A system and method for machinery performing work with hydraulic actuators. Radial hydraulic pumps are aligned end-to-end along a common driveshaft axis to form a multi-pump assembly having a plurality of piston/cylinder units extending in a radial direction. Two or more piston/cylinder units are associated with one another to form multiple piston/cylinder groups. A plurality of control valves combines individual output flows from the two or more associated piston/cylinder units into respective common output flows for each respective piston/cylinder group. A plurality of flow control devices varies the common output flow from each respective piston/cylinder group by throttling inlet flow to the two or more associated piston/cylinder units in each respective piston/cylinder group. Each respective common output flow is directed from each respective piston/cylinder group to a hydraulic actuator on the heavy machinery to control its direction of movement.

A strapping tool and a pump used thereby are disclosed herein. The strapping tool includes a battery-powered motor; a hydraulic assembly operatively coupled to the battery-powered motor; and a sealing assembly, the sealing assembly comprising at least one crimping jaw member, the hydraulic assembly operatively coupling the at least one crimping jaw member to the battery-powered motor, and the at least one crimping jaw member of the sealing assembly configured to crimp or notch a strapping seal member so as to secure a piece of strapping around a package or bundle of items. The pump includes a pump rotor; and a plurality of balls displaced by the pump rotor, the plurality of balls configured to displace a fluid in the pump. The pump contains no linkage members and no piston.

A strapping tool and a pump used thereby are disclosed herein. The strapping tool includes a battery-powered motor; a hydraulic assembly operatively coupled to the battery-powered motor; and a sealing assembly, the sealing assembly comprising at least one crimping jaw member, the hydraulic assembly operatively coupling the at least one crimping jaw member to the battery-powered motor, and the at least one crimping jaw member of the sealing assembly configured to crimp or notch a strapping seal member so as to secure a piece of strapping around a package or bundle of items. The pump includes a pump rotor; and a plurality of balls displaced by the pump rotor, the plurality of balls configured to displace a fluid in the pump. The pump contains no linkage members and no piston.

An oil-free compressor for a rail vehicle includes a compressor housing, a first low pressure piston cylinder supported in the compressor housing, a second low pressure piston cylinder supported in the compressor housing, a first high pressure piston cylinder supported in the compressor housing, a second high pressure piston cylinder supported in the compressor housing, and a crankshaft assembly supported by the compressor housing and linked to pistons of the piston cylinders by respective connecting rods. The first and second low pressure piston cylinders and the first and second high pressure piston cylinders are positioned in an X-shaped configuration around an outer circumference of the compressor housing. The first and second high pressure piston cylinders are configured as first and second lower legs of the X-shaped configuration, and the first and second low pressure piston cylinders are configured as first and second upper legs of the X-shaped configuration.

A variable fluid flow hydraulic pump including one or more displacement bodies having a fixed volume chamber. Within this fixed volume chamber a piston cycles or reciprocates thus providing for the movement of fluid. Also present is a low pressure valve connecting said displacement chamber with the low pressure side. Additionally, a high pressure valve may be provided on the high pressure side. The low pressure valve is provided with an adjustable element or Fcontrol providing an opening force thereon and further providing a closing force, which periodically increases during the pumping stroke and decreases during the suction stroke of said piston reciprocating within the displacement body and further includes an element to supply fluid from the low pressure side to said fixed volume chamber of the displacement body while the pressure in the displacement chamber is less than that of the low pressure side.

A fuel pump for an internal combustion engine is provided comprising a barrel including a central bore having a longitudinal axis, a plunger disposed partially in the central bore and movable along the longitudinal axis, a spring retainer, a first coil spring having a proximal end in contact with a first section of the barrel and a distal end in contact with the spring retainer to urge the spring retainer into engagement with a tappet assembly, an extender element coupled to the plunger, and a second coil spring having a proximal end in contact with a second section of the barrel and a distal end in contact with the extender element to urge the plunger toward the spring retainer, wherein the extender element includes a counter-bore to couple the extender element to the plunger.

A connecting rod for an air compressor includes a rod member, a wrist pin receiving end connected to a first end of the rod member, and a crank pin receiving end connected to a second opposing end of the rod member. A separation line for the connecting rod is provided above the crank pin receiving end. The separation line may be provided between the crank pin receiving end and the rod member. The connecting rod may include a first portion including the rod member and the wrist pin receiving end, and a separate second portion including the crank pin receiving end. The separation line may be provided between the first portion and the second portion.

A hydraulic transmission comprising a variable displacement pump and motor, at least one having cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a valve control module which determines a displacement of the pump and the motor by specifying a displacement demand. The pump and/or motor valve control module determine the frequency of intensity peaks in the frequency spectrum of the pattern of cylinders carrying out active and inactive cycles of cylinder working volume using a first procedure and, if these will fall within disallowed frequency bands including the resonant frequency of components with which the transmission is in mechanical communication, the displacement demand, or another input, is periodically modified to suppress generation of those frequencies. The hydraulic transmission is useful for example in a wind turbine generator, or a vehicle.

A piston rod for pumping paint includes an elongated cylindrical stem and a piston rod cap connected to the cylindrical stem. The cylindrical stem is formed from metal and has an outer diameter that is uniform along most or all of a length of the cylindrical stem. The piston rod cap is cylindrical and formed from metal. The piston rod cap includes an annular top portion that has an outer diameter that is larger than the outer diameter of the cylindrical stem, an annular bottom portion that has an outer diameter that is larger than the outer diameter of the cylindrical stem, and an exterior recess located between the annular top and bottom portions. The recess has an outer diameter that is smaller than the outer diameters of the annular top and bottom portions.

A piston pump has a crankshaft chamber and a plurality of passages extending from the crankshaft chamber. A crankshaft rotatably mounted in the crankshaft chamber has a rotation axis and a plurality of cams distributed along the axis. Each cam has a plurality of noses, all having a nose radius, circumferentially alternating around the axis with a plurality of heels, all having a heel radius that is less than the nose radius, and a cam material abrasion resistance. A plurality of pistons corresponding to the cams and slidably mounted in the passages each have a shaft end. A sacrificial crown removably connected to the shaft end has a cam engagement side and a crown material abrasion resistance that is less than the cam material abrasion resistance. A plurality of resiliently compressible biases bias the pistons to maintain contact between the cam engagement sides and the cams as the crankshaft rotates.