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| Number | Title | Issue Date |
| 6220144 | Extended slipper for hydrostatic pump and motor rotating cylinders A cylinder block for a hydrostatic transmission has a rotatable piston housing with a plurality of piston bores arranged in a circular pattern in the housing. A piston element is slidably mounted in each bore. Each of the piston elements has an outer end ... | 04/24/2001 |
| 6203283 | Single piece yoke stroking device for bent axis type hydraulic pumps and variable motors A device for varying the displacement of a variable displacement bent axis unit includes a one-piece yoke having a bucket portion adapted to carry a cylinder block kit of the bent axis unit, a trunnion bearing portion for swing control on one side of the ... | 03/20/2001 |
| 6202783 | Hydrostatically driven vehicle with retarder valve A vehicle having a hydrostatic drive and a hydraulic control apparatus, in which the hydrostatic drive has a variable displacement hydraulic pump and a hydraulic motor in a closed circuit, an internal combustion engine for driving the hydraulic pump and a... | 03/20/2001 |
| 6176086 | Hydrostatic transmission in one housing A hydrostatic transmission includes a hollow one-piece cast housing having an internal compartment and an outer shell with opposite sides and opposite ends; a central wall in the housing dividing the compartment into separate sub-compartments and being in... | 01/23/2001 |
| 6145287 | Hydrostatic circuit for harvesting machine The multiple pump apparatus includes first and second variable displacement closed circuit pumps. The multiple pump apparatus pressurizes fluid to be subsequently supplied to drive load devices. The first and second pumps each have fluid communication lin... | 11/14/2000 |
| 6135231 | Method and means for providing a steer-assist and anti-spin system for hydrostatically propelled vehicles A hydraulically propelled vehicle has a vehicle body with a pair of forward wheels and a pair of rearward wheels. A single fluid displacement pump is operatively connected to each wheel. A fluid displacement motor is connected to each wheel. The pump is f... | 10/24/2000 |
| 6129169 | Mobile work vehicle with compact axle assembly A mobile work vehicle with at least one driven axle assembly is connected to and driven by just one integrated hydraulic motor. The hydraulic motor is a low-speed radial-piston motor which has a hollow shaft of which the axis of rotation is concentric wit... | 10/10/2000 |
| 6119456 | Displacement control with load feedback and stroke control for a hydraulic unit A displacement control device for a hydraulic unit includes: an actuator for applying operator input force to a movable member for varying displacement of the unit; a control valve having a spool and a sleeve displaceable with respect to each other, one o... | 09/19/2000 |
| 6109030 | Apparatus and method for ganging multiple open circuit pumps A ganged pumping apparatus includes first and second variable displacement open circuit pumps, each having a load sensing control and a servo actuator together for changing the fluid displacement of each pump respectively. The load sensing controls being ... | 08/29/2000 |
| 6082410 | Port plug A plug for a threaded port is formed of resilient elastomeric material and has upper and lower ends. A smooth non-threaded outer cylindrical wall is disposed between the ends. The outer cylindrical wall has an outer diameter sufficient to frictionally eng... | 07/04/2000 |
| 6033188 | Means and method for varying margin pressure as a function of pump displacement in a pump with load sensing control A pump system includes a variable fluid displacement pump having a pressure line which is connected to a pressure load and connected to a load sensing control. A variable orifice is located downstream from the load sensing control. The variable orifice is... | 03/07/2000 |
| 5983781 | Sliding bearing with self-adjusted load bearing capacity A sliding bearing, particularly for slippers of hydrostatic piston machines, with a support having a supporting surface on which slides a sliding piece having a sliding and sealing surface. Between the supporting surface and the sealing part of the slidin... | 11/16/1999 |
| 5983737 | Kit for a power takeoff assembly for converting same to include selectively controlled multiple power takeoff shafts A kit for converting a base transmission having a mid PTO shaft and a detachable original equipment rear cover into an optional configuration transmission having a rotatable mid PTO shaft and a rotatable rear PTO shaft that are both selectively drivable s... | 11/16/1999 |
