Abstract: A piston pump includes a first biasing mechanism configured to bias a swash plate in accordance with supplied control pressure, a second biasing mechanism configured to bias the swash plate against the first biasing mechanism, and a regulator configured to control the control pressure led to the first biasing mechanism in accordance with discharge pressure of the piston pump, wherein the second biasing mechanism has a pressure chamber to which the discharge pressure is led, and a control piston configured to be biased toward the swash plate by the discharge pressure led to the pressure chamber, and the regulator has a biasing member configured to bias the control piston toward the swash plate, and a control spool configured to be moved in accordance with biasing force of the biasing member, the control spool being configured to adjust fluid pressure.

Abstract: An axial piston machine of oblique axis design has a pivot angle that is adjustable via a set piston and a control valve and includes a first valve slide that is linearly movable relative to a first valve axis and is connected at two opposite ends to a first or a second fluid port. The first valve slide has a central region that defines a control point at which the lower of pressures at the first and second fluid ports act. The control point is connected via a fixed first throttle and a second throttle to a housing interior. A second valve slide that is linearly movable relative to a second valve axis is configured to adjust the second throttle. The first valve axis is arranged between the set piston and the control valve or a region of the control valve and is oriented transverse to the adjusting axis.

Abstract: A stump grinder has a grinding arm that durably mounts a rotatable grinding wheel by securing the drive shaft of a motor to the grinding wheel such that a pair of bearings within the motor support one side of the grinding wheel and by supporting the other side of the grinding wheel with a stub shaft received within a third bearing. The grinding arm is laterally offset on the frame of the stump grinder to have a swing angle that is not symmetrical relative to the width of the frame, but with the swing angle starting at one side of the frame and then traversing across substantially the entire width of the frame to improve the ability of the operator to see the grinding wheel. A single joystick is movable in orthogonal directions corresponding to desired up and down and side-to-side pivoting motions of the grinding arm. The joystick includes a depressible trigger for starting and stopping the operation of the grinding wheel.

Abstract: The disclosure is directed to a transmission, and more particularly to a semi-Continually Variable Transmission (sCVT), a semi-Continuous, Variable Displacement Motor, a semi-Continuously Reciprocating Multiplex Pump (sCVDP) and an infinitely variable transmission (IVT).

Abstract: A method of controlling a piston pump is disclosed. The method includes actuating a plurality of pistons housed within a cylinder barrel to cause each of the plurality of pistons to engage in reciprocating motion. Fluid supplied to each of the pistons may be regulated by changing a clock position of an intake cam ring to cause a plurality of intake valves to open and close relative to the clock position of the intake cam ring. Fluid discharged by each of the pistons may be regulated by changing a clock position of an exhaust cam ring to cause a plurality of exhaust valves to open and close relative the clock position of the exhaust cam ring.

Abstract: An electronic controller for a variable ratio transmission and an electronically controllable variable ratio transmission including a variator or other CVT are described herein. The electronic controller can be configured to receive input signals indicative of parameters associated with an engine coupled to the transmission. The electronic controller can also receive one or more control inputs. The electronic controller can determine an active range and an active variator mode based on the input signals and control inputs. The electronic controller can control a final drive ratio of the variable ratio transmission by controlling one or more electronic solenoids that control the ratios of one or more portions of the variable ratio transmission.

Abstract: A hydraulic motor includes a motor mechanism that rotates by hydraulic liquid pressure led from a hydraulic liquid pressure source. The hydraulic motor includes a casing that defines a casing chamber which accommodates the motor mechanism, a brake mechanism that brakes the rotation of the motor mechanism, a brake release actuator that releases the braking of the brake mechanism by a brake release pressure led from the hydraulic liquid pressure source, and a throttle passage that is in communication with the casing chamber and extracts a portion of hydraulic liquid that is led into the brake release actuator and leads it to the casing chamber.

Abstract: A method for controlling an automated clutch, which comprises a hydraulic clutch actuating system having a hydrostatic actuator, the pressure of which is detected. The method includes using the pressure of the hydrostatic actuator to adapt the characteristic curve of the clutch.

Abstract: The invention relates to an axial piston machine of a kind that has a plurality of pistons each reciprocating in a respective cylinder in a direction substantially parallel or at an angle less than 30 degrees to a crankshaft axis. The crankshaft axis presents a crank that is at an angle to the crankshaft axis and to which a reciprocator is mounted. The reciprocator effects the controlled movement of the pistons in their cylinders via a connection mechanism that connects each said piston with said reciprocator. The machine includes at least one pair of rotational constraint mechanisms to constrain the movement between the reciprocator and the pistons.

