Abstract: The invention is based on the technical problem of improving the pressing in of large press fittings, said problem being solved by a device for transmitting a mechanical force for driving a pressing device for press fittings, having a storage container (4) for hydraulic fluid, having a pump cylinder (8), having a working cylinder (12), having a first line (14) for connecting the storage container (4) to the pump cylinder (8), having a second line (16) for connecting the pump cylinder (8) to the working cylinder (12), and having a third line (18) for connecting the working cylinder (12) to the storage container (4), wherein means (20) for preventing a return flow into the storage container (4) are provided in the first line (14), wherein means (22) for preventing a return flow into the pump cylinder (8) are provided in the second line (16), wherein switching means (24) for opening and closing the third line (18) are provided, and wherein the swept volume (VA) of the working cylinder (12) is configured to be gr

Abstract: An apparatus for harnessing energy from a wheel travelling on a railroad track includes an elongate body with a plurality of pockets spaced apart along a top surface thereof. Energy collection devices are installed in the pockets, and each includes an actuator extending proud of the top surface. A mounting assembly releasably mounts the body adjacent to the railroad track so that the actuators of the energy collection devices are positioned in a path of the wheel to be actuated thereby. The energy collection devices may be coupled to a low pressure fluid supply reservoir and a high pressure fluid accumulator, and used to pump fluid from the reservoir to the accumulator upon actuation.

Abstract: The invention relates to a vibrating ram arrangement comprising a hydraulic assembly, a vibrator which is connected to the hydraulic assembly via hydraulic tubes, and a controller which is paired with the hydraulic assembly. The hydraulic assembly has a hydraulic pump which is driven by an internal combustion engine, and the vibrator has imbalances and an adjustable hydraulic engine for driving the imbalances. A hydraulic fluid is conducted through the hydraulic assembly, the hydraulic tubes, and the hydraulic engine in a circuit. A frequency sensor for determining the frequency of the vibrator is connected to the controller, and the controller is designed to control a volumetric flow rate conducted through the circuit dependent on the signal of the frequency sensor. According to the invention, the vibrator has a device, which is independent of the controller, for automatically adjusting a displacement volume of the hydraulic engine dependent on a pressure within the circuit.

Abstract: To provide a work machine capable of efficiently regenerating the energy owned by hydraulic fluid during a swing deceleration.

Abstract: A rotation/translation converter gear unit having a helical gear and a planetary gear for driving the helical gear. A spindle nut of the helical gear forms a planet carrier for planet wheels of the planetary gear. Situated between the planetary gear and the helical gear is an axial friction bearing, that at the same time forms a centering element which centers a sun wheel of the planetary gear between the planet wheels. In particular, the rotation/translation converter gear unit is used to drive a piston of a pressure generator for a brake control of a hydraulic vehicle brake system.

Abstract: The invention is based on the technical problem of improving the pressing in of large press fittings, said problem being solved by a device for transmitting a mechanical force for driving a pressing device for press fittings, having a storage container (4) for hydraulic fluid, having a pump cylinder (8), having a working cylinder (12), having a first line (14) for connecting the storage container (4) to the pump cylinder (8), having a second line (16) for connecting the pump cylinder (8) to the working cylinder (12), and having a third line (18) for connecting the working cylinder (12) to the storage container (4), wherein means (20) for preventing a return flow into the storage container (4) are provided in the first line (14), wherein means (22) for preventing a return flow into the pump cylinder (8) are provided in the second line (16), wherein switching means (24) for opening and closing the third line (18) are provided, and wherein the swept volume (VA) of the working cylinder (12) is configured to be gr

Abstract: This invention relates to a wave energy recovery apparatus with an energy transfer arrangement comprising at least a base, a reciprocating panel, a pivot shaft for the reciprocating panel, a control system, and a driving and power-take-off (PTO) arrangement equipped with an actuating mechanism (6), and one or more power-take-off (PTO) units to convert kinetic energy of waves or tidal currents to another type of energy, each PTO unit comprising a hydraulic power transmission mechanism having hydraulic cylinders with pistons inside the hydraulic cylinders. The pistons are fastened with their free ends to the common connecting plate that is arranged to move all the pistons simultaneously inwards into the hydraulic cylinders and to draw all the pistons simultaneously outwards from the hydraulic cylinders.

