An engine and corresponding driving propulsion system may provide continuous force necessary to keep the engine operating. Utilizing two pressurized tanks with high and low pressures may provide a continuous flow of pressure to the engine necessary for it to operate.

Aspects of the disclosure relate to a hydraulic amplifier. The hydraulic amplifier may include a piston body having a movable piston that divides an interior of the piston body into a first chamber and a second chamber. The piston may include a shaft, and the piston may include a fluid port for filling the first chamber with a first compressible fluid. The hydraulic amplifier may also include a hydraulic body attached to the piston body. The hydraulic body may include a third chamber having a second compressible fluid therein. The shaft may be arranged at least partially in the third chamber. The shaft is configured to compress the second fluid by amplifying a pressure of the first fluid according to a ratio of a cross-sectional area of the first or second chamber to a cross-sectional area of the third chamber.

Provided is a high-efficiency transmission free forging hydraulic press and an operation method thereof. The high-efficiency transmission free forging hydraulic press includes: a hydraulic cylinder, a hydraulic pump, and a pressurization energy storage apparatus. By providing two pressurization energy storage apparatuses between the hydraulic pump and the hydraulic cylinder of the high-efficiency transmission free forging hydraulic press, under the effect of a control system, the two pressurization energy storage apparatuses can alternately provide isobaric pressure oil or pressure oil having undergone pressurization to the hydraulic cylinder of the free forging hydraulic press, such that when the hydraulic pump operates in a status with a relatively low pressure, the hydraulic cylinder in the free forging hydraulic press can constantly obtain the isobaric pressure oil or the pressurization pressure oil, achieving the object of storage of surplus energy and high-efficiency transmission of the hydraulic press.

An inner-circulating high speed hydraulic system, a hydraulic platform and a hydraulic platform assembly consisting of said systems, wherein the inner-circulating high speed hydraulic system comprises a hydraulic cylinder component and a pressure valve component, the hydraulic cylinder component including a high pressure cylinder, a hydraulic plunger, and a housing, wherein an axial hole and radial holes intersecting with the axial hole are disposed at the top/bottom of the high pressure cylinder and the high pressure cylinder is contained within the housing, wherein the inner-circulating oil chamber may communicate with the axial hole via the radial holes and further communicate with chambers at the top/bottom of the hydraulic plunger, wherein compressed air inlets are disposed on the housing and a lower end of the hydraulic plunger is connected to an actuating element; and a pressure valve component, comprising a pressure servo motor and a pressure plunger driven by the pressure servo motor to move up and down within the axial hole disposed at the top/bottom of the high pressure cylinder. Accurate control on dwell time for pressing at the up and down stop points of the platform, and highly precise adjustment to duration of the dwell time are enabled by the present invention. Thus, a stamping process with high quality is achieved.

A pneumatic chamber 20 is configured to include a first pneumatic chamber 21 pressurizing a first piston 11 and a second pneumatic chamber 22 pressurizing a second piston 12. The first pneumatic chamber 21 communicates with the second pneumatic chamber 22. The hydraulic pressure generating unit 55 is internally provided with a hydraulic chamber 30, and the hydraulic chamber 30 is configured to have a first hydraulic chamber 31 pressurized by the first pneumatic chamber 21 via the first piston 11 and a second hydraulic chamber 32 pressurized by the second pneumatic chamber 22 via the second piston 12. The hydraulic pressure generating unit 55 is movable in a thrust direction in a cylinder 2, and the second hydraulic chamber 32 has a function of fixing the moving hydraulic pressure generating unit 55 in the cylinder 2 by causing a thin portion 15 to be elastically deformed in a radial direction due to hydraulic pressure. The first hydraulic chamber 31 outputs hydraulic pressure of the first hydraulic chamber 31, which is increased by the fixing, to an output rod 7.

A pressure-limiting unit for a pressure booster for driving hydraulic tools. The unit includes a pneumatic unit that is driven by gas or air pressure, a hydraulic unit connected to the pneumatic unit and having a hydraulic port for connecting the hydraulic tool to the hydraulic unit in a fluid-tight manner and a pressure-limiting valve for adjusting the hydraulic pressure. The unit includes a closing element pushed against a valve seat by a spring element and having a displaceable adjusting element for adjusting the spring force of the spring element. To provide a pressure-limiting unit and a pressure booster for driving hydraulic tools with a pressure-limiting unit, which offer the possibility of making a precise adjustment of the hydraulic pressure in a simple way, the pressure-limiting unit includes a position detection unit connected to the adjusting element to detect the axial position of the adjusting element, an evaluation unit for determining the set hydraulic pressure as a function of the axial position, and an output unit for displaying the set hydraulic pressure.

A system (100), including: a fluidic actuator (2) which can be acted upon by a pressurized fluid and has an actuator member (3), a pressurized fluid provision device (4) which is adapted to carry out a position control of the actuator member (3) and, within the position control, to apply the pressurized fluid to the fluidic actuator (2) in order to move the actuator (3) into a prescribed position, the pressurized fluid provision device (4) being adapted to carry out the position control taking into account at least one system parameter, which describes a physical property of the system and/or a requirement parameter which defines a requirement for the positioning of the actuator (3), wherein the pressurized fluid provision device (4) is further adapted to perform an assistance procedure and to determine and/or verify, within the assistance procedure, the system parameter and/or the requirement parameter on the basis of a movement of the actuator (3) and/or a consideration of physical limits.

An engine and corresponding driving propulsion system may provide continuous force necessary to keep the engine operating. Utilizing two pressurized tanks with high and low pressures may provide a continuous flow of pressure to the engine necessary for it to operate.

A pneumatic unit for a hydropneumatic pressure booster has a system line that leads from a compressed air inlet to a compressed air outlet. A bypass line runs parallel to the system line and it is connected to the system line via first and second compressed air switches. A compressed air reservoir is connected in the bypass line, and a pressure intensifier is connected in the region between the first compressed air switch and the compressed air reservoir. The pneumatic unit makes available to the pressure booster a sufficiently high pneumatic pressure for carrying out at least one operational step of a connected hydraulic tool, even in the case of a pressure decrease or pressure failure in the supplying pneumatic line. For that purpose, the second compressed air switch is configured for switching the compressed air flow between the system line and the bypass line.

An inner cylinder inside an outer cylinder is disposed to be coaxial to an air pressure supply rod inside the inner cylinder. A first piston is disposed between the air pressure supply rod and the inner cylinder, a pneumatic chamber is disposed on a side of one surface (hydraulic surface) of the first piston in the inner cylinder, and a first hydraulic chamber is disposed on a side of the other surface. A second piston is disposed between the outer cylinder and the inner cylinder, and a second hydraulic chamber is disposed on a side of a surface of the second piston which is provided in the same direction as the hydraulic surface of the first piston in both of the cylinders. The inner cylinder is provided with a communication hole for transmitting a negative pressure along with movement of oil with which the first hydraulic chamber and the second hydraulic chamber are filled. In this configuration, it is possible to shorten an overall length of a fluid pressure cylinder.