摘要:
A hydraulic machine unit that can be operated with various working forces, in which working medium is selectively delivered, via a pump-piston accumulator system, to a main cylinder and at least one driving cylinder, wherein at least for one working stroke a pump system of the pump-piston accumulator system is used to provide working medium to a piston accumulator of the pump-piston accumulator system, and then at least for the working stroke at least the main cylinder is charged with a working pressure from the piston accumulator, and wherein at least for a return stroke the at least one driving cylinder is charged with a return stroke pressure from the pump-piston accumulator system, can be of structurally simple configuration if, at reduced working forces, the working pressure is reduced with respect to the piston accumulator pressure prevailing in the piston accumulator.
摘要:
The invention relates to a screw system for carrying out screwing operations, in particular automatically, with a screwing tool and a feed device having a pneumatic feed cylinder by means of which the screwing tool is movable in a feed direction in order to be brought into engagement with a screw and to drive the latter into components to be screwed together with a first feed force during a screwing operation.
摘要:
The invention relates to an energy-efficient apparatus driven by compressed air and equipped with a dual piston function for tensioning, or clamping, or centering, or punching, or welding, or clinching, for use in body construction in the automotive industry. The apparatus is driven by a pressurized fluid, in particular by compressed air. It is shown how a significant amount of operating costs can be saved while, at the same time, conserving the environment and consuming a low amount of pressurized fluid, in particular compressed air. In addition, the pivoting angle of a toggle joint assembly and thus of an apparatus connected thereto, for example, a tensioning arm of a toggle tensioning apparatus, can be continuously adjusted in both directions while, at the same time, adjusting a sampling device using sensors, for example, microswitches, or inductive switches, or pneumatic switches, or limit switches.
摘要:
A method of operating a dual acting hydraulic cylinder comprising the steps of returning a hydraulic fluid from a rod-side chamber to a piston-side chamber of the cylinder during a start phase of cylinder extraction with a speed component and increasing pressure of the fluid during end phase of cylinder extraction with a booster component and permitting the fluid to flow from the rod-side chamber to a reservoir. A hydraulic device for operating a dual acting hydraulic cylinder comprising a speed component arranged to return a hydraulic fluid from a rod-side chamber to a piston-side chamber of the cylinder at a start phase of cylinder extraction and a booster component arranged to increase the pressure of the fluid at an end phase of cylinder extraction.
摘要:
A vehicle dynamic-body-control actuator includes a fluid-powered-cylinder reservoir tube, a piston, a rod, and a directional lip seal. The reservoir tube has a longitudinal axis and has a first tube end attachable to one of a first vehicle component and a second vehicle component. The piston is positioned within the reservoir tube. The rod has first and second rod end portions, wherein the first rod end portion is attached to the piston and wherein the second rod end portion is attachable to the other of the first and second vehicle components. The directional lip seal surrounds at least one of the rod and the piston, extends to the reservoir tube, and is movable with the rod and the piston.
摘要:
A pressurizing apparatus includes a fixed portion, an input shaft acting directly in an axial direction with respect to the fixed portion, an output shaft extending coaxially with the input shaft to slide with respect to the fixed portion and the input shaft, a direct-connecting mechanism directly connecting the output shaft and the input shaft and causing the input shaft to directly act with respect to the fixed portion to thereby rapidly carry the output shaft with respect to the fixed portion, a fluid pressure mechanism connecting the input shaft and the output shaft in a fluid manner and causing the input shaft to directly act with respect to the output shaft to thereby increase biasing of the input shaft by Pascal's law and transmit the biasing to the output shaft, and a control mechanism actuated by biasing applied by the input shaft to control fluid connection of the input shaft and the output shaft to each other. The control mechanism is directly actuated by biasing of the input shaft applied by the input shaft. Therefore, the apparatus need not include a special actuator for driving the control mechanism and can be formed with a simple structure and at low cost.
摘要:
A servoactuator (20) is operatively arranged to control the movement of an output member (21) in either of two directions in response to a command signal. The servoactuator includes an electric motor (25) having a rotatable output shaft (26); a motor controller (25) arranged to provide a drive current to the motor for controllably rotating the output shaft; a first transmission mechanism (34) operatively arranged to displace the output member in either direction at a nominal first ratio with respect to the motor output shaft; a hydrostatic second transmission mechanism (35) operatively arranged to displace the output member in either direction at a nominal second ratio with respect to the motor output shaft; a transfer mechanism (36) operatively arranged to selectively couple the motor output shaft to the output member either through the first transmission mechanism to impart a high-speed low-force drive to the output member, or through the second transmission mechanism to impart a low-speed high-force drive to the output member; at least one feedback transducer (29, 32) capable of measuring one of the force, displacement or velocity of the output member; and a servo control loop (30, 33) closed about the motor, controller, transmission mechanisms, transfer mechanism, feedback transducer and output member for selectively controlling at least one of the position, velocity or force of the output member as a function of the command signal.
摘要:
The inside of a cylinder is divided into front and rear cylinder chambers, a primary-side piston and a secondary-side piston, each formed by an annular disc part and an annular tube part are fitted into each cylinder chamber, with the annular tube parts of each loosely fitted together, and the secondary-side piston surrounding an operating piston rod so as to hold the operating piston and being fit into the operating piston. The first front cylinder chamber and the second rear cylinder chamber defined by the primary- and secondary-side pistons are connected by a communicating passageway with a relief valve inserted therein, this relief valve being switched to the open condition by either a prescribed pressure or a valve opening/closing bar that is provided upright on the primary-side piston.
摘要:
An oil intensifier cylinder having a hollow cylindrical body. An intensifier piston is slideably positioned in the body. An intensifier rod is connected to and extends from the intensifier piston. An outer reservoir piston is slideably positioned in the body in spaced relationship with the intensifier piston. An inner reservoir piston is slideably positioned in the outer reservoir piston. The inner reservoir piston includes a bore that is disposed to allow the intensifier rod to extend through the inner reservoir piston. An oil reservoir is positioned adjacent the inner and outer reservoir pistons. The oil reservoir is positioned on sides of the inner and outer reservoir pistons that are opposite the intensifier piston. A port is disposed on the end of the oil reservoir that is spaced from the inner and outer reservoir pistons. The port has a shape that slideably and sealingly receives the intensifier rod. A work rod is slideably positioned in the body. The work rod is disposed on the opposite side of the oil reservoir piston. The work rod extends from the body for engaging a work piece.