Abstract: A double cup-shaped piston for a disc brake including an electromechanical parking brake device. An aspect of the invention permits an improved compromise between easier operability, rationalized component logistics in piston production, reduced hydraulic volume uptake in cooperation with the wheel brake periphery, and enhanced fatigue strength under maximum collective stress, in particular for heavy-duty applications of a disc brake with an electromechanical parking brake device. The problem is solved by the presence of a piston wall, which is provided, on the one hand, to sit with a free edge on a rear plate of a friction lining, and wherein the piston, on the other hand, includes an integral dome which forms an open receptacle for an actuator arranged diametrically to the edge of the piston.

Abstract: In exemplary implementations of this invention, a shape controller controls the shape of a bladder as the bladder inflates. The shape controller includes a first set of regions and a second set of regions. The second set of regions is more flexible than the first set of regions. The shape controller is embedded within, or adjacent to, a wall of the bladder. When the bladder is inflated, the overall shape of the bladder bends in areas adjacent to the more flexible regions of the shape controller. For example, the shape controller may comprise paper and the more flexible regions may comprise creases in the paper. Or, for example, the more flexible regions may comprise notches or indentations. In some implementations of this invention, a multi-state shape display changes shape as it inflates, with additional bumps forming as pressure in the display increases.

Abstract: A piston is the driven component within a pump. The piston is driven along a longitudinal axis to pump a fluid through the pump. The fluid flows through the piston between an upstream end of the pump and a downstream end of the pump. The piston outputs the fluid into the downstream end of the pump at a vector offset from the longitudinal axis, thereby inducing rotation of the piston throughout the pumping process. Rotating the piston encourages even wear on various components within the pump, such as sealing rings surrounding the piston, thereby increasing the lifespan of the components and increasing the efficiency of the pump.

Abstract: A peristaltic pump dampener apparatus includes a first chamber and a second chamber separated by a flexible diaphragm. The first chamber of the peristaltic pulse dampener apparatus receives a first input flow tangent to the walls of the first chamber, and the second chamber of the peristaltic pulse dampener apparatus receives a second input flow tangent to the walls of the second chamber. The flexible diaphragm of the peristaltic pulse dampener apparatus acts to equalize the pressure between the first chamber and the second chamber so as to generate two substantially even, constant output flows.

Abstract: A gas-pressure-driven apparatus includes a main body having a working chamber, a movable member moving relative to the main body with a pressure of the working chamber, a pressure sensor for detecting the pressure, a flow rate sensor for detecting the flow rate of the working gas. A method for controlling the apparatus includes calculating a pressure change amount from the detected pressure and an integrated flow rate from the detected flow rate when the pressure is changed in a state in which the volume of the working chamber cannot be changed, calculating an initial volume of the working chamber from the pressure change amount and the integrated flow rate, and calculating a post-change volume of the working chamber from the integrated flow rate and the initial volume after creation of a state in which the volume of the working chamber can be changed from the initial volume.

Abstract: Low-pressure and high-pressure reciprocating and rotary applications use seal assemblies to prevent leakage. One embodiment of a seal assembly includes a major annular body having opposing spaced-apart annular lips extending from a heel portion. The major annular body has a bore extending through the heel portion. A first spring is disposed between the lips, biasing the lips apart. A minor annular body extends from one of the lips of the major annular body. The minor annular body has opposing spaced-apart walls that extend from a base region and form a pocket. A second spring is disposed in the pocket between the spaced-apart walls, biasing the walls apart. During actuator operation, pressurized fluid urges one wall of the minor annular body against a pump head surface to produce a face seal and one of the lips of the major annular body against a rod surface to produce a radial seal.