Abstract: The invention relates to a radial piston hydraulic motor (100) and to a method in the control of a radial piston hydraulic motor. The radial piston hydraulic motor (100) includes a free rotation valve (50) which is built inside it and includes a spindle (19). The spindle (19) is disposed in a spindle cavity (20) and it is movable in the spindle cavity (20) such that, in a free rotation situation, shoulders of the spindle (19) block the inlet and outlet passages of working pressure. In a free rotation situation, springs (U1, U2 . . . ) press pistons (13a1, 13a2 . . . ) and press rollers (14a1, 14a2 . . . ) associated therewith to a bottom position and out of contact with a cam ring (11).

Abstract: A hydrostatic axial piston machine has a cylinder block with bores holding reciprocating pistons, a swashplate supporting the pistons, and control cams to supply the bores with hydraulic fluid. The swashplate is a pivoting cradle mounted on friction bearings in a cradle receptacle. Hydraulic fluid channels empty into the cradle receptacle and are in communication with supply channels in the cradle connected to the control cams. An actuator piston to adjust the cradle is located between two friction bearing segments of the cradle receptacle and has a toothed rack segment engaging a gearing segment on the back side of the cradle.

Abstract: Disclosed is a coupling structure between a drive shaft and a swash plate assembly in a variable capacity swash plate type compressor, which is so modified that the rotating force of the drive shaft can be transferred to a rotor and the swash plate assembly by substantially equal amounts so as to prevent the frictional of a driving unit as well as prolong life time.

Abstract: A hydrostatic variable displacement pump of swash plate construction has a cylinder block 2, in a housing 1, with displacement pistons 3 guided therein, a swash plate 4 and at least a first bearing 5 and a second bearing 6, which supports the angle adjustable swash plate 4. The housing 1 has a first opening, through which the swash plate can be introduced. The first bearing 5 has a removable outer race 13 which is designed such that, following installation of the second bearing 6 of the swash plate 4 in the bearing seat 8, it fixes said swash plate in the bearing seat 7 of the first bearing 5. The servomechanism 9, 10 is integrated in a cover 10 which closes off the housing 1 on the side of the first bearing 5.

Abstract: A drive device which has small dimensions an axial and radial directions. The small dimensions of the device are a result of a brake body of a friction brake provided in the drive device being located at least partially within an enclosure configured in a rotor.

Abstract: A hydrostatic variable displacement pump of swash plate construction has a cylinder block 2, in a housing 1, with displacement pistons 3 guided therein, a swash plate 4 and at least a first bearing 5 and a second bearing 6, which supports the angle adjustable swash plate 4. The housing 1 has a first opening, through which the swash plate can be introduced. The first bearing 5 has a removable outer race 13 which is designed such that, following installation of the second bearing 6 of the swash plate 4 in the bearing seat 8, it fixes said swash plate in the bearing seat 7 of the first bearing 5. The servomechanism 9, 10 is integrated in a cover 10 which closes off the housing 1 on the side of the first bearing 5.

Abstract: A controller-assisted, manually shifted compound transmission system (10) and range shift control method therefor. Range section (16B) shifts are normally automatically implemented by a range shifter (28) under commands (56) from a controller (54) in response to manual initiation. Under certain operating conditions ((ESMIN<OS*GR) and (ESMAX<OS*GRCLR)) automatic range downshifts without driver initiation are commanded.

Abstract: A variable displacement compressor has a housing, which defines a crank chamber, a suction chamber, and a discharge chamber. A bleed passage connects the crank chamber to the suction chamber, which allows gas to flow from the crank chamber to the suction chamber. A release valve, which is a reed valve, is located in the bleed passage. The release valve varies the opening of the bleed passage in accordance with the difference between the pressure in the crank chamber and the pressure in the suction chamber. This can prevent the pressure in the crank chamber from excessively increasing.

Abstract: A hydraulic drive in accordance with the invention includes an axial piston hydraulic motor provided for forming a power drive with a follow-up control valve provided for controlling the pressure medium supply with the follow-up control valve being electronically controlled by a desired position value presetting and mechanical actual position value acknowledgement. An electric motor is provided for the desired position value presetting which can be activated by output signals of a central CN or CNC control unit. The rotor of the axial-piston hydraulic motor is rotatably supported with a circular-cylindrical tubular section of an output shaft thereon on an outer casing surface of an axial extension which is a hollow tubular shape and forms a pivot pin for the rotor of a housing section accommodating the electric motor provided for the desired value positioning control.