| 5983776 | Two-piece slipper with balanced running face A hydraulic slipper includes a slipper body having first and second ends and a central portion therebetween. The first end terminates in a spherical-shaped head. The second end terminates in a round base portion with a hub protruding outwardly therefrom i... | 11/16/1999 |
| 5979271 | Axle driving apparatus An integrated hydrostatic transmission has a housing comprised of two separable elements detachably joined together along a substantially horizontal parting plane. A hydrostatic transmission including a hydrostatic pump, a hydrostatic motor, and a center ... | 11/09/1999 |
| 5970808 | Method of converting power takeoff assembly to include selectively controlled multiple power takeoff shafts A vehicle transmission assembly includes a power means, a clutch connected to the power means and having an output power shaft, and a plurality of gears and substantial alignment. The gears include a first gear on the power shaft meshed with a second gear... | 10/26/1999 |
| 5969520 | Magnetic ball joystick A joystick mechanism includes a housing, a substantially spherical magnetic ball rotatably mounted on the housing, a joystick shaft attached to the magnetic ball, and a pair of magnetic effect sensors operatively positioned adjacent the magnetic ball. The... | 10/19/1999 |
| 5941159 | Integral holdown pin mechanism for hydraulic power units A holddown pin mechanism for hydraulic power units has a cylindrical flat base washer having a central opening and opposite sides, a plurality of spaced elongated holddown pins have one end rigidly secured to one side of said base washer and an outer end.... | 08/24/1999 |
| 5941689 | Control system and method to control variable hydraulic pumps with a temperature sensor A control system for a variable pump and a process to control the variable pump with a circuit connected to a hydraulic motor by working lines, controlled by an electronic controller, having check valves in the circuit to allow oil flow from a charge pump... | 08/24/1999 |
| 5933795 | Speed sensing device A speed sensor for sensing the speed and direction of a hydrostatic motor or pump measures the speed, monitors an operator input, processes this information and generates a high power output to drive a solenoid valve or electrical displacement control. Th... | 08/03/1999 |
| 5921151 | Axle driving apparatus An integrated hydrostatic transmission has a housing comprised of two separable elements detachably joined together along a substantially horizontal parting plane. A hydrostatic transmission including a hydrostatic pump, a hydrostatic motor, and a center ... | 07/13/1999 |
| 5901605 | Power takeoff assembly and method of converting same to include selectively controlled multiple power takeoff shafts A vehicle transmission assembly includes a source of rotary power, a clutch connected to the power source and having an output power shaft, and a plurality of gears in substantial alignment. The gears include a first gear on the output power shaft meshed ... | 05/11/1999 |
| 5881629 | Control device for variable hydraulic machines A control device for variable hydraulic machines, and specifically for variable axial piston machines equipped with a servo system that is connected to a swash plate so that the discharge/displacement volume is infinitely variable. The hydraulic machine i... | 03/16/1999 |
| 5875630 | Hydraulic drive assembly A hydraulic drive assembly includes a variable displacement pump fluidly connected in a closed loop circuit with a motor for driving an ancillary device, such as a fan. An auxiliary pump can be operatively connected to the pump, the motor and a reservoir ... | 03/02/1999 |
| 5802931 | Axle driving apparatus An axle driving apparatus having a common housing of at least two separable pieces for a hydrostatic transmission comletely contained within the housing. A pair of oppositely-extending differentially-connected axles extend from the housing. The housing pi... | 09/08/1998 |
| 5784949 | Retaining system for slipper holddown pins An improved apparatus for retaining slipper holddown pins radially in a hydraulic unit includes a cylinder block having a plurality of holes therein for respectively receiving a corresponding plurality of elongated slipper holddown pins, each having a max... | 07/28/1998 |
