Abstract: A propel system of an agricultural vehicle has an active pump displacement control system for equalizing or balancing pressure output of hydrostatic pumps of a tandem pump propel arrangement. The active pump displacement control system may include a pressure sensor(s) for determining output pressure of hydrostatic pumps and use the output pressure values within a feedback loop to provide coil input values of coils that control displacement of the hydrostatic pumps so that the pressure outputted by the hydrostatic pumps can be equalized in real-time while on the go during use of the agricultural vehicle.

Abstract: A control mechanism for a stepless transmission is a control mechanism connected to a manipulation lever in a stepless transmission and disposed outside a housing of the transmission.

Abstract: A centre seeking actuator having an outer cylinder, a slave cylinder slidably disposed within the outer cylinder, and a rod assembly having a piston slidably disposed within the slave cylinder and a rod extending from the piston to a point outside the outer cylinder. One or more first dynamic seals are arranged to act on a side wall of the rod to inhibit working fluid leaking from the outer cylinder, and one or more second dynamic seals are arranged to act on a sidewall of the slave cylinder to inhibit working fluid leaking from the outer cylinder.

Abstract: A compressor has a crankcase in which a crankshaft is rotatably mounted in a crankspace. The crankcase contains at least one cylinder space in which a piston, mounted eccentrically on the crankshaft by way of a connecting rod, can be driven in reciprocating motion. The crankshaft is connected, via a gearing having a modulus m, to a drive source, wherein the gear wheel arranged on the crankshaft engages with the gear wheel on the drive source. The axis of rotation of the crankshaft is offset with respect to the center axis of the cylinder space by an amount dl which is a whole multiple of m/2. The center axis of the cylinder space is understood as the axis which proceeds from the center point of the base area of the cylinder space, perpendicular to this base area, and along which the piston moves.

Abstract: A portable workstation includes a frame, a plurality of wheels coupled to the frame, a handle coupled to the frame, a pneumatic inlet port coupled to the frame and a pump coupled to the frame and pneumatically coupled to the pneumatic inlet port. The pump pumps hydraulic fluid. A plurality of hydraulic outlet ports is coupled to the frame and is hydraulically coupled to the pump.

Abstract: Various embodiments of a hydraulic cylinder assembly, cylinder liner member and a hydraulic manifold for use with the hydraulic cylinder assembly reduce the need for external plumbing from the rear of the hydraulic cylinder assembly to the front of the hydraulic cylinder assembly. The cylinder liner member may include three bores that convey fluid from the manifold from the rear of the hydraulic cylinder assembly to the front of the assembly, conveying fluid to the retract volume of the cylinder.

Abstract: A piezohydraulic actuator system includes four chambers: a first chamber defined by a drive bellows filled with a hydraulic fluid and movable by a piezo actuator, a second chamber defined by a hydraulic cylinder filled with the hydraulic fluid, which defines a first output; a third chamber defined by an output bellows filled with the hydraulic fluid, which defines a second output; and a fourth chamber defining a reservoir of the hydraulic fluid. The drive bellows is hydraulically connected via a first check valve to the second chamber. A hydraulic piston in the hydraulic cylinder is coupled mechanically to the output bellows. The drive bellows is hydraulically connected via a second check valve to the fourth chamber. The hydraulic fluid reservoir is hydraulically connected via a third check valve to the output bellows, and the hydraulic cylinder is hydraulically connected via a fourth check valve to the output bellows.

Abstract: A radial piston device includes a housing, a pintle attached to the housing and having a pintle shaft, a rotor rotatably mounted on the pintle shaft and having cylinders, pistons displaceably received in the cylinders, and a drive shaft coupled to the rotor and rotatably supported within the housing. The radial piston device includes mechanisms for reducing a pressure loss of hydraulic fluid flowing into the pintle shaft.

Abstract: A hydraulic cylinder may include a cylindrical body, a first piston rod coupled with a first end of the body, and a second piston rod coupled with a second end of the body. The first piston rod may include a cavity with an inner diameter, and the second piston rod may have an outer diameter that is smaller than the inner diameter of the cavity. The hydraulic cylinder is adjustable from a closed position, in which a length of the first piston rod is housed inside the body and a length of the second piston rod is housed inside the cavity of the first piston rod, to an extended position, in which the first piston rod extends through the first end of the body and the second piston rod extends through the second end of the body.

Abstract: A pump configured to move fluid from one location to another location is provided. The pump includes a pump housing. The pump housing is composed of a wall structure. The wall structure includes a first laminar portion of a thickness of the wall structure composed of a resin that does not include any reinforcing fibers. The wall structure also includes a second laminar portion of the thickness of the wall structure that is composed a resin with reinforcing fibers dispersed through the resin.

Abstract: On inner wall surfaces of a head cover and a rod cover of a fluid pressure cylinder, respective pluralities of first and second spigot pins are installed to project out from the inner wall surfaces. The first and second spigot pins are disposed on circumferences of a predetermined diameter that internally contact or inscribe the cylinder tube. Further, when the cylinder tube is assembled with respect to the head cover and the rod cover, by the flange members of the first and second spigot pins inscribing the inner circumferential surface thereof, the cylinder tube is positioned and assembled coaxially with respect to the centers of the head cover and the rod cover.