Abstract: A propelling apparatus for a vehicle switchable between a four wheel drive mode and a two wheel drive mode. The apparatus comprises a hydraulic pump for driving hydraulic motors associated with front wheels and rear wheels, respectively. A shutoff valve is provided on oil lines extending between the hydraulic pump and one of the hydraulic motors, e.g. the motor associated with the front wheels. The shutoff valve is operable to establish the two wheel drive mode for driving only the rear wheels. A pumping preventive device prevents the hydraulic motor associated with the front wheels from effecting pumping action due to power transmitted from the front wheels when the shutoff valve is operated.

Abstract: An adaptive stepped compensator valve for controling hydromechanical control apparatus having high and low pressure control lines. The adaptive stepped compensator valve includes a housing having an elongated bore and a plurality of ports formed therein, a sleeve, disposed in sealed slidable engagement with the housing in the bore, and having an opening formed therein extending the length of the sleeve and direct acting main and balance spools disposed in the opening. High pressure fluid is inputed into a first chamber of the valve formed by the main spool and a second chamber formed by a balance spool. Low pressure fluid is inputted into a third chamber formed by an end of the main spool which abuts an end of the balance spool. The invention outputs a control signal based upon a detected difference in pressure between the high pressure fluid and the low pressure fluid.

Abstract: A radial piston hydraulic motor includes an in-board computer which permits monitoring and control of various operating parameters. A position code disc is associated with the shaft of the motor by means of which the position of the drive cam on the shaft, relative to the individual piston can be sensed and fed to the computer. The motor is of high versatility and performance.

Abstract: In a vehicle or device a fluid motor is employed to drive rotary members, such as wheels, propellers, tracks. The motor is provided with an arrangement which includes a control means and an axially moveable member. By utilizing the control means, for example, by a flow of fluid, the axially moveable member is used to apply an action, which is not common to the usual operation of fluid motors. The arrangement may be used to arrest the rotor of the motor from rotation when no pressure is in the driving fluid line. It may also be used to control the pitch of propellers with variable pitch arrangements. Also possible is to use the arrangement to automatically obtain an auto-rotation of rotor blades on vertical axes of vertically take off and landing vehicles, when the pressure in the fluid line to the motors for driving the motors drops below a predetermined minimum of pressure.

Abstract: An axial piston motor is provided having a mechanical friction brake incorporated in the driving flange, thereby maintaining the axial length of the motor the same as motors without a mechanical friction brake.

Abstract: An energy converter transmission uses a throughshaft clutch and a through-shaft energy converter for transfer of energy to and from a shaft. The energy converter includes a housing and a rotor mounted to a hollow coupling shaft. The energy converter can be an hydraulic, a pneumatic or an electric energy converter. A first clutch element is also mounted to the coupling shaft. A second clutch element is mounted to the main drive shaft which passes through the hollow coupling shaft. Actuation of the clutch engages the clutch elements to couple the main drive shaft to the rotor via the clutch and coupling shaft.

Abstract: A vehicle propulsion system is provided with an auxiliary hydraulic drive having a variable displacement motor connected to ground engaging wheels by a clutch. A multiple position control has a first position which causes clutch engagement and positions a motor displacement member in a position which permits fluid drive of the motor. The control has a second position which causes clutch disengagement and positions the motor displacement member in a zero displacement condition which prevents fluid drive of the motor. Preferably the control is responsive to motor output speed and reduces motor displacement as speed increases.

Abstract: A control for a variable displacement motor which utilizes a motor speed sensitive signal for moving the displacement of the motor toward a zero displacement setting position including a device for generating a conditioned variable signal representative of motor speed, circuitry for receiving said signal and upon the signal reaching a predetermined intermediate value applying the signal to the control device for motor displacement for causing reduction in motor displacement and with various devices in the circuit for modifying the variable signal to provide a desired relation between motor speed and motor displacement. Utilization of such controls individually associated with plural variable displacement motors driving vehicle wheels and driven by one pump protects against spin-out of one of the wheels.

Abstract: Disclosed is a hydraulic motor with a nutating member. The nutating member mounted for nutation on a spherical surface bearing which in turn is mounted on a casing, has first and second bevel gears on respective end faces thereof, the first bevel gear on one end face being in mesh with a bevel gear rigidly mounted on the casing while the second bevel gear on the other end face being in mesh with a bevel gear carried rigidly by a shaft. A swash plate mounted on the casing for coaxial rotation with the shaft has an inclined end face against which said one end face of the nutating member is made to contact and being pressed thereagainst under the forces of pistons so that the swash plate with the inclined end face is caused to rotate, whereby the nutating member is made to nutate. Such nutation of the nutating member due to extension and retraction of the pistons under hydraulic pressure in a predetermined sequence results in the rotation of the shaft or the casing with respect to each other.