| 5775453 | Traction control system and method for hydraulically propelled vehicles A traction control system used to control a hydraulically propelled vehicle having front and rear drive assemblies has a variable displacement hydraulic motor coupled to each drive assembly. The hydraulic motors are connected in parallel to a pump. A cont... | 07/07/1998 |
| 5703345 | Hydrostatic drive with data carrier control A control system for a hydrostatically driven vehicle comprises a hydraulic drive system having a hydraulic drive unit. An electronic control unit on the machine being driven is operatively connected to the hydraulic drive unit and is adapted to transmit ... | 12/30/1997 |
| 5697286 | Fluid pressure unit with brake means A motor or pump includes a stator and a rotor supported for rotation with respect to the stator by a bearing arrangement. The rotor has a cylinder block thereon having radial cylinder bores equipped with radially reciprocable pistons. Rollers on the pisto... | 12/16/1997 |
| 5697765 | Hydraulic motor A motor or pump includes a stator and a rotor supported for rotation with respect to the stator by a bearing arrangement. The rotor has a cylinder block thereon having radial cylinder bores equipped with radially reciprocable pistons. Rollers on the pisto... | 12/16/1997 |
| 5634526 | Hydrostatic transmission center section A center section for a hydrostatic transaxle has a generally L-shaped member having a hydrostatic pump and motor mounting surfaces thereon disposed at right angle to each other. The L-shaped member has first and second legs at right angles to each other w... | 06/03/1997 |
| 5628187 | Method to calibrate a hydrostatic transmission with electronic controls A method for putting into operation a vehicle with an electronically controlled automotive hydrostatic transmission, wherein an output current of an electronic control by means of at least one proportional pressure-reducing valve is used for generating a ... | 05/13/1997 |
| 5626204 | Hydrostatic transaxle A hydrostatic transaxle having a common housing for a hydrostatic transmission and a pair of oppositely-extending differentially-connected axles has an L-shaped center section interconnecting the pair of hydraulic displacement units constituting the hydro... | 05/06/1997 |
| 5603348 | Damped poppet valve A valve includes a body member having spaced apart first and second fluid passages and a bore in communication with the passages. The bore includes a valve seat interposed at one end of the bore between the first and second fluid passages, a discharge cha... | 02/18/1997 |
| 5593000 | Hydrostatic transaxle A hydrostatic transaxle having a common housing for a hydrostatic transmission and a pair of oppositely-extending differentially-connected axles has an L-shaped center section interconnecting the pair of hydraulic displacement units constituting the hydro... | 01/14/1997 |
| 5588805 | Vibration and pressure attenuator for hydraulic units An attenuator for a variable displacement hydraulic unit having a servo connected to a swashplate includes an oscillator connected to the servo. The oscillator includes a pipe constituting an inertial portion connected to the servo and a hose defining a h... | 12/31/1996 |
| 5577572 | Hydrostatic transmission center section An integrated hydrostatic transaxle having a common housing for a hydrostatic transmission and a pair of oppositely-extending differentially-connected axles to have the common housing provide a common sump therefor and with a specifically-shaped center se... | 11/26/1996 |
| 5560203 | Transmission control system and method A hydromechanical transmission shifting control system and method includes a hydromechanical transmission and a number of clutches connected to the transmission. A microcontroller receives various signals generated by the operator, engine, transmission, a... | 10/01/1996 |
| 5542494 | Hydrostatic transmission and axle assembly An integrated hydrostatic transaxle having a common housing for a hydrostatic transmission and a pair of oppositely-extending differentially-connected axles to have the common housing provide a common sump therefor and with a specifically-shaped center se... | 08/06/1996 |
| 5540563 | Unitary housing for double hydraulic unit A unitary housing for a hydraulic unit such as tandem pump, having a plurality of rotating groups driven in one direction about a common axis by a source of rotary power having a pair of opposite end walls generally transverse to the common axis, a contin... | 07/30/1996 |