Abstract: Pressure compensating valves not fully closing at the stroke end are employed, and upon the operator's operation for the traveling, pilot primary pressure is reduced and supplied to remote control valves 34c-34h of non-travel operating devices. Thus, the inflow of the hydraulic fluid into non-travel actuators is suppressed and a necessary amount of hydraulic fluid for travel motors is secured in travel combined operation. Accordingly, when saturation occurs in a construction machine's hydraulic drive system performing the load sensing control due to combined operation with a great load pressure difference between two actuators, deceleration/stoppage of an actuator on the low load pressure side is prevented by preventing full closure of the pressure compensating valve on the low load pressure side, while also preventing deceleration/stoppage of a high load pressure actuator by securing a necessary amount of hydraulic fluid for the high load pressure actuator.

Abstract: An HST control mechanism includes a rotary member, a servo unit, a telescopic member, and a biasing device. The rotary member for controlling a displacement of a hydrostatic transmission (HST) is pivoted outside of a casing incorporating the HST. The servo unit includes a telescopically movable actuator and a valve controlling the telescopic movement of the actuator. The actuator is interlockingly connected to the rotary member. The servo unit is pivotally supported on the casing via a first pivot. The servo unit rotates centered on the first pivot as the rotary member rotates according to the telescopic movement of the actuator hydraulically controlled by the valve. The telescopic member is pivotally supported on the casing via a second pivot. The telescopic member is provided with the biasing device that biases the telescopic member and the rotary member toward a position corresponding to a neutral state of the HST.

Abstract: An accumulator piston, in particular a piston for a pressure medium accumulator of a hydraulic unit of an electronically slip-controllable vehicle brake system, includes a cylindrical piston shaft, and a piston head covering the piston shaft. The piston head includes a circumferentially closed blind-hole-shaped recess having an opening. A cross section of the recess in a region of the opening has at least one smaller dimension than a cross section in a region of a base of the recess opposite the opening. The recess forms a mechanism configured to separate particles out from the pressure medium.

Abstract: The distributor phase shifter for a hydraulic pump motor (300) is provided for a hydraulic pump motor (1) which includes a pump motor housing (2) and a pump motor central rotor (3) to which an input-output distributor (43) presents an input-output angular collector of an internal conduit (44) and an input-output angular collector of an external conduit (89), which phase shifter includes a phase shift acting element (301) which is supported on the housing of the pump motor (2) in order to make the input-output distributor (43) rotate around its longitudinal axis and over a determined angular range.

Abstract: A work machine includes a mechanical arm and a hydraulic actuator coupled to the mechanical arm to move the arm between a first position and a second position. A valve is in fluid communication with the hydraulic actuator for supplying fluid to the hydraulic actuator. A pump is configured to discharge fluid to the valve. An engine is operatively connected to the pump. A coolant system is in thermal communication with the engine and includes a temperature sensor. A controller is in communication with the pump and the temperature sensor. The controller is configured to transmit a control signal to the pump to modify a flowrate of the pump and to adjust the flowrate of the pump in response to a signal from the temperature sensor that a temperature is at or above a set temperature value.

Abstract: Hydraulic equipment of the type that can be fixed to a moving arm of an operating machine. The equipment has a support structure connected or connectable to a moving arm of an operating machine, at least one hydraulic motor for the rotation of a working element, a feed pipe connected or connectable to a hydraulic circuit of the supporting operating machine to supply a flow of working fluid to the hydraulic motor, and a drainage unit for the drainage of working fluid from the hydraulic motor. The equipment may optionally include a pressure detector in the drainage unit and a shut-off valve operationally associated with the pressure detector in such a way as to interrupt the flow of working fluid to the hydraulic motor when predetermined pressure conditions are detected.

Abstract: A device for cooling and filtering hydraulic fluid comprises a first chamber that includes a fluid inlet connection, a filter cartridge, a bypass manifold, and an inlet to a cooler; and, a second chamber that includes an outlet from the cooler and a fluid outlet connection. The cooler interconnects the first and second chambers through the inlet of the first chamber and the outlet of the second chamber. The bypass manifold is configured to return fluid entering the fluid inlet connection to the fluid outlet connection when a first pressure differential at the bypass manifold is above a first value, and to pass the fluid onto the filter cartridge when the first pressure differential at the bypass manifold is at or below the first value.

Abstract: A gas passage switching structure for a pneumatic rotary hand tool includes a pneumatic motor and a revolving valve disposed in a device case. The pneumatic motor has an input ending surface. A forward gas inlet and a reverse gas inlet are formed and spaced apart on the input ending surface. The revolving valve has a gas supply surface. A gas supply port and a discharge port are formed and spaced apart on the gas supply surface. The gas supply surface and the input ending surface are arranged along an axis line in the device case adjacent or in contact with the arrangement so that it allows the pneumatic motor to drive the forward and reverse rotation by the high pressure air flow along the fluid passage in the axis line direction.

Abstract: The invention relates to a hydraulic drive (1) comprising a working cylinder (2) and a travel cylinder (3) which is mechanically connected to the working cylinder (2). The working cylinder (2) and the travel cylinder (3) each comprise an upper and a lower cylinder chamber (21, 22, 31, 32), and all four cylinder chambers (21, 22, 31, 32) of the working and travel cylinder (2, 3) are connected to one another in a suitable manner in a closed pressure circuit (4) which is filled and prestressed with a hydraulic fluid (F). A rotational speed-variable hydraulic machine (5) with a first and second pressure connection (51, 52) is arranged in the pressure circuit (4) in order to conduct the hydraulic fluid (F) between the individual cylinder chambers (21, 22, 31, 32) of the working and travel cylinder (2, 3) during the operation (B) of the hydraulic drive (1).