Abstract: A rotatory energy recycling control device for a hydraulic excavator, comprising: an oil line selector valve (1), a direction selector valve (2), a sequencing valve (3), a one-way valve (4) and an overflow valve (5); two oil inlets of the oil line selector valve (1) are respectively connected to an opening A and an opening B of a rotary motor; an oil outlet of the oil line selector valve (1) is connected to an inlet of the direction selector valve (2); an outlet of the direction selector valve (2) is connected to an net of the sequencing valve (3); a drainage port of the sequencing valve (3) is connected to an oil tank; an outlet of the sequencing valve (3) and an net of the one-way valve (4) communicate with the overflow valve (5): the outlet of the one-way valve (4) is connected to an energy storage and utilization device; and an outlet of the overflow valve (5) is connected to the oil tank.

Abstract: A fuel pump includes a housing provided with an axial bore defining a compression chamber. The pump is further provided with a cylindrical piston slidably arranged in the bore, the piston extending from a top extremity that is inside the bore, defining a high pressure extremity, to a lower extremity, defining a low pressure extremity. The piston is able to reciprocally slide between a lower position where fuel at low pressure enters the compression chamber via an inlet and, a top position where fuel present in the compression chamber is pressurized before being expelled via an outlet. The piston is also provided with a recess surrounded by a peripheral wall arranged on its high pressure extremity, the recess and peripheral wall enabling the piston to expand radially when fuel in the compression chamber is pressurized.

Abstract: A vehicle-height control system includes: a fluid supply and discharge device including a compressor configured to suck fluid, and a tank configured to supply the fluid; an actuator-side passage connected to the fluid supply and discharge device; a vehicle-height control actuator provided for a wheel and connected to the actuator-side passage via a vehicle-height control valve; and a vehicle height controller configured to control a vehicle height for the wheel by controlling the fluid supply and discharge device and the vehicle-height control valve to control supply and discharge of the fluid in the vehicle-height control actuator. The vehicle height controller includes a start controller configured to open the vehicle-height control valve after establishing communication between the actuator-side passage and at least one of the tank and the compressor in a state in which the vehicle-height control valve is closed at a start of control of the vehicle height.

Abstract: A hydraulic drive system for a track device of crawler type has right and left hydraulic track motors. The hydraulic drive system is capable of correcting for skew occurring in the straight line traveling of the track device. A traveling test is conducted upon shipment from a factory. If skew is noted during the test, a plug disposed on the side of a valve opening-side pressure receiving portion of a pressure compensating valve for the track which is lower in speed is removed and, replaced with an adjusting mechanism-mounted plug having an adjusting pin. The pin is operated so as to strengthen a biasing force of a target compensating differential pressure adjusting spring. An opening in the pressure compensating valve is thereby corrected in an opening direction and a flow rate to one of the left and right track motors is thereby adjusted to be equal to the other motor.

Abstract: The invention relates to a master cylinder for an actuating device of a clutch or a brake of a motor vehicle, including a cylinder housing having a pressure cylinder section, as well as a piston mounted movable relative to the cylinder housing, wherein the piston is arranged inside the pressure cylinder section in an actuation state in order to control a fluid pressure in a fluidically sealed pressure chamber by a sealing device on the piston side, and is arranged in a pressureless state such that the pressure cylinder section is fluidically connected to a retention system, wherein a seal of the sealing device is configured, and attached to the piston, such that it rests on a seal protection area of a stop element at least in a parking position in the pressureless state; as well as a method for mounting such a master cylinder.

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: The object of the present invention is to provide a fluid rotary machine in which dead spaces can be reduced as much as possible even if the machine is enlarged by arranging rotary valves directly behind cylinder chambers. The fluid rotary machine in which first and second double-headed pistons (7, 8) intersecting within a case body (1, 2) move linearly back and forth within cylinders (16) due to the hypocycloid principle along with rotation of shafts (4a, 4b) and in which intake and exhaust cycles are repeated in chambers (22), wherein cylinder heads (17) for closing the cylinder chambers (22) are each provided with rotary valves (19) which are rotated by drive transmission from the shafts (4a, 4b) and which are provided with intake holes and discharge holes (19b) alternately communicated with the cylinder chambers (22) via communication channels (20a, 20b), and the rotary valves (19) intersect longitudinal axis of the opposing pistons (7, 8) and are capable of rotating parallel with output axil lines.