from the hydraulic pump; an axle extended outward from the housing; a drive train disposed in the housing so as to drivingly connect the hydraulic motor to the axle; and a power take-off shaft disposed in the housing perpendicularly to a rotary axis of the hydraulic motor so as to be drivingly connected to the drive train and extended outward from the housing.

Abstract: A hydraulic driving vehicle comprises front and rear transaxles incorporating respective hydraulic motors, and a pump unit separated from the front and rear transaxles. The pump unit incorporates a hydraulic pump having a pump shaft. A hydraulic circuit is formed by piping between the pump unit and the front and rear transaxles so as to circulate hydraulic fluid between the hydraulic pump and the hydraulic motors. A reservoir tank of the hydraulic fluid is connected to the hydraulic circuit by piping. A first cooling fan blowing air away from the pump unit and a second cooling fan blowing air toward the pump unit are disposed oppositely to each other with respect to the pump unit and drivingly connected to the pump shaft. At least a pipe for the piping of the hydraulic circuit and the reservoir tank passes an area blown by each of the first and second cooling fans.